JP2020078137A - Electric facility and transformation device - Google Patents

Abstract

To provide an electric facility capable of converting a single-phase two-wire AC power output from a power conversion device into a single-phase three-wire AC power having a voltage corresponding to a voltage required by a load.SOLUTION: An electric facility 1 comprises a power conversion device 4 and a transformation device 5. The power conversion device 4 converts a DC power into a first AC power. The transformation device 5 transforms the first AC power converted by the power conversion device 4 to generate a second AC power. The power conversion device 4 outputs, using electric paths 11a and 11b, the first AC power to the transformation device 5 so that the voltage of the first AC power is applied between the electric paths 11a and 11b. The transformation device 5 outputs, using a first electric path 12a, a second electric path 12b and a third electric path 12c, the second AC power so that a transformed voltage V4 generated by transforming the voltage of the first AC power is applied between the first electric path 12a and the third electric path 12c, and divided voltages V2 and V3 of the transformed voltage V4 are applied between the first electric path 12a and the second electric path 12b and between the second electric path 12b and the third electric path 12c.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates generally to electrical equipment and transformers, and more particularly to electrical equipment and transformers that convert an AC power distribution system from a single-phase two-wire system to a single-phase three-wire system.

  The power storage system (electrical equipment) described in Patent Document 1 includes a power conditioner (electric power converter) and a transformer (transformer). The power conditioner converts the discharge power of the storage battery into AC power and outputs the AC power to the transformer. The transformer converts the AC power output from the power conditioner from a two-wire system (single-phase two-wire system) to a three-wire system (single-phase three-wire system), and outputs the converted AC power to a load.

JP, 2017-5931, A

  In the power storage system described in Patent Document 1, the transformer only converts the AC power output from the power conditioner from the two-wire system to the three-wire system, and does not transform the AC power. Therefore, the voltage of the three-wire AC power output from the power conditioner may not correspond to the required voltage required by the load.

  In view of the above reasons, the present disclosure, single-phase two-wire AC power output from the power converter, can be converted to a single-phase three-wire AC power having a voltage corresponding to the required voltage of the load, electrical equipment, And a transformer for use in electrical equipment.

  The electrical equipment according to an aspect of the present disclosure includes a power conversion device and a transformer device. The power conversion device converts input DC power into first AC power. The transformer transforms the voltage of the first AC power converted by the power converter to generate second AC power. The power conversion device outputs the first AC power to the transformer device by using two electric paths so that the voltage of the first AC power is applied between the two electric paths. The transformer device uses three electric lines, which are a first electric line, a second electric line, and a third electric line, and transforms the voltage of the first AC power between the first electric line and the third electric line. Therefore, the second AC power is output so that the divided voltage of the transformed voltage is applied between the first electric line and the second electric line and between the second electric line and the third electric line.

  A transformer device according to an aspect of the present disclosure is a transformer device used in the electrical equipment of the above aspect.

  The present disclosure has an advantage that single-phase two-wire AC power output from the power converter can be converted into single-phase three-wire AC power having a voltage corresponding to the required voltage of the load.

FIG. 1 is a configuration diagram showing a configuration of an electric facility according to an embodiment. FIG. 2 is a configuration diagram showing the configuration of the transformer device according to the first modification. FIG. 3 is a configuration diagram illustrating a configuration of a transformer device according to the second modification.

  Hereinafter, the electrical equipment according to the embodiment will be described. The following embodiments are merely examples of various embodiments of the present disclosure. Further, the following embodiments can be variously modified according to the design and the like as long as the object of the present disclosure can be achieved.

  The electrical equipment 1 according to the present embodiment will be described with reference to FIG. 1. As shown in FIG. 1, the electric equipment 1 according to the present embodiment is, for example, a single-phase three-wire system having a DC power output from the photovoltaic power generator 2 and a voltage corresponding to a required voltage required by the load 3. It is an electric facility that converts into AC power (second AC power) and outputs it to the load 3.

  The above-mentioned “voltage corresponding to the required voltage required by the load 3” is the same voltage as the required voltage of the load 3 or within a range that does not affect the operation of the load 3, Large or small voltage. Further, the single-phase three-wire system is a power distribution system that supplies single-phase AC power using three electric lines.

  The solar power generation device 2 is a power generation device that converts sunlight energy into electric energy (DC power) using a solar cell. The solar power generation device 2 is an example of a power source other than the commercial power system. Therefore, the solar power generation device 2 may be a power storage device. The power storage device is a device including a chargeable / dischargeable power storage place. The power storage device may be charged with electric power supplied from the commercial power system or may be charged with electric power supplied from the solar power generation device.

  The load 3 indicates at least one load. The load 3 may be not only an electric device but also an outlet installed in a building. An outlet is a device having an insertion port into which a power plug from an electric device is inserted.

  The electric equipment 1 includes a power converter 4 and a transformer 5.

  The power conversion device 4 is a device that converts DC power input from the solar power generation device 2 into single-phase two-wire AC power (first AC power). The power converter 4 functions as an independent power source. An independent power source is a power source other than the commercial power grid. The single-phase two-wire system is a power distribution system that supplies single-phase AC power using two electric circuits. The single-phase two-wire type AC power is AC power distributed by a single-phase two-wire type power distribution system. The power conversion device 4 includes two input terminals P1 and P2, two output terminals P3 and P4, a booster circuit 41, and a DC-AC conversion circuit 42.

  The two input terminals P1 and P2 are portions into which the DC power output from the solar power generation device 2 is input. The two input ends P1 and P2 are connected to the positive electrode and the negative electrode of the solar power generation device 2. The two output terminals P3 and P4 are portions that output the output voltage of the power conversion device 4. The two output terminals P3 and P4 are connected to the two output terminals of the DC-AC conversion circuit 42 via the electric wires 6a and 6b. Further, the two output terminals P3 and P4 are connected to two later-described two input terminals P5 and P6 of the transformer 5 via the electric wires 7a and 7b.

  The booster circuit 41 is a circuit that boosts the DC power input to the two input terminals P1 and P2 to DC power having a predetermined voltage. The DC power boosted by the booster circuit 41 is output to the DC-AC converter circuit 42. The booster circuit 41 is composed of, for example, a boost converter (boost chopper circuit) having a choke coil, a switching element, a diode, a smoothing capacitor, and the like.

  The DC-AC conversion circuit 42 is connected to the subsequent stage of the booster circuit 41 and is a circuit that converts the single-phase two-wire DC power output from the booster circuit 41 into single-phase two-wire AC power. The above-mentioned single-phase / two-wire AC power is, for example, an AC voltage of 101V. The single-phase two-wire type AC power converted by the DC-AC conversion circuit 42 has two output ends P3, P4 via the electric wires 6a, 6b so that the voltage is applied between the two electric wires 6a, 6b. Is output to. The output AC power is output to the transformer device 5 from the two output terminals P3 and P4 via the electric wires 7a and 7b.

  The transformer 5 is a device that transforms (steps up in this embodiment) the voltage of the single-phase two-wire AC power converted by the power converter 4. The transformer 5 is a device that converts the single-phase two-wire AC power converted by the power converter 4 into single-phase three-wire AC power (second AC power). In other words, the transformer 5 converts the AC power distribution system from the power converter 4 from a single-phase two-wire system to a single-phase three-wire system. The single-phase three-wire type AC power is AC power distributed by the single-phase three-wire type power distribution method. The transformer 5 is separate from the power converter 4. Thereby, the transformer device 5 can be retrofitted to the electric equipment 1.

  The transformer device 5 includes two input terminals P5, P6, three output terminals P7, P8, P9, a transformer 51, and an earth leakage breaker 52.

  The two input terminals P5 and P6 are portions to which the AC power output from the power conversion device 4 is input. The two input terminals P5 and P6 are connected to the two output terminals P3 and P4 of the power conversion device 4 via the electric wires 7a and 7b. Further, the two input terminals P5 and P6 are connected to the primary side of the transformer 51 via the electric wires 8a and 8b. The three output terminals P7, P8, P9 are connected to the secondary side of the transformer 51 via electric wires 9a, 9b, 9c. Further, the three output terminals P7, P8, P9 are connected to the load 3 via the electric wires 10a, 10b, 10c.

  Here, in the above single-phase two-wire system, two electric circuits (electric circuit 11a and electric circuit 11b) are used. The electric path 11a is composed of an electric wire 6a, an electric wire 7a and an electric wire 8a which are connected in series with each other. The electric path 11b is composed of an electric wire 6b, an electric wire 7b and an electric wire 8b which are connected to each other in series. In the above single-phase three-wire system, three electric circuits (electric circuit 12a (first electric circuit), electric circuit 12b (second electric circuit) and electric circuit 12c (third electric circuit)) are used. The electric path 12a is composed of an electric wire 9a and an electric wire 10a which are connected in series with each other. The electric path 12b is composed of an electric wire 9b and an electric wire 10b which are connected to each other in series. The electric path 12c is composed of an electric wire 9c and an electric wire 10c which are connected in series with each other.

  One of the two electric paths 11a and 11b is grounded. That is, one electric circuit 11a is an electrically neutral wire. The electric circuit 11a used in the above single-phase two-wire system is the electric circuit on the primary side of the transformer 51. Therefore, by grounding the electric path 11a as described above, the range from the primary side to the secondary side of the transformer 51 can be protected from the abnormal current that occurs at the time of a ground fault or the like. More specifically, the electric wire 6a in the electric line 11a (that is, the electric wire inside the power conversion device 4) is grounded. Thereby, the grounding position in the electric line 11a can be arranged on the most upstream side of the electric line 11a. As a result, the range including the power converter 4 on the primary side of the transformer 51 (that is, the transformer 5) can be protected from an abnormal current that occurs when a ground fault occurs.

  The transformer 51 transforms (steps up in this embodiment) the voltage of the single-phase two-wire AC power input to the two input terminals P5 and P6. Further, the transformer 51 converts the single-phase, two-wire type AC power into the single-phase, three-wire type AC power. The AC power transformed and converted by the transformer 51 as described above is output from the three output terminals P7, P8, and P9.

  The transformer 51 is, for example, a single-turn transformer, and has a coil 511 and a magnetic path. The coil 511 is a coil that serves as both a primary coil and a secondary coil. Since the transformer 51 is a single-winding transformer, the transformer 51 can be inexpensively constructed. The magnetic path is, for example, annular. The coil 511 is wound around the magnetic path a plurality of times. The ends of the two electric wires 8a and 8b (that is, the two electric paths 11a and 11b) are connected to the coil 511. In the coil 511, the connection positions S1 and S2 to which the two electric wires 8a and 8b are respectively connected are arranged along the central axis of the coil 511 with a space therebetween. Further, the ends of the three electric wires 9a, 9b, 9c (that is, the three electric paths 12a, 12b, 12c) are connected to the coil 511. In the coil 511, the connection positions S3, S4, S5 to which the three electric wires 9a, 9b, 9c are respectively connected are arranged along the central axis of the coil 511 at intervals.

  The transformer 51 transforms the voltage of the AC power input via the two electric paths 11a and 11b. In addition, the transformer 51 applies a voltage (transforming voltage) obtained by transforming the voltage of the above AC power between the two electric lines 12a and 12c, and between the two electric lines 12a and 12b and between the two electric lines 12a and 12b. The transformed AC power is output using the three electric paths 12a, 12b, 12c so that the divided voltage of the transformed voltage is applied therebetween.

  In the following description, the voltage applied between the two electric paths 11a and 11b is described as the line voltage V1 (first line voltage). The voltage applied between the two electric circuits 12a and 12b is described as line voltage V2 (second line voltage). The voltage applied between the two electric circuits 12b and 12c) is described as the line voltage V3 (third line voltage). The voltage applied between the two electric circuits 12a and 12c is described as line voltage V4. The line voltage V4 is a voltage obtained by adding the two line voltages V2 and V3.

  The transformer 51 outputs, as the line-to-line voltage V2 and the line-to-line voltage V3, voltages that are the same as each other and that correspond to the line-to-line voltage V1 (equivalent voltage). As a result, the line voltage V4 is a voltage that is the sum of the two line voltages V2 and V3 as described above, and thus is a voltage that is twice the equivalent voltage described above. Thus, the transformer 51 outputs the line voltage V1 and the line voltage V3, which are the same voltage as each other, so that the line voltage V1 is twice as large as the line voltage. The voltage is increased to the line voltage V4, which is the voltage of the above. By this boosting, the line voltage V1 is transformed into a voltage corresponding to the required voltage of the load 3.

  The transformer 51 outputs line voltages V2 and V3, which are the same voltage, in addition to the line voltage V4. That is, the transformer 51 outputs two types of voltages (line voltage V4 and line voltages V2, V3). Therefore, the transformer 51 can cope with two types of loads as the load 3, that is, a load having the line voltage V4 as the required voltage and a load having the line voltages V2 and V3 as the required voltage.

  The “voltage corresponding to the line voltage V1 (equivalent voltage)” is a voltage higher than the line voltage V1. That is, the transformer 51 outputs, as the line voltage V2 and the line voltage V3, voltages that are the same as each other and are larger than the line voltage V1. In other words, the transformer 51 boosts the line voltage V1 to a voltage higher than the line voltage V1 and outputs the boosted voltage as the line voltage V2 and the line voltage V3. In this way, by outputting a voltage larger than the line voltage V1 as the above-mentioned equivalent voltage, even if the line voltages V2 and V3 drop in voltage during the conduction of the electric path, the voltage required on the load 3 side is required. (Voltage of line voltage V1 or more) can be secured. Further, even if the line voltage V4 drops during the conduction of the electric path, it is possible to secure the necessary voltage on the load 3 side (a voltage equal to or more than twice the line voltage V1). The above-mentioned equivalent voltage may be, for example, a voltage which is higher than the line voltage V1 by several volts (voltage drop (for example, several volts)).

  In the present embodiment, the above-mentioned “voltage corresponding to the line voltage V1 (equivalent voltage)” is a voltage higher than the line voltage V1, but may be the same voltage as the line voltage V1.

  In the present embodiment, the line voltage V1 is the output voltage of the power converter 4 and is, for example, 101 V as described above. Further, in the present embodiment, the line voltages V2 and V3 are respectively set to 103V, and the line voltage V4 is set to 206V, for example. Therefore, in the present embodiment, the transformer 51 boosts the single-phase two-wire 101V AC power input to the two input terminals P5 and P6 and converts it into the single-phase three-wire 103V / 206V AC power. And output from the three output terminals P7, P8, P9.

  The transformer 51 transforms the line voltage V1 according to the ratio of the number of turns of the coil 511 between the two connection positions S1 and S2 and the number of turns of the coil 511 between the two connection positions S4 and S5. Output as voltage V3. In the present embodiment, as described above, the line voltage V3 is 103V and the line voltage V1 is 101V, so the line voltage V3 is larger than the line voltage V1. Therefore, the number of turns of the coil 511 between the two connection positions S4 and S5 is larger than the number of turns of the coil 511 between the two connection positions S1 and S2.

  In the transformer 51, two line voltages V2 and V3 are set according to the ratio of the number of turns of the coil 511 between the two connection positions S3 and S4 and the number of turns of the coil 511 between the two connection positions S4 and S5. The ratio of is determined. In the present embodiment, as described above, the two line voltages V2 and V3 are both 103 V and the same voltage. Therefore, the number of turns of the coil 511 between the two connection positions S3 and S4 is the same as the number of turns of the coil 511 between the two connection positions S4 and S5.

  One connection position S1 of the two connection positions S1 and S2 coincides with the middle connection position S4 of the three connection positions S3, S4 and S5. Thereby, the electric line 11a and the electric line 12b can be set to the same potential. In the present embodiment, since the electric line 11a is a neutral line, the electric line 12b is set to the neutral line by matching the connecting position S1 with the connecting position S4 as described above, even if the electric line 12b is not grounded. it can. The other connection position S2 of the two connection positions S1 and S2 is arranged between the two connection positions S4 and S5.

  The earth leakage breaker 52 is a circuit breaker that conducts the electric paths 11a and 11b when the electric leakage is not detected, and interrupts the electric paths 11a and 11b when the electric leakage is detected. The earth leakage breaker 52 is a two-pole breaker that is provided across the two electric wires 8a and 8b (that is, the two electric paths 11a and 11b) and can conduct and interrupt each of the two electric wires 8a and 8b. The above "conductivity can be interrupted" means that conduction and interruption can be selectively selected. In the present embodiment, the earth leakage breaker 52 is installed on the two electric wires 8a, 8b in the transformer 5, but may be installed on the two electric wires 6a, 6b in the power converter 4.

  As described above, the electric equipment 1 according to this embodiment includes the power converter 4 and the transformer 5. The power conversion device 4 converts the input DC power into single-phase two-wire AC power. The transformer 5 transforms the voltage of the single-phase two-wire AC power converted by the power converter 4 and converts it into single-phase three-wire AC power. Therefore, the transformer 5 can convert the single-phase two-wire AC power converted by the power converter 4 into single-phase three-wire AC power, and can also transform the power. By this transformation, the output voltage of the transformation device 5 can be transformed into a voltage corresponding to the required voltage of the load 3. As a result, the single-phase two-wire AC power converted by the power converter 4 can be converted to the single-phase three-wire AC power having a voltage suitable for the required voltage of the load 3.

(Modification)
Hereinafter, modified examples of the above embodiment will be described. The following modifications may be implemented in combination. In the following description of the modified example, the same components as those in the above-described embodiment may be designated by the same reference numerals and the description thereof may be omitted.

(Modification 1)
In the above embodiment, as shown in FIG. 1, in the coil 511, one connection position S1 of the connection positions S1 and S2 of the two electric paths 11a and 11b is the connection position of the three electric paths 12a, 12b, and 12c. It coincides with the middle connection position S4 of S3, S4 and S5. However, the positional relationship between the connection positions S1, S2 of the two electric paths 11a, 11b and the connection positions S3, S4, S5 of the three electric paths 12a, 12b, 12c is not limited to this. For example, as shown in FIG. 2, the connection position S4 may be arranged between the connection positions S1 and S2.

  In this modification, the electric circuit 11a is not grounded.

  Further, in the present modification, in the coil 511, the connection position S1 is connected between the connection positions S3 and S4, and the connection position S2 is connected between the connection positions S4 and S5. The number of turns of the coil 511 between the connection positions S1 and S4 is the same as the number of turns of the coil 511 between the connection positions S4 and S2.

  Further, in this modification, the transformer device 5 further includes resistors R1 and R2. The resistor R1 is connected between the branch point N1 of the electric line 11a (for example, the electric wire 8a) and the ground point. The resistor R2 is connected between the branch point N2 of the electric path 11b (for example, the electric wire 8b) and the ground point. The resistors R1 and R2 have the same value, for example.

  In this modification, for example, the line voltage V1 is 100V, the line voltages V2 and V3 are 100V, and the line voltage V4 is 200V. If the voltage between the connection positions S1 and S4 is V11 and the voltage between the connection positions S4 and S2 is V12, the voltages V11 and V12 are 50V, for example.

  According to this modification, since the connection position S1 does not coincide with the connection position S4, the degree of freedom in arranging the connection position S1 can be improved. Further, the connection positions S1 and S2 can be arranged symmetrically with respect to the connection position S4.

  In this modification, the electric lines 11a and 11b are grounded via the resistors R1 and R2, but the grounding of the electric lines 11a and 11b via the resistors R1 and R2 is omitted and the electric line 9b is grounded. Good.

(Modification 2)
In the above embodiment, the transformer 51 is a single-turn transformer, but as shown in FIG. 3, the transformer 51 may be a double-turn transformer. In this case, the transformer 51 includes a primary coil 55, a secondary coil 56, and a magnetic path. The magnetic path is, for example, annular. The primary coil 55 is wound around the magnetic path a plurality of times. The secondary coil 56 is also wound around the magnetic path a plurality of times. Two electric wires 8a and 8b (that is, two electric paths 11a and 11b) are connected to the primary coil 55. Three electric wires 9a, 9b, 9c (that is, three electric paths 12a, 12b, 12c) are connected to the secondary coil 56. In the present embodiment, the middle electric wire 9b (electric line 12b) among the three electric wires 9a, 9b, 9c is grounded. The electric circuit 11a is grounded on the side of the power conversion device 4 as in the above embodiment.

  According to this modification, since the transformer 51 is a double-winding transformer, it is possible to prevent a direct current from flowing between the primary coil 55 and the secondary coil 56 of the transformer 51. Therefore, the transformer 51 can prevent an abnormal current flow.

(Other modifications)
In the above embodiment, the transformer device 5 is configured separately from the power conversion device 4, but may be configured integrally with the power conversion device 4. As a result, it is not necessary to secure a place for installing the transformer 5, and the installation work is performed, and the transformer 5 can be easily installed.

  In the above embodiment, the transformer 5 converts the single-phase two-wire AC power converted by the power converter 4 into its single-phase three-wire AC power by boosting the voltage. The single-phase two-wire AC power converted by the converter 4 may be stepped down and converted into single-phase three-wire AC power.

(Summary)
The electric equipment (1) according to the first aspect includes a power conversion device (4) and a transformer device (5). The power converter (4) converts the input DC power into first AC power. The transformer (5) transforms the first AC power converted by the power converter (4) to generate second AC power. The power conversion device (4) uses the two electric paths (11a, 11b) to transform the first AC power into a transformer device (11a, 11b) so that the voltage of the first AC power is applied between the two electric paths (11a, 11b). Output to 5). The transformer device (5) uses three electric paths that are the first electric path (12a), the second electric path (12b), and the third electric path (12c), and A transforming voltage (V4) obtained by transforming the voltage of the first AC power is applied between the first electric circuit (12a) and the second electric circuit (12b) and between the second electric circuit (12b) and the third electric circuit (12c). Then, the second AC power is output so that the divided voltage (V2, V3) of the transformed voltage (V4) is applied to the.

  According to this configuration, the transformer device (5) can convert the single-phase two-wire first AC power converted by the power converter (4) into the single-phase three-wire second AC power, and also transform the power. it can. By this transformation, the output voltage of the transformation device (5) can be transformed into a voltage corresponding to the required voltage of the load (3). As a result, the single-phase two-wire first AC power converted by the power converter (4) can be converted to single-phase three-wire AC power having a voltage suitable for the load (3).

  In the electric equipment (1) according to the second aspect, in the first aspect, the voltage applied between the two electric paths (11a, 11b) is the first line voltage (V1). The three electric lines (12a, 12b, 13c) are referred to as a first electric line (12a), a second electric line (12b) and a third electric line (12c). A voltage applied between the first electric line (12a) and the second electric line (12b) is referred to as a second line voltage (V2). A voltage applied between the second electric line (12b) and the third electric line (12c) is referred to as a third line voltage (V3). The transformer device (5) outputs a voltage corresponding to the first line voltage (V1) as the second line voltage (V2) and the third line voltage (V3), respectively.

  According to this configuration, each of the second line voltage (V2) and the third line voltage (V3) is a voltage (equivalent voltage) corresponding to the first line voltage (V1). The line voltage (V4) applied between the first electric line (12a) and the third electric line (12c) is a voltage obtained by adding the first line voltage (V1) and the second line voltage (V2). Therefore, the voltage becomes twice the above equivalent voltage. That is, the transformer device (5) can output two types of voltages, an equivalent voltage and a voltage twice the equivalent voltage.

  In the electrical equipment (1) according to the third aspect, in the second aspect, the transformer device (5) has a first line voltage (V2) and a third line voltage (V3), respectively. A voltage greater than the inter-voltage (V1) is output.

  According to this configuration, even if the second line voltage (V2) and the third line voltage (V3) drop during the conduction of the electric path, the load (3) side has the first line voltage (V1) or more. The voltage of can be secured.

  In the electrical equipment (1) according to the fourth aspect, in any one of the first to third aspects, one of the two electrical paths (11a, 11b) is electrically grounded (11a). There is.

  According to this configuration, since the one electric path (11a) is the electric path on the primary side of the transformer (5), the range from the primary side to the secondary side of the transformer (5) is a ground fault. It is possible to protect from abnormal current that occurs in such as.

  In the electrical equipment (1) according to the fifth aspect, in the fourth aspect, a portion (6a) arranged inside the power conversion device (4) in the one electric path (11a) is grounded. ..

  According to this configuration, the range including the power converter (4) on the primary side of the transformer (5) can be protected from an abnormal current that occurs when a ground fault occurs.

  The electrical equipment (1) which concerns on a 6th aspect is further provided with the earth leakage breaker (52) in any one aspect of the 1st-5th aspect. The earth leakage breaker (52) is provided in two electric circuits (11a, 11b).

  According to this structure, since the earth leakage breaker (52) is installed in the two electric paths (11a, 11b), the two-pole broker can be used as the earth leakage breaker (52). That is, if the earth leakage breaker (52) is installed in the three secondary electric paths (12a, 12b, 12c) of the transformer device (5), the three-pole breaker is used. However, in the present invention, since the earth leakage breaker (52) is installed in the two electric paths (11a, 11b) on the primary side of the transformer (5), a two-pole breaker that is cheaper than the three-pole breaker can be used. .. Moreover, since the two electric paths (11a, 11b) in which the earth leakage breaker (52) is installed are the electric wires on the primary side of the transformer device (5), the earth leakage breaker (52) is used on the primary side of the transformer device (5). The range from to the secondary side can be protected from leakage.

  In the electric facility (1) according to the seventh aspect, in any one of the first to sixth aspects, the transformer device (5) is a separate body from the power converter device (4).

  According to this structure, the transformer device (5) can be retrofitted to the electric equipment (1).

  In the electric equipment (1) according to the eighth aspect, in any one of the first to sixth aspects, the transformer device (5) is integral with the power converter device (4).

  According to this configuration, it is not necessary to secure a place for installing the transformer device (5) or perform an installation work, and the transformer device (5) can be easily installed.

  In the electric equipment (1) according to the ninth aspect, in any one of the first to eighth aspects, the transformer device (5) includes a coil (511). Two electric paths (11a, 11b) are connected to the coil (511), and three electric paths (12a, 12b, 13c) are connected.

  According to this configuration, the transformer device (5) is a single-turn transformer device in which the primary coil and the secondary coil are combined into one coil (511). Therefore, the transformer device (5) can be constructed at a lower cost than a transformer device with multiple turns in which the primary coil and the secondary coil are separate.

  In the electrical equipment (1) according to the tenth aspect, in the ninth aspect, one of the connection positions (S1, S2) to which each of the two electric paths (11a, 11b) is connected in the coil (511). The connection position (S1) of 1 corresponds to the middle connection position (S4) of the connection positions (S3, S4, S5) to which each of the three electric paths (12a, 12b, 13c) is connected.

  According to this configuration, one of the two electric paths (11a, 11b) is the same as the middle electric path (12b) of the three electric paths (12a, 12b, 13c). Can be at electric potential. Particularly, when the electric line (11a) is a neutral wire, the connection position (S1) is made to coincide with the connection position (S4) as described above, so that the middle electric line (12b) side is not grounded. Also, the middle electric line (12b) can be set to the neutral line.

  In the electrical equipment (1) according to the eleventh aspect, in the ninth aspect, in the coil (511), connection positions (S3, S4, S5) to which each of the three electric paths (12a, 12b, 13c) is connected. The middle connection position (S4) is arranged between the connection positions (S1, S2) to which the two electric paths (11a, 11b) are respectively connected.

  According to this configuration, the connection positions (S1, S2) of the two electric paths (11a, 11b) are the same as the connection positions (S3, S4, S5) of the three electric paths (12a, 12b, 13c). It is not necessary to match the connection position (S4) in the middle of. Therefore, the degree of freedom in arranging the connection positions (S1, S2) can be improved. Further, the connection positions (S1, S2) can be arranged symmetrically with respect to the connection position (S4).

  The transformer device (5) according to the twelfth aspect is the transformer device (5) used in the electrical equipment (1) according to any one of the first to eleventh aspects.

  According to this structure, the transformer device (5) used in the electric equipment (1) can be provided.

1 Electrical Equipment 4 Power Converter 5 Transformers 11a, 11b, Electric Circuit 12a Electric Circuit (First Electric Circuit)
12b Electric line (second electric line)
12c Electric circuit (3rd electric circuit)
511 coil 52 earth leakage breaker S1, S2, S3, S4, S5 connection position V1 line voltage (first line voltage)
V2 line voltage (second line voltage)
V3 line voltage (third line voltage)
V4 line voltage (transforming voltage)

Claims (12)

A power converter that converts the input DC power into first AC power;
A transformer for transforming the voltage of the first AC power converted by the power converter to generate second AC power,
The power conversion device outputs the first AC power to the transformer device by using two electric paths so that the voltage of the first AC power is applied between the two electric paths,
The transformer device uses three electric lines, which are a first electric line, a second electric line, and a third electric line, and transforms the voltage of the first AC power between the first electric line and the third electric line. The second AC power is output so that the divided voltage is applied between the first electric path and the second electric path and between the second electric path and the third electric path.
electrical equipment. The voltage applied between the two electric paths is the first line voltage,
The voltage applied between the first electric line and the second electric line is the second line voltage, and the voltage applied between the second electric line and the third line is the third line voltage,
The transformer outputs, as the second line voltage and the third line voltage, voltages corresponding to the first line voltage, respectively.
The electric equipment according to claim 1. The transformer outputs, as the second line voltage and the third line voltage, voltages higher than the first line voltage, respectively.
The electric equipment according to claim 2. One of the two electric paths is grounded,
The electric equipment according to any one of claims 1 to 3. A portion of the one electric path disposed inside the power conversion device is grounded,
The electric equipment according to claim 4. Further comprising an earth leakage breaker provided in the two electric paths,
The electric equipment according to any one of claims 1 to 5. The transformer is a separate body from the power converter.
The electric equipment according to any one of claims 1 to 6. The transformer is integral with the power converter,
The electric equipment according to any one of claims 1 to 6. The transformer is
A coil to which the two electric lines are connected and the three electric lines are connected,
The electric equipment according to any one of claims 1 to 8. In the coil, one connection position of the connection positions to which each of the two electric paths is connected coincides with the middle connection position of the connection positions to which each of the three electric paths is connected,
The electric equipment according to claim 9. In the coil, the middle connection position of the connection positions to which each of the three electric paths is connected is arranged between the connection positions to which each of the two electric paths is connected.
The electric equipment according to claim 9.   A transformer device used in the electrical equipment according to any one of claims 1 to 11.

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