ABB RELION REX640 Technical Manual page 1275

Protection and control

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1MRS759142 F

Table 1204: Analog inputs

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

Table 1205: Special conditions

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 RCRWPSCH can be described with a module diagram. All the

modules in the diagram are explained in the next sections.

Figure 722: Functional module diagram

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

Wei mode is set to "Off" or "Echo".

Residual voltage (measured or calculated), necessary when

Wei mode is set to "Echo and Operate"

The function requires that all three voltage channels are con-

nected to calculate the residual voltage. Setting

tion must be "Wye" in that particular UTVTR.

Protection related functions

Operation setting. The