Study on the performance of underground XLPE cables in service based on tan delta and capacitance parameters
The performance of underground XLPE cables in service is critical because of ageing mechanisms influences. Many appropriate techniques can be used to evaluate the performance of aged and unaged underground XLPE cables. One of the techniques is based on tan delta and capacitance parameters of the cab...
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| Main Authors: | , |
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| Format: | Conference or Workshop Item |
| Published: |
2007
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/3292/ http://eprints.uthm.edu.my/3292/1/10EEE_16.pdf |
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| Summary: | The performance of underground XLPE cables in service is critical because of ageing mechanisms influences.
Many appropriate techniques can be used to evaluate the performance of aged and unaged underground XLPE
cables. One of the techniques is based on tan delta and capacitance parameters of the cable insulations. This
study focuses on underground XLPE cables which rated at 11 kV and 22 kV for both 1-core and 3-core types.
Tan delta and capacitance data of underground XLPE cables are obtained using a Schering bridge instrument.
Tan delta and capacitance measurements are performed at ambient temperature (about 26.6oC) and at 50 Hz
power frequency. The analysis of data shows that tan delta values increased in proportion to the aging time of
the cables. Meanwhile the data analysis of the capacitance values of the cable insulator shows that the values of
capacitance inconsistent. From this study, tan delta parameter is more accurate and appropriate parameter for
evaluating performance of underground XLPE cables as compared to capacitance parameter. Therefore, the
finding of this study shows that aging mechanisms contributes the deteriorations of underground XLPE cable
insulations in service and consequently the value of tan delta increases with aging time of the cables. |
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