10kV spare power automatic switching action method for transformer substation

Abstract

The invention relates to a 10kV spare power automatic switching action method for a transformer substation. The method is realized based on the following wiring structures: a first main transformer, afirst bus connected with the first main transformer through a first lowering switch, a second main transformer, a second bus connected to the second main transformer through a second lowering switch,a third bus which is connected to the second main transformer through a third lowering switch, a third main transformer, a fourth bus connected to the third main transformer through a fourth loweringswitch, a first grounding transformer connected with the first bus, a second grounding transformer connected with the second bus, a third grounding transformer connected with the fourth bus, a firstsection switch connected with the first bus and the second bus, and a second section switch connected with the fourth bus and the third bus. The method comprises the following steps of detecting any bus voltage loses, when no current exists in a lowering switch of the bus, the position of the lowering switch is 1 after the reducing switch is closed, and other normal buses have voltage, and tripping off the lowering switch and a grounding transformer on the voltage-loss bus again in a time-delay manner. According to the invention, the grounding transformer can be automatically cut off after 10kV spare power automatic switching.

Description

technical field [0001] The invention relates to the technical field of substation standby automatic switching, in particular to an action method for substation 10kV standby automatic switching. Background technique [0002] Electricity consumption plays a symbolic role as an economic barometer. As a high-quality energy source, electric energy plays an indispensable role in the rapid economic development of various regions. Therefore, the safety and reliability of substation power supply systems have become the focus of attention. In order to ensure the operation stability of the power grid and reduce the short-circuit current when a fault occurs, the 10kV low-voltage side of the main transformer in the 220kV and 110kV substations is usually operated in split mode. In the split operation mode, the failure of the line or equipment will easily lead to the 10kV low-voltage side of the substation. When the side bus loses voltage and the working power supply for the normal operati...

AI Technical Summary

Problems solved by technology

When the 110kV main transformer fails and the faulty equipment is removed, the 10kV bus bar powered by the faulty main transformer loses the power supply, causing users on the 10kV feeder line to be unable to use electricity normally. At this time, the backup self-inverting action is required to restore the normal power supply of the voltage-loss bus bar

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