CN203773040U - Virtual instrument calibration electric transformer-based device - Google Patents
Virtual instrument calibration electric transformer-based device Download PDFInfo
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- CN203773040U CN203773040U CN201420172885.9U CN201420172885U CN203773040U CN 203773040 U CN203773040 U CN 203773040U CN 201420172885 U CN201420172885 U CN 201420172885U CN 203773040 U CN203773040 U CN 203773040U
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Abstract
The utility model discloses a virtual instrument calibration electric transformer-based device. The device includes a virtual instrument platform (1) composed of a computer; the virtual instrument platform (1) is in wired or wireless connection with a signal acquisition host machine (2); a standard signal acquisition card (3) and a signal-to-be-measured acquisition card (4) are plugged in the signal acquisition host machine (2); the input end of the standard signal acquisition card (3) is connected with precision transformer output signals; and the input end of the signal-to-be-measured acquisition card (4) is connected with transformer-to-be-measured output signals. According to the virtual instrument calibration electric transformer-based device of the utility model, a virtual instrument developed in the computer and universal analog signal acquisition equipment are combined with each other so as to accomplish the calibration of an electric transformer, and equivalent effects equivalent to effects brought by a traditional instrument can be realized; and further, with virtual instrument technologies adopted, a large quantity of soft and hardware resources of the computer can be can utilized, and therefore, functions such as high-accuracy data calculation, display and storage can be realized. With the virtual instrument adopted, the logic of a hardware circuit becomes simple, and modules are just needed to be connected with each other.
Description
Technical field
the utility model relates to a kind of device based on virtual instrument verification electric power mutual-inductor, belongs to the technical field of utilizing virtual instrument verification electric-power metering components and parts.
Background technology
electric power mutual-inductor is the equipment of scaling transformation voltage or electric current.Its function is mainly to become standard low-voltage or the little electric current of standard to realize standardization, the miniaturization of measurement instrument, protection equipment and automatic control equipment high voltage or large electric current scaling transformation.Mutual inductor also can be used to separate high-voltage system simultaneously, to guarantee the safety of the person and equipment.
the accuracy of the conversion ratio of electric power mutual-inductor and phase differential accuracy affects electric-power metering, the accuracy of electric power mutual-inductor and stability are the important guarantees of measurement of power, protection, monitoring.Therefore use after certain time limit, all need to do periodic check, the routine work of Zhe Shi electric energy metrical unit.
existing electric power mutual-inductor calibration equipment mostly is entity apparatus, has complex structure, and volume is heavy, and cost is high, the poor deficiency that waits of adaptability.
Summary of the invention
the purpose of this utility model is, a kind of device based on virtual instrument verification electric power mutual-inductor is provided.To solve existing electric power mutual-inductor calibration equipment complex structure, volume is heavy, and cost is high, the problem that adaptability is poor.
the technical solution of the utility model:
a kind of device based on virtual instrument verification electric power mutual-inductor, comprise the virtual instrument platform being formed by computing machine, host machine wired or the wireless connections of virtual instrument platform and signals collecting, on signals collecting main frame, be plugged with standard signal capture card and measured signal capture card, the input end of standard signal capture card is connected with precision transformer output signal, and the input end of measured signal capture card is connected with to-be-tested transformer output signal.
in aforementioned means, described standard signal capture card and measured signal capture card are the NI9205 capture card of American National instrument company.
in aforementioned means, in described standard signal capture card and measured signal capture card, be provided with frequency multiplier and analog-to-digital conversion module.
in aforementioned means, the frequency amplification coefficient of described frequency multiplier is 100.
in aforementioned means, described virtual instrument platform is the computing machine of common X86-based operation Windows operating system, the LabVIEW of American National instrument company is installed as Software Development Platform for Virtual Instruments in computing machine.
in aforementioned means, the NI CompactDAQ-9184 signals collecting machine that described signals collecting main frame is American National instrument company.
compared with prior art, the mode that the virtual instrument that the utility model utilization is developed in computing machine combines with general collection of simulant signal equipment completes the verification of electric power mutual-inductor, can reach the effect suitable with traditional instrument.In addition, virtual instrument technique utilizes the huge soft and hardware resource of computing machine, can realize the functions such as data calculating, demonstration and storage that precision is very high.Virtual instrument becomes simply hardware circuit logic, between module, by simple, connects.Be easy to upgrading and replace, can improve very easily system performance.
Accompanying drawing explanation
fig. 1 is structural representation of the present utility model.
being labeled as in figure: 1-virtual instrument platform, 2-signals collecting main frame, 3-standard signal capture card, 4-measured signal capture card.
Embodiment
below in conjunction with drawings and Examples, the utility model is described in further detail, but not as to any restriction of the present utility model.
a kind of device based on virtual instrument verification electric power mutual-inductor, as shown in Figure 1, comprise the virtual instrument platform 1 being formed by computing machine, virtual instrument platform is the computing machine of common X86-based operation Windows operating system, the LabVIEW of American National instrument NI company is installed as Software Development Platform for Virtual Instruments in computing machine.Virtual instrument platform 1 is connected with signals collecting main frame 2 is wired or wireless, and signals collecting main frame 2 is the NI CompactDAQ-9184 signals collecting machine of American National instrument NI company.On signals collecting main frame, be plugged with standard signal capture card 3 and measured signal capture card 4, standard signal capture card 3 and measured signal capture card 4 are the NI9205 capture card of American National instrument NI company.In standard signal capture card 3 and measured signal capture card 4, be provided with frequency multiplier and analog-to-digital conversion module A/D.The frequency amplification coefficient of frequency multiplier is 100.The input end of standard signal capture card 3 is connected with precision transformer output signal, and the input end of measured signal capture card 4 is connected with to-be-tested transformer output signal.
the course of work of the present utility model and principle
the utility model is that Virtual Instrument Development software is installed in computing machine, in Virtual Instrument Development software, exploitation has transformer error checking routine, calculating and operation display panel with computing machine as this calibration equipment, be connected with to-be-tested transformer output signal with precision transformer output signal respectively by physics harvester; Using precision transformer signal as standard signal, using to-be-tested transformer signal as measured signal; By the virtual instrument being formed by computing machine, standard signal and measured signal are compared, and calculate ratio difference and the angular difference value between measured signal and standard signal, to realize the verification object to to-be-tested transformer.The core parts of described external device (ED) are signals collecting main frames, on signals collecting main frame, be inserted with two capture cards, one is the standard signal capture card being connected with precision transformer input signal, and another piece is the measured signal capture card being connected with to-be-tested transformer input signal; Two capture cards convert the power frequency electric power simulating signal of two mutual inductor outputs after digital signal to, are issued calculating and the operation display panel of virtual instrument by the packing of signals collecting main frame.Described capture card is sampled to mutual inductor input signal with the frequency far above power frequency, obtains high-precision original input, is beneficial to later stage expansion frequency analysis function.The described computing method than difference are respectively the appointment precision transformer of duration and the waveform of to-be-tested transformer two-way input signal to be taken absolute value, and ask for respectively the numerical integration to the time; Then by measured signal integrated value divided by standard signal integrated value, obtain ratio value, through conversion, obtain to-be-tested transformer in the ratio difference under preload.The computing method of described angular difference value are: the precision transformer of duration and the waveform of to-be-tested transformer two-way input signal are specified in intercepting, to-be-tested transformer waveform signal is carried out to the spline interpolation of designated phase step-length, after being taken absolute value, waveform array after interpolation makes the numerical integration to the time, the integrated value of this integrated value and standard signal compares, using and be near the mark the direction of integrated value of signal as the interpolation direction of moving one's steps, until the difference of two integrated values is minimum, think that two waveforms overlap, move one's steps long cumulative be to-be-tested transformer with precision transformer at the phase differential of working as under preload, it is angular difference value.
Embodiment
during concrete enforcement, can implement according to the following steps:
a. select virtual instrument development platform: adopt the LabVIEW of American National instrument (NI) company as Software Development Platform for Virtual Instruments, on LabVIEW platform, write transformer error verification software;
b. select acquisition system main frame: adopt the NI CompactDAQ-9184 of American National instrument (NI) company as acquisition system main frame, it will issue computing machine after the signal integration of data acquisition card collection;
c. select data acquisition card: adopt the NI9205 of American National instrument (NI) company to input capture card as simulating signal;
d. select virtual instrument software operation computing machine: adopt the computing machine of common X86-based operation Windows operating system as the software running platform of check system;
e. sampling and A/D conversion: with the frequency of 100 times of power frequencies, 5000Hz, samples to mutual inductor input signal, can obtain high-precision original input; Under the control of A/D modular converter controller, respectively accurate source transducer signal and to-be-tested transformer signal are carried out to mould/number conversion;
f. calculate ratio: the numerical integration to the time after calculating specifies the two-way waveform signal of duration to take absolute value respectively; Then by measured signal integrated value divided by accurate source signal integrated value, obtain ratio value, through conversion, obtain to-be-tested transformer in the ratio difference under preload;
g. calculate angular difference: the two-way input waveform signal of duration is specified in intercepting, to-be-tested transformer waveform signal is carried out to the spline interpolation of designated phase step-length, after being taken absolute value, waveform array after interpolation does the numerical integration to the time, this integrated value compares with the integrated value of accurate source signal, using the direction of the integrated value that approaches accurate source signal as the interpolation direction of moving one's steps, until the difference of two integrated values is minimum, think that two waveforms overlap, move one's steps long cumulative be to-be-tested transformer with accurate source mutual inductor at the phase differential under preload, i.e. angular difference;
h. output: will by display control, show than difference and angular difference value, and printing reports.
the utility model is selected the virtual instrument hardware and software platform of NI company, has higher reliability.Adopt virtual instrument technique, hardware logic structure is simple, and software programming is directly perceived, and computing method upgrading easily.Spline method is introduced to waveform fitting part, make calculated angular difference there is higher precision.The utility model in actual applications with accurate source mutual inductor as a reference, identical electric power signal is inputted respectively to accurate source mutual inductor and to-be-tested transformer, can calculate to-be-tested transformer with respect to the error in accurate source, when carrying out algorithm simulating, the error of phase differential verification is less than 0.1 minute, higher than 0.1 class precision, can see intuitively the whole process of comparison waveform simultaneously.
Claims (6)
1. the device based on virtual instrument verification electric power mutual-inductor, it is characterized in that: comprise the virtual instrument platform (1) being formed by computing machine, virtual instrument platform (1) and wired or wireless connection of signals collecting main frame (2), on signals collecting main frame (2), be plugged with standard signal capture card (3) and measured signal capture card (4), the input end of standard signal capture card (3) is connected with precision transformer output signal, and the input end of measured signal capture card (4) is connected with to-be-tested transformer output signal.
2. install according to claim 1, it is characterized in that: described standard signal capture card (3) and measured signal capture card (4) are the NI9205 capture card of American National instrument (NI) company.
3. install according to claim 2, it is characterized in that: in described standard signal capture card (3) and measured signal capture card (4), be provided with frequency multiplier and analog-to-digital conversion module (A/D).
4. install according to claim 3, it is characterized in that: the frequency amplification coefficient of described frequency multiplier is 100.
5. install according to claim 1, it is characterized in that: described virtual instrument platform (1), for the computing machine of common X86-based operation Windows operating system, is provided with the LabVIEW of American National instrument (NI) company as Software Development Platform for Virtual Instruments in computing machine.
6. install according to claim 1, it is characterized in that: described signals collecting main frame (2) is the NI CompactDAQ-9184 signals collecting machine of American National instrument (NI) company.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420172885.9U CN203773040U (en) | 2014-04-11 | 2014-04-11 | Virtual instrument calibration electric transformer-based device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420172885.9U CN203773040U (en) | 2014-04-11 | 2014-04-11 | Virtual instrument calibration electric transformer-based device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203773040U true CN203773040U (en) | 2014-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420172885.9U Expired - Fee Related CN203773040U (en) | 2014-04-11 | 2014-04-11 | Virtual instrument calibration electric transformer-based device |
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| Country | Link |
|---|---|
| CN (1) | CN203773040U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103926550A (en) * | 2014-04-11 | 2014-07-16 | 贵州大学 | Device and method for checking electric transformer based on virtual instrument |
-
2014
- 2014-04-11 CN CN201420172885.9U patent/CN203773040U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103926550A (en) * | 2014-04-11 | 2014-07-16 | 贵州大学 | Device and method for checking electric transformer based on virtual instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140813 Termination date: 20200411 |