Lighting power supply system road lighting has three power supply modes: high-voltage dedicated line power supply, dedicated transformer power supply and low-voltage power supply. Due to the nature of highway lighting, only the first two modes of power supply may be considered.
High-voltage dedicated line power is suitable for long-distance line lighting, while dedicated transformer power supply is suitable for small area lighting. Because the road lighting is long and far from the city, it is difficult to obtain many reliable power sources along the way. Therefore, it is very necessary to use one high voltage power supply to supply power to the whole line after obtaining one or two high voltage power supplies. The traditional power distribution mode is to supply 10kV high-voltage cable. The box-type substation is equipped with low-voltage power supply to the lamp along the way, and the switch of the high-voltage side control system. This type of control is complicated, and the investment in high-voltage lines is large.
At present, the use of another medium voltage power supply mode in the transportation system is gradually increasing. The system is a complete package of solutions imported from France. It is fully equipped, fully functional and highly targeted. The system includes medium voltage control equipment, small capacity buried transformer, and buck-boost and pressure regulating devices. However, since the voltage of France is 5.5kV and the voltage level of China does not match, it must be processed after the transformer process, and this will inevitably increase the system loss. Due to the full introduction of the system, the price is very expensive, so the localization of the 6kV power supply level is very important, and its application will be more extensive.
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