Experience with part-winding resonance in EHV auto-transformers: Diagnosis and corrective measures
- 1 July 1975
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Power Apparatus and Systems
- Vol. 94 (4) , 1294-1300
- https://doi.org/10.1109/T-PAS.1975.31967
Abstract
Four failures of large EHV auto-transformers on the AEP system are described. The failures were initiated by flashovers in the no-load tap changer during system faults. Investigations and tests attribute the flashovers to part-winding resonance. Test data is presented for various terminal conditions and wave shapes corresponding to system transient conditions. The relationship of these tests to ANSI standard dielectric tests is discussed. Corrective measures for existing transformers include arresters tied to an internal crossover connection and capacitor banks connected to the delta tertiary windings.Keywords
This publication has 1 reference indexed in Scilit:
- Field Measurement or Switching Surges as Modified by Unloaded 345-Kv TransformersIEEE Transactions on Power Apparatus and Systems, 1963