GIS partial discharge test method and system based on pulse current distribution measurement
A technology of pulse current and test method, applied in the direction of measuring electricity, measuring device, test circuit, etc., can solve the problem of the sensitivity of partial discharge identification of pulse current method, and achieve the improvement of partial discharge signal amplitude, signal-to-noise ratio, and good The effect of facilitating diagnosis and localization
Inactive Publication Date: 2020-11-27
武汉朗德电气有限公司
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Problems solved by technology
However, the frequent flashover faults of GIS insulators along the surface in recent years have raised doubts about the sensitivity of the pulse current method for partial discharge identification, especially for insulator surface defects, which are difficult to be detected by conventional pulse current methods
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[0029] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.
[0030] Such as figure 1 As shown, a GIS partial discharge test method based on pulse current distribution measurement includes the following steps,
[0031] Configure a reference unit for the test unit, and form a distributed measurement circuit with the test unit and the reference unit (the distributed measurement circuit is as follows: figure 2 shown); wherein, the capacitance of the equivalent capacitance C1 of the test unit matches the capacitance of the equivalent capacitance C2 of the reference unit (that is, the capacitance is equal or approximately equal); in the In the distributed measurement circuit, the test branch where the equivalent capacitance C1 is located is connected in parallel with the test bra...
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The invention relates to a GIS partial discharge test method and system based on pulse current distribution measurement. According to the method, a reference unit is configured for a sample unit, andthe sample unit and the reference unit form a distributed measurement circuit; and the capacitance value of an equivalent capacitor C1 of the sample unit is matched with the capacitance value of an equivalent capacitor C2 of the reference unit, and the capacitance value of a tool capacitor C0 is larger than 10 times of the capacitance value of the equivalent capacitor C1. According to a pulse current distribution measurement method provided by the invention, original pulse current partial discharge signal centralized measurement is changed into respective measurement of each test sample, the amplitude of the partial discharge signal is improved, the amplitude of the interference signal is reduced, and the signal-to-noise ratio is improved; and the partial discharge signals and the externalinterference signals are distinguished by comparing the amplitudes and directions of the partial discharge signals of the test samples, high-sensitivity measurement of the partial discharge signals of the pulse current method is further achieved, the sensitivity of an original partial discharge measurement method is improved, and diagnosis and positioning of GIS equipment faults are facilitated.
Description
technical field [0001] The invention relates to the technical field of GIS equipment partial discharge detection, in particular to a GIS partial discharge test method and system based on pulse current distribution measurement. Background technique [0002] Due to its excellent characteristics, gas insulated switchgear (GIS) is widely used in power systems. However, in recent years, surface flashover faults of GIS insulators have occurred frequently, seriously threatening the safety of power supply. The weak link of the insulation of GIS insulators will generate partial discharge under the action of high electric field. Partial discharge in the production process of insulators will affect the insulation performance of the product. Partial discharge in the process of equipment operation will lead to insulation degradation or even breakdown. Whether there is partial discharge is an important means to ensure the reliability of its operation. Among them, the pulse current metho...
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Login to View More IPC IPC(8): G01R31/12G01R31/14
CPCG01R31/1254G01R31/14
Inventor 陈勇王永君黄文雄袁佳歆郝乾朱勇誾山黄兴明
Owner 武汉朗德电气有限公司