Operating principle of current transformers: They convert high primary current into a smaller secondary current for measurement and protection purposes. They work in a short-circuit state, with the primary winding connected in series with the line and the secondary winding connected in series with the instrument. The secondary current is inversely proportional to the number of turns in the winding, and the secondary winding must never be open-circuited, or high voltage could occur, which is dangerous.
电流互感器的工作原理：将一次侧大电流转换为二次侧小电流供测量和保护使用，工作在短路状态，一次绕组与线路串联，二次绕组与仪表串联，二次电流与绕组匝数成反比，二次绕组绝对不能开路，否则会产生高电压危及安全
Structural features of current transformers: The primary winding has fewer turns and a thicker wire, while the secondary winding has more turns and thinner wire. The structure must meet thermal and electromagnetic stability requirements, and the secondary load impedance should be low to ensure safe operation under short-circuit conditions.
电流互感器的结构特点：一次绕组匝数少、线径粗，二次绕组匝数多、线径细，结构需满足热稳定和电动稳定要求，二次负载阻抗低，保证短路运行安全。
Working requirements of current transformers: The secondary must be closed (short-circuited). Open-circuiting can cause core saturation and generate high voltage, endangering equipment and personnel. During normal operation, the magnetic flux density is low, but it increases significantly during a short circuit.
电流互感器的工作要求：次级必须闭合（短路），开路会导致铁芯饱和、高压产生，危及设备和人员安全，正常工作时磁通密度低，短路时磁通密度大幅增加。
电流互感器的工作要求：次级必须闭合（短路），开路会导致铁芯饱和、高压产生，危及设备和人员安全，正常工作时磁通密度低，短路时磁通密度大幅增加。
Uses of current transformers: They are used to measure high currents, protect relays and instruments, isolate primary and secondary systems, and ensure safety.
电流互感器的用途：用于测量大电流、保护继电器和仪表，隔离一次系统与二次系统，保证安全。
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