DAN Shu-heng, TANG Xin-long, WANG Ji-mei. INFLUENCE OF HARMONIC COMPONENT ON THE CHOPPING CURRENT LEVEL OF VACUUM SWITCHGEAR[J]. High voltageapparatus, 2003, (3): 14-15.
DAN Shu-heng, TANG Xin-long, WANG Ji-mei. INFLUENCE OF HARMONIC COMPONENT ON THE CHOPPING CURRENT LEVEL OF VACUUM SWITCHGEAR[J]. High voltageapparatus, 2003, (3): 14-15.DOI:
系统谐波对真空开关截流性能的影响
摘要
用数值模拟的方法研究了真空开关开断含谐波的电流时可能出现的截流问题。发现由于谐波的存在
含谐波的电弧电流过零点处的电流变化率可能比基波的相应值增大或减小很多
增大的电流变化率可能使截流值减小
而减小的电流变化率可能使截流值增大
因此系统含谐波时就有可能更容易导致真空开关出现截流
从而可能导致危险的过电压
对被保护的设备造成危害
影响真空开关的应用。
Abstract
In this paper
the chopping current characteristic of vacuum switchgear is studied numerically when it interrupts the current with harmonic components. It is found that with the influence of harmonic
either the changing rate of current-zero may be decreased under some conditions
resulting in higher chopping current level
hence hazardous overvoltage
or the changing rate of current-zero may be increased resulting in lower chopping current level which makes the vacuum switchgear application safe.