A color-changing and easy-to-observe current transformer open-circuit overvoltage protection device

Abstract

The present invention discloses a color-changing and easy-to-observe current transformer open-circuit overvoltage protection device, comprising: a current transformer body, and secondary terminals are arranged on both sides of the bottom of the current transformer body; a first protection mechanism comprises: an overvoltage protection plate, and the overvoltage protection plate is fixed to the middle of the current transformer body; a zinc oxide block, and the outer walls of the zinc oxide block and the overvoltage protection plate are coated with a color-changing coating, and viewing mechanisms are arranged at both ends of the zinc oxide block, and a second protection mechanism is arranged at the bottom of the current transformer body, and a clamping mechanism is arranged on both sides between the current transformer body and the second protection mechanism. The present invention facilitates the color reaction of the color change agent under high pressure through the arrangement mode of cooperating with the first protection mechanism and the second protection mechanism, and facilitates direct judgment when a short circuit occurs in the current transformer body, reduces the accident rate, and improves the installation efficiency through the clamping mechanism.

Description

Technical Field

[0001] The invention relates to the field of power system safety protection, and in particular to a color-changing and easy-to-observe current transformer open-circuit overvoltage protection device. Background Art

[0002] When the secondary circuit of the current transformer is open, we must first prevent the secondary winding from being open and endangering the equipment and personal safety. Find out the location of the open circuit and try to short-circuit the open circuit. During the short-circuiting process, we must pay attention to safety and pay attention to whether there is abnormal high voltage in the open secondary circuit.

[0003] Application No. 201620169048.X discloses a current transformer secondary open circuit overvoltage protection device, including: a thyristor protection module and a measurement control module for signal measurement and control protection action, the thyristor protection module includes: a BT136 thyristor connected in parallel to the secondary load end of the current transformer; the measurement control module includes: an output photoelectric coupler, an input photoelectric coupler, an RS trigger and a bridge rectifier, the bridge rectifier is connected to a varistor, a filter capacitor, a voltage regulator and a second current limiting resistor in sequence; the input photoelectric coupler is connected to the R end of the RS trigger, the output end of the RS trigger is connected to the BT136 thyristor via the output photoelectric coupler, and the output end of the RS trigger is also connected to an alarm module. The above-mentioned device measures the overvoltage at both ends of the load circuit in real time and completes the protection action. It can short-circuit the circuit generating overvoltage and issue an early warning within an extreme time. However, when a high voltage short circuit occurs in the current transformer, maintenance personnel cannot directly see from the appearance whether the current transformer is short-circuited. In addition, the existing current transformer and overvoltage protector are generally connected separately. Direct inspection of the current transformer is prone to misjudgment, resulting in an increased incidence of accidents. In addition, the current transformer and overvoltage protector need to be installed separately when fixed, and the installation is time-consuming. Summary of the invention

[0004] The object of the present invention is to provide a current transformer open circuit overvoltage protection device which can change color and is easy to observe, so as to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a color-changing and easy-to-observe current transformer open-circuit overvoltage protection device, comprising: a current transformer body, both sides of the bottom of the current transformer body are fixedly connected with secondary terminals;

[0006] A first protection mechanism is provided at the bottom of the current transformer body, and the first protection mechanism comprises:

[0007] An overvoltage protection board, wherein the overvoltage protection board is fixed to the middle part of the current transformer body;

[0008] A zinc oxide block is fixed to the bottom of the current transformer body, the outer walls of the zinc oxide block and the overvoltage protection plate are coated with a color-changing coating, viewing mechanisms are provided at both ends of the zinc oxide block, a second protection mechanism is provided at the bottom of the current transformer body, and clamping mechanisms are provided on both sides between the current transformer body and the second protection mechanism.

[0009] Preferably, the viewing mechanism includes:

[0010] A receiving assembly, the receiving assembly being rotated at an end of the current transformer body;

[0011] A pulling assembly, wherein the pulling assembly is disposed in the inner cavity of the receiving assembly;

[0012] A plurality of rotating columns, wherein the plurality of rotating columns are respectively arranged on two sides of the bottom of the storage component;

[0013] A plurality of fixing plates, two adjacent fixing plates are fixed to the outer wall of one end of the current transformer body, and the rotating column is rotatably interlaced with the middle part of the adjacent fixing plates.

[0014] Preferably, the storage assembly comprises:

[0015] A storage box, the storage box is rotated on one side of the current transformer body, the two ends of the zinc oxide block are respectively connected to the bottom of the two storage boxes by sliding and interlacing, and the two adjacent rotating columns are respectively fixed to the two sides of the bottom of the storage box;

[0016] A plurality of first viewing holes, wherein the plurality of first viewing holes are respectively opened on two sides of the storage box;

[0017] A plurality of second viewing holes are respectively opened on two sides facing each other and sandwiched by two sides of the storage box.

[0018] Preferably, the pulling assembly comprises:

[0019] A movable plate, the movable plate slides in the inner cavity of the storage box;

[0020] A U-shaped tube, the U-shaped tube is fixedly inserted into the bottom of the moving plate;

[0021] A plurality of tension springs, wherein the plurality of tension springs are fixed to two ends of the top of the movable plate, and the top of the tension springs is fixed to the inner cavity of the storage box;

[0022] A plurality of limiting rods are vertically sleeved in the inner cavity of the tension spring.

[0023] Preferably, the plurality of limit rods are respectively fixed to the top inner wall of the storage box, and the limit rods are slidably and interlacedly connected with the ends of the U-shaped tubes.

[0024] Preferably, the second protection mechanism comprises:

[0025] A secondary overvoltage protector, wherein the secondary overvoltage protector is arranged below the current transformer body;

[0026] A plurality of card slots, wherein the plurality of card slots are respectively arranged on both sides of the top of the secondary overvoltage protector, and the card connection mechanism is arranged in the inner cavity of the card slot;

[0027] A plurality of movable grooves, wherein the movable grooves are provided on the top of the inner wall of the card slot;

[0028] A plurality of pulling grooves are provided, wherein the pulling grooves are arranged on one side of the top of the secondary overvoltage protector.

[0029] Preferably, the pulling groove is communicated with the inner cavity of the movable groove, and the movable groove is a semicircular groove.

[0030] Preferably, the clamping mechanism comprises:

[0031] A connecting assembly, wherein the connecting assembly is arranged on one side of the bottom of the current transformer body;

[0032] A positioning component, which is arranged in the inner cavity of the movable groove and is used for limiting the position of the connecting component;

[0033] A pull rope is slidably and interlacedly connected with the inner cavity of the pulling groove, and two adjacent pull ropes are fixedly connected.

[0034] Preferably, the connection assembly comprises:

[0035] A slide groove, wherein two slide grooves are respectively arranged on two sides of the bottom of the current transformer body;

[0036] A connecting plate, the top of which is slidably connected to the inner cavity of the slide slot, and the connecting plate is slidably and interlacedly connected to the inner cavity of the card slot;

[0037] A sliding rod, the sliding rod is fixed to the inner wall of the sliding groove in a horizontal direction, and the sliding rod is slidably connected with the top of the connecting plate;

[0038] A compression spring is sleeved in the inner cavity of the slide rod and fixed between the connecting plate and the inner wall of the slide groove.

[0039] Preferably, the positioning component comprises:

[0040] A rotating rod, wherein the rotating rod is fixed to the inner wall of the movable groove;

[0041] A positioning block, the positioning block is rotatably inserted into the middle part of the rotating rod, and the positioning block is rotatably connected to the inner cavity of the movable groove;

[0042] A positioning groove, wherein the positioning groove is provided at the bottom of the adjacent connecting plate, and the positioning block is slidably engaged with the inner cavity of the adjacent positioning groove;

[0043] A connecting block is fixed to the top outer wall of an adjacent positioning block, and the connecting block is fixedly connected to one end of an adjacent pull rope.

[0044] Technical effects and advantages of the present invention:

[0045] (1) The present invention adopts a configuration mode in which the first protection mechanism and the second protection mechanism are coordinated, and the color-changing coating on the zinc oxide block and the outer wall of the overvoltage protection plate facilitates the color change agent to react under high pressure, facilitates direct judgment when a short circuit occurs in the current transformer body, reduces the accident rate, and improves the convenience of installation between the current transformer body and the second protection mechanism through the clamping mechanism, thereby improving the installation efficiency;

[0046] (2) The present invention adopts a setting method in which the viewing mechanism and the clamping mechanism are coordinated. Through the setting of the viewing mechanism, after the current transformer is installed, the operator can make color judgment on the first protection mechanism from the front, top or side of the current transformer body, thereby improving the efficiency of short-circuit inspection and judgment. Through the clamping mechanism, the disassembly and assembly between the current transformer body and the second protection mechanism are convenient, and the installation of the current transformer body and the second protection mechanism only requires the installation of the secondary overvoltage protector on the second protection mechanism, thereby reducing the installation time and avoiding the inconvenience of maintenance caused by the separate installation of the current transformer body and the second protection mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0048] Figure 2 It is a schematic diagram of the overall front cross-sectional structure of the present invention.

[0049] Figure 3 For the present invention Figure 1 Schematic diagram of the local enlarged structure at point A in the middle.

[0050] Figure 4 It is a schematic diagram of the overall structure of the movable plate of the present invention.

[0051] Figure 5 For the present invention Figure 2 Schematic diagram of the local enlarged structure at point B in the middle.

[0052] Figure 6 For the present invention Figure 2 Schematic diagram of the partial enlarged structure at point C in the middle.

[0053] In the figure: 1. current transformer body; 2. secondary terminal; 3. first protection mechanism; 31. overvoltage protection plate; 32. zinc oxide block; 4. viewing mechanism; 41. storage assembly; 411. storage box; 412. first viewing hole; 413. second viewing hole; 42. pulling assembly; 421. moving plate; 422. U-shaped tube; 423. tension spring; 424. limit rod; 43. rotating column; 44. fixed plate; 5. second protection mechanism; 51. secondary overvoltage protector; 52. card slot; 53. movable slot; 54. pulling slot; 6. card connection mechanism; 61. connecting assembly; 611. slide slot; 612. connecting plate; 613. slide rod; 614. compression spring; 62. positioning assembly; 621. rotating rod; 622. positioning block; 623. positioning slot; 624. connecting block; 63. pull rope. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] The present invention provides Figure 1-6 The current transformer open circuit overvoltage protection device shown in the figure can change color and is easy to observe, comprising: a current transformer body 1, both sides of the bottom of the current transformer body 1 are fixedly connected with secondary terminals 2, the current transformer body 1 is composed of a shell and a coil, and is used for current test induction;

[0056] Furthermore, a first protection mechanism 3 is provided at the bottom of the current transformer body 1, and the first protection mechanism 3 includes: an overvoltage protection plate 31 and a zinc oxide block 32, the overvoltage protection plate 31 is fixed to the middle of the current transformer body 1, the overvoltage protection plate 31 is fixed to the secondary terminal 2, the overvoltage protection plate 31 is made of zinc oxide insulating material, the zinc oxide block 32 is fixed to the bottom of the current transformer body 1, and the zinc oxide block 32 is an annular belt structure. The zinc oxide main body material of the overvoltage protection plate 31 and the zinc oxide block 32 has high dielectric strength, low leakage current and good Aging resistance: under high voltage, the resistance suddenly drops, short-circuiting the current transformer; under low voltage, the resistance reaches the insulation level, which does not affect the normal measurement of the current transformer. The outer walls of the zinc oxide block 32 and the overvoltage protection plate 31 are coated with a color-changing coating, which is a high-voltage color-changing agent. When the zinc oxide insulating material is subjected to high-voltage breakdown, the color-changing agent will react quickly, causing the color of the insulating material to change significantly, and the color change of the color-changing coating is obvious and reversible. When the voltage is reduced, it can return to its original color within a few minutes, providing intuitive protection action instructions for the staff;

[0057] Further, both ends of the zinc oxide block 32 are provided with a viewing mechanism 4, and the viewing mechanism 4 includes: a storage component 41, a pulling component 42, a plurality of rotating columns 43 and a plurality of fixed plates 44, the storage component 41 rotates at the end of the current transformer body 1, the pulling component 42 is arranged in the inner cavity of the storage component 41, and the plurality of rotating columns 43 are respectively arranged on both sides of the bottom of the storage component 41, and two adjacent fixed plates 44 are fixed to the outer wall of one end of the current transformer body 1, and the rotating column 43 is rotatably interlaced with the middle part of the adjacent fixed plate 44, and the storage component 41 can be rotated between the two adjacent fixed plates 44 through the rotating column 43;

[0058] Specifically, the storage assembly 41 includes: a storage box 411, a plurality of first viewing holes 412 and a plurality of second viewing holes 413. The storage box 411 rotates on one side of the current transformer body 1. The two ends of the zinc oxide block 32 are respectively connected to the bottom of the two storage boxes 411 by sliding and interlacing. Two adjacent rotating columns 43 are respectively fixed to the two sides of the bottom of the storage box 411, so that the storage box 411 can be set in a vertical direction or in a horizontal direction. The plurality of first viewing holes 412 are respectively opened on the two sides of the storage box 411, and the plurality of second viewing holes 413 are respectively opened on the two sides sandwiched and facing each other by the two sides of the storage box 411. Through the first viewing holes 412 and the second viewing holes 413, it is convenient to check the color of the zinc oxide block 32 in the inner cavity of the storage box 411 from the side, the top and the front, so as to improve the convenience of identifying the short circuit of the current transformer body 1.

[0059] Specifically, the pulling assembly 42 includes: a moving plate 421, a U-shaped tube 422, a plurality of tension springs 423 and a plurality of limit rods 424. The moving plate 421 slides in the inner cavity of the storage box 411. The U-shaped tube 422 is fixedly inserted into the bottom of the moving plate 421. The plurality of tension springs 423 are fixed to the two ends of the top of the moving plate 421. The top of the tension spring 423 is fixed to the inner cavity of the storage box 411. The limit rod 424 is vertically sleeved in the inner cavity of the tension spring 423. The plurality of limit rods 424 are respectively fixed to the storage box 411. The top inner wall of the storage box 411, the limit rod 424 and the end of the U-shaped tube 422 are slidably connected, and the limit rod 424 improves the stability of the use of the tension spring 423, and the end of the zinc oxide block 32 is inserted and sleeved with the inner cavity of the U-shaped tube 422, so that when the storage box 411 is horizontally turned, the zinc oxide block 32 can be bent at the end of the current transformer body 1 through the elasticity of the tension spring 423, and the end of the zinc oxide block 32 will not be pulled and damaged, thereby improving the stability of the use of the zinc oxide block 32;

[0060] Further, a second protection mechanism 5 is provided at the bottom of the current transformer body 1, and the second protection mechanism 5 includes: a secondary overvoltage protector 51, a plurality of card slots 52, a plurality of movable slots 53 and a plurality of pulling slots 54. The secondary overvoltage protector 51 is provided below the current transformer body 1. The secondary overvoltage protector 51 is a secondary overvoltage protector of the current transformer, which is used for abnormal overvoltage protection of the secondary side of the current transformer, so as to facilitate the secondary protection of the current transformer body 1. The plurality of card slots 52 are respectively provided on both sides of the top of the secondary overvoltage protector 51, and the card slot 52 is an L-shaped slot structure. The movable slot 53 is provided on the top of the inner wall of the card slot 52, and the pulling slot 54 is provided on one side of the top of the secondary overvoltage protector 51. The pulling slot 54 is communicated with the inner cavity of the movable slot 53, and the movable slot 53 is a semicircular slot.

[0061] Further, a clamping mechanism 6 is provided on both sides between the current transformer body 1 and the second protection mechanism 5. The clamping mechanism 6 is provided in the inner cavity of the clamping groove 52. The clamping mechanism 6 includes: a connecting component 61, a positioning component 62 and a pull rope 63. The connecting component 61 is provided on one side of the bottom of the current transformer body 1. The positioning component 62 is provided in the inner cavity of the movable groove 53. The positioning component 62 is used for limiting the connection component 61. The pull rope 63 is slidably interlaced with the inner cavity of the pulling groove 54. The two adjacent pull ropes 63 are fixedly connected, which is convenient for pulling the two fixed pull ropes 63 at the same time, so that the pull rope 63 can slide stably in the inner cavity of the pulling groove 54.

[0062] Specifically, the connecting component 61 includes: a slide groove 611, a connecting plate 612, a slide rod 613 and a compression spring 614. The two slide grooves 611 are respectively opened on both sides of the bottom of the current transformer body 1. The top of the connecting plate 612 is slidably connected to the inner cavity of the slide groove 611. The connecting plate 612 is slidably connected to the inner cavity of the card slot 52. The slide rod 613 is fixed to the inner wall of the slide groove 611 in a horizontal direction. The slide rod 613 is slidably connected to the top of the connecting plate 612. The compression spring 614 is sleeved in the inner cavity of the slide rod 613. The compression spring 614 is fixed between the connecting plate 612 and the inner wall of the slide groove 611. Through the elastic push of the compression spring 614, it is convenient for the connecting plate 612 to not slide randomly, so that the connection between the current transformer body 1 and the secondary overvoltage protector 51 is convenient.

[0063] Specifically, the positioning assembly 62 includes: a rotating rod 621, a positioning block 622, a positioning groove 623 and a connecting block 624. The rotating rod 621 is fixed to the inner wall of the movable groove 53, and the positioning block 622 is rotatably inserted into the middle of the rotating rod 621. The positioning block 622 has a cashew nut structure. The positioning block 622 is rotatably connected to the inner cavity of the movable groove 53. Through the self-gravity of the positioning block 622, the positioning block 622 can clamp the connecting plate 612, so that the connecting plate 612 will not slide out of the clamping groove 52 at will. The inner cavity of the positioning groove 623 is opened at the bottom of the adjacent connecting plate 612, the positioning block 622 is slidably engaged with the inner cavity of the adjacent positioning groove 623, the connecting block 624 is fixed to the top outer wall of the adjacent positioning block 622, and the connecting block 624 is fixedly connected to one end of the adjacent pull rope 63. By pulling the pull rope 63, the positioning block 622 is conveniently pulled out of the inner cavity of the positioning groove 623, so that the position limitation of the connecting plate 612 is released, and the current transformer body 1 and the secondary overvoltage protector 51 are conveniently disassembled and assembled.

[0064] Working principle of the present invention:

[0065] By squeezing two adjacent connecting plates 612, the connecting plates 612 can be inserted into the inner cavity of the adjacent card slot 52. By pulling the pull rope 63, the positioning block 622 is pulled out of the inner cavity of the positioning slot 623. After the pull rope 63 is released, the connecting plates 612 will not slide out of the inner cavity of the card slot 52 at will due to the gravity of the positioning block 622. This facilitates the disassembly and assembly of the current transformer body 1 and the secondary overvoltage protector 51. The installation of the current transformer body 1 and the second protection mechanism 5 only requires the installation of the secondary overvoltage protector 51 on the second protection mechanism 5, which reduces the installation time and avoids the inconvenience of maintenance caused by the separate installation of the current transformer body 1 and the second protection mechanism 5.

[0066] Through the first viewing hole 412, the second viewing hole 413 and direct observation of the front of the overvoltage protection plate 31, after the current transformer is installed, its operator can make color judgment on the first protection mechanism 3 from the front, top or side of the current transformer body 1, thereby improving the efficiency of short-circuit inspection and judgment. Through the color-changing coating on the outer wall of the zinc oxide block 32 and the overvoltage protection plate 31, the color-changing agent reacts under high voltage, which facilitates direct judgment when a short circuit occurs in the current transformer body 1, reduces the accident rate, and improves the protection performance of the current transformer body 1.

[0067] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A color-changing and easy-to-observe current transformer open-circuit overvoltage protection device, comprising: A current transformer body (1), wherein both sides of the bottom of the current transformer body (1) are fixedly connected with secondary terminals (2); It is characterized in that a first protection mechanism (3) is provided at the bottom of the current transformer body (1), and the first protection mechanism (3) comprises: An overvoltage protection plate (31), wherein the overvoltage protection plate (31) is fixed to the middle part of the current transformer body (1); A zinc oxide block (32), the zinc oxide block (32) being fixed to the bottom of the current transformer body (1), the outer walls of the zinc oxide block (32) and the overvoltage protection plate (31) being coated with a color-changing coating, viewing mechanisms (4) being provided at both ends of the zinc oxide block (32), a second protection mechanism (5) being provided at the bottom of the current transformer body (1), and clamping mechanisms (6) being provided on both sides between the current transformer body (1) and the second protection mechanism (5); The viewing mechanism (4) comprises: A storage assembly (41), wherein the storage assembly (41) is rotated at an end of the current transformer body (1); A pulling assembly (42), wherein the pulling assembly (42) is disposed in the inner cavity of the storage assembly (41); A plurality of rotating columns (43), wherein the plurality of rotating columns (43) are respectively arranged on two sides of the bottom of the storage component (41); A plurality of fixed plates (44), two adjacent fixed plates (44) being fixed to the outer wall of one end of the current transformer body (1), and the rotating column (43) being rotatably interlaced with the middle portion of the adjacent fixed plates (44); The pulling assembly (42) comprises: A movable plate (421), wherein the movable plate (421) slides in the inner cavity of the storage box (411); A U-shaped tube (422), wherein the U-shaped tube (422) is fixedly inserted into the bottom of the movable plate (421), and the end of the zinc oxide block (32) is inserted and sleeved into the inner cavity of the U-shaped tube (422); A plurality of tension springs (423), wherein the plurality of tension springs (423) are fixed to two ends of the top of the movable plate (421), and the top of the tension springs (423) is fixed to the inner cavity of the storage box (411); A plurality of limit rods (424), wherein the limit rods (424) are vertically sleeved in the inner cavity of the tension spring (423), and the plurality of limit rods (424) are respectively fixed to the top inner wall of the storage box (411), and the limit rods (424) are slidably interlaced with the end of the U-shaped tube (422); The clamping mechanism (6) comprises: A connecting component (61), wherein the connecting component (61) is arranged on one side of the bottom of the current transformer body (1); A positioning component (62), the positioning component (62) being arranged in the inner cavity of the movable groove (53), and the positioning component (62) being used for limiting the position of the connecting component (61); A pull rope (63), wherein the pull rope (63) is slidably connected to the inner cavity of the pulling groove (54), and two adjacent pull ropes (63) are fixedly connected; The connection assembly (61) comprises: A slide groove (611), wherein two slide grooves (611) are respectively arranged on two sides of the bottom of the current transformer body (1); A connecting plate (612), the top of which is slidably connected to the inner cavity of the slide groove (611), and the connecting plate (612) is slidably interlaced with the inner cavity of the card slot (52); A sliding rod (613), wherein the sliding rod (613) is fixed to the inner wall of the sliding groove (611) in a horizontal direction, and the sliding rod (613) is slidably interlaced with the top of the connecting plate (612); A compression spring (614), wherein the compression spring (614) is sleeved in the inner cavity of the slide rod (613), and the compression spring (614) is fixed between the connecting plate (612) and the inner wall of the slide groove (611); The positioning assembly (62) comprises: A rotating rod (621), wherein the rotating rod (621) is fixed to the inner wall of the movable groove (53); A positioning block (622), the positioning block (622) is rotatably inserted into the middle of the rotating rod (621), and the positioning block (622) is rotatably connected to the inner cavity of the movable groove (53); A positioning groove (623), wherein the positioning groove (623) is provided at the bottom of the adjacent connecting plate (612), and the positioning block (622) is slidably engaged with the inner cavity of the adjacent positioning groove (623); A connecting block (624), wherein the connecting block (624) is fixed to the top outer wall of the adjacent positioning block (622), and the connecting block (624) is fixedly connected to one end of the adjacent pull rope (63).

2. The color-changing and easy-to-observe current transformer open-circuit overvoltage protection device according to claim 1 is characterized in that: The storage assembly (41) comprises: A storage box (411), the storage box (411) is rotated on one side of the current transformer body (1), the two ends of the zinc oxide block (32) are respectively slidably connected with the bottom of the two storage boxes (411), and the two adjacent rotating columns (43) are respectively fixed on the two sides of the bottom of the storage box (411); A plurality of first viewing holes (412), wherein the plurality of first viewing holes (412) are respectively opened on two sides of the storage box (411); A plurality of second viewing holes (413) are respectively provided on two sides facing each other and sandwiched by two sides of the storage box (411).

3. The color-changing and easy-to-observe current transformer open-circuit overvoltage protection device according to claim 1 is characterized in that: The second protection mechanism (5) comprises: A secondary overvoltage protector (51), wherein the secondary overvoltage protector (51) is arranged below the current transformer body (1); A plurality of card slots (52), wherein the plurality of card slots (52) are respectively disposed on both sides of the top of the secondary overvoltage protector (51), and the card connection mechanism (6) is disposed in the inner cavity of the card slots (52); A plurality of movable grooves (53), wherein the movable grooves (53) are formed on the top of the inner wall of the clamping groove (52); A plurality of pulling grooves (54) are provided, wherein the pulling grooves (54) are provided on one side of the top of the secondary overvoltage protector (51).

4. The color-changing and easy-to-observe current transformer open-circuit overvoltage protection device according to claim 3 is characterized in that: The pulling groove (54) is in communication with the inner cavity of the movable groove (53), and the movable groove (53) is a semicircular groove.

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