Electrical switchgear with synchronous control system and actuator
First Claim
1. A latching device used in an electrical switchgear, the latching device comprising:
- a shaft coupled to a contact of the switchgear and operable to move along a shaft axis between a first stable position in which an electrical path including the contact is closed and a second stable position in which an electrical path including the contact is open;
a piston operable to move along a piston axis;
a biasing device coupled to the piston to exert a biasing force on the piston along the piston axis; and
a linkage coupling the piston to the shaft;
wherein the linkage is configured such that the biasing force on the piston is transferred to the shaft to bias the shaft to one of the stable positions;
wherein the biasing device exerts a biasing force on the piston that is transferred to the shaft when the shaft is in each of the stable positions.
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Accused Products
Abstract
A closed loop feedback system controls electrical switchgear that moves at least one contact relative to another contact to switch power on and off in an AC electrical circuit. The control system includes a position feedback device that is operatively coupled to at least one of the two contacts to produce contact position information. A processor receives and analyzes the contact position information to control contact motion to provide AC waveform synchronized switching. The electrical switchgear may be a capacitor switch that includes a bi-stable over-toggle latching device. The latching device maintains the contacts in one of an open stable position in which electrical current does not flow through the contacts or a closed stable position in which electrical current flows through the contacts.
31 Citations
31 Claims
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1. A latching device used in an electrical switchgear, the latching device comprising:
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a shaft coupled to a contact of the switchgear and operable to move along a shaft axis between a first stable position in which an electrical path including the contact is closed and a second stable position in which an electrical path including the contact is open;
a piston operable to move along a piston axis;
a biasing device coupled to the piston to exert a biasing force on the piston along the piston axis; and
a linkage coupling the piston to the shaft;
wherein the linkage is configured such that the biasing force on the piston is transferred to the shaft to bias the shaft to one of the stable positions;
wherein the biasing device exerts a biasing force on the piston that is transferred to the shaft when the shaft is in each of the stable positions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A latching system used in an electrical switchgear, the latching system comprising:
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a shaft coupled to a contact of the switchgear and operable to move along a shaft axis between a first position in which an electrical path including the contact is closed and a second position in which an electrical path including the contact is open;
an actuator coupled to the shaft to cause the shaft to move along the shaft axis in response to an open or close command; and
a latch coupled to the shaft to maintain the first position as a stable equilibrium position and to maintain the second position as a stable equilibrium position, the latch comprising;
a piston operable to move along a piston axis;
a linkage coupling the piston to the shaft; and
a biasing device coupled to the piston to exert a biasing force on the piston along the piston axis, the biasing force being transferred to the shaft when the shaft is in each of the stable positions. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification