一款0～2000hz交直流通用的真有效值变送器设计-电气技术.pdf

技术与应用 一款0～2000Hz 交直流通用的真有效值 变送器设计 徐国明 曹达 周乾 钱耶兵 （浙江涵普电力科技有限公司，浙江 海盐 3 14300） 摘要　在发电 监测系统中，广泛使用了电压、电流变送器来监测发电 端电压和电流。 目前在国内市场上，交流变送器的输入信号频率一般限制在45～55Hz，无法测量发电 起动阶 段的低频电压电流。本文设计了一款测量发电 端电压电流真有效值的变送器，通过磁平衡式 霍尔电流互感器和AD536 芯片的转换，将输入信号转换成直流电平。此变送器可测量0～ 2000Hz 的电压电流信号，是一款交直流通用的变送器，有效解决了发电 起动阶段低频电压电 流的测量问题。 关键词：真有效值 ；交直流通用 ；变送器 ；磁平衡式霍尔电流互感器 ；AD536 A True RMS Transducer Designed as 0～2000Hz AC-DC Universal X u Guoming Cao Da Zhou Qian Qian Yebing (Zhej iang Harnpu Electric Technology Co., Ltd, Haiyan, Zhej iang 3 14300) Abstract　In the generator monitor system, voltage and current transducer are used widely for monitoring the terminal voltage and current of the generator . Now in domestic market, the input signal frequency of AC transducer is limited to 45Hz to 55Hz. When the generator is in starting stage, the ordinary transducer cannot measure the low frequency voltage and current of generator . This paper designed a transducer which can measure true RMS of the terminal voltage and current of generator . This transducer converts input signal into DC signal by magnetic balance Holzer current transformer and AD536 chip . This transducer can measure 0～2000Hz voltage and current signals, which can measure both AC and DC input signals. This transducer effectively solves the problem of measuring the low frequency voltage and current of generator at start-up stage. Keywords ：true RMS；AC and DC universal ；transducer ；magnetic balance Holzer current transformer ；AD536 发电机在社会生产中起着非常重要的作用，因 路也对输入信号频率有较大限制。受制于这些原因， 此对于发电机的监控非常重要。在发电机监 系统