grade of transmission的意思|示意

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。

It briefly presents the application instance of grade X80 pipeline steel in foreign country gas transmission pipeline.

简单介绍了X80级管线钢在国外输气管道上的应用情况。

First selection of grade X80 pipeline is suggested on large size high pressure gas transmission pipe in the future.

建议在未来大口径高压输气管线中优先选用X80级管线钢管。