CN102096032B - Experimental facility and method for electric heating combined stress aging with oil-paper insulation of transformer - Google Patents
Experimental facility and method for electric heating combined stress aging with oil-paper insulation of transformer Download PDFInfo
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- CN102096032B CN102096032B CN 201110001946 CN201110001946A CN102096032B CN 102096032 B CN102096032 B CN 102096032B CN 201110001946 CN201110001946 CN 201110001946 CN 201110001946 A CN201110001946 A CN 201110001946A CN 102096032 B CN102096032 B CN 102096032B
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Abstract
The invention relates to an experimental facility and method for electric heating combined stress aging with oil-paper insulation of a transformer, wherein the facility has the advantages of simple structure and good use effect, is safe in running and convenient in sampling. The experimental facility comprises an outer cavity which is internally provided with at least one sealed inner cavity; the inner cavity is internally provided with a testing device which is provided with a high-voltage electrode and a low-voltage electrode; a sample is arranged between the high-voltage electrode and the low-voltage electrode which are mutually pressed; and the high-voltage electrode is connected with a high-voltage power supply and a current measurement and display system outside the outer cavity respectively.
Description
Technical field
The invention belongs to transformer ageing state detection technique field, be specifically related to aging experimental provision and the method for a kind of transformer oil paper insulated electrothermic associating stress.
Background technology
Transformer especially large oil immersed power transformer is one of vital equipment in the electric system, the safety and stability of its operational reliability direct relation electric system, statistical data shows, the interruption of service of transformer is mainly caused by its insulation system fault, and the operation life of transformer depends on the ageing state of Oil-Paper Insulation to a great extent.Therefore, the ageing state of Accurate Diagnosis Oil-Paper Insulation, most important to the life-span of prediction transformer, also be prerequisite and the basis of realizing that transformer state is safeguarded.
In most of transformers, its insulation system mainly contains the cellulose cardboard and transformer oil consists of, and the former mainly plays insulation and supports, and the latter is mainly used to insulation and cooling.In the transformer operational process, paper oil insulation bears the multiple external stress effects such as heat, electricity, machinery, chemistry for a long time, under above-mentioned multiple effect of stress, cellulose cardboard and transformer oil all can be aging gradually along with the accumulation of working time, and produce some ageing products, such as ethene, acetylene, Wei Shui, furan compound etc., cause self insulation and mechanical property to descend gradually and also may cause transformer fault.Because transformer is under normal operation stress condition, the paper oil insulation ageing process is very slow, it is very long and unrealistic to carry out with this understanding the experimental study time, therefore more under the high stress level paper oil insulation is being carried out the main path that the accelerated deterioration experiment becomes domestic and international experts and scholars' Research on Oil Aging of Oil-paper Insulation in Oil rule, explores aging inherent mechanism.
At present, in actual experiment research, mainly contain following several paper oil insulation quick aging method, such as the acceleration heat ageing of carrying out under at higher temperature,, comprehensive accelerated deterioration under the multiple effect of stress such as electric heating associating accelerated deterioration electricity-heat integration effect of stress under and electricity, heat, machinery aging at the electricity of the acceleration under the higher electric field effect of stress etc.Studies show that both at home and abroad, paper oil insulation is obviously different from ageing process under the simple stress in the ageing process under the multiple stress synergy.Under the actual motion condition, electric stress and thermal stress are general simultaneously to the effect of paper oil insulation, sustainable existence, and be difficult to avoid, therefore, it is generally acknowledged the paper oil insulation accelerated deterioration experiment ageing environment of analogue transformer Oil-Paper Insulation under the actual motion state preferably under the electric heating associating effect of stress, than the acceleration heat ageing under the simple stress or electricity aging can be more reasonable, Research on Oil Aging of Oil-paper Insulation in Oil process scientifically, assessment paper oil insulation residual life.Although some scholars have done many researchs for the aging characteristics of paper oil insulation under many effect of stress both at home and abroad, and some valuable paper oil insulation aging life-span models have been proposed, but, rarely have the aging physicochemical property of paper oil insulation under electric heating associating stress is carried out intensive research, main cause is exactly to carry out paper oil insulation aging test under the electric heating associating effect of stress to need reasonable in design, dependable performance, security of operation, the easily experimental provision of taking a sample, and this also is the difficult point of carrying out above-mentioned experiment.
Summary of the invention
The present invention is directed to and ubiquitously when simulated oil Aging of Oil-paper Insulation in Oil process testing in the existing experiment porch can not apply simultaneously the difficult problems such as electricity, heat integration effect of stress, sampling difficulty, elevated-temperature seal, aging experimental provision and the method for a kind of transformer oil paper insulated electrothermic associating stress proposed, it is simple in structure, result of use, security of operation, sampling is convenient.
For achieving the above object, the present invention adopts following technical scheme:
The aging experimental provision of a kind of transformer oil paper insulated electrothermic associating stress, it comprises exocoel, be provided with the inner chamber of at least one sealing in the exocoel, in inner chamber, be provided with proving installation, proving installation is provided with high-field electrode and low-field electrode, sample places between the high-field electrode and low-field electrode of mutual compression, and high-field electrode is connected with display system with current measurement with the high-voltage power supply of exocoel outside respectively.
Described proving installation comprises glass specimen bottle, it is installed on the outside support, in glass specimen bottle, fill transformer oil, in transformer oil, be provided with internal stent, internal stent is lifted on the outside support, is provided with low-field electrode in the internal stent bottom, and the low-field electrode top is provided with high-field electrode, high-field electrode is connected with the high-field electrode binding post, and the high-field electrode binding post is connected with the external high pressure power supply.
Described outside support comprises the stainless steel base plate, and it is connected with insulcrete by stainless steel bolt, and stainless steel steel bolt top is the protection ground electrode, and it is connected with the metallic walls of exocoel; Described internal stent comprises a pair of low-field electrode binding post, and they are installed on the insulcrete, and the bottom is connected with electrode-specimen test frame, is provided with holddown spring between low-field electrode and electrode-specimen test frame.
The top of described insulcrete bottom and stainless steel base plate is equipped with the nitrile rubber gasket seal.
The small-sized teflon sleeve of the outside suit of described low-field electrode binding post.
Described external high pressure power supply comprises that bushing is teflon sleeve, and it penetrates in the exocoel by steel flange; The top of bushing and bottom are provided with anti-corona cover, and conducting rod runs through whole bushing, are respectively equipped with terminals at bushing top and bottom, and the terminals of bottom are connected with the high-field electrode binding post by high-voltage conducting wires.
Described exocoel is high temperature oven, and adjustable temperature range is that room temperature+10 ~ 300 ℃, accuracy of temperature control are ± 0.5 ℃.
Described sample is oil-immersed insulating paper plate test product.
A kind of experimental technique of transformer oil paper insulated electrothermic associating accelerated deterioration, its step is:
1) oil-immersed insulating paper plate test product vacuum drying, immersion oil are processed;
2) ready oil-immersed insulating paper plate test product is inserted between high-field electrode and the low-field electrode and compression, then inner chamber is put into vacuum drying chamber, be evacuated to the black vacuum of 50 ± 5Pa, by an amount of transformer oil of fuel feeding valve oiling, take out inner chamber and carry out encapsulation process;
3) inner chamber is inserted exocoel and is connected wire, and the inner chamber of the good seal of some is evenly put into exocoel, and with high-field electrode, low-field electrode and protection ground electrode by the high temperature resistant wire correct wiring;
4) intensification, making alive carry out electric heating associating accelerated aging test, oil-immersed insulating paper plate test product 15 is applied electricity and thermal stress effect, the heating-up temperature of exocoel is set, high-field electrode is applied voltage, carry out the accelerated deterioration experiment of oil-immersed insulating paper plate test product under the electric heating associating stress;
5) take out inner chamber sample is carried out the physical and chemical parameter analysis, draw the aging rule of oil-immersed insulating paper plate under electric heating associating effect of stress.
In the described step 1), at first the cellulose insulation cardboard is placed in the vacuum drying oven, is evacuated to the black vacuum of 50 ± 5Pa, and temperature raise and remain on 110 ± 0.5 ℃, dry 48h; The sample of being down to after the room temperature drying takes out, the moisture absorption in air, observe simultaneously the variation of sample weight by precision balance, after reaching the micro-water content of setting, again put into vacuum drying chamber and be evacuated to the black vacuum of 50 ± 5Pa, temperature is increased to 50 ℃, then under this temperature insulating board is carried out vacuum oil immersion by the fuel feeding valve on the vacuum drying chamber.
Aging experimental provision under the transformer oil paper insulated electrothermic associating stress of the present invention; comprise that exocoel and inner chamber and the measurement and display system of the some that is placed on exocoel inside form; inner chamber is by the glass specimen bottle of tubular structure; be arranged at the interior electrode-sample structure of vial of tubular structure; be arranged at the insulcrete of tubular vial upper end; the stainless steel base plate of lower end; the stainless steel screw rod of connection and fixed insulation plate; the high-temperature resistant rubber pad that is arranged on insulcrete and the stainless steel base plate consists of; external voltage source is connected with the high-field electrode terminals of high-voltage connection with inner chamber upper end insulcrete by the bushing on the outer chamber; be connected on the high-field electrode of electrode-specimen test frame, the low-field electrode on electrode-specimen test frame and the protection ground electrode by high temperature wire respectively with the electric current that places the exocoel outside; voltage measurement is connected with outer cavity shell with display system.
Be arranged at the high-temperature resistant polytetrafluoroethylmelt bushing on exocoel top, be connected with the exocoel upper wall by flange, the conducting rod two ends have been provided with the anti-corona cover of semisphere stainless steel that prevents corona.
Exocoel is the high temperature constant temperature baking oven, and its adjustable temperature range is that room temperature+10 ~ 300 ℃, accuracy of temperature control are ± 0.5 ℃, and temperature uniformity＜2 ℃ have timing function, and interior space dimension is 1200 * 1000 * 1500mm.
The glass specimen bottle height of tubular structure is 135mm, and internal diameter 90mm, wall thickness are 5mm.
Electrode-the sample structure that is arranged in the tubular glass specimen bottle is made of high-field electrode, low-field electrode, paper oil insulation test product, and two electrodes are the brass material, and the edge all carries out rounding to be processed.
Bushing by teflon sleeve, conducting rod, binding post, anti-corona cover, and flange form, conducting rod is by two center pits that are hemispheric anti-corona cover, the two ends of conducting rod are and the binding post of input and output hi-line that teflon sleeve is connected with the upper wall of exocoel by flange.
Be provided with holddown spring on the guide rod of low-field electrode.
The insulcrete that is arranged at tubular vial upper end is the modified bismaleimide resin plate, and temperature resistant grade is the H level.
The experimental technique of a kind of transformer oil paper insulated electrothermic associating stress accelerated deterioration comprises the steps:
1) cellulose insulation cardboard vacuum drying sample pretreating, at first insulating board is cut into the disc-shaped of diameter 65mm, be placed in the vacuum drying oven, be evacuated to the black vacuum of 50 ± 5Pa, and temperature raise and remain on 110 ± 0.5 ℃, when obviously descending, vacuum tightness should again vacuumize, the insulating board test product is remained in the black vacuum of 50 ± 5Pa and carry out dry 48h, cardboard sample with drying after being down to room temperature takes out, the moisture absorption in air, observe simultaneously the variation of sample weight by precision balance, whether reach the micro-water content of setting;
2) insulating board is carried out vacuum oil immersion, ready insulating board is placed in the wide mouth glassware, then put into vacuum drying chamber, the rising temperature also remains on 50 ± 0.5 ℃, be evacuated to the black vacuum of 50 ± 5Pa, open the oiling valve on the vacuum drying chamber, insulating board is carried out vacuum oil immersion;
3) place sample and inner chamber oiling operation, the insulating board test product of abundant immersion oil is placed between high-field electrode and the low-field electrode, by being arranged on the spring compression on the low-field electrode, whole inner chamber is put into vacuum drying chamber carry out inner chamber oiling under the vacuum condition, inner chamber top stops oiling when keeping 1/5th remaining spaces, open vacuum drying chamber by screw-pressing up and down the insulcrete at two ends with bore seal;
4) according to planning experiment the inner chamber of finishing oiling and sealing of specified quantity is evenly inserted exocoel, and with respective electrode, wire, measurement and display device exact connect ion;
5) electric heating associating stress accelerated deterioration part arranges the heating-up temperature of high temperature oven according to the aging temperature of planning experiment, be horizontally disposed with supply voltage according to the electric field stress of planning experiment, accelerates electric heating associating senile experiment;
6) Real-Time Monitoring exocoel internal temperature changes in the experimentation, is applied to the voltage swing on the paper oil insulation test product, flows through the experimental datas such as size of current of test product;
7) different ageing step sample physical and chemical parameter analyses mainly are at different ageing step stopped heatings, remove and apply voltage, sample is cooled to room temperature, take out and also to open an inner chamber, extract transformer oil sample and insulating board test product and carry out in the oil correlation test such as gas detection, furfural content detection, the detection of the cardboard degree of polymerization and obtain concrete experimental data.
The invention has the beneficial effects as follows: it can realize the accelerated deterioration experiment of paper oil insulation test product under electric heating associating effect of stress, energy Real-Time Monitoring and the suffered thermal stress level of measurement sample, the size that applies voltage and flow through the electric current of test product, can regularly take a sample in the different ageing steps again, transformer oil is carried out relevant physico-chemical analysis with the insulating board test product, comprise insulating oil dielectric parameter in the ageing process, micro-water content, pH value, the parameters such as acid number change and the insulating board degree of polymerization, dielectric parameter, the variation of apparent pattern etc., obtain concrete experimental data, also can carry out simultaneously the single thermal stress accelerated deterioration experiment under electric heating associating accelerated deterioration experiment and the relevant temperature, to reach the purpose of comparative analysis, with the aging rule of research large-scale power transformer paper oil insulation material under different effect of stress conditions, be research transformer oil paper insulation system aging mechanism, the assessment ageing state provides experiment porch.
Description of drawings
Fig. 1 experimental provision of the present invention and measurement and display system global structure schematic diagram;
Fig. 2 inner-cavity structure master of the present invention looks schematic diagram;
Fig. 3 electrode of the present invention-sample structure schematic diagram (not comprising electrode-specimen test frame);
Fig. 4 high temperature high voltage resistant sleeve structure of the present invention schematic diagram;
Fig. 5 electric heating associating of the present invention accelerated deterioration experimental technique schematic flow sheet;
Dissolved acetylene gas curve in Fig. 6 the present invention oil test product of different ageing step;
Fig. 7 the present invention oil test product of different ageing step resistivity curve;
The different ageing step cardboard test product degree of polymerization curves of Fig. 8 the present invention.
Wherein, 1. exocoel, 2. inner chamber; 3. bushing, 4. high temperature resistant wire, 5. electric current; voltage measurement and display system; 6. protection ground electrode, 7. insulcrete, 8. nitrile rubber gasket seal; 9. stainless steel double-screw bolt, 10. glass specimen bottle, 11. stainless steel base plates; 12. transformer oil, 13. holddown springs, 14. low-field electrodes; 15. sample, 16. high-field electrodes, 17. low-field electrode binding posts; 18. the high-field electrode binding post, 19. terminals, 20. anti-corona covers; 21. conducting rod; 22. teflon sleeve, 23. steel flanges, 24. small-sized teflon sleeves; 25. electrode-specimen test frame, 26. high-voltage conducting wires.
Embodiment
The invention will be further described below in conjunction with accompanying drawing:
Fig. 1 is experimental provision overall construction drawing of the present invention, can find out among the figure that transformer oil paper insulated electrothermic associating accelerated deterioration experimental provision comprises that exocoel 1 and the inner chamber 2 that is arranged on exocoel 1 inside and voltage, current measurement and display system 5 form.
Inner chamber 2 is by the glass specimen bottle 10 of tubular structure, be arranged at the insulcrete 7 of tubular glass specimen bottle 10 upper ends, be arranged at the stainless steel base plate 11 of tubular glass specimen bottle 10 bottoms, the stainless steel screw rod 9 of connection and fixed insulation plate 7 and stainless steel base plate 11, be arranged at the resistant to elevated temperatures nitrile rubber gasket seal 8 of insulcrete 7 lower surfaces and stainless steel base plate 11 upper surfaces, being arranged at the electrode of tubular glass specimen bottle 10 inside-specimen test frame 25 consists of, electrode-specimen test frame 25 is by high-field electrode 16, low-field electrode 14 forms, sample 15 places between high-field electrode 16 and the low-field electrode 14, by placing the holddown spring 13 on the low-field electrode 14 that sample 15 is compressed, external voltage source is connected the high-field electrode binding post 18 on top through the high-voltage conducting wires 26 that connects bushing 3 lower end terminals 19 again by the bushing 3 on the outer chamber 1 and is connected with inner chamber, be connected at last on the high-field electrode 16 of electrode-specimen test frame 25, voltage on the high-field electrode 16 is through high-field electrode binding post 18, be connected to the electric current that is arranged at exocoel 1 outside through high temperature resistant wire 4, voltage measurement and display system 5, low-field electrode 14 on electrode-specimen test frame 25 is being connected to the electric current that is arranged at exocoel 1 outside by low-field electrode binding post 17 through high temperature resistant wire 4, voltage measurement and display system 5.
Fig. 2 is the inner-cavity structure schematic diagram of this experimental provision; can obviously find out among Fig. 2; electrode-specimen test frame 25 places tubular glass specimen bottle 10 inside; high-field electrode 16, sample 15 and low-field electrode 14 are immersed in the transformer oil 12 of injection fully; insulcrete 7 is connected with the stainless steel base plate by 9 connections of stainless steel double-screw bolt; the metal shell that protection ground electrode 6 is connected with exocoel connects, and by tension stainless steel double-screw bolt 9 and nitrile rubber gasket seal 8 inner chamber 2 is sealed.
Fig. 3 is electrode-specimen test shelf structure figure, can obviously find out, high-field electrode 16 is fixed on the insulcrete 7, and by nitrile rubber gasket seal 8 two parts are tightly connected, insulcrete 7 is the square of length of side 120mm, thickness is 10mm, low-field electrode 14 can be movable in the vertical direction, and make test product and two electrode close contacts by holddown spring 13, be provided with small-sized teflon sleeve 24 on the low-field electrode binding post 17, guarantee insulation between high-field electrode 16 and the low-field electrode binding post 17, small-sized teflon sleeve 24 external diameter 8mm, wall thickness 1mm, length 70mm, high-field electrode 16 and low-field electrode 14 are diameter 55mm, the brass material circular electrode of thickness 5mm, edge are done rounding and are processed.
Fig. 4 is high-temperature resistant polytetrafluoroethylmelt bushing 3 structural representations, for external high pressure being introduced the inside of exocoel 1, so that sample 15 is applied electric stress, exocoel 1 top arranges bushing 3, show among the figure, high-temperature resistant polytetrafluoroethylmelt bushing 3 is by the terminals 19 at conducting rod 21 two ends, hemispheric anti-corona cover 20, the conducting rod 21 of brass, teflon sleeve 22 and steel flange 23 consist of, conducting rod 21 external diameter 15mm, wall thickness 3mm, by the center pit of two anti-corona covers 20, teflon sleeve 22 maximum gauge 80mm, the steel flange 23 diameter 70mm of place, overall length 500mm, two ends outer wall are processed with full skirt to increase creepage distance.
Fig. 5 utilizes the present invention to carry out the schematic flow sheet of electric heating associating accelerated deterioration experiment.
Be the high temperature of realizing that electric heating associating accelerated deterioration needs, exocoel 1 is high temperature oven, adjustable temperature range is that room temperature+10 ~ 300 ℃, accuracy of temperature control are ± 0.5 ℃, interior space dimension is 1200 * 1000 * 1500mm, at least one inner chamber 2 can be inserted in the exocoel 1 when carrying out accelerated aging test, make transformer oil 12 and oil-immersed insulating paper plate test product (sample 15) under the high temperature of testing setting and electric stress, carry out accelerated deterioration.
For reach sealing, high temperature resistant and the insulation requirement, inner chamber uses internal diameter 90mm, wall thickness 5mm, the glass specimen bottle 10 of height 135mm is as container, modified bismaleimide resin plate take temperature resistant grade as the H level is insulcrete 7, take heatproof, oil resistance preferably nitrile rubber as gasket seal 8.Because transformer oil expands in the heating process, the problem that the inner chamber internal pressure increases, under the prerequisite that guarantees oil-immersed insulating paper plate test product, high-field electrode and the complete submergence of low-field electrode, must make container top stop at least 1/5th remaining space during oiling and offer the transformer oil expanded by heating.Can reliability service when not being higher than 160 ℃ through this experimental provision of verification experimental verification, satisfy the requirement of transformer oil immersion insulating board electric heating associating stress accelerated deterioration experiment.
In this experimental provision leadedly comprise high-voltage conducting wires 26, the wire that connects high-field electrode, low-field electrode and voltage, current measurement and display system all uses high temperature resistant wire 4, guarantees to unite in the accelerated aging test its insulating property at whole electric heating good.
The electric stress size that the difference that sample 15 compresses degree is born for test product and degree of uniformity, ageing environment have a significant effect, for making oil-immersed insulating paper plate sample 15 compression degree consistent, this experimental provision is fixed on high-field electrode 16 on the insulcrete 7, and design holddown spring on the guide rod of low-field electrode 14, guarantee that oil-immersed insulating paper plate test product 15 each compression degree in experiment is consistent, pressure is even.
Need to carry out at vacuum condition during inner chamber 2 oiling, could at utmost get rid of residual air between oil-immersed insulating paper plate sample 15 and high-field electrode 16 and the low-field electrode 14 like this, make each inner chamber oil-immersed insulating paper plate test product 15 have consistent aging stress and environment.This experimental provision inner chamber 2 can be put into vacuum drying chamber, whole inner chamber is extracted into the black vacuum of 50 ± 5 Pa by vacuum pump, and the fuel feeding valve that designs by vacuum drying chamber under this vacuum condition enters an amount of transformer oil 12 to the vacuum of inner chamber 2.
Owing to will study the oil immersion insulating board sample physicochemical property of 15 different ageing steps, a plurality of inner chambers 2 can be put into according to planning experiment in exocoel 1 inside, the digestion time that every process is certain is taken out an inner chamber 2, analyze wherein transformer oil and insulating board physicochemical property, to reach the purpose of continuing study oil-immersed insulating paper plate sample 15 aging rule under electric heating associating stress.
Electric heating associating accelerated deterioration experiment can be divided into the vacuum drying of insulating board sample, immersion oil is processed, place sample, oiling and closed cavity, inner chamber is inserted exocoel and is connected wire, intensification, making alive carry out electric heating associating accelerated aging test, and the taking-up inner chamber carries out physical and chemical parameter to sample and analyzes these steps.The vacuum drying of insulating board sample, immersion oil are processed and are referred to that the cellulose insulation cardboard carries out drying under vacuum condition, immersion oil is processed, at first the cellulose insulation cardboard is placed in the vacuum drying oven, be evacuated to the black vacuum of 50 ± 5Pa, and temperature raise and remain on 110 ± 0.5 ℃.Because the moisture of insulating board evaporation causes vacuum tightness to descend in the dry run, should again vacuumize if observe when vacuum tightness obviously descends, test product is remained in the black vacuum of 50 ± 5Pa and carry out dry 48h.The cardboard sample of being down to after the room temperature drying takes out, the moisture absorption in air, observe simultaneously the variation of sample weight by precision balance, after reaching the micro-water content of setting, again put into vacuum drying chamber and be evacuated to the black vacuum of 50 ± 5Pa, temperature is increased to 50 ℃, then under this temperature insulating board is carried out vacuum oil immersion by the fuel feeding valve on the vacuum drying chamber.Place sample, oiling and closed cavity part, at first ready oil-immersed insulating paper plate sample 15 is inserted between high-field electrode 16 and the low-field electrode 14 and compression, then inner chamber 2 is put into vacuum drying chamber, be evacuated to the black vacuum of 50 ± 5Pa, by an amount of transformer oil 12 of fuel feeding valve oiling, take out inner chamber 2 and carry out encapsulation process.Inner chamber is inserted exocoel and is connected conductor part and refers to the inner chamber 2 of the good seal of some is evenly put into exocoel 1, and with high-field electrode 16, low-field electrode 14 and protection ground electrode 6 by the high temperature resistant wire correct wiring.Intensification, making alive carry out electric heating associating accelerated aging test and refer to for oil-immersed insulating paper plate sample 15 is applied electricity and thermal stress effect, the heating-up temperature of exocoel 1 is set, high-field electrode 16 is applied voltage, carry out the accelerated deterioration experiment of oil-immersed insulating paper plate test product under the electric heating associating stress.The step of carrying out at last is to take out inner chamber sample is carried out the physical and chemical parameter analysis, with the aging rule of research oil immersion insulating board under electric heating associating effect of stress, transformer oil is analyzed oil dissolved gas, pH value, acid number, furfural content, Wei Shui, resistivity, voltage breakdown, dielectric loss etc., to the variation of the cellulose insulation cardboard Main Analysis degree of polymerization.
In process of the test of the present invention, the voltage that applies on the high-field electrode 16, the electric current that flows through oil-immersed insulating paper plate sample 15 can real-time online measuring, and pass through oscilloscope display, not need to realize suspending test, do not need to close high temperature oven and the parameters such as the electric current of continuous monitoring oil-immersed insulating paper plate test product, voltage change.
The present invention can apply electric stress and thermal stress simultaneously to oil-immersed insulating paper plate test product, realizes the accelerated deterioration experiment under electric heating associating stress; Can realize the sealing of high temperature lower inner cavity; Can realize regularly extracting sample, carry out the physical and chemical parameter analysis of transformer oil and insulating board sample; Can realize on-line real time monitoring experimentation China and foreign countries cavity temperature, test product voltage, the isoparametric variation of electric current; Low-field electrode arranges holddown spring makes oil-immersed insulating paper plate test product compress the degree consistent and uniform.
Accompanying drawing 6 is single thermal stress accelerated deterioration experiment dissolved acetylene content curve in different ageing step oil under the electric heating associating stress accelerated deterioration experiment oil-immersed insulating paper plate test product carried out take this experimental provision as platform and the relevant temperature.Experimental temperature is 130 ℃, and it is 4kV/mm that oil-immersed insulating paper plate test product bears electric stress, and curve 1 is the accelerated deterioration experimental result under 130 ℃ of the single thermal stress, and curve 2 is accelerated deterioration experimental result under the electric heating associating stress.As seen from the figure, under the electric heating associating effect of stress, compare under dissolved acetylene content and the single thermal stress in the oil, difference is changed significantly, along with the prolongation of digestion time, do not occur the acetylene gas of dissolving under the single thermal stress in the oil, and unite under the aging effect of stress at electric heating, dissolved acetylene gas increases sharply in the oil, and tends towards stability at aging later stage content.
Fig. 7 for single thermal stress accelerated deterioration experiment under the electric heating that oil-immersed insulating paper plate test product carried out take this experimental provision as platform associating stress accelerated deterioration experiment and the relevant temperature at different ageing step transformer oil specific insulation change curves.Curve 1 is the accelerated deterioration experimental result under 130 ℃ of the single thermal stress, and curve 2 is accelerated deterioration experimental result under the electric heating associating stress.As seen from the figure, under two kinds of aging stress conditions, the specific insulation of transformer oil all significantly reduces along with the prolongation of digestion time, and under two kinds of conditions, the specific insulation of transformer oil changes consistent, significantly not different, therefore can think that electric stress is less for the variable effect of volume of transformer resistivity.
Fig. 8 for single thermal stress accelerated deterioration experiment under the electric heating that oil-immersed insulating paper plate test product carried out take this experimental provision as platform associating stress accelerated deterioration experiment and the relevant temperature at different ageing step cellulose cardboard degree of polymerization change curves.Curve 1 is the accelerated deterioration experimental result under 130 ℃ of the single thermal stress, and curve 2 is accelerated deterioration experimental result under the electric heating associating stress.Can find out that electric stress is obvious to cellulose insulation cardboard degree of polymerization variation effect, under two kinds of aging ambient stresses, the insulating board degree of polymerization reduces along with the prolongation of digestion time, and that the existence of 4kV/mm electric field makes the insulating board degree of polymerization underspeed on the contrary is slack-off.
Claims (6)
1. a transformer oil paper insulated electrothermic is united the aging experimental provision of stress, it is characterized in that, it comprises exocoel (1), be provided with the inner chamber (2) of at least one sealing in the exocoel (1), in inner chamber (2), be provided with proving installation, proving installation is provided with high-field electrode (16) and low-field electrode (14), sample (15) places between the high-field electrode (16) and low-field electrode (14) of mutual compression, and high-field electrode (16) is connected voltage measurement and display system (5) with the outside high-voltage power supply of exocoel (1) respectively and is connected with electric current;
Wherein, inner chamber (2) is protection ground electrode (6), is arranged at the inner electrode of tubular glass specimen bottle (10)-specimen test frame (25) and consists of by the glass specimen bottle (10) of tubular structure, stainless steel screw rod (9), stainless steel steel bolt (9) top of insulcrete (7), the stainless steel base plate (11) that is arranged at tubular glass specimen bottle (10) bottom, connection and fixed insulation plate (7) and stainless steel base plate (11) that be arranged at tubular glass specimen bottle (10) upper end;
Described proving installation comprises: electrode-specimen test frame (25) places tubular glass specimen bottle (10) inside, high-field electrode (16), sample (15) and low-field electrode (14) are immersed in the transformer oil (12) of injection fully, insulcrete (7) is connected 11 with the stainless steel base plate) connect by stainless steel double-screw bolt (9), protection ground electrode (6) is connected 1 with exocoel) metallic walls connect, by straining stainless steel double-screw bolt (9) and nitrile rubber gasket seal (8) inner chamber (2) is sealed; External voltage source is connected with high-field electrode binding post (18), be connected at last on the high-field electrode (16) of electrode-specimen test frame (25), voltage on the high-field electrode (16) is through high-field electrode binding post (18), pass through again high temperature resistant wire (4) and be connected to the electric current that is arranged at exocoel (1) outside, voltage measurement and display system (5), low-field electrode (14) on electrode-specimen test frame (25) passes through high temperature resistant wire (4) again and is connected to the electric current that is arranged at exocoel (1) outside by low-field electrode binding post (17), voltage measurement and display system (5);
A pair of low-field electrode binding post (17), they are installed on the insulcrete (7), and the bottom is connected with electrode-specimen test frame (25);
Electrode-specimen test frame (25) is comprised of high-field electrode (16), low-field electrode (14), sample (15) places between high-field electrode (16) and the low-field electrode (14), by placing the holddown spring (13) on the low-field electrode (14) sample (15) is compressed.
2. the aging experimental provision of transformer oil paper insulated electrothermic associating stress as claimed in claim 1 is characterized in that, the top of described insulcrete (7) bottom and stainless steel base plate (11) is equipped with nitrile rubber gasket seal (8).
3. the aging experimental provision of transformer oil paper insulated electrothermic associating stress as claimed in claim 1 is characterized in that, the outside suit of described low-field electrode binding post (17) small-sized teflon sleeve (24).
4. transformer oil paper insulated electrothermic as claimed in claim 1 is united the aging experimental provision of stress, it is characterized in that, described external high pressure power supply comprises that bushing (3) is teflon sleeve (22), and it penetrates in the exocoel (1) by steel flange (23); The top of bushing (3) and bottom are provided with anti-corona cover (20), conducting rod (21) runs through whole bushing (3), be respectively equipped with terminals (19) at bushing (3) top and bottom, the terminals of bottom (19) are connected with high-field electrode binding post (18) by high-voltage conducting wires (26).
5. the aging experimental provision of transformer oil paper insulated electrothermic as claimed in claim 1 associating stress is characterized in that, described exocoel (1) is high temperature oven, and adjustable temperature range is that room temperature+10 ~ 300 ℃, accuracy of temperature control are ± 0.5 ℃.
6. the aging experimental provision of transformer oil paper insulated electrothermic associating stress as claimed in claim 1 is characterized in that, described sample (15) is oil-immersed insulating paper plate test product.
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