高压电器2025，Vol.61Issue(4)：194-202,9.DOI:10.13296/j.1001-1609.hva.2025.04.022
极寒气候对油浸式变压器中水分动态分布特性的影响
Influence of Extreme Cold Climate on the Dynamic Distribution Characteristics of Moisture in Oil-immersed Transformer
段井娜 1王琼 2杨波 2明子峰 1周游 1窦冰杰2
作者信息
- 1. 长沙理工大学电气与信息工程学院智能电网运行与控制湖南省重点实验室,长沙 410004
- 2. 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司,呼和浩特 010000
- 折叠
摘要
Abstract
For exploring the reason of insulation fault of oil-immersed power transformer of wind farms in severe cold regions in winter,the transient operating temperature of the transformer with different load rates under low tempera-ture is calculated by IEEE standard.The simulation model of dynamic migration and diffusion of moisture in oil-paper insulation under dynamic hot spot temperature is set up on the basis of Fick's second law,and the transient distribu-tion characteristics of moisture in insulation board and oil is compared and analyzed.The study shows that in case of temperature rise the moisture migrates from insulation board to oil and vice verse in case of temperature decrease.However,the internal temperature of transformer is generally low due to the cold environment.In case of temperature rise,the moisture migrated out of the insulation board has no time to enter into the insulation board in the tempera-ture reduction stage,leading to gradual increase of moisture concentration in the oil with the time.However,with the sudden decrease of load in the wind farm,the internal operation temperature of the transformer and the moisture dis-solution ability are reduced accordingly.Under the same moisture content,the increase of relative humidity in the oil leads to the the polymerization and even precipitation of water molecules,which seriously endangers the safe and sta-ble operation of oil-immersed transformer.关键词
极寒气候/油纸介质/热点温度/水分动态分布Key words
extreme cold climate/oil paper insulation/hot spot temperature/dynamic distribution of moisture引用本文复制引用
段井娜,王琼,杨波,明子峰,周游,窦冰杰..极寒气候对油浸式变压器中水分动态分布特性的影响[J].高压电器,2025,61(4):194-202,9.
