Cast resin dry-type transformers are widely used in commercial buildings, industrial plants, hospitals, data centers, infrastructure projects, and indoor substations because of their fire performance, low maintenance requirements, and suitability for installation close to electrical loads. However, one important specification that is sometimes treated as a secondary detail is the transformer enclosure IP rating.
Transformers are critical assets in power systems, and ensuring their safety and reliability is essential for uninterrupted power supply. Transformer protection and safety equipment vary based on the type, capacity, and operational environment of the transformer. Here is an overview of protection equipment for oil-filled transformers and cast resin dry transformers, and the rationale behind each.