CN108680601B - Nondestructive testing clamp for winding material of dry-type distribution transformer - Google Patents
Nondestructive testing clamp for winding material of dry-type distribution transformer Download PDFInfo
- Publication number
- CN108680601B CN108680601B CN201810480404.3A CN201810480404A CN108680601B CN 108680601 B CN108680601 B CN 108680601B CN 201810480404 A CN201810480404 A CN 201810480404A CN 108680601 B CN108680601 B CN 108680601B
- Authority
- CN
- China
- Prior art keywords
- test
- clamping block
- clamping plate
- dry
- distribution transformer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004804 winding Methods 0.000 title claims abstract description 37
- 239000000463 material Substances 0.000 title claims abstract description 30
- 238000009659 non-destructive testing Methods 0.000 title claims abstract description 21
- 238000012360 testing method Methods 0.000 claims abstract description 58
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 20
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000010963 304 stainless steel Substances 0.000 claims description 3
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- 239000004809 Teflon Substances 0.000 claims 1
- 229920006362 Teflon® Polymers 0.000 claims 1
- 229910052802 copper Inorganic materials 0.000 abstract description 10
- 239000010949 copper Substances 0.000 abstract description 10
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- -1 polytetrafluoroethylene Polymers 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 229910001094 6061 aluminium alloy Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000005676 thermoelectric effect Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/72—Investigating presence of flaws
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention discloses a nondestructive testing clamp for dry-type distribution transformer winding material, which comprises: a first test jaw and a second test jaw; the first test clamping plate and the second test clamping plate are fixedly connected through a primary rivet and a secondary rivet; the first clamping block is clamped on the first test clamping plate through the fan-shaped slot; the second clamping block is clamped on the second test clamping plate through the fan-shaped slot; the double-torsion spring penetrates through the snap rivet, and the end angle of the double-torsion spring is clamped in an inner groove formed by the first test clamping plate and the second test clamping plate; copper wire preformed holes and nickel copper wire preformed holes are formed in the first clamping block and the second clamping block. The beneficial effects obtained by the invention are as follows: the collection problem to dry-type distribution transformer winding contact thermoelectric force and temperature can be effectively solved, two the same copper lines that adopt two pairs of thermocouples gather the thermoelectric force, have guaranteed the accuracy that the thermoelectric force was gathered, have reduced the wiring quantity on the anchor clamps for it is more accurate convenient to measure.
Description
Technical Field
The invention relates to the technical field of distribution transformers, in particular to a nondestructive testing clamp for winding materials of a dry-type distribution transformer.
Background
Distribution transformers are made of copper materials as windings, which is a requirement of power companies and many power consumers, but some black-heart businesses do not have to pay attention to transformers made of aluminum windings in order to gain maximum benefit. Such "aluminum-substituted-copper" transformers cause power consumers to purchase aluminum wire transformers at the price of pure copper wire, but are counterfeit, and also suffer economic losses. On the other hand, the quality of the aluminum wire transformer produced by the manufacturer is difficult to guarantee, and potential safety hazards are brought.
At present, the national grid Chongqing electric power company electric power science research institute has researched the nondestructive detection of the transformer winding material based on the thermoelectric force aiming at the winding material of the dry-type distribution transformer, the method has high reliability, and the method can refer to the invention patents of Chinese utility model patent with application number of 201620701836.9 named as an intelligent diagnosis device for the transformer winding material, invention patent with application number of 201710841433.3 named as an intelligent detection method for the transformer winding material, and invention patent with application number of 201710841351.9 named as detection equipment and system for the transformer winding material.
The above patents all adopt thermoelectric effect to measure the thermoelectric potential generated after the winding joint is heated. However, the above patents do not describe how to more accurately measure the temperature of the conductive copper bar of the dry-type distribution transformer at the measurement point after heating and the thermoelectric voltage generated at the two ends of the winding.
Based on the problems, the invention provides a test fixture for nondestructive testing of winding materials of a dry-type distribution transformer.
Disclosure of Invention
In view of the above-mentioned defects in the prior art, an object of the present invention is to provide a nondestructive testing clamp for testing winding material of a dry-type distribution transformer, which can effectively solve the problem of collecting thermoelectric force and temperature of a winding contact of the dry-type distribution transformer.
The invention aims to realize the technical scheme that the dry-type distribution transformer winding material nondestructive testing clamp comprises:
a first test jaw and a second test jaw; the first test clamping plate and the second test clamping plate are fixedly connected through a primary rivet and a secondary rivet;
the test fixture comprises a first test fixture plate, a second test fixture plate and a clamping device, wherein the first test fixture plate is provided with a fan-shaped slot; the second clamping block is clamped on the second test clamping plate through the fan-shaped slot;
the double-torsion spring penetrates through the snap rivet, and the end angle of the double-torsion spring is clamped in an inner groove formed by the first test clamping plate and the second test clamping plate;
copper wire preformed holes and nickel copper wire preformed holes are formed in the first clamping block and the second clamping block.
Further, the copper wire preformed holes and the nickel copper wire preformed holes are vertically distributed.
Furthermore, the plane of the first clamping block and the plane of the second clamping block are provided with exposed electrodes of 10mm along the direction of the clamp.
Further, the first clamping block and the second clamping block are both polytetrafluoroethylene clamping blocks.
Further, first test splint and second test splint are the aluminum alloy splint.
Further, the double torsion spring is a carbon steel double torsion spring.
Furthermore, the primary and secondary screws comprise a primary screw and a secondary screw.
Further, the primary and secondary screws are 304 stainless steel screws.
Due to the adoption of the technical scheme, the invention has the following advantages:
(1) the test fixture can make the temperature test of the thermoelectric potential generated at the joints of the winding and the high-temperature conductive copper bar more convenient and faster after heating;
(2) the accuracy of measuring the temperature of the conductive copper bar is improved, and the position for collecting the thermoelectric force is the same as the position for collecting the temperature;
(3) the test fixture can effectively solve the problem of collecting the thermoelectric force and temperature of the winding joint of the dry-type distribution transformer;
(4) according to the invention, two identical copper wires of two pairs of thermocouples are adopted to collect thermoelectric force, so that the accuracy of thermoelectric force collection is ensured, the number of wires on the clamp is reduced, and the measurement is more accurate and convenient.
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.
Drawings
The drawings of the invention are illustrated as follows:
fig. 1 is a schematic perspective partial structure view of a nondestructive testing clamp for testing winding material of a dry-type distribution transformer according to an embodiment.
Fig. 2 is a schematic structural diagram of a nondestructive testing clamp for testing winding materials of a dry-type distribution transformer according to an embodiment.
Fig. 3 is a schematic partial structural view of a nondestructive testing clamp for testing winding materials of a dry-type distribution transformer according to an embodiment.
In the figure, 1 is a first test clamp plate, 2 is a first clamp block, 3 is a primary and secondary screw, 300 is a secondary screw, 301 is a primary screw, 4 is a double torsion spring, 5 is a copper wire preformed hole, 6 is a second clamp block, 7 is a second test clamp plate, and 8 is a nickel copper wire preformed hole.
Detailed Description
The invention is further illustrated by the following figures and examples.
Example (b): as shown in fig. 1-3; the utility model provides a nondestructive test of dry-type distribution transformer winding material presss from both sides, it is including: a first test jaw 1 and a second test jaw 7; the first test splint 1 and the second test splint 7 are fixedly connected through the snap rivet 3;
the test fixture further comprises a first clamping block 2 and a second clamping block 6, wherein the first clamping block 2 is clamped on the first test clamping plate 1 through a fan-shaped slot; the second clamping block 6 is clamped on the second test clamping plate 7 through the fan-shaped slot, so that the disassembly and the rotation are convenient;
the double-torsion spring 4 penetrates through the snap rivet 3, and an end angle of the double-torsion spring 4 is clamped in an inner groove formed by the first test clamping plate 1 and the second test clamping plate 7;
copper wire preformed holes 5 and nickel copper wire preformed holes 8 are arranged on the first clamping block 2 and the second clamping block 6. The copper wire preformed holes 5 and the nickel copper wire preformed holes 8 are vertically distributed. The two poles of the thermocouple (copper wire and nickel copper wire) pass through the reserved holes on the clamping blocks respectively to collect thermoelectric force.
The first clamping block 2 and the second clamping block 6 are provided with exposed electrodes of 10mm along the clamp direction on the plane. The first clamping block 2 and the second clamping block 6 are both polytetrafluoroethylene clamping blocks. The clamping blocks are made of polytetrafluoroethylene, so that the good insulating property is achieved, the good insulating property between the two poles of the thermocouple is guaranteed, and the acquisition of thermoelectric force is more accurate.
The first test clamping plate 1 and the second test clamping plate 7 are both aluminum alloy clamping plates. The splint material is 6061 aluminum alloy, has better rigidity, and the material is lighter.
The double torsion spring 4 is a carbon steel double torsion spring, and has good rigidity and long service life.
The primary and secondary screws 3 are 304 stainless steel screws, so that the primary and secondary screws not only have good rigidity, but also have good conductivity. The primary and secondary screws 3 include a primary screw 300 and a secondary screw 301.
The invention relates to a test fixture for nondestructive testing of dry-type distribution transformer winding materials, which comprises a mechanical part and a data acquisition part: the mechanical part ensures that the clamp is reliably contacted with a copper bar of the dry-type distribution transformer, and the data acquisition part is a thermocouple measurement lead, namely a copper wire and a nickel copper wire, and is used for acquiring and testing the temperature of the basic part of the clamp and carrying out thermoelectric potential measurement. The nondestructive testing clamp for the winding material of the dry-type distribution transformer acquires the temperature and the thermoelectric potential of two ends of the heated dry-type distribution transformer winding, further calculates the thermoelectric potential generated after heating at the joint positions of the two ends of the winding through compensation calculation, and judges the material of the dry-type distribution transformer according to the value of the thermoelectric potential.
The invention is used by paying attention to the following points:
(1) the hot end and the cold end of the fixture are respectively clamped on the conductive copper bars at two ends of the dry-type transformer winding, and the temperature collected by the thermocouple on the fixture is the temperature of the clamping part of the measuring fixture.
(2) The measurement of the thermoelectric force is collected by two copper wires in two measuring clamps.
It should be understood that parts of the specification not set forth in detail are well within the prior art. 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 (8)
1. A nondestructive testing clamp for dry-type distribution transformer winding materials is characterized in that the testing clamp comprises a first testing clamping plate (1) and a second testing clamping plate (7); the first test clamping plate (1) and the second test clamping plate (7) are fixedly connected through a primary-secondary screw (3);
the test fixture is characterized by further comprising a first clamping block (2) and a second clamping block (6), wherein the first clamping block (2) is clamped on the first test clamping plate (1) through a fan-shaped groove; the second clamping block (6) is clamped on the second test clamping plate (7) through the fan-shaped slot;
the testing fixture is also provided with a double torsion spring (4), the double torsion spring (4) penetrates through the primary and secondary screws (3), and the end angle of the double torsion spring (4) is clamped in an inner groove formed by the first testing clamping plate (1) and the second testing clamping plate (7);
copper wire preformed holes (5) and nickel copper wire preformed holes (8) are formed in the first clamping block (2) and the second clamping block (6).
2. The nondestructive testing clamp for winding material of dry distribution transformer according to claim 1 wherein the copper wire preformed holes (5) and the nickel copper wire preformed holes (8) are vertically distributed.
3. A dry-type distribution transformer winding material nondestructive testing clamp as claimed in claim 1 wherein said first clamping block (2) and said second clamping block (6) have exposed 10mm electrodes in the plane of the nondestructive testing clamp.
4. A dry-type distribution transformer winding material nondestructive testing clamp as claimed in claim 1 wherein said first clamping block (2) and said second clamping block (6) are both teflon clamping blocks.
5. A dry distribution transformer winding material non-destructive testing clip as set forth in claim 1, wherein said first testing clip (1) and said second testing clip (7) are aluminum alloy clips.
6. The nondestructive testing clamp for winding material of dry distribution transformer according to claim 1 wherein said double torsion spring (4) is a carbon steel double torsion spring.
7. The nondestructive testing clamp for winding material of dry distribution transformer according to claim 1 wherein said primary and secondary screws (3) comprise a primary screw (300) and a secondary screw (301).
8. The nondestructive testing clamp for winding material of dry distribution transformer according to claim 1 wherein said primary and secondary screws (3) are 304 stainless steel screws.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810480404.3A CN108680601B (en) | 2018-05-18 | 2018-05-18 | Nondestructive testing clamp for winding material of dry-type distribution transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810480404.3A CN108680601B (en) | 2018-05-18 | 2018-05-18 | Nondestructive testing clamp for winding material of dry-type distribution transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108680601A CN108680601A (en) | 2018-10-19 |
| CN108680601B true CN108680601B (en) | 2021-02-26 |
Family
ID=63806890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810480404.3A Active CN108680601B (en) | 2018-05-18 | 2018-05-18 | Nondestructive testing clamp for winding material of dry-type distribution transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108680601B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110007167A (en) * | 2019-03-29 | 2019-07-12 | 国网山东省电力公司梁山县供电公司 | Dry-type transformer material comprehensive tester and test method |
| CN110281028A (en) * | 2019-07-29 | 2019-09-27 | 无锡新畅电子有限公司 | A kind of automatic p-wire of transformer |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001179833A (en) * | 1999-12-24 | 2001-07-03 | Toshin Denki Kk | Winding material for electric wire and method for preparing it and electric wire structure |
| CN103487615A (en) * | 2013-09-23 | 2014-01-01 | 国家电网公司 | Wire clamp special for testing of transformer |
| CN104101620A (en) * | 2014-07-21 | 2014-10-15 | 陈博捷 | Heat conducting temperature measurement comparator |
| CN106645284A (en) * | 2016-09-23 | 2017-05-10 | 西安交通大学 | Circular-tube material heat conductivity coefficient measuring system and measuring method thereof |
| CN107091853A (en) * | 2017-06-20 | 2017-08-25 | 重庆大学 | A kind of Transformer Winding detects heater |
-
2018
- 2018-05-18 CN CN201810480404.3A patent/CN108680601B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001179833A (en) * | 1999-12-24 | 2001-07-03 | Toshin Denki Kk | Winding material for electric wire and method for preparing it and electric wire structure |
| CN103487615A (en) * | 2013-09-23 | 2014-01-01 | 国家电网公司 | Wire clamp special for testing of transformer |
| CN104101620A (en) * | 2014-07-21 | 2014-10-15 | 陈博捷 | Heat conducting temperature measurement comparator |
| CN106645284A (en) * | 2016-09-23 | 2017-05-10 | 西安交通大学 | Circular-tube material heat conductivity coefficient measuring system and measuring method thereof |
| CN107091853A (en) * | 2017-06-20 | 2017-08-25 | 重庆大学 | A kind of Transformer Winding detects heater |
Non-Patent Citations (1)
| Title |
|---|
| 基于热电效应的变压器绕组材质鉴别方法;杜林等;《高电压技术》;20160731;第42卷(第7期);2275-2280 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108680601A (en) | 2018-10-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108680601B (en) | Nondestructive testing clamp for winding material of dry-type distribution transformer | |
| CN107655940B (en) | Transformer winding material detection equipment and system | |
| CN105223329B (en) | Transformer Winding material discrimination method based on pyroelectric effect | |
| CN102520237B (en) | Device and method for measuring digital AC/DC (Alternating Current/Direct Current) current conversion | |
| CN211718172U (en) | Silica gel heat conductivity testing device | |
| CN106997013A (en) | A kind of temperature rise experimental method of cable crimping point and crimping armor clamp | |
| CN108593706B (en) | Nondestructive testing system for material of winding of distribution transformer with two-end heating | |
| CN107655941B (en) | Transformer winding material detection method | |
| CN204514832U (en) | Substation transformer winding wood properly test system | |
| CN110907737A (en) | Testing device and testing method for current-carrying capacity of copper bar | |
| CN108680598B (en) | Nondestructive testing method for material of distribution transformer winding with two ends heated | |
| CN108982579B (en) | Nondestructive testing clamp for material of oil-immersed distribution transformer winding | |
| CN102759665A (en) | Device for detecting alternating-current resistance of high-pressure cable split conductor | |
| CN102081115B (en) | Method and device for indirectly measuring large DC based on AC detection | |
| CN109490631A (en) | It is a kind of for measuring the test device and its application method of live line work insulating bar insulation resistance | |
| CN102096018A (en) | Method for checking welding quality of stator winding joint of large power generator | |
| CN113092533B (en) | Measuring clamp and measuring system | |
| CN115598166B (en) | Rapid nondestructive detection method for material of transformer coil | |
| CN204855032U (en) | Thermocouple examination special fixture | |
| Qian et al. | A new method to identify the material of transformer winding | |
| CN109270110A (en) | A kind of recognition methods and system of transformer winding material | |
| CN112198190A (en) | Method and system for detecting crack defects of copper-aluminum wire clamp | |
| CN211603010U (en) | Spring contact crimping device of voltage lead | |
| CN215005620U (en) | Large-scale hydraulic generator stator stick and first piece welding quality detection device | |
| CN212410698U (en) | Universal resistance test board based on four-wire method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |