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Dielectric loss factor measurement method based on equivalent model

A technology of dielectric loss factor and measurement method, which is applied in the direction of testing dielectric strength, can solve problems such as large errors, achieve the effects of suppressing errors, strong anti-interference ability, and reducing calculation errors

Inactive Publication Date: 2011-08-17
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

According to the regulations of the power system, the frequency of the signal is allowed to change within the range of 49.5-50.5 Hz. If the frequency information cannot be obtained and the frequency deviates from 50 Hz to a certain extent, the conventional Fourier algorithm, etc. have large problems in calculating the dielectric loss factor. error

Method used

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  • Dielectric loss factor measurement method based on equivalent model
  • Dielectric loss factor measurement method based on equivalent model
  • Dielectric loss factor measurement method based on equivalent model

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Embodiment Construction

[0030] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0031] The steps of the present invention are as attached figure 1 Shown:

[0032] 1. Use a voltage transformer or a capacitive voltage divider to obtain the voltage signal applied to the insulation of the capacitive equipment, and use a through-hole current sensor or a series current sensor to obtain the current signal flowing through the insulation of the capacitive equipment.

[0033] 2. Use the windowed interpolation Fourier algorithm to obtain the signal frequency, and then use the fast Fourier algorithm or the method of correcting the ideal sampling frequency to obtain the harmonics of the signal.

[0034] 2.1 Obtain the frequency of the signal

[0035] This method uses the Hanning window interpolation Fourier...

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Abstract

The invention discloses a dielectric loss factor measurement method based on an equivalent model, belonging to the technical field of electrical equipment test. The method comprises the following steps: measuring a voltage signal and a current signal on equipment insulation to obtain signal frequency and subharmonic waves; and calculating the dielectric loss factor in that way that the insulation is equivalent to two models, namely parallel connection of a resistor and a capacitor and series connection of a resistor and a capacitor. By the method, the signal frequency fluctuation and the measurement error of the dielectric loss factor caused by the existence of the harmonic wave can be inhibited; and the method has strong anti-interfere capacity and high calculation accuracy.

Description

technical field [0001] The invention belongs to the technical field of electrical equipment testing, in particular to a method for measuring dielectric loss factor based on an equivalent model. Background technique [0002] The dielectric loss factor is the ratio of the total active power to the total reactive power of the medium under the action of a sinusoidal alternating electric field. The active power is usually composed of losses caused by lossy polarization and insulation resistance. If the insulation of electrical equipment is damp, Penetrating conductive channels, bubble ionization, delamination, shelling, aging, deterioration, etc., at this time, the insulation resistance of the dielectric decreases, the lossy polarization increases, and the corresponding dielectric loss will increase. Therefore, measuring the dielectric loss factor can effectively reflect the insulation condition of electrical equipment. For high-voltage electrical equipment, insulation damage is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
Inventor 赵丽娟李永倩
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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