Polyethylene has been widely used in power cables and electrical equipments because of its excellent insulating and mechanical properties.
聚乙烯因其良好的绝缘性能和机械性能，广泛应用于电力电缆及电气设备绝缘领域。
Breaks of the metro traction substation are important equipments that have frequent mechanical and electrical actions, as a result, they are prone to failure.
地铁牵引变断路器是地铁牵引供电系统的重要设备，地铁牵引变断路器的机械和电气动作频繁，易于发生故障。
Some concepts such as using VAV Box and monitor system for important mechanical and electrical equipments with no controlling functions are proved to be very effective.
其中采用变风量空调箱的空调系统以及对一些重要机电设备只监不控的概念经过工程上的实践证明，是非常有效的。
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