A kind of sf6 fast circuit breaker

Abstract

The invention discloses a SF 6 The fast circuit breaker is suitable for 550kV high-voltage AC transmission lines, and is characterized in that it includes: a moving contact, a static contact and an operating mechanism; the operating mechanism is connected to the moving contact and is used to drive the moving contact The head is opened with the static contact; in the SF 6 During the opening process of the fast circuit breaker, the operating mechanism drives the moving contact to move at a preset opening speed, so that the SF 6 The pre-compression time of the fast circuit breaker is less than 8.8ms; the SF 6 The short arcing time of the fast circuit breaker is less than 9.3ms. Adopting the embodiment of the present invention can effectively reduce the pre-compression time and arcing time in the opening process, effectively reduce its own full breaking time, thereby reducing the fault removal time of the power system, and greatly improving the transient stability of the power system Limit, improve the power transmission capacity of the AC transmission line of the power system and the stability of the power system.

Description

technical field [0001] The present invention relates to the field of power system technology, in particular to a SF 6 Quick breaker. Background technique [0002] In the actual operation of the distribution network, the transmission capacity of the AC transmission line is mainly restricted by the thermal stability constraints of the line and the transient stability constraints of the power system. Among them, the transient stability of the power system refers to the ability of each generator to maintain synchronous operation and transition to a new or restore the original stable operating state after the power system is subjected to a large disturbance. At present, there are many cases where the transient stability limit is lower than the thermal stability limit in the 500kV AC transmission lines within the distribution network. At the same time, a fault in the power system can easily lead to transient instability of the power grid. For the case where the transient stabil...

AI Technical Summary

Problems solved by technology

In the process of implementing the present invention, the inventors have found that the prior art has at least the following problems: the fault removal time of the current specified transmission line is relatively long, which accelerates the deterioration of the transient stability characteristics of the power system during the fault and restoration process, and is the cause of temporary A key reason for the low state stability limit, the transmission capacity of AC transmission lines is greatly limited

Images