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MAIN TENANCE

The key can be removed in the open or closed

position of the breaker.

Inspection

Push the trip button and turn key to the

unlocked position to free the breaker trip

button.

The key is not removable in this

pos it ion.

Maintenance

locked position.

The key is then removable

The device is non- adjustable.

Check for

and the breaker is locked in the trip-free

loose bolts and nuts only.

position.

Replace key and rotate to the un-

locked position to free breaker trip button.

The key is also removed in this position.

Maintenance

The device is non- adjustable.

Check for

loose bolts only.

KEY INTERLOCK ATTACHMENT

The key interlock (Figure 18) closed mounts

on the right side of the operating mechanism
frame.

When the key interlock attachment is

furnished, the key lock attachment cannot be

supplied.

With the key interlock attachment

the key cannot be removed unless the breaker

is locked in the open position.

Inspection

Push the trip button and turn key to the

locked position.

The key is then removable

and the breaker is locked in the trip-free
position.

Replace the key and rotate to the

RECTIFIER UNIT FOR A-C UNOERVOLTAGE AND
A-C ELECTRIC LOCKOUT ATTACHMENTS

When an a-c undervoltage attachment or an

a-c electric lockout attachment or both are

required, a RECTOX unit is mounted underneath
the breaker platform under the undervoltage

device as shown in Figure 19.

An auto-trans

former  is  provided  in  the  unit  so  that  the
common  voltages  for  60  cycles  and  25  cycles
can  be  connected  to  the  appropriate  terminal
on  the  unit.

A terminal block is mounted on

the rectifier unit to facilitate all wiring.

Inspection

There are no moving parts.

Make certain

a-c incoming leads are connected to proper

terminals.

Maintenance

Check for loose connections.

I. B. 35- 240-1

www

. ElectricalPartManuals

. com

Содержание DB-75

Страница 1: ...s A C 250 Volts D C INTERRUPTING RATING 75 000 Amperes 600 Volts A C 100 000 Amperes 250 Volts A C November 1956 I B 35 240 1 I WESTINGHOUSE ELECTRIC CORPORATION i 11 Switchgear Division East PittSburgh Plant eel East Pittsbu gh a Jil Ji w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Страница 2: ...tion 4 Time current Characteristics 5 Adjustment of Calibration Settings 6 Maintenance Control Relay Shunt Trip Attachment Undervoltage Trip Attachment Undervoltage Time Delay Attachment Auxiliary Switch Alarm Switch Attachment Electric Lockout Attachment Key Lock Attachment Key Interlock Attachment Rectifier Unit for A C Undervoltage and A C Electric Lockout Attachments 7 11 11 12 12 12 12 15 15 ...

Страница 3: ... lOA lOB 11 12 13 14 15 16 17 18 19 Overcurrent Tripping Device with Long Delay and Short Delay Elements Schematic Diagram of Overcurrent Tripping Device with Instantaneous Element Only Typical Time Current Characteristics of overcurrent Tripping Device with Instantaneous Element Only Control Relay Construction Details Shunt Trip Attachment Construction Details Undervoltage Trip Attachment Constru...

Страница 4: ...I B 35 240 1 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Страница 5: ...mounted in an enclosure suitable to local operating conditions A selection of standard enclosures is available for various applications IMPORTANT To assure proper functioning inspect each breaker at regular intervals in accordance with a systematic maintenance schedule The frequency and character of the inspections will for the most part be determined by the severity of the duty performed The mini...

Страница 6: ...ns for proper operation should therefore be made with the breaker in this position Final inspection should preferably b e made with the breaker in its permanent mounting 6 2 Remove anyforeign particles from the hinge end of the moving contacts 3 Insert the maintenance operating handle and slowly close the breaker a Observe whether all parts are in proper alignment and move freely b Be sure that th...

Страница 7: ...s and 3 completing any secondary control w iring that may be necessary CAUT ION DUR ING INSTALLAT ION THE C IRCU IT BREAKER SHOULD BE IN THE OPEN POS IT ION Be sure to de energize the load and control leads to be connected and also the section of the switchboard where installation is being made Mounting dimensions and details of the front enclosure cutouts are shown in Figure 1 To prevent distorti...

Страница 8: ... BUILDER 1 J l I li 10 II I I riJ POSITION INDICATOR ADDITIONAL 4 POLE AUXILI ARY SWITCH 4 POLE AUXILIARY SWITCH Z4 DIA 6 MOUNTING HOLES f J 2 LIFTING BRACKET DOOR OR FRONT COVER SUPPLIED BY SWITCHBOARD BUILDER BOUNDARY SURFACES OF THE CIRCUIT BREAKER ARE TO BE CONSIDERED GROUND POTENTIAL PROVISION FOR PADLOCKING BREAKER L IN TRIPPED POSITION PADLOCKS FURNISHED BY CUSTOMER FIG 1 DB 75 OUTLINE AND ...

Страница 9: ... O OI 2J x coNTROL RE LAY 1 0 G 1 1 460 VAG 1 810317 o 03J cc cLOSING COIL I J FUSES TC TRIP COIL 125VDC X I T GONT V RATING cs coNTROL SWITCH 250VDC c I 2oe VAC R RED LAMP CLOSED 208VAC X l 230 VAG 4 0A 600V G GREEN LAMP OPEN g 4 TC 460 VAG U V UNDER V OLTAGE 125 VAG 30A 250V LO LOCKOUT l 1 250 VAG 15A 250V AS ALARM SWITCH o o MAKE CONTAC _r _yg _ bZ b BREAK CONT _ b __ CONTROL VOLTAGE SCHEMATIC ...

Страница 10: ...00 VOLTS A C CLOSING SOLENOID POLE UNIT MECHANISM CLOSED ARC CHUTE ALUMINUM PANEL TRIPPED OVERCURRENT TRIPPING DEVICE OPEN RESET FIG 3 CROSS SECTIONAL VIEW OF DB 75 CIRCUIT BREAKER 10 I B 35 240 1 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Страница 11: ...lowing order 1 Turn adjusting n uts A on insulating links to vary main contact pressure Use 005 feeler gauge 1 4 inch wide by 6 inches long inserted as shown in Figure 4A to check clearance Feeler X above contact fingers insures that they have all been deflected Feeler Y inserted below fingers insures that they have not gone solid 2 Check clearance between cam B and roller C located between insula...

Страница 12: ... up and then drive the pin to the right just far enough to clear the moving core rod Lower the moving core until it hits its stop Drive the pin to the left into its original posi tion 5 Remove the four mounting bolts a CAUTION THESE BOLTS ARE ALSO THE MOUNT ING BOLTS FOR THE CLOSING SOLENOID THEREFORE SUPPORT THE SOLENOID WHILE REMOVING THE BOLTS n Remove the Mechanism The mechanism is factory 1 u...

Страница 13: ... I I I I I I Jl_ I I I II I I 1 I I II 1 I I II I I I II I I I 1 II I 1 I II I I 1 I II I 11 I I II I I II II I I I I II II II I I II I r I I II I I I I I II I I I I II I 1 I II I I I l i I i i I l11 u l II II o II C I i l II II I I 0 l t til I II Jt I I I II I 0 z 0 n 0 n c l til 0 i l i l 0 w E l e c t r i c a l P a r t M a n u a l s c o ...

Страница 14: ...INSTA NTANEOUS PICK UP CAL IBRATION SPRING INSTANTANEOUS STAT IONARY MAGNE T t LONG DELAY STAT IONARY MAGNET t r I L L 7 v rT I t I L _ J l j h r _ __ __ LOW I r ER BREAKER STUDS I I j i L r J k _POLE UNI T BASE CJ 1 1 I i DIAPHRAGM AIR FILTER LONG DELAY VALVE AND DIAL FIG 6 CROSS SECTIONAL VIEW OF OVERCURRENT TRIP PING DEVICE WITH LONG DELAY AND INSTANTANEOUS ELEMENTS a z tzl z z tzl w E l e c t ...

Страница 15: ...ly equal when the main armature is closed Then tighten all four mounting bolts securely Adjustment of Trip Screw The trip screw mounted on the trip finger must be adjusted properly to obtain proper tripping CAUTION SINCE THIS ADJUSTMENT INVOLVES TRIPPING THE BREAKER CARE MUST BE TAKEN TO KEEP FINGERS AND FACE AWAY FROM ALL CONTACT ARMS AND OPERATING LINKAGE To proceed with the adjustment turn the ...

Страница 16: ...ANEOUS PICK UP CALIBRATION SPRING R BREAKER MOVING CONTACT ARM W SHAFT 11 LONG DELAY PICK UP ADJUSTMENT RESETTABLE DELAY f LONG DELAY TIME ADJUSTMENT GUIDE BEARING _j_ SOLID JOINT PINNED JOINT I 1 NO JOINT mJm_ STOP SURFACE Q ADJUSTABLE SCHEMATIC DIAGRAM 16 CURRENT MAGNITUDE TYPICAL TRIPPING CHARACTERISTICS FIGURE 7B FIGURE 7A FIG 7 SCHEMATIC AND TYPICAL TIME CURRENT CHARACTE RISTICS OF OVE RCURRE...

Страница 17: ...ER LONG DELAY ARMATURE T DELAY ARMATURE PART S WHICH DISCRIMINATE BETWEEN A BREAKER IN CLOSED POSITION B BREAKER OUR lNG PERIOD OF C LOSING L ARRANGED FOR LONG DELAY AND SHORT DE LAY TRIPPING ARRA NGED FOR LONG DELAY AND INSTA NTANEOUS TRIPPING o 0 t l t l o l t l t l 0 z a n a n c o l a t l t l a w E l e c t r i c a l P a r t M a n u a l s c o ...

Страница 18: ...OR T DEL A Y OVER TRAVEL SPRING LONG DELAY FORCE LIM ITING SPRING LONG DELAY PICK UP CALIBRATION SPRING SHORT DELAY PICK UP CALIBRATION SPRING _ __ j j __L WE BREAKER t I STUDS I ME J j I DISCRI PISTON MINATOR Tl I DELAY L_ _ f POL E UNIT BASE r 1 w N J DIAPHRAGM AIR FILTER SHORT DELAY VALVE __ LONG DELAY VALVE AND DIAL FIG 8 CROSS SECTION AL VIEW OF OVERCURRENT TRIP PING DEVICE WITH LONG DELAY AN...

Страница 19: ... A BREAKER MOVING CONTACT ARM S DISCRIMINATOR ROLLER T DISCRIMINATOR TIME DELAY PISTON U DISCRIMINATOR LEVER V DISCRIMINATOR LATCH W SHAFT I I t 1 LONG DELAY PICK UP ADJUSTMENT RESETTABLE DELAY I I I I I I I I I I I TOTAL CLEARING TIME f t LONG DELAY TIME ADJUSTMENT DELAY PICK UP ADJUSTMENT GUIDE BEARING _j_ SOLID JOINT PINNED JOINT NO JOINT 1 STOP SURFACE ADJUSTABLE SCHEMATIC DIAGRAM CURRENT MAGN...

Страница 20: ...ring C which is restrained by diaphragm D until sufficient air has entered valve P to permit the spring assembly C to lift crank J and trip the breaker by ro tating the trip finger K A discriminator arm is used on the selective overcurrent trip units to make the unit behave as an instantaneous type trip unit while the breaker is being closed and for a short inter val of time after closing This is ...

Страница 21: ...resents the minimum time for the breaker to clear when fault currents exceed ten times the trip unit rating S ELECTIVE OVERCURRENT TRIPPING DEVICE Refer to Figure 9B The time current characteristic of this trip unit is the same as the standard device except that the position of the flat portion of the curve can be shifted as indicated by the number 3 This adjustment can be made b y changing the se...

Страница 22: ... dl_____ l fF r ll 4 I u _ I RELAY TOGGLE _ Lt ARC j RELEASE CHAMBER RElAY TRIP J CLOSING SOlENOID BRACKET MOVING CORE A C OPERATING SOLENOID C8J l STATIONARY CONTACT D C OPERATING SOLENOID RELAY TRIP PIN BLOWOUT COIL FIG 1 1 CONTROL RELAY CONSTRUCTION DETAILS J z z z n E l e c t r i c a l P a r t M a n u a l s c ...

Страница 23: ...igure 12 mounts on top of the platform immediately to the right of I I I I I I I 0 I I I the operating mechanism It is non adjustable and is intended for intermittent duty only The shunt trip circuit must always be open by an auxiliary switch contact Inspecti on With the breaker in the open position m anually pull the shunt trip moving core against the stationary core and manually at tempt to clos...

Страница 24: ...rotates the pin pushes against the latch to release it from its latch plate When the latch releases the trip spring rotates the trip lever to trip the breaker The linkage is reset by the c ross bar as the breaker opens Always connect the coil to the line side o f the breaker unless the attachment is equipped with time delay device In this case the time delay will delay the tripping of the breaker ...

Страница 25: ...D C 2 1 75 115 v A C 75 15 450 v A C 25 5 Inspection Hold the U V trip lever down and close the breaker manually Release the trip lever slowly allowing the undervoltage trip spring to rotate the trip rod and trip the breaker after a time delay CAUTION DO NOT USE YOUR FINGERS TO HOLD AND RELEASE THE U V RESET LEVER Maintenance Check for loose bolts and faulty coils The switch is a shaft operated 4 ...

Страница 26: ...Note that the alarm contacts do make contact Maintenance Clean the alarm contacts when necessary Check for loose bolts 26 ELECTR IC LOCKOUT ATTACHMENT The electric lockout Figure 17 mounts on the top of the platform on the extreme left side and behind the auxiliary switches Its function is to hold the breaker open trip free until the lockout coil is energized The lockout coil can be de energized a...

Страница 27: ...35 240 1 TYPE DB 75 DE ION AIR CIRCUIT BREAKER I I r I C _ lli____ _ 1 w Q z 0 i u l et f z 0 u 1 z w z u I z u 1 V et J ci u 27 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Страница 28: ...MAINTENANCE rr I ll_ 28 H M1 T IT V J 1 w Cl z 1 L V l z 0 Ul 1 z w e c u 1 5 I u 0 l l C u e 1 u w l w _ ci LL B 35 240 1 I w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Страница 29: ... B 35 240 1 TYPE DB 75 DE ION AIR CIRCUIT BREAKER ln I I I I I J LRfl I I V J 1 w 0 z 0 1 u 0 I V z 0 u 1 z w 1 u 1 u 0 J 0 w 1 z w 0 0 u 0 J w u 29 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Страница 30: ...key interlock attachment the key cannot be removed unless the breaker is locked in the open position Inspection Push the trip button and turn key to the locked position The key is then removable and the breaker is locked in the trip free position Replace the key and rotate to the 30 RECTIFIER UNIT FOR A C UNOERVOLTAGE AND A C ELECTRIC LOCKOUT ATTACHMENTS When an a c undervoltage attachment or an a...

Страница 31: ..._ _ iEf4 i I II II u TERMINAL BLOCK RECTIFIER TO UV AND OR LO TRANSFORMER TO AC VOLTAGE SOURCE SCHEMATIC FIG 19 FIG 19 RECTIFIER UNIT FOR A C UNDERVOLT AG E AND ELECTRICAL L OCKOUT ATT ACHMENTS _ _ _ ________ _ ____ ___ _ ___ o o i CC l l t 1 til t 1 l l 0 z a a c o i til a l l l l a E l e c t r i c a l P a r t M a n u a l s c ...

Страница 32: ...t l J f f w m _ r W Cfttz 7 jHS R u w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

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