What is the effect of excessive current on the LED full-color display?

What effect does excessive current have on the LED full-color display? First of all, let's understand the reason for the excessive current of the LED full-color display:



1. Three-phase current balance, the three-phase current vector angle difference is 120 degrees, the three phases can cancel each other, and the zero line current is zero.



2. 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 a zero-sequence ghost current, and the three-phase vector angle is consistent. , So the 3rd harmonic current is superimposed on the neutral line.



3. Usually the 3rd harmonic current content of the switching power supply is between 55%~80%, causing some strange phenomena in the LED display: 'The phase line current is much smaller than the neutral line current / the neutral line current is close to the phase The sum of line currents'.



So let's take a look at the effect of excessive current on the LED full-color display:



1. The zero line current of the led display is too large (the zero line current is between 1.6 and 2.4 times the phase line current);



2. The LED display cable is noisy, the neutral line is very hot, and the neutral line has obvious electrical fire hazards;



3. The LED display trips (leakage switch or circuit breaker).