CN201993436U - High-voltage oiled paper insulation characteristic testing device - Google Patents
High-voltage oiled paper insulation characteristic testing device Download PDFInfo
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- CN201993436U CN201993436U CN2010205338473U CN201020533847U CN201993436U CN 201993436 U CN201993436 U CN 201993436U CN 2010205338473 U CN2010205338473 U CN 2010205338473U CN 201020533847 U CN201020533847 U CN 201020533847U CN 201993436 U CN201993436 U CN 201993436U
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Abstract
The utility model relates to the technical field of high voltage and insulation, in particular to a high-voltage oiled paper insulation characteristic testing device. The testing device comprises a high-voltage guide rod placed in an oil drum, an epoxy resin cover plate, a vertical orientation ring, an acid-resisting core rod, a high-voltage electrode, a test object and a grounding electrode, wherein the side wall of the oil drum is provided with an oil inlet and an oil outlet; the testing device is characterized in that the vertical orientation ring is fixed on the epoxy resin cover plate; the upper part of the high-voltage guide rod is fixed on the epoxy resin cover plate through the vertical orientation ring, and the high-voltage guide rod is vertical to the epoxy resin cover plate; the lower part of the high-voltage guide rod is provided with the high-voltage electrode; the upper part of the acid-resisting core rod is fixed on the epoxy resin cover plate, and the lower part thereof is fixed on the grounding electrode; and the test object is placed on the grounding electrode. The testing device can realize grounding electrode oil/oiled paper insulation test under direct voltage, alternating voltage and combined voltage, and further can obtain the partial discharge property and breakdown property of the major insulation of a converter transformer.
Description
Technical field
The utility model relates to the high voltage and insulation technology field, is specifically related to a kind of hydraulic oil paper insulation characteristic test apparatus.
Background technology
Along with China's DC line increase and ± construction of 800kV DC transmission engineering, the research project relevant with direct current more and more receives publicity.Existing engineering experience and statistics show: in the HVDC (High Voltage Direct Current) transmission system, the Insulation Problems of numerous crucial primary equipments such as converter power transformer, sleeve pipe is the restriction design and causes the topmost factor of field accident.WG B4.04 working group of CIGRE high voltage direct current subcommittee statistics shows: the HVDC (High Voltage Direct Current) transmission system equipment failure rate is more than 2 times of AC system.
Repeatedly occur the Insulation Problems at a plurality of positions such as valve side winding, lead-in wire, shunting switch during first batch of converter power transformer major insulation is tested in the engineering on China Pueraria lobota, Insulation Problems in the follow-up operation process, also repeatedly occurs.First converter power transformer at " cloud wide ± 800kV DC transmission engineering " of China Southern Power Grid Company is responsible for the manufacturing by Siemens Company, and first the converter power transformer of " upwards ± 800kV DC transmission engineering " of State Grid Corporation of China manufactured and designed by ABB.Siemens, ABB and Siemens are in international leading level in converter power transformer manufacturing field, but insulation fault all occurred in Siemens, first ± 800kV of ABB change of current change process of the test.Lacking further investigation both at home and abroad under interchange stack DC condition is the factor that causes accident main.
Exchanging the insulating Design field, the research of the insulating property at initial stage is mainly carried out on the basis of a large amount of model power frequencies, impulse breakdown test.In research process based on the test product flash test, by to paper oil insulation breakdown characteristics under the different oil clearances to have researched and proposed volt-distance theoretical.But because transformer insulated system is quite complicated, volt-distance is theoretical can't make proper explanations to many punch-throughs.Along with people to the going deep into of partial discharge phenomenon understanding, can go up the measurement of shelf depreciation and theoretically obtained more deep research, and then formed unified method for measurement of partial discharge at 1962 international big electrical networks.At transformer insulated design field, carry out the transition to the insulating Design that the initial field intensity of control shelf depreciation is controlled from voltage breakdown control, improved transformer insulated system reliability greatly.
Application number provides a kind of electricity-thermal-mechanical stress three factors to unite aging test unit and test method for 200810233094.1 Chinese invention patent, described test unit, comprise the thermal-electrical aging case, be provided with transformer oil paper insulation analogue means, vibrating device in the thermal-electrical aging case and be used to control the temperature control equipment of thermal-electrical aging the temperature inside the box, described vibrating device can drive the vibration of transformer oil paper insulation analogue means, and transformer oil paper insulation analogue means is electrically connected with high-voltage power supply; Described test method comprises on the ground electrode that will be affixed on behind insulating paper vacuum drying, the vacuum oil immersion in the test unit stainless steel casing, as high-field electrode, and injects insulating oil at insulating paper and ground electrode outside winding around in the stainless steel casing; High-voltage connection and high-voltage power supply are connected, and opened vibrating device; Insulating paper, insulating oil are taken a sample at interval, measure the insulation ag(e)ing parameter.This device uses wall bushing that high pressure is introduced in the airtight aging equipment; Electrode is introduced by wall bushing, and volume is bigger; Ageing oven does not externally have other interfaces, can not carry out the online oil filtration of the inner oil sample of test product and handle; The test specimen inner sealing only relies on the sealing of ageing oven to realize, can not guarantee the sealing effectiveness of test product inside.
Application number provides a kind of integrated test unit that is used for Partial Discharge Detection for 200810233095.6 Chinese invention patent, comprise the thermal-electrical aging case, test product electrode system and High Level AC Voltage origin system, the test product electrode system is arranged in the thermal-electrical aging case and with the High Level AC Voltage origin system and is connected, also comprise the local discharge signal acquisition system, described local discharge signal acquisition system comprises the local discharge signal sensor, signal-transmitting cable and data acquisition processing device, the input end of local discharge signal sensor is connected with the test product electrode system, and output terminal is connected with data acquisition processing device by signal-transmitting cable; Test unit of the present utility model can be gathered the shelf depreciation parameter in the paper oil insulation thermal-electrical aging process, for transformer oil paper insulated electrothermic ageing research provides data, on this research basis, can and then realize on-line monitoring to transformer oil paper insulated electrothermic ageing state.This device belongs in " 200810233094.1 " utility model device periphery has increased the on-line measurement device, also exists to carry out online continuously oil strain processing to the test specimen state, can't guarantee sealing property in the process of the test.And in modern insulating Design field, the test specimen environmental baseline go into key parameters such as humidity, water cut, dielectric loss, granularity and experimental performance closely related, and be vital.
At the D.C. isolation design field, be difficult to by AC and DC shelf depreciation examination insulating reliability.With typically ± the 800kV converter power transformer is an example, the change of current becomes valve side winding principal tapping alternating voltage 170/ √ 3kV, valve side DC voltage over the ground is 800kV, DC component is far above AC compounent.Valve side winding exchanges the highest 180kV of induced over voltage withstand test voltage when long, and direct current is executed withstand test voltage 1270kV when long outward.Therefore, because becoming in the process of the test in the change of current can't this actual condition of analog AC stack direct current, it is low to exchange local discharge test voltage, be difficult to find the defective that may exist in the oilpaper major insulation system, and the direct current local discharge test is insensitive to the reaction insulation defect, and it is the high topmost factors of insulation fault rate that the change of current becomes the effective examination means of valve side insulation shortage.Therefore, need study, and then inquire into the effectively ways and means of examination insulation characterisitic the insulation characterisitic that exchanges under the stack DC condition.
The utility model content
In order to overcome the defective of prior art, the purpose of this utility model is to provide a kind of hydraulic oil paper insulation characteristic test apparatus that exchanges local discharge test voltage height, can change multiple electrode.
The utility model is achieved through the following technical solutions:
A kind of hydraulic oil paper insulation characteristic test apparatus, comprise the high pressure guide rod that places in the oil drum, the epoxy resin cover plate, the vertical orientation ring, acidproof plug, high-field electrode, test product and ground-electrode, the sidewall of described oil drum is provided with oil-in and oil-out, it is characterized in that: described vertical orientation ring is fixed on the epoxy resin cover plate, and the top of described high pressure guide rod is fixed on the epoxy resin cover plate and with the epoxy resin cover plate by this vertical orientation ring and is kept vertical angle, and the bottom of described high pressure guide rod is provided with a high-field electrode, the top of described acidproof plug is fixed on the epoxy resin cover plate, its underpart is fixed on the ground-electrode, and described test product places on the ground-electrode.
Wherein, the bottom of described oil drum is provided with baffle plate, and the lower sides of described oil drum is provided with oil-in and oil-out, and described baffle plate is relative with oil-in.
Wherein, described high-field electrode is spheric electrode, needle electrode, plate electrode, suspension electrode or creeping discharge electrode.
Wherein, described high pressure guide rod adopts with high-field electrode and is threaded.
Wherein, described vertical orientation ring is the metal ring column structure, and its side is provided with the opening of 2mm, regulates the interior ring diameter of vertical orientation ring by regulating this openings of sizes with this.
Wherein, described ground-electrode is the stainless steel flat plate electrode, and its bottom is provided with earth stud.
Wherein, described oil drum is carried out hermetic seal.
Wherein, be connected with on the described oil drum and be used for vacuum extractor that oil drum is vacuumized.
The test method of a kind of hydraulic oil paper insulation characteristic test apparatus of the present utility model is as follows:
Can be at the frequent abort situation that occurs of converter power transformer operation, simulation ball-plate, pin-plate, plate-plate, along face, suspension sparking electrode model; Realization DC voltage, alternating voltage and alterating and direct current are depressed typical hydraulic oil/paper oil insulation experiment, and then can access the Characteristics of Partial Discharge and the breakdown characteristics of converter power transformer major insulation.
High pressure guide rod and high-field electrode are the screw thread docking structure, by changing different electrodes, realize simulation ball-plate, pin-plate, and plate-plate, along face, suspension sparking electrode model; By apply trial voltage of different nature on " high pressure guide rod ", realization DC voltage, alternating voltage and alterating and direct current are depressed typical hydraulic oil/paper oil insulation experiment
Described high-field electrode and stationary installation can realize the electrode replacing fast, accurately adjust electrode separation, and the accurate adjustment of described electrode separation mainly cooperates realization by using high precision clearance gauge and spiral to survey device; Electrode size as required selects the clearance gauge of different-thickness to make up, and at last by the thickness of micrometer caliper quantitative measurment clearance gauge combination, uses quantitative clearance gauge combination to limit clearance distance in the installation process.
The advantage of technical solutions of the utility model is:
1, the test unit in employing the utility model can be at the frequent abort situation that occurs of converter power transformer operation, simulation ball-plate, and pin-plate, plate-plate, along face, suspension sparking electrode model; Can realize that DC voltage, alternating voltage and alterating and direct current depress the experiment of typical hydraulic oil/paper oil insulation, and then can access the Characteristics of Partial Discharge and the breakdown characteristics of converter power transformer major insulation.
2, test unit of the present utility model adopts dismountable high-field electrode and stationary installation to realize the electrode replacing fast, accurately adjusts electrode separation, and experiment can realize continuous repeated authentication, has saved resource again simultaneously, has protected environment.
3, because the oilpaper Potential distribution distributes according to specific insulation under the DC voltage, and resistivity is subjected to extraneous factor to influence constantly variation, the test oil drum of design can be realized vacuum seal, and this has just guaranteed that test is not subjected to the influence of extraneous factor, obtains infallible test figure.In addition, pmma material has guaranteed that whole process can observe experimentation, and two passages that design on the oil drum make things convenient for the transformer oil turnover, is convenient to the processing transmission of transformer oil.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further specified.
Fig. 1 is a test unit schematic diagram of the present utility model.
Fig. 2 is typical needle plate test model figure.
Fig. 3 is the graph of a relation that dc breakdown voltage adds alternating voltage in advance.
Fig. 4 is ac breakdown voltage and the graph of a relation that adds DC voltage in advance.
Fig. 5 shows the influence of different pre-making alives to breakdown characteristics.
Fig. 6 is a paper oil insulation shelf depreciation connection layout under ball-plate electrode.
Fig. 7 is a paper oil insulation shelf depreciation connection layout under pin-plate electrode.
Fig. 8 is a paper oil insulation shelf depreciation connection layout under plate-plate electrode.
Fig. 9 is a suspension discharge test connection layout.
Figure 10 is the concrete analysis diagram of suspension sparking electrode.
Figure 11 is the oilpaper discharge test connection layout under the creeping discharge electrode.
Wherein, 1-guide rod, 2-epoxy resin cover plate, 3-vertical orientation ring, the acidproof plug of 4-, 5-high-field electrode, the 6-test product, 7-ground-electrode, 8a-oil-in, the 8b-oil-out, 9-baffle plate, 10-oil drum, the 11-spheric electrode, 12-needle electrode, 13-plate electrode, the 14-suspension electrode, 15-insulating board, 16-creeping discharge electrode.
Embodiment
Below in conjunction with accompanying drawing test unit of the present utility model is described in further detail.
As shown in Figure 1, hydraulic oil paper insulation characteristic test apparatus of the present utility model comprises the high pressure guide rod 1 that places in the oil drum 10, epoxy resin cover plate 2, vertical orientation ring 3, acidproof plug 4, high-field electrode 5, test product 6 and ground-electrode 7.The sidewall of oil drum 10 is provided with an oil-in 8a and an oil-out 8b, this oil-in and oil-out are symmetrical arranged, ground-electrode 7 adopts stainless steel flat plate structures, itself and epoxy resin cover plate 2 to be arranged in parallel, vertical orientation ring 3 is fixed on the epoxy resin cover plate 2, the top of high pressure guide rod 1 is fixed on the epoxy resin cover plate 2 and with epoxy resin cover plate 2 by this vertical orientation ring 3 and is kept vertical angle, and the lower thread of high pressure guide rod 1 is connected with a high-field electrode 5; The top of acidproof plug 4 is fixed on the epoxy resin cover plate 2, its underpart is fixed on the ground-electrode 7, and test product 6 places on the ground-electrode 7.In order to prevent that oil stream from directly impacting test product, the bottom that is preferably in oil drum 10 sets firmly a baffle plate 9 relative with oil-in 8a, and this baffle plate adopts acrylic material to make.
This test unit schematic diagram as shown in Figure 1, it mainly organizes parts and connecting mode is as follows:
1---the high pressure guide rod: adopt stainless steel high pressure guide rod structure, its surface is mainly used in the introducing of high tension voltage through meticulous polishing smooth;
2---the epoxy resin cover plate: it adopts a disc epoxy resin board, and this epoxy resin cover plate 2 matches with vertical orientation ring 3, is used for fixing high pressure guide rod 1;
3---vertical orientation ring: adopt the metal ring column structure, its side is provided with the opening of about 2mm, this vertical orientation ring is provided with a parbuckle screw, adjust openings of sizes by regulating this parbuckle screw, regulate the interior ring diameter of vertical orientation ring 3 with this, and then play the fixedly effect of high pressure guide rod 1.Vertical orientation ring 3 is by being bolted on the epoxy resin cover plate 2;
4---acidproof plug: be mainly used in circuit on power system composite insulator inside, in this device, be used for fixing epoxy resin cover plate 2, and then fixing high pressure guide rod 1.Acidproof plug has higher compression, characteristics that tensile strength is high, has therefore guaranteed that effectively the integral body of this device is subjected to force intensity, thereby guarantees that high-field electrode 5 sizes tangible deviation can not take place after this experimental provision is fastening;
5---high-field electrode is plate electrode among Fig. 1, can be replaced with the electrode of needle electrode, plate electrode, sphere, suspension electrode, creeping discharge electrode or other various ad hoc structures of different size according to actual needs;
6---test product, can be according to testing the test product that needs be replaced with different sizes, structure and shape;
7---ground-electrode, adopt the stainless steel flat plate structure, the surface is through meticulous polishing, and its bottom is provided with earth stud;
8a, 8b---oil-in 8a is installed on the relative both sides of oil drum 10 with oil-out 8b.
9---baffle plate, adopt acrylic material, be fixed on the bottom of oil drum 10 and relative with oil-in, can prevent that oil from flowing to fashionable direct impact test product.
10---oil drum, adopt transparent acrylic material to make, have advantages such as high temperature resistant, good insulation preformance, transparent easy observation.For this test unit is tested, can carry out hermetic seal to oil drum 10 under vacuum state; To have better vacuum tightness in the oil drum in order making, can on oil drum, to connect a vacuum extractor.
Choosing of high-field electrode 5 materials: in the model breakdown process, bigger electric current flows through from device, may produce at electrode surface to ablate, and influence electrode surface roughness or size, and then the result is used in influence.Device is taken measures from following two aspects, has solved the electrode surface ablation problem: the one, the test loop is improved, and adopt modes such as current-limiting resistance, series capacitance, by Theoretical Calculation, the transient current peak value during with the test short circuit is controlled in the 70A.Explore on material is selected for use on the other hand, Main Conclusions is as follows:
1) for plate electrode, platen area is big, good heat dissipation; Repeatedly the flash test result shows: puncture the back insulating medium and decompose, produce solid decomposer and be attached to electrode surface, but can not cause obviously damage of electrode itself, can adopt the common stainless steel material.
2) for spheric electrode, when adopting stainless steel electrode, repeatedly ablation phenomen may appear in puncture.Improve the back and adopt brass electrode, the brass fusing point is higher relatively on the one hand, and heat-conductive characteristic is better, deals with problems substantially.
3) for pin type electrode, can adopt brass electrode during tip diameter＞0.1mm, should adopt the higher tungsten of fusing point as starting material during tip diameter＜0.1mm.
Choosing of test electrode model fixed support material: three choosing of eradication edge support shown in Figure 1 also are one of keys of this device.Because of insulating support mainly contains 2 important function, the one, as insulating medium, the high and low pressure current potential is separated, need to bear the acting in conjunction of interchange, DC voltage, the difference of insulating property has directly determined the axial dimension of device.Another major function is that model structure is supported, need insulating material under high temperature (100 °), still can keep excellent insulating property, after most of insulating material is made the plug of diameter＜2cm, at high temperature be difficult to keep original rigidity, easily cause dimensional discrepancy, have a strong impact on test findings.This device adopts the manufacturing of epoxy resin material, and it not only has excellent dielectric properties, and molecular weight is little, and it is good that characteristics such as molecular structure densification make it have processing technology, the mechanical property height, and shrinkage factor is little, and stability is good, the good characteristic of heat resisting temperature up to 150 ℃.Make experimental study avoid the influence of unnecessary factor, obtain more genuine and believable experiment conclusion.
The selection and the design of test oil drum: conventional high-tension equipment generally adopts the metal fuel tank, introduces high-voltage power supply by bushing.The advantage of conventional metals Oiltank structure is a technology maturation, reliable and stable, but has the shortcoming of the following aspects:
1) cost height, because of this device is mainly used in the Insulation Test of carrying out under interchange, direct current and the composite voltage condition, a 300kV alternating current-direct current special test sleeve pipe price is above 1,000,000 yuan;
2) size is big, and a 300kV high voltage ac/dc special test casing size CS may surpass 3 meters, and the fuel tank body dimension is also near 2 meters, and overall dimensions is above 5 meters.
3) complicated operation needs frequently to change test product in the process of the test, when adopting the metal oil box structure, the general high pressure of conventional design is from cabling on cable rack, the form that sidepiece is windowed.Changing needs in the test product process complicated operations such as O-ring seal are opened and installed in the whole extraction of oil.
4) test is difficult for observation, because of Oiltank structure is opaque, even adopt view window, but still needs to observe near view window under well-lighted prerequisite.Observation is inconvenient, and dangerous.
This device selects for use the acrylic pmma material to process in design process, and the acrylic pmma material itself has good insulation preformance, heat-resisting, advantage such as physical strength is high, transparent, oil resistant.Low cost, size is little, is easy to observation, is designed to operate also very aspect after the box lid type structure.
With insulating oil breakdown characteristics under the needle plate condition is example, adopts the test unit among Fig. 1, constructs exemplary needle plate structure test model shown in Figure 2.
On model, apply interchange, direct current synthetic test voltage simultaneously, measure breakdown characteristics.In the process of the test, at first apply the alternating voltage of fixed component, progressively increase DC voltage again and puncture until test product.Test findings as shown in Figure 3; At first apply the DC voltage of fixed component, puncture by voltage to the test product of increasing exchanges of preface progressively, test findings as shown in Figure 4.
Test findings among Fig. 4 is carried out inverse transformation, can obtain test findings shown in Figure 5.In the insulating Design field, generally believe that oily insulation breakdown is influenced by electric field intensity mainly.When adding different voltage in advance, the electric field intensity during insulation breakdown should be consistent.But as can be seen from Figure 7, under same DC voltage, add model voltage breakdown under the alternating voltage in advance and add under the DC condition high approximately 8% more in advance.Therefore, pre-making alive has a significant effect to the alternating current-direct current disruptive strength.This conclusion is relevant report not also at home and abroad, and the Insulation Test under the DC condition, insulation examination are had great importance.
Our unit uses the test unit in the utility model, needle plate, ball plate, dull and stereotyped typical electrode and the insulation characterisitic test experimental studies such as discharge, shelf depreciation that suspend have been carried out, follow-uply also will carry out typical structure insulation characterisitic test etc., obtained a large amount of preciousnesses, had originality, the achievement in research of novelty, the development of test unit is significant in the utility model.
Be the concrete applicable cases that example provides each typical electrode in the utility model with the Characteristics of Partial Discharge of research paper oil insulation under the effect of alternating current-direct current composite voltage below.
Research is put in oilpaper office under embodiment 1 ball-plate electrode (this ball plate electrode is spheric electrode 11 and plate shaped ground-electrode 7)
Fig. 6 has provided the shelf depreciation connection layout that alterating and direct current is depressed paper oil insulation between the ball plate electrode, and among the figure 11 is ball plate electrode structure, and wherein the diameter of spheric electrode 11 is 20mm, adopts stainless steel material.The diameter that ground-electrode 7 is made for stainless steel material is that 280mm, thickness are the template electrode of 10mm.
As shown in Figure 6, each parts of test unit described in the utility model all place oil drum 10, need comprise at some peripheral components that are externally connected to of test unit of the present utility model in use: an oil filter, an oscillograph and a power-supply system, a coupling capacitance Ck and two detection impedance Z m that are used for test product and the detection of test loop local discharge signal.The syndeton of above-mentioned peripheral components and the utility model test unit is: each parts of this test unit all are mounted in the oil drum 10, oil filter is connected between the oil-in 8a and oil-out 8b on the oil drum sidewall; The upper end of the high pressure guide rod 1 of this test unit is parallel with an ac power system and a capacitor C k, the other end ground connection of ac power system, two sensor Zm have three terminals respectively and are respectively input end, output and ground: the input end of first sensor Zm links to each other with the tail end of capacitor C k, its ground connection links to each other with the earth terminal of ac power system, its output terminal links to each other with oscillograph; The lower end of the ground-electrode 7 in the input end of second sensor Zm and this test unit is connected, its earth terminal links to each other with the earth terminal of ac power system, its output terminal links to each other with oscillograph.Wherein, ac power system, capacitor C k, first sensor, oscillograph and this test unit constitute first via test circuit, when discharge signal appears in test product, show by oscillograph.Ac power system, second sensor, oscillograph and this test unit can constitute second drive test examination circuit, when discharge signal appears in test product, can show by oscillograph equally.The effect of this two-way circuit all is used for the electric discharge signal, it is the mode difference that realizes, first via test circuit is to realize by capacitive coupling, and the second tunnel current signal realization by coupling ground-electrode 7 ends can detect the loop with this two-way in use and use simultaneously.
Electrode fixing aspect, because the vertical orientation ring is fixed on the epoxy resin cover plate, ground-electrode also is fixed on the epoxy base plate by nut, and the screw thread design on stainless steel guide rod and the electrode can guarantee that electrode separation immobilizes, and can make things convenient for the replacing of electrode model again.The vertical orientation ring has realized regulating the function of electrode separation in addition, and the research of electrode different spacing of the same race is carried out in convenient test.
Put in the connection layout in office, the AC and DC power-supply system can realize that two power supplys do not disturb mutually, and is independent adjustable, applies the AC and DC component of different components on test product.Ck is that numerical value is the coupling capacitance that 500pF is connected in parallel on the test product two ends, and test product passes through to measure impedance Z m series connection ground connection, and the discharge signal office of being delivered to is put on the analyser.
Research is put in oilpaper office under embodiment 2 pins-plate electrode (this needle plate electrode is needle electrode 12 and plate shaped ground-electrode 7)
The structure of this embodiment and principle of work are same as embodiment 1 substantially, have different being only:
Be illustrated in figure 7 as local discharge test connection line figure under the needle plate electrode, 12 is the needle electrode model among the figure, wherein needlepoint electrode adopts resistant to elevated temperatures tungsten filament material, can guarantee that electrode is when each test, can not burn out distortion because of the electric spark that causes by impact, diameter is respectively 0.5,0.2,0.1 3 groups.
Research is put in oilpaper office under embodiment 3 plates-plate electrode (this plate plate electrode is plate electrode 13 and plate shaped ground-electrode 7)
The structure of this embodiment and principle of work are same as embodiment 1 substantially, have different being only:
Be illustrated in figure 8 as local discharge test connection line figure under the needle plate electrode, 13 is plate shape electrode model among the figure, hardboard electrode wherein, and material is a stainless steel, thickness 10mm, the plane is the circle of diameter 50mm.
Oilpaper discharge research under the embodiment 4 suspension sparking electrodes
The structure of this embodiment and principle of work are same as embodiment 1 substantially, have different being only:
Fig. 9 is the oilpaper discharge test connection layout under the suspension sparking electrode, and the concrete parsing of suspension sparking electrode is seen shown in Figure 10.Hardboard electrode wherein, material is a stainless steel, thickness 10mm, the plane is the circle of diameter 50mm.
As shown in figure 10, the lower end of high pressure guide rod 1 is connected with high-voltage flat plate electrode 13, ground-electrode 7 places on the insulating board 15, leg-of-mutton copper suspension electrode 14 places on the ground-electrode 7, can adjust distance between plate electrode 13 and the suspension electrode 14 according to different situations, plate electrode 13, ground-electrode 7 and suspension electrode 14 have constituted suspension sparking electrode model;
Oilpaper discharge research under the embodiment 5 creeping discharge electrodes
The structure of this embodiment and principle of work are same as embodiment 1 substantially, have different being only:
Figure 11 is the oilpaper discharge test connection layout under the creeping discharge electrode, and stainless steel creeping discharge electrode 16 wherein is designed to the shape of donut, and exradius and interior radius of circle are respectively 250mm and 150mm.Semi-circular portions radius outstanding on interior circle is 50mm.Hardboard electrode and creeping discharge electrode place and have constituted the creeping discharge electrode model on the insulating board.
The social benefit of this device is mainly reflected in: present stage, have ripe experience about the transformer insulated design under the interchange condition both at home and abroad, but in D.C. isolation characteristic field, research is comparatively weak, main equipment accident rate height such as converter power transformer.Our unit now bears State Grid Corporation of China's science and technology item " oilpaper major insulation characteristic research under the high voltage direct current condition " (project subsidy GHZ200814), and the device that the utility model relates to successfully uses in this project.And numerous innovative research achievements of also not reporting have both at home and abroad been found.
The utility model is described according to specific exemplary embodiment herein.To carry out suitable replacement under the scope of the present utility model or revise will be conspicuous not breaking away to one skilled in the art.Exemplary embodiment only is illustrative, rather than to the restriction of scope of the present utility model, scope of the present utility model is by appended claim definition.
Claims (8)
1. hydraulic oil paper insulation characteristic test apparatus, comprise the high pressure guide rod (1) that places in the oil drum (10), epoxy resin cover plate (2), vertical orientation ring (3), acidproof plug (4), high-field electrode (5), test product (6) and ground-electrode (7), the sidewall of described oil drum (10) is provided with oil-in (8a) and oil-out (8b), it is characterized in that: described vertical orientation ring (3) is fixed on the epoxy resin cover plate (2), the top of described high pressure guide rod (1) is fixed in epoxy resin cover plate (2) by this vertical orientation ring (3) and upward and with epoxy resin cover plate (2) is kept vertical angle, the bottom of described high pressure guide rod (1) is provided with a high-field electrode (5), the top of described acidproof plug (4) is fixed on the epoxy resin cover plate (2), its underpart is fixed on the ground-electrode (7), and described test product (6) places on the ground-electrode (7).
2. test unit as claimed in claim 1 is characterized in that: the bottom of described oil drum (10) is provided with baffle plate (9), and the lower sides of described oil drum (10) is provided with oil-in (8a) and oil-out (8b), and described baffle plate (9) is relative with oil-in (8a).
3. test unit as claimed in claim 1 or 2 is characterized in that: described high-field electrode (5) is spheric electrode (11), needle electrode (12), plate electrode (13), suspension electrode (14) or creeping discharge electrode (16).
4. test unit as claimed in claim 3 is characterized in that: described high pressure guide rod (1) adopts with high-field electrode (5) and is threaded.
5. test unit as claimed in claim 3 is characterized in that: described vertical orientation ring (3) is the metal ring column structure, and its side is provided with the opening of 2mm, regulates the interior ring diameter of vertical orientation ring (3) by regulating this openings of sizes with this.
6. test unit as claimed in claim 4 is characterized in that: described ground-electrode (7) is the stainless steel flat plate electrode, and its bottom is provided with earth stud.
7. test unit as claimed in claim 5 is characterized in that: described oil drum (10) is carried out hermetic seal.
8. as the arbitrary described test unit of claim 4-6, it is characterized in that: be connected with on the described oil drum (10) and be used for vacuum extractor that oil drum is vacuumized.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010205338473U CN201993436U (en) | 2010-09-16 | 2010-09-16 | High-voltage oiled paper insulation characteristic testing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010205338473U CN201993436U (en) | 2010-09-16 | 2010-09-16 | High-voltage oiled paper insulation characteristic testing device |
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| CN201993436U true CN201993436U (en) | 2011-09-28 |
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| CN103176058A (en) * | 2013-03-27 | 2013-06-26 | 国家电网公司 | Device for measuring transformer oil paper insulation test piece |
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| 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 |
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| CN104678130B (en) * | 2015-03-11 | 2017-07-14 | 中国科学院上海硅酸盐研究所 | Available for the fixture for carrying out electrical performance testing under high voltages |
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| CN108226675B (en) * | 2017-12-21 | 2019-10-01 | 北京交通大学 | High-temperature superconductor band high pressure ageing test apparatus |
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Effective date of registration: 20140321 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee after: State Grid Corporation of China Patentee after: China Electric Power Research Institute Address before: 100192 Beijing city Haidian District Qinghe small Camp Road No. 15 Patentee before: China Electric Power Research Institute |
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