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Grounding fault detecting circuit

A technology for detecting circuit and grounding faults, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of disappearance of grounding phenomenon, false grounding of no-load busbar, etc., to achieve the effect of sensitive use and simple operation

Pending Publication Date: 2017-01-11
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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  • Grounding fault detecting circuit

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Effect test

Embodiment 1

[0028] A ground fault detection circuit, with a hardware structure designed for fault detection and analysis, has the characteristics of simple operation and sensitive use, such as figure 1 As shown, it is specially set up as the following structure: including a three-phase vector input circuit, a first-stage adder circuit, a first window comparison circuit, a second window comparison circuit, and a detection and alarm processing circuit. The three-phase vector input circuit and the first The first-stage adder circuit is connected, the first-stage 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; A resistor R14, a resistor R15, a diode D3, a diode D4, a diode D5 and a capacitor C2 are arranged in the detection alarm processing circuit, the first end of the resisto...

Embodiment 2

[0030] 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 arrangement structure is adopted in particular: the first-stage adder circuit is provided with an integrated operational amplifier U1, a resistor R4, a resistor R5, a resistor R6 and a capacitor C1, and the resistor R4, the resistor R5 and the capacitor C1 are connected in parallel with each other, and One of the common terminals connected in parallel is connected to pin 9 of the integrated operational amplifier U1, and the other common terminal connected in parallel 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. Pin 8 of the integrated operational amplifier U1 is connected with the first window comparison circuit.

Embodiment 3

[0032] 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 setting structure is adopted in particular: a resistor R10, a resistor R11, a resistor R12, a resistor R13, a diode D2 and an integrated operational amplifier U2 are arranged in the first window comparison circuit, and the 8 pins of the integrated operational amplifier U1 It is connected to the 8-pin of the integrated operational amplifier U2, the first end of the resistor R11 is connected to the second end of the resistor R12, the first end of the resistor R12 is connected to the first end of the resistor R13, and the second end of the resistor R13 is respectively It is connected with the cathode of diode D2, the first end of resistor R14 and the 14th pin of integrated operational amplifier U2, the positive electrode of diode D2 is connected with the second end of resistor R11, and the 9th pin of int...

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Abstract

The invention discloses a grounding fault detecting circuit which comprises the components of a three-phase vector input circuit, a first-stage adder circuit, a first window comparing circuit, a second window comparing circuit and a detecting-and-alarming processing circuit. The three-phase vector input circuit is connected with the first-grade adder circuit. The first-grade adder circuit is connected with the first window comparing circuit and the second window comparing circuit. The first window comparing circuit and the second window comparing circuit are connected with the detecting-and-alarming processing circuit. The detecting-and-alarming processing circuit is internally provided with a resistor R14, a resistor R15, a diode D3, a diode D4, a diode D5 and a capacitor C2. The second end of the resistor R14 is connected with the cathode of the diode D13 and is furthermore connected with the first end of the capacitor C2, the first end of the resistor R15, the anode of the diode D4 and the cathode of the diode D5, thereby realizing a hardware structure which is designed for detecting and analyzing the fault. The grounding fault detecting circuit has advantages of simple operation, high sensitivity in use, etc.

Description

technical field [0001] The invention relates to the technical field of detection and processing, in particular to a ground fault detection circuit. 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 in different areas and cannot be stored in large quan...

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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