Mechanisms of occurrence of partial discharges in oil shale
This work studies of the mechanisms of the occurrence of partial discharges in oil shale by the example of the oil shale found in the Huadian deposit (PRC). This oil shale contains about 30% of organic components. The composition and structure of the rock were investigated by means of electron microscopy and elemental analysis of the mineral component of the shales. Experiments on the initiation of partial discharges in the rock were described. It is noted that due to a very high heterogeneity of oil shale under stress, the Maxwell-Wagner effect occurs. This effect, structural features and a very wide range of electrophysical characteristics of the rock components have lead to strong distortions of the electric field in the rock. As a result, partial discharges occur at very low electric field strengths: 11.6 V/mm and 3.9 V/mm with an interelectrode distance of about 50 mm and 200 mm, respectively. The occurrence of partial discharges is mainly influenced by the applied voltage, and not by the average field strength as in most dielectric materials.
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Keywords
Maxwell-Wagner effect, electrophysical properties, partial discharges, oil shaleAuthors
| Name | Organization | |
| Martemyanov S.M. | National Research Tomsk Polytechnic University | martemyanov@tpu.ru |
| Bukharkin A.A. | National Research Tomsk Polytechnic University | ater@tpu.ru |
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