Portable double-circuit line mutual inductance tester device

Abstract

The portable double-circuit line mutual inductance tester device comprises a fixed box, a movable box, a movable wheel, a lifting platform and a testing mechanism, and the testing mechanism comprises an open current transformer, a stress plate, a rotating ring, a driving mechanism, an electric push rod, a non-contact voltage transformer, an excitation signal source, an electric control non-damage wire clamp, a display screen, a main control unit, a roller and a wire. The fixed box and the movable box can be separated, after the lifting platform can ascend to the position near the double-circuit line, an excitation signal source can inject signals into the double-circuit line, meanwhile, non-contact data collection can be carried out through the opening current transformer and the non-contact voltage transformer, electric wires do not need to be damaged during signal injection and data collection, and the detection efficiency is improved. And the lead in the movable box can be released under the action of the roller, so that wired connection between the electrical element of the fixed box and the main control unit is realized, and accuracy and timeliness of data transmission are ensured, thereby providing data support for construction and maintenance of the double-circuit line.

Description

Technical Field

[0001] The present invention relates to the technical field of power system equipment, in particular to a portable double-circuit line mutual inductance tester device. Background Art

[0002] With the expansion of the scale of power systems and the increase in the complexity of power grids, the application of double-circuit lines on the same tower and parallel transmission lines is becoming increasingly widespread. The mutual inductance effect caused by electromagnetic coupling in such lines may cause problems such as induced voltage and circulating current. In severe cases, it may lead to safety hazards such as false operation of relay protection and damage to equipment insulation. When constructing or repairing one of the lines, it is necessary to accurately test the mutual inductance parameters between the double-circuit lines to ensure the reliability of relay protection devices and other devices. The current double-circuit line mutual inductance testing methods are mostly implemented through high-altitude operations. After applying an excitation signal to the double-circuit line, the voltage and current data on the line are collected to calculate the mutual inductance parameters. However, high-altitude operations are dangerous, and the equipment used to collect data is installed on the side of the tower for a long time and is rarely maintained, resulting in a shortened lifespan and the accuracy of the collected voltage and current data cannot be guaranteed. Summary of the Invention

[0003] In view of this, the present invention proposes a portable double-circuit line mutual inductance tester device, which can be easily moved to different double-circuit lines to perform mutual inductance tests, improve test efficiency, accurately obtain test data, and provide a theoretical basis for the construction and maintenance of double-circuit lines.

[0004] The technical solution of the present invention is achieved as follows:

[0005] A portable double-circuit line mutual inductance tester device comprises a fixed box, a mobile box, a driving wheel, a lifting platform and a testing mechanism, wherein the opposite side walls of the fixed box and the mobile box are open, the open side of the fixed box and the open side of the mobile box are detachably connected, the driving wheel is arranged on the bottom surface of the fixed box and the mobile box, and the lifting platform is arranged on the top surface of the fixed box and the mobile box; the testing mechanism comprises an open current transformer composed of a transformer body and an arc-shaped rotating part, a force plate, a rotating ring, a driving mechanism, an electric push rod, a non-contact voltage transformer, an excitation signal source, an electrically controlled non-damageable wire clamp, a display screen, a main control unit, a roller and a wire, the transformer body is arranged on the lifting platform, the arc-shaped rotating part is rotatably connected to the transformer body, the force plate is arranged on the side wall of the arc-shaped rotating part, and the rotating ring is rotatably arranged on the lifting platform, and The rotation is driven by a driving mechanism, the transformer body is located on the inner side of the rotating ring, the electric push rod is arranged on the top surface of the rotating ring, the force plate and the arc-shaped rotating part are located above the moving path of the electric push rod, the excitation signal source and the electrically controlled damage-free wire clamp are arranged on the lifting platform on the top surface of the mobile box, the electrically controlled damage-free wire clamp is electrically connected to the excitation signal source, the display screen and the main control unit are arranged on the side wall of the mobile box away from the fixed box, the roller rotation is arranged in the mobile box, the wire is wound on the roller, one end of which is electrically connected to the main control unit, and the other end extends into the fixed box and is electrically connected to the lifting platform and the transformer body and driving mechanism on the lifting platform, and the main control unit is electrically connected to the transformer body, driving mechanism, electric push rod, non-contact voltage transformer, excitation signal source, electrically controlled damage-free wire clamp and display screen respectively.

[0006] Preferably, the load-bearing plate is arranged in an arc shape.

[0007] Preferably, the driving mechanism includes a bracket, a rotating motor, a gear and a rack. The bracket is arranged on the top surface of the lifting platform. The rotating motor is arranged on the bracket, and its output shaft is connected to the gear downward. The rack is circumferentially arranged along the outer circumference of the rotating ring. The gear is meshed with the rack. The main control unit is electrically connected to the rotating motor on the lifting platform above the mobile box, and the rotating motor on the lifting platform above the fixed box is electrically connected to the wire.

[0008] Preferably, an annular groove is provided on the lifting platform, and a slider is provided on the bottom surface of the rotating ring, and the slider is located in the annular groove.

[0009] Preferably, the testing mechanism also includes a hydraulic rod, a grounding body, a sharp portion and a spring grounding down lead. The hydraulic rod is arranged on the bottom surface of the fixed box, and its output shaft extends to the bottom of the fixed box and is connected to the top surface of the grounding body. The sharp portion is arranged on the bottom surface of the grounding body. The bottom end of the spring grounding down lead is electrically connected to the grounding body, and the top end extends upward to the lifting platform and is electrically connected to the electrically controlled non-damage wire clamp. The wire is electrically connected to the hydraulic rod.

[0010] Preferably, it also includes a quick-release mechanism, which includes an insertion rod, a metal rod, an electromagnet, a normally closed button and a battery pack. The insertion rod is arranged on the open side of the mobile box, and a limiting groove is provided on the top surface thereof. The open side of the fixed box is provided with a through cavity, and the top surface of the through cavity is provided with an accommodating cavity. The metal rod is located in the accommodating cavity, and the electromagnet is arranged on the top surface of the accommodating cavity and above the metal rod. The normally closed button is arranged on the top surface of the grounding body, and the battery pack is arranged on the bottom surface of the fixed box and forms a circuit with the normally closed button and the electromagnet.

[0011] Preferably, the quick-release mechanism further comprises a connecting rope, the top end of which is connected to the top surface of the accommodating cavity, and the bottom end of which is connected to the top end of the metal rod.

[0012] Preferably, the testing mechanism also includes a dual-axis motor and a U-shaped test line. The dual-axis motor is arranged on the top surface of the lifting platform, and its output shafts on both sides are connected to the ends of the U-shaped test line. The transformer body is located on the rotation path of the U-shaped test line. The excitation signal source is electrically connected to the U-shaped test line, and the main control unit is electrically connected to the dual-axis motor.

[0013] Preferably, the testing mechanism further comprises an electric turntable, which is relatively arranged on the inner wall of the moving box, with its rotating surface connected to the end surface of the roller, and the main control unit is electrically connected to the electric turntable.

[0014] Preferably, it further comprises a hand push rod, which is arranged on the side wall of the movable box away from the fixed box.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] ① The fixed box and the mobile box are detachably connected and can be moved synchronously. The fixed box can be fixed on the ground side of the outage line of the double-circuit line. After the mobile box is separated from the fixed box, it can be moved to the other side of the outage line. The open current transformer, non-contact voltage transformer and excitation signal source can be raised to the outage line and the operating line through the lifting platform to realize signal injection and data collection, so that the mutual inductance parameters can be quickly calculated, providing theoretical guidance for the construction and maintenance of double-circuit lines.

[0017] ② When the fixed box is separated from the mobile box, the drum can rotate to release the wire. Through the setting of the wire, the current transformer on the fixed box can be connected to the main control unit through wired data, ensuring the integrity and efficiency of data transmission. At the same time, the electronically controlled non-destructive wire clamp can be directly clamped on the outside of the line to achieve lossless signal input, and the open current transformer and non-contact voltage transformer can realize non-contact data collection to avoid damage to the line. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only preferred embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a structural schematic diagram of a portable double-circuit line mutual inductance tester device of the present invention;

[0020] Figure 2 This is a schematic top view of the structure of the testing mechanism on the top of the mobile box of the portable double-circuit line mutual inductance tester device of the present invention;

[0021] Figure 3 A schematic structural diagram of an open current transformer of a portable double-circuit line mutual inductance tester device according to the present invention;

[0022] Figure 4 This is a schematic diagram of the connection structure between the rotating ring and the lifting platform of the portable double-circuit line mutual inductance tester device of the present invention;

[0023] Figure 5 This is a schematic diagram of the connection structure between the fixed box and the mobile box of the portable double-circuit line mutual inductance tester device of the present invention;

[0024] In the figure, 1. fixed box; 2. mobile box; 3. driving wheel; 4. lifting platform; 5. transformer body; 6. arc-shaped rotating part; 7. open current transformer; 8. force plate; 9. rotating ring; 10. electric push rod; 11. non-contact voltage transformer; 12. excitation signal source; 13. electric control non-damage wire clamp; 14. display screen; 15. main control unit; 16. drum; 17. wire; 18. bracket; 19. rotating motor; 20. gear Wheel; 21. Rack; 22. Annular groove; 23. Slider; 24. Hydraulic rod; 25. Grounding body; 26. Sharp part; 27. Spring grounding down conductor; 28. Insert rod; 29. Metal rod; 30. Electromagnet; 31. Normally closed button; 32. Battery pack; 33. Limiting groove; 34. Passing cavity; 35. Accommodating cavity; 36. Connecting rope; 37. Dual-axis motor; 38. U-shaped test line; 39. Electric turntable; 40. Hand push rod. DETAILED DESCRIPTION

[0025] In order to better understand the technical content of the present invention, a specific embodiment is provided below, and the present invention is further described in conjunction with the accompanying drawings.

[0026] See also Figures 1 to 5The portable double-circuit line mutual inductance tester device provided by the present invention includes a fixed box 1, a mobile box 2, a driving wheel 3, a lifting platform 4 and a testing mechanism, the opposite side walls of the fixed box 1 and the mobile box 2 are open, the open side of the fixed box 1 and the open side of the mobile box 2 are detachably connected, the driving wheel 3 is arranged on the bottom surface of the fixed box 1 and the mobile box 2, and the lifting platform 4 is arranged on the top surface of the fixed box 1 and the mobile box 2; the testing mechanism includes an open current transformer 7 composed of a transformer body 5 and an arc-shaped rotating part 6, a force plate 8, a rotating ring 9, a driving mechanism, an electric push rod 10, a non-contact voltage transformer 11, an excitation signal source 12, an electrically controlled non-destructive wire clamp 13, a display screen 14, a main control unit 15, a roller 16 and a wire 17, the transformer body 5 is arranged on the lifting platform 4, the arc-shaped rotating part 6 is rotatably connected to the transformer body 5, the force plate 8 is arranged on the side wall of the arc-shaped rotating part 6, the rotating ring 9 is rotatably arranged on the lifting platform 4, and through the driving mechanism Driven to rotate, the transformer body 5 is located on the inner side of the rotating ring 9, the electric push rod 10 is arranged on the top surface of the rotating ring 9, the force plate 8 and the arc-shaped rotating part 6 are located above the moving path of the electric push rod 10, the excitation signal source 12 and the electrically controlled damage-free wire clamp 13 are arranged on the lifting platform 4 on the top surface of the mobile box 2, the electrically controlled damage-free wire clamp 13 is electrically connected to the excitation signal source 12, the display screen 14 and the main control unit 15 are arranged on the side wall of the mobile box 2 away from the fixed box 1, the roller 16 is rotatably arranged in the mobile box 2, the wire 17 is wound on the roller 16, one end of which is electrically connected to the main control unit 15, and the other end extends into the fixed box 1 and is electrically connected to the lifting platform 4 and the transformer body 5, non-contact voltage transformer 11 and the driving mechanism on the lifting platform 4, the main control unit 15 is electrically connected to the transformer body 5, the driving mechanism, the electric push rod 10, the non-contact voltage transformer 11, the excitation signal source 12, the electrically controlled damage-free wire clamp 13 and the display screen 14 respectively.

[0027] A portable double-circuit line mutual inductance tester device of the present invention is used to perform mutual inductance testing on double-circuit lines, wherein the double-circuit lines are divided into outage lines and operating lines, and the operations of the outage lines and the operating lines are different. The head end of the outage line needs to be connected to the excitation signal, and the end needs to be grounded, while the voltage and current signals need to be collected at both ends of the operating line and the head end of the outage line. The zero-sequence impedance of the outage line and the operating line can be calculated based on the collected data, and then the mutual impedance between the outage line and the operating line can be calculated based on the zero-sequence impedance. The mutual inductance parameters of the double-circuit lines can be obtained based on the mutual impedance, so as to facilitate the construction and repair and maintenance of new lines. In order to facilitate the mutual inductance testing of the double-circuit lines, the fixed box 1 and the mobile box 2 are set to a detachable form, and the fixed box 1 It can be placed at the grounding end of the power outage line, and the mobile box 2 can be moved to the head end of the power outage line. A lifting platform 4 is set on the top of the fixed box 1 and the mobile box 2. The lifting platform 4 can lift the excitation signal source 12, the open current transformer 7, and the non-contact voltage transformer 11 to the position of the line. The excitation signal source 12 is used to inject the excitation signal into the power outage line. When injecting the signal, it is directly clamped on the power outage line through the electrically controlled non-destructive wire clamp 13 to achieve lossless signal injection and avoid damaging the line. The open current transformer 7 and the non-contact voltage transformer 11 can collect the voltage and current signals of the power outage line and the operating line. The collected voltage and current signals can be transmitted to the main control unit 15, and the main control unit 15 calculates the mutual inductance parameters and displays them on the display screen 14.

[0028] For the open current transformer 7, it includes a transformer body 5 and an arc-shaped rotating part 6. The arc-shaped rotating part 6 is rotatably connected to the transformer body 5. A circular cavity is formed at the contact position. The circular cavity is used for the line to pass through, so that the mutual inductance current of the line can be collected. When the open current transformer 7 is lifted and lowered on the lifting platform 4, the open current transformer 7 is in an open state. At this time, one side of the arc-shaped rotating part 6 is connected to the transformer body 5, and rotates with the connection as the axis to form an opening in the open current transformer 7. In the vertical direction, the arc-shaped rotating part 6 extends to the outside of the transformer body 5. When the open current transformer 7 rises to the power outage line or the running line When the circuit is in operation, the electric push rod 10 can be extended upward, and after pushing the arc-shaped rotating part 6 to rotate upward, the arc-shaped rotating part 6 can be covered on the transformer body 5, so that the current data of the circuit can be collected, and the electric push rod 10 is set on the rotating ring 9, and can be driven to rotate by the driving mechanism, so that the electric push rod 10 rotates to the bottom of the force-bearing plate 8. When the current collection is completed, the electric push rod 10 can be raised again and push the force-bearing plate 8 upward, so that one side of the arc-shaped rotating part 6 is separated from one side of the transformer body 5, and the arc-shaped rotating part 6 is continuously pushed to rotate to the other side, thereby realizing the opening of the open current transformer 7, so that the lifting platform 4 can leave the corresponding circuit when it descends.

[0029] A roller 16 is provided in the mobile box 2, and a wire 17 is wound around the roller 16. When the mobile box 2 moves away from the fixed box 1, the roller 16 can rotate to continuously release the wire 17, thereby maintaining the electrical connection between the mobile box 2 and the fixed box 1, so that the main control unit 15 can receive the voltage and current data collected by the open current transformer 7 and the non-contact voltage transformer 11 on the fixed box 1 in a wired manner, thereby ensuring effective and stable data transmission.

[0030] Preferably, the load-bearing plate 8 is arranged in an arc shape.

[0031] When the output shaft of the electric push rod 10 extends upward, it will contact the bottom surface of the force-bearing plate 8. Since the force-bearing plate 8 is an arc-shaped structure, it can push the arc-shaped rotating part 6 to rotate, thereby opening the open current transformer 7.

[0032] Preferably, the driving mechanism includes a bracket 18, a rotating motor 19, a gear 20 and a rack 21. The bracket 18 is arranged on the top surface of the lifting platform 4. The rotating motor 19 is arranged on the bracket 18, and its output shaft is connected to the gear 20 downward. The rack 21 is circumferentially arranged along the outer circumference of the rotating ring 9. The gear 20 is engaged with the rack 21. The main control unit 15 is electrically connected to the rotating motor 19 on the lifting platform 4 above the mobile box 2, and the rotating motor 19 on the lifting platform 4 above the fixed box 1 is electrically connected to the wire 17.

[0033] The bracket 18 is used to support the rotating motor 19, which can drive the gear 20 to rotate. The gear 20 is used to drive the rack 21 to rotate, thereby realizing the rotation of the rotating ring 9 to adjust the position of the electric push rod 10, so that the open current transformer 7 can be closed and opened.

[0034] Preferably, an annular groove 22 is provided on the lifting platform 4 , and a slider 23 is provided on the bottom surface of the rotating ring 9 , and the slider 23 is located in the annular groove 22 .

[0035] When the rotating ring 9 rotates, the slider 23 can rotate along the annular groove 22 to ensure stable rotation.

[0036] Preferably, the testing mechanism also includes a hydraulic rod 24, a grounding body 25, a sharp portion 26 and a spring grounding down conductor 27. The hydraulic rod 24 is arranged on the bottom surface of the fixed box 1, and its output shaft extends to the bottom of the fixed box 1 and is connected to the top surface of the grounding body 25. The sharp portion 26 is arranged on the bottom surface of the grounding body 25. The bottom end of the spring grounding down conductor 27 is electrically connected to the grounding body 25, and the top end extends upward to the lifting platform 4 and is electrically connected to the electrically controlled non-damageable wire clamp 13. The wire 17 is electrically connected to the hydraulic rod 24.

[0037] The end of the power outage line needs to be grounded. When the fixed box 1 moves to the end of the power outage line, the hydraulic rod 24 is first started. The hydraulic rod 24 will drive the grounding body 25 to move downward, and finally the sharp part 26 can be inserted into the soil. When the lifting platform 4 on the fixed box 1 rises to the power outage line, the electrically controlled non-damaging wire clamp 13 can be clamped at the end of the power outage line. The electrically controlled non-damaging wire clamp 13, the spring grounding lead 27, the grounding body 25 and the sharp part 26 constitute a grounding mechanism, thereby achieving effective grounding of the power outage line. After the grounding body 25 is inserted into the soil through the sharp part 26, the fixed box 1 can be fixed. At this time, the movable box 2 can be separated from the fixed box 1, thereby moving the movable box 2 to the head end of the power outage line.

[0038] Preferably, a quick-release mechanism is also included, which includes an insertion rod 28, a metal rod 29, an electromagnet 30, a normally closed button 31 and a battery pack 32. The insertion rod 28 is arranged on the open side of the mobile box 2, and a limiting groove 33 is provided on the top surface thereof. The open side of the fixed box 1 is provided with a through cavity 34, and the top surface of the through cavity 34 is provided with a accommodating cavity 35. The metal rod 29 is located in the accommodating cavity 35, and the electromagnet 30 is arranged on the top surface of the accommodating cavity 35 and above the metal rod 29. The normally closed button 31 is arranged on the top surface of the grounding body 25, and the battery pack 32 is arranged on the bottom surface of the fixed box 1, and forms a circuit with the normally closed button 31 and the electromagnet 30.

[0039] In order to facilitate the separation of the fixed box 1 and the movable box 2, the present invention is provided with a quick-release mechanism. First, when the fixed box 1 and the movable box 2 are in a spliced state, the insertion rod 28 will extend into the through cavity 34, and the bottom end of the metal rod 29 will extend into the limit groove 33 at the top of the insertion rod 28 to lock the insertion rod 28. At this time, the fixed box 1 and the movable box 2 are a whole and can be moved at the same time. When the head end and the end end of the double-circuit line need to be connected, the fixed box 1 will be fixed at one end, and the hydraulic rod 24 will drive the grounding body 25 to move downward so that the sharp part 26 is inserted into the soil for fixation. When the grounding body 25 moves downward, the normally closed button 31 on its top loses pressure and returns to a closed state, so that the power of the battery pack 32 can be transmitted to the electromagnet 30. After the electromagnet 30 is energized, it can magnetically attract the metal rod 29, causing the bottom end of the metal rod 29 to leave the limiting groove 33 and retract the metal rod 29 as a whole into the accommodating cavity 35. At this time, the insertion rod 28 is in the unlocked state, and the movable box 2 can be easily separated from the fixed box 1, so that the movable box 2 can be pulled to the other side. When the mutual inductance test is completed, the movable box 2 can be moved back to the side of the fixed box 1, so that the insertion rod 28 extends into the through cavity 34, and the grounding body 25 is driven to rise. When the normally closed button 31 contacts the bottom surface of the fixed box 1, it is triggered to the open state, cutting off the circuit, and the electromagnet 30 loses power and cannot magnetically attract the metal rod 29. The metal rod 29 will fall into the limiting groove 33, thereby locking the metal rod 29.

[0040] Preferably, the quick release mechanism further includes a connecting rope 36 , the top end of which is connected to the top surface of the accommodating cavity 35 , and the bottom end of which is connected to the top end of the metal rod 29 .

[0041] The connecting rope 36 can prevent the metal rod 29 from falling too much, and ensure that the electromagnet 30 can effectively magnetically attract the metal rod 29.

[0042] Preferably, the testing mechanism also includes a dual-axis motor 37 and a U-shaped test line 38. The dual-axis motor 37 is arranged on the top surface of the lifting platform 4, and its output shafts on both sides are connected to the ends of the U-shaped test line 38. The transformer body 5 is located on the rotation path of the U-shaped test line 38, the excitation signal source 12 is electrically connected to the U-shaped test line 38, and the main control unit 15 is electrically connected to the dual-axis motor 37.

[0043] In order to ensure the accuracy and effectiveness of the actual mutual inductance test, the present invention is provided with a self-test mechanism, which can perform self-test on the excitation signal source 12, the open current transformer 7 and the non-contact voltage transformer 11. The dual-axis motor 37 can drive the U-shaped test line 38 to rotate, so that the U-shaped test line 38 rotates into the open current transformer 7, and then the excitation signal source 12 can inject an excitation signal into the U-shaped test line 38. The voltage and current data in the U-shaped test line 38 can be collected through the open current transformer 7 and the non-contact voltage transformer 11. The main control unit 15 can compare and determine whether the induced current and voltage collected by the open current transformer 7 and the non-contact voltage transformer 11 correspond to the excitation signal injected by the excitation model element.

[0044] Preferably, the testing mechanism further includes an electric turntable 39 , which is relatively arranged on the inner wall of the moving box 2 , with its rotating surface connected to the end surface of the roller 16 , and the main control unit 15 is electrically connected to the electric turntable 39 .

[0045] The electric turntable 39 can drive the roller 16 to rotate to realize the winding and releasing of the wire 17, and a junction box is also provided in the fixed box 1. The junction box is electrically connected to the wire 17 transmitted from the mobile box, and can branch the wires and electrically connect them to the electrical equipment in and above the fixed box 1.

[0046] Preferably, a hand push rod 40 is further included, and the hand push rod 40 is arranged on the side wall of the movable box 2 away from the fixed box 1.

[0047] The movable box 2 can be moved by the hand push rod 40 to perform separation and splicing.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Portable double-circuit line mutual inductance tester device, characterized in that, It includes a fixed box, a mobile box, a driving wheel, a lifting platform and a testing mechanism, the side walls of the fixed box and the mobile box are open, the open side of the fixed box and the open side of the mobile box are detachably connected, the driving wheel is arranged on the bottom surface of the fixed box and the mobile box, and the lifting platform is arranged on the top surface of the fixed box and the mobile box; the testing mechanism includes an open current transformer composed of a transformer body and an arc-shaped rotating part, a force plate, a rotating ring, a driving mechanism, an electric push rod, a non-contact voltage transformer, an excitation signal source, an electrically controlled non-damageable wire clamp, a display screen, a main control unit, a roller and a wire, the transformer body is arranged on the lifting platform, the arc-shaped rotating part is rotatably connected to the transformer body, the force plate is arranged on the side wall of the arc-shaped rotating part, the rotating ring is rotatably arranged on the lifting platform, and is driven to rotate by the driving mechanism. The transformer body is located on the inner side of the rotating ring, the electric push rod is arranged on the top surface of the rotating ring, the force plate and the arc-shaped rotating part are located above the moving path of the electric push rod, the excitation signal source and the electrically controlled damage-free wire clamp are arranged on the lifting platform on the top surface of the mobile box, the electrically controlled damage-free wire clamp is electrically connected to the excitation signal source, the display screen and the main control unit are arranged on the side wall of the mobile box away from the fixed box, the roller rotation is arranged in the mobile box, the wire is wound on the roller, one end of it is electrically connected to the main control unit, and the other end extends into the fixed box and is electrically connected to the lifting platform and the transformer body, non-contact voltage transformer and drive mechanism on the lifting platform, and the main control unit is electrically connected to the transformer body, drive mechanism, electric push rod, non-contact voltage transformer, excitation signal source, electrically controlled damage-free wire clamp and display screen respectively.

2. The portable double-circuit line mutual inductance tester device according to claim 1, characterized in that: The load-bearing plate is arranged in an arc shape.

3. The portable double-circuit line mutual inductance tester device according to claim 1, characterized in that: The driving mechanism includes a bracket, a rotating motor, a gear and a rack. The bracket is arranged on the top surface of the lifting platform. The rotating motor is arranged on the bracket, and its output shaft is connected to the gear downward. The rack is arranged circumferentially along the outer circumference of the rotating ring. The gear is meshed with the rack. The main control unit is electrically connected to the rotating motor on the lifting platform above the mobile box, and the rotating motor on the lifting platform above the fixed box is electrically connected to the wire.

4. The portable double-circuit line mutual inductance tester device according to claim 1, characterized in that: The lifting platform is provided with an annular groove, and the bottom surface of the rotating ring is provided with a slider, and the slider is located in the annular groove.

5. The portable double-circuit line mutual inductance tester device according to claim 1, characterized in that: The testing mechanism also includes a hydraulic rod, a grounding body, a sharp portion and a spring grounding down lead. The hydraulic rod is arranged on the bottom surface of the fixed box, and its output shaft extends to the bottom of the fixed box and is connected to the top surface of the grounding body. The sharp portion is arranged on the bottom surface of the grounding body. The bottom end of the spring grounding down lead is electrically connected to the grounding body, and the top end extends upward to the lifting platform and is electrically connected to the electrically controlled non-destructive wire clamp. The wire is electrically connected to the hydraulic rod.

6. The portable double-circuit line mutual inductance tester device according to claim 5, characterized in that: It also includes a quick-release mechanism, which includes an insertion rod, a metal rod, an electromagnet, a normally closed button and a battery pack. The insertion rod is arranged on the open side of the mobile box, and a limiting groove is provided on the top surface thereof. The open side of the fixed box is provided with a through cavity, and the top surface of the through cavity is provided with an accommodating cavity. The metal rod is located in the accommodating cavity, and the electromagnet is arranged on the top surface of the accommodating cavity and above the metal rod. The normally closed button is arranged on the top surface of the grounding body, and the battery pack is arranged on the bottom surface of the fixed box and forms a circuit with the normally closed button and the electromagnet.

7. The portable double-circuit line mutual inductance tester device according to claim 6, characterized in that: The quick-release mechanism further comprises a connecting rope, the top end of which is connected to the top surface of the accommodating cavity, and the bottom end of which is connected to the top end of the metal rod.

8. The portable double-circuit line mutual inductance tester device according to claim 1, characterized in that: The testing mechanism also includes a dual-axis motor and a U-shaped test line. The dual-axis motor is arranged on the top surface of the lifting platform, and its output shafts on both sides are connected to the ends of the U-shaped test line. The transformer body is located on the rotation path of the U-shaped test line. The excitation signal source is electrically connected to the U-shaped test line, and the main control unit is electrically connected to the dual-axis motor.

9. The portable double-circuit line mutual inductance tester device according to claim 1, characterized in that: The testing mechanism further comprises an electric turntable which is relatively arranged on the inner side wall of the moving box, with its rotating surface connected to the end surface of the roller, and the main control unit is electrically connected to the electric turntable.

10. The portable double-circuit line mutual inductance tester device according to claim 1, characterized in that: The utility model also comprises a hand push rod, which is arranged on a side wall of the mobile box away from the fixed box.

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