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Universal voltage input power frequency signal frequency measurement system

A power frequency signal and frequency measurement technology, applied in the field of electrical systems, can solve the problems of long input signal delay, difficult to guarantee accuracy, and narrow application range, and achieve the effects of poor hardware versatility, increased reliability, and improved sensitivity.

Active Publication Date: 2018-03-06
云南电网有限责任公司保山供电局
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problems of complex circuits, long delays for input signals, difficulty in ensuring accuracy, or narrow application ranges in power system frequency measurement methods in the prior art, and propose a general voltage input power frequency signal frequency measuring system

Method used

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  • Universal voltage input power frequency signal frequency measurement system
  • Universal voltage input power frequency signal frequency measurement system
  • Universal voltage input power frequency signal frequency measurement system

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Embodiment Construction

[0026] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions and some principles of the examples of the present invention will be described below in conjunction with the accompanying drawings. The present invention designs a general voltage input power frequency signal frequency measurement system, such as figure 1 Shown is the circuit schematic diagram of the power frequency signal frequency measurement system with universal voltage input. The present invention converts the wide-range universal voltage input signal transmitted from the power secondary transformer into a fixed-frequency pulse signal through a voltage conversion circuit, a conversion voltage self-adjusting amplifying circuit, a band-pass filter circuit, and a comparator circuit, and sends it to a digital signal The processing circuit performs real-time calculation and acquisition.

[0027] figure 1 It is a schematic diagram of a power fre...

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Abstract

A universal voltage input power frequency signal frequency measurement system is mainly composed of a voltage conversion circuit, a conversion voltage self-adjustment and amplification circuit, a band-pass filter circuit, a comparator circuit, a digital signal processing circuit and a power supply circuit. The voltage conversion circuit can be applied to a 0 to 300V AC power frequency signal inputand can satisfy most of the application occasions of a power system. The conversion voltage self-adjustment and amplification circuit can automatically adjust the amplification factor of an output voltage according to the amplitude of the output voltage of the voltage conversion circuit to meet the weak power frequency signal frequency detection requirement. The band-pass filter circuit achievesa good selectivity of power frequency signals with a center frequency around 50Hz to suppress the interference of high-frequency signals. The comparator circuit converts an input AC signal into a DC signal, and the signal output by the comparator circuit does not require signal isolation and can be directly connected to the digital signal processor to complete the frequency calculation. The universal voltage input power frequency signal frequency measurement system in the invention has the characteristics of simple circuit, small phase delay, wide application range and high reliability.

Description

technical field [0001] The application belongs to the technical field of electrical systems, and in particular relates to the frequency measurement technology of relay protection devices. Background technique [0002] In the traditional power system relay protection device, the input signal is the power frequency (50Hz) signal transmitted by the secondary transformer, the voltage value may be tens of volts to hundreds of volts, and the relay protection device needs a cycle (20mS) Collect real-time data with a fixed number of points (24 points or 40 points). According to these data, the relay protection device must perform real-time protection algorithm calculations to determine whether there are various faults such as short circuit or grounding in the power grid. In order to ensure the accuracy and reliability of the protection algorithm, the data collected by the cycle wave should be an integral multiple of the actual frequency (50Hz), and the phase delay should be as small...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/02
CPCG01R23/02
Inventor 叶志祥徐万方孙灿陈秋荣陈丽惠唐喜龙朝文潘红帅熊伟刘涛朱红杰舒越
Owner 云南电网有限责任公司保山供电局
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