At present,the rated voltage of the national measurement standard system only 700 kV,which can't meet the tracing demand of UHV apparatus above 3 500 kV.A structural analysis is conducted on the developed 1 200 kV resistive divider,and performance testing and improvement are carried out on the established 1 200 kV impulse voltage measurement system.Comparison and calibration are carried out with the existing 700 kV impulse voltage national standard measurement system within the voltage range of 700 kV,and linearity experiments are conducted in the voltage range of 700 kV to 1200 kV.The evaluation of uncertainty in the calibration of 1 200 kV standard impulse voltage measurement system is also introduced,the results show that the measurement errors of the test voltage(peak voltage),front time and time to half-value of the 1 200 kV lightning impulse voltage standard measuring system are all within the permissible range of the international standard IEC 60060 and the national standard GB/T 16927;the rated voltage level of the national standard measurement system of impulse voltage in our country is raised to 1 200 kV.
impulse voltage measurementUHV apparatusuncertainty evaluationmeasurement standardslightning impulsecomparative calibration
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