POWER transmission, ELECTRONIC equipment, ELECTRIC circuits, ENGINEERING, ELECTRICAL engineering
Abstract
In Japan during the 20th century, developments of high voltage transmission and distribution apparatus advanced tremendously and circuit breakers were the center of these developments. And as a result, 1100 kV SF6 gas insulated switchgear (GIS) for ac transmission systems and also 500 kV dc GIS for dc transmission systems have become available. Vacuum circuit breakers (VCBs) have also been actively developed and a 168 kV two break VCB and 100 kA VCB are already available. This paper describes these developments and future trends in technology. [ABSTRACT FROM AUTHOR]
Izykowski, Jan, Molag, Rafal, Rosolowski, Eugeniusz, and Saha, Murari Mohan
Subjects
POWER transmission, ELECTRIC fault location, ELECTRIC circuits, ELECTRICAL engineering, ENGINEERING
Abstract
This paper presents a new algorithm for locating faults on two-terminal power transmission lines. Unsynchronized two-end voltages and currents are processed for determining the sought distance to fault and the synchronization angle. The calculations are performed initially for the lumped model of a transmission line. Then, these results are used as the initial data for the Newton-Raphson method-based iterative calculations, in which the distributed parameter line model is utilized. The delivered fault location algorithm has been tested and evaluated with the fault data obtained from versatile ATP-EMTP simulations. The sample results of the evaluation are reported and discussed. [ABSTRACT FROM AUTHOR]