ABB RELION REX640 Technical Manual page 921

Protection and control

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Table of Contents

1MRS759142 F

Analog channel configuration

FRPFRQ has one analog group input which must be properly configured.

Table 879: Analog inputs

There are a few special conditions which must be noted with the configuration.

Table 880: Special conditions

U3P connected to real measurements

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 FRPFRQ can be described using a module diagram. All the modules

in the diagram are explained in the next sections.

Figure 514: Functional module diagram

Technical Manual

See the preprocessing function blocks in this document for the possible

signal sources.

Three-phase voltages

The function requires that at least one phase

or phase-to-phase voltage channel is connec-

Operation setting. The

Protection functions