Study on the deployment principle and checking method of 220 kV fast switches

Abstract

The over-limit short-circuit current has become one of the main conflicts that restrict the operation and development of power grids. In response to the inadequacy of traditional short-circuit current suppression measures， flexible short-circuit current can be suppressed by putting fast switches into operation. In order to ensure the safe and stable operation of the power grid after fast switches are put into operation， an application analysis of 220 kV fast switches is carried out. Firstly， the principle of flexible short-circuit current suppression by fast switches is explained. Secondly， the selection of deployment for fast switches in substations and lines under different scenarios is systematically discussed； the reliability and capacity of power supply are analyzed， short-circuit current of the grid during faults is checked， and the effect of flexible short-circuit current suppression and the protection setting of the switches in different action sequences are considered. Finally， the main principles of fast switch commissioning are proposed， and an example of fast switch commissioning in substations and lines is given. Finally， the main principles of fast switch commissioning are proposed， and examples of fast switches applied in substations and lines are given to verify the correctness and effectiveness of the fast switch commissioning principles.

Keywords

• flexible suppression
• safety and stability
• 220 kv fast switch
• application analysis
• main principle