when we given 3 phase supply to ups system, but out put comes with 3 phase + neutral how it possible? pls explain.

3 Answers   Enzen, Juniper Networks,

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is emf is indued if dc is passed through coil

5 Answers  

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What is tan delta point of transformer?

2 Answers  

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why we are using DC supply for all protection relays, why cant we use AC supply..???

1 Answers  

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how to reduce the magnetizing current in distribution transformers

1 Answers  

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Explain how you can give the overload setting to any Motor Protection Relay for a HT motors with formula and example?

0 Answers  

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why used in starter in tube ligtht circuit.

4 Answers   College School Exams Tests, HP,

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why are we using resistor in NGR ?

1 Answers  

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WHY THREE PHESE SYSTEM VOLTAGE APPLIED IN 440 VOLT

0 Answers   Infotech, InTech,

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A 100 kVA , 400 v/250 kv testing transformer has 8% leakage reactance and resistance on 100 KVA base . A cable has to be tested at 500 kv using the above transformer as a resonant transformer at 50 hz . if the charging current of the cable at 500 kv is 0.4 A find the series inductance required . Assume 2% resistance for the inductor to be used and the connecting leads . Neglect dielectric loss of hte cable . what will be the input voltage to the transformer ?

0 Answers   L&T,

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How can we calculate the resistance of earthing & how can we control it?

2 Answers  

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why transformer not work in dc

16 Answers  

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