Shenzhen Lianchengfa Technology Co., Ltd.

    Why does the LED display trip and leak electricity?

     1. Improper arrangement of the leakage protector

     Due to the special installation position of the LED display screen, if the wiring is wrong, the switch box leakage protector is damaged, the line is damaged, some electrical appliances fail to pass through the switch box, etc. The leakage protector is not arranged according to the actual power consumption, resulting in frequent tripping of the leakage protector.

     In addition to strengthening management in this situation, it is also necessary to arrange leakage protectors reasonably according to the actual situation from a technical point of view. The leakage protector using the main power supply of the incoming line is mainly used for comprehensive maintenance to prevent electrical fire hazards. It can also perform backup maintenance for each small amount of leakage maintenance. The additional leakage current can be selected between 200~500mA. The action time can be selected from 0.2 to 0.3s. It can greatly reduce the impact of surge voltage, surge current, and electromagnetic interference on the full leakage protector. If the secondary leakage maintenance personnel within the scope of each leakage maintenance can work normally, the probability of total tripping of the on-site leakage maintenance can be greatly reduced.

     2. It does not constitute useful secondary or tertiary leakage maintenance within the scope of maintenance

     The last-level leakage protector is mainly repaired for the electrical equipment in the switch box. If the last-level leakage protector is not installed, damaged or improperly selected, it may cause frequent trips of the previous leakage protector. Due to the large number of metal conductors in the LED display screen, there are many wire connections. If the wire insulation is not good, it will cause leakage; Leakage. By analyzing the maintenance work of each maintenance section, as long as the two-level or three-level maintenance mode is formed, the trip frequency of leakage maintenance can be effectively reduced.

     3. The leakage protector itself also has some limitations

     (1) The current leakage protectors, whether electromagnetic or electronic, use magnetic induction voltage transformers to pick up the leakage current in the main circuit of the electrical equipment. Three-phase or three-phase four-wire is completely impossible in the magnetic ring. placement. The three-phase power supply load of the LED display cannot be completely balanced. Under the condition of strong current or overvoltage, the magnetic ring with very high permeability on the magnetic ring induces a certain electromotive force. This electromotive force is large to a certain extent, which will lead to leakage. The protector has tripped. Because the leakage magnetic flux generated by the magnetic ring with a larger additional current selected by the leakage protector is also relatively large, and the leakage current is greater than the magnetizing force of the magnetic ring itself, the magnetizing force of the magnetic ring used in practical applications will be lower. The resulting leakage current is also smaller.

     (2) The leakage protector has an action uncertainty area between the additional leakage current and the additional leakage non-operating current. The leakage current of the leakage protector shakes in this area, which will also cause the leakage protector to trip irregularly.

     4. The choice of leakage protector is unreasonable

     (1) The additional leakage current used by the switch box exceeds 30mA or the leakage protector exceeds twice the additional current of the electrical equipment. It is also possible to use a delay type leakage protector, which is due to the increase of the leakage current or the decrease of the maintenance sensitivity. , After testing, the last-stage leakage protector has not acted after leakage.

     (2) When the LED display is powered on, the starting current is often large, and the high current may cause the leakage protector to trip. Therefore, try to arrange the power of the display box in a certain order. In addition, electromagnetic leakage protectors with low sensitivity to surge overvoltage and overcurrent should generally be selected; or electronic leakage protectors with 1.5 to 2 times larger than the additional current should be selected. 30mA.

      Due to the combined effect of various factors, the leakage protector frequently trips. The most important thing is to place the leakage protector reasonably, reduce the maintenance scale of the second and third-level leakage protectors, and correctly select the leakage protector and wiring. On the other hand, it strengthens the management of electricity consumption, improves the quality of electricity users, and eliminates non-electrician wiring, which can not only ensure safe electricity use, but also reduce frequent trips. situation, to create better power supply conditions for the normal operation of the LED display.

      How to avoid fire with outdoor full color led display?

     Because of the popularity of full-color LED displays on indoor and outdoor displays, there have been many fire accidents caused by quality problems and design defects of various color-screen products, posing a great threat to the safety of employees. In this regard, we are only beginning to explain security incidents in more depth. How to prevent fire accidents in practice?

     The danger of fire in full-color LED displays lies in the defects of several main raw materials.

     One is the wire. When most screens are used, the more information displayed per unit area, the greater the power consumption, and the higher the power supply stability standard of the wire. Among the many wire products, only the wire that meets the national standard can be used to ensure safety and stability.

     Second is electricity. At the same time, UL-certified power supply products are also the best choice for product selection, with a reasonable conversion rate to ensure the safe and stable operation of the power load, and everything is ready under the condition of high temperature in the external environment.

     The third is protective materials. The aluminum-plastic panels of traditional outdoor display products age rapidly due to high temperature, rain, cold air, cold and thermal shocks. In the humid climate season, dew easily penetrates into the screen, causing short circuit of electronic components and causing fire accidents. From the perspective of the material of the safety protection structure of the screen appearance, the display products with high fire protection grades on the market mostly use fire safety aluminum-plastic panels, which have good fire resistance and strong fire safety and flame retardancy.

     Fourth, plastic products. The key to the plastic sleeve is the raw material for the lower shell of the unit module mask, and the core application raw material is PC glass raw material with internal combustion function, which not only has a flame retardant effect, but also prevents deformation when used at high, low, and light for a long time. Easy-to-break, well-sealed adhesive is used in one piece to reasonably prevent outside rainwater from infiltrating into the room, causing fire and short-circuit failure.

     The internal material not only affects the actual effect of the fire, but also requires external design such as cooling. The full-color led display works at high temperature, and the power consumption is also a huge test. If you use a large screen, it will be more difficult to dissipate heat. In the past, outdoor large screens were developed into internal air-conditioning equipment after auxiliary cooling such as fans. At the same time, in the post-maintenance work, key factors cannot be ignored. In other words,