Live detection method for power capacitive equipment

Abstract

A live detection method for power capacitive equipment comprises the following steps: detecting MOV by adopting a leakage current third harmonic compensation method to obtain the condition of MOV leakage current; calculating the correlation degree between the leakage current values measured under different environmental conditions and external environmental factors according to a grey correlationanalysis method; selecting various corresponding measurement data from a previous power failure detection database, processing the data through an intelligent diagnosis algorithm, and establishing a state evaluation data model; carrying out live detection for the leakage current; using a straight-through current transformer to obtain end screen current and lightning arrester grounding current of the capacitive equipment, and obtaining current characteristic information of the equipment through a numerical analysis and fault diagnosis algorithm; evaluating the state of the capacitive equipmentin the obtained state evaluation data model, and comparing the state with the data in the step 4 to form a comprehensive comparative analysis result. According to the method, the operation and maintenance management level of the capacitive equipment can be improved, and large-area power failure accidents can be effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of electric power detection, and relates to a live detection method for electric capacitive equipment. Background technique [0002] The capacitive equipment in the substation is the main electrical equipment in the power system. Its safe operation is related to the safety of the power grid and the quality of power. The safe operation of the capacitive equipment is of great significance to improve the economic and social benefits of enterprises. [0003] Capacitive equipment mainly includes arresters, transformers, high-voltage bushings, voltage transformers, current transformers, etc. With the rapid development of my country's medium and low-voltage power grids, capacitive equipment has been widely used more and more. During the long-term charged operation of capacitive equipment, due to the influence of various factors (environmental pollution, chemical corrosion, heating caused by various reasons, electro...

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Problems solved by technology

During the long-term charged operation of capacitive equipment, due to the influence of various factors (environmental pollution, chemical corrosion, heating caused by various reasons, electromotive force, mechanical force, etc.), its insulation performance will gradually weaken, which will cause insulation Breakdown, which can easily cause damage to equipment, and even cause large-scale power outages

At the same time, as a large number of capacitive equipment is put into operation, the probability of failure will continue to increase, which will seriously affect the quality of power supply for users and the safe operation of the power grid. Therefore, it is necessary to carry out research on the live detection method of capacitive equipment

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