A transformer impedance testing device

Abstract

This utility model relates to a transformer resistance testing device, belonging to the field of transformer technology. The transformer resistance testing device includes: a testing instrument body, a protective cover rotatably connected to the top of the testing instrument body, a connecting mechanism mounted on the testing instrument body, a testing wire plug inserted into the socket, a connecting rod fixedly connected to the top of the testing wire plug, a connecting seat fixedly connected to the top of the connecting rod, a testing wire on the surface of the connecting seat, and a limiting groove corresponding to the compression ball on the surface of the testing wire plug. The above-mentioned transformer resistance testing device achieves rapid insertion and removal of the testing wire through the elastic locking mechanism between the testing wire plug and the socket. During insertion, the compression ball and spring automatically lock the wire; during removal, only the connecting seat needs to be pressed down to allow the compression ball to slide along the semi-cylindrical surface of the limiting groove to disengage from the lock, and after rotation, it can be directly pulled out without repeatedly tightening and loosening the cap, reducing operating steps.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to a transformer resistance testing device. Background Technology

[0002] A transformer is a device that uses the principle of electromagnetic induction to change alternating current voltage. Its main components are the primary coil, secondary coil, and iron core (magnetic core). Its main functions include voltage transformation, current transformation, impedance transformation, isolation, and voltage stabilization (magnetic saturation transformer). The transformer short-circuit impedance tester is a basic item in routine testing, comparing the short-circuit impedance values ​​measured before and after the transformer is subjected to a short-circuit current. The testing instrument is a transformer low-voltage short-circuit impedance tester.

[0003] As shown in the reference case "A Transformer Short-Circuit Resistance Testing Device" (Announcement No. CN219369881U), this solution improves the structure of the plug socket by replacing the top of the plug rod with a petal-shaped clamping plate. A clamping plate tightening cap is screwed onto the outer side of the plug socket. After the test line plug is inserted into the plug rod, the clamping plate tightening cap is screwed upwards. The clamping plate tightening cap can squeeze and shrink the petal-shaped clamping plate inward through the tightening hole, so that the petal-shaped clamping plate tightly presses against the test line plug, improving the stability of the test line plug insertion and making it more practical.

[0004] However, although the above-mentioned testing device improves the stability of the test line plug, it requires multiple insertions and removals of the test line when testing multi-winding transformers. Each time the test line is removed, the tightening cap needs to be loosened before the test line can be pulled out, making the operation quite complicated. Utility Model Content

[0005] Therefore, it is necessary to provide a transformer resistance testing device to address the issue of the complex operation of pulling out the test line.

[0006] A transformer impedance testing device includes: a tester body, a protective cover rotatably connected to the top of the tester body, and a connecting mechanism installed on the tester body; the connecting mechanism includes an insertion hole on the surface of the tester body, positioning strips symmetrically arranged in the insertion hole, a compression ball slidably connected in the insertion hole, a spring fixedly connected between the compression ball and the tester body, a test line plug inserted into the insertion hole, a connecting rod fixedly connected to the top of the test line plug, a connecting seat fixedly connected to the top of the connecting rod, a test line provided on the surface of the connecting seat, and a limiting groove corresponding to the compression ball formed on the surface of the test line plug.

[0007] In one embodiment, the detector body has a limiting cavity with the same diameter as the extrusion ball, and the spring is disposed in the limiting cavity.

[0008] In one embodiment, the limiting groove is configured as an upper hemisphere and a lower hemisphere, and the upper hemisphere and the lower hemisphere have the same diameter.

[0009] In one embodiment, the surface of the detection line plug is symmetrically provided with positioning grooves corresponding to the positioning strips, and the length of the positioning grooves is the same as the height of the detection line plug.

[0010] In one embodiment, the surface of the extruded ball is provided with an insulating and wear-resistant layer, which is made of polytetrafluoroethylene.

[0011] In one embodiment, the bottom of the detection line plug is provided with a buffer pad, and the center of the buffer pad has a through hole adapted to the internal circuit of the plug.

[0012] In one embodiment, the socket opening is provided with a chamfered structure, and the inner wall of the socket is provided with an insulating sealing gasket.

[0013] In one embodiment, the surface of the detector body is provided with a plurality of sockets, and the detector body is fixedly connected with a mark corresponding to the socket.

[0014] Beneficial effects

[0015] 1. The above-mentioned transformer resistance testing device achieves quick insertion and removal of the test line by means of the elastic locking of the test line plug and the socket. When inserted, it automatically locks with the help of the squeeze ball and the spring. When pulled out, it is only necessary to press down the connecting seat to make the squeeze ball slide along the semi-cylindrical surface of the limiting groove to disengage from the lock. After rotation, it can be pulled out directly without the need to repeatedly tighten and loosen the tightening cap, thus reducing the operation steps.

[0016] 2. The structure of squeezing the ball into the lower half of the limiting groove, in conjunction with the continuous elastic force of the spring, ensures stable contact between the test line plug and the socket, avoiding problems such as plug loosening or poor contact caused by vibration or accidental contact during the test. At the same time, the cooperation between the positioning strip and the positioning groove further restricts the plug from rotating in the circumferential direction, ensuring the stability of the test signal transmission. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the connection mechanism of this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the detector body of this utility model;

[0021] Figure 4 For the present utility model Figure 3 Enlarged view of the structure at point A in the middle;

[0022] Figure 5 This is a schematic diagram of the installation structure of the extrusion ball and the limiting groove of this utility model.

[0023] Figure label:

[0024] 100. Detector body; 200. Protective cover; 300. Connecting mechanism; 310. Socket; 320. Connecting rod; 330. Connecting seat; 340. Limiting groove; 350. Extrusion ball; 360. Spring; 370. Positioning strip; 380. Positioning groove; 390. Detection line plug. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0026] The following is combined Figure 1 - Figure 5 This invention describes a transformer resistance testing device.

[0027] In one embodiment, a transformer resistance testing device includes a tester body 100, a protective cover 200 rotatably connected to the top of the tester body 100, and a connecting mechanism 300 mounted on the tester body 100. The connecting mechanism 300 includes an insertion hole 310 formed on the surface of the tester body 100, positioning strips 370 symmetrically arranged inside the insertion hole 310, a compression ball 350 slidably connected inside the insertion hole 310, a spring 360 fixedly connected between the compression ball 350 and the tester body 100, a test line plug 390 inserted into the insertion hole 310, a connecting rod 320 fixedly connected to the top of the test line plug 390, a connecting seat 330 fixedly connected to the top of the connecting rod 320, a test line provided on the surface of the connecting seat 330, and a limiting groove 340 corresponding to the compression ball 350 formed on the surface of the test line plug 390.

[0028] like Figure 2 , Figure 4 and Figure 5 As shown, the detector body 100 has a limiting cavity with the same diameter as the extrusion ball 350, and the spring 360 is disposed in the limiting cavity. The limiting groove 340 is configured with an upper hemisphere and a lower hemisphere, and the upper hemisphere and the lower hemisphere have the same diameter. The surface of the detection line plug 390 is symmetrically provided with positioning grooves 380 corresponding to the positioning strip 370, and the length of the positioning grooves 380 is the same as the height of the detection line plug 390.

[0029] In this embodiment, the limiting cavity provides installation space for the extrusion ball 350 and the spring 360. By limiting the sliding range of the extrusion ball 350, excessive displacement is avoided, while ensuring that the spring 360 can stably provide elastic force. The upper hemispherical section of the limiting groove 340 can precisely engage with the extrusion ball 350 to form a stable axial lock, preventing the plug from accidentally falling off during the testing process; the lower cylindrical section provides a smooth transition during the insertion and removal process. When an external force is applied, the extrusion ball 350 can slide along the cylindrical surface to unlock, without complicated operations. The cooperation between the positioning strip 370 and the positioning groove 380 ensures the insertion direction of the test line plug 390, effectively avoiding poor contact or structural damage caused by misinsertion, while improving guidance during the insertion and removal process, allowing the plug to be quickly aligned and inserted.

[0030] like Figure 1 , Figure 3 and Figure 4 As shown, the surface of the extrusion ball 350 is provided with an insulating and wear-resistant layer, which is made of polytetrafluoroethylene. A buffer pad is provided at the bottom of the test line plug 390, and a through hole adapted to the internal wiring of the plug is opened in the center of the buffer pad. A chamfered structure is provided at the opening of the socket 310, and an insulating sealing gasket is provided on the inner wall of the socket 310. Multiple sockets 310 are provided on the surface of the tester body 100, and markings corresponding to the sockets 310 are fixedly connected to the tester body 100.

[0031] In this embodiment, the PTFE insulating and wear-resistant layer on the surface of the extrusion ball 350 significantly improves the wear resistance and insulation performance of the component, reduces frictional loss during insertion and removal, and extends the service life of the connection mechanism 300. The buffer pad at the bottom of the test line plug 390 effectively absorbs the impact force during insertion and removal, preventing damage to the circuit caused by hard collision between the test line plug 390 and the bottom of the socket 310. The wire hole ensures that the internal circuit is neatly arranged, preventing the circuit from tangling or abrasion. The chamfer at the opening of the socket 310 facilitates quick alignment and insertion of the test line plug 390, reducing the difficulty of operation; the insulating sealing gasket on the inner wall enhances the insulation and sealing of the interface, preventing dust and moisture from entering and affecting contact stability, while reducing the risk of electric shock. The multiple plug holes 310 on the surface of the tester body 100, with corresponding markings, can meet the needs of simultaneous or step-by-step testing of multi-winding transformers. The markings clearly indicate the function and purpose of each plug hole 310, avoiding incorrect insertion and improving the convenience and accuracy of the testing operation.

[0032] Working principle: During the test line connection stage, the operator aligns the test line plug 390 with the socket 310 on the surface of the tester body 100. The positioning groove 380 on the surface of the test line plug 390 precisely engages with the positioning strip 370 inside the socket 310, ensuring the correct insertion direction of the plug. During insertion, the surface of the test line plug 390 first contacts the compression ball 350 inside the socket 310 and applies radial pressure to the compression ball 350, causing the compression ball 350 to slide into the limiting cavity inside the tester body 100. Simultaneously, it compresses the spring 360 connected to the compression ball 350, and the spring 360 generates elastic potential energy due to deformation. As the detection line plug 390 continues to move downward, when the limiting groove 340 on the plug surface moves to the position corresponding to the extrusion ball 350, the spring 360 releases its elastic potential energy, pushing the extrusion ball 350 into the lower semi-circular section of the limiting groove 340, forming an axial locking structure. At this time, the detection line plug 390 is stably fixed in the socket 310, and the detection line on the surface of the connector 330 is connected to the internal circuit of the detection line plug 390 through the connecting rod 320, realizing the stable transmission of the detection signal.

[0033] When pulling out, the operator presses down on the connector 330, which drives the test line plug 390 to continue moving downward within the socket 310 via the connecting rod 320. Due to the special structure of the limiting groove 340, which has an upper semi-cylindrical and a lower hemispherical shape, the compression ball 350 slides along the upper semi-cylindrical part of the limiting groove 340 during the downward movement. When the test line plug 390 moves down to the positioning groove 380 and completely disengages from the positioning strip 370, the plug is released from axial restriction. At this time, the connector 330 is rotated to displace the positioning groove 380 from the positioning strip 370, and the connector 330 is pulled upward to pull the test line plug 390 out of the socket 310.

[0034] It should be noted that the detector body 100 and the detection lines mentioned above are all components with relatively mature existing technologies. The specific models can be selected according to actual needs. At the same time, the detector body 100 can be powered by the built-in power supply or by the mains power. The specific power supply method should be selected according to the situation, and will not be elaborated here.

[0035] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model 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 will 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 utility model.

Claims

1. A transformer resistance test device, characterized by, include: The detector body (100) has a protective cover (200) rotatably connected to the top of the detector body (100), and a connecting mechanism (300) is installed on the detector body (100). The connecting mechanism (300) includes a socket (310) on the surface of the detector body (100), a positioning strip (370) is symmetrically arranged in the socket (310), a compression ball (350) is slidably connected in the socket (310), a spring (360) is fixedly connected between the compression ball (350) and the detector body (100), a detection line plug (390) is inserted into the socket (310), a connecting rod (320) is fixedly connected to the top of the detection line plug (390), a connecting seat (330) is fixedly connected to the top of the connecting rod (320), a detection line is provided on the surface of the connecting seat (330), and a limiting groove (340) corresponding to the compression ball (350) is opened on the surface of the detection line plug (390).

2. The transformer resistance test device of claim 1, wherein, The detector body (100) has a limiting cavity with the same diameter as the extrusion ball (350), and the spring (360) is disposed in the limiting cavity.

3. The transformer resistance test device of claim 1, wherein, The limiting groove (340) is set in the form of an upper hemisphere and a lower hemisphere, and the upper hemisphere and the lower hemisphere have the same diameter.

4. The transformer resistance testing device of claim 1, wherein, The surface of the test line plug (390) is symmetrically provided with positioning grooves (380) corresponding to the positioning strip (370), and the length of the positioning grooves (380) is the same as the height of the test line plug (390).

5. The transformer resistance testing device of claim 1, wherein, The surface of the extruded ball (350) is provided with an insulating and wear-resistant layer, which is made of polytetrafluoroethylene.

6. The transformer resistance testing device of claim 1, wherein, The bottom of the detection line plug (390) is provided with a buffer pad, and the center of the buffer pad is provided with a wire hole that is compatible with the internal circuit of the plug.

7. The transformer resistance testing device of claim 1, wherein, The opening of the socket (310) is provided with a chamfer, and the inner wall of the socket (310) is provided with an insulating sealing gasket.

8. The transformer resistance testing device of claim 1, wherein, The detector body (100) has multiple sockets (310) on its surface, and the detector body (100) has markings corresponding to the sockets (310) fixedly connected to it.

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