GE ML-18H, Instructions Manual

Page 1: ...Vacuum Circuit Breaker Spring Operating Mechanism ML 18H ...

Page 2: ...tructions 28 9 8 Breaker Removal 28 14 14 15 15 15 Section 5 Operation 5 1 Close Spring Charging 5 2 Closing Operation 5 3 Opening Operation 54 Trip Free Operation 5 5 Control Circuit 21 16 16 16 16 17 17 17 17 Section 6 Measurements Adjustments 6 1 Wipe Adjustment 6 2 Emergency Trip 6 3 Primary Contact Erosion Indication 6 4 Contact Gap Adjustment 6 5 Control Coil Plunger Travel Trip Coil Close C...

Page 3: ...VENT ENERGIZING Many acci dents have been causedby back feeds from a wide variety of sources 2 Although interlocks to reduce someof the risks are provided the individual s actions while perfonning service or maintenance are essential to prevent accidents Each person sknowledge mental aware ness and planned and executed actions often detennine if an accident will occur The most iln portant method o...

Page 4: ...ndling of electrical equipment Immediately upon receipt of a breaker an examination should be made for any damage sustained during shipment If injury or rough handling is evident a damaged claim should be filed by the receiver at once with the transportation company and the nearest GeneralElectric SalesOffice should be notified 2 2 Handling Nonnal care in handling the breaker will result in a trou...

Page 5: ...protective relays Relayingtransformers are of the multi ratio type having five leads which provide a wide range of ratios Ratio accuracy classification for standard transformers are in accordance with ANSI C 57 13and NEMA SG 4 table 3 5specifications Figure2 Low Voltage Compartment Mechanism Side Additional mechanism features shown in Figure 2 are the open lose and charged lischargedindicators ope...

Page 6: ...liary switch contactschange position will rotate the trip latch and permit the circuit breaker to open hIlly The linkage will reset as in a normal open operation and the closing spring will recharge Breaker Open Spring Discharged A 4 TRIP ROLLER 5 CLOSING CAM 6 TRIP LINK 7a CLOSING TOGGLE 7b CLOSING TOGGLE 8 PROP SPRING 9 LINKAGE RETURN SPRING 10 CLOSING ROLLER 11 PROP 12 OUTPUT CRANK 13 JACKSHAFT...

Page 7: ...Distribution Breaker Section3 Description 7a C Breaker Closed Spring Discharged D Breaker Closed Spring Discharged 7 ...

Page 8: ...rtment RelaySide 8 must be opened and the lever reset manually to release the tI ip button A Pull to trip knob is provided on the outside of the mechanism door for emergency tripping of the circuit breaker When the breaker is tripped by means of this knob a small lever on the front of the mechanismframe is spring operated to hold the trip button depressed so that the trip latch cannot reset and th...

Page 9: ... ML 78HMechanism 1 CLOSE SPRING 2 CAM SHAFT 3 MANUAL CHARGE 4 CHARGING ARMS 5 RATCHET WHEEL 6 DRIVING PAWL 7 ONE WAY CLUTCH 8 CLOSE LATCH 9 CLOSE CAM 10 CLOSE ROLLER 11 PROP 12 OUTPUT CRANK 13 CROSS SHAFT 14 BELL CRANKS 15 OPENING SPRINGS 16 WIPE SPRINGS 17 AUX SWITCH 18 TRIP SOLENOID 19 TRIP LATCH 20 OVER TRAVEL STOP 21 LATCH CHECK SWITCH 22 GEAR MOTOR Continued on next page 9 ...

Page 10: ...Distribution Breaker Section 3 Descriotion LI L2 CXRECTaoIJ ROTATION PARTIAL VIEW B B D I D 21 II1II PARTIAL VIEW C 6 PARTIAL VIEW D PARTIAL VIEW E Figure5 PartialViewsof ML 18Mechanism 10 ...

Page 11: ...ions are shown on the breakeroutline drawings 4 5 Primary Connections Leads should be bought down from above if possible Ample electrical clearance must be provided between these leads and parts of the station such as wall channels and framework Leads sholud be properly supported so that the breakerbushings are not subjected to unnecessarystrains The bushings sholud not carry cable or bus bar stra...

Page 12: ...es until closing roller Fig 3 10 is free from the closing cam and resting on the close prop Fig 3 11 III 4 7 Slow Closing 1 Manually charge the breaker closing spring using the charging handle provided Fig 6 The closing spring is charged by a ratcheting mechanism that advancesby one ratchet tooth at a time When the spring is fully charged and the spring load is held by the closing latch the spring...

Page 13: ...peration apply control voltage to the circuit breaker Check the control voltage on the nameplate and close and open the breaker severaltimes to checkelectricaloperation 4 Leave the circuit breaker in an open and spring discharged condition after checksare complete Si8 iltPWo _ DETAIL B s P bCT J I DMO 0 PLAN VIEW A A QI I 25 NOTES 1 18 00isStandard Leg Height ForOtherLegHeights ie 12 24 30 36 Adju...

Page 14: ...ed the trip latch will be held out of position At latch checking switch Fig 5 view C 21 will not close unless the latch is in its normal position The contacts of latch checking switch are in the closing circuit so that electrically initiated closing is blocked when the trip latch is not reset 5 4 Trip Free Operation The linkage is mechanically trip free in any location on the closing stroke This m...

Page 15: ...o the surfaceof the operating rod insulator as shown in Figtlre 10 Using a reference block make a mark on the tape near the top on all three poles It is also advisable to put a reference mark on the tape to identify to which pole the tapeisapplied Removethe closing spring gagplate and closethe breaker Using the sameprocedure as above re mark the tape This new mark will be near the bottom of the ta...

Page 16: ...he portable breaker lift trIlck 6 5 Control Coil Plunger Travel Trip Coil With the breaker in the open position and the closing spring in the charged position make certain that the trip linkage and trip shaft move freely over the full plunger travel Fig 12 Control Switches There are three switch locations on the ML 18H mechanism SeeFigllre 14 The CL MS closing latch monitoring switch 13 is to the ...

Page 17: ... in closed position with no contact erosion Figure 11 Erosion Indicator CTUATOR ARM TRIP ARM ACTUATOR ARM I IP ARM TRIP PIN I e ADJUSTING NUT I LOCKING CLIP BENDCORNER I AGAINST TRIP PIN ADJUSTING NUT LOCKING BENDCORNERAGAINST CLIP ADJUSTING NUT ADJUS TING NUT T L ftt COil ASH DEPRESS PLUNGER l TO 25 8gg L GAP lL PLUNGI j 1 BASE 1 STOP BRACKET 1 tkl COIL ASH rDEPRESS PLUNGER 1 TO 25 8 GAP tb r PLU...

Page 18: ...1 0 1r 0 0 X I ZZ a I I O O U I 1 III I U on on In N a m a 4 aU4 4 C JCC rp I 1 4 o am 0 E c 0 0 u U u U UUUID U lOTI I I I I I I I I l J N n O O I II N J J C I U 0 I 0 m tAl In 0 a J a U J a g J j J 0 0 0 r 1 0 W1 N N 00 In B 1 tAl a a In a o H N e Z III 0 III iii Z 0 III 1 Z 0 UO Z I Z I u _N 1111 Z O cnmo Z 1 a 1 U I 1 cn O o U 0 0 Z Z II 1 I G a uo u X N o _ u 0 I I Z zcn I 0 II N iii C cn 1 I...

Page 19: ... close and trip signal and a minimum re close operation may be checked by tripping a charged breaker openwhile maintaining a closesignal Instantaneousre closetime 100 150 Milliseconds If the closedcircuit voltage at the tenninals of the coil or motor does not fall in the specified range check the voltage at the sourceof powerand line drop betweenthe powersourceand breaker Time from application of ...

Page 20: ... V I STOP CENTER SEE TABLE 2 ITEM 7 Figure 14 Mechanical Adjustments and Settings Continued on next page c 91 ...

Page 21: ...ITCH postI998 NO ADJUSTMENT REO 0 I sUPPORT R j t ACTUATOR RO 1 u u l STACK SWITCH 21 F ii 1 I CLMS SWITCH ADJUSTMENT FOR BREAKER DESIGNATION TYPE 0 AND 1 NO ADJUSTMENT FOR BREAKER DESIGNATION TYPE 2 J PlUNGER J S TCH Boor I _ D31 000 LCS SWITCH pre 1998 Figure 14 Mechanical Adjustments and Settings Continued 22 ...

Page 22: ...r from thewire to grolmd The primary circuit insluation on the breaker may be checked phase to phase and phase to ground using a 2500Vmegohmeter Since definite limits cannot be given for satisfactory insulation values a record should be kept of the megohmeter readings as well as temperature and humidity readings This record should be usedto detect any weakening of the insluation from one check per...

Page 23: ...ltage and that voltage maintained for 00 seconds The voltage should then be returned to zero and the hi pot machine removed from the circuit NOTE Do not exceed the test voltage indicated for the applicable breakervoltagerating If the testshould experience a failure STOP turn off the testsetand discharge the breaker circuit I Check the testsetllp and leadsfor connection errors 2 Wipe down the break...

Page 24: ...eakers in the same open breaker testprocedure used for oil circuit breaker These testsare rated on the basisof dielectric loss The power factor for each bushing of porcelain design is tested at room temperaUlre 23 degrees C and should not exceed3 Power factor testing of the vacuum interrupter is not recommended because of the low charging currents The Watt loss measurement across the open vacuum i...

Page 25: ... on actuator arm just makes contact with trip arm 2 Check that gap between coil assy plunger base is 25 000 050 3 Turn adjusting nut to meet setting _cl ip over after final setting 2 Close coil Open Charged Discharged 1 Depress coil plunger until latch actuator just makes contact with close latch pawl 2 Check that gap between coil assy plunger base is 25 000 050 3 Turn adjusting nut to meet settin...

Page 26: ...ches Control switchesmay be removed from their mounting bracketsby disconnecting the wires and removing the two mounting screws Usea small screwdriverto remove and replace the switch on the bracket checking that the correct type normally open or normally closed is used Re install wire and adjust per Section 6 Control Switches 9 5 Trip Coil Replacement Tools Required 5 16 Allen wrench 9 16 combinat...

Page 27: ... catalog number if listed reference number if listed and description of each part ordered and this instruction book number 9 6 Closing Coil Replacement 3 Standard hardware such as screws bolts nuts washers etc is not listed in this manual Such itemsshould bepurchasedlocally 4 For prices or information on parts not listed in the RenewalPartsList refer to the nearestoffice of the GeneralElectric Com...

Page 28: ...04 0177C5050GOO5 Description Charging Motor 48V DC 125V DC and 120V AC 250V DC and 240V AC Relay 48V DC 125V DC 250V DC 120V 50 60 Hz 240V 50 60 Hz 0282A7350POO1 0282A7350POO2 0282A7350POO1 0282A7350POO3 0282A7350PO04 0 Trip Coil 5 Cycle 48V DC 125V DC 250V DC 340V AC 0209B8104GOO1 I 0209B8104GOO2 0209B8104GOO3 0209B8104GO04 0209B8104GOO1 0209B8104GOO7 0209B8104GOO6 0209B8104GO04 u Trip Coil 3 Cyc...

Page 29: ...lai andRell acement X 1000 f OPE SPEED 12 X t Ysec FOR eRE AKERS EOUIPPED WITH oN DPENING DASHPOT THERE IS VIRTU L L Y NOOVERTRAVEL OR REeOUND See Figure 19 Figure 17 Sample Operating Speed Graphs Figure 18 VacuumInterrupter Assembly 30 ...

Page 30: ...Distribution Breaker Section 9 Reoair andReolacement c VIEWa PHASE 2 LOC ING FROM Sl X BREAKER Figure 19 Travel Recorder Auxiliary Linkage R R R R c 31 ...

Page 31: ... J GElndustrial Systems General Electric Company Switchgear Operation 510 East Agency Road West Burlington Iowa 52655 1999 General Electric Company GEK l05495A 2 99 ...