Answer Posted / fajar

ow can I communicate with an Areva MiCOM P121 relay by
RS485 port? In other word, which command can I send and
what information can I have recieved? please send some
refrences, please. thanks

what is the difference between 2 way and 4 pole selector switch???

2489

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How to calculate cable rating for 3 phase supply?

2247

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what is PDU in transformer?? which company manufacture??

1956

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where rlc series ckt used?

2242

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Why it is necessary to isolate fire fighting when you are taking shutdown for lv board.

1682

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How to measure power in 2 or 4 or n phase circuit? Please give me a formula.

1958

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why Lightening Arrester Probe sharp at Top of telecom tower.

1606

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i need to now what will be the cable size to the following load, transformer to distribution panel distance 110m, load 1000kw, voltage 400v, pf 0.85, permissible voltage drop 2.0%, overhead line, atmospheric temperature 35 degree c.

1664

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I have a current transformer with 1 main reading meter with transformer outside the building and a control panel having 5 CT reading meters with black round coils inside the building. I want to know, A) when current pass through the Transformers, will the current be reduced or be the same and after that B) when current pass through the CT meters with black round coils, will the current be reduced or be the same. C) in the above process will the reading of the main meter be same or different, from the total reading of all the 5 CT meters.

1882

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what is active power & reactive power?

2273

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Explain cmrr?

1179

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Both generator parallel condition shared load equally but one genrator taking ampere more than the other what are all the causes to make like this

1806

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What is the maximum breakdown voltage of 11KVA and 66 KVA power line and how it is calculated?

2350

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what is W.T?specify the acceptable range?

2013

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What is pd controller?

1167

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