ABB REG650 - Page 65

Where I = U
gen
/ √(3) / ForwardX = 14107 A. The actual CT ratio must be applied
to this primary current so that correct value of the secondary injected current can
be calculated.
Expected results: As shown in Figure 14 for the test with 49 Hz. Periodical trip
commands in zone 2 (TRIPZ2) with 1 Hz.
IEC10000141-1-en.vsd
-0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1
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Real part (R) of Z in Ohms
Imaginary part (X) of Z in Ohms
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trajectory
Z(R, X)
R
Trajectory of the Z(R, X) for:
I = I(50Hz) + I(49Hz).
I(50Hz) determines point A;
I(49Hz) makes Z(R, X) rotate
SE
Zone 1
Trajectory of the Z(R, X) for
I = I(50Hz) + I(51Hz)
is identical, but the direction
of the rotation is the opposite
OOS relay
Ztr
lens
→
120°
X-line
→
determined
by the
setting
ReachZ1
RE
A = ForwardX
→
Zone 2
Zone 1
X
IEC10000141 V1 EN
Figure 13: Trajectory of the impedance Z(R, X) for the injected current with
two components: a 50 Hz component and a minor component
with 49 Hz
1MRK 502 049-UEN A Section 6
Testing functionality
57
Commissioning manual