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ADDITIONAL INFORMATION REQUIRED FOR ANALYSIS OF MAJOR OR

SYSTEM RELATED FAILURE

(USE ADDITIONAL PAGES AS NECESSARY)

(1)

Single line station diagram showing involved breakers

(2)

Operation and timing sequence (including all alarms) of this and related breakers

from last time that conditions were definitely normal

(3)

Line conditions before, during, and after failure

(4)

Oscillograms - attach with explanation & interpretation

(5)

Attach a description of the exact position of all mechanical components from the control solenoid through all

interrupter contacts as applicable (photograph each in detail before mechanisms are moved, supply copies

of photos with report.)

(6)

Describe arc damage and location of arc products relative to valve seals, (photograph each in detail before

any clean up or post failure mechanism movement, supply copies of photos with report.)

(This form may be copied)

Содержание PowerVac GEK-86132G

Страница 1: ...1 GEK 86132G Instructions g PowerVac Vacuum Circuit Breaker with ML 18 or ML 18H Mechanism ________________________________________________________________________________ ...

Страница 2: ...Switch Adjustment 12 8 6 3 IL MS Switch Adjustment 13 Description Page SECTION 9 Electrical Checks 14 9 1 Electrical Operation 14 9 2 High Potential Test 14 9 2 1 Primary Circuit 14 9 2 2 Secondary Circuit 14 9 3 Primary Circuit Resistance 14 9 4 Vacuum Interrupter Integrity Test 14 9 5 Insulation Test 15 SECTION 10 Checking and Installing Breakers 16 SECTION 11 Maintenance 17 11 1 General 17 11 1...

Страница 3: ...nterlock 24 16 Toggle linkage positions of the ML 18 mechanism 25 17 Schematic of ML 18 mechanism 27 18 Typical wiring diagram for ML 18 mechanism 29 19 PowerVac breaker left front view 30 20 PowerVac breaker right rear view 30 21 Trip coil and linkage 31 22 Close coil linkage 32 23 Bottom view of the ML 18 mechanism 33 24 Flex cable connections 34 25 Negative interlock 34 26 Close latch stop 35 2...

Страница 4: ...ccidents is for all associated personnel to carefully apply a thorough under standing of the specific equipment from the viewpoints of its purpose its construction its operation and the situations which could be hazardous All personnel associated with installation operation and maintenance of electrical equipment such as power circuit breakers and other power handling equipment must be thoroughly ...

Страница 5: ...n the circuit breaker nameplate Mechanical and electrical interlocks are provided and are described in Section 4 2 Interlock SECTION 3 Receiving Handling and Storage 3 1 Receiving A Equipment Packages Every package leaving the factory is plainly marked with the case number requisition number and customer s order number If the equipment has been split for shipment the section numbers of the equipme...

Страница 6: ...owerVac breaker with front cover 1 Front cover 6 Manual charge lever 2 Cover mounting bolts 7 Counter 3 Manual trip button 8 Spring charge indication 4 Manual close button 9 Closing spring gag access 5 Nameplate 10 Open Close indicator The circuit breaker has been shipped in the CLOSED position After removing packing material open the breaker by pushing in firmly on the manual trip button item 3 F...

Страница 7: ...g the close circuit power The negative trip interlock is functional while the beaker is being moved between the DISCONNECT TEST and CONNECT position and upon withdrawal from the metalclad compartment 4 2 4 Positive Interlock Bar This interlock will prevent the racking of a closed breaker into or out of a metalclad compartment A linkage connected to the cross shaft extends a détente angle item 3 Fi...

Страница 8: ... and pawl assembly Advancement of one tooth spacing is provided for each oscillation of the system The ratchet motion is restricted to one direction by a spring loaded holding pawl that prevents the ratchet wheel from going backwards as the charging arms oscillate back to pick up the next tooth Thirteen complete cycles of the charging arms are needed for a full charge of the closing spring The eff...

Страница 9: ...n the breaker is racked between the connect and disconnect position the negative interlock roller is depressed as a result the IL MS switch is open and does not allow the motor to charge the closing spring Once the breaker is rack in the switch closes allowing the spring charge motor to charge the closing spring The close coil circuit is established through two normally closed 52Y relay contacts a...

Страница 10: ...tem 11 Figure 3 CAUTION FAILURE TO PUSH THE CLOSE BUTTON BEFORE CONTINUING THE SLOW CLOSE PROCEDURE WILL CAUSE DAMAGE TO THE MECHANISM After pushing the manual closing button put the manual charge handle on the manual charge lever and move the handle up and down The breaker will be fully closed when the spring charge indicator shows CHARGED CAUTION WITH THE GAG PLATE INSTALLED THE BREAKER CLOSED A...

Страница 11: ...eaker closed and the closing spring gagged Figure 7 Contact gap measure with a feeler gauge and record the distance between the bellville washer and the trunion between the bell crank arms 8 4 Contact Gap The method of measuring the contact gap is as follows With the breaker in the open position the closing springs charged and the closing spring gag plate installed apply a piece of masking tape to...

Страница 12: ... using a go no go gauge with the go end having a thickness of 200 inches and the no go end with a thickness of 251 inches With the armature depress until resistance is felt the go gauge must fit between the coil housing and the surface of the red PVC cap covering the steel plunger base With the armature in the same position the no go gauge must not fit between the coil housing and the plunger base...

Страница 13: ...ting bracket as shown in Fig 11 8 6 3 IL MS Switch adjustment The nut should be adjusted to fully extend the plunger AUXILIARY SWITCH STACK SWITCH NEGATIVE INTERLOCK BAR IL MS SWITCH SHIM PLACEMENT CLMS SWITCH ML 18 TYPE 0 1 2 CLMS SWITCH ML 18 TYPE 3 ML 18 H TYPE 0 Figure 11 Control Switches LCS SWITCH ...

Страница 14: ...ead a wire connecting all secondary disconnect pins except 24 the ground pin Connect the hipot machine from this wire to ground Increase the voltage to 1125 volts rms 60 Hz and maintain for 60 seconds Reduce the voltage to zero and remove the hipot machine from the circuit Remove the wire connecting the secondary disconnect pins and reconnect the motor leads 9 3 Primary Circuit Resistance A resist...

Страница 15: ...DIATION WILL BE PRODUCED Although a AC hi potential test is recommended for checking the vacuum integrity a DC hi potential test can also be conducted on the vacuum interrupter If a DC Hi potential test set is to be used test voltage should not exceed 50kV DC and should be applied for 10 seconds Interrupters must be cleaned as previously discussed If failure occurs reverse the polarity and retest ...

Страница 16: ... metalclad compartment NOTE When inserting the breaker and prior to racking the operator must ensure that both the right and left side racking arms are engaged on the drive blocks Racking arms must be fully engaged for breaker to rack in properly Failure to do so could result in jamming of the racking arms with the guide rail With the breaker in the CLOSED condition attempt to install the racking ...

Страница 17: ...be extended to 10 years or 10 000 no load or 5 000 normal load switching operations Mild service conditions are defined as an environment in which the switchgear is protected from the deleterious effects of conditions such as Salt spray Changes in temperature that produce condensation Conductive and or abrasive dust Damaging chemicals and fumes Vibration or mechanical shock High relative humidity ...

Страница 18: ...ommended Maintenance The following operations should be performed at each maintenance check 1 Perform a visual inspection of the breaker Check for loose or damaged parts 2 Perform slow closing operation described under MECHANICAL CHECKING AND SLOW CLOSING 3 Check the erosion indicator and the wipe and gap as described under DIMENSIONAL CHECKS 4 Perform the vacuum interrupter integrity test as desc...

Страница 19: ...monitoring control circuit voltage and using no more than six volts DC and one ampere through the vacuum interrupter contact to indicate closed or open condition Typical time ranges vary with coil voltage but nominal values are Initiation of trip signal to contact parting 32 45 Milliseconds 5 Cycle 25 30 Milliseconds 3 Cycle 2 Milliseconds maximum pole spread Initiation of close signal to contact ...

Страница 20: ...TE Tightening of the opening spring adjusting nut will decrease the closing time and speed while increasing opening time and speeds Loosening will have a reverse effect The operating speeds are as follows Operation Operation Operation Operation Feet Per Second Feet Per Second Feet Per Second Feet Per Second Open 5 0 nominal 4 5 minimum Close 3 5 nominal 4 0 maximum V I STOP CENTER PHASE Figure 13 ...

Страница 21: ...cator on c Advance operating rod two and one half 2 1 2 additional turns d Tighten lock nut to 40 50 foot pounds and the coupling clamp capscrews to 8 10 foot pounds e Check contact wipe must be 0 15 0 18 inch set all three phases before measuring It is not necessary that all three poles have the same wipe measurement as long as all three poles fall within the specified limits f Check contact gap ...

Страница 22: ...With the breaker open and the closing spring discharged remove retaining clip from auxiliary switch shaft or loosen clamping bolt in operating link Remove mounting hardware securing auxiliary switch to mechanism plate Slide auxiliary switch and shaft out of operating link Before removing any wires from switch terminals make sure they are properly tagged with switch terminal numbers to assure prope...

Страница 23: ...quired if wipe is more than 0 075 inch After adjustment the wipe should be 0 15 0 18 inch To adjust the primary contact wipe close the breaker and proceed as follows 1 Loosen but do not remove the two capscrews item 9 Figure 6 holding the interrupter clamp 2 Check that the interrupter clamp is loose A light pry at the clamp half junction may be required to loosen the wedging action of the clamp 3 ...

Страница 24: ...ats on head of bolt Step three is to check for proper holding of the latch on recharging of the closing spring If the latch fails to reset and hold the spring back the bolt out 1 or 2 additional flats All PowerVac circuit breakers with ML 18 mechanisms and a type designation ending in 3 have no adjustment bolt for the close latch ML 18H mechanisms also do no have adjustment bolts A permanent stop ...

Страница 25: ...rop spring 11 Linkage return spring NOTE Shading indicates fixed pivots B Breaker open spring charged Figure 16 Toggle linkage positions of the ML 18 mechanism Viewed from right side Continued on next page NOTE Orientation of closing cam item 9 in view A C are shown when operated by slow closing Under normal operation the cam may rotate further in the counter clockwise direction ...

Страница 26: ...26 C Breaker closed spring discharged D Breaker closed spring charged Figure 16 Continued ...

Страница 27: ...s shaft 3 Manual charge 14 Bell cranks 4 Charging arms 15 Opening springs 5 Ratchet wheel 16 Wipe springs 6 Driving pawl 17 Auxiliary switch 7 One way clutch 18 Trip solenoid 8 Close latch 19 Trip latch 9 Close cam 20 Over travel stop 10 Close roller 21 Latch check switch 11 Prop 22 Gear motor 23 Manual trip button ...

Страница 28: ...28 Figure 17 Continued ...

Страница 29: ...29 Figure 18 Typical wiring diagram for ML 18 and ML 18H mechanisms ...

Страница 30: ...pring discharge roller 5 Negative interlock roller 6 Rating interference plate 7 Front cover 8 Racking engagement lever 9 Secondary coupler 10 Secondary disconnect handle Figure 19 PowerVac breaker left front view Figure 20 PowerVac breaker right rear view 4 6 9 2 2 7 5 1 3 8 10 ...

Страница 31: ...31 Figure 21 Trip coil and linkage 1 Trip coil 2 Closing spring 3 Trip linkage adjusting rod and nut 2 3 1 ...

Страница 32: ...32 Figure 22 Close coil linkage 1 Close linkage adjusting nut 2 Close linkage adjusting rod 3 Link to close latch actuator 1 2 3 ...

Страница 33: ...switch 4 Spring charging motor 13 LCS latch checking switch 5 Trip coil 14 CL MS close latch monitor switch 6 Close coil 15 Stationary auxiliary switch operator 7 Ratchet wheel 16 Close latch adjustment screw 8 Closing cam on ML18 type 0 1 2 breakers only 9 52Y relay 17 Close linkage pivot 18 Spring discharge linkage 5 3 4 6 15 11 1 10 7 17 2 2 13 16 8 9 12 14 18 ...

Страница 34: ...34 Figure 24 Flex cable connections Figure 25 Negative interlock CAUTION This is a safety feature not routine maintenance MID BAND RING not on all Interrupters ...

Страница 35: ...h stop on ML 18 Type 0 1 2 only CAUTION This is a safety feature not routine maintenance A change in the setting of the close latch stop bolt will affect the adjustment of the spring discharge interlock Figure 27 Spring wipe ...

Страница 36: ...EE SECTION 13 19 TABLE 3 ADJUSTMENTS ITEM BREAKER CL SPRING OP SPRING MEASUREMENT PG CONTACT WIPE CLOSED CHARGED CHARGED ADJUST OPERATING ROD TO OBTAIN REQUIRED DIMENSION 23 CONTACT GAP OPEN DISCHARGED DISCHARGED ADVANCE OR RETARD GAP ADJUSTING NUTS TO SET GAP 23 CONTACT EROSION CLOSED DISCHARGED CHARGED ALIGN REFERENCE ARM WITH DISK ON NEW UNITS ONLY 11 TRIP COIL CLOSED DISCHARGED CHARGED TURN AD...

Страница 37: ...s 17 Service Conditions 17 Transfer Finger Wear 17 Measurements Table 2 36 Mechanical Adjustments 23 Close Coil Plunger 24 Close Latch Stop Bolt 24 Contact Gap 23 Negative Interlock 24 Spring Discharge Interlock 24 Trip Coil Plunger 24 Wipe Adjustment 23 Mechanical Checking and Slow Closing 9 10 Mechanism 17 21 33 Motor Replacement 22 N Negative Interlock 7 24 34 Negative Interlock Roller 24 O Ope...

Страница 38: ...Intentionally Left Blank ...

Страница 39: ...tion to Ground Internal Insulation to Ground Insulating Medium Isolating Contact Bushing Interrupter Seals Gaskets Air System SF6 System C T Resistor Sw or Aux Int Voltage Grading Device Line Terminals Compressor Heater Electrical Controls Wiring Operating Mechanism Mechanical Linkage Other _______________________________________________ ____________________________________________________________...

Страница 40: ... during and after failure 4 Oscillograms attach with explanation interpretation 5 Attach a description of the exact position of all mechanical components from the control solenoid through all interrupter contacts as applicable photograph each in detail before mechanisms are moved supply copies of photos with report 6 Describe arc damage and location of arc products relative to valve seals photogra...

Страница 41: ...Notes ...

Страница 42: ...Notes ...

Страница 43: ...Intentionally Left Blank ...

Страница 44: ...e desired or should particular problems arise which are not covered sufficiently for the purchaser s purposes the matter should be referred to the General Electric Company g GE Consumer Industrial ______________________________________________________ General Electric Company Switchgear Business Department 510 East Agency Road West Burlington Iowa 52655 GEK 86132G 2004 General Electric Company Las...

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