purpose of breaker contact multiplication relay?

5 Answers   ABB,

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We have a couple of oil tanks at our plant. One of them does not have a lightning arrester installed. My question is it necessary to install an arrestor on every tank or will this particular one be covered by the arrestor installed on the ajdacent tank, Since all the tanks are close to each other. Basically, I want to know that if these arrestors or protection works in a parituclar area of effect or influence. Thanks

0 Answers  

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If the positive terminal of batteries in 125 v dc system is connected to earth what will happen ?

4 Answers  

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kva/kvr

2 Answers  

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why DG rating in kva

6 Answers  

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what is the fullform of mccb

10 Answers   Thermax,

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Why does not AC excitation use in rotor of AC Generator instead of DC excitation?

2 Answers   A2Z Group,

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We have 800KW motor operating at 6600Volt,50 Hz supply.During 1st startup it tripped on overcurrent trip.It's FLA is 88 Amps.The K factor of Thermal overloaaad was set on .94 initially.then we set at 0.97 and then it started fine.i dont understand why it tripped first?What are the protections which comes in picture during starting ?

6 Answers  

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why we use two slope(differential & restraining) in differential relay.but in busbar protection differential we are using only one slope?please explain

0 Answers   ISRO,

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We order Dyn 5 distribution transformer to a company. What arrives is Dyn 11. Is it ok to use this transformer. It will be installed alone.

3 Answers   G&S Construction,

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What happens to a line-frequency of high-frequency transformer when it is first energized/ re-energize?

0 Answers  

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what are trouble functions of transformer?ex. prv trip,oltc,oti,wti.explain detail.

1 Answers  

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