Granted Patent B2

US 12,288,967 · App. 18/006,781 · Granted Apr 29, 2025

Inventors: Ivana Mladenovic (Seukendorf, DE); Anne Bauer (Röthenbach a.d. Pegnitz, DE)

Assignee: SIEMENS AKTIENGESELLSCHAFT

H02B13/025G01R31/3275H02B1/24G01R31/1254

Abstract

Claims (28)

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.

2. The method as claimed in claim 1 , wherein the voltage is measured at least every 1 ms.

3. The method as claimed in claim 1 , wherein the current is measured at least every 1 ms.

4. The method as claimed in claim 1 , wherein the reference value defined for the switchgear assembly depends on a maximum current intensity present at said switchgear assembly in a closed state thereof.

5. The method as claimed in claim 1 , wherein the reference voltage profile is ascertained depending on a maximum current intensity present at said switchgear assembly in a closed state thereof.

6. The method as claimed in claim 1 , wherein the current intensity present at said switchgear assembly in a closed state thereof is at least 16 A.

7. The method as claimed in claim 1 , further comprising generating a signal if the time interval exceeds the reference value by a limit value.

8. The method as claimed in claim 7 , wherein the signal is generated if the time interval exceeds the reference value by 10%.

9. A monitoring unit for an electrical switchgear assembly, the monitoring unit comprising:

a measuring unit for measuring a current intensity flowing through the switchgear assembly and a voltage dropped across the switchgear assembly; and

an evaluation unit with a memory;

wherein the memory stores a first threshold value for the voltage and a second threshold value for a electric current intensity; and

the evaluation unit is programmed to ascertain a time interval indicating a duration between the first threshold value being exceeded and the second threshold value being fallen below, and to compare the ascertained time interval with a reference value stored in the memory.

10. The monitoring unit as claimed in claim 9 , wherein the evaluation unit is configured to produce a signal if the time interval exceeds the reference value by a limit value.

11. The monitoring unit as claimed in claim 10 , further comprising a communication device configured to transmit the signal to a decentralized data processing device.

12. An electrical switchgear assembly comprising:

a measuring unit for measuring a current intensity flowing through the switchgear assembly and a voltage dropped across the switchgear assembly; and

an evaluation unit with a memory;

wherein the memory stores a first threshold value for the voltage and a second threshold value for the current intensity; and

the evaluation unit is programmed to ascertain a time interval indicating a duration between the first threshold value being exceeded and the second threshold value being fallen below, and to compare the ascertained time interval with a reference value stored in the memory.

13. The electrical switchgear assembly as claimed in claim 12 , configured to switch current intensities of more than 16 kA.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (24)