Title :
Current differential relaying coping with communications channel asymmetry
Author :
Brunello, Gustavo ; Premerlani, Bill ; Voloh, Ilia
Author_Institution :
GE Power Manage., Canada
Abstract :
This paper describes a GPS based mechanism to guarantee reliable operation of current differential relays under channel asymmetry conditions. Topics discussed in the paper include: 1) types of digital communication used for line differential relays: direct optic fiber, multiplexers and Sonet/SDH communications systems, 2) relay clock synchronization when the communication channel is symmetrical, 3) the use of GPS time signal for sample synchronization during asymmetrical communication conditions , 4) fallback strategies for line differential relays under GPS/ communications contingencies.
Keywords :
Global Positioning System; SONET; digital communication; optical fibre communication; power system relaying; power transmission reliability; synchronous digital hierarchy; telecommunication channels; GPS time signal; Sonet/SDH communications systems; asymmetrical communication conditions; communications channel asymmetry; current differential relaying; digital communication; fallback strategies; line differential relays; multiplexers; optic fiber; relay clock synchronization; Clocks; Communication channels; Digital communication; Digital relays; High speed optical techniques; Multiplexing; Optical fibers; Protection; Protective relaying; Synchronization;
Conference_Titel :
Transmission and Distribution Conference and Exposition, 2003 IEEE PES
Print_ISBN :
0-7803-8110-6
DOI :
10.1109/TDC.2003.1335242
