Answer / sheik

to measuring in full load

Answer / bala

fully depends on the demand load in that power transformer
install area

Answer / suresh

by calculating the current carrying capacity and the voltage
withstand capacity of the insulation at the time of design
of any new transformer having any current or voltage rating

for previous 11 kv voltage rating the max current current
carrying capacity of wdg conductor at unity powerfactor
which represents KVA eauals voltage and current rating capacity

the eq is kva rating = va rating = V * I * cos @

at unity pf will be 1

Answer / thanigai1984

by measuring the capacity of transformer..

Answer / sanjay kumar behera

We know that the KVA rating of transformer always depends on the loss of that transformer.So for core loss calculation we can apply the open circuit test method as the core loss depends on voltage and for the calculation of copper loss we can apply the short circuit test method in which the copper loss depends on the current.

Answer / mekanjit boro

we use potential transformer

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4 Answers  

what is power factor

3 Answers  

I find that underground strip-armoiured,4core,LT PVC cables in an earthed power distribution sytem are occasionly found in charred condition-with no trace of it except ash. Is this because of no proper earth connection/continuity (giving rising to high armour resistance)in the joint enroute or because of insufficient capability (again due to high armour resistance)of cable-armour to carry fault current or due to neglected /unprotected overloading of the cable or due to high armour currents caused by power thefts where only phase(s) are unauthorisely tapped & at the point of poer consumption earth terminal is established by burring underground a not so good earthing rod (or using an underground water pipe for the purpose)

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i am swathi, b.tech 4th year. In smps(switched mode power supply)we are using diodes,mosfets,igbts for controling of current. And my question is why we did not use thyristors(scr)? it is also act as a switch,then what is the drawback of scr as compared to above transisters> if we use the scr,then what is happening ? plz give reply as soon as possible bcoz i am doing project on smps. plz frnds i want ans for that. if anybody know the ans plz send to my e-mail id /swathi.tadakapally@gmail.com/

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3 Answers  

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What is the relation of current with torque when motor started in Y-connection???

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What is the BS(British Standard)code for 11kv motor

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what is dielectric heating

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How to calculate cable rating for 3 phase supply?

0 Answers