Answer / j.prakash

Transformer is static device there is no any rotating part
so there is no any friction losses, only iron loss and cu
loss in transformer, iron loss depend upon the voltage and
cu loss depend upon the current, there in no any loss which
depend upon power factor,so rating of transformer only in
kva.SO NOT IN KW..

Answer / narendra

the transformer rating in kva.the substaion step down or
step up the voltage the current will be constant

Answer / sunil bhuarya

above answer is correct if we talk about transformer, but as question is why s/s in kv....?? transmission capacity of incoming feeder is named as 400Kv, 220KV 132KV and so on...
for ex. in 220KV/132KV/33KV s/s there will be at least one /two 220Kv line and 132KV outgoing feeders that may be depend on the requirement..

Answer / k.prakashchandra

The structure and insulation levels of materials used are
designed on the basis of system voltage which remains unaltered.

How the power factor is more in high speed machines

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what is the lightning arrester rating for 3.3kv system voltage

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1.wat is the negative slip region in the motor?

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i m in need of current rating chart of heavy duty pvc/xlpe, cu/al cables. can somebody provide me? if yes, plz send me at ashish_patel111@yahoo.com

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I have 90KW Motor 60 Hz,380V Pf 0,88. after testing the Motor without Load is the no load Current 36 A,but wenn i put load after 2 hours the current increase more than 156 A. Can anybode tell me waht is the Problem?

4 Answers   ABB,

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Why we are going for converter transformers for DC drives application instead of distribution transformer?

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what is the difference between line & phase current in star delta connection motor?

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give me atleast four differences between circuit and network

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What is the Ohms low calculation

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MY QUATION IS ABT THE MAIN POWER TRANSFORMER IN STEEL PLANT , I WISH TO KNOW THAT WHY TRANSFORMER PROTECTION NOT TRIP AS CABLES ON THE SECONDAY SIDE IS WATER COOLED. TRANFORMER DETAIL NORMAL KVA--150 KVA PRIMARY VOLTAGE --34.5 KV SEC.NO-LOAD VOLTAGE---1.290-908-690V ( WITH PRIMARY DELTA CONNECTED) CONNECTION--D/d (EXTERNAL CLOSED) CONSTANT RATEING FROM--1.290-908V CONSTANT CURRENT FROM--908-690 VECTOR GROUP--D III

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If we need 4c× 50mm sq cable but it's not available so we can pull 4c×25mm sq two cables?

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From the point of view of accuracy in the Measurement of Electrical energy should we select a potential transformer or a capacitor voltage transformers?.Kindly support your reply with reason and justification.

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