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。
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.
出处
《高压电器》
CAS
CSCD
北大核心
2003年第3期14-15,共2页
High Voltage Apparatus
基金
上海市教委青年基金(99QF51)
