Power transmission and distribution apparatus

Abstract

To provide a power transmission and distribution apparatus having a configuration suitable for automation of manufacturing.SOLUTION: A power transmission and distribution apparatus comprises a housing 11a accommodating electrical components, and is configured to switch a load current flowing through a distribution line. The power transmission and distribution apparatus is provided with a frame 18 to which electrical components such as a current transformer 8 and a residual current transformer 7 are attached, and the frame 18 is attached to an inner surface of the housing 11a.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a power transmission and distribution device. [Background technology]

[0002] It is disclosed that in a switch in which a voltage detector and a zero-phase current detector are housed within a housing, a current sensor head and a voltage sensor head that convert electrical signals into optical signals are respectively provided in the voltage detector, and the detected optical signals are transmitted to a measuring unit via optical fiber, and a voltage sensor head that converts electrical signals into optical signals is provided in the zero-phase current detector, and the detected optical signals are transmitted to the measuring unit via optical fiber (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 6-52747 Summary of the Invention [Problem to be solved by the invention]

[0004] In the manufacturing process of power transmission and distribution devices such as switches and circuit breakers, sensors such as voltage detectors and zero-phase current detectors, and electrical devices (hereinafter referred to as sensors, etc.) are attached to the inner surface of the housing. Therefore, in the manufacturing process of power transmission and distribution devices, when attaching sensors, etc. to the housing, a worker has traditionally pressed the sensor, etc. against the inner surface of the housing with one hand while fastening it with screws, etc. Therefore, there has been a problem in that the work of attaching sensors, etc. to the housing is inefficient.

[0005] In response to these problems, attempts have been made to automate the manufacturing process of power transmission and distribution devices, including the installation of sensors and other components on the housing. However, as mentioned above, because sensors and other components are installed on the inner surface of the housing, robot arms and other devices must penetrate deep into the housing, making automation difficult. However, Patent Document 1 does not devise a solution to this problem and is unable to solve it.

[0006] The present invention has been made in view of the above circumstances, and has an object to provide a power transmission and distribution device having a configuration suitable for automating the manufacturing process. [Means for solving the problem]

[0007] The power transmission and distribution device of the present invention is a power transmission and distribution device that has a housing that houses electrical components and can switch the load current flowing through a distribution line, and has a frame body to which at least one of electrical components related to measuring voltage or current and electrical components related to switching the load current is attached, and the frame body is attached to the inner surface of the housing. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a power transmission and distribution device having a configuration suitable for automated manufacturing. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a front view of a switch according to a first embodiment. [Figure 2] FIG. 2 is a bottom view of the switch according to the first embodiment. [Figure 3] 1 is a bottom view of the switch according to the first embodiment with the fixed contact, the flexible conductor, and the movable contact removed. FIG. [Figure 4] FIG. 4 is a longitudinal cross-sectional view taken along line IV-IV in FIG. 3. [Figure 5] 1 is a vertical cross-sectional view schematically showing the configuration of a main part of a switch according to a first embodiment. [Figure 6] FIG. 10 is a vertical cross-sectional view schematically showing the configuration of a main part of a switch according to a second embodiment. [Figure 7] FIG. 10 is a vertical cross-sectional view schematically showing the configuration of a main part of a switch according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, a power transmission and distribution device according to the present invention will be described with reference to the drawings showing an embodiment thereof. The power transmission and distribution device includes, for example, a switch, a circuit breaker, etc. In the following, a switch will be described as an example of the power transmission and distribution device.

[0011] (Embodiment 1) 1 is a front view of a switch 10 according to the first embodiment. The switch 10 includes a housing 11. The housing 11 contains electrical components and includes an upper housing 11a (case member) having a housing shape with an open bottom and a lower housing 11b having a housing shape with an open top, with the upper housing 11a covering the open part of the lower housing 11b. The upper housing 11a and the lower housing 11b are fastened together, for example, by screws at their edges.

[0012] A hanging fitting 12 is provided on the top surface of the upper housing 11a. The switch 10 is hung from an overhead line (not shown) by the hanging fitting 12, and is attached to a utility pole by a fastening fitting (not shown) or the like.

[0013] Three-phase bushings 13u, 13v, 13w and bushings 14u, 14v, 14w are provided on both side walls of upper housing 11a that face each other in the left-right direction. More specifically, bushings 13u, 13v, 13w are inserted into the left side wall, and bushings 14u, 14v, 14w are inserted into the right side wall. For example, power supply-side lines (distribution lines) are connected to bushings 13u, 13v, 13w via terminals, and load-side lines (distribution lines) are connected to bushings 14u, 14v, 14w via terminals.

[0014] A handle 6 for operating the switching mechanism 1 housed inside the upper housing 11a is rotatably provided on the front side wall of the upper housing 11a. A metal outlet (not shown), for example, is provided near the center of the handle 6 in the longitudinal direction. By appropriately rotating the handle 6, the state of the switch 10 can be switched on and off.

[0015] The switching mechanism 1 moves a movable contact 17 (movable electrode) as described below in response to the rotation of the handle 6. In addition, a pointer 50 that rotates with the rotation of the drive shaft and indicates the state of the switch 10 is attached to the back side wall of the upper housing 11a opposite to the front side wall.

[0016] Fig. 2 is a bottom view of the switch 10 according to the embodiment 1. Fig. 2 is a bottom view in a state where the lower housing 11b of the switch 10 is removed. For convenience, in Fig. 2, the switching mechanism 1 and the handle 6 are shown simply by dashed lines.

[0017] As described above, the upper housing 11a accommodates electrical components related to voltage or current measurement, electrical components related to switching the load current, and the like. For example, the upper housing 11a accommodates the switching mechanism 1, as well as a zero-phase current transformer (ZCT) 7, a current transformer (CT) 8, fixed contacts 15, a flexible conductor 16, and a movable contact 17. The upper housing 11a also accommodates a zero-phase voltage detector (ZPD) 9 including a transformer 91 and a capacitor 92. That is, the electrical components related to voltage or current measurement include the zero-phase current transformer 7, the current transformer 8, and the zero-phase voltage detector 9, and the electrical components related to switching the load current include the switching mechanism 1, the fixed contacts 15, the flexible conductor 16, and the movable contact 17.

[0018] The upper housing 11a houses a frame 18 incorporating the zero-phase current transformer 7, the current transformer 8, the transformer 91, and the capacitor 92. That is, the zero-phase current transformer 7, the current transformer 8, the transformer 91, and the capacitor 92 are housed in the upper housing 11a while attached to the frame 18, and the frame 18 is attached to the inner surface of the upper housing 11a. The following description will be given taking as an example a case in which both the zero-phase current transformer 7 and the current transformer 8 are attached to the frame 18, but the present invention is not limited to this and a configuration in which only one of them is attached may also be used.

[0019] The frame 18 has two opposing plates 181, 182 that face each other in the left-right direction. The opposing plate 181 is substantially rectangular and is disposed opposite the left side wall of the upper housing 11a, and the opposing plate 182 is rectangular and is disposed opposite the right side wall of the upper housing 11a. For ease of explanation, hereinafter, the opposing plate 181 disposed opposite the left side wall of the upper housing 11a will be referred to as the left opposing plate 181 (the other opposing plate), and the opposing plate 182 disposed opposite the right side wall of the upper housing 11a will be referred to as the right opposing plate 182 (one opposing plate).

[0020] Fig. 3 is a bottom view of the switch 10 according to the first embodiment with the fixed contact 15, the flexible conductor 16, and the movable contact 17 removed, and Fig. 4 is a vertical cross-sectional view taken along line IV-IV in Fig. 3. For convenience, the switching mechanism 1 and the handle 6 are shown simplified with dashed lines in Fig. 3 and Fig. 4. In Fig. 4, the current transformer 8 is shown with a dashed line to indicate the positional relationship between the zero-phase current transformer 7 and the current transformer 8.

[0021] Three through holes 19L are arranged in the front-rear direction in the left facing plate 181 (see FIG. 4). More specifically, three through holes 110, through which the bushings 13u, 13v, and 13w pass, are arranged in the front-rear direction in the left side wall of the upper housing 11a, and through holes 19L are formed in the left facing plate 181 at positions that align with the through holes 110 in the upper housing 11a. The bushings 13u, 13v, and 13w are inserted into the upper housing 11a through the through holes 110 in the upper housing 11a and the through holes 19L in the frame 18.

[0022] Conductors 131u, 131v, and 131w are embedded inside the bushings 13u, 13v, and 13w, respectively (see FIG. 2). Therefore, the conductors 131u, 131v, and 131w, together with the bushings 13u, 13v, and 13w, are also inserted into the upper housing 11a through the through-hole 110 of the upper housing 11a and the through-hole 19L of the frame 18.

[0023] Three through holes 19R are arranged in the front-rear direction in the right-side opposing plate 182 (see FIG. 5). More specifically, three through holes 120, through which the bushings 14u, 14v, and 14w pass, are arranged in the front-rear direction in the right side wall of the upper housing 11a, and the through holes 19R are formed in the right-side opposing plate 182 at positions that align with the through holes 120 in the upper housing 11a. The through holes 19R are also formed at positions that correspond in the left-right direction to the through holes 19L in the left-side opposing plate 181. The bushings 14u, 14v, and 14w are inserted into the upper housing 11a through the through holes 120 in the upper housing 11a and the through holes 19R in the frame 18.

[0024] Conductors 141u, 141v, and 141w are embedded inside the bushings 14u, 14v, and 14w, respectively. Therefore, the conductors 141u, 141v, and 141w, together with the bushings 14u, 14v, and 14w, are inserted into the upper housing 11a through the through-hole 120 in the upper housing 11a and the through-hole 19R in the frame 18.

[0025] A rectangular connecting plate 183 is interposed between the left facing plate 181 and the right facing plate 182, and the upper edges of the left facing plate 181 and the right facing plate 182 are connected to each other by the connecting plate 183. In other words, the connecting plate 183 is connected to the upper edge of the left facing plate 181 in a direction intersecting the direction in which the through holes 19L are arranged side by side, and to the upper edge of the right facing plate 182 in a direction intersecting the direction in which the through holes 19R are arranged side by side.

[0026] That is, the frame body 18 has an inverted U-shape in a vertical cross section, and portions opposing each other in the front-rear direction are omitted, leaving the frame body 18 open in the front-rear direction.

[0027] As described above, the bushings 13u, 13v, and 13w penetrate the left side wall of the upper housing 11a and the left opposing plate 181 of the frame 18. Fixed contacts 15 are provided at the tip of each of the bushings 13u, 13v, and 13w inside the upper housing 11a (frame 18). The terminals of each of the bushings 13u, 13v, and 13w outside the housing 11 are electrically connected to the corresponding fixed contacts 15 via the conductors 131u, 131v, and 131w of each of the bushings 13u, 13v, and 13w.

[0028] As described above, the bushings 14u, 14v, and 14w penetrate the right side wall of the upper housing 11a and the right opposing plate 182 of the frame 18. Flexible conductors 16 are provided at the tip of each of the bushings 14u, 14v, and 14w inside the upper housing 11a (frame 18). The flexible conductors 16 are made of woven thin electric wires and are deformable. The terminals of each of the bushings 14u, 14v, and 14w on the outside of the housing 11 are electrically connected to the corresponding flexible conductors 16 via the conductors 141u, 141v, and 141w of each of the bushings 14u, 14v, and 14w.

[0029] A movable contact 17 is provided at the tip of the flexible conductor 16. The movable contact 17 can be moved by the switching mechanism 1 in a direction toward or away from the fixed contact 15 in response to operation of the handle 6. That is, operation of the handle 6 electrically connects or separates the fixed contact 15 and the movable contact 17.

[0030] The zero-phase-sequence current transformer 7 is attached to the inner surface of the left opposing plate 181 of the frame 18. The zero-phase-sequence current transformer 7 has an oval shape extending in the front-to-rear direction and is disposed so as to surround the three through-holes 19L. In other words, the three through-holes 19L are formed inside the zero-phase-sequence current transformer 7. For example, the zero-phase-sequence current transformer 7 is fixed to the left opposing plate 181 with screws.

[0031] Three current transformers 8 are attached to the inner surface of the right-side facing plate 182 of the frame 18. Each current transformer 8 is toric in shape and is disposed so as to surround a corresponding through-hole 19R. That is, the inner diameter of each current transformer 8 is slightly larger than the diameter of the corresponding through-hole 19R, and each current transformer 8 is disposed on the same axis as the corresponding through-hole 19R. For example, each current transformer 8 is screwed to the right-side facing plate 182. Furthermore, as shown in FIG. 4, the three current transformers 8 are disposed at positions corresponding to the zero-phase-sequence current transformers 7 in the left-right direction.

[0032] Three capacitors 92 are attached to the inner surface of the connecting plate 183 of the frame 18. The three capacitors 92 are arranged side by side in the front-to-rear direction in the center of the connecting plate 183. Each capacitor 92 has a substantially cylindrical shape and protrudes from the inner surface of the connecting plate 183, and is electrically connected to the flexible conductor 16.

[0033] A transformer 91 is attached to the inner surface of the connecting plate 183 of the frame 18. The transformer 91 is disposed near the middle capacitor 92 of the three capacitors 92 and close to the left opposing plate 181. More specifically, the transformer 91 is disposed in the center of the edge of the connecting plate 183 on the side of the left opposing plate 181, above the zero-phase-sequence current transformer 7.

[0034] Fig. 5 is a vertical cross-sectional view schematically showing the configuration of the main parts of the switch 10 according to embodiment 1. For ease of explanation, Fig. 5 shows the switching mechanism 1 by a dashed line, and only shows the positional relationship between the zero-phase current transformer 7, the current transformer 8, the transformer 91, the capacitor 92, the frame 18, and the upper housing 11a.

[0035] In the frame body 18, the left-side opposing plate 181 is fixed at its lower end to the left side wall of the upper housing 11a by screws S, the right-side opposing plate 182 is fixed at its lower end to the right side wall of the upper housing 11a by screws S, and the connecting plate 183 is fixed near the four corners to the ceiling wall of the upper housing 11a by screws S.

[0036] At this time, a gap G is formed between the frame body 18 and the upper housing 11a. That is, the left facing plate 181 is provided at a distance from the left side wall of the upper housing 11a, the right facing plate 182 is provided at a distance from the right side wall of the upper housing 11a, and the connecting plate 183 is provided at a distance from the ceiling wall of the upper housing 11a.

[0037] In the switch 10 according to the first embodiment, as described above, the zero-phase current transformer 7, the current transformer 8, the transformer 91, and the capacitor 92 are attached to the frame 18 and housed in the upper housing 11a. With this configuration, there is no need to directly attach the zero-phase current transformer 7, current transformer 8, transformer 91, and capacitor 92 to the upper housing 11a, and it is sufficient to simply store the frame 18, into which the zero-phase current transformer 7, current transformer 8, transformer 91, and capacitor 92 have been installed, inside the upper housing 11a and attach it to the upper housing 11a.

[0038] That is, on the open side of upper housing 11a, a robot arm or the like is used to screw the lower end of left facing plate 181 to the left side wall of upper housing 11a with screws S, and the lower end of right facing plate 182 to the right side wall of upper housing 11a with screws S, and also, from the outside of the ceiling wall of upper housing 11a, the connecting plate 183 and the ceiling wall of upper housing 11a are screwed together. Therefore, there is no need for a robot arm or the like to go deep inside upper housing 11a.

[0039] Therefore, it is easy to automate the work of storing the frame 18, into which the zero-phase current transformer 7, current transformer 8, transformer 91, and capacitor 92 have been installed, inside the upper housing 11a and attaching it to the upper housing 11a (hereinafter referred to as the attachment work), and the work of attaching the zero-phase current transformer 7, current transformer 8, transformer 91, and capacitor 92 to the upper housing 11a can be automated, thereby enabling the automation of the manufacturing process of the switch 10, including such attachment work.

[0040] In the switch 10 according to the first embodiment, as described above, the frame 18 is open in the front-rear direction by eliminating portions that face each other in the front-rear direction. Therefore, even when assembling the zero-phase-sequence current transformer 7, the current transformer 8, the transformer 91, and the capacitor 92 into the frame 18, a robot arm or the like can easily enter and exit the inside of the frame 18 from the open side, and the assembling work of the zero-phase-sequence current transformer 7, the current transformer 8, the transformer 91, and the capacitor 92 into the frame 18 can be automated.

[0041] In the switch 10 according to the first embodiment, as described above, the transformer 91 is disposed in the vicinity of the middle capacitor 92 of the three capacitors 92 and at a position close to the left opposing plate 181 (zero-phase-sequence current transformer 7). This makes it possible to minimize the wiring distance from the transformer 91 to the connection destination.

[0042] In the switch 10 according to the first embodiment, as described above, a gap G is formed between the frame 18 and the upper housing 11a. Therefore, during operation of the switch 10, warm air whose temperature has increased due to heat generation in components such as the capacitor 92 rises and passes through the gap G, allowing natural convection along the dashed arrows in Fig. 5. This prevents the warm air from being trapped in the upper part of the upper housing 11a (frame 18).

[0043] (Embodiment 2) Fig. 6 is a vertical cross-sectional view showing a schematic configuration of a main part of a switch 10 according to embodiment 2. For convenience of explanation, Fig. 6 shows the switching mechanism 1 by a dashed line, and only shows the positional relationship between the zero-phase current transformer 7, the current transformer 8, the transformer 91, the capacitor 92, the frame 18, and the upper housing 11a.

[0044] In the switch 10 according to the second embodiment, a fastening member 111 is provided at the lower end of the left side wall of the upper housing 11a. The fastening member 111 has a rectangular shape extending in the left-right direction and protrudes from the inner surface of the left side wall of the upper housing 11a. That is, the fastening member 111 protrudes from the inner surface of the left side wall of the upper housing 11a toward the inside of the upper housing 11a. A screw hole 112 is drilled at the protruding end of the fastening member 111, penetrating the fastening member 111 in the up-down direction.

[0045] In the switch 10 according to the second embodiment, a fastener 121 is provided at the lower end of the right side wall of the upper housing 11a. The fastener 121 has a rectangular shape extending in the left-right direction and protrudes from the inner surface of the right side wall of the upper housing 11a. A screw hole 122 is drilled at the protruding end of the fastener 121, penetrating the fastener 121 in the up-down direction.

[0046] Furthermore, in the switch 10 according to the second embodiment, the lower end of the left opposing plate 181 of the frame 18 is bent vertically outward, with a through-hole 185 formed in the bent portion, and the lower end of the right opposing plate 182 is bent vertically outward, with a through-hole 186 formed in the bent portion. In the vertical direction, the through-hole 185 of the left opposing plate 181 is formed at a position corresponding to the screw hole 112 of the fastener 111, and the through-hole 186 of the right opposing plate 182 is formed at a position corresponding to the screw hole 122 of the fastener 121.

[0047] In the switch 10 according to the second embodiment, a screw S is inserted into a through-hole 185 at the lower end of the left-side opposing plate 181 and is screwed into a screw hole 112 of the fastening member 111, and a screw S is inserted into a through-hole 186 at the lower end of the right-side opposing plate 182 and is screwed into a screw hole 122 of the fastening member 121, and the connecting plate 183 is fixed to the ceiling wall of the upper housing 11a near the four corners by the screws S. At this time, a gap G is formed between the frame 18 and the upper housing 11a.

[0048] With this configuration, in the switch 10 according to the second embodiment, a screwing operation is performed using a robot arm or the like on the open side of the upper housing 11a, in which the through-hole 185 of the left-side opposing plate 181 and the screw hole 112 of the fastening metal fitting 111 are vertically aligned and fastened with the screw S, and the through-hole 186 of the right-side opposing plate 182 and the screw hole 122 of the fastening metal fitting 121 are vertically aligned and fastened with the screw S. In addition, the screw S is used to screw the connecting plate 183 to the ceiling wall of the upper housing 11a from outside the ceiling wall of the upper housing 11a.

[0049] In other words, there is no need to insert a robot arm or the like deep into the upper housing 11a (frame 18), and it is possible to attach the frame 18, which has already been fitted with the zero-phase current transformer 7, current transformer 8, transformer 91, and capacitor 92, to the upper housing 11a, making it easy to automate such attachment work.

[0050] The same parts as those in the first embodiment are denoted by the same reference numerals and detailed description thereof will be omitted.

[0051] (Embodiment 3) Fig. 7 is a vertical cross-sectional view schematically showing the configuration of the main parts of the switch 10 according to embodiment 3. For convenience of explanation, Fig. 7 shows the switching mechanism 1 by a dashed line, and only shows the positional relationship between the zero-phase current transformer 7, the current transformer 8, the transformer 91, the capacitor 92, the frame 18, and the upper housing 11a.

[0052] In the switch 10 according to the third embodiment, a fastener 111A is provided at the lower end of the left sidewall of the upper housing 11a. The fastener 111A is provided on the inner surface of the left sidewall of the upper housing 11a and has a rectangular shape extending in the vertical direction. The fastener 111A protrudes upward beyond the left sidewall of the upper housing 11a. That is, the end of the fastener 111A extends from the open side of the upper housing 11a toward the lower housing 11b, and beyond the upper housing 11a. A screw hole 112A is drilled at the protruding end of the fastener 111A, penetrating the fastener 111A in the left-right direction.

[0053] In the switch 10 according to the third embodiment, a fastener 121A is provided at the lower end of the right side wall of the upper housing 11a. The fastener 121A is provided on the inner surface of the right side wall of the upper housing 11a and has a rectangular shape extending in the vertical direction. The fastener 121A protrudes upward beyond the right side wall of the upper housing 11a. A screw hole 122A is drilled at the protruding end of the fastener 121A, penetrating the fastener 121A in the left-right direction.

[0054] Furthermore, in the switch 10 of embodiment 3, the lower end of the left opposing plate 181 of the frame body 18 protrudes upward beyond the left side wall of the upper housing 11a, and the lower end of the right opposing plate 182 protrudes upward beyond the right side wall of the upper housing 11a.

[0055] A through-hole 185A is formed in the protruding portion of the left opposing plate 181, and a through-hole 186A is formed in the protruding portion of the right opposing plate 182. In the left-right direction, the through-hole 185A in the left opposing plate 181 is formed at a position corresponding to the screw hole 112A of the fastener 111A, and the through-hole 186A in the right opposing plate 182 is formed at a position corresponding to the screw hole 122A of the fastener 121A.

[0056] In the switch 10 according to the third embodiment, a screw S is inserted into the screw hole 112A of the fastening member 111A and is screwed into the through-hole 185A at the lower end of the left-side opposing plate 181, and a screw S is inserted into the screw hole 122A of the fastening member 121A and is screwed into the through-hole 186A at the lower end of the right-side opposing plate 182, and the connecting plate 183 is fixed to the ceiling wall of the upper housing 11a near the four corners by the screws S. At this time, a gap G is formed between the frame 18 and the upper housing 11a.

[0057] With this configuration, in the switch 10 according to the third embodiment, a screwing operation is performed using a robot arm or the like on the outside of the upper housing 11a, in which the through-hole 185A of the left-side opposing plate 181 and the screw hole 112A of the fastening metal fitting 111A are aligned in the left-right direction and fastened with the screw S, and the through-hole 186A of the right-side opposing plate 182 and the screw hole 122A of the fastening metal fitting 121A are aligned in the left-right direction and fastened with the screw S. In addition, the screw S is used to screw the connecting plate 183 to the ceiling wall of the upper housing 11a from the outside of the ceiling wall of the upper housing 11a.

[0058] That is, there is no need to insert a robot arm or the like into the upper housing 11a (housing 11), and such work can be performed outside the upper housing 11a (housing 11). This makes it even easier to automate the work of attaching the frame 18, into which the zero-phase-sequence current transformer 7, current transformer 8, transformer 91, and capacitor 92 have been incorporated, to the upper housing 11a.

[0059] The same parts as those in the first embodiment are denoted by the same reference numerals and detailed description thereof will be omitted.

[0060] In the above, an example has been described in which electrical components related to measuring voltage or current (hereinafter referred to as measuring electrical components) and electrical components related to switching load current (hereinafter referred to as switching electrical components) are housed inside upper housing 11a (housing 11), and the measuring electrical components are attached to frame 18, but this is not limiting. It is also possible to have a configuration in which either the measuring electrical components or the switching electrical components are attached to frame 18, or a configuration in which both the measuring electrical components and the switching electrical components are attached.

[0061] In the above description, an example has been given in which the switching electrical components and measuring electrical components include the switching mechanism 1, the zero-phase current transformer 7, the current transformer 8, the fixed contact 15, the flexible conductor 16, the movable contact 17, and the zero-phase voltage detector 9, but the present invention is not limited to this. The switching electrical components and measuring electrical components may include other electrical components in addition to the above-mentioned electrical components, or may include other electrical components excluding the above-mentioned electrical components.

[0062] The technical features (constituent elements) described in the first to third embodiments can be combined with each other, and by combining them, new technical features can be conceived. The embodiments disclosed herein are illustrative in all respects and should not be considered limiting. The scope of the present invention is defined by the claims, not by the above meaning, and is intended to include all modifications within the meaning and scope of the claims.

[0063] The matters described in each embodiment can be combined with each other. Furthermore, the independent claims and dependent claims described in the claims can be combined with each other in any and all combinations, regardless of the reference format. Furthermore, the claims use a format in which a claim references two or more other claims (multiple claim format), but this is not limited to this. A multiple claim (multi-multi claim) that references at least one other multiple claim may also be used. [Explanation of symbols]

[0064] 7: Zero-phase current transformer, 8: Current transformer, 9: Zero-phase voltage detector, 10: Switch, 11: Housing, 11a: Upper housing (case member), 11b: Lower housing, 18: Frame, 19L: Through-hole, 19R: Through-hole, 91: Transformer, 92: Capacitor, 111, 111A: Fasteners, 131u, 131v, 131w: Conductors, 141u, 141v, 141w: Conductors, 181: Left-side opposing plate (the other opposing plate), 182: Right-side opposing plate (one of the opposing plates), 183: Connecting plate, G: Gap

Claims

1. A power transmission and distribution device that has a housing that houses electrical components and can switch a load current flowing through a power distribution line, a frame body to which at least one of an electric component related to voltage or current measurement and an electric component related to switching the load current is attached, The power transmission and distribution device, wherein the frame body is attached to the inner surface of the housing.

2. The power transmission and distribution device according to claim 1 , wherein a gap is formed between the frame and the housing.

3. The frame body is two opposing plates each having a plurality of through holes arranged in parallel, through which conductors connected to the power distribution line pass; The power transmission and distribution device according to claim 1 , further comprising a connecting plate that connects edges of the opposing plates in a direction intersecting the direction in which the through holes are arranged side by side.

4. the electrical components relating to voltage measurement include a zero-phase voltage detector; The power transmission and distribution device according to claim 3 , wherein a transformer and a plurality of capacitors for the zero-phase voltage detector are provided on an inner surface of the connecting plate.

5. The electrical components related to the current measurement further include a current transformer and a zero-phase current transformer; the current transformer is provided on an inner surface of one of the two opposing plates, and the zero-phase current transformer is provided on an inner surface of the other opposing plate, Three capacitors are provided on the inner surface of the connecting plate along the direction in which the through holes are arranged, The power transmission and distribution device according to claim 4 , wherein the transformer is disposed in the vicinity of the central capacitor and closer to the other opposing plate.

6. the housing has a case member to which the frame body is attached and which has one open side; The other edge of each opposing plate is bent toward the inner surface of the case member, 5. The power transmission and distribution device according to claim 3, wherein fasteners for fastening other edges of the opposing plates with screws are provided on an inner surface of the case member so as to protrude inward from the case member.

7. the housing has a case member to which the frame body is attached and which has one open side; The other edge of each of the opposing plates extends outward from one side of the case member, The case member has an inner surface provided with fastening metal fittings for screwing the other edge portions of the opposing plates, The power transmission and distribution device according to claim 3 or 4, wherein an end of the fastener extends to the outside of the case member.

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