电气成套继电器目前在国内来讲种类繁多，有控制继电器与保护继电器，用于保护装置称保护继电器；用于控制称控制继电器。继电器根据功能的不同分为度量继电器和有或无继电器：

At present, there are many kinds of electrical complete sets of relays in China, including control relays and protection relays, which are called protection relays for protection devices; Used to control the scale control relay. Relays are divided into metric relays and with or without relays according to their functions:

1.度量继电器指能度量（或压力等）大小，并与预定值相比后而动作的继电器。

1. Measurement relay refers to the relay that can measure (or pressure, etc.) and act after comparing with the predetermined value.

电压继电器：当电路中电压超过或低于整定值而动作的继电器；

Voltage relay: a relay that acts when the voltage in the circuit exceeds or is lower than the setting value;

功率方向继电器：当电流流向某一方向的功率超过整定值而动作的继电器；

Power direction relay: a relay that acts when the power in one direction of current flow exceeds the set value;

阻抗继电器：反应故障点至保护装置安装地点距离阻抗，并根据距离远近（阻抗大小）而确定动作时间的继电器；

Impedance relay: a relay that reflects the distance impedance from the fault point to the installation site of the protection device, and determines the action time according to the distance (impedance);

差动继电器：电路中不同地点的电流差值超过整定值而动作的继电器。

Differential relay: relay that acts when the current difference at different locations in the circuit exceeds the setting value.

2.有或无继电器：有或无继电器是接受度量继电器动作之后发出命令而动作，作用于开关跳闸延时、信号等功能的继电器，或者说它是一种接通电源（有电）就动作的继电器，不具备度量电路参数功能。

2. With or without relay: With or without relay is a relay that acts on the switch tripping delay, signal and other functions after receiving the command from the measurement relay, or it is a relay that acts when the power is turned on (powered on), and does not have the measurement circuit parameter function.

如时间继电器：除信号以外，其触点经过一定延时而闭合或断开的继电器；中间继电器：用来增加信号数量或将信号放大的继电器；信号继电器：用来发出信号或作用于信号系统显示的继电器。

For example, time relay: relay whose contact is closed or opened after a certain time delay, except for signal; Intermediate relay: relay used to increase the number of signals or amplify signals; Signal relay: relay used to send signals or act on signal system display.

在控制辅助回路中，保护回路除继电器外，少不了控制开关，其作用主要用来接通、切断主开关，如控制按钮、开关等，除以上控制保护元件，还有电工仪表、指示仪表、记录仪表、积算仪表，对发电机来说还需要装有频率表。您有需求就来我们网站 //www.aqfitlab.com咨询！

In the control auxiliary circuit, besides the relay, the protection circuit cannot be without the control switch, which is mainly used to connect and disconnect the main switch, such as the control button and switch. In addition to the above control and protection elements, there are also electrical instruments, indicating instruments, recording instruments, and totalizing instruments. For the generator, a frequency meter is also required. Come to our website if you need //www.aqfitlab.com consulting service