With the expansion of power grid and the increase of the transmission voltage grade, the status of relay protection in power system is becoming more and more important.

电网规模的扩大、输电电压等级的提高，使得继电保护在电力系统中的地位变得更加重要。

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Revenue-grade metering would encourage motorists to charge their cars overnight, rather than in the evening when the grid is at peak capacity.

FORBES: ComEd Wants To Know Where You're Charging Your Car