真有效值電量傳感器是針對平均值測量法不能準確測出其有效值而設計的。有效值又稱均方根值（rms）。利用此原理開發的WB 系列真有效值電量隔離傳感器有兩大類： 一類是單路交流電流、電壓及交直流通用輸入， 模擬量輸出的真有效值轉換電量隔離傳感器； 另一類為多參量組合型的智能變送器， 其輸入單相或三相交流電壓、電流， 輸出有電壓、電流、有功、無功、功率因數、頻率等， 數據接口為RS- 485 總線。文中給出了交/ 直流電流/ 電壓型WB 系列真有效值電量隔離傳感器的原理框圖及其直流電壓輸出型、直流電流輸出型和頻率輸出型的應用示例。
關 鍵 詞 ： 電量隔離傳感器； 真有效值； 平均值； 原理； 應用
Abstract: TRMS electricity isolated sensor is designed for test that can not be tested exactly by average test method, RMS is also root mean square. By this principle, we develop the WB TRMS electricity isolated sensor, The sensor divide into two classes, one is single AC current, voltage and AC/ DC input with analogue output, other is multi- parameter intelliget transmitter, It has single -phase or three-phase AC voltage、 current input, it can output voltage, current, effective power, not-effective power, power factor, frequency
and etc, the interface is RS- 485 bus, In this writings, we give the principle scheme of AC/ DC current、voltage WB TRMS electricity isolated sensor and application example of DC voltage DC current and frequency output.
Key Words: Electricity isolated sensor, TRMS, Average, Principle, Application