A Capacitive Voltage Transformer (CVT) works by using a combination of capacitors and a transformer to step down high voltages to a lower, more manageable level for measurement and protection. Here’s a step-by-step explanation of how a CVT works: High Voltage Input: The Capacitive Voltage Transformer (CVT) is connected to a high-voltage power line.
High Voltage Input: The Capacitive Voltage Transformer (CVT) is connected to a high-voltage power line. The high voltage from this line is applied across a series of capacitors, which form a capacitive divider. Capacitive Divider: The capacitive divider consists of two or more capacitors connected in series.
Capacitive voltage transformers (CVTs) are used on higher voltage levels, starting from 66 kV and upwards. The type of the CVT is always a single-pole one, thus the connection is between phase and earth. The higher the voltage level is, the more price-competitive the capacitive type becomes.
There are several types of instrument transformers, but one of the most common on higher voltage transmission systems is the coupling capacitor voltage transformer (CCVT). CCVTs are devices capable of dual function.
Capacitive Voltage Transformers (CVTs) are essential in electrical power systems for several reasons. Firstly, they enable the safe and accurate measurement of high voltages. This is important for monitoring and managing electricity usage, as well as for billing purposes.
All capacitive voltage transformers require some sort of ferroresonance damping circuit. The capacitance in the voltage divider, in series with the inductance of the compensating reactor and the wound transformer (inside the electromagnetic unit EMU), constitutes a tuned resonance circuit.