Question

Differentiate between current transformer and potential transformer by seeing it?

Answer 1

Current Transformer:-

Current Transformer have only secondary winding marked with S1 & S2 with a Core,because our line conductor acts as as a primary winding itself.most of CT are windows type hollow core to pass the primary conductor through it like below image.



Some CT Come With a part of primary conductor it self,you have to just connect it with your bus bar in series like below image.



Potential Transformer:-

Potential transformer or voltage transformer gets used in electrical system for stepping down the system voltage to a safe value which can be fed to low ratings meters and relays.

In a potential Transformer you will always found Two winding, primary as well as secondary. like below image:-





Both have two winding marked with A,B,C as a Primary & a,b,c,n as a Secondary.In a Current Transformer you can found its Name plate have following details like,

CT Ration 100/1 or 100/5 A. while in PT you will found 6.6 K.V/110 V.CT Primary Marked with P1,P2 & Secondary S1,S2.

Thanks…….

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Tanumay Das, studied Electrical Engineering

Answered Jul 9, 2016

When you get a chance to visit a switchyard, you will find that there will be something from which wire will enter and leave, that one will be Current Transformer as it is connected in series with the line.

But for Potential Transformer, just wire will be connected to the PT terminals from the main line. Visit ETRICAL

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Hardik Bhesaniya, Electrical Engineer

Answered Jul 22, 2016

CT measures current and PT measures voltage as similar to ammeter and voltmeter.

Ammeter is always connected in series and voltmeter in parallel.

By visual inspection you can differentiate CT and PT as follow:

In CT there are two terminals on top i.e. one incomer and one out going.

In PT there is only one terminal, only incomer.

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Omar Luis Curetti, EEE

Answered Jul 10, 2016

The size mainly, power transformers are huge and the low voltage side have thick connectors while on potential transformers the low side current is quite low (just for instrumentation) then the connectors are small. At high voltage side the connections are also smaller in contact but the insulators are so big that might hide them.

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Omar Luis Curetti

I missunderestood the meaning of ¨current¨ and answer as if it is a ¨power¨ transformer (sorry), ...



Sanjay Hela, works at CESC Limited

Answered Jul 19, 2016

whatever may be the situation a current transformer will always be connected in series, and hence will have two primary terminals whereas a potential transformer will always be connected in parallel and hence it will have only one terminal which will be tapped off from the primary. Merely looking at the instrument and identifying the primary terminals one can identify a current or potential transformer

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Akash Raval, Electrical engineer about Electrical machine and power system

Answered Jul 10, 2016

The basic design of any measuring device is based on the which quantity u want to measure...for current u have to put ammeter in series wth the crck and for potential u have to put voltmeter in parallel to load or crkt....

So in switchyard there will be potential as well as current transformer...so to distinguish.. U have to jst simply follow the circuit which is come out from the generating xmer nd goes to switchyard...it will be following a manner like

Xmer --> lightning arrester--> isolator-->crkt breaker-->current transformer....nd so on...

So CT will be in series with the busbar

And for PT it will have simply construction which measure the potential with respect to ground...so one terminal will at crkt and another will be connected to ground....