CN2529263Y - Digital harmonic voltage factor test instrument - Google Patents
Digital harmonic voltage factor test instrument Download PDFInfo
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- CN2529263Y CN2529263Y CN 01254118 CN01254118U CN2529263Y CN 2529263 Y CN2529263 Y CN 2529263Y CN 01254118 CN01254118 CN 01254118 CN 01254118 U CN01254118 U CN 01254118U CN 2529263 Y CN2529263 Y CN 2529263Y
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- circuit
- voltage
- harmonic
- conversion
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Abstract
The utility model relates to a digital harmonic voltage factor test instrument, which belongs to the technical field of electric motor testing. Because of the change of the national and international standard on rotating electric machines and the requirement on measuring power frequency voltage harmonic voltage factor and distortion rate, the test instrument develops. The instrument is mainly composed of a voltage dividing and sampling circuit, a synchronously tracking circuit, an A/D converting circuit, a controlling and calculating circuit, a displaying circuit, an RS232 communication interface circuit, a power supply and other circuits. The utility model has the technical proposal that the tested voltage is divided and taken samples, after A/D conversion, a discrete numerical sequence with a wave-shaped period is obtained. The harmonic each time of the sequence can be calculated by the fast fourier transform, and a harmonic voltage factor value can be calculated according to the definition of the harmonic voltage factor and then is displayed. The instrument is digital, and has the advantages of simple structure, simple and convenient operation and high measuring speed.
Description
Technical field
The utility model relates to a kind of digital harmonic voltage factor tester, belongs to the Motor Measuring Technology field.
Background technology
Along with the continuous development and the standard of motor technology, the test of motor also there is new requirement.IEC60034-1 (the 10th edition) during to motor test the sine tolerance of mains voltage waveform change the harmonic voltage factor into by irregularity of wave form.China GB GB755 has also made corresponding modify.
Because the harmonic voltage factor is different with the irregularity of wave form definition, one of its key distinction is the weight that the harmonic voltage factor has reduced higher hamonic wave, both computing formula differences, be difficult to find out a function of determining and represent both transformational relations, therefore can't extrapolate corresponding harmonic voltage factor from irregularity of wave form, so the change of measure just means the change of surveying instrument, must develop new instrument and satisfy new standard-required.
By retrieval, only find the Russia's patent nineties " digitalizer of measuring voltage harmonic wave factor " (on the October 7 nineteen ninety applying date, authorize October 3 nineteen ninety-five), but can not embody the measurement of IEC60034-1 the harmonic voltage factor.Can only record each harmonic by spectrum analyzer at present, calculate the harmonic voltage factor value through harmonic voltage factor formula again, also not have the direct measurement that realizes the harmonic voltage factor of an instrument.
Summary of the invention
The purpose of this utility model provides a kind of tester of digital, simple in structure, easy to operate, direct measurement power-frequency voltage harmonic voltage factor that measuring speed is fast.
In order to achieve the above object, inventive concept of the present utility model is: analyze to the direct measurement of power-frequency voltage harmonic voltage factor and to the harmonic component of voltage, and show measurement with LED.Adopt tracking synchronously, A/D conversion and Fourier transform for this reason, make the tester measurement fast, accurately.Its technical scheme is: tested voltage dividing potential drop is taken a sample, changed through A/D, obtain the discrete digital sequence of a wave period, and calculating each harmonic by Fourier transform, the definition according to the harmonic voltage factor calculates the harmonic voltage factor value again, and shows this numerical value.In order to improve measuring accuracy, adopt similar synchronous tracking technology, synchronous to guarantee sampling period and wave period.
Because the utility model has been realized analyzing to the direct measurement of power-frequency voltage harmonic voltage factor and to the harmonic component of voltage, and show measurement result with LED.Owing to adopt technology such as tracking synchronously, A/D conversion and Fourier transform, characteristics such as measuring accuracy height, speed are fast, tester is succeeded in developing, adapt to the concerned countries standard of revising merger in recent years and IEC standard to measuring the requirement of harmonic voltage factor, solved the testing apparatus problem of domestic electric machine industry and relevant unit.
Description of drawings
Fig. 1 is the electric wiring block diagram of the utility model tester.
Fig. 2 is the electric wiring schematic diagram of the utility model tester.
Among Fig. 1,1 is that pressure sampling circuit, 2 is that synchronous follow-up circuit, 3 is that A/D change-over circuit, 4 is that display circuit, 6 is the communication interface circuit for controlling counting circuit, 5.
Among Fig. 2, the functional circuit 1～6 that the with dashed lines frame comes out is identical with the numbering among Fig. 1.
Embodiment
With reference to Fig. 1, this utility model tester comprises following circuit: dividing potential drop sampling 1, follow the tracks of 2 synchronously, A/D conversion 3, control calculate 4, show 5, communication interface 6.Connecing the relation of joining between the foregoing circuit is: the input end and the tested voltage of dividing potential drop sampling 1 join, its output terminal joins with the input end of synchronous tracking 2 and A/D conversion 3 respectively, the dividing potential drop sampling is with tested voltage sampling, change through A/D, A/D changes 3 and is subjected to tracking 2 synchronously and the control of controlling calculating 4, its output termination control calculates 4, show 5 input termination control calculating 4, the input termination control of communication interface 6 calculates 4, obtain the discrete digital sequence of a wave period through the A/D conversion, and pass through Fourier transform, calculate each harmonic, calculate voltage factor value and demonstration again.Power circuit connects each functional circuit.
With reference to Fig. 2, the electric wiring of the utility model tester is following each functional block, and pressure sampling circuit 1 comprises resistance R
1, R
2, R
5～R
12, potentiometer W
1, photoelectric switch G
1, amplifier Y
1A, Y
1B; Synchronous follow-up circuit 2 comprises phase locking unit 4046, counter 4520, resistance R
16～R
18, capacitor C
14, C
15, Sheffer stroke gate 7400; A/D change-over circuit 3 comprises AD1674, resistance R
13, R
14, potentiometer W
2, W
3, capacitor C
7～C
9 Control counting circuit 4 comprises 8155,8031,74LS373,2764,6116, resistance R 15, capacitor C
16, C
12, crystal oscillator; Display circuit 5 comprises LED, 74LS138, MC14513; Communication interface circuit 6 comprises MAX232, capacitor C
17～C
20The relation of joining that connects of the above each several part circuit is: the input end of pressure sampling circuit 1 and tested voltage join, AD1674 the 20th pin of its output termination A/D conversion 3, receive the 14th pin of phase locking unit 4045 of synchronous tracking 2 and the 3rd pin of AD1674 by reverser and photoelectric switch again, after the brilliant logical calculated of the output of synchronous tracking 2 and 8031 P1.5, receive the 5th of AD1674 respectively, 6 pin, 4 8155 PA is calculated in the output termination control of A/D conversion 3, show that 5 input termination control calculates 4 8155 PB, the input termination control of RS232 communication interface 6 calculate 4 8031 the 10th, 11 pin.The signal transitive relation is: tested alternating voltage becomes low-voltage through the dividing potential drop sampling, send into the A/D conversion after the normalization, normalized low voltage signal is sent into the synchronous tracking that frequency is finished in synchronous tracking through reverser and photoelectric switch simultaneously, to export control signal and send into the A/D conversion, make the sampling period of A/D conversion synchronous with wave period all the time, the A/D conversion is under the control that control is calculated and followed the tracks of synchronously, the low-voltage analog signal conversion digital signal that dividing potential drop sampling is sent into, this signal calculates each harmonic with Fourier transform as calculated, and calculates HVF value and demonstration or deliver on the PC through interface by HVF definition.
More than for describing in detail, the technical scheme of its schematic circuit is preferred embodiment of the present utility model.
Claims (2)
1. digital harmonic voltage factor tester, it is characterized in that: this instrument comprises following circuit, be pressure sampling circuit (1), synchronous follow-up circuit (2), A/D change-over circuit (3), control counting circuit (4), display circuit (5), communication interface circuit (6) and power circuit (7), connect between the foregoing circuit to join and concern and be:
The input end and the tested voltage of pressure sampling circuit (1) join, its output terminal joins with the input end of synchronous follow-up circuit (2) and A/D change-over circuit (3) respectively, pressure sampling circuit is with tested voltage sampling, and through the A/D conversion, the A/D change-over circuit is subjected to synchronous follow-up circuit (2) and control counting circuit
(4) control, its output termination control counting circuit (4), the input termination control counting circuit (4) of display circuit (5), the input termination control counting circuit (4) of communication interface circuit (6), obtain the discrete digital sequence of a wave period through the A/D conversion, and calculate each harmonic by fast fourier transform, calculate the voltage factor value again and show that power circuit (7) connects each functional circuit.
2. tester according to claim 1 is characterized in that: described pressure sampling circuit (1) comprises resistance R
1, R
2, R
5～R
12, potentiometer W
1, photoelectric switch G
1, amplifier Y
1A, Y
1The B components and parts;
Described synchronous follow-up circuit (2) comprises phase locking unit 4046, counter 4520, resistance R
16～R
18, capacitor C
14, C
15, Sheffer stroke gate 7400;
Described A/D change-over circuit (3) comprises AD1674, resistance R
13, R
14, potentiometer W
2, W
3, capacitor C
7～C
9
Described control counting circuit (4) comprises 8155,8031,74LS373,2764,6116, resistance R
15, capacitor C
12, C
16, crystal oscillator;
Described display circuit (5) comprises LED, 74LS138, MC14513;
Described interface circuit (6) comprises MAX232, C
17～C
20
The inside annexation of foregoing circuit is: the input end and the tested voltage of pressure sampling circuit (1) join, AD1674 the 20th pin of its output termination A/D conversion (3), receive the 14th pin of phase locking unit 4045 of synchronous tracking (2) and the 3rd pin of AD1674 by reverser and photoelectric switch again, the output terminal of synchronous tracking (2) and 8031 P1.5 are after logical calculated, receive the 5th of AD1674 respectively, 6 pin, 8155 the PA of (4) is calculated in the output termination control of A/D conversion (3), 8155 the PB of (4) is calculated in the input termination control that shows (5), the input termination control of RS232 communication interface (6) calculate (4) 8031 the 10th, 11 pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01254118 CN2529263Y (en) | 2001-10-11 | 2001-10-11 | Digital harmonic voltage factor test instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01254118 CN2529263Y (en) | 2001-10-11 | 2001-10-11 | Digital harmonic voltage factor test instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2529263Y true CN2529263Y (en) | 2003-01-01 |
Family
ID=33663500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01254118 Expired - Fee Related CN2529263Y (en) | 2001-10-11 | 2001-10-11 | Digital harmonic voltage factor test instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2529263Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1310393C (en) * | 2004-04-29 | 2007-04-11 | 江苏省电力公司泰州供电公司 | Harmonic superscale protecting method in low-voltage reactive compensation |
| CN1330969C (en) * | 2004-08-25 | 2007-08-08 | 江苏省电力公司南京供电公司 | Power frequency parameter tester and testing method for high tension transmission line |
-
2001
- 2001-10-11 CN CN 01254118 patent/CN2529263Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1310393C (en) * | 2004-04-29 | 2007-04-11 | 江苏省电力公司泰州供电公司 | Harmonic superscale protecting method in low-voltage reactive compensation |
| CN1330969C (en) * | 2004-08-25 | 2007-08-08 | 江苏省电力公司南京供电公司 | Power frequency parameter tester and testing method for high tension transmission line |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |