铁磁谐振的防止与加装消谐PT的接线分析

在35kV及以下小电流接地系统中，大量采用电磁式电压互感器。由于铁心的非线性特点，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。文章分析了产生铁磁谐振的条件及其防止办法，着重介绍加装消谐电压互感器的办法和相应的接线形式分析。

Prevention of Ferroresonance and Connection Analysis of Fixing PT to Avoid Ferroresonance

The potential transformer greatly introduced to 35 kV and lower power system. Fecause of nonlinear character of iron core, excitation reactance will toboggan along with increase in excitation current when the potential transformer is in saturation. It may produce ferroresonance with condensance. This paper analyses the condition of occurring ferroresonance and the means of avoiding it, especially introduces the way of fixing the PT to avoid ferroresonance and its connection analysis.