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2. (b) RELAY - Coggle Diagram
2. (b) RELAY
Solid State Relay
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A solid-state relay is an ON-OFF control device in which the load current is conducted by one or more semiconductors (power transistor, an SCR or a TRIAC
The most common application of solid state relays is in the switching of an AC load, whether that is to the AC power for ON/OFF switching, light dimming, motor speed control or other such applications where power control is needed, these AC loads can be easily controlled with a low current DC voltage using a solid state relay providing long life and high switching speeds
Reed Relay
- The operation of the reed relay is quite straightforward. it works by placing a magnetic field close to the reed switch contacts. this causes each of the reeds to become magnetically oriented such that the two ends of the reed attract each other and move together closing the contact
- Under conditions where no magnetic field is applied, the two contacts will not be magnetically oriented and the soring loading in the contacts will keep them apart
Reed relays and reed switches are used in many areas where smaller, faster acting relays are needed in an electronic or electrical circuit. Many switching applications use the reed relay due to the small size and high speed
Time-delay Relay
Time relay is widely used in remote control, telecommunication, automatic control and other electronic equipment , and is one of the most important control components.
Time delay relays control the flow of electrical power and can be used to control power to many different types of electrical loads. Combining electromechanical output relay capability with control circuitry, these relays are pre-engineered to perform up tp 11 time delay functions
Thermal Relay
Thermal relays are protective electrical appliances used for overload protection of motors or other electrical equipment and electrical circuits.
Thermal relay is to use the thermal effect principle of current to cut off the motor circuit in case of overload that the motor can not bear, so as to provide overload protection for the motor
Distance Relay
The major principle of distance relay is it functions depending on the distance of fault in the transmission line. Its operation depends on the impedance between the point of fault and the point where the relay is installed
The impedance between the point of fault and the location of the relay is calculated based on the voltage and currents of the transmission line during the fault case. The impedance at that particular point becomes the operating quantity for the relay
Used for both phase fault and ground fault protection, and they provide higher speed for clearing the fault. Distance protection relay is widely spread employed for the protection of high-voltage AC transmission line and distribution lines
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