Abstract
Within a high voltage substation, power transformer bushings are key components and an assessment of their condition is important to ensure operational reliability. Bushings represent a large proportion of transformer failures, where most issues are as a result of moisture ingress. Moisture ingress affects the distribution of the electric field and changes the capacitance and dissipation factor (tanδ) of the insulation. In this paper, a numerical model is built for an oil impregnated paper (OIP) condenser bushing. The simulated dielectric frequency response (DFR) dependence of transformer oil and OIP with varying moisture content is given. Simulations are made of the AC and very low frequency (approximated to DC) potential and electric field distributions. Furthermore, the capacitance and dissipation factor over a frequency range of between 1mHz to 1kHz is presented. The results are found to be consistent with typical bushing manufacturers' data.
Original language | English |
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Title of host publication | 2012 47th International Universities Power Engineering Conference (UPEC) |
Publisher | IEEE |
ISBN (Electronic) | 9781467328562 |
ISBN (Print) | 9781467328548 |
DOIs | |
Publication status | Published - 31 Dec 2012 |
Event | 2012 47th International Universities Power Engineering Conference - London, United Kingdom Duration: 4 Sept 2012 → 7 Sept 2012 Conference number: 47th |
Publication series
Name | Proceedings of the Universities Power Engineering Conference |
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Conference
Conference | 2012 47th International Universities Power Engineering Conference |
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Abbreviated title | UPEC 2012 |
Country/Territory | United Kingdom |
City | London |
Period | 4/09/12 → 7/09/12 |
Keywords
- bushing
- capacitance
- dielectric frequency response
- dissipation factor
- electric field
- finite element method
- high voltage
ASJC Scopus subject areas
- Energy Engineering and Power Technology