US 12,288,967 B2
Method for determining the state of an electrical switchgear assembly, monitoring unit for an electrical switchgear assembly, and electrical switchgear assembly
Ivana Mladenovic, Seukendorf (DE); and Anne Bauer, Röthenbach a.d. Pegnitz (DE)
Assigned to SIEMENS AKTIENGESELLSCHAFT, Munich (DE)
Appl. No. 18/006,781
Filed by Siemens Aktiengesellschaft, Munich (DE)
PCT Filed Jun. 28, 2021, PCT No. PCT/EP2021/067665
§ 371(c)(1), (2) Date Jan. 25, 2023,
PCT Pub. No. WO2022/022923, PCT Pub. Date Feb. 3, 2022.
Claims priority of application No. 10 2020 209 645.7 (DE), filed on Jul. 30, 2020.
Prior Publication US 2023/0268723 A1, Aug. 24, 2023
Int. Cl. H02B 13/025 (2006.01); G01R 31/12 (2020.01); G01R 31/327 (2006.01); H02B 1/24 (2006.01)
CPC H02B 13/025 (2013.01) [G01R 31/3275 (2013.01); H02B 1/24 (2013.01); G01R 31/1254 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for determining a state of an electrical switchgear assembly, the method comprising:
measuring an electric current and a voltage dropped across the switchgear assembly;
ascertaining a time interval of an arc occurring during a switching operation;
wherein the time interval begins when the measured voltage exceeds a first threshold value;
wherein the time interval ends when the current intensity falls below a second threshold value;
comparing the ascertained time interval to a reference value specific to the switchgear assembly;
measuring a voltage profile during the time interval; and
comparing the voltage profile with a reference voltage profile.