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FOX615/612 TEGO1 IEC 61850 GOOSE Proxy Gateway interface module.

—FOX615/612 multiplexing platform.Enabling GOOSE messaging thanks to TEGO1 interface card.

For substation automation systems, the IEC 61850 standard has been widely accepted. With the ongoing digitalization of electrical substations, GOOSE based line distance protection application becomes a greater focus.

The same standard provides defined messaging for IEC 61850 signal exchange between IEDs with different protocols. For binary signals such as trip signals, GOOSE (Generic Object oriented substation events) messaging has been defined. The TEGO1 interface card of the FOX615/612 multiplexing platform now offers an integrated IEC 61850 GOOSE interface being able to connect directly to the IEC 61850 station bus of an electrical substation. This interface allows to use GOOSE messages for line distance protection or for new applications such as remote trip or interlocking.

The traditional way of line distance protection application is using binary high voltage contacts, either to the teleprotection interface of the multiplexing platform itself or to the externalteleprotection equipment. This remained as such even if today’s IEC 61850 framework would allow the usage of GOOSE based trip signals for line distance protection applications.

This traditional approach brings certain complexity to the protection system since electrical high voltage signals have to be brought

from the relay to the communication equipment.EMC/ EMI aspects have to be considered as well as substantial cabling efforts since per command two cables have to be connected and usual protection schemes consist of severalcommands per powerline. Availability is limited since redundancy of cabling, as well as supervision of end to end solution is often not ensured. Last but not least the performance of the overall protection solution is restricted by the speed of the binary contacts with it's relatively slow switchover times leading to longer fault clearing times than necessary. The ongoing trend for digital substations with it’s undoubted benefits on visibility and flexibility makes the usage of GOOSE based line distance protection applications obvious, if the same can provide therequired performance parameters such as dependability and security defined in IEC 60834-1 standard as well as provide a secure access from the WAN to the substation IEC 61850 station bus.

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Avoiding reconfiguration of existing IEC 61850 substation configurations.IEC 61850 has been used for substation automation for many years. It originated as a technology that was only applicable for internal substation purposes. Only with recent developments such as IEC TR 61850-90-1 GOOSE has been considered for substation to substation protection signal transmission.

Three main problems arise when IEC 61850 GOOSE messages are used for inter substation communication.

01GOOSE is a layer 2 protocol, direct connection between substations would mean connection of the two so far separated station buses with all related problems arising when different local area networks are connected on L2 basis only.

02When IEC 61850 based substations were introduced, the concept of using GOOSE messages for communication between substations was not considered. Due to this, there has usually not been a country wide planning on IP addresses of IED’s, application IDs or used VLANs. Changing this at a later stage would be a major effort related with (at least) a partial reconfiguration of the substation.

03Since GOOSE messages are based on Ethernet packets, and the station bus is based on an Ethernet Switched network cyber security aspects such as data integrity and access restrictions need to be considered, and this in the light of critical applications with strong real time requirements

TEGO1 has been developed to specifically address these issues. TEGO1 provides:• A fast L2 tunnel for GOOSE messages with

specific filtering in order to avoid the L2 network problems and flooding of all information to all sites. Staying on L2 ensures the highest possible performance for critical GOOSE signals.

• The translation functionality for GOOSE fields like VLAN and Multicast address or application ID in order to resolve potential conflicts when using GOOSE between substations hence avoiding reconfiguration of already commissioned substations when GOOSE is used for line distance protection applications.

• Filtering and translation happens at wire speed which results in a TEGO1 being as fast as a transparent L2 tunnel between substation with the flexibility of a proxy-gateway being able to change related GOOSE fields.

• L2 application based firewall functionality to restrict access to the station bus from the wide area network

• Authentication of GOOSE messages for man in the middle attack and replay protection

TEGO1 is an IED acting as a proxy gateway forGOOSE signals between substations. TEGO1 represents the remote IED inside the localsubstation and resolves at the same time allpotential conflicts by performing requiredtranslation functions at wire speed. With this, an IED cannot distinguish if the IED is just connected to the local station bus or if it is hundreds of kilometers away on the other side of the power line. By representing the remote IED all of the standard IED 61850 functionality is performed such as subscription to GOOSE messages or status supervision of the local IEC 61850 substation automation system using MMS. In order to allow this, TEGO1 is integrated into the local SCD file and configured there initially. This is done at both sides and brought together in the TEGO1 configuration tool, where the mapping between the different substations is completed. In order to finalize the configuration, updates of the different substation SCD files need to be performed.

—GOOSE Signal Translation.TEGO1 forms part of the IEC 61850 world.

I NTR O D U C TI O N 32

01

—01 TraditionalSubstation designwith contact basedTeleprotection

—02 Digital Substation design using GOOSE for line protection

— Digital Substation with GOOSE for line distance protection.The benefits for IEC 61850 substation design.

By using IEC 61850-based protection various

benefits arise:• Easier setup of the protection system by

using one technology resulting in overall better protection performance (faster protection system).

Figure 1 shows a conventional setup of a linedistance protection application. The distanceprotection relay (21) is connected with multiplecables to the teleprotection interface on themultiplexer (or to a dedicated teleprotectionequipment). All those connections are replaced bya single fiber connection as indicated in Figure 2.

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IEC 61870-5-104 DNP3

Relay (21)

Relay (21)

Relay (21)

Station Bus

Multiplexer

WAN

Substation Control System

RTU

110 VCD TRIP

110 VCD TRIP

110 VCD TRIP

FOX 615

4

02

IEC 61870-5-104 DNP3

WAN

MMS GOOSE SNTP

Substation Control System

RTU

Relay (21)

Relay (21)

Relay (21)

Station Bus

• A reduction in cabling due to less additional copper cables being required for trip signals.

• Less EMC/ EMI and safety problems by using fiber optic communication media.

• Increased flexibility since new or modified protection schemes can be implemented by software modification only.

• Better visibility and supervision of the solution by integrating the solution in the communication network management system as well as the substation automation system.

• Increased availability of protection system.

TH E B EN EFITS O F USI N G I EC 61 8 5 0

Multiplexer

FOX 615

5

TEGO1 forms part of the IEC 61850 world. It represents the remote IED in the local substation.

TEGO1 key features.• 4 x FE/ GbE interfaces (SFP based for direct

connection with the station bus of IEC 61850 substations.

• Representation of remote IED for inter substation IEC 61850 GOOSE signal transmission.

• Filtering capabilities for GOOSE messages.• Translation capabilities of GOOSE messages

to resolve potential addressing/naming conflicts between substations.

• Redbox functionality for connection to PRP• Redundant station bus (one card/two card

solution).• L2 firewall for access restriction from the WAN

to the substation station bus.• Hitless redundancy for GOOSE protection

communication channels.

• Guaranteed data integrity thanks to authentication of data streams.

• 6 electrical IRIG-B outputs for synchronization of end devices to GPS Grandmaster clock.

• Optical IRIG-B output for synchronization of end devices to GPS Grandmaster clock.

• SNTP master functionality for providing time of day information to IEDs.

• SNTP client functionality for full IEC 61850 compliance.

• MMS status reporting to substation automation system for full IEC 61850 compliance.

• Enhanced traffic supervision features providing full visibility of the communication channel performance.

• Full integration in FOXMAN-UN network management system and FOXCST configuration tool.

• Providing all optical interconnections from relay to relay through multiplexer without any converter boxes.

—03 TEGO1 is capable to server various remote ends.

TH E B EN EFITS O F I EC 61 8 5 0

— The benefits of using IEC 61850-based line distance protection application.Innovative line protection schemes beyond todays limits.

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03

Substation A TEGO1 IED

Substation B

Substation C

Substation D

Substation E

Substation F

(PRP red.) Station Bus

6 7

—FOX 615 TEGO 1SCL Configuration Mode - Simplified Workflow

ICD FileIED Capability Description

SCD FileSubstation Configuration Description

IID FileInstantiated IED Description

SCD FileSubstation Configuration Description

Step 1: Initial substation design

Step 2: Initial TEGO1 configuration

Step 3: Final substation design

Step 4. Final TEGO1 configuration

INPUT TOOL ACTION

IEC 61850 Configuration Tool(e.g. IET600)

Initial local substationconfiguration with TEGO1

TEGO1Engineering Tool

Definition of which GOOSE messageis sent to which remote end

IEC 61850 Configuration Tool(e.g. IET600)

Update of local substation configurationon GOOSE messages received (finalinterconnected substation configuration)

TEGO1Engineering Tool

Import of TEGO1 configurationinto FOX615

8

Simple time of day distribution. Time of day information is important for many electrical grid operation applicaitons. Fault recorders, event recorders, differential protection relays and also wide area protection schemes using synchrophasors rely on it for correct operation or for statistical analysis at a later stage.

FOX615 can be synchronized from a centralized grandmaster clock by using IEEE 1588v2 PTP protocol as well as Synchronous Ethernet. The accuracy of this time of day information is < 1 us. This allows distributing the time of day information through the WAN to substations and end devices.

Redundancy and security - TEGO1 increases the availability and security of your protection solution. TEGO1 provides the possibility to connect to a PRP redundant station bus architecture and acts as a redbox. In order to ensure redundancy in the WAN communication TEGO1 provides hitless redundancy for critical GOOSE signal transmission. In case of problems in the WAN, where one of the redundant communication channel fails, the hitless redundancy ensures that the protection application is not affected at all.

In order to detect cyber security incidents, such as signal modification or replay attacks, TEGO1 allows an authentication of critical protection data. For security of the station bus infrastructure a L2 firewall working on white listing principle is implemented. With this, all unauthorized accessfrom the WAN to the station bus can be stopped. The solution works on a denial per default principle while the performance of the protection application is not compromised.

—04 Time of day distribution to end devices.

—05 FOX615 as a redbox for PRP station bus.

04 05

FOX615

1+1 hitless protection

WAN

REC650 REC650

IRIG-B

SNTP

PTP

— Further benefits of TEGO1Redundancy, Security and Improved operations.

PRP Redundant Station Bus

9FU RTH ER B EN EFITSFOX61 5/61 2 TEG O1 I EC 61 8 5 0 G O O S E G ATE WAY I NTER FACE M O D U L E

Feature Rating or standard

General

Amount of Ports 4 SFP front ports, FE/ GbE

Port configuration mode Individual or PRP redundant

RedundancyWANLAN (Station bus)

Hitless 1+1 (0 ms)PRP redbox

Gateway IED for GOOSE between substations

IEC 61850

Trip counters 4 per instance

Event recorder User Events and GOOSE events

Performance <200 us transmission time back to back

Functionality

Filter criteria for GOOSE Subscription to GOOSE message

Amount of GOOSE messages per card

up to 32 GOOSE messages

Amount of instances up to 8

Translation of GOOSE fields

MAC DA (Destination Address)APPID (IEC 61850 Application ID)VLAN TaggoCBRef (Goose control block reference)datset (data set)goID (Goose ID)

TEGO1 status supervision Integrated in FOXMAN-UNMMS message for substation automation control system

AuthenticationL2 firewall

White listing, filtering on LAN and authentication on WAN

WAN performance supervision

Latency, availability, packet loss, BER, 15 min/ 24h, continuous supervision

WAN performance Dependability/ Security as per IEC 60834-1

Synchronisation

SNTP Master/ Slave

Supported serial time code formats

IRIG-B002,5,6 (100pps, pulse with code, no carrier, BCD)

IRIG-B output 6 electrical outputs IRIG-B002, 1 optical output

Environment

Temperature rating -25°C – +60°C

Fanless -25°C - +55°C

EMC standards Generic: EN 61000-6-3, EN 61000-6-2;Specific: IEC 61000-4-2 / 3 / 4 / 5 / 6 / 8 / 16 / 18 / 29

Product standards IEC 61850, IEEE 1613, IEC60834-1

Electrical safety EN 60950-1

Electrical isolation IEC 60255-5

MTBF 100 years

List of abbreviations

FOXCST Configuration Tool for FOX615/612

SNTP Simple Network Timing Protocol

IED Intelligent Electronic devices

PRP Parallel Redundancy Protocol

BER Bit Error Rate

WAN Wide Area Network

LAN Local Area Network

MMS Manufacturing Messaging Specification

SFP Small Form Factor Pluggable

—Network Management System.

—Technical Data.

Network Management system.All modules of FOX615, including a variety of services and applications, are managed centrally by FOXMAN management system, the network management system for the complete communications portfolio. Easy and intuitive configuration of user dialogues and equipment views is ensured by FOXCST, the graphical configuration tool. TEGO1 offers a special configuration tool for IEC 61850 configuration where SCD files from the substations can be imported,

TEGO1 IEC 61850 configuration be done and required modification of SCD file exported again to the substation automation system, as well as to the FOXCST. With FOXMAN and FOXCST utilities can enhance the overall performance of their operational networks, saving costs and accelerating the circuit provisioning process with only one element manager for all service types.

FU RTH ER B EN EFITS 10

—"ABB's GOOSE Proxy Gateway interface module TEGO1 takes innovative line distance protection schemes beyond todays limits."

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