Spark gap device for a lightning arrestor
AssigneeTokyo Shibaura Electric Co., Ltd.
InventorsMinoru Murano, Satoru Yanabu, Susumu Nishiwaki, Soji Kojima, Teiichi Ueki
Life of this patent
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Abstract
Within an arc extinguishing chamber are disposed a pair of main electrodes so as to cause a spark starting gap to be defined therebetween. A single auxiliary electrode is also disposed so as to cause reignition in those interspaces between the auxiliary electrode and the respective main electrodes at positions distant from said spark starting gap. Further, paths for supplying therethrough a heated gas to the reigniting spark gaps when the feet at one side of the arcs between the respective main electrodes and the auxiliary electrode have arrived at the prescribed points of the auxiliary electrode are provided.
Claims12
A spark gap device for a lightning arrestor comprising an arc extinguishing chamber defined by arc extinguishing plates;
- a pair of main electrodes disposed within said arc extinguishing chamber to form a spark starting gap between facing surface portions thereof;
- an auxiliary electrode having a first surface facing said pair of main electrodes and a pair of second surface portions opposite to said first surface, said first surface forming a pair of reigniting spark gaps with respect to said main electrodes respectively at a first space portion between said first surface and said main electrodes, and said second surface portions each serving as a temporary arc foot point of an arc extended between said second surface portion and one of said main electrodes;
- said pair of second surface portions defining respective second space portions adjacent to said second surface portions and remote from said first space portion, and heated gas passing means for conducting heated gas between said second space portions and said first space portion and for causing reigniting sparks at said reigniting spark gap when the amount of each expanded arc current exceeds a predetermined value.
Dependencies are inferred from the claim text.