Why is my LED display distribution cabinet tripping frequently? What's the reason? The following on the LED Full color screen
frequent trip to do a simple analysis.
Hope to be able to solve your led Full-color display power Distribution box trip puzzle.
1, leakage protection device layout unreasonable
Because of the particularity of the LED display installation site, such as wiring errors, line breakage, the leakage protector inside the switch box damage, some of the electrical equipment did not go through the switch box, and other reasons, as well as the leakage protector itself unavoidable misoperation and rejection, coupled with the actual use of electricity in accordance with the situation of leakage protector layout,caused the total leakage protector frequent trip. In addition to strengthen the management of this situation, but also from the technical point of view, according to the actual situation of the leakage protector reasonable arrangement. Incoming line of the total power supply leakage protector, can be mainly used to prevent electrical fire hazards and electrical short circuit of the total protection, and do each small leakage protection of the scope of back-up protection, its rated leakage action current can be selected between 200~500ma, rated leakage action time can choose 0.2~0.3s. In this way, the effect 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 action are improved.
If you can make each leakage protection within the scope of the two-level leakage protection in an effective protection state, can greatly reduce the total site leakage Protector frequent trip probability.
2, within the scope of protection does not form an effective level two or three leakage protection
The last stage leakage protector in the switch box is the main protection of the electric equipment, if the last stage leakage protector is not installed, damaged or improperly chosen, it will likely lead to frequent tripping of the superior leakage protector.
As a result of LED display a lot of metal conductor, wire connectors More, if the wire insulation is not very good, will lead to frequent leakage of the situation, and some also added some sockets, in many cases do not install leakage protector, often caused by leakage.
3, leakage protector itself has certain limitations (three-phase electric power imbalance)
Current leakage protector, whether electromagnetic or electronic, uses magnetic inductive voltage transformer to pick up the leakage current in the main circuit, and three-phase or three-phase four lines cannot be fully balanced in the magnetic ring. LED Signs
three-phase power load can not be fully balanced, under large current or higher overvoltage, will be in a very high permeability magnetic ring induction of a certain electromotive force, this electromotive force to a certain extent, will lead to leakage protector trip.
Due to the larger rated current leakage protector using relatively large magnetic ring, the resulting leakage flux is relatively large, and leakage current to overcome the magnetic ring itself magnetization, resulting in the actual use of leakage protector rated current, the lower the sensitivity, the higher the rejection rate.
Leakage Protector in the rated leakage action current and rated leakage action current between a period of uncertainty, leakage current protection in this area fluctuations, may lead to leakage protector irregular trip.
4, leakage protection device selection unreasonable
The rated leakage action current used in the switch box is more than 30mA or is more than twice times the rated current of the electric equipment, or the use of a delay-type leakage protector, due to the rated leakage action current increase or protection sensitivity of the decrease, leakage fault, the last stage leakage protector does not move,The superior leakage protector may move. In the LED large screen power when the starting current is often relatively large, this large current may cause leakage protector trip. Therefore, the display should be given a lot of power to the box.
In addition, the general should be selected on the surge overvoltage, over-current is not sensitive to electromagnetic leakage protector, or to choose a larger than the rated current 1.5~2 times electronic leakage protector, but as the last stage leakage protection, rated leakage action current should not be greater than 30mA. In short, the above analysis of the leakage protector frequent trip is the result of the comprehensive effect of various factors, the most important thing is to rationally decorate the leakage protector, reduce the protection range of the second or three level leakage protector, distribute the three-phase electricity evenly, correct choose the leakage protector and wiring, make the leakage protector of two or three in each range be in effective protection state On the other hand is to strengthen the power management and through training to improve the quality of electrical personnel, to eliminate the non-electrical wiring, so you can not only improve the safety of electricity, but also reduce the frequent trip leakage protector, LED display
of the normal work to create a better supply conditions.