Analysis of Dibenzyl Disulfide and Total Sulfur in Insulating Oil Using SCD

Introduction

In an oil-filled transformer, sulfur-containing compounds in insulating oil are known to cause sulfide corrosion of the transformer. Specifically, dibenzyl disulfide (DBDS), an additive of insulating oil as a metal deactivator, has been reported as a cause of sulfide corrosion. The International Electrotechnical Commission (IEC) has issued the analytical standard for DBDS in insulating oil as IEC62697-1. A sulfur chemiluminescence detector (SCD) that can be used as one of gas chromatographs can selectively analyze sulfur- containing compounds with a high sensitivity. This detector has a high selectivity and avoids the effects of contaminants and enables accurate quantification of sulfur-containing compounds. This article introduces an analysis of DBDS in insulating oil using an SCD in accordance with IEC 62697-1, and it also reports on analysis of the quantity of total sulfur in insulating oil using the equimolar response of SCD.

June 15, 2023 GMT