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.

Document conventions
A particular convention may not be used in this manual.
• Abbreviations and acronyms in this manual are spelled out in the glossary. The
glossary also contains definitions of important terms.
• Push-button navigation in the LHMI menu structure is presented by using the push-button icons.
To navigate between the options, use and .
• HMI menu paths are presented in bold.
Select Main menu/Settings.
• LHMI messages are shown in Courier font.
To save the changes in non-volatile memory, select Yes and press .
• Parameter names are shown in italics.
The function can be enabled and disabled with the Operation setting.
• Parameter values are indicated with quotation marks.
The corresponding parameter values are "On" and "Off".
• IED input/output messages and monitored data names are shown in Courier font.
When the function starts, the START output is set to TRUE.
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