1 Factors affecting the safe operation of high voltage switchgear 1.1 If the selection is not correct, the performance will not meet the requirements of the working place. The circuit breaker does have more comprehensive functions, but these functions are not available in various models and various categories, and some circuit breakers are cut, In the case of a no-load transmission line, it does not undergo heavy breakdown, so it does not cause a high overvoltage during operation, but may not be competent for another function; some circuit breakers are capable of breaking a large current. The arc-extinguishing performance is strong, but the interception phenomenon will occur when the small inductor current is broken. For example, some vacuum circuit breakers often damage the high-voltage motor when it is cut off. This is not caused by poor motor insulation. However, the over-voltage generated by the interception of the circuit breaker breaks down the insulation of the motor; some circuit breakers do not have the function of out-of-step and breaking, and are used at the generator outlet and the grid of the power grid. At the time of the circuit breaker, the reverse-breakdown of the fracture will occur. (In the 1970s, the salt-sand-sand 110KV contact breaker in Shonan Province experienced an arc-extinguishing chamber explosion when it was out of step.)...... 1.2 The quality of manufacturing and installation process cannot meet the requirements of product technical conditions. The material and performance of the circuit breaker are based on the requirements of the design; after the type test is determined, that is, the shaped product can not only be manufactured at the time of manufacture. Change the material, process and specified parameters, this should also be done during installation. Otherwise, it will be hidden for future use. 1.3 Maintenance is not timely, so that the product can not maintain normal work. Any type of switchgear has regular maintenance problems. If it is not maintained according to regulations, due to environmental influences, the wear of the product itself after long-term use will be The working performance is abnormal. For example, the high-pressure gas source of the compressed air circuit breaker and the pneumatic mechanism, the gas tank and its pipelines should be regularly drained, and the movable bearings of the transmission part should be regularly cleaned, injected with lubricants, etc. It is an indispensable link to ensure the long-term safe operation of the equipment, otherwise it will not guarantee safe and reliable use. 1.4 The purpose of restoring performance is not achieved after overhaul. The regular overhaul of the equipment, according to the requirements of the circuit breaker maintenance process required by the original Ministry of Water and Electricity, is to restore the original performance of the factory. Through inspection, not only the tolerance of each component The fit, wear and wear shall be within the specified range of technical conditions, and the mechanical dimensions, assembly process, parameter adjustment, etc. shall meet the technical standards. Otherwise, after the operation, there will be insulation damage, mechanical failure, or even the nameplate. Strict consequences of breaking faults. In the 1980s, the circuit breakers after maintenance in our province reached the standard after the insulation was completed, and all of them occurred after 110kV and 220kV. 1.5 Perfecting the product with problems and anti-accident measures are not timely. In the current production of circuit breakers and disconnectors in China, due to the lack of consideration in the original design, in the process of trial production and type test, the existing problems are exposed. Come out, and in use, by causing obstacles, accident analysis, summing up some parts can not adapt to the needs, combined with China's national conditions, it is impossible to completely eliminate these products, only on the basis of research, transformation, verification, After the finalization of the feasible transformation plan, the comprehensive improvement, such as the SNl0-10 series of large exhaust products produced in the 70s, the GW-220, which was adopted in the early 1980s, belongs to This kind of nature cannot be safely and reliably used if it is not completed in stages or in batches. 1.6 Operation does not comply with the technical regulations. No matter which type of circuit breaker, isolating switch, or complete electrical equipment, its performance, scope of use, and tasks that can be undertaken have certain technical principles, not omnipotent, but can not be violated. Its provisions operate, otherwise equipment damage will occur, even endangering the personal safety of the operator. When a certain substation is operated in a substation in our province, the main knife is not closed and the main knife is closed and locked by the mechanical locking device. However, the operator hardly cuts the locking device and performs the closing operation, which causes an accident with the grounding knife closing. Therefore, the operating personnel should follow the operation that is not allowed by the verification test and the working conditions that are not available. 2 Failure analysis must be correct The high-voltage switchgear has failed. From a technical point of view, the cause should be clarified first. Otherwise, preventive measures cannot be taken. However, in the accident analysis, the phenomenon that is often caused by some reason may occur from time to time. This phenomenon is unfavorable for preventing the recurrence of similar events in the future. It is summarized in the following attitudes and consequences. 2.1 Intentional concealment. Some units have a switch accident, they are not actively protecting the accident phenomenon and actively looking for the cause. Instead, they first take measures to hide the truth and clean up the scene, so that the investigators can’t see it. It is impossible to find out the cause, and it is impossible to find out the responsibility of the perpetrator. This practice is extremely bad. For example, some substations have caused the burnout of the high-voltage switchgear and its equipment due to misoperation, and it is also endangered. To the operating personnel, the traces have been destroyed after the accident, and some even came to the scene by the supervisor to help sell the traces of the accident. This practice must be eliminated. 2.2 Unclear reasons for rushing to send electricity. Although this practice is not intentional, it should also be taken seriously. For example: in recent years, l10kV. Substation 10kV distribution line outlet short circuit, and some caused high-voltage switchgear multiple damage, and some caused The circuit breaker explodes, some cause the conductor to melt, and some cause the busbar to support the insulator to break, and some cause the entire 10kV high-voltage room to burn. These serious accidents are whether there is a problem with the circuit breaker or the power supply protection operation equipment selection problem. If there is a problem with the operation mode, it is necessary to check the water and stone, in order to take preventive measures in a targeted manner. The substation 10kV distribution line exit (or near area), no one can guarantee that there will be no short-circuit accident, and no such accident can be caused. Expanded the scope. 2.3 Analysis of the accident did not identify the cause of the accident. The lokV indoor oil-less circuit breaker developed in the early 1970s, due to the inadequate design of the oil-gas separation structure, often caused a large amount of severely carbonized insulating oil to be discharged when the fault current was cut off, and a high voltage was formed. The arc in the cabinet is short-circuited, and some units have a high-voltage switchgear accident. They are all thoughtlessly attributed to the SNlo-l0 breaking fault, causing a short circuit and burning the equipment. Is the component of the high-voltage switchgear dirty? Or the insulation level is not enough, or for other reasons, so that the similar accidents can be replaced by circuit breakers. 2.4 Although the cause of the accident was found out, it was not thorough enough. The switchgear of #3, #4, #5, #6 in the 6kV power plant of Jinzhushan Power Plant is a good example. From 2004, these four 125MW Since the units were all put into operation, there have been too many accidents in the plant. By the fourth quarter of 1986, the provincial bureau organized a special investigation team to investigate the conclusions: Most of the accidents were caused by insulation damage, and the reasons were correct. More than 3 million yuan has been replaced with increased air clearance, but the insulation flashover accident still occurs from time to time. The new high-voltage switchgear that will be replaced in the artificial climate chamber by the provincial laboratory and the manufacturer has been inspected and thoroughly searched. All the problems existed, the transformation was carried out, and the environment was improved. The electricity accident at the Jinzhushan Power Plant was stopped. 3 Suggestions for ensuring the safe operation of switchgear 3.1 Focus on science, do a good job in product selection. The adaptation conditions of the circuit breaker are the conclusions that have been taken into consideration before the product development, and then the actual working conditions are verified. The selection of new or replacement products must be targeted. Use the actual requirements of the site; check the test report of the working condition verification, and prove that it has the required functions to be selected. When reviewing the test report, you must carefully and carefully prevent Zhang Guan Li Dai, such as the new level of vacuum circuit breakers, the interception level is very different The old product is about 20-40A. The new product with the best performance can reach the lowest level of l0A, and the overvoltage level generated during operation is also very different. 3.2 Carefully carry out the whole process management of equipment. From the selection, manufacturing quality, installation and acceptance, operation and maintenance, maintenance and other requirements, all the links must be serious. For the problems and products with great influence on the operation, there should be a purpose in the manufacturing process. Participate in the supervision and eliminate the congenital defects before the formal production. After the production, the maintenance and repairs are carried out regularly according to the regulations, so that the high-voltage switchgear can always maintain the performance under the technical conditions, and ensure reliable and flexible operation at any time. . 3.3 Face up to the problems left in manufacturing and installation, and actively take corrective measures. When manufacturing or installing, if problems are found, they should not be easily let go, and should not wait. Active measures should be taken, major problems, and even manufacturing. The factory conducts research, and can't wait for the accident to take measures. 3.4 It is imperative to correctly treat all abnormalities that occur during the operation of the switchgear. In terms of safety management, attention should be paid to operational analysis. First, unsafe signs should be caught. If abnormalities, obstacles, and accidents occur, the cause must be carefully and thoroughly identified. Prevent countermeasures. 3.5 Conscientiously implement and implement anti-accident technical measures. The anti-accident technical measures are summarized from the accident lessons of the past years. A large amount of tuition fees have been paid, and no accidents have occurred in the past. ≥1000Kva Diesel Generator ≥1000Kva Diesel Generator,Power Generator,Open Diesel Generator,Diesel Generator With Shanghai Engine Shanghai Kosta Electric Co., Ltd. , https://www.ksdgenerator.com