ABB Relion 615 series, Technical Manual

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9.4.2 Function block
79
INIT_1
INIT_2
INIT_3
INIT_4
INIT_5
INIT_6
DEL_INIT_2
DEL_INIT_3
DEL_INIT_4 OPEN_CB
BLK_RECL_T
BLK_RCLM_T
BLK_THERM
CB_POS
CB_READY
INC_SHOTP
INHIBIT_RECL
CLOSE_CB
CMD_WAIT
INPRO
LOCKED OUT
PROT_CRD
UNSUC_RECL
AR_ON
READY
ACTIVE
RECL_ON
SYNC
GUID-3AB0D8C9-15A8-42C5-B6C1-6F21F21C79D6 V1 EN
Figure 502: Function block
9.4.3 Functionality
About 80 to 85 percent of faults in the MV overhead lines are transient and automatically
cleared with a momentary de-energization of the line. The rest of the faults, 15 to 20
percent, can be cleared by longer interruptions. The de-energization of the fault location
for a selected time period is implemented through automatic reclosing, during which most
of the faults can be cleared.
In case of a permanent fault, the automatic reclosing is followed by final tripping. A
permanent fault must be located and cleared before the fault location can be re-energized.
The autoreclosing function 79 can be used with any circuit breaker suitable for
autoreclosing. The function provides five programmable autoreclosing shots which can
perform one to five successive autoreclosings of desired type and duration, for instance
one high-speed and one delayed autoreclosing.
When the reclosing is initiated with pickup of the protection function, the autoreclosing
function can execute the final trip of the circuit breaker in a short trip time, provided that
the fault still persists when the last selected reclosing has been carried out.
9.4.3.1 Protection signal definition
The Control line setting defines which of the initiation signals are protection pickup and
trip signals and which are not. With this setting, the user can distinguish the blocking
signals from the protection signals. The
Control line setting is a bit mask, that is, the lowest
bit controls the
INIT_1
line and the highest bit the
INIT_6
line. Some example
combinations of the Control line setting are as follows:
Section 9
1MAC059074-MB A
Control functions
992 615 series ANSI
Technical Manual