Large-scale wind parks utilize different types of transformers in one installation. A typical wind farm electrical installation includes several small transformers, such as generation transformers, connecting single wind turbines to a main bus feeder. Several feeders then connect the substation to the power grid using one or more larger power transformers.
Problems can develop in the insulation system of these transformers due to a wide variety of factors. Consequently, periodic diagnostic condition assessment is requested more frequently by wind park operators, as failures cause increasing outage costs for repairs and, in the worst case, undelivered energy.