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9

Installation Checks and Initial Functional Tests

Introduction

The Type GMI vacuum circuit breaker is of drawout
construction designed for use in medium voltage, metal-
clad switchgear. The GMI circuit breaker conforms to the
requirements of ANSI standards C37.20.2, C37.04, C37.06,
C37.09 and C37.010.

GMI circuit breakers consist of three vacuum interrupters, a
stored energy operating mechanism, necessary electrical
controls and interlock devices, disconnect devices to
connect the circuit breaker to both primary and control
power and an operator housing. On some circuit breaker
ratings, insulating barriers are located between the
vacuum interrupters or along the sides.

This section describes the operation of each major
subassembly as an aid in the operation, installation, main-
tenance and repair of the GMI vacuum circuit breaker.

Vacuum Interrupters and Primary Disconnects

The operating principle of the GMI vacuum interrupter is
simple.

Figure 11

is a cutaway view of a typical vacuum

interrupter. The entire assembly is sealed after a vacuum is
established. The interrupter stationary contact is
connected to the upper disconnect stud of the circuit
breaker. The interrupter movable contact is connected to
the lower disconnect stud and driving mechanism of the
circuit breaker. The metal bellows assembly provides a
secure seal around the movable contact, preventing loss of
vacuum while permitting vertical motion of the movable
contact.

When the two contacts separate an arc is initiated which
continues conduction up to the following current zero. At
current zero, the arc extinguishes and any conductive
metal vapor which has been created by and supported the
arc condenses on the contacts and on the surrounding
vapor shield. Contact materials and configuration are opti-
mized to achieve arc control and to minimize switching
disturbances.

Figure 10:

Front View of GMI Circuit Breaker.

Figure 11:

Cutaway View of Typical Vacuum Interrupters.

Courtesy of NationalSwitchgear.com

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Содержание SGIM-3268H

Страница 1: ...Vacuum Circuit Breakers 5kV and 15kV Type GMI Instruction Installation Operation Maintenance SGIM 3268H Power Transmission and Distribution Inc Courtesy of NationalSwitchgear com ...

Страница 2: ... one who is familiar with the installation construction or operation of the equipment and the hazards involved In addition this person has the following qualifications a is trained and authorized to de energize clear ground and tag circuits and equipment in accordance with established safety practices b is trained in the proper care and use of protective equipment such as rubber gloves hard hat sa...

Страница 3: ...e Interlock 22 Rating Interlock 22 Circuit Breaker Frame 22 Ground Disconnect 23 Circuit Breaker Handling Wheels 23 Racking Mechanism 23 Maintenance 24 30 Introduction and Maintenance Intervals 24 Recommended Hand Tools 24 Recommended Maintenance and Lubrication 25 Removal from Switchgear 25 Checks of the Primary Power Path 26 Cleanliness Check 26 Inspection of Primary Disconnects 26 Checks of the...

Страница 4: ...which if not avoided 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 adhe...

Страница 5: ...ithin 15 days to assure prompt resolution of claims 3 Each circuit breaker should be appropriately lifted to avoid crushing the side panels of the circuit breaker or damaging the primary disconnect subassemblies Type GMI circuit breakers weigh between 385 to 575 pounds 175 to 261 kg See Table A 4 Technical Data in Appendix 4 The palleted circuit breaker can also be moved using a properly rated for...

Страница 6: ...t breaker and below the upper circuit breaker Figure 1 shows a pullout type fuse holder 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 Sprin...

Страница 7: ...step 2 Rotate the racking crank counter clockwise until the circuit breaker is in the Disconnect position The circuit breaker can now be removed from the cubicle 6 The circuit breaker is now free to be rolled out on the floor using the handles as shown in Figure 4 The wheels of the circuit breaker are virtually at floor level unless the switchgear is installed on a raised pad and one person should...

Страница 8: ... is in the Disconnect position 7 If you have not yet installed the extension rails do so now Note that some difficulty may be experienced installing the extension rails if the circuit breaker is in the Disconnect position If difficulty is encountered rack the circuit breaker to the Test position install the extension rails and then rack the circuit breaker to the Disconnect position 8 Move the cir...

Страница 9: ...til the spring condition indicator shows the closing spring is Charged 2 Repeat the Spring Discharge Check 3 Verify that the springs are discharged and the circuit breaker primary contacts are open by indicator positions As Found and Vacuum Integrity Check Tests Perform and record the results of both the As Found insula tion test and the vacuum integrity check high potential test Procedures for th...

Страница 10: ...rving the Open Closed indicator on the circuit breaker 6 De energize control power by repeating Step 1 Disconnect the plug jumper from the switchgear first and next from the circuit breaker 7 Perform the Spring Discharge Check again Verify that the closing springs are discharged and the primary contacts of the GMI circuit breaker are open Final Mechanical Inspections without Control Power 1 Make a...

Страница 11: ...g principle of the GMI vacuum interrupter is simple Figure 11 is a cutaway view of a typical vacuum interrupter The entire assembly is sealed after a vacuum is established The interrupter stationary contact is connected to the upper disconnect stud of the circuit breaker The interrupter movable contact is connected to the lower disconnect stud and driving mechanism of the circuit breaker The metal...

Страница 12: ...igu rations The insulated chair molded barrier is fixed mounting Individual barrier configuration includes two outer phase to ground insulating barriers and two interphase barriers The interphase barriers are not provided on all circuit breaker ratings The sheets of glass polyester insulating material and the insulated molded chair are attached to the circuit breaker and provide electrical insulat...

Страница 13: ...rresponding to the circuit breaker open with the closing springs discharged Figure 14a and charged Figure 15a Figure 16a shows portions of the operator mechanism that manually or elec trically charge the closing springs The drive cam 20 the closing spring crank arms Figure 19 and spring condition indicator cam 18 are directly keyed to the main cam shaft 3 The main cam shaft rotates counterclockwis...

Страница 14: ...tchet 22 will be released by this rotation allowing the main cam shaft 3 to be driven by the closing springs Depressing the manual close button on the operator panel causes the rotation of the close shaft 72 by the lower end of the close shaft actuator 75 Rotation of the main cam shaft 3 in a manual closing operation is identical to that of an electrical closing operation As the main cam shaft 3 r...

Страница 15: ... of Operation Up to Mid 1991 Pages 13 15 describe the operation of the mechanism used from 1989 until approximately mid 1991 This mechanism can be identified by observing the close latch above the spring charging motor on the left side of the circuit breaker Refer to Figure 18 The close hatchet 22 has a latch face which bears directly on the close shaft 72 If the close hatchet includes a bearing w...

Страница 16: ... Depressing the manual close button on the operator panel causes the rotation of the close shaft 72 by the lower end of the close shaft actuator 75 Rotation of the main cam shaft 3 in a manual closing operation is identical to that of an electrical closing operation As the main cam shaft 3 rotates the cam follower 115 is driven by drive cam 20 and the main link 120 is forced outwards and rotation ...

Страница 17: ...e counterclockwise Pressing the trip button causes the trip actuator lower arm to move again producing rotation of the trip shaft All of the linkages are trip free and tripping or opening is unaf fected by charging status of the closing springs or position of the drive cam 20 Rapid Auto Reclosing Mode Optional The closing springs are automatically recharged by the motor driven operating mechanism ...

Страница 18: ...or shock absorber Figures 19 and 19a The purpose of this damper is to limit overtravel and rebound of the vacuum interrupters movable contacts during the conclusion of an opening operation The damper action affects only the end of an opening operation Two types of dampers are used on GMI circuit breakers depending on the vacuum interrupter family used The respective damper systems are as described...

Страница 19: ...of the damper has outer threads for mating with a threaded adapter which is mounted in the upper portion of the circuit breaker frame The body of the damper is inserted into a cylinder which extends from the damper down to the connection on the circuit breaker jack shaft in the lower portion of the operating mechanism The damper s piston head is installed inside the outer cylinder which serves to ...

Страница 20: ...24 shows the circuit breaker mounted auxiliary switch This switch provides auxiliary contacts for control of circuit breaker closing and tripping functions Contacts are available for use in relaying and external logic circuits This switch is driven by linkages connected to the jack shaft The auxiliary switch contains both b Normally Closed and a Normally Open contacts When the circuit breaker is o...

Страница 21: ...itch LS1 is used to sense the position of the driven mechanisms This switch de energizes the charging motor when the Charged position of the closing springs is reached When the closing springs are discharged this switch energizes the control circuit powering the spring charging motor Spring charged switch LS2 operates simultaneously with motor switch LS1 The spring charged switch allows the close ...

Страница 22: ...g due to relay operation Refer to Figure 28c An electrolytic capacitor resides across the tripping supply voltage connected through a half wave rectifier and resistor The rectifier allows the capacitor to assume a charge approximating the peak voltage of the AC tripping supply voltage The series resistor limits the magnitude of charge current flowing into the capacitor The charged capacitor is the...

Страница 23: ...ng springs are partially recharged Prior to full spring charge LS3 NO closes and LS3 NC opens Symbols LS1 Motor Cutoff Switch LS2 Spring Charged Switch LS3 Checks Trip Latch Reset and Blocks Electric Close while Racking Test to Connect 52 a Aux Switch Open when Brk is Open 52 b Aux Switch Closed when Brk is Open 52Y Anti Pump Relay 52T Opening Solenoid Trip 52SRC Spring Release Solenoid Close 88 S...

Страница 24: ...nterlock and the trip free interlock Figure 29 Undervoltage Trip Option Trip Free Interlock Figure 30 shows the devices providing the trip free inter lock function The purpose of the trip free interlock is to hold the circuit circuit breaker operating mechanism mechanically and electrically trip free whenever the circuit breaker is between the Test and Connected positions within the switchgear enc...

Страница 25: ...uires the use of a hoist or crane These lifting devices are also required for removal of the lower circuit breaker of non walk in type outdoor switchgear Racking Mechanism Figure 31 shows the racking mechanism in the switchgear used to move the circuit breaker between the Disconnect Test and Connected positions This mechanism contains a set of interface blocks that mate with the bottom of the circ...

Страница 26: ...r must establish a periodic maintenance program to ensure trouble free and safe operation The frequency of inspection periodic cleaning and preventive mainte 24 Maintenance nance schedule will depend upon the operation conditions NFPA Publication 70B Electrical Equipment Maintenance may be used as a guide to establish such a program A preventive maintenance program is not intended to cover recondi...

Страница 27: ... to the test position Review instructions for removal of a circuit breaker from the upper or lower cell as appropriate for information on racking 3 With the circuit breaker in the Test position and OPEN de energize control power to the circuit breaker Review Figure 1 4 Perform the Spring Discharge Check by first pushing the red Trip pushbutton then the black Close pushbutton and finally the red Tr...

Страница 28: ...ts are checked for cleanliness and condition The vacuum interrupters are also checked for vacuum integrity Some test engineers prefer to perform the contact erosion check during the manual spring charging check of the operator since charging of the springs is necessary to place the contacts in the closed position Also the vacuum integrity check is usually performed in conjunction with the High Pot...

Страница 29: ...ontact condition is checked by the visibility of the white erosion mark shown in Figure 36 The white erosion mark is located in the keyway or slot on the movable stem of the vacuum interrupter near the plastic guide bushing The contact erosion check procedure is Be sure the breaker primary contacts are Closed Observe the white erosion mark Figure 36 of each pole When this mark is visible contact w...

Страница 30: ...should be well greased The full inner periphery of the cylinder and outer surface of the damper should be coated with Beacon 325 Electrical Control Checks The electrical controls of the GMI circuit breaker should be checked during inspections to verify absence of any mechanical damage and proper operation of the automatic spring charging and Close and Trip circuits Unless otherwise noted all of th...

Страница 31: ...nected to the switchgear by the plug jumper This check is made with the breaker energized by control power from the switchgear 1 Once the circuit breaker springs are charged move the switchgear Close Trip switch to the Close position There should be both the sound of the circuit breaker closing and indication that the circuit breaker contacts are closed by the main contact status indicator 2 As so...

Страница 32: ...tester and ground the circuit breaker housing Starting with zero volts gradu ally increase the test voltage to 1500 volts RMS 60 Hz Maintain test voltage for one minute 8 If no disruptive discharge occurs the secondary control insulation level is satisfactory 9 Disconnect the shorting wire and re attach the leads to the spring charging motor 10 Perform contact resistance tests of the primary conta...

Страница 33: ...the GMI circuit breaker once tension has been relieved retaining ring pliers are needed to remove the top and bottom retaining rings attaching each spring to its cross arm support shaft and its crank arm For later models of the GMI circuit breaker the lower spring hangers are fastened to the crank arms using hex socket shoulder bolt and nut The nut is applied using thread locking adhesive Loctite ...

Страница 34: ... holes With the tabs disengaged and grasping the top of the spring the whole assembly can be pulled forward When re assembling apply upward pressure to the shelf over stationary support and to engage the shelf tab guides The shelf may then be guided into place Verify that the dimension between both spring caps corresponds to the factory adjustment Replacement of Closing and Tripping Solenoids Devi...

Страница 35: ...d nut configuration in reassembly as was present in the as shipped condition Replacement of Trip Latch Reset Check Switch Device LS3 Note Two different latch systems have been used in GMI circuit breakers with changeover from one design to the other occurring in mid 1991 This instruction manual de scribes both designs Pages 11 13 describe the operation of the mechanism used beginning in approximat...

Страница 36: ...includes a bearing which contacts a hardened latch installed on the close shaft refer to the preceding section for replacement of the trip latch reset switch for your mechanism The trip latch reset check switch is mounted to the left when facing the front of the breaker vertical mechanism side sheet as shown in Figure 43b The switch is held in place by two screws When replacement of the trip latch...

Страница 37: ... requires a 11 4 inch open end wrench The damper should be adjusted so that the head of the piston just touches the striker pin inside the outer cylinder when the circuit breaker is in the open position A hole in the outer cylinder is provided so that the clearance between the striker pin and the head of the piston can be observed Check all associated parts damper body and telescoping cylinder for...

Страница 38: ... and 2000 A 48 VS 17006 1200 and 2000 A 48 VS 10028 1200 A 47 VS 10028 2000 and 3000 A 49 VS 15050 1200 A 53 VS 15050 2000 and 3000 A 54 VS 15050 3000 A 55 Circuit Breaker Side Elevation typical 46 Interrupter Clamp Fastening Procedure 51 Gaging Procedure Stroke Adjustments 52 R Re ef fe er re en nc ce e T Ta ab bl le es s a an nd d L Li is st ts s Recommended Tools Table 6 Fastener Torque Limits ...

Страница 39: ...e interrupter stationary contact to the primary extensions Using a 5 16 hex key hex key socket preferred remove two 3 8 socket head screws which secure the primary extension to the primary stab support Using a 9 16 socket and extension remove four 3 8 hex bolts fastening the upper primary stab support to the red post insulator Lift and remove set aside with care This item is bulky and awkward and ...

Страница 40: ...age the M12 bolt Figure 48 14 2 VS10006 and VS10028 Interrupters in Circuit Breakers rated 1200A Figure 47 With the interrupter in alignment under stab support place the primary extension into the gap between stab support and interrupter stationary contact Make sure contact surfaces are wiped clean Replace finger tight two 3 8 fasteners joining the primary extension to the stab support Insert an M...

Страница 41: ...he gage block until the gage foot just bears or comes within one washer thickness of bearing upon the lower surface of the bell crank shaft washer may have to be removed or added to achieve these conditions The spacer and washer above the gage block must be packed against the vacuum interrupter movable stem when observa tion of the gage foot to bell crank clearance is made The gage foot must just ...

Страница 42: ...ing procedure shown in Figure 51 and torque limits established in Table 7 secure interrupter clamp hardware 17 3 For 2000A ratings using VS15050 interrupter and all 3000A ratings not using the chair support design After the hardware for the flexible shunt interrupter clamp have been secured in section 17 2 the heat sinks that were removed in section 5 must be replaced The heat sinks must be instal...

Страница 43: ...0 65 ft lbs M12 x 1 75 30 35 ft lbs 1 3 8 16 2 3 8 16 26 36 ft lbs VS10028 M16 x 2 60 65 ft lbs M12 x 1 75 30 35 ft lbs 1 3 8 16 2 3 8 16 26 36 ft lbs VS15050 M16 x 2 60 65 ft lbs M12 x 1 75 30 35 ft lbs 1 3 8 16 2 3 8 16 26 36 ft lbs O Op pe en n E En nd d o or r B Bo ox x E En nd d W Wr re en nc ch he es s 7 16 1 2 9 16 5 8 11 16 S So oc ck ke et t W Wr re en nc ch he es s 1 2 drive preferred 7 ...

Страница 44: ...000 and 3000A Figure 51 Interrupter Clamp Fastening Procedure Figure 50 VS10006 2000A Vacuum Interrupter Terminal Holding Wrench Terminal Clamp Torque Wrench Position of Torque Wrench to Avoid Undue Stressing of Moving Terminal P P Direction of Force Courtesy of NationalSwitchgear com ...

Страница 45: ...ld shunts to Pole Bottom socket head capscrew Socket Head Capscrews 43 Overhaul Figure 52 Gaging Procedure and Stroke Adjustment Figure 53 VS 15050 1200A Figure 54 VS 15050 2000A and 3000A with sperate phase barriers Figure 55 VS 15050 3000A with chair Support Design Courtesy of NationalSwitchgear com ...

Страница 46: ...f manual charging and manual closing and tripping Lubrication 1 Evidence of excessive wear 2 Lubrication of wear points Electrical Controls Wiring 1 Mechanical damage or abrasion Terminals and Connectors 1 Tightness and absence of mechanical damage Close and Trip Solenoids Anti Pump 1 Automatic charging Relay Auxiliary Switches Secondary Disconnect 2 Close and trip with control power Spring Chargi...

Страница 47: ...solenoid 52SRC 1 Secondary control circuit de fails to energize No sound of energized or control circuit fuses breaker closing blown Correct as indicated 2 No closing signal to secondary disconnect pin 13 Check for continuity and correct relay logic 3 Secondary disconnect contacts 13 or 15 are not engaging Check and correct as required 4 Failure of anti pump relay 52Y contacts 21 22 or 31 32 or 13...

Страница 48: ...d correct relay logic 4 Secondary disconnect contacts 1 or 2 are not engaging Check and replace if required 5 Failure to trip coil 52T Check and replace if necessary 6 Auxiliary switch NO contacts 1 2 or 5 6 are open when breaker is closed Check linkage and switch Replace or adjust as necessary Tripping coil 52T energizes No trip 1 Failure of tripping spring or its ping sound is heard and breaker ...

Страница 49: ...omentary rating available for special application 2 Maximum voltage for which the circuit breaker is designed and the upper limit for operation 3 K is the ratio of the rated maximum design voltage to the lower limit of the range of operating voltage in which the required symmetrical and asymmetrical interrupting capabilities vary in inverse proportion to the operating voltage 4 3000A ratings with ...

Страница 50: ...cuit I 4 5 kA rms 31 5 40 50 40 25 31 5 40 50 sym Interrupting Time ms 83 5 83 5 83 5 83 5 83 5 83 5 83 5 83 5 Cycles Permissible Tripping Delay Y Sec 2 2 2 2 2 2 2 2 kA rms Max Sym Interrupting I sym 31 5 40 50 40 25 31 5 40 50 dc Component 47 47 47 47 47 47 47 47 Short Time Current I 3 seconds kA rms 31 5 40 50 40 25 31 5 40 50 Closing Latching Momentary Asymmetrical 1 55 x I kA rms 49 62 78 62 ...

Страница 51: ...s Current Amperes 120 VAC 240 VAC 48 VDC 125 VDC 250 VDC Non Inductive Circuit Interrupting Capacity in Amperes Breaker Auxiliary Switch 20 20 20 20 10 2 TOC Auxiliary Switch 15 15 10 0 5 0 5 0 2 MOC Auxiliary Switch 20 15 10 10 10 5 Inductive Circuit Interrupting Capacity in Amperes Breaker Auxiliary Switch 20 20 20 20 10 2 TOC Auxiliary Switch 15 15 10 0 5 0 5 0 2 MOC Auxiliary Switch 20 15 10 1...

Страница 52: ...tion Inc 7000 Siemens Road Wendell NC 27591 USA 1 800 347 6659 www usa siemens com energy SGIM 3268H 2006 Siemens Power Transmission Distribution Inc All rights reserved Subject to change without notice Courtesy of NationalSwitchgear com ...

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