An internal air pressure regulating device for an oil-immersed transformer and a control method thereof

Abstract

The present invention discloses an internal air pressure regulating device for an oil-immersed transformer and a control method thereof, and relates to the technical field of transformer operation control. In the present invention: a vibration box is inserted with a bracket body, an injection cavity is formed between the side plate of the vibration box and the vertical plate, and a plurality of vibration metal sheets are movably inserted into the two vertical plates and the vibration frame. The vertical plates and the vibration frame are provided with flow grooves located between adjacent vibration metal sheets, and the vibration metal sheets are vertically provided with flow holes located in the vibration cavity area. An electromagnetic mechanism is arranged on the top of the vibration box. A return pipe is installed between the oil-immersed bottom of the transformer and the injection cavity of the vibration box. An air pipe is connected to the top of the vibration box, and the air pipe is connected to a gas device arranged outside the transformer. The present invention can effectively discharge mixed gas components in the oil body, reduce bubbles mixed in the transformer oil body, thereby improving the insulation strength of the transformer and ensuring the safe operation of the transformer; the present invention also prevents impurities such as air and moisture from entering the interior of the transformer due to abnormal air pressure.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer operation control, and in particular to an internal air pressure regulating device for an oil-immersed transformer and a control method thereof. Background Art

[0002] During transformer operation, the insulating oil can dissolve gases such as air and hydrogen due to various factors. When the oil temperature and pressure fluctuate, these gases can precipitate from the oil to form bubbles. These bubbles are weak points in the insulation and are prone to partial discharge in high electric fields, reducing insulation strength and potentially causing insulation breakdown, threatening the safe operation of the transformer.

[0003] However, when the oil temperature drops, the oil volume shrinks and the oil level drops. Gas needs to be added to the oil conservator to maintain normal air pressure, prevent negative pressure from forming inside the transformer, and prevent impurities such as air and moisture from entering the transformer.

[0004] In summary, how to efficiently and timely regulate the gas pressure inside the transformer to ensure the gas pressure and operational stability of the transformer has become a problem that needs to be solved during the safe and stable operation of the transformer. Summary of the Invention

[0005] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The present invention provides an internal gas pressure regulating device for an oil-immersed transformer. The device comprises a vibrating box mounted on top of the transformer, a bracket body being inserted into the vibrating box, and a bottom plate of the bracket body having an outlet for connecting the inner cavity of the vibrating box with the inner cavity of the transformer. The bracket body comprises two vertical plates inserted into the vibrating box, and a vibrating frame is movably mounted between the two vertical plates.

[0007] An injection cavity is formed between the side plates and the vertical plates of the vibration box. Multiple vibrating metal sheets are movably inserted into the two vertical plates and the vibration frame. The side ends of the vibrating metal sheets are inserted into the injection cavity and are provided with edge notches. A vibration cavity is formed between the two vertical plates of the vibration box. The vertical plates and the vibration frame are provided with flow grooves located between adjacent vibrating metal sheets. The vibrating metal sheets are provided with vertical flow holes located in the vibration cavity area. An electromagnetic mechanism is configured at the top of the vibration box. The electromagnetic mechanism has an electromagnet built in. A magnet part that cooperates with the electromagnet is configured at the top of the vibration frame. A return pipe is installed between the oil-immersed bottom of the transformer and the injection cavity of the vibration box. The return pipe is provided with an oil pump. An air pipe is connected to the top of the vibration box, and the air pipe is connected to a gas device configured outside the transformer.

[0008] As a preferred technical solution of the device of the present invention: the vertical plate and the vibration frame are provided with slots for horizontally inserting the vibration metal sheets.

[0009] As a preferred technical solution of the device of the present invention: the diameter of the flow hole of the vibrating metal sheet at the upper side is larger than the diameter of the flow hole of the vibrating metal sheet at the lower side.

[0010] As a preferred technical solution of the device of the present invention, an upper rod is disposed on the upper side of the vibration frame and a lower rod is disposed on the lower side, wherein the magnet portion is located at the top of the upper rod. An upper guide structure is provided on the top plate of the vibration box, an upper sliding sleeve is disposed at the position of the upper guide structure, and the upper rod is assembled within the inner periphery of the upper sliding sleeve. A lower guide structure is provided on the bottom plate of the bracket body, a lower sliding sleeve is disposed at the position of the lower guide structure, and the lower rod is assembled within the inner periphery of the lower sliding sleeve.

[0011] As a preferred technical solution of the device of the present invention, a magnetic attraction gap exists between the magnet portion and the electromagnet, and the size of the magnetic attraction gap is smaller than the maximum deformation displacement size of the vibrating metal sheet in the vertical direction.

[0012] As a preferred technical solution of the device of the present invention: the gas pipe between the vibration box and the gas device is provided with an electron tube valve.

[0013] As a preferred technical solution of the device of the present invention: the transformer body is independently equipped with a temperature sensor and an air pressure sensor.

[0014] The present invention provides a control method for an internal air pressure regulating device of an oil-immersed transformer, the contents of which are as follows:

[0015] (1) During the transformer load operation, when the transformer oil temperature exceeds the standard or the gas pressure exceeds the standard:

[0016] ①The gas device is started to absorb the excess gas.

[0017] ② The oil pump starts and continuously guides the oil at the bottom of the transformer into the vibration box. The real-time power of the oil pump is P X ∝△T,△T real-time exceeding oil temperature difference,△T=T X -T0, T0 is the normal reference oil temperature, T X The oil temperature exceeds the real-time limit.

[0018] ③ The electromagnetic mechanism activates, magnetically attracting the vibration frame. The vibrating metal plate then synchronizes with the vibration, vibrating the oil within the vibration chamber and expelling the mixed gas components. The electromagnetic mechanism's current parameter function is f(t) = λ·I·sin(ωt), where t is the time parameter, I is the standard current value, λ is a coefficient positively correlated with the pump's oil delivery rate, and ω is a coefficient negatively correlated with the oil temperature.

[0019] (2) When the transformer oil temperature drops, the air pressure begins to drop. When the transformer air pressure is lower than the standard value: the electromagnetic mechanism is powered off and stops the magnetic attraction of the vibration frame, and the gas device reversely injects the originally absorbed oil and gas into the vibration box until the transformer air pressure returns to the standard value.

[0020] Compared with the existing technology, the beneficial effects of the present invention are:

[0021] 1. When the transformer oil temperature or pressure exceeds the specified value, the present invention activates the oil pump to direct the oil at the bottom of the transformer oil bath into the vibration box, continuously circulating the oil. Simultaneously, the electromagnetic mechanism activates, driving the vibrating metal plate to vibrate the oil within the vibration chamber. This effectively expels mixed gas components from the oil, reduces bubbles in the transformer oil, and prevents local discharge of bubbles under high electric fields, thereby improving the transformer's insulation strength and ensuring its safe operation.

[0022] 2. In this invention, when the transformer oil temperature or air pressure exceeds the standard, the gas device activates to absorb the excess gas. When the transformer oil temperature drops, causing the air pressure to fall below the standard value, the gas device reversely injects the previously absorbed oil and gas into the vibrating box until the transformer air pressure returns to the standard value. This process achieves precise regulation of the transformer's internal air pressure, ensuring its stability and preventing impurities such as air and moisture from entering the transformer due to abnormal air pressure, which could affect its normal operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the overall structure of the device of the present invention.

[0024] Figure 2 for Figure 1 Schematic diagram of the structure with a partial enlargement at point A in the middle.

[0025] Figure 3 It is a structural diagram of the vibration box and related components in the present invention.

[0026] Figure 4 for Figure 3 Schematic diagram of the structure with a partial enlargement at point B.

[0027] Figure 5 for Figure 3 Schematic diagram of the structure with a partial enlargement at point C in the middle.

[0028] Figure 6 This is a schematic diagram of the disassembled structure of the vibration box, bracket body, vibration metal sheet and related components in the present invention.

[0029] Figure 7 It is a structural schematic diagram of the bracket body and vibration frame in the present invention.

[0030] Figure 8 It is a structural schematic diagram of the vibrating metal sheet in the present invention.

[0031] Among them: 1-transformer; 2-vibration box, 201-injection chamber, 202-vibration chamber, 203-upper guide structure, 204-upper sliding sleeve; 3-bracket body, 301-vertical plate, 302-outlet, 303-lower guide structure, 304-lower sliding sleeve; 4-vibration metal sheet, 401-edge notch, 402-circulation hole; 5-electromagnetic mechanism, 501-electromagnet, 502-magnetic gap; 6-vibration frame, 601-upper rod body, 602-lower rod body, 603-magnet part; 7-return pipe; 8-oil pump; 9-gas device; 10-air pipe; 11-tube valve; 12-circulation slot; 13-slot. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] Example 1, please refer to Figure 1 、 Figure 2 The oil-immersed transformer internal pressure regulating device of the present invention mainly comprises a transformer 1, a vibration box 2, a bracket body 3, a vibration metal sheet 4, an electromagnetic mechanism 5, a vibration frame 6, a return pipe 7, an oil pump 8, a gas device 9, an air pipe 10, an electron tube valve 11 and other components. The specific functions of each component are as follows:

[0034] Transformer 1: As the core equipment of the entire device, during operation, dissolved gases in the insulating oil can precipitate and form bubbles due to fluctuations in oil temperature and pressure. This affects the insulation strength and safe operation, necessitating pressure regulation and oil treatment. Furthermore, the transformer itself is equipped with independent temperature and pressure sensors to monitor the temperature and pressure inside the transformer in real time, providing data for subsequent regulation.

[0035] Vibration Box 2: See Figure 1 、 Figure 2 、 Figure 3 , installed on the top of the transformer 1, an injection chamber 201 is formed between its side plate and the vertical plate 301 of the bracket body 3, which is used to guide the injection of oil. A vibration chamber 202 is formed between the two vertical plates 301, which is the main space for the oil to vibrate and degas. An electromagnetic mechanism 5 is configured on the top to provide a power source for the vibration of the vibration frame 6 and the vibration metal sheet 4. Figure 4 The top plate is provided with an upper guide structure 203, and an upper sliding sleeve 204 is configured at the position of the upper guide structure 203 to guide the upper rod body 601 of the vibration frame 6 to ensure the stability of the vibration frame 6 during the vibration process.

[0036] Bracket body 3: Please refer to Figure 2 、 Figure 3 、 Figure 7, inserted into the vibration box 2, its bottom plate is provided with an outlet 302 connecting the inner cavity of the vibration box 2 with the inner cavity of the transformer 1, so that the treated oil can flow back into the transformer 1. It includes two vertical plates 301 inserted into the vibration box 2, the vertical plates 301 and the side plates of the vibration box 2 form an injection cavity 201, and the space between the two vertical plates 301 is used to install the vibration frame 6. Figure 7 , the vertical plate 301 and the vibration frame 6 are provided with slots 13 for horizontally inserting the vibration metal sheet 4, which facilitates the installation and replacement of the vibration metal sheet 4. Figure 5 The bottom plate of the bracket body 3 is provided with a lower guide structure 303 , and a lower sliding sleeve 304 is configured at the position of the lower guide structure 303 for guiding the lower rod body 602 of the vibration frame 6 .

[0037] Vibrating metal sheet 4: see Figure 2 、 Figure 3 、 Figure 8 , it is movably inserted into the vertical plate 301 and the vibration frame 6, with the side end inserted into the injection cavity 201 and provided with a side notch 401. When the oil flows, the side notch 401 can change the flow state of the oil and enhance the interaction between the oil and the vibrating metal sheet 4. A flow hole 402 is vertically provided in the area of ​​the vibration cavity 202, and the oil can flow between the vibrating metal sheets 4 at different layers through the flow hole 402. The diameter of the flow hole 402 of the vibrating metal sheet 4 at the upper side is larger than the diameter of the flow hole 402 of the vibrating metal sheet 4 at the lower side. This design helps to control the flow speed and direction of the oil in the vibration cavity 202, so that the oil gradually slows down during the upward flow and degassing is more sufficient.

[0038] Electromagnetic mechanism 5: Please refer to Figure 2 、 Figure 3 , installed on the top of the vibration box 2, with a built-in electromagnet 501. When the electromagnetic mechanism 5 is activated, the electromagnet 501 magnetically attracts the magnet part 603 on the top of the vibration frame 6, causing the vibration frame 6 to drive the vibrating metal sheet 4 to vibrate, thereby vibrating the oil body entering the vibration chamber 202 and expelling the mixed gas components in the oil body. Its current parameter function changes as f(t) = λ·I·sin(ωt), where t is the time parameter, I is the standard current value, λ is a coefficient positively correlated with the oil supply rate of the oil pump 8, and ω is a coefficient negatively correlated with the oil temperature. Through this current change method, the vibration frequency and amplitude can be dynamically adjusted according to actual conditions such as oil temperature and oil pump supply rate.

[0039] Vibration Stand 6: Please refer to Figure 2 、 Figure 3 、 Figure 4 、 Figure 7, it is movably mounted between the two vertical plates 301 of the bracket body 3, with an upper rod body 601 on the upper side and a lower rod body 602 on the lower side. The top is provided with a magnet part 603 that cooperates with the electromagnet 501. Under the action of the electromagnetic mechanism 5, the vibration frame 6 realizes up and down vibration through the magnetic attraction of the magnet part 603 and the electromagnet 501, thereby driving the vibration metal sheet 4 to vibrate synchronously. Figure 4 、 Figure 5 The upper rod body 601 is assembled on the inner periphery of the upper sliding sleeve 204, and the lower rod body 602 is assembled on the inner periphery of the lower sliding sleeve 304, ensuring that the vibration frame 6 moves stably in a predetermined direction during the vibration process.

[0040] Return pipe 7: Please refer to Figure 1 、 Figure 3 、 Figure 7 , connecting the oil-immersed bottom of the transformer 1 and the injection cavity 201 of the vibration box 2, is a channel for oil circulation, so that the oil at the bottom of the transformer 1 can be transported to the vibration box 2 for treatment, and the treated oil then returns to the transformer 1 through the outflow port 302 and the return pipe 7.

[0041] Oil pump 8: see Figure 1 , installed on the return pipe 7, after starting, it continuously guides the oil at the bottom of the transformer 1 into the vibration box 2. Its real-time power P X ∝ΔT, ΔT=T X -T0, T0 is the normal reference oil temperature, T X In order to detect the oil temperature exceeding the standard in real time, the oil pump power is automatically adjusted according to the oil temperature exceeding the standard. The greater the oil temperature exceeds the standard, the greater the oil pump power is and the greater the oil flow rate is, so as to meet the needs of oil treatment in different situations.

[0042] Gas device 9: see Figure 1 , configured outside the transformer 1. The gas pipe 10 connects the vibration box 2 and the gas device 9, and is a channel for gas transmission. It provides a path for the flow of gas during the process of the gas device 9 absorbing excessive gas and reversely injecting oil and gas. When the oil temperature of the transformer 1 exceeds the standard or the air pressure exceeds the standard, the gas device 9 starts to absorb the excessive gas; when the oil temperature of the transformer 1 drops and the air pressure is lower than the standard value, the gas device 9 reversely injects the originally absorbed oil and gas into the vibration box 2 until the air pressure of the transformer 1 returns to the standard value, thereby realizing precise regulation of the air pressure inside the transformer 1. Combined with Figure 2 The electron tube valve 11 is arranged on the air pipe 10 between the vibration box 2 and the gas device 9, and is used to control the flow state of the gas in the air pipe 10, to achieve precise control of the gas exchange between the gas device 9 and the vibration box 2, and to ensure that the gas absorption and injection operations are accurately carried out under different working conditions.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An internal air pressure regulating device for an oil-immersed transformer, characterized in that: It comprises a vibration box (2) installed on the top of a transformer (1), the vibration box (2) is inserted with a bracket body (3), and the bottom plate of the bracket body (3) is provided with an outlet (302) connecting the inner cavity of the vibration box (2) and the inner cavity of the transformer (1); The support body (3) includes two vertical plates (301) inserted into the vibration box (2), and a vibration frame (6) is movably installed between the two vertical plates (301); An injection cavity (201) is formed between the side plates of the vibration box (2) and the vertical plates (301), and a plurality of vibration metal sheets (4) are movably inserted into the two vertical plates (301) and the vibration frame (6). The side ends of the vibration metal sheets (4) are inserted into the injection cavity (201) and are provided with edge notches (401). A vibration cavity (202) is formed between the two vertical plates (301) of the vibration box (2); the vertical plates (301) and the vibration frame (6) are provided with flow slots (12) located between adjacent vibration metal sheets (4); and the vibration metal sheets (4) are vertically provided with flow holes (402) located in the region of the vibration cavity (202); The top of the vibration box (2) is provided with an electromagnetic mechanism (5), the electromagnetic mechanism (5) has an electromagnet (501) built in, and the top of the vibration frame (6) is provided with a magnet portion (603) that is magnetically coupled with the electromagnet (501); A return pipe (7) is installed between the oil-immersed bottom of the transformer (1) and the injection cavity (201) of the vibration box (2), and the return pipe (7) is equipped with an oil pump (8); The top of the vibration box (2) is connected to an air pipe (10), and the air pipe (10) is connected to a gas device (9) arranged outside the transformer (1).

2. The internal air pressure regulating device of an oil-immersed transformer according to claim 1, characterized in that: The vertical plate (301) and the vibration frame (6) are provided with slots (13) for horizontally inserting the vibration metal sheet (4).

3. The internal air pressure regulating device of an oil-immersed transformer according to claim 1, characterized in that: The diameter of the flow hole (402) of the upper vibration metal piece (4) is larger than the diameter of the flow hole (402) of the lower vibration metal piece (4).

4. The internal air pressure regulating device of an oil-immersed transformer according to claim 1, characterized in that: An upper rod body (601) is provided on the upper side of the vibration frame (6), and a lower rod body (602) is provided on the lower side, wherein the magnet portion (603) is located at the top of the upper rod body (601); The top plate of the vibration box (2) is provided with an upper guide structure (203), an upper sliding sleeve (204) is arranged at the position of the upper guide structure (203), and the upper rod body (601) is assembled on the inner periphery of the upper sliding sleeve (204); The bottom plate of the bracket body (3) is provided with a lower guide structure (303), a lower sleeve (304) is arranged at the position of the lower guide structure (303), and the lower rod body (602) is assembled on the inner periphery of the lower sleeve (304).

5. The internal air pressure regulating device of an oil-immersed transformer according to claim 1, characterized in that: There is a magnetic attraction gap (502) between the magnet portion (603) and the electromagnet (501), and the size of the magnetic attraction gap (502) is smaller than the maximum deformation displacement size of the vibrating metal sheet (4) in the vertical direction.

6. The internal air pressure regulating device of an oil-immersed transformer according to claim 1, characterized in that: The gas pipe (10) between the vibration box (2) and the gas device (9) is provided with an electron tube valve (11).

7. The internal air pressure regulating device of an oil-immersed transformer according to claim 1, characterized in that: The transformer (1) body is independently equipped with a temperature sensor and an air pressure sensor.

8. The internal air pressure regulating device of an oil-immersed transformer according to claim 1, characterized in that: Including its control method, the contents are as follows: During the load operation of the transformer (1), when the oil temperature of the transformer (1) exceeds the standard or the gas pressure exceeds the standard: ① The gas device (9) is started to absorb the excessive gas; ② The oil pump (8) starts and continuously guides the oil at the bottom of the transformer (1) into the vibration box (2). The real-time power of the oil pump (8) is P X ∝ΔT, ΔT real-time exceeding oil temperature difference, ΔT=T X -T0, T0 is the normal reference oil temperature, T X Real-time oil temperature exceeding the standard; ③ The electromagnetic mechanism (5) is started, magnetically attracting the vibration frame (6), and the vibrating metal sheet (4) is synchronously actuated to vibrate the oil body entering the vibration chamber (202), thereby discharging the mixed gas components in the oil body; The parameter function of the current flowing through the electromagnetic mechanism (5) is f(t)=λ·I·sin(ωt), wherein t is a time parameter, I is a standard current value, λ is a coefficient positively correlated with the oil supply rate of the oil pump (8), and ω is a coefficient negatively correlated with the oil temperature. When the oil temperature of the transformer (1) drops, the gas pressure begins to drop. When the gas pressure of the transformer (1) is lower than the standard value, the electromagnetic mechanism (5) is powered off and stops the magnetic attraction action on the vibration frame (6). The gas device (9) reversely injects the originally absorbed oil and gas into the vibration box (2) until the gas pressure of the transformer (1) returns to the standard value.

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