矿用乙丙橡胶电缆绝缘电热老化状态评估
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摘要
针对乙丙橡胶电缆在电热作用下的绝缘老化特性研究较少的问题,对矿用乙丙橡胶电缆进行了电热联合老化试验,分析了乙丙橡胶电缆绝缘在不同老化时间下的极化/去极化电流特性,提出了反映绝缘老化程度的特征参量——老化指数和去极化电量。结果表明,随着老化时间的增加,乙丙橡胶电缆绝缘表面颜色由白色逐渐加深变为棕色,老化后期绝缘外层生成白色粉末状物质,绝缘内形成较多孔洞;绝缘的极化电流和去极化电流均随老化时间的增加逐渐增大,其中去极化电流在老化前期变化明显,在老化后期变化较小;分别根据极化电流和去极化电流计算得到的老化指数和去极化电量均随老化时间的增加而增大,可作为评估乙丙橡胶电缆绝缘老化状态的特征参量。
There are few studies on insulation aging characteristics of ethylene propylene rubber cable under electro-thermal aging.According to the above problem,electro-thermal aging test of mine-used ethylene propylene rubber cable was carried out,polarization and depolarization current characteristics of ethylene propylene rubber cable insulation under different aging time were analyzed,and characteristic parameters which could reflect insulation aging degree including aging index and depolarization charge quantity were proposed.The results show that color of insulation surface of ethylene propylene rubber cable gradually changes from white to brown with increase of aging time.In the late aging stage,white powdered material is generated in outer insulation layer,and many holes are formed in the insulation.Polarization current and depolarization current of the insulation increase gradually with increase of aging time.Change of the depolarization current is obviously in the early aging stage and small in the late agingstage.Aging index calculated by the polarization current and depolarization charge quantity calculated by the depolarization current increase with increase of aging time,which can be used as characteristic parameters to evaluate insulation aging state of ethylene propylene rubber cable.
There are few studies on insulation aging characteristics of ethylene propylene rubber cable under electro-thermal aging.According to the above problem,electro-thermal aging test of mine-used ethylene propylene rubber cable was carried out,polarization and depolarization current characteristics of ethylene propylene rubber cable insulation under different aging time were analyzed,and characteristic parameters which could reflect insulation aging degree including aging index and depolarization charge quantity were proposed.The results show that color of insulation surface of ethylene propylene rubber cable gradually changes from white to brown with increase of aging time.In the late aging stage,white powdered material is generated in outer insulation layer,and many holes are formed in the insulation.Polarization current and depolarization current of the insulation increase gradually with increase of aging time.Change of the depolarization current is obviously in the early aging stage and small in the late agingstage.Aging index calculated by the polarization current and depolarization charge quantity calculated by the depolarization current increase with increase of aging time,which can be used as characteristic parameters to evaluate insulation aging state of ethylene propylene rubber cable.
引文
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[2]雷志鹏.乙丙橡胶绝缘介电性能及其气隙和沿面放电机理的研究[D].太原:太原理工大学,2015.
[3]王国法.高效综合机械化采煤成套装备技术[M].徐州:中国矿业大学出版社,2008.
[4]张潇,王彦文,赵永梅,等.矿用高压电缆绝缘在线监测方法[J].工矿自动化,2017,43(4):60-63.ZHANG Xiao,WANG Yanwen,ZHAO Yongmei,et al.Online monitoring method of mine-used high voltage cable insulation[J].Industry and Mine Automation,2017,43(4):60-63.
[5]李磊,马宪民,范文玲.一种矿用电缆剩余寿命预测方法[J].工矿自动化,2018,44(8):57-62.LI Lei,MA Xianmin,FAN Wenling.A residual life prediction method of mine-used cable[J].Industry and Mine Automation,2018,44(8):57-62.
[6]雷志鹏,冯晨,宋建成,等.乙丙橡胶绝缘的表面击穿与沿面放电特性[J].高电压技术,2016,42(12):3924-3933.LEI Zhipeng,FENG Chen,SONG Jiancheng,et al.Surfacebreakdownandsurfacedischarge characteristics of ethylene propylene rubber insulation[J].High Voltage Engineering,2016,42(12):3924-3933.
[7]冯晨,雷志鹏,任鸿秋,等.乙丙橡胶表面电痕腐蚀对极化-去极化电流的影响[J].高压电器,2017,53(10):136-141.FENG Chen,LEI Zhipeng,REN Hongqiu,et al.Effect of surface electrical tracking of ethylene propylenerubberonpolarization-depolarization current[J].High Voltage Apparatus,2017,53(10):136-141.
[8] MAZZANTI G,MONTANARI G C.Electrical aging and life models:the role of space charge[J].IEEE Transactions on Dielectrics and Electrical Insulation,2005,12(5):876-890.
[9] FABIANI D,MONTANARI G C,DISSADO L A,et al.Fast and slow charge packets in polymeric materials under DC stress[J].IEEE Transactions on Dielectrics and Electrical Insulation,2009,16(1):241-250.
[10] KIM D S,KANG M S,OH J H,et al.Temperature dependency and dielectric properties of EPDM with void[C]//5th International Conference on Properties and Applications of Dielectric Materials,Seoul,1997:972-975.
[11] LEI Zhipeng,SONG Jiancheng,TIAN Muqin,et al.Partial discharges of cavities in ethylene propylene rubber insulation[J].IEEE Transactions on Dielectrics and Electrical Insulation,2014,21(4):1647-1659.
[12]兰莉.温度对聚合物绝缘中空间电荷行为的影响[D].上海:上海交通大学,2015.
[13]廖瑞金,袁泉,唐超,等.不同老化因素对油纸绝缘介质频域谱特性的影响[J].高电压技术,2010,36(7):1612-1618.LIAO Ruijin,YUAN Quan,TANG Chao,et al.Influenceofdifferentagingconditionson characteristics of frequency domain spectroscopy of oil-paper insulation medium[J].High Voltage Engineering,2010,36(7):1612-1618.
[14] BIRKNER P.Field experience with a condition-based maintenance program of 20 kV XLPE distribution system using IRC-analysis[J].IEEE Transactions on Power Delivery,2004,19(1):3-8.
[15] XU Xiaoxiao,LIN Lingyan,SONG Jiancheng,et al.Effect of temperature on space charge characteristics of ethylene propylene dine monomer[C]//IEEE 2nd International Conference on Dielectrics,Budapest,2018:1-4.