Space charge characteristics of high voltage retired cable

作者：Liu, Gang^*; Xie, Yue; Yang, Wanqi; Li, Licheng

来源：High Voltage Engineering, 2016, 42(11): 3607-3615.

DOI：10.13336/j.1003-6520.hve.20160830004

• 110kV
• Aging status
• Charge accumulation
• Charge decay
• PEA-method
• XLPE cables

The accumulation and dissipationof space charge in insulation layer caused by cable aging has great influence on insulation property. Consequently, two retired and a spare 110kV XLPE cables were chosen and the space charge distribution of different layerswas measured by pulsed electro-acoustic(PEA). Meantime,the relationship between space charge characteristics and the cable aging was analyzed preliminarily. The results show that the accumulation of positive charge and heterocharge (except the positive charge)in different locations increases due to cable aging;for the diversity of unit volume mean density is tiny, the status of cable aging is difficult to be estimated;at the beginning of charge dissipation phase, theunitcharge density risen by the charge detrapping and the diversity of initial value of different layer is quite different;then the charge releasing rate decreases gradually with time so that it will be suitable for assessment of the trap energy level change of cable insulation. In conclusion, the change of unit charge density and diversity of trap energy level will be better for the assessmentof the cable aging state.

• 出版日期2016-11-30
• 单位华南理工大学