CN113629677A - Transformer direct-current magnetic bias suppression method, device, equipment and medium - Google Patents
Transformer direct-current magnetic bias suppression method, device, equipment and medium Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
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Abstract
The invention provides a method, a device, equipment and a medium for suppressing direct current magnetic bias of a transformer. By adopting the embodiment of the invention, the generation type of the direct current magnetic bias current can be judged according to the change rule of the direct current magnetic bias current and the earth potential at the neutral point of the transformer, so that the source of the direct current magnetic bias is determined, and a targeted inhibition measure is further provided.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a method, a device, equipment and a medium for suppressing direct current magnetic bias of a transformer.
Background
With the vigorous development of rail transit, the direct current magnetic biasing phenomenon of urban power grid transformers near subways becomes more obvious, and the safe operation of the transformers and power grid systems is seriously threatened. The domestic and foreign scholars think through extensive research that the direct current magnetic biasing of the transformer near the subway is mainly influenced by the coupling relation between the earth surface potential of the transformer substation and the electromagnetic field between the contact network and the power grid, and the adopted protective measures are different for different sources of the direct current magnetic biasing of the transformer of different transformer substations, so that the source judgment of the direct current magnetic biasing of the transformer becomes an important basis for restraining the direct current magnetic biasing.
However, the inventor finds that the following technical problems exist in the prior art in the process of implementing the invention: at present, the research on the direct current magnetic biasing of the transformer is only limited to judging whether the direct current magnetic biasing current exists, the source of the direct current magnetic biasing of the transformer cannot be effectively researched, and a targeted inhibition measure cannot be provided.
Disclosure of Invention
The invention provides a method, a device, equipment and a medium for suppressing direct current magnetic bias of a transformer, which can further provide a targeted suppression measure according to the source of the direct current magnetic bias.
In order to achieve the above object, an embodiment of the present invention provides a method for suppressing dc magnetic bias of a transformer, including the following steps:
acquiring direct-current magnetic bias current components at a neutral point of the transformer, the potential of the earth grid and the current of each lightning conductor on the power transmission line;
determining the current direction of each lightning conductor on the neutral point of the transformer and the power transmission line according to the potential of the earth screen;
determining the source of the direct-current magnetic bias current according to the current of each lightning conductor and the direct-current magnetic bias current component;
and determining a direct-current magnetic bias suppression strategy corresponding to the source of the direct-current magnetic bias current based on a preset corresponding relation between the direct-current magnetic bias source and the direct-current magnetic bias strategy.
Further, the manner of obtaining the dc bias current component at the neutral point of the transformer is specifically as follows:
and acquiring the ground current at the neutral point of the transformer, and acquiring the direct current magnetic bias current component according to the ground current.
Further, the obtaining of the ground current at the neutral point of the transformer and the obtaining of the dc magnetic bias current component according to the ground current specifically include:
and obtaining the earth current waveform at the neutral point of the transformer according to a preset virtual wave recording instrument, and obtaining the direct current magnetic bias current component according to the earth current waveform.
Further, the determining of the current direction of the neutral point of the transformer and each lightning conductor on the power transmission line according to the ground grid potential specifically includes:
and determining the current direction of the neutral point of the transformer and each lightning conductor on the power transmission line by taking the ground grid potential as a reference object.
Further, the determining a source of the dc magnetic bias current according to the current of each lightning conductor and the dc magnetic bias current component specifically includes:
subtracting the direct-current magnetic bias current component from each lightning conductor current to obtain an earth-entering magnetic bias current corresponding to each lightning conductor;
and comparing the grounding magnetic bias current corresponding to each lightning conductor one by one, and determining the source of the direct current magnetic bias current according to the comparison result.
Further, the determining a dc magnetic bias suppression strategy corresponding to the source of the dc magnetic bias current based on a preset corresponding relationship between the source of the dc magnetic bias and the dc magnetic bias strategy specifically includes:
when the source of the direct current magnetic bias current is judged to be ground coupling, a blocking capacitor is additionally arranged at a neutral point of the transformer;
and when the source of the direct current magnetic bias current is judged to be magnetic coupling, determining a corresponding power transmission line according to the source of the direct current magnetic bias current, and additionally arranging low-pass filtering devices at two ends of the power transmission line.
Another embodiment of the present invention correspondingly provides a transformer dc magnetic bias suppression apparatus, including:
the power grid parameter acquisition module is used for acquiring direct current bias current components at a neutral point of the transformer, the ground grid potential and the current of each lightning conductor on the power transmission line;
the current direction determining module is used for determining the current direction of each lightning conductor on the neutral point of the transformer and the power transmission line according to the ground network potential;
the current source determining module is used for determining the source of the direct-current magnetic bias current according to the current of each lightning conductor and the direct-current magnetic bias current component;
and the direct current magnetic bias suppression module is used for determining a direct current magnetic bias suppression strategy corresponding to the source of the direct current magnetic bias current based on a preset corresponding relation between the direct current magnetic bias source and the direct current magnetic bias strategy.
Another embodiment of the present invention correspondingly provides a terminal device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the transformer dc magnetic bias suppression method according to the above embodiment of the present invention is implemented.
Another embodiment of the present invention provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, where when the computer program runs, a device in which the computer-readable storage medium is located is controlled to execute the method for suppressing dc magnetic bias of a transformer according to the above-described embodiment of the present invention.
Compared with the prior art, the transformer direct-current magnetic bias suppression method, the transformer direct-current magnetic bias suppression device, the transformer direct-current magnetic bias suppression equipment and the transformer direct-current magnetic bias suppression medium provided by the embodiment of the invention solve the problem that in the prior art, direct-current magnetic bias sources cannot be distinguished only by judging whether direct-current magnetic bias current exists or not, and can be used for judging the generation type of the direct-current magnetic bias current according to the change rule of the direct-current magnetic bias current at the neutral point of the transformer and the earth potential so as to determine the source of the direct-current magnetic bias and further provide a targeted suppression measure.
Drawings
Fig. 1 is a schematic flowchart of a method for suppressing dc magnetic bias of a transformer according to an embodiment of the present invention;
fig. 2 is a schematic wiring diagram illustrating a method for measuring an earth current at a neutral point of a transformer according to an embodiment of the present invention;
fig. 3 is a schematic wiring diagram of measuring the earth-grid potential at the neutral point of the transformer in the method for suppressing dc magnetic bias of the transformer according to the embodiment of the present invention;
fig. 4 is a schematic wiring diagram for measuring the current of each lightning conductor on the transmission line in the method for suppressing dc magnetic bias of the transformer according to the embodiment of the present invention;
fig. 5 is a schematic structural diagram of a transformer dc magnetic bias suppression device according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a terminal device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, which is a schematic flow chart of a transformer dc magnetic bias suppression method according to an embodiment of the present invention, the method includes steps S11 to S14:
s11, acquiring direct current bias current components at the neutral point of the transformer, the potential of the earth grid and the current of each lightning conductor on the power transmission line;
s12, determining the current direction of each lightning conductor on the neutral point of the transformer and the power transmission line according to the ground network potential;
s13, determining the source of the direct-current magnetic biasing current according to the current of each lightning conductor and the direct-current magnetic biasing current component;
s14, determining a direct current magnetic bias suppression strategy corresponding to the source of the direct current magnetic bias current based on the preset corresponding relation between the direct current magnetic bias source and the direct current magnetic bias strategy.
It can be understood that when direct current magnetic biasing occurs to the transformer, the vibration of the iron core will be greatly increased, the noise will be gradually enhanced, and resonance is easily generated between a certain harmonic component in the noise and the transformer body or a certain component to aggravate the noise, so that internal structural components are loosened and damaged, and the exciting current is greatly increased at the moment, so that the reactive power consumption is increased, and local overheating of the main transformer is caused. Meanwhile, the iron core direct current magnetic bias can cause the increase of leakage magnetic flux, the waveform is greatly distorted, even harmonics can appear in exciting current, and the transformer becomes an active harmonic source. However, the direct current magnetic bias measurement technology of the transformer is only limited to judging whether the direct current magnetic bias current exists, and because the sources of the direct current magnetic bias are divided into ground potential and electromagnetic induction, and the sources of the direct current magnetic bias of the transformer of different transformer substations are different, the method for detecting the source of the direct current magnetic bias current of the transformer substation is very important.
Compared with the prior art, the transformer direct-current magnetic bias suppression method provided by the embodiment of the invention solves the problem that in the prior art, the direct-current magnetic bias sources cannot be distinguished only by judging whether the direct-current magnetic bias current exists or not, and can be used for judging the generation type of the direct-current magnetic bias current according to the change rule of the direct-current magnetic bias current and the earth potential at the neutral point of the transformer, so as to further determine the source of the direct-current magnetic bias and further provide a targeted suppression measure.
Further, the manner of obtaining the dc bias current component at the neutral point of the transformer is specifically as follows:
and acquiring the ground current at the neutral point of the transformer, and acquiring the direct current magnetic bias current component according to the ground current.
Illustratively, referring to fig. 2, a specific wiring diagram for measuring the ground current of the neutral point of the transformer is shown. The method comprises the steps of firstly clamping a Hall sensor on a neutral point grounding wire of a transformer, then connecting the Hall sensor with a data recorder by using a signal transmission line, then transmitting data measured by the data recorder to a PC (personal computer) through a data line, and finally recording a current waveform through a virtual recorder at the PC end.
For example, the manner of acquiring the earth grid potential at the neutral point of the transformer is specifically as follows:
referring to fig. 3, a specific wiring diagram for measuring the earth potential at the neutral point of the transformer is shown. The potential of the neutral point grounding grid of the transformer substation is measured by leading out a lead-out wire of the transformer grounding grid and then connecting the lead-out wire into a data recorder, transmitting data measured by the data recorder to a PC (personal computer) through a data wire and determining the potential of the neutral point grounding grid of the transformer substation through a virtual wave recorder at the PC end.
For example, the current of each lightning conductor on the power transmission line is obtained by the following specific method:
referring to fig. 4, a specific wiring diagram for measuring the current of each lightning conductor on the power transmission line is shown. The method comprises the steps of firstly clamping a Hall sensor on a lightning conductor leading-out wire of a power transmission line, then connecting the Hall sensor with a data recorder by using a signal transmission line, then transmitting data measured by the data recorder to a PC (personal computer) through a data line, and finally recording current waveforms through a virtual wave recorder at the PC end.
Further, the obtaining of the ground current at the neutral point of the transformer and the obtaining of the dc magnetic bias current component according to the ground current specifically include:
and obtaining the earth current waveform at the neutral point of the transformer according to a preset virtual wave recording instrument, and obtaining the direct current magnetic bias current component according to the earth current waveform.
Further, the determining of the current direction of the neutral point of the transformer and each lightning conductor on the power transmission line according to the ground grid potential specifically includes:
and determining the current direction of the neutral point of the transformer and each lightning conductor on the power transmission line by taking the ground grid potential as a reference object.
Further, the determining a source of the dc magnetic bias current according to the current of each lightning conductor and the dc magnetic bias current component specifically includes:
subtracting the direct-current magnetic bias current component from each lightning conductor current to obtain an earth-entering magnetic bias current corresponding to each lightning conductor;
and comparing the grounding magnetic bias current corresponding to each lightning conductor one by one, and determining the source of the direct current magnetic bias current according to the comparison result.
It can be understood that by comparing these bias currents, the source of the dc bias current can be determined, and the power transmission line whose main source is the dc bias current of the electromagnetic induction can be found out.
Further, the determining a dc magnetic bias suppression strategy corresponding to the source of the dc magnetic bias current based on a preset corresponding relationship between the source of the dc magnetic bias and the dc magnetic bias strategy specifically includes:
when the source of the direct current magnetic bias current is judged to be ground coupling, a blocking capacitor is additionally arranged at a neutral point of the transformer;
and when the source of the direct current magnetic bias current is judged to be magnetic coupling, determining a corresponding power transmission line according to the source of the direct current magnetic bias current, and additionally arranging low-pass filtering devices at two ends of the power transmission line.
It can be understood that if the direct current magnetic bias current source is ground coupling, a blocking capacitor is additionally arranged at a neutral point of the transformer, so that the direct current magnetic bias phenomenon of the transformer in the transformer substation is inhibited; if the source of the direct current bias current is magnetic coupling, a specific power transmission line with the source of the direct current bias current of electromagnetic induction is found out through the step S13, and then the influence of the line electromagnetic induction on the transformer is reduced by additionally arranging low-pass filter devices on the power substations at the two ends of the power transmission line, so that the direct current bias phenomenon of the transformer substation is solved.
It should be noted that if the source is ground coupling, the high-voltage low-pass filter device cannot really cut off the dc bias source, and the treatment effect cannot be achieved. If the source is magnetic coupling, the direct current magnetic bias source cannot be really disconnected by arranging the DC blocking capacitor at the neutral point of the transformer, and only the direct current magnetic bias is led to the next transformer substation, so that the influence range is enlarged.
Referring to fig. 5, a schematic structural diagram of a transformer dc magnetic bias suppression device according to an embodiment of the present invention includes:
a power grid parameter obtaining module 51, configured to obtain a dc magnetic bias current component at a neutral point of the transformer, a ground grid potential, and a current of each lightning conductor on the power transmission line;
the current direction determining module 52 is configured to determine, according to the ground grid potential, a current direction of each of the lightning conductors at the neutral point of the transformer and on the power transmission line;
a current source determining module 53, configured to determine a source of the dc magnetic bias current according to the current of each lightning conductor and the dc magnetic bias current component;
the dc bias suppression module 54 is configured to determine a dc bias suppression strategy corresponding to the source of the dc bias current based on a preset corresponding relationship between the source of the dc bias current and the dc bias strategy.
Compared with the prior art, according to the transformer dc magnetic bias suppression device provided by the embodiment of the present invention, a power grid parameter obtaining module 51 is used to obtain a dc magnetic bias current component at a transformer neutral point, a ground grid potential and a current of each lightning conductor on a power transmission line, a current direction determining module 52 is used to determine a current direction of each lightning conductor on the power transmission line and the transformer neutral point, a current source determining module 53 is used to determine a source of a dc magnetic bias current, and a dc magnetic bias suppression module 54 is used to determine a dc magnetic bias suppression strategy corresponding to the source of the dc magnetic bias current. By adopting the embodiment of the invention, the problem that the sources of the direct current magnetic bias cannot be distinguished only by judging whether the direct current magnetic bias current exists in the prior art is solved, the generation type of the direct current magnetic bias current can be judged according to the change rule of the direct current magnetic bias current and the earth potential at the neutral point of the transformer, and then the sources of the direct current magnetic bias are determined so as to further provide a targeted inhibition measure.
Fig. 6 is a schematic structural diagram of a terminal device according to an embodiment of the present invention. The terminal device 6 of this embodiment includes: a processor 60, a memory 61 and a computer program stored in said memory 61 and executable on said processor 60. The processor 60, when executing the computer program, implements the steps in the above embodiments of the transformer dc magnetic bias suppression method. Alternatively, the processor 60 implements the functions of the modules in the above device embodiments when executing the computer program.
Illustratively, the computer program may be divided into one or more modules, which are stored in the memory 61 and executed by the processor 60 to accomplish the present invention. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program in the terminal device 6.
The terminal device 6 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal device 6 may include, but is not limited to, a processor 60, a memory 61. It will be appreciated by those skilled in the art that the schematic diagram is merely an example of a terminal device and does not constitute a limitation of a terminal device, and may include more or less components than those shown, or combine some components, or different components, for example, the terminal device 6 may further include an input-output device, a network access device, a bus, etc.
The Processor 60 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, and the processor 60 is the control center of the terminal device 6 and connects the various parts of the whole terminal device 6 by various interfaces and lines.
The memory 61 may be used for storing the computer programs and/or modules, and the processor 60 implements various functions of the terminal device 6 by running or executing the computer programs and/or modules stored in the memory 61 and calling data stored in the memory 61. The memory 61 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory 61 may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
Wherein, the module integrated by the terminal device 6 can be stored in a computer readable storage medium if it is implemented in the form of software functional unit and sold or used as a stand-alone product. Based on such understanding, all or part of the flow in the method according to the above embodiments may be implemented by a computer program, which may be stored in a computer readable storage medium and used by the processor 60 to implement the steps of the above embodiments of the method. 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 content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
The embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, and when the computer program runs, a device where the computer-readable storage medium is located is controlled to execute the transformer dc magnetic bias suppression method described above.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (9)
1. A method for suppressing direct current magnetic bias of a transformer is characterized by comprising the following steps:
acquiring direct-current magnetic bias current components at a neutral point of the transformer, the potential of the earth grid and the current of each lightning conductor on the power transmission line;
determining the current direction of each lightning conductor on the neutral point of the transformer and the power transmission line according to the potential of the earth screen;
determining the source of the direct-current magnetic bias current according to the current of each lightning conductor and the direct-current magnetic bias current component;
and determining a direct-current magnetic bias suppression strategy corresponding to the source of the direct-current magnetic bias current based on a preset corresponding relation between the direct-current magnetic bias source and the direct-current magnetic bias strategy.
2. The method for suppressing the direct current bias of the transformer according to claim 1, wherein the direct current bias current component at the neutral point of the transformer is obtained by:
and acquiring the ground current at the neutral point of the transformer, and acquiring the direct current magnetic bias current component according to the ground current.
3. The method for suppressing the direct current magnetic bias of the transformer according to claim 2, wherein the obtaining of the ground current at the neutral point of the transformer and the obtaining of the direct current magnetic bias current component according to the ground current are specifically:
and obtaining the earth current waveform at the neutral point of the transformer according to a preset virtual wave recording instrument, and obtaining the direct current magnetic bias current component according to the earth current waveform.
4. The method for suppressing the direct current magnetic bias of the transformer according to claim 1, wherein the determining of the current direction of the neutral point of the transformer and each lightning conductor on the transmission line according to the ground grid potential specifically comprises:
and determining the current direction of the neutral point of the transformer and each lightning conductor on the power transmission line by taking the ground grid potential as a reference object.
5. The method for suppressing the dc magnetic bias of the transformer according to claim 1, wherein the determining the source of the dc magnetic bias current according to the current of each lightning conductor and the dc magnetic bias current component comprises:
subtracting the direct-current magnetic bias current component from each lightning conductor current to obtain an earth-entering magnetic bias current corresponding to each lightning conductor;
and comparing the grounding magnetic bias current corresponding to each lightning conductor one by one, and determining the source of the direct current magnetic bias current according to the comparison result.
6. The method for suppressing the direct current magnetic bias of the transformer according to claim 1, wherein the determining the direct current magnetic bias suppression strategy corresponding to the source of the direct current magnetic bias current based on a preset corresponding relationship between the source of the direct current magnetic bias and the direct current magnetic bias strategy specifically comprises:
when the source of the direct current magnetic bias current is judged to be ground coupling, a blocking capacitor is additionally arranged at a neutral point of the transformer;
and when the source of the direct current magnetic bias current is judged to be magnetic coupling, determining a corresponding power transmission line according to the source of the direct current magnetic bias current, and additionally arranging low-pass filtering devices at two ends of the power transmission line.
7. A transformer DC magnetic bias suppression device is characterized by comprising:
the power grid parameter acquisition module is used for acquiring direct current bias current components at a neutral point of the transformer, the ground grid potential and the current of each lightning conductor on the power transmission line;
the current direction determining module is used for determining the current direction of each lightning conductor on the neutral point of the transformer and the power transmission line according to the ground network potential;
the current source determining module is used for determining the source of the direct-current magnetic bias current according to the current of each lightning conductor and the direct-current magnetic bias current component;
and the direct current magnetic bias suppression module is used for determining a direct current magnetic bias suppression strategy corresponding to the source of the direct current magnetic bias current based on a preset corresponding relation between the direct current magnetic bias source and the direct current magnetic bias strategy.
8. A terminal device, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the transformer dc bias suppression method according to any one of claims 1 to 6 when executing the computer program.
9. A computer-readable storage medium, comprising a stored computer program, wherein when the computer program runs, the computer-readable storage medium controls an apparatus to execute the method according to any one of claims 1 to 6.
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| CN118508363A (en) * | 2024-07-22 | 2024-08-16 | 国网江西省电力有限公司电力科学研究院 | Attention-based reverse injection DC magnetic bias balance system and method for transformer |
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| JP2000069662A (en) * | 1998-08-20 | 2000-03-03 | Sanyo Electric Works Ltd | Protective circuit for transformer |
| JP2001161024A (en) * | 1999-11-30 | 2001-06-12 | Fuji Electric Co Ltd | Method and device for detecting bias dc magnetization of induction electrical apparatus core |
| EP2698797A2 (en) * | 2012-08-16 | 2014-02-19 | General Electric Company | Apparatus and method for safe state retention |
| JP2017051077A (en) * | 2015-09-04 | 2017-03-09 | 株式会社東芝 | Vehicle control device and vehicle control method |
| CN106253224A (en) * | 2016-10-08 | 2016-12-21 | 安徽正广电电力技术有限公司 | A kind of leading to based on electric capacity hands over every straight D.C. magnetic biasing isolation grounding device |
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|---|---|---|---|---|
| CN118508363A (en) * | 2024-07-22 | 2024-08-16 | 国网江西省电力有限公司电力科学研究院 | Attention-based reverse injection DC magnetic bias balance system and method for transformer |
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