Based on these voltages the reach characteristic is implemented with Sine comparator
(TRUE, if {Im(S1) · Re(S2) - Im(S2) · Re(S1)}>0) for following comparisons:
0 arg(I) arg(VKRForward) 180
<
-
<
GUID-797D640A-0107-4C8F-B8EF-A71E116535FB V1 EN
(Equation 3)
0 arg(VKRReverse) arg(I) 180
<
-
<
GUID-7E158828-B0FF-45C2-ABC0-DF115196D6EE V1 EN
(Equation 4)
When both the conditions are true, then the reach characteristic comparator is set as true
for phase to phase loops (or when load compensation is disabled).
X
L
180°
VKRForward
IZKR
V
I
R
IRef
IRef
a=7°
Zx
ZxRev
ANSI11000266_1_en.vsd
ANSI11000266 V1 EN
Figure 37:
Reach characteristic part of quadrilateral characteristic
only forward characteristic is shown. Similarly, reverse
characteristic is also possible with VKRreverse.
In phase to ground loops along with the above comparison, one more additional criterion
is also checked with IRef (= I+IN ·1.5) for ground load compensation.
0 arg(I Ref ) arg(VKRForward) 180
<
-
<
GUID-6AF75940-3FE7-48FB-A28F-6463B5082E8D V1 EN
(Equation 5)
0 arg(VKRReverse) arg(I Ref ) 180
<
-
<
GUID-001C2691-638A-4D62-A402-369CF8CE80C1 V1 EN
(Equation 6)
If all the four comparators are true then reach characteristic of phase to ground loop is set
as TRUE.
Section 6
1MRK 506 335-UUS A
Impedance protection
106
Technical manual
Содержание REL650 series
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