Transformer fault alarm device

Abstract

The utility model relates to the technical field of transformers, in particular to a transformer fault alarm device. Comprising a shell communicating pipe, a protective outer cover, a controller, an upper cover plate, an L-shaped plate, a vertical plate and a sensor assembly. The shell communicating pipe is arranged at the upper end of the transformer shell and communicates with the interior of the transformer shell; the upper cover plate is detachably mounted at the upper end of the shell communicating pipe; a first sealing gasket is arranged at the bottom end of the upper cover plate in the circumferential direction; the controller is mounted on the outer side of the upper cover plate; the protective outer cover is rotationally mounted at the upper end of the transformer shell; the L-shaped plate and the vertical plate are both connected with the lower end of the upper cover plate, and an inner cavity of the shell communicating pipe forms a snake-shaped gas channel through the L-shaped plate and the vertical plate; the sensor assembly is installed at the top of the tail end of the gas channel. According to the technical scheme, the L-shaped plate and the vertical plate are arranged, so that a snake-shaped zigzag gas channel is formed in the shell communicating pipe, the probability that oil splashes to the surface of the sensor is greatly reduced, and the service life of the sensor is further prolonged.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to a transformer fault alarm device. Background Technology

[0002] A transformer mainly consists of an iron core, windings, an oil tank, an oil conservator, and insulating bushings. The oil tank is the outer shell of the transformer, containing the iron core and windings and filled with transformer oil, immersing the iron core and windings in the oil. The transformer oil serves as insulation. In large-capacity transformers, cooling oil channels are often provided in the iron core to ensure that the heat generated by the iron core loss can be fully carried away by the insulating oil during circulation, thus achieving a good cooling effect.

[0003] In the prior art, in order to realize the monitoring of internal faults in transformers, such as temperature monitoring, smoke monitoring and oil leakage detection, a detection box is usually set on the top of the transformer shell. The detection box is connected to the inside of the shell, and the sensor is installed in the detection box. However, during the transportation or installation of the transformer, the oil inside the transformer may slosh. When the oil sloshes, it is easy to splash onto the surface of the sensor, which may have a variety of negative impacts on the performance of the sensor and the measurement results. Utility Model Content

[0004] The purpose of this invention is to address the problems existing in the background technology by proposing a transformer fault alarm device.

[0005] The technical solution of this utility model is a transformer fault alarm device, comprising:

[0006] The outer casing connecting pipe is located at the upper end of the transformer casing and connects to the inside of the transformer casing.

[0007] The upper cover plate is detachably installed on the upper end of the outer casing connecting pipe; a first sealing gasket is provided at the bottom end of the upper cover plate along its circumference;

[0008] The controller is installed on the outside of the upper cover.

[0009] The protective cover is rotatably mounted on the upper part of the transformer casing.

[0010] The L-shaped plate and vertical plate connected to the lower end of the upper cover plate form a snake-shaped gas channel through the inner cavity of the outer shell connecting pipe;

[0011] The sensor assembly is installed at the top of the end of the gas channel;

[0012] The liquid level height auxiliary measurement component includes a movable rod that extends through the bottom of an L-shaped plate, and a top plate and a float plate that are respectively connected to the upper and lower ends of the movable rod.

[0013] Preferably, the sensor assembly includes a temperature sensor, a distance sensor, and a smoke sensor.

[0014] Preferably, the controller is a PLC controller or a microprocessor controller, and a signal transceiver is installed on the protective cover. The controller is electrically connected to the temperature sensor, the distance sensor, the smoke sensor, and the signal transceiver.

[0015] Preferably, a lower sealing plate is provided at the bottom of the upper cover plate, and a second sealing gasket is provided around the lower sealing plate, with the second sealing gasket fitting with the inner side of the outer shell connecting pipe.

[0016] Preferably, a third sealing gasket and a fourth sealing gasket are installed on the outer periphery of the L-shaped plate and the outer periphery of the vertical plate, respectively.

[0017] Preferably, the L-shaped plate is equipped with a return oil pipe, and a one-way valve is installed on the return oil pipe.

[0018] Compared with the prior art, the present invention has the following beneficial technical effects: In this technical solution, by setting an L-shaped plate and a vertical plate, a serpentine gas channel is formed inside the outer shell connecting pipe, and the sensor assembly is installed at the top of the end of the gas channel, thereby greatly reducing the probability of oil splashing onto the sensor surface and thus extending the service life of the sensor. Attached Figure Description

[0019] Figure 1 and Figure 2 All of these are schematic diagrams of the structure of this utility model.

[0020] Figure 3 This is a cross-sectional view of the outer shell connecting pipe in this utility model.

[0021] Reference numerals in the attached diagram: 1. Transformer casing; 2. Casing connecting pipe; 3. Protective cover; 4. Controller; 5. Upper cover plate; 6. Lower sealing plate; 71. First sealing gasket; 72. Second sealing gasket; 73. Third sealing gasket; 74. Fourth sealing gasket; 8. L-shaped plate; 9. Movable rod; 10. Top plate; 11. Limiting ring; 12. Floating plate; 13. Oil return pipe; 14. Vertical plate; 15. Temperature sensor; 16. Distance sensor. Detailed Implementation

[0022] Example 1

[0023] like Figures 1-3 As shown in the figure, the transformer fault alarm device proposed in this embodiment includes an outer casing connecting pipe 2, a protective cover 3, a controller 4, an upper cover plate 5, an L-shaped plate 8, a vertical plate 14, a sensor assembly, and a liquid level height auxiliary measurement assembly.

[0024] The outer casing connecting pipe 2 is located at the upper end of the transformer casing 1 and communicates with the interior of the transformer casing 1; the upper cover plate 5 is detachably installed on the upper end of the outer casing connecting pipe 2. The upper cover plate 5 is installed on the outer casing connecting pipe 2 by screws. The quick-release structure allows the sensor assembly to be easily removed from the inside of the outer casing connecting pipe 2; a first sealing gasket 71 is provided around the bottom end of the upper cover plate 5; a lower sealing plate 6 is provided at the bottom end of the upper cover plate 5, and a second sealing gasket 72 is provided around the lower sealing plate 6. The second sealing gasket 72 is clearance-fitted with the inside of the outer casing connecting pipe 2. This arrangement can increase the sealing area of ​​the upper opening of the outer casing connecting pipe 2, thereby improving the sealing effect of the upper opening of the outer casing connecting pipe 2.

[0025] The protective cover 3 is rotatably mounted on the upper end of the transformer housing 1. The protective cover 3 is used to protect the controller 4. In order to achieve heat dissipation, a small hole is opened at the bottom of the protective cover 3.

[0026] Both the L-shaped plate 8 and the vertical plate 14 are connected to the lower end of the upper cover plate 5. The inner cavity of the outer shell connecting pipe 2 forms a snake-shaped gas channel through the L-shaped plate 8 and the vertical plate 14. The outer periphery of the L-shaped plate 8 and the outer periphery of the vertical plate 14 are respectively equipped with a third sealing gasket 73 and a fourth sealing gasket 74. This arrangement is used to improve the sealing between the inner wall of the outer shell connecting pipe 2 and the L-shaped plate 8 and the vertical plate 14.

[0027] The L-shaped plate 8 is equipped with an oil return pipe 13, and a one-way valve is installed on the oil return pipe 13. If a portion of the oil flows into the gas channel through the upper end of the L-shaped plate 8, the oil can be discharged through the oil return pipe 13. The one-way valve only allows the oil to flow out in one direction to prevent the oil from accumulating and increasing inside the gas channel.

[0028] The sensor assembly is installed at the top of the gas channel end. The sensor assembly includes a temperature sensor 15, a distance sensor 16, and a smoke sensor. There are two installation methods for the sensor assembly: one is to install the temperature sensor 15, the distance sensor 16, and the smoke sensor (not shown) inside the outer casing connecting pipe 2; the other is to place the detection probes of the temperature sensor 15, the distance sensor 16, and the smoke sensor inside the outer casing connecting pipe 2, while placing the main body outside the outer casing connecting pipe 2. The controller 4 is installed on the outside of the upper cover plate 5.

[0029] The liquid level height auxiliary measurement component includes a movable rod 9 that moves through the bottom end of the L-shaped plate 8, and a top plate 10 and a float plate 12 that are respectively connected to the upper and lower ends of the movable rod 9. It should be added that a limit ring is connected to the vertical plate, and the movable rod 9 moves through the limit ring 11.

[0030] In this embodiment, in the prior art, when detecting faults in a transformer, a detection box connected to the transformer casing is usually installed on the top of the transformer casing. Multiple sensors are installed inside the detection box to detect transformer faults. However, during the transportation or installation of the transformer, the internal cooling oil may slosh around. During the sloshing, the oil may splash onto the surface of the sensors, which may have various negative impacts on the performance of the sensors and the measurement results.

[0031] In this technical solution, by setting the L-shaped plate 8 and the vertical plate 14, a serpentine gas channel is formed inside the outer shell connecting pipe 2. The sensor assembly is installed at the top of the end of the gas channel, which greatly reduces the probability of oil splashing onto the sensor surface and thus extends the service life of the sensor.

[0032] The float plate 12 floats on the upper surface of the oil. When the cooling oil level changes, it drives the movable rod 9 and the top plate 10 to move. The detection end of the distance sensor 16 is placed above the top plate 10, and the distance sensor 16 can detect the movement position of the top plate 10. Under normal circumstances, there must be no obstruction between the distance sensor 16 and the liquid surface. Through the above structure, the change in liquid level is converted into a change in the height of the top plate 10. The top plate 10 is placed inside the gas channel, thereby reducing the probability of oil entering the gas channel.

[0033] Example 2

[0034] like Figure 3 As shown in the figure, the transformer fault alarm device proposed in this embodiment, compared with the first embodiment, in this embodiment, the controller 4 is a PLC controller or a microprocessor controller, and a signal transceiver is installed on the protective cover 3. The controller 4 is electrically connected to the temperature sensor 15, the distance sensor 16, the smoke sensor, and the signal transceiver. The temperature sensor 15, the distance sensor 16, and the smoke sensor feed back the detected signals to the controller 4. The controller 4 analyzes and processes the feedback signals and then sends them to the terminal device through the signal transceiver. The operator can directly observe the detection information on the terminal device, realizing the function of remote early warning.

[0035] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A transformer fault alarm device, characterized in that, include: The outer casing connecting pipe (2) is located at the upper end of the transformer casing (1) and is connected to the inside of the transformer casing (1); The upper cover plate (5) is detachably installed on the upper end of the outer shell connecting pipe (2); a first sealing gasket (71) is provided at the bottom end of the upper cover plate (5) along its circumference; Controller (4), which is installed on the outside of the upper cover plate (5); The protective cover (3) is rotatably mounted on the upper end of the transformer housing (1); The L-shaped plate (8) and the vertical plate (14) connected to the lower end of the upper cover plate (5) form a snake-shaped gas channel in the inner cavity of the outer shell connecting pipe (2) through the L-shaped plate (8) and the vertical plate (14); The sensor assembly is installed at the top of the end of the gas channel; The liquid level height auxiliary measuring component includes a movable rod (9) that moves through the bottom end of the L-shaped plate (8) and a top plate (10) and a float plate (12) that are respectively connected to the upper and lower ends of the movable rod (9).

2. The transformer fault alarm device according to claim 1, characterized in that, The sensor assembly includes a temperature sensor (15), a distance sensor (16), and a smoke sensor.

3. The transformer fault alarm device according to claim 2, characterized in that, The controller (4) is a PLC controller or a microprocessor controller. A signal transceiver is installed on the protective cover (3). The controller (4) is electrically connected to the temperature sensor (15), the distance sensor (16), the smoke sensor, and the signal transceiver.

4. The transformer fault alarm device according to claim 1, characterized in that, The bottom end of the upper cover plate (5) is provided with a lower sealing plate (6), and a second sealing gasket (72) is provided around the lower sealing plate (6). The second sealing gasket (72) is in clearance fit with the inner side of the outer shell connecting pipe (2).

5. A transformer fault alarm device according to claim 1, characterized in that, The outer periphery of the L-shaped plate (8) and the outer periphery of the vertical plate (14) are respectively equipped with a third sealing gasket (73) and a fourth sealing gasket (74).

6. A transformer fault alarm device according to claim 1, characterized in that, The L-shaped plate (8) is equipped with a return oil pipe (13), and a one-way valve is installed on the return oil pipe (13).

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