Research on the Oil-Gas Permeability of Mixed Hollow Fiber Membrane Made by PTFE and PHFP


Article Preview

Power transformer on-line monitoring on dissolved gas in oil is one of the effective and technical means to achieve the transformer state detection and fault diagnosis, and oil-gas permeability is one of the core technologies to implement transformer on-line monitoring. The traditional methods of oil-gas separation such as vacuum method and mechanical oscillation method were unable to satisfy the requirements of transformer on-line monitoring; and the methods which were used commonly in recent years, like dynamic headspace separation, corrugated tube, carrier gas elution etc, have a high rate of gas-separation and have already been used in some on-line monitoring products. However, the problems still exist: easy formation of oil pollution, so the oil can not be recycled and the device structure is relatively complex. This paper based on the separation principle of polymer membrane, proposes mixed hollow fiber membrane made by polytetrafluoroethylene (PTFE) and polyhexafluoropropylene (PHFP), and designs an oil-gas separation test platform formed by the storage tank, oil-gas permeability tank, temperature controller and gas chromatographic analyzer etc, does laboratory research on the oil-gas permeability of the mixed hollow fiber membrane at different temperatures. The results show that, the permeability of the mixed hollow fiber membrane is obviously better than the commonly used single fluoride film or rubber film, seven fault gases H2, CO, CO2, CH4, C2H6, C2H4, and C2H2 can be separated efficiently form transformer oil within 24 hours. More to the point, the equilibrium time is short, the gas permeability is high and the test platform structure is simple, all of these advantages provide a strong guarantee for the development of on-line monitoring technology on dissolved gas in transformer oil.



Advanced Materials Research (Volumes 194-196)

Edited by:

Jianmin Zeng, Taosen Li, Shaojian Ma, Zhengyi Jiang and Daoguo Yang




W. G. Chen and M. Hao, "Research on the Oil-Gas Permeability of Mixed Hollow Fiber Membrane Made by PTFE and PHFP", Advanced Materials Research, Vols. 194-196, pp. 2480-2486, 2011

Online since:

February 2011





[1] V.G. Arakelian: Gas Chromatographic Determination of Furfural in Transformer Oil for Diagnostics of Solid Insulation of Transformers and Reactors (Electrical Engineering, USA 2003).

[2] Xiaofei Jiang, Peng Wang: Transformer Fault Online Monitoring Technology Based on Oil Dissolved Gasses Analysis (Technology Survey, China 2008).

[3] A. Mollmann, B. Pahlavanpour: New Guidelines for Interpretation of Dissolved Gas Analysis in Oil-Filled Transformers (1999).

[4] Honglei Li, Kexiong Tan: Oil-gas separation film used for transformer online monitoring (JTsinghua Univ (Sci&Tech), China 2005).

[5] T. Mcgrail, A. Wilson: On-line Gas Sensor (IEE Colloquium on Condition Monitoring of Large Machines and Power Transformers, 2001).


[6] Changchang Wang: Electrical equipment on-line monitoring and fault diagnosis (1996), p.104.

[7] Xianyong Liu, Jinsong Hu: Development of Testing Platform in Online Monitoring System of Gasses in Transformer Oil (Transformer, China 2004).

[8] Xiangping Liu: Improved Process Technique and Its Application of Chromatographic Analysis of Transformer Oil (Transformer, China 2001).

[9] Frank D, Birgit K, Gunter C.: Genetic algorithms and neural networks for the quantitative analysis of ternary mixtures using surface plasmon resonance (Chemometrics and Intelligent Laboratory Systems, 2003).


[10] Jervis.B. W, Cotton. D, Jiminez. J, Martinez. D: The quantification of gas concentrations in mixtures of known gases using an array of tin oxide sensors (The institution of Electrical Engineers, 2001).


[11] Weigen Chen: Study on the Technology of the on-line monitoring and fault dignosis for transformer insulation using the character value of oil-dissvoled gases (China 2003).

[12] Minghua Shi, Amine Bermak, Sofiane Brahim-Belhouari: A real-time architecture of SOC selective gas sensor array using KNN based on the dynamic slope and the steady state response (Proceedings of the 4th IEEE International Workshop on System-on-Chip for Real-Time Applications, 2004).


[13] Dunkui Cao: Diagnosis and troubleshooting of dissolved gas in transformer oil (China 2005).

[14] Zulong Jin: Key technologies of transformer chromatography-line monitoring system (Tranformer, China 2009).