Multifunctional sleeve protective cover and test device

Abstract

The invention relates to a multifunctional casing protective cover and a test device. The casing pipe protective cover comprises an in-oil casing pipe protective cover and an air side casing pipe protective cover, a vertically-installed main body casing pipe is arranged in the in-oil casing pipe protective cover, one end of the in-oil casing pipe protective cover is connected with an ascending flanged base, and the end, away from the in-oil casing pipe protective cover, of the ascending flanged base is connected with the air side casing pipe protective cover; the surface of the air side sleeve protective cover is provided with an air isolation valve through an air conveying pipeline, and the air inlet end of the air conveying pipeline is connected with a protective cover inflation device; the casing protective cover is provided with the air-side casing protective cover and the in-oil casing protective cover, the air-side casing protective cover and the in-oil casing protective cover are connected with the ascending flanged base through the flange plate and the fixing piece to form a complete cover body, the whole main body casing is covered in the complete cover body, and the whole device is simple in structure and meets the field installation and test requirements of the single-phase 500kV transformer; therefore, the device is more convenient to use and detect.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer manufacturing, and in particular relates to a multifunctional bushing protective cover and a testing device. Background Art

[0002] High-voltage bushings are devices that allow one or several conductors to pass through partitions such as walls or boxes, and serve as insulation and support. They are important equipment in power systems.

[0003] Generally, the installation of high-voltage bushings is a detachable lead structure. When a single-phase 500kV transformer is used as a spare phase and is stored at the work site for a long time, in order to ensure the performance of the transformer high-voltage bushing, it is necessary to consider the on-site protection, transportation, testing and maintenance requirements of the high-voltage bushing. However, the existing high-voltage bushing has a complex structure, which makes it inconvenient to use during operation. Therefore, a protective cover is provided to solve this problem. Summary of the invention

[0004] The purpose of the present invention is to provide a casing protective cover with simple structure and reasonable design in order to solve the above problems.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] A first aspect of the present invention provides a multifunctional casing protection cover, comprising an oil casing protection cover and an air side casing protection cover, wherein a vertically installed main casing is arranged in the oil casing protection cover, one end of the oil casing protection cover is connected to a lifting seat, and one end of the lifting seat away from the oil casing protection cover is connected to the air side casing protection cover;

[0007] The surface of the air side casing protective cover passes through a gas isolation valve of a gas delivery pipeline, and the air inlet end of the gas delivery pipeline is connected to a protective cover inflation device;

[0008] One end of the main sleeve located in the air side sleeve protective cover is connected with a sleeve pressure equalizing ball.

[0009] As a further optimization scheme of the present invention, two sets of flanges are provided on the outer side of the main sleeve, and multiple sets of fasteners are provided on the two sets of flanges. The two sets of flanges cooperate with the multiple sets of fasteners to respectively connect the oil sleeve protective cover and the lifting seat and the air side sleeve protective cover and the lifting seat.

[0010] As a further optimization scheme of the present invention, seals are placed between the lifting seat and the two sets of flanges, between the oil-in-tube protective cover and the flanges connected thereto, and between the air-side tube protective cover and the flanges connected thereto.

[0011] As a further optimization solution of the present invention, the sealing member is a rubber gasket.

[0012] As a further optimization solution of the present invention, the fastener is a bolt.

[0013] As a further optimization solution of the present invention, a visual gas pressure gauge is connected to the gas delivery pipeline between the gas isolation valve and the air side casing protective cover.

[0014] As a further optimization solution of the present invention, the gas isolation valve is a ball valve.

[0015] A second aspect of the present invention provides a test device, comprising a multifunctional bushing protective cover as described above and a test measurement reserved interface opened on the surface of the air side bushing protective cover, wherein the test measurement reserved interface is used to connect a high-voltage winding partial discharge test device.

[0016] The beneficial effects of the present invention are as follows: the present invention is provided with an air side casing protection cover and an oil-in-oil casing protection cover, and the two are connected with a lifting seat by arranging a flange plate and a fixing part to form a complete cover body, in which the entire main casing cover is arranged, and the entire device has a simple structure and meets the on-site installation and test requirements of a single-phase 500kV transformer, thereby making the use and detection of the device more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] In the figure: 1. Protective cover inflation device; 2. Gas isolation valve; 3. Visual gas pressure gauge; 4. Air side casing protective cover; 5. Casing pressure equalizing ball; 6. Test measurement reserved interface; 7. Rising seat; 8. Main casing; 9. Oil casing protective cover; 10. Flange. DETAILED DESCRIPTION

[0019] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0020] Embodiment 1

[0021] refer to Figure 1 A multifunctional bushing protection cover comprises an oil-in-bucket bushing protection cover 9 and an air-side bushing protection cover 4, wherein a vertically mounted main bushing 8 (500 kV bushing) is arranged in the oil-in-bucket bushing protection cover 9, and an elevating seat 7 is connected to one end of the oil-in-bucket bushing protection cover 9, and an end of the elevating seat 7 away from the oil-in-bucket bushing protection cover 9 is connected to the air-side bushing protection cover 4;

[0022] The surface of the air side casing protective cover 4 passes through the gas delivery pipeline gas isolation valve 2, and the air inlet end of the gas delivery pipeline is connected to the protective cover inflation device 1;

[0023] One end of the main sleeve 8 located inside the air side sleeve protective cover 4 is connected to a sleeve pressure equalizing ball 5 .

[0024] It should be noted that the riser 7 (also called transformer bracket) is used to support the transformer and keep it at an appropriate height from the ground to ensure normal power supply and safe operation of the transformer. At the same time, the transformer riser is also used to monitor the operating status of the transformer and is an important tool for detecting the cause of transformer failure.

[0025] Furthermore, two groups of flanges 10 are provided on the outer side of the main sleeve 8, and multiple groups of fasteners are provided on the two groups of flanges 10. The two groups of flanges 10 cooperate with the multiple groups of fasteners to respectively connect the oil sleeve protective cover 9 and the lifting seat 7 and the air side sleeve protective cover 4 and the lifting seat 7.

[0026] It should be noted that, in the present invention, the main casing 8 is fixed to the oil-in-casing protective cover 9 through the flange 10 by fasteners, the outer mounting holes of the upper flange 10 of the oil-in-casing protective cover 9 and the lower mounting holes of the lifting seat 7 are fixed by fasteners, and the mounting holes of the lower flange 10 of the air-side casing protective cover 4 and the upper mounting holes of the lifting seat 7 are fixed by fasteners, and in combination with sealing members, the complete sealing of the air side of the 500kV bushing is achieved, and the prerequisites for bushing protection, transportation, testing and nitrogen filling maintenance are met.

[0027] Furthermore, seals are placed between the raised seat 7 and the two groups of flanges 10, between the oil-in-tube protective cover 9 and the flanges 10 connected thereto, and between the air-side tube protective cover 4 and the flanges 10 connected thereto.

[0028] Furthermore, the sealing member is a rubber gasket.

[0029] Furthermore, the fastener is a bolt.

[0030] Furthermore, a visual gas pressure gauge 3 is connected to the gas delivery pipeline between the gas isolation valve 2 and the air side casing protective cover 4.

[0031] It should be noted that when the transformer is used as a standby phase or needs to be stored for a long time, high-purity nitrogen can be filled into the air-side bushing protective cover 4 through the protective cover filling device 1. The pressure in the air-side bushing protective cover 4 can be monitored once every period of time. When it is found that the pressure is too low, dry nitrogen can be injected again to completely isolate the upper terminal of the 500kV bushing from the air, thereby preventing the upper terminal of the 500kV bushing from being corroded, so that the device has a nitrogen filling maintenance function;

[0032] Furthermore, the gas isolation valve 2 is a ball valve.

[0033] Embodiment 2

[0034] An experimental device comprises a multifunctional bushing protective cover as described in the first embodiment and a test measurement reserved interface 6 opened on the surface of the air side bushing protective cover 4, wherein the test measurement reserved interface (6) is used to connect a high voltage winding partial discharge test device.

[0035] It should be noted that when the device needs to be transported, first open the gas isolation valve 2, and fill the air side sleeve protective cover 4 with dry air or nitrogen through the protective cover inflation device 1, and then observe the visual gas pressure gauge 3. When the gas pressure in the air side sleeve protective cover 4 meets the transportation requirements, stop inflation and close the gas isolation valve 2, and then collect gas samples through the test measurement reserved interface 6, and perform purity, pressure and water content tests on the gas in the air side sleeve protective cover 4 to determine whether the gas in the device can meet the transportation requirements.

[0036] It should be further explained that, after the transformer body and the bushing protective cover are installed on site, SF6 gas can be filled into the air-side bushing protective cover 4 through the protective cover inflation device 1, so that the pressure of the SF6 gas in the air-side bushing protective cover 4 reaches 0.5MPa, so as to fully simulate the working environment of the high-voltage bushing (500kV bushing) when the transformer is actually put into operation. At this time, the high-voltage winding partial discharge test can be carried out through the test measurement reserved interface 6.

[0037] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A multifunctional casing protective cover, characterized in that: The invention comprises an oil-inserted casing protection cover (9) and an air-side casing protection cover (4), wherein a vertically mounted main casing (8) is arranged in the oil-inserted casing protection cover (9), one end of the oil-inserted casing protection cover (9) is connected to a lifting seat (7), and the end of the lifting seat (7) away from the oil-inserted casing protection cover (9) is connected to the air-side casing protection cover (4); The surface of the air side casing protective cover (4) passes through a gas transmission pipeline gas isolation valve (2), and the air inlet end of the gas transmission pipeline is connected to a protective cover inflation device (1); One end of the main sleeve (8) located inside the air side sleeve protective cover (4) is connected to a sleeve pressure equalizing ball (5).

2. A multifunctional casing protective cover according to claim 1, characterized in that: The outer side of the main sleeve (8) is provided with two sets of flanges (10), and the two sets of flanges (10) are provided with multiple sets of fasteners. The two sets of flanges (10) cooperate with the multiple sets of fasteners to respectively connect the oil sleeve protective cover (9) and the lifting seat (7) and the air side sleeve protective cover (4) and the lifting seat (7).

3. A multifunctional casing protective cover according to claim 2, characterized in that: Seals are placed between the raised seat (7) and the two sets of flanges (10), between the oil-insulated sleeve protective cover (9) and the flanges (10) connected thereto, and between the air-side sleeve protective cover (4) and the flanges (10) connected thereto.

4. The multifunctional casing protective cover according to claim 3, characterized in that: The sealing element is a rubber gasket.

5. The multifunctional casing protective cover according to claim 2, characterized in that: The fastener is a bolt.

6. The multifunctional casing protective cover according to claim 1, characterized in that: A visual gas pressure gauge (3) is connected to the gas delivery pipeline between the gas isolation valve (2) and the air side casing protective cover (4).

7. The multifunctional casing protective cover according to claim 1, characterized in that: The gas isolation valve (2) is a ball valve.

8. A test device, characterized in that: It comprises a multifunctional bushing protective cover as described in any one of claims 1 to 7, wherein a test measurement reserved interface (6) is provided on the surface of the air side bushing protective cover (4), and the test measurement reserved interface (6) is used to connect a high-voltage winding partial discharge test device.

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