CN203732580U - High-voltage series resonance device - Google Patents
High-voltage series resonance device Download PDFInfo
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- CN203732580U CN203732580U CN201420123890.0U CN201420123890U CN203732580U CN 203732580 U CN203732580 U CN 203732580U CN 201420123890 U CN201420123890 U CN 201420123890U CN 203732580 U CN203732580 U CN 203732580U
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- voltage
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- resonance reactor
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- 238000012360 testing method Methods 0.000 claims abstract description 65
- 238000009434 installation Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000010616 electrical installation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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- Testing Relating To Insulation (AREA)
Abstract
A high-voltage series resonance device comprises a variable-frequency power cabinet, a testing transformer, a resonance reactor and a testing voltage measuring device with a current sensor. The current sensor is connected in series between a high-voltage terminal tail of the testing transformer and a ground terminal of a capacitive test object. The section number of the resonance reactor is fixed, and the resonance reactor is installed at a permanent position. Thus, inductance value of the resonance reactor remains unchanged. By the device, frequency of conversion output voltage is adjusted. Then, voltage value across the resonance reactor is equal to voltage value across the test object when a series resonance circuit is in a complete resonance state, and testing voltage of the monitored test object is determined after Fourier transform. There is no need to configure a special attenuator used for measuring testing voltage. Thus, a withstand voltage test is efficiently, safely and conveniently finished; it can be ensured that testing voltage precision is within a permissible range; and safety and work efficiency of a series resonance AC voltage withstand test are greatly promoted.
Description
Technical field
The utility model relates to insulation of electrical installation detection technique field, is a kind of high-pressure series resonance device that safety measures of realizing specifically.
Background technology
In existing series resonance AC voltage withstand test, all adopt directly to connect capacitive divider at high-pressure side and measure trial voltage value, this method is directly monitored the voltage of measured point, and measuring process is directly perceived, result is accurate.But in application, because trial voltage value is often very high, reach hundreds of even thousands of kilovolts at the scene, very high to the requirement of insulation; And voltage divider profile is generally comparatively elongated, the more difficult control of Electric Field Distribution, often needs to add and joins large-scale grading ring; Voltage divider does not allow to keep flat, and after assembling, is vertically all " tall and thin " type, and center of gravity easily departs from, and need install longer lower margin additional, takes up an area greatly, requirement is put in scene high yet; Often need when voltage levels withstand voltage test in addition the series connection of more piece voltage divider to use, on-site hoisting, combination, after test, dismantlement work amount is large, efficiency is very low, can not meet the demand of the on-the-spot special test of the numerous high-tension switch gears of ultra-high voltage converter station, be badly in need of a kind of novel metering system and replace traditional voltage divider to measure.
Variable-frequency series-resonance device band constant reactance device, frequency of operation is generally 30～300Hz.The on-the-spot industrial frequency AC voltage divider generally using is all calibrated under 50Hz power-frequency voltage, does not also think over the frequency characteristic of 30～300Hz when design, while therefore measuring series resonance test voltage with existing voltage divider, causes actual capabilities to have larger error.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of safety, accurate high-pressure series resonance device measuring realized.
Described high-pressure series resonance device, comprise variable-frequency power sources cabinet, testing transformer, resonance reactor, the voltage output end of described variable-frequency power sources cabinet is connected to the low pressure end of described testing transformer, the high-pressure side of testing transformer connects the series loop of described resonance reactor and capacitive character test product, one end ground connection of capacitive character test product, is characterized in that:
Also comprise the test voltage measurer with current sensor, described current sensor is serially connected with between testing transformer high-pressure side afterbody and the earth terminal of capacitive character test product;
Described resonance reactor is fixed joint number, and fixed position installation, so that the inductance value of resonance reactor remains unchanged.
A kind of embodiment, described resonance reactor is fixedly mounted on test platform car.
Ultimate principle is when series resonant tank is during in complete resonant condition, capacitive character test product both end voltage equals resonance reactor magnitude of voltage, and resonance reactor magnitude of voltage=resonance reactance value × resonant tank current value, at known resonance reactance value, and measure loop current value, can be regarded as to obtain trial voltage value.
Because needing more piece connection in series-parallel conventionally, resonance reactor in high pressure withstand voltage test uses, reactor after assembling can not keep firm state, its inductance and mutual inductance value are unfixing yet, and only have these three factors of inductance value, test frequency and loop current of resonance reactor all in controlled range, just can guarantee validity and the accuracy of measuring method, this becomes traditional long-term continuity of voltage divider dividing potential drop measurement and is difficult to be broken through.The application's utility model people in the test of high-tension apparatus and installation practice through test unit having been re-started to the exploitation of system, carry out scene install and performance history in, abandon traditional dividing potential drop metering system in parallel, utilize the test platform car of controlled variable-frequency power sources cabinet and fixed installation resonance reactor, realized the accurate measurement that stable series connection is measured.And be specifically designed to the voltage divider of measuring trial voltage without configuration, complete efficiently, safely, easily withstand voltage test thereby realize, and can guarantee that trial voltage precision is in allowed band.Security and the work efficiency of series resonance AC voltage withstand test are significantly promoted.
Brief description of the drawings
Fig. 1 is the utility model circuit connection structure schematic diagram,
Fig. 2 is the equivalent circuit diagram of series resonant tank.
In figure: 1-variable-frequency power sources cabinet, 2-testing transformer, 3-resonance reactor, 4-capacitive character test product, 5-test voltage measurer.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further illustrated: as shown in Figure 1, described high-pressure series resonance device, comprise variable-frequency power sources cabinet 1, testing transformer 2, resonance reactor 3 and with the test voltage measurer 5 of current sensor, described current sensor is serially connected with between testing transformer 2 high-pressure side afterbodys and the earth terminal of capacitive character test product 4, the voltage output end of described variable-frequency power sources cabinet 1 is connected to the low pressure end of described testing transformer 2, the high-pressure side of testing transformer 2 connects the series loop of described resonance reactor 3 and capacitive character test product 4, one end ground connection of capacitive character test product 4.
The fixing joint number of described resonance reactor 3, and fixed position installation, so that the inductance value of resonance reactor remains unchanged.Described resonance reactor 3 is fixedly mounted on test platform car.
In Fig. 2, loop reactance value X
l=ω
l, loop capacitor value X
c=ω C, angular frequency=2 π f.
Work as X
l=X
c, test frequency
time, circuit is in resonant condition.
The voltage being added on test specimen is
In above-mentioned expression formula, L represents loop inductance value, can think the inductance value of resonance reactor, and C represents tank capacitance value, can think the capacitance of capacitive character test product, U
crepresent the voltage at capacitive character test specimen two ends, U
lthe voltage that represents resonance reactor two ends, U represents the on high-tension side terminal voltage of testing transformer, and R represents test loop impedance, and Q represents X
lthe ratio of/R, I is test loop electric current.
At known resonant frequency f and inductance value L, and measure electric current I, can be regarded as to obtain trial voltage value.
This measuring accuracy depends primarily on inductance value L, test frequency f and loop current I, only has these three factors all in controlled range, just can guarantee validity and the accuracy measured.
When series resonant equipment adopts on-fixed assembly type resonance reactor, the specified inductance difference of selected resonance reactor, joint number difference, putting position all can not cause the mutual inductance difference between reactor on an equal basis, resonance reactor group entirety induction reactance is produced to considerable influence, it is all fixing that this measuring method is applicable to resonance reactor joint number, disposing way, therefore no matter how test product, pressuring method change, and the reactance value in series resonant tank is all constant.
Adopting its variable-frequency power sources cabinet output voltage of series resonant equipment of square wave Frequency Conversion Theory is square-wave signal, on resonance reactor, voltage waveform is the waveform of power supply square wave of superposeing again, the electric current that causes flowing through resonant tank is equivalent to the sinusoidal current ripple high-frequency harmonic electric current that superposes, and the sine wave of test product both end voltage waveform to be power supply first-harmonic amplify Q after doubly, therefore in the time calculating trial voltage value, must isolate fundamental current, thereby accurately calculate real trial voltage value.
Can adopt its variable-frequency power sources cabinet output voltage of series resonant equipment of square wave Frequency Conversion Theory is square-wave signal, on resonance reactor, voltage waveform is the waveform of power supply square wave of superposeing again, the electric current that causes flowing through resonant tank is equivalent to the sinusoidal current ripple high-frequency harmonic electric current that superposes, and the sine wave of test product both end voltage waveform to be power supply first-harmonic amplify Q after doubly, therefore in the time calculating trial voltage value, necessary Eliminate highter harmonic electric current, isolate fundamental current, thereby accurately calculate real trial voltage value.
The above; it is only embodiment of the present utility model; but protection domain of the present utility model is not limited to this; any belong to those skilled in the art the utility model disclose technical scope in; the variation that can expect easily or replacement, within all should being encompassed in protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claim.
Claims (2)
1. a high-pressure series resonance device, comprise variable-frequency power sources cabinet (1), testing transformer (2), resonance reactor (3), the voltage output end of described variable-frequency power sources cabinet (1) is connected to the low pressure end of described testing transformer (2), the high-pressure side of testing transformer (2) connects the series loop of described resonance reactor (3) and capacitive character test product (4), one end ground connection of capacitive character test product (4), is characterized in that:
Also comprise the test voltage measurer (5) with current sensor, described current sensor is serially connected with between testing transformer (2) high-pressure side afterbody and the earth terminal of capacitive character test product (4);
Described resonance reactor (3) is fixed joint number, and fixed position installation, so that the inductance value of resonance reactor remains unchanged.
2. high-pressure series resonance device according to claim 1, is characterized in that: described resonance reactor (3) is fixedly mounted on test platform car.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420123890.0U CN203732580U (en) | 2014-03-19 | 2014-03-19 | High-voltage series resonance device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420123890.0U CN203732580U (en) | 2014-03-19 | 2014-03-19 | High-voltage series resonance device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203732580U true CN203732580U (en) | 2014-07-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420123890.0U Expired - Lifetime CN203732580U (en) | 2014-03-19 | 2014-03-19 | High-voltage series resonance device |
Country Status (1)
| Country | Link |
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| CN (1) | CN203732580U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103869113A (en) * | 2014-03-19 | 2014-06-18 | 国家电网公司 | High-voltage series resonance device and voltage withstanding test method using same |
| CN105044574A (en) * | 2015-07-24 | 2015-11-11 | 王礼卿 | Power frequency magnetron series resonant high voltage test device and high voltage test method |
-
2014
- 2014-03-19 CN CN201420123890.0U patent/CN203732580U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103869113A (en) * | 2014-03-19 | 2014-06-18 | 国家电网公司 | High-voltage series resonance device and voltage withstanding test method using same |
| CN105044574A (en) * | 2015-07-24 | 2015-11-11 | 王礼卿 | Power frequency magnetron series resonant high voltage test device and high voltage test method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140723 |