Westinghouse DE-ION DB-75 Instructions Manual
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Westinghouse DE-ION DB-75 Instructions Manual

Westinghouse DE-ION DB-75 Instructions Manual

Air circuit breaker
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, • '
I
INSTRUCTIONS
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..
TYPE DB-75 "DE-ION''
Am CIRCUIT BREAKER
. .,
'
3000 AMPERE
FRAME SIZE
... . '
I
600 Volts 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
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WESTINGHOUSE ELECTRIC CORPORATION
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.
···- �
East Pittsbu�gh;·
Switchgear Division - East PittS b urgh,
- '
<: !� � ��- ;
.eel:

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Summary of Contents for Westinghouse DE-ION DB-75

  • Page 1 75, 000 Amperes - 600 Volts A-C 100, 000 Amperes - 250 Volts A-C November, 1956 I.B. 35-240-1 �;'·' :::;� ('\." ' WESTINGHOUSE ELECTRIC CORPORATION �: . ···- � East Pittsbu�gh;· Switchgear Division - East PittS b urgh, <: !� � ��- ; .eel:...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS Description Page PART - RECEIVING, HANDLING, AND STORING Inspection Storing . . PART I I - INSTALLATION Connect ions ..PART II I -MAINTENANCE Pole Unit ..Contacts .
  • Page 3 LIST OF ILLUSTRATIONS Figure Page DB-7 5 Outline and Mounting Dimensions Typical Wiring Diagrams ..Cross-Sectional View of Type DB- 75 Circuit Breaker Adjusting Limits of Main and Arcing contacts for D B - 75 Circuit Breakers .
  • Page 4 I. B. 35-240-1...
  • Page 5 � as well as on coordination and freedom of all moving parts, must be in­ cluded in t he maintenance schedule. Consult Westinghouse Engineering and Service Personnel for recommendations pertaining to special operat­ ing or maintenance conditions. I. B. 35-240-1...

  • Page 6: Inspection

    If the contacts are in a lignment and all Westinghouse Sales Offi�e. parts move freely, continue the closing until the breaker is latched.

  • Page 7: Storing

    TYPE DB-75 DE-ION AIR CIRCUIT BREAKER y ears of service. The l ubric ant is of a should be carefully inspected for loose or special form which is used sparingly. damaged parts and then stored in a clean, dry addition of oil will only promote the accu­ place in an upright position to avoid damage to the circuit breaker parts.

  • Page 10: Pole Unit

    MAIN TEN ANCE ARC CHUTE ALUMINUM PANEL DB-75 CIRCUIT BREAKER AMPERES VOLTS 3000 POLE UNIT MECHANISM OVERCURRENT CLOSING SOLENOID TRIPPING DEVICE OPEN (RESET) CLOSED TRIPPED FIG. 3- CROSS-SE CTIONAL V IEW OF DB-75 CIRCUIT BREAKER 35-240-1 I. B.
  • Page 12 • MAIN TEN AN CE MAINTENANCE O F CONTACTS Remove the Mechanism. Rough or high spots should be removed with The mechanism is factory ubricated for a file or emery-cloth. When dressing contacts life. be sure to protect the hinged contact of all poles with a cloth to prevent foreign matter CLOSING SOLENOID from lodging in the hinged contact.

  • Page 13: Closing Solenoid - Construction Details

    � ..MOVING CORE � , l CO I L l 1 1 ""l o< "C i:'=l II• "I - -- l � r �: I II ..., " II I -:-� � 1,., I I, "I 1 : : I II ..
  • Page 14 BREAKER MOVING CONTAC T ARM > ..; INSTANTA N E OUS MOVING MAGNET---- --..> INSTANTANEOUS STAT IONARY MAGNE T :·--� � - ...-4._ BREAKER T RIP F INGER ( L. � LONG DELAY MOVING MAGNET ------7. TRIP CRANK •...

  • Page 15: Construction

    TYPE DB-75 DE-ION AIR CIRCUIT BREAKER The overcurrent tripping device can be re­ Adjustment of Trip Screw m oved from the breaker easily and replaced w ith another unit of the same or different The trip screw mounted on the trip finger r ating without affecting the calibration of must be adjusted properly to obtain proper the units involved.

  • Page 16: Overcurrent Tripping Device With Long Delay And Instantaneous Elements

    MAIN TEN A N CE •· LEGEND• A-LONG DELAY STATIONARY MAGNET J-TRIP CRANK GUIDE BEARING B-LONG DELAY MOVING MAGNET K-BREAKER TRIP FINGER C-LONG DEL A Y FORCE LIMITING SPRING L- INSTANTANEOUS STATION A R Y MAGNET SOLID JOINT D-DIAPHRAGM M-INSTANTANEOUS MOVING MAGNET E-AIR CHAMBER Q-INSTANTANEOUS PICK-UP CALIBRATION SPRING...
  • Page 17 � >1>- ..ROLLER AR M HELD I N AIR PISTON DISCRIMINATOR LATCH P OSIT ION A SSOCIAT ED R OLLER LEVER WITH OPEN BR E AKER LONG DELAY ARMATURE T DELAY ARMATURE ..., o< "0 • ..., "' •...

  • Page 18: Cross-Sectional View Of Overcurrent Tripping Device With Long Delay And Short Delay E Lements

    > BREAKER MOVING CONTACT ARM ..>-l SHORT DELAY MOVING MAGNET----, > SHORT DELAY STATIONARY MAGNE T DISCRIMINATOR ROLLER---- -..DISCR IM INATOR L EVER---- -. ._ �--� � - LONG DELAY S TAT I ONARY MAGNET �...

  • Page 20: Instantaneous Element Only

    MAINTENANCE On larger overload currents, the action is the short delay pick-up setting. If the cur­ essentially the same as above except that the rent does not rise above this value, then the moving armature (B) will close completely as breaker remains closed and the discriminator soon as the overload is applied.

  • Page 21: Time Current Characteristics

    TYPE DB-75 DE-ION AIR CIRCUIT BREAKER PICK-UP The instantaneous pick-up adjustment can ADJUSTMENT shift the vertical part of the curve to the l eft or right as indicated by number (2). This is achieved by changing the spring force applied to the smaller instantaneous armature. The flat portion of the curve at the bottom represents the minimum time for the breaker to clear when fault currents exceed ten times...
  • Page 22 > � � � > A. C. OPERATING SOLENOID � CLOSING D.C. SOLENOID FRAME OPERATING e� MOVING CONTACT _____ u.._ <-) TRIP RELAY BLOWOUT COIL RELAY TRIP RELAY TOGGLE STATIONARY CHAMBER RELEASE CONTACT ---= RElAY TRIP CLOSING SOlENOID BRACKET MOVING CORE FIG.

  • Page 24: Shunt Trip Attachment

    MAIN TENANCE t he reset lever rotates, the pin pushes UNDERVOLTAGE TRIP ATTACHMENT a gainst the latch to release it from its The undervoltage trip (Figure 13) mounts latch plate. When the latch releases, on top of the platform, to the right of the trip s pring rotates the trip lever to trip t he breaker.
  • Page 27 TYPE DB•75 DE·ION CIRCUIT BREAKER � -< :::l :r- - - � � � I­ -< � � -< -< lli_ C::: :: :: � ___ _ 35-240-1...
  • Page 28 MAINTENANCE rr - - - � • <( 1-­ £� 1-· � ..� :::c � ::-=: <C e::: ..ll_ � '--- -- -- -- - I. . 35-240-1...
  • Page 29 TYPE DB-75 DE•ION AIR CIRCUIT BREAKER ...J :;:::) 0::: I­ � � ::1: < � ...J 0::: >­ � 0::: � ...J >­ � I. B. 35-240-1...

  • Page 30: Key Interlock Attachment

    MAIN TENANCE unlocked position to free the breaker trip The key can be removed in the open or closed The key i s not removable in this position of the breaker. button. pos it ion. Inspection Maintenance Push the trip button and turn key to the locked position.

  • Page 31: Lockout Attachments

    !""" (J.) ""' t--.:1 ..TRANSFORMER ' I I RECTIFIER w r - - ::.-- 1 1 J) l ---=-�:::' , _ __ RECTI ::_ AC. VOLTAGE AND/OR SOURCE >< "'CC l:"l t::1 SCHEMATIC .."' t::1 • l:"l >...
  • Page 32 t:•' "" ' ;;l :-?::�; � ��' J '" :f�;<�';' f ,'<w�---...

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