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Circuit Breaker Ground Connection

A sliding contact multiple finger assembly for grounding the
circuit breaker frame is mounted underneath the breaker truck
frame, as shown in

Figure 34

. This assembly engages the

ground bar mounted in the cell and maintains a solid ground
contact with a continuous wipe through all positions. The contact
is broken when the breaker passes the DISCONNECT position
while being removed from the cell.

Shutter Operation

Two shutter operating levers, one on each side of the breaker
cell, are driven down by the engagement of the wheels on the
circuit breaker frame. This opens the shutters as the circuit
breaker is moved into the CONNECT position and allows the
shutters to close when the circuit breaker is withdrawn. The
shutters are fully closed with the breaker in the TEST position.

Figure 35.

MOC and TOC Switches (cover removed for photo)

Breaker Installation and Removal

Type GMI Vacuum Circuit Breakers are normally shipped
installed in the switchgear cells. They are normally shipped with
their primary contacts open and the closing springs discharged.
However, before racking of a circuit breaker or performing any
inspection or maintenance, verify that the circuit breaker is
open with closing springs discharged. Refer to instruction
manual SG-3268 for information on installation, maintenance,
and handling of these circuit breakers.

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 circuit breaker cell. Removal of the fuse holder de-
energizes control power to the circuit breaker in the respective
switchgear cell. In some switchgear assemblies, a molded
case circuit breaker is used in lieu of the pullout type fuse
holder. Opening this circuit breaker accomplishes the same
result: control power is disconnected.

Spring Discharge Check

Perform the Spring Discharge Check

before

inserting or

removing the circuit breaker from the switchgear. Refer to

Figure 36.

The spring discharge check consists of simply performing the
following tasks in the order given. This check assures that
both the tripping and closing springs are fully discharged.

Figure 36.

Front Panel Controls of GMI Circuit Breaker

Circuit Breaker Position

38

1595-95

1574-95

TOC

Switch

Connections

TOC

Switch

Actuator

MOC

Switch

Actuator

MOC

Switch

Connections

Open-Closed
Indicator

Charged-
Discharged
Indicator

Manual
Close

Manual
Trip

Courtesy of NationalSwitchgear.com

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Содержание SGIM-3258C

Страница 1: ...5kV and 15kV Metal Clad Switchgear Type GM Instructions Installation Operation Maintenance SGIM 3258C Courtesy of NationalSwitchgear com ...

Страница 2: ...uctions do not purport to cover all details or variations in equipment nor to provide for every possible contingency to be met in connection with installation operation or maintenance Should further information be desired or should particular problems arise which are not covered sufficiently for the purchaser s purposes the matter should be referred to the local sales office The contents of this i...

Страница 3: ... 29 Secondary Control Wiring 31 Ground Connections 31 Temporary Ground Connections 31 Instrument Transformers 32 36 Control Power and Voltage Transformers General Information 32 Voltage Transformers 32 Control Power Transformer 33 Operating Sequence 33 To Disconnect VT Rollout 33 To Connect VT Rollout 33 To Disconnect CPT Rollout or CPT Fuses 33 To Connect CPT Rollout or CPT Fuses 33 Current Trans...

Страница 4: ...voided will result in death or serious injury Warning Indicates a potentially hazardous situation which if not avoided could result in death or serious injury Caution indicates a potentially hazardous situation which if not avoided may result in minor or moderate injury Dangerous Procedures In addition to other procedures described in this manual as dangerous user personnel must adhere to the foll...

Страница 5: ...lass of switchgear is ANSI C37 20 2 Metal Clad Switchgear The instructions included in this manual are provided to aid you in obtaining longer and more economical service from your Siemens switchgear For proper installation and operation this information should be distributed to your operators and engineers By carefully following these instructions difficulties should be avoided However they are n...

Страница 6: ...nd primary circuits are isolated from each other by shutters or barriers Primary bus and joints are completely encased with insulation materials to suit the voltage class of the equipment Siemens switchgear carries a type designation or class as shown in Table 1 These designations may appear on draw ings and familiarity with them will simplify communications with the factory Indoor equipment is ar...

Страница 7: ...damage must be noted on the delivery receipt and acknowledged with the driver s signature The damage should be detailed as much as possible It is essential that a notation Possible internal damage subject to inspection be included on delivery receipt If the driver will not sign the delivery receipt with damage noted the shipment should not be signed for by the consignee or his agent 4 Notify the S...

Страница 8: ...e con nected to the eyes in the top lifting bars One set of lifting bars is located near the front of the switchgear while another set of lift bars is located closer to the middle of the switchgear as illustrated in Figure 2 A crane with sufficient height should be used so the load angle from horizontal on the lifting cables will be at least 45 degrees when viewed from the front or the rear A less...

Страница 9: ...7mm longer than the depth of the switchgear and should include adequate means to prevent the lifting cables from slipping off of the lifting pipe during use Figure 6 shows a method of using jacks on outdoor switchgear to facilitate the use of rollers under the shipping skid Care must be used with this method to prevent damage to the doors and to maintain stability of the timbers Refer to previous ...

Страница 10: ...orage is for an extensive period of time When batteries are supplied connect them to a charger Storage Shelter Clad Outdoor Switchgear When it is necessary to store Shelter Clad outdoor equipment in a location exposing it to the weather or in a humid location energize the space heaters provided within the sections and make certain that louvers and vents are uncovered to allow air to circulate If a...

Страница 11: ... above this plane within the area covered by the switchgear If the floor or sills do not meet this requirement it will be necessary to use shims when installing the switchgear on the mounting surface Figure 7 illustrates the location for sill channels for anchoring indoor switchgear Cubicles may be anchored to sills by use of 1 2 or 12mm diameter anchor bolts or welded in position Outdoor Foundati...

Страница 12: ...0 ALLOW 6 0 FOR BREAKER WITHDRAWAL 3 75 0 3 25 51 0 92 62 94 0 MAXIMUM AVAILABLE SPACE FOR CUSTOMER PRIMARY CONNECTION FROM LOWER BREAKER THRU BOTTOM OR FROM LOWER BREAKER THRU TOP OR CUSTOMER PRIMARY CONNECTION MAXIMUM AVAILABLE SPACE FOR SECONDARY LEADS BELOW OR ABOVE PREFERRED LOCATION FOR CUSTOMER LEFT HAND SIDE OPTIONAL WITHDRAWAL FOR BREAKER RECOMMENDED ALLOW 76 FLOOR PLAN 50 DIA ANCHOR BOLT...

Страница 13: ...CE FOR CUSTOMER PRIMARY CONNECTION FROM LOWER BREAKER THRU BOTTOM OR FROM LOWER BREAKER THRU TOP OR CUSTOMER PRIMARY CONNECTION MAXIMUM AVAILABLE SPACE FOR SECONDARY LEADS BELOW OR ABOVE PREFERRED LOCATION FOR CUSTOMER LEFT HAND SIDE OPTIONAL FLOOR LINE DRAWOUT SIDE AISLE WALL FLOOR LINE AISLE FLOOR FLOOR LINE FRONT BREAKER LOCATION OF 75 DIA ANCHOR BOLTS BOLTS NUTS FURNISHED BY CUSTOMER CLAMP WAS...

Страница 14: ...TEND MORE THAN CUSTOMER CONDUIT IS NOT 7 0 ABOVE FLOOR LINE TO EXTEND MORE THAN CUSTOMER CONDUIT IS NOT LOCATION OF 75 DIA FURNISHED BY CUSTOMER ANCHOR BOLTS BOLTS NUTS CLAMP WASHERS FURNISHED BY SIEMENS ANCHOR BOLTING ARRANGEMENT TYPE SCGM SWITCHGEAR FLOOR LINE BREAKER DRAWOUT SIDE FLOOR LINE SIDE DRAWOUT BREAKER 18 0 ANCHOR BOLT LOCATIONS 18 0 AREA A AREA B SEE FIGURE 7 FOR EXPLANATION OF CABLE ...

Страница 15: ... LINE DRAWOUT BREAKER OF FRAME FRONT CUSTOMER CONDUIT IS NOT TO EXTEND MORE THAN 7 0 ABOVE FLOOR LINE LOCATION OF 75 DIA ANCHOR BOLTS BOLTS NUTS FURNISHED BY CUSTOMER CLAMP WASHERS FURNISHED BY SIEMENS ANCHOR BOLTING ARRANGEMENT TYPE OGM SWITCHGEAR AREA A AREA B SEE FIGURE 7 FOR EXPLANATION OF CABLE AREAS 36 0 36 0 94 0 7 38 2 38 31 0 12 12 2 38 3 75 7 0 ALLOW 30 0 CLEARANCE FOR DOOR SWING ON LEFT...

Страница 16: ... very desirable that the switchgear be placed in position first and then position the transformer If the transformer must be positioned first conduit couplings should be provided in the switchgear foundation so that the conduits do not extend more than approximately 2 51mm above the switchgear mounting surface The switchgear should be positioned near the transformer and just high enough to clear t...

Страница 17: ... installation if arrangement consists of more than one shipping group Single aisle Shelter Clad cubicles are shipped with the aisle wall covering the breaker drawout compartment This wall may be removed before moving the switchgear into position on its foundation if conduit clearances are in doubt of if the aisle is to be assembled immediately after leveling 1 Remove seal material at top of aisle ...

Страница 18: ...lates of cubicles 4 Mount aisle conduit switches receptacle and wire to the junction boxes See conduit arrangement 5 Place roof decks in position and fasten with bolts provided 6 Fasten the roof decks together with 3 8 hardware 7 Set channel shaped covers over the joints of roof decks and bolt to clips welded to roof with retainer nuts 8 Tighten all bolts to complete assembly 9 Drill cable cover t...

Страница 19: ...leveled bolt units together with 1 2 hardware provided 8 Run aisle wiring from the terminal block in existing end units through the barrier and header to the junction box area 9 Mount other parts removed from existing equipment and caulk all external seams with metal filler 10 Make all electrical connections as instructed in installation manual or shown on drawings 11 Caulk each vertical split at ...

Страница 20: ...means will distort cubicles 3 Add clamp washers and nuts to anchor bolts and tighten securely 4 Check all breaker compartments for free movement of the shutters 5 Move the next group into position The front edge of the cubicle base should be in line with those of the previous ly installed group This will insure a good fit with the aisle floor plates Make certain that the end of the group being ins...

Страница 21: ...Aisle floor assembly 18 748 411 501 57 Aisle wall spacer 18 658 130 048 58 Aisle roof 18 808 034 501 60 Aisle roof spacer 18 658 106 037 61 Housing assembly 6 18 483 740 501 63 Aisle roof trim angle 18 740 698 124 See Note 1 NOTES 1 Apply Caulking 15 172 454 001 A A C C FRONT SEE NOTE 1 58 133 134 135 136 137 57 57 129 130 131 132 125 126 128 138 66 61 58 106 107 109 108 104 102 101 103 Installati...

Страница 22: ... trim angle 18 740 698 124 25 50 50 2 25 37 2 12 1 25 3 0 3 37 3 37 3 0 1 25 50 25 2 25 37 50 76 0 82 0 A A SEE NOTE 1 SEE NOTE 1 SECTION A A LEFT END RIGHT END AISLE FLOOR PLATE CHANNEL SWITCHGEAR 2 12 INSTALL PEM STUDS FROM THIS SIDE SEE NOTE 1 NOTES 1 Apply Caulking 15 172 454 001 2 See Figure 15 for Sections and from top to bottom SECTION C C 62 106 107 109 108 102 104 101 103 66 64 74 58 66 1...

Страница 23: ...E NOTE 1 L H SIDE INSTALL PEM STUD FROM THIS SIDE VIEW A SEE NOTE 2 MTG HOLES FOR COVER PLATE Installation Details 128 138 126 125 66 61 130 129 131 132 74 58 64 65 125 127 57 55 157 156 155 158 56 54 101 155 102 156 104 103 157 78 58 57 54 33 31 136 134 135 137 133 179 178 177 176 158 157 156 155 178 179 176 177 72 106 107 109 108 104 103 102 101 61 110 111 112 113 61 57 55 78 102 103 104 75 105 ...

Страница 24: ...3 001 73 Workspace floor assembly 18 748 418 501 74 Roof panel 18 814 101 501 75 End trim front left end 18 815 700 002 76 End trim front right end 18 815 700 001 77 End trim rear left right 18 815 701 001 78 Roof support front 18 814 126 001 101 113 Aisle end hardware 18 658 583 823 125 138 Aisle roof floor hardware 18 658 583 824 Item No Part Name Part Number 54 Aisle floor assembly 18 748 412 5...

Страница 25: ...d the boot In some cases a snap closure is molded into the boot and replaces some of the plastic hardware 2 All surfaces must be free of dust dirt or other foreign material Do not use any abrasive cleaner on plated contact surfaces Cleaning is normally not necessary and should not be done unless parts are badly tarnished If cleaning is nec essary use a mild cleaner and thoroughly rinse the parts t...

Страница 26: ...ll insulation boots or tape joints where required per instructions in following sections 10 Connect ground bus See Figure 28 Insert bar in side wall opening to overlap the ground bus in adjacent cubicles 11 Torque the 0 38 SAE Grade 5 cap screw used in the ground bus to 25 40 lb ft 34 to 54 Nm Electrical Connections 24 Figure 16 Main Bus Joints Breaker Section Insulation Boot Bus Riser REAR VIEW M...

Страница 27: ... or MAIN BUS TYP ONE 3 8 X 6 COPPER or ONE 3 8 X 6 ALUMINUM TWO 3 8 X 6 ALUMINUM THREE 3 8 X 6 ALUMINUM BREAKER IN UPPER CELL C B A SIDE VIEW MAIN BUS BAR REAR VIEW INSULATION BOOT For Illustration Only Shown with 3 Bars in Phase A and 2 Bar in Phase B and 1 Bar in Phase C B A C Molded Glass Polyester Support Illustration depicts arrangement with standard molded glass polyester bus support Electri...

Страница 28: ...CK Epoxy insulation applied in a fluidized bed process is normally furnished on the bus bars Bus joints are normally insulated with boots Taping is also used for bus joint insulation The ANSI requirements for bus insulation in metal clad switchgear are contained in ANSI C37 20 2 clause 6 2 3 which reads as follows This insulating covering is a requirement of metal clad switchgear and is provided t...

Страница 29: ... snap type clo sure Carefully remove the insulation boot and save all hardware After the bus bar joint has been properly assembled reinstall the insulation boot Secure the boot closed with the nylon nuts and bolts Completed boot installation should be flush with the bus bar insulation and overlap it by at least 1 1 2 38mm In those cases where the boot does not close flush with the bus bar insulati...

Страница 30: ... have been removed and bus bars have been installed Connection bolts have been correctly torqued Unit is ready for reinstalla tion of insulation boots C Insulation boots have been reinstalled Unit is ready for reinstallation of main bus compartment barrier designated R in Figure 25 D Taped bus joint configuration used for joints where a boot is not available This illustrates a taped connection for...

Страница 31: ...here the spacing between conductors is usually large enough so that the conductors need not be insulated The use of flexible connectors in this area insures correct alignment of the switchgear conductors to the transformer conductors If the installed clearance phase to phase or phase to ground is less than 6 152mm for 8 25kV and 15kV switchgear 3 5 89mm for 5kV switchgear the joint must be insulat...

Страница 32: ... EXIT B TWO FEEDER CIRCUIT BREAKERS C TWO BREAKERS UPPER CABLES TOP EXIT LOWER CABLES BOTTOM EXIT D BREAKER ABOVE AUXILIARY CABLES TOP EXIT E AUXILIARY OVER BREAKER CABLES BOTTOM EXIT BREAKER GMI BREAKER GMI BREAKER GMI BREAKER GMI GS GS GS GS GS GS GS GS R F Electrical Connections 30 Courtesy of NationalSwitchgear com ...

Страница 33: ...nstallation All purchaser wiring is to be routed behind the cable retainer which is removable for installation purposes Use plastic or nylon ties to secure all field installed wires to the cubicle structure Figure 27 Secondary Control Cable Connections Ground Connections A common ground bus is incorporated in all units for properly grounding the equipment after installation The ground bus extendin...

Страница 34: ...ersonnel can contact the insulating shutter with complete safety Voltage Transformers One two or three voltage transformers with primary fuses may be mounted on the rollout tray located in positions C D E and or F See the Operating Sequence section for discon necting connecting or withdrawal instructions Typical rollout tray and transformer locations are shown in the side views in Figure 29 Table ...

Страница 35: ...ray in firmly to the fully connected position Then push the extension rails in to their fully inserted position When this is done holes in the extension rails should align with holes in the cell structure which will allow the handle interlock bar to be released locking the rollout tray into the connected position in the unit To Disconnect CPT Rollout or CPT Fuses Refer to Figure 31 Withdrawal of a...

Страница 36: ...Handle interlock Bars Fully Extended to Secure Rollout Tray in Cell B Handle interlock Bars Retracted to Allow Rollout Tray to be Withdrawn C Extension Rails Withdrawn to Fully Extended Position D VT Rollout Tray Withdrawn to Allow Inspection of Fuses 1627 95 1628 95 1625 95 1624 95 Courtesy of NationalSwitchgear com ...

Страница 37: ...k to block closing of secondary breaker Remove key 05093 89 C Step 3 Key interlock on rollout tray is extended prevent ing operation of handle interlock bars Insert key rotate key interlock withdrawing interlock so that handle interlock bar is free to move 05091 89 D Step 4 Key interlock withdrawn Operate handle inter lock bar to allow withdrawal of rollout tray 05090 89 05102 89 A B C D Courtesy ...

Страница 38: ...r Up to two standard or one high accuracy current trans formers may be mounted around each primary insulator tube Figure 32 Type MD CT s Installed on Upper and Lower Disconnects CT Barrier Removed for Photo A zero sequence torroidal current transformer can be furnished for ground sensing circuits This transformer is mounted in the primary cable area at a convenient height for receiving pur chaser ...

Страница 39: ...y 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 Mechanism Operated Cell Switch MOC This switch is operated by a roller on the circuit breaker The breaker engages the MOC auxiliary switch only in the CONNECT operating position unless an optional TEST position...

Страница 40: ...fy that the circuit breaker is open with closing springs discharged Refer to instruction manual SG 3268 for information on installation maintenance and handling of these circuit breakers 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 seconda...

Страница 41: ... front of the breaker cell and push in see Racking Crank Engagement Procedure This action operates the racking interlock latch Figure 37 shows racking of a circuit breaker 2 Rotate the racking crank counterclockwise until the break er is in the DISCONNECT position 3 Release the breaker release latch and pull the circuit breaker out from the DISCONNECT position The breaker can now be removed from c...

Страница 42: ...vel is 1 Insert the two extension rails into the fixed rails Be sure the extension rails are properly secured in place This can be done at Step 4 if preferred 2 Insert the racking crank on the racking screw on the front of the breaker cell and push in see Racking Crank Engagement Procedure This action operates the racking interlock latch 3 Rotate the racking crank counterclockwise until the breake...

Страница 43: ... square socket end of the crank will only engage the square portion of the shaft if it is aligned properly The suggested procedure to engage the racking mechanism is as follows 1 The breaker must be open The racking shroud cannot be moved if the breaker is closed 2 Hold the socket end of the crank in one hand and the crank handle in the other hand Refer to Figure 42 3 Place the socket over the end...

Страница 44: ...sed 8 Rotate the racking crank clockwise about 54 turns until a positive stop is felt and the position indicated shows C for the CONNECT position The indicator will show T when the circuit breaker is in TEST position Racking from CONNECT to TEST or DISCONNECT Position 1 This procedure is essentially the same as racking to con nected position procedure except the rotation is counter clockwise 2 Che...

Страница 45: ...rcuit breaker in a mechanically trip free condition In order to lock the circuit breaker trip free in either the TEST or CONNECT positions the breaker must be opened and the trip free interlock slide assembly pushed forward to lift the trip free roller on the breaker This position permits the use of a key interlock Figure 45 item 41 or padlocks up to 3 to maintain the mechanism in trip free positi...

Страница 46: ...eptable alternative to AC withstand tests When making DC tests the voltage should be raised to the test value in discrete steps and held for a period of one minute In accordance with ANSI C37 20 2 Clause 5 5 Field Dielectric Tests are also recommended when new units are added to an existing installation or after major field modifications The equipment should be put in good con dition prior to the ...

Страница 47: ...ng or major repair but should be designed to reveal if possible the need for such actions in time to prevent malfunctions during operation Switchgear assemblies are enclosed on all sides and top with sheet metal Access into the enclosure is provided by doors or removable covers Although the bus and connections are insulated in metal clad switchgear assemblies it is a coordinated insulation system ...

Страница 48: ...ting work on the switchgear the following should be completed on any equipment that will affect the area of the work A Disable remote control and automatic transfer schemes B De energize all direct and back feed power and control sources test and ground C Disconnect all voltage and control power trans formers D Open all disconnects 3 Include the following items in your inspection procedure A Check...

Страница 49: ...art No 15 171 370 002 available in 8 oz 23kg tubes Other exposed components can be protected with a coat of glyptol or other corrosion resistant coating When old grease becomes dirty wipe the part clean and apply new grease immediately Relays and Instruments To insure satisfactory operation of relays and instruments do not leave device covers off longer than necessary When a cover has been broken ...

Страница 50: ...ected to a suitable power supply by purchaser Lift Truck When specified a lift truck is supplied see Figure 41 for handling circuit breakers The lift truck is useful whenever circuit breakers are installed above floor level For Shelter Clad installations the lift truck is normally stored in the aisle area as it does not conveniently pass through the aisle doorway Lift Sling If a lift truck is not ...

Страница 51: ...est voltages to switchgear may damage the surge limiters Table 7 Type 3EF Surge Limiter Application Recommendations 1 Surge limiter not necessary if surge capacitors or surge arrestors are located at transformer terminals 2 Surge limiter not necessary if surge capacitors or surge arrestors are located at machine terminals Table 8 Type 3EF Surge Limiter Data Rated Voltage kV 3 6 6 7 5 11 15 MCOV of...

Страница 52: ...tributionLLC P O Box 29503 Raleigh NC 27626 0503 SGIM3258C Replaces SG 3258B 3M398TD Printed in U S A 1998 Siemens Power Transmission DistributionLLC SIEMENS is a registered trademark of Siemens AG Courtesy of NationalSwitchgear com ...

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