基于介电特征量的发电机定子绕组主绝缘老化诊断及寿命评估
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摘要
tanδ、Δtanδ、ΔC、Q_(max)等绝缘介电特征量与发电机定子绕组主绝缘剩余击穿电压有很好的相关性,能够有效表征主绝缘的老化状态。通过对某老旧发电机近10年特征量进行分析,研究了这些参量随运行年数的变化关系,得出该发电机绝缘已老化的结论,并利用经验公式对绝缘剩余寿命进行了预测。电镜扫描和热重分析等方法验证了绝缘老化的存在,证明了介电参数在老化鉴定方面的有效性。
The dielectric dissipation characteristic parameters,such as tanδ,Δtanδ,ΔC and Q_(max),are highly rated to the remaining breakdown voltage of the generator stator insulation,and could effectively characterize the aging condition of the insulation. Based on the characteristic parameters in the last 10 years for one old generator,the trend of the parameters with different operating years are studied,revealing that the insulation is under severe aging. Meanwhile,the remaining life is calculated by empirical formula. In addtion,scanning electron microscope( SEM) and thermogravimetry( TG) show the existence of the insulation aging,and prove that these parameters can work effectively in aging appraise of the stator insulation.
The dielectric dissipation characteristic parameters,such as tanδ,Δtanδ,ΔC and Q_(max),are highly rated to the remaining breakdown voltage of the generator stator insulation,and could effectively characterize the aging condition of the insulation. Based on the characteristic parameters in the last 10 years for one old generator,the trend of the parameters with different operating years are studied,revealing that the insulation is under severe aging. Meanwhile,the remaining life is calculated by empirical formula. In addtion,scanning electron microscope( SEM) and thermogravimetry( TG) show the existence of the insulation aging,and prove that these parameters can work effectively in aging appraise of the stator insulation.
引文
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[9]金神雅树.水轮发电机绝缘剩余寿命的推断[J].国外大电机,1998(4):52-56.
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[2]贾志东,乐波,张晓虹,等.发电机定子主绝缘老化特征的研究[J].电网技术,2000,24(4):7-11.
[3]鲍棋铭,高乃奎,马小芹,等.大型发电机主绝缘老化的热分析研究[J].中国电机工程学报,2003,23(7):99-101.
[4]佐佐木合,关玉薇.提高水轮发电机剩余寿命诊断精度[J].国外大电机,2000(3):24-27.
[5]张蕊,严璋.预测大电机绝缘寿命方法综述[J].大电机技术,2004(4):41-43.
[6]白恺.大型电机定子绕组绝缘系统的诊断性试验及其标准[J].华北电力技术,2006(4):40-45.
[7]郝艳捧,王国利.大电机定子线棒绝缘状态诊断的研究进展[J].高电压工程,2001,27(1):4-6.
[8]中华人民共和国国家能源局.发电机定子绕组环氧粉云母绝缘老化鉴定导则:DL/T 492—2009[S].北京:中国电力出版社,2009.
[9]金神雅树.水轮发电机绝缘剩余寿命的推断[J].国外大电机,1998(4):52-56.
[10]张百华,高乃奎,马小芹,等.基于运行历史的大电机主绝缘老化特性的研究[J].中国电机工程学报,2004,24(8):134-137.