Answer / vinayak

the basic difference between the load break and vacuum
circuit breaker is the arc quenching media or mechanism.
In load break switch the arc is quenched by lengthening
using arcing horns, whereas in vacuum circuit breaker arc is
quenched by the removal of the metals vapors from the media
which are created by the separation of the contact.

how to test vector groups in transformer differential relay.

1 Answers  

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Is it required to use 2 nos of body earthings to any machine though if we use TP with E supply is provided to Machine?

2 Answers   HAL,

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what happens if commutator is removed in an dc machine?

3 Answers  

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1 Answers  

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how can i get an electrical c-certificate?

0 Answers   Wartsila,

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2 Answers   Dr Reddys, L&T, Reddy Labs,

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0 Answers  

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Why is better to have a minimum ceiling voltage of 250% than 160%?

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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?

1 Answers  

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in gen traf what is ONAN , ONAF , OFAF and DYN

3 Answers  

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