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The paper makes use of the calculation results of ANSYS software, and establishes a model of corona at ultra high voltage transmission lines with Electromagnetic Transient Program (EMTP).The proposed model is applied to lightning calculation of the conductors. The simulation results indicate that the wave attenuation caused by corona takes an important place and it is significant to reduce the insulation level. Therefore this factor should be considered when determine the insulation coordination for the transmission lines so not as to increase the cost of the project.

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According to actual needs of the circuit breaker field measurement, by using induction coil as the basic principle of the proposed at both ends of the breaker is connected with the loop resistance test method. In this paper, we mainly study the circuit breakers at both ends of the ground state, circuit breaker loop resistance test design principle and theory model, solution method for the measurement of the small current signal criterion, research and development of the testing device, and through the two ends of the two devices on circuit breaker and GIS combination electric appliance grounding field test. Finally, to test this method and the traditional methods of test results were compared and analyzed, it is concluded that the two ends of the grounding circuit breaker loop resistance method can completely meet the needs of field maintenance and can improve the detection accuracy and instead of the traditional test methods.