CN202041624U - Direct-current high-voltage test integrated device for internal water cooling generator - Google Patents
Direct-current high-voltage test integrated device for internal water cooling generator Download PDFInfo
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- CN202041624U CN202041624U CN2010206852712U CN201020685271U CN202041624U CN 202041624 U CN202041624 U CN 202041624U CN 2010206852712 U CN2010206852712 U CN 2010206852712U CN 201020685271 U CN201020685271 U CN 201020685271U CN 202041624 U CN202041624 U CN 202041624U
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Abstract
The utility model relates to a direct-current high-voltage test integrated device for an internal water cooling generator, which comprises a slow starting circuit, a rectification filter circuit, a pressure-regulating and voltage-stabilizing circuit, a filter circuit, a power bridge type inverter circuit, a high-power intermediate-frequency transformer and a full wave voltage-multiplying rectification circuit, wherein the rectification filter circuit is connected with the output end of the slow starting circuit; the pressure-regulating and voltage-stabilizing circuit is connected with the output of the rectification filter circuit; the filter circuit is connected with the output of the pressure-regulating and voltage-stabilizing circuit; the input of the power bridge type inverter circuit is electrically connected with the output of the filter circuit; the input of the high-power intermediate-frequency transformer is electrically connected with the output of the power bridge type inverter circuit; and the input of the full wave voltage-multiplying rectification circuit is electrically connected with the output of the high-power intermediate-frequency transformer. According to the scheme of the utility model, the direct-current high-voltage test integrated device for the internal water cooling generator has the advantages that wiring is simple; polarization compensation is carried out in the manner of digital record; high voltage, high-voltage total current and leakage current of each point are automatically recorded; the data average value of the leakage current is sampled to prevent peak current from being misread and the like.
Description
Technical field
The utility model relates to a kind of DC high potential test device, and particularly a kind of water-cooled generator DC high potential test integration unit belongs to the electrical Instrument technology field.
Background technology
The DC voltage withstand test of water-cooled generator stator winding and no external the blowing under water or two kinds of conditions of water flowing of dc leakage-current test are carried out.Blow and do experiment under the regimen condition because due to the structure of 300,000 units, its bottom ponding is difficult to dry up.Therefore very consuming time, blow the water time even reach more than the week.Prolonged overhaul stop time.If it is not thorough to blow water, not only can brings measuring error, and, the danger that damages winding just be arranged just in case test the time causes arcing in the coil.Do experiment under the water flowing situation and adopt at present ac test to become or resonance change and silicon stack, electric capacity combination, and will other feeder apparatus to compensation that polarizes such as collection pipes.Equipment heaviness, dispersion, the wiring complexity; Test findings is subjected to water quality impact, and AC ripple is bigger, and the microampere meter fluctuation is big, reading is difficult.
The utility model content
The utility model purpose be proposed in order to overcome the deficiencies in the prior art a kind of under the water flowing situation, the output low-ripple coefficient, adopt complete specialized equipment light, simply, the lv shielded method water-cooled generator DC high potential test integration unit tested under the prerequisite accurately.
For achieving the above object, the technical solution adopted in the utility model is: a kind of water-cooled generator DC high potential test integration unit comprises slow-start circuit, current rectifying and wave filtering circuit, voltage-regulation voltage-stabilization circuit, filtering circuit, power bridge inverter main circuit, high-power medium-frequency transformer, full-wave voltage doubler; The input power supply charges to the percussive action of input power supply for reducing filtering through the slow-start circuit, described current rectifying and wave filtering circuit is connected the alternating current that slow-start is sent here with the output terminal of slow-start circuit and is converted to direct current, described voltage-regulation voltage-stabilization circuit is connected with the output of current rectifying and wave filtering circuit and converts direct current to adjustable direct current high frequency modulated ripple, the output of described filtering circuit and voltage-regulation voltage-stabilization circuit is connected and converts adjustable direct current modulating wave to direct current, the direct current that the input of described power bridge inverter main circuit is electrically connected with the output of filtering circuit input converts the midfrequent AC square wave to, and the input of high-power medium-frequency transformer is electrically connected with the output of power bridge inverter main circuit boosts the isolation of midfrequent AC square wave again; The input of described full-wave voltage doubler is electrically connected the high voltage direct current that midfrequent AC square wave after will isolating converts low-ripple coefficient to the output of high-power medium-frequency transformer.
Preferably, described full-wave voltage doubler links to each other with high-tension measurement resistance; Described high-tension measurement resistance links to each other with metering circuit; Described metering circuit links to each other with the single-chip microcomputer treatment circuit; Described single-chip microcomputer treatment circuit links to each other with display; Described high pressure pressure measurement resistance links to each other with the high pressure feedback; Described Control of Voltage benchmark is in parallel with the high pressure feedback; Described Control of Voltage benchmark links to each other with comparator circuit; Described comparator circuit links to each other with PWM modulation control; Described PWM modulation control links to each other with the voltage-regulation voltage-stabilization circuit.
Because the utilization of technique scheme, the utility model compared with prior art has following advantage:
Water-cooled generator DC high potential test integration unit of the present utility model, it is simple to have a wiring, the digital recording compensation that polarizes; Automatically write down each point high tension voltage, high pressure total current, leakage current; Sampled leakage current data mean value prevents to misread advantages such as peak current.
Description of drawings
Below in conjunction with accompanying drawing technical solutions of the utility model are described further:
Accompanying drawing 2 is that the utility model water-cooled generator DC high potential test integration unit is measured the loop synoptic diagram;
Wherein: 1, buffer starting; 2, current rectifying and wave filtering circuit; 3, voltage-regulation voltage-stabilization circuit; 4, filtering circuit; 5, power bridge inverter main circuit; 6, high-power medium-frequency transformer; 7, full-wave voltage doubler; 71, high-tension measurement resistance; 711, metering circuit; 712, single-chip microcomputer treatment circuit; 714, display; 72, high pressure feedback; 70, Control of Voltage benchmark; 73, comparator circuit; 31, PWM modulation control.
Embodiment
Below in conjunction with accompanying drawing the utility model is described.
Be a kind of water-cooled generator DC high potential test integration unit described in the utility model as shown in Figure 1, comprise slow-start circuit 1, current rectifying and wave filtering circuit 2, voltage-regulation voltage-stabilization circuit 3, filtering circuit 4, power bridge inverter main circuit 5, high-power medium-frequency transformer 6, full-wave direct current voltage doubling rectifing circuit 7.The input power supply charges to the percussive action of input power supply for reducing filtering through slow-start circuit 1, described current rectifying and wave filtering circuit 2 is connected the alternating current that slow-start is sent here with the output terminal of slow-start circuit 1 and is converted to direct current, described voltage-regulation voltage-stabilization circuit 3 is connected with the output of current rectifying and wave filtering circuit 2 and converts direct current to adjustable direct current high frequency modulated ripple, 3 outputs of described filtering circuit 4 and voltage-regulation voltage-stabilization circuit are connected and convert adjustable direct current modulating wave to direct current, the direct current that the input of power bridge inverter main circuit 5 is electrically connected with the output of filtering circuit 4 input converts the midfrequent AC square wave to, the input of high-power medium-frequency transformer 6 is electrically connected with the output of power bridge inverter main circuit 5 boosts the isolation of midfrequent AC square wave again, the input of full-wave direct current voltage doubling rectifing circuit 7 is electrically connected the high voltage direct current that midfrequent AC square wave after will isolating converts low-ripple coefficient to the output of high-power medium-frequency transformer 6, described full-wave voltage doubler 7 links to each other with high-tension measurement resistance 71; Described high-tension measurement resistance 71 links to each other with metering circuit 711; Described metering circuit 711 links to each other with single-chip microcomputer treatment circuit 712; Described single-chip microcomputer treatment circuit 712 links to each other with display 714; Described high pressure pressure measurement resistance 71 links to each other with high pressure feedback 72; It is 72 in parallel that described Control of Voltage benchmark 70 and high pressure feed back; Described Control of Voltage benchmark 70 links to each other with comparator circuit 73; Described comparator circuit 73 links to each other with PWM modulation control 31; Described PWM modulation control 31 links to each other with voltage-regulation voltage-stabilization circuit 3.
Present embodiment convert industrial frequency AC to direct current, convert midfrequent AC to by direct current again, convert high voltage direct current to by midfrequent AC again, the way of this raising supply frequency mainly is for the portability that improves equipment and reduces to export the ripple factor of high pressure.
As accompanying drawing 2, the dual-loop current that the utility model adopts detects, claim lv shielded method again, big current return is connected to voltage doubling rectifing circuit, again through current-limiting resistance through the A of the output winding of high-power medium-frequency transformer end, stator winding to generator, walk the inboard water of stator to collection pipe, the X that is back to I.F.T. through the milliampere reometer again holds, and forms a big current detection circuit; The leakage current loop is through the A of the output winding of high-power medium-frequency transformer end, be connected to voltage doubling rectifing circuit, again through current-limiting resistance, stator winding to generator, walk the inboard water of stator to collection pipe resistance to earth and be electrically connected the earth, be back to the X end of I.F.T. again by big ground warp leakage current table, form a leakage current and detect the loop, general leakage current has the polarization current stack, the utility model adopts the microcomputer shielding to count, in addition polarization current shielding embodies real generator leakage current like this on the leakage current table, polarization current can fluctuate with the current variation sometimes, be the effectively fluctuation of the wave zone incoming current table of screening electrode galvanic current, after leakage current adopts microcomputer record multiple spot, again by microcomputer average after, write down last numerical value.I0 is the total output current of multiplication of voltage tube in the accompanying drawing 2, and outside stray current of I1 and test product electric current sum are that cabinet shows electric current.
The present embodiment dual-loop current is measured, and is unaffected mutually, adopted microcomputer screening electrode galvanic current method again, reaches the reading fluctuation that the fluctuation of microcomputer screening electrode galvanic current brings, and can reflect the leakage current of more real water-cooled generator stator; Described current detection circuit adopts two different loops, adopt total current and leakage current separately to measure, this type of measurement can separating big electric current and little electric current success, two electric currents all can be guaranteed precision, after leakage current adopts the MICROCOMPUTER PROCESSING multimetering, on average guarantee not misread peak current again, and each data of each point adopt the microcomputer reading more, and print and preserve data so that long-time accurately retention data.
Be suitable for the collection pipe motor of weak insulation over the ground, its wiring as shown in Figure 2.Collection pipe is connected to the tail end of high-power medium-frequency transformer high-pressure side winding through the total current milliammeter, leak the tail end of microampere meter serial connection high-pressure side winding and ground connection, so just, the electric current and the pressurization of water pipe of will flowing through relatively reaches other two-phase insulation earial drainage separately, the same state that can judge stator insulation from the earial drainage value with air cooling or hydrogen time motor.
During with the lv shielded method wiring, because microampere meter 2 and collection pipe 3 earth resistance R3 are associated, reading I ' X reality is less than Ix on the microampere meter, so obtain the numerical value of earial drainage Ix exactly, need be tried to achieve after the following formula conversion
RA in the formula---microampere meter internal resistance;
R3---collection pipe insulation against ground resistance.
R3 can after test connection is finished, measure with multimeter under the water flowing situation, and its mean value is once got in each survey of positive and negative polarity.During measurement
Water-cooled generator water flowing DC high potential test device is exactly the instrumentation according to the development of " lv shielded method " principle.It adopts the core technology of high power DC high pressure generator to substitute a series of composite test instruments such as original testing transformer, high voltage silicon rectifier stack, electric capacity of voltage regulation, commutation capacitor and inductance, electrostatic voltmeter, pressure regulator.And mA show, μ A table and polarization potential compensation system all be integrated in the control box.Have electronic tuning and multiple protection functions simultaneously.Thereby greatly alleviated the weight of testing equipment, simplified wiring, made easy, the safety of test.
Because the utilization of technique scheme, the utility model compared with prior art has following advantage:
Water-cooled generator DC high potential test integration unit of the present utility model, it is simple to have a wiring, the digital recording compensation that polarizes; Automatically write down each point high tension voltage, high pressure total current, leakage current; Sampled leakage current data mean value prevents to misread advantages such as peak current.
Below only be concrete exemplary applications of the present utility model, protection domain of the present utility model is not constituted any limitation.All employing equivalents or equivalence are replaced and the technical scheme of formation, or any to move mode dull and stereotyped described in the utility model, all drop within the utility model rights protection scope.
Claims (2)
1. a water-cooled generator DC high potential test integration unit is characterized in that: comprise slow-start circuit (1), current rectifying and wave filtering circuit (2), voltage-regulation voltage-stabilization circuit (3), filtering circuit (4), power bridge inverter main circuit (5), high-power medium-frequency transformer (6), full-wave voltage doubler (7); The input power supply charges to the percussive action of input power supply for reducing filtering through slow-start circuit (1), described current rectifying and wave filtering circuit (2) is connected the alternating current that slow-start is sent here with the output terminal of slow-start circuit (1) and is converted to direct current, described voltage-regulation voltage-stabilization circuit (3) is connected with the output of current rectifying and wave filtering circuit (2) and converts direct current to adjustable direct current high frequency modulated ripple, the output of described filtering circuit (4) and voltage-regulation voltage-stabilization circuit (3) is connected and converts adjustable direct current modulating wave to direct current, the direct current that the input of described power bridge inverter main circuit (5) is electrically connected with the output of filtering circuit (4) input converts the midfrequent AC square wave to, and the input of high-power medium-frequency transformer (6) is electrically connected with the output of power bridge inverter main circuit (5) boosts the isolation of midfrequent AC square wave again; The input of described full-wave voltage doubler (7) is electrically connected the high voltage direct current that midfrequent AC square wave after will isolating converts low-ripple coefficient to the output of high-power medium-frequency transformer (6).
2. water-cooled generator DC high potential test integration unit according to claim 1 is characterized in that: described full-wave voltage doubler (7) links to each other with high-tension measurement resistance (71); Described high-tension measurement resistance (71) links to each other with metering circuit (711); Described metering circuit (711) links to each other with single-chip microcomputer treatment circuit (712); Described single-chip microcomputer treatment circuit (712) links to each other with display (714); Described high pressure pressure measurement resistance (71) links to each other with high pressure feedback (72); Described Control of Voltage benchmark (70) is in parallel with high pressure feedback (72); Described Control of Voltage benchmark (70) links to each other with comparator circuit (73); Described comparator circuit (73) links to each other with PWM modulation control (31); Described PWM modulation control (31) links to each other with voltage-regulation voltage-stabilization circuit (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206852712U CN202041624U (en) | 2010-12-28 | 2010-12-28 | Direct-current high-voltage test integrated device for internal water cooling generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206852712U CN202041624U (en) | 2010-12-28 | 2010-12-28 | Direct-current high-voltage test integrated device for internal water cooling generator |
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| CN202041624U true CN202041624U (en) | 2011-11-16 |
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| CN2010206852712U Expired - Fee Related CN202041624U (en) | 2010-12-28 | 2010-12-28 | Direct-current high-voltage test integrated device for internal water cooling generator |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102540035A (en) * | 2010-12-28 | 2012-07-04 | 苏州华电电气股份有限公司 | Comprehensive direct-current high-voltage test device for internal water cooling generator |
| CN103743954A (en) * | 2013-12-27 | 2014-04-23 | 北京天诚同创电气有限公司 | Insulation performance detecting device |
| CN105190333A (en) * | 2013-03-15 | 2015-12-23 | 豪倍公司 | DC high potential insulation breakdown test system and method |
| CN106094952A (en) * | 2016-07-25 | 2016-11-09 | 成都翰道科技有限公司 | A kind of automatic AC regulated power supply based on voltage detecting circuit |
| CN108169702A (en) * | 2018-03-07 | 2018-06-15 | 国网浙江省电力有限公司电力科学研究院 | Water-cooled generator special isolation ohmmeter detecting platform and calibration method |
| CN113030795A (en) * | 2021-03-15 | 2021-06-25 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Pre-detection device and method before insulation test of stator winding of internal water-cooled generator |
-
2010
- 2010-12-28 CN CN2010206852712U patent/CN202041624U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102540035A (en) * | 2010-12-28 | 2012-07-04 | 苏州华电电气股份有限公司 | Comprehensive direct-current high-voltage test device for internal water cooling generator |
| CN102540035B (en) * | 2010-12-28 | 2013-07-31 | 苏州华电电气股份有限公司 | Comprehensive direct-current high-voltage test device for internal water cooling generator |
| CN105190333A (en) * | 2013-03-15 | 2015-12-23 | 豪倍公司 | DC high potential insulation breakdown test system and method |
| CN105190333B (en) * | 2013-03-15 | 2020-02-28 | 豪倍公司 | DC high potential insulation breakdown test system and method |
| CN103743954A (en) * | 2013-12-27 | 2014-04-23 | 北京天诚同创电气有限公司 | Insulation performance detecting device |
| CN106094952A (en) * | 2016-07-25 | 2016-11-09 | 成都翰道科技有限公司 | A kind of automatic AC regulated power supply based on voltage detecting circuit |
| CN108169702A (en) * | 2018-03-07 | 2018-06-15 | 国网浙江省电力有限公司电力科学研究院 | Water-cooled generator special isolation ohmmeter detecting platform and calibration method |
| CN108169702B (en) * | 2018-03-07 | 2024-02-13 | 国网浙江省电力有限公司电力科学研究院 | Special insulating resistance meter verification platform and method for water-cooled generator |
| CN113030795A (en) * | 2021-03-15 | 2021-06-25 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Pre-detection device and method before insulation test of stator winding of internal water-cooled generator |
| CN113030795B (en) * | 2021-03-15 | 2023-04-14 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Pre-detection device and method before insulation test of stator winding of internal water-cooled generator |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111116 Termination date: 20131228 |