Sealed and cooled enclosure with voltage isolation
AssigneeE2V Technologies (UK) Limited
InventorRobert Richardson
Life of this patent
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Abstract
An enclosure (4) for electrical apparatus (6) has a sealable outlet (8) for partially evacuating the enclosure and a sealable inlet (9)for partially filling the enclosure with a liquid (7) having a vapor pressure at operating temperatures of the apparatus suitable to enhance electrical isolation of the electrical apparatus and suitable to provide convective cooling of the electrical apparatus. The vapor preferably provides a voltage hold-off sufficiently high for operating voltages of the electrical apparatus and has a relative permittivity sufficiently low to prevent stray capacitance in the electrical apparatus above a predetermined limit.
Claims21
An apparatus for enclosing an electrical apparatus comprising;
- a sealed enclosure adapted to house the electrical apparatus;
- a sealable outlet coupled to the enclosure and adapted to be coupled to an evacuating apparatus to remove air and water vapour from the enclosure;
- and
- a sealable inlet coupled to the enclosure and adapted to partially fill the enclosure with a liquid from an external reservoir, the liquid having a vapour pressure at operating temperatures of the electrical apparatus so that a saturated vapour from the liquid within the sealed enclosure enhances electrical isolation of the electrical apparatus and provides convective cooling of the electrical apparatus.
A method of enclosing electrical apparatus comprising the steps of:
- a. positioning the electrical apparatus in a hermetically sealable enclosure;
- b. baking the electrical apparatus and enclosure to remove moisture therefrom;
- c. removing air and water vapour from the enclosure;
- d. introducing a liquid into the enclosure to form a saturated vapour from the liquid within the enclosure;
- and
- e. hermetically sealing the enclosure, wherein the saturated vapour sealed in the enclosure enhances electrical isolation of the electrical apparatus and provides convective cooling of the electrical apparatus.
Dependencies are inferred from the claim text.