Switchgear
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsYukimori Kishida, Kenichi Koyama, Hiroyuki Sasao, Kazuhiko Nishimiya, Yuichi Yamaji, Toshimasa Maruyama
Life of this patent
Estimating the term…
Abstract
In a switchgear, by using a spring with a varying spring constant from closing to electrode opening as a loading spring, spring load in the opened electrode state is made smaller than a spring load in the closed electrode state to decrease the energy required from electrode closing up to electrode opening. Moreover, by using a spring in which a load in the opposite direction to a load in the closed electrode state works in the opened electrode state, the opened electrode state can be held securely.
Claims14
A switchgear comprising:
- pair of electrodes and a tripping and closing mechanism for opening and closing said electrodes, wherein said tripping and closing mechanism comprises:
- a movable electrode-closing repulsing section,
- a movable electrode-opening repulsing section,
- a stationary electrode closing-and-opening coil disposed between the electrode-closing repulsing section and the electrode-opening repulsing section for imparting a repulsive force to said electrode-closing and electrode-opening repulsing sections by generating eddy currents in said electrode-closing and electrode-opening repulsing sections,
- an electrode closing capacitor for supplying current to said electrode closing-and-opening coil when closing said electrodes,
- an electrode opening capacitor for supplying current to said electrode closing-and-opening coil when opening said electrodes, and
- a charging power supply for charging said electrode closing and opening capacitors.
A switchgear comprising a pair of electrodes and a tripping and closing mechanism for opening and closing said electrodes, wherein said tripping and closing mechanism comprises:
- a movable repulsing section,
- a stationary electrode closing coil and a stationary electrode opening coil disposed on opposite sides of the stationary repulsing section for imparting a repulsive force to said repulsing section by generating an eddy current in said repulsing section,
- a capacitor for supplying current to said electrode closing coil and said electrode opening coil,
- a charging power supply for charging said capacitor, and
- electrode-closing-and-opening change means for selectively changing electrode-opening and closing operations so that current can be supplied from said capacitor to said electrode closing coil or said electrode opening coil.
A switchgear comprising:
- a pair of electrodes and a tripping and closing mechanism for opening and closing said electrodes, wherein said tripping and closing mechanism comprises:
- a movable repulsing section;
- a stationary electrode closing coil and a stationary electrode opening coil for imparting a repulsive force to said repulsing section by generating an eddy current in said repulsing section,
- an electrode closing capacitor for supplying current to said electrode closing coil when closing said electrodes,
- an electrode opening capacitor for supplying current to said electrode opening coil when opening said electrodes, and
- a charging power supply for charging said electrode closing and opening capacitors.
Dependencies are inferred from the claim text.