Low-voltage long-distance distributed weak current supply system

Abstract

The invention discloses a low-voltage long-distance distributed weak current supply system, and relates to a power supply system. At present, long-distance distributed power supply becomes a short board of a signal acquisition system. A power supply cable between the power supply and the load is larger than 1 kilometer; the number of the loads is multiple, the power supply supplies power to the loads in a long-distance distributed mode, and the power supply is a 380V alternating current power supply. A switching power supply is arranged at the load end, close to the load, of the power cable; the input end of the switching power supply is electrically connected with the A-phase output end, the B-phase output end and the C-phase output end of the power supply, and the switching power supply converts alternating current into direct current and then supplies power to a load. The switching power supply adopts three-phase power supply, the power supply efficiency is high, the line loss is less, and the switching power supply adopts three-phase rectification to ensure three-phase balance. According to the technical scheme, long-distance transmission of alternating current is adopted, then the alternating current is converted into direct current through the switching power supply, and power is supplied to the load, so that the electric efficiency is improved, the high flexibility of an alternating current system is fully utilized, and the long-distance distributed power supply requirement is better met.

Description

technical field [0001] The invention relates to a power supply system, in particular to a low-voltage long-distance distributed weak power supply system. Background technique [0002] Under the background of the Internet of Everything, communication and power supply have become difficult technologies to overcome. The biggest problem with long-distance power supply is copper loss: in the case of using a thick line of 6 square millimeters, the long-distance transmission is 1 km, and the line impedance is 6 ohms. When the load is 10A, the line loss reaches 60V. When the distance is 10km, it cannot be carried at all, and very thick copper wires must be used, which is costly. The long-distance distributed power supply has become a shortcoming of the signal acquisition system. Contents of the invention [0003] The technical problem to be solved and the technical task proposed by the present invention are to perfect and improve the existing technical solutions, and to provide...

AI Technical Summary

Problems solved by technology

At a distance of 10km, it cannot be carried at all, and a very thick copper wire must be used, which is costly

Long-distance distributed power supply has become a shortcoming of the signal acquisition system

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