The electrical equipment of power plant and substation is divided into one equipment and two times equipment. Once equipment (also known as the main equipment) is the main body of the power system, it is the direct production, transmission and distribution of electrical energy equipment, including generators, power transformers, circuit breakers, isolation switches, power bus, power cables and transmission lines. Secondary equipment is a device for control, regulation, protection and monitoring of equipment, which includes control equipment, relay protection and automatic devices, measuring instruments, signal devices and so on. The secondary equipment obtains the electrical connection with the first equipment through the voltage transformer and the current transformer. A circuit of a device and its connection is called a primary circuit. The electrical circuit in which the secondary equipment is connected in accordance with certain rules to achieve certain technical requirements is called the two-time circuit.
The contents of the two circuit include control, adjustment, relay protection and automatic device, measurement and signal circuit and Operation Power system of the primary equipment of power plant and substation. One district, two districts and three districts
One area is the most important part, the direct contact device of what switch quantity, also has the important control signal, changes the setting value such. Zone
Three, is the dispatch of some of the less than a few of the information systems in the area, they are such things: the signal, control the amount of the importance of the difference into different areas to prevent human error. At the same time, the update speed of important area is different.
