Comparative Research of Laboratory and Field Infrared test of 500kV Transmission Line Composite Insulator

In response to a batch of composite insulator temperature rise of a 500kV transmission line, field infrared test were conducted and 17 typical composite insulator with temperature rise were tested in laboratory. The temperature rise value with test time were grasped and internal defect were confirmed by anatomy. Comparing the results of laboratory and field test, the on-site tower test defect judgement accuracy were obtained. It is indicated that the on-site tower test defect judgement accuracy based on V string composite insulator with temperature rise is 46.15%. The temperature rise of poor adhesion and initial stage decay in laboratory could be little. The temperature rise of rod with internal defect stay increasing within the 30 min laboratory test time. It is recommended that the laboratory infrared test accuracy could be promoted by increasing applied voltage time and concerning rod temperature change curve. For field infrared test, the test method combined with drone to reduce the obstruction of insulator rod, and with rod temperature distribution characteristic to reduce the interference of visible light is recommend.