在静电磁流体方程基础上，提出了柱状放电电弧等离子体磁螺旋不稳定性的一种新的线性分析方法。
A new linear analysis for magnetic helical instabilities of arc discharges in a cylindrical plasma is developed based on a set of electrostatic magnetohydrodynamic equations.
分析表明：变压器油中的放电不稳定，放电脉冲存在振荡分量；
Results show that, the PD pulse in oil is instable and oscillatory.
对放电中出现的破裂不稳定现象作了观测，并用表面探头观察了放电中的单极弧。
Disruptive instabilities of the discharge have been observed. Unipolar arcs are investigated with surface probes.
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