Studies Concerning the Fast Ageing by Thermal Cycling of Power Cables

被引：0
|
作者：
Lingvay, Iosif [1 ]
Stancu, Cristina [1 ]
Budrugeac, Petru [1 ]
Cucos, Andrei [1 ]
Lingvay, Carmen [1 ]
机构：
[1] Natl Inst R&D Elect Engn, Bucharest, Romania
来源：
2011 7TH INTERNATIONAL SYMPOSIUM ON ADVANCED TOPICS IN ELECTRICAL ENGINEERING (ATEE) | 2011年
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D O I：
暂无
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
In the present paper the results concerning the structural modifications and dielectric properties of polyethylene insulations taken from a medium voltage cable (20 kV) subjected to 120 thermal cycles between -35 degrees C and + 100 C are presented. The structural modifications were investigated by thermal analysis methods (TG, DTG and DTA), showing that during the thermal cycling the degree of cross-linking of polyethylene increases and the degree of crystallinity decreases. Dielectric modifications of polyethylene due to thermal cycling were determined by using the dielectric spectroscopy method in range 10(-2) divided by 10(6) Hz, for 30 degrees C but also for 100 degrees C. After 120 thermal cycles the results obtained show that tg delta for 30 degrees C increases slowly for frequencies higher than 100 Hz and substantial for frequencies lower than 100 Hz. This increase is more pronounced for 100 degrees C (up to 100 %) especially for frequencies between 10(-2) divided by 2.10(3) Hz.
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