Cable intermediate joint insulation state evaluation method, system and device
A technology of cable intermediate joints and insulation state, which is applied in the direction of testing dielectric strength, etc., can solve the problem of low accuracy and achieve the effect of improving accuracy
Pending Publication Date: 2022-03-29
GUANGDONG POWER GRID CO LTD +1
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Problems solved by technology
[0005] The invention provides a method, system and device for evaluating the insulation state of cable intermediate joints, which solves the technical problem that the accuracy of the existing evaluation method for the insulation state of cable intermediate joints is not high
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Embodiment Construction
[0080] Embodiments of the present invention provide a method, system and device for evaluating the insulation state of a cable intermediate joint, which are used to solve the technical problem of low accuracy of the existing method for evaluating the insulation state of a cable intermediate joint.
[0081] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the following The described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0082] see figure 1 , figure 1 A flo...
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The invention relates to the technical field of power equipment monitoring, and discloses a cable intermediate joint insulation state evaluation method, system and device. The method comprises the following steps of: selecting a partial discharge signal of a cable intermediate joint to extract a feature vector, taking the feature vector as an evaluation index, determining a constant weight of each evaluation index by utilizing an analytic hierarchy process, correcting the constant weight according to the deterioration degree of the evaluation index, and further determining the partial discharge of the cable intermediate joint according to the corrected weight and a subsequently established membership degree function. Obtaining an insulation state evaluation result of the cable intermediate joint by using a fuzzy comprehensive evaluation method; according to the method, the measurement index of the deterioration degree is provided, the deterioration degree is used for representing the damage degree of the evaluation index to the insulation state of the cable intermediate joint when the evaluation index approaches the corresponding fault value, and the constant weight obtained by using the analytic hierarchy process is corrected through the deterioration degree, so that the weight of the index better conforms to the reality; and the accuracy of evaluating the insulation state of the cable intermediate joint is improved.
Description
technical field [0001] The invention relates to the technical field of power equipment monitoring, in particular to a method, system and device for evaluating the insulation state of an intermediate joint of a cable. Background technique [0002] The intermediate cable joint is manufactured and laid on site, the construction quality is difficult to guarantee, and its structure is complex, and the internal electric field distribution is uneven. These factors are likely to cause the local electric field strength of the intermediate cable joint to be too high, resulting in partial discharge, accelerated insulation aging, and joint strike. wear fault. [0003] In terms of time, various breakdown faults at the intermediate joints of cables are a gradual process, and are generally accompanied by partial discharge. When the partial discharge phenomenon first occurs, the damage to the insulation is very weak, but with the accumulation of time and the continuation of this damage, th...
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IPC IPC(8): G01R31/12
CPCG01R31/12
Inventor 刘益军梁年柏欧晓妹李国伟陈鹏张殷刘少辉吴焯军罗容波黄静刘昊邱浩荣
Owner GUANGDONG POWER GRID CO LTD