CN112073043A - Branch switch assembly for direct current circuit breaker - Google Patents
Branch switch assembly for direct current circuit breaker Download PDFInfo
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- CN112073043A CN112073043A CN201910502543.6A CN201910502543A CN112073043A CN 112073043 A CN112073043 A CN 112073043A CN 201910502543 A CN201910502543 A CN 201910502543A CN 112073043 A CN112073043 A CN 112073043A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/567—Circuits characterised by the use of more than one type of semiconductor device, e.g. BIMOS, composite devices such as IGBT
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention relates to a branch switch assembly for a direct current breaker, which comprises an assembly frame, wherein an IGBT valve section and a main loop diode valve section are arranged on the assembly frame, a power supply unit is also arranged on the assembly frame, the main loop diodes and the corresponding IGBT units and the corresponding main loop diodes are electrically connected through a conductive connecting structure to form corresponding branch switch circuits, the conductive connecting structure comprises a plurality of laminated busbars arranged below the IGBT valve section and the main loop diode valve section, conductive connecting parts are arranged on the main loop diode valve section and the IGBT valve section, and the laminated busbars are correspondingly and electrically connected with the conductive connecting parts. The laminated busbar is arranged below the main circuit diode valve section and the IGBT valve section, so that the influence on the installation gap between the main circuit diode valve section and the IGBT valve section can be avoided, the installation gap between the two valve sections can be reduced, and the structure of the whole branch switch assembly is more compact. And the installation space is larger when the connection is carried out, and the installation is more convenient.
Description
Technical Field
The invention relates to a branch switch assembly for a direct current breaker.
Background
The hybrid direct current circuit breaker comprises a main branch, a transfer branch and an energy consumption branch which are connected in parallel, and a plurality of switch power modules are arranged on the main branch and the transfer branch in series. The topological structure of the switching power module mainly comprises an IGBT submodule, an IGBT submodule of an H-bridge structure, a submodule formed by a diode bridge and the like. A common circuit topology is as the full-bridge module that is used for establishing ties in proper order of circuit breaker as disclosed in the chinese utility model patent that the publication number is CN207304391U, every full-bridge module includes 2 IGBT, 4 diode and 1 electric capacity unit, and the electric capacity unit is including the anti-diode and the electric capacity of preventing of establishing ties, and just corresponds to prevent that anti-diode and electric capacity are parallelly connected respectively and set up resistance. When a plurality of such submodules are connected in series to form a high-voltage unit, the problems of more diodes, complex structure, high cost and great difficulty in manufacturing exist.
The invention discloses a high-voltage direct-current circuit breaker in Chinese patent application with application publication number CN108462486A, which adopts a novel branch circuit electronic switch circuit, the branch circuit electronic switch circuit comprises a first branch circuit and a second branch circuit which are arranged in parallel, a plurality of diodes are sequentially and reversely connected in series in each branch circuit, a corresponding cathode series point and an anode series point are formed on each branch circuit, a power device unit is arranged between the anode series point of one branch circuit and the cathode series point of the other branch circuit, corresponding capacitor units are also connected in parallel at two ends of the power device unit, each capacitor unit comprises a capacitor and an anti-reverse diode which are sequentially connected in series, and the direction of the power device unit is from the anode series point of one branch circuit to the cathode series point of the other branch circuit. In the switch structure, the bidirectional conduction characteristic of the electronic switch can be ensured, and the number of used diodes is effectively reduced.
In order to simplify the overall structure, the assembly arrangement of devices such as IGBTs and diodes in the branch circuit assembly needs to be redesigned so as to meet the requirement of miniaturization design of the branch circuit switch. The prior design adopts the structure of the power electronic branch of the ultra-high voltage direct current breaker as disclosed in the Chinese utility model with the publication number of CN207588689U to assemble the branch component, the IGBT and diode structures required in the assembly are designed into a pressure welding type valve section, then the valve sections are arranged on an assembly frame in a module form, the assembly frame comprises two bracket beams positioned at two ends and a plurality of connecting beams arranged in the middle, when in installation, the two ends of the corresponding valve sections are correspondingly and fixedly arranged on the two support beams, and the copper bars are arranged between the valve sections to realize the conductive connection of devices between different valve sections, so that the convenience of the copper bar connection and the size of the branch assembly have contradiction, if design great clearance between valve section and valve section, admittedly can conveniently connect the copper bar, nevertheless can make branch road subassembly overall structure great. And if design less clearance between valve section and valve section, though can reduce branch road subassembly overall structure size, nevertheless inconvenient realization copper bar connection again, both are difficult to compromise.
Disclosure of Invention
The invention provides a branch switch assembly for a direct current circuit breaker, which has a compact structure and is convenient to connect between valve sections.
In order to achieve the purpose, the technical scheme of the branch switch component for the direct current breaker provided by the invention is as follows:
the branch switch component for the direct current breaker comprises a component frame, wherein an IGBT valve section and a main circuit diode valve section which are sequentially arranged along the front-back direction and extend along the left-right direction are arranged on the component frame, a power supply unit for supplying power to the IGBT valve section is also arranged on the component frame, the main circuit diode valve section comprises a plurality of main circuit diodes which are sequentially pressed, the IGBT valve section comprises a plurality of IGBT units which are sequentially pressed, the main circuit diodes and the corresponding IGBT units and the corresponding main circuit diodes are electrically connected through an electrically conductive connecting structure to form a corresponding branch switch circuit, the electrically conductive connecting structure comprises a plurality of laminated busbars which are arranged below the IGBT valve section and the main circuit diode valve section and are arranged along the left-right direction, corresponding electrically conductive connecting parts are respectively arranged at the bottoms of the main circuit diode valve section and the IGBT valve section, which correspond to the electrically conductive connecting parts on the main circuit diode valve section and the IGBT valve section, so as to realize the conductive connection between the corresponding IGBT unit and the corresponding main loop diode.
The invention has the beneficial effects that: according to the branch switch for the direct current breaker, the IGBT valve section and the main circuit diode valve section are in conductive connection through the laminated busbar, the laminated busbar is arranged below the main circuit diode valve section and the IGBT valve section, the influence on the installation gap between the main circuit diode valve section and the IGBT valve section can be avoided, the installation gap between the two valve sections can be reduced to the greatest extent, and the structure of the whole branch switch assembly is more compact. In addition, during connection, as the lower part is in conductive connection, the installation space is large, the influence of the installation gap between the main loop diode valve section and the IGBT valve section is avoided in the connection process, and the installation is also convenient.
Furthermore, the laminated busbar is provided with an IGBT terminal which is electrically and fixedly connected with the corresponding conductive connecting part on the IGBT valve section and a main loop diode terminal which is electrically and fixedly connected with the corresponding conductive connecting part on the main loop diode valve section, the IGBT terminal and the main loop diode terminal respectively comprise an anode terminal and a cathode terminal, and at least one of the anode terminal and the cathode terminal in the IGBT terminal and/or the main loop diode terminal is of a soft connecting terminal structure. The soft connecting terminal structure is suitable for a crimping valve section structure, connection redundancy is large, crimping precision of the valve section can be reduced by connecting the valve sections through the soft connecting terminal structure, and conductive connection performance is guaranteed.
Furthermore, the IGBT valve section comprises an IGBT radiator arranged corresponding to an IGBT in the IGBT unit, the main loop diode valve section comprises a main loop diode radiator arranged corresponding to a main loop diode, a conductive connecting part on the main loop diode valve section is arranged on the main loop diode radiator, a conductive connecting part on the IGBT valve section is arranged on the IGBT radiator, an IGBT terminal on the laminated busbar is electrically and fixedly connected with the corresponding IGBT radiator, and a main loop diode terminal on the laminated busbar is electrically and fixedly connected with the corresponding main loop diode radiator. The corresponding radiators are utilized to realize the conductive connection with the corresponding terminals on the laminated busbar, and the installation and the connection are both convenient.
Further, still be equipped with on the subassembly frame through the female parallel arrangement of the one-to-one correspondence of stromatolite arranges the electric capacity unit at each IGBT unit both ends, each electric capacity unit is including electrically conductive series arrangement in proper order preventing reverse diode and electric capacity respectively, and all electric capacity units prevent that the reverse diode is followed left and right directions pressure equipment in proper order and is formed and prevent reverse diode valve section, and the electric capacity of all electric capacity units is arranged along left and right directions in proper order and is set firmly form electric capacity module on the subassembly frame, make up electric capacity module with each and install simple and conveniently, and the modularization degree is high.
Furthermore, IGBT valve section, major loop diode valve section, prevent that anti-diode valve section and electric capacity module arrange in proper order along the fore-and-aft direction on the subassembly frame, because electric capacity module is bulky, set up electric capacity module in the edge and be convenient for install and change.
Furthermore, the laminated busbar is provided with an anti-reverse diode terminal which is correspondingly and electrically connected with the anti-reverse diode and a capacitor terminal which is electrically connected with a corresponding capacitor, the laminated busbar is L-shaped and provided with a cross arm part and a vertical arm part, the cross arm part of the laminated busbar is positioned below the anti-reverse diode valve section, the main loop diode valve section and the IGBT valve section, the vertical arm part is positioned between the anti-reverse diode valve section and the capacitor module, the IGBT terminal, the main-loop diode terminal and the anti-reverse diode terminal are arranged on the horizontal arm part, the capacitance terminal is arranged on the vertical arm part, because the side of the capacitor facing the lower side needs to be fixed, the laminated busbar is arranged into an L shape, the transverse arm part is in conductive connection with the anti-reflection diode valve section, the main loop diode valve section and the IGBT valve section, and the vertical wall part is in conductive connection with the capacitor module, so that the capacitor is convenient to install and connect.
Furthermore, anti-reverse diode radiators are respectively arranged on the left side and the right side of each anti-reverse diode in the anti-reverse diode valve section, a diode resistor arranged in parallel with the anti-reverse diode is arranged between the anti-reverse diode radiators on the two sides of any anti-reverse diode, and the connection of the diode resistors between the radiators is simple.
Furthermore, each capacitor is connected with a capacitor resistor in parallel.
Drawings
Fig. 1 is a schematic structural diagram of a branch switch assembly for a dc circuit breaker according to an embodiment of the present invention;
FIG. 2 is a top view of the bypass switch assembly shown in FIG. 1;
FIG. 3 is a bottom view of the bypass switch assembly of FIG. 1;
fig. 4 is a schematic structural diagram of the laminated busbar in fig. 3;
FIG. 5 is a schematic structural view of the module frame of FIG. 1;
FIG. 6 is a schematic diagram of a branch switch circuit of the branch switch assembly of FIG. 1;
description of reference numerals: 1-a component frame; 11-mounting the beam; 12-a connecting beam; 2-power magnetic ring unit; 3-IGBT valve section; 31-1 dragging 2 drive plates; 4-main loop diode valve section; 5-anti-reverse diode valve section; 51-diode resistance; 6-a capacitive module; 61-capacitive resistance; 7-laminated busbar; 71-a flexible connection structure; 72-terminal hole configuration; 8-a central control unit.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The invention discloses a specific embodiment of a branch switch component for a direct current breaker, which comprises the following steps:
for ease of understanding, the circuit principles corresponding to the branch switch assembly shown in fig. 1-3 will be described. The circuit principle is as shown in fig. 6, the branch switch circuit corresponding to the branch switch assembly comprises two branches which are arranged in parallel, a plurality of main loop diodes are sequentially and reversely connected in series in each branch, a corresponding cathode series point and an anode series point are formed on each branch, an IGBT unit is arranged between the anode series point of one branch and the cathode series point of the other branch, corresponding capacitor units are further connected in parallel at two ends of the IGBT unit, each capacitor unit comprises a capacitor and an anti-reverse diode which are sequentially connected in series, and the direction of the IGBT unit is from the anode series point of one branch to the cathode series point of the other branch. The circuit structure is the same as that of the electronic switch disclosed in the chinese invention patent application with application publication No. CN108462486A, and is not described herein again.
In terms of a circuit, the branch switch structure can not only ensure the bidirectional conduction characteristic of the electronic switch, but also effectively reduce the number of used diodes and effectively reduce the cost of the whole branch switch assembly.
The specific structure of the branch switch assembly is described in detail below:
as shown in fig. 1, 2 and 3, the branch switch assembly integrally includes an assembly frame 1 at the bottom, and a power supply unit, a central control unit 8, an IGBT valve section 3, a main loop diode valve section 4, an anti-reverse diode valve section 5 and a capacitor module 6 are sequentially arranged on the assembly frame 1 from front to back.
As shown in fig. 1 to 3 and 5, the assembly frame 1 includes mounting beams 11 located at both sides of the branch switch assembly and extending in the front-rear direction, and connecting beams 12 located between the two mounting beams 11, where the mounting beams 11 are aluminum channel steel, and the connecting beams 12 are insulating beams, and there are four connecting beams, this time, a first connecting beam, a second connecting beam, a third connecting beam, and a fourth connecting beam. The four connecting beams 12 are sequentially arranged in the mounting beam groove at intervals from front to back and are fixed with the mounting beam 11 at the end part of the connecting beam 12 through bolts. The IGBT valve section 3, the main loop diode valve section 4 and the anti-reverse diode valve section 5 are correspondingly arranged on the mounting beam 11, and the power supply unit, the central control unit 8 and the capacitor unit are all arranged on the connecting beam 12. The capacitor unit in this embodiment is mainly composed of a capacitor and an anti-reverse diode connected in series. In practice, fig. 6 mainly shows the mounting beams 11 at both ends, not all the connecting beams being shown.
The power supply unit in this embodiment is a power supply magnetic ring unit 2, a plurality of magnetic rings are sequentially arranged on the first connecting beam from left to right to form the power supply magnetic ring unit 2, and the power supply magnetic ring unit 2 is arranged at the forefront of the branch switch assembly, so that energy can be conveniently taken. The central control unit 8 is arranged behind the power magnetic ring unit 2, and the central control element is sequentially connected between the first connecting beam and the second connecting beam to form the central control unit 8.
The IGBT valve section 3 in this embodiment is formed by a plurality of IGBTs and a water-cooled radiator by crimping, and the valve section includes a middle frame extending in the left-right direction and two installation end plates fixedly arranged at both ends of the middle frame, and the two installation end plates of the valve section are connected and fixed by four insulating pull rods, and the middle frame is formed by the four insulating pull rods. Be equipped with on two installation end plates and be used for the cooperation to use for the centre gripping location in the left and right sides direction IGBT and water-cooled radiator's clamping device, one of them is for supplying external loading mechanism to exert the dish spring capping device of effort, and another is the rigidity capping device, and the rigidity capping device includes sets up the bulb bolt along the left and right sides direction, can adjust IGBT surface pressure through adjusting the bulb bolt. IGBT and a plurality of water-cooling radiators are clamped between the two mounting end plates, and the water-cooling radiators and the IGBT are arranged at intervals, so that the IGBT can be ensured to be fully radiated through the radiators. The IGBT in the valve section is electrically connected to the corresponding main loop diode, anti-reverse diode, and other elements through the water-cooled heat sink adjacent to and electrically connected to the IGBT. In this embodiment, the two parallel IGBTs constitute the IGBT unit, but of course, in other embodiments, the IGBT unit may be a single IGBT or three or more parallel IGBTs.
The structure of the anti-reverse diode valve section 5 and the structure of the main loop diode valve section 4 are similar to that of the IGBT valve section 3, the difference is only that the elements pressed in the valve section are different, and the IGBT valve section 3 is pressed with an IGBT and a water-cooling radiator; the main loop diode valve section 4 is provided with a main loop diode and a water-cooling radiator in a pressing way; the anti-reverse diode valve section 5 is provided with an anti-reverse diode and a water-cooled radiator in a pressing way. Diode resistors 51 arranged in parallel with the anti-reverse diodes are further arranged between the anti-reverse diode radiators on two sides of any anti-reverse diode in the anti-reverse diode valve section 5, and a 1-driver-2 driving board 31 is further arranged above the IGBT valve section 3. The water-cooled radiator in the IGBT valve section 3 is an IGBT radiator; the water-cooled radiator in the main loop diode valve section 4 is a main loop diode radiator; the water-cooled radiator in the anti-reverse diode valve section 5 is an anti-reverse diode radiator.
The end of branch switch assembly is capacitance module 6, and capacitance module 6 is connected and fixed on third tie-beam 12 and fourth tie-beam 12, because the electric capacity is bulky, sets up capacitance module 6 at branch switch assembly's end and is convenient for install and change. And because the bottom of the capacitor needs to be supported and fixed with the connecting beam 12, the capacitor terminal on the capacitor is arranged towards the front of the branch switch assembly, and the two ends of the capacitor are provided with capacitor resistors 61.
After installing each valve section in subassembly frame 1, need to adopt corresponding electrically conductive connection structure to make between the main circuit diode and between corresponding IGBT unit and the corresponding main circuit diode electrically conduct and be connected, and then form corresponding branch switch circuit, in this embodiment, electrically conductive connection structure includes the female 7 of stromatolite as shown in figure 4, the female 7 of stromatolite has arranged a plurality ofly along controlling the direction in IGBT valve section 3 and main circuit diode valve section 4 below side by side, be equipped with IGBT connecting terminal on every stromatolite female 7 respectively, main circuit diode connecting terminal is used for electrically conductive connection with electrically conductive connecting portion on corresponding main circuit diode valve section 4 and the IGBT valve section 3, in order to realize the electrically conductive connection between corresponding IGBT unit and the corresponding main circuit diode. In this embodiment, the capacitor units are arranged in parallel at two ends of each IGBT unit in a one-to-one correspondence, and therefore, an anti-reverse diode connection terminal and a capacitor connection terminal are further provided on the laminated busbar 7.
Each laminated busbar is used for realizing the conductive connection between the IGBT unit on the IGBT valve section and the corresponding main loop diode on the main loop diode valve section, and actually, the corresponding conductive connection structure for realizing the conductive connection between the main loop diodes and between the corresponding IGBT unit and the corresponding main loop diode not only comprises the laminated busbar, but also comprises the corresponding radiator which is arranged in each valve section and is used for realizing the conductive connection between the adjacent devices such as the IGBT and the main loop diode.
Specifically, in the present embodiment, the laminated busbar 7 is L-shaped as a whole, and includes a horizontal arm portion and a vertical wall portion, wherein the horizontal arm portion is provided with an IGBT connection terminal, a main-circuit diode connection terminal, and an anti-reverse diode connection terminal for electrically connecting with a conductive connection portion of an element on a corresponding valve section, and thus the horizontal arm portion is disposed at the bottom of the branch switch assembly. The vertical wall part extends from the bottom upwards between the capacitor module 6 and the anti-reverse diode valve section 5 and is in conductive connection with the capacitor. In consideration of the convenience of connection, the negative terminal of the laminated busbar 7 is in a terminal hole structure 72, and the positive terminal is in a terminal strip structure, wherein the positive terminals of the IGBT connecting terminal and the main-circuit diode connecting terminal are both in a soft connection structure 71. In other embodiments, the capacitor module may be integrally fixed to the frame formed by the insulating beams, and then the capacitor terminal may be fixed to the assembly frame in a downward direction. Because the mounting beam is of a groove shape, and each valve section is arranged at the top of the mounting beam, a certain mounting space is formed below the mounting beam, and the laminated busbar is convenient to mount.
The flexible connection structure 71 is suitable for crimping a valve section structure, connection redundancy is large, crimping precision of the valve section can be reduced by connecting the valve sections through the flexible connection structure 71, and conductive connection performance is guaranteed. And use the laminated busbar 7 on the branch circuit switch assembly, under meeting the withstand voltage requirement of two-layer female arranging, the clearance of two-layer female arranging of furthest reduction to reduce stray inductance. In other embodiments, the specific structure of the connection terminal is freely designed according to the needs, for example, only the positive terminal in the IGTB connection terminal or only the main-circuit diode connection terminal is designed as a soft connection structure.
According to the branch switch for the direct current breaker, the IGBT valve section 3 and the main loop diode valve section 4 are in conductive connection through the laminated busbar 7, the laminated busbar 7 is arranged below the main loop diode valve section 4 and the IGBT valve section 3, the influence on the installation gap between the main loop diode valve section 4 and the IGBT valve section 3 can be avoided, the installation gap between the two valve sections can be reduced to the greatest extent, and the structure of the whole branch switch assembly is more compact. In addition, during connection, as the lower part is in conductive connection, the installation space is large, the influence of the installation gap between the main loop diode valve section 4 and the IGBT valve section 3 can be avoided in the connection process, and the installation is also convenient. In addition, the branch switch for the direct current circuit breaker adopts a modular design, each element is correspondingly designed into a module and then is integrally installed on the assembly frame 1, and the installation and the connection are simple and orderly, so that errors are not easy to occur. And the capacitor module 6 and the power supply unit are arranged at two sides of the component, and the valve sections which are easy to replace are arranged in the middle, so that all parts of the whole branch switch can be replaced and disassembled conveniently, and the field maintenance is very convenient.
In this embodiment, the whole branch switch assembly corresponds to the circuit structure shown in fig. 6, and the laminated busbars arranged below the IGBT valve section and the main circuit diode valve section are used to realize the conductive connection of devices between the corresponding valve sections. In other embodiments, the way of arranging the laminated busbar below the IGBT valve section and the main circuit diode valve section may also be applied to a branch switch assembly with other circuit topologies, for example, the branch switch assembly is applied to a full-bridge module sequentially connected in series disclosed in the chinese utility model patent with the publication number of CN207304391U, and is not limited to the circuit topology shown in fig. 6.
In this embodiment, corresponding capacitor units are connected in parallel on two sides of the IGBT unit, a capacitor resistor is provided corresponding to a capacitor in the capacitor unit, and an anti-reverse diode resistor is provided corresponding to the anti-reverse diode. Of course, in other embodiments, a bypass switch structure arranged in parallel on both sides of the IGBT unit may be added, and the capacitor unit may also be omitted.
Claims (8)
1. The utility model provides a branch switch subassembly for direct current circuit breaker, includes the subassembly frame, is equipped with on the subassembly frame and arranges in proper order and all follow IGBT valve section and the major loop diode valve section that left right direction extends along the fore-and-aft direction, still is equipped with the power supply unit to the power supply of IGBT valve section on the subassembly frame, major loop diode valve section is including a plurality of major loop diodes of pressure equipment in proper order, and the IGBT valve section is including a plurality of IGBT units of pressure equipment in proper order, between the major loop diode and between corresponding IGBT unit and the corresponding major loop diode through electrically conductive connection structure electrically conductive connection in order to form corresponding branch switch circuit, its characterized in that: the conductive connection structure comprises a plurality of laminated busbars which are arranged below the IGBT valve section and the main circuit diode valve section and are arranged along the left-right direction, corresponding conductive connection parts are respectively arranged at the bottoms of the main circuit diode valve section and the IGBT valve section, which correspond to the laminated busbars, and the laminated busbars are correspondingly and conductively connected with the conductive connection parts on the main circuit diode valve section and the IGBT valve section so as to realize conductive connection between corresponding IGBT units and corresponding main circuit diodes.
2. The branch switch assembly for a dc circuit breaker according to claim 1, wherein: the laminated busbar is provided with an IGBT terminal which is correspondingly and electrically connected with an electrically conductive connecting part on the IGBT valve section and a main loop diode terminal which is correspondingly and electrically connected with an electrically conductive connecting part on the main loop diode valve section, the IGBT terminal and the main loop diode terminal respectively comprise an anode terminal and a cathode terminal, and at least one of the anode terminal and the cathode terminal in the IGBT terminal and/or the main loop diode terminal is of a soft connecting terminal structure.
3. The branch switch assembly for a dc circuit breaker according to claim 2, wherein: the IGBT valve section comprises an IGBT radiator arranged corresponding to an IGBT in an IGBT unit, the main loop diode valve section comprises a main loop diode radiator arranged corresponding to a main loop diode, a conductive connecting part on the main loop diode valve section is arranged on the main loop diode radiator, a conductive connecting part on the IGBT valve section is arranged on the IGBT radiator, an IGBT terminal on the laminated busbar is electrically and fixedly connected with the corresponding IGBT radiator, and a main loop diode terminal on the laminated busbar is electrically and fixedly connected with the corresponding main loop diode radiator.
4. The branch switch assembly for a dc circuit breaker according to claim 2 or 3, wherein: the assembly frame is further provided with capacitor units which are arranged at two ends of each IGBT unit in parallel in a one-to-one correspondence mode through the laminated busbars, each capacitor unit comprises an anti-reverse diode and a capacitor which are sequentially electrically conductive and arranged in series, the anti-reverse diodes of all the capacitor units are sequentially pressed along the left and right directions to form an anti-reverse diode valve section, and the capacitors of all the capacitor units are sequentially arranged along the left and right directions and are fixedly arranged on the assembly frame to form capacitor modules.
5. The branch switch assembly for a dc circuit breaker according to claim 4, wherein: the IGBT valve section, the main loop diode valve section, the anti-reverse diode valve section and the capacitor module are sequentially arranged on the assembly frame along the front-back direction.
6. The branch switch assembly for a dc circuit breaker according to claim 5, wherein: the laminated busbar is provided with an anti-reverse diode terminal which is in corresponding conductive connection with the anti-reverse diode and a capacitor terminal which is in conductive connection with a corresponding capacitor, the laminated busbar is L-shaped and is provided with a transverse arm part and a vertical arm part, the transverse arm part of the laminated busbar is positioned below the anti-reverse diode valve section, the main loop diode valve section and the IGBT valve section, the vertical arm part is positioned between the anti-reverse diode valve section and the capacitor module, the IGBT terminal, the main loop diode terminal and the anti-reverse diode terminal are arranged on the transverse arm part, and the capacitor terminal is arranged on the vertical arm part.
7. The branch switch assembly for a dc circuit breaker according to claim 4, wherein: anti-reverse diode radiators are respectively arranged on the left side and the right side of each anti-reverse diode in the anti-reverse diode valve section, and a diode resistor arranged in parallel with the anti-reverse diodes is arranged between the anti-reverse diode radiators on the two sides of any anti-reverse diode.
8. The branch switch assembly for a dc circuit breaker according to claim 4, wherein: the capacitors are respectively connected with capacitor resistors in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910502543.6A CN112073043B (en) | 2019-06-11 | 2019-06-11 | Branch switch assembly for direct current breaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910502543.6A CN112073043B (en) | 2019-06-11 | 2019-06-11 | Branch switch assembly for direct current breaker |
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| CN112073043A true CN112073043A (en) | 2020-12-11 |
| CN112073043B CN112073043B (en) | 2023-08-15 |
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