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Filter circuit of grounding power frequency current of iron core

A technology of power frequency current and filter circuit, which is applied in the field of circuits to achieve the effects of improving accuracy, suppressing interference and flexible application.

Inactive Publication Date: 2019-12-13
上海锐开电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country's power supply and distribution uniformly use 50Hz frequency alternating current. When collecting, processing and analyzing electrical signals, the interference of 50Hz power frequency signals cannot be avoided.

Method used

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  • Filter circuit of grounding power frequency current of iron core

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Embodiment Construction

[0010] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

[0011] see figure 1 As shown, the filtering circuit of the iron core grounding power frequency current of the present invention includes two mutually cascaded adjustable Q-value double-T active band-stop filter circuits 1, and the adjustable Q-value double-T active band-stop filter circuit 1 includes the first A resistor R1, a second resistor R2, a third resistor R3, a variable resistor Rw, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first operational amplifier U1 and a second operational amplifier U2, the first capacitor C1 , the second capacitor C2, and the negative input terminal of the first operational amplifier U1 are sequentially connected in series; the first resistor R1, the second resistor R2, and the negative input terminal of the first operational amplifier U...

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Abstract

The invention discloses a filter circuit of a grounding power frequency current of an iron core. A Q-value-adjustable double-T active band elimination filter circuit with filtering, amplifying, feedback and adjusting functions is adopted; on the basis of the active band elimination filter circuit, an operational amplifier U2 with a feedback function and a potentiometer with an adjusting function are added; the potentiometer has the function of adjusting the quality factor Q of the circuit, and two independent Q-value-adjustable double-T active band elimination filter circuits with narrow-bandstop band center frequencies of 50 Hz and 100 Hz are designed for 50 Hz power frequency and second harmonic thereof. Interference generated by 50Hz power frequency and harmonic waves of the 50Hz powerfrequency can be filtered out, and the precision of measured electric signals is improved; the circuit can be adjusted at will according to circuit requirements in application, so the application ismore flexible; and the designed circuit can be widely applied to the aspects of low-frequency signal information processing, data transmission, interference suppression and the like.

Description

technical field [0001] The invention belongs to the technical field of circuits, and relates to a band-stop filter circuit for filtering power frequency interference, which is used for monitoring the iron core grounding current of a power transformer in the power industry, and in particular to a filter circuit for iron core grounding power frequency current. Background technique [0002] A circuit that is selective to the frequency of the signal is called a filter circuit. It can pass signals within a specific frequency range and prevent signals outside this frequency range from passing. According to the frequency of the passband, it can be divided into low-pass (LPF), High-pass (HPF), band-pass (BPF) and band-stop (BEF) filter circuits can be divided into active filters and passive filters according to whether there are active components in the filter circuit. Passive filtering is through the inductor Matching with the capacitor forms a low-impedance path for a certain harm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G01R1/30G01R23/165
CPCG01R1/30G01R23/165
Inventor 马焓
Owner 上海锐开电气有限公司