CN204116455U - Electric system variable voltage variable frequency harmonic frequency table - Google Patents
Electric system variable voltage variable frequency harmonic frequency table Download PDFInfo
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- CN204116455U CN204116455U CN201420062249.0U CN201420062249U CN204116455U CN 204116455 U CN204116455 U CN 204116455U CN 201420062249 U CN201420062249 U CN 201420062249U CN 204116455 U CN204116455 U CN 204116455U
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Abstract
Measure the instrument of line voltage wave mode parameter and frequency: full name is an electric system variable voltage variable frequency harmonic frequency table, be called for short harmonic frequency table/Hough table.Its watchcase card has the adjustment of power switch, signal behavior, amplitude, double bond input and digital-scroll technique etc.Box, built with circuit board, is made up of recurrent pulse forming unit, filtering single polarization unit, AM unit, computer system, two button and nixie display etc.Carry out high-order lowpass filtering respectively by amplitude modulation, fundamental frequency frequency-division section multichannel/multichannel process, multi-channel sampling signal, the amplitude of tested voltage and frequency allow wide variation, and no-load voltage ratio is more than 7.Instrument measurement overtone order can reach 99 times.Precision 1 grade and more than.Simple to operate, energy-conserving and environment-protective.
Description
One, technical field
Full name of the present utility model is electric system variable voltage variable frequency harmonic frequency table.Be called for short harmonic frequency table (Harmonic & Frequency Meter) and Hough table (HARF Meter).The utility model belongs to a kind of electric system electric instrument.Be related specifically to the waveform parameter of the voltage of power system voltage amplitude and frequency wide variation and the measurement instrument of frequency.
Here frequency refers to the fundamental frequency of tested voltage.Waveform parameter comprises wave form distortion and harmonic wave total amount and each overtone order and harmonic content thereof.
Two, background technology
It is carry out under condition near ratings that existing DIGITAL FREQUENCY table, harmonic meter and integrated form instrument are only limitted to voltage magnitude and frequency, and the overtone order measured is failed more than 50 times.Growing with under applicable cases in power electronics converter technique, can not meet the demands.
Three, summary of the invention
The purpose of this utility model will expand instrument measurement scope exactly.The ratio of the amplitude of tested voltage and the permission variation range of frequency and the high and low value of amplitude and the ratio of the high and low value of frequency are all more than 7.Overtone order measurement range is 2 ~ 99 times.Except the direct input end of voltage, also have the signal voltage input end of the 0.5V ~ 5V after test signal/other voltage, current transformation selective.
The utility model adopts following technical scheme to reach described object, see accompanying drawing 1 He
Fig. 2:
1, before computer system sampling, carry out voltage amplitude/peak value to the measured signal voltage of sampling to regulate; Sampled voltage is no more than reference voltage, is also not less than the reference voltage of 85%.Signal voltage presses fundamental frequency frequency-division section multichannel/multichannel process, expands frequency range.Frequency-division section produces multichannel recurrent pulse accurately and reliably.Measured signal voltage before sampling frequency-division section carries out the filtering of simulation high-order lowpass, and filtered multiple signals voltage is sampled respectively by entering computing machine entrance after single polarization.
2, in box body, circuit board composition body is filled with.Box surface element has 8 Digital sum displays, power knob switch, have the operation by automatic measurement and display in turn by tested line voltage and the signal voltage selector switch of left-to-right placement., amplitude potentiometer adjusting knob and bi-colour LED and dual input button and record look pilot lamp, also have reset button.There is junction block at the back side of box body, comprises instrument power input, the input of tested line voltage and the input of external 0.5V ~ 5V signal voltage.
3, circuit board group zoarium forms ∏ font assembly by three pieces of circuit boards.Appliance circuit is made up of voltage sensor unit, signal voltage selection unit, recurrent pulse forming unit, filtering single polarization unit, AM unit, computer system/single-chip microcomputer, double bond input and display unit.With reference to accompanying drawing 2, tested line voltage enters voltage sensor from 1 and 2 ends, enters 1 end of signal voltage selector switch after being transformed to the 0.5V ~ 5V signal voltage that can survey from 3 ends; External 0.5V ~ 5V signal voltage directly enters 2 ends of signal voltage selector switch; 1 end that selected signal voltage outputs to amplitude modulation potentiometer from 3 ends exports from 2 ends after amplitude modulation, and one side enters 1 end of recurrent pulse forming unit, and the recurrent pulse of formation outputs to 1 end of computer system from 2 ends; 1 end of one side entering signal filtering and single polarization unit, the signal voltage after filtering process, 2 ends entering computer system unit from 2 ends after one side single polarization are sampled; After 3 ends outputs, enter 1 end of signal amplitude regulon on the other hand, compare with the amplitude adjusting reference voltage of 2 ends, produce driving voltage outputs to signal amplitude regulator potentiometer pilot lamp 4 and 5 ends from 3 ends and 4 ends, pilot lamp is shown on request.From double bond 1 end output order to computer system 4 end.Computer system carries out sampling and computing according to instruction, and result outputs to 1 end of display from 3 ends, display measurement result.
4, instrument operation has automatic measurement and display and checks each individual event result and store main result two kinds.The sequence of operation of automatic measurement and display is: select measured, regulate letter width, then double-click left button.Check that each individual event result with the sequence of operation storing main result is: double-click right button, input individual event code, then double-click right button.During input code, left button is position shift key.Right button is digital increments enter key.Hommization easy to remember simple to operate.
Double-click left button, Hough table just starts automatically to measure and show.First main result is shown: order is frequency, harmonic wave total amount, maximum three odd harmonic numbers and harmonic content thereof and maximum three even-order harmonic numbers and harmonic contents thereof during display.Overtone order and the harmonic content of each harmonic wave is shown again one by one by the order that overtone order is ascending.Until overtone order is that 99 displays are complete, terminates display and get back to economize on electricity waiting status.Click or press the conversion that right button can accelerate to show.Display can be stopped to get back to economize on electricity waiting status by reset key.LED digital-scroll technique is highlighted, hommization.
5, the box body of power system voltage harmonic frequency table is fixed on electric cabinet faceplate so that double card is embedded.For the regulator cubicle of existing frequency meter, harmonic frequency table replaces primary frequency table position and places, and need not change other structure.Hough table stands up, and can make desk-top table and use.Table contour dimension is about 100mm*100mm*110mm.
Four, accompanying drawing explanation
1, accompanying drawing 1 is Hough watchcase surface arrangements of elements figure.
Element has 8 Digital sum displays, power knob switch, by operation in turn by tested line voltage and the signal voltage selector switch of left-to-right placement., amplitude potentiometer adjusting knob and bi-colour LED, dual input button and record look pilot lamp.Left button is automatic measurement and display key, right button is individual event inquiry and access button.Also has reset button.
2, accompanying drawing 2 is the circuit theory diagrams of Hough table.
By signal voltage selection unit, recurrent pulse forming unit, filtering single polarization unit, AM unit, computer system/single-chip microcomputer, double bond inputs and display unit forms.
Five, embodiment
1, the power knob switch of Fig. 1 is used for powered-down after instrument measurement.
Signal voltage selector switch can expand measured usable range.
The measured signal voltage of amplitude modulation knob to sampling carries out voltage amplitude/peak value and regulates.Conditioning signal voltage in best codomain, and has lamplight pointing.
Double bond input and instruction.Left button is automatic measurement and display key, is called for short and surveys aobvious key.Right button is that the display of individual event result queries and main testing result store, and is called for short to look into and deposits key.
Now use 8 high-brightness LED numeral method.
Whenever press reset key, Hough table all will get back to initial point.Enter energy-saving mode after five seconds, at this moment only show a dynamic point.Reset operation does not affect the current testing result in single-chip microcomputer storer.
There is junction block at the back side of box body, comprises instrument power input, the input of tested line voltage and the input of external 0.5V ~ 5V signal voltage.
2, according to Fig. 2 circuit, through electric resistance partial pressure type voltage sensor, it is laggard to signal voltage selector switch that tested line voltage is transformed to the 0.5V ~ 5V signal voltage that can survey.
External 0.5V ~ 5V signal voltage directly enters signal voltage selector switch.
After selected signal voltage amplitude modulation, one side enters recurrent pulse forming unit, and the recurrent pulse of formation outputs to computer system; One side entering signal filtering and single polarization unit.Signal voltage after filtering process, after single polarization, enter computer system unit on the one hand to sample, entering signal amplitude regulon on the other hand, compare with amplitude adjusting reference voltage, produce driving voltage is added to signal amplitude regulator potentiometer and pilot lamp 4 and 5 ends from 3 ends and 4 ends, pilot lamp is indicated on request.
Computer system/single-chip microcomputer will meet speed and request memory.There is the independent completion software meeting multiple observing and controlling function, program self-checking function, electricity-saving function etc.There is double bond to input and indicate and operate.By 8 high-brightness LED number implement display measurement results.
3, the utility model Hough watch series has two profiles number: one for specified type (HFP_N), the amplitude of tested voltage and frequency be power frequency ± 10%; One is frequency conversion type (HFP_X).There are two kinds of specifications: be rated frequency be respectively 50Hz and 60Hz.Take power frequency as the frequency conversion type (HPF_22X5) of 50Hz be example, tested electric voltage frequency allows variation range to be 7Hz ~ 51Hz, and voltage magnitude allows variation range to be 30V ~ 250V.
To whole model specification, overtone order measurement range is 2 ~ 99 times.The measuring accuracy of frequency is 1 grade.The measuring accuracy of harmonic wave total amount is 1 grade.Harmonic value precision: be 0.5 grade for 2 ~ 49 times, is 1 grade for 50 ~ 99 times.Harmonic value range is 0.1 ~ 200%.The utility model considers energy-conserving and environment-protective and human oriented design requirement.
4, below in conjunction with accompanying drawing, and for HFP_22X5 type Hough table, the present invention is further elaborated.HFP_22X5 divides two frequency range two path channels to process.Adopt Chebyshev filter and PIC18F25 single-chip microcomputer.
Tested voltage is transformed into through electric resistance partial pressure voltage sensor can survey 1 end that signal voltage outputs to selector switch.0.5V ~ 5V signal voltage directly enters 2 ends of selector switch.Selected signal voltage is added to 1 end of amplitude potentiometer.Adjusting knob on damper box face, changes the output voltage size of potentiometer, makes bi-colour LED turn green.At this moment the signal voltage of 2 ends outputs is namely in OK range.The signal voltage one side mixed up enters 1 end of recurrent pulse forming unit, 1 end of one side entering signal filtering and single polarization unit.After entering recurrent pulse forming unit, a point two-way carries out filtering process respectively, then produces recurrent pulse through comparer.Recurrent pulse exports 1 end entering computer system from 2 ends.
The signal voltage of entering signal filtering and single polarization unit divides two-way first to carry out high-order low-pass filter filtering.The filtered signal voltage of two-way outputs to 1 end of signal amplitude regulon on the one hand from 3 ends, on the other hand respectively after single polarization process, output to 2 ends of computer system unit from 2 ends.The two-way filtering signal of 1 end of entering signal amplitude regulon becomes the envelope of the absolute value of each signal, compare with the amplitude reference voltage of 2 ends again, comparative result produces driving voltage is added to signal amplitude regulator potentiometer and pilot lamp 4 and 5 ends from 3 ends and 4 ends, and pilot lamp is shown on request.
The entrance 1 end input recurrent pulse of computer system/single machine unit.2 end input sample signal voltages.4 end input key instructions.3 ends are the communication interface with display programmable driver, output display and control information.Computer system/one-chip computer. can accurate Quick Acquisition signal voltage data and carry out computing, to obtain measurement result.
5, instrument Anxious does very simple: press Hough apparent source switch, connects instrument power, computer system starting and operational system software.Energy-conservation waiting status is entered after 5 seconds.Now display only shows a dynamic point randomly.Two kinds of basic operations are as follows:
1. measurement and display: select measured-adjustment letter width-double-click left button.
Select measured after, conditioning signal voltage magnitude adjusting knob, makes pilot lamp be green.Then double-click left button and namely survey aobvious key, Hough table just starts automatically to measure and show.Measurement result is stored in the random access memory of single-chip microcomputer.First main result is shown: order is frequency, harmonic wave total amount, maximum three odd harmonic numbers and harmonic content thereof and maximum three even-order harmonic numbers and harmonic contents thereof during result display.Overtone order and the harmonic content of each harmonic wave is shown again one by one by the order that overtone order is ascending.Until overtone order is that 99 displays are complete, get back to economize on electricity waiting status.Every shows 6 to 10 seconds.Click or press the conversion that right button can accelerate to show.
2. inquiry and access: double-click right button-input code-double-click right button.
Double-click right button namely to look into and deposit key and can check current measurement result in single-chip microcomputer random access memory.Main result in current measurement result can be stored in nonvolatile memory, also can check the result be stored in wherein.When checking, two individual event codes need be inputted.During input code, left button is position shift key.Right button is digital increments enter key.After input code, double-clicking right button can show result.
Claims (2)
1. full name of the present utility model is electric system variable voltage variable frequency harmonic frequency table, a kind of electric instrument of the waveform parameter and frequency for measuring power system voltage, it is carry out under condition near ratings that the measurement instrument of existing harmonic parameters and frequency is only limitted to voltage magnitude and frequency, measuring overtone order fails more than 50 times, this measurement instrument then allows amplitude and the frequency wide variation of tested voltage, and measurement overtone order reaches 99 times, it is characterized in that: in box body, be filled with circuit board composition body: circuit board group zoarium comprises voltage sensor unit, signal amplitude regulon, recurrent pulse forming unit, signal filtering and single polarization unit, computer system unit, two key-press input and display unit, make the peak value of sampled voltage be no more than reference voltage, also be not less than 85% of reference voltage by amplitude modulation, produce multichannel recurrent pulse and multichannel respectively through the sampled voltage of high-order lowpass filtering by the process of fundamental frequency frequency-division section multichannel, the amplitude of tested voltage and the permission variation range of frequency, namely the ratio of the ratio of amplitude height low value and frequency height low value all more than 7, the measurement range of overtone order is 2 ~ 99 times, there are line voltage and 0.5V ~ 5V signal voltage two measured input ends.
2. according to claim 1 said electric system variable voltage variable frequency harmonic frequency table, it is characterized in that: box body panel has power switch, signal voltage selector switch, signal amplitude regulate with pilot lamp, inputs pair button and pilot lamp and measurement result nixie display; By the operation of automatic measurement and display in turn by left-to-right placement signal voltage-selected switch., signal amplitude regulator potentiometer and the two button of input; Automatically measure display with two button, measurement result is stored in the operation that measurement result is checked in nonvolatile memory neutralization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420062249.0U CN204116455U (en) | 2014-02-08 | 2014-02-08 | Electric system variable voltage variable frequency harmonic frequency table |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420062249.0U CN204116455U (en) | 2014-02-08 | 2014-02-08 | Electric system variable voltage variable frequency harmonic frequency table |
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| CN204116455U true CN204116455U (en) | 2015-01-21 |
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| CN201420062249.0U Expired - Fee Related CN204116455U (en) | 2014-02-08 | 2014-02-08 | Electric system variable voltage variable frequency harmonic frequency table |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767174A (en) * | 2015-04-03 | 2015-07-08 | 邹中宝 | Miniature voltage transformation frequency measurement device |
| CN107769770A (en) * | 2017-11-13 | 2018-03-06 | 戴承萍 | A kind of digital medium-frequency discriminator |
-
2014
- 2014-02-08 CN CN201420062249.0U patent/CN204116455U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767174A (en) * | 2015-04-03 | 2015-07-08 | 邹中宝 | Miniature voltage transformation frequency measurement device |
| CN107769770A (en) * | 2017-11-13 | 2018-03-06 | 戴承萍 | A kind of digital medium-frequency discriminator |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150121 Termination date: 20200208 |
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| CF01 | Termination of patent right due to non-payment of annual fee |