CN104267223A - Low-voltage multi-frequency and amplitude mixed test source generating device - Google Patents
Low-voltage multi-frequency and amplitude mixed test source generating device Download PDFInfo
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- CN104267223A CN104267223A CN201410562387.XA CN201410562387A CN104267223A CN 104267223 A CN104267223 A CN 104267223A CN 201410562387 A CN201410562387 A CN 201410562387A CN 104267223 A CN104267223 A CN 104267223A
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Abstract
A low-voltage multi-frequency and amplitude mixed test source generating device is characterized by comprising a power frequency power source, a four-winding transformer, a sampling device, a random noise generator and a pulse generator. The low-voltage multi-frequency and amplitude mixed test source generating device has the advantages of being economical, feasible, high in flexibility, free of a complex signal generating device and capable of being widely applied to tests of transformers, mutual inductors and capacitors.
Description
Technical field
The present invention's design relates to electric equipment test field, especially designs a kind of low pressure multi-frequency and amplitude bulk testing source generating means.
Background technology
Electric equipment test majority adopts High-Voltage Insulation strength test, and type testing comprises power frequency withstand test and lightning impulse withstand voltage test, both possesses destructiveness.Signal amplitude superposition test has report at home, but does not specialize the stacking apparatus of practical operation, and the kind that the follow-up data mainly tested superposition obtains and analytical approach are innovated.
The present invention proposes test battery device, belongs to a kind of tested device and pilot system is in cascaded structure relation, and the voltage being therefore applied to tested device two ends can by regulating the voltage amplitude at two ends, and frequency or resonant condition reach order ground.
Summary of the invention
Patent of the present invention then proposes one both can realize amplitude superposition, and can realize again the two-fold Accelerated Life device of frequency alias, this test pill device is by four winding half appendiron core transformers, adjustable high-voltage capacitor, adjustable resistor, trigger power signal, power noise signal forms.
Technical scheme of the present invention is as follows:
A kind of low pressure multi-frequency and amplitude bulk testing source generating means, the present invention is characterised in that, this device comprises power frequency supply, 4 winding transformers, sampling apparatus, random noise generator, pulse producer;
Wherein,
The primary side of 4 winding transformers is composed in parallel by winding 1 and winding 3, and secondary side is made up of winding 2 and winding 4; Resistance R1 and telefault L1 connects afterwards and capacitor C1 composes in parallel winding 1; Winding 2 is formed after resistance R2 and telefault L2 is in parallel with adjustable condenser C2 after connecting; Winding 3 is made up of telefault L3, and winding 4 is made up of telefault L4;
One end of power frequency supply, tested device, winding 1 sequentially connects, the other end ground connection of winding 1; Between power frequency supply and tested device, access sampling apparatus, sampling apparatus and winding 3 are connected in parallel; Random noise generator and winding 2 are connected in parallel; Pulse producer and winding 4 are connected in parallel.
Power frequency supply output power of the present invention is 10-5000W, and output voltage is 100V-1000V.
Harvester of the present invention is that three-channel parallel gathers structure, and sample frequency bandwidth is 100MHz.
Pulse producer output pulse width 0.1uS-500uS, voltage magnitude 1-500V of the present invention.
Random noise generator output power 1-20W of the present invention.
4 winding transformers of the present invention, winding shares a high-frequency core structure, and each winding is independent winding lamination parcel, is provided with air gap adjusting bolt, can regulates the coupling coefficient between each winding between each winding.
The material of iron core of the present invention is soft magnetic ferrite, manganese-zinc ferrite, or nickel-zinc ferrite.
Adjustable condenser of the present invention, the output power of random signal generator can be regulated, this electric capacity and Transformer Winding produce the resonance potential of frequency higher than power frequency component simultaneously, as the signal source of aliasing test signal, the power-frequency voltage exported with power frequency supply produces Magnitude Difference, is applied on tested device.
Winding 2 be input winding be also export winding, inspire lower formation LC at outside power current and vibrate, this oscillator signal again reverse coupled to winding 1.Equally, namely winding 1 is that to input also be export winding. and winding 1 and winding 3 are Same Name of Ends Coupling Design.In principle, only have winding 3, be export winding, winding 1 and winding 2,4 are all the functions of bidirectional coupled.
Tested device of the present invention is serially connected between power frequency supply and 4 winding transformer input ports 1, the withstand voltage end of tested device is floating ground state, allows test current carry out producing the current vector I1 being subject to tested high-tension apparatus impedance magnitude and phase effect after an impedance modulation through tested device.Pulse producer produces pulse signal, is coupled to 4 winding transformers inner, at 4 winding transformer input port 1 generation current signal I2 through winding 4.Random noise generator produces random noise signal, is coupling in 4 winding transformer input port 1 generation current signal I3 through winding 2.I1, I2, I3 tri-different amplitude in tunnel, the signal of frequency and phase place is coupled to winding 3 after aliasing, obtains voltage or current waveform information, for carrying out analysis of Impedance Characteristic to tested device by harvester.
The present invention by regulating power frequency supply output voltage, or regulates the adjustable condenser of winding, or regulating impulse frequency generator, or controls the order ground that random noise generator output duration regulates the voltage being applied to tested device two ends.
Outstanding advantages of the present invention is, tested device, as a central apparatus in test loop, both directly bore trial voltage, and produce modulating action by the impedance of self to test terminal voltage again, this structure is convenient to the phase information gathering tested device.
Another advantage of the present invention is, by the adjustable condenser adjustment resonance frequency of transformer secondary output end, thus adjustment is applied to signal frequency and the amplitude of tested high-tension apparatus one end (B end), the power frequency supply of this signal and the other end (A holds) produces amplitude difference, produces amplitude superposed signal.The random noise generator in parallel with adjustable condenser can play the effect regulating resonance signal power density.
Because testing transformer adopts multiple secondary winding, and transformer presents nonlinear state at wide frequency range, and the nonlinear characteristic of positive good utilisation transformer, forms series resonance with test specimen thus, sets up abundant resonance spectrum.Comparatively precipitous impulse test waveform can be obtained by adjustment adjustable condenser and pulse producer, and under this Impulse Voltage, even if tested device partial short-circuit is in low resistive state, or directly puncture short occurs, all impact can not be formed on test unit security.
Exemplary beneficial effect of the present invention is illustrated by system architecture of the present invention, can fast construction pilot system, have economy, feasible, dirigibility is high, without the need to the advantage of the signal generation apparatus of complexity, can be widely used in transformer, mutual inductor, capacitor is tested.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the impedance plot that the impedance spectrum respective resonant frequencies of the test specimen that the present invention is obtained by harvester is set up;
Test specimen terminal voltage waveform when Fig. 3 is respective resonant frequencies 10MHz of the present invention.
Embodiment
Embodiment 1:
If power frequency supply output voltage is 200V, random noise generator output end voltage is specified 5V, harvester passage 1 and power-frequency voltage output terminal are by being directly connected after step-down, harvester passage 2 is in parallel with Transformer Winding 3, pulse producer is connected with Transformer Winding 4, output voltage is 20V, and pulse width is 1uS.Acquisition channel 3, as alternate channel, adopts bnc interface, as expansion end, can be used for gathering other external signals.
Tested device is 10kV transformer, power frequency supply, tested device are sequentially connected with one end of winding 1, the other end ground connection of winding 1, and winding 1 is connected afterwards by resistance R1 and telefault L1 and capacitor C1 composes in parallel, C1 is spurious oscillation harmonic elimination electric capacity, as shown in Figure 1.
Because tested device is connected on pilot system inside, the voltage signal of harvester two paths collection thus directly contains the phase information of tested device.
If industrial frequency experiment output end voltage is V1, tested transformer output end voltage is V2, and the voltage of testing transformer second winding collection is V3, and the no-load voltage ratio of the second winding and the first winding is 1/20, then tested transformer terminal voltage is the phase differential of V1-V2, V1 and V2 and the angle of impedance of test specimen.If V1 and V2 just in time direction is contrary, present maximum amplitude superposition, then maximum amplitude is | v1|+|v2|.
Be applied to the loop current I=V2-20 × V3 under the effect of tested transformer both end voltage.
It can thus be appreciated that tested transformer impedance:
If the L2 inductance value of testing transformer winding 2 is 100mH, adjustable condenser capacitance is 1uF, then target resonance frequency is: 15.9MHz.
Have no-output at random noise generator, and pulse producer is with or without under output condition, the transformer impedance value of acquisition is as following table:
Described in table, different according to the resonance frequency that different adjustable electric capacitances produces, the measurement impedance value obtained is different, thereby establish the test condition of test specimen characteristic impedance and resonance frequency.Because the site environment born during high-tension apparatus existing defects is complicated, be subject to harmonic wave factor, noise effect, switching impulse, and the factor such as the resonance of self and circuit, employing conventional test methods is difficult to impedance characteristic when finding running environment, the invention provides a kind of research technique of composite wave-shape thus.
In addition, because high-tension apparatus is before generation insulation breakdown, segmental defect cannot be found by power-frequency voltage, the capacitance of defect performance is less, sets up a set of high-frequency resonant and complex superposition test condition, defect electric capacity and pilot system are formed a loop and test by the present invention, characteristic resonant frequency point can be found fast, this resonance frequency can be regulated by the outside adjustable condenser applied, final acquisition maximum impedance value or minimum impedance value, thus finds defect fast.
Although also there is part low pressure test (LPT) method the part of test specimen as resonant element to be tested, but be with significant difference of the present invention, the trigger voltage that the present invention tests resonance is applied directly to tested high-tension apparatus two ends, both can by having changed industrial frequency experiment Voltage Cortrol resonant trigger power, also can change resonance frequency by adjustment resonant capacitor thus finally change the order ground being applied to tested device both end voltage, tested high-tension apparatus two ends are in floating ground state, even if be in low-resistance or short-circuit condition, also do not affect experimental safe.
Embodiment 2:
The present embodiment is by external monitoring means, and device of the present invention may be used for the defect diagonsis tested based on the high-tension apparatus aliasing of spectral power density.
As described in Example 1, the two-way information of voltage of harvester directly contains impedance and the angle of impedance of tested device, but due to the impact regulated that is put to the test, the surface imperfection capacitance of tested device only just can produce peak power signal when characteristic resonant frequency mates with the characteristic impedance of whole test loop, emphasis is needed to regulate adjustable condenser value thus, and pulse producer and random noise generator are as supplementary means, high-frequency signal and the noise signal of continuation are provided, defective tested high-tension apparatus can present obvious heating effect at continuation high-frequency signal and noise signal environment, this contributes to improving test specimen temperature rise, find defect in advance.
Be located under regulating resonance adjustable condenser numerical value situation continuously, obtain the resonance signal that bandwidth is 100M, the impedance spectrum (impedance curve that respective resonant frequencies is set up) of the test specimen obtained by harvester as shown in Figure 2.
Wherein, measured value when represented by dotted arrows exports without high frequency pulse generator in fig. 2, the impedance spectrum value that solid line is pulse producer continuation output pulse width when being 5uS.As can be seen here, change pulse producer and export the characteristic substantially not changing impedance spectrum, but the lowest impedance value on impedance spectrum exists notable difference, the Frequency point that lowest impedance occurs also starts to low skew.
If the lowest impedance value respective frequencies of dotted line impedance spectrum test is 12MHz, frequency corresponding to lowest impedance value realizing impedance spectrum test is 10MHz, by the observation to test signal, analysis is applied to the voltage spectrum at tested high-tension apparatus two ends as shown in Figure 3.
As seen from Figure 3, the composite signal produced after power frequency supply test signal and simple transformer secondary output winding 2 resonance is shown in dotted line.After resonance frequency is applied to power-frequency voltage signal, create the waveform of similar rectangular shape, rect.p. intermediate ends has lower decline, and this just in time conforms to the impedance minimum point that impedance spectrum curve occurs.
And after being applied with pulse-couple signal, the voltage that signal is applied to test specimen two ends is kurtosis.But it should be added that, this terminal voltage signal only in resonance frequency close to 10MHz, and the phenomenon produced after being applied with pulse signal, if do not apply pulse signal, the waveform voltage signal obtained at 10MHz and 12MHz is substantially close, all presents rectangular shape.
As can be seen here, the present invention, by regulating resonance adjustable condenser, then follows the tracks of the waveform character gathering test specimen terminal voltage and can provide a kind of test model based on test waveform.And also can carry out spectrum analysis on this basis, because the power spectrum density of spike test waveform is higher, the power spectrum characteristic of tested device can be analyzed accordingly.The method of concrete enforcement power spectrum and time-domain analysis not within the claims in the present invention, here only as a description of embodiment.
It should be added that, random noise generator continuation can export random noise signal equally, can produce irregular frequency signal, is applied to high-tension apparatus aging test for use apparatus of the present invention, needs to apply playing an important role of electric noise.Meanwhile, the test method based on random voltages signal has had to be studied more widely, and just apply less in high-tension apparatus fault and aging test field, the present invention does not make restriction to concrete noise response analytical approach.
In addition; because test specimen is serially connected in pilot system inside by the test structure that provides of native system; the power frequency supply be connected with test specimen or testing transformer all can be used as the two-way load of test specimen; so there is not the load structure Effect of Short Circuit of test specimen suddenly-applied short circuit to experiment power supply; thus make the test unit reliability of native system apparently higher than conventional test methods; simultaneously due to tested be that the less pilot system that also do not affect of equipment generation puncture short or impedance own is normally run, thus without the need to designing complicated protection and switching control device.As above this technical advantage is summed up, this test method not only can be used for capacitive high-tension apparatus, also can be used for perceptual high-tension apparatus, as reactor, the winding etc. of transformer, and abundant resonance and impedance data can be obtained on the basis of this test unit, for the performance analysing in depth electrical equipment provides abundant information, thus there is practical value widely.
Claims (7)
1. low pressure multi-frequency and an amplitude bulk testing source generating means, it is characterized in that, this device comprises power frequency supply, 4 winding transformers, sampling apparatus, random noise generator, pulse producer;
Wherein,
The primary side of 4 winding transformers is composed in parallel by winding 1 and winding 3, and secondary side is composed in parallel by winding 2 and winding 4; Resistance R1 and telefault L1 connects afterwards and capacitor C1 composes in parallel winding 1; Winding 2 is formed after resistance R2 and telefault L2 is in parallel with adjustable condenser C2 after connecting; Winding 3 is made up of telefault L3, and winding 4 is made up of telefault L4;
One end of power frequency supply, tested device, winding 1 sequentially connects, the other end ground connection of winding 1; Between power frequency supply and tested device, access sampling apparatus, sampling apparatus and winding 3 are connected in parallel; Random noise generator and winding 2 are connected in parallel; Pulse producer and winding 4 are connected in parallel.
2. a kind of low pressure multi-frequency according to claim 1 and amplitude bulk testing source generating means, it is characterized in that, described power frequency supply output power is 10-5000W, and output voltage is 100V-1000V.
3. a kind of low pressure multi-frequency according to claim 1 and amplitude bulk testing source generating means, is characterized in that, described harvester is that three-channel parallel gathers structure, and sample frequency bandwidth is 100MHz.
4. a kind of low pressure multi-frequency according to claim 1 and amplitude bulk testing source generating means, is characterized in that, described pulse producer output pulse width 0.1uS-500uS, voltage magnitude 1-500V.
5. a kind of low pressure multi-frequency according to claim 1 and amplitude bulk testing source generating means, is characterized in that, described random noise generator output power 1-20W.
6. a kind of low pressure multi-frequency according to claim 1 and amplitude bulk testing source generating means, it is characterized in that, described 4 winding transformers, winding shares a high-frequency core structure, each winding is independent winding lamination parcel, be provided with air gap adjusting bolt between each winding, the coupling coefficient between each winding can be regulated.
7. a kind of low pressure multi-frequency according to claim 1 and amplitude bulk testing source generating means, is characterized in that, the material of iron core is soft magnetic ferrite or manganese-zinc ferrite, or nickel-zinc ferrite.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104820137A (en) * | 2015-04-14 | 2015-08-05 | 中国科学院光电研究院 | High-frequency high-voltage fast pulse sequence acquiring device and method thereof |
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| CN104267223B (en) | 2017-01-25 |
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Address after: No. 200, Chacheng Avenue, Simao City, Yunnan Province Patentee after: PUER SUPPLY POWER BUREAU OF YUNNAN POWER GRID Co.,Ltd. Patentee after: GAUSS ELECTRONICS TECHNOLOGY Co.,Ltd. Address before: No. 200, Chacheng Avenue, Simao City, Yunnan Province Patentee before: PU'ER POWER SUPPLY BUREAU OF YUNAN GRID Co.,Ltd. Patentee before: GAUSS ELECTRONICS TECHNOLOGY Co.,Ltd. |
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Effective date of registration: 20210519 Address after: No.200 Chacheng Avenue, Simao District, Pu'er City, Yunnan Province Patentee after: PUER SUPPLY POWER BUREAU OF YUNNAN POWER GRID Co.,Ltd. Address before: No. 200, Chacheng Avenue, Simao City, Yunnan Province Patentee before: PUER SUPPLY POWER BUREAU OF YUNNAN POWER GRID Co.,Ltd. Patentee before: GAUSS ELECTRONICS TECHNOLOGY Co.,Ltd. |