刘福源, 王航, 夏湛然, 杨斌, 杨帅, 周承科. 交叉互联高压电缆护层保护器故障对同回路两端护层电流相量差的影响[J]. 高电压技术, 2023, 49(3): 1244-1253. DOI: 10.13336/j.1003-6520.hve.20220675
引用本文: 刘福源, 王航, 夏湛然, 杨斌, 杨帅, 周承科. 交叉互联高压电缆护层保护器故障对同回路两端护层电流相量差的影响[J]. 高电压技术, 2023, 49(3): 1244-1253. DOI: 10.13336/j.1003-6520.hve.20220675
LIU Fuyuan, WANG Hang, XIA Zhanran, YANG Bin, YANG Shuai, ZHOU Chengke. Influence of the Sheath Voltage Limiter Fault on the Sheath Current Phasor Difference Between the Two Ends in the Same Sheath Loop in Cross-bonded HV Cables[J]. High Voltage Engineering, 2023, 49(3): 1244-1253. DOI: 10.13336/j.1003-6520.hve.20220675
Citation: LIU Fuyuan, WANG Hang, XIA Zhanran, YANG Bin, YANG Shuai, ZHOU Chengke. Influence of the Sheath Voltage Limiter Fault on the Sheath Current Phasor Difference Between the Two Ends in the Same Sheath Loop in Cross-bonded HV Cables[J]. High Voltage Engineering, 2023, 49(3): 1244-1253. DOI: 10.13336/j.1003-6520.hve.20220675

交叉互联高压电缆护层保护器故障对同回路两端护层电流相量差的影响

Influence of the Sheath Voltage Limiter Fault on the Sheath Current Phasor Difference Between the Two Ends in the Same Sheath Loop in Cross-bonded HV Cables

  • 摘要: 高压电缆护层保护器故障对同护层回路两端护层电流相量差的影响规律是制定护层接地故障判据的理论基础。为识别护层保护器故障,在器件级别构建了电容和非线性电阻并联的护层保护器故障等效电路,在系统级别构建了三相9段交叉互联电缆在护层保护器正常和故障时的数学物理模型,推导了护层保护器故障阻抗与同护层回路两端直接接地点护层电流相量差的传递函数。以110 kV电缆为仿真案例,结果表明:同回路两端护层电流相量差既可以区分正常和故障状态,又可以区分不同位置护层保护器金属性接地故障;护层电流相量差相角对金属性接地和低阻接地敏感,同回路首端和末端护层保护器发生100 Ω接地故障时,护层电流相量差相角偏差范围分别为17.9°~24.9°和33.4°~51.1°;216 Ω接地故障时护层电流相量差相角偏差范围分别为9.4°~13.6°和12.4°~17.5°。护层电流相量差受电缆3小段不等长和相电流影响显著,受地阻抗和相电压波动影响不显著。

     

    Abstract: The influence of sheath voltage limiter faults on sheath current phasor difference between the two ends in the same sheath loop of high voltage cables is the theoretical base of the fault diagnosis criteria. At device level, the equivalent circuit of sheath voltage limiter consists of a parallel capacitance and nonlinear resistance is modelled in this paper. At system level, a mathematical and physical model of cross-bounded cable system under normal and faulted condition is formulated, then the transfer function between the fault impedance of sheath voltage limiter and the phasor difference of the sheath current measured on the two solid grounding points in the same sheath loop is derived therefore. The results of the simulation on 110 kV cable system show that not the faulted sheath voltage limiter can be distinguished by the sheath current phasor difference under metallic grounding faults. Phase of the sheath current phasor difference is sensitive to metallic and low resistance grounding faults, whilst its the phasor deviation of the sheath current phasor difference between 100 ohms grounding fault in left and right sheath voltage limiter and normal condition range from 17.9°~24.9° or 33.4°~51.1°; and 9.4°~24.9 or 9.4°~24.9° under 216 ohms grounding fault. Besides, unequal length of minor sections and phase current fluctuation have significant influence on the sheath current phasor difference, and the grounding resistance and phase voltage fluctuation have insignificant impact on the sheath current phasor difference.

     

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