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Center for Simulating Partial Discharge in Oil
Background
Currently, for insulating laminated materials, electrical performance testing mainly relies on the electric field strength of parallel adhesive layers as an important technical indicator. However, with the development of transformer technology, the current issue troubling transformer manufacturers is that partial discharge tests are required during transformer acceptance. Over 80% of test failures are due to partial discharge exceeding limits. For critical insulating materials within transformers, there are no partial discharge test items, relying solely on transformer tests, which clearly indicates a post-inspection situation. The losses caused by partial discharge exceeding limits are significant. If the partial discharge performance of insulating materials can be monitored, it can greatly improve the first-time pass rate of transformer manufacturing.
Research Orientation
Supported by renowned transformer manufacturers such as Siemens, Hitachi, and GE, and incorporating advice from top domestic testing experts, a testing center was established in 2018 at a cost of 5 million RMB. This is the first center in China capable of independently conducting tests on the inception voltage of partial discharges in insulating oil. The establishment of this center provides beneficial test data support for research and development aimed at improving the performance of insulating materials. Additionally, it can monitor the impact of common defects in insulating materials on their electrical properties.
With the support of this equipment, the optimization process for the bonding agents and pressing techniques of laminated insulation materials has been accelerated. After long-term refinement, the polyester resin laminated materials developed by our company have now been successfully applied in ultra-high (extra-high) voltage transformer projects both domestically and internationally.
