In view of such shortcomings as large error of traditional amplitude method and high hardware cost of TDOA method in UHF location of GIS partial discharge

an equivalent distance method is proposed to derive the location of partial discharge source by using the amplitude attenuation generated by the signal passing through the GIS component structure. Considering the influence of different measuring point layout and noise interference on location

the signal amplitude and waveform characteristics of 3-5 adjacent measuring points are compared firstly to determine the discharge interval

thus calculating the assembly of partial discharge source in accordance with the attenuation characteristic value. The corresponding software function modules are designed and integrated. The data acquisition and location verification experiments are carried out by using 252 kV GIS circuit breaker bay and GIL at the factory. The result shows that the equivalent distance method achieves 75% of the component level location accuracy and 95% of the sub-gas-compartment level location accuracy and takes into account the accuracy

economic performance and practicality

which is helpful to detect defects in time and reduce the scope of disassembly at the project site.