IEC06000437_2_en.vsd
IED
B
A
E
B
E
A
X’
d
X
T
X
S
Zone 1
Zone 2
jX
R
X’
d
X
T
X
S
B
A
d
Apparent generator
impedance
Pole slip
impedance
movement
IEC06000437 V2 EN
Figure 107:
Movements in the impedance plain
where:
X'
d
= transient reactance of the generator
X
T
= short-circuit reactance of the step-up transformer
Z
S
= impedance of the power system A
The detection of rotor angle is enabled when:
•
the minimum current exceeds 0.10 I
N
(I
N
is
IBase
parameter set under general
setting).
•
the maximum voltage falls below 0.92
UBase
•
the voltage Ucosφ (the voltage in phase with the generator current) has an angular
velocity of 0.2...8 Hz and
•
the corresponding direction is not blocked.
Section 7
1MRK502052-UEN B
Impedance protection
256
Technical manual
Summary of Contents for Relion REG670
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