TY - GEN
T1 - AC Current Interruption by Liquid Nitrogen in a Superconducting Fault Current Limiting Switchgear
AU - Xiang, Bin
AU - Li, Hongxu
AU - Gao, Lei
AU - Geng, Yingsan
AU - Liu, Zhiyuan
AU - Wang, Jianhua
AU - Pei, Xiaoze
AU - Tu, Youping
N1 - Funding Information:
This work is supported by National Natural Science Foundation of China (51877166, 51907153 , 51911530195) and the China Postdoctoral Science Foundation Funded Project (No.2019M653632) and the State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(Grant No.LAPS20008).
PY - 2020/10/16
Y1 - 2020/10/16
N2 - A new switchgear named Liquid Nitrogen Insulated metal-enclosed Switchgear (LNIS) is proposed, which uses LN2 as an insulation medium to substitute SF6in Gas Insulated metal-enclosed Switchgears (GIS). Power loss of the LNIS is only about 1/8 of the same level GIS, making the novel switchgear a fascinating technology for future power systems. To make the switchgear more compact and efficient, LN2 is also used as an arc extinguishing medium of disconnecting switches. Thus, closed-loop current that can up to thousands of amps should be interrupted by LN2. However, AC current interruption ability of LN2 is still unknown. The objective of this paper is to obtain the AC current interruption properties of LN2. Experiments are conducted with currents ranging from 700 A to 4 kA. AC current of 2950 A (Peak value) is interrupted by LN2 successfully. The maximum arc energy during the interruption is about 437 J, far less than the Joul heat generated by the rated current flow. Arc energy during interruption doesn't burn extra burden on the cooling system. Thus, AC current interruption ability of LN2could meet requirements for LNIS.
AB - A new switchgear named Liquid Nitrogen Insulated metal-enclosed Switchgear (LNIS) is proposed, which uses LN2 as an insulation medium to substitute SF6in Gas Insulated metal-enclosed Switchgears (GIS). Power loss of the LNIS is only about 1/8 of the same level GIS, making the novel switchgear a fascinating technology for future power systems. To make the switchgear more compact and efficient, LN2 is also used as an arc extinguishing medium of disconnecting switches. Thus, closed-loop current that can up to thousands of amps should be interrupted by LN2. However, AC current interruption ability of LN2 is still unknown. The objective of this paper is to obtain the AC current interruption properties of LN2. Experiments are conducted with currents ranging from 700 A to 4 kA. AC current of 2950 A (Peak value) is interrupted by LN2 successfully. The maximum arc energy during the interruption is about 437 J, far less than the Joul heat generated by the rated current flow. Arc energy during interruption doesn't burn extra burden on the cooling system. Thus, AC current interruption ability of LN2could meet requirements for LNIS.
KW - AC current interruption
KW - arc energy
KW - Liquid Nitrogen Insulated metal-enclosed Switchgear (LNIS)
KW - LN2 switch
UR - http://www.scopus.com/inward/record.url?scp=85099282074&partnerID=8YFLogxK
U2 - 10.1109/ASEMD49065.2020.9276340
DO - 10.1109/ASEMD49065.2020.9276340
M3 - Chapter in a published conference proceeding
AN - SCOPUS:85099282074
T3 - 2020 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD 2020
BT - 2020 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD 2020
PB - IEEE
CY - U. S. A.
T2 - 2020 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD 2020
Y2 - 16 October 2020 through 18 October 2020
ER -