Answer Posted / guest

There is no DC VVVF because frequency came under AC only

what is the meaning of 5% droop or 7% droop in AVR?

2370

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features of hbc fuses

2473

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why the frequency and voltage in india is 230v and 50HZ. when compared to USA say 110v and 60 HZ.

1505

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how to calculate earth fault relay current and CBCT ratio

8397

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Define characteristics impedance?

1179

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with 3 phase board on a 63 amp rcd is it ok to have 6 electrical showers 2 on each phase and what problems could happen

1881

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What is diversity factor in electric installations?

1224

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what is difference between 9kv 5ka surge arrester and 9kv 10ka surge arrester.

1905

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Explain what is clipper and clamper circuits?

1226

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In a power conditoining unit (inverter) of a solar plant when we measure the d.c. current fed by different strings of solar plates to inverter, the current in the negative wire is less almost by 1 ampere to the current in its positive wire say current in positive wire 5 A , then current in negative wire of the same string is 4 A. Since the current entering should be equal to current leaving then why the current is noticably less in negative wire.

1650

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A TRANSFORMER 440/400V,DELTA/STAR CONNECTED.THE NEUTRAL CONNECTED WITH GROUND CABLE THAT IS DIRECTLY CONNECTED TO THE PANEL,FROM PANEL IT IS CONNECTED EARTH PIT.IS IT RIGHT? IF IT IS RIGHT LEAKAGE CURRENT AFFECTED.SECONDATY IS PROTECTED WITH EARTH LEAKAGE RELAY.

2168

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why do you add the load short circuit impedance when considering short circuit amperage. It seems that you should only consider supply. If you need to consider loads and you don't know what loads are to be added , what would be a good sub-transient reactance rating for the loads?

1835

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Why do not we prefer non conventional sources of energy to conventional sources?

1242

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What is slope...? Explain slope 1 and slope 2...?

1655

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What is the use of oil in transformers?

1160

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