The practice of the electrical equipment state overhaul

Abstract: the practice of electrical equipment state overhaul information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Equipment management is an important part of the electric power enterprise management, power supply equipment maintenance management, to health, operation of the equipment has enormous influence on the performance and reliability of power supply. Grid electric equipment has long been practice based on the time period. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the practice of the electrical equipment state overhaul the article details. Equipment management is an important part of the electric power enterprise management, power supply equipment maintenance management, to health, operation of the equipment has enormous influence on the performance and reliability of power supply. Grid electric equipment has long been practice on the basis of the time period of regular testing and maintenance system. Repair cycle are in accordance with the unified national regulations issued by the competent department in charge of provisions, overhaul project unified, unified maintenance interval and maintenance period. The traditional maintenance system, in the missile d etection of the past also did find the defect of the equipment and fault, and in a timely manner to eliminate, played a positive role. However, with the improvement of power supply technology and equipment level, the original has not meet the need of the operation of the existing equipment maintenance system, at the same time blindly maintenance has cost a lot of financial and material resources, brought about frequent stops, sending operation. Nanjing power supply company ( Hereinafter referred to as 'company') Currently has 500 kv substation 3, 220 kv substation 24 35 kv, 110 kv substation 78, 78 substations, the main transformer capacity of 15654 mv. A。 1395 sets of more than 35 kv circuit breaker; More than 35 kv overhead line, 4026. 3公里; More than 35 kv power cable, 710. 5公里; 10 kv overhead line, 10551. 5公里; 10 kv power cable, 1971. 6km。 These Numbers is growing at a rate of about 10% a year. Because enterprise is reduced to increase efficiency, the goal of zero growth is pressing for maintenance team to carry out the state overhaul, in order to achieve scientific use of funds, reasonable arrangement of manpower, increase the profit of the enterprise purpose. A every year, the state overhaul of equipment to test, maintenance and operation, as well as hundreds of thousands of days, but also exist error, or false to touch the electric equipment, falling, and the possibility of wrong operation. Equipment cleaning every year regularly test and transmission line will also spend a lot of manpower and money: 1 120000 kV of overhaul. A transformer need for human 300 man-days, cash 5 ~ 60000 yuan; Overhaul 1 220 kv switch have the 100 man-days, capital of 20000 yuan. Preventive maintenance equipment failure and defect can be seen and pilot test, but according to statistics, from 2001 to 2004, found that the main transformer faults and defects 267 times, including repair faults and defects discovered during pilot test 2 times, only accounted for 0. 75%; Circuit breaker failure and defect found 95 times, including repair faults and defects found during pilot test seven times, only 7. 4%. At the same time, the excessive maintenance can cause damage of equipment parts, reduce the service life of equipment. In recent years, the technology level of electrical equipment and health had the very big enhancement, the equipment failure rate decline year by year, the infrared diagnosis and online monitoring equipment has become increasingly rich and charged detection means. Using various means of effective monitoring, to improve maintenance management process, concretely according to the state of the equipment the positive research to develop different types of the state of the equipment maintenance strategy, reasonable arrangement of equipment maintenance plan, thus proposed the state overhaul. State overhaul according to the change of running status of equipment, through a variety of effective way to discover the equipment fault symptoms, the use of advanced diagnosis technology, mathematical statistics, the online monitoring method, quickly determine fault location and character, then determine the maintenance cycle of a maintenance system. But the state overhaul of equipment of high technology management requirements, have many years of accumulation of equipment operation, maintenance and test data, there should be more mature on-line monitoring device, to have a complete method of comprehensive analysis and diagnosis. Second, the equipment condition monitoring and maintenance of practice 2. 1 transformer [ 1] 2. 1. One of the main transformer condition monitoring ( 1) Trace gases in the insulating oil monitoring monitor trace gases in the insulating oil is monitoring of transformer and other electrical equipment status, the main measure of the insulation oil. Therefore, on the basis of the past conventional chromatographic analysis, introduction of early malfunction of transformer online monitoring device, the device is mainly used for monitoring the H2. For chromatographic analysis to detect fault is accompanied by H2 generation; Second, the device on CO, C2H2, C2H4 gas can also monitor, but slightly lower sensitivity. On-line transformer early fault monitoring device for timely grasp the change of trace gas in the transformer insulating oil has played a good role. （ 2) Measurement of partial discharge monitoring power transformer partial discharge, to supplement the shortage of gas analysis in oil. Partial discharge is organic material such as oil, paper insulation damage to one of the important reasons, thus by comparing partial discharge and its value to reflect the state of transformer insulation. （ 3) Measurements reflect mainly in order to diagnose the transformer winding deformation parameters after winding short-circuit current shock being serious state of technology, and then determine whether can continue to run. General with the cumulative effect of transformer winding deformation, namely the dynamic stability of the winding damage is usually after suffered several times or even dozens of short circuit current, winding deformation tester can provide information on winding deformation degree. Therefore, after each large short-circuit current hit the winding deformation measurement, and determine the corresponding countermeasures according to the results of the test, such as deformation obviously hanging core processing, etc. , can help to prevent the worsening.

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