Analog Channel Configuration; Operation Principle - ABB RELION REX640 Technical Manual

Section 4
Protection functions
4.2.9.4
4.2.9.5
524
MFADPSDE supports fault direction indication both in operate and in non-operate
direction, which can be used during fault location process. The in-built transient
detector can be used to identify restriking or intermittent earth faults, and discriminate
them from permanent or continuous earth faults.
The operation characteristic is defined by a tilted operation sector, which is
universally valid for unearthed and compensated networks.
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 559: Analog inputs
Input
IRES
URES
See the preprocessing function blocks in this document for the
possible signal sources.
There are a few special conditions which must be noted with the configuration.
Table 560: Special conditions
Condition
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 Operation setting is used to enable or disable the function. The corresponding
parameter values are "on" and "off".
Description
Residual current (measured or calculated)
Residual voltage (measured or calculated)
Description
The function requires that all three voltage
channels are connected to calculate the residual
VT connection must be "Wye" in
voltage. Setting
that particular UTVTR.
1MRS759142 C
REX640
Technical Manual