Abstract：The insulation monitoring signals of cross-bonded cables are generally weak and insulation states are difficult to distinguish under power frequency excitation. A new on-line monitoring method based on system power disturbances is proposed for insulation ageing of cross-bonded cable insulation states. This method uses the insulation admittance spectrum to distinguish the overall aging conditions, which are calculated by the current transient responses on the grounding line and cross-bonding line under the system power disturbances. The suitable types of power disturbances are analyzed and selected, and a frequency-dependent cross-bonded cable model for system power disturbances analyzing is constructed. A three-phase decoupling method is proposed to solve each phase independently for the cross-bonded scheme of the metal sheath, and the formula of calculating the insulation admittance spectrum is deduced. A simulation model is built based on vector fitting method in EMTP/ATP software. The single-phase grounding, inter-phase short circuit, capacitor switching and unloaded line charging are selected as the typical representatives of system power disturbances. The simulation results have proved that this method is correct and effective.
李露露, 雍静, 曾礼强, 王晓静, 陆家明. 基于系统电力扰动的交叉互联电缆绝缘整体老化在线监测[J]. 电工技术学报, 2018, 33(14): 3396-3405.
Li Lulu, Yong Jing, Zeng Liqiang, Wang Xiaojing, Lu Jiaming. On-Line Monitoring of Insulation Overall Aging for Cross-Bonded Cables Based on System Power Disturbances. Transactions of China Electrotechnical Society, 2018, 33(14): 3396-3405.
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2018, Vol. 33 
