摘要详情

ID / 提交时间

182 / 2024-04-15 18:12:07

标题

Breakdown Characteristics of a Fluoronitrile Mixture Gas According to Oxygen Content for High-Voltage Power Equipment Application

关键字

Fluoronitrile mixture gas,oxygen content,breakdown

主题及专题

1)Emerging HV Switching Technologies

状态

全文录用

作者

Jin-Yong Na / Hanyang University

Ryul Hwang / Hanyang University

Jin-Long Wu / Hanyang University

Bang-Wook Lee / Hanyang University

摘要

Fluoronitrile (C₄F₇N) has many advantages, such as high dielectric strength, low global warming potential (GWP), and short atmospheric lifetime compared to sulfur hexafluoride (SF₆). In particular, the C₄F₇N/CO₂ mixture gas has excellent applicability in high-pressure environments and is gaining attention as an insulating media for eco-friendly high-voltage gas insulated switchgear (GIS). Recently, a method of adding oxygen (O₂) to fluorinated mixture gas has been proposed to suppress the formation of carbon soot in insulating gases. However, research on the influence of adding more than 10% O₂ to the dielectric strength of fluorinated mixture gas has been insufficient. Therefore, in this paper, the influence of a high-proportion O₂ addition on the dielectric characteristics of C₄F₇N 5%/CO₂ was investigated. The breakdown tests for power frequency and negative lightning impulse voltage under weakly non-uniform electric field were conducted by increasing the O₂ content in C₄F₇N 5%/CO₂ to 5%, 10%, and 20%. From these experiments, it was confirmed that the addition of 5% O₂ to the C₄F₇N 5%/CO₂ resulted in an improvement of about 10% in dielectric strength at pressure below 0.4 MPa. However, the dielectric strength decreased when the O₂ contents were 10% and 20%. Furthermore, the dielectric strength at pressures above 0.6 MPa decreased by more than 10% due to the addition of O₂, regardless of the proportion.