Transformer oil automatic detection device for transformer oil tank

Abstract

The utility model discloses an automatic transformer oil detection device for a transformer oil tank, which is characterized in that an electronic barometer arranged on an exhaust pipe is used for detecting the change of the air pressure in the transformer oil tank, when the numerical value is reduced, the leakage of the transformer oil tank is preliminarily judged, and an exhaust solenoid valve is firstly opened to exhaust gas; closing the exhaust solenoid valve and opening the gas transmission solenoid valve, so that the compressed inert gas in the gas storage tank is re-injected into the transformer oil tank through the gas transmission pipe, the three-way pipe and the connecting pipe to enable the electronic barometer to reach a normal value, detecting the numerical value change of the electronic barometer again after a period of time, and judging that the transformer oil tank leaks if the numerical value change. If not, leakage of the oil tank is eliminated, an oil conveying electromagnetic valve is opened, transformer oil in the oil storage tank is injected into the oil tank through an oil conveying pipe, the liquid level of the oil tank reaches a normal value, then the leakproofness of the oil tank can be judged by detecting the change of the air pressure in the transformer oil tank, and automatic detection of the leakproofness of the transformer oil tank is achieved; the working effect of the transformer is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of transformer oil detection, and in particular to an automatic transformer oil detection device for a transformer oil tank. Background Art

[0002] During normal operation, a transformer's oil tank needs to be filled with an appropriate amount of transformer oil to ensure good insulation, heat dissipation, and arc suppression. These functions are crucial to the transformer's overall performance and safety. Therefore, to ensure the normal operation of the transformer, effective leak testing of the oil tank is necessary to ensure proper sealing and prevent oil leakage from compromising insulation performance, which in turn affects the transformer's reliability and safety. Currently, existing leak detection devices are ineffective in practical applications and cannot automatically detect leaks in the oil tank. Consequently, sealing issues cannot be detected promptly, increasing the risk of transformer failure. Utility Model Content

[0003] In view of the shortcomings of the prior art, the purpose of this application is to provide a transformer oil automatic detection device for a transformer oil tank to solve the problems raised in the above background technology.

[0004] According to one aspect of the present application, a transformer oil automatic detection device for a transformer oil tank is arranged on the top of an oil-immersed transformer, the oil-immersed transformer including a transformer oil tank, an oil storage tank and a gas storage tank are fixedly provided on both sides of the top of the oil-immersed transformer located above the transformer oil tank, the oil storage tank is connected to the interior of the transformer oil tank through an oil pipe, an oil solenoid valve is provided on the oil pipe, the gas storage tank is connected to the interior of the transformer oil tank through an air pipe, a gas solenoid valve is provided on the gas pipe, the gas pipe is also connected to an exhaust pipe, an electronic pressure gauge and an exhaust solenoid valve are provided on the exhaust pipe, an oil filling pipe is also provided on the top of the oil-immersed transformer, and a sealing assembly is provided in the oil filling pipe.

[0005] Preferably, the upper end of the oil delivery pipe is connected to the bottom of the oil storage tank, the lower end of the oil delivery pipe is connected to the top of the transformer oil tank, and the oil delivery solenoid valve is installed at the upper end of the oil delivery pipe.

[0006] Preferably, the upper end of the gas supply pipe is connected to the bottom of the gas storage tank, the lower end of the gas supply pipe is connected to the middle opening of the tee pipe, the lower opening of the tee pipe is connected to the upper end of the connecting pipe, the lower end of the connecting pipe is connected to the top of the transformer oil tank, the upper opening of the tee pipe is connected to the lower end of the exhaust pipe, the upper end opening of the exhaust pipe is set to face upward, the electronic pressure gauge and the exhaust solenoid valve are installed on the exhaust pipe in sequence from bottom to top, and the gas supply solenoid valve is installed at the upper end of the gas supply pipe.

[0007] Preferably, the sealing assembly includes a blocking cover, an adjusting rod and a sealing plug, the blocking cover is fixed to the upper opening of the oil filling pipe by a threaded connection, and a leak-proof plug is fixed on the inner bottom surface of the blocking cover. When the blocking cover is fixed on the oil filling pipe, the leak-proof plug is placed in the oil filling pipe, and the outer wall of the leak-proof plug is interference fit with the inner wall of the oil filling pipe. A boss is fixed on the middle part of the top surface of the blocking cover, and an internal threaded hole is opened through the middle part of the boss. An external thread is provided on the outer peripheral side of the adjusting rod, and the adjusting rod passes through the internal threaded hole and is threadedly connected thereto. An adjusting knob is fixed on the upper end of the adjusting rod, and a sealing plug is fixed on the lower end of the adjusting rod. The outer wall of the sealing plug is in tight sliding contact with the inner wall of the oil filling pipe.

[0008] Preferably, an annular limiting boss is fixedly provided on the inner side wall of the oil filling pipe along its circumference, and the inner diameter of the annular limiting boss is smaller than the outer diameter of the sealing plug.

[0009] Preferably, the upper and lower ends of the annular limiting boss are both provided with an inclination angle.

[0010] Preferably, the upper and lower ends of the sealing plug are both provided with chamfers.

[0011] Preferably, the oil storage tank and the gas storage tank are both fixedly mounted on the top of the oil-immersed transformer through a support frame, and the oil storage tank stores transformer oil, and the gas storage tank stores compressed inert gas. An oil filling port is provided on the top of the oil storage tank, and a gas injection port is provided on the top of the gas storage tank.

[0012] The advantages of the present application over the prior art are as follows: the present application is an automatic transformer oil detection device for a transformer oil tank, which initially injects transformer oil into the transformer oil tank through the oil filling pipe, and injects inert gas into the transformer oil tank through the exhaust pipe, the tee pipe and the connecting pipe. After completion, the oil filling pipe is sealed and blocked by the sealing component, and the exhaust solenoid valve on the exhaust pipe is closed, so that the inner cavity of the transformer oil tank is in a closed state; the change of the air pressure in the transformer oil tank is detected by the electronic pressure gauge provided on the exhaust pipe, and when the pressure value of the electronic pressure gauge is detected to be low, it is preliminarily determined that the transformer oil tank is leaking, and the exhaust solenoid valve is first controlled to open to discharge the gas in the transformer oil tank, and then the exhaust solenoid valve is closed and the gas supply solenoid valve is opened, so that the compressed inert gas in the gas storage tank is discharged through the gas supply solenoid valve. The inert gas is re-injected into the transformer oil tank through the pipe, tee pipe and connecting pipe to make the electronic pressure gauge value reach the normal value and close the gas supply solenoid valve. After waiting for a period of time, the electronic pressure gauge is checked again to observe whether its value changes. If it changes, it is judged that the transformer oil tank is leaking and the maintenance personnel are notified to go to the site for maintenance. If there is no change, the oil tank leakage is eliminated, and the oil supply solenoid valve is controlled to open so that the transformer oil in the oil storage tank is injected into the transformer oil tank through the oil supply pipe to make its liquid level reach the normal value, and the exhaust solenoid valve is opened to exhaust so that the electronic pressure gauge value reaches the normal value. Then, the change of the air pressure in the transformer oil tank can be detected by the automatic detection device to judge the sealing of the oil tank, realize automatic detection of the sealing of the transformer oil tank, and ensure the working effect of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional diagram of a transformer oil automatic detection device for a transformer oil tank according to one embodiment of the present application.

[0014] Figure 2 This is a front view of a transformer oil automatic detection device for a transformer oil tank according to one embodiment of the present application.

[0015] Figure 3 This is a cross-sectional view of a sealing assembly at an oil filling pipe of an automatic transformer oil detection device for a transformer oil tank according to an embodiment of the present application.

[0016] Figure numerals: 1. oil-immersed transformer; 2. transformer oil tank; 3. oil storage tank; 4. gas storage tank; 5. oil pipeline; 6. oil solenoid valve; 7. gas pipeline; 8. gas solenoid valve; 9. exhaust pipe; 10. electronic pressure gauge; 11. exhaust solenoid valve; 12. oil filling pipe; 13. sealing assembly; 131. plugging cover; 132. adjusting rod; 133. sealing plug; 134. anti-leakage plug; 135. boss; 136. adjusting knob; 137. annular limit boss; 14. tee pipe; 15. connecting pipe. DETAILED DESCRIPTION

[0017] In order to make the content of this application easier to understand, the technical solutions in the embodiments of this application will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of this application. It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the attached drawings. Figure 2 As used herein, the terms "inward" and "outward" refer to directions toward and away from, respectively, the geometric center of the particular component.

[0018] like Figures 1 to 3 As shown, a transformer oil automatic detection device for a transformer oil tank is arranged on the top of an oil-immersed transformer 1. The oil-immersed transformer 1 includes a transformer oil tank 2. An oil filling pipe 12 is also provided on the top of the oil-immersed transformer 1. A sealing assembly 13 is provided in the oil filling pipe 12. An oil storage tank 3 and an air storage tank 4 are fixed on both sides of the top of the oil-immersed transformer 1 above the transformer oil tank 2. The upper end of the oil delivery pipe 5 is connected to the bottom of the oil storage tank 3, and the lower end of the oil delivery pipe 5 is connected to the top of the transformer oil tank 2. An oil delivery solenoid valve 6 is installed at the upper end of the oil delivery pipe 5. The upper end of the air delivery pipe 7 is connected to the bottom of the air storage tank 4, and the lower end of the air delivery pipe 7 is connected to the middle opening of the tee pipe 14. The lower opening of the tee pipe 14 is connected to the bottom of the transformer oil tank 2. The mouth is connected to the upper end of the connecting pipe 15, the lower end of the connecting pipe 15 is connected to the top of the transformer oil tank 2, the upper opening of the tee pipe 14 is connected to the lower end of the exhaust pipe 9, the upper end opening of the exhaust pipe 9 is set upward, and the exhaust pipe 9 is sequentially installed with an electronic pressure gauge 10 and an exhaust solenoid valve 11 from bottom to top. The gas solenoid valve 8 is installed at the upper end of the gas pipe 7. In addition, the oil storage tank 3 and the gas storage tank 4 are fixedly mounted on the top of the oil-immersed transformer 1 through a support frame, and transformer oil is stored in the oil storage tank 3, and compressed inert gas is stored in the gas storage tank 4. An oil filling port is provided on the top of the oil storage tank 3, and a gas injection port is provided on the top of the gas storage tank 4 to facilitate the replenishment of transformer oil and compressed inert gas into the oil storage tank 3 and the gas tank 4.

[0019] Specifically, the sealing assembly 13 includes a plug cover 131, an adjusting rod 132 and a sealing plug 133. The plug cover 131 is fixed to the upper end opening of the oil filling pipe 12 by a threaded connection, and a leak-proof plug 134 is fixed to the inner bottom surface of the plug cover 131. When the plug cover is fixed on the oil filling pipe 12, the leak-proof plug 134 is placed in the oil filling pipe 12, and the outer wall of the leak-proof plug 134 is connected with the inner wall of the oil filling pipe 12 by an interference fit, which can improve the sealing of the upper end opening of the oil filling pipe 12; a boss 135 is fixed to the middle part of the top surface of the plug cover 131, and an internal threaded hole is opened through the middle part of the boss 135. An external thread is set on the outer peripheral side of the adjusting rod 132, and the adjusting rod 132 passes through the internal threaded hole and is threadedly connected thereto. An adjusting knob 136 is fixed to the upper end of the adjusting rod 132. A sealing plug 133 is fixedly provided at the lower end of 132, and the outer wall of the sealing plug 133 is in tight sliding contact with the inner wall of the oil filling tube 12. An annular limiting boss 137 is fixedly provided on the inner wall of the oil filling tube 12 along its circumference. The inner diameter of the annular limiting boss 137 is smaller than the outer diameter of the sealing plug 133. The sealing plug 133 can drive the adjusting rod 132 to rotate by rotating the adjusting knob 136, thereby moving it downward along the inner wall of the oil filling tube 12 to the lower end position of the annular limiting boss 137 to improve the sealing performance of the opening at the lower end of the oil filling tube 12; in addition, the upper and lower ends of the annular limiting boss 137 are both provided with an inclination angle, and the upper and lower ends of the sealing plug 133 are both provided with chamfers to facilitate the sealing plug 133 to slide through the annular limiting boss 137 to its lower end position.

[0020] Working principle: Initially, transformer oil is injected into the transformer tank 2 through the oil filling pipe 12, and inert gas is injected into the transformer tank 2 through the exhaust pipe 9, the tee pipe 14 and the connecting pipe 15. After completion, the oil filling pipe 12 is sealed and blocked by the sealing component 13, and the exhaust solenoid valve 11 on the exhaust pipe 9 is closed, so that the inner cavity of the transformer tank 2 is in a closed state; the change of the air pressure in the transformer tank 2 is detected by the electronic pressure gauge 10 provided on the exhaust pipe 9. When the pressure value of the electronic pressure gauge 10 is detected to be low, it is preliminarily judged that the transformer tank 2 has leaked. The exhaust solenoid valve 11 is first controlled to open to discharge the gas in the transformer tank 2, and then the exhaust solenoid valve 11 is closed and the gas supply solenoid valve 8 is opened, so that the compressed inert gas in the gas storage tank 4 passes through the gas supply pipe 7, the tee pipe 14 and the connecting pipe 1 5. Inert gas is re-injected into the transformer oil tank 2 so that the value of the electronic pressure gauge 10 reaches the normal value and the gas supply solenoid valve 8 is closed. After waiting for a period of time, the electronic pressure gauge 10 is checked again to see if its value changes. If it changes, it is determined that the transformer oil tank 2 is leaking and the maintenance personnel are notified to go to the site for maintenance. If it does not change, the oil tank leakage is eliminated, and the oil supply solenoid valve 6 is controlled to open so that the transformer oil in the oil storage tank 3 is injected into the transformer oil tank 2 through the oil supply pipe 5 so that its liquid level reaches the normal value. The exhaust solenoid valve 11 is opened to exhaust so that the value of the electronic pressure gauge 10 reaches the normal value. Then, the automatic detection device can detect the change of the air pressure in the transformer oil tank 2 to determine the sealing of the oil tank, realize automatic detection of the sealing of the transformer oil tank 2, and ensure the working effect of the transformer.

[0021] The above embodiments are intended only to illustrate the technical solutions of the embodiments of the present application and are not intended to limit them. Although the embodiments of the present application have been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that, without departing from the spirit and scope defined by the claims of the present application, they may still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents.

Claims

1. A transformer oil automatic detection device for a transformer oil tank, arranged on the top of an oil-immersed transformer (1), wherein the oil-immersed transformer (1) includes a transformer oil tank (2), characterized in that: An oil storage tank (3) and a gas storage tank (4) are fixedly provided on both sides of the top of the oil-immersed transformer (1) above the transformer oil tank (2), respectively. The oil storage tank (3) is connected to the interior of the transformer oil tank (2) through an oil delivery pipe (5), and an oil delivery solenoid valve (6) is provided on the oil delivery pipe (5). The gas storage tank (4) is connected to the interior of the transformer oil tank (2) through an air delivery pipe (7), and an air delivery solenoid valve (8) is provided on the air delivery pipe (7). The air delivery pipe (7) is also connected to an exhaust pipe (9), and an electronic pressure gauge (10) and an exhaust solenoid valve (11) are provided on the exhaust pipe (9). An oil filling pipe (12) is also provided on the top of the oil-immersed transformer (1), and a sealing component (13) is provided in the oil filling pipe (12).

2. The automatic transformer oil detection device for a transformer oil tank according to claim 1, characterized in that: The upper end of the oil delivery pipe (5) is connected to the bottom of the oil storage tank (3), the lower end of the oil delivery pipe (5) is connected to the top of the transformer oil tank (2), and the oil delivery solenoid valve (6) is installed at the upper end of the oil delivery pipe (5).

3. The automatic transformer oil detection device for a transformer oil tank according to claim 1, characterized in that: The upper end of the gas supply pipe (7) is connected to the bottom of the gas storage tank (4), the lower end of the gas supply pipe (7) is connected to the middle opening of the three-way pipe (14), the lower opening of the three-way pipe (14) is connected to the upper end of the connecting pipe (15), the lower end of the connecting pipe (15) is connected to the top of the transformer oil tank (2), the upper opening of the three-way pipe (14) is connected to the lower end of the exhaust pipe (9), the upper opening of the exhaust pipe (9) is arranged to face upward, and the electronic pressure gauge (10) and the exhaust solenoid valve (11) are installed on the exhaust pipe (9) in sequence from bottom to top, and the gas supply solenoid valve (8) is installed at the upper end of the gas supply pipe (7).

4. The automatic transformer oil detection device for a transformer oil tank according to claim 1, characterized in that: The sealing assembly (13) includes a plug cover (131), an adjusting rod (132) and a sealing plug (133). The plug cover (131) is fixed to the upper end opening of the oil filling pipe (12) through a threaded connection. An anti-leakage plug (134) is fixed to the inner bottom surface of the plug cover (131). When the plug cover (131) is fixed to the oil filling pipe (12), the anti-leakage plug (134) is inserted into the oil filling pipe (12), and the outer wall of the anti-leakage plug (134) is connected to the inner wall of the oil filling pipe (12) by interference fit. A boss (135) is fixedly provided in the middle of the top surface of the blocking cover (131), an internal threaded hole is penetrated through the middle of the boss (135), an external thread is provided on the outer peripheral side of the adjusting rod (132), the adjusting rod (132) penetrates the internal threaded hole and is threadedly connected thereto, an adjusting knob (136) is fixedly provided at the upper end of the adjusting rod (132), a sealing plug (133) is fixedly provided at the lower end of the adjusting rod (132), and the outer wall of the sealing plug (133) is tightly slidably contacted with the inner wall of the oil filling pipe (12).

5. The automatic transformer oil detection device for a transformer oil tank according to claim 4, characterized in that: An annular limiting boss (137) is fixedly provided on the inner side wall of the oil filling pipe (12) along its circumference, and the inner diameter of the annular limiting boss (137) is smaller than the outer diameter of the sealing plug (133).

6. The automatic transformer oil detection device for a transformer oil tank according to claim 5, characterized in that: The upper and lower ends of the annular limiting boss (137) are both provided with an inclination angle.

7. The automatic transformer oil detection device for a transformer oil tank according to claim 6, characterized in that: The upper and lower ends of the sealing plug (133) are both provided with chamfers.

8. The transformer oil automatic detection device for a transformer oil tank according to claim 1, characterized in that: The oil storage tank (3) and the gas storage tank (4) are both fixedly mounted on the top of the oil-immersed transformer (1) via a support frame, and the oil storage tank (3) stores transformer oil, and the gas storage tank (4) stores compressed inert gas. The top of the oil storage tank (3) is provided with an oil filling port, and the top of the gas storage tank (4) is provided with a gas injection port.

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