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IEC 61850-9-2 conformance test and the required network bandwidth

IEC 61850-9-2 conformance test and the required network bandwidth. Smart Grid Testing department Woohyun Seo. Contents. Merging Unit Introduction, Advantages, Standards Tripping in Process Bus Conformance test Network Bandwidth for Process Bus Conclusion. 1. Merging Unit - Introduction.

aubrey-durham
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IEC 61850-9-2 conformance test and the required network bandwidth

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  1. IEC61850-9-2 conformance test and the required network bandwidth Smart Grid Testing department WoohyunSeo

  2. Contents • Merging Unit • Introduction, Advantages, Standards • Tripping in Process Bus • Conformance test • Network Bandwidth for Process Bus • Conclusion

  3. 1. Merging Unit - Introduction Busbar Non-Conventional CTs/VTs • Advantage • . Good saturation curve • Disadvantage • . Signal level output • . Noise influence Conventional CTs/VTs Proprietary Link Proprietary Link Merging Unit • Analog Input Transformers • Analog Measurement • A/D conversion • are moved away from the IEDs and “are placed” into the merging unit Device control interface Controlled Ethernet Ports Process Bus Time synch Configuration Bay controller CSWI, CSYN, … Line protection PIOC, PTOV, …

  4. 1. Merging Unit - Advantages • Advantage of process bus with MERGING UNIT • Reduce wiring cables and # of CTs/VTs • In conventional scheme, every IED needs CT(s) and/or VT(s) for processing • Improved measuring accuracy • Short distance between CTs/VTs and signal processor • Adopting high-performance eCT/eVT • Small, Light, Broad dynamic range, Isolation between primary & secondary circuits, etc • Unified platform for information sharing • Merging unit broadcast the digitized measured data based on IEC 61850 standard

  5. 1. Merging Unit - Standards Merging Unit Signal processing interface Digital interface (Communication) IEC TC38 WG37 IEC TC57 WG10 IEC 61869-7, ADDITIONAL REQUIREMENTS FOR ELECTRONIC VOLTAGE TRANSFORMERS IEC 61850-9-1, Specific Communication Service Mapping (SCSM) – Sampled values over serial unidirectional multidrop point to point link Withdrawn IEC 61869-8, ADDITIONAL REQUIREMENTS FOR ELECTRONIC CURRENT RANSFORMERS IEC 61850-9-2, Specific communication service mapping (SCSM) – Sampled values over ISO/IEC 8802-3 IEC 61869-9, DIGITAL INTERFACE FOR INSTRUMENT TRANSFORMERS Implementation Implementation Guideline for Digital Interface to Instrument Transformers using IEC 61850-9-2 … IEC 61869-13, Stand Alone Merging Unit Conformance test procedure Test procedures for Sampled Values Publishers according to the "Implementation Guideline for Digital Interface to Instrument Transformers using IEC 61850-9-2" (9-2LE) Not published

  6. 2. Tripping in Process Bus GOOSE OUT

  7. 2. Tripping in Process Bus SAMPLED VALUES GOOSE IN GOOSE OUT Time requirement is more critical!!!

  8. 2. Tripping in Process Bus • A/D signal processing time delay • Primary condition for available protection • Guideline : 3 ms (IEC 60044-8) • Packet jitter and latency control • Part of performance test • Only the total number of packets in 1 sec existed • Standard based syntax • Following IEC 61850-9-2 and IEC 61869 series • Network bandwidth • Lack of bandwidth makes packet loss • Out of range from conformance test

  9. 3. Conformance test • Conformance test procedure • Documentation : 2 test cases • Configuration : 9 test cases • Communication services : 17 test cases • 50/60 Hz, 80/256 samples According to “Guideline”, Time master is based on “PPS”

  10. 3. Conformance test • SV conformance test • Verify conformity and performance • Performance is very important for MU • Accuracy test is not included • Conformity • Connecter and Link layer format verification • 100Base-FX full duplex with ST, MT-RJ, LC fibers or Rj45 • APDU or ASDU format verification • Quality and Test bit verification

  11. 3. Conformance test • Performance test • SV maximum delay criterion : ~3 ms(3.3 ms) • Verification # of messages per cycle Publisher(MU) PPS pulse Subscriber SV with SmpCnt=0 SV delay … … … PPS pulse PPS pulse 288000 messages for 80 samples of 60 Hz Jitter and latency control are required!

  12. 3. Conformance test • Limitation of SV conformance test • Not verifying focusing on packet treatment • What if MU makes the signal processing delay? CT/VT or eCT/eVT Vo, Io PPS pulse SV delay Signal processing delay Vo, Io SV with SmpCnt=0 Real tripping time may be delayed

  13. 4. Network Bandwidth for Process Bus • Background from IEC 61850-9-1 • Telegram length : 888bit(packet) + 96bit(interFrame) • BW : 80samples*60Hz*984bits < 5Mbps (per stream) Reliable?

  14. 4. Network Bandwidth for Process Bus • Simple test • Merging Unit • 100Mbps, Max 2 streams, 80samples/Hz • Time Synch • 1 PPS from GPS • Switch • Separate network only for process bus with MU • Switching latency : 7 micro second • Switching bandwidth : 9.2 Gbps • Testing tool • Smart bit applications • Packet size : 140 bytes(SMV packet : 128 bytes)

  15. 4. Network Bandwidth for Process Bus • 1 stream Latency Packet Loss Throughput Network load : 5.88 Mbps • Switching bandwidth(9 Gbps) is enough to handle this amount of traffic load • (9,000 / 5.88 = 1,530 ports can be supported)

  16. 4. Network Bandwidth for Process Bus • 2 streams Latency Packet Loss Throughput Network load : 11.6 Mbps = 2*5.8 Mbps • Network load for 2 streams is similar to twice one for 1 stream

  17. 5. Conclusion • Expectation • Network Bandwidthmeasurement in the real (simulated) process bus network • Theoretically, 100 Mbps based network can handle more than 10 MUs • But, need to check if how many MUs can implemented • For more stable process bus implementation, the critical points will be • Actual A/D signal processing time delay in device • Packet jitter and latency delay from device

  18. Thank you for listening Any Questions? Whseo@keri.re.kr 031-8040-4421

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