Answer / goutam ghosh

Busbar size for a rated current can be calculated from
CURRENT DENSITY. Current density for copper is 160
amps/sqcm.(1000 Amp/sqinch.)and for Aluminium the same is
130 Amp/sqcm.(800Amp/sqinch.).Say for 200 amps reated
current Aluminium busbar of cross section 30mm X 5mm or
Copper busbar having cross section 25mm X 5mm should be
used according to nearest availability at market.

Stator of 3-phase IM has 3 slots per pole per phase. If supply frequency is 50 Hz, calculate the speed of rotating stator flux A 1000 rpm B 500 rpm C 1500 rpm D 1440 rpm

0 Answers  

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why our power production in multiples of 11.

2 Answers   ABB, Infosys,

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What is the type of earth fault protection used in battery? explain.

0 Answers   PSEB,

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Why transformer neutral earthing? What is advantages?

6 Answers  

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Which is the largest hydropower station in the world?

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What are the raitings of Mcb,mccb and Acb in detail ??

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impliment (AB)`+C to transistor representation

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How core saturation effects the secondary voltage (whats the theory) of a current transformer in service?

1 Answers  

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i seen a 132kv/11kv transformer,and thier is a sugar factorys 10MW EXPORT PLANT,MY QUESTION IS THAT WHEN THEY EXPORT ELECTRICITY THEY USE THE SAME TRANSFORMER AND THE CONNECT IT TO 132/11KV TRANSFORMERS SECONDARY SIDE CAN ANY ONE EXPLAIN IT.. THE TRANSFORMER IS OF KIRLOSKAR MAKE AND IT HAS TAP CHANGER.

1 Answers  

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why in three phase 440 circuit in all phase current is almost equal L1-35 A,L2-34 A ,L3-31 A but in nutral when i check with clamp meter it shows 25 A?

4 Answers   OPS,

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what is automatic voltage regulator and it is used?

2 Answers   HAL,

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why master trip(86) used in eletromagnet?

1 Answers  

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