ABB Transformer protection RET670 Pre-configure Application 2

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 so

on. The graphical configuration tool ensures

simple and fast testing and commissioning.

Serial data communication is via optical

connections to ensure immunity against disturbances.