LIGHTNING IMPULSE VOLTAGE DISTRIBUTION OVER VOLTAGE TRANSFORMER WINDINGS — SIMULATION AND MEASUREMENT
Keywords:
Voltage transformers, parameters is developed.Abstract
Voltage transformers in a power system are designed to trans-form voltages from high voltage on a transmission level to low voltage necessary for relays and measurement equipment. During their operation, the voltage transformers windings are subjected to high frequency transient overvoltage due to switching operations and lightning strikes. Transient overvoltage can potentially lead to excessive electric stress in the transformer windings and insulation and consequently result in insulation failure and breakdown. In order to adequately dimension the transformer windings and inter turn or interlayer insulation, the transient voltage distribution needs to be obtained on a design level. Considering the typical winding geometry of a voltage transformer, which normally very large number of turns and discrete interlayer insulations, In order to model and simulate the transient voltage distribution, an equivalent electric circuit representation of distributed or lumped parameters is developed.
References
-BHEL book, Transformer Engineering Design and Test
-IS-2026 part-III Indian Standard POWER TRANSFORMERS PART 3 INSULATION LEVELS AND DIELECTRIC TESTS
-Transformer Engineering Design and Practice (Book) S.V.Kulkarni S.A.Khaparde Indian Institute of Technology, Bombay Mumbai, India
-The J & P Transformer Book Twelfth edition A PRACTICAL TECHNOLOGY OF THE POWER TRANSFORMER Martin J. Heathcote, CEng, FIEE
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