Due to the particularity of the LED display installation site, such as wiring errors, line damage, damage to the leakage protector of the switch box, and some electrical appliances failing to pass through the switch box, etc. , The leakage protector itself will inevitably appear to malfunction and refuse. In addition, the leakage protector is not installed in accordance with the actual electrical protection device.
1. The layout of the leakage protection device is unreasonable.
Due to the particularity of the LED display installation site, such as wiring errors, line damage, damage to the leakage protector of the switch box, and some electrical appliances failing to pass through the switch box, etc. , The leakage protector itself will inevitably appear to malfunction and refuse. In addition, the leakage protector is not installed in accordance with the actual electrical protection device.
In this regard, in addition to strengthening management, leakage protection devices should also be reasonably arranged from a technical perspective, based on actual conditions. The leakage protector on the incoming main power supply is mainly used to prevent electrical fire hazards and electrical short-circuit protection, and to do a backup protection for each small leakage protection. The rated leakage current can be selected from 200 to 500 mA, and the rated leakage time can be selected from 0.2 to 0.3 seconds. Through this method, the influence of factors such as total leakage voltage, surge current, electromagnetic interference, etc. can be greatly reduced, and the selectivity and reliability of the total leakage action can be improved. If the secondary leakage protection in each leakage protection range is in an effective protection state, the probability of frequent tripping of the on-site total leakage protector can be greatly reduced.
2. There is no effective secondary or tertiary leakage protection in the protection range.
In the switch box, the final leakage protector is the main protection device for electrical equipment. If the final leakage protector is not installed, damaged or selected improperly, it may cause frequent tripping of the upper leakage protector. Because there are many metal conductors and connections on the LED display screen, if the wire insulation is not good, it will cause frequent leakage; some sockets are added, and leakage protectors are often not installed, resulting in leakage. Only when an effective secondary or tertiary leakage protection mode is formed in various protection ranges, can the leakage protector frequently trip effectively.
In summary, the frequent tripping of LED displays is the result of various factors, the most important of which is to set up a leakage protector reasonably, reduce the scope of the second and third levels of protection, and correctly select the leakage protector and wiring to ensure leakage protection. The device is in an effective protection state in all areas, while strengthening power management, improving the quality of power users through training, preventing the use of leakage protectors within the power wiring range, and effectively protecting all levels of leakage protectors.
