一、涡流产生的原理

　　1、 The principle of eddy current generation

　　涡流是由于导体在变化的磁场中，或者导体相对于磁场运动时，导体内部产生感应电流的现象。这些感应电流在导体内自行闭合成旋涡状，因此被称为涡流。在电缆桥架中，当敷设的单芯电缆通以交流电时，会在电缆周围产生交变磁场。如果电缆桥架由导电材料制成或包含导电部分，并且置于这个交变磁场中，就会在电缆桥架导体内部产生涡流。

　　Eddy current is the phenomenon of induced current inside a conductor when it is in a changing magnetic field or when it moves relative to the magnetic field. These induced currents self close into vortices within the conductor, hence they are called eddy currents. In cable trays, when a single core cable is laid with alternating current, an alternating magnetic field is generated around the cable. If the cable tray is made of conductive materials or contains conductive parts, and is placed in this alternating magnetic field, eddy currents will be generated inside the conductors of the cable tray.

　　二、涡流的危害

　　2、 The hazards of eddy currents

　　涡流在导体内部产生热量，导致电缆桥架和附近构件的温度升高。这不仅会造成能源浪费，还可能引发火灾等隐患。此外，涡流还会使磁场减弱，导致电气设备效率降低，容量不能充分利用。

　　Eddy currents generate heat inside conductors, causing an increase in temperature of cable trays and nearby components. This not only causes energy waste, but may also pose safety hazards such as fires. In addition, eddy currents can weaken the magnetic field, leading to a decrease in the efficiency of electrical equipment and an inability to fully utilize its capacity.

　　三、避免涡流的措施

　　3、 Measures to avoid eddy currents

　　为了避免电缆桥架产生涡流，可以采取以下措施：

　　To avoid eddy currents in cable trays, the following measures can be taken:

　　?选用合适的材料?：使用非导磁材料（如304不锈钢）或低电阻率的导体材料（如铜、铝）来制作电缆桥架，以减少涡流的产生。

　　Select appropriate materials: Use non-magnetic materials (such as 304 stainless steel) or low resistivity conductive materials (such as copper and aluminum) to make cable trays to reduce the generation of eddy currents.

　　?优化电缆敷设方式?：保证电缆间距合理，采用交叉敷设等方式降低磁场干扰。同时，使用合适的夹具或尼龙绑带固定电缆，避免使用铁夹子直接绑扎单芯电缆，以减少涡流的形成。

　　Optimize cable laying method: Ensure reasonable cable spacing and use cross laying and other methods to reduce magnetic field interference. At the same time, use appropriate fixtures or nylon straps to secure the cables and avoid using iron clips to directly tie single core cables, in order to reduce the formation of eddy currents.

　　?改善电缆桥架敷设环境?：尽量避免在强电磁场附近敷设电缆桥架。如果无法避免，则应考虑采用屏蔽电缆或增加屏蔽层来减少外部磁场的影响。

　　Improve the laying environment of cable trays: Try to avoid laying cable trays near strong electromagnetic fields as much as possible. If unavoidable, shielded cables or additional shielding layers should be considered to reduce the impact of external magnetic fields.

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