Answer Posted / rajkumar
Well a PT uses windings to drop voltage step down transformer high voltage to lower voltage just a transformer only !!! next CVT uses two capacitors in series to drop voltage or split ac like a filter circuit its a tuned 60 cycle resonant cap & coil circuit on primary side . and like a voltage divider circuit but uses capacitors . combined for protection relaying work fault trip zone portection function circuit its also for phase shift ,there really a coupling capacitor voltage splitter circuit centered tap to a reactor coil on primary side input of trans CCVT which is dropped to around 6kv pri input , the center tap of these series caps feed coil and coil feeds trans pri one cap is connected to ground one cap gos to hv line. But multi caps are used in series for the incoming hv line 165kv transmission line , not just two caps by example to make it simple and theres a iron choke coil called a reactor coil it cancels out the caps at 60 cycles for phase shift on output from primary to secondary of CVT transformer theres also a supression circuit on CVT secondary side thats what electricians call it but its just a old snubber circuit for discharge of a potential high voltage spike or back feed kick protection when a major fault occurs on hv transmision line voltage drops off sharply. But the whole circuit works in a delay of false tripping by capacitance stored energy in the caps to hold voltage on primary this controls the tripping time in seconds before a trip of deff relay coils circuits on secondary side which is 115 volts to supply differ relay coils as stated and to control all this with total CVT package circuit and must be included in explaining the difference of both PT and CVT
Is This Answer Correct ? | 3 Yes | 4 No |
Post New Answer View All Answers
Difference between a pilot wire and a normal conductor?
Percentage losses in power generation?
what happens to the supply voltage if there is any change in frequency?
How to measure the Harmonic Distortion of UPS ie THD?
How relay works, reverse relay, master relay, os relay, earth fault relay and what is its setting point
Earth has zero potential then what would be the neutral potential ?
Define ohm’s law for a.c (alternating current)?
xfhnchncv?
what is booster? and how it is connected in a circuit?
in electrical control panel. how can i choose the cable rating. (example - 11kw motor, 18-25A mpcb}
What do you mean by passive circuit elements and why these are called passive?
What must be the minimum distance maintained between 2 Generators as per International standards?
which type of stability limit is higher,steady state or transient? why?
Is it possible to obtain 480v or 550v in single phase output by giving the input to 230v to a single phase torodial type transformer without using a stepup transformer?
what is the meaning of number in (11, 31, 61,14, etc. CDG11, CDG31, CDG61, DDT32