ABB RELION REX640 Technical Manual page 991

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1MRS759142 C

Technical Manual

GUID-37CDAB96-E090-4843-812A-3D91EA30088C V2 EN

Functional module diagram

Level detector 1

The measured phase currents are compared phasewise to the set Phase start value. If

the measured value exceeds the set Phase start value, the level detector reports the

exceeding of the value to Operation mode selector.

Level detector 2

The measured residual currents are compared to the set Ground start value. If the

measured value exceeds the set Ground start value, the level detector reports the

exceeding of the value to Operation mode selector.

ARC light detection

ARC detection information is received directly from the relay hardware input. The

detected ARC fault is directly signalled to the Operation mode selector and Fixed

delay 2 modules. There are four ARC detection inputs in the protection relay. Each

input is connected to a dedicated ARCSARC function.

ARC detection inputs connected to ARCSARC

Operation mode selector

Depending on the Operation mode setting, Operation mode selector makes sure that

all required criteria are fulfilled for a reliable decision of an arc fault situation. The

operation is based on both current and light information in "Light+current" mode, on

light information only in "Light only" mode or on remotely controlled information in

"BI controlled" mode. When the "BI controlled" mode is in use and the OPR_MODE

ARC protection function

Protection functions

Fixed delay 1

Fixed delay 2

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