CN202649256U - Anti-interference transformer winding deformation test lead wire and test device composed thereof - Google Patents
Anti-interference transformer winding deformation test lead wire and test device composed thereof Download PDFInfo
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- CN202649256U CN202649256U CN 201220210036 CN201220210036U CN202649256U CN 202649256 U CN202649256 U CN 202649256U CN 201220210036 CN201220210036 CN 201220210036 CN 201220210036 U CN201220210036 U CN 201220210036U CN 202649256 U CN202649256 U CN 202649256U
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Abstract
The utility model discloses an anti-interference transformer winding deformation test lead wire. The lead wire comprises a signal cable, a copper braided band as a ground wire, an upper connecting piece and a lower connecting piece. An upper end of the copper braided band is connected with a shielding layer on an upper portion of the signal cable through the upper connecting piece, and a lower end of the copper braided band is connected with a lower portion of the signal cable through the lower connecting piece, so that during a test, a part of the copper braided band and a part of the signal cable, positioned between the upper connecting piece and the lower connecting piece, are parallel to each other and are uniformly arranged outside a wall surface of a power transformer sleeve pipe at intervals. Disclosed is also a test device composed of the above test lead wire. The copper braided band is adopted as the ground wire, thereby effectively reducing resistance and inductance of a test loop. The signal cable and the copper braided band are parallel to each other and are arranged outside the wall surface of the sleeve pipe at intervals, thereby keeping inductance between the test lead wire and the sleeve pipe a set value, effectively minimizing influence of a test result on the test lead wire, improving accuracy of the test result, and allowing test data to be used repeatedly.
Description
Technical field
The utility model relates to the power equipment technical field of measurement and test, and particularly a kind of anti-interference type deformation of transformer winding test lead also relates to the proving installation that is comprised of above-mentioned test lead.
Background technology
Power transformer belongs to a kind of concrete form of transformer, it be by electromagnetic induction with the alternating voltage of a system and the current conversion power equipment for the voltage and current of another system, it mainly is comprised of unshakable in one's determination and cover two or more windings thereon.
Power transformer is one of most important equipment in the electric system, can its reliability is directly connected to whole electric system safely, effectively, economically operation.Power transformer is in the process that install at operational process and the scene that is transported to, winding in the power transformer may be subject to mechanical force external force or electrodynamic effect and cause winding to produce distortion, these distortion show with forms such as bird caging, bulge or displacements usually, what is more, when deformation comparison is serious, understand the generation that directly affect the serviceability of power transformer and directly cause sudden accident; In addition, winding occurs even without damaging immediately, also may stay serious potential faults after the local deformation.Therefore, must carry out deformation test to Transformer Winding, judge the state of winding according to test result, deformation test has become the important checkup item of transformer state.
At present, development along with the winding deformation diagnostic techniques, frequency response analysis (abbreviation method of frequency response method) has become the main method that is widely used in carrying out the deformation of transformer winding analysis both at home and abroad gradually, as shown in Figure 1, the existing employed proving installation of frequency response analysis comprises be used to the jointing clamp that is clamped in power transformer sleeve pipe 3 tops, winding deformation tester and lead-in wire, wherein, lead-in wire is comprised of cable 30 and ground wire 40, one end of cable 30 connects jointing clamp 31, its other end uses the BNC connector to connect winding deformation tester 32, and an end of ground wire 40 is connected with the screen layer of cable 30, the other end then is connected on the casing of power transformer as earth point, in order to improve as much as possible the accuracy of winding deformation test, the external shielding layer of cable needs ground connection, external undesired signal can be imported the earth by this layer, avoids interference signal and enters the loss that the inner conductor interference reduces signal transmission simultaneously, improves the antijamming capability of measuring cable.
The test philosophy of method of frequency response method is: the frequency response characteristic of test Transformer Winding, carry out the winding deformation analysis by the consistance that compares crest, trough frequency.The advantage of this kind method is simple to operate, easy to implement.Yet, the defective of the method is: ⑴ is owing to the at present test to deformation of transformer winding does not have the unified working specification of determining, different manufacturers can be variant in the mode of connection when testing, the difference of the distance difference of the difference in length that comprises, ground wire and sleeve pipe and employed ground wire quantity etc., also have the earth point loose contact, all can cause the variation of resistance R; ⑵ in test process, earth point for ground wire does not have clear, therefore in the situation that do not require, if guarantee the reliability of ground connection, ground wire is normally by certain bolt on the power transformer or earthing bar ground connection, the selection of butted line mode and earth point was different when this had just caused the different operating personnel to test, and measured the variation that the earth point difference will cause capacitor C twice, and the coiling of ground wire will cause the variation of inductance L.And the change of above-mentioned arbitrary parameter (comprising resistance R, capacitor C and inductance L) all will cause the variation of Transformer Winding frequency response curve, not only can not guarantee the accuracy of test data, and because the test data of front and back test process gained is inconsistent, so that test data can't reuse, thereby affected the repeatability of test data.
The utility model content
First purpose of the present utility model be to provide a kind of simple in structure, be easy to make, anti-interference type deformation of transformer winding test lead easy and simple to handle, improve measuring the corresponding structure of each parameter that may affect test data on the lead-in wire, not only improved the accuracy of test data, and so that test data is reusable.
Second purpose of the present utility model is to provide the proving installation that is comprised of above-mentioned test lead.
First purpose of the present utility model realizes by following technical measures: a kind of anti-interference type deformation of transformer winding test lead, it is characterized in that comprising signal cable, copper braid over braid as ground wire, upper connector and lower web member, the upper end of described copper braid over braid is connected by the screen layer of upper connector with described signal cable top, the lower end of described copper braid over braid is connected with the bottom of described signal cable by lower web member so that when testing copper braid over braid and described signal cable between upper connector and lower web member partial parallel and all be interval in the outside wall surface of power transformer sleeve pipe.
The utility model adopts the copper braid over braid as ground wire, and the inductance value of himself and resistance value are little, therefore can effectively reduce resistance and the inductance of test loop; Signal cable is parallel with the copper braid over braid and be interval in the outside wall surface of sleeve pipe, the electric capacity that can keep the utility model to measure between lead-in wire and sleeve pipe is definite value, can effectively reduce test lead to the impact of test result, improve the accuracy of deformation of transformer winding test result, and so that test data is reusable.
As a kind of embodiment of the present utility model, described upper connector is mainly by insulcrete, derby and set screw form, described derby is fixed on the plate face of insulcrete, the edge of described insulcrete stretches out the edge of derby, the joint face of described derby and insulcrete has mounting hole, downward-extension connects described derby and insulcrete on the described mounting hole, the joint area of described signal cable is arranged in described mounting hole, the side of described derby has positioning screw hole, this positioning screw hole is communicated with described mounting hole, described set screw passes copper braid over braid upper end and is installed in the positioning screw hole and stretches in the mounting hole and fixed and pressed closer on signal cable by nut, and the copper braid over braid then is pressed between the positioning screw hole peritreme of nut and derby.Insulcrete can prevent that derby from contacting with the equal pressure cap at bushing shell for transformer top.
In order to strengthen the connection reliability of upper connector, as a kind of improvement of the present utility model, also have the reinforcing screw relative with described positioning screw hole in the side of described derby, described reinforcing screw is communicated with described mounting hole, and the reinforcing screw is installed in the described positioning screw hole and stretches in the mounting hole and locate with the common clamping signal cable of set screw.
Derby described in the utility model and insulcrete also can adopt other existing connected mode for being threaded.
As a kind of embodiment of the present utility model, described lower web member mainly is comprised of the chuck, anchor clamps and the link that are used for being clamped on the casing flange bolt, described anchor clamps have the dop for difference clamping copper braid over braid and signal cable, described chuck, anchor clamps and link are made by conductive material, and described chuck and anchor clamps are fixedly connected by link.
Chuck described in the utility model comprises bearing, thimble and screw mandrel, described bearing is the crotch type, namely formed with two poles that are connected with mobile jib by mobile jib, consist of opening between the described pole, the end of one of them pole has threaded hole, described screw mandrel passes the threaded hole on the pole and extends in the opening of described bearing, this end is inserting end, the pole face that another pole is positioned at described bearing opening is provided with the cuspidated thimble of tool, the end face of the inserting end of described screw mandrel with the most advanced and sophisticated relative of described thimble so that on the casing flange head of bolt be clamped between screw mandrel and the thimble.
To regulate the size of clamp port, as a kind of improvement of the present utility model, the utility model also comprises hand lever for the ease of rotary screw, and the end of described MLP Manual Lever Position outside the bearing opening is provided with through hole, and described hand lever is fixed after passing through hole.
Anchor clamps described in the utility model comprise fixed dam, the first wiring pressing plate, the second wiring pressing plate and regulating part, described regulating part adopts regulates double-screw bolt and setting nut, described fixed dam and wiring pressing plate all vertically arrange, correspondingly on the plate face of described fixed dam and wiring pressing plate have two threaded holes, described adjusting double-screw bolt is fixed in the second wiring pressing plate after passing successively described threaded hole outside to inside, and be positioned at an outside end setting nut is installed regulating double-screw bolt, be the dop of described clamping signal cable so that signal cable is clamped between two wiring pressing plates, and make the copper braid over braid be clamped in the dop that is described clamping copper braid over braid between first wiring pressing plate and the fixed dam.
Link described in the utility model comprises joint pin, regulates double-screw bolt and adjusting bolt, one end of described joint pin is fixed in described the second wiring pressing plate, the other end as the inner of joint pin along in the described mobile jib of being axially fixed at of described bearing mobile jib, the inner of described joint pin has laterally to be run through and interior threaded pilot hole, have threaded hole on the described mobile jib, described threaded hole is communicated with pilot hole, and described adjusting double-screw bolt passes described threaded hole and is fixed in the pilot hole.
As preferred implementation of the present utility model, the width of described copper braid over braid is 20～30mm, both can reduce self high-frequency inductor, does not affect again the convenience of use.
Second purpose of the present utility model realizes by following technical measures: a kind of proving installation that is comprised of above-mentioned test lead, the jointing clamp and the deformation of transformer winding tester that it is characterized in that comprising test lead, are used for clamping power transformer sleeve pipe top, wherein, the jaw of described jointing clamp connects the upper end of described signal cable, the lower end of described signal cable connects described deformation of transformer winding tester, and described lower web member is connected with bolt on the casing flange, consists of test loop.
As a kind of way of recommendation of the present utility model, described signal cable is connected by BNC connector with described deformation of transformer winding tester.
Compared with prior art, the utlity model has following significant effect:
⑴ the utility model adopts the copper braid over braid as ground wire, and the inductance value of himself and resistance value are little, therefore can effectively reduce resistance and the inductance of test loop; Signal cable is parallel with the copper braid over braid and be interval in the outside wall surface of sleeve pipe, the electric capacity that can keep the utility model to measure between lead-in wire and sleeve pipe is definite value, can effectively reduce test lead to the impact of test result, improve the accuracy of deformation of transformer winding test result, and so that test data is reusable.
⑵ the utility model adopts lower web member so that lead-in wire can cause the sleeve bottom flange along sleeve surface, so that the electric capacity that keeps measuring between lead-in wire and sleeve pipe immobilizes substantially, and lower web member is provided with fixed dam and first, second wiring pressing plate that is used for the fixed copper braid over braid for the fixed signal cable, so that signal cable is in good order.
⑶ the insulcrete of upper connector has insulating effect, can prevent that cable splice from contacting with the grading shield at sleeve pipe top.
⑷ the utility model improves measuring each structure that may affect test result on the lead-in wire, meets the requirement of deformation of transformer winding specifications of surveys fully.
Of the present utility model simple in structure, be easy to make, easy and simple to handle, practical, be specially adapted to the occasion of winding deformation of power transformer test.
Description of drawings
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Structural representation when Fig. 1 is existing Winding in Power Transformer test;
Structural representation when Fig. 2 is the utility model test;
Fig. 3 is vertical cross-sectional schematic of the utility model upper connector;
Fig. 4 is the perspective view of web member under the utility model;
Fig. 5 is the sectional structure schematic diagram of lower web member.
Embodiment
Shown in Fig. 2～5, be a kind of anti-interference type deformation of transformer winding of the utility model test lead, comprise signal cable 1, the copper braid over braid 2 as ground wire, upper connector 50 and lower web member 51, the width of copper braid over braid 2 is 20mm.The upper end of copper braid over braid 2 is connected by the screen layer of upper connector with signal cable 1 top, the lower end of copper braid over braid 2 is connected with the bottom of signal cable 1 by lower web member so that when testing copper braid over braid 2 and signal cable 1 between upper connector and lower web member partial parallel and all be interval in the outside wall surface of power transformer sleeve pipe 3.
Referring to Fig. 3, upper connector 50 mainly is comprised of insulcrete 4, derby 5 and set screw 6, derby 5 is threaded connection on the plate face that is fixed on insulcrete 4, the edge of insulcrete 4 stretches out the edge of derby 5, and insulcrete 4 can prevent that derby 5 from contacting with the equal pressure cap at bushing shell for transformer 3 tops.Derby 5 has mounting hole with the joint face of insulcrete 4, downward-extension connects derby 5 and insulcrete 4 on the mounting hole, the joint area 7 of signal cable 1 is arranged in mounting hole, the side of derby 5 has positioning screw hole, this positioning screw hole is communicated with mounting hole, set screw 6 passes copper braid over braid 2 upper ends and is installed in the positioning screw hole and stretches in the mounting hole fixing by nut 8 and press closer on signal cable 1, copper braid over braid 2 then is pressed between the positioning screw hole peritreme of nut 8 and derby 5, also have the reinforcing screw relative with positioning screw hole in the side of derby 5, reinforce screw and be communicated with mounting hole, reinforcing screw 9 is installed in the reinforcing screw and stretches in the mounting hole and set screw 6 common clamping signal cables 1 location.
Referring to Fig. 4,5, lower web member 51 mainly is comprised of the chuck, anchor clamps and the link that are used for being clamped on the casing flange bolt 16, anchor clamps have the dop for difference clamping copper braid over braid and signal cable, chuck, anchor clamps and link are made by conductive material, and chuck and anchor clamps are fixedly connected by link.In the present embodiment, chuck comprises bearing, thimble 11, screw mandrel 12 and hand lever 17, bearing is the crotch type, namely by mobile jib 13 and two poles 14 that are connected with mobile jib 13,15 form, pole 14, consist of opening between 15, the end of one of them pole 15 has threaded hole, screw mandrel 12 passes the threaded hole on the pole 15 and extends in the opening of bearing, this end is inserting end, the pole face that another pole 14 is positioned at the bearing opening is provided with the cuspidated thimble 11 of tool, the end face of the inserting end of screw mandrel 12 with the most advanced and sophisticated relative of thimble 11 so that on the casing flange head of bolt 16 be clamped between screw mandrel 12 and the thimble 11.Hand lever 17 is positioned at the outer end of bearing opening and is provided with through hole, and hand lever 17 is fixed after passing through hole.
Anchor clamps comprise fixed dam 18, the first wiring pressing plate 19, the second wiring pressing plate 20 and regulating part, regulating part adopts regulates double-screw bolt 21 and setting nut 22, fixed dam 18 all vertically arranges with the wiring pressing plate, correspondingly on the plate face of fixed dam 18 and wiring pressing plate have two threaded holes, regulating double-screw bolt 21 is fixed in the second wiring pressing plate 20 after passing successively threaded hole outside to inside, and be positioned at an outside end setting nut 22 is installed regulating double-screw bolt 21, so that signal cable 1 is clamped in two wiring pressing plates 19, be the dop of clamping signal cable 1 between 20, and make copper braid over braid 2 be clamped in the dop that is clamping copper braid over braid 2 between first wiring pressing plate 19 and the fixed dam 18.
Link comprises joint pin 23, regulates double-screw bolt 24 and adjusting bolt 25, one end of joint pin 23 is fixed in the second wiring pressing plate 20, the other end is as the inner being axially fixed in the mobile jib along the bearing mobile jib of joint pin 23, the inner of joint pin 23 has laterally to be run through and interior threaded pilot hole, have threaded hole on the mobile jib, threaded hole is communicated with pilot hole, and adjusting double-screw bolt 24 passes threaded hole and is fixed in the pilot hole.
Referring to Fig. 2, a kind of proving installation that is formed by above-mentioned test lead, comprise test lead, be used for the jointing clamp 25 and deformation of transformer winding tester 26 at clamping power transformer sleeve pipe 3 tops, wherein, the jaw of jointing clamp 25 connects the upper end of signal cable 1, the lower end of signal cable 1 is by BNC connector connection transformer winding deformation tester 26, and lower web member is connected with bolt 16 on the casing flange, consists of test loop.
Embodiment of the present utility model is not limited to this, according to foregoing of the present utility model, ordinary skill knowledge and customary means according to this area, do not breaking away under the above-mentioned basic fundamental thought of the utility model prerequisite, upper connector of the present utility model, lower web member also have other embodiment; And the width of copper braid over braid can also select the numerical value of each in 20～30mm except 20mm, so the utility model can also make modification, replacement or the change of other various ways, all drops within the utility model rights protection scope.
Claims (10)
1. anti-interference type deformation of transformer winding test lead, it is characterized in that: comprise signal cable, the copper braid over braid as ground wire, upper connector and lower web member, the upper end of described copper braid over braid is connected by the screen layer of upper connector with described signal cable top, the lower end of described copper braid over braid is connected with the bottom of described signal cable by lower web member so that when testing copper braid over braid and described signal cable between upper connector and lower web member partial parallel and all be interval in the outside wall surface of power transformer sleeve pipe.
2. anti-interference type deformation of transformer winding test lead according to claim 1, it is characterized in that: described upper connector is mainly by insulcrete, derby and set screw form, described derby is fixed on the plate face of insulcrete, the edge of described insulcrete stretches out the edge of derby, the joint face of described derby and insulcrete has mounting hole, downward-extension connects described derby and insulcrete on the described mounting hole, the joint area of described signal cable is arranged in described mounting hole, the side of described derby has positioning screw hole, this positioning screw hole is communicated with described mounting hole, described set screw passes copper braid over braid upper end and is installed in the positioning screw hole and stretches in the mounting hole and fixed and pressed closer on signal cable by nut, and the copper braid over braid then is pressed between the positioning screw hole peritreme of nut and derby.
3. anti-interference type deformation of transformer winding test lead according to claim 2, it is characterized in that: also have the reinforcing screw relative with described positioning screw hole in the side of described derby, described reinforcing screw is communicated with described mounting hole, and the reinforcing screw is installed in the described positioning screw hole and stretches in the mounting hole and the common clamping signal cable of set screw.
4. anti-interference type deformation of transformer winding test lead according to claim 3, it is characterized in that: described lower web member mainly is comprised of the chuck, anchor clamps and the link that are used for being clamped on the casing flange bolt, described anchor clamps have the dop for difference clamping copper braid over braid and signal cable, described chuck, anchor clamps and link are made by conductive material, and described chuck and anchor clamps are fixedly connected by link.
5. anti-interference type deformation of transformer winding test lead according to claim 4, it is characterized in that: described chuck comprises bearing, thimble and screw mandrel, described bearing is the crotch type, namely formed with two poles that are connected with mobile jib by mobile jib, consist of opening between the described pole, the end of one of them pole has threaded hole, described screw mandrel passes the threaded hole on the pole and extends in the opening of described bearing, this end is inserting end, the pole face that another pole is positioned at described bearing opening is provided with the cuspidated thimble of tool, the end face of the inserting end of described screw mandrel with the most advanced and sophisticated relative of described thimble so that on the casing flange head of bolt be clamped between screw mandrel and the thimble.
6. anti-interference type deformation of transformer winding test lead according to claim 5, it is characterized in that: described test lead also comprises hand lever, and the end of described MLP Manual Lever Position outside the bearing opening is provided with through hole, and described hand lever passes behind the through hole fixing.
7. anti-interference type deformation of transformer winding test lead according to claim 6, it is characterized in that: described anchor clamps comprise fixed dam, the first wiring pressing plate, the second wiring pressing plate and regulating part, described regulating part adopts regulates double-screw bolt and setting nut, described fixed dam and wiring pressing plate all vertically arrange, correspondingly on the plate face of described fixed dam and wiring pressing plate have two threaded holes, described adjusting double-screw bolt is fixed in the second wiring pressing plate after passing successively described threaded hole outside to inside, and be positioned at an outside end setting nut is installed regulating double-screw bolt, be the dop of described clamping signal cable so that signal cable is clamped between two wiring pressing plates, and make the copper braid over braid be clamped in the dop that is described clamping copper braid over braid between first wiring pressing plate and the fixed dam.
8. anti-interference type deformation of transformer winding test lead according to claim 7, it is characterized in that: described link comprises joint pin, regulate double-screw bolt and adjusting bolt, one end of described joint pin is fixed in described the second wiring pressing plate, the other end as the inner of joint pin along in the described mobile jib of being axially fixed at of described bearing mobile jib, the inner of described joint pin has laterally to be run through and interior threaded pilot hole, have threaded hole on the described mobile jib, described threaded hole is communicated with pilot hole, and described adjusting double-screw bolt passes described threaded hole and is fixed in the pilot hole.
9. anti-interference type deformation of transformer winding test lead according to claim 8, it is characterized in that: the width of described copper braid over braid is 20～30mm.
10. proving installation that is formed by the described test lead of claim 1, it is characterized in that: comprise test lead, be used for jointing clamp and the deformation of transformer winding tester of grip sleeve top end, wherein, the jaw of described jointing clamp connects the upper end of described signal cable, the lower end of described signal cable connects described deformation of transformer winding tester, and described lower web member is connected with bolt on the casing flange, consists of test loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220210036 CN202649256U (en) | 2012-05-10 | 2012-05-10 | Anti-interference transformer winding deformation test lead wire and test device composed thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220210036 CN202649256U (en) | 2012-05-10 | 2012-05-10 | Anti-interference transformer winding deformation test lead wire and test device composed thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202649256U true CN202649256U (en) | 2013-01-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220210036 Withdrawn - After Issue CN202649256U (en) | 2012-05-10 | 2012-05-10 | Anti-interference transformer winding deformation test lead wire and test device composed thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202649256U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102707103A (en) * | 2012-05-10 | 2012-10-03 | 广东电网公司电力科学研究院 | Deformation test lead wire of anti-interference type transformer winding and testing device formed by same |
| CN110231373A (en) * | 2019-06-27 | 2019-09-13 | 北华大学 | A kind of detection method and detection device of transformer winding material |
| CN110415941A (en) * | 2019-08-21 | 2019-11-05 | 辽宁易发式电气设备有限公司 | A kind of transformer iron core clamp with barricade |
-
2012
- 2012-05-10 CN CN 201220210036 patent/CN202649256U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102707103A (en) * | 2012-05-10 | 2012-10-03 | 广东电网公司电力科学研究院 | Deformation test lead wire of anti-interference type transformer winding and testing device formed by same |
| CN110231373A (en) * | 2019-06-27 | 2019-09-13 | 北华大学 | A kind of detection method and detection device of transformer winding material |
| CN110231373B (en) * | 2019-06-27 | 2021-09-24 | 北华大学 | Detection method and detection device for transformer winding material |
| CN110415941A (en) * | 2019-08-21 | 2019-11-05 | 辽宁易发式电气设备有限公司 | A kind of transformer iron core clamp with barricade |
| CN110415941B (en) * | 2019-08-21 | 2024-05-14 | 辽宁易发式电气设备有限公司 | Transformer core clamping device with shielding plate |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130102 Effective date of abandoning: 20140416 |
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| RGAV | Abandon patent right to avoid regrant |