Why do LED screens trip so often?

- May 20, 2019-

Led screen frequent trip is why? Below on the led screen frequent trip to do a simple analysis. Hope to solve your led display tripping problem.

The layout of leakage protector is not reasonable

Due to the particularity of led display installation site has, 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 no according to the actual amount of electricity leakage protector for decorate, caused the leakage protector the frequent trip.

In this case, in addition to strengthening management, but also from the technical point of view, according to the actual situation of the leakage protector reasonable layout. The leakage protector on the main power supply of the incoming line can be mainly used as the overall protection against electrical fire hazards and electrical short circuit, and also as the backup protection for each small leakage protection range. Its rated leakage action current can be selected between 200 ~ 500mA, and the rated leakage action time can be selected from 0.2~0.3s. In this way, the impact of surge voltage, surge current and electromagnetic interference on the total leakage protector can be greatly reduced, and the selectivity and reliability of the 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 protector at the construction site can be greatly reduced.

Not effective within the range of protection

Secondary or tertiary leakage protection

The final level leakage protector in the switch box is the main protection of the electrical equipment. If the final level leakage protector is not installed, damaged or improperly selected, it may cause frequent tripping of the upper level leakage protector. As there are a lot of metal conductors and wire connectors in the led display screen, if the wire insulation is not very good, it will lead to frequent leakage of electricity. Some also added a number of sockets, in many cases are not installed leakage protector, often resulting in leakage. Only by forming effective secondary or tertiary leakage protection mode within each protection range can the frequent tripping of the leakage protector be effectively reduced.

The leakage protector itself has some limitations

(1) the current leakage protector, whether electromagnetic or electronic, USES magnetic induction voltage transformer to pick up the leakage current in the main circuit of the electrical equipment, and it is impossible for three-phase or three-phase four wires to be completely balanced in the magnetic ring. The three-phase power load of led display cannot be completely balanced. Under high current or high overvoltage, a certain electromotive force will be induced in the magnetic ring with high magnetic conductivity. If the electromotive force is large enough, the leakage protector will trip. The rated current of the leakage protector is larger than the rated current, and the magnetic flux leakage is larger than the rated current of the leakage protector. The leakage current has to overcome the magnetization force of the magnetic ring itself, so the rated current of the leakage protector is larger, the sensitivity is lower, and the reject rate is higher.

(2) the leakage protector has a period of action uncertain area between rated leakage action current and rated leakage non-action current. When the leakage current of the leakage protector fluctuates in this area, it may cause the leakage protector to trip erratically.

The selection of leakage protector is unreasonable

(1), switch used in the rating of 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.

(2) when the led display is energized, the starting current is usually large, which may make the leakage protector trip. Therefore, as far as possible, the display box should be electrified in batches. In addition, the general selection of surge over voltage, over current is not too sensitive to the electromagnetic leakage protector; Or choose electronic leakage protector 1.5~2 times larger than rated current, but as the final level of leakage protection, rated leakage action current should not be greater than 30mA.

In short, leakage protector frequent trip is the result of a variety of factors, the most important is to be reasonable arrangement of leakage protector, narrow two or three leakage protector protection range, the correct choice of leakage protector and wiring, so that each range of two or three leakage protector in an effective state of protection; On the other hand, it is to strengthen the management of electricity consumption and improve the quality of power users through training, so as to eliminate the wiring of non-electricians. In this way, the safety of electricity consumption can be improved, and the frequent tripping of leakage protector can be reduced to create better power supply conditions for the normal work of led display screen.