Westinghouse DH-P Series, Instructions Manual

Page 1: ...l Clad Switchgear Type DH P Circuit Breakers orcer ine Westinghouse Electric Corporation Assembled Switchgear Devices East Pittsburgh Pa I B 32 253 1 Effective May 1964 Cast Mechanism Style Courtesy of NationalSwitchgear com ...

Page 2: ...rge Closing Spring by Hand To Spring Close Breaker without Electric Power To Open Breaker by Hand To Close Breaker by Hand with Maintenance Closing Handle To Open Breaker Contacts Slowly How the Breaker Works Operating Mechanism Stored Energy Type Anti Close Interlock Operating Mechanism D C Solenoid Type Chassis Levering Device and Breaker Interlock Floor Interlock and Operating Levers Automatic ...

Page 3: ...s Stored Energy Mechanism Removing and Installing Spring Charge Motor Removal of Closing Spring Parts Identification Renewal Parts Chassis Parts Stored Energy Mechanism All Ratings Solenoid Mechanism Rating Table and Weights 46 47 48 48 49 50 50 51 51 51 51 51 52 52 52 52 52 53 53 53 54 55 55 55 56 List of Illustrations Page Figure General Arrangement of Type 50 DH P75 Circuit Breaker Installing A...

Page 4: ...ree c Open and Reset Ready to Close 4 16 KV Breaker Chassis with Stored Energy Mechanism 4 16 KV Breaker Chassis with Solenoid Mechanism Schematic Drawings of Levering Device a Breaker in Withdrawn or Test Position b Breaker in Fully Engaged or Energized Position Rear View of 4 16 KV Breaker Pole Units and Details for 1200 and 2000 Ampere 4 16 KV Breakers Pole Units and Details for 1200 and 2000 A...

Page 5: ... Movements Parts for Stored Energy Mechanisms Stored Energy Mechanism Parts for Crank Shaft Subassembly Stored Energy Mechanism Parts for Close and Trip Subassemblies Parts for Solenoid Mechanism Solenoid Mechanism 21 36 22 37 38 23 39 24 40 25 41 26 42 Courtesy of NationalSwitchgear com ...

Page 6: ...available ratings are shown in the Rating Table on page 56 These instructions are written so as to be easy to read In order to avoid trouble in handling operation etc PLEASE READ THE INSTRUCTIONS BEFORE ATTEMPTING ANY OF THESE OPER ATIONS If the need to get into operation is especially urgent the sec tions RECEIVING HANDLING STORING and BASIC OPER ATING INSTRUCTIONS can be read first and the remai...

Page 7: ... free The mechanism is located in the chassis at the bottom of the breaker The porcelain pole unit supports are mounted on the top of the chassis and there is no grounded metal higher than the base of the pole unit The arc chutes are hinged to the top of the pole unit directly over the circuit breaker contacts The barrier assembly provides gas isolation between pole units and to the cell wall wher...

Page 8: ... R E F U L L Y A N D L O O K AT BREAKER BEFORE TRYING TO OPER ATE 1 To Lift Breaker CAUTION Do not lift breaker with arc chutes in place you might damage them BE SURE TO CONNECT SHUNT STRAP FROM LOWER CONTACT TO FRONT ARC CHUTE CONNECTION NECTION IS TIGHT AT BOTH ENDS OF SHUNT TO LEAVE CONNECTION LOOSE WILL CAUSE DANGEROUS FIREWORKS Place crane hooks in holes in chassis m a r k e d Lift Here Be su...

Page 9: ...do this may cause serious damage or injury 1 6 To Place Breaker in First Position in Cell This is called the TEST POSITION Mechanical interlock prevents levering break er in or out if breaker is in closed position If such an attempt is made with enough force 3 16 pin at front of levering shaft is designed to shear as a safety measure to prevent dam age to parts harder to get to a Press down on rai...

Page 10: ...ately after each closing operation a Press down on rail latch to free breaker from rail 3 Breaker is closed electrically by ap plying voltage to the spring release coil marked Lift to Close through the con trol switch b Pull breaker out of cell NOTE On stored energy mechanisms the breaker may close and open as it is withdrawn depending on whether breaker was leftclosed or open or whether spring wa...

Page 11: ...e test position in the cell a flag covers the main tenance closing socket to prevent insertion of the handle Don t force flag out of position and insert handle HOW THE BREAKER WORKS Operating Mechanism Stored Energy Type The spring stored energy mechanism does two jobs CAUTION Always remove maintenance handle before opening the breaker by the tripping trig ger Handle is not trip free in this mode ...

Page 12: ...ing cam has rotated about one half turn The cam for this portion of the travel is cylindrical and causes no further movement of the closing cam fol lower roller This rotation corresponds to the s p r i n g charging rotation of the ratchet wheel shown in Figs 7a and 7b Figures 7a and 7b are schematic views of a section of the mechanism as would be seen from the R H side of the breaker with the brea...

Page 13: ...HANISM D C SOLENOID TYPE Figure 9a is a photograph of the bottom of a 4 16 KV breaker with a d c solenoid mechanism Figure 9b shows the same view of al3 8 KV solenoid operated breaker With the exception of being especially com pact these mechanisms are of conventional design They consist essentially of d c magnets and mechanically trip free link ages meaning that the breaker contacts are always tr...

Page 14: ...eaker pushing the levering shaft with it Conse quently the levering shaft stands still rela tive to the screw and other cell parts in cluding the door Thus the end of the lever ing shaft is always the same distance be hind the door whether the breaker is in the test or energized position or in between If you try to turn the levering in shaft as hard as possible while the breaker is closed the leve...

Page 15: ... 1 5 t i Figs la lb Views Showing General Arrangement of Type 50 DH P75 Circuit Breaker k Courtesy of NationalSwitchgear com ...

Page 16: ...1 6 Fig 2a Installing Arc Chute of Type 50 DH P75 Breaker Courtesy of NationalSwitchgear com ...

Page 17: ...1 7 Fig 2b Installing Arc Chute of Type 150 DH P500 Breaker Courtesy of NationalSwitchgear com ...

Page 18: ... 18 w Fig 2c y4rc Chute of Type 50 DH P250 in Place on Breaker Courtesy of NationalSwitchgear com ...

Page 19: ...1 9 Fig 5a Charging Closing Spring by Hand 4 15 KV Breaker Figs 4a 4b Operation of Secondary Contacts with Breaker in Test Position Courtesy of NationalSwitchgear com ...

Page 20: ...2 0 4 Fig 5b Spring Closing Breaker by Hand Release 4 16 KV Breaker Courtesy of NationalSwitchgear com ...

Page 21: ...21 Fig 6 Bottom View of Stored Energy Mechanism in 4 16 KV Breaker Courtesy of NationalSwitchgear com ...

Page 22: ...Interlock Breaker in Closed Positi on 5 Ratchet Roller Ratchet Wheel Center of Crank Shaft Mechanism Frame Closing Spring Connecting Rod Holding Pawl Driving Pawl 010 to 060 Breaker Closed Spring Release Trigger 13 6 7 14 8 9 10 12 t Shf i O I I J 3 o v ft Figs 7a 7b Schematic Views of Stored Energy Mechanism Spring Charging Parts Courtesy of NationalSwitchgear com ...

Page 23: ... I I v I 0 I 1 I o v i t f y J J J fcj d Figs 8a b c d The Four Positions of the Closing Cam and Tripping Linkage a Breaker Open and Spring not Charged b Breaker Open and Spring Charged c Breaker Closed and Spring not Charged d Breaker Closed and Spring Charged Courtesy of NationalSwitchgear com ...

Page 24: ...2 4 Fig 9a Bottom View of a 4 16 KV Breaker with Solenoid Mechanism Fig 9b Bottom View of a 13 8 KV Breaker with Solenoid Mechanism Courtesy of NationalSwitchgear com ...

Page 25: ...2 In to I 16 In yo 2 f o c i 0 Q J I I V Fi s 10a b tc Sc jemafic Drawings shouting Positions o Solenoid Mechanism Linkage a Closed and Latched 7 Tripped Free c Open and Pesef Ready to Close Courtesy of NationalSwitchgear com ...

Page 26: ...Motor Limit Switch LS I Aux i 1 iary Switch Upper a b Contacts Aux i 1 iary Switch Lower an b Contacts Puffer Casting Shutter Operating Rol 1er Lift Here 12 LC 7 Control Relay Y Spring Release Magnet and Coil SR Tripping Magnet TC Coil Secondary Contact Hand Operating Rod Secondary Contact Levering Handle 13 2 W 8 15 3 4 9 16 10 5 i 17 Fig 11a 4 16 KV Breaker Chassis with Stored Energy Mechanism C...

Page 27: ...27 Fig lib 4 16 KV Breaker Chassis with Stored Energy Mechanism Fig 12 4 16 KV Breaker Chassis with Solenoid Mechanism i Courtesy of NationalSwitchgear com ...

Page 28: ...CREW LEVERING SHAFT BREAKER INTERLOCK KEY SPRING Fig 13a f k 30 IE go T L L 3 Fig 13b Figs 13a b Schematic Drawings of Levering Device a Breaker in withdrawn or Test Position b Breaker in Fully Engaged or Energized Position f NationalSwitchgear com ...

Page 29: ...n 2 9 ill Courtesy of NationalSwitchgear com ...

Page 30: ...Contact Mounting Bolt Lockwashers 24 Movable Arcing Contact Mounting Bolt Nuts 25 Movable Main Contact Blade L H 1200 Amp 26 Movable Main Contact Blade R H 1200 Amp 27 Kick Out Spring Retainer Lockwasher 28 Kick Out Spring Retainer 29 Kick Out Spring 36 Movable Contact Lift Rod Pin 31 Movable Contact Hinge Pin 32 Movable Contact Hinge Pin Nuts 33 Arc Chute Shunt Strap 34 Arc Chute Operating Positi...

Page 31: ...31 Fig 16 Pole Units and Details for 1200 and 2000 Ampere 13 8 KV Breakers Courtesy of NationalSwitchgear com ...

Page 32: ...32 i 4 Fig 17 Schematic Drawing of Center Coil Type of Arc Chute as used on the DH P Line of Breakers Courtesy of NationalSwitchgear com ...

Page 33: ...3 3 Fig 18 Partially Assembled View and Details of 50 DH P250 Arc Chute Courtesy of NationalSwitchgear com ...

Page 34: ...3 4 Fig 19 Arc Chute Details of 50 DH P75 Breaker Courtesy of NationalSwitchgear com ...

Page 35: ...35 Fig 20 Lifting the Arc Chute of 13 8 KV Breaker with Arc Chute Lifter Courtesy of NationalSwitchgear com ...

Page 36: ...36 f t Fig 21 Drawing of Contacts showing Settings and Movements Courtesy of NationalSwitchgear com ...

Page 37: ...me f o r 4 1 6 1 3 8 KV 7a C l o s i n g S p r i n g 13 8 KV 8 C l o s i n g S p r i n g 13 8 KV 9 C l o s i n g S p r i n g Retainer 9a C l o s i n g S p r i n g Retainer P i n 1 0 H o l d i n g Pawl Pivot P i n 11 M o t o r S h a f t A d a p t e r 12 D r i v i n g Pawl Eccentric 13 H o l d i n g Paw 1 14 D r i v i n g Pawl S p r i n g 15 D r i v i n g Paw 1 16 D r i v i n g Pawl Washer 17 H o l ...

Page 38: ...pring Release Latch Stop 28 Bearing Cap R H Retainer Bolts 29 Automatic Floor Closing Spring Release Lever See Fig 6 30 Floor Interlock Automatic Tripping Lever See Fig 6 31 Pin for Items 29 30 32 Floor Lever Spring Release Operating Rod See Fig 6 33 Floor Lever Trip Operating Rod See Fig 6 34 Springs for Items 29 30 35 Pin for Items 29 30 36 Crank Shaft Sub Assembly See Fig 23 37 Pole Unit Operat...

Page 39: ...3 9 Fig 23 Stored Energy Mechanism Parts for Crank Shaft Sub Assembly Courtesy of NationalSwitchgear com ...

Page 40: ...Pin for Item 22 24 Washer for Item 22 25 Nut for Item 22 Tripping Latch Sub Assembly Tripping Latch Main Lever Tripping Latch Front Roller Tripping Latch Rear Roller Tripping Latch Front Roller Pin Tripping Latch Rear Roller Pin Tripping Latch Rear Roller Washer Tripping Latch Rear Roller Nut Self Lock ing Tripping Latch Front Roller Nut Self Lock i ng 10 Closing Cam Follower and Tripping Cam Sub ...

Page 41: ...r End Plate Bolt Lock Washers 8 Magnetic Tie Rod Front Bolt Lock Washers 9 Magnetic Tie Rod Front Bolts 10 Stationary Core Bolt Lock Washers 11 Movable Core Retrieving Springs 12 Pole Unit Operating Lever L H 13 Pole Unit Operating Lever Center 14 Pole Unit Operating Lever R H 15 Bolt for Item 23 16 Spacer for Item 32 17 Spacer for Item 32 I9 Spacer for I tern 32 20 Spacer for Item 32 21 Washer fo...

Page 42: ...Guide Link 14 Restraining Link and Tripping Cam Pin 15 Retainers for Item 14 16 Tripping Cam Movable Core Pin Upper Closing Link Restraining Link and Tripping Cam Pin Retainers for Item 3 E Rings Movable Core Movable Core Links Lower Closing Link Restraining Links Spacer for Item 8 I 2 3 4 5 6 7 8 9 Fig 26 Solenoid Mechanism 4 16 KV Courtesy of NationalSwitchgear com ...

Page 43: ... RELEASE For further operating details see BASIC OPERATING INSTRUCTIONS On breakers with stored energy mech anisms the floor interlock and automatic tripping lever also acts to lift the tripping trigger as the breaker is withdrawn from the cell from the test position This to gether with the automatic floor closing spring release acts todischarge the closing spring and open the breaker as it comes ...

Page 44: ...he crank shaft A few downward strokes charge the spring When charging is complete the crank pin snaps over center with an audible click DO NOT ATTEMPT TO CHARGE ANY FURTHER The breaker may now be closed by lifting the spring release trigger plunger behind the Plexiglass guard marked Lift to Close PUFFER The purpose of the puffer is to speed up the interruption of currents below a few hundred amper...

Page 45: ...BASIC OPERATING INSTRUCTIONS The arcing contacts are the same for all ratings of breakers They also are made of zirconium copper but of heavier material with silver tungsten arc tips For this reason they are not tightly bolted to the contact block but can pivot slightly under spring pressure They are backed up by compression springs A stop is in the center to limit inward travel POLE UNITS The pol...

Page 46: ...parts renewal may be required based on maintenance every 2000 oper ations If the breaker opens a fault before the specified number of switchingoperations is complete additional maintenance or parts replacement may be necessary depending on its condition at the time When interrupting current the arc is started at the arcing contacts and moves upward due to the iron of the blowout mag net and the he...

Page 47: ...ith the breaker Adjustment for contact overlap is by change in the effective length of the lift rod fective length of lift rod by adjusting the nuts at the top end of the rod To decrease overlap decrease effective length of lift rod The arc chutes in 3 To increase overlap increase ef The 13 8 KV breakers are packed in 3 crates the basic breaker unit in one crate 3 arc chutes in one crate and the b...

Page 48: ...ithout contact replacement The arcing contact fingers and the movable contact casting should be replaced when the thickness of the silver tungsten tips on the fingers at the points of first contact has decreased to l l6 inch The main current carrying contact de terioration will be mainly caused by mechanical wear There may be a small amount of pitting caused by opening very heavy faults Generally ...

Page 49: ...tripping cam and tripping latch adjusting screw Counterclockwise turning increases clearance In these operations closing and opening should be snappy without hesitation or sluggishness Under normalcircumstances that is if there are no signs of shipping damage or of anything interferring with mechanical movement this is a satis factory check for closing and opening of a breaker before placing it in...

Page 50: ...itch make Continue turning down ward to get about 1 16 inch overtravel on the switch When the closing spring is charged the clearance between the bolt head and switch push button should be 1 32 to 1 16 inch Particular care should be made at all times to keep the arc chutes dry The materials in the arc are not much af fected by humidity but the ceramic material especially will absorb liquid water H...

Page 51: ...away appreciable amounts of the ceramic When the width of the slot at its upper or narrow end originally 1 16 inch has been eroded to twice its original size about 1 8 inch the ceramic stack assembly should be replaced The ceramic arc shields may appear dirty and yet have sufficient dielectric strength may be used as a guide in determining when this complete or major cleaning operation is required...

Page 52: ... the same way and relubricated with Westinghouse M No 8577 3 4 16 KV and 13 8 KV Solenoid Mechanism Points to lubricate applied sparingly Front and rear tripping latch rollers Tripping trigger pivot pin All pins in closing and tripping linkage STORED ENERGY MECHANISM REMOVING INSTALLING SPRING CHARGE MOTOR Check the condition of the solenoid movable core If surrounding conditions are very dirty it...

Page 53: ...section Refer to list of illustrations for a figure that may show a part in question for a particular type or rating of circuit breaker Under normal conditions it should not be necessary to remove the closing spring during the useful life of the mechanism If it should be necessary due to accident or other unusual condition proceed as follows Renewal Parts 1 See Fig 14 Remove idler link and pin Lis...

Page 54: ...Movable contact pad Fig 15 item 20 14 Movable contact hinge pin 1200 amp Fig 15 item 31 15 Movable contact hinge pin 2000 amp Fig 15 item 42 16 Movable contact hinge spring washers Fig 15 item 37 17 Movable contact lift rod Fig 15 item 6 18 Puffer tube assembly 4 16 KV Fig 15 item 9 19 Puffer tube assembly 13 8 KV Fig 16 item 3 20 Kick out spring Fig 15 item 29 21 Disconnecting contactfinger clust...

Page 55: ... c or d c Fig 6 indicated 125 v a c or d c 230 v a c or d c Ground contact cluster Fig 6 indicated 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 Note Same as for pole unit parts CHASSIS PARTS Solenoid Mechanism Auxiliary switches same as for stored energy mech Latch check switch same as for stored energy mech Control relay X 48 v d c Fig 12 indicated 125 v d c 250 v d c Trip coil same as for stored energy m...

Page 56: ...LE Interrupting Ratings Amperes Voltage Ratings 3 Phase Inter rupting Rat ing Mva Amperes Countin uous 60 Cycles Min Kv for Rated Int Mva Ai r At Max Design Circuit Breaker Type Max Amperes Rated Voltage Rated Kv Kv 12 500 37 500 37 500 25 000 1200 10 500 35 000 35 000 21 000 4 76 3 5 50DH P75 50DH P250 50DH P250 I50DH P500 75 4 16 1200 250 4 16 4 76 3 85 4 76 250 2000 4 16 3 85 1200 15 500 13 8 1...