CN203025310U - High-voltage sleeve insulation detection device based on frequency domain dielectric spectrum - Google Patents
High-voltage sleeve insulation detection device based on frequency domain dielectric spectrum Download PDFInfo
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- CN203025310U CN203025310U CN 201220711437 CN201220711437U CN203025310U CN 203025310 U CN203025310 U CN 203025310U CN 201220711437 CN201220711437 CN 201220711437 CN 201220711437 U CN201220711437 U CN 201220711437U CN 203025310 U CN203025310 U CN 203025310U
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- 238000009413 insulation Methods 0.000 title claims abstract description 40
- 238000001514 detection method Methods 0.000 title claims abstract description 35
- 238000001453 impedance spectrum Methods 0.000 title abstract 3
- 238000012360 testing method Methods 0.000 claims abstract description 17
- 238000001566 impedance spectroscopy Methods 0.000 claims description 16
- 238000005259 measurement Methods 0.000 claims description 15
- 238000002474 experimental method Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 14
- 238000000034 method Methods 0.000 description 6
- 239000012535 impurity Substances 0.000 description 5
- 230000032683 aging Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 230000005684 electric field Effects 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
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Abstract
The utility model relates to the technical field of the insulation detection of high-voltage equipment, and specifically relates to a high-voltage sleeve insulation detection device based on a frequency domain dielectric spectrum. The high-voltage sleeve insulation detection device comprises a variable-frequency power supply, a series resonance boosting device, a standard voltage transformer, a current detection module and a measuring and control module, wherein one ends of the variable-frequency power supply, the series resonance boosting device, the standard voltage transformer band the current detection module are respectively connected with the measuring and control module, the other ends of the variable-frequency power supply, the series resonance boosting device and the standard voltage transformer are connected with a high voltage end of a detected sleeve, and the other end of the current detection module is connected with an end screen terminal of the detected sleeve. The device can detect the insulation of the sleeve based on a frequency domain dielectric spectrum test.
Description
Technical field
The utility model relates to high voltage installation insulation detection technique field, is specifically related to a kind of bushing insulation detection device based on dielectric spectroscopy, and this device adopts the insulation to sleeve pipe based on the dielectric spectroscopy test to be detected.
Background technology
Along with construction super, UHV Transmission Engineering, electric power is carried the rising of electric pressure and the increase of transmission line capability, and the requirement of power transmission and transforming equipment safe and stable operation is improved day by day.Bushing is one of most important annex of widely used support and insulating effect in power equipment, and the consequence that its mass defect or fault cause is very severe, or causes even casualties of huge economic loss.Dielectric spectroscopy (frequency domain spectroscopy, FDS) method of testing based on the dielectric response theory is widely used in the state of insulation detection of high-tension apparatus at present, for assessment of humidified insulation and the ageing state of high-tension apparatus.The measuring principle of dielectric spectroscopy is that tested device is applied to the sine voltage signal changed in the 0.001Hz-1000Hz scope of a low-voltage (generally being no more than 200V), the dielectric dissipation factor of checkout equipment under different frequency, carry out the insulation status of judgment device by the frequency characteristic of equipment dielectric loss factor.
To the sleeve pipe insulation detecting method, be according to power industry standard " DL/T 596-2005 power equipment preventive trial rules " at present, the dielectric dissipation factor (tan δ) that sleeve pipe is carried out under 50Hz power frequency 10kV voltage is measured, and with the 50Hz dielectric dissipation factor, whether is less than the aging and state that makes moist that a threshold value judges the cover pipe insulation.The utility model patent ZL03124730.X method of hidden danger " the on-line monitoring bushing shell for transformer insulation " has also proposed under on-line monitoring 50Hz the bushing shell for transformer dielectric dissipation factor and for judging the method for sleeve pipe state of insulation.Although under power frequency, dielectric dissipation factor is measured the humidified insulation can find the part sleeve pipe and aging, its quantity of information of obtaining is limited, adopts the state of insulation of the dielectric dissipation factor judgment device of single-frequency point to have certain limitation.Often can find that there is humidified insulation or the sleeve pipe in treatment of aged later stage, the dielectric dissipation factor of its power frequency 50Hz meets standard-required, but can judge and make moist by analyzing its dielectric loss frequency characteristic.In power industry, also occurred a lot of through the withstand voltage and qualified bushing shell for transformer of partial discharge test, the serious accident of blasting under normal operating condition.Therefore judge that by the sleeve pipe dielectric dissipation factor frequency characteristic of measuring under the wider frequency section state of insulation of sleeve pipe is more accurate than the judgement of the dielectric dissipation factor under single power frequency.
But there is voltage characteristic in the dielectric dissipation factor of sleeve pipe, i.e. Garton effect.The Garton effect is in containing the insulating medium of paper, and the dielectric dissipation factor under low voltage may be its under high voltage 1～10 times.Stop transport or standing time longer sleeve pipe the Garton effect easily appears because the distribution situation of its well cuts, moisture and the sleeve pipe under operating condition there is some difference.For operating sleeve pipe, due to electric field action, impurity, attachment of moisture are at capacitance plate surface, sleeve pipe insulator inwall, and the impurity phase of dielectric space is to reducing, and polarization loss is relatively little; And long-time standing sleeve pipe, its inner impurity, moisture etc. are in suspended state, and while carrying out the low-voltage Dielectric Loss Test, the interfacial polarization of ion is serious, makes the tan δ value of measurement relatively higher.So recommend to carry out the dielectric loss measurement under the sleeve pipe working voltage.Current dielectric spectroscopy testing tool, its voltage generally is no more than 200V, even if the voltage that ranges up to 2kV also much smaller than the working voltage of bushing, and the HV test equipment of 0.001Hz-1000Hz scope has larger difficulty.Therefore to measure the dielectric loss result that may cause test and sleeve pipe time of day may difference very large for the dielectric spectroscopy under low-voltage, affects the diagnosis and detection result.
In order exactly bushing to be carried out to state of insulation detection and assessment, overcome the shortcoming of dielectric loss test under single-frequency and low-voltage, be necessary that the dielectric spectroscopy of 0.001Hz-1000Hz is tested to the sleeve pipe dielectric loss frequency curve obtained to be revised and process, and avoids the impact of Garton effect.
Summary of the invention
Technical problem to be solved in the utility model is: the deficiency of the dielectric loss frequency characteristic under the sleeve pipe low-voltage of obtaining for existing dielectric spectroscopy test and traditional single power frequency dielectric loss measurement assessment sleeve pipe state of insulation, a kind of impact that can avoid sleeve pipe Garton effect is provided, than true dielectric loss frequency characteristic in Obtaining Accurate sleeve pipe 0.001Hz-1000Hz scope, thereby reach a kind of bushing insulation detection device based on dielectric spectroscopy of accurate evaluation sleeve pipe state of insulation.
For achieving the above object, the technical solution adopted in the utility model is: a kind of bushing insulation detection device based on dielectric spectroscopy, it comprises variable-frequency power sources, the series resonance increasing apparatus, standard potential transformer, current detection module, measure and control module, described variable-frequency power sources, the series resonance increasing apparatus, standard potential transformer, a current detection module end separately is connected with control module with measurement respectively, variable-frequency power sources, the series resonance increasing apparatus, an other end of standard potential transformer is connected to the high-pressure side of tested sleeve pipe, the other end of current detection module is connected to the end shield terminal of tested sleeve pipe.
By above scheme, variable-frequency power sources provides that frequency 0.001Hz-1000Hz is adjustable, the low pressure sinusoidal experiments power supply of voltage magnitude 100V, power supply capacity 10W; The series resonance increasing apparatus provides 0-500kV adjustable, the sinusoidal wave high-voltage test electric power that frequency 40Hz-300Hz is adjustable, power supply capacity 20kW; Current detecting unit measurement range 0-1A, 0.1 grade of accuracy, standard potential transformer 4 is for filling SF
6the insulation standard potential transformer, 0.1 grade of accuracy.
The beneficial effects of the utility model are: pass through the utility model, the impact of having avoided the Garton effect to measure tan δ under low-voltage, obtain the true tan δ frequency curve of sleeve pipe under 0.001Hz-1000Hz scope low-voltage and be used for judging the state of insulation of sleeve pipe, compare the tan δ judgement sleeve pipe state of insulation that tradition adopts the single 50Hz Frequency point of sleeve pipe, improved the accuracy of judgement.The realization simple in structure, easy of test of the present utility model and measurement mechanism, avoided carrying out 0.001Hz-1000Hz scope tan δ under the employing high voltage and measured the difficult problem that its test unit is difficult to realization.
The accompanying drawing explanation
The structural drawing of the bushing insulation detection device based on dielectric spectroscopy that Fig. 1 is the utility model embodiment;
The measurement procedure figure that Fig. 2 is the utility model embodiment.
In Fig. 1, the high-pressure side of 1-tested sleeve pipe, the end shield terminal of 2-tested sleeve pipe, the flange of the tested sleeve pipe of 3-, 4-standard potential transformer, 5-current detection module, the connecting line of the high-pressure side of 6-variable-frequency power sources and tested sleeve pipe, the connecting line of the high-pressure side of 7-series resonance increasing apparatus and tested sleeve pipe, 8-series resonance increasing apparatus, the 9-variable-frequency power sources, 10-measures and control module.
Embodiment
Further illustrate the utility model embodiment below in conjunction with accompanying drawing.
As shown in Figure 1, a kind of bushing insulation detection device based on dielectric spectroscopy of the utility model embodiment, it comprises variable-frequency power sources 9, series resonance increasing apparatus 8, standard potential transformer 4, current detection module 5, measure and control module 10, described variable-frequency power sources 9, series resonance increasing apparatus 8, standard potential transformer 4, current detection module 5 end separately is connected with control module 10 with measurement respectively, variable-frequency power sources 9, series resonance increasing apparatus 8, an other end of standard potential transformer 4 is connected to the high-pressure side of tested sleeve pipe, the other end of current detection module 5 is connected to the end shield terminal of tested sleeve pipe.
Concrete, variable-frequency power sources 9 provides that frequency 0.001Hz-1000Hz is adjustable, the low pressure sinusoidal experiments power supply of voltage magnitude 100V, power supply capacity 10W; Series resonance increasing apparatus 8 provides 0-500kV adjustable, the sinusoidal wave high-voltage test electric power that frequency 40Hz-300Hz is adjustable, power supply capacity 20kW; Current detecting unit 5 measurement range 0-1A, 0.1 grade of accuracy, standard potential transformer 4 is for filling SF
6the insulation standard potential transformer, 0.1 grade of accuracy.
As shown in Figure 2, a kind of bushing insulation detecting method based on dielectric spectroscopy of the utility model embodiment, it comprises the following steps:
Step 1: the high-pressure side 1 that variable-frequency power sources 9 is connected to tested sleeve pipe, disconnect the connecting line 7 of the high-pressure side 1 of series resonance increasing apparatus 8 and tested sleeve pipe, standard potential transformer 4 is connected to high-pressure side 1 detectable voltage signals of tested sleeve pipe, the end shield terminal 2 that current detection module 5 is connected to tested sleeve pipe, control variable-frequency power sources 9 output frequencies in the 0.001Hz-1000Hz scope, the voltage of amplitude 100V, phase differential by measuring voltage and current signal, thereby detect the frequency curve of the sleeve pipe dielectric dissipation factor (tan δ) of 0.001Hz-1000Hz scope 100V voltage,
Step 2: series resonance increasing apparatus 8 is connected with the high-pressure side 1 of tested sleeve pipe, disconnect the connecting line 6 of the high-pressure side 1 of variable-frequency power sources 9 and tested sleeve pipe, standard potential transformer 4 is connected to high-pressure side 1 detectable voltage signals of tested sleeve pipe, the end shield terminal 2 that current detection module 5 is connected to tested sleeve pipe, by adjusting electric voltage frequency and the amplitude of series resonance increasing apparatus 8, obtain in the 40Hz-300Hz scope and be no less than 5 Frequency points, and the voltage sleeve pipe dielectric dissipation factor tan δ that is the sleeve pipe rated voltage;
Step 3: the sleeve pipe dielectric dissipation factor tan δ of 5 Frequency points measuring under 40Hz-300Hz scope rated voltage and the sleeve pipe dielectric dissipation factor tan δ frequency curve of 0.001Hz-1000Hz scope 100V voltage are compared, if the deviation all<5% of the dielectric dissipation factor of tan δ frequency curve on same frequency point that the tan δ of 5 measurement points and 0.001Hz-1000Hz scope are measured, think that the 0.001Hz-1000Hz scope is measured under low-voltage sleeve pipe dielectric dissipation factor is not subject to the impact of Garton effect, 0.001Hz-1000Hz the tan δ value measured value of measuring under the scope low-voltage is effective, can judge by the tan δ frequency curve of this group 0.001Hz-1000Hz the state of insulation of sleeve pipe,
Step 4: if the deviation of the dielectric dissipation factor of tan δ on same frequency point that the tan δ of 5 measurement points and 0.001Hz-1000Hz scope are measured is all > 5%, think that the 0.001Hz-1000Hz scope is measured under low-voltage sleeve pipe dielectric dissipation factor has been subject to the impact of Garton effect, these group data are invalid;
Step 5: the Garton effect easily appears in the sleeve pipe longer due to standing time, and due to the impact of Garton effect, under general low-voltage, tan δ is greater than tan δ under high voltage; In the case, be continuously applied rated voltage is measured certain Frequency point tan δ after one hour to sleeve pipe by the series resonance increasing apparatus
1, then be depressured to the tan δ that 100V observes same frequency point
2value;
Step 6: due to electric field action, when sleeve pipe applies rated voltage, its inner impurity, attachment of moisture are at capacitance of bushing screen surfaces, insulator inwall, and the impurity phase of dielectric space is to reducing, and polarization loss is relatively little, can make dielectric loss reduce.If tan is δ
2with tan δ
1deviation<5%, think that sleeve pipe Garton effects is less, the test that should adopt immediately variable-frequency power sources 9 to carry out under 100V voltage, obtain the state of insulation of sleeve pipe at the tan of 0.001Hz-1000Hz scope δ frequency curve judgement sleeve pipe;
Step 7: if tan is δ
2with tan δ
1deviation 5%, think that sleeve pipe is subject to the impact of Garton effect larger, but repeating step five, until tan δ
2with tan δ
1deviation<5% after carry out step 6, obtain the state of insulation of sleeve pipe at the tan of 0.001Hz-1000Hz scope δ frequency curve judgement sleeve pipe.
Below exemplify an embodiment and further illustrate the utility model implementation step:
Variable-frequency power sources 9 is connected to the high-pressure side 1 of tested sleeve pipe, disconnect the connecting line 7 of the high-pressure side 1 of series resonance increasing apparatus 8 and tested sleeve pipe, standard potential transformer 4 is connected to high-pressure side 1 detectable voltage signals of tested sleeve pipe, end shield terminal 2 by current detection module 5 joint sleeves, by the flange of tested sleeve pipe 3 ground connection, control variable-frequency power sources 9 output frequencies in the 0.001Hz-1000Hz scope by measuring with control module 10, the voltage of amplitude 100V, measure and control module 10 connection standard voltage transformer (VT) 4 and current detection module 5, obtain respectively the voltage and current signal, thereby detect the frequency curve of the sleeve pipe dielectric dissipation factor (tan δ) of 0.001Hz-1000Hz scope 100V voltage.
By being connected of the high-pressure side 1 of series resonance increasing apparatus 8 and tested sleeve pipe, disconnect being connected of high-pressure side 1 of variable-frequency power sources 9 and tested sleeve pipe, high-pressure side 1 detectable voltage signals that standard potential transformer 4 is connected to tested sleeve pipe, end shield terminal 2 by current detection module 5 joint sleeves, casing flange 3 ground connection, measure electric voltage frequency and the amplitude of adjusting series resonance increasing apparatus 8 with control module 10, measure and control module 10 connection standard voltage transformer (VT) 4 and current detection module 5, obtain at least 5 Frequency points in the 40Hz-300Hz scope, and the sleeve pipe dielectric dissipation factor tan δ that voltage is the sleeve pipe rated voltage, as the tan δ under (B the organizes data) 45Hz under in rated voltage
45B=0.351%, tan δ under 65Hz
65B=0.352%, tan δ under 75Hz
75B=0.353%, tan δ under 105Hz
105B=0.354%, tan δ under 120Hz
120B=0.356%.
Contrast 0.001Hz-1000Hz scope, the dielectric dissipation factor of measuring under 100V voltage is respectively (A organizes data) tan δ on same frequency point
45A=0.398%, tan δ
65A=0.409%, tan δ
75A=0.415%, tan δ
105A=0.404%, tan δ
120A=0.406%, contrast two groups of data, find that the tan δ value under low-voltage is bigger than normal more than 10% than the tan δ value under rated voltage.Think that the dielectric loss measurement under low-voltage has been subject to the impact of sleeve pipe Garton effect, 0.001Hz-1000Hz the sleeve pipe tan δ data of scope 100V voltage are invalid data, if the state of insulation by this group data judgement sleeve pipe, may be evaluated as sleeve pipe in good condition the sleeve pipe in ageing state.
In the case, be continuously applied rated voltage is measured 65Hz tan δ after 1 hour to casing high pressure end 1 by series resonance increasing apparatus 8
1=0.351%, then be depressured to 100V, the tan δ of 65Hz
2=0.362%, both are less than 5% at deviation, think that the tan δ of low-voltage measurement is effective.Disconnect immediately the line 7 of series resonance increasing apparatus 8 and casing high pressure end, connect variable-frequency power sources 9 and casing high pressure end 1, carry out the sleeve pipe dielectric dissipation factor test of 0.001Hz-1000Hz scope 100V voltage, contrast identical frequency test and put its result for (C organizes data): tan δ
45C=0.361%, tan δ
65C=0.363%, tan δ
75C=0.368%, tan δ
105C=0.368%, tan δ
120C=0.370%, with the dielectric loss of (B organizes data) corresponding frequencies point of measuring under rated voltage before, compare, deviation is less than 5%, think that the sleeve pipe medium frequency curve of 0.001Hz-1000Hz scope 100V voltage of C group data is effective, can, by the state of insulation of this curve judgement sleeve pipe, finally by this curve, judge that this sleeve pipe is in good condition.
Claims (2)
1. the bushing insulation detection device based on dielectric spectroscopy, it is characterized in that: it comprises variable-frequency power sources, the series resonance increasing apparatus, standard potential transformer, current detection module, measure and control module, described variable-frequency power sources, the series resonance increasing apparatus, standard potential transformer, a current detection module end separately is connected with control module with measurement respectively, variable-frequency power sources, the series resonance increasing apparatus, an other end of standard potential transformer is connected to the high-pressure side of tested sleeve pipe, the other end of current detection module is connected to the end shield terminal of tested sleeve pipe.
2. the bushing insulation detection device based on dielectric spectroscopy as claimed in claim 1 is characterized in that: described variable-frequency power sources provides that frequency 0.001Hz-1000Hz is adjustable, the low pressure sinusoidal experiments power supply of voltage magnitude 100V, power supply capacity 10W; The series resonance increasing apparatus provides 0-500kV adjustable, the sinusoidal wave high-voltage test electric power that frequency 40Hz-300Hz is adjustable, power supply capacity 20kW; Current detecting unit measurement range 0-1A, 0.1 grade of accuracy, standard potential transformer is for filling SF6 insulation standard potential transformer, 0.1 grade of accuracy.
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| CN 201220711437 CN203025310U (en) | 2012-12-20 | 2012-12-20 | High-voltage sleeve insulation detection device based on frequency domain dielectric spectrum |
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| CN 201220711437 CN203025310U (en) | 2012-12-20 | 2012-12-20 | High-voltage sleeve insulation detection device based on frequency domain dielectric spectrum |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105044564A (en) * | 2015-05-29 | 2015-11-11 | 广西电网有限责任公司电力科学研究院 | Method and device for detecting cable insulation dielectric spectrum |
| CN107462614A (en) * | 2017-09-06 | 2017-12-12 | 贵州电网有限责任公司 | A kind of paper oil insulation moisture content assessment method being lost based on polarization loss and conductance |
| CN107561371A (en) * | 2017-08-25 | 2018-01-09 | 西南交通大学 | A kind of accelerated test method of oil-immersed sleeve pipe frequency domain dielectric response experiment |
| CN107917936A (en) * | 2017-11-21 | 2018-04-17 | 保定天威互感器有限公司 | A kind of method for judging whether insulator dielectric loss is qualified |
| CN109188104A (en) * | 2018-10-12 | 2019-01-11 | 国网陕西省电力公司电力科学研究院 | The dielectric response of paper oil insulation casing not blackouts monitoring system and method |
| CN111679167A (en) * | 2020-07-27 | 2020-09-18 | 中车青岛四方机车车辆股份有限公司 | Vehicle-mounted transformer bushing insulation performance evaluation method and test platform |
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| CN111880050A (en) * | 2020-05-27 | 2020-11-03 | 西安交通大学 | Oil paper sleeve damp positioning method based on polarity reversal time domain dielectric response |
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2012
- 2012-12-20 CN CN 201220711437 patent/CN203025310U/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105044564A (en) * | 2015-05-29 | 2015-11-11 | 广西电网有限责任公司电力科学研究院 | Method and device for detecting cable insulation dielectric spectrum |
| CN105044564B (en) * | 2015-05-29 | 2017-11-07 | 广西电网有限责任公司电力科学研究院 | A kind of cable insulation medium spectrum detection method and device |
| CN107561371A (en) * | 2017-08-25 | 2018-01-09 | 西南交通大学 | A kind of accelerated test method of oil-immersed sleeve pipe frequency domain dielectric response experiment |
| CN107462614A (en) * | 2017-09-06 | 2017-12-12 | 贵州电网有限责任公司 | A kind of paper oil insulation moisture content assessment method being lost based on polarization loss and conductance |
| CN107462614B (en) * | 2017-09-06 | 2019-10-29 | 贵州电网有限责任公司 | A kind of paper oil insulation moisture content assessment method being lost based on polarization loss and conductance |
| CN107917936A (en) * | 2017-11-21 | 2018-04-17 | 保定天威互感器有限公司 | A kind of method for judging whether insulator dielectric loss is qualified |
| CN109188104A (en) * | 2018-10-12 | 2019-01-11 | 国网陕西省电力公司电力科学研究院 | The dielectric response of paper oil insulation casing not blackouts monitoring system and method |
| CN111880049A (en) * | 2020-05-27 | 2020-11-03 | 西安交通大学 | Oil paper sleeve damp positioning method based on polarity inversion frequency domain dielectric response |
| CN111880050A (en) * | 2020-05-27 | 2020-11-03 | 西安交通大学 | Oil paper sleeve damp positioning method based on polarity reversal time domain dielectric response |
| CN111880049B (en) * | 2020-05-27 | 2021-09-10 | 西安交通大学 | Oil paper sleeve damp positioning method based on polarity inversion frequency domain dielectric response |
| CN111679167A (en) * | 2020-07-27 | 2020-09-18 | 中车青岛四方机车车辆股份有限公司 | Vehicle-mounted transformer bushing insulation performance evaluation method and test platform |
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