Method for switching phase lines of three-phase circuit and capable of preventing inter-phase short-circuit and phase change switch device

Abstract

The invention relates to a method for switching the phase lines of a three-phase circuit and capable of preventing inter-phase short-circuit and a phase change switch device, which belong to the field of transformation and distribution devices. A phase line switch and a self-resetting single-phase switch are arranged in the shell body of the phase change switch; when load switching needs to be carried out, first the self-resetting single-phase switch is controlled to be off, and the external power supply of the phase change switch device is cut off; then the moving contact of an electric rotation switch is rotated and a 'one-from-three' rotation switch method is adopted, so that the phase sequence of the phase line input end of a single-phase power supply is switched to specified phase lines; and finally the self-resetting single-phase switch to be on, and the external power supply of the phase change switch device is recovered. Because the 'one-from-more' rotation switch method is adopted, the connection with a load end is cut off when in switching, the phenomenon that two phase lines are short-circuited when the phase change switch fails to work is thoroughly overcome, the whole switching process is safe and reliable, and the safety of power supply is improved. The invention can be widely applied to the field of low-voltage power supply and the operation of power grids.

Description

technical field [0001] The invention belongs to the field of power transformation and distribution devices, and in particular relates to a method and a device 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 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. [0003] 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. [0004] Therefore, the balanced dis...

AI Technical Summary

Problems solved by technology

This circuit connection method and circuit control mode still cannot fundamentally avoid the situation that the two phase lines are connected at the same time. Once the switch fails and the two phase lines are connected at the same time and a short circuit occurs, it will cause a power supply accident. Therefore, Its safety and reliability still need to be further improved

Images