電氣成套繼電器目前在國內來講種類繁多，有控制繼電器與保護繼電器，用于保護裝置稱保護繼電器；用于控制稱控制繼電器。繼電器根據功能的不同分為度量繼電器和有或無繼電器：
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.度量繼電器指能度量（或壓力等）大小，并與預定值相比后而動作的繼電器。
1. Measurement relay refers to the relay that can measure (or pressure, etc.) and act after comparing with the predetermined value.
電壓繼電器：當電路中電壓超過或低于整定值而動作的繼電器；
Voltage relay: a relay that acts when the voltage in the circuit exceeds or is lower than the setting value;
功率方向繼電器：當電流流向某一方向的功率超過整定值而動作的繼電器；
Power direction relay: a relay that acts when the power in one direction of current flow exceeds the set value;
阻抗繼電器：反應故障點保護裝置安裝地點距離阻抗，并根據距離遠近（阻抗大小）而確定動作時間的繼電器；
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);
差動繼電器：電路中不同地點的電流差值超過整定值而動作的繼電器。
Differential relay: relay that acts when the current difference at different locations in the circuit exceeds the setting value.
2.有或無繼電器：有或無繼電器是接受度量繼電器動作之后發出命令而動作，作用于開關跳閘延時、信號等功能的繼電器，或者說它是一種接通電源（有電）就動作的繼電器，不具備度量電路參數功能。
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.
如時間繼電器：除信號以外，其觸點經過一定延時而閉合或斷開的繼電器；中間繼電器：用來增加信號數量或將信號放大的繼電器；信號繼電器：用來發出信號或作用于信號系統顯示的繼電器。
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.
在控制輔助回路中，保護回路除繼電器外，少不了控制開關，其作用主要用來接通、切斷主開關，如控制按鈕、開關等，除以上控制保護元件，還有電工儀表、指示儀表、記錄儀表、積算儀表，對發電機來說還需要裝有頻率表。您有需求就來我們網站
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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 http://www.serie-d.com consulting service
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