US 11,875,956 B2
Contact point monitoring device for vacuum circuit breaker, and vacuum circuit breaker comprising same
Min-Kyu Seo, Anyang-si (KR)
Assigned to LS ELECTRIC CO., LTD., Anyang-si (KR)
Appl. No. 17/431,779
Filed by LS ELECTRIC CO., LTD., Anyang-si (KR)
PCT Filed Sep. 10, 2019, PCT No. PCT/KR2019/011719
§ 371(c)(1), (2) Date Aug. 18, 2021,
PCT Pub. No. WO2020/171328, PCT Pub. Date Aug. 27, 2020.
Claims priority of application No. 10-2019-0018651 (KR), filed on Feb. 18, 2019; and application No. 10-2019-0018681 (KR), filed on Feb. 18, 2019.
Prior Publication US 2022/0115197 A1, Apr. 14, 2022
Int. Cl. H01H 33/662 (2006.01); H01H 33/664 (2006.01); H01H 33/666 (2006.01)
CPC H01H 33/6661 (2013.01) [H01H 33/662 (2013.01); H01H 33/664 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A contact monitoring device, comprising:
a vacuum circuit breaker, including:
a vacuum interrupter having a fixed electrode and a movable electrode;
a push rod assembly coupled to the movable electrode for raising up or lowering the movable electrode;
a discriminative sticker that has a plurality of areas arranged in a movement direction of the push rod assembly; and
a sensor assembly configured to monitor a position of the discriminative sticker and having a sensing direction different from the movement direction of the push rod assembly,
wherein the plurality of areas have reflectance varying in a stepwise manner.