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Circuit breaker

A circuit breaker and filter technology, applied in instruments, circuits, electrical devices, etc., can solve the problems of small temperature drift, signal waveform distortion, expensive correction methods, etc., achieve small filter stage overhead, accurate current determination, simple The effect of digital processing

Inactive Publication Date: 2016-06-29
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This can lead to distortion of the signal waveform in the case of mixed signals
[0013] The phase error between current and voltage due to this analog integration often cannot be completely eliminated
The result then is that such a shifted current signal leads, for example, to incorrect power measurements with regard to active power
[0014] The problem of analog integration has hitherto been solved with expensive calibrations, components with the narrowest possible nominal tolerances and the smallest possible temperature drift, and expensive correction methods

Method used

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Examples

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Embodiment Construction

[0030] figure 1 A conductor SL of an electrical circuit or a current path, eg a circuit breaker, eg a low-voltage circuit breaker, associated with the measuring transducer MW is shown. Measuring transducer MW can be a Rogowski transducer, for example. It is connected to the first filter F1. The first filter F1 may be a multistage filter. It can be a low pass or band pass filter. Furthermore, the first filter F1 can also perform signal scaling or perform amplitude adjustment. The first filter F1 is connected to an analog-to-digital converter AD. It is in turn connected to a second filter F2. The second filter F2 may be a digital filter. It can be a high pass filter. The second filter F2 can be designed, for example, as an infinite impulse response filter or as an IIR filter. It can be, for example, a three-pole filter. The second filter F2 can perform a Fast Fourier Transform or an Inverse Fast Fourier Transform for simple filtering in the frequency range. The second ...

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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.

Description

technical field [0001] The invention relates to a circuit breaker for a low voltage circuit. Background technique [0002] Circuit breakers for low voltage circuits are generally known. It exists in different designs and is called Molded Case Circuit Breaker (Molded Case Circuit Breaker), Air Circuit Breaker (Air Circuit Breaker), etc. Low-voltage circuits refer to circuits or electrical equipment for voltages up to 1000 VAC or 1500 VAC. [0003] A circuit breaker monitors the electrical circuit for the current condition or the presence of other electrical conditions. In particular in the event of a short circuit or an overcurrent exceeding a predetermined current value, the circuit breaker opens the circuit. [0004] To measure the current of electrical conductors, various measuring transducers are used. This generally provides a quantity or equivalent that is proportional to the current of the electrical conductor. [0005] For example, transformers or Rogowski transf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R21/00
CPCG01R19/0092G01R21/002H01H71/123G01R15/181G01R19/2509
Inventor A.博格沃特M.布鲁尔P.科帕切夫斯基
Owner SIEMENS AG
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