Answer Posted / bosky babu

DOL means Direct On Line Starter, can be used up to 7.5 HP Motor, and for above 7.5 HP to 150 HP a star delta starter is used.In automatic star delta starter, a timer is used to switch on the delta contactor. For higher HP ratings VFD (variable frequency drives) can be used.

5- What is the task (function) of the excitation and isolation transformers in power plant? 6- What is the task (function) of LCI (A), LCI (B) and LCI (COS) in power plant? : LCI (A) and LCI(B) are load commutating inverter for generator turbine starting. , LCI (COS) is load commutating inverter change over switch

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what is meant by impedance & transient protection?

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How to check the thermocouple is correctly connected to cable for K type? (i,e positive pole is connected to non magnetic conductor and negative pole is connected to magnetic conductor)

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How can we calculate strength of copper hich is supplying electric power to heater and in it hold the heater also and what r all types of forces which is acting on it...

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CALCULATE THE TOTAL VOLTAGE DROP AND SELECT THE CABLE SIZE IN MM-SQARE FOR A PANEL-262KW AT 110 METER FROM THE SOURCE SUPPLY , SUPPLY VOLTAGE 240/415

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please send me last 5 year interview questions

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substation+ plc system

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what happen as when voltage drop(or may decrease) ? in case of atomic base theory?

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what are the possible reaons & remedies if resistance of NGR getting heat up

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What is the loss of power of transformer 220kv/33kv,63/80mva of % imp12.05 at 80%load

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Pl.brief me any electrical major fault you have rectified.

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How many types of instrument cables are there?

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What do you mean by ratio correction factor of instrument transformer?

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what is a bus post insulator? explain its application in a substation.

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What's the difference between non break power supply and non break non short break power supply

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