What are the advantages of signal relays and the role of relays?

Key Advantages of Signal Relays:

It has the advantages of fast action, stable work, long service life and small size. It is widely used in power protection, automation, motion, remote control, measurement and communication devices.

Relay is a commonly used device in automatic control system, which is used to turn on and off circuits to issue control commands and reflect the status of equipment to form automatic control and remote control circuits. Relays are used for automatic control in all fields. The relay widely used in railway signaling technology, called signal relay (in the signaling system, it can be referred to as relay), is an important component in railway signaling.

It plays an important role as the core component of the relay signal system and as the interface component of the electronic or computer signal system. The reliability of the operation of the relay directly affects the reliability and safety of the signal system.

Principle. It is generally composed of an iron core, coil, armature, contact reed, etc. As long as a certain voltage is added to both ends of the first circle, a certain current will flow through the coil, resulting in an electromagnetic effect, and the armature will overcome the tensile force of the return spring under the action of electromagnetic force attraction to attract the core, thereby driving the dynamic contact of the armature to engage with the static contact (normally open contact).

When the coil is de-energized, the electromagnetic suction force also disappears, and the armature will return to its original position under the reaction force of the spring, so that the moving contact and the original static contact (normally closed contact) are released. In this way, it is engaged and released, so as to achieve the purpose of conduction and cutting in the circuit. The "normally open, normally closed" contacts of the relay can be distinguished as follows:

The static contact that is in the open state when the relay coil is not energized is called the "normally open contact"; Static contacts that are turned on are called "normally closed contacts". Relays generally have two circuits, which are low-voltage control circuits and high-voltage working circuits.

Relays have the following functions in the signaling system.

1. Expand the control range: for example, when the control signal of the polycelery lead contact relay reaches a certain good value, it can be changed, interrupted and connected to multiple circuits at the same time according to the different forms of the contact group.

2. Amplification: For example, sensitive relays, intermediate relays, etc., can control very high-power circuits with a very small control quantity.

3. Comprehensive signal: for example, when a plurality of control signals are input into a multi-winding relay in the specified form, the predetermined control effect is achieved after comparative synthesis.

4. Self-fronting stool movement, remote control, monitoring: for example, the relay on the automatic device and other electrical appliances can form a program control circuit, so as to achieve automatic operation.

The function of the relay: 1. Expand the range of control contact groups; 2. Amplify the control volume; 3. Integrated relay signal; 4. Together with other electrical appliances, the relay can be composed of program control circuits to achieve automatic, remote control and monitoring. Relay is a kind of electrical control device, which is an electrical appliance that makes a predetermined step change of the controlled quantity in the electrical output circuit when the change of the input quantity reaches the specified requirements.

TF Tengfei Relay T73 Relay.

1.Relay is an electronic control device, it has a control system (also known as an input loop) and a controlled system (also known as an output loop), usually used in automatic control circuits, it is actually a kind of "automatic switch" to control a larger current with a smaller current. Therefore, it plays the role of automatic adjustment, safety protection, and conversion circuit in the circuit.

2.The input signal x of the relay is continuously increased from zero to the action value xx when the armature starts to engage, and the output signal of the relay immediately jumps from y=0 to y=ym, that is, the normally open contact is from off to on. Once the contact is closed, the input amount x continues to increase, and the output signal y will no longer change.

When the input amount x drops from a value greater than xx to xf, the relay begins to release and the normally open contact is disconnected.

The signal relay plays the role of a monitoring circuit, and when the circuit circuit fails, the signal relay will be activated. For protection circuits. It has an alarm effect, which is manifested as a light or sound.

The function of the signal relay is mainly to give you a signal by sending out lights, sounds, and a drop to tell you what just happened. For example, a certain line is overloaded, or a certain protection action of a certain device.

A relay is an electrical control device, which has an interactive relationship between the control system (also known as the input loop) and the controlled system (also known as the output loop). Usually used in the control circuit of automation, it is actually a kind of "automatic switch" that uses a small current to control the operation of a large current. Therefore, it plays the role of automatic adjustment, safety protection, and conversion circuit in the circuit.

Signal relays are generally used for monitoring and protection, and are widely used in the secondary protection circuit of distribution high-voltage cabinets. For example, the transformer oil exceeds 85 degrees, and there is a normally open contact closure on the temperature monitoring indicator, which is strung on the coil circuit of the signal relay, so there is a signal that causes the signal relay coil to be engaged, and the signal relay acts, and the high-voltage switch is disconnected at the same time, and the load of the transformer is removed, thus protecting the transformer, but the signal relay is also divided into many kinds, and some are directly buzzers or flashes as alarm signals.