EQUATION2050-ANSI V1 EN-US (Equation 164)
XoffsetZ1 and XoffsetZ2, of
fset of impedance circle top along the X axis, are given
negative value if X < 0.
XoffsetZ1: It is recommended to set XoffsetZ1= - X
d
'/2 and
Z1diameter = 100% of
ZBase.
tZ1: tZ1 is the setting of trip delay for Z1 and this parameter is recommended to set 0.1
s.
© ABB Group
June 21, 2010 | Slide 1
IEC10000201 V1 EN-US
Figure 152: Loss of excitation characteristics recommended by IEEE
It is recommended to set XoffsetZ2 equal to - X
d
'/2 and Z2diamater equal to X
d
.
tZ2: tZ2 is the setting of trip delay for Z2 and this parameter is recommended to set 2.0
s not to risk unwanted trip at oscillations with temporary apparent impedance within
the characteristic.
Section 8 1MRK 502 071-UUS A
Impedance protection
310 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Application manual
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