Abrégé

[Problem] To provide a spark gap arrester having an enclosed structure in which: arc extinguishing performance is enhanced by generating sufficient arc extinguishing gas during the generation of electrical discharge and causing an arc resulting from lightning surge current to move in a reliable manner within an arc extinguishing plate; and in which melting and evaporation of the arc extinguishing plate that are caused by lightning surge current are reduced so as to increase the use life of the spark gap arrester. [Solution] A spark gap arrester in which a plurality of arc-extinguishing metal plates are arranged with a predetermined interval therebetween, said arc-extinguishing metal plates being formed from a conductive sintered alloy configured by mixing and sintering one or more metals having a high melting point with one or more metals having a low melting point between a pair of discharge electrodes. The discharge electrodes are arranged so as to face one another with an interval therebetween inside a cylindrical metal case, and form a circular truncated cone or a round pillar shape.

Classes IPC  ?

• H01T 4/12 - Limiteurs de surtension utilisant des éclateurs ayant un intervalle simple ou plusieurs intervalles disposés en parallèle scellés hermétiquement
• H01T 1/02 - Moyens d'extinction d'arc

Abrégé

[Problem] To provide a spark gap arrester having an enclosed structure in which: arc extinguishing performance is enhanced by generating sufficient arc extinguishing gas during the generation of electrical discharge and causing an arc resulting from lightning surge current to move in a reliable manner within an arc extinguishing plate; and in which melting and evaporation of the arc extinguishing plate that are caused by lightning surge current are reduced so as to increase the use life of the spark gap arrester. [Solution] An insulating discharge cap comprising a composite body of an insulating resin that generates arc extinguishing gas when heated and a conductive resin that generates arc extinguishing gas in a similar manner when heated are arranged between a pair of discharge electrodes. The discharge electrodes are arranged so as to face one another with an interval therebetween inside a cylindrical metal case, and form a circular truncated cone or round pillar shape. A plurality of arc-extinguishing metal plates are arranged with a predetermined interval therebetween on the outer surface of the insulating discharge cap, said arc-extinguishing metal plates being formed from a conductive sintered alloy configured by mixing and sintering one or more metals having a high melting point with one or more metals having a low melting point.

Classes IPC  ?

• H01T 4/12 - Limiteurs de surtension utilisant des éclateurs ayant un intervalle simple ou plusieurs intervalles disposés en parallèle scellés hermétiquement
• H01T 1/02 - Moyens d'extinction d'arc

Abrégé

Provided is a system event logging system for recoding a log of system events which relate to a process being monitored, the logging system having the aim of selectively recording system events that are necessary for purposes such as the reproduction of operations and excluding system events that are outside the intended purpose. Flag conditions and flag operation instructions are provided for each of the filters in a filter list (702), and the system event logging system uses the flag conditions as the conditions for applying the filters. When applying the filters, the logging system operates the flags according to the flag operation instructions. Thus, interrelated operation between the filters can be achieved by means of the flags, and also, interrelated operation can be achieved by means of the flags even between the processes performed for the system events.

Classes IPC  ?

• G06F 11/30 - Surveillance du fonctionnement
• G06F 11/34 - Enregistrement ou évaluation statistique de l'activité du calculateur, p. ex. des interruptions ou des opérations d'entrée–sortie