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EP0237344A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Improvements in induction apparatus

Assignee: Gi International Co Ltd
•
Filing: 1987-03-11
•
Granted: —
•
Expires: 2007-03-11
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Abstract

Abstract Stationary inductive apparatus, especially an electrical transformer, comprises a core (11) surrounded by electrical windings (12) and contained within a tank (10) in which the windings are provided with a container (14) having an at least partially opened top to contain dielectric and coolant fluid; a fluid lift pump (15) is provided to raise liquid from the bottom of the tank to the container; and the tank is connected to an external condenser (18) located at a level above that of the windings so that coolant liquid vapour may pass from the tank to the condenser and, having condensed therein, be returned (under gravity) to the container (16) surrounding the windings.

Inventors

  • 👤 Harold Lloyd

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 06:07
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/08; H01F27/10; H01F27/18

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 107 words
Stationary inductive apparatus comprising a core (11) surrounded by electrical windings and contained within a tank (10) characterized in that the windings are provided with a container (14) having an at least partially open top to contain dielectric and coolant fluid; a fluid lift pump (15, 16) is provided to raise liquid from the bottom of the tank to the container; and the tank is connected to an external condenser located at a level above that of the windings so that coolant liquid vapour may pass from the tank to the condenser and, having condensed (18) therein, be returned (by gravity) to the container surrounding the winding.
Claim 2
Dependent Claim 107 words
Stationary inductive apparatus comprising a core (11) surrounded by electrical windings and contained within a tank (10) characterized in that the windings are provided with a container (14) having an at least partially open top to contain dielectric and coolant fluid; a fluid lift pump (15, 16) is provided to raise liquid from the bottom of the tank to the container; and the tank is connected to an external condenser located at a level above that of the windings so that coolant liquid vapour may pass from the tank to the condenser and, having condensed (18) therein, be returned (by gravity) to the container surrounding the winding.
Claim 3
Dependent Claim 20 words
Stationary inductive apparatus as claimed in claim 1 characterized in that it is in the form of an electrical transformer.
Claim 4
Dependent Claim 36 words
Stationary inductive apparatus as claimed in claim 1 or claim 2 characterized in that it has two or more fluid lift pumps in series to raise liquid from the bottom of the tank to the container.
Claim 5
Dependent Claim 27 words
Stationary inductive apparatus as claimed in any one of the preceding claims characterized in that the rising delivery pipe of any fluid lift pump is thermally insulated.
Claim 6
Dependent Claim 42 words
Stationary inductive apparatus as claimed in any one of the preceding claims characterized in that the tank and condenser form a sealed unit substantially filled with a condensible dielectric coolant or its vapour, the windings being substantially immersed in the coolant liquid.
Claim 7
Dependent Claim 28 words
Stationary inductive aparatus as claimed in claim 5 characterized in that up to 3% of the free space in the tank/condenser assembly is occupied by a non-condensible gas.

References Cited (Backward Citations)

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