CAJ | 학술논문

在GIS检测系统中,电荷放大器检测到的信号中往往含有较多的共模干扰,常用的电荷放大器满足不了要求.基于此问题,利用电荷放大器的基本原理,设计一种三运放差分放大电路.该电路由3个电荷运算放大器组成,电路中确定了运算放大器的型号以及主要器件和参数.经过Multisim仿真和硬件电路实验检测证明,该电路能有效地抑制GIS闪络故障中的共模噪声,而且拥有较宽的工作频率.因此,该电路可以稳定的工作在频率为10~180 kHz的范围内,而且能有效地抑制信号中的共模信号干扰,具有失真小、动态范围大等特点.
재GIS검측계통중,전하방대기검측도적신호중왕왕함유교다적공모간우,상용적전하방대기만족불료요구.기우차문제,이용전하방대기적기본원리,설계일충삼운방차분방대전로.해전로유3개전하운산방대기조성,전로중학정료운산방대기적형호이급주요기건화삼수.경과Multisim방진화경건전로실험검측증명,해전로능유효지억제GIS섬락고장중적공모조성,이차옹유교관적공작빈솔.인차,해전로가이은정적공작재빈솔위10~180 kHz적범위내,이차능유효지억제신호중적공모신호간우,구유실진소、동태범위대등특점.
In GIS detection system,since the signal detected by charge amplifier often contains some common-mode inter-ference,the common charge amplifier can't meet the requirement. Based on this problem,a three-operational-amplifying dif-ferential amplification circuit was designed according to the fundamental of the charge amplifier. The circuit consists of three charge amplifiers,in which the type,the main devices and parameters of the operational amplifier are determined. The circuit can restrain common-mode noise in GIS flashover fault effectively and has wide operating frequency,which is verified by Multi-sim simulation and testing of the hardware circuit. This circuit can work at the range of 10~180 kHz stably,restrain the common-mode signal interference in signal effectively,and has the characteristics of low distortion and wide dynamic range.