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A method of measuring dielectric loss

A measurement method and dielectric loss technology, which is applied in the direction of measuring devices, measuring electrical variables, measuring resistance/reactance/impedance, etc., can solve the problems of low precision, unreliable analysis results, short-range leakage, etc., and achieve low analysis accuracy , improved instruments and equipment, and easy-to-achieve effects

Active Publication Date: 2018-11-23
JIANGSU UNIV OF TECH
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Problems solved by technology

[0007] In engineering applications, harmonic analysis always carries out limited point sampling and it is difficult to achieve strict synchronous sampling
In this way, when quasi-synchronous DFT is used for harmonic analysis, there will be long-range leakage due to the truncation effect and short-range leakage due to the fence effect, making the analysis results inaccurate and even unreliable

Method used

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Embodiment 1

[0038] A kind of dielectric loss measurement method of the present embodiment, comprises the following steps:

[0039] (1) The data of W+2 sampling points of the voltage signal V and current signal I applied to the test piece are sampled synchronously at equal intervals: {f V (i), f I (i), i=0, 1, . . . , W+1}. W is selected according to the selected integration method. If the complex trapezoidal integration method is used, W=nN; if the complex rectangular integration method is used, W=n(N-1); if the complex Simpson integration method is used , then W=n(N-1) / 2; then according to the sampling frequency f s =Nf, to obtain the sampling point data sequence; n is the number of iterations, generally n≥3.

[0040] (2) From the sampling point i=0 of the voltage signal V, the quasi-synchronous DFT formula is applied:

[0041] Analyze W+1 data to obtain the fundamental wave information of the voltage signal V and an iteration coefficient γ i Determined by the integration method, ...

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Abstract

The invention relates to a dielectric loss measuring method which is realized by improvement based on quasi-synchronization DFT. The dielectric loss measuring method comprises the following steps that a voltage signal V applied to a tested piece and a current signal I flowing through the tested piece are sampled simultaneously; a cardinal wave phase angle phi<V1> applying voltage is acquired by applying a quasi-synchronization DFT harmonic phase angle linear modification method; a cardinal wave initial phase angle phi<I1> of the current signal flowing through the tested piece is acquired by applying the quasi-synchronization DFT harmonic phase angle linear modification method; and dielectric loss angle tangent is calculated according to the formula tgdelta=tg[pi / 2-(ph<I1>-phi<V1>)]. The dielectric loss measuring method is suitable for effectively improving analysis error of the quasi-synchronization DFT harmonic analysis technology to acquire a high-precision harmonic phase angle analysis result so that reliability of dielectric loss measurement can be enhanced.

Description

technical field [0001] The invention relates to a high-precision dielectric loss measurement method. Background technique [0002] The intelligent dielectric loss measuring instrument is an automatic instrument for measuring the dielectric loss tangent and capacitance value. It can measure various high-voltage equipment such as insulating materials, insulating bushings, power cables, capacitors, transformers, and transformers on the spot under power frequency and high voltage. Dielectric loss tangent and capacitance value. The instrument is also suitable for measuring the dielectric loss tangent and capacitance value of high-voltage electrical equipment in workshops, laboratories, and scientific research units; it is equipped with an insulating oil cup to measure the dielectric loss of insulating oil. [0003] The working principle of the intelligent dielectric loss measuring instrument: when an AC voltage is applied to the dielectric, the phase angle difference between the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/26
Inventor 傅中君王建宇欧云陈鉴富侯雪亚
Owner JIANGSU UNIV OF TECH
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