ABB RELION REX640 Technical Manual page 453

Protection and control

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1MRS759142 F

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

Table 529: Special conditions

U3P connected real measurements

URES calculated

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 DEFxPDEF can be described using a module diagram. All the

modules in the diagram are explained in the next sections.

Can be connected to GRPOFF if

"Nondirectional".

Technical Manual

See the preprocessing function blocks in this document for the possible

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

Pol quantity is set to "Neg. seq. volt" or Directional mode is set to

Protection functions

Three-phase voltages, necessary when

quantity is set to "Neg. seq. volt."

Residual voltage (measured or calculated),

Pol quantity is set to "Zero

necessary when

The function can work with any two phase

voltage channels connected but it is recom-

mended to connect all three voltage chan-

VT connection must be "Wye" in that

particular UTVTR.

Operation setting. The