CN223713830U - A converter - Google Patents

Abstract

The embodiment of the specification relates to the technical field of wind power generation, in particular to a converter. The current transformer that this description embodiment provided is including the female row of direct current connection, the female row of N electric capacity pond, the female row of N crowbar module and a plurality of switching, wherein, the female row of N electric capacity pond is arranged in proper order along predetermineeing the direction, and the female row of N electric capacity pond all is connected with the female row electricity of direct current connection, and every crowbar module all includes two crowbars of arranging in proper order along predetermineeing the direction, and the size of the female row of a plurality of switching is the same to every crowbar all is connected with the female row electricity of direct current connection through the female row of switching. According to the current transformer provided by the embodiment of the specification, the electric connection of the pry bar and the direct current connection busbar is realized by adopting the switching busbar, and the sizes of each switching busbar are the same, so that stray inductance generated by a circuit is reduced, the influence of ripple current is reduced, the impact force generated by the ripple current on the switching busbar is reduced, and the working reliability of the current transformer is ensured.

Description

Current transformer

Technical Field

The embodiment of the specification relates to the technical field of wind power generation, in particular to a converter.

Background

With the continuous improvement of the installed capacity of the wind generating set, the proportion of the generated capacity in the power grid is larger and larger, the frequency of falling faults of the power grid is higher and higher, and then the off-grid shutdown of the wind generating set can be caused, the off-grid shutdown of the wind generating set can not effectively provide voltage and frequency support for the power grid, and further the damage of the converter is caused. The new power grid rule is that a wind power grid-connected power generation system is required to have low voltage ride through capability, and a common scheme of the current wind power converter is to increase a crowbar on a direct current side to improve the fault ride through capability and adaptability of a wind turbine generator.

In the related art, most of the pry bars are connected with the direct current connection busbar through cables, stray inductance is easily generated in a circuit, and therefore the working reliability of the whole converter is reduced.

Therefore, a converter is needed to solve the above problems.

Disclosure of utility model

An object of the embodiment of the present disclosure is to provide a current transformer, so as to reduce stray inductance generated by a circuit, reduce influence of ripple current, reduce impact force generated by ripple current on a switching busbar, and ensure reliability of operation of the current transformer.

To achieve the purpose, the embodiment of the specification adopts the following technical scheme:

a current transformer, comprising:

The N capacitor cell busbar is sequentially arranged along a preset direction;

the direct current connection busbar is electrically connected with the N capacitor pool busbars;

N pry bar modules, each of which comprises two pry bars sequentially arranged along the preset direction, and

The plurality of switching busbar, the plurality of the size of switching busbar is the same, and every the pinch bar all pass through switching busbar with the female row electricity of direct current connection is connected.

As an alternative, the dc connection busbar includes N laminated busbars sequentially arranged along the preset direction, two adjacent laminated busbars are insulated from each other, and two adjacent laminated busbars are arranged, a partial area of one laminated busbar is overlapped on a partial area of the other laminated busbar, and each laminated busbar is electrically connected with the crowbar module;

Each laminated busbar comprises an input connecting end and an output connecting end which are arranged at intervals along the preset direction and are mutually communicated, and two adjacent arranged capacitor pool busbars are electrically connected through the laminated busbar.

Alternatively, two adjacent laminated busbar are detachably connected.

Alternatively, the distances from the input connection end to the output connection end in each of the stacked busbar are equal in length.

As an alternative, two stacked busbar arranged adjacently, wherein one stacked busbar has a first input connection end and a first output connection end, and the other stacked busbar has a second input connection end and a second output connection end, and the second input connection end is located between the first input connection end and the first output connection end;

and in the two adjacent pry bar modules, one pry bar in one pry bar module is positioned between the two pry bars in the other pry bar module.

Alternatively, the switching busbar comprises a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion are connected in an included angle mode, the first connecting portion is electrically connected with the laminated busbar, and the second connecting portion is electrically connected with the crowbar.

As an alternative, a first mounting hole is formed in the first connection portion, and each laminated busbar includes:

a plurality of conductive bars, wherein the conductive bars are stacked along the thickness direction of the laminated busbar;

Insulating separators, each of which is stacked on opposite sides of each of the conductive bars in a thickness direction thereof;

the conductive columns are connected with one side of each conductive row along the thickness direction, the end faces of the conductive columns, which extend out of the direct current connection busbar, are flush, and the first connection parts are abutted against the end faces of the corresponding conductive columns;

A first connecting nut connected to the other side of each conductive bar along the thickness direction, the first connecting nut being opposite to and penetrating the corresponding conductive column, and

The first connecting bolt sequentially penetrates through the first mounting hole and the conductive column to be in threaded connection with the first connecting nut.

As an alternative, the conductive bars are provided with first avoidance bits, and the first avoidance bits are used for the conductive columns on other conductive bars to pass through;

And a second avoidance position is arranged on the insulating partition plate and used for the corresponding conductive column to pass through.

Alternatively, each of the conductive bars extends outwardly with a connection pin, the connection pins forming the input connection or the output connection.

As an alternative, an insulating mounting hole is formed in the second connection portion, and the current transformer further includes:

The first insulator is embedded in the mounting plate of the pry bar;

And the second connecting bolt penetrates through the insulating mounting hole and is in threaded connection with the first insulator.

As an alternative, a second mounting hole is formed in the second connection portion, and the current transformer further includes:

The second connecting nut is embedded in the wiring end of the pry bar;

And the third connecting bolt penetrates through the second mounting hole and is in threaded connection with the second connecting nut.

As an alternative, the dc link busbar further includes:

a second insulator stacked on one of the adjacent two stacked parent rows, and

And the fourth connecting bolts sequentially penetrate through two adjacent laminated busbar and are in threaded connection with the second insulator.

The embodiment of the specification provides a converter, this converter is including the female row of direct current connection, the female row of N electric capacity pond, the female row of N crowbar module and a plurality of switching, wherein, the female row of N electric capacity pond is arranged in proper order along predetermineeing the direction, the female row of N electric capacity pond all is connected with the female row electricity of direct current connection, every crowbar module all includes two crowbars of arranging in proper order along predetermineeing the direction, the size of the female row of a plurality of switching is the same, and every crowbar all is connected with the female row electricity of direct current connection through the female row of switching. According to the current transformer provided by the embodiment of the specification, the electric connection of the pry bars and the direct current connection busbar is realized by adopting the switching busbar, and the sizes of the switching busbars are the same, so that the current paths between each pry bar and the direct current connection busbar are equal, stray inductance generated by a circuit is reduced, the influence of ripple current is reduced, the impact force of the ripple current on the switching busbar is reduced, and the working reliability of the current transformer is ensured.

Drawings

Fig. 1 is a schematic structural diagram of a current transformer according to an embodiment of the present disclosure;

Fig. 2 is a schematic diagram of a first partial structure of the current transformer according to the embodiment of the present disclosure;

fig. 3 is a schematic diagram of a second partial structure of the current transformer according to the embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a dc link busbar according to an embodiment of the present disclosure;

fig. 5 is an exploded view of the structure of the dc link busbar according to the embodiment of the present disclosure;

Fig. 6 is a schematic structural diagram of a switching busbar according to an embodiment of the present disclosure;

Fig. 7 is a partial structural sectional view of a current transformer provided in an embodiment of the present disclosure;

Fig. 8 is an enlarged view of the structure at a in fig. 7;

fig. 9 is an enlarged view of the structure at B in fig. 7.

In the figure:

1. A capacitor cell busbar; 101, a first output terminal, 102, a second output terminal, 103, a first input terminal, 104, a second input terminal;

2. Direct current connection busbar, 201, first input connection end, 202, first output connection end, 203, second input connection end, 204, second output connection end, 21, laminated busbar, 211, conductive row, 2111, first avoidance bit, 2112, connection pin, 212, insulating partition, 2121, second avoidance bit, 213, conductive column, 214, first connection nut, 215, first connection bolt, 22, second insulator, 23, fourth connection bolt;

3. The device comprises a pry bar module, a 31, a pry bar, a 311, a mounting plate, 312 and a wiring terminal;

4. The bus bar comprises a switching bus bar body, 41, a first connecting part, 411, a first mounting hole, 42, a second connecting part, 421, an insulating mounting hole, 422 and a second mounting hole;

5. The power module comprises a first insulator, a second connecting bolt, a second connecting nut and a power module.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the embodiments of the present specification more clear, the technical solutions of the embodiments of the present specification are further described below by specific embodiments with reference to the accompanying drawings.

In the description of the embodiments of the present specification, unless explicitly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may, for example, be fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected through intermediaries, or in communication between two elements or in interaction with each other. The specific meaning of the terms in the embodiments of the present specification will be understood in detail by those skilled in the art.

In the present description embodiments, unless expressly specified and limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include both the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present specification. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

As shown in fig. 1, this embodiment provides a current transformer, this current transformer includes that direct current connects female row 2, N female row 1 of electric capacity pond and N crowbar module 3, wherein, N female row 1 of electric capacity pond arranges in proper order along predetermineeing the direction, and N female row 1 of electric capacity pond all is connected with female row 2 electricity of direct current connection, so that exchange direct current conversion, every crowbar module 3 all includes two crowbar 31 of arranging in proper order along predetermineeing the direction, and every crowbar 31 all is connected with female row 2 electricity of direct current connection. The crowbar 31 is electrically connected to the direct current connection busbar 2, so that the protection of a circuit is improved, and the fault ride-through capability and the adaptability of the wind turbine generator are improved. It should be noted that, in this embodiment, the current transformer further includes a plurality of power modules 8, and each capacitor cell busbar 1 is electrically connected with a power module 8. In this embodiment, the preset direction is the extending direction of the dc connection busbar 2.

Alternatively, in this embodiment, two capacitor cell busbar 1 are designed, and in other embodiments, four or more capacitor cell busbar 1 may be provided that N is an even number.

In the related art, most of the crowbar 31 is connected with the direct current connection busbar 2 through a cable, and the cable is easy to cause inconsistent length of the cable in the wiring connection process, so that parasitic parameters of each phase of the circuit are different, stray inductance is generated in the circuit, the influence of ripple current is increased, large impact force is easily brought to the cable due to large current instantaneously brought by the ripple current, and the working reliability of the whole converter is further reduced.

In order to solve the above-mentioned problem, as shown in fig. 1 and 2, the current transformer provided in this embodiment further includes a plurality of switching busbar 4, the plurality of switching busbar 4 have the same size, and each crowbar 31 is electrically connected to the dc link busbar 2 through the switching busbar 4. According to the current transformer provided by the embodiment, the electric connection between the pry bar 31 and the direct current connection busbar 2 is realized by adopting the switching busbar 4, and the sizes of the switching busbars 4 are the same, so that the current paths between each pry bar 31 and the direct current connection busbar 2 are equal, stray inductance generated by a circuit is reduced, the influence of ripple current is reduced, the impact force generated by the ripple current on the switching busbar 4 is further reduced, and the working reliability of the current transformer is ensured.

Optionally, in this embodiment, as shown in fig. 2 and 3, the dc connection busbar 2 includes N laminated busbars 21 sequentially arranged along a preset direction, two adjacent laminated busbars 21 are insulated from each other, and in the two laminated busbars 21 adjacently arranged, a partial area of one laminated busbar 21 is overlapped on a partial area of the other laminated busbar 21, each laminated busbar 21 is electrically connected with a crowbar module 3, each laminated busbar 21 includes an input connection end and an output connection end which are arranged at intervals along the preset direction and are mutually conducted, and two adjacent capacitor cell busbars 1 are electrically connected through the laminated busbar 21. Specifically, in two adjacent arranged capacitor cell busbar 1, two output terminals are arranged on one capacitor cell busbar 1 at intervals, the two output terminals are respectively and electrically connected with two corresponding input connection ends, two input terminals are arranged on the other capacitor cell busbar 1 at intervals, and the two input terminals are respectively and electrically connected with two corresponding output connection ends. The structural design of the direct current connection busbar 2 effectively reduces the overall size of the direct current connection busbar 2, so that the direct current connection busbar 2 is flexible to use and convenient to maintain.

Optionally, in this embodiment, the two adjacent laminated busbar 21 are detachably connected, so that maintenance on the dc connection busbar 2 is facilitated. In other embodiments, two adjacent laminated busbar 21 may be fixedly connected by bonding or riveting, so as to ensure the stability and reliability of connection and fixation between two adjacent laminated busbar 21.

Alternatively, in the present embodiment, the distances from the input connection end to the output connection end in each laminated busbar 21 are equal in length. Because each laminated busbar 21 comprises the input connecting ends and the output connecting ends which are arranged along the preset direction at intervals and are mutually communicated, when the direct current connecting busbar 2 performs alternating current and direct current, the current flowing into the input connecting end of one laminated busbar 21 from the first capacitor pond busbar 1 flows out to the second capacitor pond busbar 1 through the output connecting end of the laminated busbar 21, so that a current conversion path is formed, the lengths of the current conversion paths on the direct current connecting busbar 2 are all the distances between the input connecting ends and the output connecting ends of the laminated busbar 21, and the distances from the input connecting ends to the output connecting ends in each laminated busbar 21 are equal, so that the current conversion paths formed by the direct current connecting busbar 2 are short and equal, the current conversion is uniform, the generated stray inductance and ripple inductance between the power modules 8 are further reduced, electromagnetic interference is relieved, the influence of the local temperature of the direct current connecting busbar 2 on the current conversion is avoided, and the reliability of the direct current connecting busbar 2 is ensured. It should be noted that the number of the stacked busbar 21 in the dc connection busbar 2 is identical to the number of the capacitor cell busbar 1, that is, in this embodiment, the dc connection busbar 2 includes two stacked busbars 21 sequentially arranged along a predetermined direction.

In this embodiment, as shown in fig. 3 and 4, in two stacked busbar 21 arranged adjacently, the input connection end of one stacked busbar 21 is a first input connection end 201, the input connection end of the other stacked busbar 21 is a second input connection end 203, the output connection end of one stacked busbar 21 is a first output connection end 202, the output connection end of the other stacked busbar 21 is a second output connection end 204, and the second input connection end 203 is located between the first input connection end 201 and the first output connection end 202. The arrangement mode of the two adjacent laminated busbar 21 is more convenient for electrically connecting the direct current connection busbar 2 with each capacitor cell busbar 1, and ensures that each current exchanging path formed by the direct current connection busbar 2 is short and equal in length.

It should be noted that, in this embodiment, as shown in fig. 2, the two adjacent laminated busbar 21 are arranged in such a way that, among the two adjacent crowbar modules 3, one crowbar 31 of one crowbar module 3 is located between two crowbar 31 of the other crowbar module 3.

Specifically, as shown in fig. 3, in two adjacent capacitor cell busbar 1, two output terminals on one capacitor cell busbar 1 are respectively a first output terminal 101 and a second output terminal 102, two input terminals on the other capacitor cell busbar 1 are respectively a first input terminal 103 and a second input terminal 104, the first output terminal 101 is electrically connected with the first input connection terminal 201, the first output connection terminal 202 is electrically connected with the first input terminal 103, so that current on one capacitor cell busbar 1 flows into the other capacitor cell busbar 1 after sequentially passing through the first output terminal 101, the first input connection terminal 201, the first output connection terminal 202 and the first input terminal 103, thereby forming a commutation path, the second output terminal 102 is electrically connected with the second input connection terminal 203, the second output connection terminal 204 is electrically connected with the second input terminal 104, and current on one capacitor cell busbar 1 sequentially passes through the second output terminal 102, the second input connection terminal 203, the second output connection terminal 204 and the second input terminal 104, and then flows into the other capacitor cell busbar 1, thereby ensuring that two commutation paths are formed.

Alternatively, in the present embodiment, the output terminals and the corresponding input connection terminals are each designed in the form of pins, and the electrical connection is achieved by bolts, and the input terminals and the corresponding output connection terminals are each designed in the form of pins, and the electrical connection is achieved by bolts.

In this embodiment, as shown in fig. 4 and 5, the dc link busbar 2 further includes a second insulator 22 and a fourth link bolt 23, where the second insulator 22 is stacked on one of the two adjacent stacked busbar 21, and the fourth link bolt 23 sequentially passes through the two adjacent stacked busbar 21 and is screwed with the second insulator 22. The arrangement realizes the insulation detachable connection between two adjacent laminated busbar 21, and has simple structure and convenient installation and disassembly. Alternatively, in the present embodiment, the second insulator 22 is internally provided with an internal thread so as to be screwed with the fourth connecting bolt 23. Optionally, the end part of the second insulator 22 far away from the fourth connecting bolt 23 is also provided with an internal thread, and the second insulator 22 can be connected with the second insulator 22 through the bolt penetrating through the cabinet body of the converter, so that the installation and fixation of the direct current connection busbar 2 on the cabinet body are realized, and the installation stability of the direct current connection busbar 2 is ensured. Optionally, in this embodiment, a plurality of fourth connecting bolts 23 are disposed at intervals along the preset direction, the plurality of fourth connecting bolts 23 are disposed in one-to-one correspondence with the plurality of second insulators 22, and the plurality of fourth connecting bolts 23 and the plurality of second insulators 22 are used for jointly realizing the installation and fixation of the two adjacent laminated busbar 21, so that stability and reliability of fixation between the two adjacent laminated busbar 21 are further ensured. Alternatively, in the present embodiment, four fourth connecting bolts 23 are provided at intervals, and in other embodiments, the specific number of fourth connecting bolts 23 may be set as required.

In this embodiment, as shown in fig. 6 to 9, the switching busbar 4 includes a first connecting portion 41 and a second connecting portion 42 that are connected, the first connecting portion 41 and the second connecting portion 42 are connected at an included angle, the first connecting portion 41 is electrically connected with the laminated busbar 21, and the second connecting portion 42 is electrically connected with the crowbar 31. Above-mentioned switching busbar 4's structural design for switching busbar 4's both ends all are convenient for carry out the electricity with corresponding department and are connected, and simple structure, be convenient for process. Alternatively, the transfer busbar 4 may be a copper busbar, and the first connection portion 41 performs a bending operation with respect to the second connection portion 42.

In this embodiment, as shown in fig. 6 to 8, a first mounting hole 411 is formed in the first connection portion 41, each laminated busbar 21 includes an insulating partition 212, a conductive post 213, a first connection nut 214, a first connection bolt 215 and a plurality of conductive rows 211, wherein the plurality of conductive rows 211 are stacked along the thickness direction of the laminated busbar 21, the insulating partition 212 is stacked on two opposite sides of each conductive row 211 along the thickness direction, one side of each conductive row 211 along the thickness direction is connected with the conductive post 213, the end faces of each conductive post 213 extending out of the direct current connection busbar 2 are flush, the end faces of each conductive post 213 are respectively abutted with the first connection portion 41, the other side of each conductive row 211 along the thickness direction is connected with the first connection nut 214, the first connection nut 214 is opposite to and penetrates through the corresponding conductive post 213, and the first connection bolt 215 sequentially penetrates through the first mounting hole 411 and the conductive post 213 to be in threaded connection with the first connection nut 214. The first connection portion 41 is electrically connected with the laminated busbar 21 by providing the conductive posts 213, the first connection nuts 214, and the first connection bolts 215, so that the structure is simple and the connection is reliable. In addition, the above-mentioned laminated busbar 21 is structurally arranged, so that an insulating partition 212 is clamped between two adjacent conductive rows 211, thereby ensuring the insulating effect between the conductive rows 211 with different polarities and meeting the safety regulations. In addition, the adjacent two conductive bars 211 are insulated by the insulating partition 212, so that compared with the traditional method of insulating the adjacent two conductive bars 211 by an insulating film, the insulating partition 212 does not need to be subjected to hot pressing treatment, and the processing cost is greatly reduced. Alternatively, in this embodiment, the insulating spacer 212 may be made of fiberglass or epoxy. It should be noted that, in this embodiment, each laminated busbar 21 includes three conductive rows 211, one conductive row 211 is a positive conductive row, one conductive row 211 is a negative conductive row, and one conductive row 211 is an N-pole conductive row.

In this embodiment, as shown in fig. 5, each conductive row 211 extends outward with a connection pin 2112, and the connection pins 2112 form an input connection terminal or an output connection terminal. In addition, it should be noted that, each conductive row 211 forms overhanging connection pins 2112 through bending operation, and the specific number of connection pins 2112 on each conductive row 211 is set correspondingly according to the polarity of the conductive row 211, and since the specific number of connection pins 2112 on the conductive row 211 belongs to the prior art, the description thereof will not be repeated here.

Optionally, in this embodiment, as shown in fig. 8, a first avoidance position 2111 is disposed on the conductive strip 211, the first avoidance position 2111 is used for allowing the conductive columns 213 on other conductive strips 211 to pass through, a second avoidance position 2121 is disposed on the insulating partition 212, and the second avoidance position 2121 is used for allowing the corresponding conductive columns 213 on the conductive strip 211 to pass through. Optionally, in this embodiment, the first avoidance position 2111 and the second avoidance position 2121 may be designed into a manner of avoiding a gap, or may be set into a manner of avoiding a hole, so long as it is ensured that the size of the avoidance gap and the size of the avoidance hole are far greater than the outer diameter of the conductive column 213.

In this embodiment, as shown in fig. 7, the second connecting portion 42 is provided with an insulating mounting hole 421, and the converter further includes a first insulator 5 and a second connecting bolt 6, where the first insulator 5 is embedded in the mounting plate 311 of the crowbar 31, and the second connecting bolt 6 passes through the insulating mounting hole 421 and is in threaded connection with the first insulator 5. Through setting up first insulator 5 and second connecting bolt 6, can be with the second connecting portion 42 insulation fixing of the female row of switching 4 on the mounting panel 311 of crowbar 31, realized the insulation fixing to the female row of switching 4, guaranteed the stability of the female row of switching 4 relative position. Alternatively, in the present embodiment, the mounting plate 311 may be in the form of a sheet metal member.

Optionally, in this embodiment, as shown in fig. 7 and 9, the second connecting portion 42 is provided with a second mounting hole 422, and the converter further includes a second connecting nut 7 and a third connecting bolt (not shown in the drawings), where the second connecting nut 7 is embedded in the terminal 312 of the crowbar 31, and the third connecting bolt passes through the second mounting hole 422 and is in threaded connection with the second connecting nut 7. The above arrangement realizes the electrical connection between the second connecting portion 42 and the crowbar 31, and has simple structure and reliable connection.

It is to be understood that the above examples of the embodiments of the present disclosure are presented solely for the purposes of clarity and illustration and are not intended to limit the implementation of the embodiments of the present disclosure. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the embodiments of the present description are intended to be included within the scope of the claims of the embodiments of the present description.

Claims (12)

1. A current transformer, comprising:

The capacitor cell busbar (1) comprises N capacitor cell busbar (1), wherein the N capacitor cell busbar (1) are sequentially arranged along a preset direction;

The direct current connection busbar (2), and the N capacitor pool busbars (1) are electrically connected with the direct current connection busbar (2);

N crow bar modules (3), each crow bar module (3) comprises two crow bars (31) which are sequentially arranged along the preset direction, and

The plurality of switching busbar (4), a plurality of the size of switching busbar (4) is the same, and every pinch bar (31) all pass through switching busbar (4) with the female row (2) electricity of direct current connection.

2. The converter according to claim 1, characterized in that said dc link busbar (2) comprises N laminated busbars (21) arranged in sequence along said predetermined direction, adjacent two of said laminated busbars (21) being insulated from each other and in that, of said two laminated busbars (21) arranged adjacent to each other, a partial area of one of said laminated busbars (21) is superposed on a partial area of the other laminated busbar (21), each of said laminated busbars (21) being electrically connected to said crowbar module (3);

Each laminated busbar (21) comprises an input connecting end and an output connecting end which are arranged at intervals along the preset direction and are mutually communicated, and two adjacent arranged capacitor cell busbars (1) are electrically connected through the laminated busbar (21).

3. A current transformer according to claim 2, characterized in that adjacent two of said laminated busbar (21) are detachably connected.

4. A current transformer according to claim 2, characterized in that the distance from the input connection to the output connection in each of the laminated busbar (21) is equal.

5. The converter according to any of claims 2-4, characterized in that in two stacked busbar (21) arranged adjacently, one of the stacked busbar (21) has a first input connection (201) and a first output connection (202), the other stacked busbar (21) has a second input connection (203) and a second output connection (204), the second input connection (203) being located between the first input connection (201) and the first output connection (202);

In the two adjacent arranged pry bar modules (3), one pry bar (31) in one pry bar module (3) is positioned between two pry bars (31) in the other pry bar module (3).

6. The converter according to any one of claims 2 to 4, wherein the switching busbar (4) includes a first connecting portion (41) and a second connecting portion (42) that are connected, the first connecting portion (41) and the second connecting portion (42) are connected in an included angle, the first connecting portion (41) is electrically connected with the laminated busbar (21), and the second connecting portion (42) is electrically connected with the crowbar (31).

7. The current transformer according to claim 6, wherein the first connection portion (41) is provided with a first mounting hole (411), and each laminated busbar (21) includes:

A plurality of conductive bars (211), the plurality of conductive bars (211) being stacked in a thickness direction of the stacked busbar (21);

an insulating separator (212), each of the conductive bars (211) being stacked with the insulating separator (212) on opposite sides thereof in a thickness direction;

The conductive columns (213) are connected to one side of each conductive row (211) along the thickness direction of the conductive rows, the end faces of the conductive columns (213) extending out of the direct current connection busbar (2) are flush, and the first connection parts (41) are abutted to the end faces of the corresponding conductive columns (213);

A first connection nut (214), the other side of each conductive row (211) along the thickness direction is connected with the first connection nut (214), the first connection nut (214) is opposite to and penetrates through the corresponding conductive column (213), and

The first connecting bolt (215) sequentially penetrates through the first mounting hole (411) and the conductive column (213) to be in threaded connection with the first connecting nut (214).

8. The current transformer according to claim 7, wherein the conductive bar (211) is provided with a first avoidance bit (2111), the first avoidance bit (2111) being used for the conductive column (213) on the other conductive bar (211) to pass through;

The insulating partition plate (212) is provided with a second avoidance bit (2121), and the second avoidance bit (2121) is used for allowing the corresponding conductive column (213) to pass through.

9. The current transformer according to claim 7, characterized in that each of the conductor bars (211) extends outwardly with a connection pin (2112), which connection pin (2112) forms the input connection or the output connection.

10. The current transformer according to claim 6, wherein the second connection portion (42) is provided with an insulating mounting hole (421), and the current transformer further comprises:

The first insulator (5) is embedded in the mounting plate (311) of the pry bar (31);

and the second connecting bolt (6) penetrates through the insulating mounting hole (421) and is in threaded connection with the first insulator (5).

11. The current transformer according to claim 6, wherein the second connection portion (42) is provided with a second mounting hole (422), and the current transformer further comprises:

the second connecting nut (7) is embedded in the wiring end (312) of the pry bar (31);

And a third connecting bolt passes through the second mounting hole (422) and is in threaded connection with the second connecting nut (7).

12. The converter according to any of claims 2-4, wherein the dc link busbar (2) further comprises:

A second insulator (22), the second insulator (22) being stacked on one of the adjacent two stacked busbar (21), and

And the fourth connecting bolts (23) sequentially penetrate through two adjacent laminated busbar (21) to be in threaded connection with the second insulator (22).