In the use of LED displays, especially full-color displays, they will encounter the air switch tripping. Many users may not understand the reasons. The editor will collect and organize to explain to you when you encounter the air of the LED display. What should I do if the switch frequently trips?
First, the layout of the leakage protector is unreasonable. Due to the particularity of the installation of the LED full-color display, such as line damage, etc., and the movement and movement of the leakage protector itself, this will cause the leakage protector to trip frequently.
Solution: In addition to strengthening management, the leakage protector needs to be reasonably arranged according to the actual situation. The leakage protector is used as a total protection to prevent electrical fire hazards and electrical short-circuits. Its rated leakage current can be selected from 200 to 500mA, and the rated leakage time can be selected from 0.2 to 0.3s.
Second, because there is no effective secondary or tertiary leakage protection in the protection range, the last-stage leakage protector in the switch box is the main protection of the electrical equipment. If the last-stage leakage protector is not installed, damaged or selected Improper, it may cause frequent tripping of the superior leakage protector.
Solution: An effective secondary or tertiary leakage protection mode is formed in each protection range to effectively reduce the frequent tripping of the leakage protector.
Third, the current leakage protectors we currently use, whether electromagnetic or electronic, use magnetic induction voltage transformers to pick up the leakage current in the main circuit of electrical equipment. Three-phase or three-phase four-wire is impossible in a magnetic ring The layout is completely balanced. The three-phase electricity load of the LED full-color display screen cannot be completely balanced. Under high current or high overvoltage, a certain electromotive force will be induced in the magnetic ring with high permeability, which is so large To a certain extent, it will cause the leakage protector to trip. In addition, the leakage protector has an area of uncertain operation between the rated leakage operating current and the rated leakage non-operating current. When the leakage current of the leakage protector fluctuates in this area, it may cause the leakage protector to trip irregularly. .
Solution: Reasonably arrange the leakage protector to reduce the protection scope of the secondary or tertiary leakage protector.
Fourth, the unreasonable selection of the leakage protector may also cause the circuit breaker to trip. The rated leakage action current used in the switch box exceeds 30mA or is more than twice the rated current of the electrical equipment, and the leakage protector with time delay is selected, due to the increase of the rated leakage action current or the protection sensitivity The drop of the upper level leakage protector may act, which will cause a trip.
Solution: Correctly select wiring and leakage protector.
To sum up, we can know that the LED full-color display air switch tripping is caused by many reasons. Therefore, in order to solve the problem of frequent leakage, it is first necessary to arrange a leakage protector reasonably and reduce the protection of the secondary or tertiary leakage protector. Range, the correct choice of wiring and leakage protector. In addition, we also need to strengthen power management and improve the comprehensive technology of power users, which can not only improve the safety of power use, but also solve the problem of frequent tripping of leakage protectors.
