What parts does the hardware of microcomputer protection device mainly include? What is the function of each part?

Primary equipment is the equipment that directly generates, transmits and distributes electric energy, including synchronous generators, power transformers, power buses, high-voltage transmission lines and high-voltage circuit breakers. Primary equipment and the connecting circuit between them are called primary wiring or main wiring. The equipment that controls, protects, adjusts and measures primary equipment is called secondary equipment, including control and signal devices, relay protection and safety automatic devices, electrical measuring instruments and operating power supplies. The secondary equipment and the connecting circuit between them are called secondary wiring or secondary loop.