由于母线PT励磁特性的非线性，铁磁谐振频繁发生在中性点接地变电站的空母线上。
Ferroresonance due to the saturation of PT magnetizing characteristics is frequently reported to happen on the busbars of neutral grounded substations.
分析工频铁磁谐振时，选择正确的非线性电感励磁特性类型至关重要。
It is vital to choose the right excitation characteristic of the nonlinear inductor when analyzing ferroresonance.
同时，通过改变消弧线圈铁芯结构，解决了在零励磁情况下电感的非线性问题，减少了铁磁谐振对电网造成的危害；
The core structure of the arc suppression coil is improved to solve the nonlinearity of voltage with zero-excitation. The harm of ferro-resonance is thus reduced.
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