Answer / gulwinder singh

current transformer steps up the voltage level thus current
come in the range of measurement, we can measure the
current easily
potential transformer steps down the voltage level thus
voltage come in the range of measurement, we can measure
the voltage easily

last week we did the REF relay test by closing single pole (R phase) of CB and apply 380V at the primary of delta transformer. we get 33A at the primary of the R phase star end. but we get 380A at both R an B in delta side. how and why?

1 Answers   Siemens,

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what is meant by transformer differential protection ?

3 Answers   BFL,

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in indoor type circuit breakers why only the corner breaker trips specially during cold season. What is the reason.

0 Answers  

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During the main stator winding insulation testing (phase to ground)of 11kv alternator (Lerysomer) i found 0 and resistance with multimeter and found 20 killo ohm while the power cables are connected both end (Generator & VCB). In VCB PT (Potential transformer) are connected. Please any body explain that method of insulation is correct or not? also describe of PT connections

1 Answers   Private,

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how much LT load can bear by the 100 KW HT connection.

0 Answers  

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AC current is flowing in a wire in your home how can you measure it(name of the instrument)

24 Answers   NTPC, TCS,

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After synchronization with grid what is the demand value QKVAR and how we will maintain that?

0 Answers  

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Pls Breifly explain about UPS (Inverter,Reserve,Rectifier,Float voltage,Boost voltage).

0 Answers  

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Generally the incandescent lamps in bathrooms fuse due to high voltage at night.What is the simple solution of this problem?

4 Answers  

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what is use of starter motor in DG ?

2 Answers  

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How can calculate rotor temperature of the alternator? and is there any method to calculate that

1 Answers  

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What is the function of the exiter in DG.

3 Answers  

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