Answer / sundarrajan

based on the secondary voltage

How to calculate cable size in sq units based on motor rating is KW

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AVR

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what is first pole to clear factor ?

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Working of microwave oven?

0 Answers   LG,

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what is thermal resistance of PVC Cable.

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what is differentila pilot supervision in the incomer control panel in the power station?

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What is stepper motor?

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on what priciple transformer works on?

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HT/LT TRANSFORMER TEST?

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please give me all the Alarm .Trip ,Safety Relays & Conditions of UPS Systems mail me on ashokbabunhce@gmail.com

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One of our gas turbine generator unit "1st stage rotor ground fault" alarm was occured several times. we tried to measure some voltage vulue ground fault protection relay (UNS3020a made by ABB and we measured the value of: Ground: 0.9VDC 5V: 5.8VDC 24V: 23VDC u+: 300 – 350mVAC Rf1: 17.5mVAC Rf2: 17.6mVAC The unit still running and the alarm was reset. As of 6pm yesterday and unitl now no alarm happened again. I our protection relay was defective?

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What is the disadventage of gland earthing(power cable) if any. ?

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