Siemens SIPROTEC 4 7SD80 User Manual

[logik-we-verriegelung-wlk-020802, 1, en_US]
Figure 2-79 Reclosure interlocking
The conditions for reclosure interlocking and the control commands to be blocked can be parameterized. The
correspondingly routed binary inputs and outputs are wired externally or linked via user-defined logic func-
tions (CFC).
If, for example, each trip by the protection function has to cause a closing lock-out, then combine the tripping
command
Relay TRIP (no. 511) with the binary input >Lockout SET . If automatic reclosure is applied,
only the final trip of the protection function should activate reclosing lock-out. Please bear in mind that the
message
Definitive TRIP (no. 536) applies only for 500°ms. Then combine the output alarm Defini-
tive TRIP (no. 536) with the interlocking input >Lockout SET , so that the interlocking function is not
established when an automatic reclosure is still expected to come.
The output alarm LOCKOUT can also be applied to interlock certain closing commands (externally or via CFC),
e.g. by combining the output alarm with the binary input
>Blk Man. Close (no. 357) or by connecting the
inverted alarm with the bay interlocking of the feeder.
The output alarm LOCKOUT can also be applied to interlock certain closing commands (externally or via CFC),
e.g. by combining the output alarm with the binary input >Blk Man. Close (no. 357) or by connecting the
inverted alarm with the bay interlocking of the feeder.
The reset input >Lockout RESET (no. 386) resets the interlocking state. This input is initiated by an external
device which is protected against unauthorized or unintentional operation. The interlocking state can also be
controlled by internal sources using CFC, e.g. a function key, operation of the device or using DIGSI on a PC.
For each case please ensure that the corresponding logic operations, security measures, etc. are taken into
account when routing the binary inputs and outputs and may have to be considered when creating the user-
defined logic functions. See also the SIPROTEC 4 System Description.
Breaker Tripping Alarm Suppression
While every trip command by a protection function is final on a feeder without automatic reclosure, it is desir-
able, when using automatic reclosure, to prevent the operation detector of the circuit breaker (transient
contact on the breaker) from sending an alarm if the trip of the breaker is not final (Figure 2-80).
To accomplish this, the signal from the circuit breaker can be routed via an output contact of the 7SD80
(output alarm
CB Alarm Supp , no. 563) that is configured accordingly. In the idle state and when the device
is turned off, this contact is closed permanently. This requires an output contact with normally closed contact
to be routed. Which contact has to be routed depends on the device version. See also the general diagrams in
the Appendix.
Prior to the command, with the internal automatic reclosure in the ready state, the contact opens so that no
signal from the circuit breaker is forwarded. This is only the case if the device is equipped with internal auto-
matic reclosure and if the latter was considered when configuring the protection functions (address 133).
Also when closing the breaker via the binary input >Manual Close (no 356) or via the integrated automatic
reclosure the contact is interrupted so that the breaker alarm is inhibited.
Further optional closing commands which are not sent via the device cannot be considered. Closing
commands for control can be linked to the alarm suppression via the user-defined logic functions (CFC).
Functions
2.16 Function Logic
SIPROTEC 4, 7SD80, Manual 179
E50417-G1100-C474-A2, Edition 02.2018

Siemens SIPROTEC 4 7SD80 Specifications

General

Brand	Siemens
Model	SIPROTEC 4 7SD80
Category	Power distribution unit
Language	English