Siemens siprotec 7SA522, Руководство пользователя

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Functions
6-240
7SA522 Manual
C53000-G1176-C119-2
Conditions which cause reclosure interlocking and control commands which have to
be interlocked can be set individually. The two inputs and the output can be wired via
the correspondingly allocated binary inputs and outputs or be linked via user-defined
logic functions (CFC).
If, for example, each trip by the protection function has to cause a closing
lock-out, then combine the tripping command “
5HOD\75,3
” (FNo 511) with the bina-
ry input “
!/RFNRXW6(7
”. If automatic reclosure is applied, only the final trip of the
protection function should establish closing lock-out. Then combine the output alarm
“
'HILQLWLYH75,3
” (FNo 536) with the interlocking input “
!/RFNRXW6(7
”, so that
the interlocking function is not established when an automatic reclosure is still expect-
ed to come.
In the most simple case the output alarm “
/2&.287
” (FNo 530) can be allocated to
the output which trips the circuit-breaker without creating further links. Then the trip-
ping command is maintained until the interlock is reset via the binary reset input. Nat-
urally it has to be ensured in advance that the close coil at the circuit breaker - as is
usually done - is blocked in the event of maintained tripping command.
The output alarm ”
/2&.287
” can also be applied to interlock certain closing com-
mands (externally or via CFC), e.g. by combining the output alarm with the binary input
“
!&ORVH&PG%ON
” (FNo 357) or by connecting the inverted alarm with the bay in-
terlocking of the branch.
The reset input “
!/RFNRXW5(6(7
” (FNo 386) resets the interlocking state. This input
is initiated by an external device which is protected against unauthorized or uninten-
tional operation. The interlocking state can also be controlled by internal sources, e.g.
a function key, operation of the device or using DIGSI
®
4 on a PC.
For each case please make sure the corresponding logical combinations, security
measures, etc. are taken into account for the routing of the binary inputs and outputs
(Section 5.2) and are also considered for the setting of user-defined logic functions
(Section 5.3), if necessary.
Breaker Tripping
Alarm Suppression While on feeder without automatic reclosure every trip command by a protection func-
tion is final, it is desirable, when using automatic reclosure, to prevent the operation
detector of the circuit-breaker (intermediate contact on the breaker) from sending an
alarm if the trip of the breaker is not final (Figure 6-128).
For this purpose, the signal from the circuit-breaker is routed via a correspondingly al-
located output contact of the 7SA522 (output alarm ”CB Alarm Supp”, FNo 563). In
the idle state and when the device is turned off, this contact is interrupted. Therefore
an output contact with a normally open contact (NO contact) has to be allocated. In
the 7SA522 this is provided by the binary output(s) BA13 (and BA16 and BA24 de-
pending on the version), as described in Subsection 8.1.3.
Prior to the command, with the internal automatic reclosure in the ready state, the con-
tact in open so that no signal from the circuit-breaker is forwarded. This is only the
case if the device is equipped with internal automatic reclosure and if the latter was
taken into consideration when configuring the protection functions
(Section 5.1, address
).
Also when closing the breaker via the binary input “
!0DQXDO&ORVH
” (FNo 356) or
via the integrated automatic reclosure the contact is interrupted so that no breaker
alarm can be sent.
Further optional closing commands which are not sent via the device cannot be taken
into consideration. Closing commands for control can be linked to the alarm suppres-
sion via the user-defined logic functions (CFC).