1. Heading:28-32pt Color: R0 G85 B167 Font: Arial Content: 16-24pt Color: Black Font: Arial Title:32-40pt Font: Arial (Bold) Sub-title: 28 pt Font: Arial Color: white Practice Improvement Cooperation Innovation NR Electric Co., Ltd. Key technologies and project implementation

2. Heading:28-32pt Color: R0 G85 B167 Font: Arial Content: 16-24pt Color: Black Font: Arial 2 www.nrelect.com Overview Key technologies - Time synchronization technology - Network traffic control - Virtual circuit on-line supervision Case study - ECVT, OCT, MU, ICU - IEEE 1588

3. Heading:28-32pt Color: R0 G85 B167 Font: Arial Content: 16-24pt Color: Black Font: Arial 3 www.nrelect.com Key technologies 1.How to ensure reliability of protection and control based on GPS clock in case of GPS system failures? - Time synchronization technology 2.How to ensure reliability of protection and control in case of communication system failures? - Network traffic control 3.How to simplify operation and maintenance? - Virtual circuit on-line supervision

4. Heading:28-32pt Color: R0 G85 B167 Font: Arial Content: 16-24pt Color: Black Font: Arial 4 www.nrelect.com Issue :Problems of network sampling - Network time delay is uncertain - Extern GPS clock is used for synchronization - Strong dependence on time synchronization network - External clock failure will bring sampling out of step, then relay function will be influenced Issue 1 and Solution

5. Heading:28-32pt Color: R0 G85 B167 Font: Arial Content: 16-24pt Color: Black Font: Arial 5 www.nrelect.com Solution: Compensating delay in switch Issue 1 and Solution - Switch pastes the delay which SV message flow through - Relay minus the message delay time to realize synchronization - Reduce or eliminate the dependence of synchronization network

6. Heading:28-32pt Color: R0 G85 B167 Font: Arial Content: 16-24pt Color: Black Font: Arial 6 www.nrelect.com Switch paste the delay time in the SV message Relay compensate this time delay Issue 1 and Solution Up : ∆t = ∆t 0 +…+∆tn Down: ∆t = ∆t 0 ’ ∆t<1us

7. Heading:28-32pt Color: R0 G85 B167 Font: Arial Content: 16-24pt Color: Black Font: Arial 7 www.nrelect.com Time delay flow through switch - Test result CascadeBpsTime Delay（us）error（ns） 1100/1000M0.75~0.940 2 1000M1.65~1.8560 100M1.6~1.860 3 1000M2.45~2.780 100M2.4~2.780 4 1000M3.3~3.55100 100M3.2~3.55100 Issue 1 and Solution

8. Heading:28-32pt Color: R0 G85 B167 Font: Arial Content: 16-24pt Color: Black Font: Arial 8 www.nrelect.com Issue - Normal: Line relay  SV < 8M  GOOSE < 2M - network congestion:  SV+GOOSE > 100M,  Important SV data is dropped Figure.1 Figure.2 Issue 2 and Solution

9. Heading:28-32pt Color: R0 G85 B167 Font: Arial Content: 16-24pt Color: Black Font: Arial 9 www.nrelect.com Solution - SV+GOOSE > 100M, maybe IED1 GOOSE port net storm happen - GOOSE data is dropped by traffic control module in switch before output Issue 2 and Solution

10. Heading:28-32pt Color: R0 G85 B167 Font: Arial Content: 16-24pt Color: Black Font: Arial 10 www.nrelect.com Virtual circuit on-line supervision Validate online SV/GOOSE message with the SCD configuration Issue 3 and Solution

11. Heading:28-32pt Color: R0 G85 B167 Font: Arial Content: 16-24pt Color: Black Font: Arial 11 www.nrelect.com Generate the physical/virtual circuit dynamically according to the SCD configuration and on-line message Rapid positioning fiber or switch fault according to the IED’s communication failure Issue 3 and Solution Virtual circuit topologyPhysical route topology

12. Heading:28-32pt Color: R0 G85 B167 Font: Arial Content: 16-24pt Color: Black Font: Arial 12 www.nrelect.com Case Study : Dalv Substation First substation employing IEEE 1588, Service Date: Dec, 2009 -AIS, 2 *110/10kV transformers, 2 *110kV lines, 27*10kV bays Future

13. Heading:28-32pt Color: R0 G85 B167 Font: Arial Content: 16-24pt Color: Black Font: Arial 13 www.nrelect.com Case Study : OCT, ECVT, MU & ICU in Dalv ECVT OCT ECT ECVT MU2 MU1 MU MU2 MU1 MU2 MU1 MU2 MU1 MU2 MU1 MU2 MU1 MU2 MU1 MU&IBC MU MU&IBC IBC Prot. &ICU Prot. &IBC 110kV 10kV ECT MU

14. Heading:28-32pt Color: R0 G85 B167 Font: Arial Content: 16-24pt Color: Black Font: Arial 14 www.nrelect.com 110kV Switchyard -ECVT (Composited ECT/VT) & OCT used -Dual MUs for 1 ECVT or OCT -Single ICU for each breaker -MUs in 110kV using IEC 61850-9-2, sampling rate: 4k sample/s, 50Hz 10kV Switchyard -ECT & ECVT used -Single MU for each ECT or ECVT -ICU integrated in MU in transformer outgoing bays -ICU integrated in Relay in feeder bays Case Study : OCT, ECVT, MU & ICU in Dalv

15. Heading:28-32pt Color: R0 G85 B167 Font: Arial Content: 16-24pt Color: Black Font: Arial 15 www.nrelect.com Case Study : Communication Network in Dalv Line1 Prot. Trans.1 Prot. Trans.2 Prot.Line2 Prot. Bus Prot.Section Prot. Line1 MUs Trans.1 MUsSection MUs Trans.2 MUs Line2 MUs Line1 ICU Section ICU Line2 ICU Trans. MU&ICU 10kV MU Section Prot.&IBC Bus Prot. Feeder Prot.&IBC Trans. MU&ICU 10kV MU 110kV10kV Server/Workstation GatewayGPS Receiver MMS, 10kV GOOSE, SNTP SV (IEC 61850-9-2), 110kV GOOSE, IEEE1588 10kV SV

16. Heading:28-32pt Color: R0 G85 B167 Font: Arial Content: 16-24pt Color: Black Font: Arial Thanks for Your Attention! Version 2014 Copyright 2014 NR Electric Co., Ltd. All rights reserved www.nrelect.com