低压脱扣器电压暂降试验分析及配置策略研究

Experiment analysis on low-voltage release under voltage sags and its configuration strategy research

当前配网中低压脱扣器因电压暂降事件动作跳闸,会导致用户负荷损失严重,针对此问题,国内外均尚未针对低压脱扣器提出行之有效的配置策略。本文首先分析了低压脱扣器工作原理,归纳并分析了影响低压脱扣器正常工作的诸多因素(电压波动、过电压、谐波、欠频等)。其次,在深入分析现行国家标准基础上,设计了电压暂降试验平台和试验步骤,以目前主流DW45系列万能式断路器所配置GXQ-M型低压脱扣器为例,进行了试验研究,分析其在电压暂降作用下的动作区域、不动作区域和模糊区域。最后,结合试验结果,分别从制造商、用户以及供电部门等方面提出了低压脱扣器应对电压暂降的要求与配置策略,并建议国家标准进行修改。

The false tripping of low-voltage releases in distribution network has happened several times and customers have endured great load loss,but the corresponding configuration strategy of low-voltage release has not been put forward. In this paper,the working principle of low-voltage release is analyzed,and the factors（ such as voltage fluctuation,over voltage,harmonic and under frequency） that can cause false tripping of low-voltage release are summarized. Secondly,the voltage sag test platform and procedure are designed based on the existing Chinese National Standard,and GXQ-M low-voltage release suitable for DW45 series circuit breakers is taken as an example to test,the tripping area,fuzzy area and no tripping area of GXQ-M low-voltage release are obtained and analyzed. At last,combined with the test results,the configuration strategy of low-voltage release is put forward from the perspective of manufacturers,customers and utility companies,and this paper also recommends the existing Chinese National Standard revising.