超音波法液位元元元元元元测定
ultra-sonic method of liquid meaduremert
选相元件
Phase selection
fault phase selector element
Phase-selector
fault phase selection element
fault type selection element
fault phase selection
fault phase selector
phase selector
faulty phase selector
综合选相元件
synthetic fault phase selection
不完全裂相横差保护
incomplete split phase transverse differential protection
传统裂相横差保护
traditional (complete) split phase transverse differential protection
分裂相对差集
splitting relative difference set
and phrases