The phase difference often needs to be measured between two signals with the same frequency in power system, such as power voltage and power current signals.

在电力系统中常常需要对两个同频率信号(如工频电压和工频电流)之间的相位关系进行准确的测量。

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The intelligent power voltage regulator based on PLC control technology was designed.

设计了基于PLC控制技术的智能控制电力调压器。

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The paper discusses the technique of increasing surface power voltage class from 380v to 660v.

本文就地面供电电压等级由380v提高到660v电压技术问题进行探讨。

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And these electrodes are then connected to a variable voltage power supply.

这些电极然后,和一个变压电源连接起来了。

麻省理工公开课 - 固态化学导论课程节选

New York City, electric power is transmitted by high voltage cables encased in steel pipelines to electric substations where the power is converted to low voltage feeders supplying about 55 distribution networks.

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Digitizing and consolidating analog power sources that require a separate wire for each voltage, Power-One will ultimately be a major beneficiary of this trend.

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The authorities blame unexpected storms, tree branches falling on high-voltage power lines (as in the Italian example) and other acts of nature.

ECONOMIST: Why do the lights keep going out?