Capacitor voltage transformer pdf en

In a capacitor voltage transformer system consisting of a capacitor chain and an electromagnetic transformer, an impedance network having a transfer function which is the inverse of the transfer function between the input and the output of the cvt under operating conditions is connected across the output of the electromagnetic transformer to obviate distortions produced in the output due to. Capacitor voltage transformer cvt or capacitor coupled voltage transformer ccvt is a switchgear device used to convert high transmission class voltage into easily measurable values, which are used for metering, protection, and control of high voltage systems additionally, a cvtccvt used as coupling capacitors for coupling highfrequency power line carrier signals to the transmission line. The capacitive voltage transformer cvt is also called capacitive potential transformer. In its most basic form, the device consists of three parts. Coupling capacitors are only used for coupling high frequency communication. The regulation of a constant voltage transformer can be designed to be better than a few percent. Capacitive voltage transformers isolate the measuring instruments, meters, relays, protections, etc.

The capacitive voltage transformer stepdown the high voltage input signals and provide the low voltage signals which can easily measure through the measuring instrument. They enable transmission of high frequency signals through the high voltage hv lines. If the constant voltage transformer is subjected to a line voltage frequency change the output voltage will vary, as shown in figure 115. Analysis and suppression of the coupling capacitor voltage transformer ferroresonance phenomenon article pdf available in ieee transactions on power delivery 244. Otcf capacitor voltage transformers capacitor stack the capacitor stack is a voltage divider which provides a reduced voltage at the intermediate voltage bushing for a given voltage applied at the primary terminal. Capability for handling a short circuit is an inherent feature of a constant voltage transformer. The capacitor stack is a multi capacitor unit assembly.