Medium voltage motor control center load discharge device
First Claim
1. An apparatus for electrically earthing a load-side conductor in a controller, said apparatus comprising:
- a base;
a lug electrically connected to said load-side conductor and fixedly attached to said base;
an earthing bar adapted to contact said lug and provide a ground path from said lug, said earthing bar adapted to move between a charged position and an earthed position;
a ground connection electrically connected to said earthing bar and adapted to earth said earthing bar;
a spring having a first end and a second end, said first end engaging said earthing bar and said second end engaging said base, said spring providing a motive force for moving said earthing bar from said charged position to said earthed position;
a charging mechanism for compressing said spring and moving said earthing bar from said earthed position to said charged position;
an actuating mechanism for releasing said spring and causing said earthing bar to move from said charged position to said earthed position; and
an operator for tripping said actuating mechanism.
1 Assignment
0 Petitions
Accused Products
Abstract
A medium voltage controller for electrical equipment, such as motors, transformers, reactors, and capacitors, having an arc resistant cabinet, swaged internal electrical connections, a one-piece self-aligning withdrawable finger cluster, a pull-out instrument compartment, a load discharge device, cast fuse holders, disconnect switch, a switch illuminator, low power current transformers, and an optical temperature measuring system. The load discharge device is compact and provides fast earthing of the load-side cables. The device has a scissors-type linkage and is charged by compressing at least one spring. The scissors-linkage, when in an almost-straight-line alignment, holds the compressed springs. An actuator moves one member of the scissors-linkage, thereby removing the holding alignment of the scissors-linkage. The springs move an earthing bar at high acceleration to ground the line-side cables.
8 Citations
18 Claims
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1. An apparatus for electrically earthing a load-side conductor in a controller, said apparatus comprising:
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a base;
a lug electrically connected to said load-side conductor and fixedly attached to said base;
an earthing bar adapted to contact said lug and provide a ground path from said lug, said earthing bar adapted to move between a charged position and an earthed position;
a ground connection electrically connected to said earthing bar and adapted to earth said earthing bar;
a spring having a first end and a second end, said first end engaging said earthing bar and said second end engaging said base, said spring providing a motive force for moving said earthing bar from said charged position to said earthed position;
a charging mechanism for compressing said spring and moving said earthing bar from said earthed position to said charged position;
an actuating mechanism for releasing said spring and causing said earthing bar to move from said charged position to said earthed position; and
an operator for tripping said actuating mechanism. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for electrically earthing a load-side conductor in a controller, said apparatus comprising:
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a base;
a lug electrically connected to said load-side conductor and fixedly attached to said base, said lug including a bevel;
an earthing bar adapted to contact said lug and provide a ground path from said lug, said earthing bar adapted to move between a charged position and an earthed position;
a ground connection electrically connected to said earthing bar and adapted to earth said earthing bar;
a spring having a first end and a second end, said first end engaging said earthing bar and said second end engaging said base, said spring providing a motive force for moving said earthing bar from said charged position to said earthed position;
a charging mechanism for compressing said spring and moving said earthing bar to said charged position;
an actuating mechanism for releasing said spring and causing said earthing bar to move to said earthed position; and
an operator for tripping said actuating mechanism.
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14. An apparatus for electrically earthing a load-side conductor in a controller, said apparatus comprising:
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an earthing member connected to ground, said earthing bar adapted to move between a charged position and an earthed position in which said load-side conductor is earthed;
a spring providing a motive force for moving said earthing bar from said charged position to said earthed position, wherein said spring is compressed in said charged position;
a sliding member fixedly attached to said earthing member;
a first member having a central pivot held in fixed spatial relation;
a second member having a first distal end connected to said first member at a first pivot and an opposite distal end connected to said sliding member at a second pivot; and
a third member defining a slot, said first pivot constrained to said slot;
whereby movement of said third member causes said first pivot to toggle between a first position corresponding to said charged position and a second position corresponding to said earthed position;
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15. An apparatus for electrically earthing a load-side conductor in a controller, said apparatus comprising:
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a means for electrically connecting said load-side conductor to a lug;
a means for earthing said lug;
a means for storing energy; and
a means for releasing said stored energy. - View Dependent Claims (16, 17, 18)
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Specification