CN101477183A - Intelligent non-partial discharge extra-high voltage sine-wave modulation pressure-resistant apparatus - Google Patents
Intelligent non-partial discharge extra-high voltage sine-wave modulation pressure-resistant apparatus Download PDFInfo
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- CN101477183A CN101477183A CNA2009100425640A CN200910042564A CN101477183A CN 101477183 A CN101477183 A CN 101477183A CN A2009100425640 A CNA2009100425640 A CN A2009100425640A CN 200910042564 A CN200910042564 A CN 200910042564A CN 101477183 A CN101477183 A CN 101477183A
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Abstract
Te invention relates to an intelligent type partial discharge-free ultrahigh voltage sine wave modulation voltage resistance device. The device comprises a frequency conversion power unit, a middle excitation boosting transformer and a serial resonant circuit which are sequentially connected in series; the frequency conversion power unit commutates and inverts 380V triphase current, obtains and outputs single-phase frequency-adjustable alternating current, and the 380V triphase current is boosted to 1kV around by the middle excitation boosting transformer; the output of the middle excitation boosting transformer is connected with the serial resonant circuit; the serial resonant circuit comprises a resonant reactor L1 and a voltage divider; a capacitor Cx of a tested article and the voltage divider are in parallel connection; a secondary end of the voltage divider is connected with a high voltage measuring meter and a protection device respectively; and the high voltage measuring meter and the protection device are connected with feedback ends of the frequency conversion power unit. The device is the intelligent type partial discharge-free ultrahigh voltage sine wave modulation voltage resistance device which has a simple and compact structure, simple operation and wide application range, can meet requirements of voltage resistance and partial discharge test of ultrahigh voltage electric equipment.
Description
Technical field
The present invention is mainly concerned with the high-pressure test device field, refers in particular to a kind of intelligent non-partial discharge extra-high voltage sine-wave modulation pressure-resistant device.
Background technology
The whole world has only Russia and Japan to build 1000KV ultra-high voltage AC transmission engineering at present, but it is also less to be used for the withstand voltage test unit of field apparatus.In China, the southeast-Nanyang, 1000 kilovolts of Shanxi of Asia article one-Jingmen extra-high-voltage alternating current experiment and demonstration engineering work transmission line is in beginning foundation construction on June 28th, 2007; Finish the iron tower vertical construction in by the end of April, 2008, finish lead wire and earth wire and OPGW optical cable tension stringing and annex installation work construction task mid-August.
To be used for the partial discharge test power-supply device of transformer abroad and be used as the AC voltage withstand test power-supply device is what to separate.The transformer partial discharge test is to utilize the intermediate frequency generator group to give the HT testing transformer excitation.The intermediate frequency generator group is a rotation, the nonadjustable supply unit of frequency, and reactive-load compensation will rely on the mode of outer distribution sense, and the starting current of device is very big, and corollary apparatus is many and heavy, equipment transportation, inconvenient operation.The resonance pressure-resistant device is mainly used in the AC voltage withstand test of high-tension apparatus, the test unit of producing with Haefely company is representative, its principle is to utilize the iron core gap distance of regulating resonance reactor inside mostly, and the electric capacity that changes inductance parameters and tested frequency is realized series resonance, produces high pressure output.This installation weight is huge, and is difficult in maintenance, and only suitable experiment hall uses, and is not suitable for site test.
Domestic experiment power supply adopts the frequency conversion of intermediate frequency generator group mostly during the eighties, began to adopt the resonant power device in 90 years, great majority are adopted the PWM modulation, produce the sine wave of frequency adjustable, but the high-frequency signal that PWM modulation itself produces is typically to disturb in the partial discharge test, and therefore this device is not suitable for partial discharge test.
Summary of the invention
The problem to be solved in the present invention just is: at the technical matters that prior art exists, the invention provides a kind of simple and compact for structure, easy and simple to handle, applied widely, can satisfy that the extra-high voltage electrical equipment is withstand voltage, the intelligent non-partial discharge extra-high voltage sine-wave modulation pressure-resistant device of local discharge test demand.
For solving the problems of the technologies described above, the solution that the present invention proposes is: a kind of intelligent non-partial discharge extra-high voltage sine-wave modulation pressure-resistant device, it is characterized in that: it comprises variable-frequency power sources unit, middle excitation step-up transformer and the series resonant circuit of series connection successively, described variable-frequency power sources unit obtains the interchange output of single-phase Frequency Adjustable after with the three-phase current rectification of 380v, inversion, boost to about 1kV by middle excitation step-up transformer, the output of middle excitation step-up transformer links to each other with series resonant circuit; Described series resonant circuit comprises resonance reactor L
1And voltage divider, test specimen capacitor C x is in parallel with voltage divider, and the secondary terminals of voltage divider links to each other with protective device with the measurement high pressure gauge respectively, and described measurement high pressure gauge links to each other with the feedback end of protective device with the variable-frequency power sources unit.
Described variable-frequency power sources unit comprises main control unit, signal source, prime power amplification unit and back level power amplification unit, described signal source is used to provide the pure sine wave of Frequency Adjustable, and main control unit flows to series resonant circuit through prime power amplification unit, a back grade power amplification unit after with its synthetic output successively.
The output terminal of described back level power amplification unit is provided with the RC filter unit, and described RC filter unit comprises the 5th capacitor C that is parallel to back level power amplification unit output terminal two inter-stages
6And the 6th capacitor C that links to each other with back level power amplification unit output terminal two-stage respectively
4With the 4th capacitor C
5, the 6th capacitor C
4With the 4th capacitor C
5Respectively with first resistance R
1With second resistance R
2Series connection.
Described voltage divider is by first capacitor C
1, second capacitor C
2, the 3rd capacitor C
3Be in series a voltage divider and a pressure measurement capacitor C successively
0Series connection, voltage divider are used to provide compensation and measure the voltage of series resonant circuit.
Compared with prior art, advantage of the present invention just is:
1, the present invention have simple and compact for structure, easy and simple to handle, applied widely, can satisfy advantages such as the extra-high voltage electrical equipment is withstand voltage, local discharge test demand;
2, the present invention has guaranteed that the signal that power cabinet output produces is the sine wave of frequency adjustable, no harmonic wave, reference waveform.The present invention is by the feedback sample to the output signal current/voltage, reach the intelligent search of system resonance Frequency point and determining of frequency change step sizes, thereby realize the automatic frequency adjustment pressure regulation of system and device, satisfy the voltage request of withstand voltage test or local discharge test, and can carry out quick, intelligent control protection according to the flashover or earthy the raising of electric current and voltage amount;
3, the present invention has realized the total digitalization of control system, and the frequency modulation precision reaches 0.1Hz, and has overcurrent, overvoltage and arc protection.The present invention adopts optical fiber transmission technique, improve the reliability of safety of operators and test unit, in the high voltage measuring system, realize photoelectricity isolation and optical fiber measurement, thereby the effectively phase mutual interference between the erasure signal guarantees the real undistorted transmission of signal;
4, the present invention can satisfy the AC voltage withstand test of crosslinked cable of AC voltage withstand test, 1000KV and following electric pressure of GIS combined electrical apparatus of ac voltage withstanding local discharge test, 1000KV and the following electric pressure of the switchgear of the partial discharge test of main-transformer of 1000KV and following electric pressure and induced over voltage withstand test, 1000KV and following electric pressure and mutual inductor etc.;
Description of drawings
Fig. 1 is a structural principle synoptic diagram of the present invention;
Fig. 2 is the framed structure synoptic diagram of variable-frequency power sources unit among the present invention;
Fig. 3 is the circuit theory synoptic diagram of variable-frequency power sources unit among the present invention;
Fig. 4 is the circuit theory synoptic diagram of RC filter unit among the present invention.
Marginal data
1, variable-frequency power sources unit 2, middle excitation step-up transformer
3, series resonant circuit 4, measurement high pressure gauge
101, main control unit 102, signal source
103, prime power amplification unit 104, back level power amplification unit
105, protective device 106, RC filter unit
Embodiment
Below with reference to the drawings and specific embodiments the present invention is described in further details.
When capacitive load in the circuit is connected with inductive load, if change the frequency of input AC, make capacitive reactance equal induction reactance, the loop will produce resonance, the load both end voltage will raise several times to tens times, and the present invention promptly utilizes this principle to realize withstand voltage and local discharge test to extra-high voltage.As Fig. 1, Fig. 2 and shown in Figure 3, intelligent non-partial discharge extra-high voltage sine-wave modulation pressure-resistant device of the present invention, it comprises successively variable-frequency power sources unit 1, middle excitation step-up transformer 2 and the series resonant circuit 3 of series connection, and variable-frequency power sources unit 1 obtains the interchange output (voltage: 0～365v of single-phase Frequency Adjustable after with the three-phase current rectification of 380v, inversion; Peak power: 600kw; Frequency: adjustable arbitrarily between 30～300hz), boost to about 1kV by middle excitation step-up transformer 2, the output of middle excitation step-up transformer 2 links to each other with series resonant circuit 3; Described series resonant circuit 3 comprises resonance reactor L
1And voltage divider, test specimen capacitor C x is in parallel with voltage divider, and the secondary terminals of voltage divider links to each other with protective device 105 with measurement high pressure gauge 4 respectively, measures high pressure gauge 4 and links to each other with the feedback end of protective device 105 with variable-frequency power sources unit 1.Variable-frequency power sources unit 1 comprises main control unit 101, signal source 102, prime power amplification unit 103 and back level power amplification unit 104, signal source 102 is used to provide the pure sine wave of Frequency Adjustable, main control unit 101 flows to series resonant circuit 3 through prime power amplification unit 103, a back grade power amplification unit 104 after with its synthetic output successively, its core adopts DSP control DDS frequency synthesizer to finish, and measures high pressure gauge 4 and links to each other with the feedback end of main control unit 101 by the optical fiber measurement system.Be amplified to 100w through prime power amplification unit 103, back level power amplification unit 104 is amplified to 600kw and exports to series resonant circuit 3, and two-stage all adopts the linear power based on the high-quality triode to amplify mode.The measurement, the control that have power cabinet output voltage, electric current with DSP for the control core system, and function such as overvoltage, overcurrent, arc protection, it obtains the voltage signal of voltage divider in the series resonant circuit 3 by photoeletric measuring system.For making the signal of sending into power amplification circuit is the smooth sine wave that does not have harmonic wave and burr, native system is finished by dsp chip and is gathered and analyze data, intelligent control algorithm, aspect a ripple, what adopt is DDS numerical frequency synthesis chip, its output be digitized sine wave, obtain an available analog frequency signal through high-speed d/a converter and low-pass filter.Power amplification circuit is made up of multistage power amplifier in this device, device is that large power triode belongs to less sub-semiconductor devices, therefore no matter when opening or turn-off, the capital produces transient voltage and electric current, electromagnetic noise interference by lead-in inductance formation wideband comprises common mode interference and differential mode interference.Main control unit 101 adopts TMS320LF2407; its COTROL port links to each other with protective device 105 with measurement high pressure gauge 4 by the MAX125 sample circuit; the I/O interface links to each other with the topworks of protection systems such as divide-shut brake control, warning respectively, and links to each other with expansion input, output interface by the photoelectricity isolated location.Referring to Fig. 4, in the present embodiment, the output terminal of back level power amplification unit 104 is provided with RC filter unit 106, and described RC filter unit 106 comprises the 5th capacitor C that is parallel to back level power amplification unit 104 output terminals two inter-stages
6And respectively with the 6th capacitor C of back level power amplification unit 104 output terminal two-stages
4With the 4th capacitor C
5, the 6th capacitor C
4With the 4th capacitor C
5Respectively with first resistance R
1With second resistance R
2Series connection.Wherein resistance is noninductive resistance, the 6th capacitor C
4With the 4th capacitor C
5Be polyethylene capacitor, the 5th capacitor C
6Be ceramic condenser.The common port of filter unit and ground are linked together, and the advantage of doing like this is to make the dv/dt of output voltage obtain the symmetry inhibition.This structure can filter out common mode interference, thereby makes that output waveform is pure sine wave.In the present embodiment, voltage divider is by first capacitor C
1, second capacitor C
2, the 3rd capacitor C
3Be in series a voltage divider and a pressure measurement capacitor C successively
0Series connection, voltage divider are used to provide compensation and measure the voltage of series resonant circuit 3.
Principle of work: by the sinusoidal wave chip AD9832 output voltage 10V (adjustable amplitude value) that produces of dsp processor control, frequency is adjustable continuously in 30～300Hz, power is about the standard sine signal about 1W, and the degree of regulation of its frequency reaches 0.1Hz, and the distortion of output waveform is less than or equal to 1%.After the power amplification of first order TDA2030 integrated circuit, the sinusoidal signal output power reaches about 10W, subsequently, after the bridge amplification circuit amplification of forming by thousands of large power triodes, the rated power that sinusoidal signal power finally reaches (can reach hundreds of kilowatts), output voltage 400V is with interior adjustable continuously.Sinusoidal signal is after excitation is boosted at this moment, and the electric pressure of exporting after amplifying through the extra-high voltage resonant circuit again can satisfy extra-high-voltage alternating current and test needs.
With 500KV SF6 isolating switch AC voltage withstand test is example:
The 1:600KW variable frequency power source output of variable-frequency power sources unit 0-365V, 1600A, 30-300HZ
Tuning coil: be 170H/300KV * 4
C1: be resonant capacitance 3000Pf/300KV * 4
C2: be voltage divider low-voltage arm electric capacity 2.5uf/600V
By regulating the output frequency and the output voltage of variable-frequency power sources unit 1, work as U
ADuring=10KV, at U
BPoint produces the test required voltage (referring to Fig. 1) of 544KV.
The above only is a preferred implementation of the present invention, and protection scope of the present invention also not only is confined to the foregoing description, and all technical schemes that belongs under the thinking of the present invention all belong to protection scope of the present invention.Should be pointed out that for those skilled in the art in the some improvements and modifications that do not break away under the principle of the invention prerequisite, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (4)
1, a kind of intelligent non-partial discharge extra-high voltage sine-wave modulation pressure-resistant device, it is characterized in that: it comprises variable-frequency power sources unit (1), middle excitation step-up transformer (2) and the series resonant circuit (3) of series connection successively, described variable-frequency power sources unit (1) obtains the interchange output of single-phase Frequency Adjustable after with the three-phase current rectification of 380v, inversion, boost to about 1kV by middle excitation step-up transformer (2), the output of middle excitation step-up transformer (2) links to each other with series resonant circuit (3); Described series resonant circuit (3) comprises resonance reactor L
1And voltage divider, test specimen capacitor C x is in parallel with voltage divider, and the secondary terminals of voltage divider links to each other with protective device (105) with measurement high pressure gauge (4) respectively, and described measurement high pressure gauge (4) links to each other with the feedback end of protective device (105) with variable-frequency power sources unit (1).
2, intelligent non-partial discharge extra-high voltage sine-wave modulation pressure-resistant device according to claim 1, it is characterized in that: described variable-frequency power sources unit (1) comprises main control unit (101), signal source (102), prime power amplification unit (103) and back level power amplification unit (104), described signal source (102) is used to provide the pure sine wave of Frequency Adjustable, and main control unit (101) flows to series resonant circuit (3) through prime power amplification unit (103), a back grade power amplification unit (104) after with its synthetic output successively.
3, intelligent non-partial discharge extra-high voltage sine-wave modulation pressure-resistant device according to claim 2, it is characterized in that: the output terminal of described back level power amplification unit (104) is provided with RC filter unit (106), and described RC filter unit (106) comprises the 5th capacitor C that is parallel to back level power amplification unit (104) output terminal two inter-stages
6And the 6th capacitor C that links to each other with back level power amplification unit (104) output terminal two-stage respectively
4With the 4th capacitor C
5, the 6th capacitor C
4With the 4th capacitor C
5Respectively with first resistance R
1With second resistance R
2Series connection.
4, according to claim 1 or 2 or 3 described intelligent non-partial discharge extra-high voltage sine-wave modulation pressure-resistant devices, it is characterized in that: described voltage divider is by first capacitor C
1, second capacitor C
2, the 3rd capacitor C
3Be in series a voltage divider and a pressure measurement capacitor C successively
0Series connection, voltage divider are used to provide compensation and measure the voltage of series resonant circuit (3).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100425640A CN101477183A (en) | 2009-01-20 | 2009-01-20 | Intelligent non-partial discharge extra-high voltage sine-wave modulation pressure-resistant apparatus |
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|---|---|---|---|
| CNA2009100425640A CN101477183A (en) | 2009-01-20 | 2009-01-20 | Intelligent non-partial discharge extra-high voltage sine-wave modulation pressure-resistant apparatus |
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| CN101477183A true CN101477183A (en) | 2009-07-08 |
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| CN102590717A (en) * | 2012-02-14 | 2012-07-18 | 重庆市电力公司电力科学研究院 | Withstand voltage testing method for geographic information system (GIS) |
| 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 |
| CN102818977A (en) * | 2012-08-24 | 2012-12-12 | 南京思能电气有限公司 | Industrial frequency resonance voltage resistance test container system for electric power equipment |
| TWI391693B (en) * | 2009-12-03 | 2013-04-01 | Tatung Co | Frequency regulated voltage generation device applied in a high-voltage reactor voltage test and transformer sensing and partial discharge test |
| CN103197220A (en) * | 2013-04-12 | 2013-07-10 | 国家电网公司 | 200kV frequency modulating capacity modulating series resonance voltage boosting device |
| CZ304501B6 (en) * | 2013-06-21 | 2014-05-28 | Jaroslav Plocek | Load tester of power capacitors |
| CN103837804A (en) * | 2014-02-27 | 2014-06-04 | 苏州华电电气股份有限公司 | Mobile gas insulation non-partial-discharge voltage holding test system |
| CN104111412A (en) * | 2014-06-30 | 2014-10-22 | 国家电网公司 | Protection connection structure for preventing components in variable frequency power cabinet from flashover impact of tested object |
| CN104242255A (en) * | 2014-10-11 | 2014-12-24 | 国网重庆市电力公司电力科学研究院 | GIS (gas insulated switchgear) same-frequency same-phase alternating-current voltage withstand test control protection method and system |
| WO2016033713A1 (en) * | 2014-09-05 | 2016-03-10 | 国家电网公司 | Non-line frequency operation mode gis device partial discharge defect simulation apparatus |
| CN108896885A (en) * | 2018-07-11 | 2018-11-27 | 云南电网有限责任公司电力科学研究院 | A kind of distribution transformer shelf depreciation and over-voltage monitoring equipment |
| CN110398674A (en) * | 2019-08-30 | 2019-11-01 | 国网山西省电力公司电力科学研究院 | A kind of extra-high voltage parallel reactance is pressure-resistant and local discharge test device |
| CN111693835A (en) * | 2020-06-19 | 2020-09-22 | 国网北京市电力公司 | Power frequency triple frequency conversion three-in-one integrated partial discharge-free test power supply |
| CN112485624A (en) * | 2020-12-10 | 2021-03-12 | 广东电网有限责任公司 | Partial discharge-free test power supply circuit |
| CN113009299A (en) * | 2021-03-11 | 2021-06-22 | 国网陕西省电力公司电力科学研究院 | Cable voltage resistance and partial discharge integrated test system and operation method thereof |
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| TWI391693B (en) * | 2009-12-03 | 2013-04-01 | Tatung Co | Frequency regulated voltage generation device applied in a high-voltage reactor voltage test and transformer sensing and partial discharge test |
| CN102590717A (en) * | 2012-02-14 | 2012-07-18 | 重庆市电力公司电力科学研究院 | Withstand voltage testing method for geographic information system (GIS) |
| CN102590717B (en) * | 2012-02-14 | 2014-04-23 | 重庆市电力公司电力科学研究院 | Withstand voltage testing method for geographic information system (GIS) |
| 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 |
| CN102818977A (en) * | 2012-08-24 | 2012-12-12 | 南京思能电气有限公司 | Industrial frequency resonance voltage resistance test container system for electric power equipment |
| CN103197220A (en) * | 2013-04-12 | 2013-07-10 | 国家电网公司 | 200kV frequency modulating capacity modulating series resonance voltage boosting device |
| CZ304501B6 (en) * | 2013-06-21 | 2014-05-28 | Jaroslav Plocek | Load tester of power capacitors |
| CN103837804A (en) * | 2014-02-27 | 2014-06-04 | 苏州华电电气股份有限公司 | Mobile gas insulation non-partial-discharge voltage holding test system |
| CN104111412A (en) * | 2014-06-30 | 2014-10-22 | 国家电网公司 | Protection connection structure for preventing components in variable frequency power cabinet from flashover impact of tested object |
| WO2016033713A1 (en) * | 2014-09-05 | 2016-03-10 | 国家电网公司 | Non-line frequency operation mode gis device partial discharge defect simulation apparatus |
| CN104242255A (en) * | 2014-10-11 | 2014-12-24 | 国网重庆市电力公司电力科学研究院 | GIS (gas insulated switchgear) same-frequency same-phase alternating-current voltage withstand test control protection method and system |
| CN104242255B (en) * | 2014-10-11 | 2017-04-05 | 国网重庆市电力公司电力科学研究院 | A kind of GIS is with the ac voltage withstanding controlling test guard method of frequency homophase and system |
| CN108896885A (en) * | 2018-07-11 | 2018-11-27 | 云南电网有限责任公司电力科学研究院 | A kind of distribution transformer shelf depreciation and over-voltage monitoring equipment |
| CN110398674A (en) * | 2019-08-30 | 2019-11-01 | 国网山西省电力公司电力科学研究院 | A kind of extra-high voltage parallel reactance is pressure-resistant and local discharge test device |
| CN111693835A (en) * | 2020-06-19 | 2020-09-22 | 国网北京市电力公司 | Power frequency triple frequency conversion three-in-one integrated partial discharge-free test power supply |
| CN112485624A (en) * | 2020-12-10 | 2021-03-12 | 广东电网有限责任公司 | Partial discharge-free test power supply circuit |
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| CN113640626A (en) * | 2021-07-06 | 2021-11-12 | 国网浙江省电力有限公司营销服务中心 | Extra-high voltage direct current partial discharge suppression system and method |
| CN113640626B (en) * | 2021-07-06 | 2022-03-22 | 国网浙江省电力有限公司 | Extra-high voltage direct current partial discharge suppression system and method |
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Open date: 20090708 |