PT熔断器故障原因挖掘及治理方法分析  

PT Fuse Failure Causes of Mining and Prevention Methods Analysis

作　　者：胡强[1] 李泽冰[2] 叶君[2] 

机构地区：[1]重庆市电力公司南岸供电局,重庆400060 [2]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030

出　　处：《电测与仪表》2011年第11期58-62,共5页Electrical Measurement & Instrumentation

基　　金：国家重点基础研究计划(973)资助项目(2009CB724506);重庆大学输配电装备及系统安全与新技术国家重点实验室访问学者基金资助项目(2007DA10512709408);中央高校基本科研业务费资助项目(CDJZR10150016)

摘　　要：为了有效分析PT熔断器故障因素,首先根据PT熔断器运行情况,通过建立熔断器故障模型,分析了熔断器故障电流与故障原因之间的数学关系,并进行了仿真计算。结果表明,造成熔断器熔断故障的主要因素以系统铁磁谐振及低频饱和电流为主,其中铁磁谐振故障电压的峰值可以达到正常运行时的2.5倍左右。针对引起故障的主要因素,文中提出了防止熔断器故障的方法,并重点对防止铁磁谐振的方法进行了仿真分析,仿真结果表明,在一次绕组中性点处加装消谐器或非线性电阻等措施可以使铁磁谐振故障电压的峰值下降1倍左右,这对减少系统中熔断器故障的发生以及减少由此造成的经济损失具有重要的意义。In order to analyze the fault factors of the PT fuse, first of all, according to the operation condition of PT fuse the paper establishes fuse fault model, then it analyzes the mathematical relationship between the fault current and the fault reasons and simulation calculation. The results show that the main cause fuse fusing fault factors which the ferromagnetic resonance and low-frequency saturation current, and the ferromagnetic resonance peak fault voltage can achieve about 2.5 times of the normal voltage. According to the main factors caused by fault, the paper puts forward the method to prevent fuse fault, and the key to prevent ferromagnetic resonance method on the simulation analysis. The simulation results show that in a winding with neutral place selective harmonic elimination device, or nonlinear resistors can make ferromagnetic resonance measures such as the peak voltage drop about failure to reduce twice in the system, which fuses of failure and reduce the resulting economic loss has the vital significance.

关 键 词：熔断器 电压互感器 原因 预防方法 故障 

分 类 号：TM933[电气工程—电力电子与电力传动]