Gas type transformer oil conservator
By using airbags and nitrogen in the transformer oil pillow to maintain the balance of internal and external air pressure, and combining oxygen detectors, the problem of oil and air barrier failure of oil pillow oil and air is solved, the operation reliability and safety of the transformer are improved, and the manufacturing and installation process is simplified. , avoid false oil levels and leakage.
Patent Information
- Application Number
- CN202220277249.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2022-02-12
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2032-02-12
AI Technical Summary
The oil and air barriers of the existing transformer oil pillows fail, resulting in increased water content in the oil and reduced insulation performance, posing a threat to the safe operation of the power transformer. It also has a complex structure, inconvenient installation and high cost, making it easy to have false oil levels. and leakage problems.
Using gas-type transformer oil pillow, by setting up airbags outside the oil storage device and filling them with nitrogen, using the airbags and nitrogen in the oil storage device to maintain the balance of internal and external air pressure, combined with an oxygen detector, the oxygen content in the oil storage device is monitored in real time to ensure oil Effective isolation from air.
It improves the operating reliability of the transformer, simplifies the manufacturing process of the oil storage device, avoids false oil level phenomena and leakage, realizes intuitive oil level display and remote monitoring, and enhances the safety and reliability of the power transformer.
Smart Images
Figure CN222281739U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a transformer oil pillow, in particular to a gas transformer oil pillow. Background Art
[0002] The transformer oil pillow is composed of a barrier between transformer oil and air and an oil storage device. The oil storage device automatically stores and replenishes oil for the transformer, ensuring that the transformer oil tank is full of oil. When the oil temperature in the transformer oil tank rises and causes the oil to expand, the excess oil flows from the oil tank into the oil storage device, and vice versa. The barrier between transformer oil and air reduces or blocks the contact between transformer oil and air, delaying the oxidation and moisture of transformer oil.
[0003] The existing transformer oil pillows are divided into four types according to the isolation method between transformer oil and air: corrugated type, capsule type, diaphragm type, and open type.
[0004] The corrugated oil pillow uses a metal expander composed of metal corrugated sheets to separate the transformer oil from the external air and provide space for the transformer oil to expand and contract with heat. Its disadvantages are: complex structure, high manufacturing process requirements, inconvenient installation, high cost, non-intuitive oil level observation, and increased leakage probability of the transformer oil tank due to the additional pressure.
[0005] The capsule type oil pillow uses a rubber capsule in the oil storage device to separate the transformer oil from the external air and provide space for the transformer oil to expand and contract due to heat. Its disadvantages are: the capsule core may have cracks and micropores due to material problems, allowing air and moisture to penetrate into the oil in the oil storage device through the capsule and then into the transformer oil tank, causing the water content in the oil to increase, the insulation performance to decrease, and the aging of the insulating oil to accelerate; improper installation or oil filling methods will cause false oil level phenomenon.
[0006] Diaphragm oil pillow uses rubber diaphragm in the oil storage device to separate transformer oil from external air and provide space for transformer oil to expand and contract due to heat and cold. Its disadvantages are: strict requirements on installation quality and maintenance process. Once the rubber material has quality problems, air and moisture will penetrate into the oil and enter the transformer oil tank, causing the water content in the oil to increase, the insulation performance to decrease, and the aging of the insulating oil to accelerate, posing a threat to the safe operation of the power transformer.
[0007] In the open oil pillow, the transformer oil in the oil storage device is connected to the external air, so the insulating oil is easily oxidized and affected by moisture. After long-term operation, the transformer oil will oxidize, posing a great threat to the safety, economy and reliable operation of the transformer. It is only used for small-capacity distribution transformers.
[0008] The failure of the barriers between transformer oil and air of capsule-type and diaphragm-type oil pillows cannot be discovered in time. Although the breathing ports of the above-mentioned oil pillows are equipped with respirators with silica gel particles inside, the gas temperature in the oil storage device is affected by day and night, rain and oil temperature, and the breathing is frequent. The silica gel particles in the respirator have limited ability to absorb moisture and cannot eradicate moisture from entering the oil storage device, posing a threat to the safe operation of the power transformer. Summary of the invention
[0009] The utility model provides a gas transformer oil pillow to solve the defect that the barrier between transformer oil and air fails and threatens the safe operation of the power transformer, eliminates the false oil level phenomenon, and avoids the leakage of the transformer oil tank due to the additional pressure.
[0010] The utility model provides a gas transformer oil pillow, which includes an oil storage device, an air bag, an oxygen detector, and a gas pipe connector. The air bag is arranged outside the oil storage device, and the top of the oil storage device and the air bag are connected by a gas pipe connector and filled with nitrogen inside. The nitrogen and the air bag constitute a barrier between the transformer oil and the outside air. The oil storage device is used for automatic oil storage and oil replenishment of the transformer; the air bag is used to store nitrogen, and the internal and external air pressures are balanced by changing the volume to adjust the air pressure in the oil storage device; the oxygen detector, whose probe is arranged above the inside of the oil storage device, detects the oxygen content of the special gas in the oil storage device in real time to ensure the effectiveness of isolating the transformer oil from the outside air.
[0011] The volume of the airbag should meet the following requirements: at the lowest ambient temperature and when the transformer is out of service, the volume of the airbag does not reach the minimum limit, and there is no negative pressure in the oil storage device; at the highest ambient temperature and when the transformer is fully loaded, the volume of the airbag does not reach the maximum limit, and there is no positive pressure in the oil storage device. The volume of the corrugated film airbag is linearly related to the length of the airbag core. Based on the temperature-volume curve of equal amounts of gas under normal atmospheric pressure, the length position of the corrugated film airbag core at a typical temperature can be marked.
[0012] Preferably, the volume of the airbag is 1.35 to 1.5 times the volume of the oil storage device.
[0013] Preferably, the airbag adopts a horizontal corrugated film airbag core.
[0014] The working process of the gas transformer oil pillow is as follows: when the oil temperature in the transformer oil tank rises, the oil in the oil tank expands, the excess oil flows into the oil storage device, the gas space in the oil storage device becomes smaller, the air pressure in the oil storage device and the connected air bag rises, the internal air pressure is greater than the external air pressure, the volume of the air bag increases, and at the same time, the nitrogen in the oil storage device flows into the air bag until the air pressure inside and outside the air bag is balanced and the volume of the air bag stops increasing; when the oil temperature in the transformer oil tank decreases, the oil in the oil tank shrinks, the insufficient oil is supplemented by the oil storage device, and the gas in the oil storage device As the space becomes larger, the air pressure in the oil storage device and the connected airbag decreases, the internal air pressure is lower than the external air pressure, the volume of the airbag becomes smaller, and at the same time, the nitrogen in the airbag flows to the oil storage device until the air pressure inside and outside the airbag is balanced, and the volume of the airbag stops decreasing; the temperature of the gas in the oil storage device and the airbag changes frequently due to the influence of day and night and rain, and the thermal expansion of the gas causes the air pressure to rise, and the volume of the airbag becomes larger, and vice versa, the volume of the airbag becomes smaller, and the airbag automatically adjusts its own volume according to the pressure difference between the inside and outside of it, so that the pressure of the oil surface in the oil storage device is balanced with that of the outside air.
[0015] Compared with the prior art, the utility model gas transformer oil pillow has the following beneficial effects: the oxygen content of nitrogen above the oil surface in the oil storage device is detected in real time, and the failure of the transformer oil and air barrier can be found in time, which effectively improves the operating reliability of the transformer; the manufacturing process of the oil storage device and the air bag is simple, the oil storage device is an integrated type and is not easy to leak oil, and the respirator is omitted; the oil level display is intuitive, and the false oil level phenomenon will not occur. The oil level is easy to realize remote display and high and low level alarm. The utility model is suitable for new product manufacturing and the transformation of existing oil pillows. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] FIG1 is a schematic diagram of the connection between the oil storage device and the air bag in an embodiment of the utility model.
[0017] FIG. 2 is a schematic structural diagram of an oil storage device according to an embodiment of the utility model.
[0018] FIG. 3 is a schematic structural diagram of an airbag according to an embodiment of the utility model.
[0019] Explanation of reference numerals in the figure: 1-oil storage device, 2-airbag, 11-housing, 12-interface connected to gas relay, 13-refueling and exhaust port, 14-oxygen detector, 15-oil level gauge, 16-pipe port connected to airbag, 17-oil drain port, 18-transformer oil, 19-nitrogen, 21-housing, 22-corrugated film airbag core, 23-transverse suspension rod, 25-pipe port connected to airbag, 31-pipeline, 32-inflating valve DETAILED DESCRIPTION
[0020] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those generally understood by those of ordinary skill in the art to which the present application belongs. The terms used herein are only intended to describe specific embodiments and are not intended to limit the exemplary embodiments according to the present application.
[0021] Figure 1 The oil storage device 1 and the air bag 2 are connected by a pipe 31, and the gas therein can flow mutually. An inflation valve 32 is arranged on the pipe 31.
[0022] Figure 2 It is a structural schematic diagram of an oil storage device of an embodiment of the utility model. The oil storage device 1 is composed of a housing 11, an interface 12 connected to a gas relay, a refueling and exhaust port 13, an oxygen detector 14, an oil level gauge 15, a pipe port 16 connected to an air bag, and an oil discharge port 17. The lower part of the oil storage device 1 stores transformer oil 18, and the upper part is filled with nitrogen 19. The housing 11 of the oil storage device 1 is welded into a sealed body with steel plates, and the refueling and exhaust port 13 and the pipe port 16 connected to the air bag are arranged on the upper part, and the interface 12 connected to the gas relay and the oil discharge port 17 are arranged on the lower part, and the oil level gauge 15 is installed on the side. The upper end of the oil level gauge 15 is connected to the gas in the oil storage device 1, and the lower end is connected to the oil in the oil storage device 1. An oxygen detector 14 is installed above the oil storage device 1, and its probe is arranged above the inside of the oil storage device to detect the oxygen content of nitrogen in the oil storage device and set an over-standard alarm.
[0023] Figure 3 It is a schematic diagram of the structure of the airbag of the embodiment of the utility model, and the airbag is composed of an outer shell 21, a corrugated film airbag core 22, a transverse suspension rod 23, a pipe mouth 25 connected to the airbag, etc. The corrugated film airbag core 22 is installed horizontally, and continuous hanging holes are provided on the upper part thereof, which are hung on the transverse suspension rod 23 respectively. The corrugated film airbag core 22 is filled with nitrogen with stable performance, low price and environmental protection. The side panels and the bottom plate of the airbag shell are provided with ventilation holes to ensure that the outside of the corrugated film airbag core 22 is connected to the outside air, and the aperture of the ventilation holes should be able to prevent small flying insects from entering the inside; one side of the outer shell is detachable, which can facilitate the installation of the corrugated film airbag core 22 inside and the adjustment of the volume of the airbag 2. The volume of the airbag 2 is selected to be equal to 1.5 times the volume of the oil storage device 1. The volume of the airbag 2 is linearly related to the length of the corrugated film airbag core 22. According to the inverse proportionality between the temperature and volume of equal amounts of gas at the same atmospheric pressure, the length position of the typical temperature of the corrugated film airbag core 22 is marked.
[0024] The installation process of the gas transformer oil pillow is as follows:
[0025] After the transformer and the oil pillow are installed, the transformer is filled with oil. After standing, the filling and exhaust port 13 is opened to add oil to the oil storage device 1 until the oil storage device 1 is full of oil. The filling and exhaust port 13 is closed to exhaust the air in the corrugated film airbag core 22. Nitrogen is filled into the corrugated film airbag core 22 through the inflation valve 32. When the length of the corrugated film airbag core 22 reaches the corresponding temperature, the inflation is stopped. The oil drain port 17 is opened to drain the oil, and the oil level is adjusted to the corresponding temperature. At this time, part of the nitrogen in the corrugated film airbag core 22 flows into the upper space of the oil storage device 1, and the volume of the corrugated film airbag core 22 becomes smaller.
[0026] The working process of the gas transformer oil pillow is as follows:
[0027] When the oil temperature in the transformer tank increases, the oil in the tank expands, and the excess oil flows into the oil storage device 1, the space for nitrogen 19 in the oil storage device 1 becomes smaller, the air pressure in the oil storage device 1 and the connected airbag 2 increases, the internal air pressure is greater than the external air pressure, the volume of the airbag 2 increases, and at the same time, the nitrogen in the oil storage device 1 flows to the airbag 2 until the air pressure inside and outside the airbag 2 is balanced, and the volume of the airbag 2 stops increasing;
[0028] When the oil temperature in the transformer tank decreases, the oil in the tank shrinks, and the insufficient oil is supplemented by the oil storage device 1. The gas space in the oil storage device 1 becomes larger, and the air pressure in the oil storage device 1 and the connected airbag 2 decreases. The internal air pressure is lower than the external air pressure, and the volume of the airbag 2 decreases. At the same time, the nitrogen in the airbag 2 flows to the oil storage device until the air pressure inside and outside the airbag is balanced, and the volume of the airbag stops decreasing.
[0029] The temperature of the nitrogen 19 in the oil storage device 1 and the air bag 2 changes frequently due to the influence of day and night and rain. The thermal expansion of the gas causes the air pressure to increase, and the volume of the air bag 2 increases. Conversely, the volume of the air bag 2 decreases. The air bag 2 automatically adjusts its own volume according to the pressure difference between the inside and outside of it, so that the pressure of the oil surface in the oil storage device 1 is balanced with that of the outside air.
[0030] An oxygen detector 14 is installed above the oil storage device 1, and its probe is arranged above the inside of the oil storage device to detect the oxygen content of nitrogen in the oil storage device. If the oil storage device or the air bag leaks, external oxygen enters the inside of the oil storage device 1, and the oxygen detector 14 displays that the oxygen exceeds the standard and gives an alarm.
[0031] Unless otherwise stated, the terms used in any technical solution disclosed in the above utility model to express positional relationships or shapes include states or shapes that are approximate, similar or close thereto.
[0032] Any component provided by the utility model can be assembled from multiple separate components, or can be a separate component manufactured by an integrated forming process.
[0033] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.
Claims
1. A gas transformer oil pillow, characterized in that: The oil pillow includes an oil storage device, an air bag, an oxygen detector, and a gas pipe connector, wherein: The airbag is arranged outside the oil storage device, the upper part of the oil storage device is connected to the airbag by a gas pipe connector and filled with nitrogen, and the airbag and the nitrogen in the oil storage device form a barrier between the transformer oil and the external air; The oxygen detector has a probe arranged above the inside of the oil storage device to detect the oxygen content of the gas in the oil storage device in real time.
2. A gas transformer oil conservator as claimed in claim 1, characterized in that: The airbag adopts a horizontal corrugated film airbag core.
3. A gas transformer oil conservator as claimed in claim 1, characterized in that: The volume of the air bag is 1.35 to 1.5 times the volume of the oil storage device.