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Small-current single-phase ground fault current detecting circuit and method based on stochastic resonance

A single-phase ground fault and current detection circuit technology, which is applied in the field of small current single-phase ground fault current detection and small current single-phase ground fault current detection circuit, can solve the problems of difficult line selection and low accuracy, and achieve avoidance of selection line error, improve reliability, and improve the effect of output signal-to-noise ratio

Active Publication Date: 2014-08-27
XIAN UNIV OF TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a small current single-phase ground fault current detection circuit based on stochastic resonance, to solve the problem of difficult line selection caused by the low accuracy of existing detection methods, and to improve the reliability of the line selection device

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  • Small-current single-phase ground fault current detecting circuit and method based on stochastic resonance
  • Small-current single-phase ground fault current detecting circuit and method based on stochastic resonance
  • Small-current single-phase ground fault current detecting circuit and method based on stochastic resonance

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Embodiment

[0050] In order to verify the effectiveness of the method of the present invention, the following hardware circuit experiments are performed on Figure 4 The stochastic resonance circuit in is verified. Assuming that the sampling resistance is 2.5Ω, and the fault current of the single-phase ground fault in the small current grounding system is 20mA, the corresponding fault voltage signal is 50mV. Take fault voltage signal amplitude as A1=A2=50mV, frequency as f1=250Hz, f2=900Hz, such as Image 6 (a) shown. Image 6 (b) is the superposition signal of two input signals, which is the original input signal. Take the noise amplitude as D1 = 500mV. Signal, noise superposition signal such as Image 6 As shown in (c), it can be found from the figure that the input signal is completely submerged by noise, and no information of the input signal can be obtained. The superimposed signal of the signal and noise is sent into the stochastic resonance system as the input signal. By adjus...

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Abstract

The invention discloses a small-current single-phase ground fault current detecting circuit based on stochastic resonance. The current detecting circuit comprises a circuit model formed by a summator circuit, two potentiometers, an integral circuit, a phase inverter circuit and a cubic circuit, wherein the input end of the circuit model is connected with a current mutual inductor, and the output end of the circuit model is connected with an A / D conversion chip. The detecting method adopting the circuit includes the steps that a current sensor and a signal collecting circuit are used for collecting fault signals on site; the collected fault signals are sent into the small-current single-phase ground fault current detecting circuit based on stochastic resonance and processed by the circuit to obtain fault zero-sequence current. The fault signals are rapidly and effectively detected, the problem that line selection is difficult to carry out because an existing detecting method is low in accuracy is solved, and reliability of a line selection device is improved.

Description

technical field [0001] The invention belongs to the technical field of power system intelligent state detection, and specifically relates to a small current single-phase ground fault current detection circuit based on stochastic resonance. The invention also relates to a method for detecting small current single-phase ground fault current by using the circuit. Background technique [0002] At present, the distribution network in all countries in the world adopts ungrounded neutral point, grounded by arc suppressing coil or resistance. When a ground fault occurs, the current flowing through the ground point is small, so it is called a small current grounding system. The most common fault in low current grounding systems is single-phase grounding. The grounding current is small when the single-phase is grounded. According to the provisions of the safe operation regulations of the power system, it can continue to run for 1 to 2 hours after a single-phase ground fault occurs. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R31/08
Inventor 焦尚彬唐金伟李清华
Owner XIAN UNIV OF TECH
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