A control method for independently adjusting three-phase current of DC charging input of electric vehicle

Abstract

The present invention discloses a control method for independently adjustable three-phase current of direct current charging input of electric vehicles, and relates to the technical field of electric vehicle charging control. The technical problem to be solved by the present invention is: if the current of each maximum load phase in the existing distribution box is very close to the maximum current of the distribution box, even if the current of other load phases is small, the charging pile has no excess power for charging. The present invention adopts a control system, including a distribution box, which is connected to a charging pile and other loads. The control method includes calculating the available current of each phase of the charging pile, the energy management system communicates with the charging pile, calculating the input limit current of each phase respectively, calculating the actual required output power of the charging pile, comparing the available power of the charging pile with the actual required output power, calculating the average current of other loads of each phase of the distribution box and the average required input current of each phase, and charging and distributing each phase of the charging pile respectively. The present invention can make full use of the current of each phase of the distribution box for charging, thereby improving the charging efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle charging control, and in particular to a control method for independently adjusting three-phase current of direct current charging input of an electric vehicle. Background Art

[0002] When an existing charging pile charges an electric vehicle, the input phase current remains the same and the maximum current of the distribution box remains constant. When other loads connected to the same distribution box, that is, the load phase current other than the charging pile is unbalanced, the charging pile can only be charged according to the maximum current of the distribution box minus the maximum load phase current. If the maximum load phase current is very close to the maximum current of the distribution box, even if the other load phase currents are small, the charging pile has no excess power to charge the electric vehicle. Summary of the invention

[0003] In view of the above problems, the present invention provides a control method for independently adjusting the three-phase current of the DC charging input of an electric vehicle, which can fully utilize the current of each phase of the distribution box to charge the electric vehicle and improve the charging efficiency.

[0004] In order to achieve the purpose of the present invention, the following scheme is adopted:

[0005] A control method for independently adjustable three-phase current of DC charging input of electric vehicles adopts a control system, the control system includes a distribution box, the distribution box is connected to a charging pile and other loads, and an energy management system for real-time communication with the charging pile is provided in the distribution box. The control method includes the following steps:

[0006] S100: The energy management system collects other load currents I of each phase of the distribution box CT1 , I CT2 , I CT3 , and calculate the available current of each phase of the charging pile: I L1 =I MAX -I CT1 , I L2 =I MAX -I CT2 , I L3 =I MAX -I CT3 , I MAX The single-phase maximum output current of the distribution box;

[0007] S200: The energy management system communicates with the charging pile and sends I L1 ,I L2 ,I L3 Output to charging pile;

[0008] S300: The charging pile calculates the input limiting current of each phase separately: I X1 =Min(I L1 ,IRAT ), I X2 =Min(I L2 ,I RAT ), I X3 =Min(I L3 ,I RAT ), I RAT The single-phase rated input current of the charging pile;

[0009] S400: Calculate the actual output power P required by the charging pile OUT =Min(P RAT ,P REQ ), P RAT is the rated output power of the charging pile, P REQ Request power for electric vehicles;

[0010] S500: Calculate the available power P of the charging pile DC , determine whether it is greater than P OUT If not, the charging pile will limit the current I of each phase input X1 ,I X2 ,I X3 As the input control current I of each phase of the charging pile IN1 ,I IN2 ,I IN3 Charge the electric vehicle, then return to S100, if yes, continue;

[0011] S600: Calculate the average current I of other loads in each phase of the distribution box LAVG =(I CT1 +I CT2 +I CT3 ) / 3, calculate the average required input current I of each phase of the charging pile AVG =P OUT / 3 / U / η;

[0012] S700: Setting I CAL1 =I LAVG -I CT1 +I AVG， The input control current I of phase A of the charging pile IN1 =Min(I CAL1 ,I RAT );

[0013] S800: Determine whether I CAL1 >I RAT If yes, first calculate the average required input current I of phases B and C of the charging pile AVG =I AVG +(I CAL1 –I RAT ) / 2, then continue, if not, then continue directly;

[0014] S850: Settings I CAL2 =I LAVG -I CT2 +I AVG， The input control current I of phase B of the charging pile IN2 =Min(I CAL2 ,I RAT );

[0015] S900: Determine whether I CAL2 >I RAT If yes, first calculate the required input current I of phase C of the charging pile AVG =I AVG +(I CAL2 –I RAT ), then continue, if not, then continue directly;

[0016] S950: Settings I CAL3 =I LAVG -I CT3 +I AVG， The input control current I of phase C of the charging pile IN3 =Min(I CAL3 ,I RAT ), then returns to S100, and S100~S950 are executed in a continuous loop.

[0017] Furthermore, the current transformer used to collect other load currents in S100 adopts an open-close current transformer, and the distribution box in the control system includes:

[0018] The box body includes a shell fixed to a cement floor, the bottom end and one side of the shell are both open, the side opening of the shell is equipped with a box door, a bottom groove is provided on the cement floor below the opening at the bottom end of the shell, a plurality of threading rows are provided in the bottom groove, which are used to thread cables connected from the distribution box to the charging pile and other loads, a plurality of side mounting holes are provided on one side wall of the shell, each group of side mounting holes is used to temporarily store an open-and-close current transformer, a plurality of card boards are also provided on one side wall of the shell, and cables for connecting various components inside the distribution box are provided on the inner side of the card boards, and a plurality of side guide rails are provided on the other side wall of the shell for temporarily storing air switches;

[0019] The circuit function unit is arranged in the box body and close to the inner end wall of the outer shell. The circuit function unit includes an inner plate, on which a controller is embedded. The energy management system is arranged in the controller. Three distributors for distributing each phase of the three-phase electricity and a neutral line seat are connected below the controller. Multiple groups of internal installation holes are respectively provided below each distributor for assembling an open-close current transformer. A plurality of inner guide rails are also provided on the inner plate for assembling an air switch. The input end of the air switch on the inner guide rail is connected to the distributor or the neutral line seat through a cable, and the output end is connected to a charging pile or other loads through a cable.

[0020] A wiring unit is provided on the inner side of the box door and is used to connect the cables in the distribution box. It includes several cameras and at least two manipulators. The movable ends of the manipulators are provided with wiring components.

[0021] The switch transfer mechanism is arranged at the top of the box body and is used to transfer the air switch between the inner wall of the shell and the circuit function unit;

[0022] A transformer transfer mechanism is provided at the top of the box body and is used to transfer the split current transformer between the inner wall of the housing and the circuit functional unit;

[0023] After S950 is executed, before returning to S100, the control method is further provided with a time interval t, which is used to increase, decrease or replace a group of devices on the circuit function unit through the wiring unit, the switch transfer mechanism and the mutual inductor transfer mechanism. When other loads connected to one phase output by the distribution box are increased, decreased or replaced, when S100 is executed next time, the other load current collected by the phase is the sum of the updated currents of the other loads connected to the phase;

[0024] The step of adding a group of devices on the circuit functional unit comprises:

[0025] A100: Remove the air switch temporarily stored on the side rail through the switch transfer mechanism, then move and assemble it on the inner rail;

[0026] A200: Drag the cables in the wire row upward through the wiring unit, and then connect the cables to the wire holes at the lower end of the air switch described in A100;

[0027] A300: If the air switch installed in A100 is used to control the phase line input end of other loads, execute A310: remove several split current transformers temporarily stored on the outside of the side installation hole through the transformer transfer mechanism, and then move and assemble them to the outside of the inner installation hole, and then open the movable part of the split current transformer through the wiring unit, take out the cable on the inside of the card, and then connect one end of the cable to the wire hole at the upper end of the air switch, and the other end to the output end of the splitter, and make the cable pass through the fixed part of the split current transformer, and then close the split current transformer;

[0028] If the air switch installed in A100 is used to control the neutral line input terminal of other loads, execute A320: take out the cable located inside the card board through the wiring unit, and then connect one end of the cable to the wire hole at the upper end of the air switch, and the other end to the output end of the neutral line seat;

[0029] The step of reducing a group of devices on the circuit functional unit comprises:

[0030] B100: If the air switch in the group of devices is used to control the phase line input end of other loads, execute B110: open the movable part of the split current transformer through the wiring unit, then disconnect one end of the cable in the split current transformer from the wire hole at the upper end of the air switch, and disconnect the other end from the output end of the splitter, then move the cable and clamp it into the inner side of a group of card plates, then close the split current transformer, and then remove the split current transformer from the outer side of the inner hole through the transformer transfer mechanism, and then move and assemble it to the outer side of one side hole;

[0031] If the air switch in the group of devices is used to control the neutral line input end of other loads, execute B120: disconnect one end of the cable from the wire hole at the upper end of the air switch through the wiring unit, disconnect the other end from the output end of the neutral line seat, and then move the cable and clamp it into the inner side of a set of clamping plates;

[0032] B200: disconnect the cable from the wire hole at the lower end of the air switch described in B100 through the wiring unit;

[0033] B300: Remove the air switch described in B100 from the inner rail through the switch transfer mechanism, and then move and assemble it to the side rail;

[0034] The step of replacing a group of components on the circuit functional unit comprises:

[0035] Disassemble a group of devices on the circuit functional unit through B100~B300;

[0036] A new set of devices is installed on the circuit functional units through A100~A300.

[0037] The beneficial effects of this technical solution are:

[0038] 1. When the total capacity of the distribution box remains unchanged, the charging pile can make full use of the remaining capacity to charge electric vehicles, improve charging efficiency, shorten charging time, and fully meet the charging needs of electric vehicles.

[0039] 2. By communicating with the energy management system, the charging pile automatically adjusts the input current of each phase without affecting the power demand of other loads.

[0040] 3. When other loads are added to the distribution system, it is not necessary to expand the distribution capacity. The charging pile will automatically adjust the input current of each phase based on the load current data of each phase that interacts in real time with the energy management system.

[0041] 4. The distribution box temporarily stores cables, open and close current transformers, and air switches for expansion, which is convenient for subsequent load additions. It has strong flexibility and can automatically add and replace components inside the distribution box without manual operation, which can improve safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A simplified circuit diagram of a control system according to an embodiment of the present application is shown.

[0043] Figure 2 The main flow chart of the control method of the embodiment of the present application is shown.

[0044] Figure 3 An overall stereoscopic view of the distribution box in an embodiment of the present application is shown.

[0045] Figure 4 A partial three-dimensional diagram showing the internal structure of the distribution box in the embodiment of the present application is shown. Figure 1 .

[0046] Figure 5 A partial three-dimensional diagram showing the internal structure of the distribution box in the embodiment of the present application is shown. Figure 2 .

[0047] Figure 6 The present application embodiment is shown Figure 5 A magnified view of part A.

[0048] Figure 7 The present application embodiment is shown Figure 5 Enlarged view of part B.

[0049] Figure 8 A partial three-dimensional diagram showing the internal structure of the distribution box in the embodiment of the present application is shown. Figure 3 .

[0050] Fig. 9 The present application embodiment is shown Figure 8 Enlarged view of part C.

[0051] Fig.10 An internal front view of a distribution box in an embodiment of the present application is shown.

[0052] Fig.11 A stereoscopic view of the wiring assembly of the distribution box in an embodiment of the present application is shown.

[0053] Fig.12 A three-dimensional diagram of the switch transfer mechanism of the distribution box in an embodiment of the present application is shown.

[0054] Fig.13 A partial diagram of the switch transfer mechanism of the distribution box in an embodiment of the present application is shown.

[0055] Fig.14 A three-dimensional diagram of the transformer transfer mechanism of the distribution box in an embodiment of the present application is shown.

[0056] Fig.15 A partial diagram of the transformer transfer mechanism of the distribution box in the embodiment of the present application is shown.

[0057] Fig.16 The present application embodiment is shown Fig.15 Enlarged view of part D.

[0058] Markings in the figure: box body 1, shell 11, box door 12, handle 13, top plate 14, bottom groove 15, threading row 16, threading hole 161, side mounting hole 17, bottom rod 18, card plate 181, side guide rail 19, inner plate 21, controller 22, splitter 23, splitter screw 231, neutral line seat 24, neutral line screw 241, internal mounting hole 25, inner guide rail 26, wiring assembly 3, mounting plate 31, mounting hole 32, first linear mechanism 33, hanging plate 34, first rotary motor 35, first screwdriver head 36, second linear mechanism 37, air clamp 38, switch transfer mechanism 4, third linear mechanism 41, fourth linear mechanism 42, fifth linear mechanism 43, second rotary motor 44, T-frame 45, upper clamp block 451, sixth linear mechanism 4 6. first horizontal plate 47, lower clamping block 471, seventh linear mechanism 48, second horizontal plate 481, eighth linear mechanism 49, inverted L-shaped block 491, transformer transfer mechanism 5, ninth linear mechanism 51, vertical plate 511, tenth linear mechanism 52, third rotary motor 521, eleventh linear mechanism 522, fourth rotary motor 53, L-shaped frame 531, C-shaped plate 54, twelfth linear mechanism 55, thirteenth linear mechanism 56, motor seat 561, L-shaped plate 562, fifth rotary motor 57, first gear 58, second gear 59, second screwdriver head 591, rotating rod 592, cable 6, end hole 61, open and close current transformer 7, fixing screw 71, opening and closing screw 72, air switch 8, clamping screw 81, lock 82. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solutions and advantages of the present application clearer, the implementation methods of the present application are described in detail below, but the embodiments described in this application are only part of the embodiments of the present application, rather than all the embodiments.

[0060] The control method of the three-phase current of the DC charging input of electric vehicles can be independently adjusted. Figure 1The control system shown in the figure includes a distribution box, which is connected to a charging pile and other loads. Specifically, the other loads include lighting equipment, cooling fans, etc. that use the three-phase AC power output by the charging pile. An energy management system that communicates with the charging pile in real time is provided in the distribution box. The energy management system is connected to three sets of current transformers that are respectively used to monitor the current of each phase used by other loads. Specifically, the number of current transformers in each set of current transformers connected to the energy management system is equal to the number of other loads connected to each phase of the distribution box. Figure 1 In the figure, they are represented by CT1, CT2, and CT3 respectively. The charging pile receives three-phase AC power from the distribution box through cables. Figure 1 In the figure, L1, L2, and L3 are used to represent the three-phase AC power, and the DC power is output to the electric vehicle after being converted by the conversion device. In this embodiment, the conversion device is a rectifier. More specifically, a neutral line is connected between the distribution box and the charging pile, and a neutral line is also connected between the distribution box and other loads. The control system is grounded through a ground wire, and the neutral line and the ground wire are connected to the surrounding Figure 1 They are represented by N and PE respectively.

[0061] like Figure 2 The control method shown includes the following steps:

[0062] S100: The energy management system collects other load currents I of each phase of the distribution box CT1 , I CT2 , I CT3 , I CT1 It is equal to the sum of the A-phase currents of other loads measured by the first set of current transformers, I CT2 It is equal to the sum of the B-phase currents of other loads measured by the second set of current transformers, I CT3 is equal to the sum of the C-phase currents of the other loads measured by the third group of current transformers. Specifically, the current transformer in this embodiment adopts an open-close current transformer, and the available current of each phase of the charging pile is calculated: I L1 =I MAX -I CT1 , I L2 =I MAX -I CT2 , I L3 =I MAX -I CT3 , I MAX It is the single-phase maximum output current of the distribution box and can be configured manually;

[0063] S200: The energy management system communicates with the charging pile and sends I L1 ,I L2 ,I L3 Output to charging pile;

[0064] S300: The charging pile calculates the input limiting current of each phase separately: I X1 =Min(I L1 ,I RAT ), I X2 =Min(I L2 ,I RAT ), I X3 =Min(I L3 ,I RAT ), I RAT The single-phase rated input current of the charging pile;

[0065] S400: Calculate the actual output power P required by the charging pile OUT =Min(P RAT ,P REQ ), P RAT is the rated output power of the charging pile, P REQ In this embodiment, when the charging gun head of the charging pile is inserted into the charging port of the vehicle, a communication connection is established between the charging pile and the vehicle to obtain P REQ In other embodiments, the vehicle model can be identified by equipping a camera next to the charging pile for image recognition, or by installing a wireless radio frequency identification on the vehicle to further determine the P REQ ;

[0066] S500: Calculate the available power P of the charging pile DC , determine whether it is greater than P OUT If not, the charging pile will limit the current I of each phase input X1 ,I X2 ,I X3 As the input control current I of each phase of the charging pile IN1 ,I IN2 ,I IN3 Charge the electric vehicle, and then return to S100. If yes, continue. Specifically, P DC The calculation is done by the following formula: , where η is the conversion efficiency of the charging pile, which is provided by the charging pile manufacturer or obtained by testing before use, and U is the line voltage. In the control system of this embodiment, U=380V is input to the charging pile;

[0067] S600: Calculate the average current I of other loads in each phase of the distribution box LAVG =(I CT1 +I CT2 +I CT3 ) / 3, calculate the average required input current I of each phase of the charging pile AVG =P OUT / 3 / U / η;

[0068] S700: Setting I CAL1 =I LAVG -I CT1 +I AVG， The input control current I of phase A of the charging pile IN1 =Min(I CAL1 ,I RAT );

[0069] S800: Determine whether I CAL1 >I RAT If yes, first calculate the average required input current I of phases B and C of the charging pile AVG =I AVG +(I CAL1 –I RAT ) / 2, then continue, if not, then continue directly;

[0070] S850: Settings I CAL2 =I LAVG -I CT2 +I AVG， Make the input control current I of phase B of the charging pile IN2 =Min(I CAL2 ,I RAT );

[0071] S900: Determine whether I CAL2 >I RAT If yes, first calculate the required input current I of phase C of the charging pile AVG =I AVG +(I CAL2 –I RAT ), then continue, if not, then continue directly;

[0072] S950: Settings I CAL3 =I LAVG -I CT3 +I AVG， Make the input control current I of phase C of the charging pile IN3 =Min(I CAL3 ,I RAT ), then returns to S100, and S100~S950 are executed in a continuous loop.

[0073] Preferably, if Figure 3~Figure 16 As shown, the distribution box in the control system includes a box body 1, a circuit function unit, a wiring unit, a switch transfer mechanism 4, and a transformer transfer mechanism 5.

[0074] like Figure 3~Figure 10As shown, the box body 1 includes a shell 11 fixed to the cement floor, the bottom end and one side of the shell 11 are open, the side opening of the shell 11 is equipped with a box door 12, and the outer side of the box door 12 is provided with a handle 13. Specifically, the box door 12 is provided with a door lock, and the upper end of the shell 11 is provided with a top plate 14. The cement floor below the opening at the bottom end of the shell 11 is provided with a bottom groove 15, and a plurality of threading rows 16 are provided in the bottom groove 15. The threading row 16 is provided with a plurality of threading holes 161 for threading the cables 6 connected from the distribution box to the charging pile and other loads. A plurality of side mounting holes 17 are provided on one side wall inside the shell 11, and each group of side mounting holes 17 is used to temporarily store an open-and-closed current transformer 7. Specifically, the fixing screws 71 of the open-and-closed current transformer 7 are respectively assembled in the side mounting holes 17. A bottom rod 18 is also provided on one side wall inside the shell 11, and a plurality of groups of card plates 181 are provided on the bottom rod 18. Cables 6 for connecting various components inside the distribution box are provided on the inner side of the card plates 181. A plurality of side guide rails 19 are provided on the other side wall inside the shell 11 for placing air switches 8 that are not in use temporarily.

[0075] like Figure 4~Figure 10 As shown, the circuit function unit is arranged in the box body 1 and is close to the inner end wall of the outer shell 11. The circuit function unit includes an inner plate 21, on which a controller 22 is embedded. The energy management system is arranged in the controller 22. The input end of the controller 22 is connected to a busbar, and the busbar is connected to the controller 22 from the back of the inner plate 21 through a bottom groove 15. Three distributors 23 for distributing each phase of the three-phase electricity and a neutral line seat 24 are connected below the controller 22. A plurality of groups of internal installation holes 25 are respectively provided below each distributor 23 for assembling an open and close current transformer 7. A plurality of inner guide rails 26 are also provided on the inner plate 21 for assembling an air switch 8. The input end of the air switch 8 on the inner guide rail 26 is connected to the distributor 23 or the neutral line seat 24 through a cable 6, and the output end is connected to a charging pile or other loads through a cable 6.

[0076] The wiring unit is arranged on the inner side of the box door 12, and is used to connect the cables 6 in the distribution box, including several cameras and at least two manipulators, and the movable ends of the manipulators are provided with Fig.11The wiring assembly 3 shown in the figure comprises a mounting plate 31 for mounting on the manipulator, a mounting hole 32 matching the hole position of the manipulator is opened on the mounting plate 31, a first linear mechanism 33 and a second linear mechanism 37 are arranged at one end of the mounting plate 31, a hanging plate 34 is arranged at the output end of the first linear mechanism 33, a first rotary motor 35 is arranged at the lower end of the hanging plate 34, a first screwdriver head 36 is arranged at the output end of the first rotary motor 35, and an air clamp 38 is arranged at the output end of the second linear mechanism 37. When the cable 6 in the threading row 16 is connected to the air switch 8, the cable 6 is pulled out through the air clamp 38 of the wiring assembly 3 and inserted into the air switch The wire hole at the lower end of the air switch 8 is then tightened with the clamping screw 81 of the air switch 8 through the first screwdriver head 36 to tighten the end hole 61 of the cable 6, so that the cable 6 and the air switch 8 are conductive. When the cable 6 in the card plate 181 is connected to the air switch 8 from the splitter 23 or the neutral wire seat 24, the cable 6 is taken out together through the two wiring assemblies 3, and then the above operation is performed, and the end hole 61 is pressed under the splitter screw 231 or the neutral wire screw 241. In addition, the connecting wires between the controller 22 and the splitter 23, and the connecting wires between the controller 22 and the neutral wire seat 24 are all pre-assembled, and there is no need to use a wiring unit for wiring.

[0077] like Figure 4 , Figure 8 , Fig.12 , Fig.13 As shown, the switch transfer mechanism 4 is arranged at the top of the box body 1, and is used to transfer the air switch 8 between the inner wall of the shell 11 and the circuit function unit, including a third linear mechanism 41 fixed to the inner top wall of the box body 1, and a fourth linear mechanism 42 arranged perpendicular to the sliding direction is arranged at the lower end of the sliding end of the third linear mechanism 41, and a fifth linear mechanism 43 is vertically arranged at the sliding end of the fourth linear mechanism 42, and a second rotary motor 44 is vertically arranged on one side of the lower end of the output shaft of the fifth linear mechanism 43, and a T-shaped frame 45 is arranged at the lower end of the output shaft of the second rotary motor 44, and an upper clamping block 451 is arranged on one side of the vertical part of the T-shaped frame 45, and the upper clamping block 451 is attached to the lower end surface of the horizontal part of the T-shaped frame 45, and a sixth linear mechanism 46 is vertically arranged on the other side of the vertical part of the T-shaped frame 45, and the sixth linear mechanism 46 is vertically arranged on the other side of the vertical part of the T-shaped frame 45. A first transverse plate 47 is provided at the lower end of the output shaft of the mechanism 46, and a lower clamping block 471 matching the upper clamping block 451 is provided on the upper end surface of the first transverse plate 47. The upper clamping block 451 and the lower clamping block 471 are both made of rubber and are used to clamp the air switch 8 from the upper and lower ends. A seventh linear mechanism 48 is also vertically provided on one side of the sixth linear mechanism 46, and a second transverse plate 481 is provided at the lower end of the output shaft of the seventh linear mechanism 48, and an eighth linear mechanism 49 is provided at the lower end of the second transverse plate 481. An inverted L-shaped block 491 is provided at the output end of the eighth linear mechanism 49, and the transverse portion of the inverted L-shaped block 491 matches the lock 82 at the lower end of the air switch 8, and is used to pull down the lock 82 to disengage the air switch 8 from the side guide rail 19, or to assemble the air switch 8 to the inner guide rail 26.

[0078] like Figure 4 , Figure 8 , Figure 14~Figure 16 As shown, the transformer transfer mechanism 5 is arranged at the top of the box body 1, and is used to transfer the split current transformer 7 between the inner side wall of the shell 11 and the circuit functional unit, including a ninth linear mechanism 51 fixed to the inner top wall of the box body 1, a vertical plate 511 is arranged at the lower end of the sliding end, a tenth linear mechanism 52 is vertically arranged on one side of the vertical plate 511, a third rotary motor 521 is arranged at the sliding end of the tenth linear mechanism 52, an eleventh linear mechanism 522 is arranged at the output end of the third rotary motor 521, the eleventh linear mechanism 522 is arranged vertically to the tenth linear mechanism 52, and the eleventh linear mechanism 522 is also arranged vertically to the ninth linear mechanism 51. The sliding end of the eleventh straight line mechanism 522 is vertically provided with a fourth rotary motor 53, an L-shaped frame 531 is provided at the upper end of the output shaft of the fourth rotary motor 53, a C-shaped plate 54 is provided at the upper end of the vertical portion of the L-shaped frame 531, and the two horizontal portions of the C-shaped plate 54 are used to carry the open-and-close current transformer 7, and a pair of twelfth straight line mechanisms 55 are provided on the outer side surface of the vertical portion of the C-shaped plate 54 in opposite output directions, and a thirteenth straight line mechanism 56 is provided at the output end of the twelfth straight line mechanism 55, and a motor seat 561 is provided at the output end of the thirteenth straight line mechanism 56, and a fifth rotary motor 57 is provided on the motor seat 561. Specifically, a motor seat 561 is provided on A fifth rotating motor 57 is arranged at the end, and a fifth rotating motor 57 is arranged at the lower end of another motor seat 561. An L-shaped plate 562 is arranged at one end of the motor seat 561. A double rotating seat including two round openings is arranged at one end of the vertical portion of the L-shaped plate 562. The output shaft of the fifth rotating motor 57 is rotatably matched in one round opening of the double rotating seat. A first gear 58 is arranged at the output end of the fifth rotating motor 57. The first gear 58 is meshed with a second gear 59. A second screwdriver head 591 for rotating a fixing screw 71 or an opening and closing screw 72 of the open and close current transformer 7 is arranged at one end face of the second gear 59. A rotating Cooperating with the other circular rotating rod 592 of the double rotating seat, in addition, the transformer transfer mechanism 5 can also cooperate with the wiring unit to open and close the open and close current transformer 7, that is, by rotating the opening and closing screw 72 through the second screwdriver head 591, the open and close current transformer 7 is opened, and the cable 6 is passed through, and then the open and close current transformer 7 is closed to monitor the phase current. Several cables 6 are respectively connected to each splitter 23. The sum of the currents measured by the open and close current transformer 7 passed by each cable 6 for transmitting the same-phase current is the phase current used by other loads of the phase, that is, CT1 or CT2 or CT3.

[0079] Based on the distribution box in the control system of the above preferred embodiment, after S950 is executed and before returning to S100, the control method is also provided with a time interval t, which is used to increase, reduce or replace a group of devices on the circuit function unit through the wiring unit, the switch transfer mechanism 4 and the transformer transfer mechanism 5.

[0080] Specifically, the step of adding a group of devices on the circuit functional unit includes:

[0081] A100: The air switch 8 temporarily stored on the side rail 19 is removed by the switch transfer mechanism 4, and then moved and assembled on the inner rail 26;

[0082] A200: Drag the cable 6 in the wire row 16 upward through the wiring unit, and then connect the cable 6 to the wire hole at the lower end of the air switch 8 described in A100;

[0083] A300: If the air switch 8 assembled in A100 is used to control the phase line input end of other loads, execute A310: remove the several open-and-close current transformers 7 temporarily stored on the outside of the side mounting hole 17 through the transformer transfer mechanism 5, and then move and assemble them to the outside of the inner mounting hole 25, and then open the movable part of the open-and-close current transformer 7 through the wiring unit, take out the cable 6 arranged on the inner side of the card plate 181, and then connect one end of the cable 6 to the wire hole at the upper end of the air switch 8, and the other end to the output end of the splitter 23, and make the cable 6 pass through the fixed part of the open-and-close current transformer 7, and then close the open-and-close current transformer 7;

[0084] If the air switch 8 assembled with A100 is used to control the neutral line input end of other loads, execute A320: take out the cable 6 arranged on the inner side of the card plate 181 through the wiring unit, and then connect one end of the cable 6 to the wire hole at the upper end of the air switch 8, and connect the other end to the output end of the neutral line seat 24.

[0085] Specifically, the step of reducing a group of devices on a circuit functional unit includes:

[0086] B100: If the air switch 8 in the group of devices is used to control the phase line input end of other loads, execute B110: open the movable part of the open-close current transformer 7 through the wiring unit, then disconnect one end of the cable 6 in the open-close current transformer 7 from the wire hole at the upper end of the air switch 8, and disconnect the other end from the output end of the splitter 23, then move the cable 6 and clamp it into the inner side of a group of clamping plates 181, then close the open-close current transformer 7, and then remove the open-close current transformer 7 from the outer side of the inner hole 25 through the transformer transfer mechanism 5, and then move and assemble it to the outer side of the one-side mounting hole 17;

[0087] If the air switch 8 in the group of devices is used to control the neutral line input end of other loads, execute B120: disconnect one end of the cable 6 from the wire hole at the upper end of the air switch 8 through the wiring unit, disconnect the other end from the output end of the neutral line seat 24, and then move the cable 6 and clamp it into the inner side of a group of clamping plates 181;

[0088] B200: disconnect the cable 6 from the wire hole at the lower end of the air switch 8 described in B100 through the wiring unit;

[0089] B300: Remove the air switch 8 described in B100 from the inner guide rail 26 through the switch transfer mechanism 4, and then move and assemble it to the side guide rail 19.

[0090] Specifically, the steps of replacing a group of devices on the circuit functional unit include:

[0091] Disassemble a group of devices on the circuit functional unit through B100~B300;

[0092] A new set of devices is installed on the circuit functional units through A100~A300.

[0093] In summary, more specifically, the wiring unit, the switch transfer mechanism 4 and the transformer transfer mechanism 5 operate in more detailed steps in the above A100-A300 and B100-B300:

[0094] 1. For the wiring unit:

[0095] A200 includes:

[0096] A201: Move the wiring assembly 3 by the manipulator;

[0097] A202: Clamp the cable 6 by the air clamp 38, then pull out the cable 6 by the manipulator and insert it into the wire hole at the lower end of the air switch 8;

[0098] A203: The clamping screw 81 of the air switch 8 is screwed by the first linear mechanism 33 and the first screwdriver head 36, and the end hole 61 of the cable 6 is clamped, so that the cable 6 and the air switch 8 are connected.

[0099] In A300, the wiring assembly 3 is first moved by two manipulators respectively, and then the air clamp 38 of one wiring assembly 3 clamps the upper part of the cable 6, and the air clamp 38 of the other wiring assembly 3 clamps the lower part of the cable 6, and the wiring assembly 3 at the bottom connects one end of the cable 6 to the wire hole at the upper end of the air switch 8;

[0100] If A310 is executed, the wiring assembly 3 located at the top connects one end of the cable 6 to the output end of the splitter 23. If A320 is executed, the wiring assembly 3 located at the top connects one end of the cable 6 to the output end of the neutral line seat 24.

[0101] Then, according to method A203, connect cable 6 with air switch 8 / distributor 23 / neutral socket 24.

[0102] In A310 and B110, the wiring unit can also close or open the movable part of the open-and-close current transformer 7 by screwing the opening and closing screw 72 with the first screwdriver head 36 and then clamping the movable part of the open-and-close current transformer 7 with the air clamp 38.

[0103] 2. For the switch transfer mechanism 4:

[0104] As a supplement to the description of the above embodiment, the switch transfer mechanism 4 includes a first moving assembly with three-axis movement and one-axis rotation functions, the first moving assembly includes a third linear mechanism 41, a fourth linear mechanism 42, a fifth linear mechanism 43, and a second rotary motor 44, and a T-shaped frame 45 is provided at the lower end of the first moving assembly. On this basis:

[0105] A100 includes:

[0106] A101: Move the upper clamping block 451 and the lower clamping block 471 to the outside of the air switch 8 of the side guide rail 19 through the first moving assembly;

[0107] A102: The opening of the first horizontal plate 47 is controlled by the sixth linear mechanism 46, and then the upper clamping block 451 and the lower clamping block 471 are respectively moved to the upper and lower ends of the air switch 8 by the first moving assembly, and then the upper clamping block 451 and the lower clamping block 471 are clamped by the sixth linear mechanism 46, and at the same time, the horizontal part of the inverted L-shaped block 491 is pushed to insert the latch 82 by the eighth linear mechanism 49, and then the latch 82 is pulled downward by the seventh linear mechanism 48 to make it disengage from the side guide rail 19;

[0108] A103: Move and rotate the air switch 8 through the first moving assembly to the outside of the inner guide rail 26, then release the clamping and unlock the lock 82 to allow the air switch 8 to be assembled onto the inner guide rail 26.

[0109] B300 includes:

[0110] B301: Move the upper clamping block 451 and the lower clamping block 471 to the outside of the air switch 8 of the inner guide rail 26 through the first moving assembly;

[0111] B302: Disconnect the air switch 8 from the inner guide rail 26 in the same manner as A102;

[0112] B303: Move and rotate the air switch 8 through the first moving assembly to the outside of the side guide rail 19, then release the clamping and unlock the latch 82 to assemble the air switch 8 onto the side guide rail 19.

[0113] 3. For the mutual inductor transfer mechanism 5:

[0114] As a supplement to the description of the above embodiment, the mutual inductor transfer mechanism 5 includes a second mobile assembly with three-axis movement and two-axis rotation functions, the second mobile assembly includes a ninth linear mechanism 51, a vertical plate 511, a tenth linear mechanism 52, a third rotary motor 521, an eleventh linear mechanism 522, a fourth rotary motor 53, an L-shaped frame 531, and a C-shaped plate 54 is connected to the second mobile assembly. On this basis:

[0115] In A310 and B110, the steps of removing or assembling the split-type current transformer 7 include:

[0116] The C-shaped plate 54 is moved by the second moving assembly so that the split current transformer 7 is located between the two horizontal parts of the C-shaped plate 54. Specifically, the inner side surface of the vertical part of the C-shaped plate 54 abuts against the outer end of the movable part of the split current transformer 7.

[0117] The positions of the two second screwdriver heads 591 are adjusted by the two twelfth linear mechanisms 55, and then the second screwdriver heads 591 are pushed into the grooves of the fixing screws 71 by the thirteenth linear mechanism 56, and then the first gear 58 is rotated by the fifth rotary motor 57, driving the second gear 59 to rotate;

[0118] If the open-type current transformer 7 is to be removed, the second screwdriver head 591 is used to loosen the fixing screw 71, and at the same time, the second screwdriver head 591 is used to drive the fixing screw 71 to move toward the side mounting hole 17 or the inner mounting hole 25 through the thirteenth linear mechanism 56. If the open-type current transformer 7 is to be assembled, the second screwdriver head 591 is used to tighten the fixing screw 71, and at the same time, the second screwdriver head 591 is used to drive the fixing screw 71 to move toward the side mounting hole 17 or the inner mounting hole 25 through the thirteenth linear mechanism 56.

[0119] According to the above operation, when other loads connected to one phase of the distribution box output are increased, decreased or replaced, the next time S100 is executed, the other load current collected by the phase is the sum of the updated currents of other loads connected to the phase.

[0120] Specifically, the controller 22 is also provided with a remote communication module and a lighting lamp, and the control personnel can observe the situation in the distribution box through the camera, and remotely control the wiring unit, the switch transfer mechanism 4, and the transformer transfer mechanism 5 to perform corresponding operations.

[0121] In this embodiment, the first linear mechanism 33, the second linear mechanism 37, the fifth linear mechanism 43, the sixth linear mechanism 46, the seventh linear mechanism 48, the eighth linear mechanism 49, the twelfth linear mechanism 55, and the thirteenth linear mechanism 56 all use single-axis linear cylinders, and the third linear mechanism 41, the fourth linear mechanism 42, the ninth linear mechanism 51, the tenth linear mechanism 52, and the eleventh linear mechanism 522 all use rodless linear cylinders.

[0122] The above are only some of the embodiments listed in this application and are not intended to limit this application.

Claims

1. A control method for independently adjustable three-phase current of DC charging input of electric vehicles, characterized in that: A control system is used, the control system includes a distribution box, the distribution box is connected to a charging pile and other loads, an energy management system for real-time communication with the charging pile is arranged in the distribution box, and the energy management system is connected to three sets of current transformers for monitoring each phase current used by other loads. The control method includes the following steps: S100: The energy management system collects other load currents I of each phase of the distribution box CT1 , I CT2 , I CT3 , I CT1 It is equal to the sum of the A-phase currents of other loads measured by the first set of current transformers, I CT2 It is equal to the sum of the B-phase currents of other loads measured by the second set of current transformers, I CT3 It is equal to the sum of the C-phase currents of other loads measured by the third set of current transformers, and the available current of each phase of the charging pile is calculated: I L1 =I MAX -I CT1 , I L2 =I MAX -I CT2 , I L3 =I MAX -I CT3 , I MAX The single-phase maximum output current of the distribution box; S200: The energy management system communicates with the charging pile and sends I L1 ,I L2 ,I L3 Output to charging pile; S300: The charging pile calculates the input limiting current of each phase separately: I X1 =Min(I L1 ,I RAT ), I X2 =Min(I L2 ,I RAT ), I X3 =Min(I L3 ,I RAT ), I RAT The single-phase rated input current of the charging pile; S400: Calculate the actual output power P required by the charging pile OUT =Min(P RAT ,P REQ ), P RAT is the rated output power of the charging pile, P REQ Request power for electric vehicles; S500: Calculate the available power P of the charging pile DC , determine whether it is greater than P OUT If not, the charging pile will limit the current I of each phase input X1 ,I X2 ,I X3 As the input control current I of each phase of the charging pile IN1 ,I IN2 ,I IN3 Charge the electric vehicle, then return to S100, if yes, continue; S600: Calculate the average current I of other loads in each phase of the distribution box LAVG =(I CT1 +I CT2 +I CT3 ) / 3, calculate the average required input current I of each phase of the charging pile AVG =P OUT / 3 / U / η, where η is the conversion efficiency of the charging pile and U is the line voltage; S700: Setting I CAL1 =I LAVG -I CT1 +I AVG， The input control current I of phase A of the charging pile IN1 =Min(I CAL1 ,I RAT ); S800: Determine whether I CAL1 >I RAT If yes, first calculate the average required input current I of phases B and C of the charging pile AVG =I AVG +(I CAL1 –I RAT ) / 2, then continue, if not, then continue directly; S850: Settings I CAL2 =I LAVG -I CT2 +I AVG， The input control current I of phase B of the charging pile IN2 =Min(I CAL2 ,I RAT ); S900: Determine whether I CAL2 >I RAT If yes, first calculate the required input current I of phase C of the charging pile AVG =I AVG +(I CAL2 –I RAT ), then continue, if not, then continue directly; S950: Settings I CAL3 =I LAVG -I CT3 +I AVG， The input control current I of phase C of the charging pile IN3 =Min(I CAL3 ,I RAT ), then returns to S100, and S100~S950 are executed in a continuous loop.

2. The control method for independently adjustable three-phase current of DC charging input of electric vehicle according to claim 1 is characterized in that: The charging pile inputs three-phase AC power from the distribution box through cables L1, L2, and L3, and after conversion through a conversion device, outputs DC power to the electric vehicle.

3. The control method for independently adjustable three-phase current of DC charging input of electric vehicle according to claim 1 is characterized in that: A neutral line N is connected between the distribution box and the charging pile, and a neutral line N is also connected between the distribution box and other loads.

4. The control method for independently adjustable three-phase current of DC charging input of electric vehicle according to claim 1 is characterized in that: The control system is grounded through the ground wire PE.

5. The control method for independently adjustable three-phase current of DC charging input of electric vehicle according to claim 1, characterized in that: P DC The calculation is done by the following formula: , where η is the conversion efficiency of the charging pile and U is the line voltage.

6. The control method for independently adjustable three-phase current of DC charging input of electric vehicle according to claim 1, characterized in that: The number of current transformers in each group of current transformers connected to the energy management system is equal to the number of other loads connected to each phase of the distribution box.

7. The control method for independently adjustable three-phase current of DC charging input of electric vehicle according to claim 6, characterized in that: The current transformer used to collect other load currents in S100 is a split current transformer (7); The distribution box in the control system includes: The box body (1) comprises a shell (11) fixed to a cement floor, the bottom end and one side of the shell (11) are both open, the side opening of the shell (11) is equipped with a box door (12), the cement floor below the opening at the bottom end of the shell (11) is provided with a bottom groove (15), a plurality of wire-threading rows (16) are provided in the bottom groove (15), and are used to thread cables (6) connected from the distribution box to the charging pile and other loads, a plurality of groups of side mounting holes (17) are provided on one side wall inside the shell (11), each group of side mounting holes (17) is used to temporarily store an open-close current transformer (7), a plurality of groups of card plates (181) are also provided on one side wall inside the shell (11), and cables (6) for connecting various components inside the distribution box are provided on the inner side of the card plates (181), and a plurality of side guide rails (19) are provided on the other side wall inside the shell (11), and are used to temporarily store air switches (8); A circuit function unit is arranged in a box body (1) and close to the inner end wall of the outer shell (11), the circuit function unit comprises an inner plate (21), a controller (22) is embedded in the inner plate (21), an energy management system is arranged in the controller (22), three distributors (23) for distributing the three-phase electricity and a neutral line seat (24) are connected below the controller (22), a plurality of groups of internal installation holes (25) are respectively provided below each distributor (23) for assembling an open-close current transformer (7), a plurality of inner guide rails (26) are also provided on the inner plate (21) for assembling an air switch (8), an input end of the air switch (8) on the inner guide rail (26) is connected to the distributor (23) or the neutral line seat (24) via a cable (6), and an output end is connected to a charging pile or other load via a cable (6); A wiring unit, arranged on the inner side of the box door (12), used for wiring the cables (6) in the distribution box, comprising a plurality of cameras and at least two manipulators, wherein the movable ends of the manipulators are provided with wiring assemblies (3); A switch transfer mechanism (4) is disposed at the top of the box body (1) and is used to transfer the air switch (8) between the inner wall of the housing (11) and the circuit function unit; A current transformer transfer mechanism (5) is arranged at the top of the box (1) and is used to transfer the split-type current transformer (7) between the inner wall of the housing (11) and the circuit functional unit; After S950 is executed, before returning to S100, the control method is further provided with a time interval t, which is used to increase, decrease or replace a group of devices on the circuit function unit through the wiring unit, the switch transfer mechanism (4) and the mutual inductor transfer mechanism (5), when other loads connected to one phase output by the distribution box are increased, decreased or replaced, when S100 is executed next time, the other load current collected by the phase is the sum of the updated currents of the other loads connected to the phase; The step of adding a group of devices on the circuit functional unit comprises: A100: The air switch (8) temporarily stored on the side guide rail (19) is removed by the switch transfer mechanism (4), and then moved and assembled on the inner guide rail (26); A200: Drag the cable (6) in the wire row (16) upwards through the wiring unit, and then connect the cable (6) to the wire hole at the lower end of the air switch (8) described in A100; A300: If the air switch (8) assembled in A100 is used to control the phase line input end of other loads, execute A310: remove the plurality of open-and-close current transformers (7) temporarily stored on the outside of the side mounting hole (17) through the transformer transfer mechanism (5), then move and assemble them to the outside of the internal mounting hole (25), then open the movable part of the open-and-close current transformer (7) through the wiring unit, take out the cable (6) arranged on the inside of the card plate (181), then connect one end of the cable (6) to the wire hole at the upper end of the air switch (8), and connect the other end to the output end of the distributor (23), and make the cable (6) pass through the fixed part of the open-and-close current transformer (7), and then close the open-and-close current transformer (7); If the air switch (8) assembled with A100 is used to control the neutral line input terminal of other loads, execute A320: take out the cable (6) arranged on the inner side of the card plate (181) through the wiring unit, and then connect one end of the cable (6) to the wire hole at the upper end of the air switch (8), and connect the other end to the output end of the neutral line seat (24); The step of reducing a group of devices on the circuit functional unit comprises: B100: If the air switch (8) in the group of devices is used to control the phase line input end of other loads, execute B110: open the movable part of the open-close current transformer (7) through the wiring unit, then disconnect one end of the cable (6) in the open-close current transformer (7) from the wire hole at the upper end of the air switch (8), and disconnect the other end from the output end of the distributor (23), then move the cable (6) and clamp it into the inner side of a group of clamping plates (181), then close the open-close current transformer (7), and then remove the open-close current transformer (7) from the outer side of the inner hole (25) through the transformer transfer mechanism (5), and then move and assemble it to the outer side of the side hole (17); If the air switch (8) in the group of devices is used to control the neutral line input end of other loads, execute B120: disconnect one end of the cable (6) from the wire hole at the upper end of the air switch (8) through the wiring unit, disconnect the other end from the output end of the neutral line seat (24), and then move the cable (6) and clamp it into the inner side of a group of clamping plates (181); B200: disconnecting the cable (6) from the wire hole at the lower end of the air switch (8) described in B100 through the wiring unit; B300: Remove the air switch (8) described in B100 from the inner guide rail (26) through the switch transfer mechanism (4), and then move and assemble it onto the side guide rail (19); The step of replacing a group of components on the circuit functional unit comprises: Disassemble a group of devices on the circuit functional unit through B100~B300; A new set of devices is installed on the circuit functional units through A100~A300.

8. The control method for independently adjustable three-phase current of DC charging input of electric vehicle according to claim 7, characterized in that: The switch transfer mechanism (4) comprises a first moving assembly, a T-shaped frame (45) is provided at the lower end of the first moving assembly, an upper clamping block (451) is provided on one side of the vertical portion of the T-shaped frame (45), the upper clamping block (451) is attached to the lower end surface of the horizontal portion of the T-shaped frame (45), a sixth linear mechanism (46) is vertically provided on the other side of the vertical portion of the T-shaped frame (45), a first horizontal plate (47) is provided at the lower end of the output shaft of the sixth linear mechanism (46), and a lower clamping block (471) matching the upper clamping block (451) is provided on the upper end surface of the first horizontal plate (47). The upper clamping block (451) and the lower clamping block (471) are used to clamp the air switch (8) from the upper and lower ends. A seventh linear mechanism (48) is also vertically provided on one side of the sixth linear mechanism (46). A second horizontal plate (481) is provided at the lower end of the output shaft of the seventh linear mechanism (48). An eighth linear mechanism (49) is provided at the lower end of the second horizontal plate (481). An inverted L-shaped block (491) is provided at the output end of the eighth linear mechanism (49). The horizontal portion of the inverted L-shaped block (491) matches the latch (82) at the lower end of the air switch (8). A100 includes: A101: The upper clamping block (451) and the lower clamping block (471) are moved to the outside of the air switch (8) of the side guide rail (19) by means of a first moving assembly; A102: The opening of the first horizontal plate (47) is controlled by the sixth linear mechanism (46), and then the upper clamping block (451) and the lower clamping block (471) are respectively moved to the upper and lower ends of the air switch (8) by the first moving assembly, and then the upper clamping block (451) and the lower clamping block (471) are clamped by the sixth linear mechanism (46), and at the same time, the horizontal portion of the inverted L-shaped block (491) is pushed to insert the latch (82) by the eighth linear mechanism (49), and then the latch (82) is pulled downward by the seventh linear mechanism (48) to be separated from the side guide rail (19); A103: The air switch (8) is moved and rotated by the first moving assembly to the outside of the inner guide rail (26), and then the clamp is released and the latch (82) is unlocked, so that the air switch (8) is assembled onto the inner guide rail (26); B300 includes: B301: The upper clamping block (451) and the lower clamping block (471) are moved to the outside of the air switch (8) of the inner guide rail (26) by means of a first moving assembly; B302: Disconnect the air switch (8) from the inner guide rail (26) in the same manner as A102; B303: The air switch (8) is moved and rotated by the first moving assembly to the outside of the side guide rail (19), and then the clamp is released and the latch (82) is unlocked, so that the air switch (8) is assembled on the side guide rail (19).

9. The control method for independently adjustable three-phase current of DC charging input of electric vehicle according to claim 7, characterized in that: The transformer transfer mechanism (5) comprises a second moving assembly, the second moving assembly is connected to a C-shaped plate (54), a pair of twelfth linear mechanisms (55) arranged in opposite output directions are provided on the outer side surface of the vertical portion of the C-shaped plate (54), a thirteenth linear mechanism (56) is provided at the output end of the twelfth linear mechanism (55), a fifth rotating motor (57) is provided at the output end of the thirteenth linear mechanism (56), a first gear (58) is provided at the output end of the fifth rotating motor (57), the first gear (58) is meshed with a second gear (59), and a second screwdriver head (591) for rotating a fixing screw (71) or an opening and closing screw (72) of the open and close type current transformer (7) is provided on one end surface of the second gear (59); In A310 and B110, the steps of removing or assembling the split-type current transformer (7) include: The C-shaped plate (54) is moved by the second moving assembly so that the split-type current transformer (7) is located between two horizontal parts of the C-shaped plate (54), specifically, the inner side surface of the vertical part of the C-shaped plate (54) abuts against the outer end of the movable part of the split-type current transformer (7); The positions of the two second screwdriver heads (591) are adjusted by two twelfth linear mechanisms (55), and then the second screwdriver heads (591) are pushed into the grooves of the fixing screws (71) by a thirteenth linear mechanism (56), and then the first gear (58) is rotated by a fifth rotary motor (57), thereby driving the second gear (59) to rotate; If the split-type current transformer (7) is to be removed, the second screwdriver head (591) is used to loosen the fixing screw (71), and at the same time, the second screwdriver head (591) is used to drive the fixing screw (71) to move outside the side mounting hole (17) or the inner mounting hole (25) through the thirteenth linear mechanism (56). If the split-type current transformer (7) is to be assembled, the second screwdriver head (591) is used to tighten the fixing screw (71), and at the same time, the second screwdriver head (591) is used to drive the fixing screw (71) to move inside the side mounting hole (17) or the inner mounting hole (25) through the thirteenth linear mechanism (56).

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