10 kV配电网故障在线监测和定位分析

10 kV Distribution Network Fault Online Monitoring and Location Analysis

我国供电模式相对落后,功率损耗较大,单相接地等故障时有发生,用电高峰期频繁掉电事故依然存在。配网电缆属于小电流接地系统,发生单相接地故障时,故障稳态电流微弱,特征不明显,应用常用的基于故障稳态信号的测距方法会有一定的限制。因此,对电力系统配网电缆单相接地等类型故障进行准确定位还需要进一步研究和改进。通过研究常见电力故障类型的分析和电力电缆故障测距方法,采用数学分析模型,利用仿真软件和行波传输特点计算分析故障电流,最终可精准测量故障位置。

China’s power supply mode is relatively backward,power loss is still large,single-phase grounding and other faults still occur,and frequent power failures still exist during peak power consumption.The network cable belongs to a low-current grounding system.When a single-phase grounding fault occurs,the steady-state current of the fault is weak and the characteristics are not obvious.The application of the existing commonly used ranging methods based on the steady-state signal of the fault will have certain restrictions,which will impose certain restrictions on the power system distribution network Accurate positioning of cable single-phase grounding and other types of faults requires further research and improvement.Based on the analysis of common power fault types and the method of power cable fault location,the fault current is calculated and analyzed by using simulation software and traveling wave transmission characteristics,and the fault location can be measured accurately.