Fast recognition system and method for power system fault current

A power system and fault current technology, applied in the direction of measuring electricity, measuring electrical variables, AC/pulse peak measurement, etc., can solve the problem of not being able to know the exact value of this fault, and achieve easy optimization processing, rapid quantitative identification, and filtering remove the effect

Inactive Publication Date: 2013-09-18
STATE GRID CORP OF CHINA +1
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Problems solved by technology

Using a pure hardware circuit, using the current i and the current change rate di / dt two criterion logic operations to identify whether the fault current exceeds the preset threshold to identify the fault current, this method can achieve rapid identification, but it is It can only know whether the fault current exceeds the threshold but cannot know the exact magnitude of the fault, which is limited in practical application

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  • Fast recognition system and method for power system fault current
  • Fast recognition system and method for power system fault current
  • Fast recognition system and method for power system fault current

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Embodiment Construction

[0025] see figure 1 As shown, a power system fault current rapid identification system of the present invention includes a signal conditioning circuit 1 and a signal processing device 2 . The signal conditioning circuit 1 preprocesses the current i or the current change rate signal di / dt in the power conductor, and the signal processing device 2 samples the processed signal at equal time intervals (50-200 microseconds), and through mathematical The operation obtains the first characteristic quantity signal A which is proportional to the first-order differential of the current and the second characteristic quantity signal B which is proportional to the second-order differential of the current, and then according to the trigonometric function relationship Calculate the short-circuit current steady-state peak value I m .

[0026] The signal processing device 2 is a computer system or a single-chip microcomputer system (MCU or DSP) or an FPGA module; the signal conditioning cir...

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Abstract

The invention relates to a fast recognition system and method for power system fault current. Signals for current in a circuit and current change rate transient value are sampled in real time, so that a first characteristic signal in direct proportion to current first-order differential and a second characteristic signal in direct proportion to current second-order differential are obtained; the two characteristic signals at a same time point are calculated according to the theory of trigonometric function, so that the peak of steady-state short-circuit current is obtained. The fast recognition system and method for power system fault current has the advantages that the differential value of short-circuit current is used for calculation, so that the effect of aperiodic components upon calculation results is effectively filtered; short-circuit current can be recognized quickly and quantitatively for less than 3ms of response time; quantitative recognition is convenient for classifying short-circuit faults according to short-circuit levels.

Description

technical field [0001] The invention relates to the field of fault current detection, in particular to a fault current rapid identification system and method, which are mainly used for rapid detection of short-circuit faults in power systems and other industrial power systems. Background technique [0002] When a short-circuit fault occurs in the power system or the power system of an industrial user, in order to minimize the adverse effects caused by the short circuit, it is required that the relay protection or other auxiliary electronic devices can identify the short-circuit fault at the fastest speed and accurately predict the short-circuit current level, and control the action of circuit breakers or other breaking devices according to a certain strategy at the first time to cut off the fault circuit. The traditional short-circuit fault identification method needs to use the Fourier transform to extract the fundamental wave component, and the identification speed is rela...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/04G01R31/02
Inventor 李品德李久红李娟绒薛军宋义
Owner STATE GRID CORP OF CHINA
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