Primary wires. Low voltage wires used to connect the electrical components of the primary circuit.

初级导线。低压导线用来连接初级回路的各个部件。

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Analyses results show that the materials, tension and rigidity of wires, speed of trains, wave speed, and lift forces are primary factors that affect fatigue life of contact wires.

分析结果表明，接触导线线质、张力和刚度以及列车运行速度、波动传播速度和抬升力是影响导线疲劳可靠性的主要因素。

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ConEdison, the largest utility company in the region, noted that Hurricane Sandy knocked down more than 100, 000 primary electrical wires and thousands of secondary wires.

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