文章信息/Info

Title:

Corona Aging Characteristics of HTV Silicone Rubber Material Under High Humidity Conditions

文章編號:

1674-3962(2021)01-0074-07

作者:

畢茂強; 潘愛川; 董揚; 楊俊偉; 江天炎; 陳曦

(重慶理工大學電氣與電子工程學院，重慶 400054)

Author(s):

BI Maoqiang; PAN Aichuan; DONG Yang; YANG Junwei; JIANG Tianyan; CHEN Xi

（School of Electrical and Electronic Engineering, Chongqing University of Technology, Chongqing 400054, China）

關鍵詞:

硅橡膠; 電暈老化; 憎水性; 核磁共振; 高濕度環境

Keywords:

silicone rubber;  corona aging;  hydrophobicity;  nuclear magnetic resonance;  high humidity environment

分類號:

TM211

DOI:

10.7502/j.issn.1674-3962.201911024

文獻標志碼:

A

摘要:

復合絕緣子在我國電網中已得到大規模應用，高濕度條件下運行中的絕緣子兩端在強電場條件下極易發生電暈放電，使絕緣子外套硅橡膠材料劣化，嚴重時可導致絕緣子閃絡，威脅電網的安全運行。以一種復合絕緣子外套用硅橡膠材料為試品，采用多針-板電極，在高濕度（RH>95%）環境中對其進行100 h的電暈老化試驗，并采用靜態接觸角、掃描電鏡(SEM)、核磁共振(NMR)和傅立葉紅外光譜（FTIR）等方法分析了試品的電暈老化特性。研究結果表明：高濕度條件下硅橡膠材料憎水性大幅降低，靜態接觸角由108.45°下降至55.47°，憎水性受到嚴重破壞；材料表面出現龜裂，微觀表面出現裂紋、孔洞、溝壑；老化后材料的橫向弛豫時間T2出現下降，內部H原子所在化學鍵與基團發生改變；部分分子主鏈斷裂，微觀結構發生變化，形成親水性的—OH，絕緣性能降低。該研究結果可為我國西南地區或沿海、多雨和多霧等高濕度地區的復合絕緣子的設計、運行及維護提供一定的參考。

Abstract:

Composite insulators have been widely used in China’s power grids. Both ends of the insulators operating under high humidity conditions are prone to corona discharge under strong electric field conditions, which will degrade the silicone rubber material of insulator jackets, and cause the insulator to flashover and threaten the safe operation of the power grid in severe cases. In this paper, a composite rubber insulator is used as a test piece, and a multi-needle-plate electrode is used to perform a 100 h corona aging test in a high humidity (RH>95%) environment, and static contact angle, scanning electron microscopy (SEM), nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopy (FTIR) are used to analyze the corona aging characteristics of the samples. The results show that the hydrophobicity of the silicone rubber material is greatly reduced under high humidity conditions, the static contact angle is reduced from 108.45° to 55.47°, and the hydrophobicity is seriously damaged. Cracks appear on the surface of the material, cracks, holes and gullies appear on the microscopic surface. The transverse relaxation time T2 of the material decreases after aging, and the chemical bonds and groups of the internal H atoms change. Some of the molecular main chains break and the microstructure changes, and the hydrophilic —OH is formed, and the electrical properties are reduced. The research results in this paper can provide a certain reference for the design, operation and maintenance of composite insulators in southwestern China or coastal, rainy and foggy areas with high humidity.