1.Hebei Electric Power Test Institute, Shijiezhuang 050021, China; 2. Fengfeng Power Generation Co., Ltd., Fengfeng, Hebei, 56215; 3. Yandian Electric Power Bureau, Langfang, Hebei, 56035 Special question, theoretically analyzed the valve distribution Water corrosion causes the circuit breaker to reject the ground and proposes measures. Key words circuit breaker; pneumatic mechanism; opening valve; water rust; rejection: AbstractThis tobreak classification number Ding touch 561.1 document identification code operation 1 = main change 2 switch, 2 switch phase rejection, after inspection 0 phase switch The venting hole of the gate valve seat is severely corroded, and there is no reaction with the throttle button. The emergency mining method measures the brake button and the phase is opened. After the manufacturer closes the switch, the switch is replaced. The following switch type 12201 rated current 31501 manufacturer Shenyang high-voltage switch factory 1 pneumatic mechanism characteristics compared with the hydraulic mechanism, the pneumatic mechanism mainly has the following characteristics 3. Eliminate the slow-scoring of the hydraulic mechanism, the majority of the pneumatic mechanism The use of a movable brake uses a spring, and the medium for the power transmission of the closing and closing is different, so that the slow opening action of the working cylinder piston together with the circuit breaker does not occur, that is, the slow division.
The micro-leakage of the surface after micro-leakage is avoided. It is an old question of the domestic switch. It does not affect the performance and use of the product, but it will cause the outside of the hydraulic mechanism to be dirty and affect the civilized production. The leakage of the pneumatic mechanism will not cause dirt outside the mechanism and will not pollute the environment. Since the gas is derived from the atmosphere, it is also economical to supplement.
Therefore, the accuracy of the addition of pneumatic components is not very high. The noise is louder.
2220, Pneumatic Mechanism of Circuit Breaker Introduction The pneumatic mechanism of 1220 Jia Circuit Breaker adopts phase separation and phase separation operation, which can make the circuit breaker perform manual separation operation, electric split operation, phase electric linkage, far and near control operation; Slow-and-slow operation is called no slow-moving mechanism. The circuit breaker is closed by the spring energy storage, the opening is pneumatic, the compressed air system is called together, the normal operation gas card is 1.51.6 coffee, the mechanism itself has no model 3 Qicun substation 22 type circuit breaker rejection analysis 3.1. The arrangement of the pneumatic mechanism of the Jia 220 Jia type circuit breaker in Qicun Substation is arranged in words, about 31 degrees apart, and the operating environment is basically the same. In the investigation of the refusal fault, it was found that there was a small amount of misty water vapor venting in the valve seat vent hole during the process of human, å–¾, and explanation. After removing the person and the phase gate valve, it was found that there were more rust powder in the gap between the valve seat and the cone valve, and the color of the occupant was iron pound color. The inspector, the rust condition of the final 7 valve seat, found that the corrosion is caused by the valve seat and the cone valve itself, the actual rust area is small; but the corrosion is serious, the valve seat and the cone valve rust are the direct cause of the rejection. It is understood that the 1st 220-rated circuit breaker has experienced the rusting of the opening valve in the Baobei substation in Beijing, Tianjin, Jiangsu and Hebei provinces, causing the circuit breaker to refuse to ask for the appearance of the micro-mist water vapor spray at the vent hole of the 8-phase opening valve. Corroded, and the action is normal, the trip is smooth.
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3.2.1 Material Analysis After learning from the manufacturing department, the valve seat and the cone valve of the valve are made of cast steel. At the time of the investigation, the valve seat and the cone valve were simply inspected with a sheet magnet. When the magnet is close to the valve seat and the cone valve, it can be sucked onto the valve seat and the cone valve. The material can not be completely non-magnetic and the performance is rather slim. 3.2.20 phase gate valve seat 4 trap water valve gap analysis of the water in the cone valve structure can be seen from the plastic cylinder and act as a valve port seal, when there is a small amount of leakage, if the gas tank The temperature differs greatly from the ambient temperature. For example, just after the pressure is applied, there is a cooling process of the compressed air at the leak point to cause the water vapor in the air to condense into water. It is inferred that people, sulphur and sulphur, and leakage at the plug may be caused by the accumulation of water in the gap between the valve seat of the valve and the valve of the valve. It is. In the winter, the following may also freeze the cone valve = 4 recommended measures for the pneumatic mechanism. 4.1 Manufacturing The manufacturing department should improve the machining accuracy of the key sealing parts of the pneumatic mechanism to prevent micro-leakage. In addition, it is necessary to completely solve the material of the valve of the opening valve; 4.2 Production aspect 4.2.1 Check the sealing condition of the piston in the opening valve. For the pneumatic mechanism of the circuit breaker of the boundary of the boundary of the boundary, it is necessary to strengthen the inspection of the sealing condition of the piston in the opening valve to prevent micro-leakage. Water. The inspection method can be carried out by filling a small amount of other gases such as 8 gas, and leaking the exhaust port of the opening valve. When the leak is found, the power should be checked. Qiao valve seat and cone valve. In order to avoid rust. Before the micro-leakage is eliminated, the corrosion should be cleaned up when the corrosion is found. Take some temporary measures. Such as turning on the heating device. Evaporate water at any time to prevent condensation.
4.2.2 Heating at low temperatures for pneumatic mechanisms. When winter is cold. The operating mechanism box must be warmed to prevent the water from freezing after the micro-leakage to freeze the cone valve, causing the breaker to be faulty. In addition, the gas storage tank and the pipeline drain valve must also be warmed. Prevent the valve from freezing and cracking. Ufa maintains pressure. Thereby extending the repair time.
4.2.3 Pay attention to the installation of the time-release water-pneumatic mechanism. It is stipulated in the instruction manual that the water should be placed once a week; in 1998, the Guiyang National Switch Conference high-voltage switch will be discussed in the discussion draft. Adhere to the water release system for pneumatic mechanisms. Because the morning is the lowest temperature in the middle of the day, it is easy to dew into water.
1 Xi'an Thermal Engineering Research Institute of the Ministry of Energy. Thermal Technology Manual Power Plant Metal. Beijing Water and Electric Power Press, 1989 2 Huang Huanzhen. Power plant thermal equipment. Water Resources and Electric Power Press, 1985 Received 1999
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