Totally-enclosed insulating transformer and on-site unified test tool
By using a fully enclosed insulated transformer and unified on-site testing fixtures, the problems of numerous materials and long testing times for transformers and high-voltage switches are solved, achieving efficient and compact testing connections and quality assurance, and making it suitable for flexible applications in multiple scenarios.
Patent Information
- Application Number
- CN202422614822.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2034-10-29
AI Technical Summary
In the existing technology, field testing of transformers and high-voltage switches requires the preparation of a large amount of test materials and consumes a lot of time and energy. In addition, it is affected by external environmental factors, occupies a large space, and is difficult to arrange compactly.
This invention provides a fully enclosed insulated transformer and a unified field testing fixture. By combining a high-voltage test bushing, a neutral grounding bushing, and a low-voltage test bushing, a shared testing device for fully enclosed insulated transformers and GIS equipment is achieved. The device adopts a detachable snap-fit flange structure and positioning frame to simplify the connection process.
It reduces the need for test preparation materials, saves time, improves connection efficiency, ensures test quality, and is suitable for flexible disassembly and reuse in different scenarios.
Smart Images
Figure CN223796629U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of high voltage equipment technology, and more specifically, to a fully enclosed insulated transformer and a unified on-site testing fixture. Background Technology
[0002] Currently, the most common form of on-site handover testing in substations is to conduct separate tests on the transformer and high-voltage switch.
[0003] For substations employing air insulation technology, on-site transformer or GIS equipment testing requires connecting the transformer or high-voltage switch to the testing equipment via an open connection structure. Air serves as the insulating medium between the testing equipment and the transformer, and between the testing equipment and the high-voltage switch. This open-type air insulation technology is susceptible to external environmental factors such as humidity and altitude, and requires maintaining a safe distance according to the regulations for the corresponding voltage level during operation. Ensuring safe insulation distances generally necessitates a significant amount of land, which is unsuitable for urban substations and substations in areas with scarce land resources.
[0004] In addition, under the air-insulated connection method, the existing outdoor high-voltage substation transformer and GIS equipment need to be set to separate phase connection. The circuit connection structure needs to reserve sufficient insulation distance and cannot be arranged compactly, thus wasting a lot of installation space.
[0005] For transformers using oil-sulfur hexafluoride (SF6) gas bushings, the bushing structure is relatively closed and cannot be adjusted. Therefore, existing SF6 gas-insulated transformer equipment cannot be directly tested on oil-SF6 gas bushings. During testing, a transitional test device with an oil-air bushing needs to be added to the existing transformer equipment structure to achieve the electrical connection of the test equipment.
[0006] In traditional solutions, if an oil-SF6 transformer and GIS equipment are connected, different testing fixtures must be connected to each device separately for testing. Only after testing the transformer and the GIS equipment separately can the connection and installation between the two devices proceed. Because significant effort is spent on equipment testing before installation, existing technologies struggle to ensure connection quality during installation and to accurately and effectively test and assess the validity of the connection positions.
[0007] Therefore, regardless of the connection technology used, under current methods, a large amount of test materials and a significant amount of time and effort are required when testing transformers on-site. Utility Model Content
[0008] The present invention provides a fully enclosed insulated transformer and a unified on-site testing fixture. The problem to be solved is that, regardless of the connection technology used in existing transformers and high-voltage switches, a large amount of test materials and a lot of time and effort are required when the transformer is tested on-site.
[0009] To achieve the above objectives, this utility model provides the following technical solution: a fully enclosed insulated transformer and a unified on-site testing fixture, including a fully enclosed insulated transformer, a neutral point grounding device, and a GIS device. The fully enclosed insulated transformer is provided with a low-voltage terminal, and a low-voltage test bushing is installed on the low-voltage output terminal. A neutral point grounding bushing is installed on the terminal of the neutral point grounding device. The GIS device is located on one side of the neutral point grounding device. A test riser is installed on the terminal of the GIS device, and a high-voltage test bushing is installed on the test riser. A final screen tap is provided on the high-voltage test bushing, the neutral point grounding bushing, and the low-voltage test bushing. The final screen tap is used to perform partial discharge detection on the fully enclosed insulated transformer and the GIS device.
[0010] The high-voltage test bushing, the neutral point grounding bushing, and the low-voltage test bushing are all fixedly installed with a first flange at the end away from the fully enclosed insulated transformer. A second flange is fixedly installed on the incoming line end. Multiple positioning frames are detachably snapped onto the outside of the first and second flanges. Positioning plates are installed on the positioning frames. When the positioning plates are in contact with the surface of the second flange, the first and second flanges are fixedly connected.
[0011] In a preferred embodiment, a screw is rotatably connected to the side of the positioning plate away from the second flange. A fixing plate is threaded onto the external side of the screw. The fixing plate is fixedly installed on the positioning frame. One side of the positioning plate is slidably connected to the surface of the positioning frame. When the screw rotates, the positioning plate moves relative to the second flange.
[0012] In a preferred embodiment, a plurality of guide rods are slidably sleeved inside the fixing plate, the guide rods are connected to the surface of the positioning plate, and the surface of the guide rods is provided with scale.
[0013] In a preferred embodiment, a guide cylinder is fixedly installed on the side of the first flange facing the second flange. The guide cylinder is sleeved outside the second flange. Multiple fixing blocks are fixedly installed on the first flange. Multiple limiting holes are opened on the second flange. The fixing blocks are located inside the limiting holes.
[0014] In a preferred embodiment, the top of the positioning frame is rotatably connected to the surface of the first flange.
[0015] In a preferred embodiment, when the fully enclosed insulated transformer is directly connected to the GIS equipment, the fully enclosed insulated transformer is pressurized or short-circuited for testing through a high-voltage test bushing, a neutral point grounding bushing, and a low-voltage test bushing.
[0016] In a preferred embodiment, the high-voltage test bushing, the neutral grounding bushing, and the low-voltage test bushing are connected to the inlet and outlet interfaces of the fully enclosed insulated transformer using a finger-plug-in connection.
[0017] The beneficial effects of this utility model are as follows:
[0018] 1. This utility model sets up a single test device for GIS equipment and fully enclosed insulated transformers to meet the on-site testing requirements of fully enclosed insulated transformers and GIS equipment, reducing the materials required for on-site testing of fully enclosed insulated transformers and GIS equipment. Compared with conventional methods, it reduces the amount of resources required for testing and saves a lot of test preparation time.
[0019] 2. This utility model can also be provided as an independent module for use in substations. After completing the field test, it can always be kept running on the equipment, or it can be flexibly disassembled and used for field testing of other products according to the needs of the usage scenario. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall structure of the GIS equipment and neutral grounding equipment of this utility model.
[0021] Figure 2 This is a schematic diagram of the fully enclosed insulated transformer structure of this utility model.
[0022] Figure 3 This is a schematic diagram of the neutral point AC withstand voltage test structure of this utility model.
[0023] Figure 4 This is a schematic diagram of the low-voltage AC withstand voltage test structure of this utility model.
[0024] Figure 5 This is a schematic diagram of the partial discharge measurement structure of the long-term induced withstand voltage test band of the present invention, which includes the winding and bushing.
[0025] Figure 6 This is a schematic diagram of the short-circuit impedance and load loss measurement structure of this utility model.
[0026] Figure 7 This is a schematic diagram of the zero-sequence impedance measurement structure of this utility model.
[0027] Figure 8 This is a schematic diagram of the first flange installation structure of this utility model.
[0028] Figure 9 This is a schematic diagram of the cross-sectional structure of the first flange of this utility model.
[0029] Figure 10 This utility model Figure 9 Enlarged view of the structure of section A in the middle.
[0030] The attached figures are labeled as follows: 1. High-voltage test bushing; 11. End screen tap; 2. Test riser; 3. Neutral grounding bushing; 4. Low-voltage test bushing; 5. First flange; 51. Guide cylinder; 52. Fixing block; 6. Second flange; 61. Limiting hole; 7. Positioning frame; 71. Fixing plate; 72. Positioning plate; 73. Guide rod; 74. Screw; 8. GIS equipment; 9. Neutral grounding equipment; 10. Fully enclosed insulated transformer. Detailed Implementation
[0031] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.
[0032] Refer to the instruction manual appendix Figures 1 to 10 A fully enclosed insulated transformer and field unified testing fixture includes a fully enclosed insulated transformer 10, a neutral point grounding device 9, and a GIS device 8. The fully enclosed insulated transformer 10 is equipped with a low-voltage terminal, and a low-voltage test bushing 4 is installed on the low-voltage output terminal. The terminal of the neutral point grounding device 9 is equipped with a neutral point grounding bushing 3. The GIS device 8 is located on one side of the neutral point grounding device 9. The terminal of the GIS device 8 is equipped with a test riser 2, and a high-voltage test bushing 1 is installed on the test riser 2. The high-voltage test bushing 1, the neutral point grounding bushing 3, and the low-voltage test bushing 4 are all equipped with end-screen taps 11. The end-screen taps 11 are used to perform partial discharge detection on the fully enclosed insulated transformer 10 and the GIS device 8.
[0033] The high-voltage test bushing 1, the neutral point grounding bushing 3, and the low-voltage test bushing 4 are all fixedly installed with a first flange 5 at the end away from the fully enclosed insulated transformer 10. A second flange 6 is fixedly installed on the inlet end. Multiple positioning frames 7 are detachably snapped together on the outside of the first flange 5 and the second flange 6. Positioning plates 72 are installed on the positioning frames 7. When the positioning plates 72 are in contact with the surface of the second flange 6, the first flange 5 and the second flange 6 are fixedly connected.
[0034] It should be noted that external leads are connected to the high-voltage test bushing 1, neutral point grounding bushing 3, and low-voltage test bushing 4 to test the fully enclosed insulated transformer 10 and GIS equipment 8. Alternatively, some of the fully enclosed insulated transformer 10 can be tested separately. When testing some of the fully enclosed insulated transformer 10 separately, the disconnecting switch at the connection between the fully enclosed insulated transformer 10 and the GIS equipment 8 should be disconnected before testing.
[0035] The specific implementation method of this device is as follows:
[0036] 1. After the fully enclosed insulated transformer 10 and GIS equipment 8 are installed on site, the test riser 2 and high voltage test bushing 1 are installed at the inlet of GIS equipment 8, the neutral point grounding bushing 3 is installed on the neutral point grounding equipment 9, and the low voltage test bushing 4 is installed at the low voltage connection of the fully enclosed insulated transformer 10.
[0037] 2. Adjust the disconnect switch at the connection between the fully enclosed insulated transformer 10 and the GIS equipment 8 to the conducting state, and apply pressure to the high-voltage test bushing 1 to conduct a partial test of the fully enclosed insulated transformer 10 and the GIS equipment 8.
[0038] 3. Adjust the isolating switch at the connection between the fully enclosed insulated transformer 10 and the GIS equipment 8 to the closed state, and carry out the remaining relevant handover test items of the GIS equipment 8 on the high-voltage test bushing 1.
[0039] 4. Adjust the disconnect switch at the connection between the fully enclosed insulated transformer 10 and the GIS equipment 8 to the closed state, and conduct relevant handover tests on the neutral point grounding equipment on the neutral point grounding bushing 3.
[0040] 5. Adjust the disconnect switch at the connection between the fully enclosed insulated transformer 10 and the GIS equipment 8 to the closed state, and carry out the remaining relevant handover tests of the transformer on the neutral point grounding bushing 3 and the low voltage test bushing 4.
[0041] 6. After the test, remove the test riser 2, neutral grounding bushing 3 and low-voltage test bushing 4. The removed test equipment can be used for on-site handover tests of other projects, realizing that only one assembly and disassembly of the test fixture is required, which can reduce a lot of on-site test preparation time and effort.
[0042] When the high-voltage test bushing 1, the neutral point grounding bushing 3, and the low-voltage test bushing 4 are connected to the second flange 6 through the first flange 5, the positioning frame 7 is snapped onto the outside of the first flange 5 and the second flange 6. Adjusting the positioning plate 72 to contact the second flange 6 can adjust the tightness of the connection between the first flange 5 and the second flange 6.
[0043] Furthermore, a screw 74 is rotatably connected to the side of the positioning plate 72 away from the second flange 6. A fixing plate 71 is threaded onto the outside of the screw 74. The fixing plate 71 is fixedly installed on the positioning frame 7. One side of the positioning plate 72 is slidably connected to the surface of the positioning frame 7. When the screw 74 rotates, the positioning plate 72 moves relative to it.
[0044] In the above embodiment, rotating the screw 74 can adjust the positioning plate 72 to move relative to the outside of the second flange 6, so that when the positioning plate 72 contacts the second flange 6, the second flange 6 and the first flange 5 can be fixedly connected. Furthermore, by increasing the contact area between the screw 74 and the surface of the second flange 6 through the positioning plate 72, the efficiency of the connection between the first flange 5 and the second flange 6 can be improved.
[0045] Furthermore, a plurality of guide rods 73 are slidably sleeved inside the fixing plate 71. The guide rods 73 are connected to the surface of the positioning plate 72, and the surface of the guide rods 73 is provided with scale.
[0046] In the above embodiment, the guide rod 73 is slidably connected to the fixed plate 71 to improve the stability of the positioning plate 72 when it moves, and by observing the scale, the contact between the first flange 5 and the second flange 6 can be made uniform.
[0047] Furthermore, a guide cylinder 51 is fixedly installed on the side of the first flange 5 facing the second flange 6. The guide cylinder 51 is sleeved on the outside of the second flange 6. Multiple fixing blocks 52 are fixedly installed on the first flange 5. Multiple limiting holes 61 are opened on the second flange 6. The fixing blocks 52 are located inside the limiting holes 61.
[0048] In the above embodiment, by aligning the fixing block 52 with the second flange 6 and the fixing block 52 with the limiting hole 61, the first flange 5 and the second flange 6 can be quickly and accurately connected, reducing the difficulty of alignment during installation and improving installation efficiency.
[0049] Furthermore, the top of the positioning frame 7 is rotatably connected to the surface of the first flange 5.
[0050] In the above embodiment, the positioning bracket 7 can quickly contact the second flange 6 when pressed down, thus improving installation efficiency.
[0051] Furthermore, when the fully enclosed insulated transformer 10 is directly connected to the GIS equipment 8, the fully enclosed insulated transformer 10 is tested by applying pressure or short-circuiting through the high-voltage test bushing 1, the neutral point grounding bushing 3, and the low-voltage test bushing 4.
[0052] In the above embodiments, the insulation performance of the equipment can be tested when pressure is applied to ensure that the equipment can work normally under the rated voltage or higher voltage, and the short-circuit performance of the equipment can be tested when short-circuit is applied to ensure that the equipment can quickly cut off the current under short-circuit conditions.
[0053] Furthermore, the high-voltage test bushing 1, the neutral grounding bushing 3, and the low-voltage test bushing 4 are connected to the inlet and outlet interfaces of the fully enclosed insulated transformer 10 by a finger-plug type connection.
[0054] Working Principle: When using this device, first, after installing the fully enclosed insulated transformer 10 and GIS equipment 8 at the test site, install the test riser 2 and high-voltage test bushing 1 at the inlet of GIS equipment 8, install the neutral point grounding bushing 3 on the neutral point grounding equipment 9, and install the low-voltage test bushing 4 at the low-voltage connection of the fully enclosed insulated transformer 10. Connect the high-voltage test bushing 1, neutral point grounding bushing 3, and low-voltage test bushing 4 to the inlet and outlet lines of the fully enclosed insulated transformer 10 to perform the test. When the first flange 5 and the second flange 6 are connected, press the positioning frame 7 downwards to engage it with the first flange 5. The outer side of flange 5 and second flange 6 is then rotated. The positioning plate 72 can be adjusted to move relative to the outer side of the second flange 6 by rotating the screw 74. When the positioning plate 72 contacts the second flange 6, the second flange 6 and the first flange 5 can be fixedly connected. The positioning plate 72 increases the contact area between the screw 74 and the surface of the second flange 6, which can improve the connection efficiency of the first flange 5 and the second flange 6. Adjusting the contact between the positioning plate 72 and the second flange 6 adjusts the tightness of the connection between the first flange 5 and the second flange 6, so that the high-voltage test bushing 1, the neutral point grounding bushing 3 and the low-voltage test bushing 4 can be installed quickly, reducing on-site preparation time and effort.
[0055] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.
Claims
1. A fully enclosed insulated transformer and field unified testing fixture, comprising a fully enclosed insulated transformer (10), a neutral point grounding device (9), and a GIS device (8), characterized in that: The fully enclosed insulated transformer (10) is provided with a low-voltage terminal, and a low-voltage test bushing (4) is installed on the low-voltage terminal. The neutral point grounding device (9) is provided with a neutral point grounding bushing (3) at its terminal. The GIS device (8) is located on one side of the neutral point grounding device (9). The GIS device (8) is provided with a test riser (2) at its terminal. A high-voltage test bushing (1) is installed on the test riser (2). The high-voltage test bushing (1), the neutral point grounding bushing (3), and the low-voltage test bushing (4) are all provided with end-screen taps (11). The end-screen taps (11) are used to perform partial discharge detection on the fully enclosed insulated transformer (10) and the GIS device (8). The high-voltage test bushing (1), the neutral point grounding bushing (3), and the low-voltage test bushing (4) are all fixedly installed with a first flange (5) at the end away from the fully enclosed insulated transformer (10). The high-voltage test bushing (1), the neutral point grounding bushing (3), and the low-voltage test bushing (4) are fixedly installed with a second flange (6). The first flange (5) and the second flange (6) are detachably snapped together with multiple positioning frames (7). The positioning frame (7) is equipped with a positioning plate (72). When the positioning plate (72) contacts the surface of the second flange (6), the first flange (5) and the second flange (6) are fixedly connected.
2. The fully enclosed insulated transformer and unified field testing fixture according to claim 1, characterized in that: The positioning plate (72) is rotatably connected to a screw (74) on the side away from the second flange (6). The screw (74) is threaded with a fixing plate (71). The fixing plate (71) is fixedly installed on the positioning frame (7). One side of the positioning plate (72) is slidably connected to the surface of the positioning frame (7). When the screw (74) rotates, the positioning plate (72) moves relative to it.
3. The fully enclosed insulated transformer and unified field testing fixture according to claim 2, characterized in that: Multiple guide rods (73) are slidably sleeved inside the fixing plate (71). The guide rods (73) are connected to the surface of the positioning plate (72), and the surface of the guide rods (73) is provided with scale.
4. The fully enclosed insulated transformer and unified field testing fixture according to claim 3, characterized in that: A guide cylinder (51) is fixedly installed on the side of the first flange (5) facing the second flange (6). The guide cylinder (51) is sleeved on the outside of the second flange (6). A plurality of fixing blocks (52) are fixedly installed on the first flange (5). A plurality of limiting holes (61) are opened on the second flange (6). The fixing blocks (52) are located inside the limiting holes (61).
5. The fully enclosed insulated transformer and unified field testing fixture according to claim 4, characterized in that: The top of the positioning frame (7) is rotatably connected to the surface of the first flange (5).
6. The fully enclosed insulated transformer and unified field testing fixture according to claim 5, characterized in that: When the fully enclosed insulated transformer (10) is directly connected to the GIS equipment (8), the fully enclosed insulated transformer (10) is pressurized or short-circuited for testing through the high voltage test bushing (1), the neutral point grounding bushing (3) and the low voltage test bushing (4).
7. The fully enclosed insulated transformer and unified field testing fixture according to claim 6, characterized in that: The high-voltage test bushing (1), neutral point grounding bushing (3) and low-voltage test bushing (4) are connected to the inlet and outlet interfaces of the fully enclosed insulated transformer (10) by a finger-plug type connection.