基于电网全景模型的发电机组接地故障快速定位系统设计

Design of generator grounding fault fast location system based on power network panoramic model

传统方法在发电机组检测中存在“过流”效应,导致三相接地故障定位不精准。针对该问题,提出了基于电网全景模型的发电机组接地故障快速定位系统设计。根据CPMU传输信号结构,确定C相CPMU结构,实现自供电。依据故障指示器MCU电路图,实时处理数据传输,构建电网全景模型,设计故障定位流程,计算每条线电压和零序电流之间的相对相位。根据数据存放的数据库条件,确定故障位置。由实验结果可知,该系统检测B相电压超过60 V时B处出现故障,说明定位结果较精准。

Due to the"flow through"effect of traditional methods in generator detection,the three⁃phase grounding fault location is not accurate.In order to solve this problem,a fast positioning system for the grounding fault of the generator set based on the panoramic model of the power grid is proposed.According to the CPMU transmission signal structure,the C⁃phase CPMU structure is determined to achieve self⁃power supply.Process real⁃time data transmission according to fault indicator MCU circuit diagram.The panoramic model of the power network is constructed,the fault location process is designed,the relative phase between the voltage and the zero⁃sequence current of each line is calculated,and the fault location is determined according to the conditions of data storage database.It can be seen from the experimental results that the system detects that there is a fault at B when the B⁃phase voltage exceeds 60 V,indicating that the positioning result is more accurate.