Research on SF6 Sulfur-containing Decomposition Components by Different Metallic Wire-type Free Conducting Particles under Positive DC Partial Discharge

摘要

Aiming to explore the wire-type free conducting particles which can produce partial discharge (PD) in DC gas-insulated equipment, an experiments were conducted to determine the influence of three kinds of metal materials (aluminum, 304 stainless steel and copper) free conducting particles on the SF SF₆ decomposition. The generation rules of SOF₂, SO₂F₂ and SO₂ and SO₂ under different metallic particles was obtained. The research showed that the kinds of metal materials had a great influence on the formation of the three SF₆ sulfur-containing characteristics decomposition components. The amount of the three decomposition components by aluminum particles were the most abundant, followed by 304 stainless steel and copper particles. Moreover, the amount and formation rates of SOF₂ were the largest, followed by SO₂F₂ and SO₂. All of these provided an experimental basis for the diagnosis of fault type in positive DC SF₆ gas insulated equipment.