CN112735788A - Method and device for monitoring winding of oil-immersed power transformer - Google Patents
Method and device for monitoring winding of oil-immersed power transformer Download PDFInfo
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- CN112735788A CN112735788A CN202011528319.3A CN202011528319A CN112735788A CN 112735788 A CN112735788 A CN 112735788A CN 202011528319 A CN202011528319 A CN 202011528319A CN 112735788 A CN112735788 A CN 112735788A
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- optical fiber
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
Abstract
The application discloses a method and a device for monitoring a winding of an oil-immersed power transformer, wherein the method comprises the following steps: respectively acquiring a group of output signals of a first distributed optical fiber pressure sensor, a second distributed optical fiber pressure sensor and a third distributed optical fiber pressure sensor at the moment i; judging whether the variation of two continuous sampling points in one group of output signals is larger than a preset threshold value or not in the three groups of output signals; if the judgment result is negative, outputting a recording signal, wherein the recording signal is obtained output signals of each group; if the judgment result is yes, respectively acquiring a group of output signals of the first distributed optical fiber pressure sensor, the second distributed optical fiber pressure sensor and the third distributed optical fiber pressure sensor at the moment i +1, and executing a subsequent judgment step; and when the (i + m) th judgment result is yes, outputting a tripping signal, wherein m is more than or equal to 1. The stress change condition of the bottom of the winding can be timely and accurately reflected, and the on-site main transformer winding state evaluation and fault diagnosis can be favorably carried out.
Description
Technical Field
The application relates to the technical field of transformer monitoring, in particular to a method and a device for monitoring a winding of an oil-immersed power transformer.
Background
Because the production process has the conditions of dispersion or bearing the through current in operation, and the like, the supporting bars between the bottom of the winding and the iron core of the oil-immersed power transformer have the dislocation problem, so that the bearing area of the bottom of the winding is small, and the risk of short circuit fault caused by winding instability and winding bottom turn-to-turn insulation damage exists.
The bottom stress distribution condition of the transformer winding is known in time, and corresponding control measures are taken, so that the safe and stable operation of equipment can be ensured, and the power supply reliability of a power system is improved. At present, most methods for detecting the winding state of an oil-immersed power transformer are power failure detection methods, such as a frequency response method, a low-voltage short-circuit impedance method and the like, on-site power failure needs to execute procedures, and the winding state detection cannot be performed due to the fact that power failure cannot be performed timely; and the condition of large deformation or displacement of the winding can be reflected, and the condition of missing historical detection data or large time span of the in-phase winding is difficult to accurately evaluate the winding state.
Disclosure of Invention
In view of this, the present application aims to provide a method for monitoring a winding of an oil-immersed power transformer, which can accurately reflect the stress change condition of the bottom of the winding in time, and is beneficial to on-site performing state evaluation and fault diagnosis of a main transformer winding.
In order to achieve the above technical objective, the present application provides a method for monitoring a winding of an oil-immersed power transformer, which is applied to an oil-immersed power transformer having a first distributed optical fiber pressure sensor pre-embedded in a lower gasket of a three-phase high-voltage winding, a second distributed optical fiber pressure sensor pre-embedded in a lower gasket of a three-phase medium-voltage winding, and a third distributed optical fiber pressure sensor pre-embedded in a lower gasket of a three-phase low-voltage winding, and includes:
respectively acquiring a group of output signals of a first distributed optical fiber pressure sensor, a second distributed optical fiber pressure sensor and a third distributed optical fiber pressure sensor at the moment i;
judging whether the variation of two continuous sampling points in one group of output signals is larger than a preset threshold value or not in the three groups of output signals;
if the judgment result is negative, outputting a recording signal, wherein the recording signal is the acquired output signals of each group;
if the judgment result is yes, respectively acquiring a group of output signals of the first distributed optical fiber pressure sensor, the second distributed optical fiber pressure sensor and the third distributed optical fiber pressure sensor at the moment i +1, and executing a subsequent judgment step;
and when the (i + m) th judgment result is yes, outputting a tripping signal, wherein m is more than or equal to 1.
Further, still include:
and when the judgment result of the (i + m-n) th time is yes, outputting an alarm signal, respectively obtaining a group of output signals of the first distributed optical fiber pressure sensor, the second distributed optical fiber pressure sensor and the third distributed optical fiber pressure sensor at the moment of i + m-n +1, and executing a subsequent judgment step, wherein n is less than m, and m is more than or equal to 2.
Further, when the i + m-th judgment result is also yes, outputting a trip signal specifically includes:
and when the third judgment result is yes, outputting a trip signal.
Further, when the i + m-n th judgment result is yes, outputting an alarm signal specifically includes:
and when the second judgment result is yes, outputting an alarm signal.
Further, if the determination result is negative, outputting the recording signal specifically includes:
if the judgment result is negative, outputting a recording signal to the historical database.
Oil-immersed power transformer winding monitoring devices includes:
the acquisition unit is used for respectively acquiring a group of output signals of the first distributed optical fiber pressure sensor, the second distributed optical fiber pressure sensor and the third distributed optical fiber pressure sensor at the moment i;
the judging unit is used for judging whether the variation of two continuous sampling points in one group of output signals is larger than a preset threshold value or not in the three groups of output signals;
the acquiring unit is further configured to acquire a group of output signals of the first distributed optical fiber pressure sensor, the second distributed optical fiber pressure sensor and the third distributed optical fiber pressure sensor at the moment i +1, respectively, when the determination result is yes;
the output unit is used for outputting a recording signal when the judgment result is negative;
and the output unit is also used for outputting a tripping signal when the (i + m) th judgment result is yes.
Furthermore, the output unit is also used for outputting an alarm signal when the (i + m-n) th judgment result is yes, wherein n is less than m, and m is more than or equal to 2;
the obtaining unit is further configured to obtain a respective set of output signals of the first distributed optical fiber pressure sensor, the second distributed optical fiber pressure sensor and the third distributed optical fiber pressure sensor at the moment i + m-n +1, respectively, when the i + m-n th judgment result is yes.
Further, the output unit is specifically configured to output a trip signal when the third determination result is yes.
Further, the output unit is specifically configured to output an alarm signal when the second determination result is yes.
Further, the output unit is specifically configured to output a recording signal to the history database when the determination result is negative.
According to the technical scheme, the monitoring method is applied to the oil-immersed power transformer with the first distributed optical fiber pressure sensor pre-embedded in the lower gasket of the three-phase high-voltage winding, the second distributed optical fiber pressure sensor pre-embedded in the lower gasket of the three-phase medium-voltage winding and the third distributed optical fiber pressure sensor pre-embedded in the lower gasket of the three-phase low-voltage winding, and the implementation mode is simple and reliable. Respectively acquiring a group of output signals of a first distributed optical fiber pressure sensor, a second distributed optical fiber pressure sensor and a third distributed optical fiber pressure sensor at the moment i, judging whether only one group of continuous two sampling point variable quantities in the output signals are larger than a preset threshold value or not in the three groups of output signals, outputting a recording signal when the judgment result is negative, acquiring each group of output signals at the next moment when the judgment result is positive, judging again, and outputting a tripping signal until the judgment result is positive for the (i + m) th time. According to the method, the stress condition of the bottom of the winding of the oil-immersed power transformer is monitored through the distributed optical fiber pressure sensor, the pressure values of two continuous sampling points are compared and judged in real time, and compared with electric quantity measurement, the method adopts non-electric quantity transmission signals, is more suitable for a strong electromagnetic environment, can timely monitor and feed back the state of a main transformer, and is beneficial to carrying out operation and maintenance of power equipment on site, standardizing equipment purchasing and bidding, and ensuring stable operation of a power system.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a flowchart of a first embodiment of a method for monitoring a winding of an oil-immersed power transformer provided in the present application;
fig. 2 is a flowchart of a second embodiment of a method for monitoring a winding of an oil-immersed power transformer provided in the present application;
fig. 3 is a flowchart of a specific application example of the oil-immersed power transformer winding monitoring method provided in the present application;
fig. 4 is a block flow diagram of an oil-immersed power transformer winding monitoring device provided in the present application;
FIG. 5 is a schematic structural diagram of a distributed optical fiber pressure sensor embedded in a lower gasket of a winding of an oil-immersed transformer;
in the figure: 1. a lower gasket; 100. a distributed fiber optic pressure sensor; a. an acquisition unit; b. a judgment unit; c. and an output unit.
Detailed Description
The technical solutions of the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the embodiments in the present application.
In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the embodiments of the present application. 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 embodiments of the present application, it should be noted that the terms "mounted," "connected," and "connected" are used broadly and are defined as, for example, a fixed connection, an exchangeable connection, an integrated connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements, unless otherwise explicitly stated or limited. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.
The embodiment of the application discloses a method for monitoring a winding of an oil-immersed power transformer, which is applied to the oil-immersed power transformer with a first distributed optical fiber pressure sensor pre-buried in a gasket under a three-phase high-voltage winding, a second distributed optical fiber pressure sensor pre-buried in a gasket under a three-phase medium-voltage winding and a third distributed optical fiber pressure sensor pre-buried in a gasket under a three-phase low-voltage winding. The embedded position of the distributed optical fiber pressure sensor 100 in each lower gasket 1 may be, for example, as shown in fig. 5, embedded between the inner gasket and the outer gasket of the lower gasket 1, and those skilled in the art can make appropriate changes based on this, and are not limited in particular.
Referring to fig. 1, an embodiment of a method for monitoring a winding of an oil-immersed power transformer provided in an embodiment of the present application includes:
and S1, respectively acquiring a group of output signals of the first distributed optical fiber pressure sensor, the second distributed optical fiber pressure sensor and the third distributed optical fiber pressure sensor at the moment i. It should be noted that the time i is the ith time slice, the time length is divided into a plurality of time slices, for example, each hour is divided into 12 time slices, and each time slice is 5 minutes. The time i is the ith 5 minutes, and those skilled in the art can make appropriate changes based on this, without limitation. In the present application, i is a non-zero natural number.
And S2, judging whether the variation of only two continuous sampling points in one group of output signals is larger than a preset threshold value in the three groups of output signals. It should be noted that, a set of output signals of the first distributed optical fiber pressure sensor obtained at time i may be denoted as D1, a set of output signals of the second distributed optical fiber pressure sensor may be denoted as D2, and a set of output signals of the third distributed optical fiber pressure sensor may be denoted as D3. Then, the variation of two consecutive sampling points in the corresponding D1 can be denoted as Δ D10, the variation of two consecutive sampling points in the corresponding D2 can be denoted as Δ D20, the variation of two consecutive sampling points in the corresponding D3 can be denoted as Δ D30, and the preset threshold can be denoted as Δ D0, which can be obtained according to aspects such as historical experience summary, and the like, without any limitation. Comparing the delta D10, the delta D10 and the delta D30 with the delta D0 respectively, and further judging whether the variation of two continuous sampling points in one group of output signals is larger than a preset threshold value.
And S3, if the judgment result is negative, outputting a recording signal, wherein the recording signal is the acquired output signals of each group. It should be noted that when the variation of two consecutive sampling points in the two, three or zero groups of output signals is greater than the preset threshold, the determination result is determined as no, and at this time, the recording signal can be directly output.
And S4, if the judgment result is yes, respectively acquiring a group of output signals of the first distributed optical fiber pressure sensor, the second distributed optical fiber pressure sensor and the third distributed optical fiber pressure sensor at the moment i +1, and executing subsequent judgment steps. It should be noted that, when it is determined that the variation of two consecutive sampling points in only one group of output signals is greater than the preset threshold, the output signal at the next moment is obtained, and the determination is continued.
S5, when the (i + m) th judgment result is yes, a trip signal is output, wherein m is larger than or equal to 1. It should be noted that, when the i + m times of continuous judgment result is yes, the judgment result can be regarded as an abnormality of the transformer winding, and at this time, a trip signal can be output to the control terminal to control the transformer to trip. Wherein m is also a non-zero natural number.
According to the technical scheme, the monitoring method is applied to the oil-immersed power transformer with the first distributed optical fiber pressure sensor pre-embedded in the lower gasket of the three-phase high-voltage winding, the second distributed optical fiber pressure sensor pre-embedded in the lower gasket of the three-phase medium-voltage winding and the third distributed optical fiber pressure sensor pre-embedded in the lower gasket of the three-phase low-voltage winding, and the implementation mode is simple and reliable. The method comprises the steps of respectively obtaining a group of output signals of a first distributed optical fiber pressure sensor, a second distributed optical fiber pressure sensor and a third distributed optical fiber pressure sensor at the moment i, judging whether the variation of two continuous sampling points in one group of output signals is larger than a preset threshold value or not in the three groups of output signals, outputting a recording signal when the judgment result is negative, obtaining each group of output signals at the next moment when the judgment result is positive, judging again, and outputting a tripping signal until the judgment result is positive for the (i + m) th time. According to the method, the stress condition of the bottom of the winding of the oil-immersed power transformer is monitored through the distributed optical fiber pressure sensor, the pressure values of two continuous sampling points are compared and judged in real time, and compared with electric quantity measurement, the method adopts non-electric quantity transmission signals, is more suitable for a strong electromagnetic environment, can timely monitor and feed back the state of a main transformer, and is beneficial to carrying out operation and maintenance of power equipment on site, standardizing equipment purchasing and bidding, and ensuring stable operation of a power system.
The above is a first embodiment of the method for monitoring the winding of the oil-immersed power transformer provided by the embodiment of the present application, and the following is a second embodiment of the method for monitoring the winding of the oil-immersed power transformer provided by the embodiment of the present application, please refer to fig. 2 and fig. 3 specifically.
The monitoring method based on the first embodiment comprises the following steps:
further comprising:
s6, when the judgment result of the (i + m-n) th time is yes, outputting an alarm signal, respectively obtaining a group of output signals of the first distributed optical fiber pressure sensor, the second distributed optical fiber pressure sensor and the third distributed optical fiber pressure sensor at the i + m-n +1 moment, and executing a subsequent judgment step, wherein n is less than m, m is more than or equal to 2, and n is also a non-zero natural number. It should be noted that, when the result of the (i + m-n) th time is yes, that is, when the result of the previous n times of judgment of outputting the trip signal is reached, it may be judged that the transformer winding is abnormal, and at this time, when the output signal is obtained again, an alarm signal may also be output to the control terminal to control the corresponding alarm device, which may be, for example, a buzzer or the like to give an alarm. The values of m and n can be determined according to the actual situation, and are not limited. For example, when the third judgment result is yes, a trip signal can be output. And when the second judgment result is yes, outputting an alarm signal.
Further, if the judgment result is negative, a recording signal is specifically output to the historical database. Compared with a winding off-line test method, the method can timely store historical data of the pressure at the bottom of the transformer winding, is beneficial to accurately evaluating the pressure change state at the bottom of the transformer winding, and is convenient for on-site operation and maintenance.
The specific application judgment process may be as shown in fig. 3:
acquiring variation quantities delta D10, delta D20 and delta D30 of two continuous sampling points in a group of output signals of the first distributed optical fiber pressure sensor, the second distributed optical fiber pressure sensor and the third distributed optical fiber pressure sensor;
judging whether the conversion quantity of only one group of output signals in the three groups of output signals is larger than a preset threshold value delta D0;
if not, outputting a recording signal to the historical database, wherein the recording signal is D10, D20 and D30;
if yes, acquiring variation quantities delta D10 ', ' delta D20 ' and ' delta D30 ' of two continuous sampling points in a group of output signals of the first distributed optical fiber pressure sensor, the second distributed optical fiber pressure sensor and the third distributed optical fiber pressure sensor in a subsequent time interval delta t;
judging whether the conversion quantity of only one group of output signals in the three groups of output signals is larger than a preset threshold value delta D0;
if not, outputting a recording signal to the historical database, wherein the recording signal is D10 ', D20 ' or D30 ';
if yes, outputting an alarm signal, and acquiring variation quantity delta D10 ', delta D20 ', delta D30 ' of two continuous sampling points in each group of output signals of the first distributed optical fiber pressure sensor, the second distributed optical fiber pressure sensor and the third distributed optical fiber pressure sensor in a subsequent event interval delta t;
judging whether the conversion quantity of only one group of output signals in the three groups of output signals is larger than a preset threshold value delta D0;
if not, outputting a recording signal to the historical database, wherein the recording signal is D10 ', D20 ', D30 ';
if yes, a tripping signal is output.
As shown in fig. 4, the present application further discloses an oil-immersed power transformer winding monitoring device, including: the acquisition unit a is used for respectively acquiring a group of output signals of the first distributed optical fiber pressure sensor, the second distributed optical fiber pressure sensor and the third distributed optical fiber pressure sensor at the moment i; the judging unit b is used for judging whether the variation of two continuous sampling points in one group of output signals is larger than a preset threshold value or not in the three groups of output signals; the acquisition unit a is further configured to, when the determination result is yes, respectively acquire a group of output signals of the first distributed optical fiber pressure sensor, the second distributed optical fiber pressure sensor, and the third distributed optical fiber pressure sensor at the moment i + 1; an output unit c for outputting a recording signal when the judgment result is negative; and the output unit c is also used for outputting a tripping signal when the judgment result of the (i + m) th time is yes. Specifically, the acquiring unit a, the determining unit b, and the outputting unit c may be integrated into a logic determining module, which has acquiring, determining, and outputting functions, and is not limited specifically.
Furthermore, the output unit c is also used for outputting an alarm signal when the judgment result of the (i + m-n) th time is yes, wherein n is less than m, and m is more than or equal to 2; and the obtaining unit a is further configured to obtain a respective group of output signals of the first distributed optical fiber pressure sensor, the second distributed optical fiber pressure sensor and the third distributed optical fiber pressure sensor at the moment i + m-n +1 when the i + m-n th judgment result is yes.
Further, the output unit c is specifically configured to output the trip signal when the third determination result is yes.
Further, the output unit c is specifically configured to output an alarm signal when the second determination result is yes.
Further, the output unit c is specifically configured to output a recording signal to the history database when the determination result is negative.
In summary, the present disclosure should not be construed as limiting the present disclosure, and the embodiments and the application scope of the present disclosure may be modified by those skilled in the art according to the concepts of the present disclosure.
Claims (10)
1. The method for monitoring the winding of the oil-immersed power transformer is characterized by being applied to the oil-immersed power transformer with a first distributed optical fiber pressure sensor pre-embedded in a gasket under a three-phase high-voltage winding, a second distributed optical fiber pressure sensor pre-embedded in a gasket under a three-phase medium-voltage winding and a third distributed optical fiber pressure sensor pre-embedded in a gasket under a three-phase low-voltage winding, and comprises the following steps:
respectively acquiring a group of output signals of a first distributed optical fiber pressure sensor, a second distributed optical fiber pressure sensor and a third distributed optical fiber pressure sensor at the moment i;
judging whether the variation of two continuous sampling points in one group of output signals is larger than a preset threshold value or not in the three groups of output signals;
if the judgment result is negative, outputting a recording signal, wherein the recording signal is the acquired output signals of each group;
if the judgment result is yes, respectively acquiring a group of output signals of the first distributed optical fiber pressure sensor, the second distributed optical fiber pressure sensor and the third distributed optical fiber pressure sensor at the moment i +1, and executing a subsequent judgment step;
and when the (i + m) th judgment result is yes, outputting a tripping signal, wherein m is more than or equal to 1.
2. The oil-filled power transformer winding monitoring method according to claim 1, characterized by further comprising:
and when the judgment result of the (i + m-n) th time is yes, outputting an alarm signal, respectively obtaining a group of output signals of the first distributed optical fiber pressure sensor, the second distributed optical fiber pressure sensor and the third distributed optical fiber pressure sensor at the moment of i + m-n +1, and executing a subsequent judgment step, wherein n is less than m, and m is more than or equal to 2.
3. The oil-filled power transformer winding monitoring method according to claim 2, wherein when the i + m times judgment result is also yes, the outputting of the trip signal specifically comprises:
and when the third judgment result is yes, outputting a trip signal.
4. The oil-filled power transformer winding monitoring method according to claim 3, wherein when the i + m-n times judgment result is yes, outputting an alarm signal specifically comprises:
and when the second judgment result is yes, outputting an alarm signal.
5. The oil-filled power transformer winding monitoring method according to claim 1, wherein if the judgment result is negative, outputting a recording signal specifically comprises:
if the judgment result is negative, outputting a recording signal to the historical database.
6. Oil-immersed power transformer winding monitoring devices, its characterized in that includes:
the acquisition unit is used for respectively acquiring a group of output signals of the first distributed optical fiber pressure sensor, the second distributed optical fiber pressure sensor and the third distributed optical fiber pressure sensor at the moment i;
the judging unit is used for judging whether the variation of two continuous sampling points in one group of output signals is larger than a preset threshold value or not in the three groups of output signals;
the acquiring unit is further configured to acquire a group of output signals of the first distributed optical fiber pressure sensor, the second distributed optical fiber pressure sensor and the third distributed optical fiber pressure sensor at the moment i +1, respectively, when the determination result is yes;
the output unit is used for outputting a recording signal when the judgment result is negative;
and the output unit is also used for outputting a tripping signal when the (i + m) th judgment result is yes.
7. The oil-immersed power transformer winding monitoring device according to claim 6, wherein the output unit is further configured to output an alarm signal when the i + m-n times of judgment result is yes, where n is less than m, and m is greater than or equal to 2;
the obtaining unit is further configured to obtain a respective set of output signals of the first distributed optical fiber pressure sensor, the second distributed optical fiber pressure sensor and the third distributed optical fiber pressure sensor at the moment i + m-n +1, respectively, when the i + m-n th judgment result is yes.
8. The oil-filled power transformer winding monitoring device according to claim 7, wherein the output unit is specifically configured to output a trip signal when the third determination result is yes.
9. The oil-filled power transformer winding monitoring device according to claim 8, wherein the output unit is specifically configured to output an alarm signal when the second determination result is yes.
10. The oil-filled power transformer winding monitoring device according to claim 6, wherein the output unit is specifically configured to output a recording signal to a historical database when the determination result is negative.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011528319.3A CN112735788A (en) | 2020-12-22 | 2020-12-22 | Method and device for monitoring winding of oil-immersed power transformer |
| CN202111564923.6A CN114420429A (en) | 2020-12-22 | 2021-12-20 | Method and device for monitoring winding of oil-immersed power transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011528319.3A CN112735788A (en) | 2020-12-22 | 2020-12-22 | Method and device for monitoring winding of oil-immersed power transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112735788A true CN112735788A (en) | 2021-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011528319.3A Withdrawn CN112735788A (en) | 2020-12-22 | 2020-12-22 | Method and device for monitoring winding of oil-immersed power transformer |
| CN202111564923.6A Pending CN114420429A (en) | 2020-12-22 | 2021-12-20 | Method and device for monitoring winding of oil-immersed power transformer |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111564923.6A Pending CN114420429A (en) | 2020-12-22 | 2021-12-20 | Method and device for monitoring winding of oil-immersed power transformer |
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| Country | Link |
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| CN (2) | CN112735788A (en) |
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2020
- 2020-12-22 CN CN202011528319.3A patent/CN112735788A/en not_active Withdrawn
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