Answer Posted / adi

delta-star connection is used for stepping up the voltage to
a high voltage to a high voltage these are used in the
beginning of transmission line so that insulation is
stressed up to 58%of line voltage.....
similarly star delta connection is used for stepping down.

why capacitive load is not used in routine life????any reason is there ??????

1665

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Operation carried out in thermal power stations?

1062

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1.why should we connect the measuring instruments in l.v side in short circuit test of a transformer? 2.why the power factor is less in open circuit test of a transformer?

2015

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Is it a better option to procure screw type air compressor rather than reciprocating air compressor?If so, what is the reason?How should we select an air compressor(100 CFM)? Please mention the important parameters of air compressor.

1922

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what is the vvvf in the dumbwaiter?? or lift. what is the actual process?/

2034

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What is meant by reactance voltage?

1063

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How DC earth leakage currents can be reduced ?

1870

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2342

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

1815

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how to calculate maximum current

2271

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5- What is the task (function) of the excitation and isolation transformers in power plant? 6- What is the task (function) of LCI (A), LCI (B) and LCI (COS) in power plant? : LCI (A) and LCI(B) are load commutating inverter for generator turbine starting. , LCI (COS) is load commutating inverter change over switch

3751

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how mass curve differs from hydrograph.

1720

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At what speed 1 HP motor can run an electric car of weighing 400 kg?

1520

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How are load losses and no-load losses measured at site in a DG set?

1701

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in my industry we are using 3 step up transformers for induction heaters..i.e 415/580v and other are 11/440v.in power consumption does a step trnsformer makes any difference compared to step up?? plz explain

1804

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