why we use REF and Differential Protection in one transformers?my doubt is both protections are operated in internal fault only.why we want to use 2 protections?please clarify.

7 Answers  

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how many number of terminals are available in CURRENT TRANSFORMER

6 Answers   MSETCL Maharashtra State Electricity Transmission Co Ltd,

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What is the basic principle of welding process?

0 Answers  

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hi i m going to attend bhel interview on 22nd sep 2008 for ET(electrical engineering).pls guide me how to prepare for the interview.i am a fresher.

1 Answers   Bhel,

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Why is a plain induction motor unsuitable for wide speed control?

0 Answers  

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WHAT ARE THE DFT AND RMS MEASURMENTS PRINCIPLE IN NUMERICAL TECHNOLOGY OF POWER SYSTEM ?? WHICH IS BETTER IN WHICH QUANTITY MEASURNMENT??

1 Answers  

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what is the principle of the single phase energy meter? and,what is the advantages and disadvantages of single phase energy meter?

0 Answers  

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how tubelight circuit is connected and how it works?

7 Answers   Punj Lloyd Ltd,

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what do you mean by the "bay" in a switchyard? how to determine exact number of bays in a substation?

8 Answers   Essar, L&T,

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List the characteristics of filter?

0 Answers  

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two TG running in parallel at equal load.one TG CB tripped in reverse power relay.after tripping found its excitation was on & turbine running at rated speed.Please clearify why that TG tripped in reverse power ?

1 Answers   Bhel, Birla,

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cleat wiring system is used at

2 Answers  

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