Answer Posted / shri..

Assuming secondary side Voltage 415

Approx = 34.78/Phase

how can I calculate charging current of cable/overhead conductor? what is roll of voltage in it ?

3615

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Can we use shunt trip coil instead of trip coil with protection relay for protection?

1691

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How to arrange a hous hold earthing system to keep minimum earth resistance( below 7ohms).

1893

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Can anybody tell abt concrete encased earthing or grounding?

1997

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how the synchronizing is obtained at bus couplers in grid substation? (because there we cannot change the frequency in one of transmission lines like in generator synchronization)

2294

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The SFC of an engine is 0.25 kg/kW hr. when the fuel used has a calorific value of 36000 kJ/kg. the thermal efficiency of the engine is

1886

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explain different losses in a transformer.

1056

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Can anyone tell the proper diagram of star delta starter????

1872

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how can i reduce sparking without stepdowning the voltage

2468

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for what purpose the star point is done in ct

1353

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234 MVA Generator 3 phase Short circuit current Values required? Gen set Rating-234 MVA, Gen Voltage-18kv, PF;0.8, Xdv:23.5 %, Transformer Rating-18/380KV, 680MVA,Yndd1 two winding, Step up TR, ZT:35.50 %,X/R 4.33 Gen CB Position, CB open ,Disconnected open, Generator Running Voltage 18 Kv, Bi mistakes generator side earth switch Closed during that time short circuit current level in 3 Phase required, and how to test on site 234MVA Generator Short circuit current,

2170

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63MVA,220KV/6.9KV Transformer LV side neutral is connected to Earth pit through NGR. Whether this earth pit required to connect with near by below grouding earth mat or it is to be kept separate?

2675

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What is Percentage impedence of a transformer? why it is expressed at a percentage? what is the importance of percentage impedence in case of a transformer?

1833

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ROC converges if poles and zeros lie inside a. Origion b. Z=1

2198

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can the measured percentage error during calibration of single phase energy meter be negative?

2348

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