Circuit breaker

Patent metadata

Field	Value
Publication number	US-10209280-B2
Application number	US-201514961979-A
Country	US
Kind code	B2
Filing date	Dec 8, 2015
Priority date	Dec 18, 2014
Publication date	Feb 19, 2019
Grant date	Feb 19, 2019

Abstract

A circuit breaker for a low-voltage circuit is disclosed. In an embodiment, the circuit breaker includes a current conductor, assigned a measuring transducer for measuring the electrical current of the current conductor; a first filter connected to the measuring transducer; an analog/digital converter connected to the first filter; a second, high-pass filter connected to the analog/digital converter; and a digital integrator, connected to the high-pass filter and configured to determine the electrical current of the current conductor.

First claim

What is claimed is:

1. A circuit breaker for a low-voltage circuit, comprising: a low voltage circuit breaker having a series of:
a current conductor, assigned a measuring transducer to measure electrical current of the current conductor;
a first filter connected to the measuring transducer;
an analog/digital converter, connected to the first filter;
a second filter, connected to the analog/digital converter; and
a digital integrator, connected to the second filter at a position downstream of the second filter and configured to determine the electrical current of the current conductor.

2. The circuit breaker of claim 1 , wherein the digital integrator is a two-stage digital integrator.

3. The circuit breaker of claim 1 , wherein the first filter is a low-pass or bandpass filter.

4. The circuit breaker of claim 1 , wherein the second filter is a high-pass filter.

5. The circuit breaker of claim 1 , wherein the second filter is a digital filter.

6. The circuit breaker of claim 1 , wherein the first filter is a multistage filter.

7. The circuit breaker of claim 1 , wherein the second filter is in the form of an infinite impulse response filter.

8. The circuit breaker of claim 1 , wherein the second filter includes components configured to carry out a fast Fourier transform and an inverse fast Fourier transform.

9. The circuit breaker of claim 2 , wherein the digital integrator includes a microprocessor, configured to carry out two-stage discrete integration.

10. The circuit breaker of claim 9 , wherein the digital integrator is configured to carry out the integration using Simpson's formula.

11. The circuit breaker of claim 9 , wherein the digital integrator is configured to carry out calculations with twice a strip width in a secondary calculation during the two-stage integration.

12. The circuit breaker of claim 3 , wherein the second filter is a high-pass filter.

13. The circuit breaker of claim 3 , wherein the second filter is a digital filter.

14. The circuit breaker of claim 2 , wherein the first filter is a multistage filter.

15. The circuit breaker of claim 3 , wherein the second filter is in the form of an infinite impulse response filter.

16. The circuit breaker of claim 3 , wherein the second filter includes components configured to carry out a fast Fourier transform and an inverse fast Fourier transform.

17. The circuit breaker of claim 1 , wherein the first filter is directly connected to the current conductor, the analog/digital converter is directly connected to the first filter, the second filter is directly connected to the analog/digital converter, and the digital integrator is directly connected to the second filter.

18. The circuit breaker of claim 1 , wherein the low voltage circuit breaker is configured for voltages up to 1500 volt dc.

Assignees

• Siemens Ag

Inventors

• Borgwardt Andre
• Bruell Marco
• Kopaczewski Peter

Classifications

• G01R15/181

  using coils without a magnetic core, e.g. Rogowski coils · CPC title

• H01H71/123

  using a solid-state trip unit (circuits H02H) · CPC title

• G01R19/2509 Primary

  Details concerning sampling, digitizing or waveform capturing · CPC title

• G01R21/002

  Measuring real component · CPC title

• G01R19/0092 Primary

  Measuring current only · CPC title