Siemens siprotec SJ62 User Manual page 246

Initiation and
Blocking of Auto-
reclosure by Pro-
tective Elements
(configuration)
Dead Times (1st
AR)
Cyclic Control of
Protective Func-
tions via Automatic
Reclosure
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
At addresses 7150 to 7164, reclosing can be initiated or blocked for various types of
protective elements. They constitute the interconnection between protective elements
and auto-reclose function. Each address designates a protective function together
with its ANSI synonym e.g., 50-2 for the high-set element 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 com-
mand;
No influence the protective element does not start the automatic reclosure, it
may however be initiated by other functions;
Stops 79 the protective element blocks the automatic reclosure, it cannot be
started by other functions; a dynamic blocking is initiated.
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 al-
lowed. Standard values are 0.3 s to 0.6 s. In radial systems longer dead times are al-
lowed.
Addresses 7200 to 7211 allow cyclic control of the various protective functions by the
automatic reclosing function. Thus protective elements can be blocked selectively,
made to operate instantaneously or according to the configured delay times. The fol-
lowing 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.
2.14 Automatic Reclosing System 79
244