CN103105568A - Transformer paper oil insulation experiment device integrated with electric heating combination ageing and partial discharge - Google Patents
Transformer paper oil insulation experiment device integrated with electric heating combination ageing and partial discharge Download PDFInfo
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- CN103105568A CN103105568A CN2013100160985A CN201310016098A CN103105568A CN 103105568 A CN103105568 A CN 103105568A CN 2013100160985 A CN2013100160985 A CN 2013100160985A CN 201310016098 A CN201310016098 A CN 201310016098A CN 103105568 A CN103105568 A CN 103105568A
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Abstract
The invention provides a transformer paper oil insulation experiment device integrated with electric heating combination ageing and partial discharge, and provides a corresponding experiment method. The experiment device comprises a high voltage portion, a low voltage portion and a sealing tank portion. The device can provide a platform of electric heating combination ageing and partial discharge experiments for a transformer paper oil insulation defect model, and can provide experiments of corona discharge, creeping discharge and air-gap discharge models in oil. The device has good air-tight performance, and can be isolated from external air and other influences. The whole system self cannot produce partial discharge, and the device cannot produce rust and other impurities in the partial discharge, can guarantee reliability of the partial discharge, and is simple in structure, convenient to operate, and capable of achieving good test effects.
Description
Technical field
The present invention relates to insulation of electrical installation on-line monitoring and fault diagnosis field, particularly a kind of transformer oil paper insulated electrothermic aging and local discharge integrated experimental provision of associating and test method.
Background technology
The major accident of transformer can interrupt electric power supply, causes huge economic loss, and the transformer fault that is caused by interior Insulation Problems occupies pith.Transformer oil and oil-impregnated paper insulation are the chief components of insulation in transformer, both are subject to electricity, heat, machinery and the factor impact such as chemical and occur aging in During Process of Long-term Operation, cause transformer insulated hydraulic performance decline, even cause transformer major insulation or minor insulation fault.
In order to study the aging rule of transformer Oil-Paper Insulation, the normal method of accelerated aging test that adopts is studied at present.But common is mainly under excessive temperature acceleration heat ageing and the acceleration electricity under higher electric field are aging, but under physical condition, paper oil insulation bears electric stress and thermal stress simultaneously, therefore the transformer Oil-Paper Insulation is carried out that the electric heating associating is aging can simulate the service condition of real transformer better, than the aging test under simple stress more science with rationally.
Chemical diagnosis is to assess at present the main method of oil paper insulation ageing state both at home and abroad, comprises acid number and little water gaging etc. in furans (Furan) derivative content detection in dissolved gas analysis (DGA), oil, degree of polymerization DP and tensile strength TS measurement, oil.But it is aging that these methods all exist the oil dissolved gas of certain deficiency: DGA not only can derive from paper, and oil also can produce various gases in ageing process; Furan derivatives is the special outcome in the cellulose ageing process, but its concentration can be subject to the impact of thermosyphon and oil strain; DP and TS need off-line to hang cover to measure, and get the result that paper position difference obtains and differ larger; In oil, acid number and micro-water content have important impact to ageing process, but and there is no obvious correlativity between ageing state.Therefore, the inherent shortcoming of traditional diagnosis method makes it no longer practical, and the fast development of electric system can overcome the online evaluation method of the Research on Power Transformer Oil-paper Insulation ageing state of traditional chemical method deficiency in the urgent need to research.And shelf depreciation is a kind of harmless on-line monitoring, and multinomial result of study both domestic and external shows that some characteristic quantity of shelf depreciation can reflect the insulation characterisitic of different ageing steps to a certain extent.
Summary of the invention
In view of this, technical matters to be solved by this invention is to provide a kind of transformer oil paper insulated electrothermic aging and local discharge integrated experimental provision of associating and test method.
One of purpose of the present invention is to propose the aging and local discharge integrated experimental provision of a kind of transformer oil paper insulated electrothermic associating; Two of purpose of the present invention is to propose the aging and local discharge integrated test method of a kind of transformer oil paper insulation defect model electric heating associating.
One of purpose of the present invention is achieved through the following technical solutions:
Aging and the local discharge integrated experimental provision of a kind of transformer oil paper insulated electrothermic associating provided by the invention comprises high-pressure section, low-pressure section and sealable tank part;
Described high-pressure section is used for providing high-voltage power supply and high-field electrode;
Described sealable tank part is used for providing aging and container shelf depreciation, and guarantees impermeability;
Described low-pressure section is for the placement platform that low-field electrode and oilpaper defect model are provided.
Further, described sealable tank partly comprises sealed shell of tank, gland bonnet, sealing gasket and holding screw;
Be provided with sealing gasket between described sealed shell of tank and gland bonnet, be provided with between described sealed shell of tank and gland bonnet for fastening screw; Described low-pressure section is arranged at sealed shell of tank inside;
Described high-pressure section runs through and is arranged at gland bonnet central authorities, and it is inner close with low-pressure section that described high-pressure section one end is placed in sealed shell of tank, and the other end is exposed to the sealed shell of tank outside.
Further, described high-pressure section comprises high-pressure conduit, high-field electrode bar, high-field electrode, the anti-corona cover of high pressure;
Described high-pressure conduit runs through and is arranged at high pressure and covers, described high-field electrode bar runs through and is arranged at high-pressure conduit inside, the end that described high-field electrode bar is exposed to the pressure pan external body is provided with the anti-corona cover of high pressure, and the end that described high-field electrode bar stretches into the high pressure tank interior is provided with high-field electrode.
Further, described low-pressure section comprises low pressure plate electrode, cardboard fixed support, plate electrode fixed screw, cardboard and cardboard pressure strip; Described cardboard fixed support is arranged on the high pressure inner tank wall, is provided with low pressure plate electrode on described cardboard fixed support; Described cardboard fixed support is connected with the high pressure tank body by the plate electrode fixed screw, and described cardboard is arranged at above low pressure plate electrode, also is provided with the cardboard pressure strip on described cardboard; The extreme low pressure plate electrode near low-pressure section of the high-tension electricity of described high-pressure section.
Further, described high-field electrode is a kind of in high voltage needle electrode, post electrode or the ball electrode of being done by copper; Described high-field electrode with adopt the epoxide-resin glue sealing between high-pressure conduit contacts.
Further, described high-pressure conduit and gland bonnet contact position are tapered, and screw with the conduit holding screw; The waterline groove is carved with in the position that seals between described gland bonnet and sealed shell of tank.
Further, can pass through the screw thread installation and removal between described high-field electrode and high-field electrode bar.
Further, also be provided with gas valve on described high pressure tank body.
Two of purpose of the present invention is achieved through the following technical solutions:
Aging and the local discharge integrated test method of a kind of transformer oil paper insulation defect model electric heating associating provided by the invention comprises the following steps:
S1: dry transformer oil and insulating paper;
S2: the oil that pre-service is good and oilpaper are put into electric heating associating aging equipment, and the oil groove of this device being put into constant temperature carries out oil bath;
S3: connecting circuit, aging equipment is applied high pressure, carry out electric heating associating burn-in test.
Further, in described step S1, dry run is specific as follows: at first with paper in 90 ℃/50Pa environment dry 48 hours, then paper is put into oil dry 48 hours of 90 ℃/50Pa environment;
In described step S2, the oil bath process is specific as follows: at first that pre-service is good oil is poured in electric heating associating aging equipment, cardboard is placed on above low pressure plate electrode, cover gland bonnet, screw holding screw, utilize gas valve device to be vacuumized and passes into nitrogen, then the oil groove of whole device being put into constant temperature carries out oil bath, controls the height of the oil in oil groove to the position of gas valve, and the effect of device being put into oil groove is guarantee the heat ageing temperature constant;
In described step S3, electric heating associating burn-in test process is specific as follows: connecting circuit at first, then aging equipment is applied high pressure, gather the voltage of shelf depreciation, until discharge stability and after carrying out the operating frequency phase correction, utilize at last digital oscilloscope to gather the shelf depreciation raw data to each test product.
The invention has the advantages that: the invention provides a kind of transformer oil paper insulated electrothermic aging and local discharge integrated experimental provision of associating and corresponding test method.This device can provide the electric heating associating aging and partial discharge test platform for transformer oil paper insulation defect model.Device can provide the test of corona discharge in oil, creeping discharge and bubble-discharge model.Experimental provision has good impermeability, can completely cut off the impact of outside air etc.Whole system self does not produce shelf depreciation, and the impurity such as corrosion that device can the office of exerting an influence not be put can guarantee the reliability of local discharge test.Apparatus structure is simple, and is easy to operate, can obtain good test effect.The advantage of this device is specific as follows:
1. can carry out the electric heating associating to the paper oil insulation defect model aging, and simultaneously the local discharge signal of defect model in ageing process be tested;
2. impermeability is good, can completely cut off the impact of moisture etc. in outside air, and the infiltration of oil can prevent oil bath the time;
3. high-pressure conduit can bear high voltage, and whole system can be born 30kV voltage; Whole system is without office's place system, when there is no insulation defect, do not have the shelf depreciation such as corona to produce when high pressure bears in system, the local discharge signal that therefore records all derives from the defective of paper oil insulation, collection to local discharge signal have reliability;
4. the material of whole tank body employing is stainless steel, is difficult for producing corrosion, thereby can bring the impurity such as corrosion by the oil supply paper system;
5. device can be realized the test of polytype discharge defect model, comprises corona discharge in oil, creeping discharge and bubble-discharge model.
Other advantage of the present invention, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on being apparent to those skilled in the art to investigating hereinafter, perhaps can be instructed from the practice of the present invention.The objectives and other advantages of the present invention can realize and obtain by specifically noted structure in following instructions and accompanying drawing.
Description of drawings
In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing, wherein:
Fig. 1 is transformer oil paper insulated electrothermic associating ageing test apparatus;
Fig. 2 is high voltage needle electrode/post electrode/ball electrode;
Fig. 3 is gland bonnet and waterline groove thereof;
Fig. 4 is the wiring of local discharge test platform;
Fig. 5 is corona discharge defect model electric heating associating aging equipment;
Fig. 6 is the PRPD collection of illustrative plates of the aging lower 24kV corona discharge of electric heating associating;
Fig. 7 is creeping discharge defect model electric heating associating aging equipment;
Fig. 8 is the PRPD collection of illustrative plates of the aging lower 23kV creeping discharge of electric heating associating;
Fig. 9 is bubble-discharge defect model electric heating associating aging equipment;
Figure 10 is the PRPD collection of illustrative plates of the aging lower 7kV bubble-discharge of electric heating associating.
Embodiment
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail; Should be appreciated that preferred embodiment only for the present invention is described, rather than in order to limit protection scope of the present invention.
Embodiment 1
Fig. 1 is transformer oil paper insulated electrothermic associating ageing test apparatus; Fig. 2 is high voltage needle electrode/post electrode/ball electrode; Fig. 3 is gland bonnet and waterline groove thereof; Fig. 4 is the wiring of local discharge test platform; Fig. 5 is corona discharge defect model electric heating associating aging equipment; Fig. 6 is the PRPD collection of illustrative plates of the aging lower 24kV corona discharge of electric heating associating; Fig. 7 is creeping discharge defect model electric heating associating aging equipment; Fig. 8 is the PRPD collection of illustrative plates of the aging lower 23kV creeping discharge of electric heating associating; Fig. 9 is bubble-discharge defect model electric heating associating aging equipment; Figure 10 is the PRPD collection of illustrative plates of the aging lower 7kV bubble-discharge of electric heating associating, and as shown in the figure: the aging and local discharge integrated experimental provision of a kind of transformer oil paper insulated electrothermic associating provided by the invention comprises high-pressure section, low-pressure section and sealable tank part;
Described high-pressure section is used for providing high-voltage power supply and high-field electrode;
Described sealable tank part is used for providing aging and container shelf depreciation, and guarantees impermeability;
Described low-pressure section, be used for providing the placement platform of low-field electrode and oilpaper defect model, described high-pressure section is arranged at the top of sealable tank part and is fixed on the lid of sealable tank part, described low-pressure section is arranged at the bottom in sealable tank partial interior space, and described high-pressure section is near low-pressure section.
Described sealable tank partly comprises sealed shell of tank, gland bonnet, sealing gasket and holding screw;
Be provided with sealing gasket between described sealed shell of tank and gland bonnet, be provided with between described sealed shell of tank and gland bonnet for fastening screw; Described low-pressure section is arranged at sealed shell of tank inside;
Described high-pressure section runs through and is arranged at gland bonnet central authorities, and it is inner close with low-pressure section that described high-pressure section one end is placed in sealed shell of tank, and the other end is exposed to the sealed shell of tank outside.
Described high-pressure section comprises high-pressure conduit, high-field electrode bar, high-field electrode, the anti-corona cover of high pressure;
Described high-pressure conduit runs through and is arranged at high pressure and covers, described high-field electrode bar runs through and is arranged at high-pressure conduit inside, the end that described high-field electrode bar is exposed to the pressure pan external body is provided with the anti-corona cover of high pressure, and the end that described high-field electrode bar stretches into the high pressure tank interior is provided with high-field electrode.
Described low-pressure section comprises low pressure plate electrode, cardboard fixed support, plate electrode fixed screw, cardboard and cardboard pressure strip; Described cardboard fixed support is arranged on the high pressure inner tank wall, is provided with low pressure plate electrode on described cardboard fixed support; Described cardboard fixed support is connected with the high pressure tank body by the plate electrode fixed screw, and described cardboard is arranged at above low pressure plate electrode, also is provided with the cardboard pressure strip on described cardboard; The extreme low pressure plate electrode near low-pressure section of the high-tension electricity of described high-pressure section.
Described high-field electrode is a kind of in high voltage needle electrode, post electrode or the ball electrode of being done by copper; Described high-field electrode with adopt the epoxide-resin glue sealing between high-pressure conduit contacts.
Described high-pressure conduit and gland bonnet contact position are tapered, and screw with the conduit holding screw; The waterline groove is carved with in the position that seals between described gland bonnet and sealed shell of tank.
Can pass through the screw thread installation and removal between described high-field electrode and high-field electrode bar.
Also be provided with gas valve on described high pressure tank body.
The embodiment of the present invention also provides a kind of transformer oil paper insulation defect model electric heating associating aging and local discharge integrated test method, comprises the following steps:
S1: dry transformer oilpaper;
S2: the oil that pre-service is good and oilpaper are put into electric heating associating aging equipment, and the oil groove of this device being put into constant temperature carries out oil bath;
S3: connecting circuit, aging equipment is applied high pressure, carry out electric heating associating burn-in test.
In described step S1, dry run is specific as follows: at first with paper in 90 ℃/50Pa environment dry 48 hours, then paper is put into oil dry 48 hours of 90 ℃/50Pa environment;
In described step S2, the oil bath process is specific as follows: at first that pre-service is good oil is poured in electric heating associating aging equipment, cardboard is placed on above low pressure plate electrode, cover gland bonnet, screw holding screw, utilize gas valve device to be vacuumized and passes into nitrogen, then the oil groove of whole device being put into constant temperature carries out oil bath, controls the height of the oil in oil groove to the position of gas valve, and the effect of device being put into oil groove is guarantee the heat ageing temperature constant;
In described step S3, electric heating associating burn-in test process is specific as follows: connecting circuit at first, then aging equipment is applied high pressure, gather the voltage of shelf depreciation, until discharge stability and after carrying out the operating frequency phase correction, utilize at last digital oscilloscope to gather the shelf depreciation raw data to each test product.
Embodiment 2
The difference of the present embodiment and embodiment 1 only is:
Referring to Fig. 1, the transformer oil paper insulation defect model electric heating of this preferred embodiment associating aging test and local discharge integrated test unit, referred to as ageing can, it comprises high-pressure section, low-pressure section and sealable tank part.
Described high-pressure section comprises that material is the high voltage needle electrode that high-voltage corona cover 1, high pressure copper electrode bar 2, the material of copper is the high-pressure conduit 3 of teflon, sealing gasket 8 that material is teflon, material is copper/post electrode/ball electrode 10;
Described sealable tank comprises that partly material is that stainless sealed shell of tank 8, material are that stainless gland bonnet 6, material are that sealing gasket 7, the material of teflon is that stainless gas valve 9, material are that stainless holding screw 4 is stainless conduit holding screw 5 with material;
Described low-pressure section comprises that material is that low pressure plate electrode 13, the material of copper is that stainless plate electrode fixed screw 15, cardboard 12, material are the cardboard pressure strip 11 of thick wood and the cardboard fixed support 14 that material is thick wood.
The ageing can device is described as follows:
Fig. 1 is the sectional view of ageing can, and whole ageing can is cylindric, and high-field electrode bar 2, high voltage needle electrode/post electrode/ball electrode 10 and low pressure plate electrode 13 are positioned at the geometric center of ageing can, to guarantee the even of electric field.
High pressure copper electrode 2 seals with epoxide-resin glue with the gap that high-pressure conduit 3 contacts, and with isolated outside air impact, guarantees the impermeability of ageing can.
It is local tapered that high-pressure conduit 3 contacts with gland bonnet 6, and firmly screw with conduit holding screw 5, to guarantee the impermeability of ageing can.
High-pressure conduit 3 arranges enough creepage distances, guarantees 30kV and following creeping discharge and the edge flashing of not occuring, and guarantees that the ageing can system does not introduce shelf depreciation.
Can pass through the screw thread installation and removal between high voltage needle electrode/plate electrode/ball electrode 10 and high-field electrode bar 2, can form respectively different shelf depreciation artificial models: pin electrode 101, cardboard 12 and low pressure plate electrode 13 can consist of the needle plate model of corona discharge in oil; Plate electrode 102, cardboard 12 can consist of the creeping discharge model with low pressure plate electrode 13; And ball electrode 103, artificial bonding cardboard air gap 12 can be used for simulation bubble-discharge model with low pressure plate electrode 13.
Between gland bonnet 6 and sealed shell of tank 8, the waterline groove is carved with in the position of sealing, to guarantee the sealing property of ageing can.
The effect of gas valve 9 is to provide unique interface in ageing can and the external world, can use vacuum pump that the tank Air is extracted out, forms vacuum environment; Also can pass into drying nitrogen by this valve, with the impact of isolated outside air.In addition, because whole tank body is same current potential, this valve can be used as the junction of ground wire.
The part of low-pressure section as mentioned above.During installation, at first place the cardboard fixed mount, will hang down pressure plate electrode and be fixed on the plate electrode fixed screw, put the local discharge test cardboard, then place cardboard pressure strip 11, and fastening with insulating screw.The effect of cardboard fixed mount 14 is that fixedly the position of cardboard 12, just can put in cardboard and still can not move left and right.Cardboard fixed mount and cardboard pressure strip can guarantee the consistance of each sample placement location, guarantee the repeatability of experiment, can guarantee simultaneously in discharge process that cardboard can not move causes in oil barrier action to suddenly disappear causing flashover, burn out experiment porch and detect oscillograph.
With reference to Fig. 2, high voltage needle electrode 101, high-pressure column electrode 102 and smash electrode 103 guarantee symmetry how much with reference to international standard;
With reference to Fig. 3, gland bonnet 6 is provided with four holding screw holes, and gland bonnet 6 contacts the place and is carved with two circle waterline grooves with sealed shell of tank 8, and waterline groove and sealing gasket coordinate the impermeability that can guarantee ageing can.
The experimental technique of a kind of transformer oil paper insulated electrothermic associating accelerated deterioration and shelf depreciation, its step is:
1) simulation real transformer oilpaper and processing procedure with paper in 90 ℃/50Pa environment dry 48 hours, then put into paper new transformer oil dry 48 hours of 90 ℃/50Pa environment;
2) oil that pre-service is good is poured in electric heating associating aging equipment, cardboard is placed on above low pressure plate electrode 13, cover gland bonnet 6, screw holding screw 4, utilize 9 pairs of devices of gas valve to vacuumize and pass into nitrogen, then the oil groove of whole device being put into constant temperature carries out oil bath, controls the height of the oil in oil groove to the position of gas valve 9, and the effect of device being put into oil groove is guarantee the heat ageing temperature constant;
3) according to Fig. 4 connecting circuit figure, aging equipment is applied high pressure, carry out the electric heating associating aging, the voltage of test collection shelf depreciation is chosen as 1.2 times of firing potential, and keep 10min under this voltage, until discharge stability and after carrying out the operating frequency phase correction, utilize the Wavepro7100 digital oscilloscope each test product to be gathered the shelf depreciation raw data of 2000 power frequency periods, then gathered once every 12 hours.
With reference to Fig. 4, be with the Partial Discharge Measurement System of electric heating associating aging equipment as test product as shown in the figure.Aging equipment is positioned in the adjustable thermostatic oil bath of temperature 16; system provides power supply by 380V low-tension supply 17; halo-free HT testing transformer 18 by 50kVA/50kV rises to high pressure; use 19 pairs of test units of protection water resistance of 5k Ω to protect; the high-voltage power voltage that capacitive divider 21 is recorded transfers to oscillograph 23 passages 2; the current signal that shelf depreciation produces is detected by pulses of current sensor 24, transfers to channel oscilloscope 1 with concentric cable after amplifying via amplifier 22.Testing transformer to test product with to the high-voltage connection of voltage divider, shielding line 20 is set, eliminate the corona signal that high-voltage connection produces, avoid affecting the measurement that test product office puts.
Embodiment 3
The difference of the present embodiment and embodiment 2 only is:
Use the present invention to carry out the aging and partial discharge test of corona discharge defect model electric heating associating.Select 25# common transformer oil and the thick common insulating board of 1mm as test material, cardboard is carried out cutting according to diameter 80mm.According to preceding method, oil and paper are carried out pre-service, cardboard is placed on above low pressure plate electrode 13, the distance of adjusting between pin electrode and cardboard is 1mm, as shown in Figure 5.Cover gland bonnet 6, screw holding screw 4, utilize 9 pairs of devices of gas valve to be evacuated down to 50Pa, pass into nitrogen, the oil groove of then whole device being put into constant temperature carries out oil bath, and it is 90 degree that oil bath temperature is set.The corona discharge firing potential is 12kV, keeps 10min under 18kV, gathers 2000 power frequency periods after discharge stability, then gathers once every 12 hours.Be illustrated in figure 6 as the impulse phase distribution collection of illustrative plates (PRPD) of the aging lower 24kV corona discharge of electric heating associating.
Embodiment 4
The difference of the present embodiment and embodiment 2 only is:
Use the present invention to carry out the aging and partial discharge test of creeping discharge defect model electric heating associating.By shown in Figure 7, it is 25mm that high-field electrode adopts diameter, is highly the post electrode of 25mm, and placing diameter on low-field electrode is the oil immersion cardboard of 80mm, and the post electrode is pressed on cardboard.It is 90 degrees centigrade that oil bath temperature is set, and the creeping discharge starting potential is 19kV, keeps 10min under 23kV, gathers 2000 fair cycles after discharge stability, then gathers once every 12 hours.Be illustrated in figure 6 as the impulse phase distribution collection of illustrative plates (PRPD) of the aging lower 23kV creeping discharge of electric heating associating.
Embodiment 5
The difference of the present embodiment and embodiment 2 only is:
Use the present invention to carry out the aging and partial discharge test of bubble-discharge defect model electric heating associating.By shown in Figure 9, it is the ball electrode of 5.6mm that high-field electrode adopts diameter, places artificial bonding air gap model on low-field electrode, and void dimension is diameter 2mm height 0.5mm, and the post electrode is pressed on cardboard.It is 90 degree that oil bath temperature is set, and the bubble-discharge starting potential is 5kV, keeps 10min under 7kV, gathers 2000 fair cycles after discharge stability, then gathers once every 12 hours.Unite as shown in figure 10 the PRPD collection of illustrative plates of aging lower 7kV bubble-discharge for electric heating.
The above is only the preferred embodiments of the present invention, is not limited to the present invention, and obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of claim of the present invention and equivalent technologies thereof, the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. the aging and local discharge integrated experimental provision of transformer oil paper insulated electrothermic associating, is characterized in that: comprise high-pressure section, low-pressure section and sealable tank part;
Described high-pressure section is used for providing high-voltage power supply and high-field electrode;
Described sealable tank part is used for providing aging and container shelf depreciation, and guarantees impermeability;
Described low-pressure section is for the placement platform that low-field electrode and oilpaper defect model are provided.
2. transformer oil paper insulated electrothermic according to claim 1 is united aging and local discharge integrated experimental provision, and it is characterized in that: described sealable tank partly comprises sealed shell of tank, gland bonnet, sealing gasket and holding screw;
Be provided with sealing gasket between described sealed shell of tank and gland bonnet, be provided with between described sealed shell of tank and gland bonnet for fastening screw; Described low-pressure section is arranged at sealed shell of tank inside;
Described high-pressure section runs through and is arranged at gland bonnet central authorities, and it is inner close with low-pressure section that described high-pressure section one end is placed in sealed shell of tank, and the other end is exposed to the sealed shell of tank outside.
3. transformer oil paper insulated electrothermic according to claim 1 is united aging and local discharge integrated experimental provision, and it is characterized in that: described high-pressure section comprises high-pressure conduit, high-field electrode bar, high-field electrode, the anti-corona cover of high pressure;
Described high-pressure conduit runs through and is arranged at high pressure and covers, described high-field electrode bar runs through and is arranged at high-pressure conduit inside, the end that described high-field electrode bar is exposed to the pressure pan external body is provided with the anti-corona cover of high pressure, and the end that described high-field electrode bar stretches into the high pressure tank interior is provided with high-field electrode.
4. transformer oil paper insulated electrothermic according to claim 1 is united aging and local discharge integrated experimental provision, and it is characterized in that: described low-pressure section comprises low pressure plate electrode, cardboard fixed support, plate electrode fixed screw, cardboard and cardboard pressure strip; Described cardboard fixed support is arranged on the high pressure inner tank wall, is provided with low pressure plate electrode on described cardboard fixed support; Described cardboard fixed support is connected with the high pressure tank body by the plate electrode fixed screw, and described cardboard is arranged at above low pressure plate electrode, also is provided with the cardboard pressure strip on described cardboard; The extreme low pressure plate electrode near low-pressure section of the high-tension electricity of described high-pressure section.
5. aging and the local discharge integrated experimental provision of transformer oil paper insulated electrothermic according to claim 1 associating is characterized in that: a kind of for by in high voltage needle electrode, post electrode or the ball electrode of copper work of described high-field electrode; Described high-field electrode with adopt the epoxide-resin glue sealing between high-pressure conduit contacts.
6. transformer oil paper insulated electrothermic according to claim 1 is united aging and local discharge integrated experimental provision, and it is characterized in that: described high-pressure conduit and gland bonnet contact position are tapered, and screw with the conduit holding screw; The waterline groove is carved with in the position that seals between described gland bonnet and sealed shell of tank.
7. the aging and local discharge integrated experimental provision of transformer oil paper insulated electrothermic associating according to claim 1, is characterized in that: can pass through the screw thread installation and removal between described high-field electrode and high-field electrode bar.
8. the aging and local discharge integrated experimental provision of transformer oil paper insulated electrothermic associating according to claim 1, is characterized in that: also be provided with gas valve on described high pressure tank body.
9. a transformer oil paper insulation defect model electric heating is united aging and local discharge integrated test method, it is characterized in that: comprise the following steps:
S1: dry transformer oilpaper;
S2: the oil that pre-service is good and oilpaper are put into electric heating associating aging equipment, and the oil groove of this device being put into constant temperature carries out oil bath;
S3: connecting circuit, aging equipment is applied high pressure, carry out electric heating associating burn-in test.
10. transformer oil paper insulation defect model electric heating according to claim 1 is united aging and local discharge integrated test method, and it is characterized in that: in described step S1, dry run is specific as follows:
At first with paper in 90 ℃/50Pa environment dry 48 hours, then paper is put into oil dry 48 hours of 90 ℃/50Pa environment;
In described step S2, the oil bath process is specific as follows: at first that pre-service is good oil is poured in electric heating associating aging equipment, cardboard is placed on above low pressure plate electrode, cover gland bonnet, screw holding screw, utilize gas valve device to be vacuumized and passes into nitrogen, the oil groove of then whole device being put into constant temperature carries out oil bath, controls the height of the oil in oil groove, guarantee lower than gas valve, the effect of device being put into oil groove is guarantee the heat ageing temperature constant;
In described step S3, electric heating associating burn-in test process is specific as follows: connecting circuit at first, then aging equipment is applied high pressure, voltage is risen to 1.2 times of firing potential, until discharge stability and after carrying out the operating frequency phase correction, utilize digital oscilloscope to gather local discharge signal to each test product.
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