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IEC 61850-9-2 conformance test and the required network bandwidth Smart Grid Testing department Woohyun Seo.

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Presentation on theme: "IEC 61850-9-2 conformance test and the required network bandwidth Smart Grid Testing department Woohyun Seo."— Presentation transcript:

1 IEC conformance test and the required network bandwidth Smart Grid Testing department Woohyun Seo

2 1.Merging Unit Introduction, Advantages, Standards 2.Tripping in Process Bus 3.Conformance test 4.Network Bandwidth for Process Bus 5.Conclusion Contents

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

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 standard

5 1. Merging Unit - Standards Merging Unit Signal processing interface Digital interface (Communication) IEC TC38 WG37IEC TC57 WG10 IEC , ADDITIONAL REQUIREMENTS FOR ELECTRONIC VOLTAGE TRANSFORMERS IEC , ADDITIONAL REQUIREMENTS FOR ELECTRONIC CURRENT RANSFORMERS IEC , DIGITAL INTERFACE FOR INSTRUMENT TRANSFORMERS IEC , Stand Alone Merging Unit … Not published IEC , Specific Communication Service Mapping (SCSM) – Sampled values over serial unidirectional multidrop point to point link IEC , Specific communication service mapping (SCSM) – Sampled values over ISO/IEC Withdrawn Implementation Implementation Guideline for Digital Interface to Instrument Transformers using IEC Conformance test procedure Test procedures for Sampled Values Publishers according to the "Implementation Guideline for Digital Interface to Instrument Transformers using IEC " (9-2LE)

6 GOOSE OUT 2. Tripping in Process Bus

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

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

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 PPS pulse SV with SmpCnt=0 SV delay Publisher(MU) Subscriber messages for 80 samples of 60 Hz … … … PPS pulse 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? PPS pulse SV with SmpCnt=0 SV delay Vo, Io Real tripping time may be delayed CT/VT or eCT/eVT Signal processing delay

13 4. Network Bandwidth for Process Bus Background from IEC –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 Rate Tested(%) (01,01,01) to (01,01,02) (us)-CT Rate Tested(%) (01,01,01) to (01,01,02) (%) Passed Rate(%) (01,01,01) to (01,0 1,02) (pks/sec) Throughput Latency Packet Loss Network load : 5.88 Mbps Switching bandwidth(9 Gbps) is enough to handle this amount of traffic loadSwitching 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 Rate Tested(%) (01,01,01) to (01,01,02) (us)-CT Rate Tested(%) (01,01,01) to (01,01,02) (%) Passed Rate(%) (01,01,01) to (01,0 1,02) (pks/sec) Throughput Latency Packet Loss Network load : 11.6 Mbps = 2*5.8 Mbps Network load for 2 streams is similar to twice one for 1 streamNetwork load for 2 streams is similar to twice one for 1 stream

17 5. Conclusion Expectation –Network Bandwidthmeasurement –Network Bandwidth measurement 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 more stable process bus implementation –For more stable process bus implementation, the critical points will be in deviceActual A/D signal processing time delay in device from devicePacket jitter and latency delay from device

18 Thank you for listening Any Questions?


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