Data Bulletin 712-90 [English, 120 KB, 7/16/2012]

Data Bulletin 712-90 [English, 120 KB, 7/16/2012]
S&C Circuit-Switchers — Mark VI
Inspection Recommendations
To ensure Mark VI Circuit-Switcher’s continued proper
performance, it should be inspected in accordance with
the recommended schedule and procedures contained in
the tables of this publication. Table I indicates the fre­
quency with which each major Circuit-Switcher
compo­
nent should be inspected and Table II lists a
summary of inspection procedures appropriate for each
component.
The actual number of open-close operations which may
be obtained for a component in service will depend upon
the nature of the application, the installation envi­ronment
(e.g., whether subject to temperature or humid­
ity
extremes, or highly corrosive or dusty atmospheres), and
the observance of the recommended inspection schedule.
An inspection frequency is shown for each component
listed. To maximize the operating life of the component, it
is recommended that the user perform the inspection pro­
cedures described in Table II, at the frequency indicated by
a “d”—either in number of open-close operations or years,
whichever occurs more often. If the inspection results so
indicate—or if dictated by the mechanical-oper­ations test
value or electrical-operations limit guideline—the component should be replaced. Each user’s own expe­rience will
determine whether more frequent inspections are required.
Outdoor Transmission (69 kV through 138 kV)
Table I—Recommended
Inspection Schedule
A mechanical-operations test value is indicated in Table I
for the Circuit-Switcher components affected by the number of mechanical operations performed. It is offered as a
guideline to the number of open-close operations which
might reasonably be expected before replacement is
required.
Electrical-operations limits are also listed for the inter­
rupter and disconnect live parts, since these components
are affected by the number of electrical operations per­
formed. These limits are dependent upon the CircuitSwitcher application and magnitude of current switched.
For the interrupter and disconnect live parts, the electri­
cal-operations limit may thus provide an overriding guide­
line to the number of open-close operations which might
be expected before replacement is required.
July 16, 2012© S&C Electric Company
Table II—Recommended
Inspection Procedures
The Circuit-Switcher inspection procedures to be fol­lowed
are summarized in Table II. The applicable S&C instruction
sheets for the Circuit-Switcher, pre-insertion inductor,
grounding switch, etc., should be referenced for further
details.
Data Bulletin 712-90
S&C Circuit-Switchers — Mark VI
TABLE I—RECOMMENDED INSPECTION SCHEDULE FOR S&C CIRCUIT-SWITCHER COMPONENTS
Component
MechanicalOperations
Test Value1,
Number of
Open-Close
Operations
Switch Operator and
Power Train
Interrupter
5 000
Disconnect Live Parts
5 000
—
—
—
d
d
Transformer or
Capacitor
Switching
420
5 000
d
dj
31 000
3
18 900
5
  9 450
10
  3 150
30
—
—
—
d
d
Transformer or
Capacitor
Switching
420
5 000
d
d
Fault Closing
30 000
2
Pre-Insertion Inductor
—
—
—
—
Grounding Switch
—
—
—
—
1 Based on mechanical-operations tests performed by S&C utilizing
new Circuit-Switchers, with no intervening maintenance performed.
2 Frequently operated Circuit-Switchers (typically 200 or more openclose operations per year) should be inspected after the first 250
opera­tions; thereafter, they should be inspected at the frequency indicated. Fre­
quently operated Circuit-Switchers also require annual
lubrication of the disconnect live parts. See Table II.
2 S&C Data Bulletin 712-90
Number of
Years
Number of
Open-Close
Operations
5 000
5 000
Number of
Open-Close Operations
Maximum
Current,
Amperes
Application
Fault
Interrupting
Interrupter Charging Motor
Inspection Frequency2
Electrical-Operations Limit
d
1 or 2
250
2 500
1
5
Not applicable
Not
applicable
d
d
d
d
Recommended inspection frequency.
 Frequently operated Circuit-Switchers equipped with pre-insertion
inductors require annual cleaning of the inductor windings. See Table II.
j The gas-pressure gauge on the underside of each interrupter should
be checked for low gas density during the user’s normal day-to-day oper­
ating routine.
S&C Circuit-Switchers — Mark VI
TABLE II—RECOMMENDED INSPECTION PROCEDURES FOR S&C CIRCUIT-SWITCHER COMPONENTS
Component
General
Switch Operator
Inspection Procedures
1. Check with your local S&C Sales Office for any outstanding Field Notifications for inspection, retrofit, or maintenance on
your model switch.
2. Check the switch for overall cleanliness of the insulators, live parts, and operator. Power washing with water or a
non-abrasive cleaning method should be performed for severe contamination. Reapply lubricant to the live parts after
washing.
1.
2.
3.
4.
Check for evidence of water ingress, damage, excessive corrosion, or wear.
Check ease of operation during slow, manual cranking using the switch operator manual operating handle.
Check electrical operation, coupled and decoupled.
Check for loose wiring inside enclosure and proper functioning of position-indicating lamps, operation counter, conve­
nience lamp, etc.
5. Check operation of brake and readjust if necessary.
Power Train
1. Check for evidence of damage, excessive corrosion, or wear.
2. Check tightness of fasteners.
3. Observe operation during slow, manual cranking using the switch operator manual operating handle. Check for complete
stroking of the various drive levers against their stops and for attainment of overtoggle positions, as required.
4. Check condition of seals.
Interrupter1
1.
2.
3.
4.
5.
Interrupter
Charging Motor
1. Check for evidence of water ingress, damage, excessive corrosion, or wear.
2. Check tightness of fasteners—especially at the connection between the motor and the interrupter operating shaft.
3. Check alignment of the connection between the interrupter and the charging motor. The hook that secures the motor to the
interrupter should move freely.
Disconnect
Live Parts
1. Check for evidence of damage, excessive corrosion, or wear—especially at the fault-closing contacts and current-carry­ing
contacts. Replace current-carrying jaw contacts if the silver-alloy inserts on two or more contact fingers are worn to the
extent that the blade tongue contact engages the full width of the contact finger.
2. Check tightness of fasteners on current-carrying parts.
3. Observe operation during slow, manual cranking using the switch operator manual operating handle. Check for proper
contact alignment.
4. Lubricate the contact surfaces with an appropriate lubricant. 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.
5. Check for excessive corrosion at the terminal pad and interrupter-to-disconnect bus.
6. Check for evidence of excessive terminal-pad loading.
Pre-Insertion Inductor
1. Clean the exterior finish of inductor windings using mild soap and water solution and a soft cloth. Inspect the fiberglass
roving for damage or wear. Use a mild soap and water solution and a clean cloth to clean the exterior finish of the inductor
winding. While cleaning the windings, inspect for damage or exposure of the fiberglass roving.
2. If the fiberglass roving is damaged, use the touch-up kit, S&C Catalog Number SA‑42721, to refinish any damaged
surfaces. First, thoroughly wire-brush the surface to be refinished. Then, sand with No. 1 sandpaper and No. 0 sandpaper
to create a smooth surface. Brush on the paint according to the directions on the label, and dry for six hours. If the coiled
conductor beneath the fiberglass roving is exposed, remove the inductor from service and contact your nearest
S&C Sales Office for a replacement.
3. Inspect the moving and stationary arcing rods to verify their proper setting. Replace the arcing rods if they show significant
wear or erosion.
Grounding Switch
1.
2.
3.
4.
Check gas-pressure gauge (on underside) for low gas density.
Check tightness of fasteners on current-carrying parts.
Check for discoloration, contamination, or other damage to the interrupter insulation.
Check for excessive corrosion at the terminal pad and interrupter-to-disconnect bus.
Check for evidence of excessive terminal-pad loading.
Check for evidence of damage, excessive corrosion, or wear—especially at the jaw contacts.
Check tightness of fasteners on current-carrying parts.
Observe operation using manual operating handle. Check for proper contact alignment.
Lubricate the contact surfaces with an appropriate lubricant. 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.
1 Mark VI Circuit-Switcher interrupters should have resistance values
under 200 micro-ohms when new, and under 500 micro-ohms when in
service. If an interrupter has a resistance value outside this range, contact
your nearest S&C Sales Office.
S&C Data Bulletin 712-90 3
Printed in U.S.A.
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