Siemens SIPROTEC 7SJ61, Руководство пользователя, Страница: 159 / 454

Functions
2.10 Intermittent Ground Fault Protection
SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008 159
Table 2-8 Unrestricted messages
Table 2-9 shows all messages subject to a restraint mechanism avoiding a message burst during an intermittent
ground fault:
Table 2-9 Buffered messages
Before they are entered in the fault log (event buffer) and transmitted to the system interface or CFC, the mes-
sages of table 2-9 are buffered (starting with the first pickup message received after
„Intermitt.EF“
was
signalled). The buffering does not apply for signalling to relays and LEDs as it is required by time-graded pro-
tection systems for reverse interlocking. The intermediate buffer can store a maximum of two status changes
(the most recent ones) for each message.
Buffered messages are signalled to the fault log, CFC and to the system interface with the original time flag
only when a TRIP command is initiated by a protective function other than the intermittent ground fault protec-
tion. This ascertains that a pickup, although delayed, is always signalled in association with each TRIP com-
mand.
All pickup messages, which usually do not occur during an intermittent ground fault, are not affected by this
mechanism. This includes the pickup and TRIP commands of the following protective functions:
• Breaker failure protection,
• Thermal Overload Protection.
FNo. Message Explanation
1800 „50-2 picked up“ 50-2 picked up
7551 „50-1 InRushPU“ 50-1 InRush picked up
7552 „50N-1 InRushPU“ 50N-1 InRush picked up
7553 „51 InRushPU“ 51 InRush picked up
7554 „51N InRushPU“ 51N InRush picked up
7565 „Ia InRush PU“ 50/51 phase A InRush picked up
7566 „Ib InRush PU“ 50/51 phase B InRush picked up
7567 „Ic InRush PU“ 50/51 phase C InRush picked up
7564 „Gnd InRush PU“ Ground InRush picked up
FNo. Message Explanation
1761 „50(N)/51(N) PU“ 50(N)/51(N) O/C PICKUP
1762 „50/51 Ph A PU“ 50/51 phase A picked up
1763 „50/51 Ph B PU“ 50/51 phase B picked up
1764 „50/51 Ph C PU“ 50/51 phase C picked up
1810 „50-1 picked up“
50-1
picked up
1820 „51 picked up“
51
picked up
1765 „50N/51NPickedup“ 50N/51N picked up
1831 „50N-2 picked up“
50N-2
picked up
1834 „50N-1 picked up“
50N-1
picked up
1837 „51N picked up“
51-N
picked up
5159 „46-2 picked up“
46-2
picked up
5165 „46-1 picked up“
46-1
picked up
5166 „46-TOC pickedup“
46-TOC
picked up
1221 „50Ns-2 Pickup“
50Ns-2
picked up
1224 „50Ns-1 Pickup“
50Ns-1
picked up
1227 „51Ns Pickup“
50Ns
picked up
6823 „START-SUP pu“ Startup supervision Pickup