JP2014107926A - Retro-fit breaker, and distribution panel modification method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a retro-fit breaker capable of shortening a work time and an outage time by easily performing replacing work from a front face of a distribution panel without disassembling a part of a structure, and to provide a distribution panel modification method using the same.SOLUTION: After an existing breaker is removed from a distribution panel, a second attachment 6 is connected to a bus bar 8 and while inserting the second attachment 6 through an insertion hole 54a, a guide rail 5 is disposed within the distribution panel. A fastening member 4 inserted into a notch 62a is actually fastened by inserting a breaker body 1 into the guide rail unit 5, such that the breaker body 1 is connected to the bus bar 8 in place of the existing breaker.

Description

  The present invention relates to a retrofit circuit breaker provided in a switchboard instead of an existing circuit breaker, and a switchboard repair method using the circuit breaker.

  As a method of updating an old existing circuit breaker (old circuit breaker) housed in an existing switchboard to a new type of new circuit breaker (new circuit breaker), for example, an attachment terminal disclosed in Patent Document 1 There is a method using a retrofit circuit breaker. With the attachment terminal method, after removing the old circuit breaker from the switchboard, the parts (attachment terminals) corresponding to the busbars (connection conductors) of the switchboard are attached to the new circuit breaker, and the switchboard side is not modified significantly. This is a method to update the circuit breaker by using the parts as it is.

  FIG. 7 is a schematic diagram showing a retrofit circuit breaker using a conventional attachment terminal method. The connection between the bus bar 8 of the switchboard and the terminal of the old circuit breaker is disconnected, and the old circuit breaker is taken out of the panel together with the drawer frame. After that, the state where the circuit breaker 101 is prepared is shown. As shown in FIG. 7, an attachment terminal 103 is attached to the circuit breaker terminal 110 of the circuit breaker 101 mounted on the drawer frame 102 so as to match the terminal position of the old circuit breaker. The circuit breaker terminal 110 is connected to the bus bar 8 via the attachment terminal 103. A frame 104 having an installation hole is attached to the drawer frame 102 at a position that matches the installation hole of the old circuit breaker. The circuit breaker 101 is fixed to the switchboard using the installation holes of the frame 104. These circuit breaker 101 are remodeled and installed on site.

JP 2006-94605 A

In the conventional retrofit circuit breaker as described above, it is necessary to perform operations such as attachment of the attachment terminal, attachment of the frame to the drawer frame, and installation of the new circuit breaker at the installation site. Since these operations require a certain amount of time, there is a problem that the downtime (power outage time) of the load equipment that receives power supply from the switchboard becomes long.
In addition, there is a problem that the cost is increased because it involves complicated work such as loading heavy objects into the board at the installation site.
Also, since structures (bus bars, etc.) are generally arranged on the back side (back side) and side surfaces of the switchboard, there is almost no space for people to enter the back side and side surfaces, and work from the back side and side surfaces Is often difficult. The only thing that can easily be done is from the front. However, in the conventional method described above, main circuit connection work (insertion of terminal bolts, etc.) after installation of the drawer frame must be performed on the back side of the circuit breaker after the switchboard is installed at a predetermined position, and is easily performed from the front. I can't. For this reason, conventionally, it has been necessary to dismantle part of the structure to secure a space for the operator to enter.

  The present invention has been made to solve the above-described problems, and its purpose is to facilitate replacement work from the front of the switchboard without disassembling a part of the structure, and to reduce the work time. Another object of the present invention is to provide a circuit breaker for retrofit capable of shortening a power failure time and a method for repairing a distribution board using the circuit breaker.

  The circuit breaker for retrofit according to the present invention is configured such that a circuit breaker body provided with a circuit breaker terminal at the rear, a first attachment attached to the circuit breaker terminal, and the circuit breaker body inserted from the front. And a guide rail unit provided with an insulating plate at the rear, and a second attachment relaying between the circuit breaker terminal and the busbar of the switchboard together with the first attachment. A cutout is formed in one of the first and second attachment terminals, and a fastening member is temporarily fastened to the other of the first and second attachment terminals, and the existing circuit breaker is removed from the switchboard After connecting the second attachment to the bus bar of the switchboard, the guide rail is inserted into the switchboard while inserting the second attachment through the insertion hole. By connecting the circuit breaker body to the bus bar instead of the existing circuit breaker by placing the knit and finally tightening the fastening member inserted in the notch by inserting the circuit breaker body into the guide rail unit It is configured.

  In addition, the switchboard repair method of the present invention is configured such that the circuit breaker body provided with the circuit breaker terminal at the rear, the first attachment attached to the circuit breaker terminal, and the circuit breaker body inserted from the front. A guide rail unit provided with an insulating plate at the rear, and a second attachment that is provided so as to be inserted into an insertion hole formed in the insulating plate and relays between the circuit breaker terminal and the bus bar of the switchboard together with the first attachment. Power distribution board repair using a retrofit circuit breaker in which a notch is formed in one of the first and second attachment terminals and a fastening member is temporarily tightened on the other of the first and second attachment terminals After removing an existing circuit breaker from the switchboard, the second attachment is connected to the bus bar of the switchboard, and the second attachment The guide rail unit is placed in the switchboard while inserting through the insertion hole, and the circuit breaker body is inserted into the guide rail unit so that the fastening member inserted into the notch is fully tightened, so that the existing circuit breaker can be Instead, connect the breaker body to the busbar.

  According to the retrofit circuit breaker and the switchboard repair method using the retrofit circuit breaker of the present invention, the circuit breaker main body is inserted into the guide rail unit, and the fastening member inserted into the notch is finally tightened. Since the circuit breaker body is connected to the bus bar instead of the circuit breaker, the connection work can be done if a tightening tool and hand are in the back of the panel even in a narrow space from the front of the switchboard, and all work must be done from the front of the panel. Can do. Thereby, the replacement work can be easily performed from the front surface of the switchboard without disassembling a part of the structure, and the work time and the power failure time can be shortened.

It is a perspective view which shows the circuit breaker main body and the drawer | drawing-out frame body which are included in the circuit breaker for retrofits by embodiment of this invention. It is a top view which shows the 1st attachment of FIG. It is a perspective view which shows the guide rail unit contained in the circuit breaker for retrofits by embodiment of this invention. It is a top view which shows the 2nd attachment of FIG. It is a side view which shows the 2nd attachment of FIG. It is explanatory drawing which shows the switchboard repair method using the circuit breaker for retrofits of FIGS. It is explanatory drawing which shows the switchboard repair method using the conventional circuit breaker for retrofits.

  FIG. 1 is a perspective view showing a circuit breaker body 1 and a drawer frame 2 included in a circuit breaker for retrofit according to an embodiment of the present invention. FIG. 2 is a plan view showing a first attachment 3 in FIG. is there. In FIG. 1, a circuit breaker body 1 is attached to a switchboard instead of an existing circuit breaker (old circuit breaker), and is placed on a drawer frame 2 having a plurality of wheels 20 at the bottom. That is, the circuit breaker body 1 is movable forward and backward by being placed on the drawer frame 2. A plurality of circuit breaker terminals 10 projecting rearward from the drawer frame 2 are provided at the rear part of the circuit breaker body 1. In addition, the rear part of the circuit breaker main body 1 is a part located in the switchboard side, when the circuit breaker main body 1 is attached to a switchboard. Hereinafter, the rear part and the rear part of each component mean the switchboard side (the back side), and the front part and the front part of each component mean the anti-distribution panel side (the near side).

  A first attachment 3 is attached to each circuit breaker terminal 10. As shown in FIG. 2, the first attachment 3 includes a pair of conductor plates 30 that are spaced apart from each other with the circuit breaker terminal 10 interposed therebetween, and a bolt 31 that fastens the conductor plate 30 to the tip of the circuit breaker terminal 10. Each. A fastening member 4 (fastening bolt) is attached to the leading end side of each conductor plate 30. In the state before the circuit breaker body 1 is attached to the switchboard as shown in FIG. 1, the fastening member 4 is temporarily fastened to the conductor plate 30. By tightening the fastening member 4, the gap 30 a between the conductor plates 30 is narrowed.

  Next, FIG. 3 is a perspective view showing the guide rail unit 5 included in the retrofit circuit breaker according to the embodiment of the present invention. The guide rail unit 5 shown in FIG. 3 is installed in the switchboard before the circuit breaker body 1 after the old circuit breaker is removed from the switchboard. The guide rail unit 5 includes a pair of guide rails 50, a pair of column members 51, a pair of connecting members 52, a bottom plate 53, and an insulating plate 54. The guide rail 50 is a longitudinal L-shaped member that is spaced apart from each other. The column member 51 is a longitudinal L-shaped member erected from the rear portion of each guide rail 50. The connecting member 52 is a flat plate member that connects the upper portion of the column member 51 and the front portion of the guide rail 50. The bottom plate 53 is a plate-like member that connects between the guide rails 50. The insulating plate 54 is a plate-like member made of an insulator that connects the column members 51. That is, the guide rail unit 5 is a frame-like body configured such that the breaker body 1 is inserted from the front when the breaker body 1 is attached to the switchboard. The guide rail unit 5 is assembled in advance at a factory or the like.

  A longitudinal guide member 50 a is attached to the upper portion of each guide rail 50. The wheel 20 enters between the bottom 50b of the guide rail 50 and the guide member 50a when the circuit breaker body 1 is attached to the switchboard. That is, the guide rail 50 guides the circuit breaker body 1 to move back and forth when the circuit breaker body 1 is attached to the switchboard. A wheel stopper 50c is attached to the front portion of the guide member 50a. The wheel stopper 50 c is for restricting the forward / backward movement of the circuit breaker body 1 after the circuit breaker body 1 is inserted into the guide rail unit 5 from the front of the guide rail unit 5.

  A mounting hole 53 a is provided in the bottom 50 b and the bottom plate 53 of the guide rail 50. The mounting hole 53a is disposed at a position that matches the installation hole of the old circuit breaker. After the guide rail unit 5 is disposed in the switchboard, the guide rail unit 5 is fixed in the switchboard by attaching bolts to the mounting holes 53a.

  A plurality of insertion holes 54a are formed in the insulating plate 54, and the second attachment 6 is inserted into each insertion hole 54a. The second attachment 6 is a conductor that relays between the circuit breaker body 1 and the switchboard together with the first attachment 3 described above, and is fixed to the insulating plate 54 by a mounting bolt 7 from the front.

  Next, FIG. 4 is a plan view showing the second attachment 6 of FIG. 3, and FIG. 5 is a side view showing the second attachment 6 of FIG. As shown in FIGS. 4 and 5, the second attachment 6 is provided with a first connection piece 60, an attachment body 61, and a second connection piece 62.

  The 1st connection piece 60 is a tongue piece body which protruded from the end of the attachment main body 61, and was extended along the width direction of the attachment main body 61, and is connected to the bus bar 8 of a switchboard. The bus bar 8 includes a pair of conductor plates arranged apart from each other, and the first connection piece 60 is inserted between the conductor plates and fastened to the conductor plates (bus bar 8) by bolts and nuts. .

  The attachment main body 61 is a plate-like body that is positioned behind the insulating plate 54 when the above-described guide rail unit 5 is disposed in the switchboard. The attachment main body 61 is provided with a plurality of screw holes to which the mounting bolts 7 are attached through the insulating plate 54.

  The second connection piece 62 is a tongue piece that protrudes from the other end of the attachment main body 61 and extends along the height direction of the attachment main body 61. The above-described guide rail unit 5 is disposed in the switchboard. This is a portion that is inserted through the insertion hole 54a of the insulating plate 54 when the insulation plate 54 is inserted. The second connection piece 62 has a plurality of U-shaped notches 62a. When the circuit breaker body 1 is inserted into the guide rail unit 5, the fastening member 4 is inserted into these notches 62 a. By tightening the fastening member 4 after the fastening member 4 is inserted into the notch 62a, the second connection piece 62 is sandwiched by the conductor plate 30 of the first attachment 3, and the first attachment 3 and the second attachment The attachment 6 is connected to each other.

  Next, the switchboard repair method using the retrofit circuit breaker as described above will be described. FIG. 6 is an explanatory view showing a switchboard repair method using the retrofit circuit breaker of FIGS. When renewing the circuit breaker in the existing switchboard, first remove the old circuit breaker from the switchboard, then insert the first connection piece 60 of the second attachment 6 into the bus bar 8 and fasten it with bolts and nuts. Thus, the second attachment 6 is connected to the bus bar 8 (step S1).

  Next, the guide rail unit 5 is disposed in the switchboard while the second connection piece 62 of the second attachment 6 is inserted through the insertion hole 54a of the insulating plate 54 (step S2). Next, the second attachment 6 is fixed to the insulating plate 54 from the front of the insulating plate 54 with the mounting bolt 7 (step S3), and the guide rail unit 5 is fixed by mounting the bolt in the mounting hole 53a (step S4). ).

  Next, the wheel breaker body 1 is moved from the front of the guide rail unit 5 into the guide rail unit 5 together with the drawer frame 2 from the front of the guide rail unit 5 while the wheel 20 enters between the bottom 50b of the guide rail 50 and the guide member 50a. Insert (step S5).

  At this time, the guide rail 50 guides the circuit breaker body 1 to move back and forth, so that the second connection piece 62 of the second attachment 6 enters between the conductor plates 30 of the first attachment 3 and the fastening member. 4 is inserted into the notch 62 a of the second attachment 6. In this state, for example, a fastening tool such as a ratchet is entered from the front surface of the circuit breaker body 1 through the upper part of the circuit breaker body 1 or the side part of the drawer frame 2 to perform final tightening of the tightening member 4 ( Step S6). By performing this final tightening, the conductor plate 30 of the first attachment 3 sandwiches the second connection piece 62 of the second attachment 6, and the first attachment 3 and the second attachment 6 are connected to each other. That is, the circuit breaker terminal 10 of the circuit breaker body 1 and the bus bar 8 are relayed by the first and second attachments 3 and 6. Finally, a wheel stopper 50c is attached to the front portion of the guide rail 50 to restrict the front-rear movement of the circuit breaker body 1 (step S7).

  In such a retrofit circuit breaker and a switchboard repair method using the circuit breaker, the circuit breaker body 1 is inserted into the guide rail unit 5 so that the fastening member 4 inserted into the notch 62a is finally tightened. Since the circuit breaker body 1 is connected to the bus bar 8 instead of the existing circuit breaker, the connection work can be performed if a tightening tool and hand are inserted in the back of the panel even in a narrow space from the front of the switchboard. Can be done from the front. Thereby, the replacement work can be easily performed from the front surface of the switchboard without disassembling a part of the structure, and the work time and the power failure time can be shortened. Moreover, since only the guide rail unit 5 and the second attachment 6 assembled in advance are attached to the switchboard, it is lightweight and can take a wide working space, and is excellent in workability. Further, since the guide rail unit 5 guides the circuit breaker body 1 to move back and forth, the insertion of the circuit breaker body 1 into the guide rail unit 5 allows the fastening member 4 to be reliably inserted through the notch 62a, thereby improving workability. Excellent.

  In addition, the first attachment 3 includes a pair of conductor plates 30 that are disposed apart from each other with the breaker terminal 10 interposed therebetween, and the fastening member 4 is temporarily tightened. Since the main body 1 is inserted between the conductor plates 30 when inserted into the guide rail unit 5 and includes the second connection piece 62 in which the notch 62a is formed, it can be more reliably viewed from the front of the switchboard. Replacement work can be easily performed, and work time and power failure time can be more reliably reduced.

  Furthermore, since the breaker body 1 is inserted into the guide rail unit 5 in a state where it is placed on the drawer frame 2 having a plurality of wheels 20, it can be easily transported, moved and carried into the panel. Time and power outage time can be reduced more reliably.

  In the embodiment, it has been described that the circuit breaker body 1 is mounted on the drawer frame 2 as a retrofit circuit breaker. However, depending on the configuration of the circuit breaker body, the circuit breaker body alone may be inserted into the guide rail unit. .

DESCRIPTION OF SYMBOLS 1 Circuit breaker main body 10 Circuit breaker terminal 2 Drawer frame 20 Wheel 3 1st attachment 30 Conductor plate 4 Tightening member 5 Guide rail unit 54 Insulation plate 54a Insertion hole 6 2nd attachment 62 2nd connection piece 62a Notch 8 Bus bar

Claims (4)

A circuit breaker body provided with a circuit breaker terminal at the rear;
A first attachment attached to the circuit breaker terminal;
A guide rail unit that is configured so that the breaker body is inserted from the front and provided with an insulating plate at the rear, and
A second attachment relaying between the circuit breaker terminal and a bus bar of the switchboard together with the first attachment, the second attachment being provided so as to be inserted through an insertion hole formed in the insulating plate,
A notch is formed in one of the first and second attachment terminals, and a fastening member is temporarily fastened to the other of the first and second attachment terminals,
After removing the existing circuit breaker from the switchboard, the second attachment is connected to the busbar of the switchboard, and the guide rail unit is disposed in the switchboard while inserting the second attachment through the insertion hole. The circuit breaker body is connected to the bus bar in place of the existing circuit breaker by fully tightening the fastening member inserted into the notch by inserting the circuit breaker body into the guide rail unit. A circuit breaker for retrofit, which is configured as described above. The first attachment includes a pair of conductor plates that are spaced apart from each other with the breaker terminal interposed therebetween, and the fastening member is temporarily fastened.
The second attachment includes a connection piece that is inserted between the conductor plates when the breaker body is inserted into the guide rail unit and in which the notch is formed. The circuit breaker for retrofit according to 1.   The apparatus further comprises a drawer frame having a plurality of wheels at the bottom and on which the circuit breaker body is placed, and the circuit breaker body mounted on the drawer frame is inserted into the guide rail unit. The circuit breaker for retrofits according to claim 1 or 2. A circuit breaker body provided with a circuit breaker terminal at the rear, a first attachment attached to the circuit breaker terminal, and the circuit breaker body inserted from the front and an insulating plate provided at the rear A guide rail unit; and a second attachment relaying between the breaker terminal and a bus bar of the switchboard together with the first attachment, the second attachment being provided so as to be able to be inserted into an insertion hole formed in the insulating plate. And a switchboard repair method using a retrofit circuit breaker in which a notch is formed in one of the second attachment terminal and a fastening member is temporarily fastened to the other of the first and second attachment terminals. And
After removing the existing circuit breaker from the switchboard, the second attachment is connected to the busbar of the switchboard, and the guide rail unit is disposed in the switchboard while inserting the second attachment through the insertion hole. The circuit breaker body is connected to the bus bar in place of the existing circuit breaker by fully tightening the fastening member inserted into the notch by inserting the circuit breaker body into the guide rail unit. A switchboard repair method characterized by that.

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