Why does the LED large screen frequently trip? The following is a simple analysis of the LED large screen frequently trips. Hope to solve the problem of your LED screen tripping.

  1. The layout of the leakage maintainer is unreasonable

  Because of the peculiarities of the LED large screen installation site, such as wiring errors, line damage, damage to the leakage maintainer in the switch box, some electrical appliances not passing through the switch box, etc., as well as the inevitable misoperation and rejection of the leakage maintainer itself. In addition, the leakage maintainer was not installed in accordance with the actual electricity usage, resulting in frequent tripping of the total leakage maintainer.

  Regarding this situation, in addition to strengthening management, it is also necessary to reasonably arrange the leakage maintainer from a technical point of view and based on the actual situation. The leakage maintainer on the incoming main power supply can be used primarily as a total maintenance to prevent electrical fire hazards and electrical short circuits, and also as a backup maintenance for each small leakage maintenance scale. Its additional leakage action current can be between 200 and 500 mA. Choose between, and the additional leakage action time can be 0.2~0.3s. In this way, the influence of surge voltage, surge current, and electromagnetic interference on the total leakage maintainer can be greatly reduced, and the selectivity and reliability of the operation of the total leakage maintainer can be improved. If the secondary leakage maintenance in each leakage maintenance scale can be effectively maintained, the frequency of frequent tripping of the total leakage maintainer on the construction site can be greatly reduced.

  2. There is no effective secondary or tertiary leakage maintenance within the maintenance scale

  The final leakage maintainer in the large LED screen switch box is the main maintenance of electrical equipment. If the final leakage maintainer is not installed, damaged or selected incorrectly, it may cause the upper leakage maintainer to trip frequently. Because there are many metal conductors in the large LED screen and there are many wire connectors, if the wire insulation is not good, it will often cause leakage; some sockets are added, and leakage maintainers are not installed in many cases, which often results in leakage. . Only when an effective secondary or tertiary leakage maintenance mode is formed in each maintenance scale can the frequency tripping of leakage maintainers be effectively reduced.

  3. The LED large screen leakage maintainer itself has certain limitations

  (1) The current leakage maintainers, whether electromagnetic or electronic, use magnetic induction voltage transformers to pick up the leakage current in the main circuit of the electrical equipment. It is impossible to install three-phase or three-phase four-wire in the magnetic ring to be completely balanced. The three-phase power load of the LED large 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 large to a certain extent. , It will cause the leakage maintainer to trip. Because the leakage current maintainer with the larger the extra current uses a relatively large magnetic ring, the leakage flux is relatively large, and the leakage current must overcome the magnetizing force of the magnetic ring itself, which leads to the larger the additional current of the leakage maintainer used in practice. , The lower the sensitivity, the greater the rejection rate.

  (2) The leakage current maintainer has a certain operation uncertainty area between the additional leakage current and the additional leakage non-operation current. When the leakage current of the leakage current maintainer fluctuates in this area, it may cause the leakage maintainer to trip irregularly.

  4. The selection of the leakage maintainer is unreasonable

  (1) The extra leakage action current used in the switch box exceeds 30mA or exceeds the extra current of the electrical equipment by more than twice the extra current leakage maintainer, or the delay type leakage maintainer is selected, because the extra leakage action current is When improvement or maintenance sensitivity declines, and a leakage fault occurs, the last-stage leakage maintainer does not operate, and the upper-level leakage maintainer may operate.

  (2) The starting current when energizing the large LED screen is often relatively large, and this large current may trip the leakage protector. Therefore, the large LED screen should be powered on as much as possible in batches. In addition, an electromagnetic leakage maintainer that is not sensitive to surge overvoltage and overcurrent should generally be used; or an electronic leakage maintainer that is 1.5 to 2 times larger than the additional current, but as the final stage of leakage maintenance, additional leakage The operating current should not be greater than 30mA.

  In short, the frequent tripping of the leakage maintainer is the result of various factors. The most important thing is to arrange the leakage maintainer reasonably, reduce the maintenance scale of the second or third-level leakage maintainer, and correctly select the leakage maintainer and wiring to make each The second or third-level leakage maintainers in the scale are in effective maintenance; the other hand is to strengthen the management of electricity and improve the quality of electricity users through training, and eliminate non-electrical wiring, so that the safety of electricity can be improved. It can also reduce the frequent tripping of the leakage maintainer, and create better power supply conditions for the normal operation of the large LED screen.