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| Improvement of low temperature performance of vegetable insulating oil |
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| DOI： |
| KeyWord:vegetable insulating oil low temperature performance pour point crystallizing fractionation process pour point depressant |
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| Abstract: |
| In order to improve the low temperature operation reliability of vegetable insulating oil-immersed transformer, the low temperature performance improvement experiment of vegetable insulating oil was studied by combining crystallizing fractionation and adding pour point depressant. The results showed that crystallizing fractionation process could effectively improve the low temperature performance of vegetable insulating oil, and did not affect the original performance. When the stirring speed reached 5 r/min during the low temperature crystallization, the pour point of vegetable insulating oil could be reduced to -19.5 ℃. Acrylate polymer had no depression effect, and could affect the electrical performance of vegetable insulating oil. The depression effect of polymethacrylate was better than that of poly-α-olefin, and when the addition ratio of polymethacrylate was 1%, the pour point of vegetable insulating oil treated by crystallization fractionation could be reduced to -26.3 ℃, and the good physicochemical and electrical properties were maintained, which further expanded the application conditions and scope of the vegetable insulating oil-immersed transformer. |
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