JP5289169B2 - Single-phase three-wire distribution board - Google Patents

Description

  The present invention relates to a single-phase three-wire distribution board capable of performing branch wiring with different rated voltages without using a switch with protection against neutral phase loss.

  The conventional single-phase three-wire distribution board has an unbalanced voltage due to the difference in impedance (resistance) connected to the load side when the neutral wire is broken due to disconnection or loosening of the connection, etc. There is a risk that a voltage exceeding the normal value will be applied to the product, resulting in electrical equipment insulation deterioration and burnout accidents. In order to prevent this, it is necessary to use a switch equipped with a switch with neutral phase loss protection that can detect and shut off the signal when there is an abnormality in the neutral wire (for example, patent document) 1).

However, even in a single-phase three-wire distribution board installed at a location where the number of load wirings is small, such as for temporary installation or construction site, it is necessary to provide the above-described switch with neutral phase loss protection.
However, the switch with neutral phase loss protection is expensive, and there is a problem that the distribution board itself is enlarged despite the fact that the load wiring is small.

  In addition, to prevent voltage imbalance without using a switch with neutral phase loss protection, a distribution board consisting of only a single-phase two-wire branch circuit that connects all loads to the same phase However, since this is exclusive for the 100V circuit or 200V circuit and cannot be used together, it is necessary to prepare one more distribution board when using both circuits.

Utility Model Registration No. 2570908

  In the present invention, when a neutral wire is phase-opened without using a switch equipped with a neutral wire phase-opening protection, a voltage exceeding the normal value is applied to the load-side circuit of the 100 V circuit, resulting in insulation deterioration and burnout of electrical equipment. Provided is a single-phase three-wire distribution board that does not cause an accident and can perform 200V wiring with different rated voltages.

In the single-phase three-wire distribution board according to the present invention, the bus connected to the branch switch in the single-phase three-wire distribution board is connected to the two power supply bus lines to which voltage is applied and one neutral that is not subjected to voltage. As a common power supply bus, which is composed of a bus, and forms one 100V circuit and 200V circuit with one of the two power supply buses by the neutral bus and the other power supply bus, respectively. It consists of a 100V circuit formed by only a common power supply bus and a neutral bus, and a 200V circuit formed by a common power supply bus and another power supply bus .

In addition, the branch switch is a plug-in type switch, the bus bars are arranged in three stages at intervals in the vertical direction, and the neutral bus line and the other one power supply bus do not overlap each other in the vertical direction. The common power source bus is arranged in the short direction of the branch switch so as to correspond to both the neutral bus and the other one power source bus. It is the structure . Further, it is preferable that the other one power source bus and the neutral bus are constituted by a plate-shaped bus bar having a shape that can be used together.

  The single-phase three-wire distribution board according to the present invention is configured such that one of the two power supply buses to which a voltage is applied is connected to the branch switch, one of the power supply buses is a neutral bus and the other power supply. A common power supply bus forming a 100 V circuit and a 200 V circuit with the bus, respectively. As a result, since one 100V circuit is formed by only the common power supply bus and the neutral bus, even if the neutral wire is lost, the load-side electric circuit can be used without using a switch with neutral wire open phase protection. In this case, the voltage exceeding the normal value is not applied to the insulation, causing the insulation deterioration of the electrical equipment and the burning accident. Further, a 200V circuit having a different rated voltage can be formed by the common power supply bus and another power supply bus.

Also, those power bus and neutral bus before Symbol other one is that by a plate-like busbar of possible combination shape, it is possible to lower the cost of the production and inventory management of the plate-like busbar It is. Further, the branch switch is added to the branch switch from a branch switchgear plug-in, but easily replaceable.

The perspective view which shows 1st Embodiment. The front view which shows 1st Embodiment. The perspective view which shows 1st Embodiment except a branch switch. The perspective view which shows the relationship between a terminal block, a power supply bus line, and a neutral bus line except a branch switch for 1st Embodiment. The perspective view which shows 2nd Embodiment except a branch switch. The perspective view which shows the relationship between a terminal block, a power supply bus line, and a neutral bus line except a branch switch for 2nd Embodiment. The perspective view which shows the plate-shaped bus-bar which can be used together with the other power-supply bus used for 2nd Embodiment, and a neutral bus.

Next, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
First, the first embodiment shown in FIGS. 1 to 4 will be described.
In FIG. 1, reference numeral 1 denotes a box body of a single-phase three-wire distribution board according to the present invention. The box body 1 opens and closes a front opening 1a by a door (not shown). An electric wire hole 11 a for drawing a single-phase three-wire electric wire is provided in the upper part of the back surface 11 of the box body 1. Further, on the back surface 11, there are a power supply side terminal portion 21 connected to the L1 phase, N phase, and L2 phase wires drawn from the wire hole 11 a and three power supply buses 4 branched to the plurality of branch switches 3. A terminal block 2 provided with a load side terminal portion 22 to be connected is attached.

  The terminal block 2 has L1 phase connection terminals 21a and L2 phases corresponding to the power supply side terminal portion 21 corresponding to a single-phase three-wire power line (L1 phase), a neutral line (N phase), and a power line (L2 phase). The connection terminals 21c for the use are arranged on both sides of the terminal block 2 in the left-right direction, and the connection terminals 21b for the N-phase are arranged in the middle of the terminal block 2 in the left-right direction. In addition, the load side terminal portion 22 includes three power lines 4 (L1 phase) 4a and a power line bus (L2 phase) 4c, which are three bus lines 4 connected to the branch switch 3, and one voltage is not applied. L1 phase terminal 22a and L2 phase terminal 22c are arranged on both sides in the left-right direction of the terminal block 2 so as to correspond to the neutral bus (N phase) 4b, and N-phase terminal 22b in the middle of the terminal block 2 in the left-right direction. Is arranged.

  Of the two power supply buses (L1 phase) 4a and the power supply bus (L2 phase) 4c, one power supply bus (L2 phase) 4c is connected to the neutral bus (N phase) 4b and the other one. As a common power supply bus 4c that forms a 100V circuit and a 200V circuit with the power supply bus (L1 phase) 4a, respectively, a circuit formed with only the common power supply bus (L2 phase) 4c and the neutral bus (N phase) 4b, A circuit formed by a common power bus (L2 phase) 4c and another one power bus (L1 phase) 4a is formed, and among the plurality of branch switches 3, a common power bus (L2 phase) 4c Branch switch 3a connected to neutral bus (N phase) 4b for 100V load wiring, branch switch connected to common power bus (L2 phase) 4c and one other power bus (L1 phase) 4a 3b is used for 200V load wiring.

  The two power buses (L1 phase) 4a, the power bus (L2 phase) 4c, the neutral bus (N phase) 4b and the branch switch 3 are connected to each other by connecting the power buses 4a, 4c, 4b in a plate shape. The bus bars are arranged in three stages: a neutral bus (N phase) 4b, a power bus (L1 phase) 4a, and a power bus (L2 phase) 4c in order from the top with an interval in the vertical direction. The neutral bus (N phase) 4b and the other one power bus (L1 phase) 4a are arranged in the short direction of the branch switch 3 so as not to overlap each other, and the common power bus The (L2 phase) 4c is arranged in the short direction of the branch switch 3 so as to correspond to both the neutral bus (N phase) 4b and the other one power bus (L1 phase) 4a. Yes. In the figure, the upper and lower two-stage neutral bus (N phase) 4b and the power bus (L1 phase) 4a are arranged so that they do not overlap each other in the vertical direction and are separated in the horizontal direction of the terminal block 2. The lowermost power bus (L2 phase) 4c is arranged over the entire left and right direction of the terminal block 2 so as to correspond to both the neutral bus (N phase) 4b and the power bus (L1 phase) 4a.

  That is, in this embodiment, as shown in FIG. 2, FIG. 3 and FIG. 4, the power supply bus (L1 phase) 4a is bent downwardly at the distal end of the mounting plate 50 connected to the L1 phase terminal 22a. And a plate-like bus bar 5a in which a conductive bar plate portion 52 is formed in the left-right direction of the terminal block 2 and extended to the middle of the N-phase terminal 22b. Further, the neutral bus (N-phase) 4b is connected to the N-phase terminal 22b at the front end of the mounting plate 50 through an upward bent plate 51, and the N-phase terminal 22b in the left-right direction of the terminal block 2. The plate bus bar 5b is formed with a conductive bar plate portion 52 that extends from the middle of the terminal block 2 and extends to the right end of the terminal block 2 in the left-right direction. Further, the power bus (L2 phase) 4c extends to the tip of the mounting plate portion 50 connected to the L2 phase terminal 22c via a downward bent plate portion 51 and then extends to the entire left and right direction of the terminal block 2. It is assumed to be composed of a plate-shaped bus bar 5c on which a conductive bar plate portion 52 is formed. Then, a common power bus forming a circuit of 100 V and 200 V, respectively, with the neutral bus (N phase) 4b and the power bus (L1 phase) 4a positioned above the power bus (L2 phase) 4c in the lowermost stage. (L2 phase) 4c.

  The branch switch 3 includes a neutral bus (N phase) 4b, a power bus (L1 phase) 4a, and a power bus (L2) made up of plate-shaped bus bars arranged in three stages in the short direction in the short direction. Phase) The plug-in branch switch 3 is formed by forming three lateral grooves 31 corresponding to 4c and providing the lateral groove 31 with a plug-in terminal fitting 32. In the plug-in branch switch 3, the lowermost plug-in terminal fitting 32 is connected to the common power source bus (L2 phase) 4c and separated in the left-right direction of the terminal block 2 without overlapping each other as described above. Thus, either one of the two upper and lower plug-in terminal fittings 32 and 32 of the plug-in branch switch 3 is connected to the neutral bus (N phase) 4b and the power bus (L1 phase) 4a arranged in two upper and lower stages as described above. Are connected to the neutral bus (N phase) 4b to form a 100V circuit, and those connected to the power supply bus (L1 phase) 4a are to form a 200V circuit.

  Since the neutral bus (N phase) 4b and the power source bus (L1 phase) 4a are separated from each other in the left-right direction of the terminal block 2 and do not overlap each other, the plug-in branch switch 3 is By attaching to the locations corresponding to the neutral bus (N phase) 4b and the power supply bus (L1 phase) 4a, wiring of the 100V circuit and the 200V circuit can be automatically performed.

  Since the 100V circuit formed as described above is formed only in the common power supply bus (L2 phase) 4c and the neutral bus (N phase) 4b among the power supply buses to which voltage is applied, the neutral line is lost. However, a voltage exceeding the normal value is not applied to the load-side electric circuit, resulting in an insulation deterioration and a burnout accident of the electric equipment.

Further, as described above, a 200V circuit having a different rated voltage can be formed by the common power supply bus (L2 phase) 4c and another power supply bus (L1 phase) 4a. Thus, branch wiring of 100V and 200V having different rated voltages can be stably performed without using a switch with protection against neutral phase loss. Reference numeral 6 denotes a mounting base provided on the back surface of the box body 1 for mounting the plug-in type branch switch 3, and has a structure in which the plug-in type branch switch 3 can be mounted by one touch.
In addition,

[Second Embodiment]
Next, a second embodiment shown in FIGS. 5 to 7 will be described.
The second embodiment is different from the first embodiment in that a common power bus (L2 phase) 4c is formed out of two power bus (L1 phase) 4a and power bus (L2 phase) 4c. The other one of the power buses (L1 phase) 4a and the neutral bus bar (N phase) 4b is configured with plate-like bus bars 5a and 5b that can be used together.
Hereinafter, this different configuration will be mainly described, and the description of the other configuration will be referred to by attaching the same reference numerals to the first embodiment to the description of the first embodiment.

  First, three wires branching to the power supply side terminal portion 21 connected to the L1-phase, N-phase, and L2-phase wires drawn from the wire hole 11a provided in the upper portion of the back surface 11 of the box body 1 and the plurality of branch switches 3 are provided. The terminal block 2 provided with the load side terminal portion 22 connected to the power source bus 4 is configured as follows.

  That is, the terminal block 2 has the power terminal portion 21 corresponding to the single-phase three-wire power line (L1 phase), the neutral line (N phase), and the power line (L2 phase) and the L1 phase connection terminal 21a. N-phase connection terminals 21 b are arranged on both sides in the left-right direction of the terminal block 2, and L2-phase connection terminals 21 c are arranged in the middle in the left-right direction of the terminal block 2. In addition, the load side terminal portion 22 includes three power lines 4 (L1 phase) 4a and a power line bus (L2 phase) 4c, which are three bus lines 4 connected to the branch switch 3, and one voltage is not applied. The L1 phase terminal 22a and the N phase terminal 22b are arranged on both sides in the left and right direction of the terminal block 2 so as to correspond to the neutral bus (N phase) 4b of the terminal block 2, and the L2 phase terminal 22c is arranged in the middle of the terminal block 2 in the left and right direction. Is arranged.

  The two power buses (L1 phase) 4a, the power bus (L2 phase) 4c, and the neutral bus (N phase) 4b are connected to the branch switch 3 by connecting each power bus 4a, 4c, 4b to a plate shape. The bus bars are arranged in three stages, ie, a neutral bus (N phase) 4b, a power bus (L1 phase) 4a, and a power bus (L2 phase) 4c in order from the top with a space in the vertical direction.

  The upper and lower two stages of the neutral bus (N phase) 4b and the power bus (L1 phase) 4a are arranged so as not to overlap each other in the horizontal direction of the terminal block 2, and the lowermost power source The bus (L2 phase) 4c is arranged over the entire left and right direction of the terminal block 2 so as to correspond to the neutral bus (N phase) 4b and the power source bus (L1 phase) 4a, and the neutral bus (N Phase) 4b and a common power supply bus (L2 phase) 4c forming a 200V circuit with a power supply bus (L1 phase) 4a.

  Further, as described above, the upper and lower two-stage neutral bus (N phase) 4b and the power bus (L1 phase) 4a are arranged so as to be separated in the left-right direction of the terminal block 2 without overlapping each other, The neutral bus (N phase) 4b and the power source bus (L1 phase) 4a are connected to the L1 phase terminal 22a and the N phase terminal 22b arranged on both sides of the load side terminal portion 21 of the terminal block 2 in the left-right direction. To do.

  Specifically, the neutral bus (N-phase) 4b is extended to the tip of the mounting plate 50 connected to the N-phase terminal 22b via an upward bent plate 51 and the left and right sides of the terminal block 2 The power supply bus bar (L1 phase) 4a is formed of a plate-like bus bar 5b having a conductive bar plate portion 52 extending inward in the direction, and the power supply bus bar (L1 phase) 4a is connected to the L1 phase terminal 22a. It is composed of a plate-shaped bus bar 5b formed with a conductive bar plate portion 52 which is extended at the front end of the terminal block 2 through a downward bent plate portion 51 and extended inward in the left-right direction of the terminal block 2. . Further, the power bus (L2 phase) 4c has a downward bent plate portion 51 at the front end of the mounting plate portion 50 connected to the L2 phase terminal 22c and extends across the entire left and right direction of the terminal block 2 on both sides of the front end. The conductive bar plate 52 is formed of a plate-like bus bar 5c.

  As a result, the two plate-like bus bars 5b and 5a, which are the neutral bus (N phase) 4b and the power bus (L1 phase) 4a, are the same L-shaped ones as shown in FIG. Thus, the neutral bus (N phase) 4b and the power bus (L1 phase) 4a can be configured to be used in combination, and the costs for manufacturing and inventory management can be reduced.

  In any of the above-described embodiments, it is needless to say that voltages in opposite phases may be supplied to the common power supply bus (L2 phase) 4c and the other power supply bus (L1 phase) 4a. Of course, the circuit may be used at different rated voltages without being limited to the 100V circuit and the 200V circuit. Further, the neutral bus (N phase) 4b, the power bus (L1 phase) 4a, and the power bus (common bus) (L2 phase) 4c formed on the plate bus bar are not provided with the terminal block 2. It goes without saying that the power supply is directly connected to the bus support stand.

3 Branch switch 4 Bus
4a Power bus
4b Neutral bus
4c Power bus (Common power bus)
5a Plate busbar
5b Plate-shaped busbar
5c Plate-shaped busbar

Claims (2)

In the single-phase three-wire distribution board,
The bus connected to the branch switch is composed of two power supply buses with voltage and one neutral bus without voltage.
Of the two power supply buses, one power supply bus is used as a common power supply bus forming a 100 V circuit and a 200 V circuit with the neutral bus and the other one power supply bus, respectively.
A 100V circuit formed only of the common power bus and a neutral bus;
It consists of a 200V circuit formed by a common power bus and one other power bus.
And the said branch switch is a plug-in type branch switch,
The bus bars are arranged in three stages at intervals in the vertical direction,
The neutral bus and the other one power source bus are arranged in the short direction of the branch switch so as not to overlap each other vertically,
The common power supply bus is arranged in the short direction of the branch switch so as to correspond to both the neutral bus and the other power supply bus. Electric board. 2. The single-phase three-wire distribution board according to claim 1, wherein the other one power bus and neutral bus are configured by a plate-shaped bus bar having a shape that can be used together .

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