PRESENT STATE AND TREND OF APPLICATION OF COMMUNICATION INCLUDING LAN TO PROTECTION AND SUBSTATION CONTROL

摘要

This paper introduces the two systems as the presentstate of application of communication within substation.One is the coordinated-type protection, control, andoperation support system employing the optical LANdeveloped based on the ISO/IEC 8802-4 (token passingbus) LAN with applying optical star couplers. Anotheris the remote control and monitoring system forprotection equipment employing the Ethernet LAN withTCP/IP.Furthermore, this paper introduces new substationautomation systems, which are presently considered byJapanese electric power companies for a further costdecrement, as examples showing the direction ofsubstations in future. The data transmission system hasbeen scrutinized from the aspects of general-purposeapplicability, economical efficiency, and functionalperformance while considering the requirements forprotection and control system, such as datatransmission speed and synchronized sampling.