WANG Fengguang,DU Xingwei,LI Li,et al.Processing Logic Against Current Transformer Disconnection of Busbar Differential Protection[J].Automation of Electric Power Systems,2023,47(14):167-173.
WANG Fengguang,DU Xingwei,LI Li,et al.Processing Logic Against Current Transformer Disconnection of Busbar Differential Protection[J].Automation of Electric Power Systems,2023,47(14):167-173. DOI: 10.7500/AEPS20221109008.
Processing Logic Against Current Transformer Disconnection of Busbar Differential Protection
According to the influencial degree of current transformer (CT) disconnection on the busbar differential protection
it can be divided into feeder CT disconnection and bus coupler CT disconnection. First
the processing logic of the current busbar differential protection for CT disconnection is introduced
and the problems of low accuracy and insufficient speed of the current logic are pointed out. Then
the differences between the busbar grounding fault and the CT disconnection characteristic are analyzed. The improved processing logic of feeder CT disconnection is proposed
which includes fault identification logic
selection logic of feeder CT disconnection and trip logic after the fault. By introducing double CT current of bus coupler to construct the dead-zone differential component
the improved processing logic of bus coupler CT disconnection is proposed by comprehensive use of check-zone differential current
bus-zone differential current and dead-zone differential current. Finally
test results of real time digital simulation system show that the improved logic can quickly and accurately select the CT disconnection
avoid the differential protection maloperation in CT disconnection with heavy-load feeder and internal high-resistance grounding fault of busbar
which maintains the rapid performance of the differential protection when the bus coupler CT disconnection occurs.
SONG Guie , LI Rui , HU Bao , et al . Application analysis of CT disconnection criterion in the bus protection [J]. Electric Engineering , 2022 ( 7 ): 93 - 94 .
TANG Zhiguo , CHEN Qi , ZHOU Xiaobo , et al . Analysis of CT failure criterion in bus protection and its improved criterion [J]. Electric Power Automation Equipment , 2018 , 38 ( 4 ): 210 - 217 .
DING Dong , MA Wei , WU Jing , et al . Analysis and treatment on open circuit fault in secondary circuit of current transformer [J]. Zhejiang Electric Power , 2018 , 37 ( 3 ): 89 - 93 .
Standardization design specification for power transformer, high voltage shunt reactor, busbar protection and auxiliary equipments : Q/GDW 1175—2013 [S]. Beijing : China Electric Power Press , 2013 .
Standardization design specification for 10 kV~110(66) kV component protection and auxiliary equipments : Q/GDW 1767—2015 [S]. Beijing : China Electric Power Press , 2015 .
ZHENG Tao , ZHUANG Xinyi , LYU Wenxuan . Negative sequence current reference selection and protection adaptability analysis of flexible DC converter station for offshore wind power [J]. Automation of Electric Power Systems , 2023 , 47 ( 3 ): 133 - 141 .
LIANG Yingyu , WANG Yaqin , REN Yi , et al . High-sensitivity current differential protection for AC-side tie line of MMC-HVDC converter station [J]. Automation of Electric Power Systems , 2022 , 46 ( 22 ): 163 - 172 .
CHEN Guoping , WANG Yuling , WANG Delin , et al . Strategy of shortening circuit breaker failure and dead zone removal time for 3/2 breaker connection based on substation area information [J]. Automation of Electric Power Systems , 2018 , 42 ( 21 ): 119 - 124 .
LIU Yongsheng , CHEN Jun , LI Juan , et al . Distributed protection scheme for DC distribution network based on current transients [J]. Automation of Electric Power Systems , 2021 , 45 ( 5 ): 159 - 167 .
WANG Fengguang , LI Li , LÜ Hang , et al . Optimized solution scheme of bus protection for dead zone fault [J]. Electric Power Automation Equipment , 2021 , 41 ( 12 ): 219 - 224 .
WU Yu , KE Lianjin . A survey of relay protection for high voltage dead-zone fault [J]. Power System Protection and Control , 2017 , 45 ( 6 ): 148 - 154 .
ZHAN Zhihua , CHEN Fufeng , ZHAN Rongrong , et al . Analysis of the influence of CT disconnection and short circuit fault on the action characteristics of distance protection [J]. Electrotechnical Application , 2014 , 33 ( 9 ): 86 - 90 .
WANG Delin , ZHENG Yuping , ZHOU Hualiang , et al . Platform and key technology for distributed bus protection based on multi-HSR network [J]. Automation of Electric Power Systems , 2017 , 41 ( 16 ): 27 - 34 .
WANG Yuling , LIU Yu , FAN Zhanfeng , et al . Scheme of finitely concentrated outdoor installation bus protection [J]. Automation of Electric Power Systems , 2017 , 41 ( 16 ): 35 - 40 .