Transformer butterfly valve oil leakage monitoring device and working method

Abstract

The invention provides a transformer butterfly valve oil leakage monitoring device and a working method, and relates to the technical field of power equipment on-line monitoring, the transformer butterfly valve oil leakage monitoring device comprises an on-site acquisition unit and a remote control analysis unit, the on-site acquisition unit gathers leaked oil through an oil collection funnel to form oil drops; detecting oil drops in a non-contact manner by using a photoelectric counting sensor and generating a pulse signal; and the remote control analysis unit receives the pulse signal, calculates the oil penetration rate and the accumulated oil quantity, and carries out early warning and remote communication. According to the invention, real-time, automatic and quantitative monitoring and accurate early warning of the oil leakage state of the butterfly valve of the transformer are realized, the problems of incapability of quantitative analysis, easy interference and response lag of traditional manual inspection and a simple sensor are effectively solved, and a reliable technical means is provided for state maintenance and intelligent operation and maintenance of power equipment.

Description

Technical Field

[0001] This invention relates to the field of online monitoring technology for power equipment, and in particular to a transformer butterfly valve oil leakage monitoring device and its working method. Background Technology

[0002] Transformers are core equipment in the power grid, filled with insulating oil that serves for insulation and heat dissipation. Butterfly valves, as key components on transformers that connect or disconnect oil circuits, are subject to long-term exposure to factors such as oil pressure, temperature changes, mechanical vibration, and aging of sealing materials. Their sealing gaskets are therefore prone to oil leakage. Currently, oil leakage from transformer butterfly valves is widespread, posing a significant threat to the safe and stable operation of the power grid. Oil leakage can cause a series of serious problems, including decreased insulation strength, fire hazards, environmental pollution, and accelerated equipment aging. If not detected and addressed promptly, it can lead to equipment failure or even power grid accidents. Therefore, achieving real-time, accurate, and quantitative monitoring of oil leakage from transformer butterfly valves is a critical technical issue that urgently needs to be addressed in the field of power equipment operation and maintenance.

[0003] Current technologies for monitoring oil leakage from transformer butterfly valves primarily rely on periodic manual inspections and simple fixed-point oil-immersed sensors. Manual inspections suffer from inherent drawbacks such as high subjectivity, poor timeliness, and high cost, making it difficult to detect early, minute leaks. Consequently, oil leakage problems are often only detected after they have developed into serious defects. Fixed-point sensors, on the other hand, typically have limited functionality, providing only on / off alarms. They are susceptible to environmental interference such as rain and dust and cannot perform quantitative analysis of key parameters such as leakage rate and cumulative oil volume. Therefore, they fail to meet the needs for accurate classification, trend prediction, and intelligent early warning of oil leakage defects, and cannot fundamentally solve the problems of reliability, accuracy, and real-time monitoring of oil leakage. Summary of the Invention

[0004] To address the technical problems of poor reliability, inability to perform quantitative analysis, and delayed early warning in the aforementioned background technologies, this invention provides a transformer butterfly valve oil leakage monitoring device and its operating method. Through a technical architecture that combines a field acquisition unit with a remote control and analysis unit, the device utilizes an oil collection funnel to gather leaking oil into droplets. A photoelectric counting sensor is used to detect the oil droplets non-contactly and generate pulse signals. The remote control and analysis unit then processes the pulse signals to quantitatively calculate oil leakage parameters and issue early warnings. This provides a dedicated device capable of real-time, automatic, and quantitative monitoring of transformer butterfly valve oil leakage status, providing accurate data to achieve a shift from "post-event handling" to "pre-event early warning" and "precise diagnosis."

[0005] The first aspect of this invention provides a transformer butterfly valve oil leakage monitoring device, comprising:

[0006] The on-site data acquisition unit, used to receive, collect, and detect leaking oil, includes an oil collection funnel, a photoelectric counting sensor assembly, and an oil collection bottle. The oil collection funnel collects and guides the insulating oil leaking from the butterfly valve, causing it to form oil droplets at the outlet. The photoelectric counting sensor assembly is located below the outlet of the oil collection funnel and is used for non-contact detection of falling oil droplets and generation of pulse signals. The oil collection bottle is located below the photoelectric counting sensor assembly and is used to collect the oil droplets.

[0007] The remote control and analysis unit includes a control panel and a signal transmission line; the control panel is connected to the photoelectric counting sensor assembly via the signal transmission line, and is used to receive the pulse signal, calculate the oil seepage rate and / or cumulative oil seepage based on the pulse signal, and is also used for early warning and remote data communication.

[0008] Furthermore, the on-site collection unit also includes a funnel protective cover, which covers the top of the oil collecting funnel to prevent rainwater and dust from entering.

[0009] Furthermore, the funnel protective cover is a split structure with two half-covers symmetrically spliced ​​together. The edges of the cover are provided with screw holes for docking and fixing, and a sealing structure is provided at the docking edge.

[0010] Furthermore, the top of the funnel protective cover is provided with an operating hole and a detachable butterfly rod operating cap is provided. The operating hole is used for the butterfly rod of the transformer to pass through.

[0011] Furthermore, the inner cavity of the oil collecting funnel is provided with an inclined guide groove, the end of which converges at the oil leakage hole at the bottom.

[0012] Furthermore, the photoelectric counting sensor assembly includes a U-shaped photoelectric sensor, wherein the transmitting end and the receiving end of the U-shaped photoelectric sensor are arranged opposite each other to form a detection optical path, and when the oil droplet passes through the detection optical path, it blocks the infrared light and triggers a pulse signal.

[0013] Furthermore, the field acquisition unit also includes a sensor mounting clamp, which includes an upper retaining ring for gripping the outlet of the oil collecting funnel, a lower screw ring for gripping the mouth of the oil collecting bottle, and a clamping groove for fixing the U-shaped photoelectric sensor.

[0014] Furthermore, the field acquisition unit also includes a first support and a second support. The upper surfaces of the first support and the second support are arc-shaped surfaces that are adapted to the outer contour of the horizontal cylinder of the butterfly valve, and are engaged with the outer surface of the cylinder through the arc-shaped surfaces. The first support is provided with a first crossbeam, and the second support is provided with a second crossbeam. The first crossbeam and the second crossbeam are arranged opposite to each other. The bottom of the oil collecting funnel is supported on the first crossbeam and the second crossbeam.

[0015] Furthermore, the control panel integrates an Internet of Things (IoT) wireless communication module, which is used to send oil leakage data, early warning information, and equipment status to a remote monitoring platform.

[0016] A second aspect of the present invention provides a method for operating the transformer butterfly valve oil leakage monitoring device described in the first aspect, comprising the following steps:

[0017] The insulating oil seeping from the transformer butterfly valve is collected and gathered by the oil collection funnel, forming oil droplets at the funnel outlet.

[0018] As the oil droplet falls and passes through the detection area of ​​the photoelectric counting sensor component, the sensor detects the oil droplet passing through and generates a corresponding pulse signal.

[0019] The pulse signal is transmitted to a remote control panel via a signal transmission line;

[0020] The control panel receives and records the pulse signals, calculates the real-time oil seepage rate by the time interval between adjacent pulse signals, and calculates the cumulative oil seepage amount by the cumulative number of pulse signals.

[0021] The control panel compares the real-time oil seepage rate and / or the cumulative oil seepage amount with a preset threshold. When the threshold is exceeded, an early warning message is generated and issued.

[0022] The control panel transmits oil leakage data and early warning information to the remote monitoring platform via a wireless communication module.

[0023] Compared with the prior art, the transformer butterfly valve oil leakage monitoring device and working method provided by the present invention have the following beneficial effects:

[0024] (1) This invention realizes the quantitative and automated monitoring of oil seepage status. This invention forms countable oil droplets through physical diversion and converts each oil droplet falling event into an electrical pulse using non-contact photoelectric detection. By analyzing the pulse time interval and cumulative number, the control panel can accurately calculate the oil seepage rate and cumulative oil seepage volume, thereby transforming the elusive oil seepage phenomenon into objective and continuous digital parameters, providing data support for the accurate classification of oil leakage defects and the transformation from "post-event handling" to "pre-event warning".

[0025] (2) This invention improves the reliability and environmental adaptability of on-site detection based on the structure of the funnel protective cover, the guide channel, the sensor mounting clamp, and the bracket rigidly connected to the butterfly valve. The protective cover and sealing structure effectively isolate the interference of rainwater and dust; the internal guide channel ensures the stable formation of oil droplets; the special mounting clamp and the installation method of stable support through the crossbeam ensure that the opening of the oil collection funnel is accurately aligned with the oil seepage point for a long time. It significantly improves the ability to capture oil seepage signals and the anti-interference performance in complex outdoor environments, ensuring the accuracy and reliability of oil seepage monitoring data from the source.

[0026] (3) This invention realizes local intelligent analysis and remote real-time reporting of data. The control panel not only completes the real-time calculation of oil leakage parameters, but also automatically issues graded warnings based on preset thresholds. At the same time, the data and alarm information are synchronized to the remote monitoring platform through the wireless communication module, enabling maintenance personnel to grasp the equipment status anytime and anywhere, conduct trend analysis and make scientific decisions, which greatly improves the operation and maintenance response speed, decision-making scientificity and management intelligence level of oil leakage faults, and effectively solves the problems of lagging perception and passive handling of oil leakage status in traditional methods. Attached Figure Description

[0027] The accompanying drawings, which form part of this disclosure, are used to provide a further understanding of this disclosure. The illustrative embodiments of this disclosure and their descriptions are used to explain this disclosure and do not constitute an undue limitation of this disclosure. The spacing or dimensions between parts are exaggerated to show the position of each part, and the schematic diagrams are for illustrative purposes only.

[0028] Figure 1 This is a schematic diagram of the overall structure of the transformer butterfly valve oil leakage monitoring device provided in Embodiment 1 of the present invention;

[0029] Figure 2 This is a bottom view of the funnel protective cover provided in Embodiment 1 of the present invention;

[0030] Figure 3 This is a top view of the oil collecting funnel provided in Embodiment 1 of the present invention;

[0031] Figure 4 This is a schematic diagram of the butterfly lever operating cap provided in Embodiment 1 of the present invention;

[0032] Figure 5 This is a top view of the funnel protective cover after removing the butterfly rod operating cap, as provided in Embodiment 1 of the present invention;

[0033] Figure 6 This is a schematic diagram of the U-shaped photoelectric sensor fixed to the bottom of the oil leak according to Embodiment 1 of the present invention;

[0034] Figure 7 This is a schematic diagram of the sensor mounting clamp provided in Embodiment 1 of the present invention;

[0035] Figure 8 This is a schematic diagram of the oil collecting bottle provided in Embodiment 1 of the present invention;

[0036] Figure 9 This is a schematic diagram of the butterfly valve fixing method provided in Embodiment 1 of the present invention;

[0037] The components include: 1. Funnel protective cover; 2. Oil collecting funnel; 3. Butterfly rod operating cap; 4. Photoelectric counting sensor assembly; 5. Oil collecting bottle; 6. Signal terminal box; 7. Control panel; 8. Signal transmission line; 9. First crossbeam; 10. Second crossbeam; 11. First bracket; 12. Second bracket; 13. Operating hole; 14. Oil leakage hole; 15. Butterfly rod; and 16. Butterfly valve. Detailed Implementation

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0039] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0040] It should be noted that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the exemplary embodiments of the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form as well. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. The use of the words "upper," "lower," "left," and "right" in this invention only indicates alignment with the upper, lower, left, and right directions of the drawings themselves and does not limit the structure. They are merely for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the invention.

[0041] Example 1

[0042] This embodiment provides a transformer butterfly valve oil leakage monitoring device, which is divided into two core parts: a field acquisition unit and a remote control and analysis unit. The field acquisition unit is directly deployed below the transformer butterfly valve and is responsible for collecting, detecting, and generating raw signals of oil leakage; the remote control and analysis unit is deployed in the main control room or a dedicated cabinet and is responsible for signal processing, data analysis, early warning display, and remote communication.

[0043] like Figure 1 As shown, it includes:

[0044] The on-site data collection unit is used to receive, collect, and detect leaking oil. It includes an oil collection funnel (2), a photoelectric counting sensor assembly (4), and an oil collection bottle (5). The oil collection funnel (2) is used to collect and guide the insulating oil leaking from the butterfly valve, causing it to form oil droplets at the outlet. The photoelectric counting sensor assembly (4) is located below the outlet of the oil collection funnel (2) and is used to detect the falling oil droplets in a non-contact manner and generate pulse signals. The oil collection bottle (5) is located below the photoelectric counting sensor assembly (4) and is used to collect the oil droplets.

[0045] The remote control analysis unit includes a control panel (7) and a signal transmission line (8); the control panel (7) is connected to the photoelectric counting sensor assembly (4) through the signal transmission line (8) to receive the pulse signal and calculate the oil seepage rate and / or cumulative oil seepage based on the pulse signal, and is also used for early warning and remote data communication.

[0046] Dispersed, minute amounts of oil seepage are physically collected into countable individual oil droplet events using an oil collection funnel. Each droplet's fall is converted into an electrical pulse signal using non-contact photoelectric sensing. Finally, a remote analysis unit times and counts these pulses, transforming the difficult-to-quantify oil seepage phenomenon into precise digital parameters (dropping rate, total number of drops). This technological approach solves the problem of quantitative analysis in oil seepage monitoring using manual inspections and simple sensors, achieving digital and quantifiable monitoring of oil seepage conditions.

[0047] Specifically, the field collection unit also includes a funnel protective cover (1), which covers the top of the oil collecting funnel (2) to prevent rainwater and dust from entering.

[0048] In one specific embodiment, the funnel protective cover (1) is designed as follows: it adopts a split structure with symmetrical splicing of two half-covers, and the cover can be rotated and opened 180°; the opening edge extends outward and is evenly provided with several screw holes, and the two half-covers are fixed by screw docking; the docking edge adopts a double-layer sealing structure with built-in sealing gaskets or sealing ribs, and in conjunction with the sealing design of the flange interface, it forms a double anti-leakage protection; the edge of the cover extends downward to form an annular skirt, further blocking lateral rain and dust intrusion. The funnel protective cover (1) is made of insulating and flame-retardant material in accordance with the requirements of JB / T 5345---2016 and GB17466-1998 standards, and is suitable for an ambient temperature range of -30℃ to 130℃, and has rainproof, dustproof, anti-aging and corrosion-resistant properties.

[0049] In outdoor substation environments, foreign objects such as rainwater, snow, dust, or flying insects entering the funnel may be misinterpreted as oil droplets by photoelectric sensors, triggering false alarms. For example... Figure 2 As shown, the funnel-shaped protective cover significantly reduces environmental interference through physical isolation, thereby improving the detection accuracy and reliability of the device under complex weather conditions.

[0050] Specifically, the funnel protective cover (1) is a split structure with two half-covers symmetrically spliced ​​together. The edge of the cover is provided with screw holes for docking and fixing, and a sealing structure is provided at the docking edge.

[0051] The double-half-shell splicing design facilitates on-site installation around butterfly valves and existing pipelines, eliminating the need for top-mounting and making installation more convenient. Sealing structures (such as gaskets or sealing ribs) are incorporated at the joint edges. These, in conjunction with the bolt hole fixing method, create an effective seal at the junction of the two shell parts, preventing oil vapor from escaping or external liquids from seeping in. This resolves the contradiction between the difficulty of installing a single-piece shell and the tendency for leakage in a split-piece shell.

[0052] Specifically, the top of the funnel protective cover (1) is provided with an operation hole (13) and a detachable butterfly rod operation cap (3) is provided. The operation hole (13) is used for the butterfly rod (15) of the transformer to pass through.

[0053] In one specific embodiment, the butterfly valve operating cap (3) is a detachable small cap, which is cylindrical or frustum-shaped and made of the same material as the funnel protective cover (1), and has insulating and flame-retardant properties. The inner side is provided with a sealing structure that matches the edge of the operating hole (13). After the cap is closed, the operating hole (13) can be sealed to prevent water and dust. Its size is precisely matched with the operating hole (13). After it is removed, the butterfly valve (15) can be fully exposed, which is convenient for maintenance personnel to operate the butterfly valve (15). After installation, it does not affect the overall sealing performance of the protective cover.

[0054] While ensuring the overall sealing and protection of the protective cover, a channel should be reserved for the butterfly valve's stem. For example... Figure 4 and Figure 5 As shown, when maintenance personnel need to operate the butterfly valve (such as opening or closing the valve), they only need to remove the detachable butterfly rod operating cap to expose the butterfly rod for operation, and then replace the cap after operation. This design combines the fixed installation of the monitoring device with the maintainability of the equipment itself, solving the problem that adding a monitoring device may hinder the normal operation and maintenance of the equipment.

[0055] Specifically, the inner cavity of the oil collecting funnel (2) is provided with an inclined guide groove, and the end of the guide groove converges at the oil leakage hole (14) at the bottom.

[0056] In one specific embodiment, the structure of the oil collecting funnel (2) is designed as follows: the bottom is funnel-shaped, the inner cavity of the shell is provided with an inclined guide groove, the guide groove is evenly distributed along the inner wall, and finally converges at the oil leakage hole (14) at the center of the bottom; the diameter of the oil leakage hole (14) is adapted to the size of the oil droplet formation, ensuring that the seepage oil converges into a stable oil droplet after being guided and falls, avoiding oil stagnation or diffusion.

[0057] The inclined guide channel structure alters the oil flow path. Oil droplets seeping from different positions on the butterfly valve fall onto the inner wall of the funnel and, under gravity, quickly converge towards the bottom center (oil leak hole) along the guide channel, preventing the oil from spreading flat, stagnating, or overflowing on the bottom surface of the funnel. For example... Figure 3 As shown, this forced flow design ensures that all leaked oil can be collected at a single outlet and form relatively uniform oil droplets, creating the necessary conditions for subsequent photoelectric sensors to achieve stable and consistent detection, and solving the detection error problem caused by incomplete oil collection or irregular shape.

[0058] Specifically, the photoelectric counting sensor assembly (4) includes a U-shaped photoelectric sensor. The transmitting end and receiving end of the U-shaped photoelectric sensor are arranged opposite each other to form a detection optical path. When the oil droplet passes through the detection optical path, it blocks the infrared light and triggers a pulse signal.

[0059] In one specific embodiment, the photoelectric counting sensor assembly (4) is based on a U-shaped photoelectric sensor. The sensor transmitter and receiver are symmetrically distributed on both sides of the U-shaped groove to form a blind-zone-free detection optical path. It has a built-in signal conditioning circuit, which integrates an LM393 comparator to convert light intensity changes into standard PNP pulse signals. The sensor is preferably a DC three-wire PNP output type, which has the characteristics of anti-interference and signal stability.

[0060] The U-shaped photoelectric sensor continuously emits an infrared beam from its emitting end, which is received by the receiving end directly opposite, thus forming a stable "optical path" within the U-shaped groove. When an oil droplet falls from the outlet of the oil collection funnel and passes through this U-shaped groove, it momentarily blocks the light beam, causing a sharp drop in the light intensity received by the receiving end. The sensor's internal circuitry converts this change in light intensity into an electrical pulse signal output. This non-contact detection method avoids direct oil contamination of the sensor's optical components, offering advantages such as long lifespan, fast response, and resistance to contamination, thus solving the problems of easy failure and frequent maintenance required by contact sensors.

[0061] Specifically, the field acquisition unit also includes a sensor mounting clamp, which includes an upper retaining ring for holding the outlet of the oil collecting funnel (2), a lower screw ring for holding the mouth of the oil collecting bottle (5), and a clamping groove for fixing the U-shaped photoelectric sensor.

[0062] The sensor mounting clamp acts as both a connector and a positioner. Its upper retaining ring and lower threaded ring respectively grip the neck (outlet) of the oil collecting funnel and the mouth of the oil collecting bottle, thus physically determining the relative positions of the funnel, sensor, and oil collecting bottle. The clamping groove is used to fix the U-shaped photoelectric sensor body, ensuring that the center of its U-shaped groove is precisely aligned directly below the funnel outlet. Figure 7 As shown, this structure ensures that the falling path of the oil droplets will inevitably pass through the detection optical path of the sensor, achieving non-destructive, stable and precisely aligned installation, and solving the problems of easy displacement and misalignment leading to missed detection when the sensor is fixed alone.

[0063] Furthermore, such as Figure 8 The oil collection bottle (5) is a transparent container, made of transparent glass or oil-resistant plastic. It is cylindrical in shape and has clear volume markings on the side wall, which makes it easy to observe the oil quality and roughly check the amount of oil leakage. The bottle mouth is matched with the lower screw ring of the sensor mounting clamp to achieve a sealed connection and prevent oil droplets from splashing or odors from spreading.

[0064] Specifically, such as Figure 9 The field acquisition unit also includes a first support (11) and a second support (12). The upper surfaces of the first support (11) and the second support (12) are arc-shaped surfaces that are adapted to the outer contour of the horizontal cylinder of the butterfly valve (16), and the arc-shaped surfaces are engaged with the outer surface of the cylinder. The first support (11) is provided with a first crossbeam (9), and the second support (12) is provided with a second crossbeam (10). The first crossbeam (9) and the second crossbeam (10) are arranged opposite to each other. The bottom of the oil collecting funnel (2) is supported on the first crossbeam (9) and the second crossbeam (10).

[0065] The first support (11) and the second support (12) are made of metal or high-strength engineering plastic and have a rod-shaped or frame-like structure. During installation, they are positioned by engaging with the outer surface of the horizontal cylinder at both ends of the butterfly valve (16) through the arc-shaped surface of the upper surface, and are rigidly connected to the butterfly valve (16) by bolts and other fasteners. The first crossbeam (9) and the second crossbeam (10) are fixed on the first support (11) and the second support (12) respectively, and together they form a stable support platform. The bottom of the oil collecting funnel (2) is fixedly installed on this support platform.

[0066] This installation structure, through the direct rigid connection between the bracket and the butterfly valve body, ensures that the entire field acquisition unit and the oil seepage point maintain a constant relative position. The oil collection funnel (2) is firmly supported in the correct position by the crossbeam, which can effectively resist the vibration during equipment operation and ensure that its opening is aligned with the oil seepage point such as the butterfly valve sealing surface for a long time and accurately, thereby realizing reliable and continuous oil seepage collection and solving the monitoring failure problem caused by loose installation or displacement.

[0067] Furthermore, the field acquisition unit also includes a signal terminal box (6), the outer shell of which is made of ABS flame-retardant insulating material with a protection level of IP65. It is square or rectangular in shape and has an inlet and an outlet on its surface. The inlet is equipped with a waterproof connector and a sealing ring to ensure sealing performance in a humid outdoor environment. The inside is equipped with a signal junction terminal for centralized access to the signal line of the photoelectric counting sensor assembly (4) to realize signal regularization and conversion, and provides a reliable interface for easy connection with the signal transmission line (8). The inlet is connected to the photoelectric counting sensor assembly (4) through the signal transmission line (8), and the outlet is connected to the control panel (7) through the signal transmission line (8).

[0068] Specifically, the control panel (7) integrates an Internet of Things wireless communication module, which is used to send oil leakage data, early warning information and equipment status to a remote monitoring platform.

[0069] In one specific embodiment, the control panel (7) has a square or rectangular cabinet structure, and the outer shell is made of metal or flame-retardant plastic. The surface is equipped with a display screen, operation buttons and a reset button. The internal components include an embedded processor, a signal processing module, a wireless communication module and an interface area. The interface area is equipped with a 485 communication interface, an IoT wireless communication module (supporting 4G) and a switch / pulse input interface, which can realize data transmission between devices, remote wireless networking and external signal acquisition. The power interface is adapted to the DC power supply of the substation to ensure operational stability. The signal transmission line (8) is a shielded cable with anti-interference, aging resistance and corrosion resistance. The cable length is adapted according to the on-site installation distance (it can meet the transmission requirements of several meters to tens of meters). Both ends are equipped with connectors that are compatible with the signal terminal box (6) and the control panel (7) interface to ensure the reliability of signal transmission.

[0070] After completing local data calculations and early warning judgments, the control panel sends data packets to the cloud or a remote monitoring center platform via a built-in IoT wireless communication module (such as 4G / NB-IoT) according to a preset protocol. This allows maintenance personnel to view the oil leakage status, historical curves, and alarm information of each transformer butterfly valve in real time on a computer or mobile phone without being physically present on-site. It achieves remote centralized monitoring and intelligent management of the status, greatly improving the speed and efficiency of maintenance response and solving the problems of information silos and delayed response in traditional methods.

[0071] Example 2

[0072] This embodiment provides a working method for the transformer butterfly valve oil leakage monitoring device described in the embodiment, including the following steps:

[0073] The insulating oil seeping from the transformer butterfly valve is collected and gathered by the oil collection funnel (2), so that it forms oil droplets at the outlet of the funnel;

[0074] The oil droplet falls and passes through the detection area of ​​the photoelectric counting sensor assembly (4). The sensor detects the oil droplet passing event and generates a corresponding pulse signal.

[0075] The pulse signal is transmitted to the remote control panel (7) via the signal transmission line (8);

[0076] The control panel (7) receives and records the pulse signals, calculates the real-time oil seepage rate by the time interval between adjacent pulse signals, and obtains the cumulative oil seepage amount by accumulating the number of pulse signals.

[0077] The control panel (7) compares the real-time oil seepage rate and / or the cumulative oil seepage amount with a preset threshold. When the threshold is exceeded, an early warning message is generated and issued.

[0078] The control panel (7) sends the oil seepage data and early warning information to the remote monitoring platform via the wireless communication module.

[0079] The working principle of this invention is as follows:

[0080] When the device is operating, a small amount of insulating oil seeping from the sealing surface of the transformer butterfly valve first drips or is absorbed into the oil collection funnel. Guided by the guide grooves inside the funnel, the oil converges towards the bottom center and gradually forms droplets that fall from the oil leakage holes. The falling droplets pass through... Figure 6 The detection optical path of the precision-installed U-shaped photoelectric sensor shown is momentarily blocked by the infrared beam. The sensor converts this optical change into a clear electrical pulse signal. This pulse signal is transmitted via shielded cable to the control panel located in the main control room or cabinet. The microprocessor in the control panel captures each pulse and records the precise moment of its occurrence. By calculating the time difference between two consecutive pulses, the real-time oil seepage frequency (e.g., "5 seconds per drop") can be obtained; by accumulating the number of all historical pulses, the cumulative number of oil drops can be obtained. The system has preset oil seepage rate thresholds corresponding to defect levels such as "normal," "serious," and "critical" (e.g., a drip rate faster than 5 seconds / drop is considered critical). The control panel compares the real-time calculated oil seepage rate with these thresholds. Once the threshold is exceeded, a local audible and visual alarm is immediately triggered, and the alarm information and detailed oil seepage data (rate, cumulative amount, time) are simultaneously uploaded to the remote monitoring platform via the Internet of Things (IoT) module. Maintenance personnel can view the status in real time on the platform or mobile APP, obtain accurate quantitative data, and thus judge the severity of defects and formulate scientific maintenance strategies. This realizes intelligent management of the entire process of status perception, risk assessment and maintenance decision-making for transformer butterfly valve oil leakage problems, and promotes the transformation of transformer operation and maintenance from passive maintenance to proactive prevention.

[0081] As shown in Table 1, according to the State Grid Corporation's standard defect database for primary equipment in substations, transformer oil leakage defects are classified into the following three categories.

[0082]

[0083] As shown in the table above, a slight oil leak without forming oil droplets is classified as a general defect; a leak rate of no more than 5 seconds per drop and a normal oil level are also classified as general defects; a leak rate of more than 5 seconds per drop and a normal oil level are classified as serious defects; and a leak that has formed an oil flow, or a leak rate of more than 5 seconds per drop and an oil level below the lower limit, is classified as a critical defect. This classification standard can serve as the basis for setting early warning thresholds and can also be used as a reference for remote monitoring platforms in defect classification and maintenance decisions.

[0084] In the description of this specification, the terms "connection", "installation", "fixing", "setting", etc. are interpreted broadly. For example, "connection" can be a fixed connection or an indirect connection through an intermediate component without affecting the relationship between components and the technical effect. It can also be an integral connection or a partial connection. In such cases, those skilled in the art can understand the specific meaning of the above terms in this invention or invention according to the specific circumstances.

[0085] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A transformer butterfly valve oil leakage monitoring device, characterized in that, include: The on-site data collection unit is used to receive, collect, and detect leaking oil. It includes an oil collection funnel (2), a photoelectric counting sensor assembly (4), and an oil collection bottle (5). The oil collection funnel (2) is used to collect and guide the insulating oil leaking from the butterfly valve, causing it to form oil droplets at the outlet. The photoelectric counting sensor assembly (4) is located below the outlet of the oil collection funnel (2) and is used to detect the falling oil droplets in a non-contact manner and generate pulse signals. The oil collection bottle (5) is located below the photoelectric counting sensor assembly (4) and is used to collect the oil droplets. The remote control analysis unit includes a control panel (7) and a signal transmission line (8); the control panel (7) is connected to the photoelectric counting sensor assembly (4) through the signal transmission line (8) to receive the pulse signal and calculate the oil seepage rate and / or cumulative oil seepage based on the pulse signal, and is also used for early warning and remote data communication.

2. The transformer butterfly valve oil leakage monitoring device as described in claim 1, characterized in that, The field collection unit also includes a funnel protective cover (1), which covers the top of the oil collecting funnel (2) to prevent rainwater and dust from entering.

3. The transformer butterfly valve oil leakage monitoring device as described in claim 2, characterized in that, The funnel protective cover (1) is a split structure with symmetrical splicing of two half-covers. The edge of the cover is provided with screw holes for docking and fixing, and a sealing structure is provided at the docking edge.

4. The transformer butterfly valve oil leakage monitoring device as described in claim 2, characterized in that, The top of the funnel protective cover (1) is provided with an operation hole (13) and a detachable butterfly rod operation cap (3). The operation hole (13) is used for the butterfly rod (15) of the transformer to pass through.

5. The transformer butterfly valve oil leakage monitoring device as described in claim 1, characterized in that, The inner cavity of the oil collecting funnel (2) is provided with an inclined guide groove, and the end of the guide groove converges at the oil leakage hole (14) at the bottom.

6. The transformer butterfly valve oil leakage monitoring device as described in claim 1, characterized in that, The photoelectric counting sensor assembly (4) includes a U-shaped photoelectric sensor. The transmitting end and receiving end of the U-shaped photoelectric sensor are arranged opposite each other to form a detection optical path. When the oil droplet passes through the detection optical path, it blocks the infrared light and triggers a pulse signal.

7. The transformer butterfly valve oil leakage monitoring device as described in claim 6, characterized in that, The field acquisition unit also includes a sensor mounting clamp, which includes an upper retaining ring for holding the outlet of the oil collecting funnel (2), a lower screw ring for holding the mouth of the oil collecting bottle (5), and a clamping groove for fixing the U-shaped photoelectric sensor.

8. The transformer butterfly valve oil leakage monitoring device as described in claim 1, characterized in that, The field acquisition unit also includes a first support (11) and a second support (12). The upper surfaces of the first support (11) and the second support (12) are arc-shaped surfaces that are adapted to the outer contour of the horizontal cylinder of the butterfly valve (16), and the arc-shaped surfaces are engaged with the outer surface of the cylinder. The first support (11) is provided with a first crossbeam (9), and the second support (12) is provided with a second crossbeam (10). The first crossbeam (9) and the second crossbeam (10) are arranged opposite to each other. The bottom of the oil collecting funnel (2) is supported on the first crossbeam (9) and the second crossbeam (10).

9. The transformer butterfly valve oil leakage monitoring device as described in claim 1, characterized in that, The control panel (7) integrates an Internet of Things wireless communication module, which is used to send oil leakage data, early warning information and equipment status to the remote monitoring platform.

10. A method for operating the transformer butterfly valve oil leakage monitoring device as described in any one of claims 1-9, characterized in that, Includes the following steps: The insulating oil seeping from the transformer butterfly valve is collected and gathered by the oil collection funnel (2), so that it forms oil droplets at the outlet of the funnel; The oil droplet falls and passes through the detection area of ​​the photoelectric counting sensor assembly (4). The sensor detects the oil droplet passing event and generates a corresponding pulse signal. The pulse signal is transmitted to the remote control panel (7) via the signal transmission line (8); The control panel (7) receives and records the pulse signals, calculates the real-time oil seepage rate by the time interval between adjacent pulse signals, and obtains the cumulative oil seepage amount by accumulating the number of pulse signals. The control panel (7) compares the real-time oil seepage rate and / or the cumulative oil seepage amount with a preset threshold. When the threshold is exceeded, an early warning message is generated and issued. The control panel (7) sends the oil seepage data and early warning information to the remote monitoring platform via the wireless communication module.

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