US 12,265,126 B2
Contact monitoring device for vacuum circuit breaker and vacuum circuit breaker having same
Min-Kyu Seo, Anyang-si (KR)
Assigned to LS ELECTRIC CO., LTD., Anyang-si (KR)
Appl. No. 17/641,608
Filed by LS ELECTRIC CO., LTD., Anyang-si (KR)
PCT Filed May 11, 2020, PCT No. PCT/KR2020/006166
§ 371(c)(1), (2) Date Mar. 9, 2022,
PCT Pub. No. WO2021/049733, PCT Pub. Date Mar. 18, 2021.
Claims priority of application No. 10-2019-0112048 (KR), filed on Sep. 10, 2019; and application No. 10-2019-0112049 (KR), filed on Sep. 10, 2019.
Prior Publication US 2022/0317188 A1, Oct. 6, 2022
Int. Cl. G01R 31/327 (2006.01); H01H 33/662 (2006.01); H01H 33/664 (2006.01); H01H 33/666 (2006.01)
CPC G01R 31/327 (2013.01) [H01H 33/662 (2013.01); H01H 33/664 (2013.01); H01H 33/666 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A contact monitoring device for a vacuum circuit breaker, wherein the vacuum circuit breaker includes:
a vacuum interrupter having:
a fixed electrode fixed in an insulating container and having a fixed contact at one end thereof; and
a movable electrode installed in the insulating container so as to be able to move up and down, wherein the movable electrode has a movable contact at one end thereof,
wherein the movable contact comes into contact with or is separated from the fixed contact as the movable contact moves up and down; and
a push rod assembly coupled to the other end of the movable electrode to move up and down the movable electrode,
wherein the contact monitoring device includes:
a discriminative member formed on an outer circumferential face of a rod housing of the push rod assembly, wherein the discriminative member is stepped relative to the outer circumferential face of the rod housing; and
a sensor assembly installed adjacent to the discriminative member, wherein the sensor assembly is configured to detect presence or absence of a step between the outer circumferential face of the rod housing and an outer side face of the discriminative member.