Siemens GM-SG-AR Instruction Manual
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Siemens GM-SG-AR Instruction Manual

Siemens GM-SG-AR Instruction Manual

Arc-resistant, metal-clad, medium-voltage switchgear
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INSTRUCTION MANUAL
GM-SG-AR
Arc-resistant, metal-clad, medium-voltage switchgear
usa.siemens.com/mvswitchgear

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Summary of Contents for Siemens GM-SG-AR

  • Page 1 INSTRUCTION MANUAL GM-SG-AR Arc-resistant, metal-clad, medium-voltage switchgear usa.siemens.com/mvswitchgear...
  • Page 2 Further, a qualified person shall also be familiar with the application, installation, operation, and maintenance of the proper use of special precautionary techniques, personal equipment purchased. Siemens reserves the right to make protective equipment, insulation and shielding materials, changes in the specifications shown herein or to make and insulated tools and test equipment.

  • Page 3: Table Of Contents

    Instruction manual | GM-SG-AR medium-voltage switchgear Arc flash and explosion hazard. Will cause death, serious injury or property damage. This equipment is not arc-resistant unless all of the following conditions are met: 1. All pressure relief devices are free to operate as designed.

  • Page 4: Instruction Manual

    Introduction (starting on page 94), using the portable electrical- The type GM-SG-AR family of 5 kV - 27 kV metal- racking accessory. The switchgear is also available clad, arc-resistant switchgear is designed to meet with built-in electric racking in the circuit breaker all applicable NEMA and IEEE standards.
  • Page 5 Contact regional service centers, sales offices or the factory for details, or telephone Siemens field Warning - Indicates a potentially hazardous service at +1 (800) 333-7421 or +1 (423) 262-5700 situation which, if not avoided, could result in death outside the U.S.

  • Page 6: General Description

    GM-SG-AR medium-voltage switchgear | Instruction manual General description Introduction Note: Enclosures used to couple type GM-SG-AR to The successful performance and application of other equipment (for instance, transition sections, metal-clad switchgear depends as much on proper transformer throats, bus ducts, etc.) as well as...
  • Page 7 Special mechanical and electrical devices, furnished in accordance with purchase order requirements, are Figure 1:Typical indoor type GM-SG-AR metal-clad, arc-resistant switchgear covered by supplementary instructions submitted with this instruction manual. General description...
  • Page 8 3. The top mounted pressure relief channel (PRC) equipment. and exhaust plenum assemblies must be properly installed. Note: Enclosures used to couple type GM-SG-AR to other equipment (for example, transition sections, Important: Exhaust plenum must be routed outside transformer throats, bus ducts, etc.) as well as...
  • Page 9 Instruction manual | GM-SG-AR medium-voltage switchgear relays, instruments and similar devices and may be Shelter-Clad+ outdoor equipment consists of indoor opened to provide access to secondary control equipment enclosed in a weather-resistant housing equipment. Generally, when the primary complete with a walk-in aisle, an exhaust system to...

  • Page 10: Receiving, Handling, And Storage

    Receiving, handling, and storage Receiving The use of sledge hammers and crowbars may Each group of type GM-SG-AR metal-clad, arc- damage the finish, or the equipment itself. Use nail resistant switchgear is securely blocked and braced pullers. After unpacking, examine equipment for for shipment.
  • Page 11 Siemens is not 6. Be sure equipment is properly protected from held liable for repairs. Siemens is not held liable for any further damage by covering it properly after repairs in any case where repair work was unloading.

  • Page 12: Lifting And Moving

    GM-SG-AR medium-voltage switchgear | Instruction manual Lifting and moving Item Description Spreader beams There are a number of methods that can be used in handling the switchgear that, when properly employed, will not damage the switchgear sections. The handling method used will be determined by conditions and available equipment at the installation site.
  • Page 13 Instruction manual | GM-SG-AR medium-voltage switchgear Item Description Spreader beams 26.0 (178) (660) (178) Lifting points One unit 7.0 (178) 66.0 (1,676) 7.0 (178) Lifting points Ø1.25 typical Two units Left end of shipping group 124 (3,159) 56.05 (1,424) 29.27 (743) Lifting points 21.05...
  • Page 14 GM-SG-AR medium-voltage switchgear | Instruction manual Indoor switchgear Before removing the protective packing materials, indoor equipment may be moved by crane with lift cables attached through the packaging to the lifting bars on the top of the switchgear. If crane facilities are unavailable, or if tight spaces prevent use of a crane, rollers under the skids may be used.
  • Page 15 Instruction manual | GM-SG-AR medium-voltage switchgear Lifting outdoor switchgear with crane Slide carefully TThe method of lifting Shelter-Clad outdoor Previously up to 6" (152 mm) positioned equipment is shown in Figure 5: Lifting outdoor on smooth, switchgear. unobstructed floor. Shelter-Clad switchgear with crane on page 14 for...
  • Page 16 GM-SG-AR medium-voltage switchgear | Instruction manual 7. The equipment may be slid sideways up to 6” (152 Item Description Spreader beams mm) to join the shipping split. Any sliding force Lift pipes must be carefully applied across the bottom 4”...
  • Page 17 Instruction manual | GM-SG-AR medium-voltage switchgear Storage: type GMSG vacuum circuit breakers, Item Description ground and test devices and lift truck Spreader beams Vacuum circuit breakers and ground and test devic- es, if not installed in their respective switchgear compartments, must be stored indoors. Outdoor...

  • Page 18: Installation

    GM-SG-AR medium-voltage switchgear | Instruction manual Installation Preparation for installation openings on the switchgear and the enclosure or Prior to installation of switchgear, study this other obstructions. instruction manual and the switchgear drawings, Horizontal clearance from the indoor arc-resistant such as general arrangement, three-line diagram,...
  • Page 19 Figure 7: Anchoring and at shipping splits, so that the span between indoor type GM-SG-AR switchgear on page 19. The supports does not exceed 80" (2,032 mm). surface of the sills should be slightly above floor level.
  • Page 20 GM-SG-AR medium-voltage switchgear | Instruction manual Figure 8: Anchoring outdoor type SGM-SG-AR For Shelter-Clad+ switchgear, the aisle and Shelter-Clad (single-aisle) switchgear on pages switchgear are shipped attached to each other on a 21-24 shows the method of anchoring outdoor common base. For Shelter-Clad+ switchgear, refer to Shelter-Clad (walk-in) switchgear.
  • Page 21 40.0 [1016.0] 3.21 [81.5] See detail 3 Typical width of GM-SG-AR Detail 3 4.28 [108.6] Front door (Plan view) of switchgear Conduits in See detail 2 Detail 1 downfeed application Figure 7a: Anchoring indoor type GM-SG-AR switchgear rated up to 17.5kV...
  • Page 22 (178) (178) 2.38 (60) 2.38 (60) 2.38 (60) 2.38 (60) 11.9 11.9 (302) (302) Front view Circuit breaker withdrawal area Circuit breaker withdrawal area Plan view Plan view Figure 7a: Anchoring indoor type GM-SG-AR switchgear rated up to 17.5kV (continued)
  • Page 23 40.0 [1016.0] 3.63 [92.2] See detail 3 Typical width of GM-SG-AR Detail 3 4.39 [111.5] (Plan view) Front door of switchgear Conduits in See detail 2 Detail 1 downfeed application Figure 7b: Anchoring indoor type GM-SG-AR switchgear rated up to 27kV...
  • Page 24 (178) (178) 2.25 (57.2) 2.25 (57.2) 1.75 (44.5) 1.75 (44.5) 11.6 11.6 (295) (295) Front view Circuit breaker withdrawal area Circuit breaker withdrawal area Plan view Plan view Figure 7b: Anchoring indoor type GM-SG-AR switchgear rated up to 27kV (continued)
  • Page 25 Instruction manual | GM-SG-AR medium-voltage switchgear Item Description The switchgear equipment represented was accurately aligned at the factory. This care ensures proper operation and fit of mating parts. Support surfaces for the switchgear must be level and in the same plane within 1/16 (1.52). If concrete, grouted sill channels, columns, pier supports, etc., do not meet this requirement or if there are any projections higher than the support points and in line with the support...
  • Page 26 GM-SG-AR medium-voltage switchgear | Instruction manual Seismic Example: Shipping group 1 Shipping group 2 Switchgear lineup of seven sections with a three-section shipping group and a four- section shipping group supported on columns. Switchgear must be anchored at each end,...
  • Page 27 Instruction manual | GM-SG-AR medium-voltage switchgear Item Description The switchgear equipment represented was accurately aligned at the factory. This care ensures proper operation and fit of mating parts. Support surfaces for the switchgear must be level and in the same plane within 1/16 (1.52). If concrete, grouted sill channels, columns, pier supports, etc., do not meet this requirement or if there are any projections higher than the support points and in line with the support...
  • Page 28 GM-SG-AR medium-voltage switchgear | Instruction manual Non-seismic Example: Shipping group 1 Shipping group 2 Switchgear lineup of seven sections with a three-section shipping group and a four- section shipping group supported on columns. Switchgear must be anchored at each end,...
  • Page 29 Instruction manual | GM-SG-AR medium-voltage switchgear Item Description The switchgear equipment represented was accurately aligned at the factory. This care ensures proper operation and fit of mating parts. Support surfaces for the switchgear must be level and in the same plane within 1/16 (1.52). If concrete, grouted sill channels, columns, pier supports, etc., do not meet this requirement or if there are any projections higher than the support points and in line with the support...
  • Page 30 GM-SG-AR medium-voltage switchgear | Instruction manual Seismic Example: Shipping group 1 Shipping group 2 Switchgear lineup of seven sections with a three-section shipping group and a four- section shipping group supported on columns. Switchgear must be anchored at each end,...
  • Page 31 Instruction manual | GM-SG-AR medium-voltage switchgear Item Description The switchgear equipment represented was accurately aligned at the factory. This care ensures proper operation and fit of mating parts. Support surfaces for the switchgear must be level and in the same plane within 1/16 (1.52). If concrete, grouted sill channels, columns, pier supports, etc., do not meet this requirement or if there are any projections higher than the support points and in line with the support...
  • Page 32 GM-SG-AR medium-voltage switchgear | Instruction manual Non-seismic Example: Shipping group 1 Shipping group 2 Switchgear lineup of seven sections with a three-section shipping group and a four- section shipping group supported on columns. Switchgear must be anchored at each end,...
  • Page 33 Instruction manual | GM-SG-AR medium-voltage switchgear For up to 50 kA 63 kA (additional bolting locations) NOTE: connection bolts are used in highlighted locations Actual quantity and location of connection bolts varies depending on specific equipment included in each cubicle.
  • Page 34 The six anchor bolt Figure 10: Throat connection locations (refer to Figure 7: Anchoring indoor type GM-SG-AR switchgear on page 19) in each 3. If the lineup consists of multiple groups, cubicle must freely rest in firm contact with the remove the interunit hardware that was supplied mounting support surfaces.
  • Page 35 Figure 7: Anchoring indoor type GM-SG-AR switchgear on page 19. 6. After installation is complete, the lifting bar between units must be removed and the lift plates must be either pushed down inside the units or removed from the units.
  • Page 36 GM-SG-AR medium-voltage switchgear | Instruction manual Heavy weight. Can result in death, serious injury or property damage. Observe all handling instructions in this instruction manual to prevent tipping or dropping of equipment. Assembling and installing the exhaust plenum Connecting the exhaust plenum to the...
  • Page 37 Instruction manual | GM-SG-AR medium-voltage switchgear 3. Insert the second plenum section into the 3. From outside of the building exterior wall, pass interface flange of the first plenum section the plenum exit section through the wall and making sure the inner plates of the interface...
  • Page 38 Figure 14: Installation of exhaust plenum exit on page 31. The plenum supports are not supplied by Siemens and must be supplied by the purchaser or the installing contractor. Item...
  • Page 39 Instruction manual | GM-SG-AR medium-voltage switchgear Item Description The detail below shows the minimum recommended clearance Exhaust plenum section from the exhaust plenum exit. When the equipment is operating, 24 3/8-16 hardware this area should be kept clear of personnel and/or combustible or flammable materials.
  • Page 40 GM-SG-AR medium-voltage switchgear | Instruction manual Anchoring, leveling and assembling outdoor The aisle sections should not be placed in position Shelter-Clad switchgear until all of the switchgear structures sections have In Shelter-Clad arrangements, the switchgear (as been placed and the interconnections made.
  • Page 41 Instruction manual | GM-SG-AR medium-voltage switchgear Outdoor switchgear groups that have been Check that the cubicles are in firm contact assembled on a 6” (162 mm) base must be with the supports and anchor points and supported along this base with a span between that bolt holes for interconnections (refer to support points not exceeding 72”...
  • Page 42 GM-SG-AR medium-voltage switchgear | Instruction manual 2d. Join the roof panels and install roof cap 4. Installing the left-side aisle shipping section. (refer to Figure 8 of Figure 15: Instructions 4a. Refer to Figure 13 of Figure 15: Instructions for factory-assembled-aisle type SGM-SG-AR for factory-assembled-aisle type SGM-SG-AR on pages 36-40).
  • Page 43 Instruction manual | GM-SG-AR medium-voltage switchgear 5. After all groups have been bolted together and permanently anchored in place, apply asphalt or epoxy grout between the foundation and the cubicle base around the entire perimeter of the equipment. This will provide a seal between the...
  • Page 44 GM-SG-AR medium-voltage switchgear | Instruction manual Figure 1: Assembled type SGM-SG-AR Figure 3: Right-side equipment shipping section installation Circuit breaker drawout side Figure 2: Four shipping sections shown Install after all equipment sections have been installed. Install last. Item Description...
  • Page 45 Instruction manual | GM-SG-AR medium-voltage switchgear Figure 4: Anchoring at rear of equipment Figure 6: Anchoring at circuit breaker drawout side (front) Seismic anchoring shown, non-seismic anchoring similar, except for position of anchor bolts and use of clamping bars. Refer to order general arrangement for specific anchoring...
  • Page 46 GM-SG-AR medium-voltage switchgear | Instruction manual Figure 7: Left-side equipment shipping section installation Item Description Two 3/8-16 hardware Temporarily remove cover to access roof-panel hardware Reinstall roof panel after interunit assembly Rear roof-supports joint/four 3/8-16 hardware Refer to interunit bolting...
  • Page 47 Instruction manual | GM-SG-AR medium-voltage switchgear Figure 10: Roof eave installation Figure 11: Right-hand aisle shipping section installation Figure 12: Right-hand side shown/left-hand side same Item Description Right-side aisle shipping section Anchor bolts Foundation Sealant strip Equipment roof Aisle roof panel...
  • Page 48 GM-SG-AR medium-voltage switchgear | Instruction manual Figure 13: Left-hand aisle shipping section installation Figure 14: Joining aisle sections Figure 15: Deflector installation Figure 16 shows the minimum recommended clearance from the exhaust plenum exit. When the equipment is operating, this area should be kept clear of personnel and/or combustible or flammable materials.
  • Page 49 Instruction manual | GM-SG-AR medium-voltage switchgear Hazardous voltage. Will cause death, serious injury and property damage. Do not contact energized conductors. De-energize and ground high-voltage conductors before working on or near them. Expanding length of existing Shelter-Clad Certain items will be removed from the existing...
  • Page 50 GM-SG-AR medium-voltage switchgear | Instruction manual 9b. Temporarily remove roof caps, aisle-end roof 11. Reinstalling the equipment section end trim and panel (46.5” (1,181 mm) width) and roof eave roof panels (refer to Figure 4 of Figure 16: Type (46.5” (1,181 mm) width).
  • Page 51 Instruction manual | GM-SG-AR medium-voltage switchgear 12. Installing the new aisle shipping section (refer 14. Drill cable entrance covers to suit conduit to Figures 5 and 6 of Figure 16: Type SGM- installation. Bolt the covers in place. All primary SG-AR expansion on pages 44-45).
  • Page 52 GM-SG-AR medium-voltage switchgear | Instruction manual Figure 1: Removal of existing end-unit panels Figure 2: Removal of existing end-unit panels Figure 3: Installation of new (added) equipment units Item Description Remove roof caps Remove equipment end-roof panel (46.5" (1,181 mm) width) Remove aisle-end roof panel (46.5"...
  • Page 53 Instruction manual | GM-SG-AR medium-voltage switchgear Figure 4: Installing equipment section end-trim and roof panels Figure 5: Installing new (added) aisle sections Figure 6: Installing new (added) aisle sections Item Description Remove roof caps Remove equipment end-trim panels Reinstall front-cover panels...

  • Page 54: Electrical Connections

    GM-SG-AR medium-voltage switchgear | Instruction manual Electrical connections Hazardous voltages. Will cause death, serious injury or property damage. Do not contact energized conductors. Always de-energize and ground high-voltage conductors before working on or near them. Bus bar Bus joints Bus bar is furnished for connection between many...
  • Page 55 Instruction manual | GM-SG-AR medium-voltage switchgear If acccess to the main bus is impeded by installed 4. Observe the relationship of the bus bar to the equipment, access to the main bus can usually be circuit breaker riser (for example, whether bus...
  • Page 56 GM-SG-AR medium-voltage switchgear | Instruction manual 8. Torque the 1/2"-13 SAE Grade No. 5 cap screws The IEEE requirements for bus insulation in metal- to 50-75 lb-ft (68-102 Nm) torque. (If special clad switchgear are contained in IEEE C37.20.2 hardware is required by an order, other torque clause 7.9, which reads as follows:...
  • Page 57 Instruction manual | GM-SG-AR medium-voltage switchgear Side view Rear view Porcelain or cycloaliphatic epoxy bus support (grommet/ inserts optional) Glass-polyester support Insulation boot Typical rating (4,000 A) (3,000 A) (1,200 A or 2,000 A) Grommet/insert Main bus bar Bus riser Note: For illustration only shown with three bars in phase A and two in phase B and one in phase C for connection to breaker cells in lower and upper compartments.
  • Page 58 GM-SG-AR medium-voltage switchgear | Instruction manual Side view Rear view Molded glass-polyester support or optional high track resistance material support Insulation boot Typical rating (4,000 A) (3,000 A) (1,200 A or 2,000 A) Main bus bar Note: For illustration only shown with three bars in phase A and two in phase B and one in phase C. Illustration depicts arrangement with standard molded glass-polyester bus support or optional high track-resistance molded bus support, or optional high track- resistance material support.
  • Page 59 Instruction manual | GM-SG-AR medium-voltage switchgear Connection to top compartment shown dashed Spacer if no circuit breaker in upper cell Breaker riser (typical) Main riser (typical) One main bus bar Two main bus bars Three main bus bars One main bus bar...
  • Page 60 GM-SG-AR medium-voltage switchgear | Instruction manual Remove the backing covering the adhesive, and press adhesive side up (away from conductor) and mold in place covering all sharp projections. Cover hardware and sharp edges of bus bar if any will be against the tape.
  • Page 61 Instruction manual | GM-SG-AR medium-voltage switchgear Item Description Connection bolts minimum four 1/2" diameter Grommet Bolting cavity allows for full overlap of tap or splice plate and for any number of connection bolts used Boot closing flaps secured with nylon hardware...
  • Page 62 GM-SG-AR medium-voltage switchgear | Instruction manual A. Shipping split, as shipped. Insulation B. Shipping split assembly in progress. C. Insulation boots have been reinstalled. Unit boots are factory installed in correct Insulation boots have been removed and is ready for reinstallation of main bus location.
  • Page 63 Instruction manual | GM-SG-AR medium-voltage switchgear Primary cable connections All cable connections to metal-clad switchgear must be fully insulated to comply with the IEEE C37.20.2 definition of metal-clad switchgear. Insulation of terminations reduces the likelihood of occurrence of arcing faults. In addition, insulation of termina- tions is required to maintain the dielectric withstand capability of the installed equipment.
  • Page 64 GM-SG-AR medium-voltage switchgear | Instruction manual Ground connections Note: Dimensions are for A common ground bus is incorporated in all units reference only and are in inches (mm). Size and location of stress for properly grounding the equipment after cone as recommended by cable installation.
  • Page 65 Instruction manual | GM-SG-AR medium-voltage switchgear Rear view (bottom cable) Side view (top cable) Item Description Voltage 4.76 kV 8.25 kV and 15 kV 27 kV Phase-to-phase Phase-to-phase Phase-to-phase 1.75" (44 mm) minimum 3.25” (83 mm) min. 5.75” (146 mm) min.
  • Page 66 GM-SG-AR medium-voltage switchgear | Instruction manual Type Type GMSG GMSG circuit circuit breaker breaker Type Type GMSG GMSG circuit circuit breaker breaker A. Two feeder circuit breakers. Cables bottom exit. B. Two feeder circuit breakers. Cables top exit. C. Two circuit breakers. Upper cables top D.
  • Page 67 Instruction manual | GM-SG-AR medium-voltage switchgear Front of unit Item Description Right rear side sheet Right mid side sheet Ground bar to cable area Connector to circuit breaker cell Interunit ground bar Figure 29: Ground bus connections...

  • Page 68: Instrument Transformers

    GM-SG-AR medium-voltage switchgear | Instruction manual Instrument transformers Hazardous voltage. Will cause death, serious injury and property damage. Do not touch shutter or barrier if equipment is energized. De-energize and ground high-voltage conductors before working on or near them. Control power and voltage transformers...
  • Page 69 Instruction manual | GM-SG-AR medium-voltage switchgear Circuit breaker/auxiliary Auxiliary/auxiliary Figure 30a: Typical VT, CPT and CPT fuse rollout configuration Type GMSG circuit breaker Figure 30b: 27 kV and AUX with SIERS 2 -VT'S 3 -VT'S 1200A 33.63 1200A 33.63 1200A 33.63...
  • Page 70 GM-SG-AR medium-voltage switchgear | Instruction manual Hazardous voltage. Will cause death, serious injury and property damage. Do not place hands or objects into rollout trays until the rollout tray is fully withdrawn from the cell. When inserting or withdrawing a rollout tray, always complete the action in one continuous motion.
  • Page 71 Instruction manual | GM-SG-AR medium-voltage switchgear 6. Completely unscrew the rollout racking tool Shown with rollout racking tools installed. from the right-hand access opening and remove the tool. 7. Completely unscrew the rollout racking tool from the left-hand access opening and remove the tool.
  • Page 72 GM-SG-AR medium-voltage switchgear | Instruction manual 5. Repeat steps 3 and 4 for the right-hand racking 4. Verify that the rollout latch is disengaged by access opening. looking through the viewing window at the latch indicator on the lower right side of the 6.
  • Page 73 Instruction manual | GM-SG-AR medium-voltage switchgear 4. The half-cell rollout tray may now be removed position is indicated by a letter "C" in the from the extension rails by using the approved indicator window on the cell door. Siemens rollout tray lifting device (refer to 8.
  • Page 74 GM-SG-AR medium-voltage switchgear | Instruction manual Disconnecting a full-cell VT rollout tray Important: Failure to follow instructions may result To provide an additional degree of protection to in damage to equipment. Return racking personnel in the event of an internal arc fault,...
  • Page 75 Instruction manual | GM-SG-AR medium-voltage switchgear Disconnecting a full-cell CPT rollout tray or a 5. Rotate the racking crank counterclockwise until CPT fuse rollout tray the auxiliary rollout tray is in the DISCONNECT To provide an additional degree of protection to position.
  • Page 76 GM-SG-AR medium-voltage switchgear | Instruction manual Connecting a full-cell CPT rollout tray or a racking device accessory, refer to Annex A for CPT fuse rollout tray instructions for this device, which supplement To provide an additional degree of protection to the instructions in this section.
  • Page 77 Zero sequence CTs may require that conduits for multiple The full-cell auxiliary rollout trays for type GM-SG-AR bottom entrance cables be recessed (refer to Figure switchgear weigh up to 495 lbs (225 kg) depending 24: Primary cable termination and insulation on upon their configurations.
  • Page 78 GM-SG-AR medium-voltage switchgear | Instruction manual C. Step 3: Key interlock on rollout tray is extended, preventing operation of handle/interlock bars. Insert key, rotate A. Step 1: Secondary circuit breaker is key interlock, withdrawing interlock closed. Open secondary circuit bolt.
  • Page 79 Instruction manual | GM-SG-AR medium-voltage switchgear A. VT rollout tray in CONNECTED position. B. Handle/interlock bar retracted to allow rollout Handle/interlock bar fully extended to secure tray to be withdrawn. VT rollout tray in cell. C. Extension rail being inserted.

  • Page 80: Circuit Breaker Positions

    GM-SG-AR medium-voltage switchgear | Instruction manual Circuit breaker positions Circuit breaker cell preparation Interference blocking plate (rating interlock) The circuit breaker cell contains the positioning, interlocking and operating devices described below This plate is mounted vertically on the bottom of the...

  • Page 81: Shutter Operation

    Instruction manual | GM-SG-AR medium-voltage switchgear Secondary disconnect The secondary disconnect contains all the electrical control circuit connections for the circuit breaker. It mates with the secondary disconnect block on the circuit breaker. The circuit breaker contacts slide against the cell contact strips. The secondary contacts are automatically mated in the TEST and CONNECT positions.

  • Page 82: Installation And Removal

    GM-SG-AR medium-voltage switchgear | Instruction manual Figure 40: MOC and TOC switches (MOC/TOC switch cover removed for photo) Item Description Closed circuit breaker interlock Rating interlock Trip-free interlock Racking mechanism release handle Ground disconnect Circuit breaker frame Figure 39: Interlocks on bottom of circuit breaker...
  • Page 83 Instruction manual | GM-SG-AR medium-voltage switchgear De-energizing control power to circuit breaker Locate the control power disconnect device associated with the circuit breaker. This disconnect (typically, a pullout type fuse holder) is normally located on the secondary device panel inside the secondary compartment.
  • Page 84 GM-SG-AR medium-voltage switchgear | Instruction manual Heavy weight. Can result in death, serious injury or property damage. Always use extension rails to remove or install circuit breaker in cells not installed at floor level. Figure 43: Lift truck with circuit...
  • Page 85 Instruction manual | GM-SG-AR medium-voltage switchgear Heavy weight. Can result in death, serious injury or property damage. Do not transport a circuit breaker on a lift truck or other lifting device with the circuit breaker in the raised position. Item...
  • Page 86 GM-SG-AR medium-voltage switchgear | Instruction manual 5. Depress and hold down the circuit breaker racking latch release handle (refer to Figure 42: Front panel of type GMSG circuit breaker on page 75) and pull the circuit breaker out from the DISCONNECT position. The circuit breaker may now be removed from the cubicle and rolled out onto the two extension rails.
  • Page 87 Instruction manual | GM-SG-AR medium-voltage switchgear The SIERS system is available in three Note: If the socket is not aligned, the socket will not configurations: be able to engage. The socket (square) must be aligned with the square shoulder of the racking 1.
  • Page 88 GM-SG-AR medium-voltage switchgear | Instruction manual Racking from DISCONNECT to CONNECT position 1. Check that the racking position indicator shows "D" for DISCONNECT position. 2. Check that the circuit breaker or rollout tray is fully pushed into the cell to the DISCONNECT position.
  • Page 89 Instruction manual | GM-SG-AR medium-voltage switchgear Hazardous voltage. Will cause death or serious injury. De-energize and ground the equipment before checking contact penetration. Contact penetration Note: Racking handle must be removed allowing Make certain all electrical connections to both the the interlock slides to return to their initial position.
  • Page 90 GM-SG-AR medium-voltage switchgear | Instruction manual In order to lock the circuit breaker trip-free in either Without key interlocks the TEST or CONNECT positions, the circuit breaker must be opened and the trip-free interlock slide assembly pushed forward to lift the trip-free roller on the circuit breaker.
  • Page 91 Instruction manual | GM-SG-AR medium-voltage switchgear Spring discharge function the spring-dump/trip-free roller assembly of the The closing spring discharge function prevents the circuit breaker is driven upward activating the insertion or removal of a circuit breaker with a spring-dump linkage located inside the circuit charged mechanism.

  • Page 92: Inspection And Testing

    GM-SG-AR medium-voltage switchgear | Instruction manual Inspection and testing Inspection and testing 9. Relays coordinated with other relays and Before the equipment is energized, it must be protection devices on the system. Refer to relay thoroughly inspected and tested. Correct any instructions before making any adjustments.
  • Page 93 Instruction manual | GM-SG-AR medium-voltage switchgear 17. All pressure relief devices are free to operate In accordance with IEEE C37.20.2, Clause 6.5, field as designed. dielectric tests are also recommended when new units are added to an existing installation or after 18.
  • Page 94 GM-SG-AR medium-voltage switchgear | Instruction manual Placing equipment into service To place equipment in service for the first time proceed as follows: 1. Check that all circuit breakers are open and all control circuits energized. 2. Connect primary incoming power source to equipment.

  • Page 95: Maintenance

    Instruction manual | GM-SG-AR medium-voltage switchgear Maintenance Inspection and maintenance intervals For the safety of maintenance personnel as well as Periodic inspections and maintenance are essential others who might be exposed to hazards associated to obtain safe and reliable operation of the with maintenance activities, the safety related work switchgear.
  • Page 96 GM-SG-AR medium-voltage switchgear | Instruction manual Table 4: Maintenance tasks Maintenance tasks 1. Before any maintenance work is performed within primary compartments, make certain that the equipment is completely de-energized, tested, grounded, tagged or locked out and released for work in an authorized manner.
  • Page 97 Purchaser’s purposes, the matter should be possibility of communicating faults and prevent the referred to Siemens at +1 (800) 333-7421 or development of bus faults that would result if +1 (423) 262-5700 outside the U.S.

  • Page 98: Cleaning Insulation

    GM-SG-AR medium-voltage switchgear | Instruction manual Hazardous voltage. Will cause death, serious injury and property damage. Read instruction manuals, observe safety instructions and use qualified personnel. Lubrication Note: Use of lubricant not suitable for the It is essential that switchgear be lubricated carefully...
  • Page 99 Instruction manual | GM-SG-AR medium-voltage switchgear The use of unauthorized parts in the repair of the equipment or tampering by unqualified personnel will result in dangerous conditions that will cause death, serious injury or equipment damage. Follow all safety instructions contained herein.

  • Page 100: Disposal

    GM-SG-AR medium-voltage switchgear | Instruction manual Disposal Siemens equipment is environmentally friendly • Small electronics, insulated cables, and motors: product predominantly consisting of recyclable Should be recycled via electronics scrap materials. For disposal, some disassembly, disposal companies specialized in separating separation, and professional services handling may and sorting as described above.

  • Page 101: Accessories

    Instruction manual | GM-SG-AR medium-voltage switchgear Accessories Rollout racking tool for half-cell rollout trays When connected, the circuit The rollout racking tool (refer to Figure 50: Rollout breaker may be opened or closed racking tools and manual trip rod) is used to operate...
  • Page 102 GM-SG-AR medium-voltage switchgear | Instruction manual Handling of type GMSG circuit breakers and 6. Verify the position of the forks under the full-cell rollout trays with lift truck circuit breaker or rollout tray to ensure Depending on the rating, type GMSG circuit that it is properly supported as shown in breakers can weigh up to 930 lbs (421 kg).
  • Page 103 The rollout auxiliary with lift truck tray is fully engaged with the lift truck Depending on the rating, type GM-SG-AR half-cell when the capture bracket fits around rollout auxiliary trays can weigh up to 380 lbs (172 kg).
  • Page 104 The SIERS system allows an 5 kV 60 kV BIL operator to control the racking of a circuit breaker (or 63 kA rollout tray in arc-resistant GM-SG-AR 7 kV or 15 kV 95 kV BIL switchgear) from a remote location (outside the arc- Motors Locked rotor current <...

  • Page 105: Annex A - Electrical Racking Device

    Instruction manual | GM-SG-AR medium-voltage switchgear Annex A - Electrical racking device Hazardous voltage. Will cause death, serious injury and property damage. This equipment contains hazardous voltages and may be controlled remotely. Severe personal injury or property damage can result if safety instructions are not followed.
  • Page 106 GM-SG-AR medium-voltage switchgear | Instruction manual Instructions 1. Review the appropriate Switchgear Operating and Instruction Manual for proper operation and safety procedures and make certain that the equipment is released for maintenance in an authorized manner. 2. Following the procedures outlined in this instruction manual, close and latch the circuit breaker compartment front panel.
  • Page 107 Instruction manual | GM-SG-AR medium-voltage switchgear 7. Insert the locking pins into the ERD through the 13. When racking a device out (to the DISCONNECT holes in the brackets to secure the ERD to the position from the CONNECT position), once the brackets on the compartment front panel.

  • Page 108: Annex B - Optional Switch

    Annex B - Optional switch General The switch is operated by a spring-over-center, GM-SG-AR switchgear can be equipped with an stored-energy operating mechanism through a optional, fix-mounted, manually or electrically chain drive and is equipped with an arc chute and operated, single-throw, gang-operated, load- quick-make blade.

  • Page 109: Switch Operation

    Instruction manual | GM-SG-AR medium-voltage switchgear Item Description Arc chute Stationary arcing contact (not showing - inside item A arc chute) Insulator Stationary main contact Quick-acting blade Main switch blade Hinge contact Operating handle Position indicators Release knob Figure 60: Load-interrupter switch components...
  • Page 110 GM-SG-AR medium-voltage switchgear | Instruction manual Hazardous voltages. Will cause death, serious injury, or property damage. Never defeat the door interlock if the switch blades are in the CLOSED position (ON) unless all incoming power is disconnected, grounded, and locked out.
  • Page 111 Instruction manual | GM-SG-AR medium-voltage switchgear Hazardous voltages and high-speed moving parts. Will cause death, serious injury, or property damage. Do not work on energized equipment. Always de-energize and ground the equipment before working on the equipment. Load-interrupter switch maintenance...
  • Page 112 GM-SG-AR medium-voltage switchgear | Instruction manual Hazardous voltages and high-speed moving parts. Will cause death, serious injury, or property damage. Do not work on energized equipment. Always de-energize and ground the equipment before working on the equipment. Load-interrupter switch main blade alignment...
  • Page 113 Instruction manual | GM-SG-AR medium-voltage switchgear Hazardous voltages and high-speed moving parts. Will cause death, serious injury, or property damage. Do not work on energized equipment. Always de-energize and ground the equipment before working on the equipment. Load-interrupter switch quick-acting blade...
  • Page 114 GM-SG-AR medium-voltage switchgear | Instruction manual Hazardous voltages and high-speed moving parts. Will cause death, serious injury, or property damage. Do not work on energized equipment. Always de-energize and ground the equipment before working on the equipment. Load-interrupter switch hinge-contact...
  • Page 115 Instruction manual | GM-SG-AR medium-voltage switchgear Hazardous voltages and high-speed moving parts. Will cause death, serious injury, or property damage. Do not work on energized equipment. Always de-energize and ground the equipment before working on the equipment. Load-interrupter switch jaw-contact pressure adjustment Verify that the load-interrupter switch is closed.
  • Page 116 Telephone: +1 (800) 333-7421 to the accuracy or completeness of the content usa.siemens.com/mvswitchgear contained herein. Siemens reserves the right to Order No. SIEA-T40022-00-4AUS modify the technology and product specifications in its sole discretion without advance notice.

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