Portable mutual inductor test transfer box

Abstract

The utility model relates to a portable mutual inductor test transfer box, which comprises a box body, a plurality of automatic winders are arranged in the box body, a test wire is wound on each automatic winder, the colors of the test wires on the plurality of automatic winders are different, one end of each test wire is connected with a first connector used for being connected with a mutual inductor, and the other end of each test wire is connected with a second connector used for being connected with the mutual inductor. And the other end of the first connector is connected with a second connector which is used for being connected with a mutual inductor tester and is integrated with a plug-in structure and a crimping structure. The wire take-up and pay-off device can take up and pay off conveniently and can be matched with mutual inductor testers with different interfaces, the problem of wiring errors is avoided due to the test wires with different colors, and the wire take-up and pay-off device is more beneficial to use.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment, and in particular to a portable instrument transformer test adapter box. Background Technology

[0002] Against the backdrop of the integrated development of power grids and telecommunications networks, increasingly stringent safety requirements, and a more severe safety situation, the testing of instrument transformers has become increasingly complex. This involves a growing number of instrument transformer models, types, and voltage levels, placing higher demands on the safety, accuracy, and efficiency of instrument transformer testing. Furthermore, when testing instrument transformers in power system substations, prolonged power outages are unacceptable. This necessitates that testing personnel complete the instrument transformer tests within a very short timeframe to control the total outage duration and quickly restore power, ensuring sufficient time for maintenance personnel to perform subsequent operations.

[0003] When testing current transformers, the test leads used in field tests are generally quite long. Due to limitations imposed by the distribution of equipment on-site, test personnel must connect the test leads according to the distribution of equipment, resulting in a messy and tangled mess of primary, grounding, and secondary test leads. This messy wiring increases the risk of wiring errors. After the test, test personnel must manually untangle each test lead, which is time-consuming, increases their workload, and reduces the error rate and lifespan of the test leads. Furthermore, existing current transformer testers have either plug-in or crimp-in interfaces, which can lead to incompatibility between the test lead connectors and the tester's interface, hindering usability. Utility Model Content

[0004] To address the shortcomings of existing solutions, this utility model provides a portable instrument transformer test adapter box.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a portable transformer test adapter box, including a box body, wherein multiple automatic winding machines are arranged inside the box body, each automatic winding machine is wound with a test wire, the test wires on the multiple automatic winding machines are all different colors, one end of each test wire is connected to a first connector for connecting to a transformer, and the other end is connected to a second connector for connecting to a transformer tester, which integrates a plug-in structure and a crimping structure.

[0006] Preferably, a display device is provided between the second connector and the test lead.

[0007] Preferably, the display device is an LCD screen, and an AC contactor is provided between the LCD screen and the test leads.

[0008] Preferably, the second connector includes a conductive pin for insertion, an insulating seat disposed at the tail of the pin, and an annular nut threaded onto the pin, wherein the nut is threaded onto the pin near the insulating seat and the head of the pin protrudes from the nut.

[0009] Preferably, a nut protrusion extends from the outer side wall of the nut.

[0010] Preferably, the automatic winding device includes a housing, a turntable rotatably mounted inside the housing, coil springs with their ends connected to the housing and the turntable respectively for driving the turntable to rotate, a winding spool coaxial with the turntable and fixedly mounted on the surface of the turntable away from the coil springs for winding test leads, and conductive rings and conductive contacts disposed between the winding spool and the housing for electrically connecting the test leads and the second connector and being rotatably engaged with each other.

[0011] Preferably, the outer wall of the turntable has multiple turntable protrusions extending at intervals along the circumference of the turntable, and a limiting adjustment member with one end outside the housing and the other end able to abut against and limit the turntable protrusions is pivotally connected to the housing.

[0012] Preferably, the inner wall of the housing is also provided with an annular support platform for supporting the turntable.

[0013] Preferably, the first connector extends from the side wall of the housing, and the test wire is fitted with a stop block located outside the housing at one end connected to the first connector.

[0014] Preferably, the outer side wall of the housing is provided with a side wall groove for placing the first connector and the stop block, and a cover plate is provided on the side wall groove.

[0015] The beneficial effects of this utility model are as follows: By setting multiple automatic wire winders in the housing, multiple test wires are concentrated in one housing, which facilitates storage and transportation. The use of automatic wire winders for winding and unwinding solves the problems existing in manual wire winding and unwinding. In addition, each of the multiple automatic wire winders winds a different color of test wire, which can avoid the problem of wiring errors. Moreover, the connector for connecting the test wires to the current transformer tester is a connector with an integrated plug-in structure and a crimping structure, which can be well adapted to current transformer testers with different interfaces, making it more convenient to use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the internal structure of the box body with the lid removed according to an embodiment of this utility model;

[0017] Figure 2 This is a schematic diagram of the external structure of the box body according to an embodiment of the present utility model;

[0018] Figure 3This is a cross-sectional structural schematic diagram of the automatic cable reel in an embodiment of the present invention;

[0019] Figure 4 This is an embodiment of the present utility model. Figure 3 A magnified structural diagram of A in the middle;

[0020] Figure 5 This is a cross-sectional view of the second connector according to an embodiment of the present invention;

[0021] Figure 6 This is a schematic diagram of the cross-sectional structure of the automatic winding device along the radial direction of the turntable according to an embodiment of this utility model;

[0022] Component names and serial numbers in the diagram: 1-Box body; 10-Side wall groove; 11-Cover plate; 12-Box cover; 2-Automatic winding device; 20-Housing shell; 21-Turntable; 22-Coil spring; 23-Winding shaft; 24-Conductive ring; 25-Conductive contact; 200-Limit adjustment component; 201-Through hole; 202-Shaft; 203-Housing shell through hole; 210-Turntable protrusion; 3-Test lead; 4-First connector; 5-Second connector; 50-Pin; 51-Insulating base; 52-Nut; 53-Nut protrusion; 6-Display device; 7-Support platform; 8-Stop. Detailed Implementation

[0023] To more clearly illustrate the purpose, technical solution, and advantages of the embodiments of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. A clear and complete description will be provided. Obviously, the described embodiments are some, but not all, 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 protection scope of this utility model.

[0024] Examples of embodiments of this utility model Figures 1 to 6As shown, a portable transformer test adapter box includes a box body 1, which is a box made of ABS resin with a lid 12. This adapter box is lighter and more suitable for outdoor use in power systems. Handles and wheels are also provided on opposite sides of the box body 1 for easy transport. Multiple automatic winding coils 2 are installed inside the box body 1, arranged sequentially and at intervals along the same inner wall of the box body 1. The automatic winding coils 2 are mounted inside the box body 1 via mounting brackets. Each automatic winding coil 2 has a test lead 3 wound on it. The test leads 3 on the multiple automatic winding coils 2 are all different colors. If one test lead 3 is wound on each automatic winding coil 2, the two ends of the test lead 3 are used to connect the transformer and the transformer tester, respectively. The different colors of the test leads 3 on the multiple automatic winding coils 2 allow one color of test lead 3 to be connected to one end of the transformer and one end of the transformer tester. Correspondingly, if the transformer is a current transformer (CT), the transformer tester is also a current transformer tester. One end of test lead 3 is used to connect to the terminals (S1 / S2 terminals) on the secondary side of the current transformer, and the other end is used to connect to the current input terminal (I+ / I-) of the current transformer tester. If the transformer is a voltage transformer (PT), the transformer tester is also a voltage transformer tester. One end of test lead 3 is used to connect to the terminals (A / X terminals) on the secondary side of the voltage transformer, and the other end is used to connect to the voltage input terminal of the voltage transformer tester. The number of automatic reels 2 is determined according to the... The settings are configured according to requirements. For example, if four automatic cable reels 2 are installed, a front-to-back partition is installed inside the housing 1 to divide the housing 1 into left and right parts. The four automatic cable reels 2 are arranged sequentially from front to back along the left inner wall of the housing 1 in the left part. The right part can be used as a storage compartment to store tools or replacement parts, or to install a display device 6. Adjacent automatic cable reels 2 can also be separated by left-to-right partitions. For ease of use, one end of the test lead 3 is passed through the left side wall of the housing 1, i.e., connected... One end of the first connector 4 extends out from the left side wall of the housing 1, which means that there are four housing through holes (not shown in the figure) on the left side wall of the housing 1 corresponding to the four automatic reels 2. Then, the four test wires 3 on the four automatic reels 2 extend out from the corresponding housing through holes for easy use. One end of each test wire 3 is connected to the first connector 4 for connecting to the current transformer, and the other end is connected to the second connector 5 for connecting to the current transformer tester, which integrates the plug-in structure and the crimping structure. The second connector 5 is a connector that can be used for both plugging and crimping, so it can be adapted to current transformer testers with different interfaces.

[0025] Further improvements, such as Figure 1As shown, a display device 6 is installed between the second connector 5 and the test lead 3. The display device 6 displays the continuity status of the circuit. For example, the display device 6 can be an LCD screen, a diode, etc. The LCD screen displays the current value of the circuit digitally. If the current value is within a set range, it indicates that the circuit is connected; if the current is 0, it indicates that the circuit is disconnected. Preferably, the display device 6 is an LCD screen. An AC contactor (not shown in the figure) is installed between the LCD screen and the test lead 3. The AC contactor can be used to protect the current transformer tester. 。

[0026] Further improvements, such as Figure 5 As shown, the second connector 5 includes a conductive pin 50 for insertion, an insulating seat 51 located at the tail of the pin 50, and an annular nut 52 threaded onto the pin 50. The nut 52 is threaded onto the pin 50 near the insulating seat 51, and the head of the pin 50 protrudes from the nut 52. The pin 50 is a cylindrical structure made of pure copper, with a connection hole at its tail for connecting a test lead 3. The test lead 3 is soldered into this connection hole. The insulating seat 51 is fixedly fitted onto the tail of the pin 50, and an external thread is provided on the side wall of the pin 50 near the insulating seat 51. The nut 52 can be a nut made of insulating material, or it can be a metal nut body and an insulating ring fixedly fitted onto its outer side wall, with an internal thread. The nut 52 is then threaded onto the pin 50, at which point the head of the pin 50 protrudes from the nut. The pin 50 protrudes from the ring of nut 52. During plug-in connection, screw nut 52 toward insulating base 51, and the portion of pin 50 protruding from the nut is used for plugging. During crimping, if the connecting terminal is U-shaped, screw nut 52 away from insulating base 51, the connecting terminal engages with pin 50, and then tighten nut 52 in the opposite direction. If the connecting terminal is ring-shaped, first remove nut 52 from pin 50, then place the connecting terminal onto pin 50, and finally tighten nut 52 onto pin 50. For safety, an insulating sleeve can be fitted onto the portion of pin 51 protruding from nut 52 during crimping. To facilitate the tightening of the nut 52, when the nut 52 is made of insulating material, a nut protrusion 520 extends from the outer wall of the nut 52. When the nut 52 is composed of a metal nut body and an insulating ring, a nut protrusion 520 extends from the outer wall of the insulating ring. The nut 52 is tightened by applying force to the nut protrusion 520.

[0027] Further improvements, such as Figure 3 and Figure 4As shown, the automatic winding device 2 includes a housing 20, a turntable 21 rotatably mounted inside the housing 20, coiling springs 22 with their ends corresponding to the housing 20 and the turntable 21 for driving the turntable 21 to rotate, a winding spool 23 coaxial with the turntable 21 and fixedly mounted on the surface of the turntable 21 away from the coiling springs 22 for winding the test wire 3, and a conductive ring 24 and conductive contact 25 disposed between the winding spool 23 and the housing 20 for electrically connecting the test wire 3 and the second connector 5 and rotatably engaging with each other; the housing 20 is a housing formed by the interlocking of a left housing and a right housing to form an accommodating cavity. The housing 20 is mounted in the housing 1 using a mounting bracket. If a flat-bottomed U-shaped mounting bracket is used, the mounting bracket is first... The housing 20 is installed inside the bottom of the housing 1 using screws, and then the housing 20 is installed inside the U-shaped opening of the mounting bracket using screws. The turntable 21 is a circular turntable. If the turntable 21 is set inside the housing 20 near the right inner wall of the housing 20, a circular turntable hole is set at the center of the turntable 21. A rotating shaft 202 is set on the right inner wall of the housing 20 corresponding to the position of the turntable hole, and the turntable 21 can rotate relative to the rotating shaft 202. At the same time, a winding shaft 23 with the coaxial center line of the turntable hole is set on the left side surface of the turntable 21. The right end of the winding shaft 23 is fixedly connected to the left side surface of the turntable 21, such as the winding shaft 23 and the turntable 21 being integrally formed. The test wire 3 is wound on the winding shaft 23, and the left end of the winding shaft 23 is sleeved. A conductive ring 24 is provided, which is connected to one end of the test lead 3 used to connect to the second connector 5. A housing through hole 203, coaxial with the winding spool 23, is provided on the left side wall inside the housing 20. The left end of the winding spool 23 is rotatably installed in the housing through hole 203. A conductive contact 25, rotatably connected to the conductive ring 24, is provided on the wall of the housing through hole 203. A conductive ring groove, circumferentially surrounding the conductive ring 24, is provided on the outer wall of the conductive ring 24. The conductive contact 25 is a matching conductive post slidably mounted in the conductive ring groove on the inner wall of the housing through hole 203. The second connector 5 is located outside the housing 20 and is connected to the conductive ring 203 using the same connecting wire as the test lead 3 on the automatic winding device 2. On the column, for example, a mounting groove is provided on the wall of the through hole 203 of the housing to install the connecting wire; under the same principle, a conductive contact 25 can be provided on the winding spool 23, and a conductive ring 24 can be installed in the through hole 203 of the housing. The conductive contact 25 and the conductive ring 24 are rotatably connected, and the conductive ring 24 is connected to the second connector 5 through the connecting wire; the coil spring 22 is provided between the right side surface of the turntable 21 and the right side wall inside the housing 20. The coil spring 22 is in a coiled state. One end of the coil spring 22 is connected to the rotating shaft 202, and the other end is connected to the turntable 21. When the test wire 3 is released, the coil spring 22 is unfolded. When the wire is retracted, the turntable 21 rotates under the elastic force of the coil spring 22, thereby winding the test wire 3 onto the winding spool 23;Meanwhile, the housing 20 is provided with a through hole 201 for the end of the test lead 3 with the first connector to pass through. The through hole 201 is provided with a strip-shaped through hole along the axial direction of the winding shaft 23, and the length of the through hole 201 is adapted to the length of the winding shaft 23. At this time, an annular support platform 7 is also provided on the inner wall of the housing 20 for supporting the turntable 21. The support platform 7 abuts against the edge of the right side surface of the turntable 21 to ensure the smoothness and stability of the rotation structure of the turntable 21. Furthermore, for example; Figure 6 As shown, multiple turntable protrusions 210 extend circumferentially from the outer wall of the turntable 21. A limiting adjustment member 200, with one end outside the housing 20 and the other end abutting against and limiting the turntable protrusions 210, is pivotally connected to the housing 20. The outer side of the turntable protrusions 210 is arc-shaped. The multiple turntable protrusions 210 are evenly spaced circumferentially from the outer wall of the turntable 21. The housing 20 is provided with mounting holes corresponding to the outer wall of the turntable 21. The limiting adjustment member 200 is a V-shaped locking block, with one end outside the housing 20 and the other end inside the housing 20, and is installed in the mounting hole. The rotating shaft has the same axial direction as the turntable 21. The limiting adjustment member 200 has an adjustment through hole at the top corner of the V-shaped structure. The rotating shaft is fixedly installed in the adjustment through hole. The limiting adjustment member 200 can rotate relative to the rotating shaft. At the same time, a V-shaped torsion spring is sleeved on the rotating shaft, with its two ends correspondingly connected to the limiting adjustment member 200 and the rotating shaft. The end of the limiting adjustment member 200 inside the housing 20 can be dynamically engaged between the turntable protrusions 210. When the end of the limiting adjustment member 200 outside the housing 20 is pressed towards the housing 20, the limiting adjustment member 200 is disengaged from the turntable protrusions 210.

[0028] Further improvements, such as Figure 1 and Figure 2 As shown, the first connector 4 extends out from the side wall of the housing 1. The test line 3 has a stop 8 outside the housing 1 at one end connected to the first connector 4. This makes it convenient to use. The stop 8 also prevents the first connector 4 from being retracted into the housing 1 when the line is retracted. The stop 8 is spherical and its diameter is larger than the diameter of the through hole in the housing. To protect the first connector 4 when not in use, a side wall groove 10 is provided on the outer side wall of the housing 1 for placing the first connector 4 and the stop block 8. A cover plate 11 is provided on the side wall groove 10, and the housing through hole is located at the bottom of the side wall groove 10. In this way, the first connector 4 and the stop block 8 can be hidden in the side wall groove 10 when not in use, which facilitates transportation and avoids the first connector 4 from being deformed by collision during transportation. When in use, the cover plate 11 can be opened. Alternatively, the cover plate 11 can be pivotally connected to the housing 1 on one side using a hinge, and the other side of the cover plate 11 and the outer side wall of the housing 1 can be provided with hooks and grooves that can engage with each other, so that the cover plate 11 can be placed on the side wall groove 10 when not in use.

[0029] Although the present invention has been described in detail above with general description and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A portable transformer testing adapter box, characterized in that, The application relates to a box body, which is internally provided with a plurality of automatic line winders, each of which is wound with a test line, the test lines on the automatic line winders are different in color, one end of each test line is connected with a first connector for being connected with a mutual inductor, and the other end is connected with a second connector for being connected with a mutual inductor tester, and the second connector and the test line are integrated.

2. The portable transformer testing switchgear of claim 1, wherein, The second connector and the test line are provided with a display device.

3. The portable transformer testing switchgear of claim 2, wherein, The display device is a liquid crystal screen, and the liquid crystal screen and the test line are provided with an AC contactor.

4. The portable transformer testing switchgear of claim 1, wherein, The second connector comprises an electrically-conductive insertion pin for insertion, an insulating seat arranged at the tail of the insertion pin, and a ring-shaped nut threadedly connected with the insertion pin, the nut is threadedly connected with the insertion pin at a position adjacent to the insulating seat, and the head of the insertion pin penetrates through the nut.

5. The portable transformer testing switchgear of claim 4, wherein, A nut protrusion is extended on the outer side wall of the nut.

6. The portable transformer testing switchgear of claim 1, wherein, The automatic line winder comprises a shell, a rotating disc rotatably arranged in the shell, two winding springs for driving the rotating disc to rotate, the winding springs being connected with the shell and the rotating disc at two ends, a winding shaft coaxial with the rotating disc and arranged on the surface of the rotating disc away from the winding spring and used for winding the test line, and a conductive ring and a conductive contact point arranged between the winding shaft and the shell and used for electrically connecting the test line and the second connector and capable of being rotatably matched.

7. The portable transformer tester adapter box of claim 6, wherein, A plurality of rotating disc protrusions are extended on the outer side wall of the rotating disc along the circumferential direction of the rotating disc, and the shell is pivotally connected with a limiting adjusting member, one end of the limiting adjusting member being arranged outside the shell and the other end being capable of abutting against the rotating disc protrusion for limiting.

8. The portable transformer testing switchgear of claim 6, wherein, An annular supporting table for supporting the rotating disc is further arranged on the inner wall of the shell.

9. The portable transformer testing switchgear of claim 1, wherein, The first connector penetrates through the side wall of the box body, and the test line is sleeved with a stopper arranged outside the box body at the end connected with the first connector.

10. The portable transformer testing switchgear of claim 9, wherein, A side wall groove for placing the first connector and the stopper is arranged on the outer side wall of the box body, and a cover plate is arranged on the side wall groove.

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