part2-UNDERSTANDING MICRO-PROCESSOR-BASED TECHNOLO
2016-08-23
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Different technologies have been used in the past to implement protection functions that properly
detect disturbances in power systems and initiate the disconnection of the faulted components.
Originally, electromechanical relays were used to protect power systems. Most relays used
either electromagnetic attraction or electromagnetic induction principle for their operation.
Plunger type (electromagnetic) relays formed instantaneous units for detecting overcurrent or
over-voltage conditions. Balanced-beam relays provided differential protection, distance
protection as well as low burden (power requirement) overcurrent units. These relays operated
when the magnitude of an operating signal was larger than the magnitude of the restraining
signal. These relays were classified as amplitude comparators
detect disturbances in power systems and initiate the disconnection of the faulted components.
Originally, electromechanical relays were used to protect power systems. Most relays used
either electromagnetic attraction or electromagnetic induction principle for their operation.
Plunger type (electromagnetic) relays formed instantaneous units for detecting overcurrent or
over-voltage conditions. Balanced-beam relays provided differential protection, distance
protection as well as low burden (power requirement) overcurrent units. These relays operated
when the magnitude of an operating signal was larger than the magnitude of the restraining
signal. These relays were classified as amplitude comparators
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