Calculation method of dielectric power factors of high-voltage electrical equipment

Abstract

The invention discloses a calculation method of dielectric power factors of high-voltage electrical equipment. The method comprises that first direct current components of voltage and current signals are eliminated within the time domain, then fundamental frequency of electrical signals is accurately calculated according to the energy moment theory, then the primary signals are calculated in an interpolation mode according to a three-bending moment method, and complete alternation resampling is conducted, and last, the sample length of complete alternation is fast calculated in a Fourier mode to acquire phase included angles of fundamental wave voltage and fundamental wave current, tangents of other angles are acquired, and the dielectric power factors are acquired. The calculation method of the dielectric power factors of the high-voltage electrical equipment has the advantages of being not only capable of achieving accurate calculation of the dielectric power factors of the high-voltage electrical equipment, but also capable of accurately acquiring phase included angles between subharmonics of voltage and current signals, and detecting quality of electric energy by accurately measuring quality of the electric energy of the electrical signals.

Description

technical field [0001] The invention belongs to the technical field of data processing. Specifically, it is a calculation method for the dielectric loss factor of high-voltage electrical equipment. Background technique [0002] Dielectric loss factor (tanδ) is an important index to characterize the insulation condition of high-voltage electrical equipment. Among them, δ refers to the dielectric loss angle, which is the complementary angle between the current vector and the voltage vector flowing in the dielectric under the alternating electric field, referred to as the dielectric loss angle. [0003] At present, the measurement of dielectric loss angle can be divided into hardware method and software method. Hardware methods mainly include zero-crossing comparison method, bridge balance method, etc. These methods have the disadvantages of many hardware processing links, poor anti-interference ability, and large cumulative error, which are difficult to meet the accuracy of ...

AI Technical Summary

Problems solved by technology

However, under asynchronous sampling, the ability of the cosine combination window to suppress spectrum leakage is limited, and the true value of the dielectric loss angle is easily covered by the spectrum leakage and fence effect. The contradiction between the main lobe width and side lobe height of the window also restricts the accuracy of the calculation.

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