How to lightning protection for LED lights ?
Thunderstorm for contains enormous energy, peak voltage up to 5000kv of lightning into the ground, with great destructive power. It will result in the following three effects:
(1) huge current-rich stream to within a few microseconds, so quickly pick up the high ground, resulting in a counterattack accident, endanger the safety of persons and equipment.
(2) have a strong lightning current waves, power lines and signal lines in high voltage pulse induced.
(3) the lightning current flows through the electrical equipment generates high heat, causing a fire or explosion.
2. Conduction Ray
Distant lightning struck a high-voltage line or by electromagnetic induction, by the outdoor power lines and communication lines spread within the building indoor electrical equipment.
Frequent discharge between clouds strong electromagnetic waves cause the common mode and differential mode interference and affect operation of electrical equipment.
4. Switch Overvoltage
Power supply system of inductive and capacitive load is turned on or off, the earth short-circuit, short-circuit power lines, etc., can produce high-voltage pulse, the pulse voltage up to normal voltage of 3-5 times in the power line, can seriously damage the device . Destructive effect of a lightning strike.
So how will we prevent the occurrence of lightning it? After CLP, Star Power Research Laboratory study found several ways to guard against street by lightning destroyed the most effective way:
1, the external and internal lightning lightning combination
Now the usual external led lights are conductor material itself is the equivalent of a lightning rod, the design must be installed deflectors and ground network, these systems constitute the external lightning protection system. The system can be avoided due to the LED lights direct lightning strikes cause fire and personal accidents. Internal lightning protection system is a guiding light inside through the ground, set the voltage protection and other ways to protect the equipment. The system prevents lightning over-voltage and other forms of intrusion, resulting in the destruction of the power supply, which is an external lightning protection system can not be guaranteed. Between the two complement each other, complement each other. Internal lightning protection system in many devices such as housing, cable and out of protected areas, metal pipes, etc. must be connected to the external lightning protection system or set overvoltage protection, and other potential connection.
2. Lightning equipotential bonding
Eliminate destructive potential difference caused by lightning, power lines, signal lines, metal pipes and so use overvoltage protection equipotential bonding at the interface of each of the inner protection zone must also be local equipotential connection, each local equipotential connection to connect to each other, and finally connected to the main equipotential place.
3. Set the lightning protection zone
Currently LED lights in addition to the power supply, but also set up some communication device for controlling the lights off and brightness, and power of these devices are to be resettled in the lightning protection zones, protected areas directly affected by the housing shield. The electromagnetic field is much weaker here.
4. high quality protective equipment - lightning and overvoltage protection modules module
The role of mine is in the shortest possible time (nanosecond) protection system will be connected to the equipotential system, so that each device port potential. While the great circuits due to lightning pulse energy generated by shorting discharged to the ground to reduce the potential difference between the ends of each interface device, which play the role of protective equipment. CLP China Star R & D team that, LED street lamp power supply module in accordance with the above requirements not only to design, but must go through rigorous testing procedures.
1, with a constant voltage output control means having a function or constant current output function, or both functions of both should be used GB19510.12 / IEC61347-2-13 safety standards test.
2, the control device only has a control LED light and dark, flashing, color changes and other logic functions should be used GB19510.12 / IEC61347-2-11 safety standards test.
3. If a control device combines the functions of both the above, it should be tested in accordance with GB19510.12 / IEC61347-2-13 safety standards.
Practice has proved that, through scientific design and rigorous testing, not only to ensure that the LED street light system are not subject to lightning damage, lightning and eliminate the power supply common mode and differential mode interference.