添加剂对低热下油/纸绝缘体系产气特性的影响

EFFECTS OF ADDITIVES ON STRAY GASSING OF OIL-PAPER COMPOSITE UNDER THERMAL STRESS

为更好地分析运行中的变压器设备真实的产气特性,在120℃下考察克拉玛依40号绝缘油基础油(简称基础油)、抗氧剂2,6-二叔丁基对甲酚(DBPC)及金属钝化剂N-二乙基己基-氨甲基-甲基苯并三氮唑(Irgamet39)对油纸绝缘体系产气特性的影响。结果表明:油纸绝缘体系中产生的溶解气含量受添加剂种类、绝缘油氧化、绝缘纸板热降解、绝缘纸板吸附作用等多因素影响;抗氧剂DBPC可通过抑制绝缘油老化使油纸绝缘体系中氢气和烃类气体含量大幅降低,同时DBPC也促进绝缘纸板老化产生更多的CO和CO2;金属钝化剂Irgamet39虽然会使油纸绝缘体系中产生较高氢气量,但与纯油产生的氢气量相比呈现出大幅下降趋势,分析认为是由于绝缘纸板吸附金属钝化剂引起的;Irgamet39可促进绝缘纸板老化,使其产生更多的CO和CO2,但对烃类气体的产生基本无影响。

In order to study the real gassing characteristics of transformers in operation,effects of base oil,antioxidant DBPC and metal deactivator Irgamet39 on stray gassing of oil-paper composite insulation at 120℃were studied.The test results showed that stray gassing of oil-paper was largely influenced by additive types,oil oxidation,insulation pressboard thermal degradation,and insulation pressboard adsorption.Antioxidant DBPC could greatly reduce the content of hydrogen and hydrocarbon gas in oil-paper insulation system by inhibiting the aging of insulating oil.However,DBPC could also promote the aging of insulating paperboard to produce more CO and CO2.The metal deactivator Irgamet39 produced a higher amount of hydrogen in the oil-paper insulation system,and showed a sharp downward trend,compared with the amount of hydrogen produced by pure oil,which was considered to be caused by the adsorption of metal deactivator on the insulation board.At the same time,Irgamet 39 could promote the pressboard aging leading to more CO and CO2,while Irgamet39 made no obvious influence on hydrocarbon gas.