Method for high-impedance fault detection
Method for high-impedance fault detection
复制标题
高阻抗故障检测方法
DOI：
10.1049/oap-cired.2017.0308
复制
发表时间：
2017
影响因子：
4.4
通讯作者：
P. Hovila
中科院分区：
文献类型：
--
作者：
H. Laaksonen;P. Hovila
高阻抗故障(HIF)的正确检测至关重要，因为它们会对人、牲畜和财产造成严重威胁。HIF电流的故障电阻通常在10到100kΩ之间，传统的保护功能无法检测到这些电流，而且它们的行为是随机的，由幅度、谐波水平等不稳定和不可预测的动态波动组成。其中一个主要挑战是可靠地将HIF与正常网络负载和其他开关事件分开。在这项研究中，基于广泛的电力系统计算机辅助设计(PSCAD)仿真研究和实际测量的HIF测试，提出了一种新的HIF检测方法。该方法适用于不同接地方式的中压电网。根据接地类型的不同，HIF检测基于零序电流I0或负序电流I2的使用。该方法可在50和60赫兹网络中工作，不需要测量电压。它还具有跳闸保护功能，操作时间足够短，简单/灵活，从终端用户的角度来看，具有良好的可用性。
Correct detection of high-impedance faults (HIFs) is crucial because they produce a serious threat for humans, livestock and property. HIF currents, typically with fault resistances between 10 and 100 kΩ, cannot be detected with traditional protection functions and they behave randomly consisting of unstable and unpredictable dynamic fluctuations in the amplitude, harmonic levels etc. One main challenge is to reliably separate HIFs from normal network load and other switching events. In this study, new HIF detection method is proposed based on extensive power systems computer aided design (PSCAD) simulation studies and tests with real-life HIF measurements. The proposed method is applicable to different MV networks with different grounding practices. Depending on the grounding type, HIF detection is based on the use of zero sequence currentIoor negative sequence currentI2. Method works in both 50 and 60 Hz networks and does not need voltage measurement. It also works as tripping protection function with sufficiently short operation time, is simple/flexible and has good usability from end user point of view.