A transformer overheating fault reverse push device and working method

Abstract

The present invention relates to a transformer overheating fault reverse thrust device, comprising a transparent shell that is scaled down according to the oil volume specification of the simulated transformer, a simulated oil pillow, insulating oil filled in the transparent shell and the simulated oil pillow, a plurality of variable area overheating generating devices, an online chromatographic instrument, and a control module; the upper, middle, and lower positions of the side wall of the transparent shell are respectively installed with an upper oil sampling port, a middle oil sampling port, and a lower oil sampling port, and each oil sampling port is respectively connected to a four-way conversion valve of the online chromatographic instrument; the upper, middle, and lower positions inside the transparent shell are all installed with variable area overheating generating devices, and the variable area overheating generating devices are electrically connected to the control module; the simulated oil pillow is installed on the upper part of the transparent shell and connected to the transparent shell through a connecting pipe, and a refueling port is installed on the upper part of the simulated oil pillow. The present invention well overcomes the deficiencies and shortcomings of the traditional online chromatographic detection of overheating faults of large power transformers, and can be used as practical simulation training for professionals.

Description

Technical Field

[0001] The invention relates to a transformer overheat fault reverse estimation device and a working method, and belongs to the field of large-scale power transformer online gas chromatography detection transformer overheat fault device. Background Art

[0002] During the operation of the transformer, overheating faults may sometimes occur inside. When overheating faults occur, they are divided into low-temperature, medium-temperature and high-temperature overheating faults according to the degree of heat generated at the overheating fault. Generally, the heating temperature of 150℃-300℃ is called low-temperature overheating fault, 300℃-700℃ is called medium-temperature overheating fault, and over 700℃ is called high-temperature overheating fault. The insulating oil around the fault point is pyrolyzed due to the increase in temperature at the fault point, producing pyrolysis gas. When a low-temperature overheating fault occurs, these gases are mainly: hydrogen, carbon monoxide, carbon dioxide, methane, ethane, and a small amount of ethylene. As the temperature of the heating fault increases, the insulation oil The pyrolysis trend of unsaturated hydrocarbon components in the oil also increases. When the high temperature fault reaches 700℃ or above, in addition to the increase in pyrolysis of the double-bond unsaturated hydrocarbon ethylene, the triple-bond unsaturated hydrocarbon acetylene components in the insulating oil also begin to release a small amount of pyrolysis. The above gases produced by exothermic pyrolysis: hydrogen, carbon monoxide, carbon dioxide, methane, ethane, ethylene, and acetylene are collectively referred to as transformer overheating fault characteristic gases, referred to as characteristic gases. Normally operating transformers have low internal temperatures, so the content of characteristic gases is very small. Although the characteristic gases will increase slightly with the increase in the operating period, the increase is very small and has a certain regularity, especially the unsaturated hydrocarbon components are even less. Under the same conditions, the larger the fault heating area, the more the rate and total amount of characteristic gas produced. The higher the heating temperature, in addition to the increase in the characteristic gas production rate, the content of unsaturated hydrocarbon gas components also rises rapidly. In transformer operation, the gas chromatography instrument is used to determine the proportion of each component content of characteristic gas in insulating oil, the gas production rate, and the comparison with historical data to analyze and judge the severity, scope and development trend of overheating fault. The oil samples are taken from different sampling ports to analyze the different concentration differences and roughly judge the location of overheating fault. In traditional operation, the transformer is a steel shell, and its interior cannot be observed. When an overheating fault occurs inside the transformer, its overheating process, overheating phenomenon, overheating area, thermal decomposition of insulating oil around the overheating fault, and the gas production rate of overheating fault gas are all unknown. The fault location, fault development degree, heating area, and gas production rate can only be roughly judged by accumulating chromatographic instrument test data, which often leads to misjudgment or overjudgment. The present invention overcomes the insufficiencies and shortcomings of the traditional large-scale power transformer overheating fault online chromatographic detection, and can be used as practical simulation training for professionals, which is of great significance. Summary of the invention

[0003] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a transformer overheating fault reverse estimation device and a working method.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: a transformer overheating fault reverse thrust device, comprising a transparent shell that is proportionally reduced in size to simulate the oil volume specifications of the transformer, a simulated oil pillow, insulating oil filled in the transparent shell and the simulated oil pillow, a number of variable area overheating generating devices, an online chromatograph, and a control module; an upper oil sampling port, a middle oil sampling port and a lower oil sampling port are respectively installed at the upper, middle and lower positions of the side wall of the transparent shell, and each oil sampling port is respectively connected to a four-way conversion valve of the online chromatograph; variable area overheating generating devices are installed at the upper, middle and lower positions inside the transparent shell, and the variable area overheating generating devices are electrically connected to the control module; the simulated oil pillow is installed at the upper part of the transparent shell and is connected to the transparent shell through a connecting pipe, and a refueling port is installed at the upper part of the simulated oil pillow, and insulating oil is added to the simulated oil pillow through the refueling port, and the insulating oil in the simulated oil pillow flows into the transparent shell through the connecting pipe.

[0005] Preferably, the variable area overheating generating device includes two electric heating plates, both of which are rectangular electric heating elements of the same size, one of which is a fixed heating plate, and the other is a movable heating plate that can be moved left and right and expanded, the fixed heating plate and the movable heating plate are stacked front and back, and the bottom of the movable heating plate is laterally fixed with an insulating strip, the insulating strip is connected to a laterally extending insulating rack, the teeth of the insulating rack are downward and meshed with insulating gears, and the insulating gears are driven forward and reverse by a remote-controlled micro-charging drive motor.

[0006] Preferably, the fixed heating plate and the remote-controlled micro-charging drive motor are both mounted on an insulating frame, the input power supply of the electric heating plate is connected to an external current regulator through an insulated wire, and the heating temperature of the electric heating plate is controlled by adjusting the current. Except for the electric heating plate, all other installed metal parts inside the transparent shell are shielded to prevent floating potential.

[0007] Preferably, a temperature sensor is fixedly installed on one of the two electric heating plates of the variable area overheating generating device, the temperature sensors are separated from the electric heating plates by thermally conductive insulating pads, and the data insulation wires of the temperature sensor probes are led to the external control module.

[0008] Preferably, wheels are installed at the bottom of the transparent shell for easy movement.

[0009] A working method of a transformer overheat fault reverse thrust device is carried out according to the following steps:

[0010] (1) According to the proportion of the transformer with overheating failure, a transparent shell, a simulated oil pillow and supporting devices with reduced oil capacity specifications of the simulated transformer are manufactured, and insulating oil is added from the oil filling port, which flows into the transparent shell through the connecting pipe and fills the transparent shell until the specified position of the simulated oil pillow is reached;

[0011] (2) The control module controls the upper remote-controlled micro-charging drive motor to adjust the upper movable electric heating plate to expand to a set area;

[0012] (3) The control module controls the upper current switch to close, turns on the current regulator and starts from 0 current, gradually increases the current output, and stops heating when the temperature of the upper temperature sensor reaches 700°C, which is the preset temperature of the actual transformer overheating fault;

[0013] (4) When the set time is reached, the four-way conversion valve of the online chromatographic instrument is controlled to switch the upper oil sampling port, the middle oil sampling port and the lower oil sampling port respectively, and the three oil sampling ports are used to take oil samples respectively;

[0014] (5) The online chromatographic instrument performs a chromatographic test on the three oil samples taken. The one with the highest concentration is the approximate location of the fault. In this case, the upper high temperature overheating fault is set in advance. Therefore, the online chromatographic test data shows that the concentration of the sample taken from the upper oil sampling port is the highest.

[0015] (6) Based on the concentration values ​​of the characteristic gas components of each overheating fault detected by the online chromatographic test, the control module automatically performs fault analysis and diagnosis according to the pre-set analysis and diagnosis;

[0016] (7) Similarly, the simulated overheating fault position test can be carried out in the middle and lower parts, or the test can be carried out according to other preset known temperatures and heating areas;

[0017] (8) By comparing with the chromatographic test of the transformer with actual overheating fault, the accuracy of overheating degree, heating area and overheating time of the transformer with actual overheating fault can be reversed and analyzed. It can also serve as a professional in the chromatography test of insulating oil in the power system, and conduct professional simulation training on chromatographic detection and fault analysis of characteristic gases dissolved in various overheating fault oils of transformers.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention is the first in the field of online chromatography detection of large power transformers. It is based on the oil capacity of the real transformer, and proportionally performs various known heat temperatures, known heating areas and known overheating times within a specific range, as well as artificial settings of various transformer overheating faults at the heating fault locations, causing the insulating oil around the fault point to pyrolyze and produce characteristic gases. Through the online gas chromatography test analysis data of these controlled simulated overheating faults, the real transformer overheating faults are simulated and reversed, which can accurately diagnose various conditions of overheating faults in real transformers, contribute to ensuring the safe operation of large power transformers, and also play a good role in the simulation and practical learning and training of professionals.

[0020] The present invention overcomes the insufficiencies and shortcomings of the traditional large-scale power transformer overheating fault online chromatographic detection, and can be used as practical simulation training for professionals, which is of great significance.

[0021] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a working diagram of an embodiment of the present invention.

[0023] Figure 2 2 is an internal structure diagram of an embodiment of the present invention.

[0024] Figure 3 This is a schematic diagram of the variable area superheat generating device before it is deployed.

[0025] Figure 4 This is a schematic diagram of the variable area superheat generating device after expansion.

[0026] Figure 5 This is the control principle block diagram of the control module. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0030] like Figures 1 to 5 As shown, this embodiment provides a transformer overheat fault reverse thrust device, including a transparent shell 1 that simulates the oil volume specification of the transformer and is scaled down according to the proportion, a simulated oil pillow 2, insulating oil 3 filled in the transparent shell and the simulated oil pillow, a plurality of variable area overheat generating devices 4, an online chromatograph 5, and a control module; an upper oil sampling port 6, a middle oil sampling port 7, and a lower oil sampling port 8 are respectively installed at the upper, middle, and lower positions of the side wall of the transparent shell, and each oil sampling port is respectively connected to a four-way conversion valve 9 of the online chromatograph; variable area overheat generating devices are installed at the upper, middle, and lower positions inside the transparent shell, and the variable area overheat generating devices are electrically connected to the control module; the simulated oil pillow is installed at the upper part of the transparent shell and connected to the transparent shell through a connecting pipe 10, and a refueling port 11 is installed at the upper part of the simulated oil pillow, and insulating oil is added to the simulated oil pillow through the refueling port, and the insulating oil in the simulated oil pillow flows into the transparent shell through the connecting pipe, and the insulating oil in the simulated oil pillow plays a role in balancing the thermal expansion and contraction of the insulating oil in the transparent shell.

[0031] In the embodiment of the present invention, the transparent shell is made of high-strength transparent organic material.

[0032] In the embodiment of the present invention, the variable area overheating generating device comprises two electric heating plates, both of which are rectangular electric heating elements of the same size, one of which is a fixed heating plate 12, and the other is a movable heating plate 13 that can be moved left and right, and the fixed heating plate and the movable heating plate are stacked front and back. Figure 3 As shown, the fixed heating plate and the movable heating plate are stacked front and back, with a stacking thickness in the front and back direction, and the area in contact with the oil is small. Figure 4 As shown, the movable heating plate moves left and right relative to the fixed heating plate, and the area in contact with the oil is larger. The bottom of the movable heating plate is fixedly installed with an insulating strip 14 in a transverse direction, and the insulating strip is connected with a transversely extending insulating rack 15. The teeth of the insulating rack are downward and meshed with an insulating gear 16. The insulating gear is driven by a remote-controlled micro-charged drive motor 17 to rotate forward and reverse, thereby increasing the adjustable heating area or reducing the heating area.

[0033] In the embodiment of the present invention, the fixed heating plate and the remote-controlled micro-charging drive motor are both installed on the insulating frame 25, and the input power of the electric heating plate is connected to the external current regulator 18 through the insulated wire 23. The heating temperature of the electric heating plate is controlled by adjusting the current. Except for the electric heating plate, all other installed metal parts inside the transparent shell are shielded to prevent floating potential.

[0034] In an embodiment of the present invention, a temperature sensor 19 is fixedly installed on one of the two electric heating plates of the variable area overheating generating device. The temperature sensors are separated from the electric heating plates by thermally conductive insulating pads 20, and the data insulating wire 21 of the temperature sensor probe is led to an external control module.

[0035] In the embodiment of the present invention, wheels 22 are installed at the bottom of the transparent shell for easy movement.

[0036] In an embodiment of the present invention, the output end of each temperature sensor is electrically connected to the input end of the control module, and the output end of the control module is electrically connected to the input end of the remote-controlled micro-charging drive motor, the current regulator, the upper current switch 24, the middle current switch, the lower current switch, the four-way conversion valve of the online chromatography instrument, etc.

[0037] A working method of a transformer overheat fault reverse thrust device is carried out according to the following steps:

[0038] (1) According to the proportion of the transformer with overheating failure, a transparent shell, a simulated oil pillow and supporting devices with reduced oil capacity specifications of the simulated transformer are manufactured, and insulating oil is added from the oil filling port, which flows into the transparent shell through the connecting pipe and fills the transparent shell until the specified position of the simulated oil pillow is reached;

[0039] (2) The control module controls the upper remote-controlled micro-charging drive motor to adjust the upper movable electric heating plate to expand to a set area;

[0040] (3) The control module controls the upper current switch to close, turns on the current regulator and starts from 0 current, gradually increases the current output, and stops heating when the temperature of the upper temperature sensor reaches 700°C, which is the preset temperature of the actual transformer overheating fault;

[0041] (4) When the set time is reached, the four-way conversion valve of the online chromatographic instrument is controlled to switch the upper oil sampling port, the middle oil sampling port and the lower oil sampling port respectively, and the three oil sampling ports are used to take oil samples respectively;

[0042] (5) The online chromatographic instrument performs a chromatographic test on the three oil samples taken. The one with the highest concentration is the approximate location of the fault. In this case, the upper high temperature overheating fault is set in advance. Therefore, the online chromatographic test data shows that the concentration of the sample taken from the upper oil sampling port is the highest.

[0043] (6) Based on the concentration values ​​of the characteristic gas components of each overheating fault detected by the online chromatographic test, the control module automatically performs fault analysis and diagnosis according to the pre-set analysis and diagnosis;

[0044] (7) Similarly, the simulated overheating fault position test can be carried out in the middle and lower parts, or the test can be carried out according to other preset known temperatures and heating areas;

[0045] (8) By comparing with the chromatographic test of the transformer with actual overheating fault, the accuracy of overheating degree, heating area and overheating time of the transformer with actual overheating fault can be reversed and analyzed. It can also serve as a professional in the chromatography test of insulating oil in the power system, and conduct professional simulation training on chromatographic detection and fault analysis of characteristic gases dissolved in various overheating fault oils of transformers.

[0046] The above is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still belongs to the protection scope of the technical solution of the present invention.

Claims

1. A transformer overheat fault reverse thrust device, characterized in that: It includes a transparent shell that is proportionally reduced in size to simulate the oil volume specifications of the transformer, a simulated oil pillow, insulating oil filled in the transparent shell and the simulated oil pillow, several variable area overheating generating devices, an online chromatographic instrument, and a control module; an upper oil sampling port, a middle oil sampling port and a lower oil sampling port are respectively installed at the upper, middle and lower positions of the side wall of the transparent shell, and each oil sampling port is respectively connected to the four-way conversion valve of the online chromatographic instrument; variable area overheating generating devices are installed at the upper, middle and lower positions inside the transparent shell, and the variable area overheating generating devices are electrically connected to the control module; the simulated oil pillow is installed at the upper part of the transparent shell and is connected to the transparent shell through a connecting pipe, and a refueling port is installed at the upper part of the simulated oil pillow, through which the refueling port is connected. Insulating oil is added into the simulated oil pillow through the connecting pipe, and the insulating oil in the simulated oil pillow flows into the transparent shell through the connecting pipe; the variable area overheating generating device includes two electric heating plates, both of which are rectangular electric heating elements of the same size, one of which is a fixed heating plate, and the other is a movable heating plate that can be moved left and right and unfolded, the fixed heating plate and the movable heating plate are stacked front and back, and the bottom of the movable heating plate is fixedly installed with insulating strips in the horizontal direction, and the insulating strips are connected with insulating racks extending in the horizontal direction, the teeth of the insulating racks are downward and meshed with insulating gears, and the insulating gears are driven forward and reverse by a remote-controlled micro-charging drive motor; wheels are installed at the bottom of the transparent shell for easy movement.

2. The transformer overheat fault reverse thrust device according to claim 1, characterized in that: The fixed heating plate and the remote-controlled micro-charging drive motor are both installed on an insulating frame. The input power supply of the electric heating plate is connected to an external current regulator through an insulated wire. The heating temperature of the electric heating plate is controlled by adjusting the current. Except for the electric heating plate, all other installed metal parts inside the transparent shell are shielded to prevent floating potential.

3. The transformer overheat fault reverse thrust device according to claim 1, characterized in that: A temperature sensor is fixedly installed on one of the two electric heating plates of the variable area overheating generating device. The temperature sensors are separated from the electric heating plates by thermally conductive insulating pads, and the data insulation wires of the temperature sensor probes are led to an external control module.

4. A working method of the transformer overheat fault reverse estimation device according to any one of claims 1 to 3, characterized in that: Follow these steps: (1) According to the proportion of the transformer with overheating failure, a transparent shell, a simulated oil pillow and supporting devices with reduced oil capacity specifications of the simulated transformer are manufactured, and insulating oil is added from the oil filling port, which flows into the transparent shell through the connecting pipe and fills the transparent shell until the specified position of the simulated oil pillow is reached; (2) The control module controls the upper remote-controlled micro-charging drive motor to adjust the upper movable electric heating plate to expand to a set area; (3) The control module controls the upper current switch to close, turns on the current regulator and starts from 0 current, gradually increases the current output, and stops heating when the temperature of the upper temperature sensor reaches 700°C, which is the preset temperature of the actual transformer overheating fault; (4) When the set time is reached, the four-way conversion valve of the online chromatographic instrument is controlled to switch the upper oil sampling port, the middle oil sampling port and the lower oil sampling port respectively, and the three oil sampling ports are used to take oil samples respectively; (5) The online chromatographic instrument performs a chromatographic test on the three oil samples taken. The one with the highest concentration is the approximate location of the fault. The fault is set to be an upper high temperature overheating fault in advance. Therefore, the online chromatographic test data shows that the concentration of the sample taken from the upper oil sampling port is the highest. (6) Based on the concentration values ​​of the characteristic gas components of each overheating fault detected by the online chromatographic test, the control module automatically performs fault analysis and diagnosis according to the pre-set analysis and diagnosis; (7) Similarly, the simulated overheating fault position test can be carried out in the middle and lower parts, or the test can be carried out according to other preset known temperatures and heating areas; (8) By comparing with the chromatographic test of the transformer with actual overheating fault, the accuracy of overheating degree, heating area and overheating time of the transformer with actual overheating fault can be reversed and analyzed. It can also serve as a professional in the chromatography test of insulating oil in the power system, and conduct professional simulation training on chromatographic detection and fault analysis of characteristic gases dissolved in various overheating fault oils of transformers.

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