摘要
在35 kV及以下小电流接地系统中,大量采用电磁式电压互感器,由于铁芯的非线性特点,电压互感器在饱和时,随着激磁电流的增加励磁电抗急剧下降,存在着与系统对地容抗产生铁磁谐振的可能性。通过分析产生铁磁谐振的条件,提出了加装消谐电压互感器防止铁磁谐振的方法,并分析了相应的接线形式。
A great number of electromagnetic voltage transformers（TV） are used in the small current ground system of 35 kV or below.The nonlinear characteristic of iron core results in the fact that when TV is saturated,excitation reactance drops sharply as excitation current increases and it is likely to produce ferroresonance with system ground capacitive reactance.This paper analyzes the condition of ferroresonance production and the approach of prevention,proposes the method of adding resonance suppression TV and analyzes the corre-sponding connection form.
出处
《浙江电力》
2010年第11期28-30,34,共4页
Zhejiang Electric Power
关键词
电磁式
电压互感器
铁磁谐振
electromagnetic
voltage transformer
ferroresonance
