Primary wire assembly device and method for verification of bus-type low-voltage current transformer

Abstract

The invention discloses a primary wire assembly device and method for verification of a bus-type low-voltage current transformer, and relates to the technical field of current transformer detection. When a low-voltage current transformer is calibrated, a plurality of primary wires with different specifications need to be prepared and are manually replaced, the replacement process consumes human resources, the working efficiency is reduced, and safety accidents are easily caused. The device comprises a wire preparation device, a sliding base, a crimping mechanism and a bottom plate, a wire preparation groove is formed in the wire preparation device, a wire assembly conductive strip is arranged in the wire preparation groove, a wire pressing device is arranged on the crimping mechanism, a wire assembly table is arranged on the sliding base, and the crimping mechanism is fixedly connected with a primary loop of the verification equipment in series; automatic wire assembling is achieved through automatic calculation and motor control. Primary wires of different specifications do not need to be prepared, resource waste is avoided, operation is simplified, safety risks caused by manual repeated taking, placing, carrying and installing of heavy primary wires are avoided, and work efficiency and safety are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of current transformer detection, and in particular to a primary conductor assembly device and method for testing a busbar type low-voltage current transformer. Background Art

[0002] Directly measuring high currents in low-voltage AC distribution networks is difficult, and the rated voltage of common installed energy meters generally does not exceed 100A. Therefore, special transformers are often used to convert high currents into lower currents. The conversion device used is called a current transformer. The advantages of using an instrument transformer include isolating the measuring instrument from high voltage, ensuring the safety of the instrument and personnel; expanding the instrument's measurement range, facilitating instrument standardization; and reducing energy consumption during measurement. Therefore, instrument transformers are widely used. For users with low-voltage power supply and high currents exceeding 100A, the use of low-voltage current transformers to expand the meter's measurement range is a necessary choice.

[0003] Since the metering point of the on-site power distribution device is usually on the entrance busbar, the low-voltage current transformers above 100A currently used in China usually adopt the busbar type, that is, the secondary winding and the iron core are made into a ring, and a hole is left in the middle for the primary winding wire to pass through. Generally speaking, the larger the primary rated current of the busbar-type low-voltage current transformer, the larger the center aperture size. Taking Q / GDW1572 as an example: when the rated current is 75A-150A, the center aperture is a circle with a diameter of 30mm; when the rated current is 200A-500A, the center aperture is a circle with a diameter of 40mm; when the rated current is 600A-800A, the center aperture is a rectangle of 84mm×30mm; when the rated current is 1000A-1500A, the center aperture is a rectangle of 104mm×50mm.

[0004] The electricity metering systems for large users are closely linked to the interests of both the power supply company and the user. If the instrument transformer is inaccurate, significant losses will result. Therefore, to ensure accurate metering, the instrument transformer must be inspected for inaccuracy before installation. This inspection requires the instrument transformer to be connected in series to the primary circuit. Because different instrument transformer specifications have different primary currents, the required primary conductor diameters for connecting the transformers vary significantly. Larger diameter conductors cannot be used in series with transformers with lower primary currents. Conversely, the conductors will have insufficient current-carrying capacity, which can easily lead to heat damage. Therefore, they cannot be used universally, requiring the preparation of multiple primary conductors of varying specifications, resulting in a waste of resources. The appropriate primary conductor must be manually calculated before verification or calibration, and must be replaced manually, a process that consumes manpower and reduces work efficiency. Furthermore, the primary conductors for large-size current transformers can weigh over 10 kg. The repeated manual handling, handling, and installation of these conductors requires significant physical effort and poses the risk of falls and injuries. It is easy to miscalculate the conductor cross-section during manual line selection, which may result in the primary conductor being unable to penetrate the transformer under test, and even cause safety accidents such as conductor overheating. Summary of the Invention

[0005] The technical problem to be solved and the technical task to be addressed by the present invention are to improve and enhance existing technical solutions by providing a primary conductor assembly device and method for busbar-type low-voltage current transformer calibration, with the goal of reducing calibration costs and improving work efficiency and safety. To this end, the present invention adopts the following technical solutions.

[0006] The primary wire assembly device for testing busbar-type low-voltage current transformers includes a wire preparation device, a sliding base, a crimping mechanism and a base plate. The wire preparation device is uprightly arranged on the rear side of the base plate and can be rotated forward from an upright state to a horizontal state. The upper end of the wire preparation device is provided with a wire preparation groove, the notch of the wire preparation groove faces forward, and the wire preparation groove passes through in the left and right directions. The wire preparation groove is provided with a plurality of detachable left and right wire assembly conductive strips. There are two sets of crimping mechanisms, which are respectively arranged at the left and right ends of the base plate. The crimping mechanism is provided with a wire pressing groove, the notch of the wire pressing groove is located at the front side, and the wire pressing groove passes through in the left and right directions. The crimping mechanism is provided with a wire pressing device for tightening and fixing the wire assembly conductive strips. The sliding base can slide back and forth, and the sliding base is provided with a wire assembly platform. The wire assembly platform corresponds to the bottom of the wire preparation device in the horizontal state, and the table top of the wire assembly platform and the lower end surface of the wire pressing groove are at the same height. The crimping mechanism is fixed in series with the primary circuit of the testing equipment. The wire preparation trough is equipped with matrix-type binary arrangement of wire-forming conductive bars. When the primary conductor is assembled, the wire preparation device is flipped over, and the wire is assembled on the wire assembly platform according to the number of combined wire-forming conductive bars required for the primary conductor cross-section. This avoids the traditional situation of manual wire selection for primary conductors and the need to prepare primary conductors of different specifications, thus avoiding waste of resources and simplifying operations. It avoids the manual repeated placement, handling and installation of heavy primary conductors, which requires high physical strength of the operator and has the risk of falling and injuring people, effectively improving work efficiency and safety.

[0007] As a preferred technical approach, the wire-forming conductive bars are rectangular in cross-section and tightly arranged in a rectangular array within a rectangular wire preparation trough. A wire-forming mechanism is used between the wire-forming platform and the wire preparation device to remove the wire-forming conductive bars from the trough and form the wires. The densely packed rectangular cross-section not only improves electrical conductivity but also facilitates the connection and securing operations of the wire-forming mechanism.

[0008] As a preferred technical means: the wire assembly mechanism includes two groups of screws, the two groups of screws are respectively a lower screw group provided on the wire assembly platform and an upper screw group provided on the wire preparation device. The screw positions of the upper screw group and the lower screw group correspond one to one, and the wire assembly conductive strip is provided with through screw holes corresponding to the screw positions. When the wire preparation device is in a horizontal state, the lower screw group and the upper screw group are both upright, and the screws of the lower screw group and the upper screw group can be screwed into the corresponding through screw holes on the wire assembly conductive strip and docked through the docking interface provided on the screw head. The lower end of the screw of the lower screw group is connected to the drive motor provided under the wire assembly platform through a transmission assembly. The rotation of the screw of the lower screw group is driven by the drive motor to achieve docking and vertical rotation of the screw of the upper screw group, thereby realizing the transfer of connection control rights of the spirally connected wire assembly conductive strips, and realizing automatic wire assembly.

[0009] As a preferred technical means, the docking interface adopts a cross-type mortise and tenon structure. The cross-type mortise and tenon structure can be set at the end of the smaller screw. After the cross-type mortise and tenon structure is matched, it can withstand the large lateral force of the spiral rotation. Driven by the drive motor, the lower and upper screw groups can be moved up or down synchronously.

[0010] As a preferred technical means: the left and right sides of the sliding base are provided with slide rail assemblies. This facilitates the forward and backward sliding of the sliding base. The slide rails of the slide rail assembly are generally provided on the left and right sides of the sliding base, and match with the slide groove blocks of the slide rail assembly fixed on other structures on the two outer sides to realize the sliding structure.

[0011] As a preferred technical means, the lower end of the wire preparation device is rotatably connected and driven by a motor, and the sliding base is moved forward and backward by the motor and transmission assembly. By driving the wire preparation device to rotate and the sliding base to slide, automatic wire preparation device rotation and sliding base movement operation can be achieved.

[0012] As a preferred technical measure, the wire crimping trough, wire assembly platform, and wire crimping device are all made of insulating materials. The use of insulating materials can prevent leakage of primary wires and effectively improve safety.

[0013] As a preferred technical means: the surface of the group wire conductive strip is provided with an anti-oxidation layer. Since the surface is in electrical contact with other structures, it is prone to contact oxidation. Anti-oxidation treatment of the surface can effectively prevent oxidation of the contact surface.

[0014] The working method of the primary conductor assembly device for testing a busbar type low-voltage current transformer comprises the following steps: 1) When the transformer verification equipment needs to start verification, pull the sliding base forward; 2) The motor drives the rotating wire preparation device to a horizontal state, so that the wire assembly conductive strips in the wire preparation trough are located above the wire assembly platform; 3) Calculate the cross-sectional area of the conductor corresponding to the rated primary current of the transformer to be tested, and calculate the row and column binary number (n) of the conductive strips according to the cross-sectional area and the rectangular arrangement of the conductive strips. x ,n y ); 4) The driving motor is based on the calculated row and column binary number of the group line conductive strip (n x ,n y ) drives the corresponding screw of the lower screw group to rotate upward, and makes the lower screw group dock with the upper screw group through the docking interface, and then continues to rotate upward, so that the screw of the lower screw group is connected to the calculated row and column binary number (n x ,n y ), at this time, the number of screws connected to the upper screw group is the total number of group wire conductive strips minus the number of connections of the lower screw group; 5) The motor drives the rotating wire preparation device to the retracted state, and the transformer under test is connected in series with the assembled primary conductor. The sliding base is moved backward, so that the two ends of the wire-forming conductive strips on the wire-forming platform are moved backward into the wire pressing groove, and the wire pressing device presses the wire-forming conductive strips downward; 6) Control the crimping mechanism to thread the primary conductor into the transformer's calibration / test circuit, allowing the transformer calibration equipment to perform subsequent calibration. This method effectively automates the wiring of the primary conductor, eliminating the need for manual wiring and further improving work efficiency and safety.

[0015] As a preferred technical means: in step 3), the row and column binary number (n x ,n y ) calculation includes the following steps: 301) Assuming the transformer aperture length Dx and width Dy, and the transformer rated primary current corresponds to the minimum conductor cross-sectional area S, calculate the minimum number of conductor bars connected to the standby group line (m): ; 302) If , then execute step 307), and have: ; 303) If ,but:

[0016] like , then execute step 306), otherwise execute step 307); 304) If ,but:

[0017] like , then execute step 306), otherwise execute step 307); 305) If , then proceed to the next step; 306) An alarm is issued, indicating that the set transformer specification information is incorrect, and subsequent steps are stopped and reset is awaited; 307) Control the drive motor to drive n x Column screw rise d y n y , n x ×n y Each group of conductive strips is a primary conductor.

[0018] Beneficial effects: The device and method realize automatic grouping of primary conductors without manual line selection and grouping, avoiding the situation that traditional primary conductors need frequent line selection, and there is no need to prepare primary conductors of different specifications, thus avoiding waste of resources and simplifying operation. It avoids the situation that manual repeated placement, handling and installation of heavier primary conductors require high physical strength of operators and there is a risk of falling and injuring people, effectively improving work efficiency and safety; it realizes automatic calculation of the required cross-section of the primary conductor and the automatic calculation of the number of rows and columns of conductive strips for grouping, avoiding the easy miscalculation of the conductor cross-section during manual line selection calculation, thereby avoiding the risk of the primary conductor being unable to penetrate the transformer under test, and preventing the occurrence of safety accidents such as conductor overheating, thereby better improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the 3D structure of the present invention in the verification state.

[0020] Figure 2 It is a schematic diagram of the main view of the verification state of the present invention.

[0021] Figure 3 It is a top view schematic diagram of the present invention in the verification state.

[0022] Figure 4 It is a schematic side view of the present invention in the verification state.

[0023] Figure 5 This invention Figure 3 Enlarged schematic diagram of part A in the middle.

[0024] In the figure: 1. Wire preparation device; 2. Sliding base; 3. Crimping mechanism; 4. Bottom plate; 5. Wire assembly conductive strip; 6. Wire crimper; 7. Wire assembly platform; 8. Lower screw group; 9. Upper screw group; 10. Cross mortise and tenon structure; 11. Slide rail assembly; 12. Drive motor; 13. Transformer. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is further described in detail below with reference to the accompanying drawings.

[0026] like Figure 1-5As shown, a primary conductor assembly device for testing a busbar-type low-voltage current transformer comprises a wire preparation device 1, a sliding base 2, a crimping mechanism 3 and a bottom plate 4. The wire preparation device 1 is vertically arranged on the rear side of the bottom plate 4 and can be rotated forward from an upright state to a horizontal state. A wire preparation slot is provided at the upper end of the wire preparation device 1. The slot of the wire preparation slot faces forward and the wire preparation slot passes through in the left and right directions. A plurality of detachable left and right assembly conductive strips 5 are provided in the wire preparation slot. The assembly conductive strips 5 are tightly arranged in the wire preparation slot in a binary array, and the assembly conductive strips 5 are flush with the end face of the slot. There are two sets of crimping mechanisms 3, which are respectively arranged at the left and right ends of the bottom plate 4. The left and right ends of the sliding base 2 are provided with a vertically penetrating square. shaped slot hole, the crimping mechanism 3 is located in the slot hole, and the slot hole is relatively long in the front-to-back direction, so that the sliding base 2 will not interfere with or collide with the crimping mechanism 3 when moving forward and backward. The crimping mechanism 3 is provided with a wire crimping groove, the notch of the wire crimping groove is located on the front side, and the wire crimping groove passes through the left and right directions. The crimping mechanism 3 is provided with a wire crimper 6 for clamping and fixing the wire assembly conductive strip 5. The sliding base 2 can slide forward and backward, and the sliding base 2 is provided with a wire assembly platform 7. The wire assembly platform 7 corresponds to the bottom of the horizontal wire preparation device 1. The wire assembly platform 7 and the wire preparation device 1 are both located in the middle of the left and right directions of the device. The table top of the wire assembly platform 7 and the lower end face of the wire crimping groove are at the same height, and the crimping mechanism 3 is fixed in series with the primary circuit of the calibration equipment.

[0027] To facilitate the connection, fixation, and assembly of the wire assembly mechanism, the wire assembly conductive bars 5 are rectangular in cross-section and tightly arranged in a rectangular array within the rectangular preparation trough. The wire assembly mechanism removes the wire assembly conductive bars 5 from the preparation trough and assembles the wires between the assembly platform 7 and the preparation device 1. The densely packed rectangular cross-section not only improves electrical conductivity but also facilitates the connection, fixation, and assembly of the wire assembly mechanism.

[0028] In order to realize automatic wire assembly, the wire assembly mechanism includes two groups of screws, which are respectively a lower screw group 8 provided on the wire assembly platform 7 and an upper screw group 9 provided on the wire preparation device 1. The screw positions of the upper screw group 9 and the lower screw group 8 correspond one to one, and the wire assembly conductive strip 5 is provided with a through screw hole corresponding to the screw position. When the wire preparation device 1 is in a horizontal state, the lower screw group 8 and the upper screw group 9 are both upright, and the screws of the lower screw group 8 and the upper screw group 9 can be screwed into the corresponding through screw holes on the wire assembly conductive strip 5 and docked through the docking interface provided on the screw head. The lower end of the screw of the lower screw group 8 is connected to the drive motor 12 provided under the wire assembly platform 7 through a transmission assembly. The rotation of the screw of the lower screw group 8 is driven by the drive motor 12 to realize the docking and vertical rotation movement of the screw of the upper screw group 9, thereby realizing the transfer of the connection control right of the spirally connected wire assembly conductive strip 5, and realizing automatic wire assembly.

[0029] To achieve docking of the lower screw assembly 8 and the upper screw assembly 9, a cross-type mortise and tenon structure 10 is used at the docking interface. The cross-type mortise and tenon structure 10 can be set at the end of the smaller screw. After the cross-type mortise and tenon structure 10 is matched, it can withstand the large lateral force of the spiral rotation. Driven by the drive motor 12, the lower screw assembly 8 and the upper screw assembly 9 can be moved up or down synchronously.

[0030] To achieve the slidable structure of the sliding base 2, the sliding base 2 is provided with a slide rail assembly 11 on both sides. The slide rails of the slide rail assembly 11 are arranged on the left and right sides of the sliding base 2 and match with the slide groove blocks of the slide rail assembly 11 fixed on the two outer sides of the sliding base 2. This sliding structure is widely used and has a stable and reliable structure. It can easily achieve the forward and backward sliding of the sliding base 2, thus realizing a sliding structure.

[0031] To automatically control the rotation of the wire preparation device 1 and the movement of the sliding base 2, the lower end of the wire preparation device 1 is rotatably connected and driven by a motor, while the sliding base 2 moves back and forth via the motor and transmission assembly. By driving the wire preparation device 1 to rotate and the sliding base 2 to slide, the automatic rotation of the wire preparation device 1 and the movement of the sliding base 2 can be achieved.

[0032] In order to improve safety, the wire pressing trough, the wire assembly platform 7 and the wire pressing device 6 are all made of insulating materials. The use of insulating materials can prevent leakage of primary wires and effectively improve safety.

[0033] To prevent oxidation of the contact surface of the grouping conductive strip 5, an anti-oxidation layer is provided on the surface of the grouping conductive strip 5. Since the surface is in electrical contact with other structures, it is prone to contact oxidation. Anti-oxidation treatment can effectively prevent oxidation of the contact surface.

[0034] The device is usually in an idle state, at which time all the wire-forming conductive bars 5 are located in the wire preparation slots, the wire preparation device 1 and the sliding base 2 are in a retracted state, and when the mutual inductor testing equipment needs to start testing, the device enters the wire-forming state.

[0035] The working method of the primary conductor assembly device for testing a busbar type low-voltage current transformer includes the following steps: S1: When the transformer verification equipment needs to start verification, pull the sliding base 2 forward; S2: The motor drives the rotating wire preparation device 1 to a horizontal state, so that the wire assembly conductive bar 5 in the wire preparation trough is located above the wire assembly platform 7; S3: Calculate the cross-sectional area of the conductor corresponding to the rated primary current of the transformer to be tested, and calculate the row and column binary number (n) of the group line conductive bar 5 according to the cross-sectional area and the rectangular arrangement of the group line conductive bar 5. x ,n y ), the number of rows and columns of the conductive strip 5 (n x ,n y) calculation includes the following steps: S301: Assuming that the aperture length Dx and width Dy of the transformer 13 to be tested are equal, and the rated primary current of the transformer corresponds to the minimum conductor cross-sectional area S, calculate the minimum number of connected conductor bars 5 of the standby group wire in m: ; S302: If , then execute step S307, and have: ; S303: If ,but:

[0036] like , then execute step S306, otherwise execute step S307; S304: If ,but:

[0037] like , then execute step S306, otherwise execute step S307; S305: If , then proceed to the next step; S306: an alarm is issued, indicating that the set transformer specification information is incorrect, and subsequent steps are stopped and reset is waited; S307: Control the drive motor 12 to drive n x Column screw rise d y n y , n x ×n y 5 groups of conductive bars are primary conductors; S4: The driving motor 12 is driven according to the calculated row and column binary number (n x ,n y ) drives the corresponding screw of the lower screw group 8 to rotate upward, and makes the lower screw group 8 and the upper screw group 9 dock through the docking interface, and then continues to rotate upward, so that the screw of the lower screw group 8 is connected to the calculated row and column binary number (n x ,n y ), at this time, the number of screws connected to the upper screw group 9 is the total number of group wire conductive strips 5 minus the number of connections of the lower screw group 8; S5: The motor drives the rotating wire preparation device 1 to the retracted state, and the measured mutual inductor 13 is connected in series with the assembled primary conductor. The sliding base 2 moves backward, so that the two ends of the assembly wire conductive bar 5 on the assembly wire platform 7 move backward into the wire pressing groove, and the wire pressing device 6 presses the assembly wire conductive bar 5 downward; S6: Control the crimping mechanism 3 to connect the primary conductor in series with the transformer verification / detection circuit, and the transformer verification equipment will carry out subsequent verification work.

[0038] After the test is completed, the wire presser 6 moves upward to break away from the contact with the group wire conductive bar 5, and the sliding base 2 moves forward to move both ends of the group wire conductive bar 5 out of the wire pressing groove, and then all the transformers 13 under test are removed.

[0039] The wire preparation device 1 rotates to a horizontal state, so that the wire assembly conductive bar 5 on the wire assembly platform 7 enters the wire preparation groove, and the wire preparation device 1 is kept pressing the wire assembly platform 7. At this time, the screw ends of the lower screw group 8 and the upper screw group 9 are docked, and then the drive motor 12 is driven to rotate in the opposite direction to move the screw downward as a whole until the lower screw group 8 is separated from the wire assembly conductive bar 5, and the wire assembly conductive bar 5 is completely fixed on the upper screw group 9.

[0040] The wire preparation device 1 is rotated to an upright and retracted state, and the sliding base 2 is moved backward to a retracted state.

[0041] This device and its working method realize the automatic grouping of primary conductors, realize the automatic calculation of the required cross-section of the primary conductors and the automatic calculation of the number of rows and columns of the grouping conductive strips 5, without the need for manual line selection and grouping, avoiding the situation where traditional primary conductors need to be frequently manually selected and installed, and avoiding the situation where traditional manual line selection calculations easily lead to incorrect calculation of the conductor cross-section, thereby avoiding the primary conductor from being unable to penetrate the measured mutual inductor 13 or even causing safety accidents such as conductor overheating, reducing workload, and effectively improving work efficiency and safety.

[0042] In this embodiment, the group line conductive bar 5 is made of copper bar.

[0043] In this embodiment, the wire presser 6 is driven by a motor or a cylinder to press.

[0044] In this embodiment, the driving motor 12 is a stepping motor.

[0045] The primary conductor assembly device and method for testing a bus-type low-voltage current transformer shown above are specific embodiments of the present invention, which have embodied the outstanding substantive features and significant progress of the present invention. According to actual use needs and under the guidance of the present invention, equivalent modifications in shape, structure, etc. can be made to them, which are all within the scope of protection of this scheme.

Claims

1. A primary conductor assembly device for testing busbar-type low-voltage current transformers, characterized by: It includes a wire preparation device, a sliding base, a crimping mechanism and a base plate. The wire preparation device is uprightly arranged on the rear side of the base plate and can be rotated forward from an upright state to a horizontal state. A wire preparation groove is provided on the upper end of the wire preparation device, the groove of the wire preparation groove faces forward, and the wire preparation groove passes through in the left and right directions. A plurality of detachable left and right wire assembly conductive strips are provided in the wire preparation groove. There are two sets of crimping mechanisms, which are respectively arranged at the left and right ends of the base plate. The crimping mechanism is provided with a wire crimping groove, the groove of the wire crimping groove is located at the front side, and the wire crimping groove passes through in the left and right directions. A wire crimping device for clamping and fixing the wire assembly conductive strips is provided on the sliding base, which can slide back and forth. A wire assembly platform is provided on the sliding base, and the wire assembly platform corresponds to the bottom of the wire preparation device in the horizontal state. The table top of the wire assembly platform and the lower end face of the wire crimping groove are at the same height. The crimping mechanism is fixed in series with the primary circuit of the calibration equipment.

2. The primary conductor assembly device for testing a busbar-type low-voltage current transformer according to claim 1, characterized in that: The line-forming conductive bars are rectangular in cross-section and are closely arranged in a rectangular line preparation slot in a rectangular array. The line-forming conductive bars are separated from the line preparation slot and formed into lines by a line-forming mechanism between the line-forming platform and the line preparation device.

3. The primary conductor assembly device for testing a busbar-type low-voltage current transformer according to claim 2, characterized in that: The wire assembly mechanism includes two groups of screws, which are a lower screw group provided on the wire assembly platform and an upper screw group provided on the wire preparation device. The screw positions of the upper screw group and the lower screw group correspond one to one, and the wire assembly conductive bar is provided with through screw holes corresponding to the screw positions. When the wire preparation device is in a horizontal state, the lower screw group and the upper screw group are both upright, and the screws of the lower screw group and the upper screw group can be screwed into the corresponding through screw holes on the wire assembly conductive bar and docked through the docking interface provided on the screw head. The lower end of the screw of the lower screw group is connected to the drive motor provided under the wire assembly platform through a transmission assembly.

4. The primary conductor assembly device for testing a busbar-type low-voltage current transformer according to claim 3, characterized in that: The docking interface adopts a cross-type mortise and tenon structure.

5. The primary conductor assembly device for testing a busbar-type low-voltage current transformer according to claim 4, characterized in that: Slide rail assemblies are provided on the left and right sides of the sliding base.

6. The primary conductor assembly device for testing a busbar-type low-voltage current transformer according to claim 5, characterized in that: The lower end of the wire preparation device is rotatably connected and driven to rotate by a motor, and the sliding base is moved forward and backward by the motor and the transmission assembly.

7. The primary conductor assembly device for testing a busbar-type low-voltage current transformer according to claim 6, characterized in that: The wire pressing trough, wire assembly platform and wire pressing device are all made of insulating materials.

8. The primary conductor assembly device for testing a busbar-type low-voltage current transformer according to claim 7, characterized in that: An anti-oxidation layer is provided on the surface of the group wire conductive strip.

9. A method for operating a primary conductor assembly device for testing a busbar-type low-voltage current transformer according to any one of claims 1 to 8, characterized in that The following steps are involved: 1) When the transformer verification equipment needs to start verification, pull the sliding base forward; 2) The motor drives the rotating wire preparation device to a horizontal state, so that the wire assembly conductive strips in the wire preparation trough are located above the wire assembly platform; 3) Calculate the cross-sectional area of the conductor corresponding to the rated primary current of the transformer to be tested, and calculate the row and column binary number (n) of the conductive strips according to the cross-sectional area and the rectangular arrangement of the conductive strips. x ,n y ); 4) The driving motor is based on the calculated row and column binary number of the group line conductive strip (n x ,n y ) drives the corresponding screw of the lower screw group to rotate upward, and makes the lower screw group dock with the upper screw group through the docking interface, and then continues to rotate upward, so that the screw of the lower screw group is connected to the calculated row and column binary number (n x ,n y ), at this time, the number of screws connected to the upper screw group is the total number of group wire conductive strips minus the number of connections of the lower screw group; 5) The motor drives the rotating wire preparation device to the retracted state, and the transformer under test is connected in series with the assembled primary conductor. The sliding base is moved backward, so that the two ends of the wire-forming conductive strips on the wire-forming platform are moved backward into the wire pressing groove, and the wire pressing device presses the wire-forming conductive strips downward; 6) Control the crimping mechanism to connect the primary conductor into the transformer verification / detection circuit, and the transformer verification equipment will carry out subsequent verification work.

10. The operating method of the primary conductor assembly device for busbar type low-voltage current transformer verification according to claim 8, characterized in that: In step 3), the row and column binary number (n x ,n y ) calculation includes the following steps: 301) Assuming the transformer aperture length Dx and width Dy, and the transformer rated primary current corresponds to the minimum conductor cross-sectional area S, calculate the minimum number of conductor bars connected to the standby group line (m): ； 302) If , then execute step 307) and have: ； Among them, fix() represents the rounding function; 303) If ,but: like , then execute step 307), otherwise execute step 306); 304) If ,but: like , then execute step 307), otherwise execute step 306); 305) If , then proceed to the next step; 306) An alarm is issued, indicating that the set transformer specification information is incorrect, and subsequent steps are stopped and reset is awaited; 307) Control the drive motor to drive n x Column screw rise d y n y , n x ×n y Each group of conductive strips is a primary conductor.

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