| With the rapid development in national economy, there is a growing need in electricity. In order to optimize the energy distribution across the country, to achieve the power transmission from west to east and north to south in a large-scale, and to realize North-South assistance in water and power, the power grid of million-volt-level AC and±800 kV UHV DC system should be accelerated to construct as the core of the national grid. A UHV AC demonstration project came into being. The project and the running experience are very little, and there is no international standard to carry out, so it is very important for the high voltage industry to study the l100kV SF6 circuit breakers of AC transmission systems. This work not only is the key science project for the UHV AC demonstration project, but also is the important task of the civil high voltage producing industry. In this paper, the combination of software and self-programming method was adopted; the electric field and flow field of high-voltage circuit breaker was calculated and analyzed. The test measurements of prototype model and the verification of product type test was accomplished after the high-voltage l100kV SF6 circuit breaker was successfully researched and developed relying on the first project of UHV AC demonstration project. And now it is running successfully in the world's first demonstration project of UHV AC.The circuit breaker developed in this paper is used in l100kVGIS, due to the large GIS-to-ground capacitance, small wave impedance and high-speed traveling waves, it is easy to produce high-frequency operation over-voltage, so in this article the l100kV SF6 circuit breaker is designed with the open and close resistor. The configuration of the resistor is optimized well. Every part of the extinguishinger was packaged within the metal shell, and the open and close resister successfully controls operation over-voltage, which is a big progress. In this paper a three-dimensional mathematical model of the electric field of l100kV SF6 circuit breaker was established. On the other band, the structure of extinguishinger of the circuit breaker with open and close resistor is optimized, and the effect of lightning impulse voltage on insulation of extinguishinger with open and close shared resistor was analyzed. Thus, a reasonable structure of the extinguishinger was determined. Moreover, the three-dimensional electric field of the main fracture as well as resistor fracture was calculated. Results show that the extinguishinger insulation is good. And it has sufficient insulation performance, and it has been verified by insulation test.In the paper, combining the UHV GIS running condition, breaking the traditional design which is the moving parts moving and the immobile parts is rest, Basing on the moving parts and immobile parts moving synchronously principle, the new constructure is designed which is the moving parts and immobile parts moving synchronously. Such constructure fulfill the performance. Then the absolute velocity is increased and the operation power is lessened, and decreased the demand of the operation, it ensures the circuit breaker's mechanism and electric performance.A mathematical simulation model of arc chamber gas flow field of a circuit breaker during breaking was established, according to gas mass, momentum and energy conservation law. The complex flow problems and its variants Field were solved using moving grid technology and commercial software and self-programming. Then solve the established mathematical model. Multi-point measurement of airflow field was taken on the model of extinguishinger under the condition of no-load and load. The effect of the breaking current and the key structural parameters on the characteristics of interior gas pressure in compressor was compared. After verifying the applicability of this simulation method, the calculation and detailed analysis were carried out on the airflow field under the conditions of load and off-load of l100kV SF6 high voltage circuit breaker based on the application of the method. Theoretical system and method of optimal design of arc chamber was made on the combination of experiments and computer simulation.Based on this theory, a prototype of l100kV SF6 high voltage circuit breaker was developed and successfully passed all the type tests at the national high-voltage electrical appliances Quality Supervision and Inspection Center in June 2008, all test parameters are the highest level of technology in the world. The success of these trials is under the guidance of this theoretical analysis and test results, the analysis method not only can be applied to the research and development of ultra high voltage products, but also can be applied to the development of other voltage levels of the circuit breaker.
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