中性点非有效接地配电网的单相接地定位能力测试技术

Performance Testing of Single Phase to Earth Fault Location for Distribution Network with Neutral Point Non-effectively Grounded Systems

为检验中性点非有效接地配电网的单相接地定位能力,探索了单相接地定位现场测试技术。分析了采用二次模拟测试法进行单相接地定位能力现场测试面临的困难。提出了一种基于可控弧光放电装置的单相接地定位能力测试方法,其能够在现场方便地发生直接接地、稳定电弧接地、间歇性电弧接地、金属性接地、经各种过渡电阻接地、永久性接地、瞬时性接地等各种单相接地现象。论述了基于可控弧光放电装置的移动式单相接地现场测试成套设备的组成,介绍了其应用和现场测试情况。结果表明,所提出的单相接地定位能力现场测试方法和所研制的测试设备可行且有效。

To evaluate the location performance of single phase to earth fault in distribution systems, the corresponding test technology is investigated. According to an analysis of the drawbacks of the secondary injection test method, it is pointed out that it is not suitable for the evaluation of the location performance of single phase to earth fault. A new approach to test the behavior of single phase to earth fault location featuring a controllable electric arc generating device is put forward. With the new device, the phenomenon of permanent and temporary single phase to earth without arc, with stable arc or intermittent arc through various transitional resistance can be generated in the field. The composition of moveable complete equipment for the single phase to earth fault location test in the field is described. The application of the approach proposed is briefly treated, which shows its feasibility and effectiveness for evaluation of the location performance of single phase to earth fault.