注入信号精确谐振测量配电网电容电流新技术

针对天津独流减河除险加固工程的实际情况和计算机监控系统网络架构的具体需求，应用施耐德TSX SCP114通信卡，结合MODBUS协议的特点，对监控系统的现地通信单元进行了组态设计;并从数据采集和数据输出2个方面对TSX SCP114的通信机理进行了深入研究，合理设计通信函数，提高了系统通信性能。

A Novel Technique of Capacitive Current Resonance Measurement with Signal Injected for Distribution Networks

A novel method of capacitive current measurement is proposed for distribution networks. An adjustable reactor is connected in series with the open-delta secondary of a zero sequence voltage transformer. The distribution network resonance frequency is sought by injecting a current signal with variable frequency. By adjusting the reactor, another resonance frequency is also sought. The distribution network capacitance and capacitive current to ground is then calculated using the two resonance frequencies. The measuring method has eliminated the influence of the voltage transformer leakage impedance on measurement. The measuring device developed has been tested in laboratory and real distribution networks. The results obtained show that the method proposed is highly accurate, capable of testing in real-time, and without interrupting power supply. It can be applied in distribution networks with neutral point unearthed or with Petersen-coil following-setting.