Method and device for rapidly measuring dielectric loss angle based on time domain quasi-synchronization

Abstract

The invention discloses a method and device for rapidly measuring a dielectric loss angle based on time domain quasi-synchronization. The measuring method comprises the following steps of signal sampling, fundamental frequency estimation, reconstitution of a quasi-synchronization sampling sequence of sampled signals, frequency analysis based on the FFT, fundamental wave phase angle calculation and dielectric loss angle calculation. The measuring device comprises a power module. The power module is respectively and electrically connected with an analog-digital converter and a digital signal processor. The analog-digital converter is respectively connected with a voltage measurement signal converting circuit, a current measurement signal converting circuit and a standard reference voltage module. The analog-digital converter is connected with a digital signal processor through an SPI. The digital signal processor is electrically and respectively connected with a reset module, a debugging JTAG interface, a synchronization dynamic random access memory, an FLASH and an active crystal oscillator. According to the detecting method, rapid, accurate and stable measurement of the dielectric loss angle can be achieved, sampling time is short, the sampling data size is small, the algorithm is simple, operand is small, and an embedded system is easy to obtain. The measuring device is accurate in measurement.

Description

technical field [0001] The invention relates to a fast measurement method of dielectric loss angle based on time domain quasi-synchronization and a measurement device thereof. Background technique [0002] Dielectric loss angle (dielectric loss angle δ) is an important index to study the insulation aging performance of high-voltage capacitive equipment, and its change can reflect insulation defects such as moisture, deterioration or gas discharge in the insulator. With the development of power system on-line monitoring technology and digital signal processing technology, the high-accuracy dielectric loss angle measurement algorithm has attracted more and more attention. [0003] At present, the dielectric loss angle measurement can be realized by hardware circuit and digital signal processing technology. [0004] The hardware circuit method (such as zero-crossing comparison method and bridge balance method) has high accuracy, but has weak anti-interference ability and high ...

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Problems solved by technology

[0008] To sum up, the existing technology has the following defects: (1) The methods such as the orthogonal filtering method and the high-order sinusoidal fitting method are complex in algorithm and inefficient, and are not easy to implement in embedded systems; (2) The FFT algorithm is highly efficient However, due to the influence of asynchronous sampling, the FFT algorithm inevitably has spectrum leakage and fence effect; (3) Due to the spectrum leakage and fence effect, the FFT algorithm needs to use window The function and spectral line interpolation algorithm has the disadvantages of large amount of calculation, long sampling data time and large amount of data, and the algorithm is complex

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