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Three-phase five-wire system harmonic protector

A harmonic protector, three-phase five-wire technology, applied to harmonic reduction devices, AC networks to reduce harmonics/ripples, etc., can solve problems such as interference, achieve strong elimination capabilities, high work efficiency, and easy installation Effect

Active Publication Date: 2014-04-02
SHENGLONG ELECTRIC
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Problems solved by technology

[0004] Aiming at the deficiencies of the existing technology, the present invention proposes a three-phase five-wire harmonic protection system that can effectively suppress the high-order harmonics generated by electrical equipment and provide harmonic protection for electrical equipment in low-voltage power distribution systems. The purpose is to solve the problem of high-frequency harmonic interference in the power distribution system and reduce the harm caused by high-frequency harmonics to electrical equipment, especially precision loads

Method used

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  • Three-phase five-wire system harmonic protector

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with accompanying drawing.

[0021] figure 1 It is a structural schematic diagram of the three-phase five-wire harmonic protector of the present invention. Such as figure 1 As shown, the three-phase five-wire harmonic protector disclosed by the present invention. The invention uses a surge protection circuit and a high-frequency filter circuit. The surge protection circuit includes a fuse, a piezoresistor and a gas discharge tube; the filter circuit includes a reactor and two capacitors.

[0022] figure 1 In the shown circuit, the varistors RVa, RVb, and RVc of the three-phase lines A, B, and C are respectively connected in series with the discharge tube GDT to protect the zero line PE to form a surge protection circuit. (The three-phase circuit shares a gas discharge tube, and the discharge Tube working voltage is 800V). This circuit can avoid the impact on the electrical equipment caused by the ...

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Abstract

The invention provides a three-phase five-wire system harmonic protector capable of effectively restraining higher harmonics generated in electric equipment and performing harmonic protection on the electric equipment in a low-voltage distribution system. The three-phase five-wire system harmonic protector is used for solving the problem of high-frequency harmonic interference in the distribution system, and reducing the harm of high-frequency harmonics to the electric equipment, particularly a precision load. The three-phase five-wire system harmonic protector comprises a shell and a harmonic protection circuit installed in the shell. The harmonic protection circuit comprises A phase, B phase and C phase surge protection circuits and A phase, B phase and C phase high-frequency filter circuits.

Description

technical field [0001] The invention relates to a harmonic protector, in particular to a three-phase five-wire harmonic protector. Background technique [0002] Harmonics are an important indicator of power quality. When a sine wave voltage is applied to a nonlinear load circuit, the current becomes a non-sinusoidal wave, and the non-sinusoidal current produces a voltage drop on the grid impedance, which makes the voltage waveform also become a non-sinusoidal wave. Do Fourier series decomposition of non-sine waves, in which the components with the same power frequency in the frequency domain are called fundamental waves, and the components with frequencies greater than the fundamental waves are called harmonics. Harmonic current has many adverse effects on various key equipment and power efficiency of the user's power consumption system, including the two key indicators of power factor and three-phase unbalance. [0003] With the rapid development of power electronics tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 袁志钢谢洪潮
Owner SHENGLONG ELECTRIC
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