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建筑电气工程中的各种电气设备可分为一次设备和二次设备,其中一次设备是指各种控制设备(如隔离开关、负荷开关等)、变换设备(如变压器、电流互感器、电压互感器等)、保护设备(如熔断器、过电流继电器等)及母线等。连接一次设备的电路称为一次线路。二次设备是指对一次设备进行监视、测量、保护与控制的设备称为二次设备。将二次设备按照一定次序连接起来的线路图,称为二次接线图。 例如,某大容量电机供电线路中的电源母线、开关、电动机、导线等是一次设备。二次设备有监视母线是否送电的电源指示灯、对电源质量进行监
Various electrical equipments in building electrical engineering can be divided into primary equipments and secondary equipments, among which primary equipments refer to various control equipments (such as isolating switches, load switches, etc.) and transforming equipments (such as transformers, current transformers, voltage mutual inductance). Etc.), protective equipment (such as fuses, over-current relays, etc.) and busbars. The circuit that connects the primary device is called a primary circuit. Secondary equipment refers to equipment that monitors, measures, protects, and controls primary equipment and is called secondary equipment. The circuit diagram connecting the secondary devices in a certain order is called a secondary wiring diagram. For example, the power bus, switch, motor, and wire in a large-capacity motor supply line are primary devices. The secondary device has a power indicator that monitors whether the bus is transmitting power, and monitors the power quality.