CN201562032U - Special direct current high-voltage generator for large-capacitance test specimen test - Google Patents
Special direct current high-voltage generator for large-capacitance test specimen test Download PDFInfo
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- CN201562032U CN201562032U CN2009202643984U CN200920264398U CN201562032U CN 201562032 U CN201562032 U CN 201562032U CN 2009202643984 U CN2009202643984 U CN 2009202643984U CN 200920264398 U CN200920264398 U CN 200920264398U CN 201562032 U CN201562032 U CN 201562032U
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Abstract
The utility model discloses a special direct current high-voltage generator for large-capacitance test specimen tests, which comprises a potential device giving module, a PWM pulse width modulation module, a voltage doubling module and a high-voltage output module which are sequentially and electrically connected, wherein a high-voltage feedback module is electrically connected between the PWM pulse width modulation module and the high-voltage output module, the special direct current high-voltage generator also comprises a CPU detection module, a D/A giving module and a high-voltage current measuring module, the CPU detection module is used for detecting the potential regulation magnitude and the high-voltage current intensity of the potential device giving module, the CPU detection module and the D/A giving module are electrically connected in series between the potential device giving module and the PWM pulse width modulation module, the output of the D/A given module is electrically connected to the PWM pulse width modulation module, one end of the high-voltage current measuring module is electrically connected with the CPU detection module, and the other end is electrically connected to the high-voltage output module. The direct current high-voltage generator ensures that the large-capacitance test specimens can not generate the phenomenon of tripping operation caused by high-voltage overcurrent because of no occurrence of charging overcurrent under the condition of not influencing other performance of the equipment, so the test can be normally and smoothly carried out.
Description
Technical field
The utility model relates to the high voltage direct current generator technical field, especially a kind of high voltage direct current generator that is exclusively used in big electric capacity test product test.
Background technology
Conventional 800KV/10mA high voltage direct current generator can repeatedly be applied to little electric capacity test product DC voltage withstand tests such as change of current change; capacity; technical indicator such as voltage and continuous operating time can both satisfy the DC break down voltage requirement of extra large cable; but for the big capicitive sample more than the 2uF; in the process of boosting; be very easy to cause high-pressure and overflowing trip (this is the prerequisite safeguard measure of high voltage direct current generator) owing to charging current is excessive; test just can't normally go on like this; manually control is difficult to avoid the generation of this situation; because reometer show time-delay; seeing may be day after the fair when electric current increases, and therefore needs further to study and improve the method for controlling of high voltage direct current generator.
Present high voltage direct current generator principle of work is boosted and is adopted the potentiometer voltage regulating mode as shown in Figure 1, and the speed of regulator potentiometer is by people's hand control, the position of potentiometer directly determines pulsewidth, also just determine output voltage, that is to say same speed regulator potentiometer, the speed of boosting
Be certain, charging current
For little electric capacity test product, C is very little, and I is also just little, electric current depends on the insulation resistance of test product substantially, and characteristic approaches resistive load, but big electric capacity test product, C is very big, I is just very big, and maximum charging current may surpass the limit of instrument output current, yet, the reason of protecting when all high voltage direct current generators discharge based on test product in process of the test, all be provided with the instantaneous overcurrent protection, therefore, be easy to trip because of charging current is excessive; Conventional high voltage direct current generator boost output voltage current characteristics such as Fig. 2 of process, as can be seen from Figure 2, the given rate of pressure rise one of the idiostatic device of high tension voltage of output regularly, output voltage when load is resistive load, the given rate of pressure rise unanimity of the idiostatic substantially device of electric current, when load is large capacitive load, high-tension current is in the charging high-tension current maximum of moment, and with the velocity correlation of regulating, certainly also relevant with the timeconstant of charge circuit, what Fig. 2 represented is that resistance in series R is 500K Ω, capacitive load is 2uF, and timeconstant is the output voltage of 1 second the conventional high voltage direct current generator of the process of boosting, current characteristics.
Summary of the invention
The purpose of this utility model is to overcome the prior art high voltage direct current generator and causes high-pressure and overflowing tripping operation to occur, cause testing the technical matters that can't carry out easily because of charging current is excessive when being used for the test of big electric capacity test product, and a kind of high voltage direct current generator that can prevent effectively when being used for big electric capacity test product test that charging current is excessive and trip is provided.
For realizing above purpose, the utility model has been taked following technical scheme: a kind of high voltage direct current generator that is exclusively used in big electric capacity test product test, include the given module of potentiometer that is electrically connected successively, the PWM pulse width modulation module, the multiplication of voltage module, high voltage output module, between described PWM pulse width modulation module and high voltage output module, be electrically connected with the high pressure feedback module, also include the CPU detection module that is used to detect potentiometer given module current potential adjusting size and high-tension current size, the given module of D/A, the high-voltage current measurement module, described CPU detection module and the given module of D/A are electrically connected in series between given module of described potentiometer and PWM pulse width modulation module, the given module output of described D/A is electrically connected to the PWM pulse width modulation module, described high-voltage current measurement module one end is electrically connected with the CPU detection module, and the other end is electrically connected to described high voltage output module.
Conventional high voltage direct current generator is easy to trip because of high-pressure and overflowing to large capacitive load in the process of boosting, find but further analyze, voltage was also rising when big capicitive sample boosted process generation overcurrent, and voltage is descending during test product disruptive discharge overcurrent, both have obvious difference, therefore, as long as in the overcurrent protection of equipment, increase voltage criterion, just can distinguish capicitive sample charging overcurrent or test product discharge overcurrent, if test product discharge overcurrent is promptly protected tripping operation, the rate of pressure rise if capicitive sample charging overcurrent promptly takes measures to reduce; Therefore by increasing the given module way of output of D/A that one-level adopts the CPU detection module, at first measure the adjusting size of potentiometer, the CPU detection module detects the signal of the given module of potentiometer then, according to its amplitude of accommodation size, the given back that reduces is by the given module output of D/A in the unit interval, the high-voltage current measurement module is measured the high-tension current size of high voltage output module output, and testing result sent to the CPU detection module, after the CPU detection module receives this high-tension current signal, if immediate current still is bigger than normal, then the high pressure rated current that the instantaneous pressure electric current is no more than high voltage direct current generator is controlled all the time by the given module output of D/A in the given back that reduces in the unit interval.
The utility model compared with prior art, have following advantage: high voltage direct current generator of the present utility model can guarantee big electric capacity test product is not charged that overcurrent causes high-pressure and overflowing and the phenomenon that trips makes test normally to carry out smoothly under the condition that does not influence other performances of equipment.
Description of drawings
Fig. 1 is a prior art high voltage direct current generator control principle synoptic diagram;
Fig. 2 is prior art high voltage direct current generator boost output voltage, the current characteristics synoptic diagram of process;
Fig. 3 is the utility model high voltage direct current generator control principle synoptic diagram;
Fig. 4 is the utility model high voltage direct current generator boost output voltage, the current characteristics synoptic diagram of process;
Fig. 5 is the utility model embodiment sea cable DC voltage withstand test wiring diagram relatively;
Fig. 6 is the trial voltage pressurization program synoptic diagram of Fig. 5.
Embodiment
Below in conjunction with the drawings and specific embodiments content of the present utility model is described in further details.
Embodiment one:
See also shown in Figure 3, a kind of high voltage direct current generator that is exclusively used in big electric capacity test product test, include the given module of potentiometer that is electrically connected successively, the PWM pulse width modulation module, the multiplication of voltage module, high voltage output module, between described PWM pulse width modulation module and high voltage output module, be electrically connected with the high pressure feedback module, also include the CPU detection module that is used to detect potentiometer given module current potential adjusting size and high-tension current size, the given module of D/A, the high-voltage current measurement module, described CPU detection module and the given module of D/A are electrically connected in series between given module of described potentiometer and PWM pulse width modulation module, the given module output of described D/A is electrically connected to the PWM pulse width modulation module, described high-voltage current measurement module one end is electrically connected with the CPU detection module, and the other end is electrically connected to described high voltage output module.
Revise after the steering logic, high voltage direct current generator at the voltage of process output that boosts, current characteristics as by shown in Figure 4, as can be seen from Figure 4, with the described same load of Fig. 2 under, potentiometer output is same with the original rate of rise, but the speed of high pressure output is slack-off, and output becomes more level and smooth, and the high pressure output current has obtained effective control.
Present embodiment is to wherein 1 maintenance routine techniques of the 200KV/20mA high voltage direct current generator of 2 same models; in addition 1 is improved by the utility model structure; it is shown in Figure 3 to be that control structure changes into; and overcurrent protection increases voltage criterion; with them the electric capacity test product of 2uF and 8uF is carried out 3 kinds of tests respectively; all test the charging resistor (water resistance) of the 500K Ω that all connects, and test findings is respectively shown in table 1, table 2, table 3.
What table 1 write down is the data result that overcurrent tripping does not take place with improving the front and back high voltage direct current generator that 2uF electric capacity test product is tested respectively, can find out that from table 1 the high voltage direct current generator output moment maximum high-voltage electric current after improving under the same potentiometer regulations speed is obviously reduced.
Table 1: high voltage direct current generator is to 2uF test product process testing one of the contrast table as a result that boosts before and after improving
Table 2 record be that the front and back high voltage direct current generator is tested 2uF electric capacity test product and the regulations speed that continues to increase potentiometer makes the data result that does not improve the high voltage direct current generator overcurrent tripping with improving respectively, from table 2, can find out, after increasing the potentiometer regulations speed, the confined effect of high voltage direct current generator output moment maximum high-voltage electric current of improving back (being the utility model) is more obvious, for the given speed 4 of potentiometer, high voltage direct current generator before improving trips because of charging current is excessive, but the high voltage direct current generator output current after improving has only about half of ultimate value, and test findings shows that the high voltage direct current generator after the improvement can prevent the big electric capacity test product process generation overcurrent tripping that boosts really.
Table 2: before and after improving high voltage direct current generator to the 2uF test product boost process testing as a result contrast table two
That table 3 writes down is the result who with high voltage direct current generator before and after improving 8uF electric capacity test product is tested respectively, the extra large cable ground capacitance of Hainan networking project is about 7.368uF, select 8uF electric capacity test product to test to be in order to simulate the process of boosting whether high voltage direct current generator after the improvement satisfies extra large cable withstand voltage test, but because the restriction that test product bears voltage can only be simulated 20kV.From table 3, can find out, under same potentiometer regulations speed, the confined effect of high voltage direct current generator output moment maximum high-voltage electric current electric current after the improvement is obvious, for the given speed 6 of potentiometer, high voltage direct current generator before improving trips because of charging current is excessive, but the high voltage direct current generator output current after improving is limited very rationally, and test findings shows that the high voltage direct current generator after the improvement can prevent really as the big electric capacity test product of this class of the extra large cable process generation overcurrent tripping that boosts.
Before and after table 3. improves high voltage direct current generator to the 8uF test product boost process testing as a result contrast table three
At last; with the high voltage direct current generator that improves the back and keep intact the 2uF test product is boosted to 5kV respectively; after treating that voltage is stablized 5 minutes; use 10K Ω resistance with the test product short circuit respectively; the discharge of simulation test product; the protection tripping operation all takes place in 2 high voltage direct current generators as a result, and the high voltage direct current generator after evidence improves possesses test product discharge prevention function equally.
Embodiment two:
Present embodiment provides the practical application example of a high voltage direct current generator, to further specify the application of high voltage direct current generator of the present utility model.
Project team is based on above result of study, 1 800KV/10mA high voltage direct current generator and 2 1200KV/10mA high voltage direct current generators on the basis of conventional high voltage direct current generator, have been developed, 1 1200KV/10mA high voltage direct current generator is wherein used 30.7 kilometers extra large cable-775KV/15 minute DC voltage withstand test, process of the test is very well, the test connection schematic diagram as shown in Figure 5, the pressurization program as shown in Figure 6, test findings such as table 4, reality proves that fully this high voltage direct current generator is highly suitable for the DC voltage withstand test of big electric capacity test product.
Table 4 test figure table
| Sequence number | Parameter | The mutually extra large cable of A | The mutually extra large cable of B | The mutually extra large cable of C |
| 1 | Sea cable length (km) | 30.7 | 30.7 | 30.7 |
| 2 | The total capacitance value over the ground (uf) of whole extra large cable | 7.36800 | 7.36800 | 7.36800 |
| Sequence number | Parameter | The mutually extra large cable of A | The mutually extra large cable of B | The mutually extra large cable of C |
| 3 | The insulation against ground resistance value of whole extra large cable (M Ω) | 1716.66667 | 1716.66667 | 1716.66667 |
| 4 | Charging rate (s) | 29.47200 | 29.47200 | 29.47200 |
| 5 | Nature discharge time constant (h) | 1.11686 | 1.11686 | 1.11686 |
| 6 | The 1st section terminal point (kV) that boosts | 300.00000 | 300.00000 | 300.00000 |
| 7 | The 1st section mean charging current (mA) | 5.00000 | 5.00000 | 5.00000 |
| 8 | The 1st section t1 pressure rising time (min) | 7.36800 | 7.36800 | 7.36800 |
| 9 | The 1st section residence time t2 (s) | 60.00000 | 60.00000 | 60.00000 |
| 10 | The 1st section stops initial current (mA) | 5.00000 | 5.00000 | 5.00000 |
| 11 | The 1st section stops termination electric current (mA) | 0.82762 | 0.82762 | 0.82762 |
| 12 | The 2nd section terminal point (kV) that boosts | 450.00000 | 450.00000 | 450.00000 |
| 13 | The 2nd section mean charging current (mA) | 5.00000 | 5.00000 | 5.00000 |
| 14 | The 2nd section t3 pressure rising time (min) | 3.68400 | 3.68400 | 3.68400 |
| 15 | The 2nd section residence time t4 (s) | 60.00000 | 60.00000 | 60.00000 |
| 16 | The 1st section stops initial current (mA) | 5.00000 | 5.00000 | 5.00000 |
| 17 | T stops for the 2nd section and stops electric current (mA) | 0.91500 | 0.91500 | 0.91500 |
| 18 | The 3rd section terminal point (kV) that boosts | 600.00000 | 600.00000 | 600.00000 |
| 19 | The 3rd section mean charging current (mA) | 3.00000 | 3.00000 | 3.00000 |
| 20 | The 3rd section t5 pressure rising time (min) | 6.14000 | 6.14000 | 6.14000 |
| 21 | The 3rd section residence time t6 (s) | 40.00000 | 40.00000 | 40.00000 |
| 22 | The 1st section stops initial current (mA) | 3.00000 | 3.00000 | 3.00000 |
| 23 | The 3rd section stops termination electric current (mA) | 1.12164 | 1.12164 | 1.12164 |
| 24 | The 4th section terminal point (kV) that boosts | 700.00000 | 700.00000 | 700.00000 |
| Sequence number | Parameter | The mutually extra large cable of A | The mutually extra large cable of B | The mutually extra large cable of C |
| 25 | The 4th section mean charging current (mA) | 3.00000 | 3.00000 | 3.00000 |
| 26 | The 4th section t7 pressure rising time (min) | 4.09333 | 4.09333 | 4.09333 |
| 27 | The 4th section residence time t8 (s) | 30.00000 | 30.00000 | 30.00000 |
| 28 | The 1st section stops initial current (mA) | 3.00000 | 3.00000 | 3.00000 |
| 29 | The 4th section stops termination electric current (mA) | 1.49181 | 1.49181 | 1.49181 |
| 30 | The 5th section terminal point (kV) that boosts | 775.00000 | 775.00000 | 775.00000 |
| 31 | The 5th section mean charging current (mA) | 2.00000 | 2.00000 | 2.00000 |
| 32 | The 5th section t9 pressure rising time (min) | 4.60500 | 4.60500 | 4.60500 |
| 33 | The 5th section residence time t10 (s) | 900.00000 | 900.00000 | 900.00000 |
| 34 | The 1st section stops initial current (mA) | 2.00000 | 2.00000 | 2.00000 |
| 35 | The 4th section stops termination electric current (mA) | 0.45146 | 0.45146 | 0.45146 |
| 36 | Total pressure rising time (min) | 29.05700 | 29.05700 | 29.05700 |
| 37 | Q always injects electric weight Q (c) | 5.71020 | 5.71020 | 5.71020 |
More than other of the 1200kV/10mA type high voltage direct current generator of Ying Yonging is below technical parameter:
A. output rated voltage: 0～400kV (single-unit use);
0～800kV (binodal uses, and extra large cable withstand voltage test intends using binodal);
0～1200kV (three joints use);
B. output voltage polarity: change output voltage polarity by upset multiplication of voltage tube positive-negative polarity
C. export rated current: 25mA (single-unit multiplication of voltage tube)
15mA (binodal multiplication of voltage tube, extra large cable withstand voltage test intends using binodal)
10mA (three joint multiplication of voltage tubes)
D. output power: 12kW
E. voltage measurement error: 1.0% (full scale) ± 2 word
F. current measurement errors: 1.0% (full scale) ± 2 word
G. the overvoltage error of adjusting :≤1.0%
H.0.75 switching error :≤1.0%
I. ripple coefficient :≤1.5%
J. voltage-regulation coefficient: random fluctuation, mains voltage variations ± 10% ,≤1%
K. series limiting resistor: every joint 2M Ω, totally 3 joints, (extra large cable withstand voltage test intends using binodal).
Above-listed detailed description is at the specifying of the utility model possible embodiments, and this embodiment is not in order to limiting claim of the present utility model, does not allly break away from the equivalence that the utility model does and implements or change, all should be contained in the claim of this case.
Claims (1)
1. one kind is exclusively used in the high voltage direct current generator that big electric capacity test product is tested, include the given module of potentiometer, PWM pulse width modulation module, multiplication of voltage module, the high voltage output module that are electrically connected successively, between described PWM pulse width modulation module and high voltage output module, be electrically connected with the high pressure feedback module
It is characterized in that: also include the CPU detection module that is used to detect potentiometer given module current potential adjusting size and high-tension current size, the given module of D/A, the high-voltage current measurement module, described CPU detection module and the given module of D/A are electrically connected in series between given module of described potentiometer and PWM pulse width modulation module, the given module output of described D/A is electrically connected to the PWM pulse width modulation module, described high-voltage current measurement module one end is electrically connected with the CPU detection module, and the other end is electrically connected to described high voltage output module.
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Cited By (3)
| 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 |
| CN105190333A (en) * | 2013-03-15 | 2015-12-23 | 豪倍公司 | DC high potential insulation breakdown test system and method |
| CN109839578A (en) * | 2018-05-07 | 2019-06-04 | 广东电网有限责任公司 | A kind of portable insulating rod insulation performance test instrument |
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2009
- 2009-12-09 CN CN2009202643984U patent/CN201562032U/en not_active Expired - Lifetime
Cited By (7)
| 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 |
| EP2972428A4 (en) * | 2013-03-15 | 2016-12-21 | Hubbell Inc | Dc high potential insulation breakdown test system and method |
| US10310006B2 (en) | 2013-03-15 | 2019-06-04 | Hubbell Incorporated | DC high potential insulation breakdown test system and method |
| US10634711B2 (en) | 2013-03-15 | 2020-04-28 | Hubbell Incorporated | DC high potential insulation breakdown test system and method |
| CN109839578A (en) * | 2018-05-07 | 2019-06-04 | 广东电网有限责任公司 | A kind of portable insulating rod insulation performance test instrument |
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