	US 12,247,971 B2
	Method and device for evaluating aging state of silicone rubber composite insulator
Boyan Jia, Hebei (CN); Jie Liu, Hebei (CN); Yanwei Xia, Hebei (CN); Xianhai Pang, Hebei (CN); Yuhao Zhao, Hebei (CN); Shilin Li, Hebei (CN); Liqiang Song, Hebei (CN); and Xiangxia Liu, Shandong (CN)
Assigned to State Grid Hebei Electric Power Co., Ltd. Research Institute, Shijiazhuang (CN); State Grid Corporation of China, Beijing (CN); State Grid Hebei Energy Technology Service Co., Ltd., Shijiazhuang (CN); HEBEI SILICON VALLEY CHEMICAL CO., LTD., Handan (CN); and ZIBO QIANHENG AUTOMATION ENGINEERING CO., LTD., Zibo (CN)
Appl. No. 17/789,534
Filed by State Grid Hebei Electric Power Co., Ltd. Research Institute, Hebei (CN); State Grid Corporation of China, Beijing (CN); State Grid Hebei Energy Technology Service Co., Ltd., Hebei (CN); HEBEI SILICON VALLEY CHEMICAL CO., LTD., Hebei (CN); and ZIBO QIANHENG AUTOMATION ENGINEERING CO., LTD., Shandong (CN)
PCT Filed Dec. 10, 2021, PCT No. PCT/CN2021/137084 § 371(c)(1), (2) Date Jun. 28, 2022, PCT Pub. No. WO2023/102893, PCT Pub. Date Jun. 15, 2023.
Claims priority of application No. 202111493264.1 (CN), filed on Dec. 8, 2021.
Prior Publication US 2024/0192191 A1, Jun. 13, 2024
Int. Cl. G01N 17/00 (2006.01); G01N 3/20 (2006.01); G01N 3/40 (2006.01); G01N 21/31 (2006.01); G01N 33/44 (2006.01)

CPC G01N 33/445 (2013.01) [G01N 3/20 (2013.01); G01N 3/40 (2013.01); G01N 21/31 (2013.01)]

18 Claims

1. A method for evaluating an aging state of a silicone rubber composite insulator, comprising the following steps:

step 1: collecting samples from the silicone rubber composite insulator, subjecting samples in a surface layer successively to hydrophobicity, flexing resistance, hardness, color, and absorbance tests, and subjecting samples in a center layer successively to hardness, color, and absorbance tests;

step 2: determining an average static contact angle, a flexing resistance index, a hardness difference, a color difference, and an absorbance rise rate of the samples during a natural evolution process according to the tests in step 1;

step 3: subjecting the samples to thermo-oxidative aging; and after the thermo-oxidative aging is completed, subjecting the samples to a hardness test of artificial accelerated evolution, and calculating position coordinates (F₁, F₂) of the samples in an aging space; and

step 4: classifying the samples in advance and solving an aging state centroid of each classified population, calculating a minimum aging distance based on the position coordinates in step 3, and evaluating the aging state of the silicone rubber composite insulator based on the minimum aging distance.