scheider electric MiCOM P746, Technical Manual

Page: 421 / 530

SCADA Communications P746/EN SC/G31
MiCOM P746 (SC) 13-
39
SC
3. Support for time synchronization over an Ethernet link
Time synchronization is supported using SNTP (Simple Network Time Protocol); this
protocol is used to synchronize the internal real time clock of the relays.
4. GOOSE peer-to-peer communication
GOOSE communications of statuses are included as part of the IEC 61850
implementation. Please see section 6.6 for more details.
5. Disturbance record extraction
Extraction of disturbance records, by file transfer, is supported by the MiCOM relays.
The record is extracted as an ASCII format COMTRADE file.
Setting changes (e.g. of protection settings) are not supported in the current IEC 61850
implementation. In order to keep this process as simple as possible, such setting changes
are done using MiCOM S1 (V2 or Studio) Settings & Records program. This can be done as
previously using the front port serial connection of the relay, or now optionally over the
Ethernet link if preferred (this is known as “tunneling”).
6.3.2 IEC 61850 Configuration
One of the main objectives of IEC 61850 is to allow IEDs to be directly configured from a
configuration file generated at system configuration time. At the system configuration level,
the capabilities of the IED are determined from an IED capability description file (ICD) which
is provided with the product. Using a collection of these ICD files from varying products, the
entire protection of a substation can be designed, configured and tested (using simulation
tools) before the product is even installed into the substation.
To aid in this process, the MiCOM S1 Support Software provides an IED Configurator tool
which allows the pre-configured IEC 61850 configuration file (an SCD file or CID file) to be
imported and transferred to the IED. Alongside this, the requirements of manual
configuration are satisfied by allowing the manual creation of configuration files for MiCOM
relays based on their original IED capability description (ICD file).
Other features include the extraction of configuration data for viewing and editing, and a
sophisticated error checking sequence which ensures that the configuration data is valid for
sending to the IED and that the IED will function within the context of the substation.
To aid the user, some configuration data is available in the ‘IED CONFIGURATOR’ column
of the relay user interface, allowing read-only access to basic configuration data.
6.3.2.1 Configuration Banks
To promote version management and minimize down-time during system upgrades and
maintenance, the MiCOM relays have incorporated a mechanism consisting of multiple
configuration banks. These configuration banks are categorized as:
•
Active Configuration Bank
•
Inactive Configuration Bank
Any new configuration sent to the relay is automatically stored into the inactive configuration
bank, therefore not immediately affecting the current configuration. Both active and inactive
configuration banks can be extracted at anytime.
When the upgrade or maintenance stage is complete, the IED Configurator tool can be used
to transmit a command (to a single IED) authorizing the activation of the new configuration
contained in the inactive configuration bank, by switching the active and inactive
configuration banks. This technique ensures that the system down-time is minimized to the
start-up time of the new configuration. The capability to switch the configuration banks is also
available via the ‘IED CONFIGURATOR’ column.
For version management, data is available in the ‘IED CONFIGURATOR’ column in the relay
user interface, displaying the SCL Name and Revision attributes of both configuration banks.