Westinghouse COQ Series Installation Operation & Maintenance Download Page 12 | Manualshive

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WESTINGHOUSE ELECTRIC CORPORATION

METER DIVISION

NEWARK, N.J.

Printed in U.S.A.

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Summary of Contents for COQ Series

Page 1: ...end and a pin and olive bearing on the upper end Both shaft bearings as well SUPERSEDES I L 41 277A 4 enotes changed from superseded issue as their 2djustable pins are removable A set screw and nylon plug locks the bottom pin in position and a sho lder nut of the time dial locks the top pin in position Attached to an insulated section of the disc shaft is a rigid arm holding a small silver hemisph...

Page 2: ... generator characteristic at l per unit nega tive sequence current but at higher values of negative sequence current the relay charac teristic is substantially parallel and slight ly less than the generator characteristic In this manner a suitable margin of safety is obtained between the two characteristics Figure 2 defines the relay characteristics for two generators one with a permissible consta...

Page 3: ...RACTERISTICS TIME DIAL 3 f SET J II 2 5 2 1 5 1 r i GENERATORS CHARACTERISTIC 12 2T 30 2 12 T 30 _ 1 t I 1 s 6 7 8 9 1 0 1 5 2 2 5 3 4 5 6 7 8 9 10 NEGATIVE SEQUENCE CURRENT IN PER UNIT 1 0 PER UNIT TAP VALUE CURRENT Fiq 2 Comparison 0 Relay Characteristic With Generator Characteristic 27 D 554 3 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 ...

Page 4: ...w w 1 z u w J cr 50 _j I u I I I v I 0 rr i 0 I cr 40 w z J w I l l lJ J I I 30 z I I I J I I 0 lL 0 w n 0 20 J 0 u f _j 0 1 0 10 z 0 w f 2 3 4 5 6 7 8 9 10 II TIME DIAL SETTING 27 D 5609 Fig 3 Tirne Dial Setting Versus Permissible Constant Of Generator 4 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 ...

Page 5: ...5 20 15 10 9 8 7 6 5 4 3 2 5 2 1 5 TIME DIAL SETTING 6 _ 1 l 1 l t I 5 6 7 8 9 1 0 1 5 2 2 5 3 4 5 6 7 8 9 10 NEGATIVE SEQUENCE CURRENT IN PER UNIT 1 0 PER UNIT TAP VALUE CURRENT Fig 4 Typical Operating Curves Of The COO Relay 27 D 5544 5 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 ...

Page 6: ...o be protected The time dial indicates a I T K curve of a generator for which the relay protects By turning the time dial the relay can be used to protect generators with I T constants varying from 30 to 90 as shown in Fig 3 ADJUSTMENTS AND MAINTENANCE All the relays should be inspected peri odically and the time of operation should be checked at least once every six months or at such other time i...

Page 7: ...f the test connections is shown in Fig 6 Next adjust the spring tension until the relay will close contacts in 90 seconds with 5 2 ampe re s single per unit negative between terminals 8 phase tap value or one sequence current applied and 14 This adjustment is made by means of the spiral spring ad juster All spring convolutions must be free TRIP CIRCUIT Universal Trip This combination uses a 2 0 am...

Page 8: ... RESPONSE TO ZERO SEQUENCE 27 D 5445 Fig 5 Diagram Of Test Connections Of The Type COO Relay For Adjusting Filter To Have No Response To Zero Sequence 8 ordering parts always give the complete name plate data ENERGY REQUIREMENTS The burdens of the type COQ Relay are as follows Watts Volt Amps Power Factor at 5 Amps at 5 Amps Angle 5 3 5 3 00 0 0 98 90 Lag 4 0 7 25 56 Lag TIMER STOPS 10 s i ER 3v o...

Page 9: ... 0 92 TlltM tCKif w l U leQ 32 STVD FOR PI HEL LOCATION TM CK PANI L MTG FOR PRo JECTION ____ T fPE MTC 1 Olti J KR INT RNALSCH CUT OUT r Q SEHI FLUSH MOUNTING 0 rt2l j M TIC f Otl JEt r c GON_ T _ c rit c JTOUTl OR P1 0J CT ON MTC T IN PI NEI I PANEL I OCA1 0trrl FOR SEMI FW ot TVPE I m Fig 9 0utline And Drilling Plan Of The MlO Projection Or Semi Flush FT Flexitest Case 16 B 2477 9 w w w E l e c...

Page 10: ...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 ...

Page 11: ...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 ...

Page 12: ...WESTINGHOUSE ELECTRIC CORPORATION METER DIVISION 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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