ABB Transformer protection RET670 Pre-configure Application
Application
Versatile phase, earth, positive and zero sequence overcurrent functions, which can
optionally be made directional and/or voltage controlled, provide further alternative backup
protection. Thermal overload with two time constants, volts per hertz, over/under voltage and
over/under frequency protection functions are also available.
A built-in disturbance and event recorder provides valuable data to the user about status and
operation for post-fault disturbance analysis. Breaker failure protection for each transformer
breaker allows high speed back-up tripping of surrounding breakers.
The transformer IED can also be provided with a full control and interlocking functionality including
Synchrocheck function to allow integration of the main and/or a local back-up control.
Out of Step function is available to separate power system sections close to electrical centre
at occurring out of step.
The advanced logic capability, where user logic is prepared with a graphical tool, allows special
applications such as automatic opening of disconnectors in multi-breaker arrangements,
closing of breaker rings, load transfer logic and soon. The graphical configuration tool ensures
simple and fast testing and commissioning.
Serial data communication is via optical connections to ensure immunity against disturbances.