Tesla Motors, the maker of battery-powered cars, recently announced it had been forced to delay production of its all-electric Model S sedan, close two offices and lay off workers.
The classic analysis of high-frequency (HF) protection only takes account of the channel delay effect of HF signal, neglects the delay effect of electric traveling wave.
高频保护传统分析方法仅考虑高频信号在通道中的延时效应，没有分析电气量的行波延时效应。
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Time relay is a use of electromagnetic principle or mechanical theory to realize delay control control electric appliance.