CN102981062A - 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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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 insulation detection technique field, be specifically related to a kind of bushing insulation detecting method based on dielectric spectroscopy, the method adopts based on the insulation of dielectric spectroscopy test to sleeve pipe and detects.
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 the power equipment, and the consequence that its mass defect or fault cause is very abominable, or causes huge economic loss even casualties.Be widely used at present the state of insulation detection of high-tension apparatus based on dielectric spectroscopy (frequency domain spectroscopy, the FDS) method of testing of dielectric response theory, 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 the sine voltage signal that changes 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 come the insulation status of judgment device by the frequency characteristic of equipment dielectric loss factor.
According to power industry standard " DL/T596-2005 power equipment preventive trial rules " to the sleeve pipe insulation detecting method at present, the dielectric dissipation factor (tan δ) that sleeve pipe carries out under the 50Hz power frequency 10kV voltage is measured, whether judged wearing out and the state that makes moist of cover pipe insulation less than a threshold value with the 50Hz dielectric dissipation factor.The patent of invention ZL03124730.X method of hidden danger " the on-line monitoring bushing shell for transformer insulation " has also proposed bushing shell for transformer dielectric dissipation factor under the on-line monitoring 50Hz and has been used for judging the method for sleeve pipe state of insulation.Although dielectric dissipation factor is measured the humidified insulation can find the part sleeve pipe and aging under the power frequency, 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 has humidified insulation or the sleeve pipe in treatment of aged later stage, and 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 occured a lot of through the withstand voltage and qualified bushing shell for transformer of partial discharge test, the serious accident of under normal operating condition, blasting.Therefore judge that with 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 the single power frequency.
But there is voltage characteristic in the dielectric dissipation factor of sleeve pipe, i.e. the Garton effect.The Garton effect is in containing the insulating medium of paper, and the dielectric dissipation factor under the low voltage may be its under high voltage 1～10 times.Stop transport or the Garton effect appears in sleeve pipe that standing time is long easily because the distribution situation of its well cuts, moisture and the sleeve pipe under the operating condition there is some difference.For operating sleeve pipe, because 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 the sleeve pipe that leaves standstill for a long time, its inner impurity, moisture etc. are in suspended state, and when carrying out the low-voltage Dielectric Loss Test, the interfacial polarization of ion is serious, so that the tan δ value of measuring is relatively higher.So the dielectric loss measurement under the sleeve pipe working voltage is carried out in recommendation.Present 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 the dielectric spectroscopy under the low-voltage is measured and may be caused the dielectric loss result that tests and sleeve pipe time of day may difference very large, affects the diagnosis and detection result.
State of insulation detects and assessment in order exactly bushing to be carried out, overcome the shortcoming of dielectric loss test under single-frequency and the low-voltage, be necessary that the dielectric spectroscopy of 0.001Hz-1000Hz is tested the sleeve pipe dielectric loss frequency curve that obtains to be revised and process, and avoids the impact of Garton effect.
Summary of the invention
Technical matters to be solved by this invention is: the dielectric loss frequency characteristic under the sleeve pipe low-voltage of obtaining for existing dielectric spectroscopy test and the deficiency of 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 the Obtaining Accurate sleeve pipe 0.001Hz-1000Hz scope, thereby reach a kind of bushing insulation detecting method based on dielectric spectroscopy of 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 may further comprise the steps:
Step 1: the high-pressure side that variable-frequency power sources is 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, the end shield terminal that current detection module is connected tested sleeve pipe, control variable-frequency power sources output frequency is in the 0.001Hz-1000Hz scope, the voltage of amplitude 100V, by the phase differential of 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: the series resonance increasing apparatus is connected with the high-pressure side of tested sleeve pipe, 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, the end shield terminal that current detection module is connected tested sleeve pipe, by adjusting electric voltage frequency and the amplitude of series resonance increasing apparatus, obtain and be no less than 5 Frequency points in the 40Hz-300Hz scope, and voltage is the sleeve pipe dielectric dissipation factor tan δ of sleeve pipe rated voltage;
Step 3: sleeve pipe dielectric dissipation factor (tan δ) and sleeve pipe dielectric dissipation factor (tan δ) frequency curve of 0.001Hz-1000Hz scope 100V voltage of 5 Frequency points measuring under the 40Hz-300Hz scope rated voltage are compared, if the deviation 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 all＜5%, think that namely the 0.001Hz-1000Hz scope is measured under the low-voltage sleeve pipe dielectric dissipation factor is not subjected 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 namely the 0.001Hz-1000Hz scope is measured under the low-voltage sleeve pipe dielectric dissipation factor has been subject to the impact of Garton effect, these group data are invalid;
Step 5: because standing time, the Garton effect appearred in long sleeve pipe easily, because the impact of Garton effect, tan δ is greater than tan δ under the high voltage under the general low-voltage; In the case, be continuously applied rated voltage is measured certain Frequency point after one hour tan δ by the series resonance increasing apparatus to sleeve pipe
1, then be depressured to the tan δ that 100V observes same frequency point
2Value;
Step 6: because electric field action, when sleeve pipe applied rated voltage, its inner impurity, attachment of moisture were at capacitance of bushing screen surfaces, insulator inwall, and the impurity phase of dielectric space is to reducing, and polarization loss is relatively little, and dielectric loss is reduced.If tan is δ
2With tan δ
1Deviation＜5%, think that then sleeve pipe Garton effects is less, should adopt immediately variable-frequency power sources to carry out test under the 100V voltage, obtain sleeve pipe is judged sleeve pipe at the tan of 0.001Hz-1000Hz scope δ frequency curve state of insulation;
Step 7: if tan is δ
2With tan δ
1Deviation 5%, think that then sleeve pipe is subjected 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 sleeve pipe is judged sleeve pipe at the tan of 0.001Hz-1000Hz scope δ frequency curve state of insulation.
The invention has the beneficial effects as follows: by the present invention, the impact of having avoided the Garton effect that tan δ under the low-voltage is measured, obtained sleeve pipe under 0.001Hz-1000Hz scope low-voltage true tan δ frequency curve and be used for judging the state of insulation of sleeve pipe, compare tradition and adopt the tan δ of the single 50Hz Frequency point of sleeve pipe to judge the sleeve pipe state of insulation, improved Accuracy of Judgement.The realization simple in structure, easy of test of the present invention and measurement mechanism has been avoided carrying out 0.001Hz-1000Hz scope tan δ under the employing high voltage and has been measured the difficult problem that its test unit is difficult to realize.
Description of drawings
Fig. 1 is the structural drawing 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 among 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 sourcess 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 specify the embodiment of the invention 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 may further comprise the 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 tested sleeve pipe, control variable-frequency power sources 9 output frequencies are in the 0.001Hz-1000Hz scope, the voltage of amplitude 100V, by the phase differential of 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 tested sleeve pipe, by adjusting electric voltage frequency and the amplitude of series resonance increasing apparatus 8, obtain and be no less than 5 Frequency points in the 40Hz-300Hz scope, 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 measuring under the 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 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 all＜5%, think that namely the 0.001Hz-1000Hz scope is measured under the low-voltage sleeve pipe dielectric dissipation factor is not subjected 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 namely the 0.001Hz-1000Hz scope is measured under the low-voltage sleeve pipe dielectric dissipation factor has been subject to the impact of Garton effect, these group data are invalid;
Step 5: because standing time, the Garton effect appearred in long sleeve pipe easily, because the impact of Garton effect, tan δ is greater than tan δ under the high voltage under the general low-voltage; In the case, be continuously applied rated voltage is measured certain Frequency point after one hour tan δ by the series resonance increasing apparatus to sleeve pipe
1, then be depressured to the tan δ that 100V observes same frequency point
2Value;
Step 6: because electric field action, when sleeve pipe applied rated voltage, its inner impurity, attachment of moisture were at capacitance of bushing screen surfaces, insulator inwall, and the impurity phase of dielectric space is to reducing, and polarization loss is relatively little, and dielectric loss is reduced.If tan is δ
2With tan δ
1Deviation＜5%, think that then sleeve pipe Garton effects is less, sleeve pipe is judged sleeve pipe at the tan of 0.001Hz-1000Hz scope δ frequency curve state of insulation is obtained in the test that should adopt immediately variable-frequency power sources 9 to carry out under the 100V voltage;
Step 7: if tan is δ
2With tan δ
1Deviation 5%, think that then sleeve pipe is subjected 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 sleeve pipe is judged sleeve pipe at the tan of 0.001Hz-1000Hz scope δ frequency curve state of insulation.
Below exemplify an embodiment and further specify the invention process 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 with current detection module 5 joint sleeves, flange 3 ground connection with tested sleeve pipe, by measuring with control module 10 control variable-frequency power sourcess 9 output frequencies in the 0.001Hz-1000Hz scope, 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.
With 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 tested sleeve pipe, end shield terminal 2 with 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 voltage is the sleeve pipe dielectric dissipation factor tan δ of sleeve pipe rated voltage, such as the tan δ under (B the organizes data) 45Hz under in rated voltage
45B=0.351%, tan δ under the 65Hz
65B=0.352%, tan δ under the 75Hz
75B=0.353%, tan δ under the 105Hz
105B=0.354%, tan δ under the 120Hz
120B=0.356%.
Contrast 0.001Hz-1000Hz scope, the dielectric dissipation factor of measuring under the 100V voltage is respectively (A organizes data) tan δ at 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 the low-voltage is bigger than normal more than 10% than the tan δ value under the rated voltage.Think that the dielectric loss measurement under the 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 that is in ageing state.
In the case, be continuously applied rated voltage is measured 65Hz after 1 hour tan δ by series resonance increasing apparatus 8 to casing high pressure end 1
1=0.351%, then be depressured to 100V, the tan δ of 65Hz
2=0.362%, both deviations think that less than 5% 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, contrasting identical frequency test, to put its result be (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%, compare with the dielectric loss of (B organizes data) corresponding frequencies point of measuring under the 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, can judge by this curve the state of insulation of sleeve pipe, finally judge that by this curve this sleeve pipe is in good condition.
Claims (1)
1. bushing insulation detecting method based on dielectric spectroscopy, it is characterized in that: it may further comprise the steps:
Step 1: the high-pressure side that variable-frequency power sources is 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, the end shield terminal that current detection module is connected tested sleeve pipe, control variable-frequency power sources output frequency is in the 0.001Hz-1000Hz scope, the voltage of amplitude 100V, by the phase differential of 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: the series resonance increasing apparatus is connected with the high-pressure side of tested sleeve pipe, 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, the end shield terminal that current detection module is connected tested sleeve pipe, by adjusting electric voltage frequency and the amplitude of series resonance increasing apparatus, obtain and be no less than 5 Frequency points in the 40Hz-300Hz scope, and voltage is the sleeve pipe dielectric dissipation factor tan δ of sleeve pipe rated voltage;
Step 3: sleeve pipe dielectric dissipation factor (tan δ) and sleeve pipe dielectric dissipation factor (tan δ) frequency curve of 0.001Hz-1000Hz scope 100V voltage of 5 Frequency points measuring under the 40Hz-300Hz scope rated voltage are compared, if the deviation 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 all＜5%, think that namely the 0.001Hz-1000Hz scope is measured under the low-voltage sleeve pipe dielectric dissipation factor is not subjected 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 namely the 0.001Hz-1000Hz scope is measured under the low-voltage sleeve pipe dielectric dissipation factor has been subject to the impact of Garton effect, these group data are invalid;
Step 5: because standing time, the Garton effect appearred in long sleeve pipe easily, because the impact of Garton effect, tan δ is greater than tan δ under the high voltage under the general low-voltage; In the case, be continuously applied rated voltage is measured certain Frequency point after one hour tan δ by the series resonance increasing apparatus to sleeve pipe
1, then be depressured to the tan δ that 100V observes same frequency point
2Value;
Step 6: because electric field action, when sleeve pipe applied rated voltage, its inner impurity, attachment of moisture were at capacitance of bushing screen surfaces, insulator inwall, and the impurity phase of dielectric space is to reducing, and polarization loss is relatively little, and dielectric loss is reduced.If tan is δ
2With tan δ
1Deviation＜5%, think that then sleeve pipe Garton effects is less, should adopt immediately variable-frequency power sources to carry out test under the 100V voltage, obtain sleeve pipe is judged sleeve pipe at the tan of 0.001Hz-1000Hz scope δ frequency curve state of insulation;
Step 7: if tan is δ
2With tan δ
1Deviation 5%, think that then sleeve pipe is subjected 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 sleeve pipe is judged sleeve pipe at the tan of 0.001Hz-1000Hz scope δ frequency curve state of insulation.
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