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。
2
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.