b5 2014线电流差动保护基于以太网广域通信时代.pdfVIP

21, rue d’Artois, F-75008 PARIS B5-101 CIGRE 2014 http : // Line current differential protection and of Ethe -based wide-area communications B. KASZTENNY*, B. LE, K. FODERO, and V. SKENDZIC Schweitzer Engineering Laboratories, . Canada SUMMARY This paper discusses multiterminal line current differential (87L) protection using Ethe for phase current data exchange. Nontraditional energy sources, such as wind and solar farms, are being added to the electric grid in reasing numbers, often by tap directly to transmission lines for convenience and cost reduction. Also, loads can be served via distribution stations directly tapped to transmission lines as the demand grows along the rights of way of the lines. As a result, an reasing number of power lines are becoming multiterminal lines. These lines create protection challenges for traditional impedance- and current-based schemes, but can be effectively protected by 87L schemes. An 87L scheme requires current data exchange and alignment among all relays creating the protection zone. In multiterminal applications, data exchange using traditional point-to-point channels requires a large number of channels in order to connect each relay in the scheme with all the other relays or it requires a token-ring type of architecture, slowing down the response time of the scheme. Ethe is a convenient way to provide this o-many and many-to-one data exchange. At the same time, generic Ethe , especially in intersubstation applications, is not necessarily consi