GB/T 20840.4-2015 in English

This standard provides additional technical requirements for composite transformers, which are a type of instrument transformer. It outlines specific conditions and performance criteria that must be met to ensure the reliability and accuracy of these devices in various applications. The document covers aspects such as design, testing, and operational parameters, aiming to establish a consistent framework for the manufacture and use of composite transformers. It also includes provisions related to safety, environmental adaptability, and compatibility with other electrical equipment. The standard is structured to complement existing norms and enhance the overall quality and performance of composite transformers in power systems.