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Method for testing electronic component and its instrument

A technology of electronic components and instruments, applied in the field of testing electronic components, can solve problems such as unguaranteed

Inactive Publication Date: 2007-12-05
HAEFELY TEST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This approach relies on assuming that the loss angle is constant with respect to frequency, but this cannot be guaranteed

Method used

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  • Method for testing electronic component and its instrument
  • Method for testing electronic component and its instrument
  • Method for testing electronic component and its instrument

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Embodiment Construction

[0011] A preferred embodiment of the present invention will be described below with reference to FIGS. 1 to 2 .

[0012] In the present invention, the excitation signal acting on the target under test contains a combination of two frequencies, which are on both sides of the power line frequency. They act simultaneously on the target being measured. The voltage across the electronic component and the current through it are simultaneously digitized and processed off-line by a computer system. To measure the loss angle at these two frequencies, the frequency components are rooted using the Fourier transform method.

[0013] In order to find the root of a frequency component using the Fourier transform method, two conditions must be met:

[0014] 1. For each considered frequency signal, an integer multiple of its period must be collected and processed;

[0015] 2. For each relevant frequency, the frequency used must be an integral multiple of the frequency to be measured.

[0...

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PUM

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Abstract

A process and an apparatus for measuring the impedance of a capacitive sample and thereby determining the leakage impedance and the loss angle. To suppress the effects of ambient power frequency fields coupling onto the test object, measuring frequencies on either side of the line frequency are imposed onto the test object. The voltage and current are captured using a detection system. These signals are digitised and processed using a computer to determine the real and imaginary voltages and currents at the two test frequencies. These components are then analysed to calculate the leakage impedance and phase angle at the two frequencies. By applying a linear interpolation between the two points, the impedance and loss angle at the line frequency can be measured.

Description

technical field [0001] The invention relates to a method and an instrument for testing electronic components. In particular, it relates to an apparatus for testing electronic components at a given frequency so as to avoid the influence of disturbances generated by the test circuit at said given frequency. The invention is particularly applicable to disturbed tests in power systems where spurious voltages and currents are induced in test circuits due to the presence of power line frequency fields, which may cause interfere. [0002] More specifically, the present invention relates to a method for measuring the leakage resistance and loss angle of a high-voltage component or an insulation system, and by means of the instrument, the condition of the high-voltage component or insulation system, and an apparatus for implementing the method Can be estimated as part of the installation and maintenance program. Background technique [0003] The condition of the insulation system ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/02G01R27/26
CPCG01R27/2694
Inventor 蒂莫西J·福西特
Owner HAEFELY TEST