No abstract

No abstract

The paper presents a new method to evaluate conductor ampacity which combines accuracy and rapidity. With the proposed model, the conductor temperature in a large number of lines can be evaluated in real-time using a computer and a centralized data acquisition system.Cette étude présente une nouvelle méthode combinant la précision et la rapidité pour évaluer la capacité en courant des conducteurs. Avec le modèle proposé, la température des conducteurs dans un grand nombre de lignes peut être évaluée en temps réel, à l'aide d'un ordinateur et d'un système centralisé de collecte des données. SummaryIn this paper a very fast and exact solution for the real-time overhead-line conductor ampacity evaluation is presented. For the first time a complete analytical solution for the on-line conductor thermal model described by a first order, non-linear differential equation is given, consequently putting in evidence three conductor operation zones: • normal and planned emergency operation zone, • very short time, high conductor overload zone, or the "gray zone", and • fault-current zone.These three zones are delimited by two "natural" conductor loads /i, ml and /ijm2, whose values depend on the conductor type and actual meteorological data. For the first two zones mentioned above, as well as for the singular points l^m\ and /ii m2 , analytical solutions for the steady-state conductor temperature and the time remaining are given.An equivalent conductor time constant is also defined, resulting in an accurate expression of exponential form for the conductor transient temperature response, following an overload. Results for a most widely referenced ACSR conductor are presented.

No abstract

No abstract