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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why trasformer rated in kva why should have to maintain pf in our site 0.9

3 Answers   Dalkia,

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why the power cut problems occur in tamil nadu? may i know the exact reason.plz

17 Answers  

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What the difference between three phase contactor (coil 110vac) & three phase SSR (control voltage 110Vac)? May I use contactor in place of SSR?

0 Answers  

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Can any horizontally mounted motor be used as vertical?

5 Answers  

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Explain Random and Deterministic signals?

0 Answers   UOG,

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Can we use 11kv Trivector Metre or Energy metre instead 33kv Metre at 33kv Over Head Line metering purpose?

5 Answers   Bhel,

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A parallel flow heat exchanger will perform better than a counter flow heat exchanger. State if the statement is true or false.

0 Answers   Blue Star,

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an electric bulb or lamp can operate on ac and dc, if yes then why

5 Answers  

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how much distance is required for earth pit to earth pit in substation???

3 Answers   Divis Laboratories,

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how many BUSBAR is in electrical system?

3 Answers  

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suppose there is afault in transmission line connected to a generating station, then what r the adjustments u will take to without loss of synchronism?????

2 Answers   NTPC,

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