7.3.6.2
Simplified logic diagrams
schematically presents the creation of the phase-to-phase operating
conditions.
IEC10000226-1-en.vsd
&
&
t
10 ms
t
20 ms
&
Bool to
integer
STCNDLE
BLOCK
&
Block
0
3
0.1
I
<
0
3
0.4
phmax
I
I
<
×
&
OR
0
3
0.05
I
³
0
3
0.2
phmax
I
I
³
×
R
X
L1
L1L2
&
IEC10000226 V1 EN
Figure 61:
Phase-to-phase L1L2 operating conditions (residual current criteria)
Special attention is paid to correct phase selection at evolving faults. A STCNDLE
output signal is created as a combination of the load encroachment characteristic and
current criteria, refer to figure
. This signal can be configured to STCND functional
input signals of the distance protection zone and this way influence the operation of
the phase-to-phase zone measuring elements and their phase related starting and
tripping signals.
7.3.7
Technical data
Table 65:
LEPDIS technical data
Function
Range or value
Accuracy
Load encroachment criteria:
Load resistance, forward and
reverse
Safety load impedance angle
(1.00–3000.00) Ω/phase
(5-85) degrees
± 5.0% static accuracy
± 2.0 degrees static angular
accuracy
Conditions:
Voltage range: (0.1-1.1) x U
r
Current range: (0.5-30) x I
r
Reset ratio
105% typically
-
Section 7
1MRK 504 135-UEN A
Impedance protection
140
Technical manual
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