Measuring transformer for high-voltage switch-gear with metal encapsulation
AssigneeSiemens Aktiengesellschaft
InventorHeinz Schiemann
Life of this patent
Estimating the term…
Abstract
A measuring transformer for use with high-voltage switch-gear of a type which employs metal encapsulation. The transformer is retained between flanges at a joint of the metal encapsulation and includes a sealing and insulating spacing means. The latter forms a ring-shaped cavity with the flanges and seals such cavity from the interior of the metal encapsulation. In the ring-shaped cavity is disposed at least one iron core having a secondary winding placed thereon, the latter core together with the inner conductor of the high-voltage switch-gear forming a current transformer.
Claims13
A measuring transformer for use with a high voltage switch-gear having an inner conductor, metal encapsulation surrounding said inner conductor and forming an inner chamber, and outwardly extending flanges formed by said metal encapsulation at a joint thereof for retaining said transformer, comprising:
- means, including an insulating tube, forming sealing and insulating spacing means, said means being determinative of the spacing of said flanges from each other and forming with said flanges a ring-shaped cavity, outside said inner chamber, said means sealing off said inner chamber of said encapsulation;
- a first conductive layer on the side of said tube facing toward said inner conductor, said layer forming a capacitor with said inner conductor;
- a second conductive layer on the side of said tube facing away from said inner conductor, said second conductive layer forming a capacitor with said first conductive layer on the side of said tube facing toward said inner conductor;
- at least one iron core and a secondary winding disposed thereon, said core being disposed within said cavity and forming a current transformer with said inner conductor;
- and
- mean for rigidly coupling said sealing and insulating spacing means and said flanges, in a sealing manner.
A measuring transformer for use with a high-voltage switch-gear having an inner conductor, metal encapsulation surrounding said inner conductor and forming an inner chamber, and outwardly extending flanges formed by said meal encapsulation at a joint thereof for retaining said transformer, comprising:
- an insulating tube with end faces forming sealing and insulating spacing means, said insulating tube being determinative of the spacing of said flanges from each other and forming with said flanges an open ring-shaped cavity, outside said inner chamber, said insulating tube sealing off said inner chamber of said encapsulation;
- a conductive coating disposed on the surface of said tube facing toward said inner conductor, said coating forming a capacitor with said inner conductor, said coating insulated from said metal encapsulation, said capacitor acting as the high-voltage capacitor of a capacitive voltage divider;
- a first capacitor connected between said coating and said encapsulation, said first capacitor acting as the low-voltage capacitor of said voltage divider;
- an indicating device connected to said low-voltage capacitor;
- sealing rings disposed on the end face of said tube;
- at least one iron core and a secondary winding disposed thereon, said core being disposed within said cavity and forming a current transformer with said inner conductor;
- and
- means for rigidly coupling said sealing and insulating spacing means and said flanges, in a sealing manner.
Dependencies are inferred from the claim text.