Answer / meka sekhar

three phase over laod relay can also be used for single
phase also. In this case, three overload relays shall be
wired in series with single phase circuit. The current
flowing through this relays will be detected whenver over
current flows and trip the breaker.

Answer / karna

In Three Phase relay Three terminals are there , use two
terminals in series with phase and one terminal for
Netural . Why we are connecting like these because balance
current will flow in the relay, then only if any fault(
O/L, E/L) occur it will trip

if dc excitation is used to produce manetic flux in rotating machines then ehy it is not used in transformers.

4 Answers  

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We have a 12MW power plant & we inject 5-6MW power to Orissa GRID. For this we have a 33KV/11KV switch yard having 12.5MVA power transformer. Some times we draw power during emergency. It is observed that during Export or Import for load less than 500Kw the power factor is decreasing to 0.3 . This is happening only during export or import. During island condition TG power factor OK.Our capacitor bank is provided with our Power plant auxilliary load. Please suggest how I can we improve our power factor during low load (GRID).

3 Answers  

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0 Answers   IBM,

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what is first pole to clear factor ?

3 Answers  

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will there be any problem by recovering slip from single phase induction motors?

0 Answers  

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what is difference between 5A and 100A CT constructional wise and operation?

1 Answers  

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Is KCL applicable for close circuit?

2 Answers   Toto,

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A ray hit a smooth regular surface at an angle of 20 from the normal. Calculate : 1. The angle btw the incident and reflection ray. 2. The angle of deviation.

0 Answers  

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How o select the electrical fuse?.What are its characteristics.How to select the material od fuse?

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in transmission line 11kv is step up or step down? why?

5 Answers  

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