CN203164308U - Transformer oil paper insulation test sample measuring device - Google Patents
Transformer oil paper insulation test sample measuring device Download PDFInfo
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- CN203164308U CN203164308U CN 201320145202 CN201320145202U CN203164308U CN 203164308 U CN203164308 U CN 203164308U CN 201320145202 CN201320145202 CN 201320145202 CN 201320145202 U CN201320145202 U CN 201320145202U CN 203164308 U CN203164308 U CN 203164308U
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Abstract
The utility model relates to a transformer oil paper insulation test sample measuring device, which comprises a measuring cylindrical body and an epoxy resin plate arranged on the top of the measuring cylindrical body. A pressure electrode, a measurement electrode and a protection electrode are sequentially arranged inside the measuring cylindrical body from top to bottom. The pressure electrode and the protection electrode are connected with the epoxy resin plate through conducting rods. Transformer oil paper to be measured is arranged between the pressure electrode and the measurement electrode. Compared with the prior art, the measuring device adopting the oil paper insulation three-electrode model can achieve relatively high test precision. In order to simulate the transformer running environment in reality, the sealing performance of the oil paper insulation test sample frequency domain dielectric spectrum measuring device is maintained during a heating aging process. The measuring device enables relatively high simulation effects. By changing the experiment conditions, experiment data in different situations can be conveniently detected.
Description
Technical field
The utility model relates to a kind of transformer measurement mechanism, especially relates to a kind of transformer oil paper insulation test product measurement mechanism.
Background technology
The paper oil insulation power equipment is in long-time running, under the effect of multiple stress such as electricity, heat, chemistry, thereby along with the growth of working time will cause the aging of insulation system, and can paper insulated wearing out have often determined whole insulation system work on, and people very pay close attention to for the aging of paper for this reason.On the one hand, temperature raises and can promote ager process greatly, according to covering the heat ageing 6 degree methods that Singh's rule is released, the every rising 6K of temperature, rate of ageing doubles, therefore can accelerate its ager process by improving paper oil insulation test product method of temperature, thereby obtain to have the test product of different degree of agings.On the other hand, the water cut in the solid insulation is occupied conclusive effect in the degraded of material, the acceleration that higher water cut is strong the degraded process.In order to study in the solid insulation water cut better to the influence of frequency domain dielectric spectra, the method that need take to soak suction and progressively dry has prepared the paper oil insulation test product of different moisture content, the test product of different insulative state is carried out the test of frequency domain dielectric spectra under different environmental factor effects, therefore how designing the device that obtains for test becomes one of present problem demanding prompt solution.
The utility model content
The purpose of this utility model is exactly the transformer oil paper insulation test product measurement mechanism that provides a kind of in order to overcome the defective that above-mentioned prior art exists and can obtain higher measuring accuracy, detects the experimental data under the different situations.
The purpose of this utility model can be achieved through the following technical solutions:
Transformer oil paper insulation test product measurement mechanism comprises and measures cylindrical shell and be arranged on the epoxy resin board of measuring the cylindrical shell top,
Be provided with the electrode of exerting pressure, potential electrode and guard electrode from top to bottom in the described measurement cylindrical shell, described electrode and the guard electrode of exerting pressure connects epoxy resin board through conducting rod, and described exerting pressure arranges transformer oilpaper to be measured between electrode and the potential electrode.
Be arranged with polytetrafluoroethylene floor on the conducting rod of connection epoxy resin board and guard electrode.
Described measurement cylindrical shell is the glass container made.
Splendid attire transformer oil in the described measurement cylindrical shell.
The transformer oil of splendid attire did not have transformer oilpaper to be measured.
Described transformer oilpaper is the insulating oil cardboard.
Compared with prior art, the utility model adopts paper oil insulation three electrode models, can obtain higher measuring accuracy, in order to imitate the environment of transformer in actual motion, the sealing that in the heat ageing process, keeps paper oil insulation test product frequency domain dielectric spectra measurement mechanism, have higher simulated effect, in addition, can detect experimental data under the different situations easily by changing experiment condition.
Description of drawings
Fig. 1 is structural representation of the present utility model,
Among the figure, 1 for epoxy resin board, 2 for conducting rod, 3 for the electrode of exerting pressure, 4 for the transformer oilpaper, 5 for guard electrode, 6 for polytetrafluoroethylene floor, 7 for measure cylindrical shell, 8 for potential electrode, 9 be transformer oil.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is elaborated.
Embodiment
Transformer oil paper insulation test product measurement mechanism; its structure as shown in Figure 1; comprise and measure cylindrical shell 7 and be arranged on the epoxy resin board 1 of measuring the cylindrical shell top; in measuring cylindrical shell 7, be provided with the electrode 3 of exerting pressure, potential electrode 8 and guard electrode 5 from top to bottom; electrode 3 and the guard electrode 5 of exerting pressure connects epoxy resin boards 1 through conducting rod 2, transformer oilpaper 4 to be measured is set exerting pressure between electrode 3 and the potential electrode 8.Wherein, be arranged with polytetrafluoroethylene floor 6 on the conducting rod 2 of connection epoxy resin board 1 and guard electrode 5.In order to improve sealing property, the measurement cylindrical shell 7 of employing is the glass container made.Measure splendid attire transformer oil 9 in the cylindrical shell 7 in use, transformer oil 9 did not have transformer oilpaper 4 to be measured, and this transformer oilpaper 4 is the insulating oil cardboard.
Employing the utility model can be to the influence to paper oil insulation frequency domain dielectric spectra of the different degree of aging of insulating oil cardboard, moisture and temperature
According to covering the heat ageing 6 degree methods that Singh's rule is released, the paper oil insulation test product as for continuing heating in the constant temperature high temperature oven, is carried out the FDS test every the regular hour.The design temperature of baking oven is 120 ℃.In baking oven, measured its 25 ℃ (room temperatures respectively in aging 0,48,96,144 etc. hours respectively, different weather may change about 2 ℃), 60 ℃, 90 ℃ FDS data, thereby obtain paper oil insulation FDS data under the different degree of agings, by initial analysis, discovery is along with the test product increase of heat time heating time in baking oven, and equivalent degree of aging is deepened, and dielectric loss tan δ has presented tangible increase tendency, especially in the low-frequency range performance obviously, high band is then distinguished very little.This mainly is because the result of the frequency characteristic effect of dielectric polorization.The dielectric loss of insulating medium mainly leads loss by electricity and polarization loss is formed, and polarization loss mainly by dipole polarization, interfacial polarization and dielectric interlayer polarization etc. diminish the polarization form, these polarization can only be lower than that effect obviously then has little time to take place relaxation phenomena at high band under the frequency range about 1Hz in frequency.Therefore, little to the dielectric loss tan δ influence of high band when insulating medium Yin Wendu raises and when decompositing little molecular polarity medium such as moisture, carboxylic acid, low-frequency range is then influenced significantly.
Simultaneously, along with the increase of test product degree of aging, the capacitance of test product has represented very big difference with frequency variation curve, and different in the influence of high band and low-frequency range.At high band, along with the increase of degree of aging, capacitance presents the trend of reduction; In low-frequency range, along with the increase of degree of aging, capacitance then increases rapidly.As seen along with degree of aging strengthens, the cardboard degree of polymerization reduces, and the cellulose cracking also becomes the little molecule of polarity, and the polarity of medium is strengthened, and must cause the increase of its capacitance.Yet at high band, although polarity strengthens, constant slack time of medium is very big, and the polarization required time is far longer than the cycle of power source change, the DIELECTRIC CONSTANT=ε of medium
∞, polar impurity does not play a leading role, and causes occurring along with degree of aging increases and the phenomenon of capacitance reduction.
In addition, for identical measurement temperature, the frequency of its tan δ of the test product-f curve minimum correspondence of different degree of agings remains unchanged, and minimum progressively increases along with the increase of degree of aging, so the dielectric loss minimum value of tan δ-f curve can be used as the characteristic information of its ageing state of reflection.For identical degree of aging, along with the increase of measuring temperature, tan δ-f curve minimum presents the trend of moving right.
To sum up, the impurity such as analyte that paper oil insulation produces in ageing process are mainly polarizable medium, and are obvious to the low-frequency range influence of frequency domain dielectric spectra.Frequency domain dielectric spectra during the research low frequency, extremely important with diagnosis to the analysis of paper oil insulation.The minimum value of the tan δ-f curve of paper oil insulation is moved on gradually with the intensification of degree of aging, and corresponding frequency remains unchanged substantially, can be used as the characteristic information of judging ageing state.
Along with the increase of water cut, the tan δ of test test product is obvious ascendant trend, mainly is that the increase of water cut must cause the increase of medium polarity loss because moisture is polar molecule.Article five, curve is apparent in view in the differentiation of high and low frequency section, and a little less than Mid Frequency (0.1-1Hz) is distinguished, and dielectric loss is also big with the speed of frequency change, distinguishes further reduction when curve has arrived 0.001Hz.Be the test product of 2mm for thickness, water cut is respectively 1%, 2%, and 3% and 4% curve is when 0.001Hz even occurred overlapping; And be the test product of 3mm for thickness, then cross over point moves to high frequency, and greatly about 0.01Hz, then curved intersection if can predict survey frequency reduces again, the situation of similar thickness 3mm test product then also can occur.This point of crossing is then relevant with the thickness of test product.As seen oil-paper FDS characteristic is not only relevant with test product state of insulation (residual water content), and is subjected to the influence (moisture distribution situation etc.) of insulation system.
For the test product experiment, whether ground connection is remarkable to the measurement result influence for test product in the measuring process.According to former experiment, when the test product capacitance is big (the nF order of magnitude), it is consistent adopting UST to measure the gained curve with GST, and measuring error is also very little.And according to Fig. 4-8 (a) (thickness 2mm, the test product of water cut 1%, the about 60pF of electric capacity), because test product capacitance ageing oil paper insulation test product relatively in the past improves greatly, UST measures the situation that negative value no longer occurs, but still bigger with GST measurement result difference at high band, cause the moisture value difference of institute's match under two kinds of situations very big, the power frequency capacitance difference that records is also very big.And again by Fig. 4-8 (b) (thickness 2mm, the test product of water cut 7%, the about 94pF of electric capacity), UST and GST curve overlap substantially, and match gained moisture is also consistent, and the increase along with capacitance is described, measurement result more more accurately and reliably.In addition, same test product GST measuring method gained capacitance is the test product of 2mm apparently higher than UST method institute measured value for thickness, differs 7-8pF, and is the test product of 3mm for thickness, and difference is then up to about 11pF.
The measurement result of environment temperature and FDS has stronger relation, and as raising along with temperature, FDS curve integral body presents the trend that right avertence is moved.Can adopt the Arrhenius model to make an explanation to this, i.e. 8～10 ℃ of every risings of temperature, chemical reaction velocity can increase by 2～4 times.After the temperature increase, intermolecular interaction force strengthens, degree of polarization is corresponding enhancing also, and the FDS curve moves generally with temperature, but after the ring temperature acquires a certain degree (greater than 20 ℃), the FDS curve flex point occurred at different low frequency places, analyze its reason, under different ring temperature, cause that the mechanism of polarization is different, same test product, and have characteristic.
Further analyze, temperature depends primarily on two factors to the influence of FDS curve: conductivity and oilpaper water balance relation.When temperature raise, the conductivity of oil increased, and moisture moves from cardboard to oil, causes the increase of dielectric loss; Concerning insulating paper, owing to the reduction of water cut reduces dielectric loss, and in the low-frequency range performance obviously.
When therefore physical device was used at the scene, environment temperature was particularly important to measurement result.As being example with the power transformer, the oily temperature gradual slow in back of just having stopped transport descends, and best measuring condition is that transformer is through leaving standstill the state that reaches temperature stabilization for a long time.In addition, the oil temperature of power transformer each several part distributes and is inhomogeneous, and normally head temperature is higher, and bottom temp is lower.Consider comprehensive effect, should carry out Measurement and analysis with the oily temperature at equipment middle part.
Claims (6)
1. transformer oil paper insulation test product measurement mechanism is characterized in that, this device comprises to be measured cylindrical shell and be arranged on the epoxy resin board of measuring the cylindrical shell top,
Be provided with the electrode of exerting pressure, potential electrode and guard electrode from top to bottom in the described measurement cylindrical shell, described electrode and the guard electrode of exerting pressure connects epoxy resin board through conducting rod, and described exerting pressure arranges transformer oilpaper to be measured between electrode and the potential electrode.
2. transformer oil paper insulation test product measurement mechanism according to claim 1 is characterized in that, is arranged with polytetrafluoroethylene floor on the conducting rod of connection epoxy resin board and guard electrode.
3. transformer oil paper insulation test product measurement mechanism according to claim 1 is characterized in that described measurement cylindrical shell is the glass container made.
4. according to claim 1 or 3 described transformer oil paper insulation test product measurement mechanisms, it is characterized in that splendid attire transformer oil in the described measurement cylindrical shell.
5. transformer oil paper insulation test product measurement mechanism according to claim 4 is characterized in that the transformer oil of splendid attire did not have transformer oilpaper to be measured.
6. transformer oil paper insulation test product measurement mechanism according to claim 1 or 5 is characterized in that described transformer oilpaper is the insulating oil cardboard.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320145202 CN203164308U (en) | 2013-03-27 | 2013-03-27 | Transformer oil paper insulation test sample measuring device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320145202 CN203164308U (en) | 2013-03-27 | 2013-03-27 | Transformer oil paper insulation test sample measuring device |
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| CN203164308U true CN203164308U (en) | 2013-08-28 |
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| CN 201320145202 Expired - Lifetime CN203164308U (en) | 2013-03-27 | 2013-03-27 | Transformer oil paper insulation test sample measuring device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103176058A (en) * | 2013-03-27 | 2013-06-26 | 国家电网公司 | Device for measuring transformer oil paper insulation test piece |
| CN104101820A (en) * | 2014-07-17 | 2014-10-15 | 国网上海市电力公司 | Transformer oil/paper insulation aging experimental device and method |
| CN104237288A (en) * | 2014-09-29 | 2014-12-24 | 国家电网公司 | Ring current heating method-based transformer insulation thermal ageing test method and device |
| CN104634823A (en) * | 2015-01-26 | 2015-05-20 | 江南大学 | Method for rapidly detecting content of polar components in frying oil |
| CN106644557A (en) * | 2017-01-04 | 2017-05-10 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Transformer-insulating-material same-condition-aging staging sampling testing device |
| CN108732479A (en) * | 2018-05-25 | 2018-11-02 | 云南电网有限责任公司电力科学研究院 | Visualization paper oil insulation electric heating based on magnon agitation cycle combines aging equipment |
-
2013
- 2013-03-27 CN CN 201320145202 patent/CN203164308U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103176058A (en) * | 2013-03-27 | 2013-06-26 | 国家电网公司 | Device for measuring transformer oil paper insulation test piece |
| CN104101820A (en) * | 2014-07-17 | 2014-10-15 | 国网上海市电力公司 | Transformer oil/paper insulation aging experimental device and method |
| CN104101820B (en) * | 2014-07-17 | 2016-09-21 | 国网上海市电力公司 | A kind of transformer oil/Aging of Oil-paper Insulation in Oil experimental provision and experimental technique |
| CN104237288A (en) * | 2014-09-29 | 2014-12-24 | 国家电网公司 | Ring current heating method-based transformer insulation thermal ageing test method and device |
| CN104237288B (en) * | 2014-09-29 | 2016-09-28 | 国家电网公司 | Transformer insulated thermal aging test method and device based on circular current heating |
| CN104634823A (en) * | 2015-01-26 | 2015-05-20 | 江南大学 | Method for rapidly detecting content of polar components in frying oil |
| CN104634823B (en) * | 2015-01-26 | 2017-05-03 | 江南大学 | Method for rapidly detecting content of polar components in frying oil |
| CN106644557A (en) * | 2017-01-04 | 2017-05-10 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Transformer-insulating-material same-condition-aging staging sampling testing device |
| CN106644557B (en) * | 2017-01-04 | 2023-05-16 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Testing device for transformer insulating material under same condition aging stage sampling |
| CN108732479A (en) * | 2018-05-25 | 2018-11-02 | 云南电网有限责任公司电力科学研究院 | Visualization paper oil insulation electric heating based on magnon agitation cycle combines aging equipment |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130828 |
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| CX01 | Expiry of patent term |