剩余电流动作保护电器动作特性的正确选择

Correct Selection of Operation Characteristics of Residual Current Device

简述不同用电电器在发生剩余电流时可能产生的剩余电流波形类型,以及针对不同波形类型的剩余电流提供保护时,不同动作特性的RCD的工作情况。分析AC型RCD不能对脉动直流剩余电流提供充分保护的原因,并着重介绍常见的双脉冲桥式整流电路产生的脉动直流剩余电流的工作机制及正确选择A型和AC型RCD的动作特性。

The possible residual current waveforms in case of residual current of different electric appliances as well as the operation of RCD of different operation characteristics when protection is provided for the residual current of different waveforms are described. The analysis of causes for a AC- type RCD failing to provide sufficient protection for the residual pulsating direct current is made and the working mechanism of residual pulsating direct current generated by common dual-pulse bridge rectifier circuit as well as the correct selection of operation characteristics of A-type and AC-type RCDs are emphatically introduced.