弧光保护通道自检技术的应用研究

Application Research of Channel Self Checking Technology in Arc Flash Relay

摘要:

阐述了中低压开关柜弧光保护通道自检技术的必要性。介绍了通过叠加光脉冲实现弧光通道自检的原理和方法。理论分析递归中值滤波对光脉冲的影响消除，以及光脉冲对背景光计算的误差估计。试验表明，在保证电弧光保护装置不误动的情况下，该方法能有效地对弧光通道进行实时自检，从而提高弧光保护装置运行的可靠性。

关键词:通道自检;递归中值滤波;光脉冲;误差估计;无源传感器

Abstract:

The necessity of self-checking technology for arc transmission channel in arc flash relay of medium-voltage and low-voltage switchgears is described. The principle and methods realizing self checking for arc transmission channel by superimposing pulse light are introduced. It is theoretically analyzed that the recursive median filter algorithm can eliminate the influence of pulse light, and the deviation of pulse light to background light is also estimated. The test shows that in the premise of no misoperation of the device, the method can realize real-time self-checking for arc transmission channel, which can improve the reliability of arc flash relay.

Key words:channel self checking; recursive median filter algorithm; pulse light; deviation estimation;passive arc sensor