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The degree of partial discharge in transformer is an important basis to reflect the ageing degree of transformer insulating oil and evaluate the service life of transformer oil. In this paper, six kinds of transformer insulating oil with different water content were conducted partial discharge tests by two different test methods and four electrode arrangements. The influence of different test methods and electrode arrangements on the partial discharge initial voltage was analyzed. The results show that the partial discharge initial voltage is not only related to the physical and chemical properties of liquid dielectric, but also affected by the electrode arrangement, water content, and test methods. The test methods affect the dispersion of test results. The water content would change the physical and chemical properties of liquid dielectric, thereby it affects the partial discharge initial voltage from the aspects of macro dielectric property and micro ionization process. With the increase of water content, the electrode arrangement and test methods have less influence on the partial discharge initial voltage. The main factors affecting the partial discharge initial voltage of insulating oil with different water contents change from electrode arrangement and test method to the physical and chemical properties of insulating oil.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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