CN205786882U - A kind of test system of the self-adapting frequency conversion of ferromagnetic element excitation property - Google Patents
A kind of test system of the self-adapting frequency conversion of ferromagnetic element excitation property Download PDFInfo
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Abstract
The test system of the self-adapting frequency conversion of a kind of ferromagnetic element excitation property, this system includes power circuit and drives module, sampling module, power rectifier supply module, DSP or FPGA control module, communication conversion module, PC and upper computer software；Wherein power circuit and driving module thereof are connected with ferromagnetic element to be measured to export amplitude and specific, the positive and negative square wave of frequency, sine wave, constant-current source, for all kinds of iron core kind equipments are carried out the dependence tests etc. such as excitation property, C-V characteristic, D.C. resistance；This utility model has abandoned traditional mode actively controlling output voltage frequency, and by sample rate current, output voltage positive-negative polarity is controlled realizing self-adapting frequency conversion, have simple in construction, convenient test, exciting current symmetry is good, certainty of measurement is high, the congruent advantage of sampled data, is suitable for all kinds of iron core kind equipments and carries out excitation property, C-V characteristic test.
Description
Technical field
The utility model discloses test system and the method for testing thereof of the self-adapting frequency conversion of a kind of ferromagnetic element excitation property, relate to electric power transformer, reactor, transformator, other kinds iron core kind equipment carry out excitation property (or C-V characteristic) test.
Background technology
The iron core kind equipments such as transformer are rings indispensable in power industry, and the metering of power system, monitoring, relay protection, record ripple, range finding are all had an impact by its performance.Excitation property, volt-ampere characteristic test are the important means detecting iron core kind equipment.Traditional approach typically uses power frequency supply to execute alive method at tested iron core kind equipment and tests, according to transformator theory relevant knowledge, if use power frequency or high frequency electric source test, then equipment under test both end voltage will rise to higher level this be detrimental to tester and equipment safety.Occur in that the test mode of low-frequency and low-voltage the most in recent years so that test environment is safer, test instrunment is lighter.But the method for all kinds of iron core kind equipments such as existing low-frequency and low-voltage test current transformer, most mode using actively control output square wave frequency is tested, and there is the problems such as test process exciting current is asymmetric, measuring accuracy inadequate, non-high-speed sample devices sampled data loss.
Summary of the invention
The purpose of this utility model is to improve in the past that exciting current is asymmetric present in the iron core kind equipment low-frequency and low-voltage method of testing, measuring accuracy not, the problem such as non-high-speed sample devices sampled data loss, abandon the mode actively controlling output voltage frequency in conventional method of testing, and by sample rate current, voltage positive-negative polarity is controlled, its simple in construction, convenient test, exciting current symmetry is good, certainty of measurement is high, sampled data is complete, is suitable for all kinds of iron core kind equipments and carries out excitation property, C-V characteristic test.
This utility model is that logical technical scheme is: the test system of the self-adapting frequency conversion of a kind of ferromagnetic element excitation property, including: power circuit and driving module, sampling module, power rectifier supply module, DSP or FPGA control module, communication conversion module, PC and upper computer software；Wherein power circuit and driving module thereof are connected with ferromagnetic element to be measured to export amplitude and specific, the positive and negative square wave of frequency, sine wave, constant-current source, for all kinds of iron core kind equipments are carried out the dependence tests such as excitation property, C-V characteristic, D.C. resistance；The relevant informations such as the responsible electric current to tested iron core kind equipment of sampling module, voltage are acquired and are uploaded to control module and receive the control instruction of control module simultaneously；Power rectifier supply module is connected with control module and power circuit and is responsible for power circuit is carried out low-voltage power supply and signal condition.And control module uses frequency adaptive mode to be controlled the positive-negative polarity of power circuit output voltage (square wave), the various information needing storage and process is uploaded to PC by communication conversion module and finally delivers to upper computer software such as labview and operate by control module simultaneously.
The test system of the self-adapting frequency conversion of a kind of ferromagnetic element excitation property, include: power circuit and drive the key modules including module, sampling module, DSP or FPGA control module, PC and host computer；Described DSP or FPGA control module is connected with power circuit and driving module thereof, needs to send control signal according to test and controls the amplitude and specific needed for power circuit output, the positive and negative square wave of frequency, sine wave, constant-current source；Described DSP or FPGA control module is also connected with sampling module, is acquired electric current, the voltage of tested iron core kind equipment for controlling sampling module.
In this utility model, control module is that the positive-negative polarity of output voltage can be controlled by DSP or FPGA control module.
The device architecture of the test system of the self-adapting frequency conversion of a kind of ferromagnetic element excitation property with annexation is: the system bottom is power circuit and drives module, can be by switching output amplitude and specific, the positive and negative square wave of frequency, sine wave, constant-current source.Being connected to power rectifier supply module between power circuit and control module, this module is mainly in order to provide low-voltage power supply and signal condition.The parallel above of power rectifier supply module is placed DSP or FPGA control module, and power circuit provides control instruction, and voltage x current sample circuit, is acquired the relevant informations such as the electric current of tested iron core kind equipment, voltage.
The method of testing of the self-adapting frequency conversion of a kind of ferromagnetic element excitation property, is alternately loaded onto positive voltage and negative voltage iron core kind equipment input to be measured, gathers the voltage of equipment under test, electric current；Compared by current threshold, control the positive negative output of voltage, change the frequency of output square-wave voltage adaptively so that the exciting current of tested iron core kind equipment is gradually increased or reduces；Method and Related Mathematical Models by this passive controlling party wave voltage frequency draw: fundamental magnetization curve, iron core magnetization loop bunch, VA characteristic curve；
Step is:
1) the measurement threshold current ± Iset of iron core kind equipment to be measured is configured；
2) alternately positive voltage and negative voltage are loaded onto iron core kind equipment input side to be measured, gather tested iron core kind equipment electric current I, voltage U；
3) for high-speed sampling equipment: being compared with the current threshold current ± Iset set by the electric current I gathered, if-Iset is ＜ I ＜ Iset, then output voltage remains positive polarity；Until sample rate current I is incrementally up to positive threshold electric current Iset, then automatically output voltage is switched to negative polarity and keeps；When sample rate current I successively decrease reach reverse threshold current-Iset time, automatically output voltage is switched to positive polarity again and keeps, by the number of times reaching positive and negative threshold current is counted, measure a circle hysteresis curve corresponding to threshold current, automatically being modified threshold current and measure the circle hysteresis curve that another threshold current is corresponding, reciprocation cycle is until having tested；
4) for non-high-speed sample devices, align negative threshold value electric current ± Iset and carry out buffered, it is made to remain Iset or-Iset a period of time, to meet sample requirement, described in when now the regulative mode of output voltage polarity is tested with high-speed sampling equipment the most consistent, when sample rate current I meets-Iset ＜ I ＜ Iset, and output voltage remains positive polarity；After sample rate current I is incrementally up to positive threshold electric current Iset, output voltage remains zero, and now equipment under test exciting current stabilizes to Iset until sample devices has been sampled and again output voltage switched to negative polarity；After sample rate current I successively decreases and reaches reverse threshold current-Iset, export same voltage and remain zero, now equipment under test exciting current stabilizes to-Iset until sample devices has been sampled and output voltage is switched to positive polarity again, by the number of times reaching positive and negative threshold current is counted, measure a circle hysteresis curve corresponding to threshold current, automatically being modified threshold current and measure the circle hysteresis curve that another threshold current is corresponding, reciprocation cycle is until having tested；
5) finally recycleMathematical model, tries to achieve the relation between tested iron core kind equipment magnetic flux and exciting current, generates magnetization curve and stores, whereinFor tested iron core kind equipment outlet side two ends institute making alive,For the excitation voltage of tested iron core kind equipment, φ (t) is tested iron core kind equipment magnetic flux.
This utility model has the advantages that
1, can complete test in the environment of low pressure low frequency, effectively reduction process of the test, to personnel and the security risk of equipment under test, makes test equipment realize lightweight simultaneously；
2, using electric current to control, frequency Self Adaptive Control mode controls output voltage polarity, solves exciting current asymmetry so that measuring accuracy is higher；
3, exciting current is carried out buffered so that non-high-speed sample devices realizes the collection of total data equally, it is to avoid sampled data is lost；
4, output voltage frequency is directly controlled in being different from conventional low-frequency and low-voltage method of testing by this utility model, and use and iron core kind equipment exciting current is carried out actively control, by exciting current threshold ratio relatively, control output voltage polarity, reach the purpose of square-wave voltage frequency self-adaptative adjustment, to solve the asymmetric problem of test process exciting current, improve the measuring accuracy of iron core kind equipment；Be difficult to obtain the deficiency of exciting current peak value simultaneously for non-high-speed sample devices, the waveform of output square-wave voltage is also improved by this invention, equally applicable during to meet relatively low sample rate.
Accompanying drawing explanation
Fig. 1 is this utility model system architecture diagram；
Fig. 2 is that this utility model excitation property tests equivalent circuit；
Fig. 3 is the output of this utility model constant amplitude frequency conversion square wave；
Fig. 4 is the magnetization curve bunch figure that this utility model constant amplitude frequency conversion square wave is corresponding；
Fig. 5 is that this utility model electric current overturns counterparty's wave voltage figure；
Fig. 6 is that this utility model improves electric current upset counterparty's wave voltage figure.
Detailed description of the invention
In order to more clearly illustrate the technical solution of the utility model and advantage, being further elaborated this utility model below in conjunction with the accompanying drawings, Fig. 1 show system architecture diagram of the present utility model.
Tested iron core kind equipment excitation property test equivalent circuit is set up according to Fig. 2.Wherein LmRepresent main inductance, ReRepresent eddy-current loss resistance, RhRepresent hysteresis loss resistance, RctRepresenting Secondary Winding D.C. resistance, u (t) is the terminal voltage putting in Secondary Winding during test, and e (t) is Secondary Winding induced potential.ieT () is the equivalent current of eddy-current loss, ihT () is the equivalent current of magnetic hystersis loss, imT () is to flow through RhAnd LmThe electric current of the parallel branch of composition, iexT () is exciting current.
Threshold current I to iron core kind equipment to be measured testsetIt is configured.
Tested iron core kind equipment is powered by the positive and negative square wave using constant amplitude frequency conversion as shown in Figure 3, and the desired datas such as exciting current I, voltage U are sampled and stored.
For high-speed sampling equipment, as it is shown in figure 5, electric current I and the current threshold current ± I set that the exciting current I of sampling gained will be gathered by control modulesetCompare, if Iset＜ I ＜ Iset, then output voltage remains positive polarity；Until sample rate current I is incrementally up to positive threshold electric current Iset, then automatically output voltage is switched to negative polarity and keeps；Reverse threshold current I is reached when sample rate current I successively decreasessetTime, automatically output voltage switched to positive polarity again and keeps, by the number of times reaching positive and negative threshold current is counted, measuring a circle hysteresis curve corresponding to threshold current.Automatically threshold current is modified again, with the adaptive frequency changing output square wave, make to export square wave and be rendered as shown in Fig. 3 group constant amplitude frequency conversion square wave, thus measure the circle hysteresis curve that another threshold current is corresponding, finally give and measured corresponding magnetization curve bunch by the square wave of constant amplitude frequency conversion, as shown in Figure 4.
For non-high-speed sample devices, as shown in Figure 6, negative threshold value electric current ± I is alignedsetCarry out buffered so that it is remain IsetOr IsetA period of time, to meet sample requirement.Now the regulative mode of output voltage polarity is the most consistent, when sample rate current I meets I with described in the test of high-speed sampling equipmentset＜ I ＜ Iset, output voltage remains positive polarity；When sample rate current I is incrementally up to positive threshold electric current IsetAfter, output voltage remains zero, and now equipment under test exciting current stabilizes to IsetUntil sample devices has been sampled and again output voltage has been switched to negative polarity；Reverse threshold current I is reached when sample rate current I successively decreasessetAfter, export same voltage and remain zero, now equipment under test exciting current stabilizes to IsetUntil sample devices has been sampled and again output voltage has been switched to positive polarity, by the number of times reaching positive and negative threshold current is counted, measure a circle hysteresis curve corresponding to threshold current, automatically being modified threshold current and measure the circle hysteresis curve that another threshold current is corresponding, reciprocation cycle is until having tested.
In test process, every desired data is uploaded to PC process by communication conversion module by control module, finally data is delivered to upper computer software, in the upper computer softwares such as labview, according to test data.Utilize Mathematical model, tries to achieve the relation between tested iron core kind equipment magnetic flux and exciting current, generates magnetization curve and stores.
Claims (2)
1. a test system for the self-adapting frequency conversion of ferromagnetic element excitation property, is characterised by including: power circuit and driving module, sampling module, DSP or FPGA control module, PC and host computer；
Described DSP or FPGA control module is connected with power circuit and driving module thereof, needs to send control signal according to test and controls the amplitude and specific needed for power circuit output, the positive and negative square wave of frequency, sine wave, constant-current source；
Described DSP or FPGA control module is also connected with sampling module, is acquired electric current, the voltage of tested iron core kind equipment for controlling sampling module.
The test system of the self-adapting frequency conversion of a kind of ferromagnetic element excitation property the most according to claim 1, it is characterised in that control module is that the positive-negative polarity of output voltage can be controlled by DSP or FPGA control module.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105866586A (en) * | 2016-04-25 | 2016-08-17 | 云南电力试验研究院(集团)有限公司 | Adaptive frequency type ferromagnetic element excitation characteristic testing system and method |
| CN107607790A (en) * | 2017-09-21 | 2018-01-19 | 云南电网有限责任公司电力科学研究院 | The translation method of the lower converters core loss of difference excitation |
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2016
- 2016-04-25 CN CN201620352775.XU patent/CN205786882U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105866586A (en) * | 2016-04-25 | 2016-08-17 | 云南电力试验研究院(集团)有限公司 | Adaptive frequency type ferromagnetic element excitation characteristic testing system and method |
| CN105866586B (en) * | 2016-04-25 | 2019-07-16 | 云南电力试验研究院(集团)有限公司 | A kind of test macro and its test method of the self-adapting frequency conversion of ferromagnetic element excitation property |
| CN107607790A (en) * | 2017-09-21 | 2018-01-19 | 云南电网有限责任公司电力科学研究院 | The translation method of the lower converters core loss of difference excitation |
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