S&C Series 2000 Circuit-Switchers Inspection Recommendations

Outdoor Transmission (69 kV through 230 kV)

To ensure Series 2000 Circuit-Switcher’s continued proper Each user’s own experience will determine whether
performance, it should be inspected in accordance with more frequent inspections are required. Note that for most
the recommended schedule and procedures contained in transformer-protection applications, the first Circuit-
the tables of this publication. Table  I indicates the fre­ Switcher inspection is recommended at 10 years from the
quency with which each major component should be time of delivery. Then once every five years for units that
inspected on a Series 2000 Circuit-Switcher rated 69  kV are between 10 and 20 years old and once every three years
through 138 kV; 25 kA fault interrupting. Table II similarly for Circuit-Switchers that are over 20 years old.
indicates the frequency with which each major compo­
nent should be inspected on a Series 2000 Circuit-Switcher Table IV—Recommended
rated 69  kV through 138  kV; 40  kA fault interrupt­ ing. Inspection Procedures
Table III lists the frequency for Circuit-Switchers rated The Series 2000 Circuit-Switcher inspection procedures to
161 kV or 230 kV. Table IV lists a summary of inspec­tion be followed are summarized in Table  IV. The applicable
procedures appropriate for each component. S&C instruction sheets for the Circuit-Switcher, ground­ing
switch, etc., should be referenced for further details.
Tables I, II, and III—Recommended
Inspection Schedules Table V—Doble Test Values for Insulating
A mechanical-operations test value is indicated in Tables I Support Columns
and II for those 69‑kV through 138‑kV Series 2000 Circuit- The allowable power dissipation factors listed in Table V
Switcher components affected by the number of mechani­ are indicative of the dielectric integrity of the operating rod
cal operations performed. A mechanical-operations test and interior of a Series 2000 Circuit-Switcher insulating
value is also indicated in Table  III for those 161‑kV and support column.
230‑kV Series 2000 Circuit-Switcher components affected Measurement of power dissipation factors on the user’s
by the number of mechanical operations performed. Each Series 2000 Circuit-Switcher insulating support columns is
mechanical-operations test value is offered as a guideline not required to fulfill the terms of S&C’s Circuit-Switcher
to the number of open-close operations which might warranty and should only be made by qualified personnel
rea­sonably be expected for the component before replace­ who are fully trained in high-voltage measuring equipment,
ment is required. and the techniques for taking measurements on high-volt-
Electrical-operations limits are also listed in each table age equipment.
for the interrupter, since this component is affected by the
number of electrical operations performed. These limits Tables VI, VII, and VIII—Resistance Values
are dependent upon the Circuit-Switcher application and
for Live-Parts
magnitude of current switched. For the interrupter, the
electrical-operations limit thus provides the overriding The allowable resistance values listed in Tables VI, VII, and
guideline to the number of open-close operations which VIII are provided for the convenience of users whose prac-
might be expected before replacement is required. tices include measuring and recording the resistance over
current-carrying and current-interrupting components of a
The actual number of open-close operations which may Circuit-Switcher.
be obtained for a component in service will depend upon
the nature of the application, the installation envi­ronment If unseen damage to the Series 2000 Circuit-Switcher’s
(e.g., whether subject to temperature or humid­ ity live parts is suspected, resistance values can be measured
extremes, or highly corrosive or dusty atmospheres), and across specified points on the device to confirm and isolate
the observance of the recommended inspection schedule. the damaged portions. A standard dc resistance bridge
should be used with the measuring points and values speci-
An inspection frequency is shown for each component fied. Such measurements are not required to fulfill the
listed. To maximize the operating life of the component, it terms of S&C’s Circuit-Switcher warranty, and should only
is recommended that the user perform the inspection pro­ be made by qualified personnel who are fully trained in the
cedures described in Table IV, at the frequency indi­cated— measuring equipment and the techniques for taking resis-
either in number of open-close operations or years, tance measurements on high-voltage equipment. The mea-
whichever occurs more often. If the inspection results so surements can be used to identify areas of high resistance,
indicate—or if dictated by the mechanical-oper­ations test to be remedied by cleaning and maintenance, or compo-
value or electrical-operations limit guide­line—the compo- nent replacement. Contact your local S&C Sales Office if
nent should be replaced. more information on taking resistance measurements is
required.

February 10,  2014© S&C Electric Company Data Bulletin  716-90

Supersedes Data Bulletin 716-90 dated 9-16-2013
S&C Series 2000 Circuit-Switchers

Table I—Recommended Inspection Schedule for 69-kV Through 138-kV; 25 kA Fault Interrupting Series 2000
Circuit-Switcher Components
Mechanical- Operations Electrical-Operations Limit Inspection Frequency②
Test Value,① Maximum Number of Number of
Component Number of
Number of Application Current, Open-Close Open-Close
Open-Close Operations Years
Amperes Operations Operations
Operator, Interrupter Power Train,
Insulating Support Column, and 5 000 — — — 1 500 ★
Disconnect Power Train

Capacitor, Reactor, 200 5 000

or Load Switching 600 3 000 1 500◆ ★◆
Load Switching 1 200 1 500
Primary-fault
25 000 10
Interrupter 5 000 Interrupting
Secondary-fault
4 000 25
Interrupting Not applicable
25 000 5
Fault Closing
40 000 1

Disconnect Live Parts 5 000 — — — 1 500 ★

Bypass Accessory — — — — Not applicable ★
Grounding Switch — — — — Not applicable ★
Remote Gas-Density Monitor — — — — Not applicable 8

① Based on mechanical-operations tests performed by S&C utilizing ◆ On Circuit-Switchers not equipped with a remote gas-density monitor,
new Circuit-Switchers, with no intervening maintenance performed. interrupters should be checked for low gas pressure (red targets) during
② Frequently operated Circuit-Switchers (typically 200 or more open- the user’s normal day-to-day operating routine.
close operations per year) should be inspected after the first 250 opera­ ★ First inspection at 10 years from delivery, 5 years for Circuit-Switchers
tions; thereafter, they should be inspected at the frequency indicated. between 10 and 20  years old, 3  years for Circuit-Switchers more than
Fre­quently operated Circuit-Switchers also require annual lubrication of
20 years old.
the disconnect live parts. See Table IV on pages 4 and 5.

Table II—Recommended Inspection Schedule for 69-kV Through 138-kV; 40 kA Fault Interrupting Series 2000
Circuit-Switcher Components
Mechanical- Operations Electrical-Operations Limit Inspection Frequency②
Test Value,① Maximum Number of Number of
Component Number of
Number of Open-Close Application Current, Open-Close Open-Close
Operations Years
Amperes Operations Operations

Operator, Interrupter Power Train,

Insulating Support Column, and 2 000 — — — 1 000 ★
Disconnect Power Train

Load Switching 1 200 1 500 1 000◆ ★◆

Primary-fault
40 000 5
Interrupter 2 000 Interrupting
Secondary-fault Not applicable
4 000 25
Interrupting
Fault Closing 40 000 5
Disconnect Live Parts 2 000 — — — 1 000 ★
Bypass Accessory — — — — Not applicable ★
Grounding Switch — — — — Not applicable ★
Remote Gas-Density Monitor — — — — Not applicable 8
① Based on mechanical-operations tests performed by S&C utilizing ◆ On Circuit-Switchers not equipped with a remote gas-density monitor,
new Circuit-Switchers, with no intervening maintenance performed. interrupters should be checked for low gas pressure (red targets) during
② Frequently operated Circuit-Switchers (typically 200 or more open- the user’s normal day-to-day operating routine.
close operations per year) should be inspected after the first 250 opera­ ★ First inspection at 10 years from delivery, 5 years for Circuit-Switchers
tions; thereafter, they should be inspected at the frequency indicated.
between 10 and 20  years old, 3  years for Circuit-Switchers more than
Fre­quently operated Circuit-Switchers also require annual lubrication of
20 years old.
the disconnect live parts. See Table IV on pages 4 and 5.

2  S&C Data Bulletin 716-90

 S&C Series 2000 Circuit-Switchers

Table III—Recommended Inspection Schedule for 161-kV and 230-kV Series 2000 Circuit-Switcher Components
Mechanical- Operations Electrical-Operations Limit Inspection Frequency②
Test Value,① Maximum Number of Number of
Component Number of
Number of Application Current, Open-Close Open-Close
Open-Close Operations Years
Amperes Operations Operations

Operator, Interrupter Power Train,

Insulating Support Column, and 1 500 — — — 750 ★
Disconnect Power Train
Load
Switching
1 200 1 500 750◆ ★◆
Primary-fault
20 000 10
Interrupting
Interrupter 1 500 Secondary-fault
4 000 25
Interrupting Not applicable
20 000 5
Fault Closing
40 000 1

Disconnect Live Parts 1 500 — — — 750 ★

Bypass Accessory — — — — Not applicable ★
Grounding Switch — — — — Not applicable ★
Remote Gas-Density Monitor — — — — Not applicable 8

① Based on mechanical-operations tests performed by S&C utilizing ◆ On Circuit-Switchers not equipped with a remote gas-density monitor,
new Circuit-Switchers, with no intervening maintenance performed. interrupters should be checked for low gas pressure (red targets) during
② Frequently operated Circuit-Switchers (typically 200 or more open- the user’s normal day-to-day operating routine.
close operations per year) should be inspected after the first 250 opera­ ★ First inspection at 10 years from delivery, 5 years for Circuit-Switchers
tions; thereafter, they should be inspected at the frequency indicated. between 10 and 20  years old, 3  years for Circuit-Switchers more than
Fre­quently operated Circuit-Switchers also require annual lubrication of
20 years old.
the disconnect live parts. See Table IV on pages 4 and 5.

 S&C Data Bulletin 716-90  3

S&C Series 2000 Circuit-Switchers

DANGER
De-energize and ground the Circuit-Switcher at all six terminals before performing inspection procedures as described on the
following pages. Follow all applicable safety procedures. Failure to de-energize and ground the Circuit-Switcher before
performing inspection procedures can result in serious injury or death.

Table IV—Recommended Inspection Procedures for Series 2000 Circuit-Switcher Components

Component Inspection Procedures

1. Check with your local S&C Sales Office to see if there are any outstanding Field Notifications for inspection, retrofit, or mainte-
nance of your model switch.
General
2. Check overall cleanliness of the insulators, live parts, and operator. If severe contamination is present, power wash with water or
use non-abrasive cleaner. Reapply lubricant to live parts after washing.①

1. Check for evidence of water ingress, wildlife intrusion, damage, excessive corrosion, or wear.
2. Check for loose wiring inside enclosure and proper functioning of position-indicating lamps, operation counter, convenience
lamp, etc.
3. On Circuit-Switchers manufactured between 1998 and July 2007, verify that Solenoid Latch Assembly with Trip Assist Mecha-
nism, Catalog Number SXA-4612-1-A (48 vdc) or SXA-4612-2-A (125 vdc), has been installed. The Trip Assist Mechanism is
Operator visible at the top of the latch assembly as shown below. If it has not been installed on a unit supplied between 1998 and July
2007, plan to retrofit the latch assembly.
4. Perform several test operations. Check electrical operation using trip and close push buttons. Also check the operation using the
manual trip lever. Replace components that don’t work properly or exhibit excessive corrosion.
5. Simulate a fault by activating protective-relay circuit. Check electrical operation.
6. Check key interlocks, if furnished, mechanically and electrically.

① Shell Gadus® S2  U1000  2 Lubricant Catalog Number 9999‑043, is

available in 1 oz. tubes from S&C. Shell Darina SD2, Dow 33, or equivalent
can be substituted.

Trip coil
Retrofit Latch Assembly—for units supplied
between 1998 and July 2007.

Trip coil

Operator—side door.

4  S&C Data Bulletin 716-90

 S&C Series 2000 Circuit-Switchers

Table IV—Recommended Inspection Procedures for Series 2000 Circuit-Switcher Components—Continued

Component Inspection Procedures

A set of spare support columns should be in stock, for use in the event replacement is necessary.
1. Check bottom seal for evidence of leaking lubricated dielectric filler: stains on base, stains on gravel beneath column, and/
or dirt on underside of lower porcelain skirts. Circuit-Switchers supplied through August 1998 are at greater risk of this
condition.
On 161-kV or 230-kV Circuit-Switchers with two-piece insulating support columns, also check seal at middle joint of
column for evidence of leaking lubricated dielectric filler.
Leaking columns on a 161- or 230-kV Circuit-Switcher should be replaced as soon as possible. Consider changing all three
insulating support columns manufactured between 1986 and August 1998 while the unit is out of service. The serial
number will be stamped into the metal base of the column. The column serial numbers are between BB-223-01
(August 1986) and PP-163-06 (May 1998) for these units.
Insulating
A leaking column on a 69-, 115-, or 138-kV Circuit-Switcher does not need to be replaced unless there is evidence of water
Support Column
ingress inside the transition box or Doble readings are above the levels shown in Table V on page 6.
2. Remove the transition box cover at the top of the column and check that pinned connections are secure. Also check for
evidence of water ingress, damage, excessive corrosion, or wear. If there is evidence of water ingress, and the column is
also leaking dielectric fluid, replace the leaking insulator support column and contact S&C for assistance in determining
how the moisture entered the column.
3. On models with integral disconnect, close the disconnect. Check that the rotating-spindle closed-stop bolt on the insulating
support column is within 1/16 inch of the bumper at the bottom of the transition box.
Note: Many utilities have started using Doble testing to verify the integrity of different types of insulation. Although it is not a
recommendation by S&C to perform this type of test, Table V has been provided to show the maximum acceptable test values
for insulating support columns.

1. Remove bottom covers from base and check power train and bumpers for evidence of damage, excessive corrosion, or
Interrupter wear and replace components as needed.
Power Train
2. Check that bolted connections are tight and pinned connections are secure.

1. Check for evidence of damage, excessive corrosion, or wear.

Disconnect
2. Check that bolted connections are tight and pinned connections are secure.
Power Train
3. Check condition of seals.

1. Check for low gas pressure (red indicator).

2. For Circuit-Switchers manufactured from 1986 to 1995, inspect the red target assembly of each interrupter to verify proper
function of the red target. To perform this inspection, obtain the inspection tool kit, SXA-4578, and follow the instructions
per RD-6933. If the inspection determines that the red target is not functioning properly, plan to install a retrofit red target
assembly. Contact your local S&C Sales Office for more information.
Interrupter
Note: If updated red target assembly (kit number SXA-4268R1 for Model 2010, 2030, and 2040, and kit number SXA-4587
for Model 2020) has been installed, this inspection step is not needed. If you would like to obtain this assembly for retrofit,
please contact your local S&C Sales Office.
3. Check that bolted connections are tight on current-carrying parts.
4. If desired, check resistance as indicated in Table VI, Table VII, or Table VIII.

1. Check for evidence of damage, excessive corrosion, or wear.

2. Check that bolted connections are tight on current-carrying parts.
Bypass Accessory
3. Observe operation using stick-operated ratchet mechanism. Check for proper contact alignment.
4. Lubricate contact surfaces with an appropriate lubricant.①

1. Check for evidence of water ingress, damage, excessive corrosion, or wear—especially at the jaw-contact members.
2. Check that bolted connections are tight on current-carrying parts.
Grounding Switch
3. Observe operation using manual operating handle. Check for proper contact alignment.
4. Lubricate the contact surfaces with an appropriate lubricant.①

Remote 1. Replace transmitter batteries at least once every eight years.

Gas-Density Monitor
① Shell Gadus® S2  U1000  2 Lubricant Catalog Number 9999‑043, is
available in 1 oz. tubes from S&C. Shell Darina SD2, Dow 33, or equivalent
can be substituted.

 S&C Data Bulletin 716-90  5

S&C Series 2000 Circuit-Switchers

  DANGER
De-energize and ground the Circuit-Switcher at all six terminals before making Doble test measurements on the insulating
support columns. Follow all applicable safety procedures. Failure to de-energize and ground the Circuit-Switcher before
making Doble test measurements can result in serious injury or death.

Table V—Doble Test Values for Series 2000 Circuit-Switcher Insulating Support Columns—Watts Loss
Voltage, kV Maximum Power Dissipation Factor, Watts

 69 0.16
115 0.13
138 0.13
161 0.10
230 0.10

Note: Many utilities have started using Doble testing to test, Table V has been provided to show the maximum
verify the integrity of different types of insulation. Although acceptable test values for insulating support columns.
it is not a recommendation by S&C to perform this type of

Table VI—Allowable Resistance Values: Series 2000 Circuit-Switcher Model 2010

Continuous Measurement Points, Microhms

Voltage, kV Current,
Amperes 2-3 1-4 1-2★ 3-4★ 4-7▲ 1-5★ 6-7★
 69 220
115 200 260 265
138 1 200 285 75
161 265
240 300 30 30 50
230 285
 69 175
115 2 000 180 240 205 40
138 225
▲ Resistance between points 4 and 7 minus actual resistance of inter-
rupter (between points 2 and 3).

the terminal pads, (points 1 and 4), the bolted connections

  DANGER should be disassembled, and the hardware re-prepared
De-energize and ground the Circuit-Switcher at all six (surfaces cleaned and a high-voltage grease reapplied) and
terminals before making resistance measurements. Follow replaced. If the location of high resistance is across the
all applicable safety procedures. Failure to de-energize interrupter (points 2 and 3), the interrupter should be
and ground the Circuit-Switcher before making replaced.
resistance measurements can result in serious injury
or death. Blade
Perform the measurement between points 4 and 7. Subtract
Interrupter the resistance of the interrupter taken when the interrupter
Perform the measurements between points 2 and 3 and points 2 and 3 were measured. The difference should be
points 1 and 4. If one or more of these measurements is lower than number listed in the “4‑7” column. If the
over the stated resistance values, use the starred “a” resistance is higher than listed, use the starred “★”
measurements to locate the point(s) of resistance. If the measurements to locate the point(s) of high resistance.
resistance is high between the transition box housing and Contact your local S&C Sales Office for assistance.

6  S&C Data Bulletin 716-90

 S&C Series 2000 Circuit-Switchers

Table VII—Allowable Resistance Values: Series 2000 Circuit-Switcher Model 2020

Continuous Measurement Points, Microhms

Voltage, kV Current,
Amperes 2-3 1-4 1-2★ 3-4★ 4-8▲ 1-5★ 6-7★ 7-8★
 69 220
115 1 200 200 300 30 70 265 30 50 40
138 285
▲ Resistance between points 4 and 8 minus actual resistance of inter-
rupter (between points 2 and 3).

the terminal pads, (points 1 and 4), the bolted connections

DANGER should be disassembled, and the hardware re-prepared
De-energize and ground the Circuit-Switcher at all six (surfaces cleaned and a high-voltage grease reapplied) and
terminals before making resistance measurements. Follow replaced. If the location of high resistance is across the
all applicable safety procedures. Failure to de-energize interrupter (points 2 and 3), the interrupter should be
and ground the Circuit-Switcher before making replaced.
resistance measurements can result in serious injury
or death. Blade
Perform the measurement between points 4 and 8. Subtract
Interrupter the resistance of the interrupter taken when the interrupter
Perform the measurements between points 2 and 3 and points 2 and 3 were measured. The difference should be
points 1 and 4. If one or more of these measurements is lower than number listed in the “4-8” column. If the
over the stated resistance values, use the starred “★” resistance is higher than listed, use the starred “★”
measurements to locate the point(s) of resistance. If the measurements to locate the point(s) of high resistance.
resistance is high between the transition box housing and Contact your local S&C Sales Office for assistance.

 S&C Data Bulletin 716-90  7

S&C Series 2000 Circuit-Switchers

Table VIII—Allowable Resistance Values: Series 2000 Circuit-Switcher Models 2030 and 2040

Measurement Points, Microhms

Continuous
Voltage, kV
Current, Amperes 2-3 1-4 1-2★ 3-4★

 69
115 250 310
138 1 200
161
300 360 30 30
230
 69
115 2 000 180 240
138

Interrupter
  DANGER
Perform the measurements between points 2 and 3 and
De-energize and ground the Circuit-Switcher at all six between points 1 and 4. If one or more of these
terminals before making resistance measurements. Follow measurements is over the stated resistance values, use the
all applicable safety procedures. Failure to de-energize starred “★” measurements to locate the point(s) of
and ground the Circuit-Switcher before making resistance. If the resistance is high between the transition
resistance measurements can result in serious injury box housing and the terminal pads, (points 1 and 4), the
or death. bolted connections should be disassembled, and the
hardware reprepared (surfaces cleaned and a high-voltage
grease reapplied) and replaced. If the location of high
resistance is across the interrupter (points 2 and 3), the
interrupter should be replaced.
Printed in U.S.A.

8  S&C Data Bulletin 716-90