Current-transformer for a metal-enclosed gas-insulated...

Details Current-transformer for a metal-enclosed gas-insulated... Current-transformer for a metal-enclosed gas-insulated...

G - Physics

01

R

G01R 19/00 (2006.01) G01R 15/18 (2006.01) H01F 27/36 (2006.01) H01F 38/30 (2006.01) H02M 5/12 (2006.01)

Patent

CA 2152891

This current transformer is provided, in particular, for a metal-enclosed gas-insulated high- voltage installation. It has a toroidally formed current sensor enclosing a current path and a signal processing system downstream of said sensor. The current sensor is surrounded by an electrically conducting screen which encloses an annular cavity filled with a compound (4). The screen is interrupted by a circumferential gap (9) designed as an interruption in the screen. It is intended to provide, for metal-enclosed gas-insulated high-voltage installations, a current transformer which is insensitive even to extremely high-frequency electrical interferences, which is inexpensive to construct and which is notable for small dimensions and for a high measurement accuracy. This is achieved by designing said interruption in the screen so that it is effective during the normal operation of the current transformer (1) and is shunted if high-frequency interferences occur.

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