Answer / nandakumarp

normally used 110v dc for tripping and closing coils

Answer / liladhardanej11

depend upon as per control supply i think normally used 110v & 127v ac

what the purpose of protection signaling equipment in substation?

2 Answers  

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What is auto transformer?

28 Answers   ABC, Transformers and Electricals, US Consulate,

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there is a power transformer 66/11kV in delta-delta connection has 5 feeder coming out from the secondary side. One of the feeder in it normally loaded (loaded than other feeder)and this feeder usually trips with double OCR causing the bank transformer to trip. Now if the load of this feeder is put on other transformer then that no problems occurs on that transformer or the load. However normally all the test(IR, PI, short ckt, open ckt,grounding test and other ) has been conducted for this but evertything transformer..... I am not geting what is the actual problem...

2 Answers  

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Do you know what is dry-out test in x'mer

0 Answers   First American Corporation, GPSC Gujarat Public Service Commission, Jindal,

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what are the differences between 'exhaust fan', 'heavy-duty exhaust fan' & 'super heavy duty exhaust fan'. what are their power ratings ?

0 Answers   CG,

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A cotter joint is generally used to transmit

0 Answers   Caterpillar,

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What is battery Amphere-hour? How the battery back up time period is calculated?

2 Answers  

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The purpose of a choke is to provide a ?

1 Answers  

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When to use Oil Transformer type and When to use Dry type? What is the difference between both?

2 Answers   ABC,

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how can I improve the current at same voltage? if yes is there any circuits?

2 Answers  

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how rated the neutral voltage of transformer and reactor, e.g. 400/220, 200MVA transformer have neutral voltage of 33kv. and reactor voltage 145kv. how this rating decided?

1 Answers   MEIL,

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Hi All, I am working as a Technical executive in a MNC company and we have 1500KVA & 1250KVA T/F in our site, can you help me that how many maintenance tests can be conducted and what are the procedures included for the tests can you share yours answers and also give any web address to get more information on this

5 Answers   Hyundai,

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