低压脱扣器电子电路电压暂降敏感特性试验研究

Experimental research on sensitive characteristic to voltage sag for electronic circuit of low-voltage release

在对低压脱扣器电磁结构的工作状态进行简要分析的基础上,制定试验方案,建立基于自主研制的电压暂降发生仪的试验平台。以220 V低压脱扣器为对象,进行了电子电路电压暂降敏感特性试验,获取低压脱扣器电子电路在输入不同暂降信号时的输出电压波形。结合低压脱扣器的电压耐受曲线,将电子电路的工作状态划分为幅值较小、幅值较大、持续时间较短、持续时间较长、中间的幅值和持续时间、正常工作6种模态。分析了每种模态下电子电路的输入和输出电压实测波形及其对低压脱扣器动作情况的影响,结果表明:电子电路的输出电压波形与输入电压暂降信号的幅值和持续时间呈现规律的关联关系,输出电压波形具有明显的分阶段特征,决定了低压脱扣器的动作特性。

The electromagnetic mechanism and its working states of low-voltage release are briefly analyzed,a test scheme is made and an experimental platform is designed based on a self-developed voltage-sag generator. An electronic circuit test of sensitive characteristic to voltage-sag is carried out for a 220 k V lowvoltage release and its output voltage waveforms responding to different input voltage-sag signals are obtained. According to the voltage tolerance curve of low-voltage release,the working states of electronic circuit are divided into six modes：small amplitude,large amplitude,short duration,long duration,middle amplitude and duration,normal operation. The measured input and output voltage waveforms of the electronic circuit of low-voltage release as well as their impacts on its operation are analyzed for each mode. The analytical results show that,closely related to the amplitude and duration of the input voltage sag signals,the output voltage waveform of electronic circuit is characterized by its obvious stages,which decides the operating features of low-voltage release.