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Method and system for measuring frequency characteristic of iron core of dry-type voltage transformer

A technology of voltage transformer and measurement method, which is applied in the direction of measuring electric power, apparent power measurement, measuring current/voltage, etc., and can solve problems such as the influence of iron core loss and iron core permeability, and the accuracy of output voltage on the secondary side

Pending Publication Date: 2021-09-21
HARBIN UNIV OF SCI & TECH
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Harmonics will affect the core loss and core permeability of the dry-type voltage transformer, thereby affecting the accuracy of the secondary side output voltage

Method used

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  • Method and system for measuring frequency characteristic of iron core of dry-type voltage transformer
  • Method and system for measuring frequency characteristic of iron core of dry-type voltage transformer
  • Method and system for measuring frequency characteristic of iron core of dry-type voltage transformer

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Embodiment Construction

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. refer to Figure 1-2 , the invention provides a method for measuring the frequency characteristics of a dry-type voltage transformer core, the specific steps are as follows:

[0033] Step 1: Prepare test components: iron core of dry-type voltage transformer, iron core skeleton, single-strand copper wire, insulating tube, insulating tape, wire cutters, pliers, copper wire nose, power analyzer, signal generator, signal Acquisition lines, power lines, wires.

[0034] Step 2: By reading the structural parameters of the iron core 1, it is obtained that the cross-sectional diameter of the iron core 1 is 26mm. To select the iron core skeleton 2, its inner diameter is required to be larger than the section diameter of the iron core 1, and the inner diameter of the iron core skeleton 2 is selected t...

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Abstract

The invention relates to the technical field of power transformation equipment, in particular to a method for measuring frequency characteristics of an iron core of a dry-type voltage transformer. The signal generator applies voltage with constant amplitude and adjustable frequency to the iron core, current, active power, reactive power, apparent power and power factors under different frequencies are obtained from the power analyzer, and the purpose of measuring the frequency characteristic of the iron core is achieved. The obtained data is calculated and analyzed to obtain the influence of the frequency on the iron core loss and the iron core magnetic conductivity. The method has guiding significance in the aspect of researching the influence of harmonic waves on the measurement precision of the dry-type voltage transformer.

Description

technical field [0001] The invention relates to the technical field of power transformation equipment, in particular to a method for measuring frequency characteristics of iron cores of dry-type voltage transformers. Background technique [0002] Due to the advantages of simple structure, easy maintenance and reasonable price, dry-type voltage transformers are widely used in power systems. Dry-type voltage transformers can separate electrical equipment such as measuring instruments and relay protection devices in the line from the system to reduce risks. At the same time, they also play the role of changing voltage and expanding the range of measuring instruments. [0003] Due to the use of various high-power rectifiers, inverters, and frequency conversion devices in the power system, and the increasing proportion of various nonlinear loads on the user side, there are a large number of harmonic components in the power system. [0004] The sources of harmonics can be mainly ...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01R35/02G01R19/00G01R21/00G01R27/02
CPCG01R31/00G01R35/02G01R19/00G01R21/005G01R21/003G01R21/002G01R27/02
Inventor 聂洪岩王伟王永红
Owner HARBIN UNIV OF SCI & TECH
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