Dielectric loss on-line accurate measurement method based on phase factor transformation and interpolation

A phase factor, accurate measurement technology, applied in dielectric performance measurement, measurement device, measurement of electrical variables, etc., can solve the problems of greatly affected measurement results, unable to completely eliminate spectrum leakage, noise interference with aperiodic signals, etc.

A phase factor, accurate measurement technology, applied in dielectric performance measurement, measurement device, measurement of electrical variables, etc., can solve the problems of greatly affected measurement results, unable to completely eliminate spectrum leakage, noise interference with aperiodic signals, etc.

CN105588985AInactive Publication Date: 2016-05-18SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
7 Cites 12 Cited by

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Dielectric loss on-line accurate measurement method based on phase factor transformation and interpolation
  • Dielectric loss on-line accurate measurement method based on phase factor transformation and interpolation
  • Dielectric loss on-line accurate measurement method based on phase factor transformation and interpolation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0051] figure 1 In , the simplified schematic diagram of the circuit of the power capacitive device shows the relationship between the current vectors.

[0052] figure 2 Among them, the relationship between the voltage, current phase and dielectric loss angle δ of electric equipment, the dielectric loss angle δ is calculated by measuring the voltage and current fundamental wave phase angle.

[0053] image 3 Included in the overall flowchart of the present invention, comprises the following steps:

[0054] A. Digitally sample the voltage and current at both ends of the capacitive device to obtain discrete sampled values ​​of voltage and current;

[0055] B. Carry out FFT after adding Hanning window to the sampled voltage and current signals, and perform phase factor transformation on the spectrum to obtain new spectrum of voltage and current;

[0056] C. Perform 3 spectral line superposition interpolation on the fundamental frequency component of the new spectrum to obtai...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a dielectric loss on-line accurate measurement method based on phase factor transformation and interpolation. The method includes following steps of: 1) performing digital sampling on voltages and currents at both ends of electric power capacitive devices, and obtaining discrete sampling values of the voltages and the currents; 2) performing discrete Fourier transform in which a Hanning window is added on the discrete sampling values of the voltages and the currents, and performing phase factor transform on frequency spectra of the voltages and the currents and obtaining new frequency spectra of the voltages and the current; 3) performing three-spectral line superposition and interpolation on fundamental components of the new frequency spectra of the voltages and the currents, and obtaining fundamental phase values of the voltages and the currents; and 4) performing conversion on the obtained fundamental phase values of the voltages and the current, and calculating a dielectric loss angle delta and a dielectric value tan delta. Compared with the prior art, the dielectric loss on-line accurate measurement method based on the phase factor transformation and interpolation is simple and accurate.

Description

technical field [0001] The invention relates to the field of measurement of electric variables, in particular to an on-line precise measurement method of dielectric loss based on phase factor transformation and interpolation. Background technique [0002] Dielectric loss tangent, as an indicator to comprehensively reflect the characteristics of dielectric loss, is an important reference quantity for measuring and monitoring the insulation performance of various power equipment. It can reflect the defects of equipment insulation such as moisture, cracking, and air gap discharge. An important item for system equipment failure and monitoring equipment insulation performance. In recent years, with the rapid development of electrical equipment status detection technology, people pay more and more attention to the on-line measurement technology of dielectric loss, so different methods have been formed. According to the different measurement methods and principles of dielectric lo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
18 May 2016
Publication
CN105588985A
IPC
G01R27/26
CPC
G01R27/2694
Inventors
张鹏; 陈甜甜