Video: Tutorial on Distance Protection
Distance Protection
Principle
The basic principle of distance protection involves the division of the voltage at the relaying point by the measured current. The apparent impedance so calculated is compared with the reach point impedance. If the measured impedance is less than the reach point impedance, it is assumed that a fault exists on the line between the relay and the reach point.
The combination of fast fault clearance with
selective tripping of plant is a key aim for the protection
of power systems. To meet these requirements, highspeed
protection systems for transmission and primary
distribution circuits that are suitable for use with the
automatic reclosure of circuit breakers are under
continuous development and are very widely applied.
Advantage
Distance protection, in its basic form, is a non-unit
system of protection offering considerable economic and
technical advantages. Unlike phase and neutral
overcurrent protection, the key advantage of distance
protection is that its fault coverage of the protected
circuit is virtually independent of source impedance
variations.
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Credit: General Electric |
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