CN108534933B - Transformer winding monitoring device - Google Patents
Transformer winding monitoring device Download PDFInfo
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- CN108534933B CN108534933B CN201810257732.7A CN201810257732A CN108534933B CN 108534933 B CN108534933 B CN 108534933B CN 201810257732 A CN201810257732 A CN 201810257732A CN 108534933 B CN108534933 B CN 108534933B
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- 238000004804 winding Methods 0.000 title claims abstract description 33
- 238000012806 monitoring device Methods 0.000 title claims abstract description 15
- 238000012544 monitoring process Methods 0.000 claims abstract description 21
- 238000001914 filtration Methods 0.000 claims abstract description 7
- 230000002159 abnormal effect Effects 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 abstract description 9
- 238000009413 insulation Methods 0.000 description 11
- 238000005303 weighing Methods 0.000 description 8
- 230000006870 function Effects 0.000 description 6
- 238000004590 computer program Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000012212 insulator Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
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- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000003750 conditioning effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
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- 238000000605 extraction Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
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Abstract
The invention is suitable for the technical field of transformer monitoring, and provides a transformer winding monitoring device. The method comprises the following steps: the pressure sensor is connected with the signal conditioner, the signal conditioner is connected with the data acquisition card, and the data acquisition card is connected with the industrial personal computer; the pressure sensor is arranged on an upper clamping piece of the transformer to be tested and used for collecting a winding steady-state pressure signal of the transformer to be tested; the signal conditioner is used for filtering the steady-state pressure signal of the winding; the data acquisition card is used for converting the filtered steady-state pressure signal of the winding into a digital signal; the industrial personal computer is used for reducing the digital signal into a pressure signal, judging whether the reduced pressure signal exceeds a preset signal threshold range or not, and obtaining a monitoring result of the transformer to be detected according to a judgment result. After the scheme is adopted, the operation reliability of the transformer is improved, the working efficiency of workers is improved, and the safe and stable operation of a power grid is guaranteed.
Description
Technical Field
The invention belongs to the technical field of transformer monitoring, and particularly relates to a transformer winding monitoring device.
Background
In a power system, an oil-immersed transformer is used as one of main devices of the power system, and the operational reliability of the oil-immersed transformer is directly related to whether a power grid system can safely operate or not.
With the increasing capacity of power grids, the transformer damage accidents caused by short-circuit faults are on the rise, and statistics shows that in recent years, the accidents of transformers with the voltage class of 110kV and above are more and more, wherein the damage accidents caused by external short-circuits account for a large proportion. When the transformer is subjected to short circuit impact in operation, permanent instability deformation such as winding distortion, inclination, collapse, bulge, displacement and the like can be generated on the winding under the action of electrodynamic force, and the accumulated effect can further aggravate the deformation and further cause insulation damage, and faults such as turn-to-turn short circuit, inter-cake breakdown, main insulation discharge or complete breakdown occur.
Then, at present, the monitoring of the oil-immersed transformer is still carried out on site by manpower, the monitored data is inaccurate, and workers are required to go to the site for monitoring at intervals, so that the working efficiency of the workers is reduced, and the safe and stable operation of a power grid can be influenced because the workers cannot monitor the oil-immersed transformer.
Disclosure of Invention
In view of this, the embodiment of the present invention provides a transformer winding monitoring device, so as to solve the problem in the prior art that field monitoring is performed manually, and monitored data is inaccurate.
The embodiment of the invention provides a transformer winding monitoring device, which comprises: the pressure sensor is connected with the signal conditioner, the signal conditioner is connected with the data acquisition card, and the data acquisition card is connected with the industrial personal computer;
the pressure sensor is arranged on an upper clamping piece of the transformer to be tested and used for collecting a winding steady-state pressure signal of the transformer to be tested;
the signal conditioner is used for filtering the winding steady-state pressure signal;
the data acquisition card is used for converting the filtered steady-state pressure signal of the winding into a digital signal;
the industrial personal computer is used for reducing the digital signal into a pressure signal, judging whether the reduced pressure signal exceeds a preset signal threshold range, and obtaining a monitoring result of the transformer to be detected according to a judgment result.
As a further technical scheme, if the transformer to be tested is a three-phase transformer, the number of the pressure sensors is six, and two pressure sensors are mounted on an upper clamp of each phase body of the three-phase transformer.
As a further technical solution, the apparatus further includes: the pressure sensor is installed on the first insulation base, the pressure pin is installed on an upper clamping piece, the pressure pin is fixed with the pressure sensor through bolts, the first insulation base is in contact fit with the first pressing plate, a lead of the pressure sensor is led out of an upper clamping piece on an oil tank of a transformer to be tested, and a wiring flange is reserved on the oil tank.
As a further technical solution, the apparatus further includes: the pressure sensor is arranged at the bottom of the upper clamping piece on the second insulating base, the insulating cushion block used for adjusting the gap is filled between the second insulating base and the second pressing plate, a lead of the pressure sensor is led out of an oil tank of the transformer to be tested along the upper clamping piece, and a wiring flange is reserved on the transformer to be tested.
As a further technical scheme, if the transformer to be tested is a single-phase transformer, the number of the pressure sensors is two, and the two pressure sensors are both arranged on an upper clamping piece of the single-phase transformer.
As a further technical scheme, the industrial personal computer is further configured to determine that the monitoring result of the transformer to be tested is normal if it is determined that the reduced pressure signal does not exceed the preset signal threshold range, perform digital filtering on the reduced pressure signal, convert the filtered pressure signal to obtain a pressure value of the filtered pressure signal, and store the pressure value.
As a further technical scheme, the pressure sensor is a weighing sensor.
As a further technical solution, the signal conditioner is an S3363 signal conditioner.
As a further technical scheme, the type of the data acquisition card is a PC104 data acquisition card.
As a further technical scheme, the industrial personal computer is further used for determining that the monitoring result of the transformer to be tested is abnormal and discarding the reduced pressure signal if the reduced pressure signal is judged to exceed the preset signal threshold range.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: after the scheme is adopted, the function of monitoring the pressure of the winding of the transformer in operation in real time on line is realized, the axial instability of the winding of the transformer can be found in time, effective measures are taken in time, the transformer accidents are reduced, the service life of the transformer is prolonged, the operation reliability of the transformer is improved, the work efficiency of workers is improved, and the safe and stable operation of a power grid is guaranteed.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a transformer winding monitoring device according to an embodiment of the present invention;
FIG. 2 is a schematic layout of a pressure sensor provided by an embodiment of the present invention;
FIG. 3 is a schematic view of a pressure sensor according to an embodiment of the present invention;
fig. 4 is a schematic view of a pressure sensor according to another embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
As shown in fig. 1, a schematic structural diagram of a transformer winding monitoring apparatus is shown, which includes: the pressure sensor 1 is connected with the signal conditioner 2, the signal conditioner 2 is connected with the data acquisition card 3, and the data acquisition card 3 is connected with the industrial personal computer 4;
the pressure sensor 1 is arranged on an upper clamping piece of the transformer to be tested and used for collecting a winding steady-state pressure signal of the transformer to be tested;
the signal conditioner 2 is used for filtering the winding steady-state pressure signal;
the data acquisition card 3 is used for converting the filtered steady-state pressure signal of the winding into a digital signal;
the industrial personal computer 4 is used for reducing the digital signal into a pressure signal, judging whether the reduced pressure signal exceeds a preset signal threshold range, and obtaining a monitoring result of the transformer to be detected according to a judgment result.
Specifically, in order to realize online monitoring of the steady-state pressure of the transformer winding, a hardware platform needs to be designed, and the hardware platform consists of a pressure sensor 1, a signal conditioner 2, a data acquisition card 3 and an industrial personal computer 4, wherein the industrial personal computer 4 is used for reducing a digital signal into a pressure signal and judging whether the reduced pressure signal exceeds a preset signal threshold range, the signal threshold range is set according to the pressure range, preferably, the pressure range is 0-5 tons, the upper threshold is 5 tons, the lower threshold is 0, the data of the reduced pressure signal, which is greater than the upper threshold and less than the lower threshold, is an abnormal pressure signal, and the abnormal pressure signal needs to be discarded after the abnormal pressure signal is acquired and then enters the next acquisition cycle; if the collected and restored pressure signal is greater than 5 tons, or is an abnormal pressure signal less than 0, the pressure signal needs to be collected again after being discarded; if the pressure signal is reduced to 4.5 tons and 0<4.5<5, the pressure of 4.5 tons is the normal signal.
In addition, as shown in fig. 2, in a specific example, if the transformer to be measured is a three-phase transformer, the number of the pressure sensors 1 is six, and two pressure sensors 1 are mounted on the upper clamp 5 of each phase body of the three-phase transformer.
Specifically, in order to increase the service life of the pressure sensor, the housing of the pressure sensor 1 is made of metal, in order to prevent the high-voltage electric field induced metal housing from generating suspension discharge when the pressure sensor 1 operates in a live mode, therefore, the pressure sensor 1 must be installed at the ground potential, for an oil-immersed transformer, the clamping pieces are independently grounded, therefore, the upper clamping piece and the lower clamping piece of the transformer are the ground potential, and meanwhile, in order to consider the convenience of cable extraction, in the scheme, the pressure sensor 1 is installed on the upper clamping piece, different numbers of weighing sensors need to be installed according to whether the transformer is a single-phase or three-phase transformer, for the single-phase transformer, two weighing sensors need to be installed between the upper clamping piece and the pressing plate, for the three-phase transformer, 6 weighing sensors need to be installed altogether, 2 weighing, 3 clamping pieces are respectively arranged on the high-voltage side and the low-voltage side, and 6 weighing sensors are respectively arranged on the ABC three-phase transformer body of the three-phase transformer in the embodiment.
In addition, as shown in fig. 3, in a specific example, the method further includes: the pressure sensor comprises a pressure nail 6, a first pressing plate 7 and a first insulation base 8 used for preventing the pressure sensor 1 from rotating, the pressure sensor 1 is installed on the first insulation base 8, the pressure nail 6 is installed on an upper clamping piece 5, the pressure nail 6 is fixed with the pressure sensor 1 through bolts, the first insulation base 8 is in contact fit with the first pressing plate 7, a lead of the pressure sensor 1 is led out along the upper clamping piece 5 on an oil tank of a transformer to be tested, and a wiring flange is reserved on the oil tank.
Specifically, adopt the transformer that the pressure nail compressed tightly the mode, adopt a dedicated first insulation base 8, pressure sensor 1 passes through the bolt and installs on first insulation base 8, first insulation base 8 possesses the function that prevents pressure sensor 1 rotation, pressure nail 6 is installed on last folder 5, pressure nail 6 and pressure sensor 1 use the bolt fastening, the effect of this bolt is transmission pressure, but prevent that pressure sensor 1 from falling after the transformer axial unstability, first insulation base 8 and first clamp plate 7 direct contact, pressure sensor 1's lead wire is drawn forth on the oil tank of the transformer that awaits measuring along last folder, reserve the flange of working a telephone switchboard on the oil tank.
In addition, as shown in fig. 4, in a specific example, the method further includes: the pressure sensor comprises a second pressing plate 9, an insulating cushion block 10 and a second insulating base 11 used for preventing the pressure sensor from rotating, the pressure sensor 1 is arranged at the bottom of an upper clamping piece 5 on the second insulating base 11, the insulating cushion block 10 used for adjusting gaps is filled between the second insulating base 11 and the second pressing plate 9, a lead of the pressure sensor 1 is led out along the upper clamping piece 5 on an oil tank of a transformer to be tested, and a wiring flange is reserved on the transformer to be tested.
Specifically, adopt the transformer of insulating cushion mode of compressing tightly, adopt a dedicated second insulator foot 11, pressure sensor 1 passes through the bolt and installs on second insulator foot 11, second insulator foot 11 possesses the function that prevents pressure sensor 1 rotation, pressure sensor 1 is fixed in last folder 5 bottom with the bolt, the effect of this bolt is transmission pressure, secondly prevent that pressure sensor 1 axial unstability back sensor from falling, fill insulating cushion 10 between second insulator foot 11 and the second clamp plate 9 for the adjustment clearance. The lead of the pressure sensor 1 is led out to the oil tank of the transformer to be tested along the clamping piece, and a wiring flange is reserved on the oil tank.
In addition, in a specific example, if the transformer to be tested is a single-phase transformer, the number of the pressure sensors is two, and the two pressure sensors are both arranged on the upper clamping piece of the single-phase transformer and are respectively arranged on the upper clamping piece with a high potential and the upper clamping piece with a low potential.
In addition, in a specific example, the industrial personal computer is further configured to determine that the monitoring result of the transformer to be tested is normal if it is determined that the restored pressure signal does not exceed the preset signal threshold range, perform digital filtering on the restored pressure signal, convert, preferably convert, to metric unit newton, the filtered pressure signal, obtain a pressure value of the filtered pressure signal, and store the pressure value for a worker to check.
In addition, in a specific case, the pressure sensor is a weighing sensor, and the weighing sensor is selected to be precise, the protection grade reaches IP68, and the pressure sensor can be soaked in oil for a long time.
In addition, in a specific example, the signal conditioner is the type S3363 signal conditioner, the processing speed is high, the signal conditioning is accurate, and the signal loss rate is low.
In addition, in a specific case, the type of the data acquisition card is a PC104 data acquisition card, 16-bit DA precision, 100KS/s analog quantity output frequency, DV + AV + Audio full-interface video capture card, the perfect combination of quality and performance, SMD chip capacitor, fine workmanship, full-interface board card, integrated stereo input port, no need of switching a sound card, unique Audio co-processing function, two-way stereo input capture, and greatly improved sound quality, the difference of audio and video is avoided, the low-temperature optimization design is adopted, the stability of the capture for a very long time is ensured, a clutter shielding circuit ensures that the image quality of the captured image is clearer, the professional color key image matting function is realized, the film effect is more wonderful, and the full interface is equipped, can catch the material in any video playback equipment, input interface: AV/SVIDEO/DV, video: 720X576/352X288, Audio: 8/16/32/44. 1/48, N/P system, driver, standard DSHOW driver.
In addition, in a specific case, the industrial personal computer is further used for determining that the monitoring result of the transformer to be detected is abnormal if the pressure signal after reduction is judged to exceed the preset signal threshold range, discarding the pressure signal after reduction, collecting and judging again, recording the abnormal monitoring result, storing the abnormal monitoring result in the database, calling and checking by a worker later, and when the transformer breaks down, enabling the worker to quickly and accurately find the problem according to the recorded abnormal monitoring result, shortening the transformer repairing time, improving the efficiency of finding the problem by the worker, and providing great convenience for the worker.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media which may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (8)
1. A transformer winding monitoring device, comprising: the pressure sensor is connected with the signal conditioner, the signal conditioner is connected with the data acquisition card, and the data acquisition card is connected with the industrial personal computer;
the pressure sensor is arranged on an upper clamping piece of the transformer to be tested and used for collecting a winding steady-state pressure signal of the transformer to be tested;
the signal conditioner is used for filtering the winding steady-state pressure signal;
the data acquisition card is used for converting the filtered steady-state pressure signal of the winding into a digital signal;
the industrial personal computer is used for reducing the digital signal into a pressure signal, judging whether the reduced pressure signal exceeds a preset signal threshold range, and obtaining a monitoring result of the transformer to be detected according to a judgment result;
further comprising: the pressure sensor is mounted on the first insulating base, the pressure nail is mounted on an upper clamping piece, the pressure nail and the pressure sensor are fixed through bolts, the first insulating base is in contact fit with the first pressing plate, a lead of the pressure sensor is led out to an oil tank of the transformer to be tested along the upper clamping piece, and a wiring flange is reserved on the oil tank;
the pressure sensor is installed on the first insulating base through bolts.
2. The transformer winding monitoring device according to claim 1, wherein if the transformer to be tested is a three-phase transformer, the number of the pressure sensors is six, and two pressure sensors are mounted on the upper clamping piece of each phase body of the three-phase transformer.
3. The transformer winding monitoring device according to claim 1, wherein if the transformer to be tested is a single-phase transformer, the number of the pressure sensors is two, and both the pressure sensors are disposed on an upper clamp of the single-phase transformer.
4. The transformer winding monitoring device according to claim 1, wherein the industrial personal computer is further configured to determine that the monitoring result of the transformer to be tested is normal if it is determined that the reduced pressure signal does not exceed a preset signal threshold range, perform digital filtering on the reduced pressure signal, convert the filtered pressure signal to obtain a pressure value of the filtered pressure signal, and store the pressure value.
5. The transformer winding monitoring device of claim 1, wherein the pressure sensor is a load cell.
6. The transformer winding monitoring device of claim 1, wherein the signal conditioner is a model S3363 signal conditioner.
7. The transformer winding monitoring device of claim 1, wherein the data acquisition card is a PC104 data acquisition card.
8. The transformer winding monitoring device of claim 1, wherein the industrial personal computer is further configured to determine that the monitoring result of the transformer to be tested is abnormal and discard the reduced pressure signal if it is determined that the reduced pressure signal exceeds a preset signal threshold range.
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| CN201810257732.7A CN108534933B (en) | 2018-03-27 | 2018-03-27 | Transformer winding monitoring device |
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| CN201810257732.7A CN108534933B (en) | 2018-03-27 | 2018-03-27 | Transformer winding monitoring device |
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| CN108534933B true CN108534933B (en) | 2020-12-08 |
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| CN110926673A (en) * | 2019-12-02 | 2020-03-27 | 沈阳变压器研究院股份有限公司 | Device for measuring short circuit force of power transformer |
| CN115343663A (en) * | 2022-08-12 | 2022-11-15 | 保定天威顺达变压器有限公司 | Transformer winding monitoring device |
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|---|---|---|---|---|
| CN1365442A (en) * | 1999-07-28 | 2002-08-21 | Abb专利有限公司 | Device for measuring the contact pressure of a winding press element in an output transformer |
| CN206153888U (en) * | 2016-11-07 | 2017-05-10 | 江苏科瑞恩自动化科技有限公司 | Press tacking equipment |
| CN107014484A (en) * | 2017-05-19 | 2017-08-04 | 广西电网有限责任公司电力科学研究院 | A kind of Transformer Winding thrust experimental rig |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1484034A (en) * | 2002-09-18 | 2004-03-24 | 新疆特变电工股份有限公司 | On-line intelligent monitoring system for transformer and intelligent analysis diagnosis method thereof |
| EP2120317A1 (en) * | 2008-05-14 | 2009-11-18 | ABB Research LTD | A method and a device for determining the mechanical resonant frequency of a vibration mode for a winding package of a transformer |
| CN203551714U (en) * | 2013-10-29 | 2014-04-16 | 国家电网公司 | On-line monitoring system capable of monitoring short-circuit force applied to running transformer |
| CN104236699A (en) * | 2014-10-10 | 2014-12-24 | 天津学子电力设备科技有限公司 | Simulation load vibration test method of transformer |
| CN104377005A (en) * | 2014-11-28 | 2015-02-25 | 苏州市吴中区大陆电子设备厂 | Pressing device |
| CN105300585B (en) * | 2015-10-09 | 2017-12-15 | 河海大学 | A kind of Winding in Power Transformer axial pretightening force monitoring methods based on exciting current |
| CN109477907A (en) * | 2016-05-13 | 2019-03-15 | 天气流公司 | Tactile rain sensor |
| CN106098353B (en) * | 2016-08-18 | 2017-12-01 | 吴江变压器有限公司 | A kind of Transformer Winding pressing device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1365442A (en) * | 1999-07-28 | 2002-08-21 | Abb专利有限公司 | Device for measuring the contact pressure of a winding press element in an output transformer |
| CN206153888U (en) * | 2016-11-07 | 2017-05-10 | 江苏科瑞恩自动化科技有限公司 | Press tacking equipment |
| CN107014484A (en) * | 2017-05-19 | 2017-08-04 | 广西电网有限责任公司电力科学研究院 | A kind of Transformer Winding thrust experimental rig |
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