Guide: Why is the LED full color display tripping frequently? The following is a simple analysis of frequent tripping of LED full-color display. Hope to solve your LED full color display tripping problem.
1.The layout of the leakage protector is unreasonable
Due to the special characteristics of the LED full-color display installation site, such as wiring errors, broken lines, damage to the leakage protector in the switch box, some electrical appliances did not pass through the switch box, and the inevitable misoperation of the leakage protector itself. And refusal to move, together with the fact that the earth leakage protector is not arranged according to the actual electricity consumption situation, causing the total earth leakage protector to trip frequently.
In addition to strengthening management in this case, it is necessary to reasonably arrange the leakage protector from a technical perspective according to the actual situation. The leakage protector on the main power supply of the incoming line can be mainly used as the overall protection against the potential danger of electrical fire and electrical short circuit, and also the backup protection of each small leakage protection range. Its rated leakage operating current can be between 200 ～ 500mA. Choose, the rated leakage action time can be selected from 0.2 to 0.3s. In this way, the influence of the surge voltage, surge current, and electromagnetic interference on the total leakage protector can be greatly reduced, and the selectivity and reliability of the operation of the total leakage protector can be improved. If the secondary leakage protection within the scope of each leakage protection can be effectively protected, the probability of frequent trips of the total leakage protector at the construction site can be greatly reduced.
2. There is no effective secondary or tertiary leakage protection within the protection range.
The final leakage protector in the switch box is the main protection of the electrical equipment. If the final leakage protector is not installed, damaged or incorrectly selected, it may cause the upper leakage protector to trip frequently. Because the LED full-color display has a lot of metal conductors and a lot of wire joints, if the wire insulation is not very good, it will cause frequent leakage; some also add some sockets, and often do not install leakage protectors, often Cause leakage. Only when an effective secondary or tertiary leakage protection mode is formed within each protection range can the frequent tripping of the leakage protector be effectively reduced.
3. The leakage protector itself has certain limitations.
(1) Current leakage protectors, whether electromagnetic or electronic, use magnetically induced voltage transformers to pick up the leakage current in the main circuit of the electrical equipment used for picking up. Three-phase or three-phase four-wires cannot be completely balanced in the magnetic loop. The three-phase power 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 magnetic permeability. This electromotive force is so large To a certain extent, it will cause the leakage protector to trip. As the leakage current protector with a larger rated current uses a relatively large magnetic ring, the leakage magnetic flux generated is also relatively large, and the leakage current must overcome the magnetizing force of the magnetic ring itself, resulting in a larger rated current of the leakage protector actually used. The lower the sensitivity, the greater the rejection rate.
(2) The leakage protector has an uncertain area of action 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.
4. The selection of the leakage protector is unreasonable
(1) The rated leakage operating current used in the switch box exceeds 30mA or is more than twice the rated current of the electrical equipment, or a leakage protector with a delay type is selected. Increase or decrease the protection sensitivity. When a leakage fault occurs, the last-stage leakage protector does not operate, and the upper-level leakage protector may operate.
(2) The startup current when the LED full-color display is powered on is often large, and this large current may trip the leakage protector. Therefore, the cabinets of the display should be powered up in batches as much as possible. In addition, generally choose an electromagnetic leakage protector that is less sensitive to surge overvoltage and overcurrent; or use an electronic leakage protector that is 1.5 to 2 times larger than the rated current, but as the final leakage protection, the rated leakage action The current should not be greater than 30mA.
In short, the frequent tripping of the earth leakage protector is the result of a combination of various factors. The most important thing is to properly arrange the earth leakage protector, reduce the protection scope of the secondary or tertiary earth leakage protector, and correctly select the earth leakage protector and wiring so that each The second- or third-level leakage protectors in the range are in an effective protection state; on the other hand, it is to strengthen the management of electricity consumption and improve the self-quality of electricians through training, to eliminate non-electrical wiring, so as to improve the safety of electricity consumption. It can also reduce the frequent tripping of the leakage protector and create better power supply conditions for the normal operation of the LED full-color display.