Transformer bushing on-line monitoring method, device and equipment and storage medium

Abstract

The embodiment of the invention discloses a transformer bushing on-line monitoring method, device and equipment and a storage medium. The method comprises the following steps: establishing a basic data curve corresponding to bushing dielectric loss and temperature based on a predelivery test; establishing a mapping relation between the top layer oil temperature and the sleeve body temperature of the operation transformer; obtaining the dielectric loss of the operating transformer, and constructing a relation curve between the dielectric loss of the transformer bushing and the top oil temperature according to the mapping relation between the top oil temperature of the operating transformer and the bushing body temperature; and comparing the relation curve of the dielectric loss of the transformer bushing and the top oil temperature with the basic data curve corresponding to the dielectric loss of the bushing and the temperature, and determining the state of the transformer bushing according to the dielectric loss deviation at the same temperature, so that the influence of the operating temperature change on the online monitoring of the dielectric loss of the transformer bushing can be eliminated. And the on-line monitoring accuracy of the on-site casing pipe is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer monitoring, and in particular to a transformer bushing online monitoring method, device, equipment and storage medium. Background Art

[0002] The bushing is the core component of the transformer. In recent years, there have been many cases of transformer failures caused by bushing failures in the power system, and even transformer fires, causing huge economic losses to the power grid.

[0003] At present, transformer bushing tests are mainly power-off tests with low test voltage and long power-off periods, which cannot reflect the bushing operating status in a timely and accurate manner. The existing bushing online monitoring is easily affected by the ambient temperature. Generally speaking, as the temperature rises, the molecules of the dielectric become more active, the internal friction increases, and the dielectric loss gradually increases, which can lead to misjudgment and increase the amount of on-site operation and maintenance. Summary of the invention

[0004] The main purpose of the present invention is to provide a transformer bushing online monitoring method, device, equipment and storage medium, which can eliminate the influence of operating temperature changes on the transformer bushing dielectric loss online monitoring and improve the accuracy of on-site bushing online monitoring.

[0005] To achieve the above object, the present application provides a transformer bushing online monitoring method, the method comprising:

[0006] Establish the basic data curve of bushing dielectric loss and temperature based on factory test;

[0007] Establish the mapping relationship between the top oil temperature and the bushing body temperature of the operating transformer;

[0008] Obtain the dielectric loss of the operating transformer, and construct a relationship curve between the transformer bushing dielectric loss and the top oil temperature according to the mapping relationship between the top oil temperature of the operating transformer and the bushing body temperature;

[0009] The relationship curve between the transformer bushing dielectric loss and the top oil temperature is compared with the basic data curve corresponding to the bushing dielectric loss and temperature, and the transformer bushing state is determined according to the dielectric loss deviation at the same temperature.

[0010] Optionally, the basic data curve corresponding to bushing dielectric loss and temperature is established based on factory tests, including:

[0011] When the bushing leaves the factory, dielectric loss tests of the bushing are carried out at different temperatures, a curve of bushing dielectric loss changing with temperature is established, and a basic data curve of bushing dielectric loss and temperature is obtained.

[0012] Optionally, the step of establishing a mapping relationship between the top oil temperature of the operating transformer and the bushing body temperature includes:

[0013] Under different ambient temperatures, the top oil temperature of the transformer is read in different time periods and load factors, and the mapping relationship between the top oil temperature of the operating transformer and the temperature of the bushing body is established through infrared temperature measurement of the bushing body:

[0014] T t =kT d

[0015] Among them, T t Indicates the temperature of the casing body, T d It represents the top oil temperature of the transformer, k is the corresponding coefficient between the two, and the k value will change at different temperatures.

[0016] Optionally, comparing the transformer bushing dielectric loss and top oil temperature relationship curve with the basic data curve corresponding to the bushing dielectric loss and temperature, and determining the transformer bushing state according to the dielectric loss deviation at the same temperature, includes:

[0017] When the deviation between the dielectric loss of the corresponding operating bushing and the dielectric loss of the factory test is greater than the preset threshold at the same temperature, it is determined that there is an abnormality in the transformer bushing.

[0018] Optionally, obtaining the dielectric loss of the operating transformer includes:

[0019] Using a bushing dielectric loss online monitoring system to read the dielectric loss of the operating transformer;

[0020] The monitoring method of the casing dielectric loss online monitoring system comprises:

[0021] Install a matching designed end screen signal lead-out device on the end screen tap of the bushing, and install an anti-open circuit protection device to obtain the grounding current signal of the end screen of the bushing;

[0022] The grounding current signal of the end screen of the bushing is introduced into the online monitoring unit through an armored twisted pair shielded cable. The amplitude and phase information of the grounding current signal of the end screen of the bushing are obtained through a core-through current sensor, and the phase difference and amplitude ratio between the grounding current signal and the secondary voltage signal of the PT on the same busbar are obtained, thereby obtaining the capacitance and dielectric loss value of the bushing.

[0023] Optionally, the method further includes:

[0024] According to the law of conservation of energy, the time required for the bushing to reach thermal equilibrium when the ambient temperature changes by 1°C is estimated, and the measurement time point is determined accordingly.

[0025] Optionally, the method further includes:

[0026] Use the transformer's historical operating load information and oil temperature change curve to predict the transformer's remaining life and oil temperature threshold;

[0027] By comparing the actual oil temperature with the oil temperature threshold, the circulating cooling system is controlled to reduce the oil temperature.

[0028] On the other hand, the present application also provides a transformer bushing online monitoring device, comprising:

[0029] The test module is used to establish the basic data curve of bushing dielectric loss and temperature based on factory tests;

[0030] The establishment module is also used to establish a mapping relationship between the top oil temperature and the bushing body temperature of the operating transformer;

[0031] The establishment module is further used to obtain the dielectric loss of the operating transformer, and to construct a relationship curve between the dielectric loss of the transformer bushing and the top oil temperature according to the mapping relationship between the top oil temperature of the operating transformer and the bushing body temperature;

[0032] The monitoring module is used to compare the relationship curve between the transformer bushing dielectric loss and the top oil temperature with the basic data curve corresponding to the bushing dielectric loss and temperature, and determine the transformer bushing status according to the dielectric loss deviation at the same temperature.

[0033] Optionally, the test module is specifically used for:

[0034] When the bushing leaves the factory, dielectric loss tests of the bushing are carried out at different temperatures, a curve of bushing dielectric loss changing with temperature is established, and a basic data curve of bushing dielectric loss and temperature is obtained.

[0035] Optionally, the establishing module is specifically used for:

[0036] Under different ambient temperatures, the top oil temperature of the transformer is read in different time periods and load factors, and the mapping relationship between the top oil temperature of the operating transformer and the temperature of the bushing body is established through infrared temperature measurement of the bushing body:

[0037] T t =kT d

[0038] Among them, T t Indicates the temperature of the casing body, T d It represents the top oil temperature of the transformer, k is the corresponding coefficient between the two, and the k value will change at different temperatures.

[0039] Optionally, the monitoring module is specifically used to:

[0040] When the deviation between the dielectric loss of the corresponding operating bushing and the dielectric loss of the factory test is greater than the preset threshold at the same temperature, it is determined that there is an abnormality in the transformer bushing.

[0041] Optionally, the establishing module is specifically used for:

[0042] Using a bushing dielectric loss online monitoring system to read the dielectric loss of the operating transformer;

[0043] The monitoring method of the casing dielectric loss online monitoring system comprises:

[0044] Install a matching designed end screen signal lead-out device on the end screen tap of the bushing, and install an anti-open circuit protection device to obtain the grounding current signal of the end screen of the bushing;

[0045] The grounding current signal of the end screen of the bushing is introduced into the online monitoring unit through an armored twisted pair shielded cable. The amplitude and phase information of the grounding current signal of the end screen of the bushing are obtained through a core-through current sensor, and the phase difference and amplitude ratio between the grounding current signal and the secondary voltage signal of the PT on the same busbar are obtained, thereby obtaining the capacitance and dielectric loss value of the bushing.

[0046] The establishment module is also used for:

[0047] According to the law of conservation of energy, the time required for the bushing to reach thermal equilibrium when the ambient temperature changes by 1°C is estimated, and the measurement time point is determined accordingly.

[0048] Optionally, the monitoring module is further used to:

[0049] Use the transformer's historical operating load information and oil temperature change curve to predict the transformer's remaining life and oil temperature threshold;

[0050] By comparing the actual oil temperature with the oil temperature threshold, the circulating cooling system is controlled to reduce the oil temperature.

[0051] On the other hand, the present application provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the first aspect and any possible implementation method thereof.

[0052] On the other hand, the present application provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the processor executes each step of the method described in the first aspect.

[0053] The present application provides a transformer bushing online monitoring method, device, equipment and storage medium, by establishing a basic data curve corresponding to bushing dielectric loss and temperature based on factory tests; establishing a mapping relationship between the top oil temperature of the operating transformer and the bushing body temperature; obtaining the dielectric loss of the operating transformer, and constructing a transformer bushing dielectric loss and top oil temperature relationship curve based on the mapping relationship between the top oil temperature of the operating transformer and the bushing body temperature; comparing the transformer bushing dielectric loss and top oil temperature relationship curve with the basic data curve corresponding to the bushing dielectric loss and temperature, and determining the transformer bushing state based on the dielectric loss deviation at the same temperature, which can eliminate the impact of operating temperature changes on the transformer bushing dielectric loss online monitoring, improve the accuracy of on-site bushing online monitoring, and timely grasp the bushing state and prevent and control bushing failures. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0055] in:

[0056] Figure 1 A schematic diagram of a flow chart of a transformer bushing online monitoring method provided in an embodiment of the present application;

[0057] Figure 2 A schematic structural diagram of a transformer bushing online monitoring device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0058] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0059] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0060] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0061] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application.

[0062] See also Figure 1 , is a flow chart of a transformer bushing online monitoring method provided in an embodiment of the present application. Figure 1 As shown, the method includes:

[0063] 101. Establish the basic data curve of bushing dielectric loss and temperature based on factory test.

[0064] The execution subject in the embodiment of the present application may be an online monitoring device for transformer bushings, and in practical applications, it may be implemented by a terminal device.

[0065] This application mainly proposes a method to eliminate the impact of operating temperature changes on the online monitoring of transformer bushing dielectric loss, and proposes solutions to the changes in bushing dielectric loss caused by operating temperature changes, thereby improving the accuracy of on-site bushing online monitoring, which is of great significance for timely grasping the bushing status and preventing and controlling bushing failures.

[0066] The bushing dielectric loss in the embodiment of the present application mainly refers to the dielectric loss factor tanδ (%), which is an effective means to judge the insulation state of the transformer. It is mainly used to check whether the transformer as a whole is damp, whether the insulating oil and paper are deteriorated, whether there is sludge attached to the winding, and whether there are serious local defects.

[0067] Specifically, it is necessary to carry out a dielectric loss test on the bushings leaving the factory, measure the dielectric loss of the bushings at different temperatures, and establish a curve showing the change of the dielectric loss of the bushings with the temperature.

[0068] Usually, a frequency-differential dielectric loss tester, such as the ZTJS-II model, can be used for the test. Optionally, the test wiring method may include:

[0069] Record the ambient temperature and humidity at the test site;

[0070] First, ground the dielectric loss tester to ensure that the wiring is firm and reliable;

[0071] When conducting dielectric loss factor and capacitance tests on high and medium voltage windings against low voltage windings and ground, use bare copper wire to short-circuit the high and medium voltage windings and connect them to the high voltage output terminal of the dielectric loss tester, use bare copper wire to short-circuit the low voltage winding and ground it, and keep the iron core and clamps grounded.

[0072] Furthermore, connect the power input line, check that the test wiring is correct, and the operator can only perform the pressure test after obtaining permission from the test leader. Turn on the power, the instrument enters the self-test, and after the self-test is completed, select the reverse wiring measurement mode. Preset the test voltage, turn on the high voltage permission switch, and press the start button to start the measurement.

[0073] In an optional implementation, the above step 101 includes:

[0074] When the bushing leaves the factory, dielectric loss tests are carried out on the bushing at different temperatures, a curve showing the change of bushing dielectric loss with temperature is established, and the basic data curve showing the change of bushing dielectric loss with temperature is obtained.

[0075] Specifically, when the bushing leaves the factory, dielectric loss tests of the bushing are carried out at different temperatures, and a curve of bushing dielectric loss tanδ corresponding to its temperature (°C) can be established by using interpolation or other methods, that is, the basic data curve corresponding to the above bushing dielectric loss and temperature.

[0076] 102. Establish the mapping relationship between the top oil temperature and the bushing body temperature of the operating transformer.

[0077] Specifically, at different ambient temperatures on site, the top oil temperature can be read through a top oil temperature thermometer that is required for each transformer, and the temperature of the bushing body can be measured to establish a mapping relationship between the top oil temperature of the operating transformer and the temperature of the bushing body.

[0078] In an optional implementation, the above step 102 includes:

[0079] Under different ambient temperatures, the top oil temperature of the transformer is read in different time periods and load factors, and the mapping relationship between the top oil temperature of the operating transformer and the temperature of the bushing body is established through infrared temperature measurement of the bushing body:

[0080] T t =kT d

[0081] Among them, Tt Indicates the temperature of the casing body, T d It represents the top oil temperature of the transformer, k is the corresponding coefficient between the two, and the k value will change at different temperatures.

[0082] In the embodiment of the present application, different mapping relationships between the top oil temperature and the temperature of the bushing body can be established by time period and load factor. Specifically, at different ambient temperatures on site, the top oil temperature is read by the top oil temperature thermometer that must be equipped with each transformer by time period and load factor, and the mapping relationship between the top oil temperature and the temperature of the bushing body of the transformer running on site is established by conducting infrared temperature measurement of the bushing body on site:

[0083] T t =kT d

[0084] T t : casing temperature, T d : Transformer top oil temperature, k is the corresponding coefficient between the two, not a single value. The k value will change at different temperatures. The corresponding coefficient k can be corrected on site based on the measured data.

[0085] For example, in the first temperature range, T t =k 1 T d ; In the second temperature range, T t =k 2 T d , k 1 ≠k 2 , a more flexible and accurate mapping relationship can be established.

[0086] 103. Obtain the dielectric loss of the operating transformer, and construct a relationship curve between the transformer bushing dielectric loss and the top oil temperature according to the mapping relationship between the top oil temperature and the bushing body temperature of the operating transformer.

[0087] The transformer top oil temperature monitoring device can be used to read the top oil temperature of the running transformer, and then the above-mentioned method can be used to convert the top oil temperature of the running transformer into the temperature of the bushing itself; the dielectric loss of the running transformer can be read, and the above-mentioned method of converting the top oil temperature of the transformer into the bushing temperature can be used to construct a relationship curve between the transformer bushing dielectric loss and the transformer top oil temperature.

[0088] Among them, the bushing dielectric loss online monitoring system can be used to read the dielectric loss of the operating transformer.

[0089] In an optional implementation, the transformer bushing dielectric loss online monitoring system is composed of four unit devices: a capacitive bushing online monitoring device, a high- and low-frequency integrated sensor, a bus voltage online monitoring device, and a monitoring host / IED. Specifically, it includes:

[0090] Online monitoring host is used for control of all monitoring units, data management, data storage, data communication, etc.

[0091] Capacitive equipment monitoring device, used to collect the leakage current of capacitive bushing.

[0092] The bus voltage monitoring device is used to collect the three-phase voltage of the bus where the capacitive bushing is located.

[0093] High and low frequency integrated sensor, used for sampling the current at the end screen of capacitive bushing.

[0094] In an optional implementation manner, the obtaining of the dielectric loss of the operating transformer includes:

[0095] Use bushing dielectric loss online monitoring system to read the dielectric loss of the above-mentioned operating transformer;

[0096] The monitoring method of the above-mentioned casing dielectric loss online monitoring system includes:

[0097] Install a matching designed end screen signal lead-out device on the end screen tap of the bushing, and install an anti-open circuit protection device to obtain the grounding current signal of the end screen of the bushing;

[0098] The grounding current signal of the end screen of the above-mentioned bushing is introduced into the online monitoring unit through an armored twisted pair shielded cable. The amplitude and phase information of the grounding current signal of the end screen of the above-mentioned bushing are obtained through a core-through current sensor, and the phase difference and amplitude ratio between the grounding current signal and the secondary voltage signal of the PT on the same busbar are obtained, thereby obtaining the capacitance and dielectric loss value of the bushing.

[0099] The above measurement method has the following technical characteristics:

[0100] Adopt high-precision active sensor, automatically select the amplification factor according to the measured current size to achieve high-precision measurement.

[0101] Dynamic phasor compensation algorithm is used to achieve high-precision measurement signal analysis.

[0102] Adopt digital filtering algorithm to eliminate the "zero drift problem" caused by analog filter.

[0103] A distributed measurement structure is adopted, namely on-site measurement and digital transmission.

[0104] It can be installed under power, which means that the main equipment does not need to be powered off for installation, and the system can be connected conveniently and quickly.

[0105] In an optional implementation, the above method further includes:

[0106] According to the law of conservation of energy, the time required for the bushing to reach thermal equilibrium when the ambient temperature changes by 1°C is estimated, and the measurement time point is determined accordingly.

[0107] Specifically, after the ambient temperature changes, it is necessary to maintain sufficient time for the system heat exchange to reach stability before measuring and recording data. According to the law of conservation of energy, it is possible to estimate the time required for the casing to reach thermal equilibrium when the ambient temperature changes by 1°C, and determine the measurement time accordingly.

[0108] In an optional implementation, the above method further includes:

[0109] Use the transformer's historical operating load information and oil temperature change curve to predict the transformer's remaining life and oil temperature threshold;

[0110] By comparing the actual oil temperature with the above oil temperature threshold, the circulating cooling system is controlled to reduce the oil temperature.

[0111] Specifically, in the embodiment of the present application, historical data and prediction models can be used to further eliminate the impact of temperature changes. The transformer's historical operating load information and oil temperature change curve can be used to predict the transformer's remaining life and oil temperature threshold. By comparing the actual oil temperature with the predicted threshold, the circulating cooling system is controlled to reduce the oil temperature and reduce the impact of temperature changes on dielectric loss monitoring.

[0112] 104. Compare the transformer bushing dielectric loss and top oil temperature relationship curve with the basic data curve corresponding to the bushing dielectric loss and temperature, and determine the transformer bushing state according to the dielectric loss deviation at the same temperature.

[0113] The transformer bushing dielectric loss and top oil temperature relationship curve obtained from on-site testing can be compared with the basic data curve formed in step 101. When the two dielectric losses deviate greatly at the same temperature, it is considered that there is a problem with the transformer bushing, and a reminder can be issued to arrange a power outage inspection as soon as possible.

[0114] In an optional implementation, the above step 104 includes:

[0115] When the deviation between the dielectric loss of the corresponding operating bushing and the dielectric loss of the factory test is greater than the preset threshold at the same temperature, it is determined that there is an abnormality in the transformer bushing.

[0116] At the target temperature, the factory test dielectric loss is determined based on the basic data curve corresponding to the bushing dielectric loss and temperature, and the operating bushing dielectric loss is determined based on the relationship curve between the transformer bushing dielectric loss and the top oil temperature. Among them, the preset threshold can be set or adjusted as needed, for example, 30%. When the deviation between the operating bushing dielectric loss and the factory test dielectric loss is greater than 30% at the same temperature, it is considered that the transformer bushing is abnormal and a power outage inspection can be arranged.

[0117] As a further option, by integrating multiple sensor technologies, such as palladium-nickel alloy hydrogen sensor technology, pressure sensing technology, wide temperature range temperature sensor technology, etc., accurate online monitoring of multiple parameters of the transformer bushing can be achieved, thereby reducing the impact of single factors such as temperature changes on dielectric loss monitoring.

[0118] Based on the description of the aforementioned method embodiment, the embodiment of the present application further discloses a transformer bushing online monitoring device.

[0119] Figure 2 A schematic diagram of the structure of a transformer bushing online monitoring device provided in an embodiment of the present application is shown in FIG. Figure 2 As shown, the transformer bushing online monitoring device 200 may include:

[0120] The test module 210 is used to establish a basic data curve corresponding to the dielectric loss and temperature of the bushing based on the factory test;

[0121] Establishing module 220, further used to establish a mapping relationship between the top oil temperature of the operating transformer and the bushing body temperature;

[0122] The establishment module 220 is further used to obtain the dielectric loss of the operating transformer, and to construct a relationship curve between the dielectric loss of the transformer bushing and the top oil temperature according to the mapping relationship between the top oil temperature of the operating transformer and the bushing body temperature;

[0123] The monitoring module 230 is used to compare the relationship curve between the transformer bushing dielectric loss and the top oil temperature with the basic data curve corresponding to the bushing dielectric loss and temperature, and determine the transformer bushing status according to the dielectric loss deviation at the same temperature.

[0124] Optionally, the test module 210 is specifically used for:

[0125] When the bushing leaves the factory, dielectric loss tests are carried out on the bushing at different temperatures, a curve showing the change of bushing dielectric loss with temperature is established, and the basic data curve showing the change of bushing dielectric loss with temperature is obtained.

[0126] Optionally, the establishment module 220 is specifically used for:

[0127] Under different ambient temperatures, the top oil temperature of the transformer is read in different time periods and load factors, and the mapping relationship between the top oil temperature of the operating transformer and the temperature of the bushing body is established through infrared temperature measurement of the bushing body:

[0128] T t =kT d

[0129] Among them, T t Indicates the temperature of the casing body, T dIt represents the top oil temperature of the transformer, k is the corresponding coefficient between the two, and the k value will change at different temperatures.

[0130] Optionally, the monitoring module 230 is specifically used for:

[0131] When the deviation between the dielectric loss of the corresponding operating bushing and the dielectric loss of the factory test is greater than the preset threshold at the same temperature, it is determined that there is an abnormality in the transformer bushing.

[0132] Optionally, the establishment module 220 is specifically used for:

[0133] Use bushing dielectric loss online monitoring system to read the dielectric loss of the above-mentioned operating transformer;

[0134] The monitoring method of the above-mentioned casing dielectric loss online monitoring system includes:

[0135] Install a matching designed end screen signal lead-out device on the end screen tap of the bushing, and install an anti-open circuit protection device to obtain the grounding current signal of the end screen of the bushing;

[0136] The grounding current signal of the end screen of the above-mentioned bushing is introduced into the online monitoring unit through an armored twisted pair shielded cable. The amplitude and phase information of the grounding current signal of the end screen of the above-mentioned bushing are obtained through a core-through current sensor, and the phase difference and amplitude ratio between the grounding current signal and the secondary voltage signal of the PT on the same busbar are obtained, thereby obtaining the capacitance and dielectric loss value of the bushing.

[0137] The establishment module 220 is further used for:

[0138] According to the law of conservation of energy, the time required for the bushing to reach thermal equilibrium when the ambient temperature changes by 1°C is estimated, and the measurement time point is determined accordingly.

[0139] Optionally, the monitoring module 230 is further used to:

[0140] Use the transformer's historical operating load information and oil temperature change curve to predict the transformer's remaining life and oil temperature threshold;

[0141] By comparing the actual oil temperature with the above oil temperature threshold, the circulating cooling system is controlled to lower the oil temperature and reduce the impact of temperature changes on dielectric loss monitoring.

[0142] It can be understood that the relevant contents of each module in the above device have been described in detail in the aforementioned method embodiment, and the details can be referred to the contents in the method embodiment; that is, the transformer bushing online monitoring device provided in the present application can be executed as follows: Figure 1 Any steps in the illustrated embodiment will not be described in detail here.

[0143] In one embodiment of the present application, an electronic device is also provided. The electronic device may include a processor and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, the execution Figure 1 Any step in the method embodiment shown. The electronic device may also include an input / output device, etc. In a specific implementation, the electronic device may be a terminal device, etc.

[0144] In one embodiment, a computer-readable storage medium is further provided. The computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the processor executes any step in the above method embodiment.

[0145] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0146] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0147] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A transformer bushing online monitoring method, characterized in that: The method comprises: Establish the basic data curve of bushing dielectric loss and temperature based on factory test; Establish the mapping relationship between the top oil temperature and the bushing body temperature of the operating transformer; Obtain the dielectric loss of the operating transformer, and construct a relationship curve between the transformer bushing dielectric loss and the top oil temperature according to the mapping relationship between the top oil temperature of the operating transformer and the bushing body temperature; The relationship curve between the transformer bushing dielectric loss and the top oil temperature is compared with the basic data curve corresponding to the bushing dielectric loss and temperature, and the transformer bushing state is determined according to the dielectric loss deviation at the same temperature.

2. The transformer bushing online monitoring method according to claim 1, characterized in that: The basic data curve corresponding to bushing dielectric loss and temperature established based on factory tests includes: When the bushing leaves the factory, dielectric loss tests of the bushing are carried out at different temperatures, a curve of bushing dielectric loss changing with temperature is established, and a basic data curve of bushing dielectric loss and temperature is obtained.

3. The transformer bushing online monitoring method according to claim 2, characterized in that: The step of establishing a mapping relationship between the top oil temperature of the operating transformer and the bushing body temperature includes: Under different ambient temperatures, the top oil temperature of the transformer is read in different time periods and load factors, and the mapping relationship between the top oil temperature of the operating transformer and the temperature of the bushing body is established through infrared temperature measurement of the bushing body: T t =kT d Among them, T t Indicates the temperature of the casing body, T d It represents the top oil temperature of the transformer, k is the corresponding coefficient between the two, and the k value will change at different temperatures.

4. The transformer bushing online monitoring method according to claim 2, characterized in that: The transformer bushing dielectric loss and top oil temperature relationship curve is compared with the basic data curve corresponding to the bushing dielectric loss and temperature, and the transformer bushing state is determined according to the dielectric loss deviation at the same temperature, including: When the deviation between the dielectric loss of the corresponding operating bushing and the dielectric loss of the factory test is greater than the preset threshold at the same temperature, it is determined that there is an abnormality in the transformer bushing.

5. The transformer bushing online monitoring method according to claim 1, characterized in that: The obtaining of the dielectric loss of the operating transformer includes: Using a bushing dielectric loss online monitoring system to read the dielectric loss of the operating transformer; The monitoring method of the casing dielectric loss online monitoring system comprises: Install a matching designed end screen signal lead-out device on the end screen tap of the bushing, and install an anti-open circuit protection device to obtain the grounding current signal of the end screen of the bushing; The grounding current signal of the end screen of the bushing is introduced into the online monitoring unit through an armored twisted pair shielded cable. The amplitude and phase information of the grounding current signal of the end screen of the bushing are obtained through a core-through current sensor, and the phase difference and amplitude ratio between the grounding current signal and the secondary voltage signal of the PT on the same busbar are obtained, thereby obtaining the capacitance and dielectric loss value of the bushing.

6. The transformer bushing online monitoring method according to claim 2 or 3, characterized in that: The method further comprises: According to the law of conservation of energy, the time required for the bushing to reach thermal equilibrium when the ambient temperature changes by 1°C is estimated, and the measurement time point is determined accordingly.

7. The transformer bushing online monitoring method according to claim 1, characterized in that: The method further comprises: Use the transformer's historical operating load information and oil temperature change curve to predict the transformer's remaining life and oil temperature threshold; By comparing the actual oil temperature with the oil temperature threshold, the circulating cooling system is controlled to reduce the oil temperature.

8. A transformer bushing online monitoring device, characterized in that: include: The test module is used to establish the basic data curve of bushing dielectric loss and temperature based on factory tests; The establishment module is also used to establish a mapping relationship between the top oil temperature and the bushing body temperature of the operating transformer; The establishment module is further used to obtain the dielectric loss of the operating transformer, and to construct a relationship curve between the dielectric loss of the transformer bushing and the top oil temperature according to the mapping relationship between the top oil temperature of the operating transformer and the bushing body temperature; The monitoring module is used to compare the relationship curve between the transformer bushing dielectric loss and the top oil temperature with the basic data curve corresponding to the bushing dielectric loss and temperature, and determine the transformer bushing status according to the dielectric loss deviation at the same temperature.

9. An electronic device, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the processor is caused to perform the steps of the method according to any one of claims 1 to 7.

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