| CPC G01R 15/181 (2013.01) [G01R 31/327 (2013.01)] | 5 Claims |
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1. A circuit breaker operating current/fault current measuring device, comprising:
a Rogowski coil installed to wrap around a current-carrying conductor;
a protection circuit outputting a fault voltage based on a voltage generated from a tap installed on a portion of the Rogowski coil; and
a measurement circuit outputting an operating voltage based on a voltage generated in the Rogowski coil,
wherein the Rogowski coil includes:
a donut-shaped air core;
a Rogowski inner coil disposed at a center line of the air core inside the air core and at a starting point of the air core; and
a Rogowski outer coil passing through an inside of the air core and connected to the Rogowski inner coil derived from an end point of the air core, and wound in a coil shape on an outside of the air core and disposed as the starting point of the air core,
wherein the protection circuit connects the Rogowski outer coil located at the starting point as one input and connects a point of a predetermined ratio of the Rogowski outer coil connected to the end point as another input, and
wherein the point of the predetermined ratio connected as the another input of the protection circuit is obtained by dividing {maximum operating voltage/maximum operating current} with {maximum fault voltage/maximum fault current}.
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