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LED lighting: LED street lamp power mine design Raiders of the
Lightning mainly the following four types:
1. Direct lightning stroke
Lightning directly stroke contains a great deal of energy, peak voltage up to 5000kv lightning into the ground with great destructive power. Will result in the following three effects:
(1) shed huge rich current at the time of a few microseconds, quickly pick up the high ground potential, resulting in the counterattack the accident, endangering the safety of persons and equipment.
(2) the lightning current strong electromagnetic waves, high pulse voltage sensing in power lines and signal lines.
(3) high heat lightning current flows through the electrical equipment, resulting in a fire or explosion.
2. Conduction Ray
The distant lightning struck high voltage lines or due to electromagnetic induction, transmitted by the outdoor power lines and communication lines to the indoor electrical equipment in the building.
3. Lightning
Frequent discharge between clouds produce powerful electromagnetic waves cause the common mode and differential mode interference affecting the operation of the electrical equipment.
4. Switching overvoltage
Inductive and capacitive loads in the power supply system is open or disconnected, the ends of the earth short circuit short circuit power lines, power lines can have a high-voltage pulse, the pulse voltage of up to 3-5 times the normal voltage, and can severely damage equipment. The destructive effect similar to lightning.
So how will we prevent the occurrence of lightning? Huaxing power after CLP Research Laboratory study found that, in several ways is the most effective way to prevent street lamps lightning damage:
1, the external lightning protection combined with internal lightning
General are LED street lamp external conductor material, itself the equivalent of a lightning rod, deflectors and ground network must be installed in the design of these systems constitute the external lightning protection system. The system can avoid LED street lights due to lightning directly stroke caused by fire and safety incidents. Internal lightning protection system is a street light internal ground, set voltage protection and other protection equipment. This system prevents over voltage of lightning and other forms of intrusion, causing the power to destroy the external lightning protection system can not be guaranteed. Between these two complement each other, complement each other. Internal lightning protection systems in many devices such as the shell, and out of the protected area of the cable, metal pipes should be connected to the external lightning protection system or set the overvoltage protector and equipotential connection.
2. Lightning equipotential bonding
Potential connection for the complete elimination of the use overvoltage protector of the destructive potential difference caused by lightning, power lines, signal lines, metal pipes are performed each inner layer at the interface of the protected areas must also be connected to the local equipotential various the local equipotential connections to be connected to each other, and finally connected to the main equipotential.
3 Set the lightning protection zone
LED street lights in addition to the power supply, but also set some communications equipment used to control the lights off and the brightness of these devices and power needs to be placed in the lightning protection zone to protect the area directly affected by the housing shield. Here, the electromagnetic field is much weaker.
High quality protection equipment - lightning protection module and overvoltage protection modules
The role of the SPD in the shortest possible time (nanosecond) protection system connected to the equipotential system, so that each port of the device equipotential. While the huge pulse energy will be generated in the circuit due to lightning is released by the short-circuit line to the earth, reducing the potential difference of the equipment interface end, and thus play the role of the protective equipment.
LED street lamp power supply module must not only be designed in accordance with the above requirements, and must undergo a rigorous inspection procedures:
1, with the constant-voltage output function or having a constant current output function, or both functions of both control means, should be used GB19510.12/IEC61347-2-13 safety standards test.
2, having only control LED dark and bright, flashing, color change function logic control means should be used GB19510.12/IEC61347-2-11 safety standards test.
3, if a control means of both the above-mentioned functions of both shall GB19510.12/IEC61347-2-13 safety standards test.
Practice has proved that the scientific design and rigorous testing, not only to ensure that the LED streetlight system damage by lightning, and put an end to the Lightning on the power supply common mode and differential mode interference.
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