Along with the development of ultra high voltage（UHV） transmission technology in China

transient enclosure voltage（TEV） generated in gas-insulated switchgear（GIS） may threaten the safety of staffs and secondary equipment

so accurate measurement of TEV is necessary. This paper develops a resistive impedance divider to measure the TEV in UHV GIS and the influences of structure and parameters to the square wave response of the divider are studied. The simulation and experiment result shows that

with grading sleeve installed on the high voltage side of resistor and increase of its length

the rise time of square wave response gradually decrease

but the overshoot will increase rapidly after the length of sleeve exceed a certain value. With shielding sleeve installed on the low voltage side of resistor

the rise time of square wave response increases signally due to the increase of capacitance to ground. In this paper

voltage rise time of the divider is about 3 ns

partial response time is 1.9 ns and overshoot is about 8.7%

experiments of the divider demonstrate that the electric insulating property

scale factor and square wave response of it satisfy the demand of TEV measurement in UHV GIS. This TEV measurement equipment has been used to carry out on-site TEV measurement in UHV AC test base

the measured results is stable.