Answer / amarjit singh

becase in neutral always unbalanced current flow in 3 phase system if current in amp R=25 A,Y=22 A AND B=20A only 5 amp current flow through neutral thats why in 4 core cable neutral diameter less than phases .try it practically

1.what is the basic difference between surge arrestor and lightning arrestor and where we use it. 1.what is the difference between metal oxide without gapped lightning arrestor and with gapped lightning arrestor

2 Answers  

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what is significance of B-H curve? how it differs form ordinary transformers to Amorphous Transformer?

2 Answers   BARC,

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If we have 15000kw connected load in a factory than how much power demand sanction should be taken from electricity board. Pls provide complete calculation.

3 Answers  

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why Line voltage =1.732XPhase voltage what mean by 1.732

4 Answers   IBM, NCC,

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We wish to test 60 Hz systems from a 50 Hz supply. To acheive frequency conversion, we use a VFD. The VFD powers 40 kVA transformer, which has motor and non-motor loads on it. Will the transformer work?

2 Answers   Suzlon,

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What is application of MCB & How it works

1 Answers   TATA,

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What is the effect on in Zone and out zone fault if Phase side CT is Vk/2<30 mA and Neutral side is CT is Vk/4<30 mA for Transformer REF protection

0 Answers   ABB,

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how power can be saved using VFDs in detail explain

1 Answers  

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why in a swquence network representation, the negetive sequence generated voltage is taken as zero?

0 Answers  

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how fault in an electric system is detected & hw protection of equipments is done ?

6 Answers   NTPC, RLY,

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what is the function of Choke?

9 Answers   Airport Electrical, Cummins, Tamco,

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What Should be the value of Vector Surge angle at Tripping and how to calculate it?

0 Answers  

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