【摘要】 使用高频技术测量局部放电时，由于换流变内部存在干扰，会导致监测效果不良。为达到良好监测效果，需要排除干扰。本文通过对干扰源进行分析，确定主要干扰为12脉动换流阀在晶闸管导通和关断过程中产生。通过分析谐波特征，确定从时域上对波形进行鉴别后剔除干扰。本文设计了一套对信号进行去噪、滤波、放大等处理信号调理电路，使信号电平便于AD电路分析。再设计可排除干扰的AD转换电路，将模拟信号转为数字信号，通过处理器对转换后的信号进行剔除。最后对抗干扰技术的效果验证，排除干扰后的波形满足要求。更多还原

【Abstract】 When measuring partial discharge using high frequency technology, the monitoring effect will be poor due to interference within the conversion. In order to achieve a good monitoring effect, the interference needs to be excluded. By analyzing the interference source, the main interference is the 12 pulsation converter valve generated during thyristor conduction and shutdown. By analyzing the harmonic features, identifying the waveforms from the time domain were determined to remove the interference. This paper designed a set of processing signal conditioning circuits for denoising, filtering and amplification to make the signal level facilitate AD circuit analysis. The AD conversion circuit can exclude interference, turns the analog signal to a digital signal, and removes the converted signal through the processor. The effect of the anti-interference technology and the waveform after excluding the interference meets the requirements.更多还原