Ferroresonance Guidelines for Modern Transformer Applications

Based on extensive field tests, this research had the following objectives:

  1. Characterize ferroresonant behavior when grounded-wye padmount transformers are switched.
  2. Develop formulas for estimating ferroresonant overvoltage magnitude as a function of transformer and cable parameters.
  3. Provide detailed guidelines specifying the maximum cable length which can be switched with a given transformer without exceeding a critical overvoltage magnitude.

Tagged: P4-2, P2, Equipment Testing/Evaluation, System Protection, Engineering Guidelines