Siemens siprotec SJ62 User Manual page 233

2 Functions
Action Time
Delay of Dead Time
Start
Reclosing Pro-
grams
231
The action time serves for monitoring the time between a device pickup and the trip
command of a protective function configured as starter. The action time is launched
when pickup of any function is detected, which is set as source of the automatic reclo-
sure program. Protection functions which are set to Alarm Only or which in principle
should not start a reclosing program do not trigger the action time.
If a protective function configured as starter initiates a trip command during the action
time, the automatic reclosure program is started. Trip commands of a protective func-
tion configured as starter occurring in the time between expiration of the action time
and dropout of the device pickup cause the dynamic blocking of the automatic reclos-
ing program. Trip commands of protective functions which are not configured as
starter do not affect the action time.
If the automatic reclosure program interacts with an external protection device, the
device pickup for start of the operating time is communicated to the automatic reclos-
ing program via binary input 2711 „>79 Start".
The initiation of the dead time can be delayed after a 79 start of the binary input
message 2754 „>79 DT St.Delay". The dead time is not initiated as long as the
binary input is active. The initiation takes place only with dropout of the binary input.
The delay of the dead time start can be monitored at parameter 7118 T DEAD DELAY.
If the time elapses and the binary input is still active, the Automatic Reclosing
System 79 changes to the status of the dynamic blocking via (2785 „79
DynBlock"). The maximal time delay of the dead time start is logged by the annun-
ciation 2753 „79 DT delay ex.".
Depending on the type of fault, two different reclosing programs can be used. The fol-
lowing applies:
• The single phase fault (ground fault) reclosing program applies when all fault pro-
tection functions, which initiate automatic reclosure, detected a phase-to-ground
fault. The following conditions must apply: only one phase, only one phase and
ground or only ground have picked up. This program can be started via a binary
input as well.
• The multiple phase fault (phase fault program) reclosing program applies to all
other cases. That is, when elements associated with two or more phases pickup,
with or without the pickup of ground elements, the phase reclosing program is exe-
cuted. In addition, when automatic reclosing is initiated by other functions, such as
negative sequence elements, this program is started. This program can be started
via a binary input as well.
The reclosure program evaluates only elements during pick up as elements dropping
out may corrupt the result if they drop out at different times when opening the circuit
breaker. Therefore, the ground fault reclosure program is executed only when the el-
ements associated with one particular phase pick up until the circuit breaker is
opened; all others conditions will initiate the phase fault program.
For each of the programs, up to 9 reclosing attempts can be separately programmed.
The first four reclosing attempts can be set differently for each of the two reclosing pro-
grams. The fifth and following automatic reclosures will correspond to the fourth dead
time.
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015