带并联电抗器的超高压电缆-架空混合线路三相永久性故障识别方法

发布时间：2018-05-08 02:30

本文选题：混合线路 + 并联电抗器　；参考：《电力自动化设备》2017年10期

【摘要】：针对带并联电抗器的超高压电缆-架空混合线路,分析了两相或三相不同性质故障时故障相的残余电压特性,提出了基于差模电压频率测量的相间故障性质识别新判据。混合线路发生故障且两侧断路器跳开后,利用扩展Prony算法快速获取差模电压频率。发生瞬时性故障时,差模电压频率略低于工频;发生永久性故障时,差模电压频率接近于0。基于上述特征可进行瞬时性故障与永久性故障的有效识别,该方法原理简单,且易于实现。大量的EMTDC仿真验证表明,该方法能够有效可靠地实现超高压电缆-架空混合线路的永久性故障与瞬时性故障的识别,且不受过渡电阻、故障位置及电力电缆所占线路全长比例的影响。
[Abstract]:For the UHV cable-overhead hybrid circuit with parallel reactor, the residual voltage characteristics of the fault phase in two or three phase faults with different properties are analyzed, and a new criterion for identifying the fault properties between phases based on differential mode voltage frequency measurement is proposed. After the fault of the hybrid circuit and the skipping of both sides of the circuit breaker, the differential mode voltage frequency can be obtained quickly by using the extended Prony algorithm. When transient fault occurs, the frequency of differential mode voltage is slightly lower than that of power frequency, and the frequency of differential mode voltage is close to 0. Based on the above characteristics, the transient fault and permanent fault can be effectively identified. This method is simple in principle and easy to implement. A large number of EMTDC simulations show that the proposed method can effectively and reliably identify the permanent and transient faults of UHV cable-overhead hybrid lines without transient resistance. The effect of fault location and the proportion of power cable to the total length of line.
【作者单位】：天津大学智能电网教育部重点实验室;
【基金】：国家自然科学基金资助项目(51207102) 高等学校博士学科点专项科研基金新教师类项目(20120032120085)~~
【分类号】：TM75

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