Large current transformers usually work in the environment of strong strayflux, 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。
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How to research stray losses and temperature rise on metal parts caused by leakage flux is difficult task for transformer design.