Oil chromatography on-line monitoring device

Abstract

The utility model provides an oil chromatography on-line monitoring device, which belongs to the technical field of electric insulating oil on-line monitoring and comprises an oil chromatography on-line monitoring device main body and an oil pipeline, the oil chromatography on-line monitoring device main body is connected with a transformer through the oil pipeline, and the oil pipeline is laid on the ground. The oil pipeline is sleeved with an aluminum plastic pipe, a heat shrink pipe, a corrugated pipe and a groove box from inside to outside. Wherein the aluminum-plastic pipe is arranged on the oil pipeline in a sleeving mode to protect the oil pipeline, the heat shrink pipe is arranged on the aluminum-plastic pipe in a sleeving mode to conduct insulation treatment, and the corrugated pipe is arranged on the heat shrink pipe in a sleeving mode and penetrates into the groove box to conduct hard protection on the oil pipeline; a strip-shaped hole is formed in the side face of the groove box so that oil can flow out of the strip-shaped hole after oil leakage of the oil pipeline, and workers can find the oil leakage condition conveniently. Therefore, the multi-layer insulating media of the aluminum plastic pipe, the heat shrink pipe, the corrugated pipe and the groove box are used for protecting the oil pipeline, the current state of the oil pipeline can be checked conveniently in the mode that the oil pipeline is laid on the ground in an exposed mode, and the abnormal condition of the oil pipeline can be found in time.

Description

Technical Field

[0001] This utility model relates to the field of online monitoring technology for power insulating oil, and specifically to an online oil chromatography monitoring device. Background Technology

[0002] Oil-immersed transformers are crucial equipment in power systems. Online oil chromatography monitoring devices, as essential accessories for oil-immersed transformers, primarily monitor the composition of the oil within the transformer body to prevent internal discharge faults that could lead to transformer tripping or explosions, causing severe damage to the power system. Currently, in relevant substations and converter stations both domestically and internationally, the oil pipelines for online oil chromatography monitoring devices are concealed within the emergency oil sump. This makes it difficult for maintenance personnel to inspect them, and leaks in the pipelines cannot be detected and addressed immediately, posing a safety hazard and potentially leading to equipment tripping incidents due to oil leaks. Summary of the Invention

[0003] In view of this, the present invention provides an online oil chromatography monitoring device to solve the technical problem that existing oil pipelines are concealed in accident oil pools, making it inconvenient for maintenance personnel to inspect them and unable to detect abnormalities in the oil pipelines in a timely manner.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] An online oil chromatography monitoring device includes a main body and an oil pipeline. The main body is connected to a transformer via the oil pipeline. The oil pipeline is laid on the ground and is fitted with an aluminum-plastic tube, a heat-shrink tubing, a corrugated tube, and a casing from the inside out. The aluminum-plastic tube protects the oil pipeline, the heat-shrink tubing insulates it, and the corrugated tube extends from the heat-shrink tubing into the casing for rigid protection. A slotted hole is provided on the side of the casing to allow oil to flow out in case of leakage, facilitating detection of leaks by personnel.

[0006] Preferably, a heat tracing cable is provided between the aluminum-plastic tube and the heat shrink tubing. The heat tracing cable is wrapped and fixed to the aluminum-plastic tube by flame-retardant aluminum tape, and the heat shrink tubing is sleeved on the aluminum-plastic tube and the heat tracing cable.

[0007] Preferably, the slot box includes a lid, a body, and a partition; one end of the lid is connected to one end of the body by a hinge, the side wall of the body has multiple strip holes, and the partition is disposed in the middle of the interior of the body along the length of the slot box.

[0008] Preferably, the slot box further includes a first arc-shaped support and a second arc-shaped support. The first arc-shaped support is bolted to the inner surface of the box cover, and the second arc-shaped support is bolted to the inner surface of the bottom of the box body, so that the oil pipeline is suspended and installed in the slot box by the first arc-shaped support and the second arc-shaped support.

[0009] Preferably, an optical fiber sensor is provided at one end of the inner surface of the cover to detect whether the oil pipeline is leaking oil due to overcurrent breakdown.

[0010] Preferably, the inner wall of the box is provided with multiple infrared cameras along the direction of the slotted holes to detect whether the oil pipeline is leaking oil due to overcurrent breakdown through infrared images.

[0011] Preferably, an oil leakage monitoring and alarm device is installed inside the corrugated pipe.

[0012] Preferably, the oil leakage monitoring and alarm device is a liquid level sensor, and the number of liquid level sensors is set to multiple, and the multiple liquid level sensors are distributed at intervals along the extension direction of the oil pipeline.

[0013] Preferably, the material of the slot box is stainless steel.

[0014] Preferably, the material of the slot box is transparent tempered glass.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] By laying the oil pipeline on the ground and encasing it in aluminum-plastic tubing, heat-shrink tubing, corrugated tubing, and storage boxes from the inside out, the oil pipeline is protected by multiple layers of insulating media. This exposed laying method allows for easy monitoring of the pipeline's current status, timely detection of any abnormalities, and convenient inspections by staff. This significantly improves inspection efficiency, prevents equipment tripping due to oil leaks in the oil chromatography online monitoring device, and effectively enhances the operational stability of the device. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall installation of the online oil chromatography monitoring device and the transformer of this utility model.

[0018] Figure 2 This is a front view of the oil pipeline structure of this utility model.

[0019] Figure 3 This is a perspective view of the oil pipeline structure of this utility model.

[0020] Figure 4This is a front view of the oil pipeline structure of this utility model with the tank cover open.

[0021] Figure 5 This is a perspective view of the oil pipeline structure of this utility model with the tank cover open.

[0022] In the figure: main body 100 of oil chromatography online monitoring device, oil pipeline 210, transformer 300, aluminum-plastic pipe 220, heat shrink tubing 230, corrugated pipe 240, slot box 250, box cover 251, box body 252, partition 253, first arc-shaped support 254, second arc-shaped support 255, fiber optic sensor 256, infrared camera 257, heat tracing cable 260, and grid head 270. Detailed Implementation

[0023] The technical solutions and effects of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0024] Please also refer to Figure 1 and Figure 2 An online oil chromatography monitoring device includes a main body 100 and an oil pipeline 210. The main body 100 is connected to a transformer 300 via the oil pipeline 210. The oil pipeline 210 is laid on the ground, and from the inside out, an aluminum-plastic tube 220, a heat-shrinkable tube 230, a corrugated tube 240, and a slotted box 250 are respectively fitted onto the oil pipeline 210. The aluminum-plastic tube 220 is fitted onto the oil pipeline 210 to protect it, the heat-shrinkable tube 230 is fitted onto the aluminum-plastic tube 220 for insulation, and the corrugated tube 240 is fitted onto the heat-shrinkable tube 230 and passes through the slotted box 250 to provide rigid protection for the oil pipeline 210. The side of the slotted box 250 has a strip-shaped hole so that oil can flow out through the strip-shaped hole after the oil pipeline 210 leaks, making it easier for staff to detect oil leaks.

[0025] This invention involves an exposed installation of the oil pipeline in an online oil chromatography monitoring device. The oil pipeline is laid on the ground, and aluminum-plastic tubing, heat-shrink tubing, corrugated tubing, and a storage box are fitted onto it from the inside out. First, the corrosion resistance and flexibility of the aluminum-plastic tubing adapt to the pipeline's laying route, providing initial protection. Second, heat-shrink tubing insulates the pipeline, providing excellent insulation, sealing, and protection. Third, the flexibility and extensibility of the corrugated tubing resist various stresses and deformations, providing good pressure and impact resistance, protecting the pipeline from environmental damage. Finally, the storage box provides rigid protection for the pipeline. Thus, the multi-layered protection of the oil inlet and outlet through the aluminum-plastic tubing, heat-shrink tubing, corrugated tubing, and storage box effectively protects the oil pipeline. Simultaneously, the storage box has slotted holes on its side; if an oil leak occurs, the oil can flow out through these holes, allowing personnel to detect the leak promptly. This invention, by laying the oil pipeline in the open on the ground, allows for easy monitoring of the current status of the oil pipeline, timely detection of any abnormalities, and facilitates inspections by staff, greatly improving inspection efficiency and preventing equipment tripping due to oil leaks in the oil pipeline of the online oil chromatography monitoring device, thus effectively enhancing the operational stability of the online oil chromatography monitoring device.

[0026] Furthermore, please refer again. Figure 2 A heating tape 260 is also installed between the aluminum-plastic pipe 220 and the heat-shrink tubing 230. The heating tape 260 is fixed to the aluminum-plastic pipe 220 by wrapping it with flame-retardant aluminum tape, and the heat-shrink tubing 230 is sleeved on the aluminum-plastic pipe 220 and the heating tape 260. The heating tape 260 is a heating device that converts electrical energy into heat energy. It is usually composed of a conductive core wire, an insulation layer, a metal shielding layer, and an outer sheath. When current passes through the conductive core wire, the conductive core wire generates heat due to resistance. This heat is transferred to the outer sheath through the insulation layer and the metal shielding layer, and then the outer sheath transfers the heat to the aluminum-plastic pipe, thereby insulating the oil pipeline. In some embodiments, the heating tape 260 is evenly wrapped or laid on the aluminum-plastic pipe 220 to avoid overlapping or excessive gaps, thereby avoiding excessive local heat concentration. At the same time, an appropriate spacing should be set according to the type of electric heating tape and the specifications of the pipeline. Too small a spacing may cause localized overheating, while too large a spacing may not provide enough heat, affecting the heat tracing effect and potentially damaging the pipes due to overcompensation for heat.

[0027] In some embodiments, the heat tracing cable 260 is wrapped and fixed to the aluminum-plastic tube 220 with flame-retardant aluminum tape, ensuring a tight fit with the aluminum-plastic tube 220 and the oil pipeline 210. The wrapped and fixed aluminum-plastic tube 220 and the heat tracing cable 260 are then inserted into the heat shrink tubing 230. The flame-retardant aluminum tape primarily serves to assist in fixing and enhance heat dissipation. During installation, the flame-retardant aluminum tape firmly adheres the heat tracing cable to the surface of the aluminum-plastic tube, preventing displacement and ensuring effective heat transfer to the area requiring heating. Simultaneously, the flame-retardant aluminum tape has good thermal conductivity, allowing for better dissipation of heat generated by the heat tracing cable, improving heating efficiency. It also provides some moisture protection and insulation, protecting the contact surface between the heat tracing cable and the aluminum-plastic tube.

[0028] In some embodiments, one end of the heating cable 260 is connected to the main body 100 of the online oil chromatography monitoring device, which provides current to the heating cable 260. The other end is connected to a temperature controller, and the grounding wire of the heating cable 260 is connected to a grounding device to ensure the safe operation of the heating cable 260. The temperature controller can monitor the pipeline temperature in real time. When the pipeline temperature reaches a set safety value, it can automatically cut off the power to the heating cable and stop heating; when the temperature falls below the set value, heating is restarted. This not only allows for precise control of the pipeline temperature, preventing the heating cable from continuously heating and causing the pipeline to overheat, thus avoiding damage to the pipeline, but also saves energy, ensuring the system operates safely and energy-efficiently.

[0029] In some implementations, the inner diameter of the aluminum-plastic tube 220 needs to be selected based on the outer diameter of the oil line 210 to prevent the oil line 210 from wobbling inside the aluminum-plastic tube 220 after insertion. When the heat shrink tubing 240 is fitted onto the aluminum-plastic tube 220 and the heating tape 260, the tubing is first subjected to appropriate surface treatment to improve its adhesion to the heat shrink tubing. Then, the heat shrink tubing is fitted onto the aluminum-plastic tube and the heating tape, ensuring correct positioning and uniform tightening. Finally, the hot melt adhesive on the inner surface of the heat shrink tubing is fully melted by heating and tightly bonded to the outer wall of the aluminum-plastic tube and the heating tape, thereby forming a continuous tightening force to ensure the stability of the oil line. Throughout the process, the flame temperature and time must be strictly controlled to avoid unnecessary damage to the tubing.

[0030] Further, please see Figure 3The tank 250 includes a cover 251, a body 252, and a partition 253. One end of the cover 251 is connected to one end of the body 252 via a hinge. Multiple slotted holes are provided on the side wall of the body 252. The partition 253 is positioned in the middle of the interior of the body 252 along its length. The hinged connection between the cover and body allows for easy access for maintenance personnel to inspect the oil lines when leaks are detected. In some embodiments, the oil lines include an inlet pipe and a return pipe, typically made of copper. The partition separates the inlet and return pipes, preventing friction and perforation that could lead to leaks. Furthermore, the partition allows for quick identification of the leaking pipe (inlet or return) by observing the direction of the leak, facilitating accurate repair. Figure 3 The length of the slot in the example is for illustrative purposes only and does not limit the length of the slot in this utility model.

[0031] Further, please see Figure 4 The slot box 250 also includes a first arc-shaped support 254 and a second arc-shaped support 255. The first arc-shaped support 254 is bolted to the inner surface of the box cover 251, and the second arc-shaped support 255 is bolted to the inner surface of the bottom of the box body 252. The oil pipeline is suspended within the slot box by the first arc-shaped support 254 and the second arc-shaped support 255. When inserting the corrugated pipe into the slot box, the box cover can be opened first, and the corrugated pipe placed on the second arc-shaped support. After the corrugated pipe is stably positioned, the box cover is closed. The positions of the first and second arc-shaped supports correspond, with the first arc-shaped support covering the corrugated pipe. This restricts the movement range of the oil pipeline, preventing it from swaying within the slot box and affecting the stable delivery of insulating oil. Simultaneously, suspending the oil pipeline within the slot box also prevents it from applying pressure to the heating cable installed at the bottom, ensuring the normal operation of the heating cable.

[0032] In some embodiments, the number of first arc-shaped support members and second arc-shaped support members is determined according to the length of the oil pipeline, and multiple first arc-shaped support members are evenly arranged on the inner surface of the box cover, and the positions of multiple second arc-shaped support members correspond one-to-one with the positions of multiple first arc-shaped support members, and are also evenly arranged at the bottom of the box body.

[0033] Further, please see Figure 5A fiber optic sensor 256 is installed on one end of the inner surface of the cover 251 to detect whether the oil pipeline is leaking due to overcurrent breakdown. During the transportation of insulating oil in the pipeline, static electricity is generated due to the friction or separation of the insulating oil. This static electricity accumulates in the pipeline. When the static electricity is difficult to discharge, it can easily lead to overcurrent breakdown in the oil pipeline, which causes the temperature around the pipeline to rise. The fiber optic sensor can detect temperature changes, so it can be used to detect whether overcurrent breakdown has occurred in the oil pipeline and promptly identify oil leaks. Specifically, a fiber optic sensor is installed on the inner surface of the cover near the online oil chromatography monitoring device. The output end of the fiber optic sensor is connected to the online oil chromatography monitoring device. When overcurrent breakdown occurs in the oil pipeline, the surface of the corrugated pipe will change temperature. The fiber optic sensor detects the temperature change and sends the temperature change signal to the online oil chromatography monitoring device. The online oil chromatography monitoring device then sends the temperature change signal to the operator, informing them that overcurrent breakdown has occurred in the oil pipeline, thus enabling the operator to promptly detect abnormalities in the oil pipeline.

[0034] Further, please see Figure 5 Multiple infrared cameras 257 are installed on the inner wall of the housing 252 along the direction of the slotted holes to detect whether the oil pipeline is leaking due to overcurrent breakdown using infrared images. To more accurately determine the specific location of the overcurrent breakdown in the oil pipeline, multiple infrared cameras can be evenly installed on the inner wall of the housing. Images captured by the infrared cameras are analyzed, and thermal imaging technology is used to determine whether the pipeline is leaking due to overcurrent breakdown. Specifically, when an overcurrent breakdown occurs in the oil pipeline, the temperature of the broken-down area changes. Images are captured by the infrared cameras and transmitted to the cloud via the cameras' wireless communication modules for viewing by staff. This allows staff to identify areas of abnormal temperature and accurately pinpoint the location of the oil leak.

[0035] Further, please see Figure 2 The bellows 250 is connected to the main body 100 of the online oil chromatography monitoring device via a flange 270. This flange secures the bellows to the online oil chromatography monitoring device, preventing loosening of the connection between the bellows and the device due to external forces or environmental factors, thus ensuring the normal operation of the monitoring device. In some embodiments, a flange with a diameter of φ32 is used.

[0036] Furthermore, due to the limited length of the corrugated pipe, multiple sections are required during use, and each pair of sections needs to be secured together. Specifically, first, check if the mating ends of the two corrugated pipe sections are flat, ensuring that the local gap after the two ends are joined is less than the specified value. Then, grind the outer wall of the pipe at the connection point to remove surface impurities and oxides, ensuring the connection surface is clean. Next, thread the heat shrink tubing onto one end of the two corrugated pipes. Finally, gradually heat from one end, ensuring the heat shrink tubing shrinks evenly and fits tightly against the outer wall of the pipe. Throughout the process, the heating rate and temperature should be strictly controlled to ensure the strength and safety of the connection.

[0037] Furthermore, an oil leak detection and alarm device is installed inside the corrugated pipe. When an oil leak occurs in the pipeline, the oil leak detection and alarm device can provide real-time monitoring and alarm, facilitating timely handling of oil leak problems.

[0038] In some embodiments, the oil leak detection and alarm device is a liquid level sensor, and the number of liquid level sensors is set to multiple, with the multiple liquid level sensors distributed at intervals along the extension direction of the oil pipeline. Specifically, the multiple liquid level sensors are distributed at intervals inside the bellows along the extension direction of the oil pipeline, thereby enabling more comprehensive and efficient monitoring of oil leaks and improving the practicality of the online oil chromatography monitoring device.

[0039] In some implementations, when an oil leak occurs in the pipeline, the level sensor sends a leak signal to the remote monitoring terminal after detecting that the transformer oil level in the bellows exceeds a threshold level. Specifically, the level sensor itself has a preset threshold level. When an oil leak occurs, the leaked transformer oil gradually accumulates in the bellows. Simultaneously, the level sensor monitors the transformer oil level inside the bellows in real time. When the accumulated transformer oil level in the bellows exceeds the threshold level set by the level sensor, the level sensor sends a leak signal to the remote monitoring terminal. Upon receiving the leak signal, the remote monitoring terminal can issue an alarm sound and display the leak information on the terminal, thereby promptly reminding personnel to carry out maintenance and repairs.

[0040] Furthermore, the tank is made of stainless steel, which provides excellent corrosion resistance, enabling long-term stable operation in harsh environments. The high strength of stainless steel allows the tank to withstand significant mechanical stress, requiring less material thickness to bear the same load, thus saving space and cost while ensuring structural stability and durability. During installation, the customized stainless steel tank is installed according to the pre-defined laying route. Two people should be present to carry the stainless steel tank on its side. Care should be taken during installation to prevent damage to the existing oil pipelines. After installation, fire-retardant putty should be used to seal the holes at both ends.

[0041] Furthermore, the tank is made of transparent tempered glass. Transparent tempered glass not only possesses the same corrosion resistance and high strength, but also exhibits certain high-temperature resistance, remaining stable in high-temperature environments. Most importantly, transparent tempered glass offers high transparency, providing a clear view, making it suitable for applications requiring transparent observation. Using transparent tempered glass tanks effectively protects oil pipelines while providing a clear view, improving visibility efficiency and facilitating maintenance and management.

[0042] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.

Claims

1. An online oil chromatography monitoring device, comprising an online oil chromatography monitoring device body and an oil pipeline, wherein the online oil chromatography monitoring device body is connected to a transformer via the oil pipeline, characterized in that, The oil pipeline is laid on the ground, and from the inside out, it is fitted with an aluminum-plastic tube, a heat-shrink tubing, a corrugated tube, and a groove box. The aluminum-plastic tube is fitted onto the oil pipeline to protect it, the heat-shrink tubing is fitted onto the aluminum-plastic tube for insulation, and the corrugated tube is fitted onto the heat-shrink tubing and inserted into the groove box for rigid protection of the oil pipeline. The side of the groove box has a strip-shaped hole so that oil can flow out through the strip-shaped hole in case of oil leakage, making it easy for workers to detect oil leaks.

2. The online oil chromatography monitoring device according to claim 1, characterized in that, A heat tracing cable is also provided between the aluminum-plastic tube and the heat shrink tubing. The heat tracing cable is fixed to the aluminum-plastic tube by wrapping it with flame-retardant aluminum tape, and the heat shrink tubing is sleeved on the aluminum-plastic tube and the heat tracing cable.

3. The online oil chromatography monitoring device according to claim 2, characterized in that, The slot box includes a lid, a body, and a partition; one end of the lid is connected to one end of the body by a hinge, the side wall of the body has multiple slot holes, and the partition is located in the middle of the interior of the body along the length of the slot box.

4. The online oil chromatography monitoring device according to claim 3, characterized in that, The slot also includes a first arc-shaped support and a second arc-shaped support. The first arc-shaped support is bolted to the inner surface of the slot cover, and the second arc-shaped support is bolted to the inner surface of the bottom of the slot body, so that the oil pipeline is suspended and installed in the slot through the first arc-shaped support and the second arc-shaped support.

5. The online oil chromatography monitoring device according to claim 3, characterized in that, A fiber optic sensor is installed at one end of the inner surface of the cover to detect whether the oil pipeline is leaking oil due to overcurrent.

6. The online oil chromatography monitoring device according to claim 5, characterized in that, The inner wall of the box is equipped with multiple infrared cameras along the direction of the slotted holes to detect whether the oil pipeline is leaking oil due to overcurrent breakdown through infrared images.

7. The online oil chromatography monitoring device according to any one of claims 1-6, characterized in that, An oil leak monitoring and alarm device is installed inside the corrugated pipe.

8. The online oil chromatography monitoring device according to claim 7, characterized in that, The oil leak monitoring and alarm device is a liquid level sensor, and the number of liquid level sensors is set to multiple, and the multiple liquid level sensors are distributed at intervals along the extension direction of the oil pipeline.

9. The online oil chromatography monitoring device according to claim 1, characterized in that, The slot is made of stainless steel.

10. The online oil chromatography monitoring device according to claim 1, characterized in that, The slot is made of transparent tempered glass.

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