Answer Posted / suresh kumar

There are many types of protection relays used in
transformers depend upon its construction, size, use etc.
They are
1. Buchholz relay for incipient faults like short ciruit,
winding temparature protection, oil temparature protection,
oil level protection, oil pressure protection, Pressure
relief valve (for oil filled transformers)
2. Differential protection
3. Thermal Protection
4. Earth fault protection
5. Over current protection
6. Over excitation protection(where OLTC is used) etc

Is better to supply the voltage for static exciter from the auxiliary power source or from the SG terminals? And why?

1932

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What is stepper motor. What is its uses?

1272

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EXPLAIN THE ESSENTIAL FACTORS WHICH INFLUENCES THE CHOICE OF SITE FOR A HYDRO ELECTRIC POWER PLANT

2253

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Why L.T.Cable voltage rating is 1.1kV,where as system voltage is 0.415kV?

2349

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what happen if the parallel generator phase angle shift by 1 degree in manual mode

2056

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How the PF control while running DG set with load

2180

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1.What will be stored in online ups EPROM IC?

2054

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Where is servomechanism used?

1234

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how can get electrical "c" licence.i am complited in DEEE.PASSING YEAR OF 1993.WORKING IN PVT COCERN LT LINE.PLEASE ADVISE ME .CELL NO 9994786021

1956

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Difference between RCCB, RCBO and ELMCB.

4089

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Can i use the B-curve MCB instead of C-curve MCB

2036

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why T/F winding temp measurement cts are odd secondary current ie,109A/1.2A/1.4A?

1867

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how does the thyistor work in dc drive?

1989

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I am getting above 60 V as open delta voltage against single phase unit ICT at tertiary delta formed and ICT getting trippped on NDR. ICT tested and found in order. PTs provided on tertiary are tested and in order. what may be the reason?

1890

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what is the main parts of transformer? how it is functioning? pls giv the ans briefly.

1964

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