Air insulation type voltage transformer

Abstract

The utility model discloses an air insulation type voltage transformer which comprises an insulation machine shell, an air inlet reserved pipe fitting and an air outlet reserved pipe fitting, and an iron core is installed in the insulation machine shell. According to the utility model, the insulating casing and the like are arranged, so that when the device is used, the air inlet reserved pipe fitting and the air outlet reserved pipe fitting on the insulating casing are respectively butted with the corresponding insulating protection air storage equipment and air extracting pump equipment, and subsequently, the switch control valve on the air outlet reserved pipe fitting is opened, so that air in the insulating casing can be extracted; a vacuum air pressure sensor is used for monitoring the air pressure value in the insulating machine shell in real time, when it is monitored that the insulating machine shell is in a vacuum state, a switch control valve on an air outlet reserved pipe fitting is closed, a switch control valve on an air inlet reserved pipe fitting is opened, and insulating gas is pumped into the insulating machine shell through external insulating protection air storage equipment; therefore, the device achieves a better air insulation function.

Description

Technical Field

[0001] The utility model relates to the technical field of voltage transformers, and particularly relates to an air-insulated voltage transformer. Background Technique

[0002] The function of a voltage transformer is to convert the high voltage of the primary circuit into the low voltage of the secondary circuit and provide a voltage power supply for measuring instruments and relay protection devices. It also has two windings, one called the primary winding and the other called the secondary winding. Both windings are installed on or wound around an iron core. However, there are still some defects when the voltage transformer is specifically used.

[0003] For example, a voltage transformer disclosed in the patent application No. 202020072016.4 includes a primary winding, a secondary winding, an auxiliary winding, and a circuit for suppressing the zero-sequence current of the voltage transformer. The circuit for suppressing the zero-sequence current of the voltage transformer includes a double-tuned filter. This utility model uses a double-tuned filter to absorb harmonics of different frequencies, and has a good effect on suppressing the zero-sequence current of the primary coil of the voltage transformer. However, it still has insufficient insulation protection for the winding structure inside the voltage transformer and is not easy to achieve comprehensive and energy-saving air insulation protection, resulting in low safety performance of the device. Content of the Utility Model

[0004] The purpose of the utility model is to provide an air-insulated voltage transformer to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: An air-insulated voltage transformer includes an insulating housing, an air inlet reserved pipe fitting, and an air outlet reserved pipe fitting. An iron core is installed inside the insulating housing. A primary coil and a secondary coil are sequentially wound around the iron core. Primary connection terminals and secondary connection terminals that match the primary coil and the secondary coil are respectively arranged at the top and bottom of the insulating housing. A threaded installation groove is welded at the middle position of the top of the insulating housing. A vacuum pressure sensor is threadedly connected to the threaded installation groove. A threaded installation insertion rod that matches the threaded installation groove is arranged at the bottom of the vacuum pressure sensor. A liquid crystal display screen is arranged on one side of the vacuum pressure sensor. The air inlet reserved pipe fitting and the air outlet reserved pipe fitting are respectively welded to both ends of the insulating housing. Switch control valves are installed on both the air inlet reserved pipe fitting and the air outlet reserved pipe fitting.

[0006] Preferably, 2 primary connection terminals and 2 secondary connection terminals are provided.

[0007] Preferably, an assembly base is welded at the bottom of the insulating housing.

[0008] Preferably, fixing screw holes are provided at the four corners of the assembly base, facilitating the fixed installation of the assembly base through screws.

[0009] Preferably, a rubber buffer pad is vulcanized and connected to the bottom of the assembly base, enhancing the anti-slip and stability performance of the assembly base.

[0010] Preferably, copper alloy heat dissipation fins are evenly welded to the outer side wall of the insulating housing, improving the heat conduction and dissipation performance of the outer wall of the insulating housing.

[0011] Preferably, a rubber sealing ring is provided on the threaded installation groove, enhancing the sealing effect when the vacuum pressure sensor is assembled on the insulating housing.

[0012] Preferably, threaded sealing plugs are threadedly connected to the tops of the air inlet reserved pipe fitting and the air outlet reserved pipe fitting, enhancing the sealing effect when the air inlet reserved pipe fitting and the air outlet reserved pipe fitting are closed.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] (1) By installing a switch control valve and the like, the air-insulated voltage transformer optimizes its own performance. The air inlet reserved pipe fitting and the air outlet reserved pipe fitting on the insulating housing are respectively docked with the corresponding insulating protection air storage device and the air extraction pump device. Subsequently, by opening the switch control valve on the air outlet reserved pipe fitting, the gas inside the insulating housing can be pumped out, and the air pressure value inside the insulating housing can be real-time monitored by the vacuum pressure sensor. Secondly, the liquid crystal display screen provided on the vacuum pressure sensor also facilitates the user to directly observe the air pressure value inside the insulating housing. When it is monitored that the inside is in a vacuum state, the switch control valve on the air outlet reserved pipe fitting is closed, and the switch control valve on the air inlet reserved pipe fitting is opened. The insulating gas is pumped into the insulating housing through the externally connected insulating protection air storage device. This enables the device to achieve a good air insulation function, improves the insulation protection performance during the use of the device, and with this kind of air inlet and outlet adjustment mechanism, it is convenient to perform insulation treatment again after the device is overhauled once, making the device more flexible.

[0015] (2) By installing an insulating housing and the like, the air-insulated voltage transformer optimizes its own structure. The user can utilize the threaded connection between the threaded installation groove on the top of the insulating housing and the threaded installation plug provided at the bottom of the vacuum pressure sensor to realize the independent disassembly and maintenance of the vacuum pressure sensor.

[0016] (3) The air-insulated voltage transformer is equipped with copper alloy heat dissipation fins, etc. When the device is in use, on the one hand, copper alloy heat dissipation fins are evenly welded on the outer side wall of the insulating housing, which improves the heat conduction and dissipation performance of the outer wall of the insulating housing. And by setting a rubber sealing ring on the threaded installation groove, the sealing effect during the assembly of the vacuum pressure sensor on the insulating housing is improved. On the other hand, the user can use the fixing screw holes provided at the four corners of the assembly base to fixedly install the assembly base with screws. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a front view structural schematic diagram of the present utility model;

[0018] Figure 2 is a front view sectional structural schematic diagram of the insulating housing of the present utility model;

[0019] Figure 3 is a bottom view structural schematic diagram of the assembly base of the present utility model;

[0020] Figure 4 is a rear view structural schematic diagram of the disassembled state of the vacuum pressure sensor of the present utility model;

[0021] Figure 5 of the present utility model Figure 1 is an enlarged structural schematic diagram at position A in

[0022] In the figure: 1, threaded installation groove; 2, vacuum pressure sensor; 3, primary wiring terminal; 4, insulating housing; 5, intake reserved pipe fitting; 6, assembly base; 7, secondary wiring terminal; 8, copper alloy heat dissipation fin; 9, primary coil; 10, iron core; 11, secondary coil; 12, fixing screw hole; 13, rubber buffer pad; 14, liquid crystal display screen; 15, threaded installation plug; 16, threaded sealing plug; 17, outlet reserved pipe fitting; 18, switch control valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present utility model belong to the protection scope of the present utility model.

[0024] Please refer to Figures 1-5, An embodiment provided by the present utility model: An air-insulated voltage transformer, including an insulating housing 4, an air inlet reserved pipe fitting 5 and an air outlet reserved pipe fitting 17. A core 10 is installed inside the insulating housing 4, and a primary coil 9 and a secondary coil 11 are sequentially wound around the core 10. A primary wiring terminal 3 and a secondary wiring terminal 7 that match the primary coil 9 and the secondary coil 11 are respectively arranged at the top and bottom of the insulating housing 4;

[0025] A threaded mounting groove 1 is welded at the middle position of the top of the insulating housing 4. A vacuum pressure sensor 2 is threadedly connected to the threaded mounting groove 1. A threaded mounting plug rod 15 that matches the threaded mounting groove 1 is arranged at the bottom of the vacuum pressure sensor 2;

[0026] During use, the user can utilize the threaded connection between the threaded mounting groove 1 at the top of the insulating housing 4 and the threaded mounting plug rod 15 arranged at the bottom of the vacuum pressure sensor 2 to realize the independent disassembly and maintenance of the vacuum pressure sensor 2;

[0027] A liquid crystal display screen 14 is arranged on one side of the vacuum pressure sensor 2;

[0028] The air inlet reserved pipe fitting 5 and the air outlet reserved pipe fitting 17 are respectively welded to both ends of the insulating housing 4. Switch control valves 18 are installed on both the air inlet reserved pipe fitting 5 and the air outlet reserved pipe fitting 17;

[0029] During use, the air inlet reserved pipe fitting 5 and the air outlet reserved pipe fitting 17 on the insulating housing 4 are respectively docked with the corresponding insulating protection air storage device and the air extraction pump device. Subsequently, open the switch control valve 18 on the air outlet reserved pipe fitting 17, and the gas inside the insulating housing 4 can be pumped out, and the air pressure value inside the insulating housing 4 can be monitored in real time through the vacuum pressure sensor 2. Secondly, it is also convenient for the user to directly observe the air pressure value inside the insulating housing 4 by using the liquid crystal display screen 14 arranged on the vacuum pressure sensor 2. When it is monitored that it is in a vacuum state, close the switch control valve 18 on the air outlet reserved pipe fitting 17 and open the switch control valve 18 on the air inlet reserved pipe fitting 5, and pump the insulating gas into the insulating housing 4 through the externally connected insulating protection air storage device. This enables the device to achieve a good air insulation function and improve the insulation protection performance during the use of the device. Moreover, by using this kind of air inlet and outlet adjustment mechanism, it is convenient to perform insulation treatment again after the device completes one overhaul, which makes the device more flexible;

[0030] There are 2 primary wiring terminals 3 and 2 secondary wiring terminals 7;

[0031] An assembly base 6 is welded at the bottom of the insulating housing 4;

[0032] Fixing screw holes 12 are arranged at the four corners of the assembly base 6, making it convenient to fixedly install the assembly base 6 with screws;

[0033] A rubber buffer pad 13 is vulcanized and connected to the bottom of the assembly base 6, which improves the anti-slip and stability performance of the assembly base 6;

[0034] Copper alloy heat dissipation fins 8 are evenly welded to the outer side wall of the insulating housing 4, which improves the heat conduction and dissipation performance of the outer wall of the insulating housing 4;

[0035] A rubber sealing ring is provided in the threaded installation groove 1, which improves the sealing effect when the vacuum pressure sensor 2 is assembled on the insulating housing 4;

[0036] Threaded sealing plugs 16 are threadedly connected to the tops of the air inlet reserved pipe fitting 5 and the air outlet reserved pipe fitting 17, which improves the sealing effect when the air inlet reserved pipe fitting 5 and the air outlet reserved pipe fitting 17 are closed.

[0037] When the embodiment of the present application is in use: The user can fix and install the assembly base 6 by screws using the fixing screw holes 12 provided at the four corners of the assembly base 6. During actual use, the air inlet reserved pipe fitting 5 and the air outlet reserved pipe fitting 17 on the insulating housing 4 are respectively docked with the corresponding insulating protection air storage device and the air extraction pump device. Subsequently, by opening the switch control valve 18 on the air outlet reserved pipe fitting 17, the gas inside the insulating housing 4 can be pumped out, and the air pressure value inside the insulating housing 4 can be monitored in real time by the vacuum pressure sensor 2. Secondly, the liquid crystal display screen 14 provided on the vacuum pressure sensor 2 also facilitates the user to directly observe the air pressure value inside the insulating housing 4. When it is monitored that it is in a vacuum state, the switch control valve 18 on the air outlet reserved pipe fitting 17 is closed, and the switch control valve 18 on the air inlet reserved pipe fitting 5 is opened, and insulating gas is pumped into the insulating housing 4 through an external insulating protection air storage device. This enables the device to achieve a good air insulation function and improves the insulation protection performance during the use of the device. Moreover, using this kind of air inlet and outlet adjustment mechanism, it is convenient to perform insulation treatment again after the device completes one overhaul, which makes the device more flexible. Furthermore, the user can realize the independent disassembly and maintenance of the vacuum pressure sensor 2 by using the threaded connection between the threaded installation groove 1 on the top of the insulating housing 4 and the threaded installation plug 15 provided at the bottom of the vacuum pressure sensor 2. In addition, by evenly welding copper alloy heat dissipation fins 8 on the outer side wall of the insulating housing 4, the heat conduction and dissipation performance of the outer wall of the insulating housing 4 is improved, and by providing a rubber sealing ring in the threaded installation groove 1, the sealing effect when the vacuum pressure sensor 2 is assembled on the insulating housing 4 is improved.

Claims

1. An air-insulated voltage transformer, characterized in that: The invention comprises an insulating housing (4), an air inlet reserved pipe fitting (5) and an air outlet reserved pipe fitting (17); an iron core (10) is installed inside the insulating housing (4); a primary coil (9) and a secondary coil (11) are wound around the iron core (10) in sequence; a primary wiring terminal (3) and a secondary wiring terminal (7) matching the primary coil (9) and the secondary coil (11) are respectively arranged at the top and bottom of the insulating housing (4); a threaded mounting groove (1) is welded at the middle position of the top of the insulating housing (4). The threaded mounting groove (1) is threadedly connected to a vacuum pressure sensor (2); a threaded mounting plug rod (15) matching the threaded mounting groove (1) is provided at the bottom of the vacuum pressure sensor (2); a liquid crystal display screen (14) is provided on one side of the vacuum pressure sensor (2); the air intake reserved pipe fitting (5) and the air outlet reserved pipe fitting (17) are respectively welded to two ends of the insulating housing (4); and a switch control valve (18) is installed on both the air intake reserved pipe fitting (5) and the air outlet reserved pipe fitting (17).

2. An air-insulated voltage transformer according to claim 1, characterized in that: Two of the primary wiring terminals (3) and two of the secondary wiring terminals (7) are provided.

3. The air-insulated voltage transformer according to claim 1, characterized in that: An assembly base (6) is welded to the bottom of the insulating housing (4).

4. An air-insulated voltage transformer according to claim 3, characterized in that: Fixing screw holes (12) are provided at the four corners of the assembly base (6).

5. The air-insulated voltage transformer according to claim 3, characterized in that: A rubber buffer pad (13) is vulcanized and connected to the bottom of the assembly base (6).

6. The air-insulated voltage transformer according to claim 1, characterized in that: Copper alloy heat dissipation fins (8) are uniformly welded to the outer side wall of the insulating housing (4).

7. The air-insulated voltage transformer according to claim 1, characterized in that: A rubber sealing ring is provided on the threaded mounting groove (1).

8. The air-insulated voltage transformer according to claim 1, characterized in that: The tops of the air inlet reserved pipe fitting (5) and the air outlet reserved pipe fitting (17) are both threadedly connected with threaded sealing plugs (16).

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