Mutual inductor, mutual inductor combination main circuit connector assembly and mutual inductor combination main circuit connector unit

Abstract

The utility model relates to the technical field of low-voltage complete equipment, in particular to a mutual inductor, a mutual inductor combination main circuit connector assembly and a mutual inductor combination main circuit connector unit. The mutual inductor comprises a mutual inductor insulation shell wrapping a mutual inductor iron core coil, the mutual inductor insulation shell is provided with a copper bar through hole, the back face of the mutual inductor insulation shell is provided with an insertion sleeve extending outwards, and the insertion sleeve is used for being inserted into the outer portion of the copper bar insertion sleeve extending outwards of the matched main circuit connector. The utility model has the beneficial effects that the standardization of the fixing process of the mutual inductor is realized, the unit depth is not changed, the connection structure of a non-lap-joint main circuit is not changed, and the use amount of connecting copper bars is not increased. Copper bar fasteners penetrate through the fixing holes and the copper bar fixing holes to fix the mutual inductor and the main circuit connector together, and equivalently, manual installation of the mutual inductor is zero.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage complete equipment, in particular to a mutual inductor, a mutual inductor combined main circuit connector assembly and a unit. Background Art

[0002] In the traditional main circuit connection structure of low-voltage switchgear units, traditional main circuit connectors must be flipped to connect to the circuit breaker's phase centers. In addition, transformers must be arranged. The phase-to-phase center distances for horizontally mounted 630A circuit breakers are generally 58mm, 44mm, 45mm, and 46mm, which is smaller than the transformer width. The B-phase transformer is located on the back of the circuit breaker and fixed to the rear of the connecting copper busbar, while the A and C-phase transformers are fixed to the front of the connecting copper busbar. The transformers are fixed to the connecting copper busbar with a shoulder bar. However, fixing the B-phase transformer with a shoulder bar on the back of the circuit breaker is difficult. Furthermore, horizontally mounting the A and C-phase transformers requires additional unit depth, requiring longer connecting copper bars. The installation of transformers in 630A and 400A units requires 180.5mm of unit depth. Furthermore, the phase-to-phase center distance of a 100A circuit breaker is 30mm, requiring only wires to connect to the main circuit connectors. To connect the circuit breaker and the main circuit connector with a connecting copper busbar, the circuit breaker needs to be a 100A circuit breaker with a 250A frame, and the unit height can only be 200mm.

[0003] The units of low-voltage switchgear use a traditional main circuit connection structure. Connecting the circuit breaker and the main circuit connector with a connecting copper busbar is cheaper than connecting with wires. However, in order to install the transformer, the connecting copper busbar needs to be lengthened. In addition, the connecting copper busbar has many bending steps, the connection assembly process is complicated, and the degree of standardization is very low.

[0004] In order to solve the problems existing in the traditional main circuit connection structure of the low-voltage switchgear unit, the applicant proposed a non-lap main circuit connection structure, which is specifically disclosed in the patent document with patent number 202321148992.3. In this non-lap main circuit connection structure technology, the transformer of phase B is fixed at the bottom with a bracket, and the transformers of phases A and C are still fixed to the front end of the copper busbar with a shoulder pole, such as Figure 1 and 2 shown.

[0005] This non-overlap main circuit connection structure realizes the miniaturization of the unit cabinet width. The cabinet width of the 630A unit can be 500mm, the unit depth is 350mm, and the minimum can reach 300mm.

[0006] However, the transformer still requires additional brackets and shoulder poles, which are time-consuming to install. Moreover, the transformer fixed with the shoulder pole is prone to loosening due to transportation vibration. At the same time, the unit height can only be 200mm, and only auxiliary circuit connectors with 16 connection points can be arranged, and communication plug-ins cannot be arranged. The unit has a low degree of intelligence and standardization. Utility Model Content

[0007] The technical problem to be solved by the utility model is that the installation standardization degree of the traditional mutual inductor is low, additional fixing components are required, and the installation is time-consuming.

[0008] The utility model solves the technical problem by adopting the following technical solution: a mutual inductor, comprising a mutual inductor insulating shell enclosing a mutual inductor iron core coil, the mutual inductor insulating shell having a copper busbar through-hole, and the back side of the mutual inductor insulating shell having an outwardly extending insertion sleeve for inserting and mating with the outwardly extending copper busbar insertion sleeve of a matching main circuit connector.

[0009] In some embodiments, optionally, a wiring terminal is further included, and the wiring terminal is arranged on the front side of the transformer insulation housing.

[0010] In some embodiments, optionally, the connection terminal is located on a wide side of the copper busbar via.

[0011] In some embodiments, optionally, the periphery of the terminal block has an isolation enclosure for insulation isolation.

[0012] In some embodiments, optionally, the isolation enclosure is in the shape of a mountain, including a C-shaped outer ring isolation enclosure for insulating and isolating the wiring terminals from the connecting copper busbar, and an intermediate isolation enclosure in the middle of the C-shaped outer ring isolation enclosure for insulating and isolating the wiring terminals.

[0013] In some embodiments, optionally, the side of the insertion sleeve has a fixing hole for inserting and fixing the insertion sleeve with the outwardly protruding copper busbar insertion sleeve of the matching main circuit connector, and the fixing hole corresponds to the copper busbar fixing hole on the copper busbar insertion sleeve.

[0014] A transformer combined main circuit connector assembly includes a transformer, a main circuit connector and a copper busbar fastener. The transformer is the above-mentioned transformer. The front of the main circuit connector has a copper busbar insertion sleeve extending outward. The side of the copper busbar insertion sleeve has a copper busbar fixing hole. The transformer's insertion sleeve and the copper busbar insertion sleeve are plugged in and out of each other.

[0015] In some embodiments, optionally, the inserting sleeve is inserted into the outside of the copper busbar insertion sleeve, and the side of the inserting sleeve has a fixing hole, which corresponds to the copper busbar fixing hole on the copper busbar insertion sleeve. The copper busbar fastener passes through the fixing hole and the copper busbar fixing hole to fix the mutual inductor and the main circuit connector together.

[0016] A unit includes a three-phase transformer combination main circuit connector assembly and a connecting copper bar on the outgoing side. The transformer combination main circuit connector assembly is the above-mentioned transformer combination main circuit connector assembly. The connecting copper bar on the outgoing side passes through the transformer copper bar through-hole and is inserted into the copper bar insertion sleeve of the main circuit connector. The copper bar fastener passes through the fixing hole and the copper bar fixing hole to fix the connecting copper bar, the transformer and the main circuit connector together.

[0017] In some embodiments, optionally, the interphase centers of the three-phase main circuit connectors on the outgoing line side are arranged to correspond to the interphase centers of the corresponding phases of the circuit breaker, and the three-phase main circuit connectors on the outgoing line side are arranged in a triangular shape, with the B-phase main circuit connector in the middle position and the A-phase main circuit connector and the C-phase main circuit connector in the upper and lower positions staggered in the vertical direction. The transformer also includes a terminal, which is arranged on the front side of the transformer insulation shell, and the terminal is located on the wide side of the copper busbar through-hole away from the incoming line side.

[0018] The beneficial effects of the utility model are: achieving standardization of the mutual inductor fixing process, without changing the unit depth, without changing the non-lap main circuit connection structure, and without increasing the amount of connecting copper busbars.

[0019] The copper busbar fasteners pass through the fixing holes and the copper busbar fixing holes to fix the transformer and the main circuit connector together, which is equivalent to zero labor required for transformer installation.

[0020] It can meet the layout requirements of communication plug-ins for all current units in a cabinet with a width of 500mm. On this basis, the unit height can also be 150-200mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below with reference to the accompanying drawings and embodiments;

[0022] Figure 1 This is the layout diagram of the existing transformer;

[0023] Figure 2 This is the layout diagram of the existing B mutual inductor;

[0024] Figure 3 This is a schematic diagram of the assembly structure of the transformer core coil and the insulating rear shell of the utility model;

[0025] Figure 4 This is a front perspective structural diagram of the main body of the insulating front shell of the present invention;

[0026] Figure 5 This is a schematic diagram of the back three-dimensional structure of the main body of the insulating front shell of the present invention;

[0027] Figure 6This is a front perspective structural diagram of the transformer without the terminal cover installed;

[0028] Figure 7 This is a front perspective structural diagram of the mutual inductor of the present utility model;

[0029] Figure 8 This is a schematic diagram of the back three-dimensional structure of the mutual inductor of the present utility model;

[0030] Figure 9 This is a schematic structural diagram of the main circuit connector of the utility model;

[0031] Figure 10 This is a three-dimensional structural diagram of the 250A transformer combination main circuit connector assembly of the utility model;

[0032] Figure 11 yes Figure 10 Schematic diagram of the front structure;

[0033] Figure 12 yes Figure 11 AA cross-sectional view;

[0034] Figure 13 This is a schematic structural diagram of a 125A transformer combined main circuit connector assembly of the utility model;

[0035] Figure 14 This is a structural diagram of a 400A transformer combined main circuit connector assembly of the utility model;

[0036] Figure 15 This is a schematic diagram of the structure of a 630A transformer main circuit connector assembly with a matching 6×40mm copper busbar of the utility model;

[0037] Figure 16 This is a schematic diagram of the structure of a 630A transformer main circuit connector assembly with an 8×30mm copper busbar;

[0038] Figure 17 This is a three-dimensional layout diagram of the A and C phase mutual inductors in a unit with a cabinet width of 500 mm and a unit height of 200 mm of the 125A and 250A of the present invention;

[0039] Figure 18 This is a three-dimensional layout diagram of the A, B, and C phase mutual inductors in a unit with a cabinet width of 500 mm and a unit height of 200 mm of the present invention.

[0040] Figure 19 This is a three-dimensional layout diagram of the transformer in a unit of the utility model with a 100A cabinet width of 500mm and a unit height of 150;

[0041] Figure 20 This is a three-dimensional view of the arrangement of the mutual inductors in a 400A cabinet unit with a width of 500 mm according to the present invention;

[0042] Figure 21 This is a three-dimensional view of the arrangement of the mutual inductors in a 630A cabinet unit with a width of 500 mm according to the present invention;

[0043] Figure 22 yes Figure 21 A top view of

[0044] Figure 23 yes Figure 22 AA cross-sectional view;

[0045] Figure 24 This is a three-dimensional layout diagram of the transformer in a unit of the utility model with a 100A cabinet width of 600mm and a unit height of 150;

[0046] Figure 25 This is a three-dimensional layout diagram of the transformers in a unit with a cabinet width of 600mm and a unit height of 200mm of the 125 and 250A of the present invention;

[0047] Figure 26 This is a three-dimensional view of the arrangement of the transformers in a 400A cabinet unit with a width of 600 mm according to the present invention;

[0048] Figure 27 This is a three-dimensional view of the arrangement of the mutual inductors in a unit of a 630A cabinet with a width of 600 mm according to the present invention;

[0049] In the figure, 1. Transformer, 2. Transformer core coil, 3. Copper busbar through-hole, 4. Insertion sleeve, 5. Main circuit connector, 5-1. Phase A main circuit connector, 5-2. Phase B main circuit connector, 5-3. Phase C main circuit connector, 6. Copper busbar insertion sleeve, 7. Fixing hole, 8. Copper busbar fixing hole, 9. Terminal block, 10. Terminal block cover, 11. Copper busbar fastener, 12. Circuit breaker, 13-1. Insulating front shell, 13-2. Insulating rear shell, 14. Through-hole sleeve, 15. Isolation enclosure, 16. Wiring screws, 17. Connecting copper busbar, 18. Communication plug-in, 19. Auxiliary circuit connector. DETAILED DESCRIPTION

[0050] like Figures 3 to 8 As shown, a transformer 1 includes a transformer insulating shell that encloses a transformer core coil 2. The transformer insulating shell has a copper busbar through-hole 3. The back of the transformer insulating shell has an outwardly extending insertion sleeve 4 for being inserted into the outside of the outwardly extending copper busbar insertion sleeve 6 of a matching main circuit connector 5.

[0051] The side of the insertion sleeve 4 has a fixing hole 7 for insertion and fixing of the insertion sleeve 4 and the outwardly extending copper bar insertion sleeve 6 of the matched main circuit connector 5, and the fixing hole 7 corresponds to the copper bar fixing hole 8 on the copper bar insertion sleeve 6. Of course, it is not excluded that the insertion sleeve 4 is inserted and fixed with the copper bar insertion sleeve 6 through other fixing modes, such as clamping fixing mode.

[0052] The front of the transformer insulation shell has a wiring terminal 9. The periphery of the wiring terminal 9 has an isolation fence 15 for insulation isolation. The isolation fence 15 is in the shape of a mountain, including a C-shaped outer ring isolation fence for insulation isolation between the two wiring terminals 9 and the connecting copper bar 17, and a middle isolation fence in the middle of the C-shaped outer ring isolation fence for insulation isolation between the two wiring terminals 9. The side of the isolation fence 15 is open for easy wiring.

[0053] The isolation fence 15 makes the electrical clearance between the wiring terminal 9 on the front and the connecting copper bar 17 on the left side reach 17.5mm, and the standard requirement is 12.5-16mm.

[0054] The transformer insulation shell is divided into two parts, including an insulation front shell 13-1 and an insulation rear shell 13-2, and the annular transformer iron core coil 2 is located in the inner cavity of the transformer insulation shell. The insulation front shell 13-1 and the insulation rear shell 13-2 both have a via sleeve 14 constituting a copper bar via 3. The front and rear split insulation front shell 13-1 and the insulation rear shell 13-2 are fixed together by screws. Meanwhile, the insulation front shell 13-1 is also divided into a main body part and a wiring terminal cover plate 10, and the main body part and the wiring terminal cover plate 10 are fixed by screws. The isolation fence 15 is located on the wiring terminal cover plate 10, and the wiring terminal 9 is fixed through the matching structure on the main body part and the wiring terminal cover plate 10. The wiring terminal 9 exposed outside the wiring terminal cover plate 10 also has a wiring screw 16 on the head end.

[0055] The wiring terminal 9 is located on one side of the wide side of the copper bar via 3.

[0056] As shown in Figures 9 to 16 A transformer combined main circuit connector assembly, including a transformer 1, a main circuit connector 5 and a copper bar fastener 11, the transformer 1 is the transformer 1 described above, the front of the main circuit connector 5 has an outwardly extending copper bar insertion sleeve 6, the side of the copper bar insertion sleeve 6 has a copper bar fixing hole 8, the insertion sleeve 4 of the transformer 1 is inserted outside the copper bar insertion sleeve 6, and the copper bar fastener 11 passes through the fixing hole 7 and the copper bar fixing hole 8 to fix the transformer 1 and the main circuit connector 5 together.

[0057] As shown in Figures 17-27As shown, a unit includes a three-phase outgoing side mutual inductor combined main circuit connector assembly and a connecting copper bar 17. The three-phase outgoing side main circuit connector 5 is arranged in a triangular shape with the B-phase main circuit connector 5-2 in the middle position staggered and located outside the A-phase main circuit connector 5-1 and the C-phase main circuit connector 5-3 in the upper and lower positions in the vertical direction.

[0058] The main circuit connector 5 is a single structure, so that the horizontal and vertical spacings between the main circuit connectors 5 of different phases and the hole positions on the unit rear plate can be changed as needed.

[0059] The unit of the embodiment also includes a circuit breaker 12. The main circuit connectors 5 on the incoming side and the outgoing side are connected to the circuit breaker 12 in a non-lap main circuit connection structure.

[0060] The phase center distance of the circuit breaker 12 of 630A is generally 58mm, 46mm, 45mm, 44mm, 43.7mm, and the corresponding connecting copper bar 17 is generally 6×40mm, 6×35mm, 8×30mm, 8×35mm. The phase center distance of the circuit breaker 12 of 400A is generally 46mm, 45mm, 44mm, 43.7mm, and the corresponding connecting copper bar 17 is generally 6×30mm. The phase center distance of the circuit breaker 12 of 250A, 125A, 100A is generally 35mm, and the corresponding connecting copper bar 17 is generally 5×20mm, 3×20mm. There is also a 100A circuit breaker 12 with a phase center distance of 30mm, and the corresponding connecting copper bar 17 has a specification of 3×15mm.

[0061] The phase center distances of the circuit breakers 12 of different currents are different, and the outer dimensions of the connecting copper bars 17 are also different. The inner hole size of the mutual inductor core coil 2 is designed according to the outer dimensions of the connecting copper bar 17. The inner hole size of the mutual inductor core coil 2 determines the outer dimensions of the mutual inductor insulation shell, i.e., the outer dimensions of the mutual inductor 1.

[0062] The mutual inductor 1 of the embodiment meets the relevant technical parameter requirements of GB / T20840.2. The specifications of the mutual inductor 1 include 630A / 5A, 500A / 5A, 400A / 5A, 300A / 5A, 250A / 5A, 150A / 5A, 100A / 5A, 75A / 5A, and 60A / 5A. Among them, the mutual inductor combined main circuit connector assembly of 125A, 250A, 400A, and 630A is as shown in Figure 10 、 Figures 13-16 .

[0063] As Figure 22 As shown, the copper bars 17 for connecting the phases A, B and C can be configured as two short and one long, compared to the configuration of the copper bars 17 for connecting the phases A, B and C in the prior art. Figure 1 and 2 As shown, the amount of connecting copper bars 17 on the outgoing line side can be reduced.

[0064] The advantages of this solution are:

[0065] The structure of the transformer 1 and the main circuit connector 5 of this solution is fixed integrally, which changes the way in which the transformers 1 of phases A and C are fixed in front of the connecting copper busbar 17 in the prior art. The transformers 1 of phases A and C are fixed in an upper and lower arrangement at the rear of the connecting copper busbar 17, and the transformers 1 of phases A, B, and C can be conveniently connected at the front.

[0066] Furthermore, the fixing process of the mutual inductor 1 is standardized, the unit depth is unchanged, the non-lapped main circuit connection structure is unchanged, and the amount of connecting copper busbar 17 is not increased. The mutual inductor 1 is used in conjunction with the non-lapped main circuit connection structure, achieving modularization and standardization.

[0067] The transformer 1 is inserted into the main circuit connector 5 through the transformer insulation shell. The connecting copper bar 17 passes through the copper bar through-hole 3 of the transformer 1 and is inserted into the copper bar insertion sleeve 6 of the main circuit connector 5, thereby realizing a non-overlap connection between the connecting copper bar 17 and the main circuit connector 5. The copper bar fastener 11 passes through the fixing hole 7, the copper bar fixing hole 8 and the through-hole on the connecting copper bar 17 to fix the connecting copper bar 17, the transformer 1 and the main circuit connector 5 together, which is equivalent to zero labor required for the installation of the transformer 1.

[0068] The transformer 1 of this embodiment can use the transformer core coil 2 of the mature prior art, and only the inner hole size and outer size of the transformer core coil 2 are changed. The specification of the transformer core coil 2 is preferably current / 5A.

[0069] At the same time, the connection terminals 9 of the three-phase transformers 1 of A, B, and C are located on the front of the transformers 1, which reduces the height of the transformers 1. When the three-phase transformers 1 of A, B, and C are arranged in a triangular shape, the transformers 1 of A and C phases can be installed vertically. The reduction in the external dimensions of the transformers 1 reduces the upper and lower center distances between the main circuit connectors 5 of A and C phases, and also reduces the left and right center distances between the main circuit connectors 5 of B phase and the main circuit connectors 5 of A and C phases. The layout space of the auxiliary circuit connectors 19 of the unit is increased, ultimately meeting the requirement of arranging the communication plug-in 18 on units with a unit height of 150 mm and 200 mm. The communication plug-in 18 is specifically an RJ45 communication plug-in.

[0070] Specifically, the unit with a cabinet width of 500 mm and a unit height of 200 mm using the present scheme can be arranged with 32 wiring points of the auxiliary circuit connector 19 after arranging the communication connector 18, and can be arranged with 38 wiring points of the auxiliary circuit connector 19 if the communication connector 18 is not arranged.

[0071] The unit with a cabinet width of 500 mm and a unit height of 150 mm using the present scheme can be arranged with 12 wiring points of the auxiliary circuit connector 19 after arranging the communication connector 18, and can be arranged with 18 wiring points of the auxiliary circuit connector 19 if the communication connector 18 is not arranged.

[0072] The unit with a unit height of 350-400 mm using the present scheme can be arranged with 40 wiring points of the auxiliary circuit connector 19 after arranging the communication connector 18.

[0073] The unit with a cabinet width of 600 mm using the present scheme can be arranged with more wiring points of the auxiliary circuit connector 19.

[0074] In addition, the 100A unit can only use wire connection for the circuit breaker 12 and the main circuit connector 5 if the 150 mm unit height and the traditional transformer are used, and can only use the connection copper bar 17 for connection if the 200 mm unit height is used. When the 150 mm unit height is used, one device can have 12 units, and when the 200 mm unit height is used, one device can only have 9 units.

[0075] The center distance between phases of the 100A circuit breaker 12 of the 100A shell frame of the 100A unit is generally only 30 mm, and if the traditional transformer and its installation structure are used, the 100A circuit breaker 12 with a 35 mm center distance between phases of the 250A shell frame must be used. The procurement costs of the two are different, and the procurement price of the 100A circuit breaker 12 with the 250A shell frame is 230 yuan higher than that of the 100A circuit breaker 12 with the 100A shell frame, and the procurement price of the 100A circuit breaker 12 with the 250A shell frame of the foreign brand is even higher.

[0076] In Figures 17-27 , the transformer of phase B is located on the outer side of the triangular arrangement, which can realize the arrangement of more wiring points of the auxiliary circuit connector 19, but it is not excluded that the transformer of phase B is located on the inner side of the triangular arrangement.

[0077] In summary, the transformer structure of this solution can meet the requirements for a connection structure with consistent phase centers between the main circuit connector 5 and the circuit breaker 12 for various current levels, significantly improving process standardization. The transformer structure of this solution increases the number of grounding points for the auxiliary circuit connector 19 in a unit with a cabinet width of 500mm and a unit height of 200mm, and allows for the placement of a communication plug-in 18. It also enables a 100A circuit breaker with a phase center of 30mm in a unit with a unit height of 150mm to adopt a main circuit non-lap connection structure. This modularizes and standardizes the main circuit connection structure for various current levels in a unit with a cabinet width of 500mm, improves unit functionality, and provides communication connection capabilities.

Claims

1. A mutual inductor, characterized by: The invention comprises a transformer insulating shell enclosing a transformer core coil (2), the transformer insulating shell having a copper busbar through hole (3), and a back surface of the transformer insulating shell having an outwardly protruding insertion sleeve (4) for internal and external insertion cooperation with an outwardly protruding copper busbar insertion sleeve (6) of a matching main circuit connector (5).

2. The mutual inductor according to claim 1, characterized in that: It also includes a wiring terminal (9), which is arranged on the front side of the transformer insulation shell.

3. The mutual inductor according to claim 2, characterized in that: The connection terminal (9) is located on one side of the wide side of the copper busbar through hole (3).

4. The mutual inductor according to claim 2, characterized in that: The periphery of the wiring terminal (9) is provided with an isolation enclosure (15) for insulation isolation.

5. The mutual inductor according to claim 4, characterized in that: The isolation enclosure (15) is in the shape of a mountain, including a C-shaped outer ring isolation enclosure for insulating and isolating the connection terminals (9) and the connecting copper bar (17), and a middle isolation enclosure in the middle of the C-shaped outer ring isolation enclosure for insulating and isolating the connection terminals (9).

6. The mutual inductor according to claim 1, characterized in that: The side surface of the insertion sleeve (4) is provided with a fixing hole (7) for inserting and fixing the insertion sleeve (4) with the outwardly protruding copper busbar insertion sleeve (6) of the matching main circuit connector (5), and the fixing hole (7) corresponds to the copper busbar fixing hole (8) on the copper busbar insertion sleeve (6).

7. A transformer combined main circuit connector assembly, characterized by: The invention comprises a mutual inductor (1), a main circuit connector (5) and a copper busbar fastener (11); the mutual inductor (1) is the mutual inductor (1) as claimed in claim 1; the front of the main circuit connector (5) is provided with a copper busbar insertion sleeve (6) extending outward; the side of the copper busbar insertion sleeve (6) is provided with a copper busbar fixing hole (8); the insertion sleeve (4) of the mutual inductor (1) is fitted with the copper busbar insertion sleeve (6) in an internal and external manner.

8. The transformer combined main circuit connector assembly according to claim 7, characterized in that: The insert sleeve (4) is inserted into the outside of the copper busbar insert sleeve (6); a fixing hole (7) is provided on the side of the insert sleeve (4); the fixing hole (7) corresponds to a copper busbar fixing hole (8) on the copper busbar insert sleeve (6); a copper busbar fastener (11) passes through the fixing hole (7) and the copper busbar fixing hole (8) to fix the mutual inductor (1) and the main circuit connector (5) together.

9. A unit characterized by: The invention comprises a three-phase transformer combination main circuit connector assembly and a connecting copper bar (17) on the outgoing side, wherein the transformer combination main circuit connector assembly is the transformer combination main circuit connector assembly of claim 8, wherein the connecting copper bar (17) on the outgoing side passes through the copper bar through-hole (3) of the transformer and is inserted into the copper bar insertion sleeve (6) of the main circuit connector (5), and the copper bar fastener (11) passes through the fixing hole (7), the copper bar fixing hole (8) and the through-hole on the connecting copper bar (17) to fix the connecting copper bar (17), the transformer (1) and the main circuit connector (5) together.

10. The unit according to claim 9, characterized in that: The interphase centers of the three-phase main circuit connectors (5) on the outgoing line side are arranged in correspondence with the interphase centers of the corresponding phases of the circuit breaker (12); the B-phase main circuit connector (5-2) in the middle position of the three-phase main circuit connectors (5) on the outgoing line side is staggered with the A-phase main circuit connector (5-1) and the C-phase main circuit connector (5-3) in the upper and lower positions in the vertical direction to form a herringbone arrangement; wherein the mutual inductor further comprises a terminal (9); the terminal (9) is arranged on the front of the mutual inductor insulation housing; the terminal (9) is located on the wide side of the copper busbar through hole (3) away from the incoming line side.

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