研究目的
To investigate the initiation and propagation of streamers in canola seed based oil and mineral insulating oil under standard lightning impulse voltages, and to compare their streamer patterns, modes of propagation, and stopping lengths under both polarities of voltage in point-plane electrode gap.
研究成果
The study concluded that canola oil exhibits more branched negative polarity streamers and longer stopping lengths compared to mineral oil, leading to lower impulse breakdown strength. However, its higher AC breakdown strength and other beneficial properties suggest it has potential as a sustainable alternative to mineral oil in transformers, with further refinement.
研究不足
The study was limited to the observation of streamer initiation and propagation under standard lightning impulse voltages in a point-plane electrode gap. The findings may not be directly applicable to other electrode configurations or voltage types.
1：Experimental Design and Method Selection:
The study involved a comparative analysis of streamer initiation and propagation in canola seed based oil and mineral insulating oil under standard lightning impulse voltages. A point-plane electrode system was used to observe the streamer patterns and modes of propagation.
2：Sample Selection and Data Sources:
Canola oil and mineral oil were selected for the study. Their properties were measured and compared.
3：List of Experimental Equipment and Materials:
A test cell with point-plane electrode system, Haefely 10-stage impulse generator, RC voltage divider, Digital Impulse Measuring System (DIMS), oscilloscope, and a shadowgraph system with a 15 Mega pixel CCD camera were used.
4：Experimental Procedures and Operational Workflow:
The experiment involved applying standard lightning impulse voltages to the oils in the test cell and capturing the streamer initiation and propagation events using the CCD camera. The voltage and current signals were recorded for analysis.
5：Data Analysis Methods:
The streamer patterns, modes of propagation, and stopping lengths were analyzed based on the captured images and recorded signals.
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