Functions
298
7UM62 Manual
C53000-G1176-C149-3
2.46
Breaker Control
General
In addition to the protective functions described thus far, a control command process
is integrated in the SIPROTEC
®
7UM62 to coordinate the operation of circuit breakers
and other equipment in the power system. Control commands can originate from four
command sources:
−
Local operation using the keypad on the local user interface of the device
−
Operation using DIGSI
®
4
−
Remote operation using a substation automation and control system (e.g.
SICAM)
−
Automatic functions (e.g., using a binary input)
Single and double busbar systems are supported. The number of switchgear devices
to be controlled is, basically, limited by the number of binary inputs and outputs
present. Therefore, 7UM622 should be the preferred version. High security against
inadvertent device operations can be ensured if interlocking checks are enabled. A
standard set of optional interlocking checks is provided for each command issued to
circuit breakers/switchgear.
Logical Links Using
CFC
The 7UM62 can also execute user-defined logic functions. These logic functions can
be edited with the CFC (=Continuous Function Chart) tool. Interlocking and command
processing, as well as monitoring functions or processing of measured values, can be
programmed by simple drawing; no programming knowledge is required. The desired
functions can be put together from predefined function blocks which are grouped in a
library. Detailed information on CFC is contained in the SIPROTEC
®
4 System
Manual, Order No. E50417–H1176–C151, and in particular in the CFC Manual, Order
No. E50417–H1176–C098. A logic circuit is created with a PC using the DIGSI
®
4
software; the serial or service port is used for this.
When the device is delivered from the factory, it contains two standard CFC charts
(see Appendix A.9.7). One chart is used to allow switching of an annunciation/
measured value blocking by binary input (blocking of annunciations in test mode) (see
2.45.5.1). The other chart (see Figure A-49) provides for undercurrent monitoring of
three phase currents.
Operation Using
the Keypad on the
Local User
Interface
Control commands can be initiated using the keypad on the local user interface of the
relay (see also SIPROTEC
®
4 System Manual, Control of Switchgear). Using the
navigation keys
,
,
,
, the control menu can be accessed and the circuit
breaker/switchgear to be operated can be selected. After entering a password, a new
window is displayed in which multiple control actions (close, open, cancel) are
available and can be selected using the
and
keys. Next a security check takes
place. After the security check is completed, the
key must be pressed again to
carry out the command. If the ENTER key is not pressed within one minute, the
selection is cancelled. Cancellation via the ESC key is possible at any time before the
control command is issued.
If the attempted command fails, because an interlocking condition is not met, then an
error message appears in the display. The message indicates why the control
command was not accepted (see also SIPROTEC
®
4 System Manual). This message
must be acknowledged with ENTER before any further control commands can be
issued.
ENTER
ESC
