數(shù)字調(diào)制式一體化光纖電力傳感器的研究

提出了數(shù)字調(diào)制式一體化光纖電力傳感器,應(yīng)用羅氏線圈作為電流檢測單元,精密電容分壓器作為電壓檢測單元,自具型電源直接從系統(tǒng)提取電能為高電位端的數(shù)字處理單元供電,測量信息由光纖傳到地電位端。整機(jī)準(zhǔn)確度可達(dá)到0. 5 % ,用做系統(tǒng)保護(hù)時,在很大的測量范圍內(nèi)可以保持較高的精度。系統(tǒng)體積小、成本低,不受外界干擾,可與微機(jī)直接相連,是電器智能化系統(tǒng)理想的檢測單元。
關(guān)鍵詞: 　數(shù)字調(diào)制; 　光纖電壓電流傳感器; 　檢測單元
Abstact : 　A combined digital current and voltage transducer for power system has been developed. A Rogowski coil and a capacitive voltage divider are used respectively for the line current and voltage measurements. Active electronic components are used to modulate signal , and power supply for these components is drawn from line via an auxiliary current transformer. Measurement information is transmitted to the remote receivers by optical fibers. The whole sys2 tem meets 0. 5 % accuracy for metering and provides large dynamic
range coupled with good accuracy for protective relaying purpose. The system proposed is small in size , low in cost , disturbance2 proof , and easy to connect to upgrade computer. So it is an ideal detection unit for intelligent apparatus.
Key words : 　digital modulation ; optic2fiber current and voltage transducer ; detection unit