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X
R
Phase-to-Earth
Phase-to-phase
X
R
(2·Z
1source
+ Z
0source
)/3 + Z
E
Z
1source
Z
1Line
(2·Z
1Line
+ Z
0Line
)/3
Figure 550: Tripping characteristic in case the zone characteristic is "Mho (circular)"
and Pol quantity zone is "Cross pol"
In case of positive-sequence polarization "Pos. seq. volt.", the polarization voltage
is the positive-sequence voltage. The voltage phase angle is rotated to match
the original fault loop voltage. The positive-sequence polarization expands the
tripping characteristic according to the prevailing system conditions. In case of
short circuit faults, the circle expands as a function of the source impedance
magnitude Z
1source
/2. In case of an earth fault, the circle expands as a function of
source impedance and earthing impedance magnitudes: (Z
1source
+ Z
0source
)/3 + Z
E
.
Phase-to-phase/three-phase
X
R
Z
1source
/2
Z
1Line
X
R
Phase-to-Earth
(Z
1source
+ Z
0source
)/3 + Z
E
(2·Z
1Line
+ Z
0Line
)/3
Figure 551: Tripping characteristic in case the zone characteristic is "Mho (circular)"
and Pol quantity zone is "Pos. seq. volt."
One alternative for polarization is also "Self pol" despite the drawbacks when using
it as a polarization method. The mho circle does not expand when using this
polarization method.
In case of cross and positive-sequence polarization, the expansion of the mho circle
is a positive feature as the fault resistance coverage is increased. The reach of the
zone is not affected by the expansion. The greatest expansion is obtained with
cross-polarization.
1MRS759142 F
Protection functions
REX640
Technical Manual
977
Содержание RELION REX640
Страница 1: ... RELION PROTECTION AND CONTROL REX640 Technical Manual ...
Страница 2: ......
Страница 3: ...Document ID 1MRS759142 Issued 2023 02 07 Revision F Copyright 2023 ABB All rights reserved ...
Страница 167: ...Figure 62 Signal outputs in power supply module 1MRS759142 F Basic functions REX640 Technical Manual 167 ...
Страница 184: ...Figure 84 mA channels working as mA outputs Basic functions 1MRS759142 F 184 REX640 Technical Manual ...
Страница 1868: ...Figure 989 ANSI extremely inverse time characteristics General function block features 1MRS759142 F 1868 REX640 Technical Manual ...
Страница 1869: ...Figure 990 ANSI very inverse time characteristics 1MRS759142 F General function block features REX640 Technical Manual 1869 ...
Страница 1870: ...Figure 991 ANSI normal inverse time characteristics General function block features 1MRS759142 F 1870 REX640 Technical Manual ...
Страница 1874: ...Figure 995 ANSI long time inverse time characteristics General function block features 1MRS759142 F 1874 REX640 Technical Manual ...
Страница 1875: ...Figure 996 IEC normal inverse time characteristics 1MRS759142 F General function block features REX640 Technical Manual 1875 ...
Страница 1876: ...Figure 997 IEC very inverse time characteristics General function block features 1MRS759142 F 1876 REX640 Technical Manual ...
Страница 1877: ...Figure 998 IEC inverse time characteristics 1MRS759142 F General function block features REX640 Technical Manual 1877 ...
Страница 1878: ...Figure 999 IEC extremely inverse time characteristics General function block features 1MRS759142 F 1878 REX640 Technical Manual ...
Страница 1882: ...Figure 1002 RI type inverse time characteristics General function block features 1MRS759142 F 1882 REX640 Technical Manual ...
Страница 1885: ...Figure 1004 UK rectifier inverse time characteristic 1MRS759142 F General function block features REX640 Technical Manual 1885 ...
Страница 1959: ......