Siemens SIPROTEC 7SJ61 Manual page 177

Dead Times (1st AR)
Addresses 7127 and 7128 are used to determine the duration of the dead times of the 1st cycle. The time
defined by this parameter is started when the circuit breaker opens (if auxiliary contacts are allocated) or when
the pickup drops out following the trip command of a starter. Dead time before first auto-reclosure for reclosing
program "Phase" is set in address 7127 DEADTIME 1: PH, for reclosing program "ground" in address 7128
DEADTIME 1: G. The exact definition of the programs is described in the functional description at margin
heading "Reclosing Programs". The length of the dead time should relate to the type of application. With longer
lines they should be long enough to make sure that the fault arc disappears and that the air surrounding it is
de-ionized and auto-reclosure can successfully take place (usually 0.9 s to 1.5 s). For lines supplied by more
than one side, mostly system stability has priority. Since the de-energized line cannot transfer synchronizing
energy, only short dead times are allowed. Standard values are 0.3 s to 0.6 s. In radial systems longer dead
times are allowed.
Cyclic Control of Protective Functions via Automatic Reclosure
Addresses 7200 to 7205 as well as 7248 and 7249 allow cyclic control of the various protection functions by
the automatic reclosing function. Thus protective elements can be blocked selectively, made to operate instan-
taneously or according to the configured delay times. The following options are available:
The following options are available:
• Set value T=T The protective element is delayed as configured i.e., the auto-reclose function does not
effect this element;
instant. T=0 The protective element becomes instantaneous if the auto-reclose function is ready to
perform the mentioned cycle;
blocked T=∞ The protective element is blocked if the auto-reclose function reaches the cycle defined in
the parameter.
Dead Times (2nd to 4th AR)
If more than one reclosing cycle was set, you can now configure the individual reclosing settings for the 2nd to
4th cycle. The same options are available as for the first cycle.
For the 2nd cycle:
Address 7129
Address 7130
Addresses 7212
to 7217
For the 3rd cycle:
Address 7131
Address 7132
Addresses 7224
to 7229
For the 4th cycle:
Address 7133
Address 7134
Addresses 7236
to 7241
SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008
DEADTIME 2: PH Dead time for the 2nd reclosing attempt "Phase"
DEADTIME 2: G Dead time for the 2nd reclosing attempt "Ground"
allow cyclic control of the various protective functions by the
2nd reclosing attempt
DEADTIME 3: PH Dead time for the 3rd reclosing attempt "Phase"
DEADTIME 3: G Dead time for the 3rd reclosing attempt "Ground"
allow cyclic control of the various protective functions by the
3rd reclosing attempt
DEADTIME 4: PH Dead time for the 4th reclosing attempt "Phase"
DEADTIME 4: G Dead time for the 4th reclosing attempt "Ground"
allow cyclic control of the various protective functions by the
4th reclosing attempt
Functions
2.11 Automatic Reclosing System 79
177