What are smart electronic devices and smart transformers?

What is an intelligent electronic device?
A: An intelligent electronic device is a device with a processor that has all or some of the following functions:
(1) Collect or process data.
(2) Receive or send data.
(3) Receive or send control commands.
(4) Execute the control command.
For example, transformers with intelligent features, controllers of on-load tap-changers, on-site partial discharge monitors with self-diagnosis functions, etc.
What is a smart transformer?
Answer: A smart transformer includes the transformer body, sensors and controllers built-in or external to the transformer body, and intelligent components that realize the measurement, control, metering, monitoring and protection of the transformer.