Simulation test platform for inter-turn short circuit of dry-type air-core reactor

Abstract

A simulation test platform for inter-turn short circuit of a dry-type air-core reactor, comprising: an upper hanger, a lower hanger, and an open winding structure, wherein the open winding structure comprises a plurality of wire layers, the plurality of wire layers are of concentric circle structures, and the wire layers are formed by winding bare wires; the plurality of wire layers are separated by means of insulating support strips; a plurality of insulating cushion blocks are provided on each insulating support strip in a vertical direction; winding grooves for winding the bare wires are formed on the sides of the insulating cushion blocks away from the insulating support strips; gaps between the bare wires and the winding grooves are filled with insulating gaskets; and the insulating cushion blocks are slidably arranged on the insulating support strips in the vertical direction and are detachably connected to the insulating support strips by means of fixing members. The present invention is more flexible and convenient to use, and more closely simulates real inter-turn short-circuit faults, thereby ensuring the accuracy of test results.

Description

A dry-type air-core reactor inter-turn short-circuit simulation test platform

[0001] This application claims priority to Chinese Patent Application No. 202410789082.6, filed on June 19, 2024, entitled “A Short-Circuit Simulation Test Platform for Dry-Type Air-Core Reactors,” the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of power equipment testing technology, and in particular to a dry-type air-core reactor inter-turn short-circuit simulation test platform. Background Technology

[0003] In the traditional encapsulated dry-type air-core reactor structure, the conductor layer is wrapped in encapsulation material. There are two ways to simulate inter-turn short-circuit faults: one is to reserve wire terminals from the conductor layer before winding the encapsulation material during reactor production for wiring during inter-turn short-circuit tests; the other is to grind the surface of the existing reactor to peel off the conductor layer for wiring during inter-turn short-circuit tests.

[0004] However, both of the above methods have certain drawbacks: the first method has fixed terminal positions, making it impossible to change the inter-turn short-circuit location according to actual needs during testing, which is not conducive to analyzing the impact of inter-turn short-circuit faults. Moreover, considering the safety of inter-turn short-circuit tests, simulating inter-turn short-circuit faults requires very long leads, especially the leads of the intermediate sheath layer, which need to pass through the ventilation duct. This differs significantly from actual inter-turn short-circuit faults, and the test results will also be biased. The second method can only simulate inter-turn short-circuit faults in the innermost and outermost layers of the reactor, and there is also a risk of damaging the reactor when polishing it. Therefore, this invention proposes an inter-turn short-circuit simulation test platform for dry-type air-core reactors. Summary of the Invention

[0005] This application provides a dry-type air-core reactor inter-turn short-circuit simulation test platform, which makes it more flexible and convenient to use, and more closely resembles real inter-turn short-circuit faults, ensuring the accuracy of test results.

[0006] In view of this, this application provides a dry-type air-core reactor inter-turn short-circuit simulation test platform, including: an upper hanger, a lower hanger, and an open winding structure;

[0007] The open winding structure includes multiple conductor layers;

[0008] The plurality of said conductor layers are in a concentric circle structure, and the conductor layers are made of bare conductor wires wound together;

[0009] The multiple conductor layers are isolated by insulating struts;

[0010] Multiple insulating pads are provided on the insulating support bar along the vertical direction;

[0011] The insulating pad has a winding groove for winding the bare conductor on the side away from the insulating support bar;

[0012] The gap between the bare conductor and the winding groove is filled with an insulating pad.

[0013] The insulating pad is slidably disposed on the insulating support bar in the vertical direction and is detachably connected to the insulating support bar by a fixing member;

[0014] The insulating support bar is provided with an I-shaped sliding groove;

[0015] The insulating support bar is provided with a plurality of first positioning holes evenly distributed along its length for fixing the insulating pad block;

[0016] The insulating pad has a corresponding second positioning hole for cooperating with the first positioning hole;

[0017] The insulating pad is slidably mounted on the I-shaped groove and is detachably connected to the insulating support strip via the fixing member;

[0018] The fixing component is a positioning pin.

[0019] Optionally, the winding groove is a rectangular groove.

[0020] Optionally, it also includes: an inter-turn short-circuit simulation device for forming a conductive path between two adjacent bare conductors to simulate an inter-turn short-circuit fault.

[0021] Optionally, the inter-turn short-circuit simulation device includes a base, a spring assembly, and an upper cap;

[0022] The upper cap is rotatably mounted on the top of the base;

[0023] The mainspring assembly is located at the center of the top of the base, and the mainspring assembly is connected to the upper cap via a central connecting rod;

[0024] The upper cap is provided with an upper conductive terminal;

[0025] The base is provided with a lower conductive terminal;

[0026] The upper conductive terminal is electrically connected to the lower conductive terminal.

[0027] Optionally, both the base and the upper cap are made of insulating material.

[0028] Optionally, the insulating material is plastic.

[0029] As can be seen from the above technical solutions, the embodiments of this application have the following advantages: The dry-type air-core reactor inter-turn short circuit simulation test platform adopts an open winding structure. This structure uses bare wires (the wires themselves have no insulation layer) during the winding process. Short circuit points can be set at any position in the longitudinal direction of any wire layer according to actual needs, simulating inter-turn short circuit faults that are closer to the real situation, making the test results more consistent with the actual situation, and thus effectively solving the problems of large simulation effect deviation and inaccurate test results in traditional enclosed reactors when conducting inter-turn short circuit tests. Attached Figure Description

[0030] Figure 1 is a schematic diagram of the structure of the inter-turn short-circuit simulation test platform for dry-type air-core reactors in an embodiment of this application;

[0031] Figure 2 is a schematic diagram of the insulating support strip in an embodiment of this application;

[0032] Figure 3 is a schematic diagram of the structure of the insulating pad in an embodiment of this application;

[0033] Figure 4 is a schematic diagram of the connection structure between the insulating pad and the insulating support strip in an embodiment of this application;

[0034] Figure 5 is a schematic diagram of the inter-turn short-circuit simulation device in an embodiment of this application;

[0035] Figure 6 is a schematic diagram of the structure of the spring assembly and the central connecting rod in the embodiment of this application;

[0036] The attached figures are labeled as follows: 1-bare conductor, 2-insulating support bar, 21-I-shaped groove, 22-first positioning hole, 3-insulating pad, 31-winding groove, 32-second positioning hole, 4-inter-turn short circuit simulation device, 41-base, 42-upper cap, 43-upper conducting terminal, 44-lower conducting terminal, 45-spring assembly, 46-center connecting rod, 5-positioning pin. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0038] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] This application provides an embodiment of a dry-type air-core reactor inter-turn short-circuit simulation test platform, as shown in Figures 1 to 4.

[0041] The dry-type air-core reactor inter-turn short-circuit simulation test platform in this embodiment includes: an upper hanger, a lower hanger, and an open winding structure. The open winding structure includes multiple conductor layers, which are arranged in a concentric circle structure and are made of bare conductors 1. The multiple conductor layers are separated by insulating support bars 2. Multiple insulating pads 3 are arranged on the insulating support bars 2 in the vertical direction. The side of the insulating pad 3 away from the insulating support bars 2 has a winding groove 31 for winding the bare conductors 1. The gap between the bare conductors 1 and the winding groove 31 is filled with insulating pads. The insulating pads 3 are slidably arranged on the insulating support bars 2 in the vertical direction and are detachably connected to the insulating support bars 2 by fasteners. Specifically, the insulating support bar 2 is provided with an I-shaped groove 21, and multiple first positioning holes 22 for fixing the insulating pad 3 are evenly opened along the length direction on the insulating support bar 2. The insulating pad 3 is provided with a second positioning hole 32 for positioning and assembly in cooperation with the first positioning holes 22. The insulating pad 3 is slidably installed on the I-shaped groove 21 and is detachably connected to the insulating support bar 2 by a fixing member; the fixing member is a positioning pin 5.

[0042] It should be noted that this dry-type air-core reactor inter-turn short-circuit simulation test platform adopts an open winding structure. This structure uses bare conductor 1 (the conductor itself has no insulation layer) during the winding process. Short-circuit points can be set at any position in the longitudinal direction of any conductor layer according to actual needs, simulating inter-turn short-circuit faults that are closer to real conditions. This makes the test results more consistent with the actual situation, and thus effectively solves the problems of large simulation effect deviation and inaccurate test results in traditional enclosed reactors when conducting inter-turn short-circuit tests.

[0043] The above is Embodiment 1 of a dry-type air-core reactor inter-turn short-circuit simulation test platform provided in this application. The following is Embodiment 2 of a dry-type air-core reactor inter-turn short-circuit simulation test platform provided in this application. Please refer to Figures 1 to 6 for details.

[0044] The dry-type air-core reactor inter-turn short-circuit simulation test platform in this embodiment includes: an upper hanger, a lower hanger, and an open winding structure. The open winding structure includes multiple conductor layers, which are arranged in a concentric circle structure and are made of bare conductor 1.

[0045] Multiple conductor layers are separated by insulating support strips 2. Multiple insulating pads 3 are provided on the insulating support strips 2 in the vertical direction. A winding groove 31 for winding bare conductors 1 is formed on the side of the insulating pads 3 away from the insulating support strips 2. Specifically, the winding groove 31 can be a rectangular groove.

[0046] It should be noted that this test platform uses insulating support strips 2 to isolate different conductor layers, uses insulating pads 3 to control the inter-turn distance of bare conductors 1, and uses air to form inter-layer and inter-turn insulation.

[0047] The gap between the bare conductor 1 and the winding groove 31 is filled with an insulating pad. By using the insulating pad to fill the gap of the bare conductor 1 in the rectangular groove, it is possible to wind bare conductors 1 of different diameters.

[0048] The insulating pad 3 is slidably mounted on the insulating support bar 2 in the vertical direction and is detachably connected to the insulating support bar 2 by a fastener.

[0049] The insulating support bar 2 is provided with an I-shaped groove 21. Multiple first positioning holes 22 for fixing the insulating pad 3 are evenly opened along the length direction of the insulating support bar 2. The insulating pad 3 is provided with a second positioning hole 32 for positioning and assembly in cooperation with the first positioning holes 22. The insulating pad 3 is slidably installed on the I-shaped groove 21 and is detachably connected to the insulating support bar 2 by a fixing member; the fixing member is a positioning pin 5.

[0050] It is understandable that the hole spacing of the first positioning hole 22 can be set as needed to adjust the installation position of the insulating pad 3, thereby achieving the purpose of adjustable insulation distance between the bare conductor 1 turns, which is suitable for different design requirements.

[0051] It also includes: an inter-turn short-circuit simulation device 4 for forming a conductive path between two adjacent bare conductors 1 to simulate an inter-turn short-circuit fault.

[0052] It should be noted that during the test, an inter-turn short circuit simulation device 4 can be set between the turns of the bare conductor 1. This device can be placed at any position in the conductor layer. By controlling this device, two adjacent turns of bare conductor 1 can form a conductive path, thereby simulating an inter-turn short circuit fault.

[0053] The inter-turn short circuit simulation device 4 includes a base 41, a spring assembly 45, and an upper cap 42. The upper cap 42 is rotatably mounted on the top of the base 41. The spring assembly 45 is located at the center of the top of the base 41 and is connected to the upper cap 42 via a central connecting rod 46. An upper conductive terminal 43 is provided on the upper cap 42, and a lower conductive terminal 44 is provided on the base 41. The upper conductive terminal 43 and the lower conductive terminal 44 are electrically connected. Specifically, the upper conductive terminal 43 and the lower conductive terminal 44 are connected by a metal conductive mechanism.

[0054] It should be noted that this inter-turn short-circuit simulation device 4 is modified from a mechanical timer. By rotating the upper cap 42 to tighten the spring assembly 45, and releasing it, the upper cap 42 and the upper conductive terminal 43 achieve synchronous reverse self-rotation. In use, the inter-turn short-circuit simulation device 4 can be embedded between two bare turns of wire 1, and the lower conductive terminal 44 is brought into contact with the lower bare turn of wire 1 (before simulating an inter-turn short circuit, the device is in a locked state, and the bare turns of wire 1 are in an insulated state). Then, by rotating the timer to unlock, the upper conductive terminal 43 gradually approaches the upper bare turn of wire 1 as the upper cap 42 rotates, until it contacts the bare turn of wire 1 to form a conductive path, thus simulating an inter-turn short-circuit fault.

[0055] Both the base 41 and the upper cap 42 are made of insulating material. Specifically, the insulating material can be plastic.

[0056] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A dry-type air-core reactor inter-turn short-circuit simulation test platform, characterized in that, The application relates to an open-winding structure of a power transformer. The open-winding structure comprises a plurality of wire layers. The plurality of wire layers are arranged in a concentric circle structure and are wound by bare wires. The plurality of wire layers are separated by insulating supports. A plurality of insulating pads are arranged on the insulating supports in a vertical direction. A winding groove for winding the bare wires is arranged on the side of the insulating pad away from the insulating support. An insulating pad is arranged between the bare wire and the winding groove. The insulating pad is arranged on the insulating support in a sliding mode in the vertical direction and is detachably connected to the insulating support through a fixing member. A I-shaped sliding groove is arranged on the insulating support. A plurality of first positioning holes for fixing the insulating pad are uniformly arranged on the insulating support in a length direction. A second positioning hole corresponding to the first positioning hole is arranged on the insulating pad. The insulating pad is arranged on the I-shaped sliding groove in a sliding mode and is detachably connected to the insulating support through the fixing member. The fixing member is a positioning pin shaft. The winding groove is a rectangular groove.

2. The dry-type air-core reactor turn-to-turn short-circuit simulation test platform according to claim 1, characterized in that, The application further relates to a turn-to-turn short-circuit simulation device.

3. The dry-type air-core reactor turn-to-turn short-circuit simulation test platform according to claim 1, characterized in that, The turn-to-turn short-circuit simulation device comprises a base, a clockwork assembly and an upper end cap. The upper end cap is arranged on the top of the base in a rotating mode.

4. The dry-type air-core reactor turn-to-turn short-circuit simulation test platform according to claim 3, characterized in that, The clockwork assembly is arranged at the center of the top of the base and is connected to the upper end cap through a center connecting rod. An upper conducting terminal is arranged on the upper end cap. A lower conducting terminal is arranged on the base. The upper conducting terminal is electrically connected to the lower conducting terminal. The base and the upper end cap are made of insulating materials. The insulating material is plastic.

5. The dry-type air-core reactor turn-to-turn short-circuit simulation test platform according to claim 4, characterized in that, ​ 6. The dry-type air-core reactor turn-to-turn short-circuit simulation test platform according to claim 5, characterized in that, ​

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