Hybrid direct-current switching-on and switching-off equipment

Abstract

The utility model provides a hybrid direct current on-off device. The hybrid direct current on-off device comprises a power electronic module, a mechanical switch, a control system and a clamping structure. The mechanical switch is connected in parallel with the power electronic module; the control system is arranged on the mechanical switch; the clamping structure is used for clamping the power electronic module on the control system; the clamping structure comprises at least one mounting part and at least one clamping part. The mounting part is arranged on the mounting side surface of the first shell; the first shell is a shell of the power electronic module; the clamping part is arranged on the clamping side face of the second shell, the second shell is a shell of the control system, and the clamping side face is used for being attached to the installation side face. According to the scheme of the utility model, only one mechanical switch needs to be designed, and power electronic modules with various voltage grades can be matched through the clamping mechanism, so that the design workload and the product structure complexity are greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to a hybrid direct current breaking device. Background Art

[0002] There are three main types of current interrupting devices (including contactors, circuit breakers, relays, etc.) on the market based on topological structures and interrupting principles: mechanical, solid-state, and hybrid.

[0003] Among them, the mechanical type has low conduction loss, but its switch mechanical and electrical stress is high, and the breaking speed is relatively slow; the solid-state DC circuit breaker has an extremely fast breaking speed, but its conduction loss is large and the heat dissipation system is complex. The hybrid type has mechanical low-loss current carrying, fast insulation recovery ability and solid-state fast breaking ability. Combining the above advantages, hybrid DC breaking equipment has become one of the main development directions in the current market.

[0004] The topological structure of hybrid DC breaking equipment is mainly composed of main current branch, transfer branch and energy absorption branch. Among them, the main current branch generally includes fast mechanical switch; the transfer branch includes power electronic switch and auxiliary transfer circuit; the energy absorption branch is generally lightning arrester, etc.

[0005] However, hybrid DC disconnect devices contain both mechanical switches and power electronic switches and energy absorption branches, and their structures and control logic are relatively complex, and their costs are also relatively high. In addition, from the application perspective, power electronic switches in different applications often have different voltage levels, such as 220V, 380V, 680V, ​​1000V, 1500V, etc. For different power electronic components, higher voltage levels require higher specifications of power electronic components, and the higher the specifications, the larger the size and the higher the price.

[0006] Therefore, how to provide a hybrid DC breaking device to solve the defects of the existing hybrid DC breaking device that it cannot be used for power electronic switches of different voltage levels and has a relatively complex structure and high cost has become a technical problem that needs to be urgently solved by technical personnel in this field. Utility Model Content

[0007] The purpose of the utility model is to provide a hybrid DC breaking device, which only needs to design a mechanical switch, and can be matched with power electronic modules of various voltage levels through a snap-fit ​​mechanism, greatly reducing the design workload and product structure complexity.

[0008] On one hand, the utility model provides a hybrid DC disconnect device, which includes: a power electronic module, a mechanical switch, a control system and a snap-fit ​​structure. The mechanical switch is connected in parallel with the power electronic module; the control system is arranged on the mechanical switch; the snap-fit ​​structure is used to snap the power electronic module onto the control system; wherein the snap-fit ​​structure includes: at least one mounting portion and at least one snap-fit ​​portion. The mounting portion is arranged on the mounting side of the first shell; the first shell is the shell of the power electronic module; the snap-fit ​​portion is arranged on the snap-fit ​​side of the second shell, the second shell is the shell of the control system, and the snap-fit ​​side is used to fit with the mounting side.

[0009] In another exemplary embodiment of the present invention, the mounting portion is a protrusion, and the protrusion extends toward the engaging side surface. The protrusion can better achieve the engaging effect and stability.

[0010] In another exemplary embodiment of the present invention, the engaging portion is a engaging groove, and the engaging groove and the protrusion are adapted in shape and profile. The engaging groove can satisfy a certain limiting function to ensure the stability of the structure.

[0011] In another exemplary embodiment of the present invention, the shape of the engaging groove is a right-angled trapezoid or a right-angled triangle, and a baffle is provided at the hypotenuse of the engaging groove, and the baffle extends toward the inside of the engaging groove. The engaging groove of this structure is easy to realize.

[0012] In another exemplary embodiment of the present invention, the top length of the engaging groove is greater than or equal to the top length of the protrusion. This design allows the protrusion to slide smoothly into the engaging groove.

[0013] In another exemplary embodiment of the present invention, the protrusion is provided with a groove at the inclined surface to cooperate with the baffle. The cooperation between the baffle and the groove can prevent the power electronic module from falling.

[0014] In another exemplary embodiment of the present invention, the engaging side surface is further provided with a mounting hole for accommodating a signal input and output interface of the control system.

[0015] In another exemplary embodiment of the present invention, the installation side is further provided with a receiving cavity for receiving the connection terminal led out from the inside of the power electronic module. This structure can realize modular electrical connection.

[0016] In another exemplary embodiment of the utility model, a power electronic switch and an energy absorption branch connected in parallel therewith constitute the power electronic module, the power electronic switch and the energy absorption branch are arranged inside the first housing, and the power electronic switch is a power electronic switch of different voltage levels. This structure can modularize the power electronic switch and the energy absorption branch in the hybrid DC breaking device, and the structure is simple.

[0017] In another exemplary embodiment of the present invention, the mechanical switch is further provided with two connection points so as to be connected in parallel with the power electronic switch. This structure can realize the transfer of current. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following drawings are only used to illustrate and explain the present invention, and do not limit the scope of the present invention.

[0019] Figure 1A This is a schematic diagram of an exemplary structure of the hybrid DC breaking device of the utility model.

[0020] Figure 1B This is another exemplary structural schematic diagram of the hybrid DC breaking device of the utility model.

[0021] Figure 2 The utility model is a circuit diagram of a power electronic module and a mechanical switch in a hybrid DC breaking device.

[0022] The reference numerals are as follows:

[0023] 1 Hybrid DC switching equipment

[0024] 10 Power Electronics Module

[0025] 11 Mechanical switch

[0026] 12 Control System

[0027] 13. Snap mechanism

[0028] 101 First Shell

[0029] 102 Power Electronic Switches

[0030] 103 Energy absorption branch

[0031] 111 Connection Points

[0032] 121 Second Shell

[0033] 131 Installation

[0034] 132 snap-fit ​​part

[0035] 101A Installation side

[0036] 121A Snap-on side

[0037] 1321 Baffle

[0038] 121A1 Mounting holes

[0039] 101A1 Accommodation chamber DETAILED DESCRIPTION

[0040] In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation methods of the utility model are now described with reference to the accompanying drawings. The same reference numerals in the drawings represent components with the same structure or similar structures but the same functions.

[0041] In this document, “exemplary” means “serving as an example, instance or illustration”, and any diagram or implementation described in this document as “exemplary” should not be interpreted as a more preferred or more advantageous technical solution.

[0042] In order to simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked.

[0043] In this article, "a" or "an" not only means "only one", but also means "more than one". In this article, "first", "second", etc. are only used to distinguish each other, rather than to indicate their importance and order.

[0044] In order to solve the defects of the existing hybrid DC breaking device that cannot be applied to power electronic switches of different voltage levels, and has a relatively complex structure and high cost, the present application proposes a hybrid DC breaking device. Figure 1A and Figure 1B The hybrid DC switching device 1 shown includes a power electronic module 10 , a mechanical switch 11 , a control system 12 and a locking mechanism 13 .

[0045] In order to make the power electronic switches and energy absorption branches in the hybrid DC interrupter modular and simple in structure, such as Figure 2 As shown, the power electronic switch 102 and the energy absorption branch 103 connected in parallel therewith constitute the power electronic module 10. Figure 1A and Figure 1B As shown, the power electronic switch 102 and the energy absorption branch 103 are arranged inside the first housing 101. Therefore, the various power electronic modules of the hybrid DC breaking device provided in this embodiment can all use a common mechanical switch 11 and control system 12.

[0046] In this embodiment, the power electronic switch 102 is a power electronic switch of different voltage levels (including 220V, 380V, 680V, ​​1000V, 1500V, etc.), for example, Figure 1A The power electronic switch shown is a 600V power electronic switch. Figure 1B The power electronic switch shown is a 1500V power electronic switch.

[0047] In this embodiment, when a fault occurs in the control system, the mechanical switch 11 is first opened. When the contact opening distance of the mechanical switch 11 reaches a certain distance, the power electronic switch 102 in the transfer branch is turned on. Since the impedance of the mechanical switch 11 is greater than that of the transfer branch at this time, the fault current is naturally transferred from the mechanical switch 11 of the main current branch to the transfer branch. Thereafter, after the contact gap of the mechanical switch 11 can withstand the transient recovery voltage of the system, the power electronic switch 102 in the transfer branch is turned off, and the fault current is transferred to the energy absorption branch 103, and the fault energy is absorbed by the metal oxide varistor. In this embodiment, the mechanical switch 11 is connected in parallel with the power electronic module 10, and the mechanical switch 11 is used to perform the disconnection or connection of the hybrid DC breaking device.

[0048] In practical applications, the power electronic switch includes an IGBT.

[0049] In this embodiment, the control system 12 is disposed on the mechanical switch 11 so as to control the mechanical switch 11 and the power electronic module 10 .

[0050] In this embodiment, in order to realize the current transfer, the mechanical switch 11 is further provided with two connection points 111 so as to be connected in parallel with the power electronic switch 102 .

[0051] In order to make the power electronic switches of different voltage levels in the hybrid DC breaking device use a common mechanical switch and control system, in this embodiment, the power electronic module 10 is clamped on the control system 12 through a clamping structure 13 .

[0052] Specific reference Figure 1A The clamping structure 13 includes at least one mounting portion 131 and at least one clamping portion 132. The clamping portion 132 and the mounting portion 131 are clamped in a one-to-one correspondence.

[0053] The mounting portion 131 is disposed on the mounting side surface 101A of the first housing 101. The first housing 101 is a housing of the power electronic module 10. In this embodiment, since the power electronic modules 10 are disposed in pairs on the control system 12, the mounting portions 131 are disposed on both mounting side surfaces 101A of the first housing 101.

[0054] The engaging portion 132 is disposed on the engaging side surface 121A of the second shell 121 . The second shell 121 is a shell of the control system 12 . The engaging side surface 121A is used to fit with the installation side surface 101A of the power electronic module 10 .

[0055] In order to better achieve the engagement effect and stability, as an optional embodiment, the mounting portion 131 is a protrusion, and the protrusion extends toward the engagement side surface 121A.

[0056] In order to satisfy a certain limiting function and ensure the stability of the structure, and therefore to achieve a better limiting effect, as an optional embodiment, the engaging portion 132 is a engaging groove, and the shape and contour of the engaging groove and the protrusion are adapted.

[0057] In order to make the engagement groove easy to realize, as an optional embodiment, the engagement groove is in the shape of a right-angled trapezoid or a right-angled triangle. During the engagement process, the groove wall of the engagement groove perpendicular to the notch has the function of guiding the protrusion to be inserted.

[0058] The engaging slot is provided with a baffle 1321 at the oblique side thereof, and the baffle 1321 extends toward the inside of the engaging slot.

[0059] In order to prevent the power electronic module from falling, the protrusion is provided with a groove at the inclined surface to cooperate with the baffle 1321. During the engagement process, the baffle 1321 is inserted into the groove to achieve further engagement of the mounting portion 131 and the engagement portion 132.

[0060] In order to make the protrusion slide smoothly into the engaging groove, in this embodiment, the top length of the engaging groove is greater than or equal to the top length of the protrusion.

[0061] In order to realize modular electrical connection, the engaging side surface 121A is further provided with a mounting hole 121A1 for accommodating the signal input and output interface of the control system 12 .

[0062] like Figure 1A and Figure 1B As shown, the mounting side 101A is further provided with a receiving cavity 101A1 for receiving the wiring terminals led out from the inside of the power electronic module 10, for example, the wiring terminals led out from the gate and emitter of the IGBT in the power electronic module 10 and the wiring terminals led out from the inductor in the power electronic module 10.

[0063] Specifically, the terminals drawn from the gate and emitter of the IGBT in the power electronic module 10 are connected to the signal input interface of the control system 12. The terminals drawn from the gate and emitter of the IGBT in the power electronic module 10 are connected to the signal output interface of the control system 12.

[0064] In summary, the above solution of the present application has the following beneficial effects:

[0065] First, from the perspective of product design, the mechanical switch of the present application can achieve downward compatibility, that is, high voltage can be used for low voltage. During the design stage, only one mechanical switch needs to be designed, and it can be used with power electronic modules of various voltage levels through the snap-fit ​​mechanism, which greatly reduces the design workload and product structure complexity.

[0066] Second, from a production perspective, the present application uses a mechanical switch that is applicable to multiple models, which greatly reduces the complexity of production. For example, the types of materials can be reduced, production line investment can be reduced, logistics costs are greatly reduced, and production mixing is less likely to occur, thereby improving product quality.

[0067] Third, from an investment perspective, a mechanical switch is a complex mechanism. The present application uses a mechanical switch applicable to various types of power electronic modules, thereby greatly reducing investment.

[0068] Fourth, from the customer's perspective, if the customer needs to upgrade the power grid during use, they only need to replace the power electronic module to achieve a rapid upgrade without the need for secondary investment, which greatly improves customer satisfaction.

[0069] Fifth, from the perspective of product maintenance, if a power electronic module fails, it can be solved by simply replacing the power electronic module, thereby achieving a quick solution to the failure. Therefore, the utility model effectively overcomes various shortcomings of the prior art and has a high industrial utilization value.

[0070] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0071] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the utility model, and they are not used to limit the protection scope of the utility model. Any equivalent implementation scheme or changes that do not deviate from the technical spirit of the utility model, such as the combination, division or repetition of features, should be included in the protection scope of the utility model. The nouns and pronouns about people in this patent application are not limited to specific genders.

Claims

1. Hybrid DC breaking device, characterized in that: include: a power electronics module (10), a mechanical switch (11) connected in parallel with the power electronic module (10); a control system (12) disposed on the mechanical switch (11); and A snap-fit ​​structure (13) for snapping the power electronic module (10) onto the control system (12); Wherein, the engaging structure (13) comprises: at least one mounting portion (131) disposed on a mounting side surface (101A) of a first housing (101); the first housing (101) being a housing of the power electronic module (10); and At least one engaging portion (132) is engaged with the mounting portion (131) in a one-to-one corresponding manner, and the engaging portion (132) is arranged on the engaging side surface (121A) of the second shell (121), the second shell (121) is the shell of the control system (12), and the engaging side surface (121A) is used to fit with the mounting side surface (101A).

2. The hybrid DC breaking device according to claim 1, characterized in that: The mounting portion (131) is a protrusion, and the protrusion extends toward the engaging side surface (121A).

3. The hybrid DC breaking device according to claim 2, characterized in that: The engaging portion (132) is a engaging groove, and the shapes and contours of the engaging groove and the protrusion are matched.

4. The hybrid DC breaking device according to claim 3, characterized in that: The shape of the engaging groove is a right-angled trapezoid or a right-angled triangle. A baffle (1321) is provided at the hypotenuse of the engaging groove, and the baffle (1321) extends toward the inside of the engaging groove.

5. The hybrid DC breaking device according to claim 4, characterized in that: The top length of the engaging groove is greater than or equal to the top length of the protrusion.

6. The hybrid DC breaking device according to claim 4, characterized in that: The protrusion is provided with a groove at the inclined surface to cooperate with the baffle (1321).

7. The hybrid DC breaking device according to claim 6, characterized in that: The engaging side surface (121A) is also provided with a mounting hole (121A1) for accommodating a signal input and output interface of the control system (12).

8. The hybrid DC breaking device according to claim 7, characterized in that: The installation side (101A) is also provided with a receiving cavity (101A1) for receiving a connection terminal led out from the inside of the power electronic module (10).

9. The hybrid DC breaking device according to claim 8, characterized in that: A power electronic switch (102) and an energy absorption branch (103) connected in parallel therewith constitute the power electronic module (10); the power electronic switch (102) and the energy absorption branch (103) are arranged inside the first housing (101); and the power electronic switch (102) is a power electronic switch of different voltage levels.

10. The hybrid DC breaking device according to claim 9, characterized in that: The mechanical switch (11) is also provided with two connection points (111) so as to be connected in parallel with the power electronic switch (102).

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