Answers for infrastructure and cities.

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1 Seminar SRBE-KBVE Quoi de neuf dans les protections électriques Wat is er nieuw in de elektrische beveiligingen 26 September 2013 Exchange of time critical data for differential protection over packet oriented IP-networks Norbert Answers for infrastructure and cities.

2 Agenda Existing and future configurations Requirements for the differential protection Trial with a four terminal topology Step by step commissioning Results of a few tests Summary Seite 2

3 Reason for the pilot projects Digital communication networks based on SDH technology will be replaced in future through packet oriented IP-MPLS networks Are this networks suitable for the transmission of time critical data of the differential protection? Evalution in pilot projects together with customers and network providers Seite 3

4 Connection to IP based communication networks using existing devices and interfaces Configuration using IP networks Using the G703.6 (E1) interface over an external converter from Siemens Differential protection Converter 7XV5662-0AD00 O FO 820 nm, max. 1.5 km Sync. HDLC E G703.6 / E1 Wide area communication network using IP - MPLS Converter 7XV5662-0AD00 E G703.6 / E1 O FO 820 nm, max. 1.5 km Test configuration at TenneT TSO (Cisco) and Creos (Alcatel Lucent) together with 7SD52 Differential protection Configuration using IP networks Optical interface for the connection to the communication network using IEEE C37.94 FO 820 nm, max. 1.5 km Standard Interface with IEEE C37.94 (optical 2 Mbit/s) Wide area communication network using IP MPLS FO 820 nm, max.1.5 km IEEE C37.94 (optical 2 Mbit/s) Test configuration at Creos (Alcatel Lucent) together with 7SD52 Seite 4

5 Future connections to IP networks over optical Ethernet - interfaces Ethernet connection to IP networks over a pilot converters from Siemens Differential protection Pilot - converter Serial <-> Ethernet FO 820 nm, max. 1.5 km Sync. HDLC O O Ethernet 1300 nm 100 MBit/s Optical Ethernet Wide area communication network using IP - MPLS Pilot - converter Ethernet <-> Serial O Ethernet 1300 nm 100 MBit/s Optical Ethernet O FO 820 nm, max.1.5 km Differential protection Test configuration at TenneT TSO (Cisco) together with 7SD52 with connection to Ethernet over a pilot converter Future connection to IP - networks Ethernet 1300 nm 100 MBit/s Optical Ethernet Wide area communication network using IP - MPLS Ethernet 1300 nm 100 MBit/s Optical Ethernet Ethernet interface integrated into the protection device without external converter (future solution) Seite 5

6 Agenda Existing and future configurations Requirements for the differential protection Trial with a four terminal topology Step by step commissioning Results of a few tests Summary Seite 6

7 Requirements for the data transmission of the differential protection Undisturbed and errorless telegram transmission through data link and data conversion Disturbances are supervised by the differential relays (percentage error/minute or error/hour). Alarm indication if error rate is to high. Total transmission delay over the wide area network < 5 ms Average delay time will be measured by the differential relay Transmission delay increases the tripping time Equal transmission delay in receive and transmit direction Unsymmetrical delay lead to a differential current Unsymmetrical delay forces a higher differential set point Use of external GPS-synchronization (PPS) with permanent asymmetry in the communication network (unwanted due to high effort and cost) Seite 7

8 Requirements for the data transmission of the differential protection Telegram reception with constant time difference Required max. ± 300 µs -> Higher value lead to Delay time jump indication in the operational log Due to delay time jitter the differential protection becomes insensitive through it s internal adaptive self restraint algorithm Distance for the communication link max. 500 km (311 miles) FO cable (single mode) and max. 15 network router between Keep total delay time < 5 ms for such a connection Seite 8

9 Current phasors measured by the differential relays due to asymmetrical delay time Remote phasor transmitted over the communication link Differential current Local phasor Seite 9

10 Agenda Existing and future configurations Requirements for the differential protection Trial with a four terminal topology Step by step commissioning Results of a few tests Summary Seite 10

11 4 terminal topology with different communication connections Seite 11

12 Device configuration in the test racks Prot.devices 7SD523 #1 und #2 ASR 903 R11 ASR 901 ASR 901 R12 R12 ASR 903 R2 ASR 901 R14 ASR 903 R1, ASR 903 R13 Grandmaster Time Sync. Prot.devices 7SD523 #3 und #4 Ethernetconverter #2b #4b #4a #3b Currentinjection Ethernet-converter #1b #2a E1 -converter #1a ME3600X Test ME3600X Test Lastgenerator Network loadgenerator #4a #3b Current injection E1-converter #3a Seite 12

13 Agenda Existing and future configurations Requirements for the differential protection Trial with a four terminal topology Step by step commissioning Results of a few tests Summary Seite 13

14 Direct connection over single mode FO-link over the Ethernet converters Direct fiber optical connection over Ethernet. Use EN100-modules with single mode fiber optical transceiver/receiver Conversion from HDLC (serial) to Ethernet inside the Ethernet converter Jitter buffer and telegram fragmentation in the Ethernet converter Seite 14

15 Connection over G703.6 (E1) converter using a 2 Mbit/s Pseudo Wire Channel over Ethernet E1 <-> IP/MPLS conversion inside the router ASR903 (R11 / R13) Jitter - buffer set to 5 ms to compensate delay time jitter from the network QoS Pseudo Wire Connection with highest priority between R11 und R13 Seite 15

16 Delay time measurement through protection device #1 #R1 <-> #R3 #R1 <-> #R2 Seite 16

17 Connection over Ethernet converters with optical 100 Mbit/s interface to the routers Optical1300 nm 100 Mbit/s interface to router R13 and R14 QoS Pseudo Wire connection with highest priority between R13 and R14 Differential protection system works in a chain topology -> Diff. active Seite 17

18 Connection over Ethernet converter with optical 100 Mbit/s interface to the routers Optical 1300 nm 100 Mbit/s interface to router R12 and R14 QoS Pseudo Wire connection with highest priority between R12 und R14 Differential protection system works in a ring topology Seite 18

19 Delay time measurement through protection device #4 #R4 <-> #R3 #R4 <-> #R2 Laufzeitmessung durch Schutzgerät #4 Seite 19

20 Agenda Existing and future configurations Requirements for the differential protection Trial with a four terminal topology Step by step commissioning Results of a few tests Summary Seite 20

21 Tests for reduction of the delay time on the E1 - connection The jitter buffer is required to compensate delay time changes caused by the Ethernet network through stored and forwarded telegrams. Max. buffer time is a setting for the E1 interface of the router Default value 5 ms cause a delay time of 3,1 ms Successive reduction from 5 ms to 1 ms (minimal setting in the router) Protection device indicate no delay time jumps (precondition) Delay time reduced from 3,1 ms to 1,85 ms Transmission of used data slots of the E1 telegram (CESoPSN) 1 * 64 kb 32 * 64 kb Delay time reduced from 1,8 ms to1,4 ms Bandwidth reduction inside the Ethernet from 2 Mbit/s -> 500 kbit/s for the high priority Pseudo Wire connection with QoS Seite 21

22 Ethernet traffic overload with Traffic generators Injection of overload to check the stability of the Pseudo Wire connections Injection of > 1 Gbit/s with Traffic generators to overload the routers On priorized Pseudo Wire connections no telegram errors and delay time changes are registered by the protection devices Seite 22

23 Negative test: Protection communication programmed outside Pseudo Wire connection Protection device indicates telegram errors and delay time changes Switching from ring- und chain topology (connection losses) Differential protection not active for short time No stable connections can be established No trip due to this stress situation (with current injection into the devices) Seite 23

24 Switching of the E1 communication connection to a redundant path due to link failure Investigation of path rerouting under following aspects: Delay time measured for the redundant path Interruption time of the differential protection Stability of the differential protection -> Different delay time in transmit and receive direction under transient path switching conditions Seite 24

25 Switching of the E1 communication path to a redundant path due to link failure Umschalten des E1-Kommunikationspfades auf einen redundanten Ersatzweg Interruption of the differential protection (diff.active) <0,5 s No significant delay time changes through additional routers between No delay time difference in transmit and receive direction. Differential protection remain stable with current injection. No additional diff.current Seite 25

26 Futher measurement during the pilot project Loss of time synchronization of the Ethernet network Synchronization over PTP / IEEE 1588 (precision time protocol) or synchronization over Synchronous Ethernet Delay time jumps and loss of telegrams registered by protection devices Switch network components OFF/ON (e.g. router or converter) Remote setting update of routers and protection devices Variation of length of Ethernet packets -> Effect on delay time Bandwidth limitation for the QoS connection -> Security feature Tripping of the differential protection relays Seite 26

27 Other project with Creos (customer in Luxemburg) and Alcatel Lucent network In operation Seite 27

28 Agenda Existing and future configurations Requirements for the differential protection Trial with a four terminal topology Step by step commissioning Results of a few tests Summary Seite 28

29 Summary Packet oriented IP/MPLS-networks are suitable for the transmission of time critical data of the differential protection and also for teleprotection Detailed planning and configuration of Pseudo Wire connections is required (e.g. QoS Quality of Service for the links; VLAN-setting..) Use of existing differential protection devices through E1 interface with a converter or IEEE C37.94 interface (tested in another pilot project) In future direct connection with optical Ethernet interfaces to routers The pilot project is running in the test room of TenneT in Bayreuth and is under remote observation. Tests for further optimization done in July 2013 Project with Creos/Alcatel-Lucent in Luxemburg operates since 11/2012 Seite 29

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