This paper describes a prototype power delivery system developed for high voltage electronic current transformer （ECT） that uses laser light to transfer power to and communicates with the primary converter. The desi...This paper describes a prototype power delivery system developed for high voltage electronic current transformer （ECT） that uses laser light to transfer power to and communicates with the primary converter. The design is based on optical-to-electrical power converters, solid-state diode lasers and optical fibers. Command signals are transmitted via the same up-fiber used to send power from secondary power supply to primary converter. The upward data transmission is completed during the brief interruption of power delivery without affecting steady power-supply. A simple comparator added to the primary converter can take the command data. Experimental results show that the fibers can provide reliable up-link for data transmission at 200 kb/s from the secondary to the primary converter. Based on the delivery system, the secondary converter can control three auxiliary channels to provide additional information. These monitoring channels are used in a time-multiplexing mode to provide information about the operation temperature, voltage and current at the remote unit for monitoring the ECT. This preventive maintenance or built-in test can increase reliability by giving early warning for necessary maintenance request.展开更多
提出了以微型电流互感器检测耦合电容器电流,再将电流信号传输至控制室转换为与一次电压成正比的二次电压信号来构成电子式电压互感器(electronic voltage transformer,EVT)的技术方案,详细分析了新型高压EVT的传感原理及特点,建立了EV...提出了以微型电流互感器检测耦合电容器电流,再将电流信号传输至控制室转换为与一次电压成正比的二次电压信号来构成电子式电压互感器(electronic voltage transformer,EVT)的技术方案,详细分析了新型高压EVT的传感原理及特点,建立了EVT的一次侧等值电路,推导出其误差公式,并分析了电网频率、电容器温度及二次负载对一次侧误差的影响,且对所研制的高压EVT进行了高压试验,结果表明,新型EVT具有结构简单、体小质轻、绝缘性能好、抗干扰能力强、测量准确度高等优点。展开更多
基金Project supported by the National Natural Science Foundation of China （Grant No.50447006）
文摘This paper describes a prototype power delivery system developed for high voltage electronic current transformer （ECT） that uses laser light to transfer power to and communicates with the primary converter. The design is based on optical-to-electrical power converters, solid-state diode lasers and optical fibers. Command signals are transmitted via the same up-fiber used to send power from secondary power supply to primary converter. The upward data transmission is completed during the brief interruption of power delivery without affecting steady power-supply. A simple comparator added to the primary converter can take the command data. Experimental results show that the fibers can provide reliable up-link for data transmission at 200 kb/s from the secondary to the primary converter. Based on the delivery system, the secondary converter can control three auxiliary channels to provide additional information. These monitoring channels are used in a time-multiplexing mode to provide information about the operation temperature, voltage and current at the remote unit for monitoring the ECT. This preventive maintenance or built-in test can increase reliability by giving early warning for necessary maintenance request.
文摘提出了以微型电流互感器检测耦合电容器电流,再将电流信号传输至控制室转换为与一次电压成正比的二次电压信号来构成电子式电压互感器(electronic voltage transformer,EVT)的技术方案,详细分析了新型高压EVT的传感原理及特点,建立了EVT的一次侧等值电路,推导出其误差公式,并分析了电网频率、电容器温度及二次负载对一次侧误差的影响,且对所研制的高压EVT进行了高压试验,结果表明,新型EVT具有结构简单、体小质轻、绝缘性能好、抗干扰能力强、测量准确度高等优点。
