基于绝缘油理化指标的某高压电抗器受潮原因分析

Cause Analysis of Moisture Defects for High-voltage Reactor Based on Physicochemical Indicators of Insulating Oil

摘要:

高压电抗器因密封不良从外部进水或其内部固体绝缘材料严重老化生成水，均会导致绝缘油中水分增加并表现出受潮缺陷。针对某500 kV高压电抗器绝缘油受潮缺陷，基于油质、油中溶解气体含量、油中水分等绝缘油理化指标对其受潮原因进行分析，判断出该受潮缺陷不是外部进水而是内部固体绝缘材料老化引起的；通过现场真空密封试验，未发现外界水分进入电抗器的通道，进一步验证了所用方法分析判断受潮原因的正确性。

Abstract:

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.