Low-voltage switch cabinet

Abstract

The invention discloses a low-voltage switch cabinet, which internally comprises a frame wire inlet chamber for accommodating a wire inlet busbar and a circuit breaker, the frame feeder chamber comprises a front feeder chamber and a rear feeder chamber which are symmetrical, and the front feeder chamber and the rear feeder chamber respectively accommodate the bus bars which are arranged in pairs; the cable chamber is used for accommodating a cable; the front feeder chamber and the rear feeder chamber are located between the wire inlet chamber and the cable chamber, and a bus bar device in the low-voltage switch cabinet adopts a symmetrical design and a staggered lap joint mode, so that the maximum feeder current of the single-side front feeder chamber can reach 4000 A.

Description

Technical Field

[0001] The invention relates to the field of switch cabinets, in particular to a low-voltage switch cabinet. Background Art

[0002] Low voltage switchgear is suitable for power plants, petroleum, chemical industry, metallurgy, textile, high-rise buildings and other industries for power transmission, distribution and power conversion.

[0003] The traditional way to connect the main and branch busbars in low-voltage electrical cabinets is to directly open holes between the horizontal busbar and the branch busbar for connection. When the switch cabinet is at rated load, the horizontal busbar carries a large rated current. Due to too many holes in the horizontal busbar, the current-carrying conductor of the horizontal busbar will overheat at the connection point, accompanied by certain eddy current hazards, which can easily cause the temperature rise of the horizontal busbar to be too high, reducing its current-carrying capacity, thus causing the system to fail to operate normally, or even the entire electrical system to be paralyzed. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the title of the invention of this application to avoid blurring the purpose of this section, the abstract of the specification and the title of the invention, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the above problems and / or the problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the technical problem to be solved by the present invention is that the current carrying capacity is too low and the busbar temperature rise is too high.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a low voltage switch cabinet, comprising:

[0008] Frame incoming line room, accommodating incoming line busbar and circuit breaker;

[0009] A frame feeder chamber, comprising a symmetrical front feeder chamber and a rear feeder chamber, wherein the front feeder chamber and the rear feeder chamber respectively accommodate busbars arranged in pairs;

[0010] A cable room for accommodating cables;

[0011] The front feeder room and the rear feeder room are located between the incoming line room and the cable room.

[0012] As a preferred solution of the low-voltage switch cabinet of the present invention, the frame incoming line chamber, the front feeder chamber, the rear feeder chamber and the cable chamber are provided with door panels on both sides of the low-voltage switch cabinet.

[0013] As a preferred solution of the low-voltage switchgear of the present invention, the incoming busbar, the circuit breaker and the horizontal busbar are connected in sequence.

[0014] As a preferred solution of the low-voltage switch cabinet of the present invention, the horizontal busbar is connected to the busbar.

[0015] As a preferred solution of the low-voltage switch cabinet of the present invention, wherein: the busbars are arranged in pairs and at least one pair is arranged along the length direction;

[0016] Also included is a lapped busbar, which includes at least two parallel single busbars and is located between the busbars arranged in pairs;

[0017] The busbar is provided with a lapped row, and the same-facing surfaces of adjacent single busbars are connected to lapped rows from different busbars;

[0018] The horizontal busbar includes a plurality of horizontal single rows, which are the same in number as the single busbars and are staggeredly connected.

[0019] As a preferred solution of the low-voltage switchgear described in the present invention, the lap joint row includes a pile head row and a transition row, one end of the pile head row is connected to the busbar, and the other end is connected to the transition row, and the same direction surfaces of adjacent single busbars are connected to transition rows from different busbars.

[0020] As a preferred solution of the low-voltage switch cabinet of the present invention, both sides of the pile head row away from one end of the busbar are connected to the transition row.

[0021] As a preferred solution of the low-voltage switch cabinet of the present invention, wherein: the single busbars are arranged in parallel, one side of the single busbar is a lap joint surface, and the lap joint surface of the single busbar is connected to the transition bar.

[0022] As a preferred solution of the low-voltage switch cabinet described in the present invention, the busbar includes three-phase lapping bars, three groups of lapping bars are correspondingly arranged, and the three groups of lapping busbars are respectively connected to the three-phase lapping bars.

[0023] As a preferred solution of the low-voltage switch cabinet of the present invention, the busbars arranged in pairs are provided with two pairs along the length direction, and the two pairs of busbars are symmetrically arranged.

[0024] Beneficial effects of the present invention: The busbar device inside the low-voltage switch cabinet adopts a symmetrical design and a staggered overlap method, which can ensure that the maximum feeder current in the single-side front feeder room can reach 4000A. The main incoming current is shunted to four groups of busbar devices through the incoming horizontal busbar, the feeder horizontal busbar, and the feeder vertical busbar, wherein each section of the busbar device has a maximum carrying current of 7000A and a modular adapter of 36P, the maximum feeder current in the single-side front feeder room can reach 4000A and the modular adapter can reach 72P, and the maximum feeder current in the double-side front and rear feeder rooms can reach 5000A and the modular adapter can reach 144P. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0026] Figure 1 A schematic diagram of a busbar overlap structure according to an embodiment of the present invention;

[0027] Figure 2 A schematic structural diagram of a lap joint row in a busbar lap joint structure according to an embodiment of the present invention;

[0028] Figure 3 A schematic structural diagram of a three-phase overlap in a busbar overlap structure according to an embodiment of the present invention;

[0029] Figure 4 A schematic diagram of the structure of the overlapping portion of the overlapping row in the busbar overlapping structure according to an embodiment of the present invention;

[0030] Figure 5 A schematic diagram of the structure of staggered overlap in a busbar overlap structure according to an embodiment of the present invention;

[0031] Figure 6 A schematic diagram of the three-dimensional structure of a busbar overlap structure according to an embodiment of the present invention;

[0032] Figure 7 A schematic diagram of a four-group busbar overlap structure according to an embodiment of the present invention;

[0033] Figure 8 A schematic diagram of a copper busbar arrangement structure according to an embodiment of the present invention;

[0034] Fig. 9 A schematic diagram of a low-voltage switch cabinet according to an embodiment of the present invention;

[0035] Fig.10 A schematic diagram of the front of a low-voltage switchgear according to an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0040] Furthermore, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0041] Example 1

[0042] Reference Figures 1 to 4 , which is the first embodiment of the present invention: This embodiment provides a low-voltage switch cabinet, which has the copper busbar arrangement structure in the above embodiment built-in.

[0043] The main body of the low-voltage switchgear is a frame structure with four compartments:

[0044] The frame incoming line chamber 100 is used to accommodate the incoming line busbar 300 and the circuit breaker 400;

[0045] The frame feeder chamber 200 includes a symmetrical front feeder chamber 201 and a rear feeder chamber 202. The front feeder chamber 201 and the rear feeder chamber 202 respectively accommodate paired overlapping busbars 700, and four busbars are distributed in the front feeder chamber 201 and the rear feeder chamber 202, namely: an upper busbar device in the front chamber, a lower busbar device in the front chamber, an upper busbar device in the rear chamber, and a lower busbar device in the rear chamber.

[0046] The cable chamber 500 is used to accommodate cables;

[0047] The front feeder chamber 201 and the rear feeder chamber 202 are located between the incoming line chamber 100 and the cable chamber 500 .

[0048] The low-voltage switchgear has a double-sided door structure, that is, the frame incoming line room 100, the front feeder room 201, the rear feeder room 202, and the cable room 500 are all provided with door panels on both sides of the low-voltage switchgear. The main incoming line current is shunted to the busbar device through the incoming line horizontal busbar, the feeder horizontal busbar, and the feeder vertical busbar. The maximum carrying current of each busbar device can reach 7000A, and the modular adapter can reach 36P. The maximum feeder current of the single-sided front feeder room can reach 4000A, and the modular adapter can reach 72P. The maximum feeder current of the double-sided front and rear feeder rooms can reach 5000A, and the modular adapter can reach 144P.

[0049] Example 2

[0050] Reference Figure 4 , which is the second embodiment of the present invention, and this embodiment is based on the previous embodiment, and is different from the previous embodiment in that: this embodiment provides a copper busbar arrangement structure located in a low-voltage switch cabinet, including an incoming busbar 300, a circuit breaker 400, and a horizontal busbar 800 connected in sequence, and the horizontal busbar 800 is connected to a busbar 600.

[0051] Combined with Figure 4 It can be understood that the horizontal busbar 800 includes several horizontal single rows 301, and the number of horizontal single rows 301 is the same as that of the single busbar 701 and they are staggered. Therefore, the single-phase incoming busbar 300 and the horizontal busbar 800 are both composed of 4 parallel single rows, and the overlap method of the same-phase components is staggered overlap.

[0052] Among them, the current capacity of the circuit breaker is 4000A, and the maximum can reach 7100A. The theoretical current of this solution can reach 5000A, but the rated current of the existing circuit breakers on the market is only 7100A.

[0053] Example 3

[0054] Reference Figures 5 to 7 This embodiment provides a busbar splicing structure inside a low-voltage switch cabinet, including a busbar 600 and a splicing busbar 700; in this embodiment, the splicing busbar 700 is provided with three phases (A, B, C), and the busbar 600 is also provided with three phases (A, B, C), and each phase of the busbar 600 is connected to the corresponding splicing busbar 700.

[0055] The busbars 600 are arranged in pairs and at least one pair is arranged along the length direction. In this embodiment, two pairs, that is, four busbars 600 are arranged, which are colinear and symmetrical.

[0056] The lap busbar 700 is arranged in the low-voltage switch cabinet and along the length direction of the busbar 600 . It includes at least two parallel single busbars 701 and is located between the busbars 600 arranged in pairs.

[0057] The busbar 600 is provided with a lap bar 601, and the lap bar 601 is provided with 3 phases. The 3-phase lap bar 601 is connected to the 3-phase lap busbar 700, and the same-oriented surfaces of adjacent single busbars 701 are connected to the lap bars 601 from different busbars 600, that is, staggered laps, to avoid the lap bars 601 of the same busbar 600 being overlapped to the same single busbar 701, causing heat and temperature rise.

[0058] Example 4

[0059] Reference Figures 7-10 , which is the fourth embodiment of the present invention, is based on the previous embodiment, and is different from the previous embodiment in that:

[0060] The lap bar 601 includes a pile head bar 601a and a transition bar 601b. One end of the pile head bar 601a is connected to the busbar 600 and the other end is connected to the transition bar 601b. The same facing surfaces of adjacent single busbars 701 are connected to transition bars 601b from different busbars 600.

[0061] Combined with Figure 2 It can be understood that the pile head row 601a and the transition row 601b are the same copper row or the pile head row 601a is only connected to one transition row 601b;

[0062] Combined with Figures 7-10 It can be understood that one pile head row 601a can overlap two transition rows 601b, that is, both sides of the pile head row 601a away from the busbar 600 are connected to the transition row 601b. Therefore, the three-phase overlapped row 601 has a total of 6 transition rows 601b, which are overlapped with the 3-phase overlapped busbars 700 respectively. Therefore, each phase overlapped busbar 700 needs to overlap 4 transition rows 601b, which come from the pile head rows 601a of the two opposite busbars 600.

[0063] Furthermore, four single busbars 701 are arranged in parallel, and one side surface of the single busbar 701 is set as an overlapping surface, that is, there are four overlapping surfaces in total and the overlapping surfaces are oriented in the same direction, and the overlapping surface of the single busbar 701 is connected to the transition bar 601b.

[0064] Furthermore, the busbar 600 includes a three-phase strapping bar 601 , and three groups of strapping busbars 700 are correspondingly provided. The three groups of strapping busbars 700 are respectively connected to the three-phase strapping bar 601 .

[0065] Combined with Figures 7 to 9Taking phase B as an example, the single busbars 701 are numbered 1, 2, 3, and 4 from left to right, and the right side of the single busbar 701 is a lap joint surface. Then one lap joint method is: the B-phase transition bar 601b of the left busbar 600 is lap jointed to the single busbars 701 of 1 and 3, and the B-phase transition bar 601b of the right busbar 600 is lap jointed to the single busbars 701 of 2 and 4, that is, the same direction surfaces of adjacent single busbars 701 are connected to transition bars 601b from different busbars 600.

[0066] It is understood that, in one embodiment, reference Fig.10 The low-voltage switch cabinet is arranged with four busbars. Two pairs of busbars 600 are arranged in pairs along the length direction. The two pairs of busbars 600 are symmetrically arranged and distributed on both sides of the low-voltage switch cabinet.

[0067] The overlapping method in this embodiment can ensure that the maximum feeder current in the single-side front feeder room can reach 4000A; the maximum carrying current of each busbar device can reach 7000A (the theoretical current of this scheme can reach 5000A, but the rated current of the existing circuit breakers on the market is only 7100A).

[0068] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0069] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0070] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A low voltage switch cabinet, characterized in that: include: A frame incoming line chamber (100) for accommodating an incoming line busbar (300) and a circuit breaker (400); A frame feeder chamber (200), comprising a symmetrical front feeder chamber (201) and a rear feeder chamber (202), wherein the front feeder chamber (201) and the rear feeder chamber (202) respectively accommodate busbars (600) arranged in pairs; A cable chamber (500) for accommodating cables; The front feeder chamber (201) and the rear feeder chamber (202) are located between the incoming line chamber (100) and the cable chamber (500).

2. The low voltage switch cabinet according to claim 1, characterized in that: The frame incoming line chamber (100), the front feeder chamber (201), the rear feeder chamber (202), and the cable chamber (500) are all provided with door panels on both sides of the low-voltage switch cabinet.

3. The low voltage switch cabinet according to claim 1 or 2, characterized in that: The incoming busbar (300), the circuit breaker (400), and the horizontal busbar (800) are connected in sequence.

4. The low voltage switch cabinet according to claim 3, characterized in that: The horizontal busbar (800) is connected to the busbar (600).

5. The low voltage switch cabinet according to any one of claims 1, 2 and 4, characterized in that: The busbars (600) are arranged in pairs, and at least one pair is arranged along the length direction; It also includes a lapped busbar (700), which includes at least two parallel single busbars (701) and is located between the busbars (600) arranged in pairs; The busbar (600) is provided with a lapped row (601), and the same-oriented surfaces of adjacent single busbars (701) are connected to lapped rows (601) from different busbars (600); The horizontal busbar (800) includes a plurality of horizontal single rows (801), the number of which is the same as that of the single busbar (701) and which are staggeredly connected.

6. The low voltage switch cabinet according to claim 5, characterized in that: The lapped row (601) comprises a pile head row (601a) and a transition row (601b); one end of the pile head row (601a) is connected to the busbar (600), and the other end is connected to the transition row (601b); the same-facing surfaces of adjacent single busbars (701) are connected to transition rows (601b) from different busbars (600).

7. The low voltage switch cabinet according to claim 6, characterized in that: Both sides of the pile head row (601a) away from one end of the busbar (600) are connected to the transition row (601b).

8. The low voltage switch cabinet according to claim 7, characterized in that: Four single busbars (701) are arranged in parallel, and one side surface of the single busbar (701) is a lap joint surface. The lap joint surface of the single busbar (701) is connected to the transition bar (601b).

9. The low voltage switch cabinet according to any one of claims 6 to 8, characterized in that: The busbar (600) includes a three-phase lapped busbar (601), and three groups of lapped busbars (700) are correspondingly provided. The three groups of lapped busbars (700) are respectively connected to the three-phase lapped busbars (601).

10. The low voltage switch cabinet according to claim 9, characterized in that: The busbars (600) arranged in pairs are arranged in two pairs along the length direction, and the two pairs of busbars (600) are arranged symmetrically.

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