Overview of On-line Monitoring of Substation Electrical Equipment Zhang Yuanlin\Wang Wensheng\Xu Dake2 (1.Nanjing Normal University, Nanjing 210042, China; Guodian Nanjing Automation Co., Ltd., Nanjing 210003, China) Includes basic concepts and principles of online monitoring, diagnostic methods, With experience, practicality and economy, it is pointed out that online monitoring is an inevitable means to achieve state maintenance of electrical equipment, with broad development prospects and huge social and economic benefits.
With the popularization of the state maintenance concept, the online monitoring technology of substation electrical equipment has become a research hotspot of high voltage technical workers at home and abroad. The development of modern science and technology is advancing by leaps and bounds. Based on computer technology and relying on the development of information, pattern recognition, neural networks, multimedia, new materials and other technologies, it has opened up new fields for online monitoring technology of substation electrical equipment.
1 Necessity At present, the testing work of electrical equipment in substations in China is still mainly based on the requirements of the (Procedures for Preventive Tests for Electrical Equipment), and the preventive tests are carried out regularly. According to the results of the tests, the operation status of the equipment is judged to determine whether it can continue. Put into operation. For a long time, adherence to preventive tests has played a significant role in the safe operation of China's power system, but with the expansion of power system capacity, high voltage and structural complexity, with the development and use of industrial and agricultural production The importance of the electrical sector has become more and more demanding on the safety and reliability indicators of the power system. This traditional test and diagnostic method has become increasingly unsuitable, mainly in the following: insulation degradation, defect development Although statistically, the speed of development is also fast, but most of them have a certain period of development. Various early signs show that there are a small number of gradual changes in the electrical, physical, and chemical properties of the equipment, and timely acquisition of various even weak information. After processing and comprehensive analysis, according to the value of the value and the trend of change, the device can be The reliability is judged at any time and the remaining life is predicted so that latent faults can be detected early, and early warnings or prescribed operations can be provided if necessary. The online monitoring technology is characterized by continuous or continuous monitoring of the electrical equipment under operating conditions. And judgment.
Due to the wide variety and variety of electrical equipment, online monitoring projects vary. According to the characteristics of the sensor and the characteristics of different equipment, the main items of online monitoring of electrical equipment in China are as shown in Table 1 Xing Ruli. Fast transient overvoltage in IS and its effect on the transformer. Transforming pressure. China Electric. in. Beijing: China Electric Power Press, Yan Yan. Electrical insulation online monitoring technology. Beijing: China Electric Power Press, 1995, Wang Naiqing. Practicality, economy and reliability of insulation online monitoring technology. Research and development work on electrified products.
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