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Type 50-D H-50 Air Circuit Breaker
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�stinghouse
600-1200 Amperes,
5000 Volts
Operation
INSTRUCTION BOOK
Safety for Personnel
Storage
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Handling, Unloading, Unpacking
Westinghouse Electric Corporation
Installation
Maintenance
CAUTIONS
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East Pittsburgh, Pa.
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Page 6
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7
"
7
I. B. 32-130-lB
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Summary of Contents for Westinghouse 50-DG-50
- Page 1 600-1200 Amperes, 5000 Volts Installation Operation Maintenance INSTRUCTION BOOK CAUTIONS Page 6 Safety for Personnel • " Storage • • • • • • • " Handling, Unloading, Unpacking Westinghouse Electric Corporation East Pittsburgh, Pa. I. B. 32-130-lB - ·...
- Page 2 - - - "\\e s tinghouse �· • Type 50-D H-50 Air Circuit Breaker 600-1200 Amperes, 5000 Volts ever, its operation is, to a considerable degree, simi PURPOSE lar to that of an oil circuit breaker. It is built by a The purpose of this instruction book i�...
- Page 3 Type 50-DH-50 Air Circuit Breaker The 50-DH-50 Air Circuit Breakers are designed all low voltage control accessories are located • for indoor operating service at a-c voltages of from below the high voltage parts and isolated from them 2200 to 5000, for normal current loads up to and by a horizontal steel barrier to which a vertical including 1200 amperes and for an interrupting plate is attached.
- Page 4 50-DH-50 Air Circuit Breaker Type • Contact Assembly 600 A MPERE 1200AMPERE The breaker contact assembly, Figure 5, is lo cated above the operating mechanism and operated by an operating rod, shaft and pull rods. This contact assembly must be capable of carrying normal load currents and drawing the arc during the interrupting periods in a manner that after circuit interruptions the contacts will be in such...
- Page 5 Type 50-DH-50 Air Circuit Breaker to the lower breaker terminal, thus relieving the Arcin� Chambers and Ma�netic Circuit • contacts of the current carrying duty until the arc The arcing chambers are locat7d immediat�ly is extinguished in slot of the arc chamber, 5, 6. above the arcing contacts and constst of assembhes of laterally spaced ceramic plates, having V-shaped slots and held together with a moisture and heat...
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Page 6: Operation And Maintenance
Transportation Company arcing contact surfaces. and the nearest Westinghouse Sales Office notified As the breakers are more easily handled with promptly. the arc chambers removed it is advisable not to Unloading and uncrating the breaker requires mount the arc chambers and barriers on the break... - Page 7 Type 50-DH-50 Air Circuit Breaker cotter pins, locking clips, etc. are in place. Note Maintenance • evidences of excessive wear or other improper oper The frequency of inspection, cleaning, etc. will depend upon the activity and duty to which the ation of the various parts.
- Page 9 Type 50-DH-50 Air Circuit Breaker Contacts is secured by energizing the closing coil. A magnetic • flux generated by the closing coil forces the moving The contacts should be inspected periodically core and attached push rod upwards against the for wear and for evidence of undue burning. Under push rod roller (located at the junction of the normal conditions the contacts should be usable for breaker lever links and the mechanism links.) By...
- Page 10 Type 50-DH-50 Air Circuit Breaker • --r-· : r .. · � =:Or- - F "--� • '• � ' • '• � -1-- ---r--- ----L-'----- --- ---- ..tr,, , __ .. __ , Fig. 8-Four Coil Attachment rod which is pushed up against the tripping lever. The calibration is varied by changing the air gap between the moving and stationary cores by raising or lowering the calibration screw.
- Page 11 50-D H-50 Brea b"' TvPe Air Circuit Undervolta�e Release • The undervoltag � release, Figure 11, mounts on the left hand s1de of the mechanism frame -Std. with the two mounting screws as shown. The Temp. Oil --- Spcl. Low undervoltage reset extension of the breaker lever /.
- Page 12 Type 50-DH-50 Air Circuit Breaker of1'1un. Fig. 12-Cutoff Switch, Early Model BRACKET Fig. 13-Cutoff Switch, Late Model in turn rotates the switch lever to compress the The cut-off switch supplied on the later models auxiliary compression spring and permit the switch is mounted on the right side of the mechanism to make contact.
- Page 13 Type 50-DH-50 Air Circuit Breaker of the closing stroke the mechanism push rod the tripping lever and makes contact when the roller pin strikes that switch lever causing it to tripping lever is in the normal position and breaks rotate and permit the switch to make contact contact when the tripping lever is raised.
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Page 14: Supplementary Information
The material used Note: De-ionized or demineralized water can be on Westinghouse breakers is Micarta, which has obtained in small quantities from many firms that a long established record for insulating and me maintain chemical laboratories, particularly storage chanical dependability.