发电机机端PT熔断器慢熔引起断线的故障检测方法研究
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摘要
为解决发电机组机端PT(电压互感器)一次熔断器慢熔不能被PT断线判据所检测的问题,对目前基于电压平衡式原理的PT断线检测方法进行改进,提出了一种基于一次熔断器电流、励磁电压突变量、零序电压及其二次谐波电压含有故障特征量的PT断线判别方法。改进后的判据可同时适用于PT一次侧和二次侧断线的检测,能有效避免因熔断器慢熔而导致机组误强励和匝间保护动作。
Melting fuse of PT(potential transformer) at generator terminal cannot be detected by current PT breaking criterion. Therefore, the existing PT breaking detection method based on balancing voltage is improved, and a method based on fuse current, excitation voltage mutation, zero-sequence voltage and its second harmonic voltage content as fault characteristic quantity is proposed. The improved criterion can be applied to the detection of the primary and secondary sides of PT breaking and it can effectively avoid faulty forced excitation and inter-turn protection due to melting fuse.
Melting fuse of PT(potential transformer) at generator terminal cannot be detected by current PT breaking criterion. Therefore, the existing PT breaking detection method based on balancing voltage is improved, and a method based on fuse current, excitation voltage mutation, zero-sequence voltage and its second harmonic voltage content as fault characteristic quantity is proposed. The improved criterion can be applied to the detection of the primary and secondary sides of PT breaking and it can effectively avoid faulty forced excitation and inter-turn protection due to melting fuse.
引文
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[11]王昕,李乃永,苏欣,等.消弧线圈接地机组的定子基波零序电压保护误动分析[J].电力系统保护与控制,2016,44(7):140-144.
[12]李夏林,刘雅娟,朱武.基于配电网的复合电压暂降源分类与识别新方法[J].电力系统保护与控制,2017,45(2):131-137.
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[16]杨翠茹,王文轩,雷璟,等.配电变压器保护用熔断器或隔离开关片状熔体温度特性分析[J].广东电力,2016,29(5):113-117.
[2]张兵海,孟凡超,苏艳宾,等.发电机电压互感器一次熔断器熔断引起停机的故障分析[J].河北电力技术,2014,33(2):1-3.
[3]刘刚.发电机出口电压互感器的故障分析与处理[J].科技促进发展,2011(S1):202.
[4]卓华.电压互感器熔断器放电导致保护动作的分析与防范[J].神华科技,2014,12(6):60-62.
[5]张怿宁,索南加乐,徐丙垠,等.基于相间电压幅值比较原理的PT断线检测[J].继电器,2005,33(12):22-25.
[6]李志兵,李晓昂,陈维江,等.SF6短间隙中高频电弧的阻抗特性[J].高电压技术,2013,39(6):1411-1417.
[7]杨捷,姚娟,唐宇.F-C真空接触器在电动机保护中的整定计算[J].电力系统保护与控制,2009,37(16):77-80.
[8]方大千,方亚平.实用高低压电器速查速算手册[M].北京:化工化学出版社,2013.
[9]RAUL M,MARLEY B,VERNON C,et al.Resistance of Spark channe[J].IEEE Trans.on Plasma,SG,2006,34(5):1610-1619.
[10]包明磊,李玉平,桑建斌,等.双频式定子接地保护的分析与改进[J].电力系统保护与控制,2016,44(20):106-112.
[11]王昕,李乃永,苏欣,等.消弧线圈接地机组的定子基波零序电压保护误动分析[J].电力系统保护与控制,2016,44(7):140-144.
[12]李夏林,刘雅娟,朱武.基于配电网的复合电压暂降源分类与识别新方法[J].电力系统保护与控制,2017,45(2):131-137.
[13]电能质量-公用电网谐波:GB/T 14549-1993[S].北京:中国标准出版社,1993.
[14]大型发电机变压器继电保护整定计算导则:DL/T 684-2012[S].北京:中国电力出版社,2012.
[15]李圣清,朱英浩,周有庆,等.电网谐波检测方法的综述[J].高电压技术,2004,30(3):39-42.
[16]杨翠茹,王文轩,雷璟,等.配电变压器保护用熔断器或隔离开关片状熔体温度特性分析[J].广东电力,2016,29(5):113-117.