24Kv Secogear: Metal-Clad Switchgear Instruction Manual
24Kv Secogear: Metal-Clad Switchgear Instruction Manual
24Kv Secogear: Metal-Clad Switchgear Instruction Manual
1
Your safety first – at all times!
This is why our instruction manual begins with the following recommendations:
Only install switchgear and/or switchboards in closed rooms suitable for electrical equipment.
Ensure that installation, operation and maintenance are carried out by specialist electricians only.
Fully comply with the legally recognized standards (IEC), the connection conditions of the local electrical
utility and the applicable safety at work regulations.
Observe the relevant information in the instruction manual for all actions involving switchgear and
switchboards.
Danger!
Pay special attention to the hazard notes in the instruction manual marked with this warning symbol.
Make sure that the specified data are not exceeded under switchgear or switchboard operating
conditions.
Keep the instruction manual accessible to all personnel involved in installation, operation and maintenance.
The user’s personnel must act responsibly in all matters affecting safety at work and correct handling of the
switchgear.
WARNING
Always follow the instruction manual and respect the rules
of good engineering practice!
Hazardous voltage
can cause electrical shocks and burns.
Disconnect power, then earth and short-circuit before proceeding
with any work on this equipment.
If you have any further questions about this instruction manual, the members of our field organization will be
pleased to provide the required information.
We reserve all rights to this publication. Misuse, and including in particular, duplication and making this
manual - or extracts thereof available to third parties is prohibited. We do not accept any responsibility for
the information provided, which is subject to alternation.
6.3 Service trucks ......................................................... 39
Contents Pag e
1 Summary .................................................................. 4 7 Maintenance ........................................................... 49
1.1 General ...................................................................... 4 7.1 General ................................................................... 49
1.2 Standards and specifications ..................................... 4 7.1.1 Intervals for inspection, servicing and repairs .......... 49
1.3 Operating conditions .................................................. 4
1.3.1 Normal operating conditions ...................................... 4 7.2 Inspection ................................................................ 50
1.3.2 Special operating conditions ...................................... 4 7.3 Servicing ................................................................. 50
7.4 Repair ..................................................................... 51
2 Technical data .......................................................... 5 7.4.1 Switchgear in general .............................................. 51
2.1 Main parameters for panels with circuit breakers ....... 5 7.4.2 Replacement of complex functional groups ............. 52
2.2 Resistance to internal arc faults ................................. 5 7.5 Spare parts, auxiliary materials, lubricants .............. 53
2.3 Dimensions and weights ............................................ 5 7.5.1 Spare parts .............................................................. 53
7.5.2 Auxiliary materials, lubricants .................................. 53
3 Panel design and equipment .................................. 6
3.1 Basic structure and variants ...................................... 6 8 Product quality and environmental
3.2 Enclosure and partitioning ......................................... 6 protection ............................................................... 54
3.2.1 Ventilation of the panels ............................................. 7
3.3 Compartments in the panels ...................................... 7
3.3.1 Busbar compartment .................................................. 7
3.3.2 Circuit-breaker compartment ...................................... 8
3.3.3 Withdrawable parts .................................................... 8
3.3.4 Cable connection compartment ................................. 9
3.3.5 Control cabinet ........................................................... 9
3.4 Interlock/protection against erroneous operation......... 9
3.4.1 Panel internal interlocking .......................................... 9
3.4.2 Doors interlocking .................................................... 10
3.4.3 Interlocks between panels ........................................ 10
3.4.4 Locking devices ........................................................ 10
3.5 Cross sections of 24 kV panel variants .................... 11
Details of the technical design and configuration of individual switchgears, such as the technical
data, detailed equipment lists for the individual panels and comprehensive circuit documentation
etc., can be found in the relevant order documents.
For correct usage of the product, please read this manual carefully. It is always advisable to
use the manual for all operations regarding installation, putting into service, operation and
maintenance of SecoGear air-insulated switchgear to be carried out by specialized personnel
4
Note on any special climatic operating conditions:
When switchgears are operated in areas with high humidity and/or major rapid temperature
fluctuations, there is a risk of dew deposits which must remain an exception in normal operating
conditions for indoor switchgear. Preventive action (e.g. fitting electric heaters) must be taken
in consultation with the manufacturer to avoid this condensation phenomenon and any
resulting corrosion or other adverse effects. The control of the heaters depends on the relevant
project and details must be taken from the order documents.
1VLM000363-Rev5, en - 5/106
2. Technical data
2.1 Main parameters for panels with circuit breakers
Rated voltage kV 24
Rated frequency Hz 50
1)
Rated peak withstand current kA 50/63
1) The short-circuit withstand capacity of the instrument transformers must be taken into account separately.
For individual switching device data, see the instruction manual for the relative switching device, as listed
under 7.1.
6
Dimensions and weights of 24 kV units
Dimension mm
Height A 2250
Width
the rated current of branch:1250A
B 800
Depth C 1500
A Kg
...1250 1000-1050
1600 1200
2000 1200
1200
2500
For busbar sectionalizing, two panels are necessary, the coupling panel with the withdrawable
circuit-breaker part and a bus riser panel (optional with busbar metering and earthing). In equipment
without busbar sectionalizing, a direct bar connection between the busbars will be established.
Further details about installation and switchgear equipment can be obtained from the documents of
relevant order.
The rear wall of the busbars of busbar compartment 84, intermediate wall 9, mounting plate 12 with
shutters 12.1/1 2.2 and horizontal partition 20, form part of the internal partitioning.
The internal partitioning makes safe access to the circuit-breaker and cable compartments possible
even when the busbars are live.
The low voltage compartment for the secondary equipment is completely protected from the high voltage
area thanks to its steel-sheet casing.
On the end sides, cover plates ensure good appearance and are mechanically and thermally arc fault
proof should such an event occur in the end panel.
Doors and rear walls as well as the cover plates are thoroughly cleaned and treated against corrosion
before receiving a high quality double coating of paint. The finishing coat is in the standard RAL 7035
colour (special colours by agreement). Stoving completes the procedure and provides considerable
insensitivity to impact and corrosion.
The circuit-breaker compartment and cable connection compartment doors are pressure resistant
and can either be fitted with screws or manual closing systems. (central handle)
In cases of higher ambient temperature (>40°C) it may be necessary to install a fan in the horizontal
partition. This is not standard. Please refer to figure 6/15 and 6/16.
Busbars and branch conductors are insulated by means of shrink-on sleeves. The bolt connections in
busbar systems are covered by insulating covers 58.
By means of bushing plates 28 and busbar bushings 29, partitions can be created between panels.
These partitions are necessary for higher rated short-time currents – see the following table.
1) In these panels, busbar bushings 29 and bushing plates 28 need not be mounted - the dynamic strength of the
busbar system is sufficient.
According to customer requirements, this separation into individual panels by means of busbar bushings
29 and bushing plates 28 can also be provided in switchgear panels .Top-mounted boxes with busbar
earthing switches, or busbar voltage transformers can be placed above the units. For details, see
chapter 5.5.
8
3.3.2 Circuit-breaker compartment (Figures 3/1,5/11, 6/17)
The circuit-breaker compartment is isolated from all other compartments and equipped with shutter
mechanism, racking mechanism, padlocking for shutter, auxiliary and control wiring socket.
Spout bushing on which tulip contacts from breaker gets connected are mounted on mounting
bracket 12. The metal shutters 12.1/12.2, covering the insertion openings, are also included. The
shutters are opened by means of actuating bars 13.16 of the withdrawable circuit-breaker part, using
lever 38 when inserting into the service position, and are closed when the latter is removed. In the
test/disconnected position of the withdrawable part, partitioning by separation is established in the
main current circuit. Connection of the control wiring, required for test purposes, need not be
interrupted when in the test/ disconnected position.
In the test/disconnected position, the breaker remains completely inside the panel with the door closed.
The ON/OFF pushbutton located on the circuit-breaker, and the mechanical indicators for ON/ OFF and
CHARGED/DISCHARGED can be observed through an inspection window. when circuit breaker is in
service position.
The switching operations are carried out with the doors closed. Installation of an additional mechanical
switching device for manual operation of the circuit-breaker in the service position is also possible.
The socket 10.1 for the control wiring is mounted fixed in the circuit-breaker compartment.
The withdrawable assembly 13.15 and the circuit-breaker are coupled via a multi-pole control wiring
plug connector 10.3.
The withdrawable assembly establishes the mechanical connection between the panel and the
circuit-breaker. The fixed part is connected to the panel by forking, which is form coded on both sides.
The moving part with the circuit-breaker is moved manually by means of a spindle, between the
service or test/disconnected positions with the front doors closed. Service and test disconnected
positions are set precisely by means of auxiliary switches, which register the final position reached and
the angular position of the spindle.
The earthing connection between the withdrawable part and the panel is established by its rollers and
travel rails 42, which are bolted onto the panel.
Withdrawable parts of the same design are interchangeable. In the case where the withdrawable parts
have the same dimensions, but different circuit-breaker fittings, the control wiring plug coding prevents
any erroneous connections between the withdrawable part and the panel. The coding is indicated in
the order documents.
The cable compartment is constructed for installation of three current transformers. Should all three
current transformers not be required, dummies will be installed in their place, using the same
installation and connection procedures.
The voltage transformers mounted fixed are connected on the primary side with flexible, fully-
insulated cables which are inserted into the transformers.
9 1VLM000363-Rev5, en - 9/106
The removable voltage transformers are fitted with HRC fuses.
The ESW type earthing switch can be used with either a manual mechanism. Its switching position
will be indicated both mechanically by indication on the shaft and electrically by means of the
auxiliary switch.
In place of one cable termination surge arrestors can be connected mounted fixed on the panel.
Cable connection:
In the 800 mm wide panel, up to three parallel Xlpe cables can be connected with single-core cable
protection and push-on sealing ends with a maximum cross-section of 500 mm2.
In the 1000 mm wide panel, up to six parallel plastic cables can be connected with single-core cable
protection and push-on sealing ends with a maximum cross-section of 500 mm2.
The height of the control cabinet is 580/705/1100 mm. For details, see chapter 2.3.
If the secondary devices are not intended for door installation, they are mounted on DIN RAILS. This
enables any subsequent changes to the wiring. In the lower part of the control cabinet, there are
three rows of DIN RAILS on the swiveling DIN RAIL holder and, below these, there is an easily
accessible auxiliary switch for the control wiring plug.
Secondary wiring inside the panel is in a duct on the right side of the panel. The left side of the panel
is for the external wiring. The ducts are covered with steel sheet metal 43.1, 43.2. There are holes for
sliding in the ring conductors at the side of the control cabinet.
To prevent hazardous situations and erroneous operation, there is a series of interlocks to protect
both personnel and equipment:
The Vacuum circuit breaker can only be moved from the test/disconnected position (and back)
when the circuit-breaker and earthing switch are off (i.e. the switch must be off beforehand.) In
the intermediate position, the switch is mechanically interlocked. The electrical interlock can be
provided with circuit breaker having electrical release.
The circuit-breaker can only be switched on when the withdrawable part is in the test or service
position. In the intermediate position, the switch is mechanically interlocked. When the
circuit-breakers have an electrical release, the interlock is also electrical.
In panels with digital control technology, prevention of malfunction of the switch can also be
achieved by means of the control terminal.
In the service or test positions, the circuit-breaker can only be switched off manually when no
control voltage is applied and it cannot be closed (electromechanical interlock).
Connecting and disconnecting the control wiring plug 10.2 is only possible in the
test/disconnected position of the withdrawable part.
The earthing switch 6 can only be switched on if the vacuum circuit breaker is in the
test/disconnected position or outside of the panel (mechanical interlock 1) ).
If the earthing switch is on, the vacuum circuit breaker part cannot be moved from the
test/disconnected position to the service position (mechanical interlock).
Details of other possible interlocks, e.g. in connection with a locking magnet on the
withdrawable part and/or earthing switch drive, can be obtained from the relevant order
documents.
10
3.4.2 Doors interlocking
The panels can be equipped with the following door interlocks (all optional):
The circuit breaker compartment door cannot be opened if the circuit-breaker is in service or in
an undefined position.
The earthing switch cannot be operated if the cable compartment door is open.
The cable compartment door cannot be opened if the earthing switch is open.
Note: When the interlocking for circuit breaker is used then is necessary to use OFF push button on
door to provide emergency switching OFF.
The busbar earthing switch can only be closed when all the withdrawable parts in the relative
bus-bar section are in the test/disconnected position (electromechanical 2) interlock).
When the busbar earthing switch is closed, the vacuum circuit breaker in the earthed busbar
section cannot be moved from the test/disconnected position to the service position
(electromechanical interlock).
The shutters 12.1/12.2 can be secured independently of each other with padlocks when the
withdrawable circuit-breaker has been removed.
Access to the operating-shaft 14.1 of the earthing switch can be restricted with a padlock.
Access to the circuit-breaker compartment and the cable compartment can be restricted with a
padlock.
11 1VLM000363-Rev5, en - 11/106
3.5 Cross sections of 24 kV panel variants
12
Figure 3/2-1: Feeder unit 24 kV, 1250 A, 25 kA Figure 3/2-2:feeder unite 24kV,2000A,25kA with removable transformer
Figure 3/2-3: Feeder unit 24 kV, 1250 A, 25 kA, with top- Figure 3/2-4: Feeder unit 24 kV, 1250 A, 25 kA, with top-
mounted busbar voltage transformers mounted busbar earthing switch
1VLM000363-Rev5, en - 13/106
14/106 - 1 VLM000363-Rev5, en
4. Dispatch and storage
At the time of dispatch, the SecoGear panels are factory-assembled, the withdrawable parts are
in the service position and the doors are closed.
The factory-assembled panels are checked at the works for completeness in terms of the order
and simultaneously subjected to routine testing (normally without AC voltage testing of the busbars)
to IEC 62271-200:2003, and are therefore tested for correct structure and function.
The busbars are not assembled. The busbar material, fasteners and accessories are packed
separately.
4.2 Packing
According to the kind of transport and country of destination, the panels packing may change it
may remain unpacked or wrapped in foil and packed in seaworthy crates. A drying agent is
provided to protect them against moisture:
Panels with basic packing or without packing.
Panels with seaworthy or similar packing (including packing for containerized shipments):
- Sealed in polyethylene sheeting
- Transport drying agent bags included
- Moisture indicator included
Observe the directions for use of the drying agent bags. The following applies:
- Coloured indicator blue: contents dry
- Coloured indicator pink: contents moist (relative humidity above 40%).
4.4 Delivery
The responsibilities of the consignee when the switchgear arrives at site include, but are not limited
to, the following:
Checking the consignment for completeness and lack of any damage (e.g. also for moisture
and its detrimental effects). In case of doubt, the packing must be opened and then properly
resealed, putting in new drying agent bags, when intermediate storage is necessary.
If any quantities are short, or defects or transport damage are noted, these must be:
No t e:
Always take photographs to document any major damage.
1 VLM000363-Rev5, en - 15/106
4.5 Intermediate storage
Optimum intermediate storage, where it is necessary, without any negative consequences depends on
compliance with a number of minimum conditions for the panels and assembly materials.
1. Panels with basic packing or without packing:
A dry well-ventilated store room with a climate in accordance with IEC 60694.
The room temperature must not fall below –5 °C.
There must not be any other negative environmental influences.
Store the panels upright.
Do not stack panels.
Panels with basic packing:
- Open the packing, at least partially.
Panels without packing:
- Loosely cover with protective sheeting.
- Ensure that there is sufficient air circulation.
Check regularly for any condensation until installation.
W a r ni n g:
Do not walk on the roof of the panels (rupture points in pressure relief devices!).
The pressure relief devices could be damaged!
16/106 - 1 VLM000363-Rev5, en
5. Assembly of the switchgear at site
In order to obtain an optimum installation sequence and ensure high quality standards, site installation of
the switchgear should only be carried out by specially trained and skilled personnel, or GE approved
skilled personnel.
Rated voltage kV 24 kV
Panel width
FT mm 800 1000
17
The general foundation drawing is given in the figures 5/1 according to parameters of units.
The base irons of “C" profile shape can be supplied by GE manufacturer together with the
switchgear. Their installation is usually carried out by site personnel and should, if possible, be
performed under supervision of a GE specialist. The base irons must be installed in the slab before
finishing the floor:
Rest the irons in the specified position on the concrete floor as shown in the relevant foundation
drawing and mark out holes for drilling in the place of prepared holes. Then drill the holes for anchoring
bolts i.e. for plugs 14 for fixing of base irons in the floor. Then put the plugs in holes and attach the
base irons to the floor slightly with the bolts 13 without end tightening to make possible the required
leveling.
Carefully level base irons both longitudinally and transversally over the entire length and to the
correct height by putting under strips of suitable thickness using a leveling instrument.
5.2.2 Method of installation B – Fixing with anchoring bolts to concrete floor (Figure 5/5-1):
The general foundation drawing is given in the figures 5/3, 5/4 according to parameters of units.
Clean carefully the installation area of switchgear
On the slab, according to the relevant outline drawing take the minimum wall and obstacle
clearances into account.
Level the floor both longitudinally and transversally; evenness tolerance is± 1 mm within a measuring
length of 1 m.
Drill the floor at the foreseen fixing points, referring to the slab drilling drawings. To make the holes,
use a hammer drill with the bit according to used steel plugs.
Insert the plugs in the holes and on the traced perimeters of units put the individual panels creating
switchgear.
Level the units and then bolt them together in the front and rear part.
Fix the units with bolts with special washers (The coupling material is supplied by request).
In the case of metal floor use the attachment according to the figure (Figure 5/5-3 or 5/5-4)
To make the holes, use a drill with a suitable bit for the type of fixing to be made (through or threaded
hole).
18
The general foundation drawing is given in the figure 5/6 according to parameters of units.
In most cases the flouting floor is created by steel structure in which the welded steel frame is installed. It
is used the frame produced from suitable steel profiles. GE does not supply this frame.
Clean the installation area.
After installation of frame make necessary measures for perfect earthing of frame with galvanized
steel strips of dimensions min. 30 x 4 mm. Two earthing connections are recommended for the panel
row longer as approx. 5 panels.
Put units on the frame according to the relevant foundation drawings, taking the minimum wall and
obstacle clearances into account.
Level the units and then bolt them together in the front and rear part.
Carry out the attachment by welding of outside panels to the steel floor frame in the place where the
frame exceeds the switchgear bottom, this means on the outside lateral walls of units row. This method
of installation is not recommended if the seismic resistance is required.
In the case of metal floor use the attachment according to the figure (Figure 5/5-3 or 5/5-4) To make
the holes, use a drill with a suitable bit for the type of fixing to be made (through or threaded hole).
M6 10.5 4.5
M8 26 10
M10 44,1 20
M12 74,6 40
M16 165 80
1) The rated tightening torques for fasteners without lubrication are based on a coefficient of friction for the thread of 0.14
(the actual values are subject to an unavoidable range, in part not inconsiderable).
2) Rated tightening torques for fasteners with lubrication in accordance with DIN 43 673 Standard .
3) Thread and head contact surface lubricated.
Any tightening torques that deviate from those in the general table (e.g. for contact systems or device
terminals) must be taken into account as stated in the detailed technical documentation.
It is recommended that the threads and head contact surfaces of bolts should be lightly oiled or greased,
so as to achieve a precise rated tightening torque.
The individual installation stages are as follows:
Remove withdrawable parts 13 from the switchgear panels and store them with suitable protection.
Dismantle lifting eyebolts 1.5.
Transport the switchgear panels to the prepared installation point following the sequence shown on
the switchgear plan.
Remove vertical partitions 9 in front of the busbar compartments by releasing the fixing screws.
Release the fixing screws and draw out horizontal partition 20 below the withdrawable part travel rails.
Release and remove floor cover 17.
Remove covers 43.2 and 43.3 from the vertical control wiring ducts at the front right and left of the
panel.
If any top-mounted enclosures with busbar earthing switches or instrument transformers have been
removed for transport, bolt these in place in the specified position where the rear and middle pressure
relief plates would otherwise be located on the switchgear panels, and make the internal connections
again. (Figures 5/17 to 5/20).
Fit and screw the separate mechanism enclosures for any top-mounted earthing switches in the
specified position on the low voltage compartment with the front edge flush.
Note the correct positions of the parts fitted on the hexagonal drive shaft supplied loose, and then
remove the parts from the shaft, discarding the rubber ring at the front.
Insert the drive shaft step by step at the front of the mechanism enclosure until it is completely fitted,
19
threading on the individual parts in the correct positions for the open position of the earthing switch.
Secure the setting rings. Adjust the mounting positions and operating moments of the auxiliary switches:
1. Adjust the positions of the auxiliary limit position switches in their slots in such a way that there is a
run-on of 0.5 mm in the fully operated position before the plunger reaches the stop (for safety
reasons).
2. The auxiliary limit position switch 78.4 for earthing switch ON must operate immediately after the
dead centre position of the toggle spring mechanism is reached in the closing process and the
automatic quick-closing process has started.
3. The auxiliary limit position switch 78.5 for earthing switch OFF must be operate during the opening
movement of the slide (78.2) 1 mm before the tab of the slide makes contact with the armature of
the de-energised locking magnet 78.6.
When the switchgear has been properly assembled, fix the panels to the concrete floor using plugs,
or weld or adequately bolt them to the foundation frame.
5.4 Installation of the busbars and bushings (Figures 3/1, 5/13 to 5/18)
Access to busbars is possible either from above after dismounting of the pressure relief plate 1.1 (fig.
3/1), or from the front of the circuit breaker compartment. After circuit breaker 13 has been withdrawn
and horizontal partition 20 dismounted, partition 9 can be dismantled, which makes access to busbars
from the circuit breaker compartment possible.
Install bushings 29 (for switchgears with busbar barriers only).
Clean the insulation on the busbar sections with a soft, dry cloth, and check for insulation damage.
Remove greasy or adhesive dirt as described in section 7.3.
Busbar connections:
– The silver plated surfaces of the connections must be cleaned with a metal-free non-woven cleaning
cloth and thinly and evenly coat with Isoflex Topas NB 52 grease.
– The non-silver plated surfaces of the connections are either brushed with a wire brush, preserving
the grease film, or cleaned with a metal-free non-woven cleaning cloth and evenly greased with a thin
coat of Isoflex Topas NB 52.
Prepare insulating covers 58 and lids 58.5 to suit the relevant busbar connections and thread them
onto the busbar. (For insulated busbars only).
Install the busbars panel by panel. Screw on the individual busbar elements one above the other
(depending on the system layout) and in line with the flat branch conductor. Use the hexagonal socket
head screws 163 provided. See the table above for the tightening torque. Use two dished washers for
each screw.
Bolt one holder 58.1 to each end of the busbars to support insulating cover 58. The screws for holder
58.1 must be tightened with a lower torque. (For insulated busbars only).
Position insulating covers 58 and lids 58.5 over the relevant bolted joint, and slide the lid onto the cover
until it clicks into place. (For insulated busbars only).
Note:
The connection of busbars is carried out with so called “stabilized connections”. This means that quality of
the copper busbar connections does not change depending on the operating time and therefore it is not
necessary to inspect tightness of busbar connections regularly. But this is on condition that correct
assembly is carried out as described above and especially that all connections are tightened with the
prescribed torque according to the table in sect. 5.3.
We recommend only inspecting tightness of busbar connections during repairs - see sect. 7.4.1.
20
5.4.1 Busbars and bushings (Figures 5/13 to 5/18)
Busbars and branches are made of copper and both have a flat cross-section. Bushings for each phase
has an electrode inside, which must be connected to the busbar. Busbars for 24 kV units are insulated
by means of shrink sleeve and the connection points are covered by insulating covers.
Insert bushing 29 for the lower busbar into bushing plate 28 from the right side, and the middle and upper
one from the left side (see Fig. 5/13).
Important note:
Always check that there is good contact between the metal tube in the bushing and the
busbar via contact spring 29.3. Ensure that the contact spring is in the correct position!
(See Fig. 5/16).
For transport reasons, attachments to the panels are not completed at our works. As far as possible
however, they are pre-mounted.
- In panels without busbar bushing plate 28, the partition between the busbar compartment and the
top-mounted box is necessary. They are installed at the works in the top-mounted box.
- As far as equipment with busbar partitioning is concerned (i.e. with bushing plate 28), the space
between the busbar compartment and the top-mounted box must remain open for purposes of pressure
relief.
Connecting bars 2.2 with branch conductors 2 at the junction point must be screwed together according
to figures 5/18. However, if necessary, the additional spacer plate 3.2 or 3.3 and threaded plate 3.4 or 3.8,
as well as the screw fixing material from the “top-mounted box for metering” set of bags must be used.
Intermediate box 79.1, with the screw fixing material from the “top-mounted box for metering” set of
bags must be mounted on the control cabinet. Conduction tube 79.2 must be positioned and inserted in
reducer rings 79.3.
Secondary circuits from the voltage transformers must be led to the terminal strips and connected
according to the cable core markings and circuit diagram.
1 VLM000363-Rev5, en - 21/106
5.5.2 Earthing switch for busbar earthing (Figures 5/18, 5/19 ,5/20)
Top-mounted box 77 must be mounted on the busbar compartment using screw fixing
material from the “top-mounted box for earthing” set of bags.
Operating mechanism box 78 must be mounted on the control cabinet with screw fixing
material from the “top-mounted box for earthing” set of bags.
Pre-mounted single parts of hexagonal shaft 78.1 must be removed. Please pay attention to
the sequence and angling of the parts!
Hexagonal shaft from the operating mechanism box must be pushed through into the bevel
gear of the earthing switch.
Sequence and angles of the part must be restored!
Connecting bars 2.2 with the branch conductors 2 at the junction point must be screwed
together according to figure 5/18. However, if necessary, additional spacer plate 3.3 or 3.2
and threaded plate 3.4 or 3.8, as well as the screw fixing material from the “top-mounted box
for earthing” set of bags must be used.
Insulating cover 58 must be brought into position as described in section 5.4.
Note:
The auxiliary switches for the earthing switch are adjusted at the works. Problem-free operation is
only guaranteed if the working elements on the hexagonal shaft are correctly mounted.
Because of final installation of the earthing switch and operating mechanism on site, it may be
necessary to make precise adjustment of the auxiliary switches. In that case, the following is
important:
The auxiliary switch OFF 78.5 must be operated:
- before slide 78.2 has uncovered half of the opening in front of the hexagonal shaft and
- before the lower edge of the slide has touched the anchor of locking magnet 78.6.
The auxiliary switch ON 78.4 must be operated
- before the toggle spring of the earthing switch has reached its dead centre point.
The push-rod of the auxiliary switch must still have about 0.5 mm to go to the end position in
the operated position.
Note:
The rear pressure relief flap must be mounted according to figure 5/8.
Details regarding connection to the wall and a discharge grating for pressure relief outside the
switchroom will be agreed on with the customer.
The standard method for entry of power cables in the switchgear is shown in Fig. 5/9 and 5/10.
The cables are conveyed from below through floor covering 17, which is divided at the cable entry
point. The cables go through rubber reducer rings 17.2, which can be adapted to the required
cable diameter in a range from 27 to 62 mm. Cables are fastened in the panel by means of cable
clamps mounted on cable strips, which are part of the panel floor covering. The clamps make it
possible to fasten cables with diameters between 35 and 54 mm.
22/106 - 1 VLM000363-Rev5, en
Cable sealing ends are mounted on the cable cores according to the manufacturer’s instructions. It
is possible to use cable sealing ends of different manufactures (e.g. Pirelli, Raychem etc.), but it is
necessary to keep the length of the cable ends, including cable sealing ends, which is given by
the distance of cable connecting bars 23 from the panel floor covering. These bars have different
versions, which differ in their number of parallel cables and the values of rated and short-circuit
currents.
The bars are equipped with holes for M16 screws. If M12 screws are used for cable connections,
special washers with the diameter for M12 screws are supplied. In all cases, the earthing of cable
screens is carried out on the strip-holding cable clamps. The cable strip is connected to the earth
potential.
It is also possible to place the removable arrangement of voltage transformers in the cable
compartment. These can be fitted with HV fuses similar to those in the measuring panel. Three
fixed mounted surge arresters can also be installed here. But in both these cases the number of
parallel cables must be reduced – see the table.
24 800 3 1) 500
35 - 54 27 - 62
1000 6 2)
1) In the case where there are removable voltage transformers on the truck, or surge arresters are used, the number of parallel
cables is reduced to a max. of 2 per phase.
2) In the case where there are removable voltage transformers on the truck, or surge arresters are used, the number of parallel
cables is reduced to a max. of 4 per phase.
Max.
Rated Panel Max. number Range of Range of
cross
section
voltage width of parallel cable clamp reducer ring
of
(kV) (mm ) cables cables (mm) (mm)
2
in phase (mm )
24 1000
1 240 35 - 54 27 - 62
Important notice:
Connection with single-core plastic insulated cables is presumed in the typical panels. In the case of
any atypical cable connections or of special cables (e.g. three-core cables, cables with paper or
special insulation etc.), an agreement must be reached between the customer and manufacturer.
1 VLM000363-Rev5, en - 23/106
5.7.2 Control cables (Figures 3/1, 5/11)
The control cables are conveyed into the panel through the control wiring duct 1.2 on the left-hand
panel side.
Mounting procedure:
Insert the cables into the control wiring duct 1.2 on the left-hand side (Fig. 3/1). The duct is
covered by covers 43.1, 43.2 (Fig. 5/11).
Fasten the control cables at the top end of the duct, strip the insulation and convey cable control
cores into the low voltage compartment D, after the terminal strip frame has been swung up
(Fig. 5/21).
Connect control cables to the terminal strip according to the circuit diagram.
Make the control wiring connections to adjacent panels using bushing 24 (Fig. 5/6).
24/106 - 1 VLM000363-Rev5, en
5.11 Floor drawings
C Panel depth with circuit breaker SecoVac 24 including combination with them is C = 1560 mm, in other
cases C = 1520 mm – however always consider annotation 2)
G Width of operating aisle
FT Panel width
TB Door width = FT + 200 mm
TH Door height = panel height + 200 mm
1) Min. dimensions
2) Dimension must be verified in documentation of the relevant order
10 Door
11 Rear cover
12 Side end cover
13 Screw
14 Steel dowel
1 VLM000363-Rev5, en - 25/106
Figure 5/2: Example of 24 kV switchgear on foundation frame on concrete floor.
Panel with pressure relief to the outside.
Obr. 5/3-1: 24 kV – 800 mm wide units Obr. 5/3-2: 24 kV – 800 mm wide units
– anchoring bolt fixing system - base iron fixing system
26/106 - 1 VLM000363-Rev5, en
Additional details for proparation of footprint – It is not valid for the panels with Switch-disconnector
Obr. 5/4-1: 24 kV – 1000 mm wide units Obr. 5/4-2: 24 kV –1000 mm wide units
– anchoring bolt fixing system
590 105
– base iron fixing system
800
Figure 5/5-1: anchoring bolts on concrete floor Figure 5/5-2: base irons on concrete floor
Figure 5/5-3: through hole on metal structure Figure 5/5-4: threaded hole on metal structure
27
View
ohled B
30
Obr. 5/5-5: Guideline structural data for a raised false floor – SecoGear 24 kV
A Larger dimension is valid for the cubicle with circuit breaker including combination with them, in other cases smaller
dimension is valid – however always consider annotation 2)
28/106 - 1
VLM000363 Rev5 en
5.12 Photos assembly
Figure 5/6: For bolting the switchgear panels together, through holes are provided on the left-hand side and threaded bushes on the
right-hand side, near the front and rear edges of the side walls, and through holes on both sides in the central part of the walls
29
1.1 8
17
43.1
1.8
20
Figure 5/11: View into the high voltage area at the front Figure 5/12: View into the busbar compartment, shown
without insulating covers
1.8 Central catch 2 Branch conductor
20 Horizontal partition, removable 3 Busbar
43.1 Duct cover for external control cables 5 Tulip isolating contact
9 Partition, removable
30
5.13 Busbar junctions and partitioning drawings (24 kV)
a) Bushing with busbar supports for busbar systems with double b) Version with busbar supports for busbar systems with single
conductor conductor
Figure 5/13: Panels - 24 kV - Arrangement of the bushing plate and busbar bushings on the right-hand panel side wall with
busbar barriers. View of the inside
2 Branch conductor
3 Busbar section
28 Bushing plate
29 Busbar bushing
29.1 Busbar support for single conductor 29.2
Busbar support for double conductor
a) Bushing with busbar supports for busbar systems with double b) Version with busbar supports for busbar systems with single
conductor conductor
Figure 5/14: Panels - 24 kV - Arrangement of the bushing plate and busbar bushings on the right-hand panel side wall in bus-tie
panels. View of the inside
1 VLM000363-Rev5, en - 31/106
Rated busbar current
2 Branch conductor
3 Busbar section
3.4 M10Bolt
58 Insulating cover
Important note:
The contact springs 29.3 must be inserted
during the installation of busbars. These contact
springs make the connection between the
busbar 3 and the metal tube 29.4 and prevent
Figure 5/16: Panels - 24 kV - detail of the busbar bushing, sectional view damage caused by partial discharges inside
the bushing on live busbars.
3 Busbar
Always check that there is good contact
29 Busbar bushing
between the metal tube 29.4 in the bushing and
29.2 Busbar support for double conductor the busbars via the contact spring.
29.3 Contact spring
29.4 Metal tube
32/106 - 1
VLM000363 Rev5 en
During assembly, cut out the insulating cover and lid to fit the cross
section of the feeder bar or busbar.
Figure 5/17: Panels - 24 kV - Arrangement of the busbar and branch conductors at the busbar ends. In continuous busbars, the
connections are similar, but without lid holder 58.1 and without spacer plate 3.5.
2 Branch conductor
3 Busbar section
3.5 Spacer plate
58 Insulating cover
58.1 Lid holder
58.5 Lid for insulating cover
(58.6) Washer ISO 7089
58.7 Washer 25 mm diameter
163 M10 hexagon socket head screw
164 M10 nut
165 10 mm spring washer
1 VLM000363-Rev5, en - 33/106
3.3
35
Fig ur e 5/ 18: Panels 24 kV - Bolted busbar joint for top mounted box, shown for left-hand busbar end. In continuous busbars is
the connection similary, but without the lid holder 58.1 and without the spacer plate 3.5.
34/106 - 1
VLM000363 Rev5 en
Figure 5/19: The earthing switch drive shaft is supplied loose when the top-mounted boxes are removed for transport purposes.
View for the open position of the earthing switch with individual mechanism parts fitted in the positions for correct
operation
Figure 5/20: Operating mechanism area of top-mounted earthing switch in detail. Follow the sequence and arrangement of the
parts on the drive shaft precisely when assembling. The figure shows the arrangement for the open position of the
earthing switch
78.4 Auxiliary limit position switch for earthing switch ON 78.5 Auxiliary limit position switch for earthing switch OFF
1VLM000363-Rev5, en - 35/106
5.14 LVC swivel plate photos
The relative work and operating procedures must be carried out carefully by trained specialists familiar with the
installation, taking into account all the relative safety regulations according to the IEC and other relevant professional
bodies, as well as any local work regulations and instructions.
Warning:
Do not walk on the top surfaces of the switchgear panels (rupture points for pressure relief). The
pressure relief devices could be damaged!
6.1 Commissioning
6.1.1 Preparatory work
In preparation for commissioning, the following work must be carried out prior to connection
with the high voltage power supply:
Check the general condition of the switchgear for any damage or defects.
Visually inspect the switching devices, withdrawable parts, isolating contacts,
insulating parts, etc.
Check connection of the main earthing bar to the installation earthing conductor
(following the appropriate safety regulations).
Check the paintwork for damage and, where necessary, touch up as described in
section 7.4.
Remove all residues of materials, foreign bodies and tools from the switchgear.
Clean the switchgear, rubbing down insulating parts with a soft, dry, clean, non-fraying
cloth. Remove any greasy or sticky dirt as described in section 7.3.
Correctly remount all covers etc. removed during assembly and testing procedures.
Transport caps 13.9 on vacuum circuit-breakers - if still fitted - must be removed.
Pole tube lids 13.10 on vacuum circuit-breakers may be fitted in certain systems and on
certain circuit-breakers. Check that they are fitted correctly.
Lifting eyebolts 13.13 on high current vacuum circuit-breakers must be removed if still
fitted.
Perform AC voltage testing of the main circuits according to IEC 62271-200:2003
36
where necessary. Pay special attention to voltage transformers and cables, etc. during
this procedure. A testing and earthing module 142 can be used to make the
connections (see section 6.3.2).
Switch the auxiliary and control voltage on.
Carry out testing operations on switching devices manually or by electrical control, and
simultaneously observe the relative position indicators.
Check mechanical and electrical interlocks for effectiveness, without using force.
Set the protective devices in the switchgear to the required values and check their
function with test equipment.
In switchgear panels with an additional ventilation system for high current
circuit-breakers (required for ambient temperature higher than > 40 °C and/or higher
frequency - 60Hz -according to section 1.3 and figure 6/15 and 6/16), flap 20.3 hanging in
partition 20 must rest loosely against leaf spring 20.4 (with the centrifugal fan at a
standstill, if fitted ). This is not standard.
To check:
– Insert a suitable screwdriver through opening 20.5 in horizontal partition 20 and into
bracket 20.6 on flap 20.3.
– Swing flap 20.3 upwards and allow it to rest loosely again on leaf spring 20.4.
– If the flap is in the locked position, use the screwdriver to press leaf spring 20.4
downwards by approx. 5 mm to release the lock before swinging the flap.
– If any centrifugal fans controlled in relation to primary current are fitted, also check that
these function correctly.
For any other matters regarding operation of the withdrawable circuit-breaker part and
testing facilities for the withdrawable part, see section 7.5.
Instruct local operators regarding the basic details of regular handling of the switchgear.
Check readiness for operation and switching status of electrical systems upstream and
downstream of the switchgear.
6.1.2 Start-up
Comply with all relevant safety regulations.
Ensure that the circuit-breakers in the system are in the OFF position.
Remove any existing earthing and short circuiting connections in the critical switching area.
Energize the feeder cables.
Connect the switchgear step by step, observing the signals and indicators.
Check that relative conductors are in phase, where necessary, when there are several
incoming feeder cables and switchgear sections (also see section 6.3.2).
Carry out all measurements and check all functions which depend on high voltage power
supply being connected.
Watch out for irregularities of any kind.
Note:
The Vacuum circuit breaker must not be stopped in any intermediate position in the travel
range between the service and test/disconnected position!
Manual withdrawal from the service position into the test/disconnected position:
Ensure that the apparatus is in the OFF position.
Reverse the procedure described above for insertion into the service position.
Important note:
Insertion and withdrawal of circuit-breakers (and other withdrawable parts) must be gradual,
in order to avoid any shocks which could deform the mechanical interlock. If the operations
are prevented, do not force the interlocks and check that the operating sequence is correct.
The force normally applicable to the insertion/withdrawing lever is 260 N. In any case, the
maximum applicable force must never exceed 400 N. Please also refer to the technical
documentation of the circuit-breakers for installation operations.
Caution: the insertion and withdrawal must always be carried out with the apparatus open!
Do not use force to move withdrawable parts with locking magnet Y0 or RL2 in the event of
an auxiliary voltage drop. If this occurs, they are locked along the whole travel range between
the service and test positions.
To remove the interlock, consult the technical documentation of the circuit-breakers.
Withdrawal from the test/disconnected position onto the service truck:
Open the door of the circuit-breaker compartment.
Release control wiring plug 10.2 and place it in the storage position on the withdrawable
part.
Position service truck 124 with guide pins 124.2 of the adjustable bench top at the
correct height facing the panel front, and allow catch 124.3 to engage.
Move sliding handles 13.11 inwards against the springs to release withdrawable part 13,
draw the withdrawable part out onto the service truck and secure it in the catches on the
truck.
Press release lever 124.4 (at the front underneath the bench top) and release the
service truck from the switchgear panel.
Secure the position of the shutters with padlock 130 (Fig. 6/17).
Insertion from the service truck into the test/disconnected position:
Carry out the procedure described above for withdrawal in reverse order.
6.2.2 Circuit-breaker - SecoVac Charging the stored energy spring system:
On the circuit-breaker with charging motors, charging is carried out automatically. If the
charging motor should fail, the charging procedure can be carried out or completed
manually.
On breakers with manual charging systems, either opens the door with the withdrawable
part in the disconnected position, insert charging lever 128 into the recess and pump for
approx. 25 strokes until the charged condition is indicated.
Or breakers where the charging lever is integrated, take the lever and pump 10 times
see fig. 6/4a.
When the charged condition is reached, the charging mechanism is automatically
disengaged, and any further strokes of the lever have no effect. See the fig. 6/4b.
38
Pumping is effective if the lever is moved in angle 90°.
Caution!
If the operation is prevented, do not force the interlock and check that the operation
sequence is correct.
Fit operating lever 122 onto hexagonal shaft 14.1, which is now released for operation.
Note:
Put operating lever 122 in pointed upwards or downwards on the hexagonal shaft so that
there is sufficient room for movement of the operating lever even if space is limited at the
sides.
Turn the lever clockwise through approx. 180° until the stop is reached to close the
earthing switch, or anticlockwise until the stop is reached to open the earthing switch.
Observe the mechanical/electrical switch position indicator.
Remove operating lever 122. Slide 14.2 remains open if the earthing switch is in the
closed position.
Make sure that the operating lever is turned right up to the stop in the opening process, to
ensure that the earthing switch is in its defined limit position. The manual operating
mechanism can also be fitted with a locking magnet.
Secure neighboring areas to prevent inadvertent contact with live parts (e.g. feeder
cables). The procedure for removing earthing is the same, only in reverse order
capacity
These trucks carry out the same function as the earthing switches without making capacity.
Therefore they do not have any capacity to earth the live circuits under fault conditions. They
are used to ensure fixed additional earthing, as required byhe plant service and maintenance
procedures, as at further guarantee for personnel. The use of these trucks foresees removal of
the switching device from the switchgear (circuit-breaker ) and its replacement with the truck.
The units preset for use of earthing trucks are fitted with a key lock which, if activated, prevents
their racking-in.
These trucks carry out the same function as the earthing switches with making capacity. They
consist of circuit-breakers only fitted with top (main busbar earthing) or bottom (power cable
earthing) terminals. The contacts without terminals are short-circuited by means of a copper bar
and connected to earth by means of the apparatus truck. They keep all the characteristics of the
circuit-breakers, such as full making capacity and opening of the live circuits under fault
conditions. They are used to ensure extremely efficacious earthing on circuits stressed by a
fault. They allow opening and closing operations to be carried out rapidly with remote electric
control.
The use of these trucks foresees removal of the switching device from the switchgear
(circuit-breaker) and its replacement with the truck. The units preset for use of earthing trucks are
fitted with a key lock which, if activated, prevents their racking-in.
During the racking-in phase, the main busbar earthing truck only lifts the top shutter and presets
the contacts connected to the top branches (and therefore the main busbar system) for closing to
earth by means of a control.
During the racking-in phase, the power cable earthing truck only lifts the bottom shutter and
presets the contact connected to the bottom branches (and therefore to the power cables) for
closing to earth by means of the control.
These trucks can also be used in bus-tie units. In this case, they earth the two sides of the main
busbar system.
Isolation truck
The isolation truck allows the switchgear top and bottom contacts to be connected directly.
Connection is made extremely safe by using the poles of the circuit-breakers to insulate the
connection bars from the external environment. In the incoming/outgoing units, it connects the
main busbar system to the power cables, whereas in the bus-tie units, to the two sides of the
busbar system.
This truck is used in the SecoGear switchgears to make incoming/outgoing units without
circuit-breakers in radial networks, to make cable connections between two switchgears placed
in front of each other, and for constructing interconnection units and creating bus-tie-riser units
with double insulation (in this case, both the units are made from bus-ties, the first fitted with a
circuit-breaker and the other with an isolation truck).
41
1.1 7
1.1 8
145
Fig ur e 6/ 1: Operation of the door screw Fig ur e 6/ 2: Operation of the door catch
42/106 - 1
VLM000363 Rev5 en
13. 2
13. 1
13. 5 121
128 13. 4
13. 8
Figure 6/4: Manual operation of withdrawable part with Figure 6/5: Before inserting the hand crank, it is necessary to
SecoVac open the hole for it - turn the slide by means of the
13.1 Mechanical ON push-button key test/disconnected position and the service
13.2 Mechanical OFF push-button position, clockwise up to the stop to the to the
13.4 Mechanical switch position indicator service position and anti-clockwise for the test/
13.5 Mechanical operating cycle counter disconnected position
13.8 Charging condition indicator
128 Charging lever 121 Hand crank
32
13
10.2
10.1
13.11
124.1
124 13.12
Figure 6/7: Control wiring plug connector blocked to Figure 6/10: Withdrawable part standing on service truck
prevent disconnection with the withdrawable part in
the service position 13 Withdrawable part
10.1 Control wiring socket 13.11 Sliding handle
10.2 Control wiring plug 13.12 Catch (connected to sliding handle 13.11)
124 Service truck
32 Interlock
124.1 Height adjuster
1VLM000363-Rev5, en - 43/106
Figure 6/15: Fitting of horizontal partition 20 with additional
ventilation for high current circuit-breakers,
required due to increased ambient temperature
(>40°C) and/or increased frequency (60 Hz)
according to section 1.3. The internal flap is
shown in the service position (open). Side view,
but without the wind vane with micro-switch
required with a fan. Not standard.
20 Horizontal partition, here fitted with the
additional ventilation facilities for the
circuit-breaker
20.3 Flap
20.4 Leaf spring Figure 6/16: Horizontal partition with additional ventilation
20.5 Inspection aperture facilities. Checking unimpeded movement of
20.6 Bracket the internal flap 20.3
20.7 Centrifugal fan
20.5 Inspection opening
44
Figure 6/19: Operating accessories
31.28 Emergency manual operating lever (for switching off VM1 type circuit-breaker)
31.29 Auxiliary spring to secure the opening capacity (for VM1 type circuit-breaker)
90.8 Charging lever (for circuit-breaker)
121 Hand crank (for moving the withdrawable part inside the panel)
122 Operating lever (for earthing switch)
128 Charging lever (for circuit-breaker)
145 Double bit key (for using the central catch and screw type door catch)
147 Hand crank (for using the central catch or screw type door
45
46
7. Maintenance
7.1 General
Maintenance serves to preserve trouble-free operation and achieve the longest possible working life of
the switchgear. It comprises the following closely related activities:
Inspection: Determination of the actual condition
Servicing: Measures to preserve the specified condition
Repair: Measures to restore the specified condition
Note:
When carrying out all maintenance work, the regulations in the country of installation must be strictly
complied with.
Maintenance work may only be performed in a careful manner by trained personnel familiar with the
characteristics of the individual switchgear, in accordance with all relevant IEC safety regulations and
those of other technical authorities, and with other overriding instructions. It is recommended that GE
service personnel be called in to perform the servicing and repair work detailed below.
The inspection and servicing intervals for some of the equipment/components (e.g. parts subjects to
wear) are determined by fixed criteria, such as switching frequency, length of service and number of
short-circuit breaking operations. On the other hand, for other parts the length of the intervals may
depend, for example, on the different modes of operation in individual cases, the degree of loading, and
also environmental influences (including pollution and aggressive air).
If necessary, further details can be taken from the technical documentation for the switchgear
installation (including, for example, any special operating conditions agreed on).
Time intervals for maintenance work to be carried out always depend on the operating conditions of the
switchgear, and mainly on the mode of operation, the number of rated and short-circuit current switching
operations, ambient temperature, pollution etc. We recommend carrying out the maintenance work at
the following intervals:
Inspection 7.2 4 1)
47
7.2 Inspection
Where necessary, the working area must be isolated and secured against reconnection in accordance
with the Safety Regulations specified by IEC and appropriate national standards before inspection.
Correct condition of the switchgear should be monitored by regular inspections.
Under normal operating conditions, inspection should be carried out once every four years by
specially trained professional electricians.
Under abnormal operating conditions (including adverse climatic conditions) and/or special
environmental stresses (heavy pollution and aggressive atmosphere, among others), inspection
may be necessary at shorter intervals.
Inspection is primarily to carry out a visual check for grime, corrosion and moisture:
- Effects of high temperature on the main circuits,
- Traces of partial discharge on the insulating material parts,
- Traces of leakage current on the insulating material parts,
- Surfaces of the contact systems.
However, inspection must also to include correct mechanical/electrical operation of the following
parts: switching devices, actuating, interlocking, protection and signalling devices.
Special conditions:
On panels with additional ventilation devices due to increased ambient temperature (see also
section 1.3):
1. Check flap 20.3 for correct operation. (Also see section 6.1.1 and figures 6/15 and 6/16.)
2. The centrifugal fan (if fitted) does not require any special maintenance. Its working life - depending
on the service conditions, and one significant parameter being the room temperature - is approx.
between 20,000 and 30,000 operating hours.
7.3 Servicing
If, during the course of an inspection in accordance with section 7.2, the need for cleaning measures
has been established, proceed as follows:
Where necessary, the working area must be switched off and secured against reconnection in
accordance with the Safety Regulations specified by IEC and appropriate national standards before
cleaning.
48
Clean the surfaces in general:
- Weakly adhering dry dust deposits: with a soft dry cloth.
- More strongly adherent grime: with mildly alkaline household cleanser or with ETHANOL F 25 M.
Clean insulating surfaces and conductive components with ETHANOL F 25 M.
Wipe down after cleaning, using clean water, and dry properly.
Should partial discharges occur as a result of condensation, application of a thin silicone film on the
surface concerned is often effective as a temporary remedy. It is advisable to ask the GE after-sales
service department for advice regarding permanent solutions to this type of unusual problem.
7.4 Repair
7.4.1 Switchgear in general
Repair of surface damage:
Carry out repair work immediately after a defect has been discovered.
Completely remove all rust from damaged paintwork areas on steel sheet and other steel parts by
mechanical means, e.g. with a wire brush.
Lightly grind the surrounding paint coat and carefully degrease the entire area. Then immediately
apply an anti-rust primer and, after an appropriate hardening time, apply the top coat. Only use
suitable and compatible paint products.
Apply the top coat in standard RAL 7035 colour, or the relevant special colour.
Carefully remove any white rust on aluminium/zinc surfaces with a wire brush or cleaning pad, e.g.
Scotch-Brite, and clean loosely adhering particles with a dry, non-fraying cloth. Next treat the cleaned
parts with zinc spray or zinc powder paint and, finally, treat with aluminium spray for colour matching.
Carefully remove any white rust from passivated operating parts and rust formation on phosphatised
parts with a wire brush or metal-free cleaning pad, e.g. Scotch-Brite, and clean with a dry cloth. Then
grease evenly (with Isoflex Topas NB 52).
Switchgear in general:
Follow the maintenance instructions in the manuals for individual equipment components.
Check that the bolt connections at the contact points in the busbar system and the earth connections
are tight, and that the contact system functions correctly.
Where necessary, grease slide plates and bearings in the panel again or thoroughly clean them.
Then grease them again with Isoflex NB 52 lubricant.
Top up grease on contact areas in the contact system when corroded or otherwise as necessary,
or, when lubrication is inadequate or missing, thoroughly clean the areas concerned and grease
them again with Isoflex Topas NB 52 lubricant.
Remove the contact system for thorough cleaning as described below (Figures 7/1): - Slide in the
two inner ring tension springs 4.4 facing the breaker pole to a position beside the other two outer ring
tension springs, thus releasing contact system 4.3, and remove the contact system - The contact pin
of the contact system and the slot on the contact arm must be cleaned and greased. Fit contact system
back to front on the thin end of arbor 127 and slide it forwards onto the thicker part of the shank.
- Fit arbor 127 onto the relative contact arm 4.2, slide the contact system 4.3 over onto the contact arm,
and withdraw the arbor.
- Check that all contact fingers and ring tension springs have a perfect fit.
Note:
The set installation position of contact arms 4.2 must not be changed by undue use of force
Replacement of the contact pins when the surface is damaged:
After any required replacement of contact pins 4.1, the latter should be retightened using the socket
head bolts.
M20 250 Nm
49
7.4.2 Replacement of complex functional groups (Figures 3/1)
Precise matching of functions for control, interlocking and signaling only permits replacement of
individual components to a limited extent.
The following assemblies are prefabricated and tested at the works, maintaining high quality
standards. In the case of faults, they must therefore be completely replaced.
1. Withdrawable assembly:
Disconnect plug connector 10.3.
Remove interlock rod 13.91 with pin 13.27 from the withdrawable assembly.
Remove the circuit-breaker from the withdrawable assembly (4 x M12 bolts).
Mount the circuit-breaker on a new withdrawable assembly in the reverse order, using new circlips
and special pliers for pin 13.27.
Check the setting of interlocking rod 13.91.
- Turn spindle 18 anti-clockwise to the stop for the disconnected position:
The distance between lever 13.26 and cam 13.25 must be 2~1 mm.
The distance between roller 13.24 and angle lever 13.92 must be 0.5 mm.
- Turn spindle 18 clockwise to the stop for the service position:
The distance between lever 13.26 and cam 13.25 must be 2~1 mm.
The distance between roller 13.24 and angle lever 13.92 must be 0.5 mm.
- Loosen bolts 13.91.2 or 13.92.1 for any necessary adjustment.
Note:
The auxiliary switches of the interchangeable groups are adjusted at the works.
When final installation of the earthing switch and operator takes place on site, it may be necessary to
carry out further precise adjustment of the auxiliary switch. In this case, the following should be taken
into account:
There must be a run-on of 0.5 mm in the fully operated position before the plunger reaches the stop
(for safety reasons).
Auxiliary limit switch 11 .4 for earthing switch ON must be operated immediately after the dead
centre position of the toggle spring mechanism has been reached in the closing process and the
automatic quick-closing process has started.
Auxiliary limit switch 11.3 for earthing switch OFF must be operated on earthing switches with
manual mechanisms during the opening movement of slide 14.2 before half of the hexagonal shaft
has become visible, or 1 mm before the tab of the slide makes contact with the armature of the
de-energised locking magnet.
50
7.5 Spare parts, auxiliary materials, lubricants
7.5.1 Spare parts
A spare parts list is available on request for procurement of spare parts. It basically includes moving
parts and parts subject to wear. When parts are required, the serial number of the relative switchgear or
switching device should always be quoted.
Touch-up paint:
Standard colour RAL 7032
Figure 7/1: Fit the contact system back-to-front on the thin Figure 7/2: Slide the contact system over from the arbor
end of the arbor and slide it onto the thicker onto the isolating contact arm and allow it to
shank area engage there
51
8. Product quality and environmental protection
The SecoGear type panels are produced in compliance with the requirements of international
standards for the quality management system and environmental management system. In
these fields, the excellent level is proved by quality certificates according to ISO 9001 and by the
EMS according to ISO 14 001.
GE company is committed to complying with the relevant legal and other requirements for
environment protection according to the ISO 14 001 standard.
The duty of company is to facilitate subsequent recycling or disposal at the end of product life.
During disposal of the product, it is always necessary to act in accordance with local legal
requirements in force.
Metal material (Fe, Cu, Al, Ag, Zn, W, others) Separation and recycling
Rubber Disposal
Oil as dielectric (transformer oil) Draining from equipment and further recycling or disposal
SF gas
6 Discharging from equipment and further recycling or disposal
52
The data and illustrations are not binding. We reserve the right to make
changes in the course of technical development of the product.