Westinghouse DB-50 Instructions Manual
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Summary of Contents for Westinghouse DB-50
- Page 1 Instructions for • Types DB-50, DBF-16 and DBL�50 Air Circuit Breakers • West�nghouse Electric CorporathJn Switchgear Division, East Pittsburgh, Pa. I.B. 33-850-30, Effective May, 1970. Supersedes 33-850-3-C, March, 1966.
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Page 2: Table Of Contents
Page Table of Contents P age Part Receiving, Hand ling, and Storing • Inspection Storing Part Installation • Connections . Part Maintenance • • Pole Unit • Contacts • Maintenance of Contacts Operating Mechanism . (Closing Spring Mechanism) Spring Closing Assembly . •... - Page 3 Page 3 List o f Illus trat i o ns Figure Page Type D B - 5 0 Fixed Circuit Breaker Outline Dimensions • • • • • • and Mounting Details Type DB- 50 Three Position Drawout Outline Dimensions Typical Wiring Diagrams - Type DB- 50 Fixed Circuit Breaker .
- Page 4 • nance schedule. Consult Westinghouse engineer Type "DB" air c ircuit breaker is de signed ing and service personnel for recommendations to give continuous and reliable service as pertaining to special operating or maintenance conditions.
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Page 5: Inspection
To a void damage to the breakers, do not use hooks in handling. Be sure that the contacts are clean and properly aligned. For a description of Net weights of Type DB-50 are given in contact alignment, refer to "Contacts", T able No. -
Page 6: Part Installation
Page PART 2 INSTALLATION � C ONN E C TION� Type " DB-5 0" circuit breakers are fur nished as complete unit ass emblies and the installation consists of: ( 1 ) bolting them to Typ i c al circuit breaker wnmg diagrams the supporting framework or structure;... - Page 8 BKR IN TRIPPED POSITION. PAD LOCK FURNISH ED BY CUSTOM CONTROL RELAY· AS CELL INTERLOCK REVERSE OVERCUR R ENT TRIPS BEFOKE THIS CURR ENT TRIP DIM. IS EXCEEDED TRIP POLE I� POLE Fig. Type DB-50 Three Position Drawout Outline Dimensions...
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Page 9: Part Maintenance
Contacts . (See Fig. 3 . ) Fig. 3A . Rotating the closing handle clockwise DB-50 arcing c ontact should touch first on rais es the lift link and lower spring guide closing, open last on opening. Contact pressure on to compress the closing spring. -
Page 12: Overcurrent Tripping Device 1
Push p i n ( 6 ) t o right into hole coils , is similar for all ratings . MECHANISM HAND!,._E LATCH PUSH LINK- PLATE UPPER SPRING GUIDE SPRING MECHANISM DB-50 CIRCUIT BREAKER 1600 AMPERES, 600 VOLTS A-C Fig. 3A - Type DB -50 Spring Closing Assembly... - Page 13 TEST POSITION MARK SCUTCHEON · VIEW: FACE-f'LATE, HANDL£, PANTOGRAPH LINKS NOT SHOWN "' Fig. 3B Type DB-50 Three Position Operating Mechanism...
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Page 14: Installation And Removal
Page Fig. Series Overcur Fig. 5 Series Overcurrent rent Tripping Device with Tripping Device Showing the Long Time and Instan Assembly of Calibration Case taneous Element to Magnetic Circuit. peres. The construction, except for the longer than specified above are not used, coils, is similar for all ratings. -
Page 15: Construction
Pa ge Fig. Cross-Sectional View of Ser.ies Overcurrent Tripping Device with Long Delay and Instantaneous Elements The tripping device cons ists of two main can readily be moved upward to check the subassemblies namely: tripping action. The trip plunger extends out the top of the tripping device and has a The magnetic frame and coil assembly neck and head under which a forked tool can... -
Page 17: Trippin G Characteristic S Of Standard Series Overcurrent Tripping Device With Long Delay And Instantaneous
Page 1 7 ooo o g �gg o 0 0 0 000 0 0 0 0 • I - 1- ggg�� oooo oooo .OL5 0 0 0 7 8 9 10 0 0 0 � fil current in percent breaker trip unit rating Fig. - Page 18 Page current in percent of breoker trip unit ratin g 0 0 o 0 0 0 oo g g g o o o o o oooo 0 8 g 8 8 g gggg 8 0 8 8888 g calibrated marks of 80,100,120,140, ond 160 percent of trip unit rating total clearing time .LCD_ 1 100°/0 pickup and 3 0 second long deloy settings...
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Page 19: Tripping Characteristics Of Special Series Overcurrent
Page 19 2 oo · ·•. : '· I •-: !-- :�: ., •:_ • I' : " �;;, • '-''''" . 03 .1 . 8.9 I Fig. Tripping Characteristics of Special Series Overcurrent Tripping Device with Instantaneous Element Only... - Page 20 P" g - ·-;:4}:;-- Fig. 1 0 Schematic Diagram of Standard Overcurrent Tripping Device with Adjustable Long Delay and Adjustable Instantaneous Element chamber T by the various valves H and K. long delay will begin to operate is deter When the diaphragm has reached approx mined by the long delay pick-up adjusting imately 6 0 percent of its travel , a quick knob P, F igure 1 0 .
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Page 21: Time-Current Characteristics 2
P a g e 2 1 A quick rele ase valve (shown in Fig. 6 - The tripping time will remain constant until short delay tripping p arts) which functions interrupted by the instantaneous short as des cribed for dual overcurrent tripping delay pick-up whereve r they occur. -
Page 22: Delay Elements
Page --�- - Fig. 1 1 Schematic Diagram of Selective Series Overcurrent Tripping Device with Adjustable Long Delay and Short Delay Elements --�·- Fig. 12 Schematic Diagram of Special Series Overcurrent Tripping Device with Instantaneous Element Only... -
Page 23: Discriminator For Tripping Device
Page 2 3 B!O!. MOV. CONT. BK!<· Ct.. O SEO 'BKI/I.MOV. CONT. AK1'7- 8KR· OPEN IJIIsN Fbr PIST Ol( L - --- f�ONT VtEW ]) 150?./MI/Y4 To,e. T Y PE DB- S o lktP F oR 0 V E I{Cl/�ii!E ,¥r Fig. -
Page 24: Control Relay
P a g e 2 4 F R O NT Fig. Closing Solenoid - Construction Details setting before shipment. A different setting CONTROL REL AY c an be obtained by c arefully turning the adjusting knob with the help of a small The control relay (see F ig. -
Page 25: Control Relay - Adjustment And Construction Details
P a g e [j}-TRIP ON REL/\ Y COVER �SOLENOID M i\GN ET FRI\ME. �P R I N G � ---- l L LVER RELAY RELEASE CLOSING SOLENOI D MOV I NG CORE R E L A Y M O L D S T O P S U R F A C E R E L E A S E... -
Page 26: Shunt Trip Attachment
P a g e 2 6 E ne rgize relay operating coil . Slowly SHUNT TRIP ATTACHM E N T close the breaker manually. The relay release arm should operate the relay trip The shunt trip mounts o n top of the platform assembly and the relay... -
Page 27: Undervoltage Trip Attachment
Pa g e trip, replacing moving core cover. ( See Fig. 1 7 . ) Maintenance The needle valve screw in the top regulates the opening through which the air is forced and hence Check for loose bolts and faulty coil. the time delay . - Page 29 P a g e 2 9 � � , - -=- - 1 1 18 - Undervoltage Time Delay Attachment - Construction Details Fig. T R I P C R A N K C O I L A S S E M B LY-��i- F R O N T Y O K E---r'"-"1- C A L I B R A T I O N S P R I N G...
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Page 30: Auxiliary Switch . 3
Page and change the contacts as des ired. Be sure gap setting can be reduced to zero or set to replace the shaft in the original position to open after the breaker contacts close , if relative to one of the unchanged contacts . desired. - Page 31 P a g e ADJUST O P E RATING ROO TO S E C U R E 1 / 1 6 TO 3/1 6 B R E A K O F F I E L D D I SCHARG E CONTACT WHEN B R EAK E R A R C I N G CONTACTS TOUCH ON CLOSI N G BREAKER...
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Page 32: Key Interlock Attachment . 3
F a g �lf\RM SW ITCH CROSS B�R Fig. 22 Alarm Switch Attachment - Construction Details M aintenance Inspection The device is non-adjustable . Check for Rotate the breaker handle to the closed po loose bolts only. sition. The lockout should prevent closure of the breaker by holding the trip bar in the trip free position. -
Page 33: Electric Lockout Attachment - Construction Details
h i l I I . '�: i l l I 1E�ri"t� tb�7 -��PP���t)PU���SET��sl�. Fig. Electric Lockout Attachment - Construction Details "' ""' ""'... - Page 36 F ig. Type "DBL" A ir Circuit Breaker DBL-50 BREAKE R DB-50 breaker with special current limit ing trigger fuses mounted on the top studs The DB L- 5 0 breaker consists of a standard (Ref. Fig. 2 6 ) .
- Page 38 P a g e 38 Memorandum...
- Page 39 t' a g e 3 9 Memorandum...
- Page 40 Printed in U.S.A.