Why Is The LED Display Screen Frequent Tripping
Why is the LED display frequent tripping? Here is a simple analysis of LED screen frequent tripping. I hope to solve the problem of your LED screen tripping.
Unreasonable layout of the leakage protector
Due to the particularity of the installation site of the LED display, such as wiring errors, broken lines, damage to the leakage protector in the switch box, some electrical appliances not passing through the switch box, as well as the inevitable misoperation and rejection of the leakage protector itself, and the failure to carry out the leakage protector according to the actual power consumption. The arrangement leads to frequent tripping of the total leakage protector.
In addition to strengthening management, it is necessary to arrange the leakage protector reasonably from the technical point of view and according to the actual situation. The leakage protector on the total power supply of the line can be mainly used to protect the electric fire hazard and electrical short circuit, and do the backup protection of each small leakage protection range. The rated leakage current can be selected between 200 and 500mA, and the rated leakage action time is optional 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 action of the total leakage protector can be improved. If the two stage leakage protection in each leakage protection range is in an effective state of protection, the frequent trip probability of the total leakage protector in the construction site can be greatly reduced.
There is no effective protection within the scope of protection
Two or three level leakage protection
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 improper selection, it may lead to the frequent tripping of the superior leakage protector. Because of the large number of metal conductors in the LED display screen, the wire joint is more, if the wire is not very good, it will cause the current leakage current; some also add some sockets, in many times do not install the leakage protector, often cause the leakage. Only if the effective two or three level leakage protection mode is formed in each protection area, can the frequency tripping of the leakage protector be effectively reduced.
The leakage protector itself has some limitations
(1) the current leakage protector, both electromagnetic and electronic type, uses magnetic induction voltage transformer to pick up the leakage current in the main circuit of the electric equipment, and the three-phase or three phase four wire can not be completely balanced in the magnetic loop. The three-phase power load of the LED display can not be fully balanced. Under large current or high overvoltage, a certain electromotive force will be induced in a magnetic ring with very high conductivity. This emf will lead to the leakage of the leakage protector to a certain extent. The bigger the rated current is, the larger the leakage protector uses relatively large magnetic ring, the leakage flux is relatively large, and the leakage current should overcome the magnetic force of the magnetic ring itself, which leads to the greater the rated current of the actual leakage protector, the lower the sensitivity and the greater the rejection rate.
(2) the leakage protector has an undefined action area between the rated leakage current and the rated leakage current. When leakage current of the leakage protector is fluctuated in this area, it may lead to irregular tripping of the leakage protector.
Unreasonable selection of leakage protector
(1) the rated leakage current used in the switch box is more than 30mA or more than two times more than the rated current of the electric equipment, or the delay type leakage protector is selected. Due to the increase of the rated leakage current or the decrease of the protection sensitivity, the last leakage protection occurs when the leakage fault occurs. The device has no action, and the leakage protector at the higher level may act.
(2) when the LED display is energized, the starting current is always relatively large. This large current may cause the leakage protector to trip. Therefore, the cabinet of the display screen should be powered up in batches as far as possible. In addition, the electromagnetic leakage protector which is not sensitive to surge overvoltage and overcurrent should be selected, or electronic leakage protector, which is 1.5~2 times larger than the rated current, should be selected, but as the last stage leakage protection, the rated leakage current should not be greater than 30mA.
In a word, the frequent tripping of the leakage protector is the result of all kinds of factors, the most important thing is to arrange the leakage protector reasonably, reduce the protection range of the two or three level leakage protector, select the leakage protector and connection correctly, make the two or three level leakage protector in each range effectively protect the state; on the other hand, it is in the effective protection state; It is to strengthen the use of electricity management and training to improve the quality of the electric personnel, to eliminate non electrical wiring, so that the safety of electricity can be improved, and the frequent tripping of the leakage protector can be reduced, and the good power supply conditions for the normal work of the LED display screen can be created.