CN114859196A - Profiling electrode device for testing insulation characteristics of transformer winding end part - Google Patents
Profiling electrode device for testing insulation characteristics of transformer winding end part Download PDFInfo
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- CN114859196A CN114859196A CN202210699175.0A CN202210699175A CN114859196A CN 114859196 A CN114859196 A CN 114859196A CN 202210699175 A CN202210699175 A CN 202210699175A CN 114859196 A CN114859196 A CN 114859196A
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- 238000004804 winding Methods 0.000 title claims abstract description 104
- 238000012360 testing method Methods 0.000 title claims abstract description 80
- 238000009413 insulation Methods 0.000 title claims abstract description 43
- 239000000463 material Substances 0.000 claims description 7
- 230000005684 electric field Effects 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 61
- 239000000123 paper Substances 0.000 description 10
- 238000009434 installation Methods 0.000 description 8
- 238000013461 design Methods 0.000 description 5
- 239000004593 Epoxy Substances 0.000 description 2
- 239000012774 insulation material Substances 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
- 239000011087 paperboard Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 239000002023 wood Substances 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
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- Housings And Mounting Of Transformers (AREA)
Abstract
The invention relates to a profiling electrode device for testing the insulation property of a winding end part of a transformer, belonging to the technical field of high-voltage measuring equipment and insulation property detection. The device comprises a fixed positioning bolt, a lower layer insulating support, a lower test electrode, a lower electrode pressing plate, a lower layer winding profiling disc, an upper layer winding profiling disc and a lower layer winding profiling disc supporting structure, a test end strip ring, an upper layer winding profiling disc, an upper electrode pressing plate, an upper high-voltage electrode and an upper integral pressing plate; the lower testing electrode is used for leading out a signal of the profiling electrode device to be tested, and the upper high-voltage electrode is used for leading in a high-voltage signal of the profiling electrode device to be tested. The invention can reduce the error of the insulation characteristic test of the winding end part of the transformer.
Description
Technical Field
The invention belongs to the technical field of high-voltage measuring equipment and insulation performance detection, and relates to a profiling electrode device for testing insulation characteristics of a winding end part of a transformer.
Background
In the design of the transformer, the design of the insulating structure has important influence on the single limit capacity and economic indexes of the transformer. Operational experience shows that the reliability of the insulation structure of the power transformer and the insulation material used by the insulation structure directly affects the operational reliability of the power transformer. The end part structure of the transformer winding is complex, and not only bears the longitudinal insulation of the insulation overlapping coverage between two adjacent layers of windings, but also bears the main insulation between the end part electrode and the ground electrode, and the discharge fault of the end part insulation structure is caused too much in the operation of the transformer. Therefore, the design of the transformer winding end insulation profiling structure in a laboratory has great engineering significance for the simulation verification of the end insulation characteristic. And a technical foundation is laid for improving the reliability of the insulation design of the transformer end.
The prior art mainly tests the insulation characteristics of single-layer insulation, edge insulation and the like which are typical in transformer oil paper insulation. Because the end insulation has an overlapped structure, two difficulties exist in developing related simulation tests, one is that the profiling structure of the end insulation is a staggered structure of upper and lower layers of windings, and the firm arrangement of the insulation paper boards in staggered spaces needs to be effectively ensured during arrangement, and the staggered layers are reasonable; and secondly, the end part of the transformer winding is of a circumferential structure, the circumferential structure is combined during arrangement, the supporting structures of the electrodes and the to-be-tested sample are reasonably arranged, a reasonable installation sequence is set, and the concentricity of each annular and disc-shaped test structure is ensured so as to reduce the test system error. The prior art cannot solve the two difficulties, so a new profiling electrode device for testing the insulation characteristics of the winding end part of the transformer is urgently needed.
Disclosure of Invention
In view of the above, the present invention is directed to provide a profiling electrode device for testing insulation characteristics of a transformer winding end, which reduces errors in testing insulation characteristics of the transformer winding end.
In order to achieve the purpose, the invention provides the following technical scheme:
a profiling electrode device for testing the insulation characteristics of the end part of a transformer winding comprises a fixed positioning bolt 1, a lower layer insulation support 2, a lower test electrode 3, a lower electrode pressing plate 4, a lower layer winding profiling disc 5, an upper layer winding profiling disc supporting structure 6, a lower layer winding profiling disc supporting structure 6, a test end strip ring 7, an upper layer winding profiling disc 8, an upper electrode pressing plate 9, an upper high-voltage electrode 10 and an upper integral pressing plate 11;
the fixed positioning bolts 1 are used for positioning the integral profiling electrode device and a to-be-tested sample, the bottom of each fixed positioning bolt is fixed at the bottom of the test box body, and n fixed positioning bolts are arranged along the periphery of the test box body;
the lower-layer insulating support 2 is annular, n fixing bolt hole sites are reserved, and the lower-layer insulating support is sleeved on the fixing and positioning bolts 1 along the hole sites and serves as a support of the lower testing electrode 3;
the lower test electrode 3 is used for leading out signals such as partial discharge, flashover voltage and the like of the profiling electrode device to be tested;
the lower electrode pressing plate 4 is annular, n fixing bolt hole sites are reserved, and the lower electrode pressing plate is sleeved on the fixing and positioning bolts 1 along the hole sites and used as a pressing plate of the lower testing electrode 3 for fixing the testing end strip ring 7;
the lower-layer winding profiling disk 5 simulates a lower-layer winding in a transformer winding structure and is placed on the lower testing electrode 3;
the upper and lower layer winding profiling disk supporting structures 6 are placed on the lower layer winding profiling disk 5 and used as supports between the upper layer winding profiling disk 8 and the lower layer winding profiling disk 5;
the testing end strip ring 7 is annular, is provided with n fixed bolt hole sites, is sleeved on the fixed positioning bolts 1 along the hole sites, and is used for cutting an oil gap between the upper-layer winding profiling disk 8 and the lower-layer winding profiling disk 5 to play a role in testing the electric field characteristics of the end part of the winding;
the upper-layer winding profiling disc 8 is used for simulating an upper-layer winding in a transformer winding structure and is placed on the upper-layer winding profiling disc supporting structure 6 and the lower-layer winding profiling disc supporting structure;
the upper electrode pressing plate 9 is annular, n fixing bolt hole sites are reserved, and the fixing positioning bolts 1 are sleeved along the hole sites and used for supporting the upper high-voltage electrode 10;
the upper high-voltage electrode 10 is used for introducing a high-voltage signal of the profiling electrode device to be tested, and can be connected with high-voltage equipment such as a high-voltage bushing, a transformer and the like in a laboratory;
the upper integral pressing plate 11 is annular, n fixing bolt hole sites are reserved, and the fixing positioning bolts 1 are sleeved along the hole sites and used for compressing and insulating the integral profiling electrode device.
Preferably, the lower layer winding profiling disc 5, the upper layer winding profiling disc support structure 6 and the upper layer winding profiling disc 8 are all disc-shaped structures, and the circle center of the disc-shaped structures is concentric with the circumference of the lower testing electrode 3 and the upper high-voltage electrode 10.
Preferably, the fixing and positioning bolt 1 is made of an insulating material.
Preferably, the lower insulating support 2, the lower electrode pressing plate 4 and the upper electrode pressing plate 9 are made of insulating paper pressing plates, and hollow parts of the insulating paper pressing plates are formed by turning the whole insulating paper pressing plates.
Preferably, the lower layer winding profiling disc 5, the upper and lower layer winding profiling disc supporting structure 6, the testing end strip coil 7, the upper layer winding profiling disc 8 and the upper integral pressing plate 11 are made of insulating layer pressing plates.
The invention has the beneficial effects that: the device can effectively ensure that the insulation paper boards of the profiling structure with insulated ends are firmly arranged in the staggered space and the staggered layers are reasonable; secondly, the device of the invention is provided with reasonable electrodes and a supporting structure of a test article to be tested according to the circumferential structure of the winding end part of the transformer, and designs a reasonable installation sequence to ensure that each annular and disc-shaped test structure has concentricity, thereby reducing the test system error.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a sectional view of a profiling electrode device for testing insulation characteristics of a winding end portion of a transformer in example 1;
FIG. 2 is a plan view of a profiling electrode device for testing insulation characteristics of a winding end portion of a transformer in example 1;
reference numerals: 1-fixing and positioning bolts, 2-a lower layer insulating support, 3-a lower part test electrode, 4-a lower part electrode pressing plate, 5-a lower layer winding profiling disc, 6-an upper layer winding profiling disc supporting structure, 7-a test end strip coil, 8-an upper layer winding profiling disc, 9-an upper part electrode pressing plate, 10-an upper part high voltage electrode and 11-an upper part integral pressing plate.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 2, embodiment 1: fig. 1 is a cross-sectional view of a profiled electrode assembly for testing insulation characteristics of a transformer winding head according to the present embodiment, wherein a fixing and positioning bolt 1 is firmly fixed in a test box filled with transformer oil. The overlapping structure of the insulating laminated board in the middle of the device can be used for simulating the overlapping structure of the cushion blocks at the end part of the transformer winding, and the upper part and the lower part are provided with test electrodes for introducing high voltage and leading out measurement signals. The introduced high-voltage signal can be in voltage types such as alternating current, direct current, alternating current-direct current superposition, polarity inversion and the like. The led-out measurement signals can be used for extracting signals of different types such as partial discharge signals, breakdown voltage signals and the like according to the test requirements. As shown in figure 1 of the drawings, in which,
the fixed positioning bolt 1 is used for positioning the integral profiling electrode and a to-be-tested sample, the epoxy material can also be insulation materials such as insulation wood and an insulation paper pressing plate, the bottom of the fixed positioning bolt is fixed at the bottom of the test box body, and 6 pieces of the epoxy material are distributed along the circumference, as shown in figure 2.
The lower insulating support 2 is annular, 6 fixing bolt hole sites are reserved, and the hollow part is formed by turning an integral insulating paper pressing plate and used as a support of the lower testing electrode 3.
And the lower test electrode 3 is used for leading out signals such as partial discharge, flashover voltage and the like of the profiling electrode device to be tested.
The lower electrode pressing plate 4 is annular, 6 fixing bolt hole sites are reserved, and a hollow part is formed by turning an integral insulating paper pressing plate and used as a pressing plate of the lower testing electrode 3 for fixing the testing end strip ring 7.
The lower layer winding profiling disk 5 simulates a lower layer winding in a transformer winding structure, is placed on the lower part test electrode 3, and is of a disk-shaped structure and made of insulating layer pressboard materials.
The upper and lower layer winding profiling disk supporting structure 6 is placed on the lower layer winding profiling disk 5, and is of a disc-shaped structure, and the insulating layer pressing board is made of materials and serves as a support between the upper layer winding profiling disk 8 and the lower layer winding profiling disk 5.
And the test end strip ring 7 is of an annular structure, 6 fixing bolt hole sites are reserved, and the insulating layer pressing paper plate is made of a material and used for cutting an oil gap between the upper-layer winding profiling disk 8 and the lower-layer winding profiling disk 5 and playing a role in testing the electric field characteristics of the end part of the winding.
The upper-layer winding profiling disk 8 simulates an upper-layer winding in a transformer winding structure, and is placed on the upper-layer winding profiling disk supporting structure 6, the upper-layer winding profiling disk is of a disc-shaped structure, and the insulating layer is made of a paper pressing plate.
The upper electrode pressing plate 9 is annular, 6 fixing bolt hole sites are reserved, and the hollow part is formed by turning an integral insulating paper pressing plate and used for supporting the upper high-voltage electrode 10.
The upper high-voltage electrode 10 is used for introducing and applying a high-voltage signal of the profiling electrode device to be tested, and can be connected with high-voltage equipment such as a high-voltage bushing, a transformer and the like in a laboratory.
The upper integral pressing plate 11 is of an annular structure, 6 fixing bolt hole sites are reserved, and the insulating layer pressing plate is made of an insulating layer pressing plate material and used for pressing and insulating the integral testing device.
The installation steps of the test device for the insulation characteristic test of the winding end part of the transformer in the embodiment 1 are as follows:
step 1: and 6 fixed positioning bolts 1 are installed, installation positions need to be reserved in the test box body, and the test box body is installed along the circumferential direction.
Step 2: and installing a lower-layer insulating support 2, and sleeving the lower-layer insulating support on the fixed positioning bolt 1 along the hole position.
And step 3: and (3) mounting a lower test electrode, wherein the lower part of the test box is provided with a reserved interface of the electrode and fixed with the reserved interface.
And 4, step 4: and a lower electrode pressing plate 4 is arranged and sleeved on the fixed positioning bolt 1 along the hole position.
And 5: and a lower-layer winding profiling disk 5 is arranged and placed on the lower testing electrode 3, and the lower-layer winding profiling disk is required to be concentric with the circumference of the electrode during installation.
Step 6: and an upper layer winding profiling disk supporting structure 6 and a lower layer winding profiling disk supporting structure 6 are arranged on the lower layer winding profiling disk 5 and need to be concentric with the circumference of the electrode during installation.
And 7: and mounting a test end strip ring 7, and sleeving the fixed positioning bolt 1 along the hole position.
And step 8: the upper layer winding profiling disk 8 is arranged on the upper layer winding profiling disk supporting structure 6 and needs to be concentric with the circumference of the electrode during installation.
And step 9: and an upper electrode pressing plate 9 is arranged and sleeved on the fixed positioning bolt 1 along the hole position.
Step 10: and (3) installing the upper high-voltage electrode 10, and fixing a reserved interface of the high-voltage electrode of the test box.
Step 11: an upper integral pressing plate 11 is arranged and sleeved on the fixed positioning bolt 1 along the hole position.
Step 12: after the installation is finished, the vacuum oil filtering treatment needs to be carried out on the test device in the test box body according to relevant standards, and the test can be carried out after the oil product is qualified.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (6)
1. A profiling electrode device for testing the insulation characteristics of the end part of a transformer winding is characterized by comprising a fixed positioning bolt (1), a lower-layer insulation support (2), a lower testing electrode (3), a lower electrode pressing plate (4), a lower-layer winding profiling disc (5), an upper-layer winding profiling disc supporting structure (6), a testing end strip ring (7), an upper-layer winding profiling disc (8), an upper electrode pressing plate (9), an upper high-voltage electrode (10) and an upper integral pressing plate (11);
the fixed positioning bolts (1) are used for positioning the integral profiling electrode device and the to-be-tested sample, the bottom of the fixed positioning bolts is fixed at the bottom of the test box body, and n bolts are arranged along the periphery of the fixed positioning bolts;
the lower-layer insulating support (2) is annular and is used as a support of the lower test electrode (3);
the lower test electrode (3) is used for leading out a signal of the profiling electrode device to be tested;
the lower electrode pressing plate (4) is annular and is used as a pressing plate of the lower testing electrode (3) and used for fixing the testing end strip ring (7);
the lower-layer winding profiling disc (5) simulates a lower-layer winding in a transformer winding structure and is placed on the lower testing electrode (3);
the upper and lower layer winding profiling disc supporting structure (6) is placed on the lower layer winding profiling disc (5) and is used as a support between the upper layer winding profiling disc (8) and the lower layer winding profiling disc (5);
the testing end strip ring (7) is annular and is used for dividing an oil gap between the upper-layer winding profiling disc (8) and the lower-layer winding profiling disc (5) and playing a role in testing the electric field characteristics of the end part of the winding;
the upper-layer winding profiling disc (8) is used for simulating an upper-layer winding in a transformer winding structure and is placed on the upper-layer winding profiling disc supporting structure (6) and the lower-layer winding profiling disc supporting structure;
the upper electrode pressing plate (9) is annular and is used for supporting an upper high-voltage electrode (10);
the upper high-voltage electrode (10) is used for introducing a high-voltage signal of the profiling electrode device to be detected;
and the upper integral pressing plate (11) is annular and is used for pressing and insulating the integral profiling electrode device.
2. The profiling electrode device for testing the insulation property of the winding head of the transformer according to claim 1, wherein n fixing bolt hole sites are reserved on the lower insulation support (2), the lower electrode pressing plate (4), the testing end strip ring (7), the upper electrode pressing plate (9) and the upper integral pressing plate (11) and are sleeved on the fixing and positioning bolts (1) along the hole sites.
3. The profiling electrode device for insulation characteristic test of transformer winding head according to claim 1, characterized in that the lower layer winding profiling disc (5), the upper and lower layer winding profiling disc support structure (6) and the upper layer winding profiling disc (8) are all disc-shaped structures with a circle center concentric with the circumference of the lower test electrode (3) and the upper high voltage electrode (10).
4. The profiling electrode device for testing the insulation property of the winding head of the transformer according to claim 1, characterized in that the fixing and positioning bolt (1) is made of an insulating material.
5. The profiling electrode device for insulation characteristic test of transformer winding head according to claim 1, characterized in that the lower insulating support (2), the lower electrode pressing plate (4) and the upper electrode pressing plate (9) are made of insulating pressing plate material, and the hollow part is turned by the integral insulating pressing plate.
6. The profiling electrode device for insulation characteristic test of transformer winding end according to claim 1, characterized in that the lower layer winding profiling disc (5), the upper and lower layer winding profiling disc supporting structure (6), the test end coil (7), the upper layer winding profiling disc (8) and the upper integral press plate (11) are made of insulating platen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210699175.0A CN114859196A (en) | 2022-06-20 | 2022-06-20 | Profiling electrode device for testing insulation characteristics of transformer winding end part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210699175.0A CN114859196A (en) | 2022-06-20 | 2022-06-20 | Profiling electrode device for testing insulation characteristics of transformer winding end part |
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| CN114859196A true CN114859196A (en) | 2022-08-05 |
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| CN202210699175.0A Pending CN114859196A (en) | 2022-06-20 | 2022-06-20 | Profiling electrode device for testing insulation characteristics of transformer winding end part |
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| CN110275095A (en) * | 2019-06-12 | 2019-09-24 | 国网浙江省电力有限公司电力科学研究院 | Transformer insulated accelerated deterioration simulator and method |
| CN210294458U (en) * | 2019-06-26 | 2020-04-10 | 国网浙江省电力有限公司电力科学研究院 | Equivalent test model for main insulation of head of current transformer |
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2022
- 2022-06-20 CN CN202210699175.0A patent/CN114859196A/en active Pending
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| CN101957423A (en) * | 2010-09-16 | 2011-01-26 | 中国电力科学研究院 | Device for testing insulating property of high-voltage oiled paper |
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