摘要
智能电网的快速发展带动了智能电表的普及应用,同时也伴随着日益严重的雷电灾害问题。为了合理保护智能电表等终端采集设备,需要研究雷电浪涌对其危害。通过对智能电表进行雷电浪涌抗扰度试验,分析其损坏形式和失效原因。利用ATP-EMTP软件搭建配电系统模型,分析雷电侵入波对智能电表的危害。试验与仿真结果表明:智能电表损坏形式主要为表内采集器损坏、电源模块损坏、RS485口损坏;智能电表终端距变压器距离越近,终端过电压幅值越大;接地电阻对终端SPD保护效果影响较大,接地电阻的增大降低了保护效果。在智能电表终端安装SPD与前端SPD实现配合可以有效保护智能电表,但是需要尽可能降低接地电阻值。
The rapid development of intelligent electric grid has driven the popularization ot intelligent ammeters, which has also brought problems involving lightning disasters to the fore. In order to protect intelligent ammeters properly, it is necessary to study the harm of lightning surge. Surge immunity test of intelligent ammeters is carried out to analyze the damage form and failure cause. A model of the distribution system is established in ATP-EMTP to analyze lightning surge damage to intelligent ammeters. The experiment and simulation results show that： typical failures of intelligent ammeters include damage of collectors, power module and RS485 interfaces; the voltage on the terminal of the intelligent ammeter increases with the reduce of the distance between it and the transformer; the earth resistance also has greater effect on the protection effect of terminal surge protection device （SPD）, the increase in grounding resistance reduces the protection effect. Installing SPD in intelligent ammeter terminal and cooperate with front-end SPD will protect the intelligent ammeter effectively, but it is necessary to reduce the grounding resistance as much as possible.
出处
《电瓷避雷器》
CAS
北大核心
2017年第4期120-124,共5页
Insulators and Surge Arresters
