基于AVR真空断路器灭弧室真空度在线监测装置  

On-line condition monitoring system based on AVR MCU

作　　者：孙熠[1] 张阔[1] 仇英辉[1] 

机构地区：[1]华北电力大学电气工程学院,北京102206

出　　处：《电工电能新技术》2014年第2期76-80,共5页Advanced Technology of Electrical Engineering and Energy

摘　　要：真空开关内部气体压强是决定其电气性能的主要因素,真空灭弧室压强减小将降低真空开关耐受系统电压的能力。本文提出了一种基于AVR单片机在线监测真空灭弧室真空度的设计和实现方案,处理器AVR芯片利用片内资源简化了设计的复杂性,增强了整个系统的电磁兼容性。采用高阶数字滤波器分离传感器信号中的工频信号和高频信号,通过三相不对称算法、趋势判断法、高次谐波法综合诊断真空灭弧室内的真空度,提高了在线监测的灵敏度和可靠性。RS485接口可方便与计算机连接,通信距离较长,抗干扰能力强,具有很强的实用性。The internal gas pressure of vacuum circuit breakers （VCBs） is a key influencing factor on the electric properties of vacuum circuit breakers. The dielectric strength of vacuum circuit breakers will decreased with the gas pressure increasing in vacuum interrupters. This paper introduced a method to detect vacuum arc on-line based on AVR MCU which could reduce the complexity of the system and keep high electromagnetic compatibility perform- ance. By using high order digital filter to separate the power frequency signal and high frequency signal, and by u- sing three phase asymmetric algorithm, tendency judging method, and high order harmonic method to diagnose comprehensively the vacuum in the arc-extinguishing chamber the sensitivity and reliability of the system can be en- hanced. This system used RS485 interface to connect to the computer, which has a long communication distance and strong anti interference capability. In addition, the RS485 interface is convenient to connect to the computer. This system is very practical and suitable for promotion.

关 键 词：真空度 真空灭弧室 在线监测 数字信号处理 数字滤波器 

分 类 号：TM561.5[电气工程—电器]