NO.1, Problems
1, LED display zero line current is too large (up to 1.6~2.4 times between zero current phase current)
2, LED display cable noise, the zero line heating is serious, there is a clear line of electrical fire hidden danger;
3, LED display trip (leakage switch or circuit breaker).

NO.2, The reason of LED display zero current greater than phase current
Three phase current balance, three-phase current vector angle phase difference of 120 degrees. The three-phase can cancel out each other and zero line current is zero.
LED display switching power supply produces 3 harmonic current on power grid greatly (three harmonic current), 3 harmonic current of three-phase zero sequence. Three - phase vector angle consistent, so the 3 harmonic current overlay to zero line.
Usually, the 3 harmonic current content of switch power between 55%~80%, make LED display produced some strange phenomenon: "phase current is much smaller than the zero line / the zero line current is close to the sum of phase current lines"

NO.3, The solution of large zero line current
Special LED display zero sequence filter (ZSFGD Series) is aimed at LED display zero line current characteristics. Good Power has ten years zero line current electrical light treatment experience and their breakthrough of foreign technology is the best product to solve the current problems of LED display.
Zero phase filter is connected with the LED display screen in parallel, the 3 harmonic current through the zero sequence filter, zero sequence filter will produce magnetic flux. After the detection of the calculation, in the device fabricated inside the magnetic flux equal / opposite offsets, thereby filtering 3 harmonic current and eliminating the zero line current.

NO.4, What are the benefits of zero line filter?
1, it can reduce the LED display screen zero line current more than 90%;
2,it avoids the cable wire hot, reduce the loss, savings the overall electricity of 3%~8%;
3, it avoids the insulation of the zero line aging and short circuit caused by electrical fire.