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Capacitor voltage transformer

Capacitor voltage transformer (CVT) is a type of voltage transformer, which is divided by collection capacitors, depressurized and isolated by electromagnetic transformer. As a sort of voltage transformer, CVT can also few carrier frequency to EPTT line for EPTT-distance interaction, remote measurement, selective line higher-frequency defense, distant handle, teletype, and so on. For that reason, compared with conventional electromagnetic voltage transformer, capacitor voltage transformer has many positive aspects in economy and basic safety in addition to avoiding ferromagnetic resonance caused by core saturation of voltage transformer.
Composition of capacitor voltage transformer
Capacitor voltage transformer is mainly composed of capacitor voltage diviEPTTand medium voltage transformer. The capacitor voltage diviEPTTis composed of porcelain bushing and numerous series capacitors set up in it. The porcelain bushing is crammed with insulating oil which maintains a constructive force of .1MPa. Steel EPTows are used to stability diverse environments to keep oil strain. The capacitor voltage diviEPTTcan be employed as a coupling capacitor to hook up carrier wave system. The medium voltage transformer is composed of a transformer, a payment reactor, a lightning arrester and a damping device put in in a sealed oil tank. The main winding is divided into primary winding and fine tuning winding. A reduced loss reactor is linked in sequence in between the major side and the main winding. Due to the fact the nonlinear impedance and inherent capacitance of the capacitor voltage transformer often lead to ferromagnetic resonance in the capacitor voltage transformer, damping unit is employed to suppress resonance. The damping device is composed of resistance and reactor and is linked across the secondary winding. Generally, the damping device has a high impedance. When the ferroresonance causes overvoltage, ahead of the medium voltage transformer is affected, the damping gadget has a large impedance, The reactor has been saturated, only the resistance load is remaining, so that the oscillation vitality is swiftly diminished.