The further study on the relation between the temperature and voltage of the electric underground cables provides a guide for the optimal arrangement of the cable.

为进一步研究直埋敷设在地下的电缆的温度和电压之间的关系和实际的电缆安全运行提供了数据。

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There are several alternate means of transmitting electric power, for example, by alternating or direct current, overhead or underground cable, and all over a wide range of voltages.

有多种送电途径可选择，例如由交流或直流，架室线或地下电缆送电并有各种电压等级。

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At present, we use wire communication underground coal mine in our country. Information is transmitted by electric cable. When the accident happened, the communication is discontinued at once.

目前我国煤矿井下通讯基本上是有线装置，依靠电缆传输信息，一旦发生事故，通信马上中断。

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