Signal relays are used more in secondary maintenance circuit circuits. It tells the right people exactly what is wrong with the maintenance. The power relay is a bit like a discriminant sentence in mathematics. When a constant is entered, the satisfactory and unsatisfactory conditions will output different results. A power relay is also a type of power relay that is capable of making a jump in one or more electrical output circuits when the input quantity satisfies certain rule conditions.
The principle of signal relay is to receive the impulse current emitted by the impulse relay and act, so that the light plate or buzzer or electric bell rings. Signal relays are generally used for monitoring and maintenance, and are used more in the secondary maintenance circuit of distribution high-voltage cabinets.
For example, you will understand that the temperature of the transformer oil exceeds 85 degrees, and there is a normally open contact closure on the temperature monitoring indicator, and this contact string is on the coil circuit of the signal relay, so if there is a signal, the signal relay coil will be engaged, and the signal relay action "light" word will be dropped, and the high-voltage switch will be disconnected at the same time, and the load of the transformer will be unloaded, so as to maintain the transformer.
The above distinguishes between signal relays and power relays from the functional principle, and the contact current of signal relays and power relays is also different, and the key is to consider the contact current.
Signal relays
Relay is a commonly used equipment in automatic control system, which is used to turn on and off circuits to issue control commands and reflect the status of equipment, so as to constitute automatic control and long-distance control circuits. Relays are used for automatic control in all fields. The widely used relay 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.
Power relays
A power relay is a device that can make a jump in one or more electrical output circuits when the input quantity (or excitation quantity) satisfies the conditions of certain rules. It can be used in neutral direct grounding systems as a directional element for zero sequence current maintenance.
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