Transformer winding deformation test is a test method widely used in power system to detect whether it is deformed in recent years. It can effectively find the axial and radial dimension change of transformer, body displacement, winding distortion, bulging and inter-turn short circuit. It is a necessary test to ensure the normal operation of the power system. Therefore, it is very necessary for power personnel to use the transformer winding deformation tester to perform transformer winding deformation test. After the transformer was short-circuited at the outlet of the low-voltage side, various insulation tests and chromatographic analysis of the transformer oil were performed well, but with the LC-IV transformer winding deformation tester manufactured by Shanghai Lanchao Electric Co., Ltd., when performing the winding deformation test, the internal winding After a serious deformation, the enclosure was inspected. After the enclosure was opened, it was found that the low-voltage side winding had become a mess and was processed in time to avoid a major accident in which the transformer was damaged.
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Because there is no provision for winding deformation test in the pre-test procedure, the average unit places insufficient emphasis on this test. We also found that some units have poor reliability due to distribution equipment (including lines). Some substations have experienced more than 100 rapid over-current protection tripping accidents during the year, and some accidents have occurred at the transformer outlet but have not caused Enough attention. It is generally believed that as long as the accident is successful after the accident, it will be safe. Based on the above experience, after a transformer short-circuit accident at the exit of the transformer or in the immediate area, failure to conduct the winding deformation test will likely leave a very serious hidden danger.
In order to make the power system run more safely, we recommend:
1. After the main transformer has an outlet or short-circuit accident in the immediate area, in addition to performing various insulation tests and chromatographic analysis, the winding deformation test should also be conducted in a timely manner;
2. It is recommended that the National Power Company's Institute of Electrical Engineering and other related departments supplement the items and requirements for transformer winding deformation test in the pre-test procedure;
3. It is understood that most of the current general power supply enterprises have not tested the equipment for winding deformation test, and can only request the assistance of an external unit, and the cost of each test is large. If the power supply bureau owns more transformers (for example, more than 50 sets), it is recommended to purchase a transformer winding deformation tester to test the failed transformers and save them as historical files for future comparison. This will strengthen equipment management. Preventing major equipment accidents will play an active role.
From the above information, we can know the necessity of transformer winding deformation test, and we can also know the importance of transformer winding deformation tester for this test.