Sampled Values Configuration Example

27

Sampled Values Configuration Example

TEST UNIVERSE

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SV Configuration Example

2008 OMICRON electronics Test Universe 2.22 3

Testing an IEC 61850 Compliant Relay with a CMC Test Set and the

Sampled Values Configuration Module

Introduction This example focuses on the configuration of the Sampled Values (SV) features of a CMC test set. The details of protection testing are not covered. Thanks to OMICRON's smart implementation of the features, the established methods for protection testing are not affected by the new signaling mechanism. The example is performed using a protective relay REL 670 series manufactured by ABB. Some of the screenshots shown below are taken from the configuration tool PCM600. Some of the terms and settings are also specific due to this specific product reference, but similar methods and tools will apply for other vendor's relays and software as well. The detailed explanation of the internal structure of a relay modeled according to IEC 61850 and the related services is also beyond the scope of this document. In the following, it is assumed that the reader is familiar with the basic principles of IEC 61850.

Terms: IEC 61850, SV, 9-2LE IEC 61850, the international standard for communication networks and systems for power utility automation, defines (among many other items) mechanisms for real-time messaging over Ethernet networks. Sampled Values (SV) (sometimes also called Sampled Measured Values (SMV) or Sampled Analog Values (SAV)) services are defined in IEC 61850-7-2. Their transmission via Ethernet networks is defined in IEC 61850-9-2. This part of IEC 61850 applies to electronic current and voltage transformers, merging units, and intelligent electronic devices for example protection units, bay controllers and meters. To allow an easier implementation, the UCA International Users Group published the document "Implementation Guideline for Digital Interface to Instrument Transformers using IEC 61850-9-2". As this implementation guideline defines a subset of IEC 61850-9-2, it is commonly referred to as "9-2 Light Edition" or short "9-2 LE". The SV Configuration module sets up the test set to publish sampled values. It provides automatic configuration during testing and proper documentation of the settings.



Protection Testing with Sampled Values

Configuration of the Relay / Subscriber of SV PCM600 allows the configuration of your IED regarding control, protection and communication. It can import engineering files according to IEC 61850-6 (scd-file substation configuration description) and is connected to a system configurator so far. With this software you have to prepare the IED to subscribe the SVs. The steps necessary will be described in this chapter. First of all you have to assign the data from the merging unit to a software slot (SW_slot). This has to be done in the configuration software of PCM600- CAP (Figure 1)

Figure 1 Function Selector Tool

Once the merging units are configured and the configuration in the IED is compiled, the inputs for sampled values can be used as normal analog inputs. To connect the inputs you have to open the "Signal Matrix Tool" (Figure 2) in PCM600 and connect all signals.



Figure 2 Signal Matrix Tool

The last step is the configuration of SV streams to be subscribed in the IED (Figure 3). The most important is the Sampled values ID (SvID). The other parameters describe the name of the inputs, CT star point and synchronization mode.



Figure 3 Parameters of Merging Units



Configuration of the Publisher The SV configuration module you can find on the Start Page of OMICRON's Test Universe under the item "IEC 61850" (Figure 4)

Figure 4 Test Universe

Another possibility is of course embedding the module into an occ-file. In the module only a few parameters have to be set up. It is possible to receive the information needed to set up the software of the SCD-file of your substation or manually. The import of an SCD-file is quite simple: Menu File- Import SCL-File. Another possibility is the manual setup as described below (Figure 5):



Figure 5 SV Configuration

To publish SV with the test set, the following parameters must be known: Sampled Value ID (svID) Multicast MAC Address of the SV-stream Application ID (APPID) VLAN ID and VLAN Priority

The ID of the SV refers to the setup of the IED (Figure 3) in our case "ABB_MU0101". SV are published as multicasts, the Multicast-MAC-Address is defined by the system configurator. In our case this is the first recommended MAC address for SV: 01-0C-CD-04-00-00 The APPID has to be unique, in our case 16384 (0x4000). IEC 61850 uses VLANs (virtual LANs) according to IEEE 802.1q. VLANs allow a segregation of networks and the usage of priorities. The VLAN ID and the priority have to be defined for the publisher. In our case the test set publishes in VLAN 0 (common in substations) with medium priority (4). To produce faulty or invalid SV streams the quality information can be changed. 0x0 indicates a proper stream. The last setting is the Ethernet port of the test sets to be used for publishing the SV. The same port can be used for communication with Test Universe, GOOSE and SV. The selection is between electrical (ETH1) and optical (ETH2).



By pressing the start button, the SV configuration is transferred to the test set. The progress bar indicates the progress of the configuration process. The "Test State" indicates if the new configuration could be successfully established (Figure 6).

Figure 6 Configuration Finished

Now the test sets starts to publish SV.



The published sampled values are scaled to primary values (as defined in the test object -Figure 7). They correspond to the analog voltage and current values generated at the voltage outputs and the current output group A of the test set.

Figure 7 Test Object

The specified hardware configuration for using sampled values is 3 voltages and 3 currents (current group A; see Figure 8).



Figure 8 Output Configuration Details

Other hardware configurations may work as well, but this neither tested nor guaranteed. The SV are now published by the test set (Figure 9) and simultaneously the secondary values are provided.



Figure 9 Sampled Values in Ethereal / Wireshark



Performing the Tests From the test module's view, the analog outputs are configured in the hardware configuration and applied for the testing as usual. Using any module a protection test can be performed, for instance with State Sequencer as shown in Figure 10. In this example the IED trips with a GOOSE, to test this an GOOSE configuration is necessary.

Figure 10 Test with SVs in the State Sequencer
Testing an IEC61850 Compliant Relay withaCMC Test Set and the SampledValuesConfiguration ModuleIntroductionTerms: IEC 61850, SV, 9-2LEThe Test SetAbout the Internet ProtocolProtection Testing with Sampled ValuesConfiguration of the Relay / Subscriber of SVConfiguration of the PublisherPerforming the Tests

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Sampled Values Configuration Example