REF611 is a dedicated feeder protection relay designed for the protection, control, measurement
and supervision of utility substations and industrial power systems.
The feeder protection relay REF611 can be supplied either with directional or non-directional
overcurrent and earth-fault protection.
Directional earth-fault protection is mainly used in isolated neutral or compensated networks,
whereas the non-directional earth fault protection is intended for directly or low-impedance earthed neutral networks.
REF611 is a member of ABB’s Relion® product family and part of its 611 protection and control series of relays.
For optimized control and reliable operation of your switchyard, the REC670 is your best choice for transmission applications.

REC670 IEDs (Intelligent Electronic Device) provide control solutions for any type of switchgear and different switchgear configurations.
The customized REC670 gives you the freedom to select the functionality entirely according to your needs.
The pre-configured REC670 variants simplify handling since the basic functionality is included and pre-configured.
If needed, you can add optional functions to easily increase the functionality of
the REC670 IEDs to meet the specific requirements of your switchyard.
REC670 integrates advanced voltage control for transformers in a substation in a single IED.
The IEDs feature a large HMI for local control and instant access to important data,
such as settings, events and disturbance information.
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