The reason of frequent tripping of distribution box with LED full-color display screen is analyzed

- Jul 02, 2019-

Some people will always ask why the full color LED display distribution box trip frequently? The following LED full color display frequent tripping to do a simple analysis. Hope to solve your LED full color display panel tripping doubt.


1. Unreasonable layout of leakage protector


Due to the particularity of full color LED display installation site, such as wiring error, the wiring is shot, switch cabinet leakage protector damage, some electrical appliances without switch box, as well as the leakage protector itself inevitably misoperation and refused to move, plus not according to the actual electricity leakage protector for decorate, caused the leakage protector the frequent trip.


In addition to strengthening management, it is also necessary to arrange the leakage protector reasonably according to the actual situation from the technical point of view. The leakage protector on the main power supply of the incoming line can be mainly used as the general protection against electrical fire hazards and electrical short circuit, and as the backup protection for each small leakage protection range. Its rated leakage action current can be selected between 200 ~ 500mA, and rated leakage action time can be selected from 0.2~0.3s. In this way, the influence of surge voltage, surge current and electromagnetic interference on total leakage protector can be greatly reduced, and the operation selectivity and reliability of total leakage protector can be improved. If the secondary leakage protection within each leakage protection range can be effectively protected, the frequent tripping probability of the total leakage protection at the construction site can be greatly reduced.


2. No effective secondary or tertiary leakage protection is formed within the protection range


The final leakage protector in the switch box is the main protection of electrical equipment. If the final leakage protector is not installed, damaged or improperly selected, it may lead to frequent tripping of the upper leakage protector. As there are many metal conductors in the LED full-color display screen and many wire joints, if the wire insulation is not very good, it will lead to frequent leakage of electricity; Some also added a few sockets, in many times are not installed leakage protector, often cause leakage.


3. Leakage protector itself has certain limitations (unbalanced three-phase electricity consumption)


The current leakage protector, no matter electromagnetic type or electronic type, adopts magnetic induction voltage transformer to pick up the leakage current in the main circuit of electric equipment. It is impossible to arrange the three-phase or three-phase four-wire in the magnetic ring to be completely balanced. The three-phase electrical load of the full-color LED display screen is also impossible to be completely balanced. Under large current flow or high overvoltage, a certain electromotive force will be induced in the magnetic ring with high magnetic conductivity, and the electromotive force will be large enough to cause the leakage protector to trip. As the higher the rated current, the leakage protector adopts a relatively large magnetic ring, and the leakage flux is also relatively large, and the leakage current has to overcome the magnetization force of the magnetic ring itself, which leads to the larger the rated current, lower the sensitivity and higher the rejection rate of the leakage protector in actual use.


There is a period of uncertain action area between rated leakage current and rated leakage current. When leakage current of leakage protector fluctuates in this area, it may lead to irregular tripping of leakage protector.


4. Unreasonable selection of leakage protector


Rating of the switch used in the leakage current action more than 30 ma or is more than rated current electrical equipment more than twice the leakage protector, or with the delay type leakage protector, due to the increase of leakage current action rating or a reduction in the protection sensitivity, the leakage fault occurs, the end leakage protector without action, the higher leakage protector can action.


Powerful giant color reminder in the LED large screen power start current is often relatively large, this large current may make leakage protector trip. Therefore, should be as far as possible in batches to the display box power. In addition, generally should choose to surge over voltage, over current is not too sensitive electromagnetic leakage protector; Or choose the electronic leakage protector 1.5~2 times larger than the rated current, but as the final leakage protection, rated leakage action current should not be greater than 30mA.


In short, powerful giant colour has analyzed the leakage protector the frequent trip is a result of the combined action of various factors, the most main is to reasonable decorate leakage protector, narrowing the scope of the protection of the two or three leakage protector, three-phase power distribution uniformity, correct selection of leakage protector and wiring, every two or three leakage protector in the range of the under effective protection. On the other hand, strengthen electricity management and improve the quality of electricity personnel through training, eliminate non-electrical wiring, which can not only improve the safety of electricity consumption, but also reduce the frequent tripping of leakage protector, to create better power supply conditions for the normal work of LED full-color display screen.