ABB advances utility communication technology to further enhance the benefits of the Digital Substation

2017-08-04 - Flagship fiber optic multiplexer FOX615 capabilities further expanded to enable 5 ms faster IEC 61850 GOOSE based line protection

We are pleased to announce the launch of the latest FOX615 interface module TEGO1. The interface module now further extends the capabilities of the FOX615/612 multiplexing platform to enable IEC 61850 GOOSE based line protection. With the ongoing digitalization of electrical substations, the GOOSE based line distance protection application brings significant advantages to our customers and further strengthens our digital substation offering.

ABB's FOX615, is an outstanding multi-service multiplexer which enables the extension of existing communication infrastructure, as well as the smooth migration to future technology. FOX615 integrates teleprotection interfaces for distance as well as for differential protection simultaneously within state-of-the-art SDH networks and MPLS-TP networks; ensuring an easy and flexible way to migrate technology in a utility network. With its latest IEC 61850 interface, TEGO1, the FOX615 can now also act as a substation IED and enables GOOSE based line distance protection applications of digital substations

The new TEGO1 IEC 61850 GOOSE gateway interface module will also enable:-

  • A significant performance increase of typically 5ms for protection systems using GOOSE based Teleprotection. This ensures a significant improvement in the application of line distance protection.
  • A significant reduction in installation time and the level of cabling complexity. All copper cables are replaced by fiber optics, helping to provide a safer working environment for those who manage and maintain communication equipment within a substation.
  • Reduced hardware requirements in the substation thanks to its ability to include up to eight remote IED’s per TEGO1 with up to 32 GOOSE commands.
  • Compared to conventional solutions, TEGO1 will also help to increase availability by supporting fully redundant solutions (PRP redundancy) and hence remove presently seen single point of failures
  • The translation capabilities of TEGO1 enable an easy and fast introduction of GOOSE based line protection since major reconfiguration on existing substations can be avoided

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 external teleprotection 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.

Fig 1

This traditional approach (fig 1) 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 several commands per powerline. Availability is limited since redundancy of cabling, as well as supervision of 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 the required 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.

Fig 2

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

By using IEC 61850-based protection (fig 2) various benefits arise:

  • Easier setup of the protection system by using one technology resulting in overall better protection performance (faster protection system).
  • 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.

Further benefits of TEGO1
Redundancy, Security and Improved operations.

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 access from 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.

Technical Data

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