New Experimental System for the Study of the Effect of Temperature and Liquid to Solid Transition on Streamers in Dielectric Liquids: Application to Cyclohexane

作者：Hestad O L^*; Lundgaard L E; Linhjell D

来源：IEEE Transactions on Dielectrics and Electrical Insulation, 2010, 17(3): 764-774.

• Test equipment
• charge injection
• charge measurement
• temperature control
• dielectric materials
• cyclohexane

An experimental setup for dielectric testing of insulating liquids in the temperature range from -60 degrees C to +250 degrees C has been built. The system uses point-plane geometry, a sensitive differential charge measurement technique, a computer controlled temperature regulator, a photomultiplier and a pulse generator with a fast rise time. This paper presents a detailed overview of the functionality of the system and results obtained in cyclohexane under positive and negative polarity below and above freezing point. Pre-inception current, inception probabilities, streamer charge and emitted light from streamers are reported. The results found in cyclohexane at room temperature compares well to results obtained in other similar setups. A temperature dependence on the injected streamer charge for liquid cyclohexane under positive polarity was observed. No polarity differences were observed for any of the measured quantities in frozen cyclohexane.

• 出版日期2010-6