[1]刘 衍,尹桂来,龙国华,等.应用理化分析探索40.5 kV开关柜绝缘隔板放电原因[J].高压电器,2019,55(09):222-229.[doi:10.13296/j.1001-1609.hva.2019.09.030]
 LIU Yan,YIN Guilai,LONG Guohua,et al.Exploration of Discharge Reasons of Insulation Partition of 40.5 kV Switchgear Based on Physical-chemical Analysis[J].High Voltage Apparatus,2019,55(09):222-229.[doi:10.13296/j.1001-1609.hva.2019.09.030]
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应用理化分析探索40.5 kV开关柜绝缘隔板放电原因()
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《高压电器》[ISSN:1001-1609/CN:61-11271/TM]

卷:
第55卷
期数:
2019年09期
页码:
222-229
栏目:
技术讨论
出版日期:
2019-09-10

文章信息/Info

Title:
Exploration of Discharge Reasons of Insulation Partition of 40.5 kV Switchgear Based on Physical-chemical Analysis
作者:
刘 衍 尹桂来 龙国华 周求宽 邹 阳
(国网江西省电力公司电力科学研究院, 南昌 330096)
Author(s):
LIU Yan YIN Guilai LONG Guohua ZHOU Qiukuan ZOU Yang
(State Grid Jiangxi Electric Power Research Institute, Nanchang 330096, China)
关键词:
40.5 kV开关柜 SMC 绝缘隔板 老化试验 理化分析
Keywords:
40.5 kV switchgear SMC insulation partition aging test physical-chemical analysis
DOI:
10.13296/j.1001-1609.hva.2019.09.030
摘要:
小型化后的40.5 kV开关柜受尺寸限制,普遍采用加装SMC绝缘隔板的复合绝缘方式, 但开关柜母排对绝缘隔板放电的故障仍然较为普遍,因此对放电原因的研究很有必要。文中首 先对一台KYN61-40.5型开关柜进行工频耐压试验,验证运行中开关柜内母排对绝缘隔板放电的 可能性。其次通过绝缘隔板的加速热老化、湿热老化试验,采用SEM测试、交流击穿场强、耐 漏电起痕指数和憎水性检测等绝缘材料测试评估方法,研究绝缘隔板理化特性变化规律,进而 得出放电的原因。研究结果表明:开关柜绝缘隔板故障并非绝缘隔板击穿强度降低引起,而是 在湿热环境下,开关柜内SMC绝缘隔板表面的保护膜分解,降低接触角,使绝缘隔板由憎水性 转变为亲水性,从而当外施电压达到70 kV左右即发生放电;由于环氧树脂材料在老化后依旧 保持良好的憎水性,因此开关柜内绝缘隔板宜采用环氧树脂材质,不宜采用不饱和聚酯玻璃纤 维(SMC)。为了保证绝缘隔板的理化特性,开关柜内运行温度不超过80 ℃,湿度控制在75% 以下。
Abstract:
With the trend of miniaturization, the 40.5 kV switchgear is faced with size restrictions, and composite insulation which installs SMC insulation partition is general used. However, electrical fault between the switchboard bus bar and insulation partition is more common, thus researching the reasons for discharge fault is very necessary. In this paper, a KYN61-40.5 switchgear is first carried on power frequency withstand voltage test, which aims to verifying the possibility of discharge between the switch cabinet bus bar and the insulation partition. Secondly, accelerated thermal aging, hot and humid aging test of insulation baffle insulation partitions are carried on, and properties test of insulating materials such as SEM test, AC breakdown field strength, resistance to tracking index and hydrophobic detection are used to study the change rule of physical-chemical characteristic and reasons for insulation discharge. The experiments results show that the failure of the insulation cabinet of the switchgear is not caused by the decrease of the breakdown strength of the insulation partition. However, in the hot and humid environment, the protective film on the surface of the SMC insulation partition in the switchgear is decomposed and the contact angle is reduced, leading to conversion from hydrophobic to hydrophilic. When the external voltage is about 70 kV, discharge will occurs; and as epoxy insulation baffle still maintain good hydrophobic after aging, the switchgear insulation partition should better use epoxy material, and should not use unsaturated polyester glass fiber(SMC)material; in order to guarantee the physical-chemical properties of insulation partition, switchgear operating temperature should not exceed 80 ℃, and humidity should be controlled below 75%.

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备注/Memo

备注/Memo:
收稿日期:2019-02-06; 修回日期:2019-04-09刘 衍(1983—),男,硕士,高级工程师,主要从事开关设备运行管理及过电压研究。 尹桂来(1983—),男,博士,高级工程师,主要从事绝缘材料使用研究。 龙国华(1992—),男,助理工程师,主要研究方向为电力系过电压、电磁兼容等。 周求宽(1981—),男,硕士,高级工程师,主要从事电力变压器状态诊断及试验研究。
更新日期/Last Update: 2019-09-10