Introduction to Protection System Relays and Their Functions
Learn about the different types of relays used in protection systems and their functions including input, operating principle, and performance characteristics. Explore how relays help in initiating tripping and closing operations in electrical systems.
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Presentation Transcript
Elective Course Introduction to Protection System Elective Course 1 1 Introduction to Protection System
Relays Relays Relays are the logic elements, which initiate the tripping and closing operations. There are many types of relays according to its function, input, Operating principle or structure, and Performance Characteristic.
Relays Relays Function Input Operating principle Performance or structure Characteristic
Relay Relay - - Inputs Inputs Current Power Frequency Flow Information Voltage Pressure Temperature Vibration
Relay Relay - - Inputs Inputs The above classifications are based on the ANSI standard C 37.90.
Relay Relay - - Operating Operating principle or structure structure principle or Current balance Product Sold state Static Thermal Percentage Multi-restraint Microprocessor Electromechanical
Relay Relay - - Operating principle or Operating principle or structure structure The above classifications are based on the ANSI standard C 37.90.
Relay Relay - - Performance Performance Characteristic Characteristic Distance Inverse time Under-voltage Ground or phase Phase comparison Segregated phase Directional-overcurrent Definite time Overvoltage High or low speed Directional-comparison
Relay Relay - - Performance Characteristic Performance Characteristic The above classifications are based on the ANSI standard C 37.90.
