XLPE cable insulation state evaluation method
A technology for cable insulation and state assessment, applied in neural learning methods, measurement of electricity, measurement of electrical variables, etc., can solve problems such as difficulty in accurately and comprehensively reflecting the state of cable insulation
Active Publication Date: 2021-09-10
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology
However, these methods often focus on the influence of a single variable, and it is difficult to accurately and comprehensively reflect the state of cable insulation.
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[0045] The present invention will be further described in detail below in conjunction with the accompanying drawings and through specific embodiments. The following embodiments are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.
[0046] refer to figure 1 , this application provides a method for evaluating the insulation state of XLPE cables, which is mainly aimed at the current diagnosis and evaluation of the overall cable insulation, mainly including DC current method, temperature measurement method, tan method and partial discharge method, etc., and these methods often focus on The influence of a single variable makes it difficult to accurately and comprehensively reflect the state of cable insulation. The methods include:
[0047] S10, using DCIC-q(t) technology to test the dynamic change parameters of the electric charge of the cable to be tested;
[0048] Among them, the dynamic change parameters of charge amount includ...
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The invention discloses an XLPE cable insulation state evaluation method which comprises the steps of testing charge quantity dynamic change parameters of a to-be-tested cable by adopting a DCIC-q (t) technology, extracting insulation medium conductivity of the to-be-tested cable according to the charge quantity dynamic change parameters, establishing a neural network model of dynamic charge parameter distribution, obtaining the insulation state of the to-be-tested cable, and establishing an XLPE cable insulation aging state evaluation model of a BP neural network and an FCM, and inputting the charge quantity dynamic change parameters into the XLPE cable insulation aging state evaluation model of the BP neural network and the FCM. State diagnosis and evaluation of the cable are an important technical means for ensuring safe and reliable power supply, and are also an extremely important part for realizing effective management of the cable in an intelligent power grid. According to the method, the dynamic change parameters of the electric charge quantity can be extracted, then insulation state classification and judgment are carried out through the fuzzy C-means clustering (FCM) method, and the provided evaluation model can improve the accuracy of cable insulation aging state evaluation.
Description
technical field [0001] The invention relates to the technical field of testing electrical properties, in particular to a method for evaluating the insulation state of an XLPE cable. Background technique [0002] Since entering the 21st century, my country's economic development has advanced by leaps and bounds. The power industry is one of the important pillars of economic development. With the rapid development of the national economy, people's living standards have greatly improved, but at the same time, the demand for the power market is also increasing , highlighting the contradiction between supply and demand of electricity shortage. [0003] In the process of urban civilization construction, people hope to create an elegant living environment and a relaxed living space. As a result, underground power cables have gradually replaced overhead lines. At the same time, with the increase in the number of cables and the extension of running time, cable failures have become mo...
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IPC IPC(8): G01R31/12G06N3/04G06N3/08G06F17/16
CPCG01R31/1272G06N3/08G06F17/16G06N3/045
Inventor 聂永杰王威望赵现平赵腾飞项恩新王科谭向宇肖华根
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST