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EVALUATION OF ENERGY STRESS ON LINE ARRESTERS

I. Uglešić ; Faculty of Electrical Engineering and Computing University of Zagreb (Croatia)
V. Milardić ; Faculty of Electrical Engineering and Computing University of Zagreb (Croatia)
B. Filipović-Grčić ; Faculty of Electrical Engineering and Computing University of Zagreb (Croatia)
A. Tokić ; Faculty of Electrical Engineering University of Tuzla (Bosnia and Herzegovina)

Sažetak

Line Surge Arresters (LSAs) are efficient means for the improvement of the lightning performance of
transmission lines. Determination of optimal LSA number, location and rating is important for the
improvement of the reliability and availability of a transmission system. In selection of the LSA
special attention should be paid to their energy stress which depends on complex interactions between
the arrester locations, grounding, shielding and the local lightning environment. LSAs experience
higher energy stress compared to station arresters, because the incoming surge to a station is limited
by insulator flashover on the transmission line and impulse corona.
In this paper calculations of energy stresses were carried out for a double-circuit 220 kV line with a
single shielding wire. Parametric studies were conducted in which arrester discharge energy was a
function of: time to half value of stroke current, number of towers with arresters, footing resistance,
span length and angle of power frequency voltage. Arrester energy stress is analyzed in case of stroke
to tower and shielding failure. From conducted analysis it can be concluded that energy stress on
LSAs is lower for shorter span lengths. Tower footing resistance has only minor effect on the
discharge energy. Arrester discharge energy strongly depends on time to half of the stroke current,
number of towers with installed arresters and angle of power frequency voltage.

Ključne riječi

Line surge arrester; modelling; energy stress calculations; double-circuit line; parametric analysis; ATP-EMTP simulations

Hrčak ID:

198496

URI

https://hrcak.srce.hr/198496

Datum izdavanja:

20.6.2017.

Posjeta: 451 *