An internal contact capacitive voltage divider for gis

Abstract

The application discloses an internal contact capacitive voltage divider for GIS, comprising: a high-voltage arm assembly, a metal connection assembly and a low-voltage arm assembly, the high-voltage arm assembly and the low-voltage arm assembly are connected through the metal connection assembly. The high-voltage arm assembly includes a post insulator housing and a high-voltage capacitor unit. The post insulator housing can meet the insulation requirements of the GIS. The shape of the post insulator housing matches the post insulator. The metal insert of the high-voltage capacitor unit is provided with protrusions, which effectively reduces the synthetic field strength along the high-voltage side of the insulating shell. The low-voltage arm assembly includes a metal low-voltage arm shell and a low-voltage arm unit. The low-voltage arm unit includes an impedance converter. The impedance converter expands the lower limit frequency of the capacitor voltage divider, and can measure various voltage forms such as lightning impact, operating impact, and power frequency voltage. . The internal contact capacitive voltage divider for GIS provided by the application has the advantages of simple structure, high measurement accuracy, good stability and wide measurement frequency range.

Description

Technical field [0001] The present application relates to the field of power systems, and more particularly to an inner contact capacitive voltage divider for GIS. Background technique [0002] GIS (i.e., gas insulated metal closed switch equipment) is widely used in the power system, but it is susceptible to a threat of multiple overvoltage, such as lightning overvoltage, operating overvoltage, etc., therefore needs to perform corresponding factory tests and live tests. Some voltage generators use the docking mode (docked into non-contact and contact formulations) to perform routine experiments for GIS, so it is necessary to measure the amplitude waveform of the applied voltage using the GIS built-in voltage divider. [0003] Since the insulation design of the GIS is extremely high, in order to ensure the insulation reliability, the voltage divider typically uses a non-contact capacitive voltage divider, which utilizes the distribution capacitor between the GIS bus and the volta...

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Problems solved by technology

[0003] Due to the extremely high insulation design requirements inside the GIS, in order to ensure reliable insulation, the voltage divider usually uses a non-contact capacitive voltage divider, that is, the distributed capacitance between the GIS bus and the voltage divider shell is used as the high-voltage arm, but the dynamics of the distributed capacitance Unstable characteristics, so the measurement frequency band is narrow, which is not conducive to the measurement of various types of voltage

[0004] The contact capacitive voltage divider has the advantage of stable dynamic characteristics, but it will distort the electric field inside the GIS, which will reduce the insulation strength of the GIS, and the low frequency response of the capacitive voltage divider is poor

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