배선 오류, 선로 손상, 개폐기의 누전방지기 파손, 일부 전기제품이 개폐기를 통과하지 않는 등 풀 컬러 LED 디스플레이 설치 장소의 특성으로 인해{0}, 누설 방지 장치 자체의 불가피한 오작동 및 작동 거부와 함께 실제 전력 소비량에 따라 누설 방지 장치를 배치하지 않아 전체 누설 방지 장치의 빈번한 트립이 발생합니다.
1. The layout of the leakage protector is unreasonable
배선 오류, 선로 손상, 개폐기의 누전방지기 파손, 일부 전기제품이 개폐기를 통과하지 않는 등 풀 컬러 LED 디스플레이 설치 장소의 특성으로 인해{0}, 누설 방지 장치 자체의 불가피한 오작동 및 작동 거부와 함께 실제 전력 소비량에 따라 누설 방지 장치를 배치하지 않아 전체 누설 방지 장치의 빈번한 트립이 발생합니다.
In addition to strengthening management for this situation, it is also necessary to rationally arrange the leakage protector according to the actual situation from a technical point of view. The leakage protector on the main power supply of the incoming line can be mainly used as a total protection to prevent electrical fire hazards and electrical short circuits. It also serves as a backup protection for each small leakage protection range. Its rated leakage current can be between 200 and 500 mA. Choose between, the rated leakage action time can be 0.20.3s. 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 operation of the total leakage protector can be improved. If the secondary leakage protection in each leakage protection range can be in an effective protection state, the frequency of frequent tripping of the total leakage protector on the construction site can be greatly reduced.
2, there is no effective secondary or tertiary leakage protection in the protection range
The last-stage leakage protector in the switch box is the main protection of electrical equipment. If the last-stage leakage protector is not installed, damaged or incorrectly selected, it may cause the upper-level leakage protector to trip frequently. Since there are many metal conductors in the full-color LED display, and there are many wire connectors, if the wire insulation is not very good, it will cause frequent leakage; some sockets are also added, and in many cases, leakage protectors are not installed. Cause leakage. Only when an effective secondary or tertiary leakage protection mode is formed in each protection range, can the frequent tripping of the leakage protector be effectively reduced.
3, the leakage protector itself has certain limitations
(1) The current leakage protectors, whether electromagnetic or electronic, use magnetic induction voltage transformers to pick up the leakage current in the main circuit of the electrical equipment. It is impossible to arrange three-phase or three-phase four-wire in the magnetic ring to be completely balanced. The three-phase power load of the full-color 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 permeability, which is so large To a certain extent, it will cause the leakage protector to trip. Since a leakage protector with a larger rated current uses a relatively large magnetic ring, the leakage flux generated is relatively large, and the leakage current must overcome the magnetizing force of the magnetic ring itself, resulting in a larger rated current of the leakage protector in actual use , The lower the sensitivity, the greater the rejection rate.
(2) There is an uncertain area between the rated leakage current and the rated non-operation current of the leakage protector. When the leakage current of the leakage protector fluctuates in this area, it may cause the leakage protector to trip irregularly.
4, the selection of leakage protector is unreasonable
(1) 스위치 박스에 사용되는 정격 누설 동작 전류가 30mA를 초과하거나 전기 장비의 정격 전류의 2배 이상인 경우 또는 정격 누설 동작 전류로 인해 시간 지연이 있는 누설 보호기를 선택한 경우 보호 감도, 누설 오류가 발생하면 마지막-누설 보호기가 작동하지 않고 상단-누설 보호기가 작동할 수 있습니다.
(2) The starting current when energizing the full-color LED display is often relatively large, and this large current may trip the leakage protector. Therefore, the cabinets of the display should be electrified in batches as much as possible. In addition, in general, an electromagnetic leakage protector that is not sensitive to surge overvoltage and overcurrent should be selected; or an electronic leakage protector that is 1.5 to 2 times larger than the rated current, but as the final leakage protection, rated leakage action The current should not be greater than 30mA.
요컨대, 누출 방지 장치의 빈번한 트립은 다양한 요인의 결과입니다. 가장 중요한 것은 누출 방지 장치를 합리적으로 배치하고, 두 번째 또는 세 번째 수준 누출 방지 장치의 보호 범위를 줄이고, 누출 방지 장치와 배선을 올바르게 선택하여 각 두 번째 또는 세 번째 수준의{0}레벨 누출 방지기를 범위 내에서 만드는 것입니다. 범위가 효과적인 보호 상태에 있습니다. 한편, 교육을 통해 전기 관리를 강화하고 전기 사용자의 품질을 개선하며,{1}비전기 배선을 제거하여 전기의 안전성을 향상시킬 수 있으며, 잦은 트립을 줄일 수도 있습니다. 누출 방지기를 만들고 풀 컬러 LED 디스플레이의 정상적인 작동을 위해 더 나은 전원 공급 조건을{2}}만듭니다.
