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Zx
X
R
Blinder B, ref la+pi/2
Blinder B, ref IZ KR
L line, ref la
Resulting characteristic
L line, ref la+|Kn|·IN
IEC11000268_1_en.vsd
Zx Rev
L line, ref la+|Kn|·IN
L line, ref la
*IZKR=(I+IN·KN)·LineAng·Zx
IEC11000268 V1 EN
Figure 36:
Quadrilateral characteristic with Reach and Blinder characteristic
Reach characteristic
The reach characteristic looks for the reach part of the quadrilateral characteristic.
Following two calculations of forward and reverse voltages are done in this:
VKRforward V (I IN KN) LineAng Zx
= - +
×
×
×
GUID-3EF66E0D-E9A4-48F2-8695-85858AAC343D V1 EN
(Equation 1)
VKRreverse V (I IN KN) LineAng ZxRev
= + +
×
×
×
GUID-CA0875B7-C09B-4560-9246-BA8496EBE21E V1 EN
(Equation 2)
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
I + IN · KN
is the zero sequence compensated current for phase to ground loops
KN = 0
for phase to phase loops
1MRK 506 335-UUS A
Section 6
Impedance protection
105
Technical manual
Содержание REL650 series
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