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Type CWC and CWP Directional Ground Relay

41-242.2F

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Summary of Contents for CWC

Page 1: ...nk neutral is not available the type CWP relay is applicable 2 0 CONSTRUCTION The type CWC and CWP relays consists of an oper ating unit an indicating contactor switch and optional indicating instantaneous trip unit In addition to the above components the type CWP relay has a phase shifter network The principal component parts of the relay and their locations are shown in Fig 1 8 2 1 OPERATING UNI...

Page 2: ...41 242 2F Type CWC and CWP Directional Ground Relay 2 ...

Page 3: ...Type CWC and CWP Directional Ground Relay 41 242 2F 3 ...

Page 4: ...ottom of the cover A core screw accessible from the top of the switch provides the adjustable pickup range The minimum and maximum pickup points are indicated on the scale which is located to the rear of the core screw 3 0 OPERATION AND CHARACTERISTICS The operating torque for the CWC relay is obtained by energizing the lower pole coil with residual current usually obtained from the line current t...

Page 5: ... 60 Hertz time product curves for the type CWP relay are shown in Fig 11 These curves are taken at maximum torque which occurs with the cur rent lagging the voltage 60 For currents not lag ging by this angle the relay tripping time may be obtained by determining the operating time corre sponding to the product p P Cos 60 6 where P is the actual relay V A product and a is the angle the current lags...

Page 6: ...25 or 250 volt d c type WL relay switch or equiva lent use the 0 2 ampere tap for 48 volt d c applica tions set relay in 2 tap and use S 304C209GO1 Type WL Relay or equivalent 4 4 INDICATING INSTANTANEOUS TRIP IIT Since the minimum and maximum markings on the scale only indicate the working range of the core screw the core screw must be adjusted to the value of the pickup current desired The namep...

Page 7: ...Type CWC and CWP Directional Ground Relay 41 242 2F 7 ...

Page 8: ...41 242 2F Type CWC and CWP Directional Ground Relay 8 ...

Page 9: ...ng time interval It includes the circuit breaker operating time plus a factor allowing for dif ference between actual fault currents and calculated values differences in individual relay performance etc For 8 cycle breakers the value of 4 second is commonly used while for 30 cycle breakers 75 sec ond is used As an example a type CWC relay is to be connected at Station A and set to protect the line...

Page 10: ...me lever in Column 14 is a matter of trial and error The breakers on this system have 8 cycle operating time so that the coordinating time interval should be about 4 second The tap should be chosen so that the relay times for the close in fault and remote fault product values will differ by about the coordinating time interval or 4 second in this case Practically this can be accomplished by severa...

Page 11: ...relays In the example the coordinating time interval was 0 4 second Therefore for fault 2 the relay at D should not operate before the relay at F plus the coordinating time interval In other words the operating time of D should not be less than 0 13 second plus 0 4 0 53 second Similarly the time of the relay at breaker H should not be greater than 0 13 second in order to select with relay F for fa...

Page 12: ...ct the stationary contact to a position where the stationary contact is resting against its backstop The index mask located on the movement frame will coincide with the O mark on the time dial when the stationary contact has moved through approximately one half of its normal deflection Therefore with the stationary contact resting against the backstop the index mark is offset to the right of the O...

Page 13: ...alf of its normal deflection Therefore with the stationary contact resting against the backstop the index mark is offset to the right of the O mark by approximately 020 The placement of the various time dial positions in line with the index mark will give operating times as shown on the respective time current curves For double trip relays the follow on the stationary contacts should be approximat...

Page 14: ...red The nameplate data will furnish the actual current range that may be obtained from the ITT unit 9 0 RENEWAL PARTS Repair work can be done most satisfactorily at the factory However interchangeable parts can be fur nished to the customers who are equipped for doing repair work When ordering parts always give the complete nameplate data 10 0 ENERGY REQUIREMENTS ...

Page 15: ...Type CWC and CWP Directional Ground Relay 41 242 2F 15 THIS PAGE RESERVED FOR NOTES ...

Page 16: ...ed in U S A ABB Automation Inc 4300 Coral Ridge Drive Coral Springs Florida 33065 TEL 954 752 6700 FAX 954 345 5329 41 242 2F Type CWC and CWP Directional Ground Relay visit our website at www abbus com papd ...

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