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US 4,513,208 AGranted
Electrical switchgear
AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorIsao Kamata
Life of this patent
Estimating the term…
Abstract
An electrical switchgear having a position detector that detects the state of actuation of switch contacts and a position detector which judges the locking engagement condition of the switch contacts, wherein these position detectors are connected with an optical control unit by an optical cable.
Claims5
An electrical switchgear which comprises:
- fixed and movable contacts arranged in a tank filled with insulating gas;
- a switch mechanism driving said movable contact, and including a mainshaft;
- an operating unit connected to said main shaft of said switch mechanism;
- a first position detector means for optically detecting the operating state of said movable contact;
- an optical control unit being connected to said first detector by means of an optical cable, said optical control unit outputting a signal to said operating unit for controlling said switch mechanism.
2 more elements
An electrical switchgear which comprises:
- fixed and movable contacts arranged in a tank filled with insulating gas;
- a switch mechanism driving said movable contact and including a main shaft;
- an operating unit connected to said main shaft of said switch mechanism;
- a first position detector means for optically detecting the operating state of said movable contact;
- a second position detector means for optically detecting the possibility of the manual operation of said movable contact;
- an optical control unit being connected with said first and second detector by means of an optical cable, said optical control unit outputting a signal to said operating unit for controlling said switch mechanism.
3 more elements
An electrical switchgear which comprises:
- fixed and movable contacts arranged in a tank filled with insulating gas;
- a switch mechanism driving said movable contact and including a main shaft;
- an operating unit connected to said main shaft of said switch mechanism;
- a first position detector means for optically detecting the operating state of said movable contact;
- a second detector means for detecting optically the pressure of said insulating gas in said tank;
- a third detector means for detecting optically the pressure of an accumulator in said operating unit;
- an optical control unit being connected with said first, second and third detectors by means of an optical cable, said optical control unit outputting a signal to said operating unit for controlling said switch mechanism.
4 more elements
Dependencies are inferred from the claim text.