Siemens 15-GM1-500 Installation Operation & Maintenance Download

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Summary of Contents for 15-GM1-500

Page 1: ...SIEMENS Instruction Installation Operation Maintenance 5kV and 15kV Vacuum Circuit Breakers Type GMI SG 3268 02 o3 o Z Courtesy of NationalSwitchgear com ...

Page 2: ... 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 safety glasses or face shields flash clothing etc in acco...

Page 3: ...ecommended Hand Tools Recommended Maintenance and Lubrication Removal from Switchgear Checks of the Primary Power Path Cleanliness Check Inspection of Primary Disconnects Checks of the Stored Energy Operator Mechanism Maintenance and Lubrication Fastener Check Manual Spring Charging and Contact Erosion Checks Damper Assembly Check Electrical Control Checks Check of the Wiring and Terminals Check o...

Page 4: ...eaker after the spring charged mechanisms are discharged except for test of the charging mechanisms 3 Always let an interlock device or safety mechanism perform its function without forcing or defeating the device ADANGER Powercircuitbreakersoperateathighvoltages and have spring loaded mechanical parts which operate at high speed When operated improperly this equipment willcausedeath personalinjur...

Page 5: ... Storage Outdoor storage is not recommended When no other option is available the circuit breaker must be completely covered and protected from rain snow dirt and all other contaminants Space Heating Space heating must be used for both indoor and outdoor storage to prevent condensation and corrosion When stored outdoors between 150 to 200 watts per breaker of space heating is recommended If the ci...

Page 6: ...ccomplishes the same result control power is dis connected Spring Discharge Check Figure 2 Perform the Spring Discharge Check before removing the circuit breaker from the pallet or removing it from the switchgear The spring discharge check consists of simply performing the following tasks inthe order given Thischeck assures that both the tripping and closing springs are fully discharged 1 Press re...

Page 7: ...gure 4 The wheels of the circuit breaker are virtually at floor level unless the switch gear is installed on araised pad and one personcan easily handle the unit Removal from Upper Cell Indoor and Shelter Clad Out door Switchgear Removalof theupper breaker inatwo high assembly is similar to removal of a breaker from a lower cell with several additional steps Figure 5 shows one of the two breaker e...

Page 8: ...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 breaker primary contacts are open by indicator positions Automatic Spring Charging Check Note A temporary source of control power and test leads may be required if the control power source has not been con nected to the switchgear Refer to the spec...

Page 9: ... are discharged and the primary contacts of the GMI circuit breaker are open Final Mechanical Inspections without Control Power 1 Make a final mechanical inspection of the circuit breaker Verify that the contacts are in the Open position and the closing springs are Discharged 2 Check the upper and lower primary studs and contact fingers shown in Figure 9 Verify mechanical condition of finger sprin...

Page 10: ... interlock devices disconnect devices to connect the 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 sectiondescribesthe operationof eachmajor subassem bly as an aid in the operation installation maintenance and repair of the GMI vacuum circuit breaker FIXED CON...

Page 11: ...circuit breaker ratings These four plates of glass polyester insulating material are attached to the circuit breaker and provide suit able electrical insulation between the vacuum interrupter pri mary circuits and the housing Stored Energy Operating Mechanism The stored energy operating mechanism of the GMI circuit breaker is an integrated arrangement of springs solenoids and mechanical devices de...

Page 12: ...chet pin reacnes the 6 o clock position the closing springs are fully charged Driving pawl 24 1 is disengaged the spring condition indicator cam 18 has rotated allowing the spring charged flag 132 to drop into the lower charged position which also operates the motor cutoff switch LS1 and spring charged switch LS2 258 see Figures 17a and 27 The closing springs are restrained fully charged by close ...

Page 13: ...ing into its charged position Trip Free Mode If at any time during breaker closing the trip shaft 79 Figure 14a operates as a result of either an electrical or mechanical trip trip hatchet 99 is free to rotate When the trip hatchet 99 rotates cam follower 115 is displaced by drive cam 20 without motion of the jack shaft 217 Mechanical trip free operation is provided by manual tripping electrical t...

Page 14: ...h also operates the motor cutoff switch LS1 and spring charged switch LS2 258 see Figures 17b and 27 The closing springs are restrained fully charged by close hatchet 22 against close shaft 72 Closing Mode Figure 17b Energizing the close solenoid 265 pulls the solenoid armature against the closing shaft actuator 75 and causes the close shaft 72 to rotate approxi mately 15 If the closing springs ar...

Page 15: ...aft 79 Figure 14b operates as a result of either an electrical or mechanical trip trip hatchet 99 is free to rotate When the trip hatchet 99 rotates cam follower 115 is displaced by drive cam 20 without motion of the jack shaft 217 Mechanical trip free operation is provided by manual tripping electrical tripping and or the mechanical interlocks Opening Mode Opening or tripping the vacuum interrupt...

Page 16: ...e movable ends of the springs The fixed ends of these springs are attached to a support arm which in turn is bolted to the structure of the circuit breaker The opening spring is connected to the jack shaft When the circuit breaker closes rotation of the jack shaft causes the opening spring push rod tocompressandcharge theopening spring Consequently the opening spring is automatically charged whene...

Page 17: ...heclosingsignalremoved interrupted before the close solenoid can be energized the second time When thetrip solenoid isenergized it allowsrotationof the jack shaft by the tripping spring This rotation pulls the insulating push rods attached to the movable contacts of the three vacuum interrupters and the circuit breaker contacts are opened Electrical connections to the close solenoid and trip solen...

Page 18: ...rcuit breaker as it is racked into the Connect position Various combinations of a and b contacts may be optionally specified These switches provide control and logic indication that a breaker in the cell has achieved the Connect ready to operate position Auxiliary Switch Figure 24 shows the breaker mounted auxiliary switch This switch provides auxiliary contacts for control of circuit breaker clos...

Page 19: ...or Connected position or is out of the compartment and 5 Limit switch LS2 indicates that the closing springs are charged Electrical tripping occurs with tripping control power applied and when the auxiliary switch 52a shows the breaker is closed and a trip signal is provided by the control switch CS T or the protective relays While external control power is required for either electrical closing o...

Page 20: ... Control Switch Close T CS T Control Switch Trip R Red Indicating Lamp G Green Indicating Lamp W White Indicating Lamp Notes on Schematic Arrangement Schematics are shown with 1 Closing Springs Discharged 2 Breaker Open 3 Breaker Located in Test Con nect or Withdrawn Position Note that in this condition the trip latch is free to reset but is tempo rarilyblockeduntiltheclosingsprings are partially ...

Page 21: ...r 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 magni tude of charge current flowing into the capacitor The charged capacitor is then connected across the breaker trip coil circuit through an external contact which closes upon trip command The capacitor size and chargecurrent magnit...

Page 22: ...o a cubicle intended for a breaker of higher ratings Trip Free Interlock Figure 30 shows the devices providing the trip free interlock function The purpose of the trip free interlock is to hold the circuit breaker operating mechanism mechanically and electrically trip free whenever the breaker is between the Test and Connected positions within the switch gear enclosure This interlock ensures that ...

Page 23: ...ntrol Checks High Potential Test Inspection and Cleaning of Breaker Insulation Functional Tests For the safety of maintenance personnel as well as others who might be exposed to hazards associated with maintenance activities the safety related work practices of NFPA 70E parts 11 and III should always be followedwhen workingon electrical equipment Maintenance personnel should be trained in the safe...

Page 24: ...ects Figure 34 shows the primary disconnect contact fingers engaged When the con tacts are mated with the switchgear s primary stud assembly there is forceful contact distributed over a wide area This maintains low current flow per individual contact finger Inspect the contact fingers for any evidence of burning or pitting that would indicate weakness of the contact finger springs Inspect the prim...

Page 25: ...ver charges the closing springs Continue cranking until the Charged flag appears in the window of the spring indicator 2 Press the Close black pushbutton The contact position indicator on the operator control panel should indicate that the breaker contacts are closed 3 Perform the contact erosion check Contact erosion occurs when high fault currents are interrupted or when the vacuum interrupter i...

Page 26: ...s 1 Physically check all of the breaker wiring for evidence of abrasion cuts burning or mechanical damage 2 Check all terminals to be certain they are solidly attached to their respective device Check of the Secondary Disconnect In additionto checking the terminals of the secondary disconnect the secondary contact fingers need to be free to move without binding Depress each finger confirm presence...

Page 27: ...the standoff insulators and the insulated drive links as well as theinsulating tension struts between the upper and lower vacuum interrupter supports If these insula tion components are contaminated or defective the test volt age will not be sustained If so clean or replace the affected components and retest As Found Insulation and Contact Resistance Tests As Found tests verify the integrity of th...

Page 28: ...zero volts gradually 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 contacts using a ductor Contact resistance should not exceed the v...

Page 29: ... The opening spring may be removed and replaced without the need to use a spring keeper or compression aid The opening spring assembly consists of the top and bottom spring caps threaded coupling rod with nuts and a support ing shelf The shelf features location holes and tabs which work in concert with supports in the breaker frame to secure the shelf WARNING h Hazardous voltages and high speed me...

Page 30: ...al of this procedure allows re assembly Note that the jam jut at the lower end of the threaded coupling rod is located so that there is 0 75 thread engagement of the jack shaft The top nut above the upper spring cap is located so that the top surface of the spring cap is 0 50 from the end of coupling rod When re assembling apply upward pressure to the shelf over stationary support and to engage th...

Page 31: ...t the trip shaft actuator Confirm that the switch is vertically aligned to ensure that it will not be struck by the closing hatchet or the trip shaft actuator This mechanism can be identifiedby observing the close latch above the spring charging motor on the left side of the circuit breaker Refer toFigure18b Theclosehatchet 22hasa latch face which bears directly on the close shaft 72 If the close ...

Page 32: ... security the jam nut is treated with a threadlocking adhesive Loctite 271 with Loctite type T primer and then torqued to a value of 17 20 ft lbs Check all associated parts damper body and telescoping tube for wear Replace as necessary The telescoping tube and internal striker block employ slugs in variable thicknesses and quantity to control movable contact motion If the telescoping tube is repla...

Page 33: ...val Breaker Side Elevation Typical Tube Clamp Fastening Procedure Gaging Procedure and Stroke Adjustments 46 51 Circuit breakers rated 1200 amp using the VS12015 or VS25002 Interrupters Figure 48 Using an 19mm socket and extension remove bolt fastening vacuum tube stationary contact to the upper primary connectors and upper stab suppoh Save bolt washer and lockwasher Carefullyremoveandsetasidetheh...

Page 34: ...ess Wipe clean with solvent and clean rag Do not abrade 12 Insert vacuum tube replacements into the lower stab sup port with the evacuation nipple or tubulation oriented as follows VS12015 VS25002 VS10006 VS10028 Fasten two 3 8 fasteners securing the primary exten sions 26 36 ft lbs 14 3 VS10006 Interrupter in 2000 AmpBreakers Figure 50 With tube aligned under the primary stab place the 3 8 copper...

Page 35: ...pri ate when held firmly on the trunnion will just contact the lower surface of the bell crank shaft at the correct open position Figure 52 Note Stationary contact is annealed copper Thread damage will occur if threads are crossed Be sure the bolt can be fully engaged with light manua torque Fasten the insulating support plate to the upper primary stab support Use four hex socket flat head screws ...

Page 36: ... 19mm 24mm Ratchet 2 Extensions 6 maximum Torque Wrench 0 150 ft lbs Hex Socket Keys 5 16 0 156 socket type preferred Miscellaneous Pliers Hot Air Gun Loctite Threadlocker 262 Loctite Primer T Allen Wrenches 8mm 10mm Figure 46 GMI Breaker Side Elevation Typical STAB SUPPORT TLF TUBE T CONTACT STATIONARY PRIMARY EXTENSION TUBE CLAMP INSULATING CENTERING RING SPACER SHIM WASHERS TRUNNION Figure 47 V...

Page 37: ...1200 and 2000 Amp POST INSULATOR STAB SUPPORT PRIMARY _ EXTENSION l 13 x HEX SOCKET FLAT H A0 SCREWS TUBULATION k TUBE CONTACT STATI0UARY PRIMARY SUPPORT PLATE Figure 51 Tube Clamp Fastening Procedure INSULATING CENTERING BLOCK i I i i L 031SHIM WASHERS SPACER SPECIFIED FOR WEAKER uta m i t i i SHAFT V amS vil0028A 11mm VSIOCO fc i 1 r i So OPEN ADJUSTMENT 1 o t u CLOSE ADJUSTMENT SHIM WASHERS Ti ...

Page 38: ... absence of mechanical damage 1 Automatic charging Vacuum Interrupter Primary Power Path Primary Disconnects Vacuum Interrupter Contact Resistance Cleanliness Fasteners Interrupter Operator Mechanism Manual Spring Check Lubrication Electrical Controls Wiring Terminals and Connectors Close and Trip Solenoids Anti Pump Relay Auxiliary Switches Secondary Disconnect 2 Close and trip with control power...

Page 39: ...rgize No sound of breaker closing 1 Secondary control circuit de energized or control circuit fuses 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 14 Check and replace as re...

Page 40: ... NO contacts 1 2 or 5 6 are open when breaker is closed Check linkage and switch Replace or adjust as necessary 1 Failure of tripping spring or its mechanical linkage Check and replace if required Nuisance or false close Electrical problem Mechanical problem Tripping coil or solenoid 52T does not energize There is no tripping sound Circuit breaker will not trip Tripping coil 52T energizes No trip ...

Page 41: ...ble for special application 2 Maximum voltage for which the breaker is designed and the upper limit for operation 3 K is the ratio of rated maximum voltage to the lower limit of the range of operating voltage in which the required symmetrical and asymmetrical interrupting capabilities vary in inverse proportion tc the operating voltage 4 3000 ampere units available with increased fan cooled rating...

Page 42: ...1993 current is 23A Table A 3 Interrupting Capacity Auxiliary Switch Contacts Control Circuit Voltage Continuous Current Amperes Type Auxiliary Switch 240 VAC 48 VDC 125 VDC 250 VDC 120 VAC Non Inductive Circuit Interrupting Capacity in Amperes 20 10 2 Breaker Auxiliary Switch 20 20 20 0 5 0 5 0 2 TOC Auxiliary Switch 15 15 10 10 10 5 MOC Auxiliary Switch 20 15 10 Inductive Circuit Interrupting Ca...

Page 43: ...trical Apparatus Division P O Box 29503 Raleigh NC 27626 0503 SIEMENS 1994 Siemens Energy Automation Inc SIEMENS is a registered trademark ot Siemens AG Bulletin SG 3268 02 2M1194SP Printed in U S A O Courtesy of NationalSwitchgear com ...

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