GE AKR Series, Maintenance Manual Supplement

Page 1: ...nance instructions on the AKR breaker models and trip devices listed in Table 1 IAB T I Frame Size Amp Breaker Type Mounting Trip Device Type Stationarv Drawout ECS ssr 800 AKR 4 30 30H AKR 4A 30 3OH X AKR 5 30 30H AKR 5A 30 30H x AKRU 4A 30 X AKRU 5A 30 X 1600 AKR 4 50 50H AKR 4A 50 50H X AKR 5 50 50H AKR 5A 50 50H X AKRU 4A 50 x AKRU 5A 50 x 2000 AKRT 4 50 AKRT 4A 50 x AKRT 5 50 AKRT 5A 50 X Int...

Page 2: ...16 Troubleshooting 77 SST Test Set TAK TS1 18 False Tripping Ground Fault 19 Replacement of Current Sensors 19 Flux Shift Trip Device 20 Cabling Diagrams 22 Ground Fault Defeat Cable 23 Type ECS Overcurrent Trip Device 24 Components 24 TripCharacteristics 25 Cabling Diagram 26 ECS SST Time Current Curves 27 fhese inslruclions do nol purporl lo cover oll detoils or voriations in eguipmenl nor to pr...

Page 3: ...ary stud details the external Hx W xD dimensions are identical Accordingly a majority of the AKR 50 in formation now in publication GEK 7310 applies equally to the new types Therefore to avoidneedless repetition the scope of this supplement is confined principally to that descriptive and instructional material unique to the new models Unless noted to the contrary or otherwise discussed herein the ...

Page 4: ...he respective frames However each breaker carries a specificrating whichis determined by the current sensor rmpere rating or tap setting of tt trip device with which it is equipped EXAMPLE An AKR 5A 3O breaker with SST sensor tap set on 1004 is rated 100A Short cir cuit ratings vary with the applied system voltage OTZ V systems they are atso Oependent upon whether the overcurrent trip device conta...

Page 5: ...igure 2 shows the rejection pin and bracket combinations employed As determined by its in tended breaker type each drawout c ompartment has its rejection pin or pins installed in one of three positions A B or C front to rear along the slide rail s Referring to Views 2 and 5 note that only the AKR 30H and 50H types employtwopins one in each slide rail The other breaker types use a single pin in the...

Page 6: ...acket If the link is too long the handle stroke cannot extend the closing spring enough for it to go over center In this event use the maintenance handle to complete the spring charging The breaker can then be closed and opened preparatory to further shortening of the link If the link is too short one stroke charging is not possible However more than one stroke will charge the springs CONTACT MAIN...

Page 7: ...rs signi ficantly from that of the AKR 50 frame size Each pole consists of a single movable contact arm acting against five stationary contacts arranged vertically as shown in Fig 5 Proceedingfrom top to bottom 1 Movable contact arm 2 Stationary main contact 3 Stationary arcing contact Fig 6 AKR S1H contact structure the first two contacts serve as the arcing contacts and the bottom three are the ...

Page 8: ...n contacts in stead of six Constructionally however the upper stud assembly movable contact arms and pivot block are unique to the AKRT 50 See Figs 8 and 9 The two movable contact arms are pin coupled to a metal driving link whose opposite end is threaded and screws directly into the insulating link This arrangement omits the wrench operated wipe adjustment stud provided on the AKR 30 and 50 frame...

Page 9: ... 8 AKRT 5 contact structure 1 Movable contact arm 2 StationarY main contact 3 Stationary intermediate contact 4 StationarY arcing contact 5 Driving link 6 Insulating link I 7 CouPling Pin DRIVING LINK Fig 9 AKRT 7 Mouable contact piuot bloch ...

Page 10: ...ming a hook on the end of a length of 1 76 tnch diameter steel wire The two movable contact arms 4 are removed by drifting out pin 10 connecting them to the in sulated coupling 11 Right angle tru arc pliers are needed to remove and replace the tru arc re tainer on the end of the pin Next remove the fastening screws washers springs and pivot pin from the pivot below When replacing the arms ensure t...

Page 11: ...Power Circuit Breokers GEI 86134 IH Ttbicat mounting fm class ttLttfuse on AXnU TT and 50 breakers Fip 11 Mounting for 300 350 and 400A Cl ass J fuses on AKRU 3 breaksrs 11 ...

Page 12: ...al does not disturb the disconnectts clamping force adjustment 2 Remove the upper barrier 4 3 Detach the inboard end of the fuse by remov ing the turo 1 2 inch 13 bolts A ratchet and socket with a short extension will be required t2 Fi g 12 AKRU 0 breaker with special 25004 fuse 1 Special 25004 Fuse 2 Disconnect Key 3 Heat Sink 4 Upper Barrier 5 Primary Disconnect 4 Remove the heat sink 3 5 Remove...

Page 13: ...50 breaksr FRONT OF BREAKER FUSE TANGS EE W I FUSE IS ROTATED ISOO TO POSITION TANG BENEATH BREAKER STUD POSITIONED ON TOP PRIMARY DISCONNECT ASSEMBLY SEE FIG I3 MOUNTS DIRECTLY ON OUTBOARD FUSE TANG Fig 14 Plan uiew of AKRU S1 breahsr showing 25004 fuse tang positi ons i os osi 25OOA FUSE CAT NO GFgF25OO AK TANG BOLT HOLES IN USE 13 ...

Page 14: ... is for overload the second for short circuit actuated by the short time andinstantaneous elements andthe third for ground fault The latter is omitted on units without qround fault Each target pops out when its associated trip element operates to trip the breaker After a trip the popped target must be reset by hand However neglecting to reset does not aJfectnormal operation of any trip element or ...

Page 15: ... when taps are changed on the phase sensors those on the neutral sensor must be correspondingly positioned FIux Shift Trip Device a low energy electro m n receipt of a trip signal from the programmer unit trips the breaker by actuating the trip sha tt See Fig 22 All components except the neutral sensor are mounted on the circuitbreaker The phase sensors are located on the breaker s back frame The ...

Page 16: ... Amperes Sensor Tap SSf PROGRAMMER ADJUSTMET T RANCE Set Points Long Time Short Time fnstantaneous Pickuo Tf GROIjND FAULT z Seneor t mp t Trps ria 5 t ff Time Delav Band Seconds Pickup o l i Time Delav Band Seconds Pickuo 1t g Multipte of X Time Delav Band Seconds AKR 30 800 100 150 225 300 or 300 400 600 800 6 7 8 9 1 0 1 1 X Maximum 22 Intermed 10 Minimum 4 3 4 6 6 81 10 L or L 75 2 2 25 2 5 3 ...

Page 17: ... Testing is performed by either of two methods 1 Conduct high current single phase tests on the breaker using a high current low voltage test set NOTE For these single phase tests spe cinl cormections mustbe employedfor SST breakers equippedwith Ground Fault Any single phase i nfut to the ground differential transformer will generate cn zmwanted ground fault t output signal which utill trip the br...

Page 18: ...ng test the unit can remain attached to the breaker or may be completely re moved from it 18 CAUTION NEVER DISENGAGE THE T RNESS CONNECTOR FROM THE PRO GRAMMER UNIT ON A BREAKER THAT S ENERGIZED AND CARRYING LOAD CURRENT THIS WILL OPEN CIRCUIT THE CURRENT S ANSORS ALLOWING DANGEROUS AND DAMAGING VOLT AGES TO DEVELOP Test scope 1 Verify the time current characteristics and pickup calibration of the...

Page 19: ...rving 4 wire loads check that the neutral sensor is prop erly connected see cabling diagramFig 2 In particular 1 Verify that the neutral sensor has the same rating and tap setting as the phase sensors 2 Check continuity between tlle neutral sensor ald its equipment mounted se condary disconnect block Also check for continuity from the breaker mounted neutral secondary discormect block through to t...

Page 20: ...for the next trip signal The trip device requires only one adjustment thetrip rod length As shown in Fig 24 the clear ance between the trip rod end and the trip shaft paddle is gaged by a 0 125 inch diameter rod Ad 20 just gap to 0 125 inch 0 015 inch To adjust open the breaker and restore the breaker mechanism to its Reset position Loosen the jam nut rotate the adjuster end until the proper gap i...

Page 21: ...ers GEr 86134 _t tr1 Bottom view 1 Acfuator 2 Trip rod adjuster end 3 Trip paddle Fig 23 Flux shift trip deui ce components Top view 4 Trip shaft 5 Actuator arm 6 Reset linkage Fig 24 Trip rod adjustment o tzs ora ROD 2t ...

Page 22: ...E HARNESS CONNECTOR AMP 201298 1 _ J PROGRAMMER CONNECTOR AMP 201297 1 Fi g 25 Cabling Diagram SS nithout ground fault HARNESS CONNECTOR AMP 201298 1 Ir t IF IF IF IL I I t_______ PROGRAMMER A 8Jlf I Cabling Diagram SS with ground fault on S wire load 22 Fig 26 ...

Page 23: ...t z CURRENT SENSORS I o_5 oA f l 1 ro o B gj o_f L______ _ H oc g 3 Fl r L ii ofi d J J NEUTRAL I I SENSoR I H DIScoNNEcT i Gq L_t ffr ffr hll 4 Jlll t F lll e o Jlllf e o f illf _ Jlllt fft rlll ffJ Jlll ANY SST PROGRAMMER UNIT WITH GROUND FAULT ELEMENT ff o l L_t MALE END FEMALE END L__ I Cabling diagram with Ground Fault Defeat Cable inserted between breaher lnrness and SST Programmer Unit for ...

Page 24: ... for each of the tabulated ampere ratings which span the same range as SST 4 Neutral s enso rs ar e not r equir ed becaus e ther e is no Ground Fault function In all other respects the ECS trip device system operates and can be treated identically to SST This includes circuitry size construction com ponent location programmer unit set points per formance characteristics operatin g r ange quality r...

Page 25: ...r Type Frame Size Amperes X Trip Rating in Amperes Sensor Rating ECS PROGRAMMER ADJUSTMENT RANGE Set Points Long Time Short Time Instantaneous Pickup O 1 Multiple ofl Sensor amp e Rating Pickg L Muiiiple ofX Time Delav Band Seconds Pickup Multiple ofl Time Delav Band Seconds AKR 3O 800 100 150 225 300 400 600 800 6 7 8 q 10 1 1 X Maximum 22 Intermed 10 Minimum 3 4 5 6 8 10 L or 7 75 2 2 25 2 5 3 4...

Page 26: ...f Breokers FLUX SHIFT TRIP DEVICE PROGRAMMER UNIT l l t_______ 48V dc TO SCR ANODE HARNESS CONNECTOR AMP 201298 1 PROGRAMMER CONNECTOR AMP 201297 1 LOAD Fig 32 Cabling diagramfor ECS Trip Deui ce 26 Fig 33 ECS current sensor ...

Page 27: ...P t AKR 30 100 150 225 300 400 600 800 AKR 5o 300 400 600 800 1200 1600 AKRT 5o 8oo 1200 1600 2000 AK 75 1200 1600 2000 3000 AKR 75 l2oo 1600 2000 3000 3200 AK AKR lOO l600 2000 3000 4000 l r lxn low volrAcE PowER clRculr BREAKERS cud r oDelv t H rh h 9 L Fron 2m lo 7OC P oerqin Ambi nt rrxt DTLAY uNot t ong time deloy shoil timedeloy i i1 S 1 i Ll lll f i i Hil t l ond In stontoneour fime current...

Page 28: ...d Insronroneous Time currenr curves aKT AKRT 5o 800 r200 r600 2000 AK 75 1200 1600 2000 3000 C d opply or 50 H f AKR 75 1200 1600 2000 3200 Fron 2C b 70C P osr hm r Ambi nr AK AKR r00 r600 2000 3000 4000 AKIAKR LOW VOITAGE POWER CIRCUII BREAKERS SS T s LtD sTATE vERcuRREr rTRrp DE rcE GES 6033B Plog onnor sal Poinfi ilcxut totlli 6 7 1 9 L0 I LI nulhpl ol u i r nior l p hing x s ilingr high r lh n...

Page 29: ...el AK r5 70 roo l5o 2zs Ground Trip Time current Curves AK 25 70 100 150 225 ot 2OO 300 400 600 AKR 3O IOO I50 225 300 or 300 400 600 800 AK AKR 5o 3oo 400 600 8oo or 600 8oo l2o0 1600 tr 3 13 il TYPE AKR I OW VOITAGE POWER CIRCUIT EREAKERS 5ST tor o tTATE ovERcuRRE TTRtp DEvlcE GES 6034A Ground Fouh PickuD AK 15 25 5x 6x 8x 1 0x 1 5x 2 0x AKR 30 4x 5x 6x 8x I 0x l 2x AK AKR 5o 25x 3x 4x 5x 6x A 7...

Page 30: ... r600 2000 3000 4000 I I ilOTE 4th wle Grcund senror rop BUn be tet one 03 phdee lenFr lop GEr ERAr rrrcrnrc AK AKR I OW VOLTAGE POWER CIRCUIT BREAKERS 55T touo tTATE 0vERcuRRENT TRrp DE tcE Ground Trip Time curreni Curves Curver opply ot 50 60 Heilt t om ztr to 70C Prosronme Ambient AKT AKRT so 2x 25x 3x 4x 5x 6x AK 75 2x 22x 25x 3x 35x 4x AKR 75 2x 22x 25x 3x 35x 37x AX AKR 100 lgx 2x 22x 25x 27...

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Page 32: ...For f u rther information call or write Your local General Electric Sales Office or Distribution EquiPment Division 41 Woodford Avenue Plainville CT 06062 GEN ERAt ELEcTRIG ...