To quantitatively analyze the corrosive sulfur in transformer oil

we put forward a test methodology by gas chromatograph and sulfur chemiluminescence detection. Sulfur compounds were firstly qualitatively analyzed according to their retention time

based on which the compounds were quantified accordingly with an external calibration scheme. The preferable test conditions

including carrier gas flow rate

initial oven temperature and heating procedure for both qualitative and quantitative analysis of multiple sulfides in the transformer oil

were elucidated and finalized by comparative studies. Moreover

we analzyed the

oil samples with sulfides varying from 1×10

-6

mol/L to 5×10

-3

mol/L

and studied the reaction mechanism between different mercaptans in the transformer oil and the copper. The measured results indicate that the sulfur contents have a linear relationship with the gas chromatograph peak area

and the relative standard deviation well satisfies the specified requirements of precise quantitative and qualitative analyses. The reaction process with one kind of mercaptan during transformer oil aging may only generate corresponding disulfide

while multiple mercaptans interaction can bring about crosslinking reactions

and cause new thioether apart from corresponding disulfides. The test methodology and conditions by gas chromatograph and sulfur chemiluminescence detection were established to analyze the multiple sulfide in transformer oil

and a new mechanism of mercaptan-copper reaction was put forward. The above method can provide a useful reference for the quantitative analysis of multiple sulfide.