Frequency sensitive filter

Abstract

The invention relates to a frequency-sensitive filter, belonging to the passive filter technique. A yoke is equipped on an iron pillar, the C-shaped part of the yoke is downward, the C-shaped part of the iron pillar is upward, the yoke and the iron pillar are respectively inserted in central holes of two skeletons, the end surface of the yoke is aligned with the end surface of the iron pillar; a gasket is arranged between the two end surfaces, an inductive capacitor is respectively coiled on two skeletons, the two ends of the pole plate of the inductive capacitor are respectively fixedly connected with a wire; the yoke and the iron pillar are fixed on a pedestal through a fixing strap by screw nuts; and the space between the two wires of the inductive capacitors simultaneously has capacitance and inductance therebetween to form a voltage resonance circuit. The inductance of the frequency-sensitive filter can be regulated by changing the thickness of the gasket, so as to change the resonant frequency to meet the filtering requirement. The invention has the advantages of simple structure, small volume, high efficiency, low loss, wide filtering range, and low cost; and is particularly suitable for filtering and compensating under the rapid change of the harmonic wave content in a power grid, and can effectively eliminate harmonic wave and clean power grid environment.

Description

technical field [0001] The invention belongs to passive filter technology, in particular to a frequency-sensitive filter. Background technique [0002] The sine wave with a frequency of 50Hz for industrial AC power is called the fundamental wave. Due to the extensive use of power electronic devices, the output voltage or current waveform is a non-sinusoidal wave during operation, which can be decomposed into a fundamental wave and a synthesis of many harmonics by Fourier series, and the frequency of the harmonic is an integer multiple of the fundamental frequency . Harmonics destroy the normal working conditions of electrical equipment and cause pollution to the power grid, which must be dealt with. The way to deal with it is to use filtering technology to filter it out. Filtering technology is divided into two categories: active filtering technology and passive filtering technology. The general passive filter technology is composed of discrete components such as resistor...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a frequency-sensitive filter with simple structure, small size, wide filtering range and low cost in order to solve the technical problems of large volume, high cost and single filtering effect in existing passive filters. It is especially suitable for filtering and compensation in the environment where the harmonic content of the power grid changes rapidly, and can effectively filter out harmonics and purify the power grid environment

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