P. MESTAS, M. C. TAVARES
Copyright © 2013 SciRes. EPE
1171
The representation of the transmission line ideally
transposed or with an actual transposition scheme affects
the results of overvoltages. In the case of three-phase
reclosing, this difference is influenced by the variation of
the line natural frequency and the compensation equip-
ment at the line side.
Regarding the overvoltages mitigation methods, the
use of ZnO surge-arresters with lower rated voltage (396
kV) instead of the surge arresters normally specified (420
kV) is an alternative to limit the overvoltages; however
the use of this method would be more appropriate in
combination with other control method.
For the three-phase reclosing of the studied system, the
controlled switching is an effective method to reduce the
overvoltages. It should be noted that using the proposed
method overvoltages are slightly lower than for the ex-
isting method, however, the proposed method has a great
advantage in reducing the reclosing time, thereby reduc-
ing the interruption time of power supply.
For the three-phase reclosing, the pre-insertion resistor
is not a method as effective for the overvoltage reduction
as in the case of energization, since the overvoltages can
be high if the reclosing occurs near the maximum of the
voltage beat between the circuit breaker contacts.
7. Acknowledgements
This work was supported by a grant from São Paulo Re-
search Foundation-FAPESP and CNPq, Brazil.
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