What is electrical primary equipment and circuits?
Electrical primary equipment is a high-voltage electrical equipment that directly produces, transmits, and distributes electrical energy. It includes generators, transformers, circuit breakers, disconnectors, automatic switches, contactors, knife switches, busbars, transmission lines, power cables, reactors, motors and so on. By the interconnection of electrical primary equipment, it constitutes the electrical circuits of power generation, transmission, distribution or other production, which is known as a primary circuits or a primary wiring system.
What is electrical secondary equipment and circuits?
Secondary equipment refers to the low voltage equipment providing monitoring, controlling, regulating, and protecting for primary equipment, as well as providing working conditions or production command signals for operations and maintenance. Such as fuses, control switches, relays, control cables, and so on. By the interconnection of electrical secondary equipment, it constitutes the electrical circuits of monitoring, controlling, regulating and protecting, which is known as a secondary circuits or a secondary wiring system.