Sampled Values Configuration Example

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TEST UNIVERSE

Sampled Values Configuration Example

OMICRON Test Universe

Manual Version: OMSV.AE.2 - Year 2010 © OMICRON electronics. All rights reserved. This manual is a publication of OMICRON electronics GmbH. All rights including translation reserved. Reproduction of any kind, e.g., photocopying, microfilming, optical character recognition and/or storage in electronic data processing systems, requires the explicit consent of OMICRON electronics. Reprinting, wholly or in part, is not permitted. The product incomputeration, specifications, and technical data embodied in this manual represent the technical status at the time of writing and are subject to change without prior notice. We have done our best to ensure that the incomputeration given in this manual is useful, accurate and entirely reliable. However, OMICRON electronics does not assume responsibility for any inaccuracies which may be present. The user is responsible for every application that makes use of an OMICRON product.

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SV Configuration Example

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.

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SV Configuration Example

The Test Set The applicable test sets need to have an Ethernet interface for IEC 61850 communication: At the time of writing, these are the CMC 256 with NET-1 Option, the CMC 256plus, the CMC 353, the CMC 356 and the CMC 850. In the remainder of this document, this specific type of equipment is simply referred as the "Test Set". It provides the following features: • Publishing sampled values according to 9-2LE. • Configuration software module, which is used to set up the publishing of SVs. This module can be embedded in an OMICRON Control Center test plan to reconfigure the test set during a test of a multifunctional relay. OMICRON has integrated the SV features into the test set in a way that the sampled values published are mapped to the secondary voltage outputs and the current output group A of the test set. The published sampled values are scaled to primary values according to the settings in the Test Object. The SV configuration module enables or disables the publishing of the SV stream and allows the setup the parameters of the stream. The configuration is performed via the SV Configuration module and is kept completely outside of the other test modules. The test modules do not even know if the IED receives the simulated values via secondary quantities or as sampled values. This way, all OMICRON test modules are immediately available for testing IEC 61850 compliant IEDs. The method of using the protection testing functions of the software remains completely unchanged and does not need to be further explained in this example.

About the Internet Protocol The Internet Protocol (IP) is not used for the transmission of sampled values. Anyway, it is used for controlling the test set from the PC. The related settings are made in the test set Association and Configuration utility which can be accessed from the OMICRON Start Page. Further details can be found in the related help and documentation. IP may be also used for setting the relay. In this given case, the relay setting program PCM600 can access the relay via the Ethernet using IP. The ABB relay uses local control to set an IP address. This device only works with a fixed (static) IP address. The IP settings of the relay must always be set manually to match the network configuration that the relay is connected to.

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SV Configuration Example

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.

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SV Configuration Example

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.

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SV Configuration Example

Figure 3 Parameters of Merging Units

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SV Configuration Example

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):

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SV Configuration Example

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).

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SV Configuration Example

button, the SV configuration is transferred to the test set. The progress bar By pressing the start 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.

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SV Configuration Example

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).

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SV Configuration Example

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.

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SV Configuration Example

Figure 9 Sampled Values in Ethereal / Wireshark

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SV Configuration Example

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

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