LED display zero line current is greater than phase line current
Three-phase current balance, three-phase current vector angle difference of 120 degrees, three phases can cancel each other, zero line current is zero.
　　 The LED display is powered by the switching power supply. The switching power supply generates a large 3rd harmonic current ( third harmonic current ) to the power grid . The 3rd harmonic current is zero sequence chopping current, and the three-phase vector angle is the same, so the 3rd harmonic The wave current is superimposed on the zero line.
Usually, the 3rd harmonic current of the switching power supply is between 55% and 80% , which causes some strange phenomena on the LED display : "The phase current is much smaller than the neutral current / the neutral current is close to the sum of the phase currents "
Zero line high current solution
　　 The LED display dedicated zero-sequence filter (ZSFGD series ) is a good work for the zero-line over-current characteristics of LED display , the experience of light-to-electrical decade zero-line current processing and breakthrough in foreign technology. It is the best product to solve the problem that the zero line current caused by LED display is too large. The zero-sequence filter is connected in parallel with the phase line of the LED display . After the third- order harmonic current passes through the zero-sequence filter, the zero-sequence filter generates magnetic flux. After the detection and calculation, the device is made equal in size or opposite in direction. The magnetic flux is cancelled to filter out the 3rd harmonic current and eliminate the neutral current.
What are the benefits of a zero-line overcurrent filter?
1. It can reduce the current of 90% or more of the LED display zero line ;
2 , to avoid the cable wire is hot, reduce losses, the overall saving electricity costs 3% ~ 8%;
3. Avoid aging of the insulation zero wire, causing electrical fire caused by short circuit.
Zero line overcurrent filter product features
Taking the ZSFGD type zero sequence filter as an example, compared with the traditional solution ( zero line current blocker ), it has the following characteristics:
1. Installation method: The neutral current blocker is connected in series on the zero line. The installation requires the main switch of the transformer to be powered off. The zero sequence filter is connected in the three-phase four-wire. The installation only needs to stop the LED display .
2 , national standards: the zero-line current blocker does not meet the national standards, the zero line is not allowed to serially connect any device specifications / zero-sequence filter in line with all national standards ;
3 , personal safety: Zero line current blocker has voltage on the zero line, human contact zero line has electric shock hazard / zero sequence filter zero line no voltage, no contact with human zero line ;
4. Display device safety: The zero-line current blocker device is damaged, the full-color LED display screen has no zero line, the display electrical component burnout / zero sequence filter is damaged, the display is dead, and it cannot be started ;
5 , electrical short circuit safety: The zero line current blocker short circuit inside the display, because the zero line impedance becomes much larger, the short circuit current becomes smaller, the leakage time becomes longer, the upper switch does not trip the surface and causes the electrical fire / zero sequence filter A short circuit occurs inside the display, and the upper switch normally trips without danger.
6 , zero line current elimination effect: Zero line current blocker zero line current filtering rate is lower than 60% / zero sequence filter zero line current filtering rate is higher than 90% .
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