Analyze the LED display tripping problem

LED display on why the problem of frequent tripping. The following LED Controller Store on LED display frequent tripping problem to give you a simple analysis.

• Leakage protector layout is unreasonable

Due to the special characteristics of the LED display installation site, such as wiring errors, broken lines, switch box leakage protector damage, some of the electrical appliances do not pass through the switch box and other reasons, as well as the leakage protector itself inevitably misbehavior and refusal to act, coupled with not in accordance with the actual electricity leakage protector layout, resulting in frequent tripping of the total leakage protector.
For this situation in addition to strengthening the management, but also from the technical point of view, according to the actual situation of the leakage protector for reasonable arrangement. Incoming mains leakage protector, can be mainly done to prevent electrical fire hazards and electrical short circuit protection, and do each small leakage protection range of backup protection, its rated leakage action current can be selected between 200 ~ 500mA, rated leakage action time can be selected 0.2 ~ 0.3s. In this way, can greatly reduce the surge voltage, inrush current, electromagnetic interference on the total leakage protector This can greatly reduce the surge voltage, surge current, electromagnetic interference on the total leakage protector, and improve the selectivity and reliability of the total leakage protector action. If you can make each leakage protection within the scope of the second leakage protection in an effective state of protection, you can greatly reduce the site of the total leakage protector of the frequent tripping rate.

• There is no effective secondary or tertiary earth leakage protection within the scope of protection

Switch box in the final leakage protector is the main protection of electrical equipment, if the final leakage protector is not installed, damaged or improper selection, will likely lead to the upper leakage protector frequently tripped. As many metal conductors in the LED display, more wire connectors, if the wire insulation is not very good, it will lead to frequent leakage conditions; some also added some sockets, in many cases are not installed leakage protector, often resulting in leakage. Only in each protection range to form an effective two or three leakage protection mode, in order to effectively reduce the frequent tripping of the leakage protector.

• The leakage protector itself has certain limitations

(1) the current leakage protector, whether electromagnetic or electronic type are used magnetic induction voltage transformer to pick up the leakage current in the main circuit of the power equipment, three-phase or three-phase four-wire in the magnetic ring is not possible to arrange a completely balanced. three-phase LED display load can not be completely balanced, in the high current or higher overvoltage, there will be a very high permeability of the magnetic ring induces a certain electric potential, the electric potential is large enough to a certain extent, it is possible to reduce the frequent tripping. Electric potential to a certain extent, it will lead to leakage protector tripping. As the larger the rated current leakage protector using a relatively large magnetic ring, the resulting leakage flux is also relatively large, and the leakage current to overcome the magnetizing force of the magnetic ring itself, resulting in the actual use of the leakage protector rated current, the lower the sensitivity, the larger the rejection rate.
(2) leakage protector in the rated leakage action current and rated leakage current between the action uncertainty region, leakage protector leakage current fluctuations in this region, may lead to leakage protector irregular trip.

• Leakage protector selection is unreasonable

(1) The rated leakage action current used in the switch box exceeds 30mA or more than twice the rated current of the power equipment leakage protector, or the selection of leakage protector with a delay type, due to the increase in the rated leakage action current or the decrease in the sensitivity of the protection, the occurrence of a leakage fault, the last leakage protector does not act, the upper leakage protector may act.
(2) to the LED display when the start-up current is often large, this large current may make the leakage protector trip. Therefore, should be as much as possible in batches to the display of the box on the power. In addition, generally should be used on the surge overvoltage, overcurrent is less sensitive to electromagnetic leakage protector; or choose than the rated current 1.5 ~ 2 times the electronic leakage protector, but as the last leakage protection, rated leakage action current should not be greater than 30mA.

In short, the leakage protector frequently tripped is the result of a combination of factors, the main thing is to rationalize the layout of the leakage protector, to narrow the scope of protection of the two or three leakage protector, the correct choice of leakage protector and wiring, so that each range of the two or three leakage protector is in an effective state of protection; on the other hand, it is to strengthen the management of electricity and through training to improve the quality of electricity personnel to put an end to non-electricians! Wiring, so that you can not only improve the safety of electricity, but also reduce the leakage protector of the frequent tripping, to the normal work of the LED display to create better power supply conditions.