Switchgear

Abstract

Switchgear (1) with two circuit breakers (10) arranged in an upper frame and a lower frame of the switchgear (1), wherein three main busbars (4b) which are arranged in the lower frame of the switchgear (1) and which are longer in a width direction than in a thickness direction, have a flat surface and extend in a lateral direction, are arranged parallel to each other in a top-bottom direction, such that the flat surfaces of these face each other, wherein positions at which three branch busbars (6) connecting the three main busbars (4b) to the lower circuit breaker (10) are connected to the three main busbars (4b) differ from each other in the lateral direction, and wherein the positions in the lateral direction where the three branch busbars (6) are connected to the three main busbars (4b) correspond to gaps between three power cable connecting conductors (5) arranged side by side in the lateral direction.

Description

TECHNICAL AREA

[0001] The present disclosure relates to the area of ​​a switchgear in which two circuit breakers are arranged in an upper and a lower frame. BACKGROUND TECHNOLOGY

[0002] A switchgear in which two circuit breakers are arranged in an upper and a lower frame is effective as a space-saving switchgear, since the space required for arrangement can be significantly reduced compared to a conventional switchgear which has only one circuit breaker.

[0003] During the installation of this switchgear, in which two circuit breakers are arranged in an upper and a lower frame, work to connect a main busbar to the upper circuit breaker is carried out from a roof part of the switchgear, and work to connect a main busbar to the lower circuit breaker is carried out from a rear of the switchgear, see, for example, WO 2019 / 111 378 A1.

[0004] The printed document JP H11205917 A shows an upper fixed plate, mounted longitudinally and attached to an upper part of a bus frame on both sides. A lower fixed plate is attached to a lower part of the bus frame in this way. Two guide pins are inserted through each of the upper and lower fixed plates. An upper plate is mounted on the upper fixed plate. Guide holes are formed in the outer parts of the guide frames on both sides of the upper plate, into which the guide pins are loosely inserted, and rollers are housed inside. A lower plate is mounted on the lower fixed plate. The guide pins are then loosely inserted into the guide holes of the guide frames on both sides of the lower plate 13. A bus partition panel is connected to the rear end of the upper and lower plates by means of a shaft and a hinge.

[0005] Publication JP 2017034867 A shows a switchgear assembly comprising a circuit breaker module as its basic functional module. This module consists of a circuit breaker compartment for housing device units, each with a loaded circuit breaker in two upper and lower stages, and a control compartment located in front of the circuit breaker compartment, which has a door on the front for housing a control circuit for the device unit. The switchgear assembly further includes a bus module, which houses a main bus, and a cable module, which houses an external line cable. The cable module is located on the side of the circuit breaker module, and the busbar module is located in the upper part, forming a front-operated and front-maintained switchgear assembly. By changing the combination of the cable module and the bus module, a front-operated and rear-maintained switchgear assembly is achieved. Brief description of the invention; problems to be solved by the invention

[0006] When installing a switchgear where two circuit breakers are arranged in an upper and a lower rack, the work to connect a main busbar to the lower circuit breakers of the adjacent switchgear is generally carried out from the rear of the switchgear, as described above. However, this requires removing a main busbar conductor to which a power cable is connected and therefore demands a high level of expertise and is time-consuming.

[0007] The present disclosure was made to solve the aforementioned problem, and it is an objective of the present disclosure to make it possible to easily perform work to connect a main busbar in a short time during the installation work of a switchgear assembly. SOLVING THE PROBLEMS

[0008] A switchgear assembly according to one aspect of the present disclosure comprises two circuit breakers arranged in an upper frame and a lower frame of the switchgear assembly, respectively, wherein three main busbars arranged in the lower frame of the switchgear assembly, which are longer in a width direction than in a thickness direction, have a flat surface and extend in a lateral direction, are arranged parallel to each other in a top-bottom direction such that their flat surfaces face each other, wherein positions at which three branch busbars connecting the three main busbars to the lower circuit breaker are connected to the three main busbars differ from each other in the lateral direction, wherein the positions in the lateral direction at which the three branch busbars are connected to the three main busbarsThe gaps between three power cable connection conductors correspond to those arranged side by side in the lateral direction. Furthermore, according to another aspect, a switchgear assembly with two circuit breakers is provided, arranged in an upper frame and a lower frame of the switchgear assembly, respectively. Three main busbars, arranged in the lower frame of the switchgear assembly and longer in a width direction than in a thickness direction, have a flat surface and extend in a lateral direction, are arranged parallel to each other in a top-bottom direction, such that their flat surfaces face each other. Positions at which three branch busbars connecting the three main busbars to the lower circuit breaker are connected to the three main busbars differ from each other in the lateral direction, with a central one of the three main busbars being...which are arranged parallel to each other in the top-bottom direction, are attached to a support frame made of metal, with an insulator in between, the support frame made of metal having a recess at a position adjacent to the branch busbars. EFFECT OF INVENTION

[0009] According to the switchgear of the present disclosure, work to connect main busbar conductors can be easily carried out in a short time during installation work. BRIEF DESCRIPTION OF THE DRAWINGS [ Fig. 1] Fig. Figure 1 shows a side cross-sectional view of a switchgear assembly according to the first embodiment. [ Fig. 2] Fig. Figure 2 represents an arrangement of main busbars and power cable connecting conductors when viewed from an XX cross-section in Fig. 1. [ Fig. 3] Fig. Figure 3 shows a perspective view of a support frame holding a main power rail. [ Fig. 4] Fig. Figure 4 shows a perspective view representing an arrangement of main busbars and branch busbars when viewed from a YY cross-section in Fig. 1. DESCRIPTION OF EXECUTION FORMS

[0010] In the description of the embodiment and the drawings, parts designated by the same reference numerals indicate the same or corresponding parts. First embodiment.

[0011] An arrangement of main busbars of a switchgear assembly according to the first embodiment of the present disclosure is described with reference to the Fig. 1 and Fig. 2 described. Fig. Figure 1 shows a side cross-sectional view of the switchgear according to the embodiment of the present disclosure and Fig. Figure 2 represents an arrangement of the main busbars and power cable connecting conductors when viewed from an XX cross-section of the switchgear.

[0012] As in Fig. As shown in Figure 1, the switchgear 1 has a two-frame structure in which circuit breakers 10 are arranged in an upper and a lower frame, respectively, and has three-phase main busbars 4a in the upper frame and three-phase main busbars 4b in the lower frame. Fig. 1 The switchgear 1 has working surfaces 11 on the left side and the upper and lower circuit breakers 10 and a control chamber 8 are arranged adjacent to the working surfaces in the upper and lower frame respectively.

[0013] The switchgear 1 has rear doors 9 on the right side and cable compartments 3 on the inner sides of the rear doors 9. In each of the upper and lower cable compartments 3, a power cable connection conductor 5 is equipped with a current transformer 13 and connected to an earthing switch 12.

[0014] Main busbar chambers 2 are arranged in the upper and lower frames, respectively, forming a central part of the switchgear 1. Although each of the main busbars 4a and 4b has a rectangular cross-sectional shape in Fig. 1, each of the main busbars 4a and 4b is a rail-shaped conductor that is longer in a width direction than in a thickness direction, has a flat surface and extends in a direction perpendicular to the surface of the paper on which Fig. 1 is drawn.

[0015] In the embodiment of the present disclosure, the upper main busbars 4a are arranged triangularly, and one of the three main busbars 4a is located on a front face of the switchgear 1 relative to the other main busbars 4a. In a case where the main busbars 4a are arranged in this way, connection work can be carried out from an upper surface of the switchgear 1 during installation work and can therefore be carried out relatively easily.

[0016] As with the lower main busbars 4b, installation work must be carried out from the rear of the switchgear 1. If the lower main busbars 4b are arranged triangularly, as in the upper rack, it is difficult to connect a main busbar 4b from the rear or back surface that is located on the front of the switchgear 1. Therefore, the main busbars 4b must be partially removed to carry out the connection work. This requires a high level of expertise and is time-consuming.

[0017] However, in the embodiment of the present disclosure, which is in Fig. As shown in Figure 1, the lower main busbars 4b extend in a direction perpendicular to the surface of the paper on the Fig. Figure 1 shows the flat surfaces facing each other. Therefore, the arrangement of the lower main busbars 4b differs from the conventional triangular arrangement of main busbars in that the three lower main busbars 4b are arranged parallel to each other in a top-bottom direction.

[0018] Fig. Figure 2 represents a positional relationship between the main busbars 4b and the power cable connection conductors 5 in an XX plane of the switchgear 1 viewed from the rear.

[0019] As in Fig. Figure 2 shows that the power cable connection conductors 5 are similar to the main busbars 4b in that they are also rail-shaped conductors with a flat surface. However, the three power cable connection conductors 5 are arranged side by side in a lateral direction, so that their flat surfaces face a front-to-back direction of the installation. This means that the power cable connection conductors 5 are arranged orthogonally to the main busbars 4b.

[0020] This means that in the embodiment of the present disclosure, the three main current rails 4b are arranged in the top-bottom direction on a back side (a remote side on the paper on the Fig. 2 is shown) the three power cable connection conductors 5 are arranged side by side in the lateral direction, as shown in the Fig. 1 and Fig. Figure 2 illustrates this. During installation, the main busbars 4b can be connected from the rear surface through gaps between the power cable connection conductors 5. Therefore, the installation work can be carried out easily without the need to, for example, remove the main busbars 4b.

[0021] In the embodiment of the present disclosure, the three main busbars 4b extend in the lateral direction and are arranged in the top-bottom direction, such that their flat surfaces face each other, as with reference to Fig. 1 described. Three branch busbars 6, which connect the main busbars 4b to the circuit breaker 10 and similar components, must also be removed and arranged in a top-bottom direction. It is difficult to arrange the main busbars 4b and the branch busbars 6 while maintaining sufficient insulation distance between them. Furthermore, the lower main busbars 4b are arranged closer together than in the conventional configuration, where the lower main busbars 4b are arranged in a triangular pattern. This is expected to increase the influence of electromagnetic forces between the lower main busbars 4b. Measures in the present embodiment to address these problems are mainly based on the Fig. 3 and Fig. 4 described.

[0022] The influence of electromagnetic forces is expected to be greatest at a central one of the three main busbars 4b in the embodiment of the present disclosure, in which the three main busbars 4b are arranged in the top-bottom direction. In view of this, a support frame 7, made of iron having a specially improved strength, is used to mount the central main busbar 4b, as shown in the Fig. 2 and Fig. 4 shown.

[0023] Fig. Figure 3 shows a perspective view of the support frame 7. The support frame 7 is made of iron, and four sides of it are bent to increase its strength. The central of the three main conductor rails 4b is attached using screw holes (two screw holes on the left side and two screw holes on the right side) of the support frame, which is located in Fig. 3 is shown, with an insulator 14 attached in between.

[0024] The use of the support frame 7 allows the main busbar 4b to be firmly attached, thereby addressing the influence of electromagnetic forces.

[0025] Fig. Figure 4 shows a perspective view of the lower main busbar chamber 2 as seen from a YY cross-section of Fig. Figure 1 represents an arrangement of the main busbars 4b and the branch busbars 6. As described above, each of the main busbars 4b has a flat rail shape and extends laterally in Fig. 4. Furthermore, the three main busbars 4b are arranged linearly in the top-bottom direction, so that their flat surfaces face each other.

[0026] The branch busbars 6 are connected to the respective main busbar 4b.

[0027] The connection positions between the main busbars 4b and the branch busbars 6 are different from each other, i.e., they differ from each other in the lateral direction. This means that in the example of the Fig. 4 the uppermost main busbar 4b is connected to the corresponding branch busbar 6 on the right side, the lowermost main busbar 4b is connected to the corresponding branch busbar 6 on the left side and the central main busbar 4b is connected to the corresponding branch busbar 6 in a central part.

[0028] This can increase a gap between the main busbars 4b, increase a gap between branch busbars 6, and increase a gap between a main busbar 4b and a branch busbar 6, thereby reducing the influence of the electromagnetic force on each of the others.

[0029] It is important that the connection positions between the three main busbars 4b and the branch busbars 6 differ from each other laterally, but do not have to be on the left, right, and central sides as described above. Furthermore, the connection positions do not have to be arranged at equal intervals and can be offset to the right or left. Additionally, the relationship between the connection positions and the power cable connection conductors 5 adjacent to the main busbars 4b is not particularly restricted. The connection positions can coincide with positions where the main busbars 4b and the power cable connection conductors 5 overlap and intersect, or they can be arranged at positions corresponding to gaps between the power cable connection conductors 5.

[0030] As described above, the central of the three main busbars 4b is mounted on the iron support frame 7 with the insulator 14 positioned between them. It is therefore feared that the influence of electromagnetic force on this main busbar 4b will be greater than on the other main busbars 4b because the branch busbar 6, which is connected to the main busbar 4b, is close to the support frame 7. In light of this, in the embodiment of the present disclosure, the branch busbar 6 is bent downwards to run away from the support frame 7, and the support frame 7 is partially recessed to maintain a distance from the branch busbar 6.

[0031] In the embodiment of the present disclosure, the shape of the recess of the support frame 7 is a trapezoidal shape as in Fig.Figure 3 is shown, but is not limited to this and can, for example, be rectangular or circular. The support frame 7 has a single recess in the embodiment of the present disclosure, but it can have a plurality of recesses as required.

[0032] Since the support frame 7 has a recess and the branch busbar 6 is bent away from the support frame 7, it is possible to obtain a large insulation distance between the support frame 7 and the branch busbar 6 and to reduce the influence of electromagnetic force.

[0033] As described above, in the switchgear 1, which has the two-frame structure of the circuit breakers 10 according to the embodiment of the present disclosure, the three main busbars 4b, each extending laterally, are arranged in the top-bottom direction, and the power cable connecting conductors 5, which extend in the top-bottom direction, are arranged side by side in the lateral direction. Therefore, installation work can be carried out easily without the need for work such as removing the main busbars 4b.

[0034] Furthermore, the connection positions between the main busbars 4b and the branch busbars 6 are different positions from each other when viewed in the lateral direction. This can reduce the influence of electromagnetic forces.

[0035] Furthermore, the central main busbar 4b is firmly fixed using the support frame 7, which is made of iron. The support frame 7 has a recess in one section near the branch busbar 6, and the branch busbar 6 is bent away from the support frame 7. This allows for a large insulation distance, thus preventing the influence of electromagnetic forces. DESCRIPTION OF REFERENCE MARKS 1 Switchgear 2 Main busbar chamber 3 cable chamber 4a,4b Main busbar 5 power cable connection conductors 6 branch busbar 7 support frames 8 Tax Chamber 9 Back door 10 circuit breakers 11 work surface 12 earthing switches 13 Current transformer 14 Insulator

Claims

Switchgear (1) with two circuit breakers (10) mounted in an upper frame ora lower frame of the switchgear (1), wherein three main busbars (4b) arranged in the lower frame of the switchgear (1), which are longer in a width direction than in a thickness direction, have a flat surface and extend in a lateral direction, are arranged parallel to each other in a top-bottom direction, such that the flat surfaces of these face each other, wherein positions at which three branch busbars (6) connecting the three main busbars (4b) to the lower circuit breaker (10) are connected to the three main busbars (4b) differ from each other in the lateral direction, and wherein the positions in the lateral direction at which the three branch busbars (6) are connected to the three main busbars (4b) correspond to gaps between three power cable connecting conductors (5) arranged side by side in the lateral direction. Switchgear according to claim 1, wherein a central one of the three main busbars (4b) which are arranged parallel to each other in the top-bottom direction is attached to a support frame (7) made of a metal, with an insulator (14) arranged between them, wherein the support frame (7) made of the metal has a recess at a position adjacent to the branch busbars (6). Switchgear (1) with two circuit breakers (10) arranged in an upper frame and a lower frame of the switchgear (1), wherein three main busbars (4b) arranged in the lower frame of the switchgear (1), which are longer in a width direction than in a thickness direction, have a flat surface and extend in a lateral direction, are arranged parallel to each other in a top-bottom direction, such that the flat surfaces of these face each other, wherein positions at which three branch busbars (6), which connect the three main busbars (4b) to the lower circuit breaker (10), are connected to the three main busbars (4b) differ from each other in the lateral direction, wherein a central one of the three main busbars (4b), which are arranged parallel to each other in the top-bottom direction, is attached to a support frame (7) made of a metal,with an insulator (14) arranged between them, and wherein the support frame (7), which is made of metal, has a recess at a position adjacent to the branch busbars (6).

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