Application Of Medium-voltage Power Transmission Technique In The Highway Tunnel

In this paper, the analysises and contrast of the traditional common methods for reducing the loss of distribution network have been given first, we can get that shortening low-voltage line and placing the transformers near the load is better than common methods for reducing the loss of power and voltage. In present distribution model that the transformer supply area is too broad and the low-voltage line is too long, we should start with the change of distribution model, shortening low-voltage line, at the basic of it, the other measure can have good effects.So the paper changes the traditional model to construct transformer substation and connects the low-voltage into the tunnel, the tunnel of Qinling is explained in this paper, adopts medium-pressure electricity supply, and connects it to the buried transformer, reducing the section of the low-voltage and the invest of initial stages. The system achieves energy saving, high voltage quality, it is propitious to the lighting system of tunnel, use of buried transformer has low effect on the sight of tunnel ,according to partition the region of power supply, connects it and backup between each other, improving dependability can be achieved.Supervision of electric supplying based on the Controller Link net is applied, exerting its superiority, implementing the local control net of the high speed data communications and, can enhance the ability and region of control of PLC, make it easy to manage the local with computer and deal with the real-time date, remote supervision and control of electric supplying and distribution come true in highway tunnel.Medium-pressure electricity supply is the effective mode in the long distance, separate load, it has advanced technique and low cost of function and manage, is on the safe side, anyway, it has capacious foreground.