voltage grade的用法和樣例：
例句
- Adoption of higher voltage class makes more rigor request for allowable value of switching overvoltage of the transmission lines.
電網(wǎng)電壓等級的提高對輸電線(xiàn)路操作過(guò)電壓允許值提出了更加嚴格的要求。 - With the transmission line voltage class escalating, ultra-high speed protection becomes the hot spot in the current researches.
隨著(zhù)輸電線(xiàn)路電壓等級的不斷升高，基于行波原理的故障測距和超高速線(xiàn)路保護已經(jīng)成為目前研究的熱點(diǎn)。
