摘要
针对已有高电压无功补偿装置存在的不能对补偿电容进行有效保护、运行可靠性差、易造成谐波污染等不足,设计了一种集谐波检测、记忆、治理和过电压、超温度保护于一体,功能完善的新型高电压无功电容补偿装置。谐波检测、记忆电路的频率在150 Hz或250 Hz左右时,启动相应电路进行保护,并使运算放大器始终输出高电位,记忆指示灯永久性点亮。高电压滤波单元在工频状态时串联电抗器呈低阻抗,能量消耗小;出现谐波时,串联电抗器呈高阻抗,可限制电容电流的增加,当谐波超过允许值时,断开电力电容,对电容进行保护。当电压或温度超过设定值时,就会启动相应的过电压、超温度保护电路,对系统进行保护。该装置电路简单、运行安全可靠。
As the existing high voltage reactive compensation devices do not effectively protect their compensating capacitors,causing harmonic pollution and lower operational reliability,a device with comprehensive functions is designed,which integrates the harmonic detection,memory and control with the over-voltage and over-temperature protections. When the frequency is about 150 Hz or 250 Hz,the harmonic detection and memory circuit enables the relevant protective circuit,setting the output of operational amplifier high and the memory indicator lamp on. In normal working state,the serial reactor of the high voltage filtering unit presents low impedance with low energy consumption;when there are harmonics,the reactor presents high impedance to limit capacitor current;when harmonics are beyond the permitted values,the capacitor groups are switched off. When the voltage or temperature is over its setting point,the over-voltage and over-temperature protection circuit enables the relevant protective circuit. The device designed has simple circuits and runs reliably.
出处
《电力自动化设备》
EI
CSCD
北大核心
2007年第11期101-103,共3页
Electric Power Automation Equipment
关键词
无功补偿
谐波记忆
自我保护
reactive compensation
harmonic memory
self-protection
