Practice of Condition Maintenance of Electrical Equipment

Abstract: The practical information of condition maintenance of electrical equipment is provided by excellent flowmeter and flowmeter manufacturers. Equipment management is an important part of power enterprise management. The quality of power supply equipment maintenance management has a great impact on equipment health, operating performance and power supply reliability. Grid electrical equipment has long been practiced on a time cycle basis. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the practical articles on the condition maintenance of electrical equipment. Equipment management is an important part of power enterprise management. The quality of power supply equipment maintenance management has a great impact on equipment health, operating performance and power supply reliability. The electrical equipment of the power grid has been implementing the periodic test and maintenance system based on the time period for a long time. The maintenance cycle is carried out in accordance with the national unified regulations issued by the competent department, and the maintenance items are unified, the maintenance interval is unified, and the maintenance period is unified. This traditional maintenance system has indeed found equipment defects and faults in the past regular inspections and eliminated them in time, which has played a positive role. However, with the improvement of power supply technology and equipment level, the original maintenance system is no longer suitable for the operation needs of existing equipment. At the same time, blind maintenance also consumes a lot of financial and material resources, resulting in frequent shutdown and power transmission operations. . Nanjing Power Supply Company (hereinafter referred to as the company) currently has 3 500kV substations, 24 220kV substations, 78 110kV substations, and 78 35kV substations, with a main transformer capacity of 15654MV.A. 35kV and above circuit breakers 1395; 35kV and above overhead lines 4026.3km; 35kV and above power cables 710.5km; 10kV overhead lines 10551.5km; 10kV power cables 1971.6km. These numbers are still growing at a rate of around 10% every year. Due to the reduction of personnel and efficiency of the enterprise, the goal of zero growth of the maintenance team urgently requires the development of condition maintenance, in order to achieve the purpose of scientifically using funds, rationally arranging manpower, and increasing enterprise benefits. 1. Proposition of Condition Maintenance It takes hundreds of thousands of man-days to test, overhaul and operate the company's equipment every year, and there is also the possibility of mistakenly logging in or accidentally touching live equipment, falling from high altitude and misoperation. Regular testing of equipment and cleaning of transmission lines also require a lot of manpower and capital every year: overhauling a 120,000 kV.A transformer requires 300 man-days and a capital of 50,000 to 60,000 yuan; overhauling a 220kV switch requires manpower 100 working days, capital 20,000 yuan. Regular maintenance and pre-test can find equipment faults and defects, but according to statistics: From 2001 to 2004, 267 main transformer faults and defects were found, of which 2 faults and defects were found in the pre-test of maintenance, accounting for only 0.75%; There were 95 faults and defects in the equipment, of which 7 faults and defects were found in the pre-test of maintenance, accounting for only 7.4%. At the same time, excessive maintenance will also cause damage to equipment components and reduce the service life of the equipment. In recent years, the technical level and health status of electrical equipment have been greatly improved, the equipment failure rate has decreased year by year, and the infrared diagnosis, online monitoring and live detection methods of equipment have become increasingly abundant. Using various effective monitoring methods, improving the maintenance management process, actively researching and formulating condition maintenance strategies for different types of equipment according to the status of the equipment, and rationally arranging equipment maintenance plans. Therefore, the subject of condition maintenance is proposed. Condition-based maintenance is based on the change of the operating state of the equipment, through various effective ways to timely find the symptoms of equipment failure, using advanced diagnostic technology, mathematical statistics, online monitoring and other methods to quickly determine the fault location and nature, and then determine a maintenance cycle. maintenance system. However, condition maintenance has high requirements on the technical management of equipment. It must have many years of equipment operation, maintenance and test data accumulation, a relatively mature online monitoring device, and a complete set of comprehensive analysis and diagnosis methods. 2. The practice of equipment condition monitoring and maintenance main means. To this end, on the basis of conventional chromatographic analysis in the past, an on-line transformer early fault monitoring device is introduced, which is mainly used to monitor H2. Because the faults that can be detected by chromatographic analysis are accompanied by the generation of H2; secondly, the device can also monitor the three gases of CO, C2H2, and C2H4, but the sensitivity is slightly lower. The online transformer early fault monitoring device plays a very good role in grasping the change of trace gas in the transformer insulating oil in time. (2) Measure the partial discharge amount and monitor the partial discharge of the transformer on site to supplement the deficiency of the gas in oil analysis method. Partial discharge is an important reason for the damage of organic materials such as oil and paper insulation. Therefore, the information of the insulation state of the transformer can be reflected by comparing the partial discharge with its value. 》

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