期刊
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
卷 27, 期 3, 页码 900-908出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TDEI.2019.008502
关键词
Aging; Power cables; Power cable insulation; Electric fields; Current measurement; XLPE insulation; Power distribution; aging; conductivity; finite element methods; electric fields
资金
- National Science Foundation of China [51977187]
- State Key Laboratory of HVDC, Electric Power Research Institute, China Southern Power Grid [SKLHVDC-2019-KF-18]
- Science and technology innovation 2025 Key Project of Ningbo City [2018B10019]
- National Key R&D Program of China [2018YFB0904400]
- Fundamental Research Funds for the Central Universities [2018QNA4017]
- One-hundred Talents Program of Zhejiang University
This paper presents an estimate for the influence of service time on the conduction current characteristics of a 10 kV AC XLPE. The experimental conduction current results show that the space charge accumulation threshold increases with service time. Fourier transform infrared (FT-IR) and differential scanning calorimetry (DSC) experiments show increased thermo-oxidative aging and reduced crystallinity as the service time increases. This results in deeper traps in the XLPE material which can be verified from isothermal surface potential decay experiments. Based on the experimental results, the numerical analysis of thermo-electric fields is carried out for 10 kV AC XLPE cables with different service times under bipolar DC operation mode. It shows that the DC power for 10 kV AC XLPE cable in bipolar DC operation is higher than the AC power, whereas the DC operating voltage and DC power increases with the service time. In order to ensure a safe and long service life of the cables in DC operation, a conductor temperature of 60 degrees C and DC operating voltage of 11 kV are recommended for 10 kV AC XLPE cables in bipolar DC operation.
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