ABB RELION REX640 Technical Manual page 1086

Protection and control

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Table of Contents

Protection functions

Analog channel configuration

ARCSARC has two analog group inputs which must be properly configured.

Table 1027: Analog inputs

Improper analog channel configuration causes a validation error if the analog

channels are not completely configured or they do not match with certain settings.

For troubleshooting, check the contents of this chapter and also the preprocessing

blocks in this document. The configuration can be written to the protection relay

once the mismatch is corrected.

Operation principle

The function can be enabled and disabled with 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.

Figure 609: Functional module diagram

Level detector 1

The measured phase currents are compared phasewise to the set

If the measured value exceeds the set

the exceeding of the value to the operation mode selector.

Can be connected to GRPOFF if "Light only" or "BI controlled" operation modes are used

See the preprocessing function blocks in this document for the possible

signal sources. The GRPOFF signal is available in the function block called

Three-phase currents, necessary when the operation mode

"Light +current" is used

Residual current (measured or calculated)

Phase start value , the level detector reports

1MRS759142 F

Operation setting. The

Fixed delay 1

Fixed delay 2

Phase start value .

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