JP2004236453A - Switchboard, and power receiving and distributing equipment using switchboard - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a switchboard wherein power can be split and supplied from sound power receiving and distributing units to a load, corresponding to a faulty power receiving and distributing unit, that is, "split load remedy" can be implemented. <P>SOLUTION: A plurality of molded case circuit breakers are classified into two or more groups. The grouped molded case circuit breakers 3B11, 3B11 to 3B12, 3B12 and so on are respectively connected to split common bus bar conductors 3B31 and 3B32 installed on the primary side. The adjacent split common bus bar conductors 3B31 and 3B32 are connected with each other by a bus bar connecting conductor 3B4. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
[Industrial applications]
The present invention relates to a switchboard provided in an electric room of a building such as a building, an apartment, and the like, and to a power receiving and distributing facility using the switchboard.
[0002]
[Prior art]
An electric room of a building such as a building or a condominium houses a power receiving and distributing facility, from which power is supplied to each floor and power is supplied to a light load and the like.
[0003]
FIG. 4 is a single-line diagram of conventional power receiving and distribution equipment. As shown in the figure, the power receiving and distributing facility 1 'includes, for example, five power receiving and distributing units 2', 3 ', 4', 5 ', and 6'. Each power receiving / distributing unit is connected to a high-voltage service line 7 drawn into the building, and includes a voltage transforming unit 2a, 3a, 4a, 5a, 6a and a switchboard 2b, 3b, 4b, 5b, 6b. The transformer unit 2a is a switch with fuse 2a1 and a transformer for distribution 2a2, the transformer unit 3a is a switch with fuse 3a1 and a transformer for distribution 3a2, and the transformer unit 4a is a switch with fuse 4a1 and a transformer for distribution 4a2, a transformer unit. 5a includes a switch 5a1 with a fuse and a distribution transformer 5a2, and the transformer unit 6a includes a switch 6a1 with a fuse and a distribution transformer 6a2. The switchboards 2b, 3b, 4b, 5b, 6b are composed of a plurality of circuit breakers 2b1, 2b1, ..., 3b1, 3b1, ..., 4b1, 4b1, ..., 5b1, 5b1, ..., 6b1, 6b1 ..., and a common bus conductor 2b2. 3b2, 4b2, 5b2, and 6b2.
[0004]
In the above-mentioned switchboard, a plurality of wiring breakers are mounted on a mounting plate fixed in the housing, and a three-phase common bus conductor connected to the power distribution transformer shown in FIG. 4 is provided in the housing. The primary sides of all the circuit breakers are connected by a common bus conductor and three-phase branch conductors, respectively (for example, see Patent Document 1).
[0005]
[Patent Document 1]
JP-A-6-52304
[Problems to be solved by the invention]
By the way, in the power receiving and distribution equipment using the conventional power distribution panel, for example, when the power distribution transformer 2a2 of the voltage transforming unit 2a constituting the power receiving and distribution unit 2 'fails and power cannot be supplied, the power receiving and distribution unit 2' Since it is necessary to supply power to the load connected to the power supply unit, power is supplied from one of the other sound power receiving and distribution units 3 ′ and 6 ′, that is, collective load relief is performed. At the time of load rescue, a non-illustrated load rescue unit is used to connect another sound power receiving and distribution unit, for example, the low voltage side of the power distribution transformer 3a2 of the power receiving and distribution unit 3 'and the common bus conductor 2b2 of the power distribution panel 2b of the failed power receiving and distribution unit 2'. By connecting with a cable, power is supplied from the power receiving / distributing unit 2 'even though the power receiving / distributing unit 2' is out of order.
[0007]
However, each capacity of the power distribution transformers 2a2, 3a2, 4a2, 5a2, 6a2 of the transformer units constituting the power receiving / distributing units 2 ', 3', 4 ', 5', 6 'is set so as to be able to cope with the load relief. Although the capacity is almost doubled in consideration of the load factor of 100%, doubling the capacity in this way causes a problem in that the cost of the power receiving and distribution equipment is increased, and also increases in proportion to the number of power receiving and distribution units. There is a problem that the cost increase of the whole power receiving and distribution equipment is proportional.
[0008]
An object of the present invention is to provide a power distribution panel capable of dividing a healthy power receiving and distributing unit into loads corresponding to a failed power receiving and distributing unit to supply power, that is, relieving a divided load.
[0009]
Another object of the present invention is to provide a power receiving / distributing facility using a power distribution panel capable of dividing a healthy power receiving / distributing unit into loads corresponding to a failed power receiving / distributing unit and supplying power, that is, a divided load rescue unit. .
[0010]
[Means for Solving the Problems]
According to a first aspect of the present invention, the distribution board is divided into a plurality of circuit breakers in two or more groups, and a primary side of the divided circuit breakers is provided corresponding to the group. Each divided common bus conductor is connected to a common bus conductor, and adjacent divided common bus conductors are connected by a bus connection conductor.
[0011]
According to the first aspect of the present invention, since the divided common bus conductor is employed, the power is divided from a sound power receiving / distributing unit or a rescue power supply to a load corresponding to the failed power receiving / distributing unit, and power is supplied, that is, the divided load is relieved. Corresponding.
[0012]
The invention according to claim 2 is directed to a power receiving and distribution facility including a transformer unit and a power distribution panel in three or more power receiving and distribution units, respectively, and a plurality of wiring breakers provided in the power distribution panel in two or more groups. The primary sides of the circuit breakers divided into groups are respectively connected to divided common bus conductors provided corresponding to the groups, and usually, the adjacent divided common bus conductors are connected by bus connection conductors. Power is supplied from each power receiving and distributing unit to the load corresponding to each power receiving and distributing unit, and at the time of load rescue, the bus connecting conductor provided on the switchboard of the failed power receiving and distributing unit is separated from the divided common bus conductor and separated. The divided common bus conductor is electrically connected to another power receiving and distributing unit so as to supply power from the other power receiving and distributing unit to a load corresponding to the failed power receiving and distributing unit.
[0013]
According to the second aspect of the present invention, by employing the divided common bus conductor, power can be divided and supplied from a healthy power receiving and distributing unit to a load corresponding to a failed power receiving and distributing unit, that is, divided load relief can be performed. The capacity of each of the power distribution transformers of the transformer unit that constitutes the power receiving and distribution unit can be reduced.
[0014]
The invention according to claim 3 is directed to a power receiving and distributing facility having a transformer unit and a switchboard in each of two power receiving and distributing units, and divides a plurality of circuit breakers provided in the switchboard into two or more groups. , The primary sides of the grouped circuit breakers are respectively connected to divided common bus conductors provided corresponding to the group, and the adjacent divided common bus conductors are normally connected by bus connection conductors in normal times. Power is supplied from each power receiving and distributing unit to the load corresponding to each power receiving and distributing unit, and at the time of load rescue, the split common bus conductors connected by the bus connecting conductor provided on the switchboard of the failed power receiving and distributing unit are separated, A selected divided common bus conductor of the separated divided common bus conductors is electrically connected to a rescue power supply to supply power from the rescue power supply to a load corresponding to the failed power receiving and distribution unit. It is obtained by way.
[0015]
According to the third aspect of the present invention, since the divided common bus conductor is selected by employing the divided common bus conductor, the power is divided from the rescue power supply to a part of the load corresponding to the failed power receiving and distribution unit, In other words, the divided load can be relieved, and the capacity of each of the power distribution transformers of the transformer unit constituting the power receiving and distribution unit can be reduced.
[0016]
According to a fourth aspect of the present invention, the number of groups is a value obtained by subtracting 1 from the number of power receiving and distribution units.
[0017]
According to the fourth aspect of the present invention, since the value is obtained by subtracting 1 from the number of power receiving and distributing units, each capacity reduction of the power distribution transformer of the transformer unit constituting the power receiving and distributing unit is maximized.
[0018]
According to a fifth aspect of the present invention, the bus connection conductor is reconnected at the time of load relief so as to protrude from a housing that houses the circuit breaker provided on the switchboard.
[0019]
In the invention described in claim 5, the load rescue cable is easily connected by connecting the busbar connection conductor so as to protrude from the housing.
[0020]
According to a sixth aspect of the present invention, there is provided a conductor connection bolt through hole for connecting the busbar connection conductor to the divided common busbar conductor by bolts, and the conductor connection bolt throughhole is used for load relief at the time of load relief. This is also used for connecting cables.
[0021]
In the invention according to claim 6, the number of through holes is reduced by using the conductor connection bolt through holes for connection of the load rescue cable.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a single-line diagram of power receiving and distribution equipment using the switchboard according to the present invention. 2A and 2B are schematic configuration diagrams showing one embodiment of a switchboard according to the present invention, in which FIG. 2A is a top view and FIG. 2B is a front view. In FIG. 1, similarly to FIG. 4, the power receiving and distributing facility 1 includes five power receiving and distributing units 2, 3, 4, 5, and 6, and is connected to the high-voltage service lines 7, respectively. , 5A, 6A and switchboards 2B, 3B, 4B, 5B, 6B. The transformer unit 2A is a switch 2A1 with a fuse and a transformer 2A2 for distribution. The transformer unit 3A is a switch 3A1 with a fuse and a transformer 3A2 for distribution. The transformer unit 4A is a switch 4A1 with a fuse and a transformer 4A2 for a transformer. 5A includes a switch 5A1 with a fuse and a power distribution transformer 5A2, and the transformer unit 6A includes a switch 6A1 with a fuse and a power transformer 6A2. One of the switchboards,
For example, as shown in FIG. 2, the switchboard 3B includes a housing 3B2 in which a first group of circuit breakers 3B11, 3B11... And a second group of circuit breakers 3B12, 3B12. The three-phase first divided common bus conductors 3B31, 3B31, 3B31 and the three-phase second divided common bus conductors 3B32, 3B32, 3B32 are attached to a mounting plate (not shown) fixed therein. Are provided in the housing 3B2. The primary sides of the circuit breakers 3B11, 3B11,... Are respectively connected to the first divided common bus conductors 3B31, 3B31, 3B31, and the primary sides of the circuit breakers 3B12, 3B12,. They are connected to bus conductors 3B32, 3B32, 3B32, respectively. At the upper end of the first divided common bus conductors 3B31, 3B31, B31, three-phase pull-in cables 8, 8, 8 (only one phase is shown) from the distribution transformer 3A2 are connected, and Each of the secondary sides of the circuit breakers 3B11, 3B11... And the second group of circuit breakers 3B12, 3B12.
[0023]
Normally, as shown in FIG. 3A, the first divided common bus conductors 3B31, 3B31, 3B31 (only one phase is shown) and the second divided common bus conductors 3B32, 3B32, 3B32 (one phase common bus conductor). ) Are connected, for example, by bolts (not shown), for example, in plate-like three-phase bus connection conductors 3B4, 3B4, 3B4 (only one phase is shown).
[0024]
At the time of load relief, for example, when the power receiving and distribution unit 3 fails, as shown in FIG. 3B, the bus connection conductor 3B4 is cut off from the first divided common bus conductor 3B31 and protrudes from the housing 3B2. To the second divided common bus conductor 3B32. The lead-in cable 8 shown in FIG. 2B is disconnected from the upper end of the first divided common bus conductor 3B31. Thereafter, one end of each of the three-phase load rescue cables 10, 10, 10 (only one phase is displayed) is connected to these bus connection conductors 3B4, 3B4, 3B4 (only one phase is displayed) by, for example, bolts (not shown). The other end is connected to another healthy power receiving and distribution unit, for example, the low voltage side of the power distribution transformer 2A2 of the power receiving and distribution unit 2. One end of a load relief cable (not shown) is connected to the upper end of the first divided common bus conductor 3B31 to which the lead-in cable 8 is connected, and the other end is connected to another sound power receiving and distribution unit, for example, a power receiving and distribution unit. 4 is connected to the low voltage side of the power distribution transformer 4A2 so that power is supplied from the power receiving and distribution unit 3 even though the power receiving and distribution unit 3 is out of order. In this manner, power can be divided into loads on the power receiving and distribution unit 3 via the first group of circuit breakers 3B11, 3B11,... And the second group of circuit breakers 3B12, 3B12,. It has become.
[0025]
As shown in FIG. 2B, a divided common bus conductor connecting bolt for tightening and connecting with, for example, a bolt (not shown) is connected to the first divided common bus conductor 3B31 and the second divided common bus conductor 3B32. For example, two and four through holes 3B30 are provided, respectively, and the bus connection conductor 3B4 is connected to the divided common bus conductors 3B31 and 3B32 at normal times as shown in FIGS. 3A and 3B. In order to connect with the divided common bus conductor 3B32 and the load rescue cables 10, 10, 10 (only one phase is shown) at the time of load rescue, for example, a divided common bus / cable for tightening and connecting with bolts (not shown) For example, ten conductor connection bolt through holes 3B40 are provided, and the divided common bus / cable conductor connection bolt through holes 3B40 are provided with load rescue cables. It is also used to connect the table 10, 10, 10 (only one phase).
[0026]
In the above description, each load on each power receiving / distributing unit has the same capacity, and a plurality of circuit breakers are divided into two groups by the same number. , The capacity of each of the power distribution transformers 2A2, 3A2, 4A2, 5A2, 6A2 of the transformer units 2A, 3A, 4A, 5A, 6A is conventionally doubled, but may be 1.5 times. .
[0027]
Further, when each load on each power receiving and distribution unit has the same capacity, and a plurality of circuit breakers are divided into three groups with the same number, the transformers constituting the power receiving and distribution units 2, 3, 4, 5, and 6 are formed. Each capacity of the distribution transformers 2A2, 3A2, 4A2, 5A2, 6A2 of the unit will be 1.33 times, and furthermore, if the wiring breakers are divided into four groups as described above, Each capacity of the power distribution transformers 2A2, 3A2, 4A2, 5A2, 6A2 of the transformer units constituting the power receiving / distributing units 2, 3, 4, 5, 6 is only required to be 1.25 times. Thus, the capacity can be reduced.
[0028]
As described above, when the wiring breakers are divided into four groups for five power receiving and distribution units, one is subtracted from the number of power receiving and distribution units 5, and the power receiving and distribution units 2, 3, 4, The capacity reduction of each of the power distribution transformers 2A2, 3A2, 4A2, 5A2, and 6A2 of the transformer units constituting 5, 6 is maximized. By the way, when it is not possible to divide the circuit breakers to maximize the reduction of each capacity of the distribution transformer due to the restrictions of the structure of the switchboard, the structure of the electric room, etc., the circuit breakers are divided into two or three groups. Become.
[0029]
In the above embodiment, the number of power receiving and distribution units is three or more. However, when the number of power receiving and distribution units is two, when a load is relieved, a selected divided common bus conductor of the divided common bus conductors, for example, an important load is The connected divided common bus conductor may be electrically connected to a rescue power supply, for example, a mobile substation, and power may be supplied from the rescue power supply. Also in this case, the capacity of the power receiving / distributing unit can be reduced according to the method of dividing the circuit breaker for wiring.
[0030]
In the above-described embodiment, the bus connection conductor 3B4 is reconnected so as to protrude from the housing 3B2 at the time of load relief, but does not protrude from the housing 2 as shown in FIG. The connection may be reconnected.
[0031]
In the above embodiment, the divided common bus / cable conductor connection bolt through hole 3B40 provided in the bus connection conductor 3B4 is also used for connection of the load rescue cable 10, but may not be used. Alternatively, a through hole dedicated to the connection terminal of the load rescue cable may be separately provided in this busbar connection conductor.
[0032]
Further, in the above embodiment, power is supplied from another sound power receiving and distribution unit at the time of load rescue, but power is supplied from a rescue power supply, for example, a mobile substation instead of the power receiving and distributing unit. You may. Further, at the time of load rescue, power is supplied from other sound power receiving and distribution units via all divided common bus conductors, but selected divided common bus conductors among the divided common bus conductors, for example, important The power may be supplied via the divided common bus conductor to which the various loads are connected. In this case, in addition to the capacity reduction as described above, the capacity of the power receiving and distributing unit can be further reduced according to the method of dividing the circuit breaker.
[0033]
【The invention's effect】
As described above, according to the first aspect of the present invention, by employing the divided common bus conductor, the power is divided from a sound power receiving / distributing unit or a rescue power supply to a load corresponding to the failed power receiving / distributing unit. In other words, since it is possible to cope with the divided load relief, it is possible to reduce the cost of the power receiving and distribution equipment using this switchboard.
[0034]
According to the second aspect of the present invention, by employing the divided common bus conductor, power can be divided and supplied from a healthy power receiving and distributing unit to a load corresponding to a failed power receiving and distributing unit, that is, divided load relief can be performed. Since each capacity of the power distribution transformer of the transformer unit constituting the power receiving / distributing unit can be reduced, the cost of the power receiving / distributing equipment can be reduced.
[0035]
According to the third aspect of the present invention, since the divided common bus conductor is selected by using the divided common bus conductor, the power is divided from the rescue power supply to a part of the load corresponding to the failed power receiving and distributing unit. In other words, since the divided load can be relieved and the capacity of the power distribution transformer of the transformer unit constituting the power distribution unit can be reduced, the cost of the power distribution equipment can be reduced.
[0036]
According to the invention described in claim 4, since the value obtained by subtracting 1 from the number of the power receiving and distributing units is set, each capacity reduction of the power distribution transformer of the transformer unit constituting the power receiving and distributing unit is maximized. The cost of the power receiving and distribution equipment can be reduced to the maximum.
[0037]
According to the fifth aspect of the present invention, since the bus connecting conductor is connected so as to protrude from the housing, the load rescue cable is easily connected, so that the load rescue operation can be simplified.
[0038]
According to the sixth aspect of the present invention, since the conductor connection bolt through-hole is also used for connection of the load rescue cable, the number of through-holes is reduced, so that the boring operation can be simplified.
[Brief description of the drawings]
FIG. 1 is a single-line diagram of power receiving and distribution equipment using a switchboard according to the present invention.
FIG. 2 is a schematic configuration diagram showing one embodiment of a switchboard according to the present invention, wherein (A) is a top view and (B) is a front view.
FIG. 3A is a detailed view showing a connection state of a bus connection conductor in a normal state, and FIG. 3B is a detail view showing a connection state of a bus connection conductor in a load relief mode.
FIG. 4 is a single-line diagram of a conventional power receiving and distribution facility.
[Explanation of symbols]
1 Power receiving and distribution equipment 2, 3, 4, 5, 6 Power receiving and distribution units 2A, 3A, 4A, 5A, 6A Transformation units 2B, 3B, 4B, 5B, 6B Power distribution boards 2B11, 3B11, 4B11, 5B11, 6B11 Wiring circuit breakers 2B12, 3B12, 4B12, 5B12, 6B12 Second group of circuit breakers 2B31, 3B31, 4B31, 5B31, 6B31 First divided common bus conductors 2B32, 3B32, 4B32, 5B32, 6B32 Second divided Common bus conductor 2B4, 3B4, 4B4, 5B4, 6B4 Bus connection conductor

Claims (6)

A plurality of circuit breakers are divided into two or more groups, and the primary sides of the circuit breakers divided into the group are connected to divided common bus conductors provided corresponding to the groups, respectively. A switchboard configured by connecting the divided common bus conductors by a bus connection conductor. In a power receiving and distribution facility provided with a transformer unit and a switchboard in each of three or more power receiving and distribution units,
A plurality of wiring breakers provided on the switchboard are divided into two or more groups, and a divided common bus conductor in which the primary side of the wiring breakers divided into the group is provided corresponding to the group; Connected to
Normally, power is supplied from each power receiving / distributing unit connected between adjacent divided common bus conductors by a bus connecting conductor to a load corresponding to each power receiving / distributing unit,
At the time of load relief, the divided common bus conductors connected by the bus connection conductors provided on the switchboard of the failed power receiving and distribution unit are separated from each other, and the separated divided common bus conductor is electrically connected to another power receiving and distribution unit. Power receiving and distribution equipment connected to the power receiving and supplying power from the other power receiving and distributing unit to a load corresponding to the failed power receiving and distributing unit. In a power receiving and distribution facility equipped with a transformer unit and a switchboard in each of two power receiving and distribution units,
A plurality of wiring breakers provided on the switchboard are divided into two or more groups, and a divided common bus conductor in which the primary side of the wiring breakers divided into the group is provided corresponding to the group; Connected to
Normally, power is supplied from each power receiving / distributing unit connected between adjacent divided common bus conductors by a bus connecting conductor to a load corresponding to each power receiving / distributing unit,
At the time of load relief, the divided common bus conductors connected by the bus connection conductor provided on the switchboard of the failed power receiving and distribution unit are separated from each other, and a selected divided common bus of the separated divided common bus conductors is separated. A power receiving and distribution facility in which a conductor is electrically connected to a power supply for rescue and supplies power from the power for rescue to a load corresponding to the failed power receiving and distributing unit. The power receiving and distribution facility according to claim 2, wherein the number of the groups is a value obtained by subtracting 1 from the number of the power receiving and distributing units. 5. The power receiving and distribution facility according to claim 2, wherein the bus connection conductor is reconnected at the time of load relief so as to protrude from a housing that houses the circuit breaker provided on the power distribution panel. 6. The bus connection conductor is provided with a conductor connection bolt through-hole for fastening and connecting to the divided common bus conductor with a bolt, and the conductor connection bolt through-hole is also used for connection of a load rescue cable during load rescue. The power receiving and distribution facility according to any one of claims 2 to 5.

Images