Answer / sachin k

Reverse power,E/F,over load,Over frequency,Under
Frequency,Over voltage,under voltage,loss of
excitation,short circuit etc.

Answer / ravi tandel

reverse power protection, merz price protection, etc.

Why is it that variation allowed in supply voltage to motors is (+ or -)10 %, whereas that in frequency is (+ or - )5 %

3 Answers  

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Why 30°phase shift occur in star-delta transformer between primary and secondary?

1 Answers  

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Why are cables rated for 40 KA for 0.25 Sec fault current rating?

0 Answers  

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What are the solutions for avioding sulfide formation at bimetalic (Copper &Aluminium)overhead joints?

2 Answers   HAL,

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what is the reqirred voltage in HT motor to get full RPM on no load test?

0 Answers  

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Why synchorised generators are used for the production of electricity?

0 Answers  

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How to calculate no of EARTH PIT? Describe the formula as per IS standard?

0 Answers  

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what is mean by hormonics & surge? and it's effects?

1 Answers   TCS,

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How out of step protection relay works?

0 Answers   APL,

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what are the standard transmision voltages in india?

9 Answers   Adani,

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Its possible to use 3core 2R of 240 sq.mm cable for 3phases & separely 50sq.mm 3core cable fully for Neutral for connection of PCC to MCC 3ph..4wire system?

0 Answers  

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Basic philosophy of applying 3P tripping for uptill 132KV switchyards & for 132KV & above 1P/3P tripping is used.

1 Answers   L&T,

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