ABB RELION REX640 Technical Manual page 1287

Protection and control

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1MRS759142 F

Table 1219: Analog inputs

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

Table 1220: Special conditions

U3P connected to real meas-

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 DNZSRDIR can be described with a module diagram. All the

modules in the diagram are explained in the next sections.

Can be connected to GRPOFF if

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 "Zero seq. volt.".

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

Three-phase currents, necessary when Pol quantity is "Neg.

Residual current (measured or calculated), necessary when

Pol quantity is "Zero seq. volt."

Three-phase voltages, necessary when Pol quantity is "Neg.

Residual voltage (measured or calculated), necessary when

Pol quantity is "Zero seq. volt."

The function can work with any two phase voltage channels

connected but it is recommended to connect all three volt-

age channels.

The function requires that all three voltage channels are con-

nected to calculate residual voltage. Setting

must be "Wye" in that particular UTVTR.

Protection related functions

VT connection

Operation setting. The