CN103605057A - Oil paper insulation breakdown intensity test apparatus and method - Google Patents
Oil paper insulation breakdown intensity test apparatus and method Download PDFInfo
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- CN103605057A CN103605057A CN201310594376.5A CN201310594376A CN103605057A CN 103605057 A CN103605057 A CN 103605057A CN 201310594376 A CN201310594376 A CN 201310594376A CN 103605057 A CN103605057 A CN 103605057A
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Abstract
The invention provides an oil paper insulation breakdown intensity test apparatus. An oil gap width and an oil paper proportion are adjustable when an electrode device is used, and a related test method is provided. The test apparatus comprises a high voltage portion, a low voltage portion a paper plate adjusting portion. The apparatus simplifies the tedious steps of distance and proportion adjusting in a conventional oil paper insulation test, can flexibly and conveniently adjust the oil gap width and the oil paper proportion, is applied to an overvoltage resistance contrast test in DC, AC and AC/DC composite electric fields, and provides an innovative operation concept and a good test base for oil paper testing. The apparatus is simple in structure and convenient to operate. A test result shows that good test effects can be obtained.
Description
Technical field
The present invention relates to insulation of electrical installation on-line monitoring and fault diagnosis field, particularly a kind of all experimental provisions of adjustable transformer oil paper insulation disruptive strength of oil clearance width and oilpaper ratio that are convenient under direct current, interchange and alternating current-direct current compound field.
Background technology
Power transformer, as the core of energy conversion in delivery of electrical energy and delivery process, is the equipment of most important in equipment safety operation and most critical.The major accident of transformer can cause the interruption of electric power supply, and causes huge economic loss.Research shows, the transformer fault that transformer is caused by interior Insulation Problems accounts for major part.Transformer Oil-Paper Insulation is the important component part of insulation in it, the distortion that paper oil insulation medium inside will cause internal electric field to distribute due to the accumulation of space charge, serious electric field distortion will cause the puncturing with aging of Oil-Paper Insulation, thereby threatens the safety and reliability of operating transformer.
And in DC transmission system, converter power transformer is as one of most important power equipment, the composite insulation structure that in it, insulation adopts transformer oil and insulating paper to form mostly, puncturing with aging of paper oil insulation material will directly affect the safety and reliability of insulation system; In addition, converter transformer valve-side major insulation had both been born whole electric field actions that AC transformer bears and the electric field action of trial voltage, also to bear DC electric field effect in normal operation simultaneously, while having an accident or the effect of reversal of poles voltage, so its insulation system need bear alternating current-direct current compound field.Oil-paper combination insulation is typical laminated insulation structure, its breakdown characteristics depends on voltage distribution relation and the oilpaper distribution proportion relation of compound field in transformer oil and immersion oil cardboard, therefore for analogue transformer operating condition better, in test, should apply direct current, interchange and alternating current-direct current compound field, by change oil clearance width, oilpaper ratio, carry out disruptive strength test, for transformer actual motion provides technical foundation.
Summary of the invention
In view of this, technical matters to be solved by this invention is to provide a kind of paper oil insulation disruptive strength experimental provision and method.
One of object of the present invention is the experimental provision of the adjustable paper oil insulation disruptive strength test electrode of a kind of oil clearance width of proposition and oilpaper ratio; Two of object of the present invention is experimental techniques of the adjustable paper oil insulation disruptive strength test electrode of a kind of oil clearance width of proposition and oilpaper ratio.
One of object of the present invention is achieved through the following technical solutions:
A kind of paper oil insulation disruptive strength experimental provision provided by the invention, comprises lubricating cup, high-field electrode, low-field electrode, fixed support and cardboard platform;
Described high-field electrode one end is for being connected with high-voltage power supply, and the other end runs through lubricating cup wall of cup and is connected with the low-field electrode one end that is arranged at lubricating cup inside, the other end ground connection of described low-field electrode;
Described high-field electrode and low-field electrode are symmetricly set in the both sides of lubricating cup;
Described fixed support is arranged at lubricating cup wall of cup outside; Described fixed support is positioned at lubricating cup rim of a cup top and is also provided with for the fixing cardboard regulating device of cardboard platform;
Described cardboard platform one end is connected with cardboard regulating device, and the other end is arranged at the gap of two low-field electrodes that are positioned at lubricating cup inside.
Further, described cardboard regulating device is the turn adjusting screw(rod) that is symmetricly set in fixed support both sides, and described turn adjusting screw(rod) is formed for the fixedly clamping end of cardboard platform in lubricating cup inside.
Further, described cardboard platform comprises stator, lower stator and U-shaped pad;
Fixed sheet comprises two upper organic glass rectangular sheets that are formed by connecting through bolt, and described upper organic glass rectangular sheet outside is by clamping turn screw rod end, fits with U-shaped pad top in described upper organic glass rectangular sheet inner side;
Described lower stator comprises two lower organic glass rectangular sheets that are formed by connecting through nut, and described lower organic glass rectangular sheet inner side and the laminating of U-shaped pad bottom are unsettled outside described lower organic glass rectangular sheet;
Described U-shaped gasket shape is inverted U-shaped, opening down.
Further, described high-field electrode runs through lubricating cup wall of cup by axostylus axostyle, and described axostylus axostyle is placed oil-leakage-prevention rubber band through in the hole of wall of cup; Described low-field electrode runs through lubricating cup wall of cup by axostylus axostyle, and described axostylus axostyle is placed oil-leakage-prevention rubber band through in the hole of wall of cup.
Further, described fixed support internal diameter equates with lubricating cup external diameter, is placed on lubricating cup outer wall projection, higher than lubricating cup open height.
Further, the axostylus axostyle of described high-field electrode and low-field electrode arranges axostylus axostyle fixed screw near wall of cup side, described axostylus axostyle inner hollow place electrodes span scale; Described electrode span scale outboard end coupling nut, and screw by screw thread at axostylus axostyle outer openings place.
Further, described fixed support is being provided with bracket holes higher than lubricating cup open height place, and described bracket holes arranges internal thread;
The described turn adjusting screw(rod) body of rod arranges external thread and is closely connected with bracket holes, by turn screw rod, moves upper stator;
Fixed sheet center is provided with fixedly film perforation, and described fixedly film perforation is provided with internal thread, and is connected by screw threads for fastening with turn adjusting screw(rod).
Further, on the described turn adjusting screw(rod) body of rod, be carved with a millimeter scale strip; Described lubricating cup cup is fired and is formed by stupalith;
Described high-field electrode, low-field electrode, axostylus axostyle, turn adjusting screw(rod) are made by copper product;
Described fixed support, upper stator, lower stator and bolt are made by organic glass;
Described U-shaped pad is made by epoxide resin material.
Two of object of the present invention is achieved through the following technical solutions:
The experimental technique of the paper oil insulation disruptive strength test electrode that oil clearance width provided by the invention and oilpaper ratio are adjustable, comprises the following steps:
S1: dried transformer oil and insulating paper are put into aging casing and carry out aging;
S2: from ageing oven, take out oil sample and pour in lubricating cup, standing after it is even, carry out the broad-adjustable oil-paper combination insulation disruptive strength test of oil clearance;
S3: insulating paper is fixedly inserted to cardboard platform, carry out the adjustable oil-paper combination insulation disruptive strength test of oil clearance width and oilpaper ratio.
Further, in described step S1, transformer oil and insulating paper are dry and ageing process is specific as follows: first by insulating paper in 90 ℃/50Pa environment dry 48 hours, then insulating paper is put into transformer oil at 40 ℃/50Pa environment degassed 48 hours, then insulating paper is put into ageing oven and carry out aging; Required transformer oil is put into sealable tank, after extracting vacuum, put into ageing oven and carry out aging;
In described step S2, the broad-adjustable disruptive strength test process of oil clearance is specific as follows: the axostylus axostyle fixed screw of first outwarding winding changes low-field electrode clearance distance, described clearance distance is read by electrode span scale, with upper and lower stator difference fixed insulation paper top, bottom, by the fixing upper stator in clamping end of turn adjusting screw(rod); Again whole device is put into high-pressure test platform, after connecting circuit, this device is applied to high pressure; Progressively improve and apply voltage, after device interior oil gap punctures, the magnitude of voltage that record now applied; Disconnecting circuit after off-test, the axostylus axostyle fixed screw of again outwarding winding, changes electrode distance, changes pattern, tests the oil-paper combination insulation disruptive strength under this oil clearance width;
In described step S3, the adjustable oil-paper combination insulation disruptive strength test process of oil clearance width and oilpaper ratio is specific as follows: get oil-immersed insulating paper, with upper and lower stator difference fixed insulation paper top, bottom, by the fixing upper stator in clamping end of turn adjusting screw(rod), again whole device is put into high-pressure test platform, after connecting circuit, this device is applied to high pressure; Progressively improve and apply voltage, after device interior oil paper insulation punctures, the magnitude of voltage that record now applied; Disconnecting circuit after off-test, changes multilayer oil-immersed insulating paper, and uses U-shaped pad to adjust after the spacing of cardboard platform, and mobile turn adjusting screw(rod), by stepping up the fixing upper stator in end, is tested the oil-paper combination insulation disruptive strength under this oilpaper ratio.
The invention has the advantages that: the invention provides a kind of paper oil insulation disruptive strength experimental provision and method.This device has been simplified the loaded down with trivial details step of adjusting distance and ratio in paper oil insulation test in the past, for paper oil insulation experiment provides the realization approach of innovation and good experimental basis; This apparatus structure is simple, easy to operate, and test findings shows to obtain good test effect, and the advantage of this device is specific as follows:
1. can adjust flexibly and easily oil clearance width, for the contrast tests such as disruptive strength of oil-paper combination insulation under different oil clearance width provide good experimental basis.
2. can regulate flexibly and easily oilpaper ratio, for the contrast tests such as oil-paper combination insulation disruptive strength under different oilpaper ratios provide good experimental basis.
3. this device is applicable to the disruptive strength test under interchange, direct current and alternating current-direct current Composite Field, for the disruptive strength test under different alternating current-direct current composition electric fields provides good experimental basis.
Accompanying drawing explanation
In order to make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is described in further detail, wherein:
Fig. 1 is the adjustable paper oil insulation disruptive strength test electrode test unit of oil clearance width and oilpaper ratio;
Fig. 2 is the cardboard platform structure schematic diagram in test electrode test unit;
Fig. 3 is the adjustable paper oil insulation disruptive strength test electrode test method process flow diagram of oil clearance width and oilpaper ratio.
Wherein, 1, lubricating cup; 2, axostylus axostyle fixed screw; 3, fixed support; 4, turn adjusting screw(rod); 5, low-field electrode; 6, lower stator; 7, upper stator; 8, filling pad; 9, electrode span scale.
Embodiment
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail; Should be appreciated that preferred embodiment is only for the present invention is described, rather than in order to limit the scope of the invention.
Fig. 1 is the adjustable paper oil insulation disruptive strength test electrode test unit of oil clearance width and oilpaper ratio, and Fig. 2 is the cardboard platform structure schematic diagram in test electrode test unit, and wherein, 1 is lubricating cup, by dedicated ceramic, is built and is formed; 2 is the axostylus axostyle fixed screw of electrode, by copper product, is made; 3 is fixed support, by pmma material, is made, and its internal diameter equates with lubricating cup external diameter; 4 is turn adjusting screw(rod), by copper product, is made; 5 is low-field electrode, by copper product, is made, and structural parameters need meet GB requirement; 6 is lower stator, by two organic glass thin slices, through bolt (for organic glass material), is formed by connecting; 7 is upper stator, by two organic glass thin slices, through bolt (for organic glass material), is formed by connecting; 8 is " U " type pad, for epoxide resin material, machining precision need meet the specification requirement of standard component, as shown in the figure: the experimental provision of the paper oil insulation disruptive strength test electrode that oil clearance width provided by the invention and oilpaper ratio are adjustable, electrode assembly in use oil clearance width and oilpaper ratio adjustable, comprise lubricating cup, high-field electrode, low-field electrode, fixed support and cardboard platform;
Described high-field electrode one end is for being connected with high-voltage power supply, and the other end runs through lubricating cup wall of cup and is connected with the low-field electrode one end that is arranged at lubricating cup inside, the other end ground connection of described low-field electrode;
Described high-field electrode and low-field electrode are symmetricly set in the both sides of lubricating cup; Low-field electrode is high-field electrode to lateral electrode;
Described fixed support is arranged at lubricating cup wall of cup outside; Described fixed support is positioned at lubricating cup rim of a cup top and is also provided with for the fixing cardboard regulating device of cardboard platform;
Described cardboard platform one end is connected with cardboard regulating device, and the other end is arranged at the gap of two low-field electrodes that are positioned at lubricating cup inside.
Described cardboard regulating device is the turn adjusting screw(rod) that is symmetricly set in fixed support both sides, and described turn adjusting screw(rod) is formed for the fixedly clamping end of cardboard platform in lubricating cup inside.
Described cardboard platform comprises stator, lower stator and U-shaped pad;
Fixed sheet comprises two upper organic glass rectangular sheets that are formed by connecting through bolt, and described upper organic glass rectangular sheet outside is by clamping turn screw rod end, fits with U-shaped pad top in described upper organic glass rectangular sheet inner side;
Described lower stator comprises two lower organic glass rectangular sheets that are formed by connecting through nut, and described lower organic glass rectangular sheet inner side and the laminating of U-shaped pad bottom are unsettled outside described lower organic glass rectangular sheet;
Described U-shaped gasket shape is inverted U-shaped, opening down.
Described high-field electrode runs through lubricating cup wall of cup by axostylus axostyle, and described axostylus axostyle is placed oil-leakage-prevention rubber band through in the hole of wall of cup; Described low-field electrode runs through lubricating cup wall of cup by axostylus axostyle, and described axostylus axostyle is placed oil-leakage-prevention rubber band through in the hole of wall of cup.
Described fixed support internal diameter equates with lubricating cup external diameter, is placed on lubricating cup outer wall projection, higher than lubricating cup open height.
The axostylus axostyle of described high-field electrode and low-field electrode arranges axostylus axostyle fixed screw near wall of cup side, described axostylus axostyle inner hollow place electrodes span scale; Described electrode span scale outboard end coupling nut, and screw by screw thread at axostylus axostyle outer openings place.
Described fixed support is being provided with bracket holes higher than lubricating cup open height place, and described bracket holes arranges internal thread;
The described turn adjusting screw(rod) body of rod arranges external thread and is closely connected with bracket holes, by turn screw rod, moves upper stator;
Fixed sheet center is provided with fixedly film perforation, and described fixedly film perforation is provided with internal thread, and is connected by screw threads for fastening with turn adjusting screw(rod).
On the described turn adjusting screw(rod) body of rod, be carved with a millimeter scale strip; Described lubricating cup cup is fired and is formed by testing dedicated ceramic material;
Described high-field electrode, low-field electrode, axostylus axostyle, turn adjusting screw(rod) are made by copper product;
Described fixed support, upper stator, lower stator and bolt are made by organic glass;
Described U-shaped pad is made by epoxide resin material.
Fig. 3 is the adjustable paper oil insulation disruptive strength test electrode test method process flow diagram of oil clearance width and oilpaper ratio, as shown in the figure, the experimental technique of the paper oil insulation disruptive strength test electrode that the oil clearance width that the embodiment of the present invention provides and oilpaper ratio are adjustable, comprises the following steps:
S1: dried transformer oil and insulating paper are put into aging casing and carry out aging;
S2: from ageing oven, take out oil sample and pour in lubricating cup, standing after it is even, carry out the broad-adjustable oil-paper combination insulation disruptive strength test of oil clearance;
S3: insulating paper is fixedly inserted to cardboard platform, carry out the adjustable oil-paper combination insulation disruptive strength test of oil clearance width and oilpaper ratio.
In described step S1, transformer oil and insulating paper are dry and ageing process is specific as follows: first by insulating paper in 90 ℃/50Pa environment dry 48 hours, then insulating paper is put into transformer oil at 40 ℃/50Pa environment degassed 48 hours, then insulating paper is put into ageing oven and carry out aging; Required transformer oil is put into sealable tank, after extracting vacuum, put into ageing oven and carry out aging;
In described step S2, the broad-adjustable disruptive strength test process of oil clearance is specific as follows: the axostylus axostyle fixed screw of first outwarding winding changes low-field electrode clearance distance, described clearance distance is read by electrode span scale 9, with upper and lower stator difference fixed insulation paper top, bottom, by the fixing upper stator in clamping end of turn adjusting screw(rod); Again whole device is put into high-pressure test platform, after connecting circuit, this device is applied to high pressure; Progressively improve and apply voltage, after device interior oil gap punctures, the magnitude of voltage that record now applied; Disconnecting circuit after off-test, the axostylus axostyle fixed screw of again outwarding winding, changes electrode distance, changes pattern, tests the oil-paper combination insulation disruptive strength under this oil clearance width;
In described step S3, the adjustable oil-paper combination insulation disruptive strength test process of oil clearance width and oilpaper ratio is specific as follows: get oil-immersed insulating paper, with upper and lower stator difference fixed insulation paper top, bottom, by the fixing upper stator in clamping end of turn adjusting screw(rod), again whole device is put into high-pressure test platform, after connecting circuit, this device is applied to high pressure; Progressively improve and apply voltage, after device interior oil paper insulation punctures, the magnitude of voltage that record now applied; Disconnecting circuit after off-test, changes multilayer oil-immersed insulating paper, and uses U-shaped pad to adjust after the spacing of cardboard platform, and mobile turn adjusting screw(rod), by stepping up the fixing upper stator in end, is tested the oil-paper combination insulation disruptive strength under this oilpaper ratio.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, obviously, those skilled in the art can carry out various changes and modification and not depart 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 the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (10)
1. a paper oil insulation disruptive strength experimental provision, is characterized in that: comprise lubricating cup, high-field electrode, low-field electrode, fixed support and cardboard platform;
Described high-field electrode one end is for being connected with high-voltage power supply, and the other end runs through lubricating cup wall of cup and is connected with the low-field electrode one end that is arranged at lubricating cup inside, the other end ground connection of described low-field electrode;
Described high-field electrode and low-field electrode are symmetricly set in the both sides of lubricating cup;
Described fixed support is arranged at lubricating cup wall of cup outside; Described fixed support is positioned at lubricating cup rim of a cup top and is also provided with for the fixing cardboard regulating device of cardboard platform;
Described cardboard platform one end is connected with cardboard regulating device, and the other end is arranged at the gap of two low-field electrodes that are positioned at lubricating cup inside.
2. paper oil insulation disruptive strength experimental provision according to claim 1, it is characterized in that: described cardboard regulating device is the turn adjusting screw(rod) that is symmetricly set in fixed support both sides, described turn adjusting screw(rod) is formed for the fixedly clamping end of cardboard platform in lubricating cup inside.
3. paper oil insulation disruptive strength experimental provision according to claim 1, is characterized in that: described cardboard platform comprises stator, lower stator and U-shaped pad;
Fixed sheet comprises two upper organic glass rectangular sheets that are formed by connecting through bolt, and described upper organic glass rectangular sheet outside is by clamping turn screw rod end, fits with U-shaped pad top in described upper organic glass rectangular sheet inner side;
Described lower stator comprises two lower organic glass rectangular sheets that are formed by connecting through nut, and described lower organic glass rectangular sheet inner side and the laminating of U-shaped pad bottom are unsettled outside described lower organic glass rectangular sheet;
Described U-shaped gasket shape is inverted U-shaped, opening down.
4. paper oil insulation disruptive strength experimental provision according to claim 1, is characterized in that: described high-field electrode runs through lubricating cup wall of cup by axostylus axostyle, and described axostylus axostyle is placed oil-leakage-prevention rubber band through in the hole of wall of cup; Described low-field electrode runs through lubricating cup wall of cup by axostylus axostyle, and described axostylus axostyle is placed oil-leakage-prevention rubber band through in the hole of wall of cup.
5. paper oil insulation disruptive strength experimental provision according to claim 1, is characterized in that: described fixed support internal diameter equates with lubricating cup external diameter, is placed on lubricating cup outer wall projection, higher than lubricating cup open height.
6. paper oil insulation disruptive strength experimental provision according to claim 1, is characterized in that: the axostylus axostyle of described high-field electrode and low-field electrode arranges axostylus axostyle fixed screw near wall of cup side, described axostylus axostyle inner hollow place electrodes span scale; Described electrode span scale outboard end coupling nut, and screw by screw thread at axostylus axostyle outer openings place.
7. paper oil insulation disruptive strength experimental provision according to claim 1, is characterized in that: described fixed support is being provided with bracket holes higher than lubricating cup open height place, and described bracket holes arranges internal thread;
The described turn adjusting screw(rod) body of rod arranges external thread and is closely connected with bracket holes, by turn screw rod, moves upper stator;
Fixed sheet center is provided with fixedly film perforation, and described fixedly film perforation is provided with internal thread, and is connected by screw threads for fastening with turn adjusting screw(rod).
8. paper oil insulation disruptive strength experimental provision according to claim 2, is characterized in that: on the described turn adjusting screw(rod) body of rod, be carved with a millimeter scale strip; Described lubricating cup cup is fired and is formed by stupalith;
Described high-field electrode, low-field electrode, axostylus axostyle and turn adjusting screw(rod) are made by copper product;
Described fixed support, upper stator, lower stator and bolt are made by organic glass;
Described U-shaped pad is made by epoxide resin material.
9. the paper oil insulation disruptive strength experimental technique that paper oil insulation disruptive strength experimental provision according to claim 1 carries out, is characterized in that: comprise the following steps:
S1: dried transformer oil and insulating paper are put into aging casing and carry out aging;
S2: from ageing oven, take out oil sample and pour in lubricating cup, standing after it is even, carry out the broad-adjustable oil-paper combination insulation disruptive strength test of oil clearance;
S3: insulating paper is fixedly inserted to cardboard platform, carry out the adjustable oil-paper combination insulation disruptive strength test of oil clearance width and oilpaper ratio.
10. paper oil insulation disruptive strength experimental technique according to claim 9, it is characterized in that: in described step S1, transformer oil and insulating paper are dry and ageing process is specific as follows: first by insulating paper in 90 ℃/50Pa environment dry 48 hours, then insulating paper is put into transformer oil at 40 ℃/50Pa environment degassed 48 hours, then insulating paper is put into ageing oven and carry out aging; Required transformer oil is put into sealable tank, after extracting vacuum, put into ageing oven and carry out aging;
In described step S2, the broad-adjustable disruptive strength test process of oil clearance is specific as follows: the axostylus axostyle fixed screw of first outwarding winding changes low-field electrode clearance distance, described clearance distance is read by electrode span scale, with upper and lower stator difference fixed insulation paper top, bottom, by the fixing upper stator in clamping end of turn adjusting screw(rod); Again whole device is put into high-pressure test platform, after connecting circuit, this device is applied to high pressure; Progressively improve and apply voltage, after device interior oil gap punctures, the magnitude of voltage that record now applied; Disconnecting circuit after off-test, the axostylus axostyle fixed screw of again outwarding winding, changes electrode distance, changes pattern, tests the oil-paper combination insulation disruptive strength under this oil clearance width;
In described step S3, the adjustable oil-paper combination insulation disruptive strength test process of oil clearance width and oilpaper ratio is specific as follows: get oil-immersed insulating paper, with upper and lower stator difference fixed insulation paper top, bottom, by the fixing upper stator in clamping end of turn adjusting screw(rod), again whole device is put into high-pressure test platform, after connecting circuit, this device is applied to high pressure; Progressively improve and apply voltage, after device interior oil paper insulation punctures, the magnitude of voltage that record now applied; Disconnecting circuit after off-test, changes multilayer oil-immersed insulating paper, and uses U-shaped pad to adjust after the spacing of cardboard platform, and mobile turn adjusting screw(rod), by stepping up the fixing upper stator in end, is tested the oil-paper combination insulation disruptive strength under this oilpaper ratio.
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| CN104698349A (en) * | 2015-01-16 | 2015-06-10 | 广东电网有限责任公司电力科学研究院 | Paper oil insulation partial discharge test device |
| CN104931861A (en) * | 2014-03-19 | 2015-09-23 | 国家电网公司 | Test device for testing insulating characteristic of oilpaper and test system thereof |
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