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Westinghouse CN-33P, Instructions Manual

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Westinghouse CN-33P Instructions Manual Download Page 2

Fig, 

1 

Type 

CN33P 

Relay,  Front  View, 

2 

TERM INA L  S CREW 

HOLE 

CLOSE  CONTACT 

(STATIONARY) 

MOVING  C ONTACTS 

TRIP  CONTACT 

(STATIONA RY) 

SPIRA L  SPRING 

ADJUSTER 

FRONT  BEARING 

TRIP  C URRENT 

ADJUST ING  PINION 

COUNTER  WE IGHTS 

CLOSING  VOLTAGE 

ADJUSTING  SPRING 

CLOS ING V OLTAGE 

ADJUSTING  S C REW 

MOUNTING  H OLE 

www 

. ElectricalPartManuals 

. com 

Summary of Contents for CN-33P

Page 1: ...n knife edge bearings Since this type of bearing is placed at the center of the shaft friction is reduced to a minimum Phosphor bronze retaining rings encircle the ends of the drum shaft End thrust is...

Page 2: ...CONTACT STATIONARY MOVING C ONTACTS TRIP CONTACT STATIONARY SPIRA L SPRING ADJUSTER FRONT BEARING TRIP CURR ENT ADJUST ING PINION COUNTER WE IGHTS CLOSING VOLTAGE ADJUSTING SPRING CLOS ING VOLTAGE AD...

Page 3: ...1 TERMINAL SCREW Fig 2 Type CN33P Relay Rear Cutaway View DAMPING M AGNE T VOLTAGE COIL ASSEMBLY REAR B EA RING CURRENT 8 PHASING COIL ASSE MBLY MOV ING E LEMENT STOP D R UM 3 w w w E l e c t r i c a...

Page 4: ...mly into engagement with their associated jaws These jaw assemblies are free to move in their molded insulation blocks so as to be self aligning The heads of all terminal screws are accessible from th...

Page 5: ...VICE NUMBER CHARTS FOR FT TEST SWITC H DEVICE FOR RELAY NUMBER TS T THERMAL TS NI NETWORK TS N2 NETWORK TS P PHASING r f ill 52Z 52Z 57 52Z 52Z 52Z 57 9 9 5 7 57 T T l 12 l 2K 3 1K 1 2K f I S T N2 G H...

Page 6: ...330 340 380 0 10 2 0 30 320 310 290 280 260 100 2 50 130 140 210 200 190 180 170 160 150 Curve 471102 Fig 5 Typical Closing Phase Angle Curve lor the CN33P Relay 6 w w w E l e c t r i c a l P a r t M...

Page 7: ...sing voltage will be zero In this case there will be no electrical torque produced except the voltage only torque produced by the potential coils This torque is suf ficient to overcome the tension of...

Page 8: ...circuit is used to obtain the desired tripping phase angle characteristic 8 CHARACTER ISTICS Figures 5 6 7 show the operating character istics of the type CN33P primary network relay for balanced 3 ph...

Page 9: ...nly torque is overcome and the TRIP contacts close when 2 4 rna in phase current flows toward the transformer SETTINGS Set the voltage closing adjusting screw for the desired value Adjustment range is...

Page 10: ...Mechanical Adjustment A Set contacts See Settings The moving contacts 10 are adjusted such that the contact springs are just touching their support Just touching is determined as follows With the rel...

Page 11: ...milliamp three phase If the trip cur rent is not within this range the following re adjustments should be made a If the trip current is high change the spiral spring setting by turning the pinion one...

Page 12: ...WESTINGHOUSE ELECTRIC CORPORATION RELAY DEPARTMENT NEWARK N J Printed in U S A 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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