ABB RELION REX640 Technical Manual page 1056

Protection and control

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Table of Contents

Protection functions

Table 989: Analog inputs

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

Table 990: 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 DUPPDPR can be described using a module diagram. All the

modules in the diagram are explained in the next sections.

Figure 590: Functional module diagram

See the preprocessing function blocks in this document for the possible

signal sources.

Three-phase currents

Three-phase voltages

The function can work with the correspond-

ing one voltage channel connected if the

measurement mode is set to "PhsAB",

"PhsBC", "PhsCA", "PhsA", "PhsB" or "PhsC".

The function requires that at least two (the

third voltage will be derived) or all three volt-

age channels are connected for the other

measurement modes.

Operation setting. The

Technical Manual

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