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Electrical signal frequency detection method and device, equipment protection device and protection equipment

A frequency detection and electrical signal technology, applied in the field of electrical signal frequency detection, can solve the problem of wide data window of the filter, etc., achieve strong resistance, meet real-time requirements, and fast detection speed

Active Publication Date: 2015-11-25
SIEMENS AG
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  • Abstract
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Problems solved by technology

This detection technique has high precision and strong anti-interference, but the filter usually requires a wide data window

Method used

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  • Electrical signal frequency detection method and device, equipment protection device and protection equipment
  • Electrical signal frequency detection method and device, equipment protection device and protection equipment
  • Electrical signal frequency detection method and device, equipment protection device and protection equipment

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Embodiment Construction

[0053] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail through the following examples.

[0054] figure 1 It is a flow chart of an electrical signal frequency detection method provided according to an embodiment of the present invention. The method starts from step S110. In step S110, the zero-crossing point of the electrical signal under test is detected first. This step can be implemented by analog signal processing, for example, by analog circuits, or by digital signal processing, for example by using digital signal processors, microprocessors or computers.

[0055] figure 2 A waveform diagram of a fundamental electric signal is shown as an example, and the fundamental wave is a standard sine wave. figure 2 The four zero-crossing points P1, P2, P3 and P4 of the standard sine wave are shown in . When using the analog signal processing method, it is necessary to re...

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Abstract

The invention provides an electrical signal frequency detection method and device. The detection method comprises that a zero crossing point of a detected electrical signal is detected; whether the interval, obtained by detection, of the zero crossing point is greater than a set threshold is determined, and if yes, the frequency of the detected electrical signal is determined according to the interval of the zero crossing point; and otherwise, the detected electrical signal is filtered, and the frequency of the filtered signal is determined. The method and device can rapidly detect the frequency of the detected signal when interference is not strong, and a filtering detection manner is automatically switched to when interference is relatively strong; and thus, the interference resistance is high.

Description

technical field [0001] The invention relates to electric signal frequency detection technology, in particular to an electric signal frequency detection method and device, as well as an equipment protection method and protection equipment. Background technique [0002] Frequency is an important parameter of electrical signals. Equipment such as protection devices and smart meters need to measure the frequency of electrical signals. [0003] An existing electrical signal frequency detection technology realizes electrical signal frequency measurement by performing zero-crossing detection on the electrical signal under test. For example, the frequency of a signal is calculated by detecting the interval between zero crossings. However, this technology does not take into account interference factors, and its anti-interference ability is poor. The actual measured electrical signal will be subject to various interferences, so in practical application, this technique has low measur...

Claims

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Application Information

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IPC IPC(8): G01R23/02G01R23/15G01R1/36
Inventor 孙长元杨敏秦雷鸣李锦辉周香云戴体虎
Owner SIEMENS AG
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