CN220552967U - Transformer degaussing quantization device - Google Patents
Transformer degaussing quantization device Download PDFInfo
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- CN220552967U CN220552967U CN202320238594.4U CN202320238594U CN220552967U CN 220552967 U CN220552967 U CN 220552967U CN 202320238594 U CN202320238594 U CN 202320238594U CN 220552967 U CN220552967 U CN 220552967U
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- 238000013139 quantization Methods 0.000 title claims abstract description 9
- 230000004907 flux Effects 0.000 claims abstract description 35
- 238000001514 detection method Methods 0.000 claims abstract description 23
- 230000003993 interaction Effects 0.000 claims abstract description 22
- 238000002955 isolation Methods 0.000 claims abstract description 10
- 239000011159 matrix material Substances 0.000 claims abstract description 10
- 230000010354 integration Effects 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 6
- 230000005291 magnetic effect Effects 0.000 abstract description 42
- 229920006395 saturated elastomer Polymers 0.000 abstract description 17
- 230000005347 demagnetization Effects 0.000 description 28
- 238000000034 method Methods 0.000 description 15
- 238000012360 testing method Methods 0.000 description 13
- 230000002441 reversible effect Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000005389 magnetism Effects 0.000 description 6
- 238000004804 winding Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
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- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003449 preventive effect Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005520 electrodynamics Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Abstract
The utility model relates to a transformer degaussing quantization device, comprising: the device comprises a shell, a plurality of wiring terminals, a man-machine interaction interface, an intelligent control system and a degaussing power supply; the intelligent control system is arranged in the shell, the wiring terminal and the man-machine interaction interface are both arranged on the shell, the tail end of the wiring terminal penetrates through the shell and is connected with the wiring matrix module in the intelligent control system, and the tail end of the man-machine interaction interface penetrates through the shell and is connected with the main control unit in the intelligent control system; the intelligent control system also comprises a pulse control module, an isolation driving and measuring module, wherein the measuring module comprises a voltage detection module and a current detection module, the residual magnetic value and the real-time magnetic flux value of the transformer are displayed in the human-computer interaction interface, meanwhile, the residual magnetic value is quantized into the percentage of saturated magnetic flux, an operator can set on the control interface according to the requirement, transformer degaussing work is carried out on the transformer, and data such as the magnetic flux value of the transformer are acquired in real time.
Description
Technical Field
The utility model relates to the technical field of electric power, in particular to a transformer degaussing and quantifying device.
Background
According to the preventive test requirement, the DC resistance test of the transformer winding is a test item which is necessary to be carried out after the A, B-level maintenance of the transformer, and the test is generally completed by adopting a high-current constant-current source tester. When the direct current resistance test is performed, residual magnetism is generated in the transformer core and cannot automatically disappear along with the removal of a direct current source, the larger the direct current is applied, the longer the duration is, the more serious the residual magnetism phenomenon is, and in addition, the influence on other preventive test data can be caused to be misjudged. Excitation inrush current phenomenon can occur when a transformer with residual magnetism is closed in an idle load, and the residual magnetism is overlarge, so that the phenomenon can be caused: generating exciting current with higher value and lower second harmonic content to cause differential protection action; the insulation structure is loosened or damaged due to overlarge electrodynamic force caused by magnetic leakage enhancement, and the transformer oil is possibly cracked due to overheating of metal components; the transformer suddenly vibrates, and the oil flow surges to cause heavy gas protection action; the current transformer is excessively magnetized to cause faults such as accuracy reduction and the like. The power transformer operating protocol indicates that: the large power transformer is suitable for demagnetization after the direct current resistance test.
The method for demagnetizing the transformer has been widely studied at home and abroad: the traditional method adopts a low-voltage alternating current method for demagnetization, but cannot completely demagnetize and has overlong demagnetization time. The common method also adopts a direct current reverse impact method for demagnetization, but the magnitude of the demagnetization current, the application time, the demagnetization effect and the like can only be judged empirically, and complete demagnetization cannot be realized. The power plant usually adopts a zero lifting voltage method for demagnetization, but is only suitable for a generator-transformer mode, and the power plant needs to be matched with the power output of a power generation source, so that the limitation is large. At present, direct resistance testing equipment with a demagnetization function is mainly adopted in the engineering, and the demagnetization is poor and the residual magnetic quantity cannot be accurately detected.
Disclosure of Invention
Therefore, the technical problem to be solved by the utility model is to overcome the defects that the existing direct resistance test equipment with the demagnetization function is poor in demagnetization and cannot accurately detect the residual magnetic quantity, so as to provide a transformer demagnetization quantization device and method.
A transformer degaussing quantization apparatus, comprising: the device comprises a shell, a plurality of wiring terminals, a man-machine interaction interface, an intelligent control system and a degaussing power supply, wherein the wiring terminals are used for being connected with a transformer to be tested; the intelligent control system is arranged in the shell, a plurality of wiring terminals and a man-machine interaction interface are arranged on the shell, the tail ends of the wiring terminals penetrate through the shell and are connected with a wiring matrix module in the intelligent control system, and the tail ends of the man-machine interaction interface penetrate through the shell and are connected with a main control unit in the intelligent control system;
the intelligent control system further comprises a pulse control module, an isolation driving and measuring module, the measuring module comprises a voltage detection module and a current detection module, the main control unit is further connected with one end of the pulse control module, the other end of the pulse control module is connected with the isolation driving, the isolation driving is connected with the demagnetizing power supply in parallel, the demagnetizing power supply is connected with the wiring matrix module in parallel, the wiring matrix module is connected with the voltage detection module in parallel, the voltage detection module is connected with the transformer to be measured in parallel, and a down-flow resistor and a sampling resistor are respectively connected in series on two branches of the parallel connection of the voltage detection module and the transformer to be measured; the current detection module is connected with the sampling resistor in parallel and is connected with the main control unit; the voltage detection module is also connected with an integration module in series, and the integration module is also connected with the main control unit.
Further, the demagnetizing power supply adopts a full-bridge inverter circuit.
Further, the device has two modes of operation, an automatic mode and a manual mode, respectively.
Further, the man-machine interaction interface comprises a display and a plurality of keys, and the keys are located on one side of the display.
Further, the display displays the residual magnetic quantity of the transformer, the demagnetizing progress and the real-time magnetic flux curve of the transformer.
Further, a plurality of keys are used for setting the demagnetizing parameters and selecting the device mode.
Further, the degaussing parameters include a maximum degaussing current, a number of degaussing points, and a degaussing power supply voltage.
Further, the voltage of the demagnetizing power supply is 90V.
Further, four terminals are provided, which are respectively denoted as A, B, C and O.
The technical scheme of the utility model has the following advantages:
1. the device can be set on a man-machine interaction interface according to requirements through an intelligent control system, direct-current resistance test and transformer degaussing work are carried out on the transformer, and data such as magnetic flux values of the transformer are collected in real time.
2. In the device, the demagnetizing power supply adopts a full-bridge inverter circuit, and the target current value is preset and monitored in real time through the main control unit, so that the real-time adjustment of the current is realized, and the accuracy of the output current is controlled within +/-0.3%. And when the target current value is reached, the device automatically stops charging, the reverse charging current is modified in real time, reverse charging is carried out, the device is circularly operated until the demagnetization is finished, the demagnetization precision is controlled within +/-0.1%, the residual magnetism of the transformer after the demagnetization is not more than 5% of the saturated magnetic flux, and the transformer is ensured to be demagnetized thoroughly.
3. The device is provided with two modes altogether, realizes automatic and manual conversion control, can be manually converted into manual control to set and select parameters when the automatic working mode does not meet the requirement, and ensures the safety and reliability in the transformer demagnetizing process.
4. The transformer remanence value can be accurately quantized into the percentage of saturated magnetic flux by the device, and when the transformer is demagnetized, staff can intuitively analyze the transformer remanence.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the overall structure of the device of the present utility model;
FIG. 2 is a control schematic diagram of the intelligent control system of the present utility model;
FIG. 3 is a control flow diagram of the apparatus of the present utility model;
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
Referring to fig. 1 and 2, a transformer degaussing and quantifying device includes: the device comprises a shell, a plurality of wiring terminals, a man-machine interaction interface, an intelligent control system and a degaussing power supply, wherein the wiring terminals are used for being connected with a transformer to be tested; the intelligent control system is arranged in the shell, a plurality of wiring terminals and a man-machine interaction interface are arranged on the shell, the tail ends of the wiring terminals penetrate through the shell and are connected with a wiring matrix module in the intelligent control system, and the tail ends of the man-machine interaction interface penetrate through the shell and are connected with a main control unit in the intelligent control system;
the intelligent control system mainly bears tasks of collecting sensor signals, analyzing and calculating, generating control signals, sending instructions and the like, and further comprises a pulse control module, an isolation driving and measuring module, wherein the measuring module comprises a voltage detection module and a current detection module, the main control unit is further connected with one end of the pulse control module, the other end of the pulse control module is connected with the isolation driving, the isolation driving is connected with the demagnetizing power supply in parallel, the demagnetizing power supply is connected with the wiring matrix module in parallel, the wiring matrix module is connected with the voltage detection module in parallel, the voltage detection module is connected with the transformer to be measured in parallel, and a down-flow resistor and a sampling resistor are respectively connected in series on two branches of the voltage detection module and the transformer to be measured in parallel; the current detection module is connected with the sampling resistor in parallel and is connected with the main control unit; the voltage detection module is also connected with an integration module in series, and the integration module is also connected with the main control unit.
The demagnetizing power supply adopts a full-bridge inverter circuit, and because the transformer demagnetizes by applying an alternating direct current source and gradually shrinking a hysteresis loop, the transformer demagnetizing quantization device needs to have the capability of applying forward voltage and reverse voltage, so the full-bridge inverter circuit is adopted in the selection of the demagnetizing power supply, and the requirement of the transformer demagnetizing quantization device for a bidirectional power supply is met. The demagnetizing power supply of the device presets and monitors a target current value in real time through the main control unit, so that real-time adjustment of current is realized, and the accuracy of output current is controlled within +/-0.3%. When the target current value is reached, the device automatically stops charging, the reverse charging current is modified in real time, reverse charging is carried out, the device is circularly operated until the demagnetization is finished, the demagnetization precision is controlled within +/-0.1%, and the residual magnetism of the transformer after the demagnetization is ensured to be not more than 5% of the saturation magnetic flux.
The device has two modes of operation, an automatic mode and a manual mode.
The man-machine interaction interface comprises a display and a plurality of keys, wherein the keys are positioned on one side of the display. The display displays the running states of intelligent systems such as the residual magnetic quantity of the transformer, the degaussing progress, the real-time magnetic flux curve of the transformer and the like. And setting the degaussing parameters by the plurality of keys and selecting the device mode. The degaussing parameters include maximum degaussing current, number of degaussing points, and degaussing supply voltage. The voltage of the demagnetizing power supply is 90V. The wiring terminals are provided with four wiring terminals, which are respectively marked as A, B, C and O.
The device adopts a direct current demagnetizing method, generates an alternating attenuation magnetic field by applying direct current voltage with alternating direction to the transformer, achieves the purpose of demagnetizing, generates corresponding control pulse through the main control unit and drives the full-bridge inverter circuit to work through the pulse control module, and achieves an alternating-current/direct-current source. The main control unit generates corresponding control pulse and drives the full-bridge inverter circuit to work through the pulse control module, constant voltage is applied to the transformer to be tested, the current flowing into the transformer to be tested is gradually increased, when the detected current value reaches a preset target value, the main control unit sends a control signal to drive the full-bridge inverter to work reversely to apply reverse voltage to the transformer, the current target value is modified at the same time, the current flowing into the transformer to be tested is gradually attenuated and increased reversely, and when the detected reverse current value reaches the preset target value, the device applies forward voltage to the transformer again, and the current target value is modified at the same time until the degaussing process is finished. The device calculates real-time magnetic flux of the transformer at any time in the demagnetizing process and displays the magnetic flux through a man-machine interaction interface;
the device adopts a DC source with polarity change to measure the residual magnetic flux of the iron core of the ferromagnetic element, the primary side of the winding on the iron core is open-circuited, and the secondary side is applied with positive and negative DC voltages to enable the iron core to reach positive and negative saturation points respectively, and the exciting current flowing through the winding and the voltages at two ends of the winding in the whole process are recorded. And drawing a change curve of the magnetic flux of the iron core along with the magnetizing current to obtain a partial saturation hysteresis loop of the iron core, and calculating the residual magnetic flux of the iron core according to the obtained hysteresis loop. According to the symmetrical characteristic of the hysteresis curve of the transformer, if the measured transformer core has no remanence, the relation between the positive saturated magnetic flux and the negative saturated magnetic flux should be equal in magnitude and opposite in direction, when the measured transformer core contains remanence, the positive saturated magnetic flux and the negative saturated magnetic flux can deviate correspondingly according to the magnitude and the direction of the remanence, and the positive saturated magnetic flux and the negative saturated magnetic flux do not have the relation with equal magnitude and opposite directions, but the difference between the positive saturated magnetic flux value and the negative saturated magnetic flux value is kept unchanged, so that the residual magnetic flux of the transformer can be quantified according to the symmetry of the transformer magnetic flux curve and the property that the difference between the positive saturated magnetic flux and the negative saturated magnetic flux is unchanged by measuring the positive saturated magnetic flux and the negative saturated magnetic flux.
Referring to fig. 3, the control flow of the present apparatus is as follows:
s1, installing ABC three phases of a tested transformer on a corresponding wiring terminal of the device, installing a neutral point of the tested transformer on an O wiring terminal, inputting the model and the connection group of a test transformer on a man-machine interaction interface, selecting a working mode of equipment, and presetting a demagnetizing current target value and the number of demagnetizing points if a manual mode is selected;
s2, clicking a button on the man-machine interaction interface for correspondingly controlling remanence measurement, starting measuring the remanence of the transformer by the equipment, and displaying a remanence measurement result on the man-machine interaction interface in a saturated magnetic flux percentage mode;
and S3, clicking a button corresponding to the demagnetization function after the measurement of remanence is completed, setting the demagnetization current and the number of demagnetization points, pressing an operation button, starting demagnetization by the equipment, displaying a demagnetization progress bar and a real-time magnetic flux curve of the transformer on a man-machine interaction interface, and displaying the residual magnetic flux after demagnetization and the magnetic flux curve of the transformer in the demagnetization process on the man-machine interaction interface after the demagnetization is completed after the progress bar reaches the maximum.
The transformer degaussing and quantifying device is reasonable in operability, the whole device adopts an integrated machine body design, and the transformer degaussing and quantifying device is compact and light in structure and meets the actual requirements of field equipment. The system adopts digital parameter setting, can preset working parameters (including a direct resistance test current value, a demagnetizing current target value, the number of demagnetizing points and the like), and after the preset parameters are reached, the demagnetizing equipment quantization device can automatically stop working; the maximum working current of the transformer degaussing and quantifying device can ensure the degaussing requirement, and the residual magnetic flux of the transformer after degaussing can be controlled within 5% of the saturated magnetic flux. In the transformer demagnetization process, the output current value can be accurately controlled, and safety and reliability in the test process are ensured.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.
Claims (9)
1. A transformer degaussing quantization apparatus, comprising: the device comprises a shell, a plurality of wiring terminals, a man-machine interaction interface, an intelligent control system and a degaussing power supply, wherein the wiring terminals are used for being connected with a transformer to be tested; the intelligent control system is arranged in the shell, a plurality of wiring terminals and a man-machine interaction interface are arranged on the shell, the tail ends of the wiring terminals penetrate through the shell and are connected with a wiring matrix module in the intelligent control system, and the tail ends of the man-machine interaction interface penetrate through the shell and are connected with a main control unit in the intelligent control system;
the intelligent control system further comprises a pulse control module, an isolation driving and measuring module, the measuring module comprises a voltage detection module and a current detection module, the main control unit is further connected with one end of the pulse control module, the other end of the pulse control module is connected with the isolation driving, the isolation driving is connected with the demagnetizing power supply in parallel, the demagnetizing power supply is connected with the wiring matrix module in parallel, the wiring matrix module is connected with the voltage detection module in parallel, the voltage detection module is connected with the transformer to be measured in parallel, and a down-flow resistor and a sampling resistor are respectively connected in series on two branches of the parallel connection of the voltage detection module and the transformer to be measured; the current detection module is connected with the sampling resistor in parallel and is connected with the main control unit; the voltage detection module is also connected with an integration module in series, and the integration module is also connected with the main control unit.
2. The apparatus of claim 1, wherein the degaussing power supply employs a full bridge inverter circuit.
3. The device of claim 2, wherein the device has two modes of operation, an automatic mode and a manual mode, respectively.
4. The apparatus of claim 3, wherein the human-machine interface comprises a display and a plurality of keys, the plurality of keys being located on one side of the display.
5. The apparatus of claim 4, wherein the display displays a transformer remanence, a degaussing schedule, and a transformer real-time flux profile.
6. The device of claim 5, wherein a plurality of said keys set degaussing parameters and select a device mode.
7. The apparatus of claim 6, wherein the degaussing parameters include a maximum degaussing current, a number of degaussing points, and a degaussing supply voltage.
8. The apparatus of claim 7, wherein the degaussing power supply has a voltage of 90V.
9. The device of claim 8, wherein the terminals are provided in total of four, denoted as A, B, C and O, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320238594.4U CN220552967U (en) | 2023-02-10 | 2023-02-10 | Transformer degaussing quantization device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320238594.4U CN220552967U (en) | 2023-02-10 | 2023-02-10 | Transformer degaussing quantization device |
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| CN220552967U true CN220552967U (en) | 2024-03-01 |
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| CN202320238594.4U Active CN220552967U (en) | 2023-02-10 | 2023-02-10 | Transformer degaussing quantization device |
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- 2023-02-10 CN CN202320238594.4U patent/CN220552967U/en active Active
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