Preschool smooth dismissal display screen Q4 full-color IP65 waterproof level, anti direct lightning and induction lightning

Description :

　　The kindergarten has smooth dismissal, with an outdoor P5 full-color display screen and IP65 waterproof and lightning protection

　　Regarding the IP waterproof rating of outdoor display screens

　　IP protectionThe grading standards were drafted by ICE (a globally recognized qualification and quality control center) to classify electrical equipment based on their waterproof properties. The IP protection level consists of two digits, one indicating the dust-proof and anti foreign object penetration level of the electrical appliance, and the second indicating the degree of sealing of the electrical appliance against moisture and water penetration. The larger the number, the higher its level.

　　Taking IP65 as an example, 6 is a number indicating complete prevention of foreign objects and dust from entering. Our common outdoor LED display screens can meet this requirement on the front, whether it is a full box or a half box, but many outdoor displays still cannot meet this requirement on the back. The six characters here require simultaneous requirements at the end to have practical significance, which means that there must be this requirement before and after, and the requirements are also relatively high. And IP65, with a suffix of 5 words, means: to prevent water from spraying out from all directions from entering the electrical appliance, half box, and simple box do not meet this requirement, only the full box can meet it. When we make outdoor large screens, many of them are enclosed in a single box, with the front being an integrated box and the whole being outsourced. In principle, this approach can also meet the IP65 standard. However, in order to dissipate heat, many air conditioners are installed inside, and the water from the air conditioners splashes onto the half box. In this case, waterproofing must be done well.

　　In the practical application and installation of LED, our display screens often require installation on the top or outer wall side of buildings at a height of about 30-50m. According to the requirements of the national general lightning protection regulations for buildings, these parts will be subject to direct lightning strikes, side lightning strikes, and induced lightning damage. The display screen must be well protected against lightning.

　　The voltage of lightning is very high, reaching 100 million to 1 billion volts, which is 10000 to 100000 times that of commonly used high-voltage lines. At such high voltage, charged clouds penetrate the atmosphere and release electrical energy once. When lightning is released, the charge carried by the charged cloud layer rapidly decreases, causing electrostatic induction and electromagnetic induction in the metal conductor about 2 kilometers around the lightning occurrence point, forming high voltage or instantaneous surge current inside the conductor. Both high voltage and instantaneous surge current can cause the power supply of LED display screens to burn out, chips and tubes to be broken down, and lightning struck display screens generally have no possibility of repair. Therefore, lightning protection for LED display screens is very necessary.

　　1、 Protection against direct lightning strikes:Install lightning rods on the support structure of LED outdoor display screens.

　　2、 For the protection of steel structures: Connect the steel structure to the shell of the LED display screen, ensure equipotential, and ground it properly. The grounding resistance value is generally required to be less than 10 ohms. If the resistance value does not meet the requirements, an additional artificial grounding grid must be installed, and the lightning arrester should also be grounded properly.

　　3、 Regarding the induction of lightning current on power lines:Install single-phase or three-phase power lightning arresters on the power line. The cross-sectional area of the connecting wire cannot be less than 6mm square, and the cross-sectional area of the connecting ground wire cannot be less than 10mm square.

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• Kindergarten smooth dismissal display screen