Fail-open mechanism for motorized switch
AssigneeSchlumberger Technology Corporation
InventorsOmid Ghoreishi, Jeffrey Lim, Obinna Ilochonwu, Adunola Ige
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Abstract
A fail-safe motorized switching system includes: (a) a motorized loadbreak switch system, the motorized loadbreak switch system adapted for opening and closing contacts between a high voltage power source and a load; (b) an energy storage device connected to the motorized loadbreak switch system; and (c) a controller connected to the energy storage device, the controller programmed with control logic to ensure that the motorized loadbreak switch system opens the contacts between the high voltage power source and the load once the power source is removed.
Claims10
A fail-safe motorized switching system, comprising:
- a motorized loadbreak switch system, the motorized loadbreak switch system adapted for opening and closing a contact between a high voltage power source and a load;
- an energy storage device connected to the motorized loadbreak switch system;
- and
- control circuitry comprising a switch and a coil, the switch having an open position and a closed position that causes a supply of energy from the energy storage device to the motorized loadbreak switch system for closing the contact, the coil having an energized state corresponding to the closed position of the switch and a de-energized state corresponding to either the open position of the switch or a loss of power supply from the power source, wherein when the coil is in a de-energized state the motorized loadbreak switch system opens the contact between the power source and the load.
A method for opening and closing contacts between a high voltage power source and a load, comprising the steps of:
- providing a motorized loadbreak switch system between the high voltage power source and the load;
- connecting an energy storage device to the motorized loadbreak switch system;
- and
- connecting circuitry to the motorized loadbreak switch system and to the energy storage device wherein the circuitry comprises a switch and a coil, the switch having an open position and a closed position that causes a supply of energy from the energy storage device to the motorized loadbreak switch system for closing the contact between the high voltage power source and the load, the coil having an energized state corresponding to the closed position of the switch and a de-energized state corresponding to either an absence of power from the high voltage power source or the open position of the switch, wherein when the coil is in a de-energized state the motorized loadbreak switch system opens the contact.
Dependencies are inferred from the claim text.