1 100 kV特高壓交流復(fù)合套管局放原因分析及改進(jìn)措施
王賽豪1,史恒超2,秦政敏3,孫 英杰1,劉 龍1
(1 平高集團(tuán)有限公司,河南 平頂山 467001;2 河南平高電氣股份有限公司,河南 平頂山 467001;3 河南平芝高壓開關(guān)有限公司,河南 平頂山 467001)
摘 要:1 100 kV特高壓交流復(fù)合套管在例行出廠試驗(yàn)中出現(xiàn)局放超標(biāo)問題,從耐壓設(shè)備、試驗(yàn)場地、裝配過程、測量系統(tǒng)、元件質(zhì)量等多個方面進(jìn)行原因分析,完成套管局放定位,后借助有限元方法對該位置予以確認(rèn)。綜合各種因素分析,局放產(chǎn)生的原因是由于空心復(fù)合絕緣子制造工藝的分散性,導(dǎo)致絕緣件內(nèi)部出現(xiàn)缺陷,進(jìn)而誘發(fā)局部放電。根據(jù)有限元分析結(jié)果,提出了雙層屏蔽結(jié)構(gòu)優(yōu)化措施,重新制造樣機(jī)并進(jìn)行試驗(yàn),試驗(yàn)結(jié)果表明:優(yōu)化后的屏蔽結(jié)構(gòu),能有效提高套管的起暈電壓,降低局放水平,保證產(chǎn)品可靠安全運(yùn)行。
關(guān)鍵詞:特高壓套管;局部放電;雙層屏蔽;電場分析
中圖分類號:TM 216+.5;TM 853 文獻(xiàn)標(biāo)識碼:A 文章編號:1007-3175(2017)09-0027-05
Partial Discharge Cause Analysis of 1 100 kV Extra-High Voltage AC Composite Bushing and Improvement Measure
WANG Sai-hao1, SHI Heng-chao2, QIN Zheng-min3, SUN Ying-jie1, LIU Long1
(1 Pinggao Group Co., Ltd, Pingdingshan 46 7001, China;2 Henan Pinggao Electric Co., Ltd, Pingdingshan 46 7001, China;
3 Henan Pingzhi High Voltage Switchgear Co., Ltd, Pingdingshan 46 7001, China)
Abstract: The partial discharge (PD) problem occurs in the 1 100 kV extra-high voltage AC composite bushing's routine factory test. This paper carried out the cause analysis from the respects, such as voltage test apparatus, test site environment, assembly process, test system, and component quality etc to complete the bushing PD location and to determine the location by the finite element analysis method. According to the synthesized analysis of various factors, it was found that the reason for PD was dispersion on composite bushing’s manufacturing process, which led to internal defects in insulators and caused PD to happen ultimately. Based on the finite element analysis result, this paper proposed the double-deck shield structure optimization measures to re-manufacture the prototype, carrying out test for it. The final test result shows that the optimized shield structure can raise bushing’s discharge inception voltage effectively, which reduces the PD level to ensure the reliable and safe operation for the products.
Key words: extra-high voltage bushing; partial discharge; double-deck shield; electric field analysis
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