A method for monitoring cable insulation status under the synergistic effect of multiple characteristic quantities

Abstract

The invention discloses a cable insulation state monitoring method under the synergy of multiple characteristic quantities. Specifically: collect the current at the beginning and end of the cable to obtain the leakage current of the cable; collect the voltage and current at the beginning and end of the cable respectively to obtain the dielectric loss factor of the cable; Aging factor; use the standard residual method to remove abnormal data from the obtained cable leakage current, dielectric loss factor and aging factor; and then judge whether there is insulation aging data in the data after removing abnormal data according to the cable insulation safety constraints; If it is determined that there is insulation aging data, use the cable leakage current, dielectric loss factor, and aging factor cluster center results and weights to determine the cable insulation aging level. The reliability of the obtained multi-indicator aging data and judgment results is guaranteed, and the judgment results of the cable aging grade are more comprehensive.

Description

technical field [0001] The invention belongs to the technical field of cable insulation state monitoring, and in particular relates to a method for monitoring the cable insulation state under the synergy of multiple characteristic quantities. Background technique [0002] Due to the requirements of space corridors and environmental protection, power cables have gradually replaced traditional overhead lines due to their good electrical and mechanical properties and are widely used in urban power grid construction. However, during long-term operation, the cable insulation material will age due to various factors, and its mechanical, thermal, and electrical properties will decline, threatening the safe and reliable operation of the power system. Therefore, understanding the insulation aging state of cables is of great significance to ensure the safe operation of equipment and even systems. [0003] In the power cable insulation aging detection technology, the existing methods ...

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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a cable insulation state monitoring method under the synergistic effect of multiple characteristic quantities, to solve the problem in the prior art that the aging index in the cable insulation state detection is single and the judgment result is one-sided and inaccurate, and the prior art The cable insulation aging state monitoring is susceptible to other signal interference, the monitored electrical signal is weak, the waveform is complex and changeable, and it is difficult to distinguish, and the monitoring results are easily affected by factors such as power frequency and high-order harmonics.

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