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US 5,543,597 AGranted
Grounding switch gear device
AssigneeHitachi, Ltd.
InventorsAtsuji Watanabe, Youichi Ohshita, Masatomo Ohno, Masanori Tsukushi, Shunji Tokuyama
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AssigneeHitachi, Ltd.
InventorsAtsuji Watanabe, Youichi Ohshita, Masatomo Ohno, Masanori Tsukushi, Shunji Tokuyama
Estimating the term…
A first puffer chamber is formed by a puffer cylinder having a substantially cylindrical flange portion and a shaft portion, and a fixedly disposed piston. The piston is formed in a cylindrical shape sealed with respect to an external space, and is constituted to be accommodated in the flange portion of the puffer cylinder at the circuit breaking position of the circuit breaking unit. The internal space of the piston is constituted as a second puffer chamber which is designed to communicate with the first puffer chamber. The gas accumulated in the second puffer chamber is continuously blown out toward between the electrodes, thereby prolonging an effective interruptable arc time span without increasing the size of the circuit interrupting unit and operating unit.
A grounding switch gear device including a pair of engageable and disengageable stationary and movable electrodes constituting a circuit breaking unit, a puffer cylinder having a substantially cylindrical flange portion and a shaft portion at the end of which said movable electrode is fixedly secured, and a hollow puffer piston slidably supported along the inner circumferential face of the flange portion of said puffer cylinder, said puffer cylinder and said puffer piston in combination constituting a first puffer chamber, wherein a gas in the first puffer chamber is compressed in association with separation of said movable electrode from said stationary electrode during a separating operation and is blown out between said movable and stationary electrodes,
A puffer type gas circuit breaker including a pair of engageable and disengageable stationary and movable electrodes constituting a circuit breaking unit, comprising a puffer cylinder carrying said movable electrode and a puffer piston slidably supported inside said puffer cylinder, said puffer cylinder and puffer piston in combination constituting a first puffer chamber containing a gas which is compressed when said movable electrode is disengaged from said stationary electrode and is blown between said movable and stationary electrodes,
A puffer type gas circuit breaker including a pair of engageable and disengageable stationary and movable electrodes constituting a circuit breaking unit, comprising a puffer cylinder carrying said movable electrode and a puffer piston slidably supported inside said puffer cylinder, said puffer cylinder and puffer piston in combination constituting a first puffer chamber containing a gas which is compressed when said movable electrode is disengaged from said stationary electrode and is blown between said movable and stationary electrodes, and further comprising a second puffer chamber formed on the other side of said puffer piston from said first puffer chamber in two-way communication with said first puffer chamber through an opening formed at said puffer piston and serving as a buffer space for said first puffer chamber during the separating operation, whereby the gas blasting time is prolonged at least for more than four cycles of the frequency of a power transmission line to which the puffer type gas circuit breaker is applied.
Dependencies are inferred from the claim text.