LED small classroom] Thunderstorm season, outdoor LED display to remember to do a good job of lightning protection measures
Summer thunderstorms, some outdoor LED display installed in high places, and the mounting bracket is generally iron, easy to become the target of lightning strikes. Once struck by lightning, will cause damage to the LED display, and even cause fire. Therefore, outdoor LED display lightning protection measures are essential.
The main lightning protection measures for outdoor LED display are:
I. Requirements for the use of steel structures
Connect the steel structure with the shell of the LED display, do a good job of equipotential and grounding (general front-end grounding resistance should be ≤ 4 ohms, the machine room grounding resistance should be ≤ 1 ohm), resistance value if it does not meet the requirements, we have to do the additional artificial grounding network In addition, the lightning protector should be well grounded.
II. Requirements for the use of power cords
Install a single-phase or three-phase power supply lightning protector on the power line, the cross-sectional area of the phase line connection is not less than 10mm, and the cross-sectional area of the lightning protector with the grounding wire is not less than 16mm².
III. Requirements for the use of signals
In the signal line with a signal lightning arrester, signal lightning arrester according to the signal of the system, if the network cable is installed network signal lightning arrester, serial interface is installed DB9 interface lightning arrester, etc., the signal device connected to the grounding line cross-sectional area of not less than 1.5mm ².
IV. Requirements for the use of lightning rods
Standing in the empty mine area and no tall buildings around the LED display easy to suffer direct lightning, so must add lightning rod. Lightning rod height to rolling ball method of calculation, or 45 ° folding method (to lightning rod tip as the center, 45 ° angle cover down the place belongs to the scope of protection, but the accuracy of the calculation will be slightly inferior to the rolling ball method). After installing the lightning rod, you must also do a simple ground network to do the lightning relief channel.
V. Requirements for the use of distribution boxes
The distribution box contains optical transceivers and video servers, in order to guarantee the power supply, it is necessary to design a lightning protection socket at their power supply as a protection for the power supply. In addition, the signal lines introduced into the distribution box should all be installed with voltage and interface matching lightning protector.
