Factors Influencing the Interrupting Ability of SF₆ Puffer Breaker and Development of 300kV-50kA One-Break Circuit Breaker

A study on thermal‐interrupting performance improvement of SF6 gas circuit breaker by promotion of nozzle ablation

“…This PTFE nozzle is ablated by the arc exposure during the current interrupting process, contributing to a gas pressure increase in the puffer chamber . In this type of arc‐extinguishing chamber, the higher the puffer chamber pressure and the higher the pressure of the gas blown onto the arc, the better the thermal interrupting performance . It can be said that this pressure increase in the puffer chamber due to nozzle ablation is an important factor for improving the thermal interrupting performance of GCB arc‐extinguishing chambers.…”

Calculation method of gas‐pressure rising process in puffer chamber of high‐voltage SF6 circuit‐breaker

“…During current interruption process in such arc‐extinguishing chambers, gas is blown to the arc from a puffer chamber where pressure is raised by mechanical compression etc. Besides, the gas is blown to the arc through a polytetrafluoroethylene (PTFE) nozzle 1‐4 . In such arc‐extinguishing chambers, pressure rise in the puffer chamber contributes to current interruption performance 2 .…”

“…Besides, the gas is blown to the arc through a polytetrafluoroethylene (PTFE) nozzle 1‐4 . In such arc‐extinguishing chambers, pressure rise in the puffer chamber contributes to current interruption performance 2 . Thus, when developing GCBs with such arc‐extinguishing chambers, development efficiency is improved by accurately estimating, prior to manufacture, how puffer chamber pressure changes in course of interruption.…”