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Novel dielectric loss measurement method based on Nuttall window - five-point converting FFT

A point transformation and loss measurement technology, applied in the field of dielectric loss angle measurement, which can solve the problems of slow response, synchronous sampling, etc.

Inactive Publication Date: 2015-12-09
FUZHOU UNIV
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Problems solved by technology

The phase-locked loop is simple to implement, but due to its slow response, it cannot truly realize fully synchronous sampling

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  • Novel dielectric loss measurement method based on Nuttall window - five-point converting FFT
  • Novel dielectric loss measurement method based on Nuttall window - five-point converting FFT
  • Novel dielectric loss measurement method based on Nuttall window - five-point converting FFT

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Embodiment Construction

[0027] A new method of dielectric loss measurement based on Nuttall window-five-point transform FFT. First, the Nuttall window is used to truncate the voltage and current signals in the time domain; the phasor sequence of the voltage and current is obtained by the fast Fourier algorithm; The phasor sequence of the obtained voltage and current is transformed by five-point weighting, and then the phase angle of the fundamental voltage and current is calculated by using the transformed new voltage and current phasor sequence, so as to obtain the dielectric loss angle. For specific calculation steps, see figure 1 .

[0028] The main calculation steps are as follows:

[0029] Step S1: Sampling the voltage signal u(t) and current signal i(t) containing harmonics, noise and DC components at a sampling frequency f s Sampling to obtain a discrete-time signal:

[0030] u ( n ) = r a n ...

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Abstract

The present invention relates to a novel dielectric loss angle measurement method with high precision based on a Nuttall window - five-point converting FFT. The method includes the steps as follows: cutting off input signals by utilizing a Nuttall window so as to reduce a cut-off error; calculating out a signal phasor sequence after cut off by utilizing the FFT; performing a weighted average to a FFT output sequence by utilizing the five-point converting so as to increase the spectral line decay rate outside a basic frequency point, thereby reducing the spectrum leakage effect; and finally, calculating out the dielectric loss angle by analyzing the novel weighted signal phasor sequence. The novel dielectric loss measurement method can efficiently overcome influence of a DC component, a fundamental frequency, a harmonic wave, and random noise on the dielectric loss angle measurement, the measurement accuracy can achieve a value of 0.5*10<-5> under the condition of random noise interference, and the measurement accuracy can achieve a value of 0.5*10<-6> under the condition of other interferences.

Description

technical field [0001] The invention relates to a method for measuring dielectric loss angle based on Nuttall window-five-point transformation. Background technique [0002] Capacitive equipment is an important part of power system equipment. If equipment failure occurs, it will affect the normal operation of the power system to a large extent. Most of the equipment failures of capacitive equipment are caused by insulation problems, so it is necessary to monitor their insulation status. The dielectric loss angle δ is one of the important parameters to characterize the insulation state of the equipment. By monitoring the dielectric loss angle of the equipment and analyzing the change trend of its insulation state, the insulation state of the equipment can be effectively judged. [0003] The software algorithm for dielectric loss angle monitoring is mainly represented by harmonic analysis method. Among the harmonic analysis methods, the FFT method is the most widely used me...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26
Inventor 金涛游胜强
Owner FUZHOU UNIV
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