摘要
提出一种利用全球定位系统（ＧＰＳ）和故障产生的瞬态信号的输变电系统保护新技术。在这种方案中，包括一个故障瞬态信号检测系统及一套通信装置。通信装置通过ＣＶＴ（电容电压互感器）的高压耦合电容器与线路连接。继电器检测故障产生的高频电压瞬态信号，并记录另一条母线故障的初始行波抵达该母线的时间。通信装置在系统内各相关继电器之间传送和接收就地信息的编码数字信号。每个变电站内的继电器通过将就地测得的ＧＰＳ时间与接收到的相邻变电站的时间进行对比，来确定故障位置。本文通过广泛的仿真研究说明该方案的可行性。
This paper presents a new technique for the protection of power transmission systems by using the Global Positioning System (GPS) and fault generated transients. In the scheme, the relay contains a fault transient detection system together with a communication unit, which is connected to the power line through the high voltage coupling capacitors of the CVT. Relays are installed at each busbar in a transmission network. These detect the fault generated high frequency voltage transient signals and record the time instant corresponding to when the initial travelling wave generated by the fault arrives at that busbar. The communication unit is used to transmit and receive coded digital signals of the local information to and from the associated relay(s) in the system. At each substation, the relays determine the location of the fault by comparing the GPS time stamps measured locally with those received from the adjacent substations. Extensive simulation studies presented in the paper demonstrate the feasibility of the scheme.
