As the power system continues to improve the requirements for high reliability, less maintenance, miniaturization and environmental protection of electrical equipment, the product design of ultra-high voltage circuit breakers has been upgraded to a modernization based on theoretical analysis, computer-aided calculation, and experimental research for verification. At the level of modernization, GIS bushing electromagnetic field simulation analysis is carried out. The research results are conducive to improving product reliability, optimizing product structure, and improving product production process level. At the same time, it can also reduce the impact of the electromagnetic field of ultra-high voltage circuit breakers on ecological and environmental effects, rationally arrange the work site of power equipment, reduce the harm of electromagnetic waves to the human body, and achieve the purpose of safety and environmental protection.

According to the technical requirements of ultra-high voltage circuit breaker products, based on the preliminary design structure of the circuit breaker outgoing bushing, on the premise of meeting the product technical conditions and engineering requirements, the finite element method is used to calculate the electric field inside and outside the 126kV(or 252 kV) circuit breaker porcelain bushing respectively. The distribution, and the structure of the grounded internal shield is optimized to achieve the role of uniform electric field.

Innovation points:

By comparing SF₆Calculate and analyze the electric field distribution of the circuit breaker outgoing bushing, determine the insulation size of the porcelain sleeve, optimize the electric field distribution of the bushing, and make the voltage distribution along the bushing uniform.

For the first time, a study was conducted on the impact of electromagnetic fields of ultra-high voltage circuit breakers on ecological and environmental effects, in compliance with the policies of clean energy and environmental protection advocated by the country.

Benefit:

According to statistics, my country's SF above 110kV₆The annual output of circuit breakers is about 3000 units, and each unit will be equipped with 3 insulating sleeves. Therefore, the annual demand for insulating sleeves is about 9000 units. Based on the cost savings of 1000 yuan per set, the cost will be reduced by 9 million yuan per year.

According to reports, during the "Eleventh Five-Year Plan" period, 36,000 kilometers of AC lines of 30kV and above were built nationwide, with a substation capacity of 1.8 billion kVA, with an average of 7000 kilometers and 36 million kVA added every year. By 2010, the number of AC lines of 330kV and above will reach 120,000 kilometers, and the substation capacity will reach 480 million kVA. During the "Eleventh Five-Year Plan" period, the investment scale of power transmission and transformation projects of 330kV and above is about 160 billion yuan, including 140 billion yuan for AC projects and 20 billion yuan for DC projects. The market development situation of high-voltage switchgear is: high-voltage SF₆The development momentum is good and the growth is stable, while GIS products are growing at multiple speeds, especially the development of 252kV GIS is obvious.

Results:

[1] Jin Lijun，Peng Chenyi, Jiang Tao， System-level electric field exposure assessment by the fault tree analysis，IEEE Transactions on Electromagnetic Compatibility，2017,，59(4)：1095~1102. (Collected by SCI)

[2] Lijun J, Chenyi P, Yingyao Z，Assessment of Electric Field Exposure Using Reliability Analysis[J]，IEEE Trans. Power Delivery, 2016，31(4): 1510-1516. (Collected by SCI)

[6] Tian Z, Jin L, Peng C, et al. Discrimination of transmission line insulator contamination grades using visible light images[C]//Environment and Electrical Engineering (EEEIC), 2016 IEEE 16th International Conference on. IEEE, 2016: 1-5. (wos：000387085800010)EI:20163902844747. (Included in EI)

[7] Peng C, Jin L,Tian Z. Layout optimization of framework insubstation inview of electromagnetic environment [C] Environment and Electrical Engineering (EEEIC), 2016 IEEE 16^th International Conference on. IEEE, 2016: 1-6. (wos:000387085800004)EI: 20163902844741. (Included in EI)