Equipotential mask capacitor type voltage transformer

A technology of voltage transformer and capacitor voltage divider, applied in the direction of inductors, transformers, voltage/current isolation, etc., can solve the problems of difficult to meet the requirements of fast and accurate operation of ultra-high voltage, poor transient response characteristics, etc. The effect of improved dynamic response characteristics, light weight, and avoidance of eccentricity problems

Active Publication Date: 2015-06-03
STATE GRID CORP OF CHINA +2
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  • Description
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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 th

Method used

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  • Equipotential mask capacitor type voltage transformer
  • Equipotential mask capacitor type voltage transformer
  • Equipotential mask capacitor type voltage transformer

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Embodiment 1

[0033] Such as Figure 1-4 As shown, the inventive equipotential shielding capacitive voltage transformer of this example includes a capacitor voltage divider and an electromagnetic unit, and the electromagnetic unit includes a compensation reactor connected to the output terminal of the capacitor voltage divider and its primary winding and the The intermediate transformer T connected to the compensation reactor L; the compensation reactor L is connected in parallel with the voltage limiter S, and the secondary winding of the intermediate transformer includes the main secondary first winding 1a1n, the main secondary second winding 2a2n, the main secondary The third winding 3a3n and the remaining winding dadn; the remaining winding dadn is connected to the ferromagnetic resonance damper Z in parallel.

[0034] The main circuit of the ferromagnetic resonance damper Z includes a thyristor, a control circuit D1 and a damping resistor D2, the thyristor is turned on when ferromagnet...

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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...

Claims

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Application Information

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IPC IPC(8): H01F38/26H01F27/40H01F27/34G01R15/16
Inventor 査鲲鹏董巍郑健超杜晓峰陈自年
Owner STATE GRID CORP OF CHINA
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