GIS equipment contact fault detection method and system
A technology of contact failure and detection method, which is applied in the direction of electrical connection testing, measuring devices, instruments, etc., can solve problems such as poor contact, eccentricity, and normal operation of equipment on the silver-plated layer of contacts, and achieve the effect of solving the difficulty of implementing monitoring
Pending Publication Date: 2022-05-27
云南电网有限责任公司保山供电局
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Problems solved by technology
Disconnectors and circuit breakers in GIS often fail due to poor contact, which seriously affects the safe and stable operation of the power system
[0003] The evaluation of the electrical contact state of the GIS contact system is a multidisciplinary scientific problem in physics, materials, electromagnetics, heat transfer, etc. With the increase in the number of operations, the GIS contact system will have problems such as uneven contact and eccentricity of the contacts. Leading to poor contact of the silver-plated layer of the contact, the contact resistance will increase sharply, which will lead to severe heating of the switch, and even false tripping accidents
Traditional solutions mostly use power outage maintenance and detection methods, which affect the normal operation of the equipment
Method used
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[0042] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.
[0043] like figure 1 , figure 2 As shown, the present invention provides a GIS equipment contact fault detection method, comprising the following steps:
[0044] S1: Detect the normal contact resistance value under normal contact and the abnormal contact resistance value under different contact fault conditions through experiments;
[0045] S2: Use the 3D modeling software UG to establish a GIS multiphysics simulation model according to the physical model 1:1;
[0046] S3: Using a normal contact resistance value and multiple abnormal contact resistance values obtained in S1, combined with the GIS multiphysics simulation model, the resistance calculation formula and the Wiedemann-Franz law are used to calculate the normal contact resistance value and Each abnormal contact resistance value corresponds to the resistivity and thermal conductiv...
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The invention provides a GIS equipment contact fault detection method and system, and the method comprises the following steps: obtaining temperature field distribution corresponding to a GIS equipment housing under different current, contact fault and environment temperature conditions, and obtaining a plurality of groups of simulation data; the real-time shell temperature, the real-time surrounding environment temperature and the real-time current value of the GIS equipment are collected; judging whether the GIS has a contact fault or not according to the simulation data and actually-measured data of actual operation; according to the invention, the state of the GIS equipment contact system is reversely deduced by testing the temperature of the GIS equipment shell and combining the surrounding environment temperature and the relationship between the contact state of the GIS equipment contact and the current value, so that the problem of difficulty in monitoring the poor contact fault of the GIS equipment internal contact system in the prior art can be effectively solved; and the contact state of the contact system in the GIS equipment can be monitored and evaluated.
Description
technical field [0001] The invention belongs to the field of electric equipment, and in particular relates to a method and system for detecting contact faults of GIS equipment. Background technique [0002] Gas-insulated metal-enclosed switchgear GIS is an important equipment in the power system. It encloses circuit breakers, isolating switches, earthing switches, current and voltage transformers, arresters and connecting busbars in metal shells, which are filled with excellent arc extinguishing and A gaseous medium with insulating properties, acting as phase-to-phase and earth-to-ground insulation. The disconnectors and circuit breakers in GIS often fail due to poor contact, which seriously affects the safe and stable operation of the power system. [0003] The evaluation of the electrical contact state of the GIS contact system is a multidisciplinary scientific problem such as physics, materials, electromagnetism, and heat transfer. As a result, the silver-plated layer o...
Claims
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IPC IPC(8): G01R31/69G01D21/02
CPCG01R31/69G01D21/02Y02E60/00
Inventor 孙利雄苏阳李新洪刘娅玲李胜朋杨华昆邵宗官龙朝文张际明王瑞虎
Owner 云南电网有限责任公司保山供电局