Design And Field Test Of 3000kV/300kJ Gas Insulated Impulse Voltage Generator

With the comprehensive construction of extra-high voltage AC/DC project,the capacity of primary equipment is increasing,and the capacity and voltage grade of field test equipment are also increasing.It can not meet the requirements of the test only by using power frequency withstand voltage and partial discharge test.Extra-high voltage primary equipment needs to carry out field impulse test before it is put into operation,but the traditional impulse high voltage test device is difficult to transport,has high installation intensity,low efficiency,and its inherent inductance is large.It is difficult to meet the test requirement of large capacity primary equipment.In order to carry on the field impulse test to the large capacity device,this paper mainly have carried out the circuit design,the whole structure design and the field test research of the 3000kV/300 kJ gas insulated impulse voltage generator.The details are as follows:(1)In order to reduce the size and reduce the cost of transportation,3000kV/300 kJ gas insulated impulse voltage generator adopts one-sided and voltage-multiplying charging circuit,and the selection and design of key parameters are carried out.Through the circuit simulation analysis of the impulse voltage generator,the simulation results show that the design can meet the test requirements of different capacity loads and lays a foundation for the structure design of the gas insulation impulse voltage generator.(2)The traditional spark gap can not meet the basic requirements of the gas insulation impulse voltage generator,so the multi-stage spark gap was selected and its performance test was carried out.And then the whole structure of the gas insulated impulse voltage generator is designed.Through the electric field simulation analysis of the gas insulated impulse voltage generator,the rationality of the structure design is verified.In order to further increase the insulation margin,increasing the radius of curvature of the edge of metal connectors such as flange can make the electric field distribution more uniform.and the size of the designed gas insulation impulse voltage generator is about 37% smaller than the traditional one.(3)The impulse voltage generator has been tested on 1100 kV GIS at UHV AC test base.The test waveform meets the standard of DL/T 555-2004.The success of the test proves the rationality of the circuit design and structure design.In summary,the design of the impulse voltage generator and the field test have enriched the field impulse test technology of UHV,and provided an example for the research on the field standard lightning impulse test technology of UHV GIS.