Answer / vino raju

it used for special protection.such as current check gaurd
relay, pilot wire protection relay..etc

Answer / ghani

It is defined by BS standards and now being included in IEC
as well. The accuracy limit factor in class X is defined by
manufacture with details of Knee point voltage limit, CT
resistance. So the X class mostly being used for
differential protection and also can be used for metering
purpose.

IN SINGLE PH TRANSFORMER IF LEKAGE IMPEDANCE DROP IS NEGLECTED ,THE FLUX IN THE MAGNETIC CORE and the lekage flux linking a winding are a)proportional to the applied v to the winding i respectively.

0 Answers  

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what is the procedure for cable sizing or on what basis we will calculate the size of cable?????

6 Answers   ANG, Focus, Mecon,

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what is meant by excitation which supply is used whether ac r dc in the lab applications

1 Answers  

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In power generator sets, when they are coverted from 50hz to 60hz, the kva rating after conversion increases. For example, the manufacturer of a perkins 200kva @ 50Hz generator set has mentioned it to become 220kva after converstion to 60hz. What is the relation between the frequency & the KVA rating. Any formula please.

3 Answers  

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15hp,380v,31amp,3-ph submersible motor run at 250v what is The temperature rise of submersible motor

1 Answers  

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pls give proper discription of selection of transformer based on particular load.

1 Answers  

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How to measure power in 2 or 4 or n phase circuit? Please give me a formula.

0 Answers  

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Is current shock due to voltage or current? pls answer

2 Answers   ABB,

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Short circuit voltage of a transformer mainly depend on A ohmic resistance of primary B ohmic resistance of secondary C magnitude of leakage flux D cross sectional area of core

1 Answers  

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1. If we apply dc supply to the primary winding of transformer it will be burnt out. similarly dc supply is given to field winding of syn. motor and armature winding of dc motor, they are safe. (Remember both windings inductive nature) what is the reason behind that?

2 Answers  

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Why the power factor of the alternator in power plant is kept .8 lagging. Can't we maintain it at 1.

3 Answers  

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how power is generated,and transmitted to our home..pls explain briefly in simple words.

0 Answers   HAL, Subros,

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