what is the different between surgearrester and lighting arrester

4 Answers   HPCL,

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why AC cannot to be stored and DC cannot be transmitted?

11 Answers   IBM,

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which network topology offers the greatest level of tolerance?

0 Answers  

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How to test the vector groups of 3 winding transformer & phase displacements

2 Answers  

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According to conduit size which size wiring & how many wires can we provide wires in conduit & how can we select conduit size accordingly?

0 Answers  

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Why we transmit the power at the voltage in the multiple of 11 or 1.1 like 11kv, 22kv, 66kv, 132kv...... some one told me that it is due to fomr factor 1.1 of sine wave. its fine but while transforming we can choose any voltage, so why only multiple of 1.1 there also.......? plz tell me.

7 Answers  

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What is the application of Nitrogen Injection system in Transformer Protection?

1 Answers   HPL,

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3 shows a 415 V, 3-phase generator supplying a 3-phase 415/110 V transformer. Draw the individual and combined impedance diagrams to a base of 10 kVA. Determine the system fault kVA and the fault currents at the 415 V and 110 V busbars for short circuit faults on the transformer input or output terminals. Work in p.u. values of impedances.

0 Answers  

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At the time of 1st charging of transformer, there were huge inrush current, so why at that diffrential relay are not operated? Why?

3 Answers   Adani,

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We have 250 KVAR cacitor bank & our average load is 200kva but our power factor is average 0.66 how can we maintane it? how can we balance our load?

4 Answers  

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Why is it not possible to operate a star-delta transformer in parallel with delta-delta transformer?

1 Answers  

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Which system use dc to dc high voltage gain A. Solar system B. Battery backup

1 Answers  

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