Transformers are also called instrument transformers, which are a collective name for current transformers and voltage transformers. It can change high voltage to low voltage and large current to small current for measuring or protecting the system. Its function is mainly to convert high voltage or large current into standard low voltage (100V) or standard low current (5A or 1A, both refer to the rated value) in order to achieve the standardization and small size of measuring instruments, protection equipment and automatic control equipment. Into. At the same time, the transformer can also be used to separate high-voltage systems to ensure the safety of people and equipment.