In ungrounded distribution system the single-phase-grounding and the ferro-resonance caused by the PT (Potential Transformer) are of the frequent accidents.
在中性点非直接接地电网中,单相接地及由电压互感器(PT)引起的谐振过电压均是多发性的事故。
PT breaking and ferro-resonance caused by single-phase grounding and PT saturation are common faults in medium-low voltage power networks, which make voltage abnormal.
With examples this paper analyses the phenomenon of ferro-resonance caused by the grading capacitor and the effect of busbar's stray capacitance on ferroresonance.