Monitored Data; Operation Principle; Function Inputs - ABB REL650 Technical Manual

1MRK 506 382-UEN A
7.6.6
7.6.7
7.6.7.1
Line distance protection REL650 2.2 IEC
Technical manual

Monitored data

Table 106: SDEPSDE Monitored data
Name Type
INCOSPHI REAL
IN REAL
UN REAL
SN REAL
ANG FI-RCA REAL

Operation principle

Function inputs

The function is using phasors of the residual current and voltage. Group signals I3P
and U3P containing phasors of residual current and voltage which are taken from
pre-processor blocks.
The sensitive directional earth fault protection has the following sub-functions
included:
Directional residual current protection measuring 3I
φ is defined as the angle between the residual current 3I
(|φ=ang(3I )-ang(U )|). The reference voltage (Uref) is the polarizing quantity
0 ref
which is used for directionality and is defined as Uref = -3U
-3U inversely rotated by the set characteristic angle RCADir. RCADir is normally
0
set equal to 0 in a high impedance earthed network with a neutral point resistor as
the active current component is appearing out on the faulted feeder only. RCADir is
set equal to -90° in an isolated network as all currents are mainly capacitive. The
function operates when 3I
Values (Range) Unit
-
-
-
-
-
·cos φ gets larger than the set value.
0
Section 7
Current protection
PID-3892-MONITOREDDATA v6
Description
A Magnitude of residual
current along the
polarizing quantity
3I0cos(Fi-RCA)
A Measured magnitude of
the residual current 3I0
kV Measured magnitude of
the residual voltage 3U0
MVA Measured magnitude of
residual power
3I03U0cos(Fi-RCA)
deg Angle between 3U0 and
3I0 minus RCA (Fi-RCA)
·cos φ
0
and the reference voltage
0
—jRCADir
e , that is
0
SEMOD171963-4 v5
SEMOD171963-8 v7
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