Insulation aging monitoring device for vegetable oil transformer

Abstract

The invention discloses an insulation aging monitoring device for a vegetable oil transformer. The insulation aging monitoring device comprises a transformer oil tank; a sampling box; the vacuum degassing assembly is communicated with the sampling box; the extraction assembly is communicated with the vacuum degassing assembly; the chromatographic column assembly is communicated with the extraction assembly; the visible light detection assembly is communicated with the chromatographic column assembly; and the control assembly is used for collecting and calculating detection information of the visible light detection assembly and is connected with the visible light detection assembly. By implementing the insulation aging monitoring device for the vegetable oil transformer, the accuracy of evaluating the insulation aging degree of the insulation paper of the transformer can be improved; the structure is simple, and repair and maintenance are convenient.

Description

Technical Field

[0001] The invention relates to the technical field of vegetable oil transformers, and in particular to an insulation aging monitoring device for vegetable oil transformers. Background Art

[0002] Vegetable oil transformers are a type of power transformer that uses natural esters as cooling and insulation media. Compared to traditional mineral oil transformers, vegetable oil transformers are gaining increasing attention due to their superior environmental protection and safety performance.

[0003] The insulating paper in vegetable oil transformers is primarily composed of cellulose. Over time and at rising temperatures, the cellulose undergoes thermal degradation. As the paper ages, its mechanical strength and electrical insulation properties significantly decrease. This makes it more susceptible to partial discharge and breakdown, increasing the risk of short circuits and arc faults. After long-term use, the paper becomes brittle and easily breaks under vibration or other external forces, losing its support and protection for the windings. Aging paper can affect the overall structural stability of the transformer, potentially causing winding displacement or deformation, impacting the transformer's operating condition and safety. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an insulation aging monitoring device for vegetable oil transformers, which can improve the accuracy of evaluating the insulation aging degree of transformer insulation paper; the structure is streamlined and easy to repair and maintain.

[0005] In order to solve the above technical problems, the present invention provides an insulation aging monitoring device for a vegetable oil transformer, comprising: a transformer oil tank; a sampling box detachably connected to the transformer oil tank; a vacuum degassing component for removing moisture and gas from the oil in the sampling box, the vacuum degassing component being connected to the sampling box; an extraction component, the extraction component being connected to the vacuum degassing component; a chromatographic column component for effectively separating the components extracted by the extraction component to separate furfural from other impurities, the chromatographic column component being connected to the extraction component; a visible light detection component for detecting matrix components flowing out of the chromatographic column component, the visible light detection component being connected to the chromatographic column component; a control component for collecting and calculating detection information of the visible light detection component, the control component being connected to the visible light detection component, wherein: the sampling box is connected to the transformer oil tank via an oil pump and a conduit, the conduit comprising a main pipe and multiple branch pipes connected to the main pipe, and the input ends of the multiple branch pipes are placed at different depths of the transformer oil tank.

[0006] The furfural concentration in the matrix component is measured by a visible light detection component and a chromatographic column component, and the control component evaluates the aging degree of the vegetable oil transformer based on the furfural concentration information in the matrix component contained in the detection information.

[0007] The lengths of the multiple branch pipes are set to different levels, and the input ends of the multiple branch pipes are at least placed at the top, middle and bottom of the transformer oil tank for sampling oil at multiple points in the transformer oil tank.

[0008] Among them, the insulation aging monitoring device for vegetable oil transformers as claimed in claim 3 is characterized in that the oil pump is a diaphragm pump, the sampling speed of the oil pump is 200-280ml / min, and the sampling temperature is 30-35°C.

[0009] Among them, the insulation aging monitoring device for vegetable oil transformers as claimed in claim 1 is characterized in that the vacuum degassing component includes: a vacuum pump, a degassing chamber, a pressure sensor and a temperature sensor, and the vacuum pump, the pressure sensor and the temperature sensor are respectively connected to the degassing chamber, wherein: the gas generated in the degassing chamber is extracted by the vacuum pump, and the pressure change in the degassing chamber is monitored by the pressure sensor to achieve ideal degassing conditions; the temperature change in the degassing chamber is monitored by the temperature sensor.

[0010] The extraction component includes: an automatic sampler, an oscillator and a centrifuge, wherein: the automatic sampler, the centrifuge and the oscillator are connected in sequence, and the automatic sampler is connected to the chromatographic column component.

[0011] The method further comprises: a mobile phase injector, which is connected to the chromatographic column assembly; the mobile phase injected by the mobile phase injector is methanol and water, and the volume ratio of methanol to water is 1:1.

[0012] Among them, the chromatographic column component is: C18 column, the column length of the chromatographic column is 250 mm, the particle size is 5 μm, the column temperature is 30-35°C, and the injection volume is 10 μL.

[0013] Among them, the visible light detection component includes a circulation pool, and the insulation aging monitoring device for vegetable oil transformers also includes a waste liquid collection container. The circulation pool is respectively connected to the C18 column and the waste liquid collection container.

[0014] The control component includes: a data acquisition module and a neural network algorithm module connected to the data acquisition module.

[0015] The insulation aging monitoring device for vegetable oil transformers according to the present invention has the following beneficial effects: the insulation aging monitoring device for vegetable oil transformers comprises: a transformer oil tank; a sampling box detachably connected to the transformer oil tank; a vacuum degassing component for removing moisture and gas from the oil in the sampling box, the vacuum degassing component being connected to the sampling box; an extraction component, the extraction component being connected to the vacuum degassing component; a chromatographic column component for effectively separating the components extracted by the extraction component to separate furfural from other impurities, the chromatographic column component being connected to the extraction component The invention relates to a method for manufacturing a transformer oil tank comprising: a sampling box connected to a transformer oil tank through an oil pump and a conduit; a visible light detection component for detecting matrix components flowing out of the chromatographic column component, the visible light detection component being connected to the chromatographic column component; a control component for collecting and calculating detection information of the visible light detection component, the control component being connected to the visible light detection component, wherein: the sampling box is connected to the transformer oil tank through an oil pump and a conduit, the conduit includes a main pipe and multiple branch pipes connected to the main pipe, the input ends of the multiple branch pipes are placed at different depths of the transformer oil tank, which can improve the accuracy of the assessment of the aging degree of the transformer insulation paper; the structure is streamlined and easy to repair and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a structural block diagram of an insulation aging monitoring device for a vegetable oil transformer according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0019] like Figure 1 FIG. 1 shows a first embodiment of the insulation aging monitoring device for vegetable oil transformers according to the present invention.

[0020] The insulation aging monitoring device for vegetable oil transformers in this embodiment includes: a transformer oil tank 1; a sampling box 2 detachably connected to the transformer oil tank 1; a vacuum degassing component 3 for removing moisture and gas from the oil in the sampling box 2, the vacuum degassing component 3 being connected to the sampling box 2; an extraction component 4, the extraction component 4 being connected to the vacuum degassing component 3; a chromatographic column component 5 for effectively separating the components extracted by the extraction component 4 to separate the furfural and other impurities therein, the chromatographic column component 5 being connected to the extraction component 4; a visible light detection component 6 for detecting the matrix components flowing out of the chromatographic column component 5, the visible light detection component 6 being connected to the chromatographic column component 5; and a control component 7 for collecting and calculating detection information of the visible light detection component, the control component 7 being connected to the visible light detection component 6.

[0021] The sampling box 2 is connected to the transformer oil tank 1 through an oil pump and a conduit. The conduit includes a main pipe and multiple branch pipes connected to the main pipe. The input ends of the multiple branch pipes are placed at different depths of the transformer oil tank 1.

[0022] In practice, the oil conditions at different locations in the transformer may vary, and the oil near the hot spots may be more aged. The lengths of the multiple branch pipes are set to different values, and the input ends of the multiple branch pipes are placed at least at the top, middle, and bottom of the transformer tank to sample the oil at multiple points in the transformer tank. This setting serves the following purposes: Traditional sampling methods typically draw oil samples from only one fixed location, which can result in non-representative samples. This is especially true in large transformers, where oil quality can vary significantly at different depths. By setting different branch pipe lengths and adopting a multi-point sampling approach, sampling points are set at different locations on the transformer (such as the top, middle, and bottom). The oil from each point is then mixed and analyzed, or the oil from each point is analyzed separately, to provide a more comprehensive understanding of the transformer's internal insulation aging.

[0023] Preferably, the oil delivery pump is a diaphragm pump, the sampling speed of the oil delivery pump is 200-280 ml / min, and the sampling temperature is 30-35°C.

[0024] The purpose of this setting is that due to the complex composition of transformer oil, which contains a variety of long-chain hydrocarbon molecules and substances such as furfural generated by insulation aging, if the sampling speed is too fast, sampling equipment such as diaphragm pumps will generate large shear stress on the oil. Excessive shear force will destroy the structure of long-chain molecules in the batter. By setting a sampling speed of 200-280mL / min, the damage caused by shear stress to oil molecules can be effectively reduced, ensuring that the content and distribution of components such as furfural in the oil remain relatively stable, so that the test results more accurately reflect the degree of transformer insulation aging. By setting a sampling temperature of 30-35℃, close to the normal operating temperature range of transformer oil, it can effectively slow the thermal decomposition rate of furfural, ensure the relative stability of furfural content in the oil, and thus ensure the accuracy of subsequent test results.

[0025] Furthermore, the function of the vacuum degassing component 3 is to remove moisture and gas from the oil in the sampling box 2. The input end of the vacuum degassing component 3 is connected to the sampling box 2 through the pump body, and the output end of the vacuum degassing component 3 is connected to the input end of the extraction component 4 through the pump body, and the output end of the extraction component 4 is connected to the input end of the chromatographic column component 5.

[0026] Furthermore, the vacuum degassing assembly 3 includes a vacuum pump 31, a degassing chamber 32, a pressure sensor 33, and a temperature sensor 34. The vacuum pump 31, pressure sensor 33, and temperature sensor 34 are each connected to the degassing chamber 32. The vacuum pump 31 extracts gas generated within the degassing chamber 32, while the pressure sensor 33 monitors pressure changes within the degassing chamber 32 to ensure optimal degassing conditions are achieved. The temperature sensor 34 monitors temperature changes within the degassing chamber 32.

[0027] During implementation, an inlet and an outlet can be set on the degassing chamber 32, the inlet of the degassing chamber 32 is connected to the sampling box 2, the outlet of the degassing chamber 32 is connected to the input end of the extraction component 4, and the vacuum pump 31 is connected to the degassing chamber 32, and the vacuum pump 31 extracts the gas generated in the degassing chamber 32 through a pipeline.

[0028] The pressure sensor 33 is used to monitor pressure changes within the degassing chamber to ensure ideal degassing conditions, and the temperature sensor 34 is used to monitor the temperature of the degassing chamber. In this embodiment, a controller for controlling the vacuum pump 31, the pressure sensor 33, and the temperature sensor 34 may also be provided. The controller is electrically connected to the vacuum pump 31, the pressure sensor 33, and the temperature sensor 34.

[0029] Furthermore, the extraction component 4 includes: an automatic sampler 41 , an oscillator 42 and a centrifuge 43 , wherein: the automatic sampler 41 , the centrifuge 43 and the oscillator 42 are connected in sequence, and the automatic sampler 41 is connected to the chromatographic column component 5 .

[0030] The purpose of setting up the chromatographic column component 5 and the visible light detection component 6 is: the chromatographic column component 5 is responsible for separating the various components in the complex transformer oil sample one by one, and the visible light detection component 6 is responsible for real-time detection of each component when it flows out of the chromatographic column. This seamless connection between separation and detection ensures that only the target compound is accurately measured, and other non-target compounds will not interfere with the detection results.

[0031] The furfural concentration in the matrix component is measured by the visible light detection component 6 and the chromatographic column component 5, and the control component 7 can evaluate the aging degree of the vegetable oil transformer based on the furfural concentration information in the matrix component contained in the detection information. For example: this combination can detect extremely low concentrations of furfural, which makes it possible to capture early signs of aging and achieve accurate measurement of trace furfural.

[0032] In this embodiment, the chromatographic column assembly 5 is a C18 column with a column length of 250 mm, a particle size of 5 μm, a column temperature of 30-35°C, and an injection volume of 10 μL. This configuration allows for effective separation of components in a complex matrix through the chromatographic column assembly 5, ensuring separation of furfural from other impurities, thereby improving selectivity.

[0033] Furthermore, the insulation aging monitoring device for vegetable oil transformers also includes: a mobile phase injector 8, which is connected to the chromatographic column assembly 5, and the mobile phase injected by the mobile phase injector 8 is methanol and water, and the volume ratio of methanol to water is 1:1.

[0034] Furthermore, the visible light detection component 6 includes a circulation pool 60, and the insulation aging monitoring device for the vegetable oil transformer also includes a waste liquid collection container 9. The circulation pool 60 is respectively connected to the C18 column and the waste liquid collection container 9.

[0035] Furthermore, the control component includes: a data acquisition module 71 and a neural network algorithm module 72 connected to the data acquisition module 71 .

[0036] During implementation, the data acquisition module 71 collects information from the visible light detection component 6, and the neural network algorithm module 72 is used to obtain the furfural concentration and evaluate the aging degree of the transformer insulation paper.

[0037] The data acquisition module 71 collects information from the visible light detection assembly 6, including the following steps: light emitted by the light source inside the visible light detection assembly 6 passes through the flow cell 60, part of the light source is absorbed by the sample, and the remaining light source reaches the photoelectric sensor and is converted into an electrical signal; the electrical signal is amplified by the preamplifier; the amplified and filtered analog electrical signal needs to be converted into a digital signal by an analog-to-digital converter; the digital signal is transmitted to the neural network algorithm module via the data bus; Obtaining furfural concentration and evaluating the aging degree of transformer insulation paper through the neural network algorithm module 72 includes the following steps: normalizing or standardizing the digital signal to ensure that the scales between different features are consistent and obtain standardized features; checking and cleaning the standardized features for outliers or noise data points to obtain preprocessed feature vectors; using a data set obtained from a standard solution with known furfural concentration to train the neural network model, and testing the performance of the neural network model to obtain a tested neural network model; inputting the preprocessed feature vector into the neural network model to obtain an estimated value of the furfural concentration; establishing a relationship between the furfural concentration and the aging degree of the insulation paper according to industry standards to obtain the aging degree of the transformer insulation paper.

[0038] When this step is implemented, if the furfural concentration is less than 0.2 mg / L, it indicates that the insulation paper is slightly aged. If the furfural concentration is between 0.2 mg / L and 1.0 mg / L, it indicates that the insulation paper has begun to age to a certain extent. If the furfural concentration is greater than 1.0 mg / L, it indicates that the insulation paper has been severely degraded. If the furfural concentration reaches or exceeds 4.0 mg / L, it strongly indicates that the insulation paper is severely aged.

[0039] The insulation aging monitoring device for a vegetable oil transformer in this embodiment has the following beneficial effects: the insulation aging monitoring device for a vegetable oil transformer comprises: a transformer oil tank; a sampling box detachably connected to the transformer oil tank; a vacuum degassing assembly for removing moisture and gas from the oil in the sampling box, the vacuum degassing assembly being connected to the sampling box; an extraction assembly, the extraction assembly being connected to the vacuum degassing assembly; a chromatographic column assembly for effectively separating the components extracted by the extraction assembly to separate furfural from other impurities, the chromatographic column assembly being connected to the extraction assembly a visible light detection component for detecting matrix components flowing out of the chromatographic column component, the visible light detection component being connected to the chromatographic column component; a control component for collecting and calculating detection information of the visible light detection component, the control component being connected to the visible light detection component, wherein: the sampling box is connected to the transformer oil tank through an oil pump and a conduit, the conduit includes a main pipe and multiple branch pipes connected to the main pipe, the input ends of the multiple branch pipes are placed at different depths in the transformer oil tank, which can improve the accuracy of the assessment of the degree of insulation aging of the transformer insulation paper; the structure is streamlined and easy to repair and maintain.

Claims

1. An insulation aging monitoring device for vegetable oil transformers, characterized in that: include: Transformer tank; a sampling box detachably connected to the transformer tank; a vacuum degassing component for removing moisture and gas from the oil in the sampling box, the vacuum degassing component being in communication with the sampling box; an extraction component, the extraction component being in communication with the vacuum degassing component; A chromatographic column component for effectively separating the components extracted by the extraction component, so as to separate the furfural and other impurities therein, wherein the chromatographic column component is connected to the extraction component; a visible light detection component for detecting matrix components flowing out of the chromatographic column component, wherein the visible light detection component is connected to the chromatographic column component; A control component for collecting and calculating detection information of the visible light detection component, wherein the control component is connected to the visible light detection component, wherein: The sampling box is connected to the transformer oil tank through an oil pump and a conduit. The conduit includes a main pipe and multiple branch pipes connected to the main pipe. The input ends of the multiple branch pipes are placed at different depths of the transformer oil tank.

2. The insulation aging monitoring device for vegetable oil transformer according to claim 1, characterized in that: The furfural concentration in the matrix component is measured by the visible light detection component and the chromatographic column component, and the control component evaluates the aging degree of the vegetable oil transformer based on the furfural concentration information in the matrix component contained in the detection information.

3. The insulation aging monitoring device for vegetable oil transformer according to claim 1, characterized in that: The lengths of the multiple branch pipes are set to different levels, and the input ends of the multiple branch pipes are at least placed at the top, middle and bottom of the transformer oil tank for sampling oil at multiple points in the transformer oil tank.

4. The insulation aging monitoring device for vegetable oil transformer according to claim 3, characterized in that: The oil delivery pump is a diaphragm pump, the sampling speed of the oil delivery pump is 200-280 ml / min, and the sampling temperature is 30-35°C.

5. The insulation aging monitoring device for vegetable oil transformer according to claim 1, characterized in that: The vacuum degassing assembly includes: a vacuum pump, a degassing chamber, a pressure sensor and a temperature sensor, wherein the vacuum pump, the pressure sensor and the temperature sensor are respectively connected to the degassing chamber, wherein: The gas generated in the degassing chamber is extracted by the vacuum pump, and the pressure change in the degassing chamber is monitored by the pressure sensor to achieve ideal degassing conditions; the temperature change in the degassing chamber is monitored by the temperature sensor.

6. The insulation aging monitoring device for vegetable oil transformer according to claim 1, characterized in that: The extraction component comprises: an automatic sampler, an oscillator and a centrifuge, wherein: the automatic sampler, the centrifuge and the oscillator are connected in sequence, and the automatic sampler is connected to the chromatographic column component.

7. The insulation aging monitoring device for vegetable oil transformer according to claim 1, characterized in that: Also includes: A mobile phase injector is connected to the chromatographic column assembly, and the mobile phase injected by the mobile phase injector is methanol and water, and the volume ratio of methanol to water is 1:

1.

8. The insulation aging monitoring device for vegetable oil transformer according to claim 1, characterized in that: The chromatographic column assembly is: a C18 column, the column length of the chromatographic column is 250 mm, the particle size is 5 μm, the column temperature is 30-35° C., and the injection volume is 10 μL.

9. The insulation aging monitoring device for vegetable oil transformer according to claim 8, characterized in that: The visible light detection component includes a circulation pool, and the insulation aging monitoring device for the vegetable oil transformer also includes a waste liquid collection container. The circulation pool is respectively connected to the C18 column and the waste liquid collection container.

10. The insulation aging monitoring device for vegetable oil transformer according to claim 1, characterized in that: The control component includes: a data acquisition module and a neural network algorithm module connected to the data acquisition module.

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