source:other news release time:2023-11-16 Hits: Popular:led screen wholesaler
The current on the zero line exceeding the phase line current is a huge hidden danger, as there is no overcurrent protection device on the zero line, and of course, there is no alarm prompt. So, the zero line heating is very serious, and over time, it can directly cause a fire. It also seriously affects the lifespan of transformers and cables
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The main cause of excessive zero line current is the third harmonic, which is generated by a switching power supply. The process of converting AC 220V to DC 5V generates harmonics, mainly the third harmonic. Secondly, the LED display screen has always been a dynamic picture, and the three-phase will not balance and will also generate zero line current.
For screen areas exceeding 100m ² For the display screen, the engineering party should suggest that Party A eliminate the zero line current. The larger the screen body, the more attention should be paid, and this cost cannot be saved
3. Handling method
For displays below 100 square meters, option 1 can be used, which is to choose 4+1 national standard copper wire. Overall, for option 3), the cost of the solution is 40% higher than that of option 2)
The harm of zero line current on displays with an area of over 100 square meters is so great that it has to be taken seriously! Looking at the pictures of the fire display screen, it is basically ignited in the form of a fuse wire from the bottom horizontally. In fact, the current of the neutral wire of the horizontal main cable is twice that of the phase wire, while the copper area of the neutral wire is not correspondingly twice that of the phase wire. The overheating of the neutral wire serves as a fuse wire. Solution: Firstly, increase the copper area of the zero line; The second is to install a zero line current canceller. But both have a common problem of low power factor in grid power.
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