What is the guide for loading oil immersed distribution and power transformers according to C57.91?

The guide for loading oil immersed distribution and power transformers according to C57.91 provides methodologies for determining the maximum allowable loading of transformers based on ambient temperature, cooling methods, and thermal characteristics. It emphasizes the importance of monitoring transformer oil temperature to prevent overheating and ensure reliability. The guide also includes factors such as load cycles and seasonal variations to optimize transformer performance while maintaining safety and efficiency.