Transformer voltage regulating winding connection lead-out structure and installation method

Abstract

This invention relates to a transformer voltage regulating winding connection lead-out structure and installation method, including a voltage regulating winding and a connecting rod. The voltage regulating winding is divided into upper and lower parts, with multiple upper voltage regulating winding leads radially from the upper part and multiple lower voltage regulating winding leads radially from the lower part. The upper end of the connecting rod connects to the corresponding upper voltage regulating winding lead-out, and the lower end connects to the corresponding lower voltage regulating winding lead-out. The outer side of the connecting rod is first wrapped with an insulating layer, and then binding pads are placed between adjacent connecting rods. The binding pads are fixed by binding with fixing straps. The connecting rod has a lead-out connection end. This invention connects the upper and lower parallel voltage regulating windings with connecting rods, reducing the difficulty of processing and operation. At the same time, the entire winding is fixed with copper rods, which improves the short-circuit withstand capability of the winding. Furthermore, this invention is applicable to voltage regulating windings of various structures and reactance heights, making it highly adaptable.

Description

Technical Field

[0001] This invention relates to the field of transformers, specifically to a transformer voltage regulating winding connection lead-out structure and installation method. Background Technology

[0002] With the development of transformers, the number of taps of on-load tap changers used in power grid systems is increasing. For example, domestic converter transformers are basically ±15 taps, while transformers in North America are also ±15 taps or more. Transformers with many voltage regulating taps and large winding currents are characterized by numerous voltage regulating winding leads and thick cables. Furthermore, the leads connecting the tap changer are usually divided into upper and lower parts, which converge at the switch. This makes the voltage regulating lead structure in the existing technology very complex and inconvenient to install and connect. Moreover, due to the large number of leads, it is easy to cause incorrect connection between the winding and the switch tap. In addition, when the leads are routed through the upper and lower clamps, it can cause local overheating of the upper and lower metal structural components, which can easily lead to transformer failure during testing.

[0003] Patent CN110415947A discloses a high-current shunt voltage regulating winding and its processing method. It includes two voltage regulating coils wound in opposite directions. The voltage regulating coils are single-layer coils, with each coil's output extending radially along the coil axis, evenly distributed, and offset vertically at the same angle. However, this winding structure requires the addition of support strips to the outside of the voltage regulating coils and binding them with paper tape. Specifically, the paper tape binds the voltage regulating coils to the outer support strips as a single unit. The paper tape binding is symmetrically distributed along the axis of the voltage regulating coil every other set of outputs. The number of outer support strips depends on the number of taps in the voltage regulating winding. The outer support strips are tightly attached to the outside of the voltage regulating coil, working together with the paper tape to secure the coil. The length of the outer support strips depends on the reactance height of the voltage regulating coil. However, this method, for a novel coil structure, has very limited applicability.

[0004] CN114171303B patent discloses a voltage regulating routing structure for a transformer winding, which includes a winding, voltage regulating taps, oil passages, and a voltage regulating mechanism. Taps extending outwards are provided on the winding on both sides of the oil passages, and each tap connects to a different position on the winding. This allows adjustment of the number of turns in the winding through different tap connections. A voltage regulating mechanism is provided between the multiple taps. The voltage regulating mechanism includes an automatic voltage regulating component and a manual voltage regulating component. The manual voltage regulating component includes two sets of connecting joints, a rotary adjusting knob, and a lifting connecting module. The block and fixed plate, the automatic voltage regulating component includes an adjusting wheel and a pressing component. Each rotary adjusting button has a corresponding adjusting wheel on one side and the adjusting wheel and the rotary adjusting knob are engaged with each other. Each adjusting wheel is connected to a stepper motor and the two stepper motors are connected to the Internet of Things. An elastic telescopic component is set between the two rotary adjusting knobs. This structure is relatively complex and requires the configuration of adjusting wheels, stepper motors and other devices. In addition, this patent is not for the connection method of the winding head, and from the structure, it is a no-load voltage regulating method, mainly for low voltage small power distribution. Summary of the Invention

[0005] The purpose of this invention is to provide a transformer voltage regulating winding connection lead-out structure and installation method, which connects the upper and lower parallel voltage regulating windings through connecting rods (copper rods). This structure eliminates the need to use wooden parts such as support bars to fix the copper busbars, reducing the difficulty of processing and operation. At the same time, the entire winding is fixed with copper rods, which improves the winding's short-circuit withstand capability. Furthermore, this invention is applicable to voltage regulating windings of various structures (such as spiral type, disc type, etc.) and reactance heights, making it highly adaptable.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A transformer voltage regulating winding connection lead-out structure includes a voltage regulating winding and a connecting rod. The voltage regulating winding is divided into upper and lower parts, with multiple upper voltage regulating winding leads radially from the upper part and multiple lower voltage regulating winding leads radially from the lower part. The upper end of the connecting rod is connected to the corresponding upper voltage regulating winding lead-out, and the lower end is connected to the corresponding lower voltage regulating winding lead-out. The outer side of the connecting rod is first wrapped with an insulating layer, and then binding pads are set between adjacent connecting rods. The binding pads are fixed by binding with binding straps. The connecting rod is provided with a lead-out connection end.

[0008] Both the upper and lower ends of the connecting rod are sleeve structures, and the upper and lower leads of the voltage regulating winding are threadedly installed in the corresponding sleeves.

[0009] The connecting rod is equipped with a surge arrester lead connection terminal.

[0010] Both the outgoing lead connection terminal and the surge arrester lead connection terminal are connecting sleeve structures.

[0011] The binding pad has slots on both sides for engaging and positioning with the connecting rod.

[0012] The lead wire connection ends on each connecting rod are set at different heights.

[0013] An installation method for the transformer voltage regulating winding connection lead-out structure includes the following steps:

[0014] Step 1: Select a connecting rod of appropriate length according to the voltage regulating winding;

[0015] Step 2: Connect the upper ends of the first and second connecting rods to the corresponding upper outputs of the voltage regulating windings, and connect the lower ends of the first and second connecting rods to the corresponding lower outputs of the voltage regulating windings.

[0016] Step 3: Wrap the outer sides of both the first and second connecting rods with an insulating layer;

[0017] Step 4: Set a binding pad between the first connecting rod and the second connecting rod, and fix the positions of the first connecting rod and the second connecting rod where the binding pad is set with a fixing strap.

[0018] Step 5: Connect the upper end of the third connecting rod to the upper outlet of the corresponding voltage regulating winding and the lower end to the lower outlet of the corresponding voltage regulating winding;

[0019] Step Six: Wrap the outside of the third connecting rod with an insulating layer;

[0020] Step 7: Set a binding pad between the second and third connecting rods, and fix the positions of the binding pads between the second and third connecting rods with a fixing strap;

[0021] Step 8: Repeat steps 5 through 7 until all connecting rods are installed;

[0022] Step 9: Install the outgoing cables into the corresponding outgoing lead connection terminals on the corresponding connecting rods.

[0023] In step one, connecting rods of different heights are used when the outlet heights of the voltage regulating windings are different, and connecting rods of the same height are used when the outlet heights of the voltage regulating windings are the same.

[0024] The advantages and positive effects of this invention are as follows:

[0025] 1. This invention connects the upper and lower parallel voltage regulating windings with connecting rods (copper rods). This structure eliminates the need to use wooden parts such as support bars to fix the copper busbars, reducing the difficulty of processing. At the same time, the entire winding is fixed with copper rods, which improves the winding's short-circuit resistance. Furthermore, this invention is applicable to voltage regulating windings of various structures (such as spiral, disc, etc.) and reactance heights, making it highly versatile.

[0026] 2. The present invention provides an insulating layer on the connecting rod, and the surge arrester can be directly connected to the connecting rod to achieve protection. This can reduce the insulation thickness of the voltage regulating winding, simplify the structure of the device body, and allow the use of thinner lead cables for easier cable lead-out.

[0027] 3. The present invention can thread the upper and lower ends of the voltage regulating winding into the sleeves at the corresponding ends of the connecting rod, which not only facilitates the connection, but also allows for fine adjustment of the connection height as needed. Attached Figure Description

[0028] Figure 1 This is a schematic diagram illustrating the usage state of one embodiment of the present invention.

[0029] Figure 2 for Figure 1 A schematic diagram of the connections of each connecting rod in the middle.

[0030] Figure 3 This is a schematic diagram illustrating the usage state of another embodiment of the present invention.

[0031] Figure 4 for Figure 3 A schematic diagram of the structure of a single connecting rod after the insulation layer has been removed.

[0032] Figure 5 This is a schematic diagram of a voltage regulating winding lead-out method in the prior art.

[0033] Figure 6 This is a schematic diagram of another voltage regulating winding lead-out method in the prior art.

[0034] Among them, 1 is the upper outlet of the voltage regulating winding, 2 is the lower outlet of the voltage regulating winding, 3 is the connecting rod, 4 is the lead wire connection end, 5 is the surge arrester lead wire connection end, 6 is the insulation layer, 7 is the voltage regulating winding, 8 is the fixing strap, and 9 is the binding pad. Detailed Implementation

[0035] The invention will now be described in further detail with reference to the accompanying drawings.

[0036] like Figures 1-6 As shown, the present invention includes a voltage regulating winding 7 and a connecting rod 3, wherein, as Figures 5-6As shown, the voltage regulating winding 7 is divided into upper and lower parts. The upper part of the voltage regulating winding 7 has multiple upper voltage regulating winding outlets 1 radially led out, and the lower part has multiple lower voltage regulating winding outlets 2 radially led out. The upper end of the connecting rod 3 is connected to the corresponding upper voltage regulating winding outlet 1, and the lower end is connected to the corresponding lower voltage regulating winding outlet 2. The outer side of the connecting rod 3 is first wrapped with an insulating layer 6, and then a binding pad 9 is set between two adjacent connecting rods 3. The binding pad 9 is fixed by a fixing binding strap 8. The connecting rod 3 is provided with an outgoing lead wire connection end 4 and a surge arrester lead wire connection end 5.

[0037] like Figures 1-4 As shown, in this embodiment, both the upper and lower ends of the connecting rod 3 are sleeve structures, so that the upper outlet 1 and the lower outlet 2 of the voltage regulating winding can be threaded or cold-pressed into the corresponding sleeves, respectively. In this embodiment, the connecting rod 3 is a copper rod, and the thickness of the connecting rod 3 is determined according to the current of the voltage regulating winding 7. Figures 5-6 As shown, the voltage regulating winding 7 adopts an upper and lower parallel connection, and can adopt a suitable structure as needed, such as spiral or disc type.

[0038] like Figures 1-4 As shown, in this embodiment, both the outgoing lead connection terminal 4 and the surge arrester lead connection terminal 5 are connecting sleeve structures. The head end of the outgoing lead can be threaded or cold-pressed into the connecting sleeve of the outgoing lead connection terminal 4, and the lead connected to the surge arrester can be threaded or cold-pressed into the connecting sleeve of the surge arrester lead connection terminal 5. The number of outgoing lead connection terminals 4 can be determined according to the current magnitude and the size of the lead cable. In addition, if the voltage regulating winding 7 does not need to be connected to the surge arrester, the surge arrester lead connection terminal 5 can be omitted.

[0039] like Figures 1-4 As shown, in this embodiment, the thickness of the insulation layer 6 on the outside of the connecting rod 3 is determined according to the insulation level of the voltage regulating winding 7.

[0040] like Figures 1-4 As shown, in this embodiment, the number and position of the binding pads 9 between two adjacent connecting rods 3 are determined according to the length of the connecting rod 3, but the distance between the binding pads 9 does not exceed 500mm. The binding pads 9 can be provided with slots on both sides as needed to engage with the connecting rod 3 to assist in installation. Then, the binding straps 8 are used to wrap and bind the positions of the two adjacent connecting rods 3 with the binding pads 9 tightly and firmly, which further ensures the stability and strength of the connecting rods 3.

[0041] like Figures 1-2 As shown, when the heights of the taps of the voltage regulating winding 7 are different, the present invention can use connecting rods 3 of different heights, such as... Figures 3-4As shown, when the heights of all taps of the voltage regulating winding 7 are the same, the present invention can use connecting rods 3 of the same height. Furthermore, since both the upper and lower ends of the connecting rod 3 are sleeve structures, if a threaded connection between the tap and the sleeve is used, even if there is a slight deviation in the height of the connecting rod 3, the insertion distance of the tap can be adjusted by rotating the connecting rod 3 relative to the others, thereby achieving fine-tuning of the height.

[0042] like Figures 1-4 As shown, the lead wire connection terminals 4 on each connecting rod 3 can be set to different heights to correspond to different gears, which facilitates the separate outflow of multiple lead wires and makes it easy to distinguish the connecting rods 3.

[0043] The working principle of this invention is as follows:

[0044] like Figures 5-6 As shown, the voltage regulating winding 7 in the prior art is generally divided into upper and lower parts, such as... Figure 5 The voltage regulating winding 7 shown has the same height for both the upper outlet 1 and the lower outlet 2 (a1~a4) of its upper portion and lower portion, respectively. Figure 6 The voltage regulating winding 7 shown has its upper voltage regulating winding head 1 and lower voltage regulating winding head 2 shifted by the same angle (b1~b10) in sequence.

[0045] This invention connects the upper and lower parallel voltage regulating windings using connecting rods 3 (copper rods). This structure eliminates the need for wooden supports or other wooden parts to fix the copper busbars, reducing the difficulty of processing. Furthermore, the copper rods fix the entire winding, improving its short-circuit withstand capability. This invention is applicable to various structures (such as spiral and disc types) and reactance heights of voltage regulating windings; only the appropriate height and diameter of the connecting rods 3 need to be selected based on the winding characteristics. It is flexible and highly adaptable.

[0046] The present invention provides an insulating layer 6 on the connecting rod 3, and the surge arrester can be directly connected to the connecting rod 3 to achieve protection. This can reduce the insulation thickness of the voltage regulating winding 7, simplify the structure of the device body, and allow the use of thinner lead cables for easier cable lead-out.

[0047] The present invention can thread the upper outlet 1 and the lower outlet 2 of the voltage regulating winding into the sleeves at the corresponding ends of the connecting rod 3, which not only makes the connection convenient, but also allows for fine adjustment of the connection height as needed.

Claims

1. A transformer voltage regulating winding connection lead-out structure, characterized in that: It includes a voltage regulating winding (7) and a connecting rod (3). The voltage regulating winding (7) is divided into upper and lower parts. The upper part of the voltage regulating winding (7) has multiple voltage regulating winding upper outlets (1) radially led out, and the lower part has multiple voltage regulating winding lower outlets (2) radially led out. The upper end of the connecting rod (3) is connected to the corresponding voltage regulating winding upper outlet (1), and the lower end is connected to the corresponding voltage regulating winding lower outlet (2). The outer side of the connecting rod (3) is first wrapped with an insulating layer (6), and then a binding pad (9) is set between two adjacent connecting rods (3). The position of the binding pad (9) is fixed by a fixing binding strap (8). The connecting rod (3) is provided with a lead wire connection end (4).

2. The transformer voltage regulating winding connection lead-out structure according to claim 1, characterized in that: The upper and lower ends of the connecting rod (3) are both sleeve structures, and the upper outlet (1) and lower outlet (2) of the voltage regulating winding are threaded into the corresponding sleeves.

3. The transformer voltage regulating winding connection lead-out structure according to claim 1, characterized in that: The connecting rod (3) is provided with a surge arrester lead connection terminal (5).

4. The transformer voltage regulating winding connection lead-out structure according to claim 3, characterized in that: Both the outgoing lead connection terminal (4) and the surge arrester lead connection terminal (5) are connecting sleeve structures.

5. The transformer voltage regulating winding connection lead-out structure according to claim 1, characterized in that: The binding pad (9) has slots on both sides for engaging and positioning with the connecting rod (3).

6. The transformer voltage regulating winding connection lead-out structure according to claim 1, characterized in that: The lead wire connection terminals (4) on each connecting rod (3) are set at different heights.

7. An installation method for the transformer voltage regulating winding connection lead-out structure according to claim 1, characterized in that: Includes the following steps: Step 1: Select a connecting rod (3) of appropriate length according to the voltage regulating winding (7); Step 2: Connect the upper end of the first connecting rod (3) and the upper end of the second connecting rod (3) to the corresponding upper outlet (1) of the voltage regulating winding respectively, and connect the lower end of the first connecting rod (3) and the lower end of the second connecting rod (3) to the corresponding lower outlet (2) of the voltage regulating winding respectively. Step 3: Wrap the outer side of the first connecting rod (3) and the outer side of the second connecting rod (3) with an insulating layer (6); Step 4: Set a binding pad (9) between the first connecting rod (3) and the second connecting rod (3), and fix the position of the binding pad (9) between the first connecting rod (3) and the second connecting rod (3) with a fixing strap (8). Step 5: Connect the upper end of the third connecting rod (3) to the upper outlet (1) of the corresponding voltage regulating winding and the lower end to the lower outlet (2) of the corresponding voltage regulating winding; Step 6: Wrap the outer side of the third connecting rod (3) with an insulating layer (6); Step 7: Set a binding pad (9) between the second connecting rod (3) and the third connecting rod (3), and fix the position of the binding pad (9) between the second connecting rod (3) and the third connecting rod (3) by fixing the binding strap (8); Step 8: Repeat steps 5 to 7 until all connecting rods (3) are installed; Step 9: Install the outgoing cables into the corresponding outgoing lead connection terminals (4) on the corresponding connecting rods (3).

8. The installation method of the transformer voltage regulating winding connection lead-out structure according to claim 7, characterized in that: In step one, when the outlet height of the voltage regulating winding (7) is different, connecting rods (3) of different heights are used; when the outlet height of the voltage regulating winding (7) is the same, connecting rods (3) of the same height are used.

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