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Mark V Circuit-Switchers
Outdoor Transmission (34.5 kV through 161 kV)
Table of Contents
Introduction � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 2
Qualified Persons � � � � � � � � � � � � � � � � � � � � � � � � � � � 2
Read this Instruction Sheet � � � � � � � � � � � � � � � � � � � 2
Retain this Instruction Sheet� � � � � � � � � � � � � � � � � � � 2
Proper Application � � � � � � � � � � � � � � � � � � � � � � � � � � 2
Special Warranty Provisions � � � � � � � � � � � � � � � � � � � 3
Warranty Qualifications � � � � � � � � � � � � � � � � � � � � � � 3
Safety Information � � � � � � � � � � � � � � � � � � � � � � � � 4
Understanding Safety-Alert Messages � � � � � � � � � � � 4
Following Safety Instructions � � � � � � � � � � � � � � � � � � 4
Replacement Instructions and Labels � � � � � � � � � � � 4
Location of Safety Labels � � � � � � � � � � � � � � � � � � � � � 5
Safety Precautions � � � � � � � � � � � � � � � � � � � � � � � 6
November 27, 2023
© S&C Electric Company 1978-2023, all rights reserved
Vertical-Break Style
Installation
Shipping and Handling � � � � � � � � � � � � � � � � � � � � 7
Inspection � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7
Packing � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7
Options and Accessories � � � � � � � � � � � � � � � � � � � � � 9
Handling � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 9
Installation � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 10
Assembly of Individual Pole-Units � � � � � � � � � � � � � �10
Connecting the Optional Shunt-Trip Device � � � � � � �18
Adjusting the Pole-Units � � � � � � � � � � � � � � � � � � � � � �19
Installing the Power Train � � � � � � � � � � � � � � � � � � � � 23
Installing the CS-1A Switch Operator � � � � � � � � � � � 25
Connecting High-Voltage Conductors � � � � � � � � � � 25
Checking the Operation � � � � � � � � � � � � � � � � � � � � � 25
Checking the Optional Shunt-Trip Device � � � � � � � � 26
Before Energizing the Circuit-Switcher � � � � � � � � � � 27
Instruction Sheet 711-510
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Table of Contents
Summary of Contents for S&C Mark V Circuit-Switchers
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Page 1: Table Of Contents
Mark V Circuit-Switchers Outdoor Transmission (34.5 kV through 161 kV) Vertical-Break Style Installation Table of Contents Introduction � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 2 Shipping and Handling �... -
Page 2: Introduction
Introduction Qualified WARNING Persons Only qualified persons who are knowledgeable in the installation, operation, and maintenance of overhead and underground electric transmission and distribution equipment, along with all associated hazards, may install, operate, and maintain the equipment covered by this publication�... -
Page 3: Special Warranty Provisions
Special The standard warranty contained in the seller’s standard conditions of sale, as set forth in Price Sheet 150, applies to Mark V Circuit-Switchers and accessories and associated switch operators, Warranty except the first paragraph of the said warranty is replaced by the following:... -
Page 4: Safety Information
Safety Information Understanding Several types of safety-alert messages may appear throughout this instruction sheet and on labels and tags attached to the Mark V Circuit-Switcher. Become familiar with these types of messages Safety-Alert and the importance of these various signal words: Messages DANGER “DANGER”... -
Page 5: Location Of Safety Labels
Safety Information Location of Safety Labels Reorder Information for Safety Labels Location Safety Alert Message Description Part Number WARNING Interrupter pressurized to 38 PSI� Install protective shields prior to removal� G-9686 Instruction Interrupter Part Number� Replace with catalog number��� G-6376 CAUTION This shield must be removed during installation-- but only when indicated���... -
Page 6: Safety Precautions
Safety Precautions DANGER Mark V Circuit-Switchers operate at high voltage� Failure to observe the precautions below will result in serious personal injury or death� Some of these precautions may differ from company operating procedures and rules� Where a discrepancy exists, follow your company’s operating procedures and rules�... -
Page 7: Shipping And Handling
Shipping and Handling Inspection (a) Interphase shafts and connecting shafts of 21/2- inch IPS pipe are furnished if the distance from the Examine the shipment for external evidence of damage as gearbox to the farthest pole-unit is 25 feet (7.62 m) soon after receipt as possible, preferably before removal or less. - Page 8 Shipping and Handling Instructions in water- resistant envelope Disconnect blade Interrupter Pole-unit base Brain Box for hardware Container for shunt-trip Skid insulated operating shaft Figure 1� Pole-unit on skid� Yellow Gray (Open) (Closed) Gas-pressure indicator (gray) Figure 2� Interrupter Target� Figure 3�...
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Page 9: Options And Accessories
Shipping and Handling Options and Accessories Handling NOTICE Shunt-Trip Device High-Speed tripping of power-operated Mark V Circuit- Do not intermix components from different Switchers is furnished by the S&C Shunt-Trip Device. installations This optional accessory (circuit-switcher catalog number S&C maintains an historical record, by serial number, suffix “-T1”... -
Page 10: Installation
Installation Assembly of Individual Pole-Units (b) As opening continues, the stored-energy source charges and latches, and a final STEP 1� Without removing the circuit-switcher pole-units peaking of effort again is required as the from their skids, arrange them in the position drive-shaft crank goes into toggle against and order in which they will be raised onto the open stop. - Page 11 Installation Corona control—provided at 115 kV through 161 kV Operating link Temporary hand- operation adapter Drive-shaft assembly Rotating-insulator lever Toggle-loading Drive-shaft snubbers (2) crank stops Drive-shaft (not visible) crank Figure 4� Overview of parts of Mark V Circuit-Switcher pole-unit and attaching the temporary hand-operation adapter� S&C Instruction Sheet 711-510...
- Page 12 Installation STEP 4� Each circuit-switcher pole-unit brain, with its associated base-integrated power train, is factory-adjusted to provide the sequence control necessary to ensure positive latching Factory-set ½–13 X 2 ¾-inch of the stored-energy source within the brain and stop bushing positioning bolt precisely timed opening of the interrupters.
- Page 13 Installation STEP 5� Remove the brain-and-interrupter assembly from (c) Hoist the brain-and-interrupter assembly and the insulator-mounting supports, following this set it aside on a clean surface. Do not permit procedure: the assembly to rest on the shunt-trip shaft extending from the brain (if applicable). (a) Attach lifting slings in the manner shown in Figure 7.
- Page 14 Installation STEP 7� Assemble the insulator stacks directly on (c) Make a mark on the cord at the point where their insulator supports, using the galvanized it crosses the center point of the rotating- hardware specified in Figure 8. insulator stack. STEP 8�...
- Page 15 Installation (e) Torque to final tightness all insulator-stack rotating-insulator stack to the center point cap screws, including those fastening the of the rear-insulator stack. This measure- insulator stacks to the insulator supports. ment must be within 1/8 inch (3.2 mm) of the dimension shown on the erection drawing.
- Page 16 Installation STEP 11� Check the alignment of the front-insulator stack (b) Lift the brain-and-interrupter assembly into by means of a cord stretched taut across the top position on its respective insulator stacks, of the insulator stacks. The cord should cross the using the same handling care that was center points of all three insulator stacks and cautioned for its removal.
- Page 17 Installation in the insulator caps without effectively STEP 15� Bolt the circuit-switcher pole-units in place using tightening. See. Figure 10 on page 16. Then, 5/8-inch (16-mm) galvanized bolts, flat washers, torque to final tightness, in order, the inter- lockwashers, and nuts (furnished only if so speci- rupter cap screws at the terminal end, the fied on the order).
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Page 18: Connecting The Optional Shunt-Trip Device
Installation Connecting the Optional Shunt-Trip Device If the optional shunt-trip device has been specified, the insulated operating shafts should be installed at this time on circuit-switchers rated 69 kV and up. The necessary conduit—with control wiring of recommended size—should be in place, although the control wiring for the shunt-trip solenoids should be left disconnected at the switch-operator end until Step 5 on page 26 has been completed. -
Page 19: Adjusting The Pole-Units
Installation Adjusting the Pole-Units STEP 1� Make a final check of each circuit-switcher pole-unit for adjustment and alignment of the blade with the jaw-contact assembly. As each circuit-switcher blade is closed, the fault-closing tongue contact should engage each of the fault- closing jaw contacts with equal pressure and the Current-carrying current-carrying tongue contacts should enter... - Page 20 Installation With the drive-shaft crank in the fully Open toggle position described, the blade crank-arm Insulator at the top of the brain should rest against its open stop, thus assuring a positive Closed and Latched position of the interrupter. See Figure 15.
- Page 21 Installation STEP 3� With the hand-operation adapter, operate each circuit-switcher pole-unit to its fully Closed Blade position. See Figure 16. The drive-shaft crank crank arm should rest firmly in a toggle position against an internal drive-shaft crank stop in the drive-shaft Closed assembly.
- Page 22 Installation (d) Replace the rotating-yoke coupling pin and, STEP 4� Become familiar with the parts of the blade mech- if no further adjustment is required, also anism as seen in Figure 17 on page 21. Check each replace the cotter pin. circuit-switcher pole-unit for adequate pene- tration of the blade into the jaw contact during (e) Before tightening the rotating-yoke lock nut,...
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Page 23: Installing The Power Train
Installation Installing the Power Train Clamp bolts (2) Install the gearbox in the position shown on the STEP 1� erection drawing. Note: To ensure proper installation the align- ment arrow on the gearbox should be positioned as indicated on the erection drawing. NOTICE To ensure the integrity of the operating mechanism, it is imperative careful attention be... - Page 24 Installation Piercing set screws (2) Rigid coupling Interphase shaft Clamp bolts (2) Flexible Arrow on hub of gearbox to be coupling oriented as indicated on the Piercing set erection drawing screws (2) Piercing set Vertical shaft screws (2) Coupling flange Clamp bolts (2) Clamp bolts (2)
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Page 25: Installing The Cs-1A Switch Operator
Installation Installing the CS-1A Switch Operator NOTICE STEP 1� Mount the switch operator as indicated on the To avoid damage to the circuit-switcher and switch erection drawing. operator, electrical operation of the switch operator When more than one switch operator is avail- should not be attempted until its travel-limit discs have able, be sure to select the one intended for the been properly adjusted as described in S&C Instruction... -
Page 26: Checking The Optional Shunt-Trip Device
Installation STEP 3� Check for simultaneous closing of the three pole- (a) Check for simultaneity by slowly opening units by visually determining engagement of the the circuit-switcher (by manually cranking fault-closing contacts. Check each pole-unit for the switch operator). Listen for the tripping proper blade penetration and readjust if neces- action of the individual interrupters, and sary, as described in Step 4 on page 22. -
Page 27: Before Energizing The Circuit-Switcher
Installation Before Energizing the Circuit-Switcher Remove the container from each interrupter as follows: 3/8—16 X 7/8-inch and two 3/8—16 X 1-inch STEP 1� Remove and discard the 3/8–16 zinc-plated serrated zinc-plated hex-head cap hex nuts which run the length of the container. See screws and flat washers Figure 22.
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