CN2672667Y - Variable frequency type series resonance work frequency anti-pressure test device - Google Patents
Variable frequency type series resonance work frequency anti-pressure test device Download PDFInfo
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- CN2672667Y CN2672667Y CN 200320126587 CN200320126587U CN2672667Y CN 2672667 Y CN2672667 Y CN 2672667Y CN 200320126587 CN200320126587 CN 200320126587 CN 200320126587 U CN200320126587 U CN 200320126587U CN 2672667 Y CN2672667 Y CN 2672667Y
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Abstract
Disclosed is a variable frequency type series resonance industrial frequency anti-pressure test device for testing the insulating ability of the electrical apparatus under the industrial frequency heavy pressure. The utility model mainly solves the problem that the existing series resonance industrial frequency anti-pressure test device is incapable of realizing continuous tuning. The utility model is characterized in that the alternating current voltage output terminal of a converter (2) is connected with the alternating current voltage input terminal of a dry-type excitation transformer (3). The alternating current voltage output terminal of the dry-type excitation transformer (3) is electrically connected with the input wire connecting terminal of a heavy pressure reactor (4). The output wire connecting terminal of the heavy pressure reactor (4) is electrically connected with the top polar plate of a capacitive divider (6). The lower polar plate of the capacitive divider (6) is grounded. The utility model has the advantages of little requirement of tested power source capacitance, small in size, light in weight, few device components, high anti-interference capability, high reliability and environmental protection for the non-oil and dry type. In addition, the variable frequency type series resonance industrial frequency anti-pressure test device realizes continuous tuning and small noise, it is convenient for testing and monitoring.
Description
Technical field:
The utility model relates to a kind of test unit that is used for electrical equipment major insulation intensity such as measuring transformer, mutual inductor, isolating switch, on-load switch, cable, capacitor, reactor, the frequency conversion type series resonance power frequency withstand test device that especially a kind of application series connection resonance principle is measured.
Background technology:
The resonance that takes place in the circuit that resistance, electric capacity, inductance are in series is called series resonance, its condition of resonance is the inverse that the product of power supply frequency and circuit inductance equals the product of power supply frequency and circuit capacitance, as seen, between the electric capacity three of the frequency of power supply, circuit inductance, circuit, regulate one arbitrarily, all can make and satisfy condition of resonance between the three, reach resonance.Using the series resonant circuit principle in the existing series resonance power frequency withstand test technology, to reach the method that reduces the experiment power supply capacity all be inductance and electric capacity based on regulating circuit usually, but the problem of its initiation is to realize by inductance, the electric capacity of regulating circuit when tuning, it is tuning to exist control capacittance can only carry out great-jump-forward, can not realize continuous tuning; And when regulating inductance and realize continuous tuning with tractor, the inductor iron core leakage field is big, noise big, be unfavorable for that test monitors, and wave form distortion is serious, can not satisfy the requirement to experiment power supply.
The utility model content:
In order to overcome the deficiency that the inductance that passes through regulating circuit, the electric capacity that exist in the existing series resonance power frequency withstand test technology carry out can't realizing when tuning continuous tuning, the utility model provides a kind of frequency conversion type series resonance power frequency withstand test device, that this kind frequency conversion type series resonance power frequency withstand test device has is little to the experiment power supply capacity requirement, volume little in light weight, device element quantity is few, antijamming capability is strong, reliability is high, the environmental protection of testing equipment oil-free dry, can realize that continuous tuning, noise are little, be beneficial to the characteristics that test is monitored.
The technical solution of the utility model is: this kind frequency conversion type series resonance power frequency withstand test device, comprise frequency converter, dry excitation transformer, high voltage reactor, capacitive divider, wherein be electrically connected between the ac voltage input of the ac voltage output of frequency converter and dry excitation transformer, be electrically connected between the input wires terminal of the ac voltage output of dry excitation transformer and high voltage reactor, be electrically connected the bottom crown ground connection of capacitive divider between the output wiring terminal of high voltage reactor and the top crown of capacitive divider.
In addition, this kind frequency conversion type series resonance power frequency withstand test device, its frequency converter is made up of rectification, high-voltage inverted, frequency modulation, pressure regulation, output unit; Its high voltage reactor is the combined high-voltage reactor.
The utlity model has following beneficial effect: can be owing to use technical scheme described in the utility model so that desired experiment power supply volume ratio traditional experiment transformer capacity is little 25～45 times, thereby little to the experiment power supply capacity requirement, the scene obtains easily; Set of systems becomes combined type, simplification, integrated, makes that installation weight is light, volume is little, configuration device quantity reduces; Frequency conversion type series resonance power frequency withstand test variable-frequency power sources is a frequency conversion type electric source filter circuit, field power supply is handled once more, eliminate higher hamonic wave, export the qualified waveform of a certain frequency, sinusoidal voltage waveform in this frequency of circuit resonance point output, irregularity of wave form≤1%, it is much smaller than the requirement of the total percent harmonic distortion of 0.38kV voltage≤5% of GB14549-1993 regulation, therefore can provide desirable experiment power supply, guaranteed reliability, the authenticity of test figure, made that power supply quality adaptability is strong, antijamming capability is strong; Frequency conversion type series resonance power frequency withstand test is used the series resonant circuit principle, eliminated uncontrollable self-excitation magnetic phenomenon, eliminated the traditional experiment device and held the big systematic error that rises phenomenon, the control metering is use digital watch meters all, make measuring accuracy height, reliability height; When test specimen flashover or puncture, because condition of resonance is destroyed, test product voltage will descend rapidly in two cycles, and breakdown current is little, 1/ (25～45) of having only the normal test current of test product have been avoided puncturing bigger equipment, the personal safety accident of causing because of test specimen; Frequency modulation is tuning to provide continuous, output frequency is adjustable, the power supply of Adjustable Output Voltage, has satisfied the needs of accurate tuning, continuous tuning, has shortened the test period, in addition its noise little, be beneficial to test and monitor.
Description of drawings:
Accompanying drawing 1 is a composition synoptic diagram of the present utility model;
Accompanying drawing 2 is fundamental diagrams of the utility model frequency converter unit;
Accompanying drawing 3 is the test principle figure when utilizing the utility model to test;
Accompanying drawing 4 is induction-regulated series resonance withstand voltage test measuring principle figure in the prior art;
Accompanying drawing 5 is capacitor tuning type series resonance pressure-resistant experimental measurement schematic diagrams in the prior art;
1-power supply among the figure, 2-frequency converter, 3-dry excitation transformer, 4-high voltage reactor, 5-test product, 6-capacitive divider.
Embodiment:
The utility model is described in further detail below in conjunction with accompanying drawing:
As shown in Figure 1, this kind frequency conversion type series resonance power frequency withstand test device, comprise frequency converter 2, dry excitation transformer 3, high voltage reactor 4, capacitive divider 6, wherein be electrically connected between the ac voltage input of the ac voltage output of frequency converter 2 and dry excitation transformer 3, be electrically connected between the input wires terminal of the ac voltage output of dry excitation transformer 3 and high voltage reactor 4, be electrically connected between the top crown of the output wiring terminal of high voltage reactor 4 and capacitive divider 6, the bottom crown ground connection of capacitive divider 6, the insulation course of product to be tested 5 is connected with ground wire with the output wiring terminal of high voltage reactor 4 respectively with electric conductor when actual the test.
In addition, this kind frequency conversion type series resonance power frequency withstand test device, its frequency converter 2 is by rectification as shown in Figure 2, high-voltage inverted, frequency modulation, pressure regulation, output unit is formed, by the frequency conversion type series resonance power frequency withstand test power supply that this frequency converter constituted is a frequency conversion type electric source filter circuit, it can be handled once more to field power supply, eliminate higher hamonic wave, export the qualified waveform of a certain frequency, sinusoidal voltage waveform in this frequency of circuit resonance point output, irregularity of wave form≤1%, requirement much smaller than the total percent harmonic distortion of 0.38kV voltage≤5% of GB14549-1993 regulation, desirable experiment power supply can be provided, guaranteed the reliability of test figure, authenticity, this is a capacity transfer, the inductance-regulation resonance mode high-technology index that is beyond one's reach.
Existing series resonance application technology principle such as Fig. 4, shown in Figure 5, it mainly is based on the inductance of regulating circuit and electric capacity, but realizes having some problems when tuning by inductance, the electric capacity of regulating circuit, be that control capacittance is can only great-jump-forward tuning, can not realize continuous tuning; When regulating inductance realization continuous tuning with tractor, the inductor iron core leakage field is big, noise big, be unfavorable for the test monitoring, and wave form distortion is serious, can not satisfy the requirement to experiment power supply.
Technical scheme described in the utility model, its principle as shown in Figure 3, promptly by adjusting the frequency of power supply, make it to cooperate the natural resonance frequency of the electric capacity of circuit inductance, circuit, make the product that satisfies condition of resonance power supply frequency and circuit inductance between the three equal the inverse of the product of power supply frequency and circuit capacitance, reach the purpose of series resonance.There are quality factor in the resonant tank, voltage on the test product equals the product of trial voltage and these quality factor, because quality factor can reach between 25～45, therefore the voltage of trial voltage on the test product, the capacity of corresponding supply transformer and pressure regulator also can correspondingly dwindle 25～45 times, can realize that thus the experiment power supply capacity is little, the environmental protection of testing equipment oil-free dry, volume is little, in light weight exempts from handling, noise is low, set of systems becomes combined type, simplification, integrated, is fit to the goal of the invention of mobile operational process.
Stipulate according to GB GB2900.19-94 " electrotechnical terminology high-voltage test techniques and Insulation Coordination ", the frequency of power frequency withstand test power supply is not less than 80% rated frequency, be preferably between 45～65Hz, its voltage waveform should (two half-waves be just the same near sine, and peak value equals √ 2 ± 0.07 with the ratio of effective value, perhaps all harmonic wave effective values be not more than the first-harmonic effective value 5%), therefore, it is feasible adjusting frequency within the specific limits in the high pressure power frequency withstand test, and tuning by frequency modulation in the present invention also is feasible.
By the tuning frequency selectivity that adapts to resonant circuit of frequency modulation, because resonant circuit is a second-order filter circuit in essence, it can remove to select the signal of some needs according to frequency, and get rid of the undesired signal of other frequencies, in practice, use frequency converter to cooperate and can reach very good effect.With transfer that sense is tuning, capacity transfer is tuning compares, frequency modulation is tuning can accomplish fine setting, adjust continuously, finds tuning-points exactly, the resonance output waveform is superior in quality, noiselessness has incomparable advantage.
In realizing the frequency modulation tuning process, be unable to do without the support of Power Electronic Technique, be unable to do without the assurance of superior in quality big electric current, high voltage, may command electronic devices and components.The variable-frequency power sources control technology of power application electronic technology maturation in the present invention; use development in recent years perfect day by day big electric current, high voltage, can turn-off, the insulated gate bipolar transistor IGBT electronic component of high comprehensive performance; and the first-order filtering circuit is set and can needs voltage protection, the current protection set with load variations at mains side; and it is pressure regulator and variable-frequency power sources is partly synthetic; form the variable-frequency power sources control box; provide continuous, output frequency is adjustable, the power supply of Adjustable Output Voltage, has satisfied the needs of continuous tuning.Therefore realize that with frequency modulation is tuning power supply quality adaptability is strong, antijamming capability is strong, high precision, high reliability, low device security risk, the goal of the invention of low personal safety risk.
The frequency conversion voltage adjusting control box integrates pressure regulator and control, frequency converter and control, overvoltage protection and setting, overcurrent protection and setting, first-order filtering, is multi-functional, integrated power operation case;
Reliable and stable big electric current, the high voltage of usability in the frequency converter, can turn-off, the insulated gate bipolar transistor IGBT electronic component of high comprehensive performance, make frequency converter realize the resonant process high voltage appearance, by still adjusting frequency under the load current condition;
Dry excitation transformer must promptly design under the condition smaller or equal to 1.1 teslas at low magnetic density by the square-wave voltage of variable-frequency power sources output;
The dry excitation transformer input end is provided with many group voltage ratio terminals (2000V/200V, 3000V/200V, 4000V/200V, 5000V/200V), selects for use by the system resonance parameter matching in the use;
Select many group high voltage reactors in actual use for use, press system resonance parameter matching selection group number and serial or parallel connection connected mode in the use;
Utilize series resonant circuit frequency selectivity principle, use variable-frequency power sources that the square-wave voltage of a certain frequency is provided, this frequency is identical with the natural resonance frequency of system high pressure reactor, test specimen electric capacity, make when resonance takes place, test specimen obtains sine-shaped ac high voltage, and obtains the high-quality technical indicator of AC sinusoidal voltage irregularity of wave form≤1%;
In actual applications, carry out inductance value electric capacity coupling by table 1, the frequency conversion resonance vibration systematic parameter reaches quality factor 25～45, and frequency is 45～65Hz.
The coupling of table 1 inductance value electric capacity
| Frequency (Hz) | Inductance value (H) | Electric capacity (μ F) | Impedance (Ω) | A/kV |
| 40 | 20 | 0.792 | 5024 | 0.199 |
| 50 | 20 | 0.507 | 6280 | 0.159 |
| 60 | 20 | 0.352 | 7536 | 0.136 |
| 70 | 20 | 0.258 | 8792 | 0.114 |
Use series connection resonant vibration frequency conversion tuned circuit principle, power application electronic technology variable-frequency power sources control technology on the realization means, both have complementary advantages, finished the research work that high pressure power frequency Insulation Test field new technology is used, developed novel testing equipment, goal of the invention has been finished in the test of realization safety and precise satisfactorily.
When application the utility model carries out voltage-withstand test; should be by the electric capacity of test specimen, withstand voltage standard, current value; set overvoltage, overcurrent protection, select the mode of connection, connect the tie lines of ground wire, power lead, exciting transformer, high voltage reactor, test product and capacitive divider.
Energized then, the resonant frequency range that the knob of adjusting frequency makes output frequency approach to calculate, adjust the exciting transformer output voltage to the 50V, the careful output frequency of regulating, test product voltage is peaked, use the voltage of the knob rising exciting transformer that boosts to reach the prerun withstand voltage until test specimen.
The beneficial effect that the utility model had can be confirmed by following experimental data:
1., traditional power frequency withstand test device application examples:
Testing transformer capacity 100kVA, voltage ratio 100kV/220V, current ratio 1A/454.5A, test product electric current I cx=ω UC, f-50Hz, U-trial voltage, C-test product ground capacitance; Source current I=454.5Icx.
2., frequency conversion type series resonance power frequency withstand test device application example:
Test product electric current I cx=ω UC, f-45～65Hz, U-trial voltage, C-test product ground capacitance, source current I free list meter directly read (check as calculated and conform to), nominal supply voltages 220V, 50Hz.
| SFPSZ7- 50000/110 | 49.4 | 257/5.1 4 | 53.2 | 384/5. 76 | 51 | 117.6/0 .59 |
| SFSZ7- 40000/110 | 50.5 | 252.5/5 .05 | 54.9 | 373/5. 6 | 53.7 | 111/0.5 6 |
Show by two table numeral contrasts, equal electric capacity is tried under the voltage same case, the required source current of frequency conversion type series resonance power frequency withstand test device on average reduces by 22.5 times, required power supply useful power reduces by 22.5 times simultaneously, above-mentioned test can use daily power supply to finish fully, and this is the favorable factor that frequency conversion type series resonance power frequency withstand test device is promoted the use of.After compensating at the frequency conversion voltage adjusting power supply, experiment power supply volume ratio traditional experiment transformer is little 25～50 times.
3., operation in the open air, newly-built electric substation construction site, power supply is interim power supply, has a large amount of nonlinear loads, the power supply wave shape distortion is serious, includes the higher hamonic wave rate and surpasses deviation range, and the power supply quality of test is worsened, and causes test normally not carry out.As the newly-built electric substation construction site power supply wave shape serious phenomenon (reaching 15% through waveform testing authentication irregularity of wave form) that distorts repeatedly took place in 2003, traditional power frequency withstand test device can not be finished test, has finished test and use frequency conversion type series resonance power frequency withstand test device to substitute the back very wellly.
Use series connection resonant vibration frequency conversion tuned circuit principle, power application electronic technology variable-frequency power sources control technology on the realization means, both have complementary advantages, finished the research work that high pressure power frequency Insulation Test field new technology is used, developed novel testing equipment, goal of the invention has been finished in the test of realization safety and precise satisfactorily.
Claims (3)
1, a kind of frequency conversion type series resonance power frequency withstand test device, comprise frequency converter (2), dry excitation transformer (3), high voltage reactor (4), capacitive divider (6), it is characterized in that: be electrically connected between the ac voltage input of the ac voltage output of frequency converter (2) and dry excitation transformer (3), be electrically connected between the input wires terminal of the ac voltage output of dry excitation transformer (3) and high voltage reactor (4), be electrically connected the bottom crown ground connection of capacitive divider (6) between the top crown of the output wiring terminal of high voltage reactor (4) and capacitive divider (6).
2, a kind of frequency conversion type series resonance power frequency withstand test device according to claim 1 is characterized in that: frequency converter (2) is made up of rectification, high-voltage inverted, frequency modulation, pressure regulation, output unit.
3, a kind of frequency conversion type series resonance power frequency withstand test device according to claim 1 and 2, it is characterized in that: high voltage reactor (4) is the combined high-voltage reactor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200320126587 CN2672667Y (en) | 2003-12-08 | 2003-12-08 | Variable frequency type series resonance work frequency anti-pressure test device |
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| CN 200320126587 CN2672667Y (en) | 2003-12-08 | 2003-12-08 | Variable frequency type series resonance work frequency anti-pressure test device |
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| CN2672667Y true CN2672667Y (en) | 2005-01-19 |
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| CN 200320126587 Expired - Fee Related CN2672667Y (en) | 2003-12-08 | 2003-12-08 | Variable frequency type series resonance work frequency anti-pressure test device |
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Cited By (16)
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| CN100347554C (en) * | 2005-08-04 | 2007-11-07 | 上海思源电气股份有限公司 | No partial discharge frequency conversion resonance experiment system |
| CN101206242B (en) * | 2007-12-19 | 2010-06-09 | 湖南大学 | Method for controlling voltage and frequency of FM resonance type extra-high voltage test power supply |
| CN102243288A (en) * | 2011-04-27 | 2011-11-16 | 丁鑫龙 | Frequency modulated series resonance withstand voltage detection device based on equal pulse width pulse-width modulation (PWM) control |
| CN102735997A (en) * | 2012-06-19 | 2012-10-17 | 扬州市双宝电力设备有限公司 | Series resonance withstanding voltage tester |
| CN103105565A (en) * | 2011-11-09 | 2013-05-15 | 丁一舟 | Series resonance voltage-withstanding partial-discharge test method utilizing frequency modulation phase shift |
| CN103389442A (en) * | 2012-05-07 | 2013-11-13 | 四川聚友生态农业科技有限公司 | Transformer substation electrical device alternating current withstand voltage resonance testing device |
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| CN104035013A (en) * | 2014-05-30 | 2014-09-10 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | 500 KV electromagnetic voltage transformer alternating-current frequency-doubling withstand voltage test circuit and method |
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| CN104459501A (en) * | 2014-12-25 | 2015-03-25 | 中国西电电气股份有限公司 | Lightning arrester power frequency testing device and method |
| CN106841936A (en) * | 2016-11-23 | 2017-06-13 | 国家电网公司 | Variable-frequency series-resonance method AC power frequency pressure test checking system and method |
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- 2003-12-08 CN CN 200320126587 patent/CN2672667Y/en not_active Expired - Fee Related
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| CN100347554C (en) * | 2005-08-04 | 2007-11-07 | 上海思源电气股份有限公司 | No partial discharge frequency conversion resonance experiment system |
| CN101206242B (en) * | 2007-12-19 | 2010-06-09 | 湖南大学 | Method for controlling voltage and frequency of FM resonance type extra-high voltage test power supply |
| CN102243288B (en) * | 2011-04-27 | 2013-04-17 | 丁鑫龙 | Frequency modulated series resonance voltage-withstand detection device based on equal pulse width pulse-width modulation (PWM) control |
| CN102243288A (en) * | 2011-04-27 | 2011-11-16 | 丁鑫龙 | Frequency modulated series resonance withstand voltage detection device based on equal pulse width pulse-width modulation (PWM) control |
| CN103105565B (en) * | 2011-11-09 | 2015-07-08 | 丁一舟 | Series resonance voltage-withstanding partial-discharge test method utilizing frequency modulation phase shift |
| CN103105565A (en) * | 2011-11-09 | 2013-05-15 | 丁一舟 | Series resonance voltage-withstanding partial-discharge test method utilizing frequency modulation phase shift |
| CN104136931A (en) * | 2012-02-27 | 2014-11-05 | 赖茵豪森机械制造公司 | Test system and method for testing high-voltage technology devices |
| JP2015513081A (en) * | 2012-02-27 | 2015-04-30 | マシイネンフアブリーク・ラインハウゼン・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | Test system and method for testing high voltage technology equipment |
| EP2820434A1 (en) * | 2012-02-27 | 2015-01-07 | Maschinenfabrik Reinhausen GmbH | Test system and method for testing high-voltage technology devices |
| CN103389442A (en) * | 2012-05-07 | 2013-11-13 | 四川聚友生态农业科技有限公司 | Transformer substation electrical device alternating current withstand voltage resonance testing device |
| CN102735997A (en) * | 2012-06-19 | 2012-10-17 | 扬州市双宝电力设备有限公司 | Series resonance withstanding voltage tester |
| CN103969499A (en) * | 2013-01-31 | 2014-08-06 | 山东电力集团公司物资供应公司 | Three-phase capacitor voltage division measuring device and method |
| CN103969499B (en) * | 2013-01-31 | 2016-08-10 | 山东电力集团公司物资供应公司 | A kind of three phase capacitance partial pressure measuring apparatus and measuring method |
| CN103576062A (en) * | 2013-10-25 | 2014-02-12 | 中国一冶集团有限公司 | Wireless frequency conversion resonance withstand voltage testing device and testing method thereof |
| CN103576062B (en) * | 2013-10-25 | 2016-04-20 | 中国一冶集团有限公司 | Wireless changing resonant withstand voltage testing device and test method thereof |
| CN104035013A (en) * | 2014-05-30 | 2014-09-10 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | 500 KV electromagnetic voltage transformer alternating-current frequency-doubling withstand voltage test circuit and method |
| CN104459501A (en) * | 2014-12-25 | 2015-03-25 | 中国西电电气股份有限公司 | Lightning arrester power frequency testing device and method |
| CN106841936A (en) * | 2016-11-23 | 2017-06-13 | 国家电网公司 | Variable-frequency series-resonance method AC power frequency pressure test checking system and method |
| CN110703059A (en) * | 2019-11-13 | 2020-01-17 | 上海恒能泰企业管理有限公司璞能电力科技工程分公司 | Device for improving tuning stability of series resonance test under small load |
| WO2021093352A1 (en) * | 2019-11-13 | 2021-05-20 | 上海恒能泰企业管理有限公司璞能电力科技工程分公司 | Apparatus for improving tuning stability of series resonance test under small load |
| CN110703059B (en) * | 2019-11-13 | 2021-08-17 | 上海恒能泰企业管理有限公司璞能电力科技工程分公司 | Device for improving tuning stability of series resonance test under small load |
| CN112649730A (en) * | 2020-12-04 | 2021-04-13 | 国网新疆电力有限公司电力科学研究院 | Simulated load device and series resonance simulation test system based on same |
| CN113109684A (en) * | 2021-05-25 | 2021-07-13 | 西安热工研究院有限公司 | Large-scale steam turbine generator power frequency alternating current withstand voltage test device and method |
| CN115877152A (en) * | 2023-02-27 | 2023-03-31 | 国网江西省电力有限公司电力科学研究院 | Power frequency resonance system and method for detecting insulation state of transmission cable |
| CN115877152B (en) * | 2023-02-27 | 2023-07-04 | 国网江西省电力有限公司电力科学研究院 | Power frequency resonance system and method for detecting insulation state of power transmission cable |
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| CF01 | Termination of patent right due to non-payment of annual fee |