Power transformer oil conservator monitoring device

Abstract

The utility model relates to the technical field of oil conservator monitoring, and particularly discloses a power transformer oil conservator monitoring device which comprises a first oil conservator arranged at the top of a main transformer body, the first oil conservator comprises an oil cavity and an air bag, the oil cavity is connected with a first pipeline used for being communicated with the main transformer body, the air bag is communicated with a second pipeline, and the second pipeline is communicated with a second pipeline. The other end of the second pipeline is provided with a respirator and a first temperature and pressure sensor, and real-time data feedback is monitored through the first temperature and pressure sensor so that the smooth air inlet or exhaust state of the respirator can be obtained. According to the utility model, the monitoring accuracy can be improved, the reliability is higher, and the conditions of false oil level, dead oil level and the like are avoided.

Description

Technical Field

[0001] This utility model relates to the field of oil tank monitoring technology, and more specifically, to a power transformer oil tank monitoring device. Background Technology

[0002] Transformer oil conservator monitoring is a technology used in power systems to monitor the condition of the insulating oil inside the transformer oil conservator (oil tank) in real time or periodically, aiming to ensure the safe and stable operation of the transformer. Abnormal oil conservator conditions can cause serious problems and require real-time monitoring. Low oil level: leads to insufficient insulation, causing partial discharge or short circuits. High oil level: increases pressure, potentially causing oil leakage or even rupture.

[0003] Existing technology uses contact monitoring, which can be directly installed on the oil tank, but requires drilling, which may lead to leakage over a long period of time. The mechanical structure has poor reliability, and components such as the float and connecting rod are prone to damage and jamming, resulting in false oil level and dead oil level conditions. This often leads to problems such as inaccurate measurement results or large deviations from the remote transmission signal during operation. Utility Model Content

[0004] The purpose of this invention is to provide a power transformer oil conservator monitoring device that can improve monitoring accuracy, increase reliability, and avoid false oil level and dead oil level conditions.

[0005] This utility model is achieved through the following technical solution: a power transformer oil conservator monitoring device, including a first oil conservator located on the top of the main transformer body. The first oil conservator includes an oil cavity and an air bag. The oil cavity is connected to a first pipeline for communicating with the main transformer body. The air bag is connected to a second pipeline, and the other end of the second pipeline is provided with a breather and a first temperature and pressure sensor. The first temperature and pressure sensor monitors real-time data feedback to obtain the air intake or exhaust status of the breather.

[0006] Furthermore, it also includes a tap changer oil conservator, which is located on the top of the main transformer body, and is externally connected to a first valve and a second temperature and pressure sensor.

[0007] Furthermore, a first three-way ball valve is provided between the first valve and the second temperature and pressure sensor.

[0008] Furthermore, the first valve and the first three-way ball valve are connected by a flange, and a seal, connecting bolts and a backstop gasket are provided between the flanges of the first valve and the first three-way ball valve.

[0009] Furthermore, a three-way connector is provided between the respirator and the first temperature and pressure sensor, and a connector and a sealing gasket are provided between the second pipeline and the three-way connector.

[0010] Furthermore, the airbag and the second pipeline are located at the top of the oil chamber, and the first pipeline is connected to the bottom of the oil chamber.

[0011] Furthermore, it also includes an oil drain pipe, which is located at the bottom of the main transformer body, and is equipped with a third temperature and pressure sensor and a second three-way ball valve.

[0012] Furthermore, a connecting flange is provided between the second three-way ball valve and the third temperature and pressure sensor for connection.

[0013] Furthermore, a third pipeline is provided at the bottom of the oil chamber, and a fourth temperature and pressure sensor and an oil drain port are provided at one end of the third pipeline.

[0014] The technical solution of this utility model has at least the following advantages and beneficial effects: By setting a first oil tank and a tap changer oil tank outside the main transformer body, and setting a temperature and pressure sensor at one end of the second pipeline of the first oil tank to work with a breather, this utility model can achieve more accurate monitoring of the oil pressure inside the main transformer body, ensuring the safe operation of the main transformer body and having better reliability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the power transformer oil tank monitoring device of this utility model;

[0016] Figure 2 This is a partially enlarged schematic diagram of the second temperature and pressure sensor at the tap changer oil tank in this utility model;

[0017] Figure 3 This is a partially enlarged schematic diagram of the respirator in this utility model.

[0018] Reference numerals in the attached diagram: 1-Main transformer body, 2-First oil conservator, 21-Airbag, 22-Oil chamber, 3-First pipeline, 4-Second pipeline, 5-First temperature and pressure sensor, 6-Breaser, 61-Connector, 62-Sealing gasket, 7-Tap switch oil conservator, 8-Second temperature and pressure sensor, 9-First three-way ball valve, 10-First valve, 101-Connecting bolt, 102-Anti-reverse washer, 11-Three-way connector, 12-Drain pipe, 13-Third temperature and pressure sensor, 14-Second three-way ball valve, 15-Third pipeline, 16-Drain port, 17-Fourth temperature and pressure sensor. Detailed Implementation

[0019] The following description, in conjunction with specific embodiments, provides further details. Figures 1-3As shown, this embodiment is a power transformer oil conservator monitoring device, including a first oil conservator 2 located on top of the main transformer body 1. The first oil conservator 2 includes an oil chamber 22 and an air bladder 21. The oil chamber 22 is connected to a first pipeline 3 for communication with the main transformer body 1. The air bladder 21 is connected to a second pipeline 4, and the other end of the second pipeline 4 is equipped with a breather 6 and a first temperature and pressure sensor 5. The first temperature and pressure sensor 5 monitors real-time data feedback to obtain the unobstructed air intake or exhaust status of the breather 6. Specifically, the insulating oil in the main transformer body 1 expands or contracts in volume due to changes in oil temperature. When the temperature of the main transformer body 1 increases, some insulating oil will enter the oil chamber 22 along the first pipeline 3, squeezing the air bladder 21 to shrink. The second pipeline 4 discharges the gas from the airbag 21 through the breather 6; and when the temperature drops, the oil pressure and oil level in the main transformer body 1 decrease, so the airbag 21 is inflated by drawing in external air through the second pipeline 4 via the breather 6, thus achieving pressure balance. The first temperature and pressure sensor 5 mainly serves to monitor whether the breather 6 is unobstructed, which is very important. If the breather 6 is not unobstructed, the pressure of the first temperature and pressure sensor 5 will rise when the temperature rises, indicating that there is a fault or defect in the breather 6, resulting in inaccurate oil level. It needs to be maintained and adjusted to restore its normal function, thus realizing the early warning of oil conservator abnormality. Its monitoring accuracy is high, which more effectively ensures the normal operation of the main transformer body 1.

[0020] like Figure 1 As shown, this embodiment also includes a tap changer oil conservator 7, which is located on the top of the main transformer body 1. The tap changer oil conservator 7 is externally connected to a first valve 10 and a second temperature and pressure sensor 8. Specifically, the core function of the tap changer oil conservator 7 (specifically referring to the on-load tap changer oil conservator 7) is to optimize the connectivity between the oil chamber and the oil conservator through structural design, solve the problem of gas being difficult to expel from the oil chamber of the main transformer body 1, and ensure the safe operation of the tap changer. The second temperature and pressure sensor 8 is used to detect the internal pressure of the main transformer body 1, and this signal determines whether the first valve 10 is opened or closed.

[0021] Alternatively, a first three-way ball valve 9 is provided between the first valve 10 and the second temperature and pressure sensor 8, and this first three-way ball valve 9 is used to connect the three components.

[0022] like Figure 2 As shown, in some embodiments, the first valve 10 and the first three-way ball valve 9 are connected by a flange, which makes disassembly and installation more convenient. When the first three-way ball valve 9 is damaged, it is easier to replace. Furthermore, a connecting bolt 101 and a backstop gasket 102 are provided between the flanges of the first valve 10 and the first three-way ball valve 9, so that the connection is evenly stressed and the connecting bolt 101 is prevented from loosening and leaking. On this basis, a sealing element can be added to further ensure that the connection is secure. This sealing element can be a rubber ring or a rubber gasket, etc.

[0023] like Figure 3As shown, in some embodiments, a three-way connector 11 is provided between the respirator 6 and the first temperature and pressure sensor 5, and a connector 61 and a sealing gasket 62 are provided between the second pipeline 4 and the three-way connector 11. Specifically, the two ends of the three-way connector 11 are respectively connected to the first temperature and pressure sensor 5 and the second pipeline 4. The first temperature and pressure sensor 5 can monitor the air pressure in the airbag 21. Since the three-way connector 11 is inserted into the second pipeline 4, in order to avoid air leakage at the connection point and inaccurate pressure monitoring, the connector 61 is provided to work with the sealing gasket 62 to tighten it.

[0024] like Figure 1 As shown, since the density of gas is less than that of liquid, the air bag 21 and the second pipe 4 are located at the top of the oil chamber 22, and the first pipe 3 is connected to the bottom of the oil chamber 22, which is more conducive to the discharge of fluid.

[0025] This embodiment also includes an oil drain pipe 12, which is located at the bottom of the main transformer body 1. The oil drain pipe 12 is equipped with a third temperature and pressure sensor 13 and a second three-way ball valve 14. Specifically, when the breather 6 is blocked, causing the insulating oil pressure in the main transformer body 1 to be too high, it can feed back parameters to the control system through the third temperature and pressure sensor 13, so that the system can implement early warning and further improve the safe operation of the main transformer body 1.

[0026] It is worth mentioning that an adapter flange is provided between the second three-way ball valve 14 and the third temperature and pressure sensor 13 for connection, making connection and disassembly relatively convenient.

[0027] To avoid the danger of excessive oil pressure in the oil chamber 22, a third pipeline 15 is provided at the bottom of the oil chamber 22. A fourth temperature and pressure sensor 17 and an oil drain port 16 are provided at one end of the third pipeline 15. When the fourth temperature and pressure sensor 17 detects that the pressure in the oil chamber 22 is too high, it feeds back the data to the control system. The system compares the parameters of the temperature and pressure sensors at various locations and then implements early warning to prevent potential safety hazards.

[0028] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A power transformer oil pillow monitoring device, characterized by: The first oil pillow (2) is arranged on the top of the main transformer body (1), the first oil pillow (2) comprises an oil cavity (22) and a gas bag (21), the oil cavity (22) is connected with the first pipeline (3) for communication with the main transformer body (1), the gas bag (21) is communicated with the second pipeline (4), and the other end of the second pipeline (4) is provided with a breather (6) and a first temperature and pressure sensor (5), and the breather (6) is monitored by the first temperature and pressure sensor (5) to obtain the air inlet or exhaust unobstructed state.

2. The power transformer oil pillow monitoring device of claim 1, wherein: The tap changer oil pillow (7) is arranged on the top of the main transformer body (1), and the tap changer oil pillow (7) is externally connected with a first valve (10) and a second temperature and pressure sensor (8).

3. The power transformer oil pillow monitoring device of claim 2, wherein: The first three-way ball valve (9) is arranged between the first valve (10) and the second temperature and pressure sensor (8).

4. The power transformer oil pillow monitoring device of claim 3, wherein: The first valve (10) and the first three-way ball valve (9) are connected through flanges, and a sealing element, a connecting bolt (101) and a retreat pad (102) are arranged between the flanges of the first valve (10) and the first three-way ball valve (9).

5. The power transformer oil pillow monitoring device of claim 1, wherein: The three-way communicator (11) is arranged between the breather (6) and the first temperature and pressure sensor (5), and the connecting piece (61) and the sealing pad (62) are arranged between the second pipeline (4) and the three-way communicator (11).

6. The power transformer oil pillow monitoring device of claim 1, wherein: The gas bag (21) and the second pipeline (4) are arranged on the top of the oil cavity (22), and the first pipeline (3) is connected to the bottom of the oil cavity (22).

7. The power transformer oil pillow monitoring device of claim 1, wherein: The oil drain pipe (12) is arranged on the bottom of the main transformer body (1), and the third temperature and pressure sensor (13) and the second three-way ball valve (14) are arranged on the oil drain pipe (12).

8. The power transformer oil pillow monitoring device of claim 7, wherein: The second three-way ball valve (14) and the third temperature and pressure sensor (13) are connected through the adapter flange.

9. The power transformer oil pillow monitoring device of claim 1, wherein: The third pipeline (15) is arranged at the bottom of the oil cavity (22), one end of the third pipeline (15) is provided with the fourth temperature and pressure sensor (17) and the oil discharge port (16).

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