As one of the connections for three phase induction motor to operate from single phase supply, SEMIHEX connection can enable three phase induction motor have approximated symmetrical operation.

作为三相感应电动机单相运行的一种特殊接法，SEMIHEX连接可使三相感应电动机在单相电源上接近对称运行。

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It's significant to study the regulation of active power of three-phase synchronous generator by way of the alternating power source of three-phase industrial frequency.

三相同步发电机作为三相工业频率的交流电源，研究其有功功率调节具有重要意义。

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A three-phase alternating current parameters instrument to be used in industry is designed. It can measure the voltages, currents, power factors of each phase of three-phase alternating current.

设计开发一种工业用三相交流电参数仪，能够测得三相交流电各相的电压、电流、功率、功率因子等参数；

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Under a tentative peace deal, al-Bashir agreed in November to a three-phase U.N. plan to strengthen the overstretched, 7, 000-strong African Union force in Darfur.

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The play-based Foundation Phase for three to seven-year-olds was due to be used in primary schools across Wales from September.

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After a three-month checkout phase, day-to-day operations will be turned over to the U.S. Geological Survey, which intends to make images and data free on the Internet as in previous Landsat missions.

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