Is a synchronous generator running a constant load has a longer lifetime than a generator running a variable load? If yes why?

Chandan dubey

• Nov 11th, 2016

It can be run but in practical there is necessary to change it. So if change in load in other gen. Will result change in current and load angle (angle between Sand v) and also change in active power, for which it will be need to arrange frequency regulating equipment, so overall cost will increase.

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What should be earthing between Earth to Earth in industries ?
How we get no of earth pit in company.?

Devang

• Dec 8th, 2016

Earthing system depends upon the soil resistivity, to calculate the no. of earth pit. one should know the soil resistivity. only after that you may calculate no. of pits, treated or un treated earth p...

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What type of effects are produced in transmission lines due to mutual inductance and due to self inductance?

pradeep

• Apr 27th, 2017

Answer is both. The primary EMF in transformer is induced by the self induction, whereas the secondary EMF of the transformer EMF is induced by the mutual induction. Here is the main question what pri...

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In a Manufacturing Factory, it is observed regularly the power cables are bursting resulting in fire even though branded cables are used. Identify the cause of bursting and guide to avert any future disaster of cable failure leading to mega fire accident.

Mayilsamy Kasipandi

• Jul 11th, 2017

Commonly two reasons.
1. Loose connection in the lug termination or connectors side
2. Cable rating is under capacity

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What is the primary impact on the transformer performance if more than the rated KVA load is put on the transformer?

Prakash

• May 9th, 2018

Primary circuit breaker will be blown out, also reclosure could damage at grid.

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Nishant Choudhary

 Profile Answers by Nishant Choudhary Questions by Nishant Choudhary

• Jun 3rd, 2011

The current produced in the armature is ac current but the commutator segment and the brushes acts as mechanical rectifier which converts ac voltage to dc voltage

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guthajimmy

 Profile Answers by guthajimmy Questions by guthajimmy

• May 3rd, 2011

SLIP-POWER: A PART OF THE AIR-GAP POWER  WHICH IS NOT CONVERTED INTO MECHANICAL POWER IS CALLED SLIP POWER. IT IS REPRESENTED BY sPg.          &n...

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How to set the various setting value of a relay depend upon the electrical motors ?

Nishant Choudhary

 Profile Answers by Nishant Choudhary Questions by Nishant Choudhary

• Jun 3rd, 2011

Its very simple first note the current rating of the motor on the name plate then adjust the current setting just above the name plate motor of the motor

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raviiisc

 Profile Answers by raviiisc Questions by raviiisc

• Jun 9th, 2011

It is due to the interaction of one flux and one current.For example in Motor (induction motor 3-phase), the stator flux interacts with the rotor current leads to torque development.Somebody also says...

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What is a ferroresonant transformer and what is its working principle?

Nishant Choudhary

 Profile Answers by Nishant Choudhary Questions by Nishant Choudhary

• Jun 3rd, 2011

Ferroresonant transformer are constant voltage transformer they maintain the output power to constant for any variation in input

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For 600 MW Generation Purpose.

raviiisc

 Profile Answers by raviiisc Questions by raviiisc

• Jun 9th, 2011

It will be 30 to 45 degrees.We wont allow the generator to operate at its maximum power transfer such as 90 degrees.At this the reactive power supplied by generator is the leading reactivepower. But w...

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What are contactors and why are they used in circuits can they protect the system from fault current ?

Ibrahim Baklawa

• Jul 20th, 2011

1st. what type of fault current? we have lot of faults.. for ex. over load, short circuit, earth fault we can use: over load relay. fuses. toroid. CB with over current and short circuit protection. CT...

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what is the purpose of zig zag transformer? . How it is different from normal transformer?

suresh

• Jul 29th, 2011

A Zigzag transformer is a special purpose transformer with a zigzag arrangement. It has primary windings but no secondary winding. One application is to derive an earth reference point for an ungrounded electrical system. Another is to control harmonic currents

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How does a AC drive work? Why does not AC motors blow up when testing dead short but it would if you put DC on it?

How to design inductive load for 3 phase 440v and maximum 5 amps for star or delta?

How to calculate and manufacture the 5P20 class CT with require knee point volt?

Can you test a VFD panel with Resistive load banks? If Yes, How?

The power is -ve for the first 2ms and then it will -ve What will be the P.F. Angel?