Siemens SIPROTEC 7SJ61, Руководство пользователя, Страница: 178 / 454

Functions
2.11 Automatic Reclosing System 79
SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008
178
Fifth to Ninth Reclosing Attempt
If more than four cycles are configured, the dead times set for the fourth cycle also apply to the fifth through to
ninth cycle.
Blocking Three-Phase Faults
Regardless of which reclosing program is executed, automatic reclosing can be blocked for trips following
three-phase faults (address
7165 3Pol.PICKUP BLK
). The pickup of all three phases for a specific overcur-
rent element is the criterion required.
Blocking of Automatic Rreclosure via Internal Control
The auto-reclose function can be blocked, if control commands are issued via the integrated control function of
the device. The information must be routed via CFC (interlocking task-level) using the CMD_Information func-
tion block (see the following figure).
Figure 2-61 Blocking of the automatic reclose function using the internal control function
Zone Sequencing
Not available for models 7SJ61**-** A **-
At address
7140 ZONE SEQ.COORD.
, the zone sequencing feature can be turned
ON
or
OFF
.
If multiple reclosures are performed and the zone sequencing function is deactivated, only those reclosing
cycles are counted which the device has conducted after a trip command. With the zone sequencing function
switched on, an additional sequence counter also counts such auto-reclosures which (in radial systems) are
carried out by relays connected on load side. This presupposes that the pickup of the 50-1/50N-1 elements
drops out without a trip command being issued by a protective function initiating the auto-reclose function. The
parameters at addresses
7200
through
7241
(see paragraph below at "Initiation and Blocking of Reclosing by
Protective Functions" and "Controlling Overcurrent Protection Stages via Cold Load Pickup") can thus be set
to determine which protective elements are active or blocked during what dead time cycles (for multiple reclos-
ing attempts carried out by relays on the load side).
In the example shown in Figure "Zone sequencing with a fault occurring at Tap Line 5 and the busbar" (see
Figure ) in the functional description, the zone sequencing was applied in the bus relay. Furthermore, as from
the second auto-reclosure the 50-2 elements (also applicable to the 50-3 elements) must be blocked, i.e.
address
7214 bef.2.Cy:50-2
must be set to
blocked T=
∞
. The zone sequencing of the feeder relays is
switched off but the 50-2 elements must also be blocked after the second reclosing attempt. Moreover, it must
be ensured that the 50-2 elements start the automatic reclosing function: Set address
7152 50-2
to
Starts
79
.