CN117929654A - Transformer bushing free gas detection device and detection method - Google Patents
Transformer bushing free gas detection device and detection method Download PDFInfo
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- CN117929654A CN117929654A CN202410324879.9A CN202410324879A CN117929654A CN 117929654 A CN117929654 A CN 117929654A CN 202410324879 A CN202410324879 A CN 202410324879A CN 117929654 A CN117929654 A CN 117929654A
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- 238000004458 analytical method Methods 0.000 abstract description 8
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- Housings And Mounting Of Transformers (AREA)
Abstract
The application discloses a detection device and a detection method for free gas in a transformer bushing, wherein the detection device is formed by connecting a gas taking pump and an oil-gas separation module with a conservator in the transformer bushing through an oil-gas pipeline, when detection is needed, the gas taking pump is started only to pump out the oil-gas mixture in the conservator, then the free gas is separated through the oil-gas separation module, then the gas component data is detected through a gas sensor arranged in a gas channel of the oil-gas separation module, finally the control module is used for analysis processing, the corresponding detection result can be obtained, the sample is not needed to be taken out from the transformer bushing for analysis through manual operation, the induction power taking module is connected with a conducting rod in the transformer bushing, automatic gas taking monitoring analysis of the transformer bushing at any time or continuously can be realized, and the state detection work efficiency of the transformer bushing is improved.
Description
Technical Field
The application relates to the technical field of transformers, in particular to a device and a method for detecting free gas of a transformer bushing.
Background
The transformer bushing is used as an important component of power transmission and transformation equipment, and partial discharge, abnormal temperature rise and other faults can occur in the transformer bushing due to insulation and moisture, so that the bushing insulation is aged and deteriorated, breakdown insulation is even caused when the insulation is severe, a bushing ignition burst accident is caused, and a great risk is brought to safe and stable operation of a power system, so that the state of the transformer bushing needs to be detected to ensure safe operation of a transformer.
When the inside of the sleeve is discharged or overheated, the internal insulating oil and the solid insulating material are slowly aged and decomposed under the catalysis of temperature, an electric field, oxygen, moisture, copper, iron and other materials, so that a certain amount of acid, grease, oil sludge and other degradants are generated, and a small amount of H2, low-molecular hydrocarbon gas and carbon oxides are also generated. Among them, the oxide component of carbon is the largest, followed by hydrogen and hydrocarbon gas.
Under certain temperature and pressure, the gas generated by the decomposition of the insulating material forms bubbles, and is dissolved in the oil continuously through convection and diffusion in the oil, and the mass transfer process is as follows: movement of bubbles, diffusion, dissolution and exchange of gas molecules, precipitation and outward escape of gas. When the dissolution rate of the gas in the oil is equal to the rate of gas evolution from the oil, then the gas-oil two phases are in dynamic equilibrium.
In addition to the gas generated by the fault inside the sleeve in actual operation, there are other reasons that the sleeve oil conservator can generate free gas. If the environment temperature suddenly drops or the running load drops, the oil temperature of the sleeve is reduced, the oil level drops, the pressure difference between the inside and the outside of the oil conservator occurs, air permeates into the sleeve oil conservator from the poor sealing position, if the gas is gathered in the sleeve oil conservator, the gas is required to be collected by power failure and sent to a physicochemical laboratory, the components of the gas are tested, then the reason of the gas occurrence in the sleeve oil conservator is judged according to the test result, and corresponding operation, maintenance and repair measures are made.
At present, the main method for detecting the state of the transformer bushing is an analysis method for dissolved gas in oil, the method firstly needs to take oil and gas from the bushing in a power failure mode, then analyzes the taken sample, however, the bushing is low-oil equipment, the oil taking risk is high, manual operation is relied on, the method can only be carried out regularly, high-frequency monitoring cannot be achieved, and the technical problem that the execution efficiency of state detection work is low exists.
Disclosure of Invention
The application provides a device and a method for detecting free gas of a transformer bushing, which are used for solving the technical problem that the existing transformer bushing state detection work has low execution efficiency.
In order to solve the above technical problems, a first aspect of the present application provides a device for detecting free gas in a transformer bushing, including: the device comprises an induction electricity taking module, an oil-gas separation module, a control module, an air taking pump and an oil-gas pipeline;
the induction power taking module comprises: the induction coil is used for being connected with the sleeve conductive part in an electromagnetic induction way, and the electric energy conversion submodule is connected with the induction coil;
The mixture input port of the oil-gas separation module is fixedly connected with the air outlet of the sleeve oil conservator through the oil-gas pipeline, the oil outlet of the oil-gas separation module is fixedly connected with the oil-way inlet of the sleeve oil conservator through the oil-gas pipeline, and a gas sensing device is arranged in a gas path channel of the oil-gas separation module;
The gas taking pump is arranged in a gas-oil pipeline between a mixture input port of the gas-oil separation module and a gas outlet of the sleeve oil conservator;
The control module is used for controlling the start and stop of the gas taking pump, receiving and processing the gas component data acquired by the gas sensing device, and obtaining a free gas detection result.
Preferably, the electric energy conversion submodule specifically includes: the power supply comprises a rectifying circuit, a voltage stabilizing circuit, a clamping circuit, a filter circuit and a direct current converter, wherein the rectifying circuit, the voltage stabilizing circuit, the clamping circuit, the filter circuit and the direct current converter are sequentially connected, the input end of the rectifying circuit is used for being connected with an induction coil, and the output end of the direct current converter is used for being connected with an electric energy output interface.
Preferably, the power conversion sub-module further comprises: a tank circuit;
The energy storage circuit is arranged between the direct current converter and the electric energy output interface.
Preferably, the oil-gas separation module specifically includes: a spin oil gas pipe and a gas path channel;
The top of the spin oil gas pipe is provided with a mixture input port;
The air inlet of the air channel is arranged in the spin oil air pipe and is close to the bottom of the spin oil air pipe.
Preferably, the gas path channel of the oil-gas separation module is specifically: the labyrinth air channel is provided with a plurality of U-shaped corners.
Preferably, the gas sensor is arranged at the U-shaped corner of the labyrinth gas path channel.
Preferably, the method further comprises: a communication module;
The communication module is in communication connection with the control module and is used for being in communication connection with the back-end equipment.
Preferably, the communication module includes: bluetooth communication module, mobile communication module and/or wired communication module.
The second aspect of the present application provides a method for detecting free gas in a transformer bushing, which is applied to the device for detecting free gas in a transformer bushing provided in the first aspect of the present application, and the method includes:
Responding to a detection instruction sent by the control module, starting an air taking pump so as to convey an oil-gas mixture and an oil-gas pipeline in the sleeve oil conservator to the oil-gas separation module through the air taking pump;
detecting the free gas separated by the oil-gas separation module through a gas sensing device, and sending the obtained gas component data to a control module;
and processing the gas component data by combining a control module with a preset free gas detection logic to obtain a free gas detection result.
Preferably, the method further comprises the following steps of:
and when the free gas detection result is abnormal, reporting a transformer abnormality warning message containing the free gas detection result to back-end equipment through a communication module.
From the above technical scheme, the application has the following advantages:
The detection device provided by the application is characterized in that the gas taking pump and the oil-gas separation module are connected with the oil conservator in the transformer bushing through the oil-gas pipeline to form a closed transformer oil-gas conveying loop, when detection is needed, the gas-gas pump is started, the oil-gas mixture in the oil conservator is pumped out, then the free gas is separated through the oil-gas separation module, the gas component data is detected through the gas sensor arranged in the gas channel of the oil-gas separation module, finally the control module is used for analyzing and processing, the corresponding detection result can be obtained, the sample is not needed to be taken out from the transformer bushing for analysis through manual operation, the induction power taking module is connected with the conducting rod in the transformer bushing, so that electric energy is directly obtained from a detected object through an electromagnetic induction mode for other power utilization modules of the detection device, no additional electric energy supply is needed, automatic gas taking monitoring analysis of the transformer bushing at any time or continuously can be realized, and the efficiency of the state detection work of the transformer bushing is improved.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the application, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a transformer bushing free gas detection device provided by the application.
Fig. 2 is a schematic circuit diagram of an induction power taking module of a transformer bushing free gas detection device provided by the application.
Fig. 3 is a schematic structural diagram of an oil-gas separation module of a transformer bushing free gas detection device provided by the application.
Fig. 4 is a schematic flow chart of a method for detecting free gas in a transformer bushing provided by the application.
Reference numerals in the drawings are as follows:
1. An induction power taking module; 11. an induction coil; 12. an electrical energy conversion sub-module; 2. an oil-gas separation module; 21. a spin oil gas tube; 22. a labyrinth air path channel; 23. a gas sensor device; 3. a control module; 4. an air taking pump; 5. a sleeve conductive member; 6. and a sleeve oil conservator.
Detailed Description
The embodiment of the application provides a device and a method for detecting free gas of a transformer bushing, which are used for solving the technical problem that the existing transformer bushing state detection work has low execution efficiency.
In order to make the objects, features and advantages of the present application more comprehensible, the technical solutions in the embodiments of the present application are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Firstly, the application provides a detailed description of an embodiment of a free gas detection device for a transformer bushing, which comprises the following specific steps:
Referring to fig. 1, an embodiment of a transformer bushing free gas detection apparatus provided by the present application includes: the device comprises an induction electricity taking module 1, an oil-gas separation module 2, a control module 3, an air taking pump 4 and an oil-gas pipeline;
The induction power taking module 1 comprises: the induction coil 11 is used for electromagnetic induction connection with the sleeve conductive component 5, and the electric energy conversion submodule 12 is connected with the induction coil 11;
the mixture input port of the oil-gas separation module 2 is fixedly connected with the air outlet of the sleeve oil conservator 6 through an oil-gas pipeline, the oil outlet of the oil-gas separation module 2 is fixedly connected with the oil-way inlet of the sleeve oil conservator 6 through an oil-gas pipeline, and a gas sensing device 23 is arranged in the gas path channel of the oil-gas separation module 2;
The gas taking pump 4 is arranged in a gas-oil pipeline between the mixture input port of the gas-oil separation module 2 and the gas outlet of the sleeve oil conservator 6;
the control module 3 is used for controlling the start and stop of the gas taking pump 4, receiving and processing the gas component data acquired by the gas sensing device 23, and obtaining a free gas detection result.
It should be noted that, the whole detection device provided in this embodiment may be installed inside the transformer, and the whole device may be integrated with the sleeve oil conservator 6 according to actual requirements, where the control module 3 is a control center of the whole detection device, and may be composed of a single chip microcomputer, a programmable logic controller, and other devices; the induction electricity taking module 1 is an electric energy supply center of the detection device, is connected with a conducting rod/conducting head of a transformer sleeve through an induction coil 11, is used for continuously acquiring electric energy from a transformer in operation in an electromagnetic induction mode, and is used for continuously providing electric energy for electric loads such as a control module 3, an air taking pump 4, a sensing device and the like of the detection device; the gas taking pump 4 and the oil-gas separation module 2 are connected with the oil conservator in the transformer bushing through the oil-gas pipeline to form a closed transformer oil-gas conveying loop, when detection is needed, the oil-gas mixture in the oil conservator is pumped out only by starting the gas taking pump 4, then free gas is separated through the oil-gas separation module 2, the gas component data is detected through the gas sensor 23 arranged in the gas channel of the oil-gas separation module 2 and used for analysis to obtain corresponding free gas detection results, the detection device provided by the application can realize automatic transformer bushing gas taking monitoring analysis, and the detection of the transformer bushing can be realized at any time or continuously by setting the starting logic of the detection device through the control module 3, so that the efficiency of transformer bushing state detection work is improved.
The above detailed description of the basic embodiment of the transformer bushing free gas detection device provided by the application further includes the following technical contents:
In some embodiments, as shown in fig. 2, the power conversion sub-module 12 of the present embodiment specifically includes: the device comprises a rectifying circuit, a voltage stabilizing circuit, a clamping circuit, a filter circuit and a direct current converter, wherein the rectifying circuit, the voltage stabilizing circuit, the clamping circuit, the filter circuit and the direct current converter are sequentially connected, the input end of the rectifying circuit is used for being connected with an induction coil 11, and the output end of the direct current converter is used for being connected with an electric energy output interface.
Further, the power conversion sub-module 12 further includes: a tank circuit;
The energy storage circuit is arranged between the direct-current converter and the electric energy output interface.
It should be noted that, the induction power taking module 1 of this embodiment is composed of an induction coil 11, a rectifying module, a clamping module, a voltage stabilizing module, a filtering module and an energy storage module. The induction coil 11 may be wound directly on the sleeve conducting rod or placed near the conducting rod. When the sleeve is in operation, the conducting rod passes through alternating current, and the induction coil 11 generates induction voltage according to the electromagnetic induction principle. The induced current is converted into direct current after rectification and voltage stabilization.
Since the current flowing through the bushing conductor rod varies over a large range in accordance with the variation of the line load during operation of the bushing, the induced voltage of the induction coil 11 also varies over a large range. The clamp module will limit the induced voltage rise. The filtering module will further suppress the harmonic content of the induced current. The DC converter converts the DC voltage to a proper voltage and stores the proper voltage in the energy storage module.
Further, as shown in fig. 3, the oil-gas separation module 2 of the present embodiment specifically includes: a spin oil gas pipe 21 and a gas path passage;
The top of the spin oil gas pipe 21 is provided with a mixture input port;
the air inlet of the air channel is arranged in the spin oil air pipe 21 and is close to the bottom of the spin oil air pipe 21.
More specifically, the gas path of the oil-gas separation module 2 is specifically: the labyrinth air path channel 22, the labyrinth air path channel 22 is provided with a plurality of U-shaped corners. The gas sensor is located at the U-shaped corner of the labyrinth air path channel 22.
It should be noted that, the oil-gas separation module 2 provided in this embodiment is composed of a spin oil-gas separation tube, a labyrinth air passage 22, a sensor, and a pipeline. The spinning oil-gas separation pipe is provided with three interfaces, namely an oil-gas mixed liquid input port, an oil outlet and an air outlet. The spin oil-gas separation pipe is internally provided with a spiral channel, when the oil-gas mixture enters from the input port at high speed, the mixture flows downwards along the spiral channel, and centrifugal force is generated by the rotation motion. Because the oil and gas densities are different, the heavier oil will flow out from the bottom oil outlet and lighter gas will enter the labyrinth air passage 22 from the upper air outlet. Various gas sensors are arranged at different positions of the labyrinth air path channel 22 to identify the contained gas components.
The above is a detailed description of an embodiment of the free gas detection device for transformer bushings provided by the application, and the following is a detailed description of an embodiment of the free gas detection method for transformer bushings in China provided by the application.
Referring to fig. 4, the application provides an embodiment of a method for detecting free gas in a transformer bushing, which is applied to a device for detecting free gas in a transformer bushing provided in the foregoing embodiment of the application, and the method includes:
Step 101, responding to a detection instruction sent by the control module, starting an air taking pump so as to convey an oil-gas mixture and an oil-gas pipeline in the sleeve oil conservator to the oil-gas separation module through the air taking pump;
102, detecting free gas separated by an oil-gas separation module through a gas sensing device, and sending obtained gas component data to a control module;
And 103, processing the gas component data by combining a control module with a preset free gas detection logic to obtain a free gas detection result.
Further, the step 103 of obtaining the free gas detection result further includes:
and 104, reporting a transformer abnormality warning message containing the free gas detection result to the back-end equipment through the communication module when the free gas detection result is abnormal.
In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A transformer bushing free gas detection device, comprising: the device comprises an induction electricity taking module, an oil-gas separation module, a control module, an air taking pump and an oil-gas pipeline;
the induction power taking module comprises: the induction coil is used for being connected with the sleeve conductive part in an electromagnetic induction way, and the electric energy conversion submodule is connected with the induction coil;
The mixture input port of the oil-gas separation module is fixedly connected with the air outlet of the sleeve oil conservator through the oil-gas pipeline, the oil outlet of the oil-gas separation module is fixedly connected with the oil-way inlet of the sleeve oil conservator through the oil-gas pipeline, and a gas sensing device is arranged in a gas path channel of the oil-gas separation module;
The gas taking pump is arranged in a gas-oil pipeline between a mixture input port of the gas-oil separation module and a gas outlet of the sleeve oil conservator;
The control module is used for controlling the start and stop of the gas taking pump, receiving and processing the gas component data acquired by the gas sensing device, and obtaining a free gas detection result.
2. The transformer bushing free gas detection device of claim 1, wherein the power conversion submodule specifically comprises: the power supply comprises a rectifying circuit, a voltage stabilizing circuit, a clamping circuit, a filter circuit and a direct current converter, wherein the rectifying circuit, the voltage stabilizing circuit, the clamping circuit, the filter circuit and the direct current converter are sequentially connected, the input end of the rectifying circuit is used for being connected with an induction coil, and the output end of the direct current converter is used for being connected with an electric energy output interface.
3. The transformer bushing free gas detection device of claim 2, wherein the power conversion sub-module further comprises: a tank circuit;
The energy storage circuit is arranged between the direct current converter and the electric energy output interface.
4. The transformer bushing free gas detection device according to claim 1, wherein the oil-gas separation module specifically comprises: a spin oil gas pipe and a gas path channel;
The top of the spin oil gas pipe is provided with a mixture input port;
The air inlet of the air channel is arranged in the spin oil air pipe and is close to the bottom of the spin oil air pipe.
5. The transformer bushing free gas detection device according to claim 1, wherein the gas path channel of the oil-gas separation module is specifically: the labyrinth air channel is provided with a plurality of U-shaped corners.
6. The transformer bushing free gas detection device of claim 5, wherein the gas sensor is disposed at a U-shaped corner of the labyrinth air path channel.
7. The transformer bushing free gas detection device of claim 1, further comprising: a communication module;
The communication module is in communication connection with the control module and is used for being in communication connection with the back-end equipment.
8. The transformer bushing free gas detection device of claim 7, wherein the communication module comprises: bluetooth communication module, mobile communication module and/or wired communication module.
9. A method for detecting free gas in a transformer bushing, applied to a device for detecting free gas in a transformer bushing according to any one of claims 1 to 8, comprising:
Responding to a detection instruction sent by the control module, starting an air taking pump so as to convey an oil-gas mixture and an oil-gas pipeline in the sleeve oil conservator to the oil-gas separation module through the air taking pump;
detecting the free gas separated by the oil-gas separation module through a gas sensing device, and sending the obtained gas component data to a control module;
and processing the gas component data by combining a control module with a preset free gas detection logic to obtain a free gas detection result.
10. The method for detecting free gas in a transformer bushing according to claim 9, further comprising, after obtaining the free gas detection result:
and when the free gas detection result is abnormal, reporting a transformer abnormality warning message containing the free gas detection result to back-end equipment through a communication module.
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| CN202410324879.9A CN117929654A (en) | 2024-03-21 | 2024-03-21 | Transformer bushing free gas detection device and detection method |
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