Equipotential mask capacitor type voltage transformer

Abstract

The invention relates to an equipotential mask capacitor type voltage transformer. The equipotential mask capacitor type voltage transformer comprises a capacitor voltage divider and an electromagnetic unit. The electromagnetic unit comprises a compensation electric reactor that is connected with the output end of the capacitor voltage divider, and an intermediate transformer whose primary winding is connected with the compensation electric reactor. The secondary winding of the intermediate transformer comprises a main secondary winding and a surplus winding. The surplus winding is connected in parallel with an iron magnetic resonance damper. In the equipotential mask capacitor type voltage transformer, the iron magnetic resonance damper is able to inhibit the overvoltage of iron magnetic resonance effectively, and is able to improve the transient response property of the iron magnetic resonance damper greatly.

Description

Technical field: [0001] The invention relates to a capacitive voltage transformer, in particular to an equipotential shielding capacitive voltage transformer. Background technique: [0002] In recent years, my country's AC UHV transmission technology has developed rapidly, which puts forward high requirements for accurate measurement of UHV grid voltage. At present, there are mainly three types of high voltage measuring devices: electromagnetic voltage transformer, capacitive voltage transformer and electronic voltage transformer. Electromagnetic voltage transformers are mostly used for voltage measurement of voltage levels below 110kV, and capacitive voltage transformers are generally used for voltage measurement of voltage levels above 110kV. The electronic voltage transformer is still in the research and development and testing stage, and its voltage measurement accuracy, laser life, system reliability and other issues need to be further studied and solved, and it has no...

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Problems solved by technology

The existing capacitive voltage transformers all adopt the ferromagnetic resonance damper with the energy storage element as the main functional element (at present, the fast saturated reactor type damper is widely used at home and abroad), although this type of damper has excellent suppression Ferroresonant overvoltage capability, but its transient response characteristics are generally poor, and it is difficult to meet the requirements of fast and accurate action of UHV power grid relay protection

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