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A detection method and measuring device for the arc extinguishing efficiency of grid arc extinguishing chamber

A detection method and technology for an arc extinguishing chamber, which are applied in measuring devices, measuring electricity, and measuring electrical variables, etc., can solve the problems of lack of experimental verification of arc extinguishing chambers, lack of methods and devices, and unreliable numerical calculation results.

Active Publication Date: 2017-02-22
WENZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods rely too much on numerical calculation and simulation, lack of experimental verification of the magnetic field distribution and size in the arc extinguishing chamber, lack of experimental methods and devices, and the numerical calculation results are unreliable.

Method used

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  • A detection method and measuring device for the arc extinguishing efficiency of grid arc extinguishing chamber
  • A detection method and measuring device for the arc extinguishing efficiency of grid arc extinguishing chamber
  • A detection method and measuring device for the arc extinguishing efficiency of grid arc extinguishing chamber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1, when the input instantaneous current is 1000A such as Image 6 When the waveform in the figure is shown, the measurement results of No. 1 Hall sensor A, No. 2 Hall sensor B, No. 3 Hall sensor C and No. 4 Hall sensor are as follows Figure 7-10 shown. Wherein the magnetic induction intensity produced by grid sheet 2 is according to the formula (1) Carry out calculation, the size of η is the difference value of magnetic induction intensity inside arc-shaped conductor when there is grid piece 2 or not.

[0036] Table 1 Measurement results when the input current is 1000A

[0037]

[0038] Take No. 1 Hall sensor A as an example ( Figure 7 ), using the formula (1), it can be obtained that the arc extinguishing efficiency of this point is 27.2%; take No. 2 Hall sensor B as an example ( Figure 8 ), using the formula (1), it can be obtained that the arc extinguishing efficiency of this point is 33.2%; take No. 3 Hall sensor C as an example ( Figure 9 ),...

Embodiment 2

[0039] Embodiment 2, when the input instantaneous current is 500A such as Figure 11 When the waveform in the figure is shown, the measurement results of No. 1 Hall sensor A, No. 2 Hall sensor B, No. 3 Hall sensor C and No. 4 Hall sensor D are as follows Figure 12-15 shown. Wherein the magnetic induction intensity generated by the grid sheet 2 is calculated according to formula (1), and the size of η is the difference of the magnetic induction intensity inside the arc-shaped conductor with or without the grid sheet 2.

[0040] Table 2 Measurement results when the input current is 500A

[0041]

[0042] Take No. 1 Hall sensor A as an example ( Figure 12 ), using the formula (1), it can be obtained that the arc extinguishing efficiency of this point is 28.9%; take No. 2 Hall sensor B as an example ( Figure 13 ), using the formula (1), it can be obtained that the arc extinguishing efficiency of this point is 34.7%; take No. 3 Hall sensor C as an example ( Figure 14 ), ...

Embodiment 3

[0043] Embodiment 3, when the input instantaneous current is 800A such as Figure 16 When the waveform in the figure is shown, the measurement results of No. 1 Hall sensor A, No. 2 Hall sensor B, No. 3 Hall sensor C and No. 4 Hall sensor D are as follows Figure 17-20 shown. Wherein the magnetic induction intensity generated by the grid sheet 2 is calculated according to formula (1), and the size of η is the difference of the magnetic induction intensity inside the arc-shaped conductor with or without the grid sheet 2.

[0044] Table 3 Measurement results when the input current is 800A

[0045]

[0046] Take No. 1 Hall sensor A as an example ( Figure 16 ), using the formula (1), it can be obtained that the arc extinguishing efficiency of this point is 28.3%; take No. 2 Hall sensor B as an example ( Figure 17 ), using the formula (1), it can be obtained that the arc extinguishing efficiency of this point is 36.3%; take No. 3 Hall sensor C as an example ( Figure 18 ), ...

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Abstract

The invention discloses a method for detecting the arc extinguishing efficiency of a grid plate arc extinguishing chamber. The magnetic field, and the magnetic induction intensity of the same number of different parts inside the two arc columns are collected by the Hall sensor to obtain B1z1, B1z2, B1z3...; and B2z1, B2z2, B2z3...; c. Obtain the grid through the formula The arc extinguishing efficiency η1, η2, η3, ... of the arc extinguishing chamber; d. Calculate the average value of η1, η2, η3, ..., so as to obtain the arc extinguishing efficiency that characterizes the grid arc extinguishing chamber. The invention also discloses a measuring device for measuring the arc extinguishing efficiency of the grid sheet arc extinguishing chamber, which includes a conductive arc column, a numerically controlled instantaneous constant current source, a grid sheet, several Hall sensors, an oscilloscope and a memory. The invention can directly measure the blowing arc magnetic field in the grid plate arc extinguishing chamber, and the detection steps are simple and the result is reliable.

Description

technical field [0001] The invention relates to a method for detecting arc extinguishing efficiency, in particular to a method for detecting arc extinguishing efficiency of a metal grid sheet arc extinguishing chamber and a measuring device thereof under high current such as short circuit or overload. Background technique [0002] At present, metal grid arc extinguishing is the most widely used arc extinguishing method besides vacuum arc extinguishing and SF6 arc extinguishing. The basic principle is: when the circuit breaker breaks a short circuit or overloads a large current, an arc discharge will occur between the contacts; and the induced magnetic field generated by the metal grid forms a magnetic arc blowing force, which sucks the arc into the arc extinguishing chamber, and the arc is divided by the metal grid It is divided into several small sections, and the purpose of extinguishing the arc is achieved by using the near-cathode plate effect of the arc. The size of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/07G01R31/00
Inventor 舒亮吴桂初叶鹏章上聪
Owner WENZHOU UNIV
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