Izvorni znanstveni članak

Calculations of lightning-induced voltages in distribution lines with LSA

P.E. Munhoz Rojas ; LACTEC, Brasil
C.L. da S. Pinto ; COPEL-DIS, Brasil

Sažetak

In this paper the results of the calculation of the effect of the surge arresters, placed in one of
the conductors of a distribution line, are shown.
The calculations were made using a new computer program, written in MatLab environment,
which is based in a new coupling model in order to take into account the presence of a lossy
ground under the line. Other important feature of the new program is that, after a discretization
only in space, the resulting system of ordinary differential equations (ODE) is solved using the
powerful ODE solvers actually existing.
It is shown that a surge arrester protects the points behind it (seen from the strike point of the lightning
discharge), but, it will only protect the points in front of it within a certain "effective distance", which
depends on the risetime of the induced voltages.
It is also shown that, in general, the line span in front of the strike location is not protected, and, the
protection afforded to the line span in front of the strike location, when it exists, is dependent on the
risetime of the induced voltages.

Ključne riječi

Surge arresters; induced voltages; lightning protection; modeling

Hrčak ID:

198509

URI

https://hrcak.srce.hr/198509

Datum izdavanja:

20.6.2017.

Posjeta: 368 *