A high-efficiency, multi-functional novel three-switch supporting device and transformer

Abstract

This invention discloses a novel, highly efficient, and multifunctional three-switch support device and transformer, comprising a support frame, with the ends of two second support pipes fixedly connected to a first main pipe and a second main pipe arranged in parallel, respectively. The first support pipe and the first main pipe are respectively located on both sides of the second main pipe, and the two parallel first support pipes are fixedly connected to the second main pipe. A switch intermediate flange is fixedly installed at the upper end of the switch oil chamber of the switch assembly, and the switch head cover is detachably connected to the switch oil chamber through the switch intermediate flange. The support frame of this invention provides effective support and position fixation for the switch assembly through its connection with the transformer body, ensuring sufficient distance between the switch assembly and the oil tank and the transformer body. The detachable support pads also ensure insulation between the switch and the switch support, thereby avoiding the disassembly of the switch support, saving the time required for switch disassembly, and improving the installation efficiency of the transformer.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, specifically to a novel, highly efficient, and multifunctional three-switch support device and transformer. Background Technology

[0002] Transformer switches are the voltage regulating devices of a transformer, playing a role in regulating voltage. Autotransformers, because their high-voltage and medium-voltage coils share a portion of the windings, reduce the amount of material used in the core and coils, thus reducing their size and weight, and significantly lowering manufacturing and transportation costs. Autotransformers are generally used in transformers with voltage levels of 220kV and above. 220kV and 330kV three-phase autotransformers typically use a medium-voltage on-load tap changer. The medium voltage is 110kV. Due to the high voltage, a configuration of three single-phase on-load tap changers is required. The support structure and lead arrangement of these three switches are key considerations in transformer design.

[0003] Existing switch support devices are temporary installation structures, used to support and fix the switch structure when it is not fully installed and fixed on the transformer tank. However, the existing switch support devices are generally too large in size and have a large strength redundancy. After the switch is installed in the tank, the existing switch support devices are also prone to interfering with other transformer components in the tank, affecting the subsequent assembly of the transformer. At the same time, the support connection between the switch support device and the switch can also affect the insulation of the switch. Therefore, the switch support needs to be disassembled. Both the installation and disassembly of the switch support device increase the installation time. In addition, because the switch support device needs to be disassembled, the switch without a support flange structure is generally selected when selecting the switch. The tap selector and the changeover switch need to be disassembled. After the tap selector is installed in the transformer tank, the changeover switch is hoisted from outside the tank into the tank before the switch is connected, which seriously affects the assembly efficiency of the transformer.

[0004] In view of the above-mentioned defects, the inventors of this invention have finally obtained this invention after a long period of research and practice. Summary of the Invention

[0005] To address the aforementioned technical deficiencies, the present invention provides a novel, highly efficient, and multifunctional three-switch support device, comprising a support frame. The support frame includes a first main tube, a second main tube, a first support tube, and a second support tube arranged on the same plane. The two ends of the two second support tubes are respectively fixedly connected to the parallel first main tube and the second main tube. The first support tube and the first main tube are respectively arranged on both sides of the second main tube. The two parallel first support tubes are fixedly connected to the second main tube. The first main tube and the second main tube are separated by the second support tube into symmetrically arranged first and second placement cavities. A third placement cavity is formed between the two first support tubes. The first placement cavity, the second placement cavity, and the third placement cavity are all used to correspondingly place switch assemblies. The switch assembly includes a switch head cover, a switch oil chamber, and a tap selector. The tap selector is fixedly disposed at the lower end of the switch oil chamber. A switch intermediate flange is fixedly disposed at the upper end of the switch oil chamber. The switch head cover is detachably connected to the switch oil chamber through the switch intermediate flange. A support pad is detachably disposed between the switch intermediate flange and the support frame. The first main tube is detachably connected to the transformer body.

[0006] Preferably, the first placement cavity, the second placement cavity, and the third placement cavity are each provided with a first support group and a second support group. The first support group and the second support group are symmetrically arranged, and the first support group and the second support group are respectively fixedly installed on the corresponding first main tube, the second main tube, or the first support tube. The first support group and the second support group are each provided with a connecting hole, and the connecting bolt is detachably connected to the intermediate flange of the switch through the connecting hole.

[0007] Preferably, the first support group includes two symmetrically arranged first support plates, each of which is provided with the connecting hole. The second support group includes a second support plate and a support reinforcing rib plate, the second support plate being provided with the connecting hole. The support reinforcing rib plate is fixedly connected to the second support plate and the second support plate corresponding to the first main tube, the second main tube, or the first support tube.

[0008] Preferably, the support frame further includes a first connecting reinforcing rib plate, which is simultaneously connected to the second support tube and the first main tube or the second main tube corresponding to the end of the second support tube.

[0009] Preferably, the support frame further includes a second connecting reinforcing rib plate, which is connected to both the first support tube and the second main tube.

[0010] Preferably, the first main tube, the second main tube, the first support tube, and the second support tube are all made of square tubes.

[0011] Preferably, two connecting plates are fixedly provided on the side of the first main tube away from the second main tube. The two connecting plates are symmetrically arranged, and the connecting plates and the first main tube are provided with fixing holes. The first fixing bolt connects the transformer clamp and the connecting plate through the corresponding fixing hole, and the second fixing bolt connects the transformer beam and the first main tube through the corresponding fixing hole.

[0012] A transformer includes a novel high-efficiency, multi-functional three-switch support device, a resistor plate support frame, and a resistor plate. The top of the resistor plate support frame is connected to the support frame body. The resistor plate is mounted on the resistor plate support frame and has leads that connect to the corresponding transformer voltage regulating coil.

[0013] Preferably, the device also includes a surge arrester support frame and a surge arrester, wherein the top of the surge arrester support frame is connected to the support frame body, the surge arrester is fixed on the surge arrester support frame, and the surge arrester is provided with a lead wire connected to the corresponding transformer voltage regulating coil.

[0014] Preferably, it also includes an A-phase coil, a B-phase coil, and a C-phase coil arranged sequentially along the direction close to the support frame. The A-phase coil voltage regulating lead, the B-phase coil voltage regulating lead, and the C-phase coil voltage regulating lead are respectively connected to the tap selector corresponding to the switch assembly. The C-phase coil voltage regulating lead is connected to the switch assembly in the third placement cavity.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the support frame of the present invention achieves its own position fixation inside the oil tank by connecting with the transformer body, and at the same time provides effective support and position fixation for the switch assembly through the support pads, ensuring sufficient distance between the switch assembly and the oil tank and the transformer body. The detachable support pads also ensure insulation between the switch and the switch support, thereby avoiding the disassembly of the switch support, saving the time of switch disassembly, and improving the installation efficiency of the transformer. Attached Figure Description

[0016] Figure 1 This is a front view of the structure of the novel, highly efficient, and multifunctional three-switch support device. Figure 2 This is a top view of the structure of the novel, highly efficient, and multifunctional three-switch support device. Figure 3 This is a top view of the transformer structure; Figure 4This is a front view of the internal structure of the transformer; Figure 5 This is a front view of the internal structure of the transformer (without the tap selector); Figure 6 This is a front view of the internal structure of the transformer (with the switch head cover removed). The numbers in the diagram represent: 1-First main tube; 2-Second main tube; 3-First support tube; 4-Second support tube; 5-Second connecting reinforcing rib plate; 6-Connecting plate; 7-First support plate; 8-Second support plate; 9-First connecting reinforcing rib plate; 10-Support reinforcing rib plate; 101-Switch intermediate flange; 102-Resistor plate; 103-Surge arrester; 104-Resistor plate support frame; 105-Surge arrester support frame; 106-Switch head cover; 107-Switch oil chamber; 108-Tap selector; 111-A-phase coil voltage regulating lead; 112-B-phase coil voltage regulating lead; 113-C-phase coil voltage regulating lead; 120-Support frame body; 130-Support pad block. Detailed Implementation

[0017] The above-mentioned and other technical features and advantages of the present invention will be described in more detail below with reference to the accompanying drawings. Example 1

[0018] like Figure 1 and Figure 2 As shown, Figure 1 This is a front view of the structure of the novel, highly efficient, and multifunctional three-switch support device. Figure 2 This is a top view of the structure of the novel, highly efficient, and multifunctional three-switch support device.

[0019] The novel, efficient, and multifunctional three-switch support device of this invention includes a support frame 120. The support frame 120 includes a first main tube 1, a second main tube 2, a first support tube 3, and a second support tube 4 arranged on the same plane. The two ends of the two second support tubes 4 are respectively fixedly connected to the parallel first main tube 1 and the second main tube 2. The first support tube 3 and the first main tube 1 are respectively arranged on both sides of the second main tube 2. The two parallel first support tubes 3 are fixedly connected to the second main tube 2. The first main tube 1 and the second main tube 2 are separated by the second support tubes 4 into symmetrically arranged first placement chambers and second placement chambers. A third placement cavity is formed between the first support tubes 3. The first placement cavity, the second placement cavity, and the third placement cavity are all used to place the switch assembly. The switch assembly includes a switch head cover 106, a switch oil chamber 107, and a tap selector 108. The tap selector 108 is fixedly installed at the lower end of the switch oil chamber 107. A switch intermediate flange 101 is fixedly installed at the upper end of the switch oil chamber 107. The switch head cover 106 is detachably connected to the switch oil chamber 107 through the switch intermediate flange 101. A support pad 130 is detachably installed between the switch intermediate flange 101 and the support frame 120. The first main tube 1 is detachably connected to the transformer body.

[0020] Preferably, the first placement cavity, the second placement cavity, and the third placement cavity are each provided with a first support group and a second support group. The first support group and the second support group are symmetrically arranged and are respectively fixedly mounted on the corresponding first main tube 1, second main tube 2, or first support tube 3. Both the first support group and the second support group are provided with connecting holes, and connecting bolts are detachably connected to the switch intermediate flange 101 through the connecting holes, thereby realizing the support and fixation of the switch oil chamber 107 and the tap selector 108 by the present invention.

[0021] Preferably, the support pad 130 is disposed between the switch intermediate flange 101 and the corresponding first support group and second support group. Before the transformer body and the switch oil chamber 107 are placed into the transformer oil tank, the switch head cover 106 is removed. The switch oil chamber 107 is supported by the switch intermediate flange 101. The support pad 130 is placed between the switch intermediate flange 101 and the switch support. After the transformer body is placed into the oil tank, the switch head cover 106 is connected to the switch intermediate flange 101, and then the support pad 130 is removed to ensure insulation between the switch and the switch support. This installation method improves the installation efficiency of the transformer and the reliability of the switch insulation.

[0022] Generally, the first support group includes two symmetrically arranged first support plates 7, each with a connecting hole. The second support group includes a second support plate 8 and a supporting reinforcing rib plate 10. The second support plate 8 has the connecting hole, and the supporting reinforcing rib plate 10 is fixedly connected to both the second support plate 8 and the corresponding first main tube 1, second main tube 2, or first support tube 3 to improve the structural strength of the second support plate 8. Since the second support plate 8 bears the weight of the switch, the supporting reinforcing rib plate 10 is welded to the bottom of the second support plate 8 to ensure support strength.

[0023] The upper surfaces of the first support plate 7 and the second support plate 8 on the corresponding first support group and second support group are arranged on the same horizontal plane to ensure that the switch assembly is not tilted when it is supported.

[0024] Preferably, the support frame 120 further includes a first connecting reinforcing rib plate 9, which is simultaneously connected to the second support pipe 4 and the first main pipe 1 or the second main pipe 2 corresponding to the end of the second support pipe 4, to reinforce the strength and improve the overall structural strength.

[0025] The support frame 120 also includes a second connecting reinforcing rib plate 5, which is connected to both the first support tube 3 and the second main tube 2 to reinforce the strength and improve the overall structural strength.

[0026] Preferably, the first main tube 1, the second main tube 2, the first support tube 3 and the second support tube 4 are all made of square tube structure. Square tubes have higher bending stiffness and better torsional performance. Under the premise of satisfying both, the weight will also be lighter, reducing the impact of the present invention on the transformer.

[0027] Preferably, two connecting plates 6 are fixedly provided on the side of the first main tube 1 away from the second main tube 2. The two connecting plates 6 are symmetrically arranged, and the connecting plates 6 and the first main tube 1 are provided with fixing holes. The first fixing bolt connects the transformer clamp and the connecting plate 6 through the corresponding fixing hole, and the second fixing bolt connects the transformer crossbeam and the first main tube 1 through the corresponding fixing hole, so as to realize the position fixation of the present invention in the transformer tank.

[0028] By changing the arrangement of the three switch assemblies from an inverted triangular structure to a regular triangular structure, the structure of the three switch assemblies is modified. One switch is positioned further away from the transformer body, while two switches are positioned closer to the transformer body. This reduction in the number of switches at the far end reduces the load on the switch supports, making it easier to meet strength requirements and allowing for a smaller, more compact design. Simultaneously, the regular triangular arrangement increases the space between the head and the oil tank, facilitating personnel access for switch inspection.

[0029] The support frame 120 of this invention, through its connection with the transformer body, achieves its fixed position inside the oil tank. Simultaneously, the support pad 130 provides effective support and positional fixation for the switch assembly, ensuring sufficient distance between the switch assembly and the oil tank and transformer body. The detachable support pad 130 also ensures insulation between the switch and the switch support, thus avoiding the need to disassemble the switch support, saving time and improving transformer installation efficiency. Furthermore, the switch assembly adopts a structure with a support flange. When the transformer body is installed, only the top cover of the support flange needs to be removed, and the top cover can be installed outside the oil tank. There is no need to separate and disassemble the switch switching mechanism and tap selector 108, further improving transformer installation efficiency. Example 2

[0030] like Figures 3 to 6 As shown, Figure 3 This is a top view of the transformer structure; Figure 4 This is a front view of the internal structure of the transformer; Figure 5 This is a front view of the internal structure of the transformer (without the tap selector); Figure 6 This is a front view of the internal structure of the transformer (with the switch head cover removed).

[0031] The transformer of the present invention includes a novel high-efficiency, multi-functional three-switch support device, a resistor plate support frame 104, and a resistor plate 102. The top of the resistor plate support frame 104 is connected to the support frame body 120. The resistor plate 102 is disposed on the resistor plate support frame 104. The resistor plate 102 is provided with leads that are connected to the corresponding transformer voltage regulating coil, thereby limiting the current during switch switching.

[0032] The transformer of the present invention further includes a surge arrester support frame 105 and a surge arrester 103. The top of the surge arrester support frame 105 is connected to the support frame body 120. The surge arrester 103 is fixed on the surge arrester support frame 105. The surge arrester 103 is provided with a lead wire connected to the corresponding transformer voltage regulating coil, which plays a role in protecting the voltage regulating winding under impulse voltage.

[0033] To limit the circulating current during switching of the on-load tap changer of the transformer, a resistor plate 102 with a current-limiting resistor needs to be installed. The existing current-limiting resistor is usually placed at the bottom of the switch, but when the transformer is not tall enough, it needs to be installed on the oil tank. When the current-limiting resistor needs to be installed on the oil tank, a person needs to enter the oil tank to install and connect the wires, which affects the installation efficiency.

[0034] To protect the interlayer insulation of the transformer regulating coil under lightning and operational shock conditions, a surge arrester 103 needs to be installed on the regulating coil. This surge arrester 103 is located near the switch and is usually fixed on the oil tank. It requires personnel to enter the oil tank for installation and wiring, which affects the installation efficiency.

[0035] This invention avoids the original solution of welding a separate support base on the oil tank by setting up the surge arrester support frame and the resistor plate support frame. It also avoids the need for workers to enter the oil tank to wire the surge arrester 103 and the resistor plate 102 after the transformer body is installed. The switch support is also kept inside the transformer and does not need to be disassembled, which improves the efficiency of transformer installation and reduces the time that the transformer body insulation components are exposed to the air. Example 3

[0036] The transformer of the present invention further includes an A-phase coil, a B-phase coil, and a C-phase coil arranged sequentially along the direction close to the support frame 120. The A-phase coil voltage regulating lead 111, the B-phase coil voltage regulating lead 112, and the C-phase coil voltage regulating lead 113 led from the A-phase coil are respectively connected to the tap selector 108 corresponding to the switching assembly. The C-phase coil voltage regulating lead 113 is connected to the switching assembly in the third placement cavity. This method increases the length of the C-phase coil voltage regulating lead 113, thereby reducing the length difference of the three-phase leads and making it easier for the three-phase resistance imbalance rate to meet the requirements of relevant standards.

[0037] The above are merely preferred embodiments of the present invention and are illustrative in nature, not restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, all of which will fall within the protection scope of the present invention.

Claims

1. A novel, highly efficient, and multifunctional three-switch support device, characterized in that, The system includes a support frame comprising a first main tube, a second main tube, a first support tube, and a second support tube arranged on the same plane. The two ends of the two second support tubes are respectively fixedly connected to the parallel first main tube and the second main tube. The first support tube and the first main tube are respectively arranged on both sides of the second main tube. The two parallel first support tubes are fixedly connected to the second main tube. The first main tube and the second main tube are separated by the second support tube into symmetrically arranged first and second placement cavities. A third placement cavity is formed between the two first support tubes. The first, second, and third placement cavities are all used to correspondingly place switch assemblies. The switch assembly includes a switch head cover, a switch oil chamber, and a tap selector. The tap selector is fixedly arranged at the lower end of the switch oil chamber. A switch intermediate flange is fixedly arranged at the upper end of the switch oil chamber. The switch head cover is detachably connected to the switch oil chamber through the switch intermediate flange. A support pad is detachably arranged between the switch intermediate flange and the support frame. The first main tube is detachably connected to the transformer body.

2. The high efficiency, multi-functional novel triple-switch support device of claim 1, wherein, The first placement cavity, the second placement cavity, and the third placement cavity are each provided with a first support group and a second support group. The first support group and the second support group are symmetrically arranged, and the first support group and the second support group are respectively fixedly installed on the corresponding first main tube, the second main tube, or the first support tube. The first support group and the second support group are each provided with a connecting hole, and the connecting bolt is detachably connected to the intermediate flange of the switch through the connecting hole.

3. The high efficiency, multi-functional novel triple-switch support device of claim 2, wherein, The first support group includes two symmetrically arranged first support plates, each of which is provided with the connecting hole. The second support group includes a second support plate and a support reinforcing rib plate, the second support plate being provided with the connecting hole. The support reinforcing rib plate is fixedly connected to the second support plate and the second support plate corresponding to the first main tube, the second main tube, or the first support tube.

4. The high efficiency, multi-functional novel triple-switch support device of claim 1, wherein, The support frame also includes a first connecting reinforcing rib plate, which is simultaneously connected to the second support pipe and the first main pipe or the second main pipe corresponding to the end of the second support pipe.

5. The high efficiency, multi-functional novel triple-switch support device of claim 1, wherein, The support frame also includes a second connecting reinforcing rib plate, which is connected to both the first support tube and the second main tube.

6. The high efficiency, multi-functional novel triple-switch support device of claim 1, wherein, The first main tube, the second main tube, the first support tube, and the second support tube are all made of square tubes.

7. The novel high-efficiency, multi-functional three-switch support device as described in claim 1, characterized in that, Two connecting plates are fixedly installed on the side of the first main tube away from the second main tube. The two connecting plates are symmetrically arranged, and the connecting plates and the first main tube are provided with fixing holes. The first fixing bolt connects the transformer clamp and the connecting plate through the corresponding fixing hole, and the second fixing bolt connects the transformer beam and the first main tube through the corresponding fixing hole.

8. A transformer, characterized by The invention includes a novel, highly efficient, multifunctional three-switch support device, a resistor plate support frame, and a resistor plate, as described in any one of claims 1-7. The top of the resistor plate support frame is connected to the support frame body, the resistor plate is disposed on the resistor plate support frame, and the resistor plate is provided with leads that are connected to the corresponding transformer voltage regulating coil.

9. The transformer of claim 8, wherein, It also includes a surge arrester support frame and a surge arrester. The top of the surge arrester support frame is connected to the support frame body, and the surge arrester is fixed on the surge arrester support frame. The surge arrester is provided with a lead wire that is connected to the corresponding transformer voltage regulating coil.

10. The transformer of claim 9, wherein, It also includes an A-phase coil, a B-phase coil, and a C-phase coil arranged sequentially along the direction close to the support frame. The voltage regulating leads of the A-phase coil, the B-phase coil, and the C-phase coil are respectively connected to the tap selectors corresponding to the switching components. The voltage regulating lead of the C-phase coil is connected to the switching components in the third placement cavity.

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