Oltc Ubb
Oltc Ubb
Oltc Ubb
The information provided in this document is intended to be general and does not
cover all possible applications. Any specific application not covered should be
referred directly to ABB or its authorized representative.
This document must not be copied without our written permission, and the contents
thereof must not be imparted to a third party nor be used for any unauthorized
purpose. Contravention will be prosecuted.
Manufacturer’s declaration
The manufacturer ABB AB
Components
SE-771 80 LUDVIKA
Sweden
Hereby declares that
The products On-load tap-changers, type UB
with motor-drive mechanisms, types BUE and BUL
comply with the following requirements:
By design, the machine, considered as a component of a mineral oil filled power transformer, complies
with the requirements of
• Machinery Directive 89/392/EEC (amended 91/368/EEC and 93/44/EEC) and 93/68/EEC (marking)
provided that the installation and the electrical connection are correctly realized by the manufacturer
of the transformer (e.g. in compliance with our Installation Instructions)
and
• EMC Directive 89/336/EEC regarding the intrinsic characteristics to emission and immunity levels
and
• Low Voltage Directive 73/23/EEC (modified by Directive 93/68/EEC) concerning the built-in motor
and apparatus in the control circuits.
Certificate of Incorporation:
The machines above must not be put into service until the machinery into which they have been
incorporated has been declared in conformity with the Machinery Directive.
Date 2013-02-15
Signed by .........................................................................
Hans Linder
The on-load tap-changers, type UB, is housed in the Small amounts of explosive gases might come out
transformer tank. The motor-drive mechanism, type BUE or from the breathing devices (dehydrating breather
BUL, is attached to the transformer tank and connected to or one-way breather). Make sure that no open
the tap-changer by means of drive-shafts and a bevel gear. fire, hot surfaces or sparks occur in the immediate
surroundings of the breathing devices.
Safety warnings
The following warnings and notes are used in the manual: CAUTION
CAUTION
If the tap-changer is not in the exact position and the – – Hygrostat for extra heater (option). We recommend a
handcrank is pulled out, the motor-drive mechanism setting at approximately 60 %.
will start and go to the exact position if the power
supply is on. – – Outlet (option) with earth fault protector.
–– The draghands show the max. and min. tap-position To maintain the high reliability of the tap-changer it is
between which the tap-changer has been working since important that the inspections and the overhauls be
last resetting. carried out at the interval stated on the rating plate.
–– For resetting of the emergency stop turn the knob Maintenance of the tap-changer consists of three major steps:
clockwise.
– – Inspection to be carried out by site personnel once a year
–– The LOCAL/REMOTE switch. In position LOCAL the tap- (see below)
changer can be operated by the RAISE/LOWER switch. In
position LOCAL remote operation is rendered impossible. – – Overhaul to be carried out by a specialist at intervals stated
In position REMOTE the tap-changer is operated from the on the rating plate
control room or by a voltage regulator. Local operation is
not possible in remote position. – – Contact replacement to be carried out by a specialist. The
possible need for replacement is decided during overhaul.
–– In case of a failure in power supply for the motor-drive
mechanism, it is possible to handcrank the tap-changer. A specialist is a service engineer from ABB or an authorized
Put the handcrank on the shaft. Make sure it has entered person trained by ABB for maintenance work on UB tap-
the slot in the shaft. Crank in the desired direction as per changers.
the information plate above the shaft. The number of turns
CAUTION WARNING
Approval should be given by the site engineer in Checking of the breather and the oil level must be
charge for inspection as well as for operating the tap- carried out from ground level since the transformer is
changer. energized.
The inspection is to be carried out while the transformer is in The drying agent usually starts to change colour from the
service. bottom of the breather. If it changes colour at the top of
the breather, there is a leakage in the connections to the
On the conservator the following are to be checked: conservator. Locate the leakage and seal it.
– – Oil level
– – Breather 2. Checking of the oil level in the conservator
The oil level in the conservator should be according to the
In the motor-drive mechanism the following items are to be instructions in the transformer documentation.
checked:
– – Motor and counter 3. Checking of the motor and the counter
– – Emergency stop Open the motor-drive cabinet door and turn the selector-
– – Heater switch to the LOCAL position. Then turn the control switch to
– – Earth fault protector for the outlet (option) the RAISE (LOWER) position.
If the tap-changer is equipped with an oil filter unit, the Check that the motor works properly, the position indicator
pressure drop over the filter is to be checked. increases (decreases) one step, and the counter advances
one step for each operation. Record the counter’s value. The
Required tools counter shows the number of operations run by the tap-
The following eq uipment is required for the inspection: changer (the overhaul schedule can be determined with the
– – Set of screwdrivers help of this information).
– – Pen and note pad
Turn the control switch to the LOWER (RAISE) position.
Check that the motor also works properly in that direction,
the position indicator decreases (increases) one step and the
counter advances one step more.
1
15
16
3
17
18
4
5
19
7
20
9
21
10
11
1. Bevel gear 12. Valve R½” for filling and draining of oil
2. Lifting eye 13. Top cover
3. Flange 14. Connection to conservator
4. Cylinder 15. Pressure relay
5. Change-over selector moving contacts 16. Air release valve to transformer tank
6. Change-over selector fixed contacts 17. Air release valve for tap-changer
7. Selector switch fixed contacts 18. Position indicator window
8. Selector switch moving contacts 19. Current collector terminal
9. Selector switch shaft 20. Transition resistor
10. Bottom drain screw 21. Shielding rings
11. Bottom
1. Bevel gear
2. Horizontal shaft with protection cover
3. Vertical shaft with protection cover
4. Rating plate
5. On-load tap-changer
6. Motor-drive mechanism
12
15
14 13 16
12
8 6
16
10
11
13
15
1. Position indicator with drag hands for max. and min. 8. Emergency stop
position 9. RAISE/LOWER switch
2. Tap-change in progress indicator 10. LOCAL/REMOTE switch
(Red: in progress, White: in position) 11. Protective motor switch
3. Counter 12. Air vent
4. Outgoing shaft with multi-hole coupling half 13. Door-operated switch for lamp
5. Shaft for hand crank 14. Lamp
6. Locking device prepared for padlock 15. Descriptions and circuit diagram
7. (Option) Outlet 16. Hand crank
ABB AB
© Copyright 2013 ABB, All rights reserved. 1ZSE 5492-156 en, Rev. 4, 2013-04-15
Components
SE-771 80 Ludvika, Sweden
Phone: +46 240 78 20 00
Fax: +46 240 121 57
E-Mail: sales@se.abb.com
www.abb.com/electricalcomponents