Analysis on moisture in oil-paper insulation using frequency domain spectroscopy

作者：Lü Wei^*; Wu Guang Ning; Zhou Li Jun; Liu Jun; Peng Gang; Gao Zong Bao

来源：High Voltage Engineering, 2010, 36(12): 3015-3020.

• Breakdown voltage
• Complex permittivity
• Dielectric response
• Dielectric response method
• Electrical performance
• Frequency domain spectroscopy
• Impact performance
• Insulation system
• Oil gaps
• Oil immersed transformers
• Oil paper insulation
• Oil-paper insulation system
• Operational life
• Paper insulation
• Power systems
• Pressboard insulation
• Remaining life
• Test results
• Transformer insulation

To estimate the moisture of oil-paper insulation, and to effectively assess the condition and remaining life of transformer insulation, the frequency domain spectroscopy measurements based on dielectric response method were used to model the oil-paper insulation system. Then the dielectric spectroscopy of oil-paper insulation system was tested to give the formula of the moisture. The influence of oil gap on the test results of oil-paper insulation response was discussed. The results show that the influence of oil gap on the test results is less than 10%, there is a function among complex permittivity of oil-paper insulation, moisture and temperature, and frequency domain spectroscopy method can effectively estimate the moisture of oil-paper insulation. At present oil-immersed transformer is the most widely used in power system, and oil-paper insulation of oil-immersed transformer directly affect the electrical performance and operational life. Water is an important factor which impact performance of oil and paper insulation, and water will reduce the breakdown voltage of the insulation system and increasing dielectric loss. For estimating moisture of oil-paper insulation, and make effective assessment of transformer insulation condition and remaining life, the frequency domain spectroscopy measurements based on dielectric response method were used to model oil-paper insulation system. Then the dielectric spectroscopy of oil-paper insulation system was tested. And give the formula of the moisture. The influence of oil gap on the test results of oil-paper insulation response was discussed. The results showed that the influence of oil gap on the test results is less than 10%, there is a function between complex permittivity of oil-paper insulation, moisture and temperature, and frequency domain spectroscopy method can effectively estimating moisture of oil-paper insulation.

• 出版日期2010
• 单位西南交通大学