Large current transformers usually work in the environment of strong stray flux, so some effective methods must be taken to shield them from electromagnetic interference.
大电流互感器通常工作于强杂散磁场环境，必须采取有效措施来保护其不受外界电磁干扰。
A cut-off plane valve applicable for the hydraulic shield in the coal mine is introduced, which has the feature of high pressure, large flux and small handling moment.
介绍了一种适应于煤矿井下液压支架使用的高压、大流量、操作力矩小的先导式平面截止阀，并详细介绍了其工作原理、结构和使用性能特点。
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