JP2004023888A - Lightning arrester for distribution board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightning arrester for a distribution board which can arrange only one plug-in type branch breaker by removing it and which can sufficiently protect against a lightning surge. <P>SOLUTION: The lightning arrester for the distribution board in which the plug-in type branch breakers inserted into and connected to a conductive bar are arranged in parallel with an extending direction of the conductive bar, includes a base 1 having a width larger in size than the branch breaker, and a bearing blade 2 arranged to a first position corresponding to the width a of the branch breaker in size B from one end in a widthwise direction of the base 1. A protrusion 3 opposed to a window hole formed on a distribution board cover together with a protrusion of a handle of the branch breaker is provided. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a lightning arrester for a distribution board which is disposed in a distribution board side by side with branch breakers.
[0002]
[Prior art]
An example of this type of lightning arrester for a distribution board is disclosed in Japanese Patent Application Laid-Open No. H10-257617. In this device, a surge absorbing element, a fuse, or the like is disposed in a body having a width twice as large as a branch breaker (the branch breaker is 32 mm) (that is, 64 mm), and a light emitting element is mounted on an upper surface of the body. It is exposed, and two branch breakers in the distribution board are removed and arranged next to the branch breakers.
[0003]
[Problems to be solved by the invention]
2. Description of the Related Art In recent years, a plug-in type branch breaker having a width (about 16 mm to 20 mm) smaller than a width (about 32 mm) of a conventional branch breaker has been used for a distribution board for a house in order to reduce the size. (For example, JP-A-2001-157321).
[0004]
In this situation, the conventional lightning arrester for a distribution board having a width of 64 mm has a problem that the number of branch circuits is considerably reduced because the width is too large as compared with the branch breaker. Since the panel lightning arrester is not of the plug-in type, there is a problem that it cannot be arranged next to the branch breaker.
[0005]
Therefore, the present applicant has studied a plug-in type lightning arrester for a distribution board in which a surge absorbing element, a fuse, and the like are disposed in a body having the same width dimension (that is, 16 mm to 20 mm) as the plug-in type branch breaker. However, if the width of the plug-in type branch breaker is the same as that of the branch breaker, the surge absorbing element and the fuse can be disposed only on the voltage pole, and there is a problem that sufficient lightning surge protection cannot be provided.
[0006]
The present invention has been made in view of the above circumstances, and it is an object of the present invention that only one plug-in type branch breaker can be removed and arranged, and that lightning surge protection can be sufficiently provided. It is an object of the present invention to provide a lightning arrester for a distribution board that can be operated.
[0007]
[Means for Solving the Problems]
The lightning arrester for a distribution board according to claim 1, wherein the power distribution board is arranged side by side with the plug-in type branch breaker plugged into the conductive bar in the extending direction of the conductive bar. Lightning arrester,
A vessel formed to have a width larger than the width of the branch breaker, and a dimension from one end in the width direction of the vessel being arranged to a position corresponding to a width corresponding to the width of the branch breaker. And a receiving blade that is inserted and connected to the conductive bar.
[0008]
According to the lightning arrester for a distribution board according to claim 1, the receiving blade inserted and connected to the conductive bar up to a position corresponding to the width of the branch breaker in a dimension from one end in the width direction of the body. Since it is arranged, the portion from one end in the width direction of the body to the position corresponding to the width dimension can be arranged at the position of the outermost plug-in type branch breaker in the distribution board. Only one can be removed and arranged. In addition, since the width of the body is larger than the width of the branch breaker, a surge absorbing element or a fuse can be provided at each pole, and lightning surge protection can be sufficiently performed.
[0009]
The lightning arrester for a distribution board according to claim 2, according to claim 1, is formed on a distribution board cover together with a handle protrusion of the branch breaker on an upper surface from one end in a width direction of the body to a position corresponding to a width dimension. A projection facing the window hole, and an upper surface from the other end of the container to a position corresponding to the width dimension is lower than the projection.
[0010]
According to the lightning arrester for a distribution board according to the second aspect, in addition to the same effect as the first aspect, the protrusion is formed on the upper surface from one end in the width direction of the body to a position corresponding to the width dimension. Since the upper surface from the end to the position corresponding to the width dimension is lower than the protruding part, the part from one end in the width direction of the body to the position corresponding to the width dimension is arranged at the outermost branch breaker arrangement position on the distribution board Then, the protruding part faces the window hole of the distribution board cover, and the part from the other end in the width direction of the body to the position corresponding to the width dimension faces the inside of the distribution board cover. There is no need to widen the window of the cover.
[0011]
According to a third aspect of the present invention, there is provided a lightning arrester for a distribution board according to the first or second aspect, wherein the conductive bar has a connection screw on at least one side in an extending direction thereof. The portion on the leading end side of the conductive bar insertion from the other end to the position corresponding to the width dimension is recessed so as to avoid the connection screw while the receiving blade is inserted and connected to the conductive bar.
[0012]
According to the lightning arrester for a distribution board according to the third aspect, in addition to the same effects as those of the first or second aspect, the conductive bar insertion tip side from the other end in the width direction of the body to the position corresponding to the width dimension. Since the receiving part is recessed so as to avoid the connecting screw in the state where the receiving blade is inserted and connected to the conductive bar, the body part containing the receiving blade is located at the outermost branch breaker installation position on the distribution board. In this case, it is possible to prevent the remaining portion of the body from hitting the connection screw and preventing the conductive bar from being inserted and connected to the receiving blade. For this reason, it is not necessary to dispose the connection screw of the conductive bar at a position separated from the width direction of the lightning arrester, so that it is not necessary to increase the length of the conductive bar and the distribution board can be downsized.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
A first embodiment of the present invention will be described with reference to FIGS. That is, the lightning arrester for distribution board is arranged side by side on the branch breaker 15 in the extending direction of the conductive bars 20a to 20c with respect to the plug-in type branch breaker 15 inserted and connected to the conductive bars 20a to 20c. Things.
[0014]
The distribution board has an inner unit housed in a box 11 as shown in FIG. 2 and is covered with a distribution board cover 12 as shown in FIG. In the inner unit, a main breaker 14 is disposed substantially at the center, a limiter section 16 is disposed on the left side of the main breaker 14, and a large number of branch breakers 15 are disposed on the right side of the main breaker 14. 14a is a handle of the main breaker 14, and 17 is an electric wire insertion knockout hole formed in the box 11.
[0015]
In FIG. 2, one end of a conductor is connected to the lower output terminal (load side) of the main breaker 14, and the other end is located on the side of the main breaker 14, and these conductors are connected to the conductor. It is covered with a cover 18. One end of a conductive bar is connected to the other end of the conductor with a screw 5. The conductive bars 20a to 20c extend in a horizontal direction, that is, a direction perpendicular to the side surface of the main breaker 14, and a large number of branch breakers 15 are arranged side by side along both sides thereof. The lightning arresters 36 for distribution boards are arranged at the positions of the branch breakers which are arranged on both sides of the conductive bars 20a to 20c and closest to the main breaker 14.
[0016]
The mounting of the conductive bars 20a to 20c, the branch breaker 15, and the lightning arrester 36 for the distribution board will be described. As shown in FIG. 5, a pair of frames 21 are vertically arranged on the inner bottom of the box 11 in a horizontal posture, a metal substrate 22 is disposed between the frames 21, and stepped on the frame 21 from both sides of the substrate 22. The side part 23 is engaged, and the side part 23 is attached to the frame 21 by screws 24. A base 25 made of a synthetic resin is mounted on the substrate 22, and a mounting base 26 is mounted on the side part 23 by locking its locking claw 27 into a hook hole 28 of the side part 23. A pillar 29 is provided upright at the center of the left and right ends of the base 25, and a central partition is provided between the pillars 29. A pair of conductive bars 20a and 20b are arranged on both sides of the pillar 29, and are fixed to the base 25 with screws 5 and 30, and both ends of the conductive bar 20c are fixed between the upper ends of the pillar 29 with screws 5 and 30. I have. The screw 5 at one end of each of the conductive bars 20a to 20c is connected to the end of the conductor of the main breaker 14 as described above.
[0017]
In the base 25, positioning portions 31 are arranged in line along the opposite side edges of the conductive bars 20a and 20b, and the conductive bars 20a and 20b are positioned with respect to the central partition portion. A pair of branch connecting portions 32a and 32b are formed along the adjacent side end portions of the conductive bars 20a and 20b on the side of the center partition portion, by the height of the lower two-stage receiving blade 41 of the branch breaker 15 and the lightning arrester 36 for the distribution board. The number of breakers installed is different from each other in height and direction so as to match the height. In other words, the lower branch connecting portion 32a is folded back toward the front so as to be away from the central partition, and the upper branch connecting portion 32b is directed to the conductive bar on the opposite side so as to get over the central partition. The uppermost receiving blade 41 of the branch breaker 15 and the lightning arrester for distribution board 36 is inserted into the conductive bar 20c, and a plurality of mounting holes 37 are formed at the center.
[0018]
The pair of mounting bases 26 have inverted L-shaped engaging claws 32 protruding outward on opposite sides, and a positioning piece 33 of a branch breaker protruding at a position close to the opposite side.
[0019]
The elastic locking piece 38 has a plurality of projections (not shown) on the lower surface, and is pressed into and fixed to a plurality of holes 37 provided in the conductive bar 20c. The elastic locking piece 38 is formed of an elastic material such as a synthetic resin. T-shaped locking portions 39 having the number of branch breakers are provided on both sides of the main body, and an intermediate portion of the leg 39a is elastically supported by the main body. A pair of shoulders 39b protruding outward from the side of the branch breaker 15 are elastically locked to locking claws 34 provided on the branch breaker 15 and the lightning arrester 36 for the distribution board.
[0020]
As shown in FIGS. 6 and 7, each branch breaker 15 has upper and lower horizontal grooves 40 formed at the front end, and a receiving blade 41 serving as a power supply terminal is provided in the horizontal groove 40. The receiving blade 41 is configured such that the receiving button 41 in the pair of lateral grooves 40 can be switched to either one by a switching button 42 exposed on the upper surface of the front end portion. Each branch breaker 15 has a load-side terminal 52 at the rear end, a handle 15a on the upper surface, and locking claws 34 on both sides of the switching button 42 on the upper surface of the front end of the branch breaker 15. Further, a concave portion 45 for inserting the locking claw 32 is formed across the bottom surface and the side surface of each branch breaker 15, and a hook portion 44 for hooking on the locking claw 32 is provided in the concave portion 45. To attach each branch breaker 15, first, the front end of the branch breaker 15 approaches the conductive bars 20a to 20c, the edge of the conductive bar 20c is inserted into the uppermost lateral groove 40 of the front end, and the upper end is inserted into the middle lateral groove 40. The end of the lower branch connecting portion 32b is inserted into the lower lateral groove 40, and the end of the lower branch connecting portion 32a is inserted into the lower horizontal groove 40, and inserted into the receiving blade located in the horizontal groove 40. At the same time, the locking claws 34 are inserted by pushing up both shoulders 39b of the elastic locking pieces 38 from below, and the shoulders 39b are elastically locked to the locking claws 34. The locking claw 32 of the mounting base 26 is fitted into the concave portion 45 on the bottom surface of the branch breaker 15, and the hook portion 44 is hooked on the locking claw 32. The side surface of the branch breaker 15 is positioned on the positioning piece 33, and the branch breaker 15 is fixed by these. When removing the branch breaker 15, the rear end of the leg 39a of the locking portion 39 located at the center of the body of the elastic locking piece 38 is pressed down with a jig or the like to remove the shoulder 39b from the locking claw 34. When the branch breaker 15 is pulled backward, the hook 44 is disengaged from the hook 32, and the blade 41 is disengaged from the branch connecting portions 32a and 32b and the conductive bar 20c.
[0021]
The branch breakers 15 are installed side by side along the conductive bars 20a to 20c as described above, but as shown in FIG. 2, among the branch breakers 15 arranged below the conductive bars 20a to 20c, the branch breakers 15 A lightning arrester 36 for a distribution board, which will be described later, is mounted in the same manner as the branch breaker 15 instead of the closest one.
[0022]
As shown in FIG. 3, a distribution board cover 12 is attached to the box body 11, and the distribution board cover 12 forms a limiter 16a, a window 14 exposing a handle 14a of the main breaker 14 and a handle 15a of the branch breaker 15. are doing. Since the elastic locking piece 38 is covered by the distribution board cover 12, the branching breaker 15 and the like are removed without the elastic locking piece 38 being carelessly pushed unless the distribution board cover 12 is opened. Nothing.
[0023]
FIG. 1 is an external perspective view of a lightning arrester for a distribution board. The lightning arrester 36 for a distribution board has a body 1 formed to have a width A larger than a width a of the branch breaker 15, and a dimension B from one end in the width direction of the body 1 is the width of the branch breaker 15. And a receiving blade 2 which is arranged up to a position corresponding to the width dimension corresponding to the dimension a and is inserted and connected to the conductive bars 20a to 20c. The conductive bars 20a to 20c are arranged in three stages in the vertical direction as described above, and correspondingly, three stages of lateral grooves 57 are formed, and the receiving blade 2 is provided in each lateral groove 57. The dimension B and the dimension a are set to be substantially equal.
[0024]
On the upper surface from one end in the width direction of the container body 1 to a position corresponding to the width dimension, a projection 3 facing a window hole 13 formed in the distribution board cover 12 is provided together with a handle projection having a handle 15 a of the branch breaker 15, The upper surface 4 from the other end of the container 1 to the position corresponding to the width is lower than the protruding portion 3 and is located inside the distribution board cover 12. As described above, the conductive bars 20a to 20c have the connection screws 5 on at least one side in the extending direction, and the conductive bar insertion tips from the other end in the width direction of the body 1 to the position corresponding to the width dimension. The side portion 6 is formed in a notch shape in which the receiving blade 2 is inserted and connected to the conductive bar and is recessed so as to avoid the connection screw 5. Reference numeral 7 denotes a concave portion for mounting the body 1, and a hook 8 corresponding to the hook 44 is provided on the inner surface of the concave 7. The body 1 is divided into two parts by a dividing line 9, internal parts are assembled in a divided state, and the two divided pieces are connected by screws 10. Further, the lower surface 50 corresponding to the upper surface 4 is raised to the height of the positioning piece 33 so as to engage with the positioning piece 33, and a side surface having a width from one end of the body 1 to a position corresponding to the width dimension is formed. Enables positioning. A pair of locking claws 34 having the same configuration as the branch breaker 15 is provided on the upper surface of the front end portion having the lateral groove 57. Light-emitting diodes LED1 and LED2, which will be described later, are exposed on the upper surface of the protrusion 3.
[0025]
The internal configuration of the lightning arrester for distribution board will be described with reference to the circuit diagram of FIG. L1, L2 and N are input blades, F1 to F3 are fuses, E is a ground wire, ZNR1 to ZNR5 are surge absorbing elements, and GA is a gap. LED1 and LED2 are light emitting elements, R1 and R2 are resistors, and D1 and D2 are diodes.
[0026]
The fuses F1 to F3, the surge absorbing elements ZNR3 to ZNR5, and the gap GA are connected in series to the conductive bar through the receiving blades L1, L2, N, and the receiving electrode N is connected to the voltage pole to which the receiving blades L1, L2 are connected. As shown in the figure, the surge absorbing elements ZNR1 and ZNR2 and the light emitting elements LED1 and LED2 are connected between the fuses F1 to F3 between the neutral pole. In a normal state in which a lightning surge has not entered, the light emitting elements LED1 and LED2 are energized and turned on in the order of fuse F2 → light emitting element LED1, LED2 → fuses F1 and F3. When the lightning surge enters, it is discharged in the following order: fuse F1 (F2, F3) → surge absorbing element ZNR3 (ZNR4, ZNR5) → gap GA. That is, the surge between the poles is absorbed by the surge absorbing elements ZNR1 and ZNR2, and the discharge by the gap GA is stopped by the surge absorbing elements ZNR3 to ZNR5.
[0027]
According to the surge arrester for a distribution board of this embodiment, the conductive bars 20a to 20c differ from the width B corresponding to the width a of the branch breaker 15 by a distance B from one end of the body 1 in the width direction. Since the receiving blade 2 is connected to the distribution box, a portion from one end in the width direction of the body 1 to a position corresponding to the width dimension is disposed at the position of the outermost plug-in type branch breaker 15 in the distribution board. Therefore, only one branch breaker 15 can be removed. Further, since the width A of the body 1 is larger than the width a of the branch breaker 15, a surge absorbing element or a fuse can be provided at each pole, and lightning surge protection can be sufficiently performed.
[0028]
Further, the protrusion 3 is formed on the upper surface from one end in the width direction of the container 1 to a position corresponding to the width dimension, and the upper surface 4 from the other end of the container 1 to the position corresponding to the width dimension is lower than the protrusion 3. Therefore, when the portion from one end in the width direction of the housing 1 to the position corresponding to the width dimension is disposed at the outermost branch breaker disposing position in the distribution board, the projection 3 is formed in the window hole 13 of the distribution board cover 12. At the same time, the portion from the other end in the width direction of the body 1 to the position corresponding to the width dimension faces the inside of the distribution board cover 12, so that it is necessary to widen the window hole 13 of the distribution board cover 12. Disappears.
[0029]
The connecting screw 5 is avoided while the receiving blade 2 is inserted and connected to the conductive bar insertion tip portion 6 from the other end in the width direction of the container 1 to the position corresponding to the width dimension. When the body part accommodating the receiving blade 2 is disposed at the position of the outermost branch breaker in the distribution board, the remaining part of the body 1 hits the connection screw 5 because of the concave shape. It is possible to prevent the conductive bars 20a to 20c from being inserted and connected to the receiving blade 2. For this reason, it is not necessary to dispose the connecting screw 5 of the conductive bars 20a to 20c at a position separated from the width direction of the lightning arrester 3, so that it is not necessary to increase the length of the conductive bars 20a to 20c, and The size can be reduced.
[0030]
In addition, this lightning arrester for distribution board is arranged at the position closest to the main breaker 14 on one side of the conductive bars 20a to 20c, but is arranged at the position farthest from the main breaker 14 on the other side of the conductive bars 20a to 20c. You may.
[0031]
A second embodiment of the present invention will be described with reference to FIGS. In the first embodiment, the lightning arrester 36 for the distribution board is arranged at a position closest to the main breaker 14 on one side of each of the conductive bars 20a to 20c, whereas in the second embodiment, the conductive bars 20a to 20c are arranged. 20c is arranged at a position closest to the main breaker 14 on the other side. For this reason, the outer shape, in particular, the positions of the receiving blade 2 and the protruding portion 3 and the positions of the recesses are almost symmetrical. Other configurations are the same as those of the first embodiment, and have the same functions and effects.
[0032]
Further, the lightning arrester for distribution board is arranged at the position on the other side of the conductive bar closest to the main breaker, but may be arranged at the position of the conductive bar farthest from the main breaker.
[0033]
In each of the embodiments, the recesses 7 and 45 into which the locking claw 32 is inserted and the hooking portions 8 and 44 into which the locking claw 32 is hooked may be provided on the branch breaker 15 and the lightning arrester 36, respectively, one by one or in pairs. it can.
[0034]
【The invention's effect】
According to the lightning arrester for a distribution board according to claim 1, the receiving blade inserted and connected to the conductive bar up to a position corresponding to the width of the branch breaker in a dimension from one end in the width direction of the body. Since it is arranged, the portion from one end in the width direction of the body to the position corresponding to the width dimension can be arranged at the position of the outermost plug-in type branch breaker in the distribution board. Only one can be removed and arranged. In addition, since the width of the body is larger than the width of the branch breaker, a surge absorbing element or a fuse can be provided at each pole, and lightning surge protection can be sufficiently performed.
[0035]
According to the lightning arrester for a distribution board according to the second aspect, in addition to the same effect as the first aspect, the protrusion is formed on the upper surface from one end in the width direction of the body to a position corresponding to the width dimension. Since the upper surface from the end to the position corresponding to the width dimension is lower than the protruding part, the part from one end in the width direction of the body to the position corresponding to the width dimension is arranged at the outermost branch breaker arrangement position on the distribution board Then, the protruding part faces the window hole of the distribution board cover, and the part from the other end in the width direction of the body to the position corresponding to the width dimension faces the inside of the distribution board cover. There is no need to widen the window of the cover.
[0036]
According to the lightning arrester for a distribution board according to the third aspect, in addition to the same effects as those of the first or second aspect, the conductive bar insertion tip side from the other end in the width direction of the body to the position corresponding to the width dimension. Since the receiving part is recessed so as to avoid the connecting screw in the state where the receiving blade is inserted and connected to the conductive bar, the body part containing the receiving blade is located at the outermost branch breaker installation position on the distribution board. In this case, it is possible to prevent the remaining portion of the body from hitting the connection screw and preventing the conductive bar from being inserted and connected to the receiving blade. For this reason, it is not necessary to dispose the connection screw of the conductive bar at a position separated from the width direction of the lightning arrester, so that it is not necessary to increase the length of the conductive bar and the distribution board can be downsized.
[Brief description of the drawings]
FIG. 1 is a perspective view of a lightning arrester for a distribution board according to a first embodiment of the present invention.
FIG. 2 is a front view of the distribution board with a distribution board cover removed.
FIG. 3 is a front view of a state in which a cover for a distribution board is mounted.
FIG. 4 is a partially enlarged view of a branch breaker installation location.
FIG. 5 is an exploded perspective view showing a mounting of a conductive bar and a mounting base of a branch breaker.
FIG. 6 is a partial cross-sectional view of a lightning arrester for a distribution board in a mounted state.
FIG. 7 is a partially enlarged perspective view showing an installation state of a branch breaker and a state before installation of a lightning arrester for a distribution board.
FIG. 8 is a circuit diagram of a lightning arrester for a distribution board.
FIG. 9 is a front view of the second embodiment with a distribution board cover removed.
FIG. 10 is a front view of a state where a distribution board cover is mounted.
FIG. 11 is a partially enlarged view of a branch breaker installation location.
FIG. 12 is a partial cross-sectional view of a lightning arrester for a distribution board in an attached state.
FIG. 13 is a perspective view of a mounting base, a branch breaker, and a lightning arrester for a distribution board before mounting.
FIG. 14 is a perspective view of the lightning arrester for distribution board as viewed from the bottom side.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Instrument body 2 Receiving blade 3 Protruding part 4 Upper surface 5 Connection screw 6 Depression part 7 Depression 8 Hook part 9 Division line 12 Distribution board cover 13 Window hole 15 Branch breaker 15a Handles 20a to 20c Conductive bar 33 Positioning piece 34 Lock Claw 36 Lightning arrester 57 for distribution board Side groove A Width B Width a Width

Claims (3)

A lightning arrester for a distribution board arranged side by side in the branch breaker in a direction in which the conductive bar extends with respect to a plug-in type branch breaker inserted and connected to the conductive bar,
A vessel formed to have a width larger than the width of the branch breaker, and a dimension from one end in the width direction of the vessel being arranged to a position corresponding to a width corresponding to the width of the branch breaker. A lightning arrester for a distribution board, comprising: a receiving blade inserted and connected to the conductive bar. On the upper surface from one end in the width direction of the container to a position corresponding to the width dimension, a protrusion facing the window hole formed in the distribution board cover is provided together with the handle protrusion of the branch breaker, and from the other end of the container. The surge arrester for a distribution board according to claim 1, wherein an upper surface up to a position corresponding to the width dimension is lower than the protruding portion. The conductive bar has a connection screw on at least one side in its extending direction, and a portion of the conductive bar insertion tip side from the other end in the width direction of the container to the position corresponding to the width dimension, The lightning arrester for a distribution board according to claim 1 or 2, wherein the receiving blade is recessed so as to avoid the connection screw when the receiving blade is inserted and connected to the conductive bar.

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