Line distance (21) protection is primarily used to protect transmission lines or other electrical equipment where the equipment’s impedance characteristic can be calculated or modeled with software applications. The protective relay calculates the ratio of measured voltage and current and uses Ohm’s Law to continually monitor the measured impedance while energized. The measured impedance
It would appear that everyone is either having no issues with ABB relays or ignoring them in hopes that they will go away. That said, is anyone using a Doble 6150 w/Protest and have good results? nukesdg
This has been bothering myself and some of my employees for a while. GE Quads are extended on the reach axis by the k factor of the relay, settings engineers that we have been working for are basically matching the reach settings of other manufacturers or the calculated reach settings
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