ANSI10000226-2-en.vsd
&
&
&
Bool to
integer
DLECND
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
A
AB
&
0
10 ms
20 ms
0
ANSI10000226 V2 EN
Figure 86:
Phase-to-phase AB operating conditions (residual current criteria)
Special attention is paid to correct phase selection at evolving faults. A DLECND output
signal is created as a combination of the load encroachment characteristic and current
criteria, refer to figure
. This signal can be configured to PHSEL 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 pickup and tripping signals.
7.5.7
Technical data
Table 82:
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 V
n
Current range: (0.5-30) x I
n
Reset ratio
105% typically
-
1MRK 502 048-UUS A
Section 7
Impedance protection
191
Technical manual
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