CN202939252U - Power quality recording analysis device - Google Patents
Power quality recording analysis device Download PDFInfo
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- CN202939252U CN202939252U CN 201220702852 CN201220702852U CN202939252U CN 202939252 U CN202939252 U CN 202939252U CN 201220702852 CN201220702852 CN 201220702852 CN 201220702852 U CN201220702852 U CN 201220702852U CN 202939252 U CN202939252 U CN 202939252U
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- 238000005516 engineering process Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 3
- 238000012545 processing Methods 0.000 description 14
- 238000012544 monitoring process Methods 0.000 description 6
- 239000000523 sample Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- FNMKZDDKPDBYJM-UHFFFAOYSA-N 3-(1,3-benzodioxol-5-yl)-7-(3-methylbut-2-enoxy)chromen-4-one Chemical compound C1=C2OCOC2=CC(C2=COC=3C(C2=O)=CC=C(C=3)OCC=C(C)C)=C1 FNMKZDDKPDBYJM-UHFFFAOYSA-N 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000006399 behavior Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The utility model discloses a power quality recording analysis device. The device comprises a voltage and current acquisition device, a voltage transformer, an analog-digital conversion module and a power quality recording analysis unit which are successively connected with each other. The voltage and current acquisition device comprises a voltage acquisition device and a current acquisition device which converts a collected current signal into a voltage signal. According to the utility model, based on a virtual equipment technology, the device does not depend on a standard table measuring power value, can flexibly analyze the power quality and is portable. By using the device, appearance of an on-site condition in a laboratory is convenient. A standardized measuring method is provided for metering an electric energy meter.
Description
Technical field
The utility model relates to a kind of quality of power supply record analysis device.
Background technology
Along with the develop rapidly of modern science and technology, high voltage, the jumbo impact equipment such as electric arc furnaces, comminutor, rolling mill, electric traction machine, electric vehicle rapid charging equipment and electric railway are used widely in recent years.The application of this kind equipment easily causes load to alter a great deal suddenly, generally occurs that the time of peak load is very short, but its peak value may be several times or the decades of times of its average load.When the variation amplitude is larger with respect to power system capacity, probably cause the continuous oscillation of system frequency, voltage swing, not only make that the various pollutions of electric system are day by day serious, the quality of power supply is also increasingly deteriorated, and there are the complex characteristics such as serious power rush, three-phase equilibrium, harmonic wave, a harmonic wave, voltage and electric current drastic change due to this kind equipment, make and adopt the electric energy measurement instrument designed based on sinusoidal current Power Theory or traditional Nonsinusoidal Circuits Power Theory all can not reflect really the electric energy that the user uses, thereby directly affect the accuracy of electric energy metrical.
The utility model content
The utility model is for solving the problems of the technologies described above, a kind of quality of power supply record analysis device is provided, it is based on the virtual unit technology, do not rely on standard scale metering energy value, can to the quality of power supply, be analyzed flexibly, be convenient for carrying, be convenient in laboratory, field condition be appeared in one's mind, to the metering of electric energy meter, provide a kind of Standardized Measuring Methods.
To achieve these goals, the utility model adopts following technical scheme.
A kind of quality of power supply record analysis device, comprise successively connected electric current and voltage collecting device, voltage transformer (VT), analog-to-digital conversion module and quality of power supply record analysis unit, described electric current and voltage collecting device comprises voltage acquisition equipment, the current signal of collection is converted to the current acquisition equipment of voltage signal.
Quality of power supply record analysis unit is dsp chip.
Basic thought of the present utility model is decomposed the signal waveform obtained and quantized, and then in order the amplitude of waveform is deposited in storer with numerical information.During work, can be transformed into analog quantity through D/A converter module again with the identical amplitude information that takes out in turn, export the waveform that we wish to get.
Its course of work is: the electric current and voltage collecting device collects the electric current and voltage value from circuit; The electric current and voltage collecting device is by impedance conversion and voltage transformer (VT), current value is changed into to magnitude of voltage and carries out the multiple convergent-divergent, and the electric current and voltage value collected is divided into to two paths sends quality of power supply record analysis unit to, quality of power supply record analysis unit carries out the analyzing and processing of the quality of power supply, and records the stored waveform file.
The beneficial effects of the utility model: based on the virtual unit technology, do not rely on standard scale metering energy value, can be analyzed the quality of power supply flexibly, be convenient for carrying, be convenient in laboratory, field condition be appeared in one's mind, to the metering of electric energy meter, provide a kind of Standardized Measuring Methods.
The accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the structural representation of quality of power supply record analysis unit.
Fig. 3 is the buffering schematic diagram.
Wherein, 1, need the circuit that gathers; 2, electric current and voltage collecting device; 3, voltage transformer (VT); 4, analog-to-digital conversion module; 5, quality of power supply record analysis unit; 6, parameter configuration unit; 7, data read and processing unit; 8, store initialization unit; 9, file storage unit; 10, emergency mechanism unit; 11, monitoring means; 12, reading unit; 13, data processing unit; 14, internal memory.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail.
As shown in Figure 1, the quality of power supply record analysis device of the present embodiment, comprise successively connected electric current and voltage collecting device 2, voltage transformer (VT) 3, analog-to-digital conversion module 4 and quality of power supply record analysis unit 5.
Described electric current and voltage collecting device 2, be to form in quality of power supply record analysis unit 5 with between the circuit 1 that needs to gather the equipment that physical connection is connected with electrical equipment, is first link in chain tape.If probe deficiency or detection method are bad, cause first link to become weak, will weaken whole chain so.Therefore, probe must reach minimum to the circuit impact of surveying, and the measurement of hope is kept to enough signal fidelities.
Described electric current and voltage collecting device 2 comprises voltage acquisition equipment, the current signal of collection is converted to the current acquisition equipment of voltage signal.
Voltage acquisition equipment adopts the oscilloprobe with 100X attenuation coefficient, the magnitude of voltage collected can be dwindled to 100 times, and this probe adopts the NBC probe, can send scale information to receiving trap, thereby correctly transmit amplitude information accurately.
Current acquisition equipment can adopt current probe to obtain the electric current in transducer wire, and the current signal sensed is converted to corresponding voltage signal.
Described voltage transformer (VT) 3, realize that electrical isolation and multiplying power change, and 3 kinds of no-load voltage ratio conversion 220V: 2.2V, 100V: 2V, 60V: 2V can be arranged.
Described analog-to-digital conversion module 4 is digital signal by analog signal conversion.
As shown in Figure 2, described quality of power supply record analysis unit 5 is dsp chip, comprising: parameter configuration unit 6, data read and processing unit 7, store initialization unit 8, file storage unit 9, emergency mechanism unit 10 and internal memory 14; Analog-to-digital conversion module is connected with 4 parameter configuration unit 6; Parameter configuration unit 6 reads with data and processing unit 7 is connected; Data read and processing unit 7 is connected with store initialization unit 13 by internal memory 14, and store initialization unit 13 is connected with file storage unit 12; Data read and processing unit 7 is connected with emergency mechanism unit 10; Data read and processing unit 7 comprises reading unit 12, monitoring means 11 and data processing unit 13.
2 minutes two-way of electric current and voltage collecting device are measured, the first via gathers magnitude of voltage, the second tunnel gathers current value, by impedance conversion, current acquisition is changed into to voltage acquisition, through impedance conversion, utilizing voltage transformer (VT) 3 that measurement range is reduced simultaneously, carry out the hyperchannel configuration in parameter configuration unit, change the arrangement mode of high speed acquisition device memory.
In parameter configuration unit 6, the triggering mode that has comprised equipment, channel selecting, acquisition rate, measurement range, coupling scheme, impedance magnitude are selected.Triggering mode comprises rising edge to be triggered and the negative edge triggering; Hyperchannel is selected reading and storing for high speed acquisition device memory arrangement mode; Acquisition rate can arrange as required voluntarily; Coupling scheme have direct current and exchange two kinds; Impedance magnitude can be selected two kinds of 50 Ω and 1M Ω, coupling different measuring condition.
In store initialization unit 8, specified the disk storage zone, storage mode, and judge and obtain wave recording length by time marking.As shown in Figure 3, the value that wherein time marking deducts the current time by the test concluding time is multiplied by sampling rate and reads the value that several business obtains at every turn and send in monitoring means.
Data read and processing unit 7 comprises monitoring means 11, reading unit 12 and data processing unit 13.
Monitoring means 11 is responsible for the monitoring objective data volume and whether is reached desired value.
(1) effective value
Because the waveform collected is non-sinusoidal wave, therefore according to the real effective formula, calculated.
According to the real available value of voltage computing formula:
The root mean square that gets contact potential series obtains voltage effective value.
U is real available value of voltage.
U
1, U
2, U
3, U
nThe voltage of getting for each point.
N is counting of getting.
Collecting device changes into magnitude of voltage by impedance transformation by current value, again the value obtained is multiplied by no-load voltage ratio at processing unit and obtains current values.
Again according to formula
Obtain current effective value, try to achieve analog value and show on the program panel.
I is current effective value.
I
1, I
2, I
3, I
nThe electric current of getting for each point.
N is counting of getting.
(2) applied power, active power, phasor power factor, power factor are tried to achieve analog value according to following formula.
Applied power: S=U
rms* I
rms.
S is applied power.
U
rmsFor voltage effective value.
I
rmsFor current effective value.
Active power:
P is active power.
T is the sampling time.
U (t) is instantaneous voltage.
I (t) is momentary current.
Phasor power factor: DPF=COS φ.
Cos φ, be phase shift factor, or be phasor power factor.
Power factor:
λ is power factor.
P is active power.
S is applied power.
User for 0.9 standard:
As actual power factor is 0.65, month electricity charge increase by 15%.
As actual power factor is more than 0.95, month electricity charge reduce 0.75%.
(3) maximin
Rule according to the array comparison is obtained maximin and corresponding time to n dimension group by array indexing.
(4) frequency
The fundamental frequency formula:
N is the complete cycle number in 10 seconds, and T is the complete cycle time.
Waveform is calculated by the FFT with the Hanning window, then extract single-frequency information from the Hann frequency spectrum, obtain frequency.
As shown in Figure 3, data read and processing unit 7 and file storage unit 9 between rely on the buffering of internal memory 14 to be connected, be about to memory headroom and be divided into sectional space, can realize the playback of appearing in one's mind of real time data, the unmatched problem of speed while having solved the high speed signal sampling.
Although above-mentioned, by reference to the accompanying drawings embodiment of the present utility model is described; but be not the restriction to the utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection domain of the present utility model.
Claims (2)
1. a quality of power supply record analysis device, it is characterized in that, comprise successively connected electric current and voltage collecting device, voltage transformer (VT), analog-to-digital conversion module, quality of power supply record analysis unit, described electric current and voltage collecting device comprises voltage acquisition equipment, the current signal of collection is converted to the current acquisition equipment of voltage signal.
2. quality of power supply record analysis device as claimed in claim 1, is characterized in that, quality of power supply record analysis unit is dsp chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220702852 CN202939252U (en) | 2012-12-18 | 2012-12-18 | Power quality recording analysis device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220702852 CN202939252U (en) | 2012-12-18 | 2012-12-18 | Power quality recording analysis device |
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| CN202939252U true CN202939252U (en) | 2013-05-15 |
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| CN 201220702852 Expired - Lifetime CN202939252U (en) | 2012-12-18 | 2012-12-18 | Power quality recording analysis device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104655922A (en) * | 2013-11-20 | 2015-05-27 | 江南大学 | Vicious load judging system based on voltage and current sampling data |
| CN105954624A (en) * | 2016-06-17 | 2016-09-21 | 丰郅(上海)新能源科技有限公司 | Detection device |
| CN107358544A (en) * | 2017-07-17 | 2017-11-17 | 南京亚派软件技术有限公司 | A kind of method for realizing energy management virtual unit |
| CN110007137A (en) * | 2019-05-06 | 2019-07-12 | 国网四川省电力公司电力科学研究院 | A kind of intelligent electric energy meter merging multiple terminal monitoring function |
-
2012
- 2012-12-18 CN CN 201220702852 patent/CN202939252U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104655922A (en) * | 2013-11-20 | 2015-05-27 | 江南大学 | Vicious load judging system based on voltage and current sampling data |
| CN105954624A (en) * | 2016-06-17 | 2016-09-21 | 丰郅(上海)新能源科技有限公司 | Detection device |
| CN107358544A (en) * | 2017-07-17 | 2017-11-17 | 南京亚派软件技术有限公司 | A kind of method for realizing energy management virtual unit |
| CN110007137A (en) * | 2019-05-06 | 2019-07-12 | 国网四川省电力公司电力科学研究院 | A kind of intelligent electric energy meter merging multiple terminal monitoring function |
| CN110007137B (en) * | 2019-05-06 | 2022-02-01 | 国网四川省电力公司电力科学研究院 | Intelligent electric energy meter integrating multiple terminal monitoring functions |
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