Study of Direct Carbon Emissions During Operation of Oil-Immersed Equipment in Substations

This paper addresses the overlooked issue of direct carbon emissions from oil-immersed power equipment in substations. It begins by analyzing the carbon emission behavior of such equipment during operation. Subsequently, the carbon emission levels are quantified using online oil chromatography monitoring, while differences in carbon emissions under various conditions are explored through comparative analyses of offline census data. The findings reveal that oil-immersed equipment does produce carbon emissions during operation, primarily sourced from oil-paper insulation, resulting in the generation of greenhouse gases, mainly CO2 and CH4. Based on oil chromatography online monitoring data, with due consideration for measurement errors, the calculated carbon emission level for oil-immersed equipment is 5201.25 gCO2eq/year. It emphasizes the need for attention to carbon emissions and the aging of oil-paper insulation materials, especially for equipment with lengthy operational histories, urban locations, and high voltage ratings.