摘要
针对传统局部放电信号采集系统采样率低、采样率不可灵活配置导致局部放电脉冲信号时域波形特征提取误差较大的问题,设计了一种用于特高频传感器的局部放电信号并行采集系统。系统以Xilinx 7系列FPGA为主控芯片、四片最高采样率为250 MHz的ADC芯片通过分时交替并行采样技术实现最高1 GHz的采样率。系统在特高频传感器的基础上,主要分析并校正了由分时交替并行采样技术引入的偏置失配误差、增益失配误差和时延失配误差。仿真及实验结果表明,该系统能够采集到高精度的局部放电信号包络,并且在100 MHz带宽范围内无杂散动态范围(SFDR)提高到35 dB。
Aiming at the problem that the traditional partial discharge signal acquisition system has a low sampling rate and inflexible configuration of the sampling rate, which results in a large error in the extraction of partial discharge pulse signal time-domain waveform characteristics, a parallel acquisition system for partial discharge signals based on a UHF sensor is designed. The system used Xilinx 7 series FPGA as the main control chip, and four ADC chips with the highest sampling rate of 250 MHz through time-interleaved parallel sampling technology to achieve the highest sampling rate of 1 GHz. Based on the UHF sensor, the system mainly analyzes and corrects the offset mismatch error, gain mismatch error and delay mismatch error introduced by the time-interleaved parallel sampling technology. Simulation and experimental results show that the system can collect high-precision partial discharge signal envelopes, and the spurious-free dynamic range(SFDR)is increased to 35 dB in the 100 MHz bandwidth.
作者
代少升
刘仁光
刘凯
DAI Shaosheng;LIU Renguang;LIU Kai(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Chongqing Key Laboratory of Signal and Information Processing,Chongqing 400065,China)
出处
《传感技术学报》
CAS
CSCD
北大核心
2021年第8期1014-1020,共7页
Chinese Journal of Sensors and Actuators
基金
重庆邮电大学校企合作项目(SET2019062700)。
