Automatic three-phase switching method of load

Abstract

The invention relates to an automatic three-phase switching method of load; a switch is arranged between a three-phase power supply and a single-phase load thereof; three single-phase switches which are mutually independent and are provided with interlocking devices are arranged; the power supply input ends of the three single-phase switches are respectively connected with three phase lines of the three-phase power supply correspondingly, and the power supply output ends thereof are connected in parallel to form the power supply output end of the switch; under the interlocking function of the interlocking mechanism or a circuit with an interlocking function, only one of the three single-phase switches can be disconnected / connected so as to obtain connection of a single-phase power supply and the single-phase load; when needing to conduct adjustment / balancing on the load between three-phase power supplying circuits, a path of phase line with minimum phase current is determined according to the size of the load current of each detected power supplying circuit; a certain path of the single-phase switches in a disconnected / connected state originally is switched-on / switched-off, and the single-phase switch corresponding to the phase line with the minimum phase current is disconnected / connected, so as to lead the load to be transferred to the other phase line to conduct the single-phase power supplying from the original position of the phase line, and realize the automatic adjustment of the line load in real time.

Description

technical field [0001] The invention belongs to the field of power transformation and distribution, and in particular relates to a method for balancing load distribution between phases of three-phase power supply lines. Background technique [0002] As a whole power supply system, in its three-phase power supply line, it is very necessary to balance the load distribution among the phase lines, which not only involves the phase line current balance of the three-phase power supply line, but also involves reducing line loss , the economic operation and security of the power grid and many other issues. Due to the unbalanced three-phase load of the power supply system, the load of a certain phase is too large, which increases the line loss. At the same time, this phase line works under heavy load, which will not only affect the operation safety of the transformer, but also reduce the power supply capacity of the transformer. [0003] Therefore, the balanced distribution of phas...

AI Technical Summary

Problems solved by technology

However, the whole device is only suitable for the overall adjustment of three-phase power supply lines, and the structure of the whole device is too cumbersome, and the configuration cost is relatively high.

Images