ABB RELION 620 Series Technical Manual page 755

Hide thumbs Also See for RELION 620 Series:

Table of Contents

1MRS757644 F

Technical Manual

The function detects light from an arc either locally or via a remote light signal. The

function also monitors phase and residual currents to be able to make accurate

decisions on ongoing arcing situations.

The function contains a blocking functionality. Blocking deactivates all outputs and

resets timers.

Operation principle

The function can be enabled and disabled with the Operation setting. The

corresponding parameter values are "On" and "Off".

The operation of ARCSARC can be described by using a module diagram. All the

modules in the diagram are explained in the next sections.

A070746 V4 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 the 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 the operation mode selector.

Operation mode selector

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

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

user can select either "Light+current", "Light only" or "BI controlled" operation

mode. 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

Protection functions

Show Quick Links

Table of Contents