Solution to the trip of the LED display distribution box_LED full color display|full color LED displ

Solution to the trip of the LED display distribution box_LED full color display|full color LED display manufacturer|huaze

by:XY Screens     2021-10-03
In the process of using the LED display, some minor problems will inevitably occur. Today, according to the maintenance technicians of Huaze Optoelectronics, the solution to the problem of the LED display power distribution box tripping. 1. The selection of the leakage protector is unreasonable. The rated leakage action current used in the switch box exceeds 30mA or exceeds twice the rated current of the electrical equipment, or the leakage protector with delay type is selected. Due to the increase of rated leakage current or the decrease of protection sensitivity, when a leakage fault occurs, the last-stage leakage protector does not operate, and the upper-level leakage protector may operate. Huaze Optoelectronics reminds that the starting current when energizing the large LED screen is often relatively large, and this large current may trip the leakage protector. Therefore, the cabinets of the display should be electrified in batches as much as possible. In addition, electromagnetic leakage protectors that are not very sensitive to surge overvoltage and overcurrent should generally be selected; or electronic leakage protectors 1.5 to 2 times larger than the rated current should be selected, but as the final level of leakage protection, rated leakage action The current should not be greater than 30mA. 2. The layout of the leakage protector is unreasonable due to the peculiarities of the installation site of the LED full-color display, such as wiring errors, line damage, damage to the leakage protector in the switch box, and some electrical appliances not passing through the switch box, etc., and leakage The inevitable misoperation and refusal of the protector itself, coupled with the failure to arrange the leakage protector according to the actual electricity consumption, caused the total leakage protector to trip frequently. For this situation, in addition to strengthening management, Huaze Optoelectronics also needs to rationally arrange the leakage protector according to the actual situation from a technical point of view. The leakage protector on the incoming main power supply can be mainly used as a total protection to prevent electrical fire hazards and electrical short-circuits. It also serves as a backup protection for each small leakage protection range. Its rated leakage action current can be between 200 and 500 mA. Choose between, the rated 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 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 in each leakage protection range can be in an effective protection state, the frequency of frequent tripping of the total leakage protector on the construction site can be greatly reduced. 3. 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 improperly selected, it will It may cause frequent tripping of the superior leakage protector. Since there are many metal conductors in the LED full-color display screen and there are many wire connectors, if the wire insulation is not very good, it will cause frequent leakage. Some sockets are added, and leakage protectors are not installed in many cases. Cause leakage. Huaze Optoelectronics reminds that only by forming an effective secondary or tertiary leakage protection mode in each protection range, can the frequent tripping of the leakage protector be effectively reduced. 4. The leakage protector itself has certain limitations (three-phase electricity is unbalanced) The current leakage protector, whether electromagnetic or electronic, uses a magnetic induction voltage transformer to pick up the leakage current in the main circuit of the electrical equipment. It is impossible for three-phase or three-phase four-wire to be completely balanced in the magnetic ring. The three-phase electricity load of the LED full-color electronic display cannot be completely balanced. Under high current or high overvoltage, a certain electromotive force will be induced in the magnetic ring with high permeability. This electromotive force is large. To a certain extent, it will cause the leakage protector to trip. Since a leakage protector with a larger rated current uses a relatively large magnetic ring, the leakage flux generated is 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 in actual use , The lower the sensitivity, the greater the rejection rate. The leakage protector has a certain operation uncertainty area 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. Here, Huaze Optoelectronics analyzed that the frequent tripping of the LED display leakage protector is the result of the combined effect of various factors. The most important thing is to rationally arrange the leakage protector to reduce the protection range of the second or third-level leakage protector. It is used for three-phase. The power distribution is as uniform as possible, and the correct selection of leakage protectors and wiring, so that the second or third level leakage protectors in each range are in an effective protection state; the other hand is to strengthen the management of electricity consumption and improve the quality of electricity users through training. Eliminate non-electrical wiring, which can not only improve the safety of electricity use, but 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.
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