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Fault earthing detection circuit powered based on filtering by PI filter

A ground fault and detection circuit technology, applied in the field of detection and processing, can solve problems such as disappearance of grounding phenomena, false grounding of unloaded busbars, etc., and achieve the effect of sensitive use and simple operation

Pending Publication Date: 2017-02-22
成都沃尔法特科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] (5) False grounding phenomenon of no-load bus
But when it is sent to a line, the grounding phenomenon will disappear by itself

Method used

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  • Fault earthing detection circuit powered based on filtering by PI filter
  • Fault earthing detection circuit powered based on filtering by PI filter
  • Fault earthing detection circuit powered based on filtering by PI filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A ground fault detection circuit based on π-type filter design and power supply, which adopts π-type RC filter circuit to filter the rectified DC power supply, and uses a voltage regulator tube to stabilize the voltage to provide a stable working voltage for the fault detection and processing circuit. Avoid inaccurate detection due to unstable voltage fluctuations during fault detection, such as figure 1 As shown, the following structure is specially arranged: a step-down transformer T, a rectifier circuit, a π-type RC filter circuit, a voltage regulator tube Z1 and a fault detection and processing circuit connected in sequence are arranged, and a bridge rectifier is arranged in the rectifier circuit. And the AC input terminal of the bridge rectifier is connected to the secondary terminal of the step-down transformer T, and the DC output terminal of the bridge rectifier is connected to the input terminal of the π-type RC filter circuit; a capacitor C3 is arranged in the ...

Embodiment 2

[0032] This embodiment is further optimized on the basis of the above-mentioned embodiments, further to better realize the present invention, such as figure 1 As shown, the following configuration structure is adopted in particular: a three-phase vector input circuit, an adder circuit, a first window comparison circuit, a second window comparison circuit, and a detection and alarm processing circuit are arranged in the fault detection processing circuit, and the three-phase The vector input circuit is connected with the adder circuit, the adder circuit is connected with the first window comparison circuit and the second window comparison circuit respectively, and both the first window comparison circuit and the second window comparison circuit are connected with the detection alarm processing circuit, so The negative pole of the regulator tube Z1 is connected to the first window comparison circuit, and the positive pole of the voltage regulator tube Z1 is connected to the secon...

Embodiment 3

[0034] This embodiment is further optimized on the basis of any of the above embodiments, further to better realize the present invention, such as figure 1 As shown, the following arrangement structure is adopted in particular: an integrated operational amplifier U1, a resistor R4, a resistor R5, a resistor R6 and a capacitor C1 are arranged in the adder circuit, and the resistor R4, the resistor R5 and the capacitor C1 are connected in parallel with each other, and after parallel connection One common terminal of the integrated operational amplifier U1 is connected to the 9-pin of the integrated operational amplifier, and the other common terminal after parallel connection is connected to the second window comparison circuit through the resistor R6, and the 10-pin of the integrated operational amplifier U1 is grounded through the resistor R6. The pin 8 of U1 is connected to the first window comparison circuit.

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Abstract

The invention discloses a fault earthing detection circuit powered based on filtering by a PI filter. The circuit comprises a step-down transformer T, a rectifier circuit, a PI RC filter circuit, a voltage regulator tube Z1 and a fault detection processing circuit, which are connected in sequence. A bridge rectifier is arranged in the rectifier circuit, the AC input end of the bridge rectifier is connected with the secondary end of the step-down transformer T, and the DC output end of the bridge rectifier is connected with input end of the PI RC filter circuit. A capacitor C3, a resistor R16 and a capacitor C4 are arranged in the PI RC filter circuit. The capacitor C3 is connected to the DC output end of the bridge rectifier. A first end of the capacitor C3 is connected with a first end of the resistor R16. A second end of the resistor R16 is connected with a first end of the capacitor C4. A second end of the capacitor C4 is connected with a second end of the capacitor C3. Inaccurate fault detection caused by unstable voltage fluctuation is avoided.

Description

technical field [0001] The invention relates to the technical field of detection and processing, in particular to a ground fault detection circuit designed and powered based on π-type filter filtering. Background technique [0002] The power system is a power production and consumption system composed of power generation, power transformation, power transmission, power distribution and power consumption. Its function is to convert the natural primary energy into electric energy through the power generation power plant (mainly including boilers, steam turbines, generators and auxiliary production systems of power plants, etc.), and then supply the electric energy to each load through the transmission, transformation system and power distribution system. The center, through various equipment, converts it into different forms of energy such as power, heat, light, etc., to serve the regional economy and people's lives. Since most of the power points and load centers are located...

Claims

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Application Information

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IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 姚清群
Owner 成都沃尔法特科技有限公司
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