Intelligent low-voltage power load distribution system and method

Abstract

Disclosed is an intelligent low-voltage power load distribution system and method. The system comprises an intelligent low-voltage power load distribution host and a plurality of intelligent power load distribution terminals. The intelligent low-voltage power load distribution host comprises a current transformer, a voltage transformer, a CPU (U6), a liquid crystal display and a three-phase communication module. One intelligent power load distribution terminal comprises a large current transformer, a voltage transformer, a high-power magnetic latching relay, a high current composite switch, a three-phase switch interlock circuit, a communication module, a phase identification circuit and a CPU (U12). According to the intelligent low-voltage power load distribution system, the distribution transformer and the load distribution terminals are provided with an intelligent low-voltage power load distribution host and intelligent low-voltage power load distribution extensions, the intelligent low-voltage power load distribution method is adopted, automatic phase switching is performed on parts of unbalanced loads, and normal operation of distribution transformer low-voltage electric load is guaranteed; the system and the method are adaptable to intelligent distribution transformer power load distribution of a power system.

Description

[0001] technical field [0002] The invention relates to a low-voltage power load intelligent distribution system and a distribution method, belonging to the technical field of power distribution and power saving in power systems. Background technique [0003] Low-voltage power load, usually refers to the load carried by the AC 380V system, which accounts for the vast majority of power load consumption in my country. The AC 380V system usually consists of three-phase four-wire, that is, phase A, phase B, phase C, and phase N (neutral wire). The loads connected to it include almost all types of modern household appliances, factory power, and agricultural irrigation. [0004] For three-phase motor loads, the three phases are in a balanced state during normal operation. For residential electricity, the load is almost all single-phase. Since the residential load is usually led out from the transformer by cables, it is difficult for the installation workers to know the diff...

AI Technical Summary

Problems solved by technology

[0005]The unbalanced three-phase load brings serious harm to the power system

[0006] Unbalanced three-phase load, the second biggest harm to the power system is the additional iron loss of the transformer

Distribution network transformers with Y / Yo connections mostly adopt a three-core column structure. When unbalanced three-phase loads or ground faults occur, there will be no zero-sequence current on the primary side and zero-sequence current on the secondary side, so the secondary side The zero-sequence current is completely the excitation current, and the zero-sequence flux generated cannot be closed in the iron core, but needs to be closed through the wall of the oil tank, so that heat will be generated in the iron box and other accessories to cause iron loss

[0007]Three-phase load imbalance, the third major harm to the power system is the generation of additional copper loss, the increase of additional copper loss will cause the transformer to heat up and reduce the operation of the transformer efficiency

[0008] Unbalanced three-phase loads, the fourth major hazard to the power system is voltage offset

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