ABB COQ Instruction Leaflet Download | Manualshive

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Summary of Contents for COQ

Page 1: ...y coil of this electromagnet by transformer action of the main coil Both coils are located on the center leg of the electromagnet Current flow is from the secondary coil to coils on the outer legs of the CAUTION Supersedes I L 41 161H Dated July 1984 Type COQ Negative Sequence Generator Relay 50 60 Hertz electromagnet The reaction between the outer leg coil fluxes and the main coil flux creates an...

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Page 3: ... 3 is used with a machine full load current of 4 Typical time current curves of the relay are shown in Figure 7 Minimum pickup is approximately 0 6 of the tap value current See Table 1 for burdens and termi nal ratings 3 2 Trip Circuit The main contacts will safely close 30 amperes at 250 volts dc and the seal in contacts of the indicating contactor switch will safely carry this current long enoug...

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Page 5: ...ly approximately 5 amperes 3 phase positive sequences current on 3 amp tap and see that relay does not operate Set relay at 11 time dial and jumper terminals 2 6 and 8 Set tap 3 and apply 26 0 amperes through ter minals 3 and 7 See Figure 10 IA 26 0 and IB 26 180 amperes Therefore negative sequence 15 amps Time of operation with relay in the case should be 3 2 seconds 8 Repeat test with relay on 5...

Page 6: ... time dial until stationary contact is deflected against the backstop Adjust if necessary so that 0 mark on time dial coincides with index Then with time dial at 0 wind up spring until about 5 1 2 con volutions show From this preliminary setting and using 3 tap and time dial setting of 11 adjust the permanent magnet until the relay operates in 8 2 seconds with 15 6 amperes single phase or 3 per un...

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