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difference amongs PT,CVT,IVT

difference amongs PT,CVT,IVT

difference amongs PT,CVT,IVT

(OP)
HELLO ALL

MY QUESTION IS WHAT IS DIFFERENCE AMONGS PT, CVT AND IVT USED IN SWITCHYARD.CAN WE USE CVT INPLACE OF PT AND IVT,VISEVARSA.DEEPLY EXPLAINATION .

THANKS IN ADVANCE


RE: difference amongs PT,CVT,IVT

That looks to have been written by a really smart guy! :)

RE: difference amongs PT,CVT,IVT

I will take a guess that "IVT" is Current and Voltage Transformer (integrated in one unit).

RE: difference amongs PT,CVT,IVT

IVT normally stands for inductive voltage transformer...same thing as VT or PT.

RE: difference amongs PT,CVT,IVT

Further to the OP questions,the term "PT", (Potential Transformer) has been replaced by "VT", (Voltage Transformer), both being the same thing, an inductive (wire wound) device. I am not sure when this occurred, or in what standard.

As the attachment describes, there are some limitations to exchanging a VT with a CVT. The attachment describes a CCVT, which has the ability to couple a communications signal on the line, used primarily for distance relay station to station communications, although there are other applications, such as blocking and direct transfer trip, etc. A CVT is the same without the additional components required to couple a communications signal. As noted, one concern of using a CVT in place of a VT is the performance under fault conditions (transient response). Most modern digital/numerical distance relays have a function which, when enabled, can compensate for this.

RE: difference amongs PT,CVT,IVT

Scott- I agree that summary was written by a good engineer. I assume the fact that you probably had something to do with this document has no bearing on your opinion of the author?

RE: difference amongs PT,CVT,IVT

rcwilson...yes, I wrote it and therefore consider it top-notch :)

smallgeek...you're correct on the transient response issue. However, in actual practice, it rarely is an issue now, since the burden presented by electronic relays and meters is so low. Transient response performance improves as the burden is reduced. Also, as you mentioned, most relays can compensate for CVT transient response when set accordingly.

There is not uniformity in using CVT or CCVT. Most tend to use the terms interchangeably and use the term with or without "carrier accessories" to indicate if they can be used for power-line carrier coupling or not. BUt technically CCVT = coupling capacitor voltage transformer and CVT = capacitor voltage transformer. In reality, they are both the same devices, just carrier accessories include a drain coil, carrier ground switch, and choke coil.





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