CN114002571A - Profiling electrode for testing insulation characteristic of transformer angle ring structure - Google Patents
Profiling electrode for testing insulation characteristic of transformer angle ring structure Download PDFInfo
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- CN114002571A CN114002571A CN202111297000.9A CN202111297000A CN114002571A CN 114002571 A CN114002571 A CN 114002571A CN 202111297000 A CN202111297000 A CN 202111297000A CN 114002571 A CN114002571 A CN 114002571A
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- 238000009413 insulation Methods 0.000 title claims abstract description 30
- 238000012360 testing method Methods 0.000 title claims abstract description 28
- 230000005684 electric field Effects 0.000 claims abstract description 15
- 230000000149 penetrating effect Effects 0.000 claims abstract description 7
- 230000000694 effects Effects 0.000 claims description 13
- 208000034656 Contusions Diseases 0.000 claims description 5
- 239000005030 aluminium foil Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/16—Construction of testing vessels; Electrodes therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a profiling electrode for testing the insulation characteristics of a transformer angle ring structure, which is characterized by comprising an original electrode (1), a long-side oil gap filling electrode (2), a short-side oil gap filling electrode (3) and a combined electrode connection precision screw (4). The original electrode (1) is in an L-shaped corner structure and comprises an upper electrode and a lower electrode, and a plurality of through holes (4) are formed in the upper electrode and the lower electrode; the long-side oil gap filling electrode (2) and the short-side filling electrode (3) are respectively positioned between the long-side part and the short-side part of the upper electrode and the lower electrode; the combined electrode connection precision screw is used for respectively connecting the upper electrode, the long-side oil gap filling electrode (2), the short-side filling electrode (3) and the lower electrode in sequence through penetrating screw holes. Compared with an IEC standard electrode, the electrode has the advantage of low marginal efficiency, and can realize the performance of testing the insulation characteristic of the angle ring under a uniform electric field.
Description
Technical Field
The invention belongs to the technical field of high-voltage measuring equipment and insulation performance detection, and particularly relates to a profiling electrode for testing insulation characteristics of a transformer angle ring structure.
Background
The large-scale insulation forming part angle ring plays an important role in the insulation structure of the transformer, acts on the insulation of the end part of the transformer winding, improves the electric field distribution and enhances the insulation strength. The insulation characteristic of the angle ring is an important index for representing excellent insulation performance of the angle ring, has great reference significance for manufacturing, selecting and checking the angle ring, belongs to the field of insulation performance detection technology, and has obvious influence on measurement results by a measurement method and a measurement technology. The diagonal rings are subjected to insulation performance testing, and a group of testing electrodes suitable for the diagonal rings are needed. The existing electrode can not meet the requirements of application scenes, can not realize a uniform electric field, can not be tightly attached to an angle ring to cause oil gaps, influences the accuracy of test results, and has no universality.
In summary, the existing electrode model is not suitable for testing the insulation characteristic of the transformer angle ring structure, and a new electrode model is needed to be designed for the angle ring, so that the requirement for testing the insulation characteristic of the angle ring is met. The profiling electrode has a low edge effect, is suitable for testing the insulation characteristics of the transformer angle ring structures with different corner radiuses, and has universality. When the minimum width is satisfied, the discharge can be made to occur in a uniform electric field in the middle of the electrode and not at the edges.
Object of the Invention
The invention aims to overcome the defects in the prior art and provide an angle ring profiling electrode which is suitable for testing the insulation characteristic of an angle ring structure of a transformer and has universality and low edge effect.
Disclosure of Invention
The invention provides a profiling electrode for testing the insulation characteristics of a transformer angle ring structure, which comprises an original electrode, a long-edge oil gap filling electrode, a short-edge oil gap filling electrode and a combined electrode, wherein the combined electrode is connected with a precise screw; the original electrode is in an L-shaped corner structure and comprises an upper electrode and a lower electrode, the upper electrode and the lower electrode are in L-shaped corners and respectively comprise a long edge part and a short edge part, and the long edge part and the short edge part of the upper electrode and the short edge part of the lower electrode are respectively connected with each other in a mode that the edges are in chamfer angles to form the upper electrode and the lower electrode of the L-shaped corner structure; the long side part and the short side part of the upper electrode and the lower electrode are respectively provided with a plurality of through holes; the long-side oil gap filling electrode and the short-side filling electrode are respectively positioned between the long-side parts and between the short-side parts of the upper electrode and the lower electrode; and the combined electrode is connected with a precise screw, and the upper electrode, the long-side oil gap filling electrode, the short-side filling electrode and the lower electrode are sequentially connected through the through hole.
Preferably, the thickness of the upper electrode is 10mm, the length of the long side is 90mm, the length of the short side is 60mm, the width is 50mm, and the radius of the corner of one side attached to the transformer angle ring is 15 mm; the edge chamfer is in the form of a bruises electrode model with a radius R8, with low edge effects.
Preferably, the lower electrode has a thickness of 10mm, a long side length of about 102mm, a short side length of 73mm, a width of 60mm, a corner radius of one side attached to the transformer corner ring of 28mm, an edge chamfer in the form of a bruises electrode model with a radius of R1, and a low edge effect.
Preferably, the long-side oil gap filling electrode is used for filling an oil gap, and the L-shaped corner of the long-side oil gap filling electrode is tightly attached to the long-side parts of the upper electrode and the lower electrode; the long-edge oil gap filling electrode is punched without penetrating through and is connected with the long-edge part of the original electrode through a screw to form a combined electrode.
Preferably, the short-side oil gap filling electrode is used for filling an oil gap, and an L-shaped corner of the short-side oil gap filling electrode is tightly attached to the upper electrode and the lower electrode; the short-side oil gap filling electrode is punched without penetrating through and is connected with the short-side part of the original electrode through a screw to form a combined electrode.
Preferably, the combined electrode is connected with a precision screw for connecting the original electrode and the long and short side oil gap filling electrodes; the nut of the precision screw is sunk into the screw hole on the upper electrode and is lower than the surface of the original electrode; the screw hole is sealed through the aluminium foil, prevents to produce electric field distortion in screw hole department.
Preferably, the L-shaped corners of the profiling electrode are both designed into circular arcs, wherein the diameters of the upper and lower circular arcs of the upper electrode are R2 and R3 respectively; the diameters of upper and lower circular arcs of the lower electrode are R6 and R7 respectively; when the angle ring is tightly attached to the corner of the angle ring, the oil gap can be filled by matching with a filling electrode, and when the angle rings with different sizes are measured, the angle ring is tightly attached to the electrode.
Drawings
FIG. 1 is a schematic diagram of a profiling electrode for testing insulation characteristics of a transformer angle ring structure according to the invention.
FIG. 2 is a schematic diagram of the mating of the primary electrode and the filler electrode in the contoured electrode.
FIG. 3 is a top view of the profiling electrode for testing insulation characteristics of the transformer angle ring structure according to the invention.
Fig. 4 is a schematic diagram of a profiling electrode for testing the insulation characteristic of the transformer angle ring structure.
Reference numerals:
1-original electrode of profiling electrode, 2-long side oil gap filling electrode, 3-short side oil gap filling electrode, 4-original electrode through threaded hole, 5-short side oil gap filling electrode threaded hole, 6-long side oil gap filling electrode threaded hole, and 7-low edge effect chamfer form.
Detailed Description
The following detailed description of the embodiments of the invention, taken in conjunction with the accompanying drawings, is intended to illustrate, but is not intended to limit the scope of the invention, which is defined by the appended claims, as any variation or replacement thereof may be made without departing from the spirit and scope of the invention.
FIG. 1 is a schematic diagram of a profiling electrode for testing insulation characteristics of a transformer angle ring structure according to the invention; FIG. 2 is a schematic view of the mating of the primary electrode and the filler electrode in the contoured electrode; FIG. 3 is a top view of the profiling electrode for testing insulation characteristics of the transformer angle ring structure according to the invention.
The structure of the profiling electrode is shown in figure 3, and comprises an original electrode, a long-side oil gap filling electrode, a short-side oil gap filling electrode and a combined electrode connection precision screw; the corner structure with the L-shaped original electrode comprises an upper electrode and a lower electrode, wherein the upper electrode and the lower electrode are both in L-shaped corners and respectively comprise a long-edge part and a short-edge part, and the long-edge part and the short-edge part of the upper electrode and the short-edge part of the lower electrode are respectively connected with each other in a mode that the edges are chamfered to form an upper electrode and a lower electrode of the L-shaped corner structure; the long side part and the short side part of the upper electrode and the lower electrode are respectively provided with a plurality of through holes; the long-side oil gap filling electrode and the short-side filling electrode are respectively positioned between the long-side parts and between the short-side parts of the upper electrode and the lower electrode; and the combined electrode is connected with a precise screw, and the upper electrode, the long-side oil gap filling electrode, the short-side filling electrode and the lower electrode are sequentially connected through the through hole.
Fig. 4 shows a specific embodiment of a profiling electrode for testing the insulation characteristics of a transformer angle ring structure, which mainly comprises a 1-original electrode of the profiling electrode, a 2-long-edge oil gap filling electrode, a 3-short-edge oil gap filling electrode, a 4-original electrode through threaded hole, a 5-short-edge oil gap filling electrode threaded hole, a 6-long-edge oil gap filling electrode threaded hole and a 7-low-edge effect chamfer form.
In the embodiment, the thickness of the upper electrode is 10mm, the length of the long side is 90mm, the length of the short side is 60mm, the width is 50mm, and the radius of the corner of one side attached to the transformer angle ring is 15 mm; the edge chamfer is in the form of a bruises electrode model with a radius R8, with low edge effects.
The thickness of the lower electrode is 10mm, the length of the long edge is about 102mm, the length of the short edge is 73mm, the width is 60mm, the radius of the corner of one side attached to the transformer corner ring is 28mm, the edge chamfer is in a Bruce electrode model, the radius is recorded as R1, and the lower electrode has a low edge effect.
The long-side oil gap filling electrode (2) is used for filling an oil gap, and the L-shaped corner of the long-side oil gap filling electrode is tightly attached to the long-side parts of the upper electrode and the lower electrode; the long-edge oil gap filling electrode is punched without penetrating through and is connected with the long-edge part of the original electrode through a screw to form a combined electrode.
The short-side oil gap filling electrode is used for filling the oil gap (3), and the L-shaped corner of the short-side oil gap filling electrode is tightly attached to the upper electrode and the lower electrode; the short-side oil gap filling electrode is punched without penetrating through and is connected with the short-side part of the original electrode through a screw to form a combined electrode.
The combined electrode is connected with a precise screw and is used for connecting the original electrode (1) and the long and short side oil gap filling electrodes (2) and (3); the nut of the precision screw is sunk into the screw hole on the upper electrode and is lower than the surface of the original electrode; the screw hole is sealed through the aluminium foil, prevents to produce electric field distortion in screw hole department.
The L-shaped corners of the profiling electrodes are both designed into circular arcs, wherein the diameters of the upper circular arc and the lower circular arc of the upper electrode are R2 and R3 respectively; the diameters of upper and lower circular arcs of the lower electrode are R6 and R7 respectively; when the angle ring is tightly attached to the corner of the angle ring, the oil gap can be filled by matching with a filling electrode, and when the angle rings with different sizes are measured, the angle ring is tightly attached to the electrode.
The profiling electrode can realize a uniform electric field, has universality and low edge effect, and can reduce the maximum field intensity at the edge by 15.3 percent compared with an IEC standard electrode, so that discharge is generated in the uniform electric field at the middle part of the electrode.
The low edge effect adopts a Bruce electrode model, essentially, an edge chamfer form is formed by a section of parabola and a section of circular arc together, the form can be closer to the electric field distribution, and the maximum electric field intensity of the edge of the test electrode is reduced.
The specific implementation steps for manufacturing the profiling electrode are as follows:
And 2, when the combined profiling electrode is assembled, a threaded hole needs to be punched in the original electrode and the long and short side oil gap filling electrode for screw connection. The size of the screw is selected properly, the screw is too large to easily punch holes on the long and short oil gap filling electrodes, and the screw is too small to easily and firmly connect. The screw cap of the connecting screw is embedded below the surface of the original electrode, and the threaded hole is sealed by aluminum foil to prevent electric discharge caused by distortion of an electric field at the threaded hole.
And 3, processing the edge of the profiling electrode according to a design form, wherein the profiling electrode is a Bruce electrode model, namely the Bruce electrode model is composed of a section of parabola and a section of circular arc, has a low edge effect, can greatly reduce the edge maximum field intensity value of the IEC standard electrode, and enables the discharge not to occur at the edge of the electrode but to occur in the middle part of the electrode under the condition that the designed minimum width is 50 mm. And the profiling electrode can realize a uniform electric field, and can enable the angle ring to perform insulation characteristic test in the uniform electric field.
Compared with the prior art, the profiling electrode for testing the insulation characteristic of the transformer angle ring structure provided by the invention has the following advantages:
1. the testing device can be suitable for testing the insulation characteristic of the transformer angle ring structure, the electrode is tightly attached to the angle ring, no gap is generated, the oil gap filling electrode is convenient to detach and replace, and the testing device has universality.
2. The angle ring profiling electrode is a combined electrode, compared with an IEC standard electrode, the angle ring profiling electrode has the advantage of low edge efficiency, the maximum field intensity of the edge can be reduced, discharge can be caused to occur in the middle of the electrode but not at the edge, and the insulation characteristic test of the angle ring can be performed under a uniform electric field.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A profiling electrode for testing the insulation characteristics of a transformer angle ring structure is characterized by comprising an original electrode (1), a long-side oil gap filling electrode (2), a short-side oil gap filling electrode (3) and a combined electrode connection precision screw;
the original electrode (1) is in an L-shaped corner structure and comprises an upper electrode and a lower electrode, wherein the upper electrode and the lower electrode are in L-shaped corners and respectively comprise long-side parts and short-side parts, and the long-side parts and the short-side parts of the upper electrode and the lower electrode are respectively connected with each other in a mode that the edges are chamfered to form the upper electrode and the lower electrode of the L-shaped corner structure;
the long side part and the short side part of the upper electrode and the lower electrode are respectively provided with a plurality of through holes, namely original electrode through threaded holes (4); the long-side oil gap filling electrode and the short-side filling electrode are respectively positioned between the long-side parts and between the short-side parts of the upper electrode and the lower electrode; a plurality of through holes, namely a long-edge oil gap filling electrode threaded hole (5) and a short-edge oil gap filling electrode threaded hole (6), are respectively formed in the long-edge oil gap filling electrode and the short-edge filling electrode;
the combined electrode connection precision screw is characterized in that the upper electrode, the long-side oil clearance filling electrode (2), the short-side filling electrode (3) and the lower electrode are sequentially connected through the starting electrode through threaded hole (4), the long-side oil clearance filling electrode threaded hole (5) and the short-side oil clearance filling electrode threaded hole (6).
2. The profiling electrode according to claim 1, wherein the upper electrode has a thickness of 10mm, a long side length of 90mm, a short side length of 60mm, a width of 50mm, and a corner radius of 15mm at one side attached to the transformer corner ring; the edge chamfer is in the form of a bruises electrode model with a radius R8, with low edge effects.
3. The profiling electrode according to claim 1, wherein the lower electrode has a thickness of 10mm, a length of the long side of about 102mm, a length of the short side of 73mm, a width of 60mm, a corner radius of 28mm at the side where the transformer corner ring is attached, and an edge chamfer in the form of a bruises electrode model with a radius R1, and has low edge effect.
4. The profiling electrode according to claim 1, wherein the long-side oil gap filling electrode (2) is used for filling an oil gap, and the L-shaped corner of the long-side oil gap filling electrode is tightly attached to the long-side parts of the upper electrode and the lower electrode; the long-edge oil gap filling electrode (2) is punched without penetrating through and is connected with the long-edge part of the original electrode (1) through a screw to form a combined electrode.
5. The profiling electrode according to claim 1, wherein the short side oil gap filling electrode (3) is used for filling an oil gap, and the L-shaped corner of the short side oil gap filling electrode is tightly attached to the upper electrode and the lower electrode; the short-side oil gap filling electrode is punched without penetrating through and is connected with the short-side part of the original electrode (1) through a screw to form a combined electrode.
6. The profiling electrode according to claim 1, characterized in that the combined electrode is connected with precision screws for connecting the original electrode (1), the long side oil gap filling electrode (2) and the short side oil gap filling electrode (3); the nut of the precision screw is sunk into the screw hole on the upper electrode and is lower than the surface of the original electrode; the screw hole is sealed through the aluminium foil, prevents to produce electric field distortion in screw hole department.
7. The profiling electrode according to claim 1, wherein the L-shaped corners of the profiling electrode are each designed as a circular arc, wherein the upper and lower circular arcs of the upper electrode have respective diameters of R2 and R3; the diameters of upper and lower circular arcs of the lower electrode are R6 and R7 respectively; when the angle ring is tightly attached to the corner of the transformer angle ring, the oil gap is filled by matching with the long-side oil gap filling electrode (2) and the short-side oil gap filling electrode (3), and when the angle rings of transformers with different sizes are measured, the angle ring of the transformer is tightly attached to the original electrode (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111297000.9A CN114002571A (en) | 2021-11-03 | 2021-11-03 | Profiling electrode for testing insulation characteristic of transformer angle ring structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111297000.9A CN114002571A (en) | 2021-11-03 | 2021-11-03 | Profiling electrode for testing insulation characteristic of transformer angle ring structure |
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| CN114002571A true CN114002571A (en) | 2022-02-01 |
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