Blinder characteristic
The blinder characteristic looks for the resistive reach part of the quadrilateral
characteristic. Following calculations of forward and reverse voltages are done for this.
For phase to ground loop:
VBR V I RFPGx
VAR V I RFPGx
= - ×
= + ×
GUID-1370F9BA-BB31-4B33-B9D1-1C8FED7B517E V1 EN
(Equation 7)
For phase to phase loop:
VBR V I RFPPx
VAR V I RFPPx
= - ×
= + ×
GUID-9170691F-94E2-4BDD-8AD6-4176B10AC73E V1 EN
(Equation 8)
where
I
is the measurement loop current
For example, in phase to ground loop I = IA, and for phase to phase loop I = IBC
V
is the measurement loop voltage
For example, in phase to ground loop V = VA, and for phase to phase loop V = VBC
Based on these voltages the blinder characteristic is implemented with Sine comparator
(TRUE, if {Im(S1) · Re(S2) - Im(S2) · Re(S1)}>0) for following comparisons:
(
)
( )
(
)
( )
(
)
(
)
0 arg VBR
arg I
pi/2
180
or
0
arg I
pi/2
arg VAR
180
<
-
+
<
<
+
-
<
GUID-51E2D9C7-E2A8-43ED-8389-0909F2419800 V1 EN
(Equation 9)
(
)
(
)
(
)
(
)
0 arg VBR
arg IZKR
180
or
0 arg IZKR
arg VAR
180
<
-
<
<
-
<
GUID-68ED768F-8AB4-42AF-93DE-9768FD346BB2 V1 EN
(Equation 10)
1MRK 506 335-UUS A
Section 6
Impedance protection
107
Technical manual
Содержание REL650 series
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