An interphase insulation isolation structure of a frame circuit breaker

Abstract

The utility model relates to a kind of phase-to-phase insulation isolation structure of frame circuit breaker, by additionally installing strip and insulating plate, direct compatibility to existing standard switch body is realized, which makes the existing product series without redesign or change switch body, it can satisfy higher voltage grade (such as 800V / 1140V) insulation requirement, saves design and production cost, by setting the installation strip with insulating spacer on drawer seat, when switch body is shaken into to connecting position, insulating spacer can be accurately inserted and isolated corresponding through insulation channel, form reliable physical insulation barrier, the structure fundamentally eliminates the risk of phase-to-phase breakdown under high voltage working condition, significantly improves the safety guarantee of equipment and personnel.

Description

Technical Field

[0001] This utility model relates to the field of frame circuit breaker technology, and in particular to a phase-to-phase insulation isolation structure for a frame circuit breaker. Background Technology

[0002] As a key protective component in low-voltage power distribution systems, the phase-to-phase insulation performance of frame circuit breakers directly affects the safety of equipment and personnel. With industrial development, the demand for circuit breakers at higher voltage levels (such as 800V and 1140V) is increasing. However, when the switch body and drawer base of existing standard frame circuit breakers are assembled, although there is a gap between the phase busbars erected on the base plate, the air dielectric strength of this gap may be insufficient under high-voltage conditions, posing a risk of phase-to-phase breakdown.

[0003] Currently, in order to improve insulation capabilities, the common practice is to redesign the switch body itself, such as increasing the spacing between phase busbars or adding insulation components. However, this approach results in the product being incompatible with existing standard structures, requiring the development of new molds and production processes, which leads to huge design and production costs and makes it difficult to upgrade existing product series. In addition, under dynamic operating conditions, especially when subjected to short-circuit electrodynamic forces, the connection stability of the output busbar is also tested, and poor contact may occur due to vibration displacement, leading to overheating faults. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a frame circuit breaker phase-to-phase insulation isolation structure that is simple in structure, highly compatible, safe and reliable, and can effectively improve the phase-to-phase insulation performance.

[0005] To achieve the above objectives, this utility model employs a phase-to-phase insulation isolation structure for a frame circuit breaker, including a drawer base and a switch body removably disposed within the drawer base. At least two rows of phase-to-phase busbars are erected on the base plate of the switch body, with gaps between adjacent phase-to-phase busbars within the same row. The gaps between the at least two rows of phase-to-phase busbars are aligned horizontally to form at least one longitudinal through-insulation channel. The drawer base is provided with a phase-to-phase insulation isolation structure corresponding to the through-insulation channel. The phase-to-phase insulation isolation structure includes an insulating plate and a mounting strip. The insulating plate is fixedly mounted on the drawer base. On the inner bottom plate of the drawer seat, the insulating plate and the inner bottom plate of the drawer seat are respectively provided with plug-in holes for the phase busbars to pass through. The number of mounting strips is the same as the number of through insulation channels, and they are spaced above the insulating plate and connected to the inner bottom plate of the drawer seat. At least two insulating spacers are provided on the mounting strips. When the switch body and the drawer seat are connected, the bottom of the phase busbar passes through the plug-in holes of the insulating plate and the inner bottom plate of the drawer seat in sequence and is electrically connected to the output busbar provided at the bottom of the drawer seat. The insulating spacers on the mounting strips all extend into and isolate the corresponding through insulation channels.

[0006] The beneficial effects of the above structure are as follows: by adding mounting strips and insulating plates, direct compatibility with existing standard switch bodies is achieved. This allows existing product series to meet the insulation requirements of higher voltage levels (such as 800V / 1140V) without redesigning or modifying the switch body, saving design and production costs. By setting mounting strips with insulating spacers on the drawer base, when the switch body is swung into the connection position, the insulating spacers can accurately insert and isolate the corresponding through insulation channels, forming a reliable physical insulation barrier. This structure fundamentally eliminates the risk of phase-to-phase breakdown under high voltage conditions, significantly improving the safety of equipment and personnel.

[0007] This utility model is further configured such that the mounting strip and the insulating spacer are integrally injection molded from insulating material. Integral injection molding of the insulating material eliminates connection gaps and assembly interfaces, resulting in a component with high mechanical strength and good overall integrity. This structure is not easily loosened, deformed, or damaged under frequent insertion / removal and vibration environments, ensuring long-term stability of insulation performance.

[0008] This utility model is further configured such that the position of the output busbar corresponds to the end position of the phase-to-phase busbar on the switch body, and the number of output buses is consistent with the number of phase-to-phase busbars. By setting the number and position of the output buses to correspond one-to-one with the phase-to-phase busbars of the switch body, an independent and complete conductive path is constructed for each phase current, ensuring the balance of current distribution and avoiding phase-to-phase interference.

[0009] This utility model is further configured with angle brackets on both sides of the output busbar, which are then securely connected to the bottom plate of the drawer seat via these angle brackets. By providing angle brackets on both sides of the output busbar and securing it to the bottom plate of the drawer seat, a robust mechanical fixation is achieved. This structure effectively resists vibrations and displacements caused by the enormous electrodynamic forces generated, especially by short-circuit currents, ensuring the continuous stability and reliability of the electrical connection between the output busbar and the phase-to-phase busbar, and preventing overheating faults due to poor contact. Attached Figure Description

[0010] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0011] Figure 2 This is a schematic diagram of the base plate structure of the switch body according to an embodiment of the present invention.

[0012] Figure 3 This is a schematic diagram of the phase-to-phase insulation isolation structure of the drawer seat according to an embodiment of the present utility model.

[0013] Figure 4 This is an assembly diagram of the drawer seat and the alternating busbars according to an embodiment of the present utility model.

[0014] Figure 5 This is a cross-sectional view of the assembly of the insulating spacer and the through insulating channel of the mounting strip according to an embodiment of the present invention.

[0015] Figure 6 This is a schematic diagram of the output busbar structure of the drawer seat according to an embodiment of the present utility model.

[0016] Figure 7 This is a schematic diagram of the corresponding structure of the phase busbar and the output busbar in an embodiment of this utility model. Detailed Implementation

[0017] like Figures 1-7 As shown, an embodiment of this utility model provides a phase-to-phase insulation isolation structure for a frame circuit breaker, including a drawer base 1 and a switch body 2 that is removably disposed in the drawer base 1. Two rows of phase-to-phase busbars 3 are erected on the bottom plate of the switch body 2, and each row of phase-to-phase busbars 3 has three. Therefore, there are two gaps between adjacent phase-to-phase busbars 3 in the same row. The gaps of the front row of phase-to-phase busbars 3 and the gaps of the rear row of phase-to-phase busbars 3 are aligned one by one in the horizontal direction, thereby forming two longitudinal through insulation channels 31.

[0018] The drawer seat 1 is provided with an interphase insulation isolation structure 4 corresponding to the two through insulation channels 31. The interphase insulation isolation structure 4 includes an insulating plate 41 and mounting strips 42. The insulating plate 41 is fixedly installed on the inner bottom plate of the drawer seat 1, and the insulating plate 41 and the inner bottom plate of the drawer seat 1 are respectively provided with plug holes for the interphase busbar 3 to pass through (not shown in the figure). The number of mounting strips 42 is the same as the number of through insulation channels 42, and they are spaced above the insulating plate 41 and connected to the inner bottom plate of the drawer seat 1. Two insulating spacers 421 are provided on the mounting strips 42, and the mounting strips 42 and the insulating spacers 421 are integrally injection molded with insulating material. When the switch body 2 and the drawer seat 1 are in the connected state, the bottom of the interphase busbar 3 passes through the plug holes of the insulating plate 41 and the inner bottom plate of the drawer seat 1 in sequence and is electrically connected to the output busbar 5 provided at the bottom of the drawer seat 1. At the same time, the two insulating spacers 421 on each mounting strip 42 extend into and isolate the through insulation channel 32 corresponding to the mounting strip 42.

[0019] In addition, the position of the output busbar 5 corresponds one-to-one with the end position of the phase busbar 3 on the switch body 2, and the number is the same. Angle brackets 51 are provided on both sides of the output busbar 5, and the output busbar 5 is fastened to the bottom plate of the drawer seat 1 through the angle brackets 51.

[0020] Of course, in addition to the above embodiments, this utility model may have other various embodiments. Without departing from the essential technical solution of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, and these changes or modifications are equivalent to the technical solution in this patent. Therefore, these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.

Claims

1. A phase-to-phase insulation isolation structure for a frame circuit breaker, comprising a drawer base and a switch body removably disposed within the drawer base, wherein at least two rows of phase-to-phase busbars are erected on the base plate of the switch body, and adjacent phase-to-phase busbars within the same row have a gap, characterized in that: The gaps between the at least two rows of phase busbars are aligned horizontally to form at least one longitudinal through-insulation channel. The drawer seat is provided with a phase insulation isolation structure corresponding to the through-insulation channel. The phase insulation isolation structure includes an insulating plate and mounting strips. The insulating plate is fixedly installed on the inner bottom plate of the drawer seat. The insulating plate and the inner bottom plate of the drawer seat have corresponding insertion holes for the phase busbars to pass through. The number of mounting strips is the same as the number of through-insulation channels, and they are spaced above the insulating plate and connected to the inner bottom plate of the drawer seat. The mounting strips are provided with at least two insulating spacers. When the switch body is connected to the drawer seat, the bottom of the phase busbar passes through the insertion holes of the insulating plate and the inner bottom plate of the drawer seat in sequence and is electrically connected to the output busbar provided at the bottom of the drawer seat. The insulating spacers on the mounting strips all extend into and isolate the corresponding through-insulation channels.

2. The phase-to-phase insulation isolation structure of the frame circuit breaker according to claim 1, characterized in that: The mounting strip and the insulating spacer are integrally injection molded from insulating material.

3. The phase-to-phase insulation isolation structure of the frame circuit breaker according to claim 1, characterized in that: The position of the output busbar corresponds to the end position of the phase busbar on the switch body, and the number of output busbars is the same as that of the phase busbars.

4. The phase-to-phase insulation isolation structure of the frame circuit breaker according to claim 1 or 3, characterized in that: Angle brackets are provided on both sides of the output busbar, and the output busbar is fastened to the bottom plate of the drawer seat through the provided angle brackets.

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