TVA Bradley substation now in service

Raleigh, NC, July 22, 2008 — The Tennessee Valley Authority (TVA) inaugurated its Bradley Substation, an IEC 61850-compliant substation where all of the available features promised by the communications standard were implemented and proved to work in a 500 kilovolt (kV) transmission substation, said the TVA.

Siemens provided SIPROTEC protective relays and SICAM PAS substation automation hardware and software. The Siemens configuration software, DIGSI, set the early standards and was the first commercially available IEC 61850 configuration tool.

The security features of the SIPROTEC relays include the ability to ensure that only authorized IEC 61850 clients can access the relays on this very secure network.

TVA accomplished the following goals that were set out for the Bradley Substation: Use the IEC 61850 standards to reduce the number of wires, components and connections in a substation protection control house design; use the interoperability features between vendors to further reduce wiring connections and retain the benefit of having redundancy without a single mode failure problem; and reduce the costly cabling and wiring between the switchyard breakers and the control house.

The watchdog program in the SIPROTEC relays detected missing information caused by issues in the fiber installations and detected problems in the settings of communication switches that did not filter circulating telegrams from the system. It provides essential information of the health of the wiring connections now done through generic object oriented substation event (GOOSE) messaging on the communication network.

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