JP4136499B2 - Closed cubicle for power converter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric circuit installed on a power supply side and a load side of a power conversion device used in an electric power system, and a closed cubicle for a power conversion device that houses equipment associated with the electric circuit.
[0002]
[Prior art]
As a power converter used in the power system, for example, there is an uninterruptible power supply device mainly composed of an inverter device. The details of the present invention will be described below by taking this uninterruptible power supply as an example.
FIG. 6 is a general main circuit connection diagram of a commercial synchronous system uninterruptible power supply device synchronized with a commercial power source.
[0003]
In the conventional circuit of FIG. 6, the inverter device 1 as a power converter converts AC power from the commercial power source 2 into AC power having a constant voltage and a constant frequency. The apparatus 1 is operating in a state of being synchronized with the commercial power supply 2, and the AC power output from the inverter apparatus 1 is always supplied to a load (not shown). When this inverter device 1 breaks down or is stopped for inspection or repair, the input-side breaker 5 as a power converter switch of the inverter device 1 and also as a power converter switch By turning off the output-side breaker 6 and turning on the bypass circuit breaker 7 as a switch for the power converter, the supply source of AC power to the load through the load breaker 8 causes a power failure. The inverter device 1 can be switched to the commercial power source 2 without any change.
[0004]
Between the commercial power source 2 and the inverter device 1, there is a power receiving breaker 3 as a switch for a power conversion device, and an insulating transformer 4 is connected through this. The insulation transformer 4 transforms AC power from the commercial power source 2 into a voltage suitable for the inverter device 1 and blocks noise generated in the distribution line on the commercial power source 2 side from entering the inverter device 1.
[0005]
When the inverter device 1 is used, the above-mentioned devices are provided on the power supply side and the load side of the inverter device 1, but these devices are collectively shown in a closed cubicle 10 illustrated by a one-dot chain line. The most common configuration is to store. Reference numeral 9 denotes an external line terminal portion for connecting a power supply side electric wire, a load side electric wire or an electric wire for connecting the inverter device 1 introduced into the closed cubicle 10.
[0006]
FIG. 7 is a three-dimensional view of the conventional closed cubicle housing the conventional circuit described above with reference to FIG. 6, wherein (a) is a front view and (b) is a right side view. , (C) is a plan view, and a closed cubicle 10 described by a one-dot chain line in the conventional circuit of FIG. 6 corresponds to this. A ventilation gallery 11 is provided on both sides and the ceiling of the closed cubicle 10.
[0007]
[Problems to be solved by the invention]
In the closed cubicle 10, each of the breakers 3, 5, 6, 7, 8 described in the circuit of the prior art described in FIG. Among these, since the insulation transformer 4 uses a large amount of iron and copper, its mass is extremely large. Therefore, the closed cubicle 10 needs a structure with high strength (for example, a frame structure) so that the high-mass insulating transformer 4 can be accommodated and moved. Therefore, compared with a closed cubicle in which such a high-mass object is not stored, there is a problem that it takes time and effort to design and manufacture, resulting in high costs. Furthermore, since the capacity of the power conversion device and the configuration of the circuit to which the power conversion device is applied are not constant, it is difficult to standardize the portion of the closed cubicle 10 that houses the various breakers, and a new drawing every time. There is a bug that must be created. This is a new design of the entire closed cubicle 10 including the part that houses the insulation transformer 4, which not only increases the design and manufacturing effort, but also requires extra effort in terms of management. There is a bug. Furthermore, when the number of breakers installed increases during the production of the closed cubicle, or when a specification change such as a change in the capacity of the breaker occurs, problems such as inability to deal with these changes also occur.
[0008]
Therefore, the object of the present invention is to reduce the weight and cost of the design and production that increase in response to the increase in the number of breakers and the capacity change due to the specification change, and to reduce the weight of the cubicle that houses the high-mass insulation transformer. There is in doing so.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a closed cubicle for a power conversion device according to the present invention comprises:
An insulation transformer that insulates AC power input to the power converter, a plurality of load switches that supply the power converted by the power converter to a load, and a configuration that corresponds to the usage status of the power converter In a closed cubicle for a power conversion device in which a plurality of switches for power conversion devices that open and close input / output power of the power conversion device at an appropriate position of a circuit are housed in a closed cubicle,
A closed cubicle for a transformer that houses the insulation transformer, and a closed cubicle for a switch that houses the load switch and a switch for a power converter, and the closed cubicles are separately or integrally provided. So that it can be installed.
[0010]
The closed cubicle for transformers and the closed cubicle for switches are structured so that they can be integrated back to back.
The closed cubicle for a switch is provided with a mounting hole for attaching each switch housed in the switch on the back plate constituting the closed cubicle for the switch.
Each switch attachment hole provided in the back plate of the closed cubicle for switch is suitable for the load switch and power converter switch of various capacities, and a plurality of the switches can be attached. Provide as many mounting holes as possible.
[0011]
A separate protective cover for preventing electric shock is provided for each switch on the power supply side terminal portion and the load side terminal portion of each switch housed in the closed cubicle for the switch.
The power supply side conductor of the load switch housed in the closed cubicle for the switch has a common bus structure that can simultaneously connect the load switches, and the common bus has various capacities and a plurality of loads. A common bus that can be connected to a switch is provided.
[0012]
A suspension is installed on the ceiling of the closed cubicle for transformer, and the mass of the insulated transformer and the closed cubicle for the transformer that houses the insulation transformer, or the closed cubicle for the transformer that houses the insulated transformer and the The said suspension tool and the said insulation transformer are couple | bonded by the some connection beam which can bear the total mass with the closed type cubicle for switches.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a main circuit connection diagram showing a first embodiment of the present invention. FIG. 6 shows a commercial synchronous system uninterruptible power supply device in the same manner as the conventional circuit described above in FIG. In the example, the conventional closed cubicle 10 is separated into a closed cubicle 20 for a switch that accommodates various breakers and a closed cubicle 30 for a transformer that accommodates an insulating transformer 4, and each breaker is externally provided. The external wire terminal portion 9 for connecting the wires is omitted, the external wires are directly connected to each breaker, and the power supply side terminals of the plurality of load breakers 8 are connected to the common bus 22. This is different from the conventional circuit described in FIG.
[0014]
Since the insulation transformer 4 has a high mass as described above, it is housed in the transformer closed cubicle 30 having a strong structure, and the switch closed cubicle 20 for housing various breakers and their accessories is as follows. Since the device accommodated therein is lightweight, the closed cubicle 20 for a switch is not made so strong. However, even when the quantity and capacity of various breakers are changed due to the specification change, only the closed cubicle 20 for the switch needs to be partially changed, and the modification of the closed cubicle 30 for the transformer can be avoided. .
[0015]
FIG. 2 is an outline view showing a second embodiment of the present invention in a three-dimensional view, corresponding to claim 2, wherein (a) is a front view, (b) is a right side view, and (c) is a plan view. FIG. In the second embodiment of FIG. 2, a closed cubicle 20 for a switch accommodating various breakers and their accessories and a closed cubicle 30 for a transformer accommodating a high-mass insulating transformer 4 are separately manufactured. These cubicles are arranged back to back, and both are integrated. These cubicles have a structure that can be coupled or separated by the arrow shown in the right side view (b) or the arrow shown in the plan view (c).
[0016]
In FIG. 2, since various breakers need to be turned on and off, they are arranged so that the switch closed cubicle 20 is on the front side. In addition, although the gallery 11 for ventilation is provided in the both sides | surfaces and ceiling of the closed cubicle 30 for transformers, if necessary, the gallery 11 for ventilation is also provided in a back part.
FIG. 3 is a structural diagram showing details of the joint portion of both the back-to-back cubicles. In FIG. 3, reference numeral 23 denotes a side plate of the closed cubicle 20 for a switch, which is bent 90 degrees toward the back side. On the other hand, the frame 31 of the transformer closed cubicle 30 is bent 90 degrees toward the front side, and both the bent portions are tightened with the connecting bolt 24 and the nut 25, so that the switch closed cubicle 20 and the transformer closed cubicle 30 are Are combined. Although a back plate 26 is attached to the side plate 23, since a tool insertion hole 27 is opened at a position corresponding to the connecting bolt 24, the connecting bolt 24 can be easily tightened. The cubicle can be easily combined and separated.
[0017]
Various breakers are directly attached to the back plate 26. However, since the mass of each breaker is not large, it is sufficient to attach the back plate 26 and the side plate 23 by spot welding. There are many things.
FIG. 4 is an internal layout diagram showing the third embodiment of the present invention in a three-sided view, showing the contents corresponding to claims 3 to 6, wherein (a) is the inside of a closed cubicle for a switch. (B) is an internal right side view, (c) is an internal plan view, and the closed cubicle 20 for a switch disposed on the front side is connected to a power receiving breaker 3 and an input. A side circuit breaker 5, an output side circuit breaker 6, a bypass circuit circuit breaker 7, and six load circuit breakers 8 are accommodated, and an insulating transformer 4 is accommodated in a closed cubicle 30 for a transformer arranged back to back. ing.
[0018]
As apparent from FIG. 4, the external line terminal portion, which has been conventionally required, is omitted by directly connecting an external electric wire to each breaker. Further, the common bus 22 extends downward from the load side terminal of the bypass circuit breaker 7 to facilitate connection to the power source side terminals of the plurality of load breakers 8, and the connection space is also reduced. A protective cover 28 for preventing electric shock, which is illustrated by hatching, is individually provided on the power supply side terminal portion and the load side terminal portion of each breaker.
[0019]
A breaker mounting hole 29 (see FIG. 4A) that can cope with, for example, an increase in the number of installed load breakers 8 and an increase in capacity is pre-processed on the back plate 26 of the closed cubicle 20 for switches. The common bus 22 is pre-machined with conductor mounting holes 32 (see FIG. 4B) that can cope with an increase in the number of installed load breakers 8 and an increase in capacity.
[0020]
FIG. 5 is an internal layout diagram showing the case where the capacity of each breaker in the third embodiment of FIG. 4 is increased in three views, (a) is an internal front view of a closed cubicle for a switch, (b) Fig. 2 is an internal right side view, and (c) an internal plan view.
In the application example shown in FIG. 5, the power receiving breaker 43, the input side breaker 45, the output side breaker 46, the bypass circuit breaker 47, and the six load breakers 48 are all the third embodiment already described in FIG. Although the capacity is increased as compared with the example, each breaker is mounted using the breaker mounting hole 29 shown in FIG. 4 described above, so that the wiring is the same, and the troublesome work associated with the change can be avoided.
[0021]
FIG. 8 is an internal layout showing the fourth embodiment of the present invention in a three-sided view, and shows the contents corresponding to claims 7 to 8. FIG. 8 shows that a hanging tool 41 is attached to a ceiling plate of a closed cubicle for a transformer, and the hanging tool 41 and the built-in insulating transformer 4 are connected by a plurality of connecting beams 42. Although it is different from 4, it is the same except for this, so the description of the same part is omitted.
[0022]
Since each connecting beam 42 is preferably vertical, the hanger 41 is positioned directly above the insulating transformer 4 and the shape thereof is often rectangular as shown in the figure, but other than rectangular Of course, it does not matter even if it has a shape.
Since the insulation transformer 4 is fixed to the closed cubicle for the transformer that houses the insulation transformer 4, if the lifting tool 41 is lifted by the wire 44 as shown, the lifting tool 41 and the connecting beam 42 connect the insulating transformer 4. Further, the insulation transformer 4 lifts the cubicle. Therefore, the cubicle housing the insulation transformer 4 can greatly reduce the strength compared to the conventional one. Therefore, the frame is omitted, the thickness of the outer plate is reduced, and the outer plate is changed from a metal material to a synthetic resin material. By changing the structure, the structure can be simplified and the mass can be reduced.
[0023]
In addition, when the closed cubicle for a transformer and the closed cubicle for a switch are combined, it is possible to lift both the cubicles simultaneously with the above-described lifting tool 41, but there is a possibility that the center of gravity shifts and tilts when lifting. In that case, a wire is also hung on the eyebolt provided in the closed cubicle for the switch, and the eyebolt is hung together with the hanger 41.
[0024]
FIG. 9 is a structural diagram showing an example of the hanging tool described in FIG. As shown in FIG. 9, a hanging tool 41 in which angle steel is combined in a square shape is placed on the ceiling plate of the cubicle, and a hanging hole 43 for hanging a wire is opened at an appropriate place thereof.
[0025]
【The invention's effect】
In a circuit using a power converter, an insulation transformer is installed on the input side of the power converter in order to block noise from entering from the power source side and transform the input voltage to an appropriate value. Since this insulation transformer has a large mass, a closed cubicle having a strong structure is required to accommodate it. In addition, various breakers are used in the circuit including the power converter, and these circuits and each breaker must be housed in the closed cubicle. However, since it must be housed in a closed cubicle having a strong structure as a whole, there is a drawback that it takes time and effort to manufacture the cubicle. Furthermore, if the circuit quantity and capacity of the circuit and each circuit breaker change as the specification changes, the entire closed cubicle, including the insulated transformer housing part that does not change, must be changed each time. .
[0026]
On the other hand, in the present invention, a robust closed cubicle for a transformer that houses an insulating transformer, and a closed cubicle for a switch that is lightweight and accommodates a change in specifications that accommodates a circuit and various breakers. Design and manufacture separately and install them in a back-to-back arrangement, for example. The closed cubicle for switchgear omits the external terminal part and directly attaches the breaker to the back plate of the cubicle, and pre-processes breaker mounting holes that can accommodate the increase in the number of installed breakers and capacity changes, and also on the common bus By pre-processing conductor mounting holes that can accommodate an increase in the number of breakers installed and capacity changes, the high-strength closed cubicle is limited to the part that houses the insulation transformer. Even if there is an increase or a capacity change, the design / manufacturing can be changed only to the closed cubicle for the switch, and the effect of reducing the labor and cost by the change can be obtained.
[0027]
Furthermore, if a suspension is provided on the top of an insulating transformer where a large mass is concentrated, and this suspension and the transformer are connected by a plurality of connecting beams, this transformer lifts the cubicle. Strength can be eliminated, the structure can be simplified, and the weight can be reduced.
[Brief description of the drawings]
FIG. 1 is a main circuit connection diagram showing a first embodiment of the present invention. FIG. 2 is an outline view showing a third embodiment of the second embodiment of the present invention. FIG. 4 is an internal layout diagram showing the third embodiment of the present invention in a three-sided view. FIG. 5 is a three-sided view when the capacity of each breaker in the third embodiment of FIG. 4 is increased. Internal layout diagram [FIG. 6] General main circuit connection diagram of a commercial synchronous system uninterruptible power supply synchronized with a commercial power source [FIG. 7] A conventional circuit housing the conventional circuit described above in FIG. FIG. 8 is an internal layout diagram showing the fourth embodiment of the present invention in a three-sided view. FIG. 9 shows an example of the hanging bracket described above in FIG. Structure [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Inverter apparatus as power converter 2 Commercial power supply 3,43 Power receiving breaker 4 as power converter switch 4 Insulation transformer 5,45 Input side breaker 6,46 as power converter switch 46 For power converter Output breakers 7 and 47 as switches Switch breakers for bypass circuits 8 and 48 as switches for power converters Load breakers 9 Outer terminal 10 Closed cubicle 11 Ventilation gallery 20 Switched closed cubicle 22 Common bus 23 Side plate 24 Coupling bolt 26 Back plate 27 Tool insertion hole 28 Protective cover 29 Breaker mounting hole 30 Closed cubicle 31 for transformer 31 Frame 32 Conductor mounting hole 41 Lifting tool 42 Connecting beam 43 Hanging hole 44 Wire

Claims (7)

An insulation transformer that insulates AC power input to the power converter, a plurality of load switches that supply the power converted by the power converter to a load, and a configuration that corresponds to the usage status of the power converter In a closed cubicle for a power conversion device in which a plurality of switches for a power conversion device that opens and closes input / output power of the power conversion device at an appropriate position in a circuit, and the closed cubicle,
A closed cubicle for a transformer that houses the insulation transformer, and a closed cubicle for a switch that houses the load switch and a switch for a power converter,
The closed type cubicle for the switch is folded by 90 degrees to form a bent part, and the bent part and the frame of the closed type cubicle for transformer are tightened with a coupling bolt and a nut to thereby close the closed type for the switch A closed cubicle for a power converter , wherein the cubicle and the closed cubicle for a transformer are combined . In the closed type cubicle for power converters according to claim 1,
A back plate constituting the closed cubicle for the switch is attached to the side plate of the closed cubicle for the switch, and a mounting hole for attaching the load switch and the power converter switch is provided on the back plate. A closed cubicle for power converters. The closed cubicle for a power conversion device according to claim 2 ,
A closed cubicle for a power converter , wherein a tool insertion hole is provided at a position corresponding to the coupling bolt of the back plate of the closed cubicle for the switch . In the closed cubicle for power converters according to any one of claims 1 to 3 ,
A power conversion device closure characterized in that a separate electric shock prevention protective cover is provided for each switch on the power supply side terminal portion and the load side terminal portion of each switch housed in the switch type closed cubicle. Type cubicle. In the closed type cubicle for power converters in any one of Claims 1-4 ,
The power supply side conductor of the load switch housed in the closed cubicle for the switch has a common bus structure that can simultaneously connect the load switches, and the common bus has various capacities and a plurality of load switches. A closed cubicle for a power conversion device, characterized in that a conductor mounting hole is provided to which a device can be connected . In the closed type cubicle for power converters according to claim 1 ,
A closed cubicle for a power converter , wherein a hanging tool is installed on a ceiling portion of the closed cubicle for the transformer, and the hanging tool and the insulating transformer are coupled by a plurality of connecting beams . In the closed cubicle for power converters according to claim 6 ,
The hanging tool is attached to a ceiling portion directly above the insulation transformer, and has a shape that allows the plurality of connecting beams to be coupled substantially vertically .

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