Online monitoring device for oil temperature, oil level and oil pressure of oil-immersed transformer

Abstract

The utility model belongs to the technical field of transformer monitoring, and particularly relates to an oil temperature, oil level and oil pressure on-line monitoring device for an oil-immersed transformer, which comprises an oil pressure sensor shell. The oil pressure sensor shell comprises a pressure release valve, a monitoring panel assembly, a sleeve, a floating block, a magnetic sheet, an end sleeve, a center rod, a limiting sheet, a temperature sensor, a liquid level sensor and a pressure sensor. The upper end part of the oil pressure sensor shell is provided with an external thread, the lower end part of the pressure release valve is provided with an internal thread, the oil pressure sensor shell and the pressure release valve are connected and closed in a threaded mode, a partition plate is fixed to the inner wall of the upper portion of the oil pressure sensor shell, and the monitoring panel assembly is located above the partition plate; the device solves the problem that an existing oil pressure sensor can only simply monitor oil pressure, cannot relieve pressure and cannot synchronously monitor the temperature and the liquid level, so that the oil pressure sensor is not comprehensively protected.

Description

Technical Field

[0001] The utility model belongs to the technical field of transformer monitoring, and particularly relates to an on-line monitoring device for the oil temperature, oil level and oil pressure of an oil-immersed transformer. Background Technique

[0002] Capacitive equipment in a substation accounts for about 40% - 50% of the total power equipment. Among them, the most critical and most prone to failure capacitive equipment is the oil pressure sensor. The oil pressure sensor is a device that converts a pressure signal into an electrical signal through the piezoresistive effect. The oil pressure sensor is one of the most commonly used sensors in industry. It is widely used in various industrial automatic control environments, involving many industries such as water conservancy and hydropower, engineering machinery, aerospace, transportation, petrochemical industry, machine tools, pipelines, etc. As an important part of hydraulic equipment, the pressure sensor is used for pressure measurement and control. It can accurately measure the pressure to be measured and timely transmit the test results to subsequent displays or controls.

[0003] At present, the oil pressure sensors on the market can only monitor the oil pressure but cannot perform rapid pressure relief. Generally, they are connected to a pressure relief valve through a pipeline, which are two separate entities. This leads to untimely pressure relief. Moreover, during the oil pressure monitoring process, the liquid level and temperature of the oil cannot be monitored synchronously, resulting in incomplete monitoring. The monitored data also requires manual inspection, which is time-consuming and laborious. This phenomenon has become an urgent problem to be solved by those in this field. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an on-line monitoring device for the oil temperature, oil level and oil pressure of an oil-immersed transformer to solve the problems raised in the above background technique.

[0005] To solve the above technical problems, the utility model provides the following technical solution: An on-line monitoring device for the oil temperature, oil level and oil pressure of an oil-immersed transformer, including an oil pressure sensor housing. The oil pressure sensor housing includes a pressure relief valve, a monitoring panel assembly, a bushing, a floating block, a magnetic sheet, an end sleeve, a central rod, a limiting piece, a temperature sensor, a liquid level sensor and a pressure sensor. The oil pressure sensor housing is threadedly connected and closed with the pressure relief valve. The threaded connection is tight, the connection is convenient, and the pressure relief valve is used for automatic pressure relief. The integrated structure has a low cost.

[0006] A partition is fixed on the upper inner wall of the oil pressure sensor housing. The monitoring panel assembly is located above the partition. The temperature sensor, the liquid level sensor and the pressure sensor are all wire-connected to the monitoring panel assembly to realize synchronous monitoring of temperature, liquid level and oil pressure, with comprehensive functions and a comprehensive monitoring range.

[0007] The present utility model is further described as follows. The sleeve is sleeved on the outside of the central rod and is slidably connected. The floating block is sleeved on the outside of the sleeve and is fixedly connected thereto. The magnetic sheet is sleeved on the outside of the sleeve and is fixedly connected thereto, and is located on one side of the end sleeve. The end sleeve is sleeved on the outside of the sleeve and is fixedly connected thereto. The limiting piece is sleeved on the outside of the central rod and is fixedly connected thereto, and is located on the other side of the end sleeve. The central rod is located at the middle position of the oil pressure sensor housing, and its upper end is inserted into the bottom of the pressure relief valve and is fixedly connected thereto. A through hole is provided in the middle of the partition plate, and the sleeve is slidably connected to the through hole. The limiting function of the sleeve is realized through the limiting piece, which is convenient for liquid level monitoring.

[0008] The present utility model is further described as follows. A temperature sensor is provided inside the end sleeve, and the oil temperature is transmitted through the sleeve to realize temperature monitoring. A liquid level sensor is provided on one side of the magnetic sheet, and the magnetic sheet contacts the liquid level sensor as it moves, realizing liquid level monitoring. A pressure sensor is provided at the bottom of the pressure relief valve, and the oil pressure monitoring is stable, and the opening and closing of the pressure relief valve are controlled to realize real-time pressure relief and protect the oil pressure sensor.

[0009] The present utility model is further described as follows. The monitoring panel assembly is used to monitor the temperature, liquid level and oil pressure inside the oil pressure sensor in real time through the temperature sensor, liquid level sensor and oil pressure sensor, and transmit the monitoring information. The inside of the oil pressure sensor housing is filled with oil, with high monitoring accuracy, high efficiency and better monitoring effect.

[0010] Compared with the prior art, the beneficial effects achieved by the present utility model are as follows: The multifunctional oil pressure sensor adopted by the present utility model realizes real-time monitoring of the oil pressure magnitude, temperature and liquid level height, with the largest monitoring range. Compared with other oil pressure sensors, it has a more comprehensive function, a simple overall structure, a low production cost, high monitoring accuracy of the oil pressure magnitude, temperature and liquid level height, and the monitored data is directly transmitted, reducing manual loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model and do not constitute a limitation to the present utility model. In the drawings:

[0012] Figure 1 is the overall structural schematic diagram of the present utility model;

[0013] Figure 2 is the exploded schematic diagram of the pressure relief valve and the oil pressure sensor housing of the present utility model;

[0014] Figure 3 is the planar schematic diagram of the present utility model;

[0015] Figure 4It is an exploded view of the internal structure of the oil pressure sensor housing of the present utility model;

[0016] In the figure: 1. Oil pressure sensor housing; 2. Relief valve; 3. Sleeve; 4. Float; 5. Magnetic sheet; 6. End sleeve; 7. Central rod; 8. Limiting piece. Specific embodiments

[0017] The technical solution of the present utility model will be further described in detail and non - restrictively below in conjunction with the preferred embodiments and their accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0018] Please refer to Figures 1-4 , the present utility model provides a technical solution: an on - line monitoring device for the oil temperature, oil level and oil pressure of an oil - immersed transformer, including an oil pressure sensor housing 1, and the oil pressure sensor housing 1 includes a relief valve 2, a monitoring panel assembly, a sleeve 3, a float 4, a magnetic sheet 5, an end sleeve 6, a central rod 7, a limiting piece 8, a temperature sensor, a liquid level sensor and a pressure sensor;

[0019] The upper part of the oil pressure sensor housing 1 is an external thread, and the lower part of the relief valve 2 is an internal thread. The oil pressure sensor housing 1 and the relief valve 2 are thread - connected and closed. A partition 9 is fixed on the upper inner wall of the oil pressure sensor housing 1, and the monitoring panel assembly is located above the partition 9;

[0020] The sleeve 3 is sleeved outside the central rod 7 and is slidably connected. The float 4 is sleeved outside the sleeve 3 and is fixed to it. The magnetic sheet 5 is sleeved outside the sleeve 3 and is fixed to it, and is located on one side of the end sleeve 6. The end sleeve 6 is sleeved outside the sleeve 3 and is fixed to it.

[0021] The limiting piece 8 is sleeved outside the central rod 7 and is fixed to it, and is located on the other side of the end sleeve 6;

[0022] The central rod 7 is located in the middle of the oil pressure sensor housing 1, and its upper end is inserted into the bottom of the relief valve 2 and is fixed to it. A through - hole is provided in the middle of the partition 9, and the sleeve 3 is slidably connected with the through - hole.

[0023] A temperature sensor is arranged inside the end sleeve 6, a liquid level sensor is arranged on one side of the magnetic sheet 5, and a pressure sensor is arranged at the bottom of the relief valve 2. The temperature sensor, the liquid level sensor and the pressure sensor are all connected to the monitoring panel assembly by wires.

[0024] The monitoring panel assembly is used to monitor the temperature, liquid level and oil pressure inside the oil pressure sensor in real time through the temperature sensor, the liquid level sensor and the oil pressure sensor, and transmit the monitoring information.

[0025] The interior of the oil pressure sensor housing 1 is filled with oil.

[0026] The oil pressure sensor is installed in the transformer of the substation. The oil pressure sensor directly acts on the sensitive element, such as a diaphragm or a strain gauge, through pressure, causing it to generate a micro-displacement or resistance change proportional to the pressure. An electronic circuit is used to detect this micro-displacement or resistance change, and through the monitoring panel assembly, it is converted into an electrical signal and output to a control device or a display device for monitoring or displaying the magnitude of the oil pressure. Moreover, when the oil pressure is relatively high, the pressure relief valve 2 opens to release the internal pressure, playing a role in protecting the oil pressure sensor.

[0027] At the same time, during the oil pressure monitoring process, through the floating block 4, the sleeve 3, the magnetic piece 5, and the end sleeve 6 float on the oil. When the liquid level changes, the sleeve 3 floats through the floating block 4 and slides up and down along the central rod 7, thereby driving the magnetic piece 5 to move up and down. After the magnetic piece 5 comes into contact with the liquid level sensor, the liquid level information is monitored, and through the monitoring panel assembly, it is converted into an electrical signal and output to a control device or a display device for monitoring or displaying the height of the liquid level.

[0028] Also at the same time, during the oil pressure and liquid level monitoring process, the temperature sensor in the end sleeve 6 is transmitted to the central rod 7 and the sleeve 3 through the oil temperature, and then transmitted to the temperature sensor in the end sleeve 6 by the sleeve 3 to monitor the temperature. Through the monitoring panel assembly, it is converted into an electrical signal and output to a control device or a display device for monitoring or displaying the height of the oil temperature.

[0029] Through the above process, the real-time monitoring of the magnitude of the oil pressure, the height of the temperature, and the height of the liquid level is realized, with the maximum range of monitoring. Compared with other oil pressure sensors, the function is more comprehensive, the overall structure is simple, the production cost is low, the monitoring accuracy of the magnitude of the oil pressure, the height of the temperature, and the height of the liquid level is high, and the monitored data is directly transmitted, reducing manual loss.

[0030] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0031] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An online monitoring device for oil temperature, oil level and oil pressure of an oil-immersed transformer, comprising an oil pressure sensor housing (1), characterized in that: The oil pressure sensor housing (1) comprises a pressure relief valve (2), a monitoring panel assembly, a sleeve (3), a float (4), a magnetic sheet (5), an end sleeve (6), a center rod (7), a limit plate (8), a temperature sensor, a liquid level sensor and a pressure sensor; The upper end of the oil pressure sensor housing (1) is divided into an external thread, and the lower end of the pressure relief valve (2) is divided into an internal thread. The oil pressure sensor housing (1) and the pressure relief valve (2) are threadedly connected and closed. A partition (9) is fixed to the upper inner wall of the oil pressure sensor housing (1), and the monitoring panel assembly is located above the partition (9); The sleeve (3) is sleeved on the outside of the center rod (7) and is slidably connected. The floating block (4) is sleeved on the outside of the sleeve (3) and is fixed to each other. The magnetic sheet (5) is sleeved on the outside of the sleeve (3) and is fixed to each other. The magnetic sheet (5) is sleeved on the outside of the sleeve (3) and is fixed to each other. The magnetic sheet (5) is located on one side of the end sleeve (6). The end sleeve (6) is sleeved on the outside of the sleeve (3) and is fixed to each other.

2. The on-line monitoring device for oil temperature, oil level and oil pressure of an oil-immersed transformer according to claim 1 is characterized in that: The limiting piece (8) is sleeved on the outside of the center rod (7), fixed to each other, and located on the other side of the end sleeve (6); The center rod (7) is located in the middle of the oil pressure sensor housing (1), and the upper end is inserted into the bottom of the pressure relief valve (2) and fixed to each other. A through hole is provided in the middle of the partition (9), and the sleeve (3) is slidably connected to the through hole.

3. The on-line monitoring device for oil temperature, oil level and oil pressure of an oil-immersed transformer according to claim 2 is characterized in that: A temperature sensor is arranged inside the end sleeve (6), a liquid level sensor is arranged on one side of the magnetic sheet (5), and a pressure sensor is arranged at the bottom of the pressure relief valve (2). The temperature sensor, the liquid level sensor and the pressure sensor are all connected to the wires of the monitoring panel assembly.

4. The on-line monitoring device for oil temperature, oil level and oil pressure of an oil-immersed transformer according to claim 3 is characterized in that: The monitoring panel assembly is used to monitor the temperature, liquid level and oil pressure in the oil pressure sensor in real time through the temperature sensor, the liquid level sensor and the oil pressure sensor, and transmit the monitoring information.

5. The on-line monitoring device for oil temperature, oil level and oil pressure of an oil-immersed transformer according to claim 4 is characterized in that: The interior of the oil pressure sensor housing (1) is filled with oil.

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