基于低压脉冲法的电力电缆外力破坏检测技术研究

Research on Extemal Destruction Detection Technology for Power Cable Based on Low-voltage Pulse Method

摘要:

随着城网改造工作的进一步深入，电力电缆得到了越来越广泛的应用。电力电缆一旦出现故障，将严重危及 电网安全和人民财产的安全，而外力破坏是造成电缆故障最主要的因素。采用 EMTP － ATP 电磁暂态仿真软件建立 了不同电缆故障模型，研究了不同频率的行波在电缆内的传播特性，分析了不同故障、电缆接头下行波在电缆内的传 播特性。研究结果表明，该方法能够有效检测电缆外力破坏点位置。

Abstract:

With the further development of transformation for urban power grid，power cables are more and more widely used． Once the power cable fails，it will seriously endanger the safety of power grid and people's property． The external destruction is the most important factor of cable faults． The EMTP － ATP electromagnetic transient simulation software is adopted to establish the models of different cable fault． The propagation characteristics of traveling wave with different frequency in the cable are studied，and the propagation characteristics of traveling wave in the cable connectors under different faults are analyzed． The results show that the proposed method can effectively detect the location of external destruction for power cable．