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US 7,679,023 B2Granted
Switchgear
AssigneeHitachi, Ltd.
InventorsTakashi Sato, Ayumu Morita, Masato Kobayashi, Satoru Kajiwara
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AssigneeHitachi, Ltd.
InventorsTakashi Sato, Ayumu Morita, Masato Kobayashi, Satoru Kajiwara
Estimating the term…
A switchgear having interrupters wherein at least two moving contacts are capable of being open and close with respect to respective fixed contacts. The switchgear comprises a non-earthed metal vacuum chamber enclosing the interrupters therein, a connection conductor for connecting the moving contacts, an operating rod connected to the connecting conductor by means of an insulator and protruding from the non-earthed metal vacuum chamber, a sealing means for sealing the protrusion of the operating rod at the non-earthed metal vacuum chamber, circuit terminals protruding from the non-earthed vacuum chamber, an earth layer surrounding an outer periphery of the insulating mold, and a potential control means. The control means for controlling the potential of the non-earthed metal vacuum chamber is connected between the circuit terminals and is connected to the non-earthed metal vacuum chamber at the intermediate point of the potential control means.
A switchgear having interrupters wherein at least two moving contacts are capable of being opened and closed with respect to respective fixed contacts, which comprises a non-earthed metal vacuum chamber enclosing the interrupters therein, a connection conductor for connecting the moving contacts, an operating rod connected to the connecting conductor by means of an insulator and protruding from the non-earthed metal vacuum chamber, a sealing means for sealing the protrusion of the operating rod at the non-earthed metal vacuum chamber, circuit terminals protruding from the non-earthed metal vacuum chamber, an insulating mold covering an outer periphery of the non-earthed metal vacuum chamber, an earth layer surrounding an outer periphery of the insulating mold, and a first potential control means, connected to an intermediate point between one of the circuit terminals and the non-earthed metal vacuum chamber, for controlling the potential of the non-earthed metal vacuum chamber.
Dependencies are inferred from the claim text.