CN118914644B - Transformer overvoltage monitoring method and system and electronic equipment - Google Patents
Transformer overvoltage monitoring method and system and electronic equipment Download PDFInfo
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- CN118914644B CN118914644B CN202410931591.8A CN202410931591A CN118914644B CN 118914644 B CN118914644 B CN 118914644B CN 202410931591 A CN202410931591 A CN 202410931591A CN 118914644 B CN118914644 B CN 118914644B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 40
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 99
- 238000012360 testing method Methods 0.000 claims abstract description 94
- 238000012546 transfer Methods 0.000 claims abstract description 46
- 230000008569 process Effects 0.000 claims abstract description 11
- 230000006870 function Effects 0.000 claims description 57
- 230000004044 response Effects 0.000 claims description 15
- 238000012545 processing Methods 0.000 claims description 14
- 230000009466 transformation Effects 0.000 claims description 11
- 238000004804 winding Methods 0.000 abstract description 12
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000004891 communication Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
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- 230000003862 health status Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- 230000007935 neutral effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a transformer overvoltage monitoring method, a system and electronic equipment, and relates to the technical field of transformer detection. After an iron core signal transfer function of a transformer is determined through a test overvoltage waveform and a test iron core grounding current waveform, the amplitude-frequency characteristic of a voltage signal of the transformer is determined based on the iron core signal transfer function and the iron core grounding current of the transformer in an overvoltage state obtained in the operation process of the transformer, so that the overvoltage waveform received by the transformer is determined, and finally, the overvoltage state of the transformer is obtained based on the overvoltage waveform. Therefore, the problem that misjudgment is easy to occur during the overvoltage monitoring of the transformer because the electromagnetic transformer has low effectiveness on the overvoltage monitoring and cannot show the overall view of the overvoltage of the transformer is solved, and inversion of the overvoltage waveform suffered by the transformer winding by utilizing the iron core grounding current waveform of the transformer in actual operation is realized, so that the accuracy of the overvoltage monitoring of the transformer is improved.
Description
Technical Field
The invention relates to the technical field of transformer detection, in particular to a transformer overvoltage monitoring method, a system and electronic equipment.
Background
Transformers are critical components in power systems, and their health status directly affects the stable operation of the power system. However, when the power transmission line suffers overvoltage, the overvoltage steep wave can be transmitted along the power transmission line, and when the overvoltage reaches the neutral point at the tail end of the step-up transformer coil, full-wave reflection is generated, so that the emission waves are overlapped, the overvoltage suffered by the transformer is doubled, and further, insulation breakdown of the transformer is easily caused, and equipment safety is threatened. Therefore, the overvoltage of the transformer can be found in time, and further loss can be effectively avoided.
At present, the electromagnetic voltage transformer is mainly used for monitoring the system voltage of the equipment, but the electromagnetic transformer has low effectiveness for monitoring the overvoltage, cannot show the overall appearance of the overvoltage of the transformer, and is easy to misjudge.
Disclosure of Invention
The invention aims to provide a transformer overvoltage monitoring method, a system and electronic equipment, which are used for solving the problem that the electromagnetic transformer is low in overvoltage monitoring effectiveness and cannot show the overall view of the transformer overvoltage, so that misjudgment is easy to occur during the transformer overvoltage monitoring, and realizing inversion of overvoltage waveforms suffered by a transformer winding by utilizing the iron core grounding current waveforms of the transformer in actual operation, so that the accuracy of the transformer overvoltage monitoring is improved.
In a first aspect, the present invention provides a method for monitoring overvoltage of a transformer, including:
Acquiring a target current, wherein the target current is an iron core grounding current of the transformer in an overvoltage state in the operation process of the transformer;
determining amplitude-frequency characteristics of a voltage signal of the transformer based on the target current and an iron core signal transfer function of the transformer;
The iron core signal transfer function is determined by a test overvoltage waveform and a test iron core grounding current waveform which are obtained when the overvoltage test is carried out on the transformer;
determining an overvoltage waveform received by the transformer based on the amplitude-frequency characteristic of the voltage signal;
And acquiring an overvoltage state of the transformer based on the overvoltage waveform.
In a preferred embodiment, the obtaining the target current includes:
monitoring the grounding current of an iron core of the transformer;
Determining whether the grounding current of the iron core meets preset conditions, wherein the preset conditions are that the frequency is larger than the preset frequency, the amplitude is larger than the preset amplitude, and the grounding current of the iron core is pulse current;
and taking the iron core grounding current meeting the preset condition as the target current.
In a preferred embodiment, the method for determining the signal transfer function of the core includes:
acquiring the test overvoltage waveform and the test iron core grounding current waveform;
Frequency domain transformation is respectively carried out on the test overvoltage waveform and the test iron core grounding current waveform to obtain test amplitude-frequency characteristics of the test overvoltage waveform and the test iron core grounding current waveform;
Acquiring the frequency response characteristic function of the iron core based on the test amplitude-frequency characteristics of the test overvoltage waveform and the test iron core grounding current waveform;
the core signal transfer function is determined based on the core frequency response characteristic function.
In a preferred embodiment, the determining the amplitude-frequency characteristic of the voltage signal of the transformer based on the target current and the iron core signal transfer function of the transformer includes:
acquiring amplitude-frequency characteristics of the target current based on the target current;
and determining the amplitude-frequency characteristic of the voltage signal of the transformer based on the amplitude-frequency characteristic of the target current and the iron core signal transfer function.
In a preferred embodiment, the determining the waveform of the voltage to which the transformer is subjected based on the amplitude-frequency characteristic of the voltage signal includes:
and performing time domain transformation on the amplitude-frequency characteristic of the voltage signal to obtain the waveform of the voltage received by the transformer.
In a second aspect, the present invention provides a transformer overvoltage monitoring system comprising:
the acquisition unit is used for acquiring target current, wherein the target current is the iron core grounding current of the transformer in an overvoltage state in the operation process of the transformer;
A first processing unit, configured to determine an amplitude-frequency characteristic of a voltage signal of the transformer based on the target current and a core signal transfer function of the transformer;
The iron core signal transfer function is determined by a test overvoltage waveform and a test iron core grounding current waveform which are obtained when the overvoltage test is carried out on the transformer;
the second processing unit is used for determining an overvoltage waveform received by the transformer based on the amplitude-frequency characteristic of the voltage signal;
and the state determining unit is used for acquiring the overvoltage state of the transformer based on the overvoltage waveform.
In a preferred embodiment, the acquisition unit is specifically configured to:
The method comprises the steps of monitoring the iron core grounding current of the transformer, determining whether the iron core grounding current meets preset conditions, wherein the preset conditions comprise that the frequency is larger than the preset frequency, the amplitude is larger than the preset amplitude, the iron core grounding current is pulse current, and the iron core grounding current meeting the preset conditions is used as the target current.
In a preferred embodiment, the transformer overvoltage monitoring system provided by the present invention further includes:
The third processing unit is used for obtaining the test overvoltage waveform and the test iron core grounding current waveform, respectively carrying out frequency domain transformation on the test overvoltage waveform and the test iron core grounding current waveform to obtain test amplitude-frequency characteristics of the test overvoltage waveform and the test iron core grounding current waveform, obtaining the iron core frequency response characteristic function based on the test amplitude-frequency characteristics of the test overvoltage waveform and the test iron core grounding current waveform, and determining the iron core signal transfer function based on the iron core frequency response characteristic function.
In a preferred scheme, the first processing unit is specifically configured to obtain an amplitude-frequency characteristic of the target current based on the target current, and determine an amplitude-frequency characteristic of a voltage signal of the transformer based on the amplitude-frequency characteristic of the target current and the iron core signal transfer function.
In a third aspect, the present invention provides an electronic device comprising:
a processor;
a memory for storing the processor-executable instructions;
The processor is configured to perform the transformer overvoltage monitoring method provided in the first aspect of the present invention.
In order to achieve the above object, according to the method, the system and the electronic device for monitoring the overvoltage of the transformer, the core grounding current of the transformer in an overvoltage state is obtained as a target current in the operation process of the transformer, then the amplitude-frequency characteristic of a voltage signal of the transformer is determined based on the target current and a core signal transfer function, and the core signal transfer function is determined through a test overvoltage waveform and a test core grounding current waveform obtained when the overvoltage test is carried out on the transformer, so that the overvoltage waveform received by the transformer can be determined based on the amplitude-frequency characteristic of the voltage signal after the amplitude-frequency characteristic of the voltage signal of the transformer is determined, and finally the overvoltage state of the transformer is obtained based on the overvoltage waveform. The characteristic that the signal transfer function of the iron core of the same transformer is unchanged is utilized, the overvoltage condition of the transformer is judged by monitoring the voltage waveform of the reverse performance from the iron core grounding current of the transformer when the transformer suffers overvoltage, and then the overvoltage waveform suffered by the wire inlet end of the transformer winding can be observed more intuitively, and the accuracy of monitoring the overvoltage condition suffered by the wire inlet end of the transformer winding is improved.
Drawings
Fig. 1 is a flowchart of a method for monitoring overvoltage of a transformer according to the embodiment of the present invention.
Fig. 2 is a flowchart of a method for determining an iron core signal transfer function from a test overvoltage waveform and a test iron core ground current waveform according to an embodiment of the present invention.
Fig. 3 is a block diagram of a transformer overvoltage monitoring system according to an embodiment of the present invention.
Fig. 4 is a block diagram of another transformer overvoltage monitoring system according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
Currently, the overvoltage condition suffered by a transformer is generally monitored based on a wave recording means. It can be understood that, for the wave recording means of electromagnetic current transformers, voltage transformers and the like, the detection frequency band is low, while the wave recording means of capacitive voltage transformers has poor high-frequency response, and overvoltage can be pre-warned only through abrupt change of signals. Therefore, the situation that the transformer winding wire end bears the overvoltage cannot be reflected truly, namely the overvoltage monitoring is low in effectiveness, and the overall view of the transformer overvoltage cannot be presented.
In order to solve the above problems, the present invention provides a transformer overvoltage monitoring method for monitoring the overvoltage of a transformer winding by measuring the core ground current of the transformer when the transformer suffers overvoltage and inverting the overvoltage waveform suffered by the transformer corresponding to the current waveform.
The transformer overvoltage monitoring method provided by the invention is executed in electronic equipment, wherein the electronic equipment can be a controller of a transformer, can be other controllers independent of the transformer, can also be intelligent terminal equipment such as a notebook computer, a personal computer, a tablet computer and the like which can be communicated with a crane control system, and can also be a server at a network side in certain cases.
As shown in fig. 1, the method for monitoring the overvoltage of the transformer provided by the embodiment of the invention mainly comprises the following steps:
110. and obtaining a target current.
The target current is the obtained iron core grounding current of the transformer in an overvoltage state in the running process of the transformer.
It can be appreciated that the transformers commonly used at present are all provided with iron core grounding copper bars. The working current on the iron core grounding copper bar is the iron core grounding current of the transformer.
Further, in a normal state, the frequency of the core grounding current of the transformer is low, the amplitude is small, and the transformer has periodicity, and when the transformer suffers overvoltage, the frequency of the core grounding current is increased, the amplitude is increased, and the transformer has pulse characteristics.
Based on this, in an alternative embodiment, obtaining the target current includes:
Monitoring the grounding current of an iron core of the transformer;
determining whether the grounding current of the iron core meets the preset condition, wherein the preset condition is that the frequency is larger than the preset frequency, the amplitude is larger than the preset amplitude, and the grounding current of the iron core is pulse current;
and taking the iron core grounding current meeting the preset condition as a target current.
The preset frequency and the preset amplitude are preset based on experience, experiment, or the like, and are not particularly limited herein. In this embodiment, during the operation of the transformer, the working current on the iron core grounding copper bar of the transformer may be induced by the current transformer, and then the controller is connected with the current transformer in a communication manner, so as to achieve the acquisition of the target current of the transformer by the controller.
120. The amplitude-frequency characteristic of the voltage signal of the transformer is determined based on the target current and the core signal transfer function of the transformer.
The iron core signal transfer function is determined by a test overvoltage waveform and a test iron core grounding current waveform obtained when the overvoltage test is performed on the transformer.
In particular, the core signal transfer function of the same transformer is unchanged. Based on the above, after the iron core signal transfer function of the transformer is determined based on the test overvoltage waveform and the test iron core grounding current waveform obtained when the overvoltage test is performed on the transformer to be monitored, the amplitude-frequency characteristic of the voltage signal of the transformer can be obtained by combining the obtained target current of the transformer and the iron core signal transfer function of the transformer in the actual operation process of the transformer.
In an alternative embodiment, a method for determining a core signal transfer function from a test overvoltage waveform and a test core ground current waveform obtained when an overvoltage test is performed on a transformer is specifically described, namely, as shown in fig. 2, comprising the steps of:
210. Acquiring a test overvoltage waveform and a test iron core grounding current waveform;
220. frequency domain transformation is respectively carried out on the test overvoltage waveform and the test iron core grounding current waveform to obtain test amplitude-frequency characteristics of the test overvoltage waveform and the test iron core grounding current waveform;
230. Acquiring an iron core frequency response characteristic function based on the test amplitude-frequency characteristics of the test overvoltage waveform and the test iron core grounding current waveform;
240. the core signal transfer function is determined based on the core frequency response characteristic function.
In this embodiment, by performing an overvoltage test on a transformer to be monitored for overvoltage, an overvoltage waveform U (t) suffered by a transformer winding and a core grounding current waveform I (t) of the transformer may be measured and recorded during the test.
Further, by performing frequency domain transformation on the overvoltage waveform U (t) suffered by the transformer winding and the core grounding current waveform I (t) of the transformer, the amplitude-frequency characteristic U (w) of the overvoltage waveform U (t) suffered by the transformer winding and the amplitude-frequency characteristic I (w) of the core grounding current waveform I (t) of the transformer can be obtained, respectively.
Further, the core frequency response characteristic function G (w) as shown in the formula (1) can be calculated based on the amplitude-frequency characteristics U (w) and I (w):
G(w)=I(w)/U(w) (1)
Finally, the core signal transfer function G(s) can be calculated from the core frequency response characteristic curve G (w):
G(s)=1/G(w) (2)
I.e., the core signal transfer function G(s) is determined by the amplitude-frequency characteristics of the overvoltage waveform and the core ground current waveform of the transformer when subjected to overvoltage. However, during operation of the transformer, the controller obtains the core ground current of the transformer, rather than the amplitude-frequency characteristics of the core ground current waveform. When determining the voltage signal received by the transformer based on the core grounding current, the amplitude-frequency characteristic of the core grounding current needs to be determined first.
Based on this, in an alternative embodiment, a method of determining the amplitude-frequency characteristics of a voltage signal of a transformer based on a target current and a core signal transfer function of the transformer is specifically described, namely:
Acquiring amplitude-frequency characteristics of the target current based on the target current;
the amplitude-frequency characteristic of the voltage signal of the transformer is determined based on the amplitude-frequency characteristic of the target current and the core signal transfer function.
In this embodiment, in the operation process of the transformer, the obtained target current If (t) of the transformer is converted into the amplitude-frequency characteristic If (w) of the target current, and then the amplitude-frequency characteristic If (w) of the voltage signal received by the transformer can be obtained by calculating the core signal transfer function G(s) by taking the obtained target current If (t) as input and inputting the core signal transfer function G(s).
130. The overvoltage waveform to which the transformer is subjected is determined based on the amplitude-frequency characteristic of the voltage signal.
Specifically, after the amplitude-frequency characteristic Uf (w) of the voltage signal of the transformer is determined based on the iron core signal transfer function G(s) and the target current If (t) in the running process of the transformer, the overvoltage waveform Uf (t) received by the transformer can be obtained based on inversion of the amplitude-frequency characteristic Uf (w) of the voltage signal.
140. Based on the overvoltage waveform, an overvoltage condition of the transformer is obtained.
In an alternative embodiment, a method of determining the waveform of the voltage to which the transformer is subjected based on the amplitude-frequency characteristics of the voltage signal is specifically described, namely:
and performing time domain transformation on the amplitude-frequency characteristic of the voltage signal to obtain an overvoltage waveform received by the transformer.
According to the transformer overvoltage monitoring method provided by the embodiment of the invention, based on the characteristic that the iron core signal transfer function of the same transformer is unchanged, after the iron core signal transfer function of the transformer is determined based on the overvoltage test on the transformer, the port overvoltage of the transformer winding is inverted by utilizing the working current on the iron core grounding copper bar, compared with the current common wave recording means, the overvoltage waveform suffered by the inlet wire end of the transformer winding can be observed more intuitively, and therefore the judgment of the overvoltage condition of the port of the transformer is facilitated, namely the accurate monitoring of the overvoltage of the transformer winding by utilizing the high-frequency signal of the iron core grounding current of the transformer is realized.
The following description will be made with reference to the transformer overvoltage monitoring system provided by the embodiment of the present invention, and the transformer overvoltage monitoring system described below may be regarded as a module architecture for implementing the transformer overvoltage monitoring method provided by the embodiment of the present invention, and the following description may be referred to above.
Optionally, referring to fig. 3, fig. 3 is a block diagram of a transformer overvoltage monitoring system according to an embodiment of the present invention, where the system may include:
The acquisition unit 10 is used for acquiring a target current, wherein the target current is an iron core grounding current of the acquired transformer in an overvoltage state in the running process of the transformer;
a first processing unit 20 for determining an amplitude-frequency characteristic of a voltage signal of the transformer based on the target current and a core signal transfer function of the transformer;
The iron core signal transfer function is determined by a test overvoltage waveform and a test iron core grounding current waveform which are obtained when the overvoltage test is carried out on the transformer;
A second processing unit 30 that determines an overvoltage waveform to which the transformer is subjected based on the amplitude-frequency characteristic of the voltage signal;
the state determining unit 40 is configured to obtain an overvoltage state of the transformer based on the overvoltage waveform.
Optionally, the collecting unit 10 is specifically configured to:
the method comprises the steps of monitoring the iron core grounding current of the transformer, determining whether the iron core grounding current meets preset conditions, wherein the preset conditions comprise that the frequency is larger than the preset frequency, the amplitude is larger than the preset amplitude and the iron core grounding current meets the preset conditions is pulse current, and the iron core grounding current meeting the preset conditions is used as target current.
Optionally, referring to fig. 4, fig. 4 is a block diagram illustrating a structure of another transformer overvoltage monitoring system according to an embodiment of the present invention, and on the basis of the embodiment shown in fig. 3, the system further includes:
The third processing unit 50 is configured to obtain a test overvoltage waveform and a test core grounding current waveform, perform frequency domain transformation on the test overvoltage waveform and the test core grounding current waveform to obtain test amplitude-frequency characteristics of the test overvoltage waveform and the test core grounding current waveform, and obtain a core frequency response characteristic function based on the test amplitude-frequency characteristics of the test overvoltage waveform and the test core grounding current waveform.
Optionally, the first processing unit 20 is specifically configured to obtain an amplitude-frequency characteristic of the core grounding current based on the core grounding current, determine an amplitude-frequency characteristic of a voltage signal of the transformer based on the amplitude-frequency characteristic of the core grounding current and the core signal transfer function, and determine the core signal transfer function based on the core frequency response characteristic function.
Optionally, the second processing unit 30 is specifically configured to perform time domain transformation on the amplitude-frequency characteristic of the voltage signal, so as to obtain a waveform of the voltage received by the transformer.
An electronic device provided by an embodiment of the present application is described below with reference to fig. 5, and may include at least one processor 100, at least one communication interface 200, at least one memory 300, and at least one communication bus 400;
In the embodiment of the present invention, the number of the processor 100, the communication interface 200, the memory 300 and the communication bus 400 is at least one, and the processor 100, the communication interface 200 and the memory 300 complete the communication with each other through the communication bus 400;
Alternatively, the communication interface 200 may be an interface of a communication module, such as a GSM module, and the processor 100 may be a central processing unit CPU, or an Application-specific integrated Circuit ASIC (Application SPECIFIC INTEGRATED Circuit), or one or more integrated circuits configured to implement embodiments of the present invention.
Memory 300 may comprise high-speed RAM memory or may further comprise non-volatile memory (non-volatile memory), such as at least one disk memory.
The processor 100 is specifically configured to execute an application program in the memory, so as to implement the steps of the crane hoisting steel wire rope installation control method.
The foregoing examples are provided for clarity 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 invention.
Claims (8)
1. A method for monitoring overvoltage of a transformer, comprising:
Acquiring a target current, wherein the target current is an iron core grounding current of the transformer in an overvoltage state in the operation process of the transformer;
Determining amplitude-frequency characteristics of a voltage signal of the transformer based on the target current and an iron core signal transfer function of the transformer, wherein the iron core signal transfer function is determined by a test overvoltage waveform and a test iron core grounding current waveform obtained when the transformer is subjected to an overvoltage test;
determining an overvoltage waveform received by the transformer based on the amplitude-frequency characteristic of the voltage signal;
acquiring an overvoltage state of the transformer based on the overvoltage waveform;
The method for determining the iron core signal transfer function comprises the following steps:
acquiring the test overvoltage waveform and the test iron core grounding current waveform;
Frequency domain transformation is respectively carried out on the test overvoltage waveform and the test iron core grounding current waveform to obtain test amplitude-frequency characteristics of the test overvoltage waveform and the test iron core grounding current waveform;
acquiring an iron core frequency response characteristic function based on the test amplitude-frequency characteristics of the test overvoltage waveform and the test iron core grounding current waveform;
the core signal transfer function is determined based on the core frequency response characteristic function.
2. The method of claim 1, wherein the obtaining the target current comprises:
Determining whether the grounding current of the iron core of the transformer meets preset conditions, wherein the preset conditions are that the frequency is larger than the preset frequency, the amplitude is larger than the preset amplitude, and the grounding current is pulse current;
and taking the iron core grounding current meeting the preset condition as the target current.
3. The method of claim 1, wherein determining the amplitude-frequency characteristic of the voltage signal of the transformer based on the target current and a core signal transfer function of the transformer comprises:
acquiring amplitude-frequency characteristics of the target current based on the target current;
and determining the amplitude-frequency characteristic of the voltage signal of the transformer based on the amplitude-frequency characteristic of the target current and the iron core signal transfer function.
4. The method of claim 1, wherein determining an overvoltage waveform to which the transformer is subjected based on an amplitude-frequency characteristic of the voltage signal comprises:
and performing time domain transformation on the amplitude-frequency characteristic of the voltage signal to obtain an overvoltage waveform received by the transformer.
5. A transformer overvoltage monitoring system, comprising:
the acquisition unit is used for acquiring target current, wherein the target current is the iron core grounding current of the transformer in an overvoltage state in the operation process of the transformer;
A first processing unit, configured to determine an amplitude-frequency characteristic of a voltage signal of the transformer based on the target current and an iron core signal transfer function of the transformer, and determine the iron core signal transfer function based on an iron core frequency response characteristic function;
The iron core signal transfer function is determined by a test overvoltage waveform and a test iron core grounding current waveform which are obtained when the overvoltage test is carried out on the transformer;
the second processing unit is used for determining an overvoltage waveform received by the transformer based on the amplitude-frequency characteristic of the voltage signal;
A state determining unit, configured to obtain an overvoltage state of the transformer based on the overvoltage waveform;
Wherein the system further comprises:
The third processing unit is used for obtaining the test overvoltage waveform and the test iron core grounding current waveform, performing frequency domain transformation on the test overvoltage waveform and the test iron core grounding current waveform respectively to obtain test amplitude-frequency characteristics of the test overvoltage waveform and the test iron core grounding current waveform, and obtaining the iron core frequency response characteristic function based on the test amplitude-frequency characteristics of the test overvoltage waveform and the test iron core grounding current waveform.
6. The transformer overvoltage monitoring system according to claim 5, wherein the acquisition unit is specifically configured to:
The method comprises the steps of monitoring the iron core grounding current of the transformer, determining whether the iron core grounding current meets preset conditions, wherein the preset conditions comprise that the frequency is larger than the preset frequency, the amplitude is larger than the preset amplitude, the iron core grounding current is pulse current, and the iron core grounding current meeting the preset conditions is used as the target current.
7. The system of claim 5, wherein the first processing unit is configured to obtain an amplitude-frequency characteristic of the target current based on the target current, and determine an amplitude-frequency characteristic of a voltage signal of the transformer based on the amplitude-frequency characteristic of the target current and the core signal transfer function.
8. An electronic device, the electronic device comprising:
a processor;
a memory for storing the processor-executable instructions;
the processor for performing the transformer overvoltage monitoring method according to any of the preceding claims 1 to 4.
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| KR101958296B1 (en) * | 2012-09-20 | 2019-03-15 | 한국전력공사 | Apparatus for diagnosing a transformer and method for the same |
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| WO2020125090A1 (en) * | 2018-12-20 | 2020-06-25 | 国网上海市电力公司 | Transformer monitoring system and method |
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