Answer / p.r.gowri sankar

The "Safety protections of the Transformers" are fallows
1.Neutral Earthing
2.Bucholtz Relay
3.over Current Earth fault Relay
4.Differential Voltage Relay
5.Instantaneous Voltage Relay
6.Earth Leakage Relay

We wish to test 60 Hz systems from a 50 Hz supply. To acheive frequency conversion, we use a VFD. The VFD powers 40 kVA transformer, which has motor and non-motor loads on it. Will the transformer work?

2 Answers   Suzlon,

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It is advisable 2 use auto-transformer if transformation ratio is-a)110KV/11KV,b)230kv/110kv,c)110kv/66kv,d) 400kv/230kv

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Why do we need a separate control desk & PLC control panel in Boiler plant or coal handling plant? Can we provide cost effective Control desk cum PLC panel. Is there is an specific need for control desk.. kindly advice.

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my 10 hp submersible pump is tripping when connected through ELCB.I have checked the megger value of the coil's with body.It was found to be 0.2mega ohm.that is leakage is there.But when connected to mccb it is not tripping.no leakage current in the motor.Is it safe to connect to mccb? what are the problem's will arise if future?also tell me in ELCB no neutral is connected to motor.than how ELCB was working?

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Formula to calculate amps rating when we are having only the width & thickness of the coppper ?

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which frequency is to be selected for measuring earth resistivity

1 Answers   MSETCL Maharashtra State Electricity Transmission Co Ltd,

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?? how to calculate lighting system ????

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what is the difference between synchronous motor and induction motor?

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why we use to transmit the power in three phases intead of single phase ?

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role of shunt coil in circuit breakers

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