Answer / k.prakashchandra

The overload relay may be set at 110-120 % of the rated
current of the motor

What is the need of earthing transformer for delta side of a transformer. (Think of a line section between a star/delta transformer at a grid substation and delta/star transformer at a village. An earthing transformer is there at the delta side of the star/delta transformer at grid substation). As there are no ground reference there will not be fault current if a one phase is grounded. Further L-L phase will be sensed by the primary side of star/delta transformer as a L-G fault. So why an earthing transformer is required at delta side

0 Answers   CEB,

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What is the rating of HT SUBSTATION and LT SUBSTATION?

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What is meant by unilitrel device?plz tell about h-parametrs

1 Answers  

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Can be ammeter and voltmeter used without CT? if not, what is the reason for that?

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According to general circuit diagram of 1-Phase t/f , why the primary is not get short circuited ,even though the supply terminals both are directly connected through primary winding?

4 Answers  

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in a live circuit with a light bulb such that the bulb is off by a switch, is the light glows if the switch 2 terminals are both touched by a mouse?

1 Answers  

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What are the relays in ACB and VCB

0 Answers   ABB, Bhel,

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29 Which of the following breaking method save energy? A regenerative breaking B plugging C dynamic breaking D none of above

1 Answers  

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In domestic supply, when neutral touches earth the earth leakage trips. Does this mean that if the star (neutral) point of an alternator is earthed that power will flow to earth i.e. a direct short to earth?

1 Answers  

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if the rotor of induction motor is purely inductive then what is the electromagnatic torque.........

1 Answers  

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what is power ratio between star & delta connection of 3 phase induction motor

1 Answers  

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what is the difference between KW and KVA?

15 Answers  

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