Intelligent oil pressure testing device for transformer oil conservator

Abstract

The application discloses a kind of transformer oil conservator intelligent oil pressure test device, including test cabinet, the upper part of the pressure charging device is connected with pressure reducing valve assembly, one side of the pressure reducing valve assembly is connected with electromagnetic valve, one side of the electromagnetic valve is provided with transition tank, one side of the transition tank is connected with inflation pipeline, the inflation pipeline is connected with breathing pipe, exhaust pipe by tee, the middle part of the breathing pipe, exhaust pipe is respectively provided with tee valve one, tee valve two, the upper part of the transition tank is provided with pressure sensor, pressure relief valve, the module box is connected with electromagnetic valve.The application is connected with tee valve one and tee valve two by setting, to control the communication and disconnection of breathing pipe, exhaust pipe, carry out inflation and deflation adjustment pressure in oil conservator, set sensor to monitor, control pressure in transition tank, and carry out control to electromagnetic valve by module box, realize the undismounted verification of compensating element in oil conservator, reduce workload, simultaneously realize convenient to carry out a variety of different tests.

Description

Technical Field

[0001] This invention relates to the field of oil tank testing technology, and in particular to an intelligent oil pressure testing device for transformer oil tanks. Background Technology

[0002] Currently, the following types of oil storage tanks are used domestically and internationally: open-type oil storage tanks with semiconductor refrigeration dryers, capsule-type oil storage tanks, diaphragm-type oil storage tanks, and corrugated metal oil storage tanks. Corrugated metal oil storage tanks are further divided into internal oil type and external oil type.

[0003] In an externally oiled corrugated metal conservator, the transformer oil is located between the outside of the corrugated pipe and the conservator. The inner cavity of the corrugated pipe is exposed to air via a silica gel desiccant. Externally oiled corrugated metal conservators are durable, easy to maintain, and leaks in the corrugated pipe do not affect the transformer's energized operation. Their installation position is higher than the transformer bushing, allowing for the detection of bushing sealing defects.

[0004] External oil-filled corrugated oil conservators are crucial components for compensating for the insulating oil volume and providing isolation and sealing in oil-immersed transformers. Leakage or severe jamming in the corrugated core can affect the safe operation of the transformer. Currently, conducting simulated corrugation operation tests and sealing tests on external oil-filled oil conservators in operation typically requires disassembling the compensation components for verification. Equipment used for simultaneous testing often struggles to perform two or more tests, and personnel must continuously monitor and control the charging pressure, making the operation cumbersome and labor-intensive. Furthermore, misoperation can damage the oil conservator. Summary of the Invention

[0005] The present invention aims to overcome the shortcomings of the existing technology by providing an intelligent hydraulic testing device for transformer oil conservators. This invention achieves the advantages of convenient transportation, calibration without disassembly, reduced workload, avoidance of errors, and compatibility with various testing conditions.

[0006] The technical solution adopted by this invention to solve its technical problem is:

[0007] An intelligent oil pressure testing device for a transformer oil conservator includes a test cabinet. The test cabinet contains a pressurization assembly, which includes a pressurization device. A pressure reducing valve assembly is connected to the upper part of the pressurization device. A solenoid valve is connected to one side of the pressure reducing valve assembly. A transition tank is located on one side of the solenoid valve. An air filling pipeline is connected to one side of the transition tank. The air filling pipeline is connected to a breathing pipe and an exhaust pipe via a tee. A three-way valve (first and second) is respectively installed in the middle of the breathing pipe and the exhaust pipe. The inlets of the three-way valves are connected to the ends of the breathing pipe and the exhaust pipe closest to the tee, respectively. The three-way valves are open to the atmosphere. A breather port and an exhaust port are respectively installed at one end of the breathing pipe and the exhaust pipe. A pressure sensor and a pressure relief valve are installed on the upper part of the transition tank. The pressure sensor is connected to a module box, which is connected to a switch. The module box is connected to the solenoid valve. A power supply is located outside the test cabinet and is connected to the switch.

[0008] As a preferred embodiment of the present invention, the pressure reducing valve assembly is a three-part assembly, including a pressure reducing valve, an oil-water separator, and an air filter.

[0009] As a preferred embodiment of the present invention, the switch is provided with a system on / off knob and an inflation start / stop button on one side.

[0010] As a preferred embodiment of the present invention, the pressure sensor is a digital display pressure switch.

[0011] As a preferred embodiment of the present invention, the power source is supplied with 220V AC power.

[0012] As a preferred embodiment of the present invention, a handle is provided on one side of the test cabinet.

[0013] As a preferred embodiment of the present invention, the upper part of the test cabinet is provided with lifting lugs.

[0014] As a preferred embodiment of the present invention, the lower part of the test cabinet is provided with casters, and four sets of casters are provided. The two sets of casters near the handle are provided with brake components.

[0015] The beneficial effects of this invention are:

[0016] 1. This invention connects the breathing pipe and exhaust pipe to the oil tank, and uses three-way valves one and two to control the connection and disconnection of the breathing pipe and exhaust pipe, connecting to the transition tank for filling and releasing gas to regulate the pressure inside the oil tank. Sensors are set up to monitor and control the pressure inside the transition tank, and the solenoid valve is controlled through a module box. This enables the verification of the compensation components inside the oil tank without disassembly, reducing workload, and facilitating various tests, such as the sealing test of the oil tank body, leak detection of the oil tank compensation components, and filling and releasing gas test of the external oil horizontal oil tank.

[0017] 2. This invention separates oil and water, filters compressed air, and automatically drains water through a water-oil separator with a pressure reducing valve. Knobs and buttons control the overall system and the charging / discharging functions, facilitating various tests. A digital pressure switch allows for easy monitoring of the pressure in the transition tank. A module box controls a solenoid valve, closing at high pressure and opening at low pressure for automatic pressurization, monitoring, and control, achieving fully automated operation. This reduces testing risks and manual labor, decreases workload, and avoids errors. It changes the traditional manual operation mode of transformer static oil pressure testing, enabling real-time processing and reducing drawbacks such as slow response, misoperation, and heavy workload. This also reduces the workload of operators and lowers the possibility of equipment accidents.

[0018] 3. The present invention facilitates the pushing, transporting, loading and unloading of the test cabinet by setting handles, lifting lugs and casters, and at the same time, a brake assembly is set on the rear wheels to prevent the test cabinet from moving during the test. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0020] In the diagram: 1. Test cabinet; 2. Pressurization assembly; 21. Pressurization device; 22. Pressure reducing valve assembly; 23. Solenoid valve; 24. Transition tank; 241. Pressure sensor; 242. Pressure relief valve; 25. Inflation pipeline; 251. T-connector; 252. Breathing pipeline; 2521. Three-way valve one; 2522. Breathing port interface; 253. Exhaust pipe; 2531. Three-way valve two; 2532. Exhaust port interface; 3. Power supply; 4. Switch; 5. Lifting lug; 6. Handle; 7. Casters. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments.

[0022] like Figure 1 As shown, the present invention provides the following technical solution:

[0023] A smart oil pressure testing device for a transformer oil conservator includes a test cabinet 1. The test cabinet 1 contains a pressurization assembly 2, which includes a pressurization device 21. A pressure reducing valve assembly 22 is connected to the upper part of the pressurization device 21. A solenoid valve 23 is connected to one side of the pressure reducing valve assembly 22. A transition tank 24 is located on one side of the solenoid valve 23. An air filling pipeline 25 is connected to one side of the transition tank 24. The air filling pipeline 25 is connected to a breathing pipe 252 and an exhaust pipe 253 via a three-way valve 251. A three-way valve 1 2521 and a three-way valve 2531 are respectively installed in the middle of the breathing pipe 252 and the exhaust pipe 253. The inlets of valve 2521 and three-way valve 2531 are connected to the breathing pipe 252 and the exhaust pipe 253 respectively, near the end of the three-way valve 251. The three-way valve 251 and three-way valve 2531 are connected to the atmosphere. One end of the breathing pipe 252 and the exhaust pipe 253 is provided with a breathing port interface 2522 and an exhaust port interface 2532 respectively. The upper part of the transition tank 24 is provided with a pressure sensor 241 and a pressure relief valve 242. The pressure sensor 241 is connected to a module box. The module box is connected to a switch 4. The module box is connected to a solenoid valve 23. A power supply 3 is provided outside the test cabinet 1. The power supply 3 is connected to the switch 4. The breathing pipe 252 and exhaust pipe 253 are connected to the oil storage tank. The connection and disconnection of the breathing pipe 252 and exhaust pipe 253 are controlled by three-way valve 1 2521 and three-way valve 2531. The transition tank 24 is connected to regulate the pressure inside the oil storage tank by filling and releasing gas. The pressure inside the transition tank 24 is monitored and controlled by a sensor. The solenoid valve 23 is controlled by the module box.

[0024] In this embodiment, the pressure reducing valve assembly 22 is a three-part unit, including a pressure reducing valve, an oil-water separator, and an air filter. The oil-water separator filters and the pressure reducing valve to separate oil and water, filters compressed air, and automatically drains water.

[0025] In this embodiment, a system on / off knob and an inflation start / stop button are provided on one side of switch 4. The knob and button control the overall system and the inflation / deflation functions respectively, facilitating different tests.

[0026] In this embodiment, the pressure sensor 241 is a digital display pressure switch. This facilitates observation of the air pressure in the transition tank 24 and also allows for control of the solenoid valve 23 via the module box, closing when the pressure is high and opening when the pressure is low.

[0027] In this embodiment, power supply 3 is supplied with 220V AC power. This device is compatible with 220V AC power, expanding the application scenarios of the equipment.

[0028] In this embodiment, a handle 6 is provided on one side of the test cabinet 1. The handle 6 facilitates pushing and moving the test cabinet 1.

[0029] In this embodiment, the upper part of the test cabinet 1 is provided with lifting lugs 5. The lifting lugs 5 facilitate the loading, unloading, and movement of the test cabinet 1.

[0030] In this embodiment, the lower part of the test cabinet 1 is provided with casters 7, and four sets of casters 7 are provided. The two sets of casters 7 near the handle 6 are equipped with brake components. The casters 7 facilitate the movement of the test cabinet 1, and the brake components on the rear wheels prevent the test cabinet 1 from moving during the test.

[0031] Working principle of the invention:

[0032] Gas filling and discharging test: Before the test, drain the transformer oil in the oil conservator to below the gas relay level, and close the oil filling port and valve of the oil conservator. Seal the breather port 2522 to the breather pipe of the oil conservator, and seal the exhaust port 2532 to the exhaust pipe 253 of the oil conservator. Adjust the three-way valves: three-way valve one 2521 seals the inlet and outlet to the atmosphere, and three-way valve two 2531 connects to the exhaust pipe 253 and seals the atmosphere. Connect the power supply 3, rotate the knob to start the system, and set the outlet pressure of the pressure reducing valve to 0.5MPa. The pressurizing device 21 starts pressurizing, the pressure sensor 241 is energized and opens, the gas filling button is pressed, the solenoid valve 23 opens, and high-pressure dry air enters the oil chamber of the oil conservator. The corrugated core in the oil conservator starts to move towards the 10 oil level. When the pressure in the transition tank 24 reaches 30KPa, the pressure sensor 241 outputs a high-pressure shut-off feedback signal, the solenoid valve 23 is de-energized and closed, and when the pressure in the transition tank 24 is below 20KPa, the solenoid valve 23 is opened to continue gas filling. When the pressure inside the transition tank 24 reaches 35 kPa, the pressure is released through the pressure relief valve, and the inflation button is pressed to stop inflation. At this time, the solenoid valve 23 is de-energized and closed, and is no longer controlled by the pressure sensor 241. The rotary three-way valve 2531 closes the inlet, and the outlet is connected to the atmosphere. The oil chamber of the oil tank is depressurized, and the corrugated core begins to move towards the 0 oil level. After the oil level gauge stops moving, the rotary three-way valve 2521 connects to the breather pipe, closes the atmosphere, and the inflation button is pressed to inflate the breather chamber. The oil level gauge of the oil tank continues to move towards the 0 oil level.

[0033] Sealing Test: Before the test, close the oil inlet and oil outlet valves of the oil tank and ensure a reliable seal. Keep the vent open. Seal the exhaust port interface 2532 to the oil tank exhaust pipe 253. Seal the inlet of three-way valve one 2521 and seal the atmosphere with three-way valve two 2531. Turn the system knob to start the system and pressurize. The pressure sensor 241 will be energized and open. Press the button to start inflation. The solenoid valve 23 will be energized and open. High-pressure dry air will enter the oil chamber of the oil tank until the corrugated core in the oil tank reaches the 10 oil level and the pressure in the transition tank 24 reaches 30 kPa. The pressure sensor 241 will output a high-pressure shut-off feedback signal, and the solenoid valve 23 will be de-energized and closed. When the pressure in the transition tank 24 is lower than 20 kPa, the pressure sensor 241 will output a low-pressure open feedback signal, energizing the solenoid valve 23 to continue inflating the oil tank until the pressure stabilizes. Record the stable pressure value. Maintain the pressure for 2 hours and observe the pressure changes to determine if there is any leakage in the oil tank.

[0034] In the description of this utility model, the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for describing this utility model and do not require that this utility model be constructed or operated in a specific orientation, and therefore should not be construed as limiting this utility model. The terms "connected" and "linked" in this utility model should be interpreted broadly. For example, they can refer to a connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0035] The above description represents the preferred embodiments of this utility model. The specific embodiments are provided only for a better understanding of the concept of this utility model. For those skilled in the art, several improvements or equivalent substitutions can be made based on the principles of this utility model, and these improvements or equivalent substitutions are also considered to fall within the protection scope of this utility model.

Claims

1. A transformer oil conservator intelligent oil pressure test method using a transformer oil conservator intelligent oil pressure test device, the transformer oil conservator intelligent oil pressure test device comprising a test cabinet (1), the inside of the test cabinet (1) being provided with a pressure charging assembly (2), the pressure charging assembly (2) comprising a pressure charging device (21), the upper part of the pressure charging device (21) being connected with a pressure reducing valve assembly (22), one side of the pressure reducing valve assembly (22) being connected with a solenoid valve (23), one side of the solenoid valve (23) being provided with a transition tank (24), one side of the transition tank (24) being connected with an air charging pipeline (25), the air charging pipeline (25) being connected with a breathing pipeline (252) and an exhaust pipe (253) through a tee joint (251), the middle parts of the breathing pipeline (252) and the exhaust pipe (253) being respectively provided with a tee valve one (2521) and a tee valve two (2531), the inlets of the tee valve one (2521) and the tee valve two (2531) being respectively connected with the breathing pipeline (252) and the exhaust pipe (253) near one end of the tee joint (251), the tee valve one (2521) and the tee valve two (2531) being communicated with the atmosphere, one end of the breathing pipeline (252) and the exhaust pipe (253) being respectively provided with a breathing port interface (2522) and an exhaust port interface (2532), the upper part of the transition tank (24) being provided with a pressure sensor (241) and a pressure relief valve (242), the pressure sensor (241) being connected with a module box, the module box being connected with a switch (4), the module box being connected with the solenoid valve (23), the outside of the test cabinet (1) being provided with a power supply (3), the power supply (3) being connected with the switch (4); the pressure reducing valve assembly (22) is a three-in-one piece, comprising a pressure reducing valve, an oil-water separator and an air filter; one side of the switch (4) is provided with a system on-off knob and an air charging start-stop button; the test method comprises: air charging and discharging test: before the test, the transformer oil in the oil conservator is discharged to below the gas relay, the oil inlet and the oil valve of the oil conservator are closed, the inlet of the tee valve one (2521) is sealed, the outlet is connected with the atmosphere, the tee valve two (2531) is connected with the exhaust pipe (253) and sealed with the atmosphere, the power supply (3) is turned on, the pressure charging device (21) starts to pressurize, the corrugated core in the oil conservator starts to run to the 10 oil level, the tee valve two (2531) is rotated to close the inlet, the outlet is communicated with the atmosphere, the oil cavity of the oil conservator is depressurized, the corrugated core starts to run to the 0 oil level, after the oil level gauge stops moving, the tee valve one (2521) is rotated to connect the breathing pipeline, the atmosphere is sealed, the air charging button is pressed, the breathing cavity is charged with air, and the oil level gauge continues to run to the 0 oil level. Sealing test: before the test, close the oil tank filling port and the filling port valve and seal reliably, keep the breathing port open, connect the exhaust port interface (2532) with the oil tank exhaust pipe (253), seal the inlet of three-way valve one (2521), seal the atmosphere of three-way valve two (2531), rotate the system knob to start the system pressurization, high-pressure dry air enters the oil cavity of the oil tank, until the corrugated core in the oil tank reaches 10 oil level, pressure maintaining for 2 hours, observe the pressure change, judge whether the oil tank exists leakage.

2. The intelligent oil pressure test method for a transformer oil conservator according to claim 1, characterized in that, The pressure sensor (241) is a digital pressure switch.

3. The intelligent oil pressure test method for a transformer oil conservator according to claim 1, characterized in that, The power supply (3) is connected with 220V alternating current.

4. The intelligent oil pressure test method for a transformer oil conservator according to claim 1, characterized in that, One side of the test cabinet (1) is provided with a handle (6).

5. The intelligent oil pressure test method for a transformer oil conservator according to claim 1, characterized in that, The upper part of the test cabinet (1) is provided with a lifting lug (5).

6. The transformer tank conservator intelligent pressure test method according to claim 4, characterized in that, The lower part of the test cabinet (1) is provided with universal wheels (7), and the universal wheels (7) are provided with four groups, and the two groups of universal wheels (7) close to the handle (6) are provided with brake assemblies.

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