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Influences of Corrosive Sulfur on Copper Wires and Oil-Paper Insulation in Transformers
State Key Laboratory of Power Transmission Equipment& System Security and New Technology, College of Electrical Engineering, Chongqing University, Chongqing 400030, China
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Received: 2 August 2011; in revised form: 19 September 2011 / Accepted: 9 October 2011 / Published: 12 October 2011
Abstract: Oil-impregnated paper is widely used in power transmission equipment as a reliable insulation. However, copper sulphide deposition on oil-paper insulation can lead to insulation failures in power transformers. This paper presents the influences of copper sulfur corrosion and copper sulphide deposition on copper wires and oil-paper insulation in power transformers. Thermal aging tests of paper-wrapped copper wires and bare copper wires in insulating oil were carried out at 130 °C and 150 °C in laboratory. The corrosive characteristics of paper-wrapped copper wires and bare copper wires were analyzed. Dielectric properties of insulation paper and insulating oil were also analyzed at different stages of the thermal aging tests using a broadband dielectric spectrometer. Experiments and analysis results show that copper sulfide deposition on surfaces of copper wires and insulation paper changes the surface structures of copper wires and insulation paper. Copper sulfur corrosion changes the dielectric properties of oil-paper insulation, and the copper sulfide deposition greatly reduces the electrical breakdown strength of oil-paper insulation. Metal passivator is capable of preventing copper wires from sulfur corrosion. The experimental results are helpful for investigations for fault diagnosis of internal insulation in power transformers.
Keywords: corrosive sulfur; copper wire; copper sulfide; thermal aging; oil-paper insulation; power transformer
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MDPI and ACS Style
Li, J.; He, Z.; Bao, L.; Yang, L. Influences of Corrosive Sulfur on Copper Wires and Oil-Paper Insulation in Transformers. Energies 2011, 4, 1563-1573.
Li J, He Z, Bao L, Yang L. Influences of Corrosive Sulfur on Copper Wires and Oil-Paper Insulation in Transformers. Energies. 2011; 4(10):1563-1573.
Li, Jian; He, Zhiman; Bao, Lianwei; Yang, Lijun. 2011. "Influences of Corrosive Sulfur on Copper Wires and Oil-Paper Insulation in Transformers." Energies 4, no. 10: 1563-1573.