1)Why potential transformer primary site grounded? 2)can be loop between neutral & body for grounding? 3)What is the difference between ELCB &RCCB? 4)Why we use iron core in transformer insted of wooden core? 5)what is the principle of excitation? 6)Why we test the core balance test for transformer? 7)what is creepage?What is the creepage length for insulators at different voltages? 8)How much type of relays used for differential protection of generator,transformer & busbar protection?

5 Answers  

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why we use iron corn in transformer instead of wooden core

12 Answers  

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why insulation cost is more in underground cable than in overhead line?

2 Answers  

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which oil used in transformer?

5 Answers  

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Why we are using air gap magnetic condutors

2 Answers   Ford, IOCL,

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During Millivolt drop test current leads are applied in the extreme ends and voltage leads are given just before the current leads.. what will be the difference if voltage leads are given in the extreme ends? and why?

1 Answers  

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how to calculate units consumption for a 12 hp motor /hr.

0 Answers  

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what is the reason the main breaker is trip during the motor is running? (some time the breaker is not trip)

0 Answers  

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Dear sir,We have a 7.5hp motor,it was running smoothly and suddenly one winding is carring more current then others(r=6.5,y=6.3,b=10)..whts wrong with tis...?

5 Answers   Hindustan Motors,

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type of transformer

3 Answers  

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Advantages of using generator circuit breaker (GCB) scheme in a power station ?

0 Answers   Gridco,

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Why in India distribution transformer are connected in Dyn11 when we know capacity of v-v connection can be increased by adding only a single transformer?

1 Answers   CSPL,

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