电气一次设备，二次设备含义
Meaning of electrical primary equipment and secondary equipment
由一次设备相互连接，构成发电、输电、配电、或进行其他生产过程的电气回路称为一次回路或一次接线系统。一次设备是指用于生产、输送和分配电能的生产过程的高压电气设备。主要包括以下几个方面：
The primary circuit or primary wiring system is the electrical circuit connected by primary equipment to form power generation, transmission, distribution, or other production processes. Primary equipment refers to the high-voltage electrical equipment used in the production process of production, transmission and distribution of electric energy. It mainly includes the following aspects:
1> 生产和转换电能的设备。如变压器、电动机、发电机。
1> Equipment for producing and converting electrical energy. Such as transformer, motor, generator.
2> 接通和断开电路的开关设备。高压断路器、接触器、熔断器、负荷开关、隔离开关、磁力启动器等。
2> Switching devices for switching on and off circuits. High voltage circuit breaker, contactor, fuse, load switch, disconnector, magnetic starter, etc.
3> 限制短路电流或过电压的设备。如：电抗器、避雷器。
3> Equipment that limits short-circuit current or overvoltage. Such as: reactor, arrester.
4> 载流导体。如电缆。
4> Current carrying conductor. Such as cable.
5> 接地装置。如接地电阻、消弧线圈。
5> Grounding device. Such as grounding resistance, arc suppression coil.
二次设备是指对一次设备的工作进行监测、控制、调节、保护以及为运行、维护人员提供运行工况或生产指挥信号所需的低压电气设备。大部集中在主控室。
Secondary equipment refers to the low-voltage electrical equipment required for monitoring, controlling, regulating and protecting the work of primary equipment and providing operation conditions or production command signals for operation and maintenance personnel. Most of them are concentrated in the main control room.
1> 互感器。也可算一次设备，实际上起联接一次和二次设备的关键作用。
1> Transformer. In fact, it plays a key role in connecting primary and secondary equipment.
2> 测量表计。如电压表、电流表、功率表、电能表，用于测量电路中的电气参数。
2> Measuring meter. Such as voltmeter, ammeter, power meter, watt hour meter, used to measure the electrical parameters in the circuit.
3> 继电保护和自动装置。如继电器、自动装置等，用于监视一次系统的运行状况，迅速反应异常和事故，然后作用于断路器，进行保护控制。
3> Relay protection and automatic device. Such as relays, automatic devices, etc., used to monitor the operation of the primary system, quickly respond to anomalies and accidents, and then act on the circuit breaker for protection and control.
4> 操作电器。如各类型的操作开关、按钮等实现对电路的操作控制。
4> Operate electrical appliances. Such as various types of operating switches, buttons, etc. to achieve the operation control of the circuit.
5> 直流电源设备。如蓄电池组、直流发电机、硅整流装置等，供给控制、保护用的直流电源及厂用直流负荷和事故照明用电等。
5> DC power supply equipment. Such as storage battery, DC generator, silicon rectifier, DC power supply for control and protection, DC load for plant and power for emergency lighting, etc.