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2 Power Systems
There are 3 lines for led street light, namely L line, N line, and GND. The power system of the LED lamps can be single-phase & three-phase power
supply. Wiring is showed as the one in picture 1 and single-phase two-wire system is prohibited. When using three-phase power supply, TN-S system
is required, namely three-phase five-wire system. The wiring is showed below in picture 2 and three-phase four-wire system is prohibited. These two
power system needs to ensure that the GND is connected with the ground of the main power supply system.
Three-phase five-wire system is widely applied in most of the cases, and the electrician needs to take care of the three-phase load balancing. And if there
is no balance for the three-phase load,1) there will be huge surge current at the input terminal of the load when turn on/off the switch,(And this high
current is caused by high voltage in a short time at the grid, like a wave. When large-capacity electrical equipment turns on/off, there will be surge voltage
caused by the inductance in the grid, which will cause the surge current to damage the LED driver of theLEDs ). The phase that is caused by low voltage
may prevent the control circuit of the led lamp from being normal working state, thus affect the energy saving or the light-efficiency of the LED.
Picture 1 Wire of Single-phase three-wire system
(notice the balance of the three phases)
Picture 2 Wire of three-phase five-wire system (notice the balance of the three phases)
3 (Power lines)
LED Street Light uses three-phase output current and stable voltage, therefore the following points needs to be taken care in case that the driver & LED
is damaged by them.
Make sure that the AC line from the low-voltage distribution is provided by the specific transformer, the input AC voltage is not exceeding the working
voltage range of the LED lamp. Public transformer is prohibited because of the low power quality and huge voltage fluctuation. Current harmonics,
caused by the current variation and the driver resistance, will change into voltage harmonics and come to the power distribution cabinet. This sometimes
leads to the unbalanced current, overload and poor electromegnatic power ambience
Power lines shared with HPS, metal halide and other high-intensity discharge lamps is not allowed because of the unstable arc discharge in the tube
at the initial phase, which can leads to surge voltage as high as 2-6KV.
Manual for NUALIGHT LED Street Light
Manual for NUALIGHT LED Street Light
Specific power line can not power the large electrical equipment or factories temporarily or for a long time. Like: electric welder, mixer, impact drill,
packing machine, large-scale heavy equipment, cement factory,steel plant .etc. Because these machines and working conditions makes the instability
of the state grid.
4 Requirements of the installation for the driver
4.1 Reliable grounding
- The Led lamp and the pole needs to be reliable grounded in case of thunder shock. In order to make sure
the safety of the electricity, connecting the ground line with the N-line is not allowed, and unconnected
ground line of the LED lamp is also prohibited.
4.2 Connection of the power cord
- When connect the LED lamp and the AC input, please make sure that the cord needs to be inserted into
the pole and then connect the AC input of the driver. Let the connector upward and then wrap with insulation tape or waterproof junction box to
prevent the connecting part from the moisture or the rain.
Otherwise, there will be security risks on the one hand, and on the other hand, huge voltage fluctuation will ruin the LED and the driver. Please
refer to the connection line of the picture 3 below.
4.3 Diameter requirements of the N-line
- In many cord(three-phase power supply),the diameter of the N line is small, which has a great impact on 3 pieces led street light with
single-phase power supply. Because the led street light is powered by three-phase five-wire system, which requires the same diameter
of A,B,C three phase line to adapt to the Schematic diagram of use waterproof junction box
connect the output of
the waterproof wiring
box with the LED
power supply
waterproof
wiring box
Flood
Use insulation tape schematic bandage
3 Recommended connection method
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