输电线路绝缘子积污过程中因受到电场类型、外界环境及其结构特征的影响，绝缘子表面的绝缘性能不断下降并对电网的安全稳定运行造成潜在的风险。为研究输电线路污秽绝缘子放电特征，本文通过搭建输电线路污秽绝缘子放电试验平台，制作了典型污秽条件下的模拟污秽绝缘子试品，并在此基础上通过大量模拟试验研究了污秽绝缘子的放电过程。通过采用紫外成像、高速摄像机、以及高频电流监测终端获得了污秽绝缘子在不同阶段典型放电数据，并通过结果分析得到污秽绝缘子在各个发展阶段的放电呈现显著区别。研究得到不同阶段输电线路放电过程的特征参数，为电力运维人员采用联合手段监测输电线路绝缘子状态及其构建污秽放电数据库提供了参考。 Due to the influence of the type of electric field, the external environment and its structural char-acteristics on the pollution process of transmission line insulators, the insulation performance of insulator surfaces has been declining and it has caused potential risks for the safe and stable oper-ation of power grid. In order to study the discharge characteristics of polluted insulator in trans-mission line, the discharge test platform for contaminated insulator in transmission line is set up in this paper, and the simulated polluted insulator under typical polluted conditions is made. On this basis, the discharge process of contaminated insulator is studied through a large number of simu-lated tests. The typical discharge data of polluted insulator in different stages are obtained by using UV imaging, high-speed camera and high-frequency current monitoring terminal. The results show that the discharge of polluted insulator in different stages is significantly different. The character-istic parameters of different stages of transmission line discharge process are obtained, which pro-vides a reference for the power operation and maintenance personnel to monitor the state of transmission line insulators by joint means and build the contaminated discharge database of transmission line insulator.