three-position relay

Application of the algorithm ensures that the result of Ucos φ is accurate, convergent and the true expressions of the voltages and currents in the site of relay when power swing and three-phase short-circuit fault happens at the same time.

用此算法求出的Ucosφ数值精度高，收敛性好，更真实地反映了电力系统振荡过程中发生三相短路时保护安装处电压和电流的变化；

The organisers of the Beijing Olympics said the torch relay would also be suspended for three days.

北京奥组委表示，奥运火炬传递将暂停三天。

We plan to exchange the microwave of the three base stations, and install the electrical equipment of relay station.

明天的计划准备对调三个基站的微波、安装中继站的电源设备。

For the tumbling loop, the servo actuator adopts three-position relay control fashion to make the loop be stable by using the relay control circuit, the three-position and five-passage valve and the gas amplification device.

对于滚转稳定回路，采用三位置继电控制舵，通过继电放大器、三位五通阀和气动放大器来控制舵面的偏转，以此来实现滚转稳定。

Electric braking on the right bank of the Three Gorges power station on the relay the impact of downtime

三峡右岸电站电气制动停机对继电保护的影响

China has also suspended the Olympic torch relay during the three-day mourning period.

默哀期间，股市停盘，奥运圣火也停止传递三天。