The test performance of a built-in sensor depends on the conditions such as GIS structure and arrangement of sensors.If testing the built-in sensors via disassembly during operation of GIS is difficult

it is of great importance to test the installed built-in sensors in factory.In this study

an interval of ready-for-delivery GIS is taken as the test platform to establish a test system for the built-in sensors.Two methods of placing simulative partial discharge model in and injecting artificial voltage pulses into the GIS are adopted to test the sensors.Test data analysis indicates that: 1)for the two methods

the responses of the sensors attenuate with the increasing distances from the excitation sources to the sensors

and the signal attenuates more sharply after passing through the L-branch than spreading along the coaxial cylinder;2)for same sensor

its response increases along with the growing excitation signal;3)the response sensitivity of the built-in sensor depends on the excitation source

and the built-in sensor is more sensitive to voltage pulse signals.It is concluded that the delivery test of the built-in sensors is very important for verifying the reasonability of the number and arrangement of the sensors in the GIS design

and comparative analysis on the partial discharge data collected from the working GIS and the delivery test data can facilitate judgement of partial discharge defects.