LI Xiaopeng,ZHUANG Yi,LU Jiping,et al.Research on Short-circuit Impedance Characteristic and Dead-zone of Supervision System for UHVDC Grounding Electrode Line[J].Automation of Electric Power Systems,2020,44(22):70-77.
LI Xiaopeng,ZHUANG Yi,LU Jiping,et al.Research on Short-circuit Impedance Characteristic and Dead-zone of Supervision System for UHVDC Grounding Electrode Line[J].Automation of Electric Power Systems,2020,44(22):70-77. DOI: 10.7500/AEPS20191025008.
Research on Short-circuit Impedance Characteristic and Dead-zone of Supervision System for UHVDC Grounding Electrode Line
Aiming at the problem of failing to operate of the existing ultra-high voltage direct current (UHVDC) grounding electrode line impedance supervision (ELIS for short) system
the fault impedance expression under different short-circuit fault conditions of the grounding electrode line is theoretically derived
and the correctness of the theoretical derivation is verified as well. Based on the fault impedance expression
taking the effects of different transition resistances
fault distances and grounding line lengths into account
the law of impedance differences between fault impedance and the normal operation impedance of the grounding electrode line is studied. The adaptability of ELIS system is also analyzed under different fault conditions
and the mechanism of failing to operate of ELIS system is explained. The research results show that the existing ELIS system has a protection dead zone
and it is difficult to correctly detect the faults with high resistance and long distance. In particular
while the length of the grounding electrode line is an integer multiple of the half wavelength for the injected signal in aerial mode
and the single-line fault distance is an odd multiple of the quarter-wavelength for the injected signal in aerial mode
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