数字调制式一体化光纤电力传感器的研究

提出了数字调制式一体化光纤电力传感器,应用罗氏线圈作为电流检测单元,精密电容分压器作为电压检测单元,自具型电源直接从系统提取电能为高电位端的数字处理单元供电,测量信息由光纤传到地电位端。整机准确度可达到0. 5 % ,用做系统保护时,在很大的测量范围内可以保持较高的精度。系统体积小、成本低,不受外界干扰,可与微机直接相连,是电器智能化系统理想的检测单元。
关键词: 　数字调制; 　光纤电压电流传感器; 　检测单元
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