Discussion on on-line detection of vacuum circuit breakers Yu Hongbo Ma Deming, Ma Hongning, and Su Xiaohong; The development trend and existing issues of the 29001 vacuum circuit breaker of the Public Power Bureau are not only oil-free equipment, but also the continuous breaking capacity Accumulation of small scenes 1 Frequent operation eliminates the need for low operating and maintenance of fires. It is ideal for unattended substations. At present, it has been developed and used in large quantities both at home and abroad, and it has a tendency to completely replace oil quenching media. At present, most of the substations have adopted multi-functional microcomputer electronic protection devices, and the degree of comprehensive automation has also increased. The requirements that tend to be unattended have basically been met. Therefore, the 7-inch main electrical equipment requires a fixed online detection self-test function, vacuum circuit breakers should not be an exception. The main faults of real circuit breakers are mainly two major mechanical faults. Because this type of failure rate is relatively small compared to the electrical failure rate, the chance of implementing on-line inspections still needs to be improved by the relevant departments in the method of constructing size combinations.
Electrical failure. This type of failure is a major threat to the immediate and stable operation of the grid, and its probability cannot be ignored. With regard to the sub-electrical faults and mechanical faults of vacuum circuit breakers, not only the faults are serious in nature, but also they have a large number of subtle randomness and are difficult to predict in time. Therefore, the manufacturer often reminds the user in the factory report to observe the arc interrupting physics of the vacuum interrupter. Therefore, such failures not only threaten the security of the Tuen Mun network, but also make it a seven-point requirement that can easily result in personal economic loss. 2 Before solving the on-line detection method of vacuum circuit breaker, there are many on-line detection methods for circuit breakers in the real world. Ordinary piezoelectric field induction method resistance - capacitive partial pressure method photoelectric remote sensing method
In addition, there is an on-line vacuum circuit breaker measurement method using the principle of Penning discharge electromagnetic wind.
Summarized, each has its own characteristics. Although they can also obtain the vacuum arc extinguishers in a specific case, and the voltage drop of the vacuum circuit breaker due to the leakage breaking can be reduced to nine. If you want to promote the use of noodles, you can discuss it later.
Looking at the method of artificial neutral point, the heart 8 uses high-voltage capacitors or high-value resistors to form an artificial neutral point. Although the whole body is called a road muscle against 1 inch or is formed by a high-voltage capacitor, the capacitive reactance is great. Under normal operating conditions, it does not have much impact on the entire system. The use of high-voltage potential and the reference for the grounding point of the kV to check whether the vacuum circuit breaker is in good condition has certain principles and characteristics. If this type of method is used in large quantities, and some vacuum circuit breakers are overhauled or faulted, they will appear as a virtual grounding point between the main system and the ground. Therefore, in the safety calculation and relay protection setting calculation, operation The network is free of bulky structures. Tensile and poor immunity. Low anti-vibration capability. Data is not easy to transmit and can only be effective on glass cases or vacuum circuit breakers that are easy to observe. When these methods are used to achieve universal and practical adoption, they must seriously consider the actual impact and feasibility.
In fact, the online detection of vacuum circuit breakers can also be achieved by other methods, and it is not very complicated. The interest in this lesson is to measure the vacuum change in the vacuum interrupter. Its main point is that the on-line detection device itself must not only have good electrical insulation capability and a small volume and reliable operational performance, but also have safety standards as far as possible. Reasonable use, convenient maintenance, and minimum cycle stability. In addition, it also has the dual functions of data transmission and local notification. The communication must also have the characteristics of standard transmission. It cannot be as different as relay protection.
To do a good job on the vacuum circuit breaker fire arc chamber online detection must comply with the current grid operating mechanism and feedback requirements, or willing to resolve the results can only solve a partial question and bring some unnecessary redundant work or burden.
3 The concrete method to achieve the realization of the method is to use mechanical sensors to change the optical transmission optical signal refraction angle and flux, in order to change the receiving end of the optical fiber transmission (4) through the subsequent processing circuit to discriminate between Ricoh, so as to achieve The purpose of online testing. The advantage of using this method is that it can well solve the insulation of high-voltage electrical appliances, and the detection sensitivity is not only practical but also relatively high.
There is a strong resistance to photoelectric radiation and vibration and environmental pollution.
Simple structure. The use of vacuum arc extinguishers is very convenient, basic, and wave repair.
Has the basic conditions for realizing local and remote monitoring.
Life-threatening basic and life-spanning fire arc chamber.
There is a pressure sensing element at the top or ground cover of the vacuum interrupter under the bellows elastic membrane or other elastic element. In its interior there is an auxiliary tension element to strongly detect the fatigue resistance of the device. An adjustment device and an information transmission element track constitute an information sensor on the top of the detector bore. Under normal conditions, the pressure detection component exhibits a highly compressed state under the effect of the external atmospheric pressure under a high vacuum state in the interior of the vacuum interrupter. When the vacuum interrupter leaks, the outside atmosphere enters, which will change the internal vacuum pressure of the vacuum interrupter, thereby forcing the pressure detection component to change its light source transmission interface; changing the exposure of the optical fiber 8 to the optical fiber.
The photoelectric converter 1 of the subsequent processing circuit 2 changes the output parameter of the operational amplifier as the transmission amount of the optical fiber 8 changes. Then the subsequent processing circuit reprocesses this parameter to finally achieve the purpose of alarm locking.
The feasibility of the method not only has the advantages of convenient material selection and reasonable overall electrical insulation capability, but also has a simple realization method and does not cause additional influence on the power grid due to the presence of the detection device even when the circuit breaker is in a serious accident. The reason why the method can be implemented is that the detection device made of special materials has a good free recovery degree and the measurement capability can reach 107.
The organic optical fiber has a good short-distance optical performance, and the body conversion characteristics have a linearity, the organic optical fiber has a good electrical insulation capacity, the average can reach each, above, the organic optical fiber in a short distance to send the signal does not Specially used for the photoelectric conversion of the spoon, the organic fiber's flexibility and anti-corrosion ability is relatively good, and it is more suitable for this project. Received 20021021 This column was edited and held in Ningbo. The statistical summary of the National Agricultural Power Annual Report was jointly entrusted by the State Electricity and Economic Commission to the National Electric Power Company's Agricultural Power Work Department and the Ministry of Water Resources' Rural Hydropower and Electrification Bureau. This meeting was similarly held by the two companies. The future power system work will be centralized by the CLP. Vice Minister Jia Fuqing of the State Grid Corporation of Rural Power and the Deputy Director of the Agricultural Power Xing Yijin of the Chili Ministry attended the meeting and spoke at the meeting. Director Zhao Mengxiang, General Affairs Department of the Agricultural and Tuen Work Department of the State Tuen Network Company presided over the meeting. Deputy Secretary-General Ma Dianmin of the China Rural Electric Power Branch was invited to attend the meeting. Also attending the meeting were Director Li Rufang, Ministry of Water Resources, Rural Power Bureau, Zhao Weiliang, deputy general manager of Zhejiang Electric Power Company, Director Gu Weimin, Deputy Director Chen Zhuying, Ningbo Electric Power Bureau, and Water Conservancy and Hydropower Bureau of various provincial and municipal electric power companies. Xinjiang Construction Corps Economic and Trade Commission Shaanxi Province Rural Electric Power Bureau Shanxi Province International Power Investment Corporation statistics workers. In his speech, Vice Minister Xing Yuanyue first affirmed the achievements made by agricultural statistics statisticians over the years and their role in the development of rural electrification. At the same time, he also introduced the key tasks of the Ministry of Water Resources in rural hydropower in 2003. Gasification is to set up the Xiaoshuitundi fuel environment project rural hydropower modernization, design, etc. In his speech, deputy director of goods Fuqing pointed out that to do a good job of rural power statistics work should have a high sense of historical responsibility, to provide the real call for the country's rural power planning and development of data is statistical data can be beneficial to the agricultural work statistics Really play a role. During the conference, the annual comprehensive report on rural electrification in 2002 and the annual report of Libya Power Industry were completed.
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