IEC 61850 SCL Manager Details
Key Functionality
System Specification
The system specification as per IEC 61850 covers definition of complete electrical system interconnections (SLDs) required for a substation and defining the functionalities (Logical Nodes) that need to be performed by each element or group of elements together. Creating substation specification in SCL Manager involves the following steps
Draw complete SLD using the graphical interface available in SCL Manager. This involves creation of substation elements and its interconnection using connectivity node (point or bus-bar).
Choose the functionality required on each element of substation which is done by selection of suitable Logical Nodes (LNs) from the list of logical nodes.
Save the complete system specification as System Specification Description (.SSD) file.
Substation Configuration
The substation configuration consists of linking the functionality elements described in the system specification to the actual functional points (LNs under the IEDs) & description of complete communication schemes. Following steps are needed in SCL Manager for completing the Substation Configuration.
Load the file containing complete system specification (.SSD) or create the complete specification using system specification feature.
Create IED sections which are needed for the substation.
Import the specific ICD to each IED section & define the communication attributes for the specific IED. This will create the actual data and functional points for the complete substation.
Link the substation functionalities defined in the specification to the actual functional points. It is achieved by linking the LNs available in the substation elements to the LNs of loaded IEDs.
Save the complete substation configuration in Substation Configuration Description (.SCD) file.
IED Capability Description
This functionality is required if SCL Manager is used to configure any new vendor device which does not have an ICD but will completely work depending on the configuration file created as per SCL standards. This is especially applicable for Protocol Gateways having IEC 61850 server and a user configuration file as per SCL are required for its suitable working. This is also applicable for IEC 61850 implementation in an already existing IED. The ICD file of the device for system configurator and CID file that need for the device can be generated from Kalki SCL Manager which requires the following steps.
Define an IED section.
Create separate logical divisions (LDs) within the physical device as required based on the application & add mandatory functions (LNs - LLN0 & LPHD) with required data & attributes under each logical divisions. E.g.: A physical device related to the protection can have logical divisions of measurement (MEAS), protection (PROT) and disturbance (DIST).
Add other functionalities (LNs) related to the logical division by choosing the same from the template and select the required data & attributes. E.g.: Measurement logical division can have MMXU, MMXN, MDIF LNs , Protection logical division can have PTOC, PDIF, PTEF LNs and disturbance logical division can have RDRE, RADR, RBDR LNs.
Assign /change the default values for various elements like control model by adding / editing data object instances (DOI) under each logical nodes.
Create required data sets under each logical device and attach data to the same from different LNs using FCDA.
Define required Report Control Blocks under each logical node and attach the relevant data set to the same.
Define required GSE control blocks under LLN0 and associate the suitable dataset to the same.
Save the file as .ICD / .CID as per the requirement.
Mapping external signals
Mapping external signals involves the mapping of source data coming through control blocks like GSE, RCB to destination data points available under logical nodes of different IEDs. Mapping of external signals requires the following steps.
Load the file containing complete substation configuration (.SCD) having multiple IED sections & choose option for mapping external signals.
Source Selection — Select the source IED, type of data transfer (GSE, RCB or Specific LN) & choose the data tag coming under GSE, RCB or LN.
Destination Selection — Map the specific tag to the destination logical node. Select destination IED, LN and choose automatic or manual entry for the destination identifier.
Save the complete mapping as part of .SCD file itself.
Other Functions
The other functionalities available in Kalki SCL Manager are as follows.
Validate SCL files - User can validate any SCL file (SCD, SSD, ICD or CID) by just choosing validate option and selecting the file. The validation results are logged into separate window indicating the complete details of failures.
Generate Communication / equipment Tags - User can generate complete communication / equipment tags from loaded SCD / SSD files. It can be saved to files which can be used for client applications.
File Types
SCL Manager allows user to create the following file formats as defined in IEC 61850 standards.
IED Capability Description (.ICD) File. It defines complete capability of an IED. The file contains a single IED section, an optional communication section and an optional substation part which denotes the physical entities corresponding to the IED.
System Specification Description (.SSD) File. This file contains complete specification of a substation automation system including single line diagram for the substation and its functionalities (logical nodes). This will have Substation part, Data type templates and logical node type definitions but need not have IED section.
Substation Configuration Description (.SCD) File. This is the file describing complete substation detail. It contains substation, communication, IED and Data type template sections. An .SSD file and different .ICD files contribute in making an SCD file.
Configured IED Description (.CID) File. It is a file used to have communication between an IED configuration tool to an IED. It can be considered as an SCD file stripped down to what the concerned IED need to know and contains a mandatory communication section of the addressed IED