US 9,810,719 B2
Neutral pole current transformer module for circuit breaker and neutral pole current detecting apparatus for circuit breaker
Jin Seok Youn, Cheongju-si (KR)
Assigned to LSIS CO., LTD., Anyang-si (KR)
Filed by LSIS CO., LTD., Anyang-si, Gyeonggi-do (KR)
Filed on Jun. 11, 2015, as Appl. No. 14/737,374.
Claims priority of application No. 10-2014-0081174 (KR), filed on Jun. 30, 2014.
Prior Publication US 2015/0377930 A1, Dec. 31, 2015
Int. Cl. G01R 15/18 (2006.01); H02H 3/08 (2006.01); H01F 38/30 (2006.01); H01H 71/12 (2006.01); H01H 83/02 (2006.01); H01H 50/02 (2006.01)
CPC G01R 15/181 (2013.01) [H01F 38/30 (2013.01); H01H 50/021 (2013.01); H01H 71/125 (2013.01); H01H 83/02 (2013.01); H02H 3/083 (2013.01); G01R 15/18 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A neutral pole transformer module for a circuit breaker to which a current transformer for detecting a neutral pole current is connected, the neutral pole transformer module comprising:
a zero-phase current transformer connected to the current transformer, the zero-phase current transformer configured to pass a neutral pole detection current output from the current transformer and to provide a secondary output current signal that is obtained by reducing the neutral pole detection current from the current transformer according to a predetermined ratio;
a printed circuit board (PCB) connected to an output terminal of the zero-phase current transformer, the PCB configured to convert the secondary output current signal to a voltage signal, to differentiate the converted voltage signal and to output a differentiated voltage; and
an enclosure formed of an electrical insulator and enclosing the zero-phase current transformer and the PCB.