Study on Different Calculation Methods of Direct Carbon Emissions from Oil-Immersed Equipment on Substations

Clarifying the level of direct carbon emissions during the operation of oil-immersed equipment in substations is crucial, yet there is limited research on accurate calculation methods for these emissions. This paper introduces various calculation approaches for direct carbon emissions from oil-immersed equipment in substations, including methods based on oil chromatography online monitoring, oil chromatography offline survey, and literature data. Additionally, a field measurement and calculation method for direct carbon emissions from oil-immersed equipment is proposed and compared with other methods. The results demonstrate that the direct carbon emission level of 0.245 gCO2eq/L/year for oil-immersed equipment, obtained from calculations based on online monitoring of oil chromatography, aligns better with literature findings. In contrast, results from calculations based on offline survey of oil chromatography tend to be lower. A direct carbon emission level of 0.074 gCO2eq/L/year for oil-immersed equipment is derived from the field measurement method, with the discrepancy arising from most of the gas produced by the equipment being dissolved in the oil. It is evident that the level of direct carbon emissions from oil-immersed equipment is relatively low compared to carbon emissions from SF6 leakage and other industrial sectors.