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Previous studies indicate that cellulose bridges in oil-pressboard insulation are self-generating, and can influence the characteristics of partial discharges (PDs) under DC voltage. In this letter, further experiments based on an optical-electric experimental platform were conducted to determine the generating sequence between cellulose bridges and PDs, and to provide visual evidence of bridges' effects on PD process. The results show that the generation of cellulose bridges can be divided into three stages, which can be finished at a DC voltage lower than PD inception voltage (Updiv). With the increase of the applied DC voltage, the generating time of the first bridge decreases. In addition, by using shadow photographic method, a bridge-triggered discharge in oil was observed. Further analysis indicates that cellulose bridges generate gaseous paths to discharges in oil due to its high conductivity.
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Li et al. (2017) studied this question.
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