What is the major difference between P.T. & C.V.T ? Why CVT
is used in HT Transmission line in place of P.T.?
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Answer Posted / zeeshan
Well PTs and CVTs are both used primarily to measure voltage.
Primarily is used coz in CVT, we use it for another equally important aspect , i.e. to filter out the PLCC carrier wave.
AS regarding what's PLCC, thats a diff. concept altogether, and doesnt need a mention here.
PT and CVT both can be used both for 11KV and above lyns...but in practicality for 132KV and above....the transformer w/g of PT becomes highly bulky...and hence losses are more.
Whereas in CVT instead of the usual "Transformer w/g" we use as already said...capacitor series...thats performs two notable functions:
1) gives a low impedance path to PLCC carrier wave freq. which is of order of 100-500KHZ...and hence its used for protection and relaying and telemtering purposes
2) it is as already said...the voltage drops across each cap. and hence its viable to measure the voltage by using low coiled transformer...
So both PT and CVT can be used for any lyn...that be 11KV or 220KV....but as the line voltage increases...the losses in PT increases...and CVT provides that other extremely imprtant function. which PT totally lacks.
So in terms of economy and advancement CVT have been steadily replacing PTs as CVTs rank much higher in terms of efficiency , usability, and longevity
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