变压器油中酸与抗氧化剂协同作用对油硫腐蚀的影响

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Abstract

In order to investigate the effect of acid and antioxidant 2, 6-di-tert-butyl-p-cresol (DBPC) on the sulfur corrosion in oil, antioxidant DBPC and two kinds of acid were added into transformer oil which contains corrosive sulfur DBDS.Then the oil-paper insulation was experienced accelerated thermal aging under N₂ environment.After the aging experiment, the copper winding was unfolded and the corrosion depositions on the copper and paper surface were observed.The GC-MS was used to measure the residual DBDS concentration in the oil.The activation energy of the corrosion reaction between DBDS and copper winding under the effect of acid was calculated using the Arrhenius equation.The results show that the corrosion degree of the copper conductor surface will be accelerated by acid; DBPC can mitigate the corrosion on copper surface to a certain extent; and Cu₂S deposition can be hardly formed on the paper surface under N₂ condition.In addition, the activation energy of the reaction between DBDS and copper winding is about 88.37 kJ/mol using the Arrhenius equation, whereas with the effect of the acid the activation energy decreased by almost 30.64%.The corrosion reaction between DBDS and copper winding will be easier to conduct under the effect of acid.

Key words： Corrosive sulfur acid DBPC oil-paper insulation transformer thermal aging

Received: 24 April 2015 Published: 12 July 2016

PACS:	TM214
	TM215

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