Signals - ABB RELION REX640 Technical Manual

Section 4
Protection functions
4.2.9.7
552
MFADPSDE supports fault direction indication in operate and non-operate directions
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 direction of MFADPSDE can be set as forward or reverse. The operation
characteristic is defined by a tilted operation sector, which is universally valid both in
unearthed and compensated networks. The tilt of the operation sector should be
selected based on the measurement errors of the applied residual current and voltage
measurement transformers.
The operating time characteristic is according to the definite time (DT).
The function contains a blocking functionality to block function outputs, timers or the
function itself.
MFADPSDE supports both tripping and alarming operation modes. For the alarming
earth-fault protection application, the function contains a dedicated operation mode.
MFADPSDE provides reliability and sensitivity of protection with a single function.
This enables a protection scheme implementation that is simpler than separate fault
type dedicated earth-fault functions which need to be coordinated. Other advantages
of MFADPSDE include versatile applicability, good selectivity, good sensitivity and
easy setting principles.
Three instances (stages) of MFADPSDE are available.

Signals

Table 563: MFADPSDE Input signals
Name Type
IRES SIGNAL
URES SIGNAL
BLOCK BOOLEAN
RELEASE BOOLEAN
RESET BOOLEAN
Table 564: MFADPSDE Output signals
Name Type
OPERATE BOOLEAN
START BOOLEAN
BLK_EF BOOLEAN
INTR_EF BOOLEAN
PEAK_IND BOOLEAN
FAULT_DIR Enum
DIRECTION Enum
Default Description
- Residual current
- Residual voltage
0=False Block signal for activating the blocking mode
0=False External trigger to release neutral admittance
protection
0=False External trigger to reset direction calculatio
Description
Operate
Start
Block signal for EF to indicate opposite direction
peaks
Intermittent earth-fault indication
Current transient detection indication
Detected fault direction
Direction information
1MRS759142 C
REX640
Technical Manual