A leakage-compensated clean air voltage transformer

Abstract

A leakage-compensated clean air voltage transformer belongs to the technical field of voltage transformers and includes a transformer body. The inner cavity of the transformer body's shell is filled with an insulating medium, which is clean air mixed with oxygen and nitrogen. The shell is provided with a pressure sensor for monitoring the pressure of the clean air in the inner cavity of the shell. The shell is connected to an air supply system that can replenish clean air into the inner cavity of the shell. The pressure sensor is electrically connected to the air supply system and can control the air supply system. The leakage-compensated clean air voltage transformer described in the present invention has a reasonable design, a simple structure, and real-time monitoring and automatic compensation functions. It is easy to operate and has high work efficiency. It not only effectively saves manpower and material resources, but also ensures the stable operation of the voltage transformer, making it suitable for promotion.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage transformers, and in particular to a leakage-compensated clean air voltage transformer. Background Art

[0002] A tank-type voltage transformer (VVT) is a gas-insulated, metal-enclosed voltage transformer. It uses the principle of electromagnetic induction to proportionally convert the voltage in a high-voltage system to a lower voltage for use in measurement, protection, and automatic control devices. The VVT ​​operates based on the law of electromagnetic induction. It typically consists of two insulated windings with different turns around a closed iron core: the primary winding N1, which connects to the power supply, and the secondary winding N2, which connects to the output. VVTs are widely used in power systems and industrial automation control, particularly in high-voltage substations, where they are often used to measure and protect equipment such as transformers, switchgear, and cables.

[0003] Insulating gases are gaseous media used to isolate electrodes and prevent electrical conduction in electrical equipment. They are primarily used in high-voltage electrical equipment and systems to prevent arcing and flashovers and improve insulation performance. These gases can fill or surround the non-conductive parts of electrical equipment, ensuring safe operation under high voltage. Common insulating gases on the market include dry air, nitrogen, and sulfur hexafluoride. Insulating gases play a vital role in electrical equipment. By selecting the appropriate insulating gas and implementing appropriate environmental protection measures, the safe and stable operation of the power system can be ensured while reducing negative environmental impacts.

[0004] Although the existing tank-type voltage transformer adopts a metal-enclosed structure, leakage problems still occur during actual use. At present, regular manual inspections are generally used for on-site detection. This traditional inspection method consumes a lot of manpower and material resources, has low work efficiency, and has a "gap period", making it difficult to detect leakage problems in time. At the same time, after the voltage transformer is discharged, non-original gases such as nitric oxide and nitrogen dioxide will appear in the inner cavity of its shell. Regular manual inspections are also difficult to detect this problem in time. Over time, the purity of the insulating gas will be reduced, affecting the stable operation of the voltage transformer. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the existing technology of voltage transformer detection, the large amount of manpower and material resources consumed, and the low work efficiency, and to provide a leakage-compensated clean air voltage transformer with reasonable design, simple structure, real-time monitoring and automatic compensation functions, low operation difficulty, and high work efficiency. It can not only effectively save manpower and material resources, but also ensure the stable operation of the voltage transformer, and is suitable for promotion.

[0006] The present invention is achieved through the following technical solution: a leakage-compensated clean air voltage transformer, comprising a transformer body, the inner cavity of the outer shell of the transformer body being filled with an insulating medium, the insulating medium being clean air mixed with oxygen and nitrogen, the air pressure of the clean air in the inner cavity of the outer shell being not greater than 0.8 MPa and not less than 0.7 MPa, a pressure sensor being provided on the outer shell, the pressure sensor being used to monitor the air pressure of the clean air in the inner cavity of the outer shell; the outer shell being connected to an air supply system, the air supply system being capable of replenishing clean air into the inner cavity of the outer shell, the pressure sensor being electrically connected to the air supply system, the pressure sensor being capable of controlling the air supply system, and when the air pressure in the inner cavity of the outer shell is less than 0.7 MPa, the pressure sensor controls the air supply system to replenish air, and when the air pressure is replenished to 0.8 MPa, the pressure sensor controls the air supply system to stop replenishing air.

[0007] A further improvement of the present invention is that the air supply system includes a high-pressure oxygen cylinder, a high-pressure nitrogen cylinder and an air supply valve installed on the outer shell, the high-pressure oxygen cylinder is connected to an oxygen delivery pipe, the high-pressure nitrogen cylinder is connected to a nitrogen delivery pipe, the oxygen delivery pipe and the nitrogen delivery pipe are commonly connected to a mixing box, the mixing box is connected to a main delivery pipe, the main delivery pipe is connected to the air supply valve, the air supply valve is electrically connected to a pressure sensor, and the pressure sensor controls the operation of the air supply system by controlling the air supply valve.

[0008] A further improvement of the present invention is that the gas pressure of the high-pressure oxygen cylinder and the high-pressure nitrogen cylinder is greater than 1 MPa, and a gas pressure controller is provided at the main delivery pipe, through which the delivery gas pressure of the main delivery pipe can be made not less than 1 MPa.

[0009] A further improvement of the present invention is that a proportional regulating valve A is provided at the oxygen delivery pipe, and a proportional regulating valve B is provided at the nitrogen delivery pipe. Through the cooperation between the proportional regulating valve A and the proportional regulating valve B, the ratio of oxygen and nitrogen can be adjusted to 8:2.

[0010] A further improvement of the present invention is that the oxygen delivery pipe and the nitrogen delivery pipe are commonly connected to a mixing pipe, and the mixing pipe is connected to the mixing box; the mixing pipe includes a pipe body, and spiral blades are provided on the inner side wall of the pipe body.

[0011] A further improvement of the present invention is that a pressure relief mechanism is provided on the outer shell, the pressure relief mechanism includes a cylinder body, one end of the cylinder body is connected to the outer shell, the other end of the cylinder body is screwed with a sealing cover, and a pressure relief hole is provided at a position of the cylinder body close to the outer shell, a piston is provided inside the cylinder body, a compression spring is provided between the side of the piston facing away from the outer shell and the inner side of the sealing cover, the two ends of the compression spring respectively abut against the piston and the sealing cover, a coaxial sealing rod is provided on the side of the piston facing the outer shell, an exhaust hole corresponding to the sealing rod is provided on the outer shell, the sealing rod is inserted in the exhaust hole, thereby forming a seal for the exhaust hole.

[0012] A further improvement of the present invention is that the pressure sensor is electrically connected to the background system of the transformer body, and the pressure sensor can transmit the air pressure information of the clean air in the inner cavity of the shell to the background system.

[0013] A further improvement of the present invention is that a gas composition detector is provided on the shell, and the gas composition detector is electrically connected to the background system of the transformer body. The gas composition detector is used to monitor the gas composition and mixing ratio of the clean air in the inner cavity of the shell, and transmit the monitoring information to the background system.

[0014] The beneficial effects of the present invention are:

[0015] 1. The voltage transformer's pressure sensor monitors the clean air pressure within the housing in real time. The pressure sensor also works in conjunction with the air supply system to monitor pressure fluctuations and control the system. This design provides real-time monitoring and automatic compensation, making operation easy and efficient, significantly saving manpower and resources.

[0016] 2. The pressure relief mechanism of this voltage transformer has an automatic pressure relief function. When overshoot occurs during the gas replenishment process or the transformer body causes the air pressure in the shell cavity to increase during operation, the pressure can be automatically relieved through the pressure relief mechanism, solving the problem of increased air pressure in the shell cavity and ensuring the normal operation of the voltage transformer.

[0017] 3. The pressure sensor of this voltage transformer is linked to the background system of the transformer body, and the staff can timely understand the air pressure information of the clean air in the inner cavity of the shell through the background system; and the gas composition detector of this voltage transformer is linked to the background system of the transformer body, and the staff can timely understand the composition of the clean air in the inner cavity of the shell through the background system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a structural diagram of a specific embodiment of the present invention.

[0020] Figure 2 It is a structural schematic diagram of the gas replenishing system of a specific embodiment of the present invention.

[0021] Figure 3 It is a structural schematic diagram of a mixing pipeline according to a specific embodiment of the present invention.

[0022] Figure 4 It is a structural schematic diagram of a pressure relief mechanism according to a specific embodiment of the present invention.

[0023] 1. Outer casing; 2. Iron core; 3. Basin insulator; 4. Protective cap; 5. Explosion-proof device; 6. Junction box; 7. Pressure sensor; 8. Air supply system; 801. High-pressure oxygen cylinder; 802. High-pressure nitrogen cylinder; 803. Air supply valve; 804. Oxygen delivery pipe; 805. Nitrogen delivery pipe; 806. Mixing pipe; 8061. Pipe body; 8062. Spiral blade; 807. Mixing box; 808. Main delivery pipe; 9. Pressure relief mechanism; 901. Cylinder body; 902. Sealing cover; 903. Piston; 904. Compression spring; 905. Sealing rod; 10. Gas composition detector; 11. Proportional control valve A; 12. Proportional control valve B; 13. Air pressure controller. DETAILED DESCRIPTION

[0024] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this patent.

[0025] Now refer to Figure 1-4 , combined with a specific embodiment, it is explained as follows: The leakage-compensated clean air voltage transformer described in the present invention includes a transformer body, which is a tank-type voltage transformer. The transformer body is mainly composed of a shell 1, an iron core 2, a pot-type insulator 3, a protective cap 4, an explosion-proof device 5 and a junction box 6. For the specific structure, refer to the existing tank-type voltage transformer.

[0026] The inner cavity of the shell 1 of the transformer body is filled with an insulating medium, which is clean air mixed with oxygen and nitrogen. The air pressure of the clean air in the inner cavity of the shell 1 is not more than 0.8MPa and not less than 0.7MPa. A pressure sensor 7 is provided on the shell 1, and the pressure sensor 7 is used to monitor the air pressure of the clean air in the inner cavity of the shell 1; the shell 1 is connected to the air supply system 8, and the air supply system 8 can replenish clean air into the inner cavity of the shell 1. The pressure sensor 7 is electrically connected to the air supply system 8, and the pressure sensor 7 can control the air supply system 8. When the air pressure of the clean air in the inner cavity of the shell 1 is less than 0.7MPa, the pressure sensor 7 controls the air supply system 8 to replenish air. When the air pressure is equal to 0.8MPa, the pressure sensor 7 controls the air supply system 8 to stop replenishing air.

[0027] Specifically, the gas replenishment system 8 includes a high-pressure oxygen cylinder 801, a high-pressure nitrogen cylinder 802, and a gas replenishment valve 803 mounted on the housing 1. The high-pressure oxygen cylinder 801 is connected to an oxygen delivery pipe 804, and the high-pressure nitrogen cylinder 802 is connected to a nitrogen delivery pipe 805. The oxygen delivery pipe 804 and the nitrogen delivery pipe 805 are jointly connected to a mixing box 807. The mixing box 807 is connected to a main delivery pipe 808, which is connected to the gas replenishment valve 803. The gas replenishment valve 803 is electrically connected to the pressure sensor 7. The pressure sensor 7 controls the gas replenishment valve 803 and thus controls the operation of the gas replenishment system 8. The high-pressure oxygen cylinder 801 and the high-pressure nitrogen cylinder 802 serve as the supplementary gas source. The gas is mixed and temporarily stored in the mixing box 807 according to the required ratio. When replenishment is needed, it is then delivered to the inner cavity of the housing 1 through the gas replenishment valve 803.

[0028] Specifically, the pressure of high-pressure oxygen cylinder 801 and high-pressure nitrogen cylinder 802 is greater than 1 MPa. A pressure controller 13 is provided at main delivery pipe 808. This pressure controller 13 ensures that the delivery pressure of main delivery pipe 808 is no less than 1 MPa. This design ensures that the delivery pressure of main delivery pipe 808 is no less than 1 MPa, thereby ensuring smooth gas replenishment operations.

[0029] Specifically, a proportional control valve A11 is installed on oxygen delivery pipe 804, and a proportional control valve B12 is installed on nitrogen delivery pipe 805. The coordination between proportional control valves A11 and B12 allows the oxygen-nitrogen ratio to be adjusted to 8:2. This design allows the oxygen-nitrogen ratio to be adjusted to a more reasonable 8:2, ensuring clean air quality.

[0030] Specifically, oxygen delivery pipe 804 and nitrogen delivery pipe 805 are connected to a mixing pipe 806, which is connected to a mixing box 807. Mixing pipe 806 includes a pipe body 8061, and spiral blades 8062 are provided on the inner sidewall of pipe body 8061. This design allows the oxygen and nitrogen to be evenly mixed during delivery through pipe body 8061 under the action of spiral blades 8062, greatly improving the mixing effect of the oxygen and nitrogen and shortening the mixing time.

[0031] The working principle of the present invention: combined with the existing sensor technology, the pressure sensor 7 can monitor the air pressure of the clean air in the inner cavity of the shell 1 in real time, and the pressure sensor 7 is linked with the air supply system 8 to control the air supply system 8 by monitoring the change of air pressure. That is, when there is a leak in the shell 1, when the air pressure becomes smaller and is lower than 0.7MPa, the pressure sensor 7 controls the air supply system 8 to supply air. When the air pressure is equal to 0.8MPa, the pressure sensor 7 controls the air supply system 8 to stop supplying air. It can be seen that this voltage transformer has the functions of real-time monitoring of air pressure and automatic air supply. It is simple to operate, has high work efficiency, saves a lot of manpower and material resources, and solves the problem of "gap period" in inspection, so as to deal with the air leakage problem in time.

[0032] In one embodiment, a pressure relief mechanism 9 is provided on the outer shell 1, and the pressure relief mechanism 9 includes a cylinder body 901, one end of the cylinder body 901 is connected to the outer shell 1, and the other end of the cylinder body 901 is screwed with a sealing cover 902, and a pressure relief hole is provided in the cylinder body 901 near the outer shell 1, and a piston 903 is provided inside the cylinder body 901, and a compression spring 904 is provided between the side of the piston 903 facing away from the outer shell 1 and the inner side of the sealing cover 902, and the two ends of the compression spring 904 respectively abut against the piston 903 and the sealing cover 902, and a coaxial sealing rod 905 is provided on the side of the piston 903 facing the outer shell 1, and an exhaust hole corresponding to the sealing rod 905 is provided on the outer shell 1, and the sealing rod 905 is inserted into the exhaust hole to form a seal for the exhaust hole.

[0033] The above-mentioned pressure relief mechanism 9 can relieve the pressure in the inner cavity of the housing 1. The elastic force of the compression spring 904 corresponds to an air pressure of 0.8MPa. Under normal circumstances, under the action of the elastic force, the compression spring 904 always applies an elastic force to the piston 903, thereby allowing the sealing rod 905 to be always inserted into the exhaust hole through the piston 903, thereby ensuring that the exhaust hole is always in a sealed state. It should be noted that the elastic force of the compression spring 904 can be adjusted by rotating the sealing cover 902, so that the compression spring 904 can better correspond to the air pressure in the inner cavity of the housing 1; at the same time, in order to improve the sealing effect, the insertion end of the sealing rod 905 and the exhaust hole adopt a conical design, and the insertion end of the sealing rod 905 can also be made of rubber.

[0034] When overshoot occurs during the air replenishment process or the transformer body causes the air pressure in the housing 1 to rise and exceed 0.8 MPa during operation, the sealing rod 905 is pushed out of the exhaust hole under the action of the air pressure. At this time, the sealing rod 905 pushes the piston 903 to compress the compression spring 904, and the exhaust hole is exhausted. The air is finally discharged through the pressure relief hole on the cylinder body 901. When the air pressure reaches 0.8 MPa, the sealing rod 905 is reinserted into the exhaust hole under the action of the compression spring 904. It can be seen that the pressure relief mechanism 9 has an automatic pressure relief function, which can solve the problem of increased air pressure in the housing 1.

[0035] In one embodiment, pressure sensor 7 is electrically connected to the backend system of the transformer body and can transmit the pressure information of the clean air in the inner cavity of housing 1 to the backend system. Through this design, the staff can obtain the pressure information of the clean air in the inner cavity of housing 1 in a timely manner through the backend system.

[0036] In one embodiment, a gas composition detector 10 is provided on the housing 1 and is electrically connected to the backend system of the transformer body. The gas composition detector 10 is used to monitor the gas composition and mixing ratio of the clean air in the inner cavity of the housing 1 and transmit the monitoring information to the backend system. In conjunction with the instructions for use of the gas composition detector 10, the gas composition detector 10 monitors the clean air in the inner cavity of the housing 1. If non-native gases such as nitric oxide and nitrogen dioxide appear in the inner cavity of the housing 1, the staff can promptly detect this problem through the backend system.

[0037] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0038] The terms "upper," "lower," "outer," "inner," and the like, if used in the present description and claims, and in the accompanying drawings, are used to distinguish relative positions and are not necessarily qualitative. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present invention described herein can be implemented in sequences other than those illustrated or described herein. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions.

[0039] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A leakage-compensated clean air voltage transformer, comprising a transformer body, wherein the inner cavity of the outer shell (1) of the transformer body is filled with an insulating medium, and characterized in that: The insulating medium is clean air mixed with oxygen and nitrogen. The pressure of the clean air in the inner cavity of the shell (1) is not greater than 0.8 MPa and not less than 0.7 MPa. A pressure sensor (7) is provided on the shell (1). The pressure sensor (7) is used to monitor the pressure of the clean air in the inner cavity of the shell (1). The shell (1) is connected to an air supply system (8). The air supply system (8) can supply clean air to the inner cavity of the shell (1). The pressure sensor (7) is electrically connected to the air supply system (8). The pressure sensor (7) can control the air supply system (8). When the pressure of the clean air in the inner cavity of the shell (1) is less than 0.7 MPa, the pressure sensor (7) controls the air supply system (8) to supply air. When the pressure is equal to 0.8 MPa, the pressure sensor (7) controls the air supply system (8) to stop supplying air. The pressure sensor (7) is electrically connected to the background system of the transformer body. The pressure sensor (7) can The pressure information of the clean air in the cylinder is transmitted to the background system; a pressure relief mechanism (9) is provided on the housing (1), and the pressure relief mechanism (9) includes a cylinder body (901), one end of the cylinder body (901) is connected to the housing (1), and the other end of the cylinder body (901) is screwed with a sealing gland (902), and a pressure relief hole is provided at a position of the cylinder body (901) close to the housing, and a piston (903) is provided inside the cylinder body (901), and a compression spring (904) is provided between the side of the piston (903) facing away from the housing (1) and the inner side of the sealing gland (902), and the two ends of the compression spring (904) respectively abut against the piston (903) and the sealing gland (902), and a coaxial sealing rod (905) is provided on the side of the piston (903) facing the housing (1), and an exhaust hole corresponding to the sealing rod (905) is provided on the housing (1), and the sealing rod (905) is inserted into the exhaust hole to form a seal for the exhaust hole.

2. The leakage-compensated clean air voltage transformer according to claim 1, characterized in that: The air supply system (8) includes a high-pressure oxygen cylinder (801), a high-pressure nitrogen cylinder (802), and an air supply valve (803) installed on the housing (1). The high-pressure oxygen cylinder (801) is connected to an oxygen delivery pipe (804), the high-pressure nitrogen cylinder (802) is connected to a nitrogen delivery pipe (805), the oxygen delivery pipe (804) and the nitrogen delivery pipe (805) are connected to a mixing box (807), the mixing box (807) is connected to a main delivery pipe (808), the main delivery pipe (808) is connected to the air supply valve (803), the air supply valve (803) is electrically connected to the pressure sensor (7), and the pressure sensor (7) controls the operation of the air supply system (8) by controlling the air supply valve (803).

3. The leakage-compensated clean air voltage transformer according to claim 2, characterized in that: The gas pressure of the high-pressure oxygen cylinder (801) and the high-pressure nitrogen cylinder (802) is greater than 1 MPa. A gas pressure controller (13) is provided at the main delivery pipe (808). The gas pressure controller (13) can ensure that the delivery gas pressure of the main delivery pipe (808) is not less than 1 MPa.

4. The leakage-compensated clean air voltage transformer according to claim 3, characterized in that: A proportional regulating valve A (11) is provided at the oxygen delivery pipe (804), and a proportional regulating valve B (12) is provided at the nitrogen delivery pipe (805). By cooperating between the proportional regulating valve A (11) and the proportional regulating valve B (12), the ratio of oxygen to nitrogen can be adjusted to 8:

2.

5. The leakage-compensated clean air voltage transformer according to claim 4, characterized in that: The oxygen delivery pipe (804) and the nitrogen delivery pipe (805) are connected to a mixing pipe (806), and the mixing pipe (806) is connected to a mixing box (807); the mixing pipe (806) includes a pipe body (8061), and a spiral blade (8062) is provided on the inner side wall of the pipe body (8061).

6. The leakage-compensated clean air voltage transformer according to claim 5, characterized in that: A gas composition detector (10) is provided on the housing (1). The gas composition detector (10) is electrically connected to the background system of the transformer body. The gas composition detector (10) is used to monitor the gas composition and mixing ratio of the clean air in the inner cavity of the housing (1) and transmit the monitoring information to the background system.

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