10 kV线路局放对中压设备影响分析及监测策略改进

Analysis of Influence of 10 kV Line Partial Discharge on Middle-voltage Equipment and Modification for Monitoring Strategy

通过建立10 kV电缆的等效电路模型,计算电缆物理参数,进而获得脉冲电流信号在电缆中传输的频谱特性,并以其为基础,结合城市配网的运行实际需求进行方案优化。分析结果表明以中后期的局放信号为监测目标,结合后插避雷器的等效电容回路能达到很好的监测效果,从而更好地对线路绝缘状态进行诊断评估。

By establishing the equivalent circuit model of 10 kV cable and calculating the physical parameters of the cable,the spectrum characteristics of the pulse current signal transmitted in the cable are obtained.Based on this,the scheme is optimized according to the actual operation requirements of the urban distribution network.Aiming at detecting partial discharge signal in the middle and long period,by combining the equivalent capacitance circuit model of rear arrester,a good monitoring result can be achieved,thereby benefiting diagnosis and evaluation of the state of line insulation.