Circuit breaker module and electrical cabinet
By isolating the input electrodes of each circuit breaker in the circuit breaker module and connecting them externally, the problem of current imbalance when circuit breakers are connected in parallel is solved, thereby improving the operational reliability and service life of the circuit breakers.
Patent Information
- Application Number
- CN202520379663.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-04
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2035-03-04
AI Technical Summary
In high-power electrical cabinets, impedance differences exist when circuit breakers are connected in parallel, leading to current imbalance, which affects the reliability and service life of the circuit breakers.
By isolating the input electrodes of each circuit breaker in the circuit breaker module and connecting them outside the module, current balancing is achieved through conductor connection.
This reduces the current difference between circuit breakers, improving the operational reliability and service life of circuit breaker modules and electrical cabinets.
Smart Images
Figure CN223858111U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of power equipment especially relates to a circuit breaker module and electrical cabinet. BACKGROUND
[0002] In recent years, with the rapid development of new energy, the trend of new energy (such as wind turbine generator) to high-power unit is more and more obvious, in the design of high-power electrical cabinet, due to the large current flowing through the circuit breaker, in order to meet the capacity demand, two or more circuit breakers are often used in parallel, this parallel use mode is usually to directly parallel the output electrode and the input electrode of the circuit breaker respectively, and is arranged in the electrical cabinet. However, it is found in actual application that, due to the difference in impedance between the parallel circuit breakers, the current flowing through the two directly parallel circuit breakers often has great difference, resulting in that the current of a certain circuit breaker in parallel is too large to meet the derating requirement, and long-term use affects the service life. Therefore, improving the current sharing level of the circuit breaker in the high-power electrical cabinet has important significance for improving the working reliability and service life of the circuit breaker. SUMMARY
[0003] In order to overcome the defects of large current difference of the existing circuit breaker module, affecting the working reliability and service life, the utility model provides a circuit breaker module and electrical cabinet to solve the above technical problems.
[0004] The utility model discloses a purpose is realized through the following technical scheme:
[0005] First, a circuit breaker module is provided, including fixed support and circuit breaker, the circuit breaker is connected on the fixed support, the number of circuit breaker is greater than or equal to 2, the output electrode of each circuit breaker is connected with the conductor, and the input electrode of each circuit breaker is insulated from each other.
[0006] Among them, in the output end of the circuit breaker module, the output electrode of each circuit breaker is connected with the conductor, and in the input end of the circuit breaker module, the input electrode of each circuit breaker is insulated from each other.
[0007] Further, the circuit breaker includes a first circuit breaker and a second circuit breaker, the conductor includes a first conductor and a second conductor, the first conductor is fixedly connected with the output electrode of the first circuit breaker, and the second conductor is fixedly connected with the output electrode of the second circuit breaker.
[0008] Among them, the input electrode of the first circuit breaker and the second circuit breaker is insulated from each other.
[0009] Further, the conductive body further comprises a third conductive body and a fourth conductive body, the third conductive body is connected with the input electrode of the first circuit breaker, and the fourth conductive body is connected with the input electrode of the second circuit breaker.
[0010] Further, the circuit breaker module further comprises a first contactor and a second contactor, the first contactor is connected with the third conductive body, and the second contactor is connected with the fourth conductive body.
[0011] The input electrode of the first circuit breaker is connected with the first contactor through the third conductive body, and the input electrode of the second circuit breaker is connected with the second contactor through the fourth conductive body.
[0012] Further, the conductive body further comprises a fifth conductive body and a sixth conductive body, the fifth conductive body is connected with the first contactor, and the sixth conductive body is connected with the second contactor, and the fifth conductive body and the sixth conductive body are insulated from each other.
[0013] Further, the conductive body further comprises a seventh conductive body and an eighth conductive body, the seventh conductive body is connected with the first conductive body, and the eighth conductive body is connected with the second conductive body, and the seventh conductive body and the eighth conductive body are connected in parallel in correspondence.
[0014] Further, the circuit breaker is a three-phase circuit breaker or a four-phase circuit breaker.
[0015] Further, the conductive body is one of a copper bar, a copper-clad aluminum bar and an aluminum bar.
[0016] In the second aspect, the circuit breaker module is provided.
[0017] Further, the electrical cabinet further comprises a cabinet body and a contactor module, the cabinet body is provided with a support, and the contactor module and the circuit breaker module are connected to the support.
[0018] The circuit breaker module and the electrical cabinet have the beneficial effects compared with the prior art.
[0019] Since the input electrodes of the circuit breakers in the circuit breaker module are insulated from each other, the bus bars of the input electrodes can be connected outside the circuit breaker module, the impedance difference of the circuit breaker branches in the circuit breaker module is compared, and the ratio is greatly reduced, so that the current difference of the circuit breakers is reduced, the current sharing effect of the circuit breaker module is further improved, and the working reliability and service life of the circuit breaker module and the electrical cabinet using the circuit breaker module are improved. BRIEF DESCRIPTION OF DRAWINGS
[0020] In order to more clearly illustrate the technical solutions of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings described in the following embodiment are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.
[0021] Figure 1 It is a perspective view of the circuit breaker module of the present application embodiment.
[0022] Figure 2 It is a perspective view of the electrical cabinet of the present application embodiment.
[0023] Figure 3 It is an electrical connection principle diagram of the circuit breaker module and the wind driven generator of the present application embodiment.
[0024] Explanation of the signs in the figure:
[0025] 1-fixed support; 2-first circuit breaker; 3-second circuit breaker; 4-first conductor; 5-second conductor; 6-third conductor; 7-fourth conductor; 8-first contactor; 9-second contactor; 10-fifth conductor; 11-sixth conductor; 12-seventh conductor; 13-eighth conductor; 100-cabinet body; 200-circuit breaker module; 300-contactor module; A-first power grid parallel end; B-second power grid parallel end; C-third power grid parallel end; A1-first cabinet wiring terminal; B1-second cabinet wiring terminal; C1-third cabinet wiring terminal; E-first generator stator parallel end; F-second generator stator parallel end; G-third generator stator parallel end; Z1-equivalent impedance of the first circuit breaker; Z2-equivalent impedance of the second circuit breaker; Z3-equivalent impedance of the branch cable to the generator stator where the first circuit breaker is located; Z4-equivalent impedance of the branch cable to the generator stator where the second circuit breaker is located. DETAILED DESCRIPTION
[0026] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0027] It should be understood that when used in the specification and the appended claims, the terms "comprise" and "include" indicate the presence of the described features, integers, steps, operations, elements, and / or components, but do not exclude one or more other features, integers, steps, operations, elements, components, and / or groups thereof.
[0028] It should also be understood that the terms used herein in this utility specification are for the purpose of describing particular embodiments and are not intended to limit the utility. As used in this utility specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
[0029] It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, indicate an orientation or position shown by the drawings, or an orientation or position commonly placed when the product of the application is used, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.
[0030] In the description of the application, it should also be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.
[0031] Embodiment
[0032] Please refer to Figure 1 The circuit breaker module 200 shown in the figure includes a fixed support 1 and a circuit breaker, the circuit breaker is connected to the fixed support 1, the number of the circuit breaker is greater than or equal to 2, and the output electrode of each circuit breaker is connected with a conductor, and the input electrode of each circuit breaker is insulated from each other. In this embodiment, the output electrode of each circuit breaker is connected with a conductor at the output end of the circuit breaker module 200, and the input electrode of each circuit breaker is insulated from each other at the input end of the circuit breaker module 200. In this embodiment, the fixed support 1 is an insulator, and the conductor is a copper bar.
[0033] The circuit breaker includes a first circuit breaker 2 and a second circuit breaker 3, and the conductor includes a first conductor 4 and a second conductor 5, the first conductor 4 is fixedly connected with the output electrode of the first circuit breaker 2, and the second conductor 5 is fixedly connected with the output electrode of the second circuit breaker 3. In this embodiment, the first circuit breaker 2 and the second circuit breaker 3 are three-phase circuit breakers. Among them, the input electrodes of the first circuit breaker 2 and the second circuit breaker 3 are insulated from each other.
[0034] The conductive body further comprises a third conductive body 6 and a fourth conductive body 7, the third conductive body 6 is connected with the input electrode of the first circuit breaker 2, and the fourth conductive body 7 is connected with the input electrode of the second circuit breaker 3. The circuit breaker module 200 further comprises a first contactor 8 and a second contactor 9, the first contactor 8 is connected with the third conductive body 6, and the second contactor 9 is connected with the fourth conductive body 7. The conductive body further comprises a fifth conductive body 10 and a sixth conductive body 11, the fifth conductive body 10 is connected with the first contactor 8, and the sixth conductive body 11 is connected with the second contactor 9, and the fifth conductive body 10 and the sixth conductive body 11 are insulated from each other.
[0035] At the input end of the circuit breaker module 200, the input electrode of the first circuit breaker 2 is connected with the first contactor 8 through the third conductive body 6, and the input electrode of the second circuit breaker 3 is connected with the second contactor 9 through the fourth conductive body 7. The first contactor 8 is connected with the fifth conductive body 10, and the second contactor 9 is connected with the sixth conductive body 11. At the input end of the circuit breaker module 200, the input electrode of the first circuit breaker 2 and the input electrode of the second circuit breaker 3 are insulated from each other, that is, the fifth conductive body 10 and the sixth conductive body 11 are insulated from each other.
[0036] The conductive body further comprises a seventh conductive body 12 and an eighth conductive body 13, the seventh conductive body 12 is connected with the first conductive body 4, and the eighth conductive body 13 is connected with the second conductive body 5, and the seventh conductive body 12 and the eighth conductive body 13 are connected in parallel. The output electrode of the first circuit breaker 2 is connected with the seventh conductive body 12 through the first conductive body 4, and the output electrode of the second circuit breaker 3 is connected with the eighth conductive body 13 through the second conductive body 5.
[0037] Referring to Figure 2 The electrical cabinet shown comprises Figure 1 The circuit breaker module 200 further comprises a cabinet body 100 and a contactor module 300, the cabinet body 100 is provided with a support, and the contactor module 300 and the circuit breaker module 200 are connected on the support. The input end of the circuit breaker module 200 is connected with the contactor module 300, that is, the input electrode of the first circuit breaker 2 and the input electrode of the second circuit breaker 3 are connected with the contactor module 300, and the input end of each circuit breaker in the circuit breaker module 200 is insulated. The output end of the circuit breaker module 200, that is, the output electrode of the first circuit breaker 2 and the output electrode of the second circuit breaker 3 are connected to the outside through a cable.
[0038] Referring to Figure 3The circuit breaker module is shown in the electrical connection principle diagram of the wind driven generator. The circuit breaker module 200 is applied in the wind driven generator system. The cabinet 100 is a grid-connected cabinet of a converter in the wind driven generator system. The cabinet 100 comprises a first grid parallel end A, a second grid parallel end B and a third grid parallel end C which are parallel to each other. The first grid parallel end A is connected with the circuit breaker module 200 through a first cabinet terminal A1, the second grid parallel end B is connected with the circuit breaker module 200 through a second cabinet terminal B1, and the third grid parallel end C is connected with the circuit breaker module 200 through a third cabinet terminal C1. The output terminals of the circuit breaker module 200 are correspondingly parallel, the input terminals are insulated from each other and are connected with the contactors in the contactor module 300 respectively, and finally the parallel connection is combined at the far end of the grid-connected cabinet through a cable and is connected with the stator of the wind driven generator (i.e. a first generator stator parallel end E, a second generator stator parallel end F and a third generator stator parallel end G which are parallel to each other).
[0039] The circuit breaker itself has certain impedance, for example, Figure 3 The equivalent impedance Z1 of the first circuit breaker and the equivalent impedance Z2 of the second circuit breaker are different due to the difference between the circuit breakers themselves, even if the circuit breakers are of the same specification and model.
[0040] If the parallel connection mode of the prior art circuit breaker is adopted, i.e. the input terminals of the multiple circuit breakers are directly connected in parallel and the output terminals are directly connected in parallel, the current ratio of the parallel connection circuit breakers is Z1 / Z2, and due to the difference between Z1 and Z2, the current flowing between the parallel connection circuit breakers is greatly different, which affects the working reliability and service life of the circuit breakers.
[0041] The parallel connection mode of the circuit breaker module 200 of the utility model is adopted, and Figure 3 It can be seen that the equivalent impedance Z3 of the cable from the first circuit breaker to the generator stator and the equivalent impedance Z4 of the cable from the second circuit breaker to the generator stator are much greater than Z1 and Z2, and the current ratio between the parallel connection circuit breakers is (Z1+Z3) / (Z2+Z4). Therefore, the current balance effect between the circuit breakers is more excellent.
[0042] In other embodiments, the number of circuit breakers of the circuit breaker module can be set to three, four or more according to requirements, and the principle of the electrode connection of the circuit breakers is that the output electrodes can be correspondingly connected in parallel and the input electrodes need to be insulated from each other.
[0043] The above merely describes a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present application, and these modifications or replacements should be encompassed within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims
1. A circuit breaker module characterized by, The circuit breaker module comprises a fixed support and circuit breakers, the circuit breakers are connected to the fixed support, the number of the circuit breakers is greater than or equal to 2, the output electrode of each circuit breaker is connected with a conductor, and the input electrodes of each circuit breaker are insulated from each other.
2. The circuit breaker module of claim 1, wherein, The circuit breaker comprises a first circuit breaker and a second circuit breaker, and the conductor comprises a first conductor and a second conductor, the first conductor is fixedly connected with the output electrode of the first circuit breaker, and the second conductor is fixedly connected with the output electrode of the second circuit breaker.
3. The circuit breaker module of claim 2, wherein, The conductor further comprises a third conductor and a fourth conductor, the third conductor is connected with the input electrode of the first circuit breaker, and the fourth conductor is connected with the input electrode of the second circuit breaker.
4. The circuit breaker module of claim 3, wherein, The circuit breaker module further comprises a first contactor and a second contactor, the first contactor is connected with the third conductor, and the second contactor is connected with the fourth conductor.
5. The circuit breaker module of claim 4, wherein, The conductor further comprises a fifth conductor and a sixth conductor, the fifth conductor is connected with the first contactor, the sixth conductor is connected with the second contactor, and the fifth conductor and the sixth conductor are insulated from each other.
6. The circuit breaker module of claim 5, wherein, The conductor further comprises a seventh conductor and an eighth conductor, the seventh conductor is connected with the first conductor, the eighth conductor is connected with the second conductor, and the seventh conductor and the eighth conductor are connected in parallel in correspondence.
7. The circuit breaker module of claim 1, wherein, The circuit breaker is a three-phase circuit breaker or a four-phase circuit breaker.
8. The circuit breaker module of claim 1, wherein, The conductor is one of a copper bar, a copper-clad aluminum bar and an aluminum bar.
9. An electrical cabinet, characterized in that The circuit breaker module comprises the circuit breaker module as claimed in any one of claims 1-8.
10. The electrical cabinet of claim 9, wherein, The circuit breaker module further comprises a cabinet and a contactor module, the cabinet is provided with a support, and the contactor module and the circuit breaker module are connected to the support.