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| Experimental Study of Cellulose Particles Effect on Impulse Breakdown in Transformer Oil |
| Zhao Tao1, Lü Fangcheng1,2, Liu Yunpeng1,2, Cheng Xiangrui1, Wang Fochi1 |
1.Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense North China Electric Power UniversityBaoding071003 China;
2. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing102206 China |
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Abstract This paper conducts an experimental research about the effect of cellulose particles on impulse breakdown in transformer oil. The hemispherical electrodes immersed in the bulk of the transformer oil are used to form a quasi-uniform electric field. The breakdown tests are carried out and the breakdown voltages for three cellulose contamination levels oil under four kinds of impulse, 1.4/50 μs,14/220 μs,80/850 μs and 250/2600 μs, are obtained. The results show that both the impulse waveshape and cellulose contamination level exert an effect on the breakdown voltage of transformer oil. Specifically, longer impulse durationor higher cellulose contamination levels of transformer oil lead to the decrease of impulse breakdown voltage. It is noted that the effect of the high level cellulose contamination for U50% becomes much more significant under the impulses of 80/850 μs and 240/2400 μs. Another relevantexperiment is finally conducted under the impulses of 1.4/50 μsand 240/2400 μs on cellulose particlesmotion in transformer oil gap submitted to a divergent electric field, and the suspension and aggregation of cellulose particles are observed under the impulses of 240/2400 μs. It is concluded that the particle can play a catalytic role in the impulse breakdown of the oil gap.
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Received: 23 January 2017
Published: 12 April 2018
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2018, Vol. 33 
