[Xusheng Electronic Technology] What Are the Reasons for Frequent Tripping of the Distribution Box of Full-Color LED Dis

[Xusheng Electronic Technology] LED Full-ColorDisplay ScreenWhat Are the Reasons for Frequent Tripping of the Distribution Box?

Generally, there are four factors for frequent tripping of the distribution box of full-color LED display screens: unreasonable layout of leakage protectors, failure to form effective secondary or tertiary leakage protection within the protection range, certain limitations of the leakage protector itself (unbalanced three-phase power consumption), unreasonable selection of leakage protectors, etc.

1. Unreasonable layout of leakage protectors

Due to the particularity of the installation site of full-color LED display screens and the unavoidable misoperation and refusal to operate of the leakage protector itself, plus the failure to arrange the leakage protector according to the actual power consumption, the main leakage protector trips frequently.

LED display screen solution: in this case, in addition to strengthening management, the leakage protector needs to be reasonably arranged from a technical point of view according to the actual situation.

2. Failure to form effective secondary or tertiary leakage protection within the protection range

The final-stage leakage protector in the switch box is the main protection for electrical equipment. Since there are many metal conductors and wire joints in the full-color LED display screen, if the wire insulation is not very good, it will lead to frequent leakage; some have also added sockets, which in many cases are not equipped with leakage protectors, often causing leakage.

LED display screen solution: only by forming an effective secondary or tertiary leakage protection mode within each protection range can frequent tripping of leakage protectors be effectively reduced.

3. The leakage protector itself has certain limitations (unbalanced three-phase power consumption)

Current leakage protectors, whether electromagnetic or electronic, use magnetically induced voltage transformers to pick up the leakage current in the main circuit of electrical equipment; three-phase or three-phase four-wire cannot be arranged completely balanced in the magnetic ring. The three-phase load of a full-color LED display screen cannot be completely balanced either; under large current or high overvoltage, a certain electromotive force will be induced in the magnetic ring with high magnetic permeability, and when this electromotive force reaches a certain level, it will cause the leakage protector to trip.

4. Unreasonable selection of leakage protector

If the rated leakage operating current used in the switch box exceeds 30mA, or exceeds twice the rated current of the electrical equipment, or a leakage protector with delay type is selected, due to the increase of the rated leakage operating current or the decrease of protection sensitivity, when a leakage fault occurs, the final-stage leakage protector does not operate, and the upper-level leakage protector may operate.

LED display screen solution: the starting current when powering on a full-color LED display screen is often relatively large, and this large current may trip the leakage protector. Therefore, the cabinets of the display screen should be powered on in batches as much as possible. In addition, electromagnetic leakage protectors that are not too sensitive to surge overvoltage and overcurrent should generally be selected; or electronic leakage protectors with a rated current 1.5~2 times larger should be used, but as the final-stage leakage protection, the rated leakage operating current should not exceed 30mA.

keyword: Display Screen

Source of the article:http://www.xusen-pro.com/