Siemens SIPROTEC 4, User Manual

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matic reclosing function. Each address designates a protection element or protection function together with
its ANSI synonym, for example
50-2
for the high-set element 50-2 of the non-directional time overcurrent
protection (address 7152).
The setting options have the following meaning:
•
Starts 79
the protective element initiates the automatic reclosure via its trip command;
No influence
the protective element does not start the automatic reclosure, it may however be initi-
ated by other functions;
Stops 79
the protective element blocks the automatic reclosure, it cannot be started by other func-
tions; a dynamic blocking is initiated.
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 automatic 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
The addresses 7200 to7211 and 7248, 7249, 7256, 7257 and 7175 to 7177 allow the AR to control the cycle
of the different protection functions. This enables any protection elements to be blocked selectively, set to
operate instantaneously or according to the configured delay times.
The following options are available:
•
Set value T=T
The protection element is delayed as configured, i.e. the automatic reclosing function
does not effect this element;
instant. T=0
The protection element becomes instantaneous if the automatic reclosing function is
ready to perform the mentioned cycle;
blocked T=∞
The protection element is blocked if the auto-reclose function reaches the cycle defined
in the parameter. The element picks up, however, time expiry of the element is blocked by this setting.
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:
Adsress 7129
DEADTIME 2: PH
Dead time for the 2nd reclosing attempt phase
Asdress 7130
DEADTIME 2: G
Dead time for the 2nd reclosing attempt ground
Addresses 7212 to 7223,
7250, 7251, 7258, 7259
and 7178 to 7180 Cyclic control of the various protection functions by the 2nd reclosing
attempt
For the 3rd cycle:
Address 7131
DEADTIME 3: PH
Dead time for the 3rd reclosing attempt phase
Address 7132
DEADTIME 3: G
Dead time for the 3rd reclosing attempt ground
Addresses 7224 to 7235,
7252, 7253, 7260, 7261
and 7181 to 7183 Cyclic control of the various protection functions by the 3rd reclosing
attempt
For the 4th cycle:
Functions
2.16 Automatic Reclosing System 79
SIPROTEC 4, 7SJ62/64, Manual 249
C53000-G1140-C207-8, Edition 08.2016