10kV distribution transformer insulating oil condition monitoring sensor device

Abstract

This utility model discloses a 10kV distribution transformer insulating oil condition monitoring sensor device, including a housing body, an upper cover disposed on the upper end of the housing body, and a pressure relief valve disposed on the upper cover. Inside the housing body, a main board and a power circuit board are fixedly mounted via a fixing disc, a first metal stud, and a second metal stud. A mounting cylinder is disposed at the lower part of the housing body, and an oil level detection unit consisting of an infrared emitting plate and an infrared receiving plate is disposed inside the mounting cylinder. This utility model discloses a 10kV distribution transformer insulating oil condition monitoring sensor device, enabling online monitoring of the oil level, oil temperature, oil pressure, temperature above the oil surface, and humidity of oil-immersed power transformers. It can greatly improve the accuracy of judging the condition of the insulating oil in oil-immersed power transformers, avoid misjudgments caused by human factors, and effectively prevent power accidents caused by excessively low oil levels or excessively high oil pressure or temperature in oil-immersed transformers. This is of great significance for improving the safety and stability of the power grid system.

Description

Technical Field

[0001] This utility model relates to the field of power equipment condition monitoring technology, and in particular to a 10kV distribution transformer insulating oil condition monitoring sensing device. Background Technology

[0002] Oil-immersed power transformers are an indispensable and crucial piece of electrical equipment in power systems. Failures in oil-immersed transformers not only disrupt normal power supply for users but also pose a direct threat to the safe operation of the power grid. With economic development and the continuous increase in power grid capacity, the number of oil-immersed transformers used in power systems is growing rapidly. However, due to poor manufacturing quality, unreasonable structural design, and various unpredictable problems encountered during operation, these transformers are facing increasing challenges.

[0003] Oil-immersed power transformers are critical equipment in power distribution networks, and their insulating oil plays a vital role in insulation and heat dissipation. Currently, monitoring the condition of transformer insulating oil mainly relies on periodic manual inspections, judging the oil level by observing the oil level window. This method has significant drawbacks: First, transformers are often installed outdoors at high locations, where dust easily accumulates in the oil level window, making observation difficult; second, manual inspections are inefficient and costly, and cannot achieve real-time monitoring; third, a single oil level indicator cannot comprehensively reflect the overall condition of the insulating oil, and potential faults such as abnormally high oil temperature or changes in internal pressure cannot be detected in time, easily leading to serious power accidents due to problems such as oil leakage, low oil level, or overheating. Therefore, there is an urgent need for a device that can perform multi-parameter, real-time online monitoring of the condition of transformer insulating oil to achieve early fault warning and ensure the safe and stable operation of the power grid.

[0004] Therefore, how to provide a 10kV distribution transformer insulating oil condition monitoring sensor is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] One objective of this invention is to propose a 10kV distribution transformer insulating oil condition monitoring sensor device, which can simultaneously monitor the oil level, oil temperature, oil pressure, and temperature and humidity above the oil surface online, and has an automatic overpressure relief function, so as to solve the problems mentioned in the background art.

[0006] According to an embodiment of the present invention, a 10kV distribution transformer insulating oil condition monitoring sensing device includes a housing body, an upper cover disposed on the upper end of the housing body, and a pressure relief valve disposed on the upper cover; a main board and a power circuit board are fixedly mounted inside the housing body by a fixing disc, a first metal stud, and a second metal stud; an installation cylinder is disposed at the lower part of the housing body, and an oil level detection unit composed of an infrared emitting plate and an infrared receiving plate is disposed inside the installation cylinder, as well as an oil float that can float with the oil level; the oil float is connected to a limiting cylinder by a connecting rod and is axially limited by a snap ring; a protective sleeve is sleeved on the outside of the installation cylinder, and a thermocouple for measuring oil temperature is disposed inside the protective sleeve; a pressure sensor for measuring the air pressure above the oil surface, a temperature sensor for measuring the temperature above the oil surface, and a humidity sensor for measuring the humidity above the oil surface are integrated on the main board.

[0007] As a preferred embodiment of this utility model, the displacement of the oil float can change the infrared signal received by the infrared receiving board, thereby converting it into an oil level value through the signal processing circuit.

[0008] As a further preferred embodiment of this utility model, the pressure relief valve is configured to automatically open when the internal oil pressure of the transformer reaches 35±5Kpa.

[0009] As a further preferred embodiment of this utility model: a communication socket is provided on the main body of the outer shell, which is connected to the motherboard for data transmission with the host computer via an RS485 interface and in accordance with the Modbus protocol.

[0010] As a further preferred embodiment of this utility model: a PC window is embedded in the outer shell body, and the PC window and the outer shell body are sealed by a second sealing ring.

[0011] As a further preferred embodiment of this utility model, the oil float is made of nitrile rubber foam.

[0012] As a further preferred embodiment of this utility model: the power chip of the power circuit board is model SCT2650STER, and its voltage input range is DC 5V to 60V.

[0013] As a further preferred embodiment of this utility model: the top cover and the outer shell body are sealed by a first sealing ring, and the sheath tube and the mounting cylinder are sealed by a third sealing ring.

[0014] The beneficial effects of this utility model are: This utility model discloses a 10kV distribution transformer insulating oil condition monitoring sensor device, which realizes online monitoring of oil level, oil temperature, oil pressure, temperature above the oil surface, and humidity of oil-immersed power transformers. It can greatly improve the accuracy of judging the condition of insulating oil in oil-immersed power transformers, avoid misjudgment caused by human factors, and effectively prevent power accidents caused by excessively low oil level or excessively high oil pressure or temperature in oil-immersed transformers. It is of great significance for improving the safety and stability of power grid system operation. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the 10kV distribution transformer insulating oil condition monitoring sensor proposed in this utility model.

[0016] Figure 2 This is an exploded structural diagram of the 10kV distribution transformer insulating oil condition monitoring sensor proposed in this utility model.

[0017] Figure 3 This is a schematic diagram of the installation structure of the 10kV distribution transformer insulating oil condition monitoring sensor proposed in this utility model.

[0018] The attached diagram shows: 1. Pressure relief valve; 2. Top cover; 3. First sealing ring; 4. Power circuit board; 5. First set of metal studs; 6. Main board; 7. Second set of metal studs; 8. Fixing disc; 9. Mounting cylinder; 10. Infrared emitting plate; 11. Infrared receiving plate; 12. Second sealing ring; 13. PC window; 14. Socket; 15. Outer shell; 16. Third sealing ring; 17. Connecting rod; 18. Snap ring; 19. Sheath tube; 20. Limiting cylinder; 21. Oil float. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0020] refer to Figure 1 , Figure 2 , Figure 3As shown, the system includes a housing body 15, an upper cover 2 disposed on the upper end of the housing body 15, and a pressure relief valve 1 disposed on the upper cover 2. Inside the housing body 15, a main board 6 and a power circuit board 4 are fixedly mounted via a fixing disc 8, a first metal stud 5, and a second metal stud 7. A mounting cylinder 9 is disposed at the lower part of the housing body 15. Inside the mounting cylinder 9, an oil level detection unit consisting of an infrared emitting plate 10 and an infrared receiving plate 11 is disposed, as well as an oil float 21 that can float with the oil level. The oil float 21 is connected to a limiting cylinder 20 via a connecting rod 17 and is axially limited by a snap ring 18. A protective sleeve 19 is sleeved on the outside of the mounting cylinder 9, and a thermocouple for measuring oil temperature is disposed inside the protective sleeve 19. The main board 6 integrates a pressure sensor for measuring the air pressure above the oil surface, a temperature sensor for measuring the temperature above the oil surface, and a humidity sensor for measuring the humidity above the oil surface.

[0021] refer to Figure 1 , Figure 2 , Figure 3 As shown, the displacement of the oil float 21 can change the infrared signal received by the infrared receiver board 11, which is then converted into an oil level value through the signal processing circuit. The pressure relief valve 1 is configured to automatically open and relieve pressure when the internal oil pressure of the transformer reaches 35±5Kpa. A communication socket 14 is provided on the outer casing 15, which is connected to the main board 6 for data transmission with the host computer via an RS485 interface and following the Modbus protocol. A PC window 13 is embedded in the outer casing 15, and the PC window 13 is sealed to the outer casing 15 by a second sealing ring 12. The oil float 21 is made of nitrile rubber foam. The power chip of the power circuit board 4 is model SCT2650STER, and its voltage input range is DC 5V to 60V. The upper cover 2 is sealed to the outer casing 15 by a first sealing ring 3, and the sheath tube 19 is sealed to the mounting cylinder 9 by a third sealing ring 16.

[0022] Working principle: The device is installed on the transformer oil tank. The oil float 21 moves the connecting rod 17 according to the oil level, changing the signal received by the infrared receiver board 11. The signal is processed by the main board 6 to obtain the oil level value. The thermocouple in the sheath tube 19 directly measures the oil temperature. The sensors on the main board 6 collect the pressure, temperature and humidity above the oil surface in real time. All data is uploaded through the RS485 interface. When the internal pressure exceeds the set value, the pressure relief valve 1 automatically opens to ensure safety.

[0023] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

A 1.10kV distribution transformer insulating oil condition monitoring sensor device, characterized in that, The system includes a main body (15), an upper cover (2) located at the upper end of the main body (15), and a pressure relief valve (1) located on the upper cover (2). Inside the main body (15), a main board (6) and a power circuit board (4) are fixedly mounted by a fixing disc (8), a first metal stud (5), and a second metal stud (7). A mounting cylinder (9) is provided at the lower part of the main body (15), and an oil level gauge consisting of an infrared emitting plate (10) and an infrared receiving plate (11) is provided inside the mounting cylinder (9). The detection unit and the oil float (21) that can float with the oil level; the oil float (21) is connected to the limiting cylinder (20) through the connecting rod (17) and is axially limited by the snap ring (18); the outer side of the mounting cylinder (9) is fitted with a protective tube (19), and the inside of the protective tube (19) is equipped with a thermocouple for measuring the oil temperature; the main board (6) integrates a pressure sensor for measuring the air pressure above the oil surface, a temperature sensor for measuring the temperature above the oil surface and a humidity sensor for measuring the humidity above the oil surface.

2. The 10kV distribution transformer insulating oil condition monitoring sensing device according to claim 1, characterized in that, The displacement of the oil float (21) can change the infrared signal received by the infrared receiver (11), which is then converted into an oil level value through the signal processing circuit.

3. The 10kV distribution transformer insulating oil condition monitoring sensing device according to claim 1, characterized in that, The pressure relief valve (1) is configured to automatically open to relieve pressure when the internal oil pressure of the transformer reaches 35±5Kpa.

4. The 10kV distribution transformer insulating oil condition monitoring sensing device according to claim 1, characterized in that, A communication socket (14) is provided on the main body (15). The communication socket (14) is connected to the motherboard (6) and is used to transmit data with the host computer through the RS485 interface and in accordance with the Modbus protocol.

5. The 10kV distribution transformer insulating oil condition monitoring sensing device according to claim 1, characterized in that, A PC window (13) is embedded in the outer shell body (15), and the PC window (13) and the outer shell body (15) are sealed by a second sealing ring (12).

6. The 10kV distribution transformer insulating oil condition monitoring sensing device according to claim 1, characterized in that, The oil float (21) is made of nitrile rubber foam.

7. The 10kV distribution transformer insulating oil condition monitoring sensing device according to claim 1, characterized in that, The power chip of the power circuit board (4) is model SCT2650STER, and its voltage input range is DC 5V to 60V.

8. The 10kV distribution transformer insulating oil condition monitoring sensing device according to claim 1, characterized in that, The top cover (2) is sealed to the outer shell body (15) by a first sealing ring (3), and the sheath tube (19) is sealed to the mounting cylinder (9) by a third sealing ring (16).

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