A Current Sensing Transformer System For A Circuit Breaker

Abstract: Described herein is a current sensing transformer system [100] deployed on at least one pole assembly [202] of a circuit breaker [200], wherein the at least one pole assembly [202] employs a primary bus-bar member [204] and a secondary bus-bar member. The current sensing transformer system [100] adapted to measure current in the primary bus-bar member [204], comprising: a casing member [102] defining either of a plus-shaped (+) cavity [108] or a polygonal cavity [108’] for receiving the primary bus-bar member [204] therethrough; and a current-sensing electromagnetic coil [106a] and a transformer electromagnetic coil [106b], positioned around the plus-shaped (+) cavity [108] and/or the polygonal cavity [108’] of the casing member [102], to assist in measuring the current flowing across the primary bus-bar member [204]. Notably, the current-sensing electromagnetic coil [106a] is a rogowski coil. Refer Figures 4 and 6.

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