Cable partial discharge detection method and device
A cable partial discharge and detection device technology, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc., can solve problems such as grounding wire circulating current interference, and achieve the effect of eliminating interference and high accuracy
Pending Publication Date: 2021-12-31
SHANGHAI MUNICIPAL ELECTRIC POWER CO
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Problems solved by technology
Therefore, it is disturbed by the circulating current on the ground wire
Method used
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Embodiment 1
[0034] This embodiment provides a cable partial discharge detection method, including the following steps:
[0035] Data collection steps: set the first high-frequency current transformer 1 outside the inner core 5 of the cable to collect the high-frequency signal of the 7-core wire of the high-voltage cable; set the second high-frequency current transformer 2 outside the grounding cable 6 to collect the grounding signal. The high-frequency signal of the cable 6; the third high-frequency current transformer 3 is sleeved on the outside of the high-voltage cable 7 to collect the high-frequency signal of the high-voltage cable 7;
[0036] Partial discharge current detection step: Calculate the cable partial discharge signal according to the collected high-frequency signals of the high-voltage cable 7-core wire, the grounding cable 6 and the high-voltage cable 7. The calculation expression of the cable partial discharge signal is:
[0037]
[0038] In the formula, I is the cabl...
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The invention relates to a cable partial discharge detection method and device. The device is installed on a high-voltage cable and comprises a first high-frequency current transformer, a second high-frequency current transformer, a third high-frequency current transformer and a processor, wherein the first high-frequency current transformer sleeves a cable inner core, the second high-frequency current transformer sleeves a grounding cable, the third high-frequency current transformer sleeves the high-voltage cable; the processor is respectively connected with the first high-frequency current transformer, the second high-frequency current transformer and the third high-frequency current transformer, the processor comprises a summing circuit and a subtraction circuit, the input end of the summing circuit is respectively connected with the first high-frequency current transformer and the second high-frequency current transformer, and the input end of the subtraction circuit is connected with the output end of the summing circuit and the third high-frequency current transformer. Compared with the prior art, the method and the device can detect partial discharge signal of the high-voltage cable joint effectively, the accuracy is high, and interference caused by cable circulation can be eliminated.
Description
technical field [0001] The invention relates to the technical field of cable partial discharge detection, in particular to a cable partial discharge detection method and device. Background technique [0002] As the blood of the city, high-voltage cables provide the energy needed for urban life. Once the cable fails. The impact on urban life is immeasurable. The main fault location of the high-voltage circuit is the high-voltage cable joint. Doing a good job in the detection of high-voltage cable joints is the key point to ensure the stable operation of high-voltage cables. [0003] The partial discharge of high-voltage XLPE cables is the main factor causing high-voltage cable accidents, and has been widely concerned for many years. The reason is mainly due to the defects in the insulating parts of the cables, which generate partial micro discharges. The discharge process accelerates the deterioration of cable insulation performance, which eventually leads to cable break...
Claims
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Login to View More IPC IPC(8): G01R31/12G01R15/18G01R19/25G08C17/02
CPCG01R31/1272G01R15/18G01R19/25G08C17/02
Inventor 肖俊昱周韫捷杨洋叶志豪李海李红亮周宏周咏晨周晶晶陈艳羚陆乐邹翔宇管灏磬徐一旻
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO