ABB RELION REX640 Technical Manual page 555

Protection and control

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1MRS759142 F

The operating time characteristic is according to the definite time (DT).

MFADPSDE contains a blocking functionality to block function outputs, timers or

the function itself.

Analog channel configuration

MFADPSDE has two analog group inputs which must be properly configured.

Table 613: Analog inputs

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

Table 614: 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

parameter values are "on" and "off".

The operation of MFADPSDE can be described using a module diagram. All the

modules in the diagram are explained in the following sections.

Technical Manual

See the preprocessing function blocks in this document for the possible

signal sources.

Operation setting is used to enable or disable the function. The corresponding

Protection functions

Residual current (measured or calculated)

Residual voltage (measured or calculated)

The function requires that all three voltage

channels are connected for calculating the re-

VT connection must

sidual voltage. Setting

be "Wye" in that particular UTVTR.