(1 State Grid Zhejiang Electric Power Co.,Ltd. Hangzhou Yuhang District Power Supply Company, Hangzhou 311100, China;
2 State Grid Zhejiang Electric Power Co.,Ltd. Electric Power Research Institute, Hangzhou 310014, China;
3 State Grid Zhejiang Electric Power Co.,Ltd. Zhoushan Power Supply Company, Zhoushan 316021, China;
4 School of Intelligent Manufacturing, Taizhou University, Taizhou 318000, China)
Abstract: In complex outdoor working environments, especially on transmission lines in the southern coastal areas, due to factors such as contamination and creepage, high temperature and humidity, and aging of the sheath, some composite insulators have defects such as surface contamination, hardening and embrittlement of the umbrella skirt, and damage to the sheath. In this paper, based on two insulator breakdown events that occurred on adjacent towers of the same 110 kV transmission line, the line insulators were subject to appearance inspection, hydrophobicity test, salt density test, water diffusion test, tracking resistance test and profile inspection.The causes of discharge flashover and breakdown process of the composite insulators were analyzed. The results show that both composite insulators are in a coastal salt spray environment,the resistance of the sheath material to leakage tracking decreases. Under the action of surface leakage current, electrical erosion gradually occurs, damaging the sheath and exposing the core rod. With the passage of time, the defect length increases, eventually leading to breakdown. The operation and maintenance opinions for the subsequent composite insulators of coastal transmission lines were provided.
Key words: composite insulator; interface breakdown; discharge flashover; coastal transmission line; salt spray environment
參考文獻(xiàn)
[1] 李特,王少華,柳青山, 等.±800 kV 特高壓賓金直流懸式及支柱絕緣子自然積污特性[J] . 電網(wǎng)技術(shù),2017,41(11) :3553-3558.
[2] 周立瑋,葉昊亮,李特,等. 可見光干擾下復(fù)合絕緣子紅外測(cè)試溫度分布特征研究[J] . 智慧電力,2025,53(1) :31-37.
[3] 張鵬,胡攀峰,陳瀟一,等. 高聚物復(fù)合絕緣子憎水性能的研究[J]. 智慧電力,2020,48(12) :97-103.
[4] 韋曉星, 游傳榜, 劉婉瑩, 等. 換流站液體硅橡膠復(fù)合外套材料老化與性能恢復(fù)[J] . 電瓷避雷器,2018(6) :145-149.
[5] 文龍,李特,趙浩然,等.220 kV 沿海線路復(fù)合絕緣子異常發(fā)熱問題原因分析[J] . 電工技術(shù),2023(21) :210-213.
[6] 徐澤浩. 基于 YOLO 結(jié)構(gòu)的輕量級(jí)絕緣子缺陷檢測(cè)算法改進(jìn)與應(yīng)用[D]. 蘭州:蘭州交通大學(xué),2024.
[7] 李特,何堅(jiān),吳旭翔,等. 一起 1000 kV 輸電線路復(fù)合絕緣子蝕損缺陷問題分析[J]. 電工技術(shù),2024(1):90-94.
[8] 申文偉,宋偉,王國利,等. 復(fù)合絕緣子 HTV 硅橡膠材料老化特性的研究[J]. 高壓電器,2013,49(2) :1-7.
[9] 畢曉甜,高嵩,劉洋,等. 一起重金屬粉塵地區(qū)復(fù)合絕緣子閃絡(luò)故障分析[J] . 電瓷避雷器,2020(4) :221-227.
[10] 袁田,張銳,張勤,等. 運(yùn)行復(fù)合絕緣子護(hù)套與芯棒界面蝕損問題探討[J]. 電瓷避雷器,2015(4) :19-24.
[11] 盧明,劉澤輝,高超,等. 國內(nèi)輸電線路復(fù)合絕緣子典型故障情況調(diào)查及原因分析[J] . 電瓷避雷器,2022(4) :214-220.
[12] 李特,王少華,葉金標(biāo),等. 含人工缺陷復(fù)合絕緣子紅外特征試驗(yàn)研究[J]. 浙江電力,2021,40(4) :94-100.
[13] 吳旭翔,朱其杰,李特,等. 一起 500 kV 線路復(fù)合絕緣子發(fā)熱缺陷分析[J]. 電工電氣,2023(10) :36-41.
[14] 李特,王堯平,李響,等.±500 kV 葛南線絕緣子自然積污特性研究[J]. 浙江電力,2023,42(6) :98-104.
[15] 賈志東,楊朝翔,王希林,等. 基于憎水遷移性測(cè)試的復(fù)合絕緣子老化特性[J] . 高電壓技術(shù),2015,41(6) :1907-1914.
[16] 孟祥龍,尚瑞琦,樊浩楠,等. 濕熱環(huán)境下脂環(huán)族環(huán)氧樹脂絕緣子和硅橡膠復(fù)合絕緣子芯棒-護(hù)套界面老化特性研究[J]. 電網(wǎng)技術(shù),2023,47(1) :396-403.
[17] 宋朋,孫成賢,陳柏文. 基于圖像識(shí)別的特高壓輸電線路絕緣子閃絡(luò)故障檢測(cè)[J] . 電工技術(shù),2024(16) :104-107.
[18] 曹曉源,董宇恒. 高壓線路瓷支柱絕緣子破損故障帶電檢測(cè)技術(shù)研究[J]. 電工技術(shù),2025(1) :188-190.