Residual Current Preprocessing Restctr; Identification; Function Block; Functionality - ABB RELION REX640 Technical Manual

1MRS759142 C
3.17.2
3.17.2.1
3.17.2.2
3.17.2.3
REX640
Technical Manual

Residual current preprocessing RESTCTR

Identification

Function description
Residual current preprocessing

Function block

GUID-992D312D-50B2-415F-B3DE-A5739EF9C5B8 V1 EN
Figure 71: Function block

Functionality

The residual current preprocessing function RESTCTR is used for setting up the
residual current measurement channels. Input channels for RESTCTR are either
physical hardware or IEC 61850-9-2 sampled value channels. The output
IRES_MEAS channel of RESTCTR can be connected to different applications which
require measured residual current.
The residual CTs' primary rated current can be set using Primary current setting. The
setting Secondary current defines the nominal current of the CT's secondary winding.
This is used as a reference to scale measurements accordingly.
Residual current magnitude correction of an external CT can be made using the
Amplitude Corr setting.
Residual current angle correction of an external CT can be made using the Angle
correction setting.
The Reverse polarity setting is used to reverse the polarity of the residual CT.
The WARNING output in the receiver is activated if the synchronization accuracy of
the sender or the receiver is worse than 4 μs. The output is held on for 10 seconds after
the synchronization accuracy returns within limits.
The ALARM in the receiver is activated if the synchronization accuracy of the sender
or the receiver is not within tolerances. The output is held on for 10 seconds after the
synchronization accuracy returns within limits. If the effect on protection is
negligible, the WARNING or ALARM outputs are not activated.
IEC 61850 IEC 60617
identification identification
RESTCTR RESTCTR
Section 3
Basic functions
ANSI/IEEE C37.2
device number
RESTCTR
185