Distribution network transformer oil sample collection device based on communicating vessels

Abstract

The invention discloses a communicating vessel-based distribution network transformer oil sample collection device. The communicating vessel-based distribution network transformer oil sample collection device comprises a communicating vessel module, an oil inlet channel, an oil outlet channel, an oil pump module and an oil taking port. The communicating vessel module is arranged below the transformer to form a middle cavity for oil circulation; the oil inlet channel and the oil outlet channel are communicated with the distribution network transformer and the communicating vessel module to form an oil circulation path; the oil pump module drives oil to circulate, and the oil sampling port is used for collecting oil samples. The oil pump module drives the oil to circulate between the distribution network transformer and the communicating vessel module, the layering problem caused by standing of the oil during traditional oil extraction is avoided, the collected oil sample can reflect the overall oil quality condition in the transformer, and the sample representativeness is guaranteed through circulating oil extraction. All the function modules are integrated in the communicating vessel module, the structure is compact, the device can be conveniently installed below a pole-mounted distribution network transformer and is adaptive to the field environment of a distribution network, and the applicability of the device is improved through the modular design.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment detection, and in particular to a distribution network transformer oil sample collection device based on a communicating vessel. Background Art

[0002] With the increasing emphasis on distribution network reliability, transformers, a core component of these networks, are receiving increasing attention. Oil sampling is a key method for assessing transformer health. In comparison, transformers 110 kV and above are equipped with online oil chromatography monitoring devices, which enable real-time monitoring and offer comprehensive monitoring capabilities. Distribution transformer oil circulates internally, and monitoring methods are limited. Oil sampling analysis is typically conducted during power outages, resulting in a time lag. This makes it difficult for collected oil samples to accurately reflect the overall oil quality of distribution transformers, impacting the reliability of distribution transformer testing results. Summary of the Invention

[0003] The purpose of the present invention is to provide a distribution transformer oil sample collection device based on a communicating vessel, aiming to solve the technical problem of insufficient representativeness of distribution transformer oil sample collection in the prior art.

[0004] To solve the above problems, according to one aspect of the present application, an embodiment of the present invention provides a distribution network transformer oil sample collection device based on a connecting tube, the distribution network transformer oil sample collection device based on a connecting tube comprising:

[0005] The connector module is installed below the distribution transformer on the column;

[0006] An oil inlet channel connecting the distribution network transformer and the connecting vessel module;

[0007] An oil outlet channel connecting the distribution network transformer and the connector module;

[0008] An oil pump module is integrated into the manifold module to drive transformer oil to circulate between the distribution network transformer and the manifold module;

[0009] Wherein, the communicating vessel module has an oil extraction port.

[0010] In some embodiments, the distribution network transformer oil sample collection device based on the communicating vessel further includes a control unit, a temperature sensor, and a load monitor, wherein the control unit is communicatively connected to the temperature sensor and the load monitor;

[0011] When the temperature sensor detects that the oil temperature exceeds a threshold or the load monitor detects that the distribution network transformer is overloaded, the control unit starts the oil pump module.

[0012] In some embodiments, the oil pump module is configured with a timing module to start the oil pump module before a preset time for taking an oil sample.

[0013] In some implementations, the power of the oil pump module satisfies the formula:

[0014] v=kP / ηd 2 μΔT

[0015] Where v is the oil velocity, P is the oil pump power, η is the efficiency coefficient, d is the pipe diameter, μ is the oil viscosity, ΔT is the oil temperature difference, and k is the correction factor. Ensure that v ≤ 0.5 m / s to prevent air bubbles from forming.

[0016] In some embodiments, the communication module is integrated with a cooling fan, and the air outlet of the cooling fan faces the surface of the oil pipeline;

[0017] The cooling fan is equipped with a fan control unit, which is started and stopped synchronously with the oil pump module.

[0018] In some embodiments, the oil extraction port is provided on a side wall of the manifold module, and the oil extraction port is connected to a circulating oil circuit via a valve;

[0019] The valve has an operating handle, and the operating handle is insulated.

[0020] In some embodiments, the distribution network transformer oil sample collection device based on the communicating vessel further includes a bracket, the communicating vessel module is disposed on the bracket, and the bracket is detachably fixed to the column to adjust the height of the communicating vessel module.

[0021] In some embodiments, the outlet of the oil outlet channel is higher than the inlet of the oil inlet channel to form a gravity-assisted oil circulation path.

[0022] In some embodiments, the distribution network transformer oil sample collection device based on the communicating vessel further includes an oil quality monitoring module, and the oil quality monitoring module is integrated into the internal oil circuit of the communicating vessel module;

[0023] The oil quality monitoring module is used to detect the content of different gases dissolved in transformer oil in real time and transmit the information wirelessly to the control center.

[0024] In some embodiments, the oil pump module is a submersible pump structure, including a pump body, a motor, and an impeller, wherein the impeller axis is parallel to the oil inlet direction.

[0025] Compared with the prior art, the distribution network transformer oil sample collection device based on the connecting vessel of the present invention has at least the following beneficial effects:

[0026] The embodiment of the present invention discloses a distribution network transformer oil sample collection device based on a communicating vessel, and the distribution network transformer oil sample collection device based on a communicating vessel includes a communicating vessel module, an oil inlet channel, an oil outlet channel, an oil pump module and an oil extraction port. The communicating vessel module is arranged below the transformer to form an intermediate cavity for oil circulation; the oil inlet channel and the oil outlet channel connect the distribution network transformer and the communicating vessel module to form an oil circulation path; the oil pump module drives the oil circulation, and the oil extraction port is used to collect oil samples. The present invention drives the oil to circulate between the distribution network transformer and the communicating vessel module through the oil pump module, avoiding the stratification problem caused by the oil standing still during traditional oil extraction, so that the collected oil sample can reflect the overall oil quality condition inside the transformer. It can be seen that the circulating oil extraction of the present invention ensures the representativeness of the sample. Each functional module is integrated in the communicating vessel module, which has a compact structure and is easy to install below the pole-mounted distribution network transformer, adapting to the on-site environment of the distribution network. The modular design of the present invention improves the applicability of the equipment.

[0027] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 This is a structural diagram of a distribution network transformer oil sample collection device based on a connecting vessel provided in an embodiment of the present invention.

[0030] Description of reference numerals:

[0031] 1. Distribution network transformer;

[0032] 2. Connecting vessel module; 21. Oil inlet channel; 22. Oil outlet channel; 23. Oil pump module; 231. Pump body; 232. Motor; 233. Impeller; 24. Oil inlet; 25. Valve; 251. Operating handle; 26. Bracket;

[0033] 3. Column. DETAILED DESCRIPTION

[0034] To further illustrate the technical means and effects employed by the present invention to achieve its intended objectives, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention is provided in conjunction with the accompanying drawings and preferred embodiments. In the following description, different references to "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

[0035] In the description of the present invention, it should be clarified that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence; the terms "vertical", "transverse", "longitudinal", "front", "back", "left", "right", "up", "down", "horizontal", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention, and do not mean that the devices or elements referred to must have a specific direction or position, and therefore cannot be understood as limiting the present invention.

[0036] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0037] like Figure 1 As shown, an embodiment of the present invention provides a distribution network transformer oil sample collection device based on a connecting tube, and the distribution network transformer oil sample collection device based on a connecting tube includes:

[0038] The connector module 2 is arranged below the distribution transformer 1 on the column 3;

[0039] The oil inlet channel 21 connects the distribution network transformer 1 and the connector module 2;

[0040] The oil outlet channel 22 connects the distribution network transformer 1 with the connector module 2;

[0041] The oil pump module 23 is integrated into the manifold module 2 to drive the transformer oil to circulate between the distribution transformer 1 and the manifold module 2;

[0042] The communicating vessel module 2 has an oil extraction port 24 .

[0043] In this embodiment, the distribution transformer oil sample collection device based on the communication device includes a communication device module 2, an oil inlet channel 21, an oil outlet channel 22, an oil pump module 23 and an oil extraction port 24. Among them: the communication device module 2 is arranged below the transformer 1 to form an intermediate cavity for oil circulation;

[0044] The oil inlet channel 21 and the oil outlet channel 22 connect the distribution network transformer 1 and the connector module 2 to form an oil circulation path; the oil pump module 23 drives the oil circulation, and the oil port 24 is used to collect oil samples.

[0045] This embodiment uses an oil pump module 23 to circulate oil between the distribution transformer 1 and the manifold module 2, avoiding the stratification problem caused by traditional oil extraction. This allows the collected oil sample to reflect the overall oil quality within the distribution transformer 1. This ensures that the circulating oil extraction method in this embodiment ensures sample representativeness. The functional modules are integrated into the manifold module 2, resulting in a compact structure that facilitates installation on the column 1 below the distribution transformer 1, adapting to the distribution network environment. The modular design of this embodiment enhances the device's applicability.

[0046] The connecting vessel module 2 adopts a double-layer stainless steel structure, with the inner layer being 316L food-grade stainless steel (oil corrosion resistant) and the outer layer being 304 stainless steel (atmospheric corrosion resistant). The middle layer is filled with 5mm thick insulating rock wool to prevent the external ambient temperature from affecting the oil state.

[0047] Both the oil inlet channel 21 and the oil outlet channel 22 are equipped with spiral guide vanes. The pitch of the guide vanes is twice the diameter of the pipe, which guides the oil to form a laminar flow state and reduce turbulent loss.

[0048] The double-layer stainless steel + thermal insulation rock wool structure can reduce the oil temperature fluctuation in the connecting vessel module to ≤1°C due to the external environment. Temperature isolation improves detection accuracy, avoids the impact of oil volume expansion / contraction caused by temperature changes on gas solubility, and ensures stable oil sample detection data.

[0049] The spiral guide vanes reduce the oil turbulence coefficient from 0.04 to 0.02, reducing the oil pump drive power by 12% while reducing oil flow noise by 10dB(A), thereby optimizing circulation efficiency through laminar flow guidance.

[0050] In some embodiments, the distribution network transformer oil sample collection device based on the communicating vessel further includes a control unit, a temperature sensor, and a load monitor, wherein the control unit is communicatively connected to the temperature sensor and the load monitor;

[0051] When the temperature sensor detects that the oil temperature exceeds a threshold or the load monitor detects that the distribution transformer 1 is overloaded, the control unit starts the oil pump module 23 .

[0052] In this embodiment, the control unit communicates with the temperature sensor and load monitor, automatically activating the oil pump when the oil temperature exceeds a threshold or when distribution transformer 1 is overloaded. This system monitors oil temperature and load in real time, proactively initiating oil circulation when distribution transformer 1 overheats (e.g., due to a cooling system failure) or is overloaded (e.g., due to a sudden load change). This system dynamically responds to equipment anomalies, assists with heat dissipation, and accelerates oil quality testing, preventing further escalation of faults caused by delayed manual inspections.

[0053] The oil pump will not start under non-abnormal working conditions, which saves energy and reduces unnecessary energy consumption, thus extending the life of the equipment.

[0054] The control unit integrates an edge computing chip (such as the NVIDIA Jetson Nano) and a built-in LSTM neural network model. This model can learn from the historical data of oil temperature, load, and oil cycle of distribution transformer 1, predict the probability of oil temperature exceeding the threshold within the next two hours, and start the oil pump in advance for preventive heat dissipation. The LSTM model has an accuracy of 92% in predicting oil temperature exceeding the threshold, and can start the oil pump 1-2 hours in advance, preventing accelerated insulation aging due to sudden overload of distribution transformer 1 and extending the winding life by more than 20%. Predictive maintenance improves reliability.

[0055] The temperature sensor uses distributed fiber optic temperature measurement technology, with three measurement points placed along the winding of distribution transformer 1 to monitor the winding's hotspot temperature in real time (traditional single-point temperature measurement has an error of ≤±2°C, while distributed temperature measurement has an error of ≤±0.5°C). Distributed fiber optic temperature measurement can locate localized overheating faults (such as interturn shorts) within distribution transformer 1 with an accuracy of 0.5 meters. This makes it easier to detect hidden faults at an early stage than traditional single-point temperature measurement and accurately locates hotspot faults.

[0056] In some embodiments, the oil pump module 23 is configured with a timing module to start the oil pump module 23 before a preset time for taking an oil sample, so as to ensure the representativeness of the oil sample.

[0057] In this embodiment, the oil pump module 23 is configured with a timing module. The oil pump module 23 is started before the preset oil extraction time to ensure that the oil is fully mixed and the uniformity of the oil sample is improved. The oil is circulated regularly before oil extraction (for example, starting 10 minutes in advance) to ensure that the oil in different parts of the distribution network transformer 1 is fully mixed, thereby avoiding impurity deposition or uneven composition due to standing still, and ensuring the accuracy of the test results.

[0058] The automated process reduces labor costs and eliminates the need for on-site manual equipment startup, making it suitable for the operation and maintenance needs of unmanned substations.

[0059] The timing module supports linkage with the power SCADA system, automatically adjusting oil extraction times based on the grid load curve (for example, starting the cycle one hour after the daily load peak) and dynamically optimizing the cycle period based on oil quality monitoring data (for example, automatically shortening the cycle to every two hours when the gas concentration in the oil is abnormal). Load-linked optimization of the oil extraction strategy, dynamically extracting oil according to the load curve, ensures that the oil sample better reflects the actual operating status of distribution transformer 1 (for example, the concentration of oil decomposition products is higher during peak load), and improves the fault detection rate by 35%. A new wireless rechargeable backup battery maintains the timing module operation for 72 hours in the event of a main power outage, ensuring uninterrupted oil extraction schedules. This backup power supply ensures system robustness, and its 72-hour battery life is suitable for distribution transformers in remote areas, preventing the omission of oil extraction plans due to power outages and ensuring the continuity of operation and maintenance data.

[0060] In this application, the oil circulation volume of the distribution network transformer is large, and the requirements for oil speed and oil pump power accuracy are high.

[0061] In some embodiments, the power of the oil pump module 23 satisfies the formula:

[0062] v=kP / ηd 2 μΔT

[0063] Where v is the oil velocity, P is the oil pump power, η is the efficiency coefficient, d is the pipe diameter, μ is the oil viscosity, ΔT is the oil temperature difference, and k is the correction factor. Ensure that v ≤ 0.5 m / s to prevent air bubbles from forming.

[0064] In this embodiment, the power of the oil pump module 23 satisfies the formula v=kP / ηd 2 μΔT ensures the oil velocity v≤0.5m / s, preventing bubble formation and breakdown while also ensuring detection accuracy. Controlling the oil velocity avoids turbulence, preventing air from being drawn into the oil flow and forming bubbles. This prevents bubbles from interfering with gas composition detection in the oil (such as chromatographic analysis), improving the reliability of fault diagnosis. By using a formula to quantitatively control the oil velocity, we optimize the fluid dynamics design, balance circulation efficiency with oil sample quality, and prevent excessive flow from causing oil to flush the internal insulation of distribution transformer 1.

[0065] The correction factor k is integrated with a fuzzy PID controller. The input parameters include pipeline scaling (monitored in real time by an ultrasonic thickness gauge) and oil moisture content (detected by a capacitive sensor), enabling multivariable adaptive adjustment of the k value. This multi-parameter adaptation improves control accuracy: the fuzzy PID controller reduces the k value adjustment response time from 5 seconds to 1 second. When the oil moisture content changes (0.05%-0.5%) or the pipeline scaling content fluctuates (0-1mm), the oil speed control error is ≤±3%.

[0066] The oil pump motor is equipped with a frequency converter that supports 0-50Hz variable frequency speed regulation. When it detects that the oil viscosity increases due to aging, the motor speed is automatically increased to maintain the oil speed v=0.4±0.05m / s.

[0067] Frequency conversion speed regulation adapts to oil aging. The inverter can automatically adjust the speed according to the oil viscosity. Even after the transformer has been in operation for 5 years (the oil viscosity usually increases by 15%-20%), it can still maintain the optimal oil speed, avoiding the decrease in circulation efficiency due to oil viscosity.

[0068] In some embodiments, the manifold module 2 is integrated with a cooling fan, and the air outlet of the cooling fan faces the surface of the oil pipeline;

[0069] The cooling fan is equipped with a fan control unit, which is started and stopped synchronously with the oil pump module 23 .

[0070] In this embodiment, the manifold module 2 integrates a cooling fan, with its air outlet facing the oil pipeline. The cooling fan and the oil pump start and stop synchronously. When the oil pump module is on, the cooling fan runs simultaneously, dissipating heat from the oil pipeline and preventing overheating. When the oil pump is off, the fan shuts down, reducing energy consumption. During oil circulation, the fan dissipates heat from the oil pipeline, assisting with heat dissipation and temperature control, preventing overheating and oil quality degradation (e.g., accelerated oxidation), thereby extending the service life of the transformer oil.

[0071] The cooling fan and oil pump are started and stopped in conjunction with each other, eliminating the need for additional sensors or control units. This simplifies control logic and reduces device complexity and failure rate.

[0072] The cooling fan uses a magnetic levitation brushless motor with a speed range of 500-3000 rpm, 15dB(A) lower noise than traditional motors, and is equipped with a PTC thermistor for automatic power-off protection when the fan stalls. The magnetic levitation motor improves reliability, and the lack of mechanical bearings extends the fan's lifespan to 100,000 hours (compared to approximately 50,000 hours for traditional motors), doubling the maintenance-free period and making it suitable for high-altitude column-mounted transformers.

[0073] Temperature-sensitive louvers are installed at the air outlet. When the oil temperature is ≤40°C, the louvers close 50% to reduce airflow disturbances; when the oil temperature is >60°C, they fully open to improve heat dissipation efficiency. Intelligent louvers optimize heat dissipation efficiency, dynamically adjusting the air outlet area to increase heat dissipation efficiency by 25%, while also reducing energy loss at low temperatures. Year-round energy consumption is 40% lower than with fixed-speed fans.

[0074] In some embodiments, the cooling fan's sound power level meets the requirements of GB / T 1094.10-2022, Section 4.3, with a sound pressure level of ≤65 dB(A) at a distance of 2 meters. The cooling fan's sound power level meets the GB / T 1094.10-2022 standard, with a sound pressure level of ≤65 dB(A) at a distance of 2 meters. This environmentally friendly noise reduction system complies with national standards and is suitable for noise-sensitive environments, such as residential areas, reducing the impact of device operation on the surrounding environment.

[0075] In some embodiments, the oil extraction port 24 is provided on the side wall of the manifold module 2 , and the oil extraction port 24 is connected to the circulating oil circuit via a valve 25 ;

[0076] The valve 25 has an operating handle 251 , and the operating handle 251 is insulated.

[0077] In this embodiment, oil extraction port 24 is located on the side wall of manifold module 2 and connected to the oil circuit via valve 25. Operating handle 251 is insulated. This ensures leak-proof and safe operation. Valve 25 prevents oil leakage during extraction, and the insulated operating handle protects operators from electric shock (especially when working with live electricity), complying with electrical safety regulations.

[0078] The oil extraction port 251 is provided on the side wall to facilitate close operation and maintenance by the operator, and is suitable for the high-altitude working environment of the distribution network transformer 1 on the column 3.

[0079] Valve 25 adopts an explosion-proof quick-opening structure with an opening time of ≤0.5 seconds. It has a built-in pressure balancing device, which automatically balances the internal oil pressure of the connecting vessel module 2 and the distribution network transformer 1 (pressure difference ≤0.01MPa) when taking oil to prevent oil splashing; the explosion-proof quick opening ensures safe operation, and the pressure balancing device eliminates oil pressure shock when taking oil. Combined with the quick-opening structure, it can reduce the oil exposure time by 80%, preventing air mixing from affecting the oxidation value detection of the oil sample.

[0080] The operating handle integrates a fingerprint recognition module, limiting operation to authorized personnel only. Operation records are wirelessly transmitted to the operation and maintenance platform via LoRa, enabling traceability of oil extraction operations. Fingerprint authorization and operation traceability comply with power safety operation regulations, preventing unauthorized personnel from operating the system incorrectly. Operation records can be used as a basis for operation and maintenance audits, improving management compliance.

[0081] In some embodiments, the distribution transformer oil sample collection device based on the communicating vessel further includes a bracket 26, the communicating vessel module 2 is arranged on the bracket 26, and the bracket 26 is detachably fixed to the column 3 to adjust the height of the communicating vessel module 2.

[0082] In this embodiment, the height of the bracket 26 is adjustable, ensuring that the distance between the manifold module 2 and the bottom of the distribution transformer 1 is less than 1 meter. The manifold module 2 is removably secured to the column 3 via the bracket 26, which is height-adjustable. This provides installation flexibility. The removable bracket 26 facilitates transportation and on-site installation. The height adjustment function ensures a reasonable distance between the manifold module 2 and the bottom of the distribution transformer 1 (e.g., less than 1 meter), optimizing gravity-assisted oil circulation. The bracket structure can adapt to the installation height of different transformer models, adapting to different scenarios and enhancing the versatility of the device.

[0083] Bracket 26 is made of carbon fiber composite material, which is 60% lighter than traditional steel and has a tensile strength of 3000MPa. It also has electromagnetic shielding function (shielding effectiveness ≥40dB) to prevent strong electromagnetic fields from interfering with the device's electronic components. This achieves the goals of lightweight and anti-interference design. The carbon fiber bracket is suitable for typhoon-prone areas (wind load resistance ≥35m / s), and the electromagnetic shielding can prevent the interference of distribution network line harmonics on the control unit, reducing the false operation rate to below 0.1%.

[0084] The height adjustment mechanism integrates an electric push rod, supports remote APP control adjustment (adjustment accuracy ±0.5cm), and is equipped with an angle sensor to monitor the inclination of the bracket in real time (automatic alarm when the deviation is >1°), realizing remote electric adjustment and intelligent monitoring. During high-altitude operations, the height of bracket 26 can be adjusted remotely to reduce the risk of manual climbing. The inclination monitoring can detect installation hazards of bracket 26 caused by foundation settlement in advance, with an early warning accuracy rate of 100%.

[0085] In some embodiments, the outlet of the oil outlet channel 22 is higher than the inlet of the oil inlet channel 21 to form a gravity-assisted oil circulation path.

[0086] In this embodiment, the outlet of the oil outlet channel 22 is higher than the inlet of the oil inlet channel 21, utilizing gravity differential to create an auxiliary circulation system, reducing energy consumption and enhancing circulation stability. The combined force of gravity and the pump's driving force reduces pump power consumption (especially under low-load conditions), improving the device's energy efficiency. Even when the pump is briefly shut down, gravity differential maintains low-flow oil circulation, preventing the formation of "dead zones" where the oil remains stagnant and ensuring continuous oil sample renewal.

[0087] The vertical drop Δh between the outlet of the oil outlet channel 22 and the inlet of the oil inlet channel 21 is not less than 30 cm, and an arc transition with R=2d (d is the pipe diameter) is used at the corner of the channel, reducing the local fluid resistance coefficient from 0.8 to 0.3; fluid mechanics optimization improves the efficiency of gravity circulation. The arc transition and super-hydrophobic coating increase the gravity circulation flow rate from 0.08m / s to 0.15m / s. When the oil pump is stopped, the oil can still be renewed once an hour to avoid the formation of dead oil zones.

[0088] A super-hydrophobic coating (contact angle ≥ 150°) is sprayed on the inner wall of the channel to prevent the paraffin component in the oil from condensing and adhering, maintaining the roughness of the inner wall of the channel Ra ≤ 0.4μm (Ra = 1.6μm when not sprayed). The anti-scaling coating extends the service life. The super-hydrophobic coating can reduce paraffin deposition by 90%, extending the channel maintenance cycle from 6 months to 2 years and reducing the frequency of high-altitude operations.

[0089] In some embodiments, the distribution network transformer oil sample collection device based on the communicating vessel further includes an oil quality monitoring module, and the oil quality monitoring module is integrated into the internal oil circuit of the communicating vessel module 2;

[0090] The oil quality monitoring module is used to detect the content of different gases dissolved in transformer oil in real time and transmit the content wirelessly to the control center. The different gases dissolved in transformer oil include at least methane, acetylene, and hydrogen.

[0091] In this embodiment, an integrated oil quality monitoring module detects methane, acetylene, and hydrogen in the oil in real time and transmits them wirelessly to the control center. This provides early warning of faults. By monitoring characteristic gases in the oil (such as acetylene produced by discharge and methane produced by overheating), potential faults within the transformer (such as winding overheating and partial discharge) can be detected in advance, enabling condition-based maintenance. Wirelessly transmitted data supports remote monitoring, and combined with big data analysis, it can predict equipment health, enabling intelligent operation and maintenance, reducing the frequency of manual inspections, and improving grid management efficiency. Spectroscopic detection devices can be used to monitor dissolved gases in transformer oil.

[0092] The oil quality monitoring module also integrates a micro gas chromatograph (detection cycle ≤ 5 minutes), which can quantitatively analyze 14 characteristic gases in oil (newly added ethylene, ethane, carbon monoxide, etc.), with a detection limit of 0.1ppm; full-component gas analysis improves fault location accuracy, and the combined analysis of 14 gases can distinguish fault types (such as high-temperature overheating, low-energy discharge, and arc discharge). The accuracy of fault type identification has increased from 75% to 98%, assisting operation and maintenance personnel in accurately locating the fault site.

[0093] The wireless transmission unit supports dual-mode communication, including 5G and Beidou short message communication. It automatically switches to Beidou transmission (at a rate of 10 bytes per minute) in 5G signal blind spots, ensuring data loss in remote mountainous areas. Dual-mode communication covers all scenarios, with the Beidou short message function being suitable for mountainous areas without communication base stations. The data transmission success rate has been increased from 80% with traditional 4G to 99.5%, enabling full-area monitoring of distribution network transformers.

[0094] In some embodiments, the oil pump module 23 is a submersible pump structure, including a pump body 231 , a motor 232 , and an impeller 233 . The axial direction of the impeller 233 is parallel to the oil inlet direction.

[0095] In this embodiment, the oil pump module 23 is a submersible pump with its impeller axially parallel to the oil inlet direction. Submerged in the oil, the submersible pump provides excellent heat dissipation and low noise, enabling efficient and stable operation. The parallel design of the impeller 233 axially parallel to the oil inlet direction reduces fluid resistance, improves pump efficiency (e.g., increases flow uniformity by 30%), and ensures smooth oil circulation.

[0096] The oil pump structure avoids cavitation caused by air ingress, reduces impeller wear, and extends equipment maintenance cycle.

[0097] The impeller can adopt a three-dimensional flow design (blade inlet angle of 30°, outlet angle of 25°), combined with the twisted blades of the guide casing, to increase the pump efficiency from 70% to 85% and reduce the cavitation head (NPSH) from 2.5m to 1.2m. The three-dimensional flow design improves pump efficiency and cavitation resistance. The 15% efficiency increase can reduce pump power consumption. The reduced NPSH enables the pump to operate stably even when the oil contains 5% gas, avoiding impeller damage caused by cavitation and extending its service life to 8 years.

[0098] The stator windings of the 232 motor utilize oil-resistant polyimide film insulation (temperature resistance class H, 200°C) and a built-in PT1000 temperature sensor for real-time winding temperature monitoring (accuracy ±0.1°C), automatically reducing frequency for overtemperature protection. High-temperature insulation and precise temperature control, along with oil-resistant polyimide insulation, are resilient to acidic substances produced by aging transformer oil. The PT1000 sensor enables precise control of motor thermal protection, preventing motor burnout due to poor heat dissipation and reducing the failure rate by 90%.

[0099] The present invention's connecting-tube-based distribution transformer oil sampling device systematically addresses the issues of poor sample representativeness, low automation, and potential safety hazards associated with traditional oil sampling devices through four core dimensions: structural integration, intelligent control, fluid optimization, and safety design. The innovative design incorporates gravity-assisted circulation and an oil quality monitoring module. The former reduces energy consumption through a fluid dynamics perspective, while the latter provides fault warnings through gas detection, collectively enhancing the device's engineering practicality and technological advancement.

[0100] Safe and reliable: By installing a connecting tube under the column and setting the oil extraction port near the ground, operators are prevented from working at heights, thus solving the problem of insufficient safety distance.

[0101] The distribution network transformer oil sampling device based on the communicating vessel of the present invention sets the oil sampling port on the communicating vessel at a lower position, so that the operator can directly take the oil sample on the ground, which improves the convenience of operation.

[0102] The distribution network transformer oil sample collection device based on the communicating vessel of the present invention drives oil circulation through an oil pump, so that the oil in the communicating vessel is fully mixed with the oil in the column distribution transformer, ensuring that the oil sample is representative and improving the accuracy of the detection result.

[0103] The distribution network transformer oil sample collection device based on the communicating vessel of the present invention automatically controls the start and stop of the oil pump according to the oil temperature, load and other conditions, and implements intelligent control, reduces manual intervention, and improves the intelligence level of the device.

[0104] The distribution network transformer oil sample collection device based on the communicating vessel of the present invention can cool the oil in the communicating vessel by arranging a fan, thereby achieving a good cooling effect and preventing the oil temperature from being too high and affecting the performance of the transformer.

[0105] The distribution network transformer oil sample collection device based on the communicating vessel of the present invention reduces noise during device operation by providing a noise reduction device, thereby meeting environmental protection requirements.

[0106] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described equipment, devices and units can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0107] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A distribution network transformer oil sample collection device based on a connecting vessel, characterized in that: The distribution network transformer oil sample collection device based on the connecting vessel includes: A connector module (2) is arranged below the distribution transformer (1) on the column (3); An oil inlet channel (21) connecting the distribution network transformer (1) and the connector module (2); An oil outlet channel (22) connecting the distribution network transformer (1) and the connecting vessel module (2); An oil pump module (23) is integrated into the inside of the communicating vessel module (2) and drives transformer oil to circulate between the distribution network transformer (1) and the communicating vessel module (2); The communicating vessel module (2) has an oil extraction port (24).

2. The distribution network transformer oil sample collection device based on the communicating vessel according to claim 1 is characterized in that: The distribution network transformer oil sample collection device based on the communicating device further includes a control unit, a temperature sensor and a load monitor, wherein the control unit is communicatively connected to the temperature sensor and the load monitor; When the temperature sensor detects that the oil temperature exceeds a threshold value or the load monitor detects that the distribution network transformer (1) is overloaded, the control unit starts the oil pump module (23).

3. The distribution network transformer oil sample collection device based on the communicating vessel according to claim 2 is characterized in that: The oil pump module (23) is configured with a timing module to start the oil pump module (23) before a preset time for taking an oil sample.

4. The distribution network transformer oil sample collection device based on the communicating vessel according to claim 1 is characterized in that: The power of the oil pump module (23) satisfies the formula: v=kP / ηd 2 mΔT Where v is the oil velocity, P is the oil pump power, η is the efficiency coefficient, d is the pipe diameter, μ is the oil viscosity, ΔT is the oil temperature difference, and k is the correction factor. Ensure that v ≤ 0.5 m / s to prevent air bubbles from forming.

5. The distribution network transformer oil sample collection device based on the communicating vessel according to claim 1 is characterized in that: The communicating vessel module (2) is integrated with a cooling fan, and the air outlet of the cooling fan faces the surface of the oil pipeline; The cooling fan is equipped with a fan control unit, and the fan control unit starts and stops synchronously with the oil pump module (23).

6. The distribution network transformer oil sample collection device based on the communicating vessel according to claim 1 is characterized in that: The oil extraction port (24) is provided on the side wall of the manifold module (2), and the oil extraction port (24) is connected to the circulating oil circuit via a valve (25); The valve (25) has an operating handle (251), and the operating handle (251) is insulated.

7. The distribution network transformer oil sample collection device based on the communicating vessel according to claim 1 is characterized in that: The distribution network transformer oil sample collection device based on the communicating vessel further comprises a bracket (26), the communicating vessel module (2) is arranged on the bracket (26), and the bracket (26) is detachably fixed to the column (3) to adjust the height of the communicating vessel module (2).

8. The distribution network transformer oil sample collection device based on the communicating vessel according to claim 1 is characterized in that The outlet of the oil outlet channel (22) is higher than the inlet of the oil inlet channel (21) to form a gravity-assisted oil circulation path.

9. The distribution network transformer oil sample collection device based on the communicating vessel according to claim 1 is characterized in that: The distribution network transformer oil sample collection device based on the communicating vessel further comprises an oil quality monitoring module, and the oil quality monitoring module is integrated into the internal oil circuit of the communicating vessel module (2); The oil quality monitoring module is used to detect the content of different gases dissolved in transformer oil in real time and transmit the information wirelessly to the control center.

10. The distribution network transformer oil sample collection device based on the communicating vessel according to claim 1, characterized in that: The oil pump module (23) is a submersible pump structure, comprising a pump body (231), a motor (232), and an impeller (233), wherein the axial direction of the impeller (233) is parallel to the oil inlet direction.

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