Detailed Explanation of high-voltage Transformer Bushing
The high-voltage transformer bushing is a key insulating and connecting component in the high-voltage transformer, and is responsible for the electrical connection between the high-voltage coil and the external power grid. It not only ensures the reliable transmission of the current inside the transformer, but also plays an important role in insulation protection, preventing the occurrence of fault phenomena such as arcing and breakdown, and ensuring the safe and stable operation of the transformer.
1. The role of high-voltage transformer bushing Electrical connection function The high-voltage bushing is responsible for leading the high-voltage winding inside the transformer to the external high-voltage line, and is the electrical path between the transformer and the external power grid. Insulation protection function Due to the extremely high potential of the high-voltage winding of the transformer, the bushing must have good insulation properties to isolate the high-voltage part from the transformer oil and ground wire to prevent short circuits and breakdowns caused by contact with the external environment or the casing. Mechanical support function The bushing also plays the role of mechanical support, bearing the tension of the wire and external mechanical impact, and ensuring the stability and durability of the connection part.
2. Types of high-voltage transformer bushings Common high-voltage bushings are mainly divided into the following types: Oil-impregnated paper insulation bushing Oil-impregnated paper is used as the insulating medium and immersed in transformer oil. This type of bushing has good insulation performance and is suitable for transformers with higher rated voltages. Epoxy resin bushing The use of epoxy resin as an insulating material has the advantages of compact structure, light weight, and good moisture resistance, and has gradually become the mainstream in recent years. Composite insulator bushing Made of a combination of multiple insulating materials, it takes into account both mechanical strength and electrical performance, and is suitable for transformers with special working conditions and higher voltage levels.
3. Main technical requirements for high-voltage bushings Excellent insulation performance The insulation level of the maximum working voltage and impulse voltage that will be generated must be met to prevent discharge and breakdown. High mechanical strength The bushing must be able to withstand various mechanical stresses that may be generated during transportation, installation and operation. Aging resistance and corrosion resistance For long-term use in transformer oil environment and external climate, the bushing material must have good heat resistance and chemical corrosion resistance to ensure service life. Good sealing performance The connection between the bushing and the transformer tank must be sealed reliably to prevent oil leakage and maintain the integrity of the insulating oil inside the transformer. IV. Maintenance and repair of high-voltage bushings Regular inspection Ensure that there is no abnormal temperature rise and discharge in the bushing by means of infrared temperature measurement, partial discharge detection, etc. Cleaning and maintenance Keep the appearance of the bushing clean to prevent dust and moisture accumulation from causing surface leakage current. Timely replacement of aging parts If the insulation performance of the bushing is found to be degraded or mechanically damaged, it should be replaced in time to prevent accidents.
V. Conclusion As an important part of the transformer system, the high-voltage transformer bushing is directly related to the operation safety and reliability of the transformer. With the continuous improvement of the voltage level of the power system, the design and manufacturing technology of high-performance and high-reliability bushings is particularly important. In the future, the improvement of material technology and the application of intelligent monitoring technology will further promote the development of bushing technology and provide solid guarantee for the stable operation of the power system.
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