A working method of a real-time balancing device for low-voltage distribution network lines

Abstract

The invention discloses a real-time balance device for a low-voltage power distribution network line and a working method thereof, relates to a current balance device for a medium-low voltage line and a working method thereof, and aims to fundamentally solve the problem of imbalance of three-phase current by realizing automatic real-time balance of the low-voltage power distribution network line. The real-time balance device is arranged on a low-voltage side of a transformer, and comprises a host and a plurality of slaves, wherein the host is electrically connected with the low-voltage side of the transformer through a three-phase line; each phase of the three-phase line is provided with a current transformer; the slaves are arranged between the low-voltage side of the transformer and a plurality of single-phase loads; and the slaves are connected with a plurality of single-phase loads. Through adoption of the real-time balance device and the working method thereof, three-phase current of a low-voltage power distribution network bus, current of power utilization branches and user load current under the branches can be monitored all the time; the loss of the line is reduced; the electric energy quality of a power grid is optimized; and the problem of imbalance of three-phase loads is solved fundamentally. The real-time balance device is simple in structure, and has very high economic efficiency.

Description

technical field [0001] The invention relates to the field of power equipment, in particular to a current balance device for medium and low voltage lines and a working method thereof. Background technique [0002] With the development of my country's distribution network and changes in household appliances, there are a large number of single-phase loads in the distribution network. However, the unbalanced distribution of single-phase loads leads to unbalanced three-phase loads, which has become a prominent problem in the operation and maintenance of low-voltage distribution networks. The problem. The unbalanced three-phase load will increase the loss of the power grid, which will greatly reduce the quality of the power supply voltage of the heavy-duty phase in the distribution network, resulting in a decrease in the output of the distribution network transformer and a decrease in the efficiency of power conversion. Due to the poor design and planning of the early power grid, ...

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Problems solved by technology

[0002] With the development of my country's distribution network and changes in household appliances, there are a large number of single-phase loads in the distribution network. However, the unbalanced distribution of single-phase loads leads to unbalanced three-phase loads, which has become a prominent problem in the operation and maintenance of low-voltage distribution networks. The problem

The unbalanced three-phase load will increase the loss of the power grid, which will greatly reduce the quality of the power supply voltage of the heavy-duty phase in the distribution network, resulting in a decrease in the output of the distribution network transformer and a decrease in the efficiency of power conversion.

However, this solution can only improve the problem of the distribution transformer itself to a certain extent, but cannot solve the unbalanced three-phase load of the low-voltage line in the distribution area, and the cost is relatively high

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