A capacitance current tester

Abstract

This invention relates to the field of electrical testing equipment technology and discloses a capacitance current tester. The device includes a detection component, a testing component, and an auxiliary component. The testing component is disposed on the detection component, and the auxiliary component is disposed on the testing component. The detection component includes a detector body with a current interface. The testing component includes a test connector movably disposed on the current interface. One end of the test connector has a test lead, and one end of the test lead has a pin-shaped plug. The end of the pin-shaped plug away from the test lead has an alligator clip. This invention, through the coordinated operation of the detection component, testing component, and auxiliary component, effectively solves the problems of poor contact, non-adjustable clamping, low detection accuracy, and inconvenient operation found in existing capacitance current testers.

Description

Technical Field

[0001] This invention belongs to the field of electrical testing equipment technology, specifically a capacitance current tester. Background Technology

[0002] In my country's power system, the neutral point of the distribution network typically operates ungrounded. When a single-phase ground fault occurs, the current flowing through the fault point is primarily the capacitive current generated by the line-to-ground capacitance. Statistics show that a significant portion of power system faults are caused by excessive capacitive current during single-phase grounding, leading to arcing that cannot be extinguished spontaneously. Traditional methods for measuring capacitive current include the direct method using single-phase metallic grounding and the indirect method using an external capacitor. However, to avoid direct contact with primary equipment, which presents drawbacks such as dangerous testing, complex operation, and low efficiency, a method has emerged that injects a different frequency signal from the open delta side of the PT (voltage transformer) to measure the capacitive current.

[0003] For example, Chinese Patent Application No. 2019219492824 discloses a capacitance current tester, which includes a tester body and a housing. The upper surface of the housing has a receiving groove extending downward. Sliders are provided on both sides of the tester body. The side wall of the receiving groove is provided with a sliding groove corresponding to the slider. The slider is installed in the sliding groove and can move up and down. The design of the slider and sliding groove in this device allows the tester body to slide up and down in the receiving groove. In addition, the design of the elastic component will reduce some vibrations generated by the tester body during transportation, further protecting the tester body and preventing some of its internal components from loosening. However, the clamping force of the alligator sleeve clip relies entirely on the torsion spring and cannot be adjusted.

[0004] For example, Chinese patent application number 202321152680X discloses a capacitance current tester, which relates to the field of power equipment testing technology. The tester includes a main body, a switch, terminals and a display screen located on the surface of the main body. A storage component is provided on one side of the main body. The storage component includes a storage compartment. An equidistantly arranged mounting cavity A is fixedly connected to the inner side of the storage compartment. An equidistantly arranged support frame is fixedly connected to the surface of the storage compartment. A winding rod is connected to the inner side of the mounting cavity A. The device organizes and stores the test wires through the storage compartment and the winding rod, so that the test wires will not be tangled together. However, the connection between the pin plug and the alligator clip is mostly a simple plug-and-play structure, which is prone to loosening or falling off after long-term use.

[0005] Based on the above solutions, the connection between the pin plug and the alligator clip of the existing tester is mostly a simple plug-and-play structure, which is prone to loosening or falling off after long-term use, resulting in increased contact resistance or signal interruption, affecting measurement accuracy. The clamping force of the alligator clip relies entirely on the torsion spring and is not adjustable. For conductors of different specifications, it may result in excessive clamping that damages the terminals or excessive clamping that leads to poor contact. The anti-slip and wear-resistant properties of the clamping surface are insufficient, further affecting clamping stability. When encountering sudden situations such as overheating or arcing of the device under test, operators often find it difficult to quickly remove the alligator clip due to tension or inconvenience, posing a safety hazard. Summary of the Invention

[0006] To address the above problems, the present invention provides a capacitance current tester to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a capacitance current tester, comprising a detection component, a test component, and an auxiliary component, wherein the test component is disposed on the detection component, and the auxiliary component is disposed on the test component; The detection component includes a detector body, on which a current interface is provided; The test assembly includes a test connector, which is movably mounted on a current interface. One end of the test connector is provided with a test lead, one end of the test lead is provided with a pin-shaped plug, and the end of the pin-shaped plug away from the test lead is provided with an alligator clip. The auxiliary component includes an elastic bellows, which is disposed on the alligator sheath clamp. An air supply pipe is disposed on one side of the elastic bellows, and an elastic airbag is disposed at the end of the air supply pipe away from the elastic bellows. A clamping wear-resistant plate is disposed on the surface of the elastic airbag, and an anti-slip texture is disposed on the surface of the clamping wear-resistant plate.

[0008] Preferably, the pin-shaped plug includes a socket, one end of which is provided with a conductive pin, the surface of which is provided with a retaining ring, the interior of which is provided with a retaining groove adapted to the retaining ring, the surface of which is provided with a return spring, and the end of which is away from the retaining ring is fixedly connected to the socket.

[0009] Preferably, the retaining ring has an armature plate inside, the plug socket has an electromagnet inside, and the electromagnet is located at the end of the plug socket near the return spring. An insulating layer is provided between the retaining ring and the conductive pin.

[0010] Preferably, the alligator sheath clip includes an upper clip body and a lower clip body, which are hinged together. The upper clip body has an upper clamping tooth groove inside, and the elastic airbag is fixedly disposed inside the upper clamping tooth groove. The lower clip body has a lower clamping tooth groove inside, and an anti-slip pad is disposed inside the lower clamping tooth groove.

[0011] Preferably, a conductive adapter seat is provided at the end of the lower clamping body away from the lower clamping tooth groove, an installation groove is provided inside the lower clamping body, an elastic spring is provided inside the installation groove, a limit post is provided at the end of the elastic spring away from the installation groove, and a limit hole is provided at the position where the conductive adapter seat connects with the limit post.

[0012] Preferably, an electronic screen is provided on the surface of the detector body, and a printer is provided above the detector body corresponding to the position of the electronic screen. The electronic screen is used to display capacitance current detection data in real time, and the printer is used to print detection reports.

[0013] Preferably, the detector body is internally equipped with a signal acquisition module, a signal processing module, and a data storage module. The signal acquisition module is electrically connected to the current interface and is used to acquire the capacitance current signal. The signal processing module is used to amplify and filter the acquired signal. The data storage module is used to store the detection data and historical records.

[0014] Preferably, the surface of the elastic bellows is provided with an inflation valve, one end of which is equipped with a miniature inflation pump, and the output end of the miniature inflation pump is fixedly equipped with an inflation head that is connected to the inflation valve, and the inflation head is connected to the inflation valve.

[0015] Preferably, an exhaust pipe is provided at the end of the elastic corrugated pipe away from the gas supply pipe, and an exhaust hole is provided at the end of the exhaust pipe away from the elastic corrugated pipe.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention, by setting up an electromagnet and an armature plate to cooperate, allows the controller to increase the positive current during normal testing, generating a magnetic attraction force. This causes the conductive pin to automatically insert into the elastic conductive sleeve inside the conductive adapter, overcoming the force of the reset spring, thus achieving double fixation. This effectively solves the problem of poor contact caused by the loosening and detachment of the connection between the traditional pin plug and the alligator clip, significantly improving the stability of signal transmission and the accuracy of measurement results.

[0017] 2. This invention achieves closed-loop intelligent adjustment of the clamping force by incorporating an elastic airbag and pressure sensor within the upper clamping tooth groove of the alligator sheath clamp, along with a miniature air pump and controller. Based on the specifications of the conductor being tested and real-time pressure feedback, the airbag inflation can be precisely controlled to maintain the clamping force at a standard value. This ensures secure clamping, prevents slippage, and avoids damage to the surface of the conductor being tested due to excessive clamping force.

[0018] 3. In the event of an emergency such as smoke, sparking, or short circuit during testing, and when it is inconvenient to directly remove the alligator sleeve clamp, the controller can apply a reverse current. By utilizing the magnetic repulsion between the electromagnet and the armature plate, the conductive pin is quickly pushed to separate from the elastic conductive sleeve, thereby achieving electrical isolation of the test circuit. This automatic power-off mechanism responds quickly, requires no direct manual operation, and effectively prevents equipment damage and safety accidents. Attached Figure Description

[0019] Figure 1 This is a first-view schematic diagram of the overall structure of the present invention; Figure 2 This is a second-view schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram of the assembly structure of the alligator sheath clip and auxiliary components of the present invention; Figure 4 In this invention Figure 3 Enlarged view of point A; Figure 5 This is a partial cross-sectional schematic diagram of the conductive adapter structure of the present invention; Figure 6 In this invention Figure 5 Enlarged view of point B; Figure 7 This is a schematic diagram of the assembly structure of the alligator sheath clip and the pin-shaped plug of the present invention; Figure 8 In this invention Figure 7 Enlarged view of point C; Figure 9 This is a partial cross-sectional view of the connector structure of the present invention.

[0020] In the diagram: 1. Detection component; 101. Detector body; 102. Electronic screen; 103. Printer; 104. Current interface; 2. Test component; 201. Test connector; 202. Test lead; 203. Pin plug; 2031. Socket; 2032. Conductive pin; 2033. Snap ring; 2034. Return spring; 204. Alligator clip; 2041. Upper clamp; 2042. Lower clamp; 2043. Upper clamping tooth groove; 2044. Lower clamping tooth groove; 2045. Conductive adapter; 2046. Limiting post; 2047. Elastic spring; 2048. Anti-slip pad; 3. Auxiliary component; 301. Elastic bellows; 3011. Inflation valve; 302. Exhaust pipe; 303. Air supply pipe; 304. Elastic airbag; 305. Clamping wear-resistant plate. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] like Figures 1 to 9 As shown, a capacitance current tester of the present invention includes a detection component 1, a test component 2, and an auxiliary component 3. The test component 2 is disposed on the detection component 1 and is detachably and movably disposed on the detection component 1. The auxiliary component 3 is disposed on the test component 2 and is used to improve the clamping performance of the test component 2.

[0023] like Figure 2 As shown, the detection component 1 includes a detector body 101, a current interface 104 on the detector body 101 for connecting to the test component 2, an electronic screen 102 on the surface of the detector body 101, and a printer 103 above the detector body 101 corresponding to the position of the electronic screen 102. The electronic screen 102 is used to display the capacitance current detection data in real time, and the printer 103 is used to print the test report.

[0024] The detector body 101 is internally equipped with a signal acquisition module, a signal processing module and a data storage module. The signal acquisition module is electrically connected to the current interface 104 and is used to acquire the capacitance current signal. The signal processing module is used to filter and amplify the acquired signal. The data storage module is used to store the detection data and historical records.

[0025] like Figure 2As shown, the test component 2 includes a test connector 201, which is movably mounted on the current interface 104. One end of the test connector 201 is provided with a test lead 202, and one end of the test lead 202 is provided with a pin plug 203. The end of the pin plug 203 away from the test lead 202 is provided with an alligator clip 204.

[0026] It is worth noting that the test connector 201 is compatible with the current interface 104 and adopts a plug-in movable connection, which is smooth and easy to connect and disconnect quickly. One end of the test connector 201 is fixedly connected to the test lead 202 by crimping. The test lead 202 is covered with an insulating protective sleeve, which can effectively prevent leakage and ensure the personal safety of the operator. At the same time, the test lead 202 uses a shielded cable to avoid external interference signals from affecting the signal transmission of the test lead 202.

[0027] like Figures 3 to 5 As shown, the alligator sheath clip 204 includes an upper clip body 2041 and a lower clip body 2042, which are hinged together. The upper clip body 2041 is provided with an upper clamping tooth groove 2043, and the lower clip body 2042 is provided with a lower clamping tooth groove 2044. The lower clamping tooth groove 2044 is provided with an anti-slip pad 2048.

[0028] It is worth noting that the upper clamp 2041 and the lower clamp 2042 are hinged together by a hinge shaft, on which a torsion spring is fitted to provide basic clamping force. The upper clamping tooth groove 2043 and the lower clamping tooth groove 2044 are arranged opposite to each other to form a clamping space. In addition, the anti-slip pad 2048 is made of silicone and has fine anti-slip texture on its surface, which can further enhance the friction during clamping, prevent the test terminal from slipping, and protect the surface of the test terminal from damage.

[0029] like Figure 5 , Figure 6 As shown, a conductive adapter seat 2045 is provided at the end of the lower clamping body 2042 away from the lower clamping tooth groove 2044. An installation groove is provided inside the lower clamping body 2042. An elastic spring 2047 is provided inside the installation groove. A limit post 2046 is provided at the end of the elastic spring 2047 away from the installation groove. A limit hole is provided at the position where the conductive adapter seat 2045 connects with the limit post 2046.

[0030] It is worth noting that the conductive adapter 2045 is provided with an elastic conductive sleeve inside. When the pin plug 203 is assembled with the alligator clip 204, the conductive pin 2032 is inserted into and spreads open the elastic conductive sleeve inside the conductive adapter 2045. The elastic conductive sleeve holds the conductive pin 2032 tightly by its own elasticity.

[0031] like Figures 7 to 9As shown, the pin connector 203 includes a socket 2031. One end of the socket 2031 is provided with a conductive pin 2032. The conductive pin 2032 is made of high-conductivity copper material and has a silver-plated surface to ensure good conductivity. A retaining ring 2033 is provided on the surface of the conductive pin 2032. The socket 2031 has a groove inside that matches the retaining ring 2033. A return spring 2034 is provided on the surface of the retaining ring 2033. The end of the return spring 2034 away from the retaining ring 2033 is fixedly connected to the socket 2031.

[0032] The retaining ring 2033 has an armature plate inside, and the plug socket 2031 has an electromagnet inside. The electromagnet is located at one end of the plug socket 2031 near the return spring 2034. An insulating layer is provided between the retaining ring 2033 and the conductive pin 2032 to ensure electrical isolation.

[0033] When in use, the conductive pin 2032 is made of high-conductivity copper material and its surface is tin-plated. The tin plating layer can effectively prevent oxidation of the conductive pin 2032 surface, improve conductivity, reduce contact resistance, and ensure detection accuracy.

[0034] like Figure 3 , Figure 4 As shown, the auxiliary component 3 includes an elastic bellows 301, which is disposed on the alligator sheath clamp 204. An air supply pipe 303 is disposed on one side of the elastic bellows 301, and an elastic airbag 304 is disposed at the end of the air supply pipe 303 away from the elastic bellows 301. A clamping wear-resistant plate 305 is disposed on the surface of the elastic airbag 304, and an anti-slip texture is disposed on the surface of the clamping wear-resistant plate 305. The elastic airbag 304 is fixedly disposed inside the upper clamping tooth groove 2043.

[0035] like Figure 7 , Figure 8 As shown, an inflation valve 3011 is provided on the surface of the elastic bellows 301. A miniature inflation pump is installed at one end of the inflation valve 3011. An inflation head connected to the inflation valve 3011 is fixedly installed at the output end of the miniature inflation pump. The inflation head is connected to the inflation valve 3011.

[0036] An exhaust pipe 302 is provided at the end of the flexible corrugated pipe 301 away from the gas supply pipe 303, and an exhaust hole is provided at the end of the exhaust pipe 302 away from the flexible corrugated pipe 301.

[0037] In use, one end of the gas supply pipe 303 is connected to the interior of the elastic bellows 301, and the other end is connected to the elastic airbag 304. It is used to supply gas to the elastic airbag 304 and adjust the inflation volume of the elastic airbag 304. The inflation valve 3011 adopts a miniature one-way valve to prevent gas backflow.

[0038] In practical use, the connection between the pin plug 203 and the alligator clip 204 of existing testers is mostly a simple plug-and-play structure, which is prone to loosening or falling off after long-term use, leading to increased contact resistance or signal interruption, affecting measurement accuracy. The clamping force of the alligator clip 204 relies entirely on the torsion spring and is not adjustable. For conductors of different specifications, it may result in excessive clamping that damages the terminals or excessive clamping that leads to poor contact. The anti-slip and wear-resistant properties of the clamping surface are insufficient, further affecting clamping stability. When encountering sudden situations such as overheating or arcing of the device under test, operators often find it difficult to quickly remove the alligator clip 204 due to tension or inconvenience, posing a safety hazard. To solve this problem, the following measures are taken: In use, the alligator clip 204 is assembled with the pin plug 203. The conductive pin 2032 of the pin plug 203 is inserted into the conductive adapter 2045 of the alligator clip 204. At this time, one end of the plug socket 2031 of the pin plug 203 is engaged with the slot of the lower clip 2042, and the positioning protrusion of the plug socket 2031 is embedded in the positioning groove of the lower clip 2042 to form a limiting engagement and fixation, so as to prevent the plug socket 2031 from rotating or shaking during use. It is worth noting that at this time, the conductive pin 2032 has not yet come into contact with the elastic conductive sleeve inside the conductive adapter 2045.

[0039] It is worth noting that the outer side of the plug socket 2031 is provided with a positioning protrusion (not shown in the figure), and the inner wall of the slot of the lower clamp 2042 is provided with a corresponding positioning groove (not shown in the figure). The positioning protrusion and the positioning groove are matched to realize the circumferential positioning and axial positioning of the plug socket 2031, thereby improving the stability of the assembly of the alligator sheath clip 204 and the pin plug 203.

[0040] Turn on the power switch of the detector body 101, the electronic screen 102 starts up and displays the initial status of the device. Insert the test connector 201 of the test component 2 into the current interface 104 of the test component 1 to ensure a firm connection. Then, clamp the alligator clip 204 onto the conductor under test. The controller controls and increases the positive current input to the electromagnet inside the connector 2031, increasing the magnetic attraction of the electromagnet to the armature plate inside the retaining ring 2033. This causes the retaining ring 2033 to overcome the rebound force of the return spring 2034 and move the conductive pin 2032 toward the conductive adapter 2045. This allows the conductive pin 2032 to insert into and open the elastic conductive sleeve inside the conductive adapter 2045. The elastic conductive sleeve holds the conductive pin 2032 tightly by its own elasticity, achieving the purpose of fixing the conductivity. At the same time, the magnetic attraction between the electromagnet and the armature plate further enhances the stability of the connection and ensures reliable electrical contact.

[0041] As the conductive pin 2032 moves toward the conductive adapter 2045, it presses against the limiting post 2046, causing the elastic spring 2047 to be stretched. This causes the limiting post 2046 to move upward in the vertical direction, allowing the end of the limiting post 2046 away from the conductive pin 2032 to enter the exhaust hole of the exhaust pipe 302, thus achieving a seal.

[0042] Because the clamping wear-resistant plate 305 is equipped with a pressure sensor, the pressure on the conductor being tested on the back side is detected by the pressure sensor, and the clamping force of the alligator sheath clamp 204 on the conductor being tested can be determined. Then, the clamping force is adjusted by controlling the inflation of the elastic air bladder 304. Specifically, according to the specifications of the conductor being tested, the controller controls the micro air pump to inflate the elastic bellows 301. The gas enters the elastic air bladder 304 through the air supply pipe 303, causing the elastic air bladder 304 to expand and push the clamping wear-resistant plate 305 to press against the conductor being tested, so that the clamping wear-resistant plate 305 is in full contact with the conductor being tested, while avoiding damage to the conductor surface. The anti-slip pad 2048 in the lower clamping tooth groove 2044 contacts the other side of the conductor to prevent slippage. When the detection value of the pressure sensor reaches the standard value, the micro air pump is turned off to stop inflation.

[0043] During the process of inflating the elastic bellows 301, the amount of gas inside the elastic bellows 301 increases, causing the elastic bellows 301 to expand and deform. This increases the clamping force between the lower clamp 2042 and the upper clamp 2041 in the alligator sheath clamp 204, preventing the angle between the lower clamp 2042 and the upper clamp 2041 from opening excessively when an external force is applied downward to the upper clamp 2041. In other words, it effectively resists the downward force applied by the external force and prevents the clamping jaws between the lower clamp 2042 and the upper clamp 2041 from opening excessively, thus ensuring the long-term stability of the clamping posture during the test.

[0044] After clamping, the signal acquisition module acquires the capacitor current signal through the current interface 104, test lead 202, pin plug 203, and alligator clip 204. The acquired analog signal is transmitted to the signal processing module, and after filtering, amplification, and analog-to-digital conversion, it is converted into a digital signal and transmitted to the electronic screen 102 for real-time display. At the same time, it is transmitted to the data storage module for storage. After the test is completed, the test report can be printed through the printer 103 for easy archiving and review.

[0045] When the test ends, the controller stops supplying current to the electromagnet. Under the action of the reset spring 2034, the retaining ring 2033 drives the conductive pin 2032 to move away from the alligator clip 204, causing the conductive pin 2032 to separate from the elastic conductive sleeve inside the conductive adapter 2045 and return to its initial state. During this process, the squeezing force of the conductive pin 2032 on the limiting post 2046 disappears. Under the action of the elastic spring 2047, the limiting post 2046 moves downward in the vertical direction, thereby restoring the limiting post 2046 to its initial state, that is, the end of the limiting post 2046 away from the conductive pin 2032 separates from the exhaust hole of the exhaust pipe 302. Then, the gas inside the elastic airbag 304 is slowly discharged through the exhaust hole of the exhaust pipe 302, the clamping force decreases, the alligator clip 204 is released, and finally the power switch is turned off. The test component 2 is pulled out from the current interface 104, the test wire 202 and the alligator clip 204 are tidied up, and the test work is completed.

[0046] However, during current and capacitance testing, if any sudden situation occurs such as the tested device overheating, smoking, sparking, emitting an odor, or short circuits and abnormal parameter fluctuations, the alligator clip 204 should be immediately removed from the tested conductor to cut off the test circuit and avoid equipment damage or safety accidents. However, if it is inconvenient to directly remove the alligator clip 204 from the tested conductor in an emergency, the connection between the elastic conductive sleeve in the conductive adapter 2045 and the conductive pin 2032 can be quickly disconnected to quickly cut off the test circuit. Specifically, the controller controls and increases the reverse current input to the electromagnet inside the adapter 2031, increasing the magnetic repulsion force of the electromagnet on the armature plate inside the retaining ring 2033. The return spring 2034 is stretched. During this process, the retaining ring 2033 drives the conductive pin 2032 to move away from the alligator clip 204, thereby separating the conductive pin 2032 from the elastic conductive sleeve inside the conductive adapter 2045 and automatically disconnecting the conductivity. This eliminates the need for direct manual operation, improves safety, and effectively prevents equipment damage and safety accidents.

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A capacitance current tester, characterized in that: It includes a detection component (1), a test component (2), and an auxiliary component (3), wherein the test component (2) is disposed on the detection component (1), and the auxiliary component (3) is disposed on the test component (2); The detection component (1) includes a detector body (101), and a current interface (104) is provided on the detector body (101). The test assembly (2) includes a test connector (201), which is movably mounted on the current interface (104). One end of the test connector (201) is provided with a test lead (202), and one end of the test lead (202) is provided with a pin plug (203). The end of the pin plug (203) away from the test lead (202) is provided with an alligator clip (204). The auxiliary component (3) includes an elastic corrugated tube (301), which is disposed on the alligator sheath clamp (204). An air supply pipe (303) is disposed on one side of the elastic corrugated tube (301), and an elastic airbag (304) is disposed at the end of the air supply pipe (303) away from the elastic corrugated tube (301). A clamping wear-resistant plate (305) is disposed on the surface of the elastic airbag (304), and an anti-slip texture is disposed on the surface of the clamping wear-resistant plate (305).

2. The capacitance current tester according to claim 1, characterized in that: The pin connector (203) includes a socket (2031), one end of which is provided with a conductive pin (2032). The surface of the conductive pin (2032) is provided with a retaining ring (2033). The interior of the socket (2031) is provided with a retaining groove that is adapted to the retaining ring (2033). The surface of the retaining ring (2033) is provided with a return spring (2034). The end of the return spring (2034) away from the retaining ring (2033) is fixedly connected to the socket (2031).

3. The capacitance current tester according to claim 2, characterized in that: The retaining ring (2033) has an armature plate inside, the plug socket (2031) has an electromagnet inside, and the electromagnet is located at one end of the plug socket (2031) near the return spring (2034). An insulating layer is provided between the retaining ring (2033) and the conductive pin (2032).

4. The capacitance current tester according to claim 1, characterized in that: The alligator sheath clip (204) includes an upper clip body (2041) and a lower clip body (2042), which are hinged together. The upper clip body (2041) has an upper clamping tooth groove (2043) inside, and the elastic airbag (304) is fixedly disposed inside the upper clamping tooth groove (2043). The lower clip body (2042) has a lower clamping tooth groove (2044) inside, and the lower clamping tooth groove (2044) has an anti-slip pad (2048) inside.

5. A capacitance current tester according to claim 4, characterized in that: A conductive adapter (2045) is provided at one end of the lower clamping body (2042) away from the lower clamping tooth groove (2044). An installation groove is provided inside the lower clamping body (2042), and an elastic spring (2047) is provided inside the installation groove. A limit post (2046) is provided at one end of the elastic spring (2047) away from the installation groove. A limit hole is provided at the position where the conductive adapter (2045) connects with the limit post (2046).

6. A capacitance current tester according to claim 1, characterized in that: An electronic screen (102) is provided on the surface of the detector body (101). A printer (103) is provided above the detector body (101) corresponding to the position of the electronic screen (102). The electronic screen (102) is used to display the capacitance current detection data in real time, and the printer (103) is used to print the detection report.

7. A capacitance current tester according to claim 1, characterized in that: The detector body (101) is internally equipped with a signal acquisition module, a signal processing module and a data storage module. The signal acquisition module is electrically connected to the current interface (104) and is used to acquire capacitor current signals. The signal processing module is used to filter and amplify the acquired signals. The data storage module is used to store detection data and historical records.

8. A capacitance current tester according to claim 1, characterized in that: The surface of the elastic bellows (301) is provided with an inflation valve (3011). One end of the inflation valve (3011) is equipped with a miniature inflation pump. The output end of the miniature inflation pump is fixedly equipped with an inflation head that is connected to the inflation valve (3011), and the inflation head is connected to the inflation valve (3011).

9. A capacitance current tester according to claim 1, characterized in that: An exhaust pipe (302) is provided at the end of the elastic corrugated pipe (301) away from the gas supply pipe (303), and an exhaust hole is provided at the end of the exhaust pipe (302) away from the elastic corrugated pipe (301).

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