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excitation faults) to protect the system. The logic for the same has been shown in
.
The over/under fueling and over/under excitation logic will be checked
only if the local active and reactive power are above 2% of nominal value
respectively. When the local active and reactive power are less than 2%,
the
OPERATE
output is issued instantaneously.
Table 1347: Criteria for activation of STOP_ENGINE output
Fault type
Criteria
Output
Over fueling fault
MIN (P1 … P8) <
Min active power
That is, One among the network generators (ex-
cluding the local generator) enter reverse power
OR
F >
Max Freq limit
+
Max Freq deviation
STOP_ENGINE
Under fueling fault (MAX (P1 … P8) >
Max active power
That is, One among the network generators enter
over power region
OR
F <
Min Freq limit
–
Max Freq deviation
)
AND
P < 0.0
That is, local generator enters reverse power zone.
Table 1348: Criteria for activation of DE_EXCITE output
Fault type
Criteria
Output
Over excitation
fault
MIN(Q1 … Q8) <
Min reactive power
OR
Uavg >
Max voltage limit
+
Max Volts deviation
DE_EXCITE
Under excitation
fault
(Uavg <
Min voltage limit
–
Max Volts deviation
OR
I_MAX > 100% of nominal value
I_MAX = Maximum of the three phase currents ob-
tained from input I3P)
AND
Q < 0.0
That is, local generator enters reverse reactive pow-
er zone.
The activation of
STOP_ENGINE
or
DE_EXCITE
outputs, activates the
PRE_TRIP
output and initiates the operate delay timer. The timer characteristic is based on DT.
Once the time set by
Operate delay time elapses or when active power (for fueling
1MRS759142 F
Condition monitoring functions
REX640
Technical Manual
1417
Содержание RELION REX640
Страница 1: ... RELION PROTECTION AND CONTROL REX640 Technical Manual ...
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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 ...
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