Poor sealing of high-voltage reactors can cause an increase in moisture content in insulation oil and the appearance of moisture defects due to external water ingress or severe aging of internal solid insulation materials.There are no relevant literature reports on how to determine whether the moisture defects in high-voltage reactors are caused by external water ingress or internal aging of insulation paper based on the physicochemical indicators of insulation oil.Based on physical and chemical indicators such as oil quality,dissolved gas content in oil and water content in oil,the reasons for insulation oil to become damping in a 500 kV high-voltage reactor are analyzed,which concludes that it is not caused by external water ingress but internal solid insulation material aging.Through vacuum sealing tests on site,no channel for external water to enter the reactor is found,which further verifies that the insulation oil of that high-voltage reactor to become damping is caused by internal solid insulation material aging.
insulating oilmoistureoil qualitydissolved gas contentinsulating paperaging
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