Time Relay
The time relay is a relay protection device, which mainly realizes the delay control circuit by using electromagnetic principle or mechanical principle. It can also be said that the time relay is an electrical component used in a circuit that uses a lower voltage or a smaller current to turn on or off a circuit of a higher voltage and a larger current.
Working principle of time relay When the coil is energized, the armature and the pallet are attracted by the iron core and move down instantaneously, so that the instantaneous action contact is turned on or off. However, the piston rod and the lever cannot fall together with the armature because the upper end of the piston rod is connected to the rubber film in the air chamber. When the piston rod starts to move downward under the action of the release spring, the rubber film is then concave downward. The air in the air chamber becomes thin and the piston rod is dampened and slowly descends. After a certain period of time, the piston rod is lowered to a certain position, and the delay contact is actuated by the lever, so that the breaking contact is opened and the moving contact is closed. From the energization of the coil to the completion of the delay contact, this time is the delay time of the relay. The length of the delay time can be changed by adjusting the size of the air inlet of the air chamber with a screw. After the attracting coil is de-energized, the relay is restored by the action of the return spring. Air is quickly expelled through the vent.
Type of time relay electromagnetic time relay . The electromagnetic relay is an electronic control device that plays an automatic adjustment, safety protection, and conversion circuit in the circuit. It is generally composed of a core, a coil, an armature, a contact spring, and the like. Electromagnetic relays have protruding fixed structure, protruding plug-and-pull structure, embedded plug-in structure, and are the popular products of time relay used in relay protection in the last century, but they are now eliminated products. .
Static time relay . The static time relay is used in the relay protection and automatic control loop of the secondary loop of the power system. As a delay device, the controlled component gets the required delay. The relay is an integrated circuit static type relay with high precision, low power consumption, accurate operation time, intuitive and convenient setting, wide range, and can completely replace the electromagnetic type time relay, and is suitable for use in a large-sized switchgear.
The time relay is classified as a power-on delay time relay . The power-on delay relay means that the relay does not immediately change the contact condition after power-on, but refers to the action after a certain delay (the normally closed contact becomes open and the normally open contact closes). It is controlled by the charging time of the capacitor on the circuit after power-on, or by using the "second oscillating signal" counting (ie, timing) to control the thyristor or transistor to be turned on or off to control the continuity of the line or to push the ordinary The relay works, and the control circuit is turned on and off to achieve the delay function.
Power failure delay time relay . The power-off time relay starts the delay action after the working voltage of the time relay is disconnected. To be exact, the time relay starts to delay after the user turns off the time relay power.
Common models of time relays
DS-21 DS-21C DS-31 DS-31C DS-31/2 DS-31C/2
DS-22 DS-22C DS-32 DS-32C DS-32/2 DS-32C/2
DS-23 DS-23C DS-33 DS-33C DS-33/2 DS-33C/2
DS-24 DS-24C DS-34 DS-34C DS-34/2 DS-34C/2
DS-25 DS-25C DS-35 DS-35C DS-35/2 DS-35C/2
DS-26 DS-26C DS-36 DS-36C DS-36/2 DS-36C/2
DS-27 DS-27C DS-37 DS-37C DS-37/2 DS-37C/2
DS-28 DS-28C DS-38 DS-38C DS-38/2 DS-38C/2
JS-11A/11, JS-11A/21, JS-11A/12, JS-11A/22,
JS-11A/13, JS-11A/31, JS-11A/32, JSS-11A,
JSS-12A, JSS-24SS-94B/1-1, SS-94B/1-2,
SS-94B/2-1, SS-94B/2-2, SS-94/1, SS-94/2,
SS-94/3, SS-94/4, SSJ-11A, SSJ-11B, SSJ-21A,
SSJ-31A, SSJ8-11A, SSJ8-11B, SSJ8-21A,
SSJ8-21B, SSJ8-31A, SSJ8-31B
RS-11A/RS-12A/RS-13A/RS-11B/RS-12B/RS-13B
RS-21A/RS-22A/RS-23A/RS-21B/RS-22B/RS-23B
RS-31A/RS-32A/RS-33A/RS-31B/RS-32B/RS-33B
Time relay symbol
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