CN204241565U - Harmonic monitor of electric network - Google Patents
Harmonic monitor of electric network Download PDFInfo
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- CN204241565U CN204241565U CN201420575484.8U CN201420575484U CN204241565U CN 204241565 U CN204241565 U CN 204241565U CN 201420575484 U CN201420575484 U CN 201420575484U CN 204241565 U CN204241565 U CN 204241565U
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- 238000004458 analytical method Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 238000005070 sampling Methods 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 208000033999 Device damage Diseases 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
The utility model discloses a kind of harmonic monitor of electric network, comprise voltage/current pre-process circuit, harmonic wave sample circuit, frequency analysis circuit and display circuit for alarming, it is characterized in that, also comprise time domain/frequency domain translation circuit; Line voltage and current signal are after the decay of voltage/current pre-process circuit, enter harmonic wave sample circuit, sampled result enters time domain/frequency domain translation circuit and becomes frequency signal by time signal, and frequency signal enters frequency analysis circuit analysis, and analysis result enters display circuit for alarming.The utility model carries out round-the-clock monitoring to the frequency of substation bus bar or low voltage electric network, harmonic wave, voltage, electric current, power factor (PF), positive-negative sequence voltage, positive-negative sequence current, degree of unbalancedness, idle, meritorious, the information such as active electrical degree, idle electric degree, there is provided foundation for grasping power grid quality, electric network reconstruction and power network harmonic wave management comprehensively, measuring accuracy is high, good reliability.
Description
Technical field
The utility model relates to a kind of Detecting Power Harmonics equipment, specifically a kind of harmonic monitor of electric network, belongs to power network harmonic wave management field.
Background technology
The desirable voltage of electric system, current waveform are sinusoidal wave.But owing to there is various nonlinear element in electric system, make voltage and current waveform that distortion occur and produce harmonic wave.Harmonic wave can cause that the power attenuation of electrical network increases, shortened equipment life, defencive function are not normal, also can cause transformer station's local parallel or series resonance, cause the device damage such as voltage transformer (VT).Current harmonic wave and electromagnetic interference (EMI), power factor reduce by the three large public hazards being listed as electric system, therefore, should monitor mains by harmonics situation at any time and process in time, guarantee power supply safety as electrical production and electric power supply department.
Summary of the invention
The utility model object is the harmonic monitor of electric network providing a kind of energy Real-Time Monitoring mains by harmonics.
For achieving the above object, a kind of harmonic monitor of electric network of the utility model, comprises voltage/current pre-process circuit, harmonic wave sample circuit, time domain/frequency domain translation circuit, frequency analysis circuit and display circuit for alarming;
Voltage/current pre-process circuit is by after line voltage and current signal decay, send harmonic wave sampling circuit samples, sampling is become frequency signal by time signal by time domain/frequency domain translation circuit, frequency analysis circuit is analyzed frequency signal, and send display circuit for alarming by analysis result, the power component of real-time each Frequency point of display mains by harmonics, sends a warning when the power component for abnormal Frequency point is greater than fence coverage.
Frequency analysis circuit is made up of single-chip microcomputer and peripheral circuit, analyze and completed by computer software, analyze content and comprise the frequency of electrical network, harmonic wave, voltage, electric current, power factor (PF), positive-negative sequence voltage, positive-negative sequence current, degree of unbalancedness, idle, meritorious, active electrical degree, idle electric degree etc.
A kind of harmonic monitor of electric network energy of the utility model Real-Time Monitoring mains by harmonics, round-the-clock monitoring is carried out to the frequency of substation bus bar or low voltage electric network, harmonic wave, voltage, electric current, power factor (PF), positive-negative sequence voltage, positive-negative sequence current, degree of unbalancedness, idle, meritorious, the information such as active electrical degree, idle electric degree, there is provided foundation for grasping power grid quality, electric network reconstruction and power network harmonic wave management comprehensively, measuring accuracy is high, good reliability.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figure 1, a kind of harmonic monitor of electric network, comprises voltage/current pre-process circuit, harmonic wave sample circuit, time domain/frequency domain translation circuit, frequency analysis circuit and display circuit for alarming;
Voltage/current pre-process circuit is by after line voltage and current signal decay, send harmonic wave sampling circuit samples, sampling is become frequency signal by time signal by time domain/frequency domain translation circuit, frequency analysis circuit is analyzed frequency signal, and send display circuit for alarming by analysis result, the power component of real-time each Frequency point of display mains by harmonics, sends a warning when the power component for abnormal Frequency point is greater than fence coverage.
Frequency analysis circuit is made up of single-chip microcomputer and peripheral circuit, analyze and completed by computer software, analyze content and comprise the frequency of electrical network, harmonic wave, voltage, electric current, power factor (PF), positive-negative sequence voltage, positive-negative sequence current, degree of unbalancedness, idle, meritorious, active electrical degree, idle electric degree etc.
Time domain/frequency domain translation circuit adopts Fourier transformer, can measure multiple loop simultaneously, can measure by self-timing.For power department for managerial demand, obtain the content of each harmonic and the detection carried out is very applicable.
Further, for alleviating the work load of time domain/frequency domain translation circuit, frequency analysis circuit, between voltage/current pre-process circuit and harmonic wave sample circuit, also rejection filter is provided with.This rejection filter blocks passing through of normal harmonic signal, only allows improper harmonic signal to pass through, and subsequent conditioning circuit only converts improper harmonic wave, analyze and shows.
Claims (3)
1. a harmonic monitor of electric network, comprises voltage/current pre-process circuit, harmonic wave sample circuit, frequency analysis circuit and display circuit for alarming, it is characterized in that, also comprise time domain/frequency domain translation circuit;
Line voltage and current signal are after the decay of voltage/current pre-process circuit, enter harmonic wave sample circuit, sampled result enters time domain/frequency domain translation circuit and becomes frequency signal by time signal, and frequency signal enters frequency analysis circuit analysis, and analysis result enters display circuit for alarming.
2. a kind of harmonic monitor of electric network according to claim 1, is characterized in that, described time domain/frequency domain translation circuit adopts Fourier transformer.
3. a kind of harmonic monitor of electric network according to claim 1 and 2, is characterized in that, also comprise rejection filter, and described rejection filter is connected on and comprises between voltage/current pre-process circuit and harmonic wave sample circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420575484.8U CN204241565U (en) | 2014-10-08 | 2014-10-08 | Harmonic monitor of electric network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420575484.8U CN204241565U (en) | 2014-10-08 | 2014-10-08 | Harmonic monitor of electric network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204241565U true CN204241565U (en) | 2015-04-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420575484.8U Active CN204241565U (en) | 2014-10-08 | 2014-10-08 | Harmonic monitor of electric network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204241565U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104330626A (en) * | 2014-10-08 | 2015-02-04 | 国家电网公司 | Power grid harmonic wave monitor |
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2014
- 2014-10-08 CN CN201420575484.8U patent/CN204241565U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104330626A (en) * | 2014-10-08 | 2015-02-04 | 国家电网公司 | Power grid harmonic wave monitor |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |