Arc Reignition and Its Suppression of DC Air Circuit Breaker in High Altitude Environment

doi:10.16628/j.cnki.2095-8188.2024.01.002

Abstract

Abstract:

DC air circuit breaker (DC ACB) in high-altitude environments are prone to reignition during arc breaking,leading to an increased probability of failure.To suppress arc reignition during high-altitude breaking of DC ACB,the on-board DC ACB used in rail transit was focused,a two-dimensional magnetohydrodynamics (MHD) simulation model was established.The arc evolution process in DC ACB at different altitudes was analyzed,and their high-altitude breaking performance were optimized by increasing the transverse magnetic field and setting C-shaped splitter plates.The results show that increasing the transverse magnetic field can not cause arc reignition in DC ACB at altitudes of 2 km and 3 km,but arc reignition occurred at altitudes of 4 km and 5 km.An improved arc chamber structure with a C-shaped splitter plates was adopted on the basis of increasing the transverse magnetic field at altitudes of 4 km and 5 km,which can disconnect DC ACB in high altitude environments successfully.

Key words: DC air circuit breaker (DC ACB), high altitude, magnetohydrodynamics (MHD), transverse magnetic field, C-shaped splitter plate

CLC Number:

TM561

HUANG Hao, LI Jing, PENG Shidong. Arc Reignition and Its Suppression of DC Air Circuit Breaker in High Altitude Environment[J]. LOW VOLTAGE APPARATUS, 2024, 0(1): 6-12.

Figures/Tables 9

References 20

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海拔高度/km	平均环境温度/K	平均环境气压/kPa
0	293.15	101.32
2	288.15	80.00
3	283.15	70.00
4	278.15	62.00
5	273.15	54.00

电弧关键行为	海拔高度/km
电弧关键行为	0	3	5
电弧进入栅片时刻/ms	2.05	1.94	1.78
全栅片利用时刻/ms	4.83	4.50	4.19
第一次成功限流时间/ms	3.23	3.42	3.64
重燃时刻/ms	—	16.11	10.92

横向磁场/mT	海拔高度/km
横向磁场/mT	0	2	3	4	5
10	×	—	—	—	—
20	×	○	○	○	○
30	×	×	○	○	○
40	×	×	○	○	○
50	×	×	×	○	○
100	×	×	×	○	○