中国电机工程学报2026，Vol.46Issue(8)：3442-3453,中插31,13.DOI:10.13334/j.0258-8013.pcsee.250045
PTFE喷口烧蚀退化对C4F7N环保气体断路器压力建立的影响
Effect of PTFE Nozzle Ablation Degradation on Pressure Buildup in C4F7N Eco-friendly Gas Circuit Breaker
摘要
Abstract
C4F7N,as the most promising SF6 alternative gas in high-voltage switchgear,is crucial for advancing large-capacity eco-friendly gas circuit breakers by studying pressure buildup characteristics within the chamber during the arcing process.This study establishes an arc magnetohydrodynamic simulation model that accounts for nozzle ablation and degradation,with its accuracy verified through type test.Then,the pressure buildup characteristics of C4F7N/CO2/O2 gas mixture and its differences from SF6 are investigated,and the influence of different arcing times and interrupter structures on interruption performance are analyzed.The results indicate the following:The simulated arc voltage of C4F7N gas mixture,considering nozzle ablation and degradation,aligns well with experimental results.The peak pressure in the expansion chamber with SF6 is nearly 35%lower than that with the C4F7N gas mixture,but the latter exhibits a faster pressure relief rate,and the increased energy in the chamber due to the hot PTFE vapor produced by the nozzle ablation is the main reason for the pressure increase.At the zero-crossing moment,the pressure in the expansion chamber is approximately 14%higher without considering nozzle degradation than with degradation,and the throat enlargement due to nozzle degradation significantly reduces the pressure buildup effect and accelerates the relief process.An improved design with a moderately reduced nozzle throat diameter and an extended throat length can establish higher pressure in the expansion chamber and enhance interruption performance by improving convective cooling.关键词
全氟异丁腈(C4F7N)/气体断路器/喷口烧蚀/退化/压力Key words
C4F7N/gas circuit breaker/nozzle ablation/degradation/pressure分类
信息技术与安全科学引用本文复制引用
曹闽川,汪冠宇,张博雅,石钰莹,邓竣巍,李兴文..PTFE喷口烧蚀退化对C4F7N环保气体断路器压力建立的影响[J].中国电机工程学报,2026,46(8):3442-3453,中插31,13.基金项目
国家自然科学基金项目(52422707).Project Supported by National Natural Science Foundation of China(52422707). （52422707）
