CN102981062B - Insulation detection method for high voltage bushing based on frequency domain dielectric spectroscopy - Google Patents
Insulation detection method for high voltage bushing based on frequency domain dielectric spectroscopy Download PDFInfo
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- 238000009413 insulation Methods 0.000 title claims abstract description 42
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- 238000001566 impedance spectroscopy Methods 0.000 title claims abstract description 17
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- 239000012535 impurity Substances 0.000 claims description 9
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Abstract
The invention relates to the technical field of insulation detection for high voltage equipment, in particular to an insulation detection method for a high voltage bushing based on frequency domain dielectric spectroscopy. The method comprises the step that a frequency domain dielectric spectroscopy based test is adopted to detect insulation of the bushing. With the adoption of the method, an influence of a Garton effect on measuring of tan delta at low voltage is avoided; a real tan delta frequency curve of the bushing at 0.001-1000Hz and at the low voltage is acquired and used for judging an insulation state of the bushing; and compared with the traditional bushing adopting a single 50Hz frequency point tan delta to judge the insulation state of the bushing, the judgment accuracy is improved. The test and a measuring device of the method are simple in structure and easy to operate, and the difficulty that the test and the device are difficult to operate when the measuring of the tan delta of the bushing is conducted at 0.001-1000Hz and at high voltage is solved.
Description
Technical field
The present invention relates to high voltage installation technical field of insulation detection, be specifically related to a kind of bushing insulation detecting method based on dielectric spectroscopy, the method adopts and detects the insulation of sleeve pipe based on dielectric spectroscopy test.
Background technology
Along with construction that is super, UHV Transmission Engineering, the electric power conveying rising of electric pressure and the increase of transmission line capability, improve day by day to the requirement of power transmission and transforming equipment safe and stable operation.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 huge economic loss even casualties.The state of insulation that current dielectric spectroscopy (frequency domain spectroscopy, the FDS) method of testing based on dielectric response theory is widely used in high-tension apparatus detects, for assessment of humidified insulation and the ageing state of high-tension apparatus.The measuring principle of dielectric spectroscopy be a low-voltage (being generally no more than 200V) applies to tested device 0.001Hz-1000Hz within the scope of the sine voltage signal of change, checkout equipment dielectric dissipation factor at different frequencies, carrys out the insulation status of judgment device by the frequency characteristic of equipment dielectric loss factor.
Current is according to power industry standard " DL/T596-2005 power equipment preventive trial code " to sleeve pipe insulation detecting method, the dielectric dissipation factor (tan δ) that sleeve pipe carries out under 50Hz power frequency 10kV voltage is measured, whether is less than a threshold value to judge the aging of cover pipe insulation and state of making moist with 50Hz dielectric dissipation factor.The patent of invention ZL03124730.X method of hidden danger " the on-line monitoring bushing shell for transformer insulation " it is also proposed bushing shell for transformer dielectric dissipation factor under on-line monitoring 50Hz and method for judging sleeve pipe state of insulation.Although Dielectric Posts can find the humidified insulation of part tubular and aging under power frequency, its information content obtained 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 the sleeve pipe in humidified insulation or treatment of aged later stage, the dielectric dissipation factor of its power frequency 50Hz meets standard-required, but can judge to have made moist by analyzing its dielectric loss frequency characteristic.In power industry, also occurred a lot of through withstand voltage and that partial discharge test is qualified bushing shell for transformer, the serious accident of blasting under normal operating conditions.Therefore use the sleeve pipe dielectric dissipation factor frequency characteristic measured under wider frequency section more accurate to judge that the state of insulation of sleeve pipe judges than 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.Garton effect is containing in the dielectric of paper, and the dielectric dissipation factor under low voltage may be its at higher voltages 1 ~ 10 times.Stop transport or standing time longer sleeve pipe easily there is Garton effect because the sleeve pipe under the distribution situation of its well cuts, moisture and 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 minimizing, and polarization loss is relatively little; And the long-time sleeve pipe left standstill, its inner impurity, moisture etc. are in suspended state, and when carrying out low-voltage Dielectric Loss Test, the interfacial polarization of ion is serious, make the tan δ value of measurement relatively higher.So recommend the dielectric loss measurement carried out under sleeve pipe working voltage.Current dielectric spectroscopy tester, its voltage is generally no more than 200V, even if the voltage ranging up to 2kV is also much smaller than the working voltage of bushing, and the HV test equipment of 0.001Hz-1000Hz scope has larger difficulty.Therefore the dielectric spectroscopy measurement under low-voltage may cause the dielectric loss result of test and the possible difference of sleeve pipe time of day very greatly, affects diagnosis and detection result.
In order to carry out state of insulation detection and assessment to bushing exactly, overcome the shortcoming of dielectric loss test under single-frequency and low-voltage, be necessary that the sleeve pipe dielectric loss frequency curve to the dielectric spectroscopy test of 0.001Hz-1000Hz obtains is revised and processed, avoid the impact of Garton effect.
Summary of the invention
Technical problem to be solved by this invention is: the deficiency assessing sleeve pipe state of insulation for the dielectric loss frequency characteristic under the sleeve pipe low-voltage that existing dielectric spectroscopy test obtains and the single power frequency dielectric loss measurement of tradition, a kind of impact can avoiding sleeve pipe Garton effect is provided, comparatively true medium loss frequency characteristic within the scope of Obtaining Accurate sleeve pipe 0.001Hz-1000Hz, thus a kind of bushing insulation detecting method based on dielectric spectroscopy reaching accurate evaluation sleeve pipe state of insulation.
For achieving the above object, the technical solution used in the present invention is: a kind of bushing insulation detecting method based on dielectric spectroscopy, and it comprises the following steps:
Step one: high-pressure side variable-frequency power sources being connected to tested sleeve pipe, disconnect the connecting line of the high-pressure side of series resonance increasing apparatus and tested sleeve pipe, standard potential transformer is connected to the high-pressure side detectable voltage signals of tested sleeve pipe, current detection module is connected the end shield terminal of tested sleeve pipe, control variable-frequency power sources output frequency in 0.001Hz-1000Hz scope, the voltage of amplitude 100V, by the phase difference of measuring voltage and current signal, thus detect the frequency curve of the sleeve pipe dielectric dissipation factor (tan δ) of 0.001Hz-1000Hz scope 100V voltage;
Step 2: the high-pressure side of series resonance increasing apparatus with tested sleeve pipe is connected, disconnect the connecting line of the high-pressure side of variable-frequency power sources and tested sleeve pipe, standard potential transformer is connected to the high-pressure side detectable voltage signals of tested sleeve pipe, current detection module is connected the end shield terminal of tested sleeve pipe, by electric voltage frequency and the amplitude of adjustment series resonance increasing apparatus, obtain within the scope of 40Hz-300Hz and be no less than 5 Frequency points, and voltage is the sleeve pipe dielectric dissipation factor tan δ of sleeve pipe rated voltage;
Step 3: the sleeve pipe dielectric dissipation factor (tan δ) of 5 Frequency points measured under 40Hz-300Hz scope rated voltage and sleeve pipe dielectric dissipation factor (tan δ) frequency curve of 0.001Hz-1000Hz scope 100V voltage are compared, if 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, namely think that 0.001Hz-1000Hz scope is measured under low-voltage sleeve pipe dielectric dissipation factor is by the impact of Garton effect, the tan δ value measured value measured under 0.001Hz-1000Hz scope low-voltage is effective, tan δ frequency curve by this group 0.001Hz-1000Hz judges the state of insulation of sleeve pipe,
Step 4: if deviation all >5% 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, namely think that 0.001Hz-1000Hz scope is measured under low-voltage sleeve pipe dielectric dissipation factor receives the impact of Garton effect, this group data invalid;
Step 5: Garton effect easily appears in the sleeve pipe longer due to standing time, 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 measures certain Frequency point tan δ after one hour to sleeve pipe by series resonance increasing apparatus
1, be then 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 minimizing, and polarization loss is relatively little, and dielectric loss can be made to reduce.If tan is δ
2with tan δ
1deviation <5%, then think that sleeve pipe Garton effects is less, the test under variable-frequency power sources should be adopted immediately to carry out 100V voltage, obtain sleeve pipe and judge the state of insulation of sleeve pipe at the tan δ frequency curve of 0.001Hz-1000Hz scope;
Step 7: if tan is δ
2with tan δ
1deviation >5%, then think that the impact that sleeve pipe is subject to Garton effect is comparatively large, can step 5 be repeated, until tan δ
2with tan δ
1deviation <5% after carry out step 6, obtain sleeve pipe and judge the state of insulation of sleeve pipe at the tan δ frequency curve of 0.001Hz-1000Hz scope.
The invention has the beneficial effects as follows: pass through the present invention, avoid the impact that Garton effect is measured 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, comparing tradition adopts the tan δ of the single 50Hz Frequency point of sleeve pipe to judge sleeve pipe state of insulation, improves the accuracy of judgement.Test of the present invention and measurement mechanism structure simply, easily realize, and avoid to adopt to carry out 0.001Hz-1000Hz scope tan δ under high voltage and measure the difficult problem that its experimental rig is difficult to realize.
Accompanying drawing explanation
Fig. 1 is the structure chart of the bushing insulation detection device based on dielectric spectroscopy of the present invention;
Fig. 2 is measurement procedure figure of the present invention.
The high-pressure side of 1-tested sleeve pipe in Fig. 1, the end shield terminal of 2-tested sleeve pipe, the flange of 3-tested sleeve pipe, 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, 9-variable-frequency power sources, 10-Measurement & Control module.
Detailed description of the invention
The embodiment of the present invention is further illustrated below in conjunction with accompanying drawing.
As shown in Figure 1 and Figure 2, a kind of bushing insulation detecting method based on dielectric spectroscopy, it comprises the following steps:
Step one: the high-pressure side 1 variable-frequency power sources 9 being 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, current detection module 5 is connected the end shield terminal 2 of tested sleeve pipe, control variable-frequency power sources 9 output frequency in 0.001Hz-1000Hz scope, the voltage of amplitude 100V, by the phase difference of measuring voltage and current signal, thus 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, current detection module 5 is connected the end shield terminal 2 of tested sleeve pipe, by electric voltage frequency and the amplitude of adjustment series resonance increasing apparatus 8, obtain within the scope of 40Hz-300Hz and be no less than 5 Frequency points, and voltage is the sleeve pipe dielectric dissipation factor tan δ of sleeve pipe rated voltage;
Step 3: the sleeve pipe dielectric dissipation factor tan δ frequency curve of the sleeve pipe dielectric dissipation factor tan δ of 5 Frequency points measured under 40Hz-300Hz scope rated voltage and 0.001Hz-1000Hz scope 100V voltage is compared, if 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, namely think that 0.001Hz-1000Hz scope is measured under low-voltage sleeve pipe dielectric dissipation factor is by the impact of Garton effect, the tan δ value measured value measured under 0.001Hz-1000Hz scope low-voltage is effective, tan δ frequency curve by this group 0.001Hz-1000Hz judges the state of insulation of sleeve pipe,
Step 4: if deviation all >5% 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, namely think that 0.001Hz-1000Hz scope is measured under low-voltage sleeve pipe dielectric dissipation factor receives the impact of Garton effect, this group data invalid;
Step 5: Garton effect easily appears in the sleeve pipe longer due to standing time, 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 measures certain Frequency point tan δ after one hour to sleeve pipe by series resonance increasing apparatus
1, be then 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 minimizing, and polarization loss is relatively little, and dielectric loss can be made to reduce.If tan is δ
2with tan δ
1deviation <5%, then think that sleeve pipe Garton effects is less, the test under variable-frequency power sources 9 should be adopted immediately to carry out 100V voltage, obtain sleeve pipe and judge the state of insulation of sleeve pipe at the tan δ frequency curve of 0.001Hz-1000Hz scope;
Step 7: if tan is δ
2with tan δ
1deviation >5%, then think that the impact that sleeve pipe is subject to Garton effect is comparatively large, can step 5 be repeated, until tan δ
2with tan δ
1deviation <5% after carry out step 6, obtain sleeve pipe and judge the state of insulation of sleeve pipe at the tan δ frequency curve of 0.001Hz-1000Hz scope.
Below exemplify an embodiment and illustrate the invention process step further:
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, by the end shield terminal 2 of current detection module 5 joint sleeve, by flange 3 ground connection of tested sleeve pipe, variable-frequency power sources 9 output frequency is controlled in 0.001Hz-1000Hz scope by Measurement & Control module 10, the voltage of amplitude 100V, Measurement & Control module 10 connection standard voltage transformer 4 and current detection module 5, obtain voltage and current signal respectively, thus detect the frequency curve of the sleeve pipe dielectric dissipation factor (tan δ) of 0.001Hz-1000Hz scope 100V voltage.
By the connection of series resonance increasing apparatus 8 with the high-pressure side 1 of tested sleeve pipe, disconnect the connection of the high-pressure side 1 of variable-frequency power sources 9 and tested sleeve pipe, standard potential transformer 4 is connected high-pressure side 1 detectable voltage signals of tested sleeve pipe, by the end shield terminal 2 of current detection module 5 joint sleeve, casing flange 3 ground connection, Measurement & Control module 10 adjusts electric voltage frequency and the amplitude of series resonance increasing apparatus 8, Measurement & Control module 10 connection standard voltage transformer 4 and current detection module 5, obtain at least 5 Frequency points within the scope of 40Hz-300Hz, and voltage is the sleeve pipe dielectric dissipation factor tan δ of sleeve pipe rated voltage, as the tan δ under (the B group data) 45Hz under 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 measured under 100V voltage is respectively (A group 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, the tan δ value under discovery low-voltage is than the tan δ value bigger than normal more than 10% under rated voltage.Think that the dielectric loss measurement under low-voltage receives the impact of sleeve pipe Garton effect, the sleeve pipe tan δ data of 0.001Hz-1000Hz scope 100V voltage are invalid data, if judged the state of insulation of sleeve pipe by these group data, may be the sleeve pipe being in ageing state by casing evaluation in good condition.
In the case, be continuously applied rated voltage measures 65Hz tan δ after 1 hour to casing high pressure end 1 by series resonance increasing apparatus 8
1=0.351%, be then depressured to 100V, the tan δ of 65Hz
2=0.362%, both are less than 5% at deviation, think that the tan δ that low-voltage is measured is effective.Disconnect the line 7 of series resonance increasing apparatus 8 and casing high pressure end immediately, 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 its result of frequency test point for (C group 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%, compared with the dielectric loss of (B group data) the corresponding frequencies point measured under rated voltage before, 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, judge the state of insulation of sleeve pipe by this curve, judge that this sleeve pipe is in good condition eventually through this curve.
Claims (1)
1., based on a bushing insulation detecting method for dielectric spectroscopy, it is characterized in that: it comprises the following steps:
Step one: high-pressure side variable-frequency power sources being connected to tested sleeve pipe, disconnect the connecting line of the high-pressure side of series resonance increasing apparatus and tested sleeve pipe, standard potential transformer is connected to the high-pressure side detectable voltage signals of tested sleeve pipe, current detection module is connected the end shield terminal of tested sleeve pipe, control variable-frequency power sources output frequency in 0.001Hz-1000Hz scope, the voltage of amplitude 100V, by the phase difference of measuring voltage and current signal, thus detect the frequency curve of the sleeve pipe dielectric dissipation factor tan δ of 0.001Hz-1000Hz scope 100V voltage;
Step 2: the high-pressure side of series resonance increasing apparatus with tested sleeve pipe is connected, disconnect the connecting line of the high-pressure side of variable-frequency power sources and tested sleeve pipe, standard potential transformer is connected to the high-pressure side detectable voltage signals of tested sleeve pipe, current detection module is connected the end shield terminal of tested sleeve pipe, by electric voltage frequency and the amplitude of adjustment series resonance increasing apparatus, obtain within the scope of 40Hz-300Hz and be no less than 5 Frequency points, and voltage is the sleeve pipe dielectric dissipation factor tan δ of sleeve pipe rated voltage;
Step 3: the sleeve pipe dielectric dissipation factor tan δ frequency curve of the sleeve pipe dielectric dissipation factor tan δ of 5 Frequency points measured under 40Hz-300Hz scope rated voltage and 0.001Hz-1000Hz scope 100V voltage is compared, if 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, namely think that 0.001Hz-1000Hz scope is measured under low-voltage sleeve pipe dielectric dissipation factor is by the impact of Garton effect, the tan δ value measured value measured under 0.001Hz-1000Hz scope low-voltage is effective, tan δ frequency curve by this group 0.001Hz-1000Hz judges the state of insulation of sleeve pipe,
Step 4: if deviation all >5% 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, namely think that 0.001Hz-1000Hz scope is measured under low-voltage sleeve pipe dielectric dissipation factor receives the impact of Garton effect, this group data invalid;
Step 5: Garton effect easily appears in the sleeve pipe longer due to standing time, 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 measures certain Frequency point tan δ after one hour to sleeve pipe by series resonance increasing apparatus
1, be then 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 minimizing, and polarization loss is relatively little, and dielectric loss can be made to reduce; If tan is δ
2with tan δ
1deviation <5%, then think that sleeve pipe Garton effects is less, the test under variable-frequency power sources should be adopted immediately to carry out 100V voltage, obtain sleeve pipe and judge the state of insulation of sleeve pipe at the tan δ frequency curve of 0.001Hz-1000Hz scope;
Step 7: if tan is δ
2with tan δ
1deviation >5%, then think that the impact that sleeve pipe is subject to Garton effect is comparatively large, can step 5 be repeated, until tan δ
2with tan δ
1deviation <5% after carry out step 6, obtain sleeve pipe and judge the state of insulation of sleeve pipe at the tan δ frequency curve of 0.001Hz-1000Hz scope.
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| CN101986163B (en) * | 2010-08-23 | 2013-06-19 | 上海思创电器设备有限公司 | Field high-voltage dielectric-loss test vehicle for power equipment |
| CN202217031U (en) * | 2011-08-25 | 2012-05-09 | 广东电网公司江门供电局 | Insulation detection device for high voltage bushing of transformer |
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