Frequency changer by means of electric current for calculation limitation.

因变频器以电流为计算限制。

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The paper introduces a transformation by PLC and frequency-changer in the light of current lashing problem of drawing-oil tube cleaning machine in oil field enterprises.

本文针对油田企业中抽油管清污机中存在的冲击问题，用PLC、变频器等对其控制进行了改造。

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After illustrating the operation theory of six pulse converter, author gives the calculating method of UHVDC transmission parameters such as operating power, voltage, current and tap changer range.

在此基础上确定了溪洛渡—株洲特高压直流输电工程换流变压器的额定功率、电压、电流和分接头的变化范围等参数。

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The current White House says that such unconventional natural gas is such a game-changer and that it requires more federal oversight while a Romney presidency would continue to let the states supervise the development of gas drilling.

FORBES: Can Shale Gas Build Tomorrow's Energy Bridge?