JP7382106B1 - Power reception and distribution systems, power distribution boards, and transformers compatible with EV chargers, etc. - Google Patents

Abstract

[Issue] In a three-winding transformer, the sum of the rated capacities of the secondary and tertiary windings is made larger than the rated capacity of the primary winding to meet the need for additional loads and reduce costs. ” and so on. A power receiving/distributing system 1, a power receiving/distributing board 10, and a transformer 3 have a load 2 and a transformer 3 that consume electric power etc. from a system K. The transformer 3 is a three-winding type transformer, the primary winding is connected to the system K, the 2nd and 3rd windings are connected to the load 2, and the rated voltage of each of the 2nd and 3rd windings is the same as the primary winding. The voltage is lower than the rated voltage on the winding side, and the sum of the rated capacities on the secondary and tertiary winding sides is greater than the rated capacity on the primary winding side. In addition, the transformer 3 may be connected to a charger 2B for an electric vehicle, a power storage device 4, a power generator 5, etc. to the tertiary winding, or the tertiary winding may be used for a predetermined period of time exceeding its rated capacity. , the transformer 3 may support a high-voltage panel casing 8A containing a built-in grid breaker 7a for the grid-side electrical line 6a and a low-voltage panel casing 8B containing a built-in load breaker 7b for the load-side electrical line 6b. . [Selection diagram] Figure 1

Description

The present invention relates to a power reception and distribution system having a transformer connected between a load and a grid, a power reception and distribution board, and a transformer.

Conventionally, a power supply management system is known as an example of a power reception and distribution system (see Patent Document 1).
This power supply management system includes a first electrical load device that is used in a consumer's residence and whose power consumption is different from the first value; A system for supplying power from a power supply system to a second electric load device having a second value, the system comprising: a rate setting unit that sets a power rate unit price for each time zone; In the system, the system includes a notification unit that notifies the consumer of information, wherein the rate setting unit sets a first power rate unit price that is a power rate unit price for the first electric load device, and a power rate unit price for the second electric load device. The second power rate unit price, which is the unit price, is configured to be set to be different from each other.

Japanese Patent Application Publication No. 2016-85531

The power supply management system described in the above-mentioned Patent Document 1 has become popular in recent years, as electric vehicles that emit no exhaust gas have become widespread due to increasing awareness of issues such as preventing global warming and dependence on fossil fuels. 2 The electric load device is a charging/discharging device used to charge the on-board storage battery for driving the car. It is necessary to charge the storage battery at a charging station installed at a location, etc.
Here, in order to make this charging time practical, such as several minutes to several tens of minutes, a charger (such as a quick charger) that supplies more than a predetermined amount of power (such as 100 kW or more) is required.

However, as described in paragraphs 0020 and 0059 of Patent Document 1, this power supply management system supplies power from the power supply system while ensuring that the rated capacity of the transformer is not exceeded. There is a need to use an additional load such as a charger that exceeds the rated capacity of the device.
In order to meet such needs, in the past, it was necessary to install separate power receiving and distribution equipment, which posed the problem of incurring extra costs such as installation costs.

In view of these points, the present invention makes the sum of the rated capacities of the secondary and tertiary windings in a three-winding transformer larger than the rated capacity of the primary winding, thereby reducing the need for "additional load." The company aims to provide power receiving and distribution systems, power receiving and distribution boards, and transformers that can meet customer needs and reduce costs.

A power receiving and distributing system 1 according to the present invention is a power receiving and distributing system having a load 2 capable of consuming power received from a system K, and a transformer 3 connected between the load 2 and the system K. The load 2 includes a secondary load 2a and a tertiary load 2b, and the transformer 3 is a three-winding type transformer including a primary winding, a secondary winding, and a tertiary winding. The primary winding is connected to the system K, the secondary winding is connected to the secondary load 2a, the tertiary winding is connected to the tertiary load 2b, and the rating of the secondary winding is Each of the voltage and the rated voltage on the tertiary winding side is lower than the rated voltage on the primary winding side, and the sum of the rated capacity on the secondary winding side and the rated capacity on the tertiary winding side is: A lighting load 2a1 and/or a power load 2a2, which is larger than the rated capacity of the primary winding side, is connected to the secondary winding of the transformer 3 as the secondary load 2a, and the transformer 3 At least a vehicle charger 2B having a built-in storage battery is connected to the tertiary winding as the tertiary load 2b, and a power storage device 4 and/or a power generation device 5 are also connected to the tertiary winding. A panel in which a system breaker 7a capable of interrupting a system side electric line 6a between K and the transformer 3 and a load breaker 7b capable of interrupting a load side electric line 6b between the transformer 3 and the load 2 are provided inside. The first feature is that it has a housing 8 and a power distribution board 10 including the transformer 3 .

A second feature of the power receiving and distribution system 1 according to the present invention is that, in addition to the first feature, the transformer 3 has a rated capacity of at least the tertiary winding side to which the charger 2B is connected. The point is that it is used only for a predetermined period of time.

A power receiving and distribution board 10 according to the present invention includes a board housing 8 and a transformer 3 connected outside the board housing 8 between a system K and a load 2 that can consume power received from the system K. In the switchboard, the transformer 3 is a three-winding type transformer including a primary winding, a secondary winding, and a tertiary winding, and the primary winding is connected to a system K, The secondary winding is connected to the secondary load 2a, the tertiary winding is connected to the tertiary load 2b, and the rated voltage of the secondary winding and the rated voltage of the tertiary winding are respectively is lower than the rated voltage of the primary winding, and the sum of the rated capacity of the secondary winding and the rated capacity of the tertiary winding is greater than the rated capacity of the primary winding. , the panel casing 8 includes a high voltage panel casing 8A in which a system breaker 7a capable of interrupting the system side electric line 6a between the system K and the transformer 3 is provided, and a high voltage panel casing 8A that is connected to the transformer 3 and the load 2. The transformer includes a low voltage panel casing 8B in which a load breaker 7b capable of interrupting the load-side electric line 6b between The first feature is that 3 is supported .

In addition, the power receiving and distribution board 10 is equipped with a transformer 3 connected between a power grid K and a load 2 that can consume power received from the power grid K outside the board case 8. The panel housing 8 includes a high voltage panel housing 8A in which a system breaker 7a capable of interrupting the system side electric line 6a between the system K and the transformer 3 is provided; The weight of the high voltage panel housing 8A and the weight of the low voltage panel housing 8B are the same as the weight of the high voltage panel housing 8A and the weight of the low voltage panel housing 8B. , may be supported by the transformer 3.

A second feature of the power distribution board 10 according to the present invention is that, in addition to the first feature, the weight of the high voltage board casing 8A and the weight of the low voltage board casing 8B are supported by the transformer 3. The casing 8A is attached to the transformer 3 from above, the low voltage panel casing 8B is attached to the high voltage panel casing 8A from one side in plan view, and the lower end of the low voltage panel casing 8B is attached to the transformer 3. It is located at a point extending to the bottom of 3.

A third feature of the power distribution board 10 according to the present invention, in addition to the second feature described above, is that a hanging tool 3a is provided at a position eccentric to one side of the transformer 3 in a plan view.

In addition, the transformer 3 is a transformer connected between a system K and a load 2 that can consume power received from the system K, and the transformer has a primary winding and a secondary winding. The transformer is a three-winding type transformer having a tertiary winding, the primary winding is connected to the system K, the secondary winding is connected to the secondary load 2a, and the tertiary winding is connected to the system K. The rated voltage of the secondary winding side and the rated voltage of the tertiary winding side are each lower than the rated voltage of the primary winding side, and the rated voltage of the secondary winding side is connected to the secondary side load 2b. The sum of the rated capacity of the tertiary winding side and the rated capacity of the tertiary winding side may be larger than the rated capacity of the primary winding side.

In addition, the transformer 3 may be used only for a predetermined time with one of the secondary winding side and the tertiary winding side exceeding the rated capacity of the one.

Due to these characteristics, in the three-winding type transformer 3, the primary winding is connected to the system K, the secondary winding is connected to the secondary load 2a, and the tertiary winding is connected to the tertiary load 2b. The rated voltage on the secondary winding side and the rated voltage on the tertiary winding side are each lower than the rated voltage on the primary winding side, and the rated capacity on the secondary winding side and the rated voltage on the tertiary winding side are By making the sum of the rated capacities larger than the rated capacity of the primary winding side, unlike Patent Document 1, it is possible to respond to needs such as wanting to use an additional load such as a charger, and such needs can be met. Even if it corresponds to the above, there is no need to install separate power receiving and distribution equipment, so there is no need for extra costs such as installation costs ("meeting the need for additional loads" and "reducing costs").

In addition, a lighting load 2a1 and a power load 2a2 are connected to the secondary winding of the transformer 3, and a charger 2B for a vehicle such as an electric vehicle with a built-in storage battery, a power storage device 4, and a power generation device 5 are connected to the tertiary winding. By providing a panel housing 8 with a built-in system breaker 7a and a load breaker 7b, and a power distribution board 10 equipped with a transformer 3, the system K on the primary winding side can be connected via the power distribution board 10. It controls the flow of current between the lighting load 2a1 and power load 2a2 on the secondary winding side and the charger 2B, power storage device 4, and power generation device 5 on the tertiary winding side. It becomes possible to more highly and flexibly respond to needs such as the desire to use additional loads.
Furthermore, in the three-winding type transformer 3, the tertiary winding side to which the charger 2B is connected, or one of the secondary winding side and the tertiary winding side, exceeds its rated capacity for a predetermined time. By using only 1, it is possible to further ``meet the needs for additional load''.

By supporting the weight of the high voltage panel casing 8A containing the system breaker 7a and the weight of the low voltage panel casing 8B containing the load breaker 7b by the transformer 3, the power receiving and distribution panel in the power receiving and distribution system 1 is supported. 10 can be installed only by fixing the transformer 3, and the installation can be facilitated.
In addition, in order to support the high voltage panel casing 8A and the low voltage panel casing 8B by the transformer 3, the high voltage panel casing 8A is attached to the transformer 3 from above, and the low voltage panel casing 8B is attached to the high voltage panel casing 8A in plan view. By attaching it from one side and extending the lower end of the low voltage panel casing 8B to the bottom of the transformer 3, the installation area (or exclusive area in plan view ) can be achieved ("space saving"), and while making this "space saving", the internal volume of the low voltage panel casing 8B can be reduced by the amount that the low voltage panel casing 8B is allowed to hang down to the bottom of the transformer 3. (internal space) can be secured. Further, the hanging tool 3a may be provided at a position eccentric to one side of the transformer 3 in a plan view.

According to the power reception and distribution system, power reception and distribution board, and transformer according to the present invention, the sum of the rated capacities of the secondary and tertiary windings in a three-winding transformer can be made larger than the rated capacity of the primary winding. , ``meeting the need for additional load'' and ``reducing costs.''

1 is a schematic diagram illustrating a power receiving and distributing system, a power receiving and distributing board, and a transformer according to the present invention. 1 is a circuit diagram illustrating a power reception and distribution system, a power reception and distribution board, and a transformer. FIG. 2 is a side view showing a power distribution board and a transformer. It is a front view showing a power distribution board and a transformer. FIG. 4 is a cross-sectional view taken along the line AA of the high-voltage panel housing in the power distribution board shown in the side view of FIG. 3; FIG. 4 is a sectional view taken along line BB of the high-voltage panel housing in the power distribution board shown in the side view of FIG. 3; FIG. 4 is a cross-sectional view taken along the line CC of the high-voltage panel housing, low-voltage panel housing, and transformer in the power receiving and distribution board shown in the side view of FIG. 3; FIG. 4 is a cross-sectional view taken along the line DD of the high-voltage panel housing and the low-voltage panel housing in the power receiving and distribution board shown in the side view of FIG. 3; FIG. 3 is a plan view showing the top surface of a transformer in the power distribution board. (a) is a front view showing a partition plate between a high-voltage panel casing and a low-voltage panel casing in the power distribution board, and (b) is a front view showing a load breaker in the low-voltage panel casing in the power distribution board. It is a graph showing load sharing in a transformer, where (a) shows the load sharing between the secondary winding side and the tertiary winding side, and (b) shows the load sharing between the single-phase three-wire and three-wire windings on the secondary winding side. Shows the load sharing of phase 3 wires.

Embodiments of the present invention will be described below with reference to the drawings.
<Overall configuration of power reception and distribution system 1>
As shown in FIGS. 1 and 2, a power reception and distribution system 1 according to the present invention includes a load 2, which will be described later, and a transformer 3, which will be described later, and according to the present invention.
In the power receiving and distribution system 1, the load 2 consumes at least the power from the system K via the transformer 3.
The power reception and distribution system 1 includes a power storage device 4 described later and/or a power generation device 5 described later, a system side electric line 6a and a load side electric line 6b described below, a system breaker 7a and a load breaker 7b described below, and a power generation apparatus 5 described later. It may have a high-voltage panel casing 8A and a low-voltage panel casing 8B, or may include a power receiving and distribution board 10 according to the present invention, which will be described later.
In addition, when the power generation device 5 is a solar power generation device 5A described below, the power receiving and distribution system 1 may include a control device 20 described below for the solar power generation conversion unit 5Ab.

When the power reception and distribution system 1 has a power storage device 4 and/or a power generation device 5, the load 2 is the power from the grid K via the transformer 3, the power from the power storage device 4, and/or the power generation device 5. It may consume electricity.
In the present invention, "load 2 consumes power from system K via transformer 3, power from power storage device 4, and/or power from power generator 5" means that load 2 consumes power from system K via transformer 3, power from power storage device 4, and/or power from power generation device 5. This means that at least one of the power that has passed through the transformer 3, the power from the power storage device 4, and the power from the power generator 5 is consumed.

Here, in the present invention, "power from system K via transformer 3" refers to not only all of the power R from system K through transformer 3 (power received from system K (received power)) This means at least a portion of the electric power R.
Furthermore, in the present invention, "power from the power storage device 4" means not only all of the power (stored power) T output (discharged) from the power storage device 4, but also at least a part of the stored power T.
In the power receiving and distribution system 1, if the stored power T is 0 (zero) when the power storage device 4 is connected to the load 2, the connected load 2 consumes only the received power R. However, if the stored power T is already greater than 0 when the power storage device 4 is connected to the load 2 (the connection is made after the power storage device 4 has been charged with some power elsewhere), the load 2 2 consumes at least the stored power T, and may also consume the received power R if necessary.
Furthermore, in the present invention, "electric power from the power generation device 5" means not only all of the power (generated power) H output from the power generation device 5, but also at least a part of the power generated H.
In the power receiving and distribution system 1, when the generated power H of the power generating device 5 is 0 (zero), the load 2 consumes at least one of the above-mentioned stored power T and received power R. However, if the power generation H of the power generation device 5 is larger than 0, the load 2 will consume at least the power generation H and the stored power T, and if necessary, the received power R will also be consumed. Also good.

Here, the capacity, power, current, and voltage in the present invention may be values within a rated range, and in this case, they can be said to be rated capacity, rated power, rated current, and rated voltage.
These rated capacities can be said to be the limit values of electric power etc. compensated by the manufacturer for the safe use of electrical products.Furthermore, the ratings are the guarantees that safe and appropriate operation of the equipment or equipment is guaranteed. It can also be said that they are the limits and conditions for use.
Furthermore, when the current in the present invention is alternating current, the value of capacity (capacitance value), value of electric power (power value), value of current (current value), and value of voltage (voltage value) may be effective values. good.
In reality, under predetermined conditions or within a predetermined period of time, the transformer 3 may be used (operated) with a capacity exceeding its rated capacity, or the transformer 3, the grid side electric line 6a, and the load side electric line 6b may be etc., a current exceeding the rated current may flow.

<Load 2, lighting load 2a1, power load 2a2>
As shown in FIGS. 1 and 2, the load 2 is a load (load equipment) that consumes at least the received power R received from the system K described above. In other words, even if the value of power consumption (capacity) of load 2 is greater than the value of received power R that power receiving and distribution system 1 receives from grid K (only a part of the power consumption of load 2 is covered by received power R), Even) Good.
The load 2 is, for example, a car dealership, a gas station, etc., a rental car store (rental car shop), a charger 2B (described later) in a factory or workshop, or a power source for electric/electronic equipment. It may include the equipment and equipment used (general lighting loads 2a1 such as incandescent lamps, fluorescent lamps, mercury lamps (lighting equipment), general power loads 2a2 such as air conditioners, motors, pumps, etc.), and the factory / work place itself. May contain.
In addition, load 2 includes offices of corporations, organizations, individuals, public offices, unions, etc., residences, stores, warehouses, garages, parking lots, bicycle parking lots, school buildings, auditoriums, gymnasiums, research facilities, hospitals, and clinics. , may include equipment that uses electricity such as electrical and electronic equipment in inns, hotels, theaters, movie theaters, stadiums, baseball stadiums, etc., as well as offices of companies, etc., or combinations of these. may be included.
Such a load 2 includes a secondary load 2a and a tertiary load 2b, which will be described later.

<Secondary side load 2a, tertiary side load 2b, charger 2B>
As shown in FIGS. 1 and 2, the secondary load 2a is the load 2 connected to the secondary winding of the transformer 3, which will be described later, and the tertiary load 2b is the load 2 connected to the tertiary winding of the transformer 3, which will be described later. This is a load 2 connected to the winding.
In one power reception and distribution system 1, the number of secondary loads 2a and tertiary loads 2b is not particularly limited, but may be one or more, for example.
The secondary load 2a may include the above-mentioned lighting load 2a1, the power load 2a2, etc., and the tertiary load 2b may include the charger 2B described below.
Contrary to the above, the secondary load 2a may include the charger 2B, and the tertiary load 2b may include the lighting load 2a1, the power load 2a2, etc. The lighting load 2a1, the power load 2a2, the charger 2B, etc. may be included in only one or both of the side load 2a and the tertiary load 2b.
In particular, the charger 2B will be explained in detail below.

The charger 2B may have any configuration such as a quick charger, a normal charger, or an ultra-fast charger. Note that the tertiary side load 2b may be only the charger 2B, may not include the charger 2B, or may be a load equipment other than the charger 2B and the charger 2B.
Here, the "charger 2B" in the present invention refers to an installed charging device used for charging vehicles with built-in batteries (storage batteries) such as electric vehicles (EVs), plug-in hybrid vehicles, and electric motorcycles. A charging facility is also called a charging station, charging station, charging spot, etc. In addition to vehicles, the charger 2B is a charging device or charging facility used to charge communication devices such as smartphones and mobile phones with built-in batteries (storage batteries), portable PCs (personal computers), and electrical products. It's okay.
The output from the charger 2B to the electric vehicle or the like may be a direct current or an alternating current, and it does not matter if only one or both can be output.
On the other hand, for electric vehicles, etc., direct current or alternating current may be input via a plug, etc., or only one or both may be input. .
Note that the charger 2B is configured to perform quick charging when the output from the charger 2B is a direct current, and to perform normal charging when the output from the charger 2B is an alternating current. Also good.
The charger 2B has a power storage unit that stores the power from the power storage device 4, the received power R, etc., and a conversion unit (AC) that converts the current from the power storage device 4 from AC to DC or from DC to AC. /DC converter, DC/AC inverter (DC/AC converter), DC/DC converter, etc.).

In one power reception and distribution system 1, the number of chargers 2B is not particularly limited, but may be one or more, for example.
The capacity of the charger 2B may be 30 kW or 50 kW, 100 kW or 180 kW (90 kW x 2), or 200 kW or more.
The charging time of charger 2B depends on the capacity of the battery of the electric vehicle, etc., but if it is a quick charger, it will take about 10 minutes, about 20 minutes, about 30 minutes, or about 40 minutes until the battery is fully charged. or more than 10 minutes and less than 120 minutes, for example, about 5 hours, about 7 hours, about 8 hours, about 10 hours, about 12 hours, about 14 hours with a normal charger. , about 24 hours, 2 hours or more and 30 hours or less, etc., or an ultra-fast charger (for example, one that has a power storage unit and outputs the power stored in the power storage unit at a high voltage). For example, it may be about 3 minutes, about 5 minutes, about 10 minutes, or more than 1 minute and less than 10 minutes.
Note that the capacity of batteries for electric vehicles and the like is not particularly limited, but may be, for example, 100 kWh or 180 kWh (90 kWh x 2), 50 kWh or more and 2000 kWh or less, preferably 70 kWh or more and 1500 kWh or less, and more preferably 90 kWh or more and 1000 kWh or less. It may be.

<Transformer 3>
As shown in FIGS. 1 to 4, 9, and 11, the transformer 3 transforms the above-mentioned alternating current from the system K into an alternating current of a voltage suitable for the above-mentioned load 2, and is so-called. It's trance. Note that "trans" is an abbreviation for "transformer".
The transformer 3 is connected between the load 2 and the system K, and is a three-winding type transformer including a primary winding, a secondary winding, and a tertiary winding.
The transformer 3 has a primary winding connected to the system K, a secondary winding connected to the above-mentioned secondary load 2a, and a tertiary winding connected to the above-mentioned tertiary load 2b. It is connected to the.
It can be said that the transformer 3 supports the weight of a high voltage panel casing 8A, which will be described later, and the weight of a low voltage panel casing 8B, which will be described later, and may also include a hanging tool 3a, which will be described later.

The transformer 3 has no particular restrictions on the connection system of its primary to tertiary windings, but for example, the primary winding on the system K side is a star connection (Y connection), and the secondary side load 2a The secondary winding, which is the tertiary load 2b, has a triangular connection (Δ connection) (that is, the primary side and the secondary side are connected in the order of Y-Δ), and the tertiary winding, which is the tertiary side load 2b, has a star connection (Y-Δ connection). In other words, Y-Y connection, Δ-Y connection, Δ-Δ It may be a Y-Δ connection, a Δ-Y connection, or a Δ-Δ connection in the order of primary and tertiary.
In addition, when the connection method of the secondary winding is Δ connection, two outputs are provided from this Δ connection: single-phase 3-wire (1φ3W) and three-phase 3-wire (3φ3W), and these single-phase 3-wire It may be possible to use wire and three-phase three-wire at the same time, and in addition, only one single-phase two-wire (1φ2W) output may be provided, or instead of the single-phase three-wire or three-phase three-wire described above. Alternatively, in addition to the single-phase three-wire and three-phase three-wire, a total of three wires may be provided so that they can be used simultaneously. Hereinafter, the Δ connection of the secondary winding will mainly be described assuming that it is provided so that single-phase three-wire and three-phase three-wire can be used simultaneously.

In the transformer 3, the rated voltage of the secondary winding side and the rated voltage of the tertiary winding side (together, the rated voltage of the load 2 side) are equal to the rated voltage of the primary winding side (the rated voltage of the system K side). The voltage is lower than the rated voltage), and it can be said that the transformer 3 is a step-down transformer.
The rated voltage of the primary winding side, which is the system K side, is not specifically limited, but for example, it may be high voltage 6000V or 6600V, extra high voltage 22000V, etc., or 210V or 200V, etc. A low voltage such as 105V or 100V may be used.
The rated voltage of the secondary winding side, which is the secondary load 2a, is not particularly limited to a specific value, but for example, it may be 105V or more and 210V or less, 105V, 210V, 100V, etc., or 70V or more and 260V or less. , preferably 80V or more and 240V or less, more preferably 90V or more and 220V or less.
The rated voltage on the tertiary winding side, which is the tertiary load 2b, is not specifically limited, but for example, it may be 242V or more and 420V or less, 242V, 420V, 440V, etc., or 90V or more and 1000V or less. , preferably 100V or more and 800V or less, more preferably 150V or more and 600V or less.
In the transformer 3, the difference between the rated voltage on the load 2 side, which is the secondary and tertiary winding side, and the rated voltage on the system K side, which is the primary winding side, is not particularly limited, but may be, for example, 6180V, It may be 6358V, 6390V, 6495V, etc., or more than 0V and less than 22000V, preferably more than 1000V and less than 6600V, more preferably more than 5000V and less than 6550V.

In the transformer 3, the sum of the rated capacity on the secondary winding side and the rated capacity on the tertiary winding side is larger than the rated capacity on the primary winding side. Note that the unit of the rated capacity of each winding of the transformer 3 is VA.
The rated capacity of the primary winding side, which is the system K side, is not particularly limited to a specific value, but may be, for example, 200 kVA, or 5 kVA or more and 2000 kVA or less, preferably 30 kVA or more and 1500 kVA or less, and more preferably 50 kVA. It may be more than 1000 kVA or less.
The rated capacity of the secondary winding side, which is the secondary side load 2a, is also not specifically limited, but may be, for example, 100 kVA, or more preferably 2 kVA or more and 1000 kVA or less, preferably 15 kVA or more and 750 kVA or less, and more preferably. may be 25 kVA or more and 500 kVA or less.
The rated capacity of the tertiary winding, which is the tertiary load 2b, is not particularly limited to a specific value, but may be, for example, 200 kVA, or 5 kVA or more and 2000 kVA or less, preferably 30 kVA or more and 1500 kVA or less, and more preferably 30 kVA or more and 1500 kVA or less. may be 50 kVA or more and 1000 kVA or less.
There is no particular limitation on the magnitude relationship between the rated capacity of the secondary winding side and the rated capacity of the tertiary winding side, and the rated capacity of the tertiary winding side is larger than the rated capacity of the secondary winding side. It may be the same, or it may be the opposite, or it may be substantially the same.
Moreover, there is no particular limitation on the magnitude relationship between the rated capacity of the secondary winding side and the rated power consumption (rated capacity) of the secondary side load 2a mentioned above, and the rated capacity of the secondary winding side is It may be larger than the rated power consumption of the load 2a, or vice versa, or substantially the same.
Furthermore, there is no particular limitation on the magnitude relationship between the rated capacity of the tertiary winding side and the rated power consumption (rated capacity) of the tertiary side load 2b mentioned above, and the rated capacity of the tertiary winding side is It may be larger than the rated power consumption of the load 2b, or vice versa, or substantially the same.

As described above, the transformer 3 has a rated capacity of 2 and 3 because the sum of the rated capacity of the secondary winding and the rated capacity of the tertiary winding is greater than the rated capacity of the primary winding. Load sharing may be performed on the wire side. For example, in Fig. 11(a), the rated capacity of the primary winding side is 200 kVA, the rated capacity of the secondary winding side is 100 kVA, and the rated capacity of the tertiary winding side is 200 kVA. It is a graph showing the relationship between load sharing between the secondary winding side and the tertiary winding side in the transformer 3 whose rated capacity is 200 kVA.
If we explain this figure 11(a) in detail, in transformer 3, the secondary winding side is used at 100 kVA, which is the same as the rated capacity (in detail, single-phase 3-wire is used at 20 kVA, and three-phase 3-wire is used at 80 kVA at the same time). (e.g., when used simultaneously so that the ratio of single-phase 3-wire capacity to 3-phase 3-wire capacity is 1:4), the tertiary winding side must be used at 80 kVA, which is smaller than the rated capacity. (See point X in FIG. 11(a)). Incidentally, it can be said that the capacity of at least 80 kVA is secured on the tertiary winding side to which the charger 2B etc. are mainly connected, regardless of the capacity used on the secondary winding side. On the other hand, if the tertiary winding side is used at 200 kVA, which is the same as the rated capacity, the secondary winding side is used at 0 kVA, which is overwhelmingly smaller than the rated capacity (of course, both single-phase 3-wire and three-phase 3-wire (see point Y in FIG. 11(a)). In addition, if the secondary winding side and the tertiary winding side are not used at the same capacity as their respective rated capacities (neither point X nor point Y in Fig. 11(a)), Each is used in the load sharing shown on the line segment (line segment XY) connecting point X and point Y in a).
Here, in the above case, the rated capacity of the secondary winding side is 100 kVA and the rated capacity of the tertiary winding side is 200 kVA, but the case where each rated capacity is a value other than these is also mentioned. Then, if the ratio of the rated capacity on the secondary winding side to the rated capacity on the tertiary winding side is 1:2, at point X in FIG. 11(a), regardless of the specific values, The ratio of the capacity on the secondary winding side and the rated capacity on the tertiary winding side is 100:80, and at point Y in Fig. 11(a), the rated capacity on the secondary winding side and the rated capacity on the tertiary winding side are 100:80. The ratio of the rated capacities on both sides may be 0:100. In addition, the relationship of load sharing between the secondary winding side and the tertiary winding side is that if one of the secondary winding side and the tertiary winding side is used for a predetermined period of time until it reaches its rated capacity, The other of the secondary winding side and the tertiary winding side may be used only for the predetermined time below its rated capacity, and furthermore, the tertiary winding side to which at least the charger 2B is connected is Even if the winding side is used to its rated capacity for a specified period of time, the capacity is at least 0 kVA (for example, 20% to 80% of the rated capacity of the tertiary winding side, preferably 30% to 60% of the rated capacity of the tertiary winding side) (40%, etc.)) may be shared in such a way as to ensure that. Note that if the side to which at least the charger 2B is connected is the secondary winding side, the above-mentioned relationship will be reversed.
In addition, the single-phase 3-wire and three-phase 3-wire on the secondary winding side may also perform load sharing. For example, in FIG. 11(b), the rated capacity of the entire secondary winding is 100 kVA, It is a graph showing the relationship of load sharing between single-phase three-wire and three-phase three-wire that can be used simultaneously when the voltage of single-phase three-wire is 105V or more and 210V.
If we explain this Fig. 11(b) in detail, if the single-phase 3-wire is used at 60 kVA on the secondary winding side of the transformer 3, the 3-phase 3-wire will be used at 0 kVA (Fig. 11 ( (see point x in b)). On the other hand, when three-phase three-wire is used at 100 kVA, single-phase three-wire is used at 0 kVA (see point y in FIG. 11(b)). In addition, for single-phase 3-wire and three-phase 3-wire, which are mainly connected to lighting load 2a1 and power load 2a2, one side uses the full rated capacity (100kVA) of the secondary winding, and the other uses 0kVA by that amount. It can be said that this is allowed. Also, if three-phase three-wire is used at 80kVA, single-phase three-wire will be used at 20kVA. (Conversely, if one-phase three-wire is used at 20kVA, three-phase three-wire will be used at 80kVA. ) (see point z in FIG. 11(b)). In addition, if single-phase 3-wire or three-phase 3-wire is not used with the same capacity as the rated capacity of the secondary winding side (neither point x nor point y in Figure 11(b)), , in the load sharing shown on the line segment connecting points x and point z (line segment xz) and on the line segment connecting point z and point y (line segment zy) in Figure 11(b). , each used.
Here, in the above case, the rated capacity on the secondary winding side is 100 kVA, but if we also mention the case where the rated capacity is other than that, the point x in Fig. 11(b) , the ratio of the single-phase three-wire capacity to the three-phase three-wire capacity is 60:0, and at point y in Figure 11(b), the single-phase three-wire capacity and three-phase three-wire capacity are 60:0. Even if the ratio of the used capacity of the lines is 0:100 and the ratio of the used capacity of single-phase 3-wire to the used capacity of 3-phase 3-wire is 20:80 at point z in Fig. 11(b), good. In addition, the relationship of load sharing between single-phase 3-wire and three-phase 3-wire is that the three-phase 3-wire, to which at least the power load 2a2 is connected, allows the full rated capacity of the secondary winding to be used, while the The single-phase three-wire to which at least the load 2a1 is connected has a three-phase three-wire capacity of 0 kVA, and the full rated capacity of the secondary winding side may not be used, and roughly speaking, It can be said that the load is shared in such a way that the usage capacity of three-phase three-wire is larger than the usage capacity of single-phase three-wire.

The shape of the transformer 3 in plan view may be approximately square or rectangular (in other words, it may have four side surfaces), but radiation fins may be provided on these four side surfaces in an outwardly protruding manner. The protruding length of the radiation fins may be approximately the same on each side, or the protruding length of one of the four side surfaces may be shorter than the protruding length of the other three sides. Alternatively, the radiation fins may not be provided on only one side. By arranging the side surface of the radiation fin, such as a short projecting length, to face the rear surface of a low-voltage panel housing 8B, which will be described later, at a predetermined distance, the power distribution board 10 can be made more compact, and the transformer 3 It becomes easier to secure a space (gap) between the transformer 3 and the low-voltage panel housing 8B, and it becomes easier to remove rust, dirt, etc. that accumulate between the transformer 3 and the low-voltage panel housing 8B.
Further, the transformer 3 may be provided with a grounding terminal, a cross-contact prevention plate, and the like.
Further, the transformer 3 may be an oil-immersed transformer (self-cooled type, air-cooled type, water-cooled type, etc.) or a dry type transformer (self-cooled type, air-cooled type, water-cooled type, etc.). . In the following, the transformer 3 will be mainly described as an oil-immersed transformer. In this case, an oil drain valve may be provided at the bottom of the transformer 3.

<Usage exceeding the rated capacity of one of the secondary and tertiary windings of the transformer 3 for a predetermined period of time>
As for the transformer 3, one of the secondary winding side and the tertiary winding side may be used for a predetermined period of time exceeding the rated capacity of the one side.
This is because, as mentioned above, if the transformer 3 is an oil-immersed transformer, even if it is used beyond its rated capacity, the oil in the transformer 3 will quickly reach its temperature within a predetermined period of time. This is because the temperature does not rise, and even if the transformer 3 is of a water-cooled type, the temperature of the water does not rise immediately, so it can be said that the same is true.
Here, the predetermined time in this case is not particularly limited, but for example, it may be 1 hour or 30 minutes, 1 hour 30 minutes, 2 hours, 4 hours, etc., 10 minutes or more and 6 hours or less, Preferably, the period may be 20 minutes or more and 5 hours or less, and the percentage exceeding the rated capacity is not particularly limited, but may be, for example, 125%, 120%, 130%, or greater than 100% and 140%. Below, preferably it may be 110% or more and 135% or less. In this case, the specific value of the ratio exceeding the predetermined time and rated capacity is not particularly limited, but for example, if the rated capacity of the secondary winding side or the tertiary winding side is 200 kVA (100%), For example, the actual capacity may be operated (used) for one hour at 125 kVA (125%).

In addition, before using one of the secondary and tertiary windings beyond the rated capacity for a predetermined time, it may be used continuously (continuous operation) below the rated capacity, and the percentage below this rated capacity Although there is no particular limitation, for example, it may be 80%, 70%, 90%, etc., it may be 60% or more and 100% or less, preferably 65% or more and 95% or less, and the period of continuous use may also be particularly limited. Although there is no limitation, it may be, for example, 24 hours, 12 hours, 36 hours, etc., or 6 hours or more and 48 hours or less, preferably 9 hours or more and 42 hours or less.
By making it possible to use the rated capacity of one of the secondary and tertiary windings for a predetermined time, for example, in a power distribution system 1 having a plurality of chargers 2B, 2B can be used at the same time, and users can use the transformer 3, the power receiving and distribution system 1, and the power receiving and distribution board 10 with greater peace of mind.
Therefore, in the power reception and distribution system 1, the transformer 3 may be used only for a predetermined time when at least the tertiary winding side to which the charger 2B is connected exceeds its rated capacity.

<Top surface (top plate) 3A of transformer 3>
Although there is no particular limitation on the specific configuration of the upper surface 3A of the transformer 3 described above, for example, as shown in FIG. 9, the upper surface 3A is approximately rectangular in plan view, and ~The terminals of the tertiary winding may be provided in an upwardly projecting manner, and the number of terminals in each of the primary to tertiary windings is at least three or more, for example, the terminals of the primary winding are High-voltage side terminals (high-voltage terminal 3H), with three (U terminal, V terminal, W terminal) or four (U terminal, V terminal, W terminal, and O terminal pulled out from the midpoint of the winding). be.
The terminals of the secondary winding are the terminals on the low voltage side (low voltage terminal 3L or 3L1), and if there are single-phase 3-wire and three-phase 3-wire, there are four terminals (the u terminal for single-phase 3-wire, the winding These are the o terminal and v terminal pulled out from the midpoint of the line, and the three-phase three-wire is the u terminal, v terminal, and w terminal, and the u terminal and v terminal are also used as the u terminal, v terminal, w terminal, and o terminal. (total of 4), or if there is only single-phase 3-wire, 3 (u terminal, o terminal, v terminal), and if only 3-phase 3-wire is available, 3 (u terminal, v terminal, w terminal) terminal).
The terminals of the tertiary winding are also low voltage side terminals (low voltage terminal 3L or 3L2), and there are three (a terminal, b terminal, c terminal) or four (a terminal, b terminal, c terminal and , the n terminal drawn out from the midpoint of the winding).

There are no particular limitations on the arrangement of the terminals of these primary to tertiary windings, but for example, if the transformer 3 supports the weight of the high voltage panel casing 8A and the weight of the low voltage panel casing 8B (especially , the high voltage panel casing 8A is attached to the transformer 3 from above, the low voltage panel casing 8B is attached to the high voltage panel casing 8A from one side in plan view, and the lower end of the low voltage panel casing 8B extends to the bottom of the transformer 3. ), the terminals of the secondary winding and the terminals of the tertiary winding are arranged in a line approximately along one side (for example, the front side) in plan view of the top surface 3A. The terminals on one side in plan view can also be said to be terminals on the load side (low voltage side).
Further, the terminals of the primary winding may be arranged in a line approximately along the other side (for example, the rear side) in the upper surface 3A in the plan view, which is opposite to the one side in the plan view. , these terminals on the other side in plan view can also be said to be terminals on the load side (high voltage side).
In addition, an oil level thermometer or the like may be provided on the upper surface 3A.

<Hanging tool 3a, etc.>
As shown in FIG. 3, the hanging tool 3a is a crane attached to the end of a wire rope when the transformer 3 itself or the entire power distribution board 10 is suspended by a crane or the like for transportation, loading, installation, etc. This is the part for hooking the hook itself, slinging wire, rings, etc.
The specific structure of the hanging tool 3a is not particularly limited, but may be, for example, hook-shaped or ring-shaped.
The position where the hanging tool 3a is provided may be at least a position eccentric to one side in a plan view of the transformer 3, and this eccentric distance may be determined depending on the weight of a cantilevered low-voltage panel casing 8B, which will be described later. It can be said that the distance is such that the entire power receiving and distribution board 10 becomes approximately horizontal when it is suspended.

Two or more hanging tools 3a may be provided for one transformer 3, and for example, one side of the upper surface 3A mentioned above and the other side in a plan view (front side and rear side) They may be provided in a pair on the left and right in the vicinity of the remaining two sides (the left side and the right side) other than the side of (near the center, etc.) is fine.
Further, the hanging tool 3a may be provided at a position other than the position eccentric to one side of the transformer 3 in plan view, for example, it may be provided at a position not eccentric to one side in plan view (such as a substantially central position in the front-rear direction). However, the reference numeral 3a' in FIG. 3 is used to indicate the hanging tool in the non-eccentric position.
The transformer 3 described so far may be heavier than the weight of the panel casing 8 (the sum of the weight of the high voltage panel casing 8A and the weight of the low voltage panel casing 8B), which will be described later. The specific value of the weight is not particularly limited, but may be, for example, 1000 kg or more and 2000 kg or less, preferably 1300 kg or more and 1800 kg or less, and more preferably 1400 kg or more and 1700 kg or less (such as 1550 kg).

<Power storage device 4>
As shown in FIGS. 1 and 2, the power storage device 4 is a device that stores power from the above-mentioned system K via the transformer 3, power (generated power) H from the power generation device 5 described later, etc. .
The power storage device 4 is, for example, a storage battery (battery) such as a lead storage battery, a lithium ion storage battery, a nickel-hydrogen storage battery, a nickel-cadmium storage battery, or a water electrolysis device using the power generation H from the power generation device 5. In addition to storing the generated hydrogen and extracting electricity when necessary using fuel cells, etc., it can also be used to store electricity as kinetic energy in flyholes, store electricity as potential energy in pumped water, and use capacitors. It is also possible to use a device that directly stores electricity as electrical energy.
The power storage device 4 is connected to the above-mentioned tertiary winding of the transformer 3 and the tertiary load 2b via a load-side electrical circuit 6b (tertiary load-side electrical circuit 6b2), which will be described later. The stored power T may be consumed by the tertiary load 2b via the load-side electric line 6b, or may be further consumed by the secondary load 2a via the transformer 3.

In one power reception and distribution system 1, the number of power storage devices 4 is not particularly limited, and may be one or more than one, for example.
The stored power T of the power storage device 4 is also not particularly limited, but is, for example, 50 kW, 100 kW, 200 kW (100 kW x 2), 30 kW or more and 2000 kW or less, preferably 50 kW or more and 1500 kW or less, and more preferably 70 kW. It may be greater than or equal to 1000 kW or less.
The storage power amount (capacity) T of the power storage device 4 is also not particularly limited, but is, for example, 100 kWh, 200 kWh, 390 kWh (195 kWh x 2), 50 kWh or more and 2000 kWh or less, preferably 100 kWh or more and 1500 kWh or less, More preferably, it may be 200 kWh or more and 1000 kWh or less.
Note that the stored power T of the power storage device 4 may be larger than the power consumption of the tertiary side load 2b and the like described above. Further, the power storage device 4 may have a self-sustaining function.

<Electricity storage conversion unit 4a>
As shown in FIG. 1, since the storage of electricity in the electricity storage device 4 and the discharge from the electricity storage device 4 described above are performed using direct current, there is a gap between the electricity storage device 4 and the tertiary load 2b. , even if the power storage converter 4a that converts the alternating current from the tertiary load side electric circuit 6b2 into a direct current or converts the DC current from the power storage device 4 into an alternating current to the tertiary load side electric circuit 6b2 is connected. good.
The power storage conversion unit 4a may include a converter that converts the alternating current from the tertiary load side electric circuit 6b2 into a direct current, and an inverter that converts the direct current from the power storage device 4 into an alternating current. It is also possible to include a controller that controls the voltage and frequency of alternating current that is converted by the converter or inverter, an air circuit breaker (ACB), and the like. The autonomous operation of the power storage device 4 may be controlled by the controller of the power storage conversion unit 4a.
Note that the power storage conversion unit 4a is also called a power conditioner (abbreviation for power conditioner).

In one power receiving and distribution system 1, the number of power storage converters 4a is not particularly limited, but for example, it may be one or more, and may be the same as the number of power storage devices 4 described above. I do not care.
The storage conversion power (capacity) T' that can be converted by the storage converter 4a is also not particularly limited, but is, for example, 50 kW, 100 kW, 200 kW (100 kW x 2), or 30 kW or more and 2000 kW or less, preferably 100 kW. It may be greater than or equal to 1,500 kW, and more preferably greater than or equal to 200 kW and less than or equal to 1,000 kW.
Note that the stored converted power T' of the power storage conversion unit 4a may be smaller than the stored power T of the power storage device 4 described above, or may be larger than the power consumption of the tertiary side load 2b and the like described above.
In addition, the power storage device 4 may be connected to the secondary winding of the transformer 3 via a secondary load-side electric line 6b as a storage battery auxiliary device 4'.

<Power generation device 5>
As shown in FIGS. 1 and 2, the power generation device 5 may have any configuration as long as it generates electricity, and the power generation device 5 connects the load-side electric line 6b (tertiary load-side electric line 6b2) mentioned above to be described later. The power generation device 5 is connected to the tertiary winding of the transformer 3 and the tertiary load 2b via the load line 6b. It may be consumed by the secondary load 2a via the transformer 3.
The power generation device 5 can be used, for example, to generate electricity using solar power, wind power, hydroelectric power, geothermal power, solar power, atmospheric heat or other heat existing in the natural world, biomass (organic matter derived from animals and plants and used as an energy source). It may also be a device that generates electricity using a device that can
In addition, the power generation device 5 may generate power using ocean temperature difference, wave power, tidal current (ocean current), or tide.

In one power reception and distribution system 1, the number of power generation devices 5 is not particularly limited, and may be one or more than one, for example.
The generating power (capacity) H of the power generation device 5 is also not particularly limited, but for example, it may be 50 kW, 100 kW, 100 kW or more and 200 kW or less, 200 kW or more and 400 kW or less (100 kW or more and 200 kW or less x 2), or 30 kW. The power may be greater than or equal to 2000 kW and less than or equal to 2000 kW, preferably greater than or equal to 100 kW and less than or equal to 1500 kW, and more preferably greater than or equal to 200 kW and less than or equal to 1000 kW.
Note that the power generation H of the power generation device 5 may be approximately the same as the power consumption of the above-mentioned tertiary side load 2b, etc., or may be larger.
The following will particularly describe the solar power generation device 5A that performs solar power generation.

<Solar power generation device 5A>
As shown in FIG. 1, the solar power generation device 5A includes a solar cell 5Aa and a solar power conversion section 5Ab that converts direct current from the solar cell 5Aa into alternating current.
In addition, the solar power generation device 5A includes a pyranometer that measures solar radiation intensity, a switchboard that accommodates the solar power conversion unit 5Ab and the power transmission unit, an air conditioner that performs air conditioning in this switchboard, a solar cell 5Aa, a connection box, etc. It may also include a current collecting section that collects the direct current from the solar power generation conversion section 5Ab and sends it to the solar power generation conversion section 5Ab.
There may be a plurality of solar cells 5Aa in the solar power generation device 5A, and these plurality of solar cells 5Aa may be connected in series to form a solar cell string.
The solar power generation device 5A may include a connection box in which a plurality of solar cell strings are connected in parallel, and there may be a plurality of such connection boxes.

<Solar cell 5Aa>
As shown in FIG. 1, each solar cell 5Aa generates DC power between the positive electrode (+ electrode) and the negative electrode (- electrode) by being irradiated with light, and the generated power is 100 W or more. It is 300W or less (for example, 250W, etc.).
The solar cell 5Aa is usually panel-shaped, and the amount of power generated varies depending on the angle at which it is installed (the angle from the horizontal direction to the panel of the solar cell 5Aa, hereinafter referred to as the installation angle) (for example, the installation angle θ = 30 If the amount of power generated at θ is 100%, it is about 99% when θ=20°, about 95% when θ=10°, and about 90% when θ=0°).
Also, among the plurality of solar cells 5Aa, the + pole of one solar cell 5Aa is connected to the − pole of another solar cell 5Aa, and the − pole of another solar cell 5Aa is connected to the + pole of another solar cell 5Aa. Hereafter, this process is repeated to connect a plurality of solar cells 5Aa (for example, 5 to 20 solar cells) in series to form one solar cell string.

In this way, the voltage between the + pole (power output end) and the - pole (ground end) of the entire solar cell string in which a plurality of solar cells 5Aa are connected in series is the direct current generated by each solar cell 5Aa. It is the sum of voltages, and varies depending on the weather, time of day, etc., but is between 200V and 1000V.
The power output from the power output end of the solar cell string is the sum of the power of each solar cell 5Aa, and is 500W or more and 6000W or less (for example, if 14 solar cells 5Aa with an output power of 250W are connected, 3500W = 3.5kW).
The plurality of solar cell strings described above (for example, 5 to 15 solar cell strings) are connected in parallel to one connection box.
Therefore, the voltage between the power output end (+ pole) and the ground end (- pole) of each solar cell string is the same, and is about 0.5 kW or more and 6 kW or less, as described above.
However, since the current of multiple solar cell strings flows into one junction box, the power collected in the junction box is 2.5 kW or more and 90 kW or less (for example, if the junction box is connected to a solar cell with an output power of 3.5 kW) If six battery strings are connected, the output is 21 kW, and if 12 battery strings are connected, the output is 42 kW).
Therefore, in the case of a solar power generation device 5A having multiple connection boxes, the solar power generation power HA may be 50 kW or 100 kW, 100 kW or more and 200 kW or less, or 200 kW or more and 400 kW or less (100 kW or more and 400 kW or less), as described above. 200 kW or less x 2), 30 kW or more and 2000 kW or less, preferably 100 kW or more and 1500 kW or less, and more preferably 200 kW or more and 1000 kW or less.

<Solar power conversion unit 5Ab>
As shown in FIG. 1, since the output from the solar cell 5Aa described above is performed as a direct current, the direct current from the solar cell 5Aa is connected between the solar cell 5Aa and the high power circuit 4. A photovoltaic power conversion unit 5Ab that converts into alternating current to the high power circuit 4 may be connected.
The photovoltaic power conversion unit 5Ab may include an inverter or the like that converts the direct current from the solar cell 5Aa into alternating current, and may also include a controller that controls the voltage and frequency of the alternating current that this inverter converts, and an air conditioner. It does not matter if it is equipped with an intermediate circuit breaker (ACB), etc.
Note that the solar power conversion unit 5Ab is also called a power conditioner (abbreviation for power conditioner).

In one power reception and distribution system 1, the number of solar power generation conversion units 5Ab is not particularly limited, but for example, it may be one or more, one for each solar power generation device 5A. It doesn't matter if it exists.
There is no particular limitation on the power H' that can be converted by the solar power conversion unit 5Ab (solar power conversion power, capacity), but for example, it may be 10 kW, 30 kW, 50 kW, 62.5 kW, 100 kW (50 kW), etc. x2), 125 kW (62.5 kW x 2), or 5 kW or more and 1000 kW or less, preferably 10 kW or more and 750 kW or less, and more preferably 20 kW or more and 500 kW or less.
Note that the generated converted power H' of the photovoltaic power conversion unit 5Ab may also be approximately the same as the power consumption of the above-mentioned tertiary side load 2b, etc., or may be larger.
Furthermore, the generated converted power H' of the solar power conversion unit 5Ab is smaller than the solar generated power HA as the solar power generation device 5A described above (in other words, the solar generated power HA is smaller than the generated converted power H'). In this case, it can be said that the solar cell 5Aa is overloaded with respect to the solar power generation converter 5Ab, and if it is overloaded, the power from the solar power generation device 5A is used to reduce the tertiary side load 2b. It can also be said that it becomes easier to supply almost all of the power consumption.

<System side electric line 6a, load side electric line 6b, etc.>
As shown in FIGS. 1 to 4 and 7, the system-side electric line 6a is an electric line that connects the system K and the transformer 3 described above.
Further, the load-side electric line 6b is an electric line that connects the above-mentioned transformer 3 and the above-mentioned load 2, and more specifically, it connects between the transformer 3 and the above-mentioned secondary side load 2a. The electrical path is a secondary load-side electrical path 6b1, and the electrical path that connects the transformer 3 and the above-mentioned tertiary-side load 2b is a tertiary load-side electrical path 6b2.
In addition, the "electrical path" in the present invention is one that conducts electricity, and includes conductors such as copper, aluminum, silver, gold, and nichrome, cables in which these conductors are covered with insulators, and general electric wires. .

It can be said that the voltage in each of the electric lines 6a, 6b1, and 6b2 is the same as the voltage on the first to third winding sides of the transformer 3 described above. The voltage on the winding side (so to speak, the voltage of the system K), the voltage on the secondary load side electric line 6b1 is the voltage on the secondary winding side of the transformer 3, and the voltage on the tertiary load side electric line 6b2 is , the voltage on the tertiary winding side of the transformer 3.
The current conducted in the system side electric circuit 6a and each of the load side electric circuits 6b1 and 6b2 may be a three-phase three-wire (3φ3W) AC of 60Hz or 50Hz, or a single-phase three-wire (1φ3W) or single current. An alternating current such as a two-phase wire (1φ2W) may also be used.

<Each circuit breaker such as the system breaker 7a and the load breaker 7b>
As shown in FIGS. 1 to 5, 7, and 10(b), the power receiving and distributing system 1 and the power receiving and distributing board 10 include a system breaker 7a and a load breaker 7b, which will be described later. 7c, a power storage auxiliary circuit breaker 7c', and a power generation circuit breaker 7d.
The system breaker 7a is a circuit breaker capable of interrupting the above-mentioned system-side electric circuit 6a, and the load-side circuit breaker 7b is a circuit breaker capable of interrupting the above-mentioned load-side electric circuit 6b. For example, the circuit breaker capable of interrupting the secondary load side circuit 6b1 described above is the secondary load circuit breaker 7b1, and the circuit breaker capable of interrupting the tertiary load circuit 6b2 described above is the tertiary load circuit breaker 7b2. be.
In addition, to explain the secondary load breaker 7b1 in more detail, among the secondary load side electric circuits 6b1, especially the electric line connecting between the secondary winding of the transformer 3 and the lighting load 2a1 (lighting load side electric circuit (general The circuit breaker capable of interrupting the electrical circuit (lighting load side electrical circuit) 6b11) is the electrical lighting load circuit breaker (general electrical lighting load circuit breaker) 7b11. A circuit breaker capable of interrupting the load-side electrical circuit (general power load-side electrical circuit 6b12) is a power load circuit breaker (general power load circuit breaker) 7b12.
Further, the power storage circuit breaker 7c is a circuit breaker capable of interrupting the electrical circuit between the above-mentioned tertiary load-side electrical circuit 6b2 and the electrical storage device 4, and the power generation circuit breaker 7d is a circuit breaker capable of interrupting the electrical circuit between the above-mentioned tertiary load-side electrical circuit 6b2 and the power generating device. This is a circuit breaker that can interrupt the electrical circuit between 5 and 5.
In addition, if a charger 2B or a storage battery auxiliary device 4' is connected to the secondary winding of the transformer 3, an electric line (2 The circuit breaker capable of interrupting the secondary load circuit 6b1) can be said to be the secondary load circuit breaker 7b1, which is a circuit breaker capable of interrupting the circuit between the secondary winding of the transformer 3 and the storage battery auxiliary device 4'. is the electricity storage auxiliary circuit breaker 7c'.

Among these circuit breakers, the system breaker 7a may be a vacuum circuit breaker (VCB), and the tertiary load circuit breaker 7b2, the power storage circuit breaker 7c, and the power generation circuit breaker 7d are earth leakage circuit breakers. (ELCB, Earth Leakage Circuit Breaker, in particular, bus plug-in breaker (BPM, Bus Plug in Mccb (Molded Case Circuit Break)), and also includes electric light load breakers 7b11 and power load breakers 7b12. The secondary load breaker 7b1 and the power storage auxiliary circuit breaker 7c' may be molded case circuit breakers (MCCBs, particularly busbar plug-in breakers).
The rated capacity of these circuit breakers is also not particularly limited, but may be, for example, 6 kW, 20 kW, 50 kW, 100 kW, 111 kW, 180 kW, 250 kW, 1 kW or more and 1000 kW or less, preferably 10 kW or more and 600 kW or less, and more preferably 40 kW or more. It may be 400kW or less.
To explain in detail, the tertiary load circuit breaker 7b2 may have the largest rated capacity (250kW, 180kW, etc.) compared to other circuit breakers, and the power generation circuit breaker 7d may have the next largest rated capacity (111kW, etc.). etc.), the storage circuit breaker 7c may have the next highest rated capacity (such as 100kW), and the secondary load circuit breaker 7b1 and the power load circuit breaker 7b12 may have approximately the same rated capacity (such as 50kW). In this case, the power load circuit breaker 7b12 may have an even smaller rated capacity (such as 20 kW), and the power storage auxiliary circuit breaker 7c' may have the smallest rated capacity (such as 6 kW).
A plurality of loads 2, a plurality of power storage devices 4, a plurality of power generation devices 5, etc. may be connected to the tertiary load-side electrical circuit 6b2 and the secondary load-side electrical circuit 6b1 via one circuit breaker, Furthermore, even if one load 2, one power storage device 4, one power generation device 5, etc. are connected to the tertiary load side electric circuit 6b2 or the secondary load side electric circuit 6b1 via one circuit breaker, I do not care.

<Panel housing 8>
As shown in FIGS. 1 to 8, the panel casing 8 is a casing that houses equipment of a power receiving and distribution board 10, which will be described later, and there may be only one in one power receiving and distributing system 1. , there may be more than one.
The specific configuration of the panel casing 8 is not particularly limited, but may include, for example, a high voltage panel casing 8A described later and a low voltage panel casing 8B described below.
The panel casing 8 may include a panel casing other than the high voltage panel casing 8A and the low voltage panel casing 8B, such as a control box or cubicle containing a control device 20, a communication device, etc., which will be described later. It may also include equipment casings such as.
Further, the weight of the panel casing 8 (the sum of the weight of the high voltage panel casing 8A and the weight of the low voltage panel casing 8B) may be lighter than the weight of the transformer 3 described above, and the specific weight of the panel casing 8 Although the value is not particularly limited, it may be, for example, 100 kg or more and 500 kg or less, preferably 150 kg or more and 450 kg or less, and more preferably 200 kg or more and 400 kg or less (such as 300 kg).

<High voltage panel housing 8A, low voltage panel housing 8B>
As shown in FIGS. 1 to 8 and 10, the high voltage panel casing 8A is a panel casing that is included in the above-described panel casing 8 and in which the above-described system breaker 7a is provided inside.
Furthermore, the low-voltage panel casing 8B is a panel casing that is included in the above-mentioned panel casing 8 and has the above-described load breaker 7b provided therein.
Note that the weight of these panel casings 8A and 8B may be supported by the transformer 3 described above, and as such support, the high voltage panel casing 8A may be attached to the transformer 3 described above from above. , the low voltage panel casing 8B may be attached to the high voltage panel casing 8A from one side in plan view (for example, from the front), and the lower end of the low voltage panel casing 8B may extend to the lower part of the transformer 3.
Here, "the lower end of the low voltage panel housing 8B extends to the lower part of the transformer 3" means that the lower end of the low voltage panel housing 8B is located near the lower end of the transformer 3 (above the lower end of the transformer 3). and extends within the range of 1/4 (1/4) or more and 1/3 (1/3) or less from the bottom of the vertical length of the transformer 3, and Although this includes that the lower end of the casing 8B is at approximately the same height as the lower end of the transformer 3, it does not include that the lower end of the low voltage panel casing 8B extends below the lower end of the transformer 3. Furthermore, even though the lower end of the low voltage panel casing 8B is approximately at the same height as the lower end of the transformer 3, the low voltage panel casing 8B is not installed relative to the installation surface, and only the transformer 3 It may be installed with respect to the installation surface, and conversely, the low voltage panel housing 8B may also be installed with respect to the installation surface.

There is no particular limitation on the specific configuration of the high-voltage panel casing 8A and the low-voltage panel casing 8B; Also called a cubicle. Note that the upper surfaces (top plates) of the high-pressure panel housing 8A and the low-voltage panel housing 8B may be tilted backward.
Hereinafter, the high-voltage panel casing 8A and the low-voltage panel casing 8B will be described as each having a substantially rectangular parallelepiped shape.
The high voltage panel casing 8A and the low voltage panel casing 8B may each have one or more doors 8Aa and 8Ba that can be opened and closed (two double doors, one side door, etc.). In particular, the side where the door 8Ba is provided in the low voltage panel housing 8B may be the front side of the low voltage panel housing 8B (as well as the power distribution board 10), and the side where the door 8Aa is provided in the high voltage panel housing 8A may be the front side. The rear side of the high-voltage panel housing 8A (as well as the power receiving and distribution board 10) may be used as the rear side. Note that the doors 8Aa and 8Ba of the high-voltage panel housing 8A and the low-voltage panel housing 8B may each have a window shape.
In addition, the high-pressure panel housing 8A and the low-pressure panel housing 8B may be separated by a partition plate 8s (see FIGS. 3 and 10(a)). Furthermore, since the front-to-back length of the high-voltage panel casing 8A is longer than the front-to-back length of the transformer 3, the rear portion 8Ab of the high-voltage panel casing 8A may protrude rearward from the transformer 3 (see FIG. 3). ). Furthermore, an eaves portion 8Bb that projects forward may be provided at the upper end of the low-pressure panel housing 8B (see FIG. 3).

The size of each panel housing 8A, 8B is not particularly limited, but if it is the high voltage panel housing 8A, for example, the left and right length (width) is 990 mm, the front and rear length (depth) is 950 mm, and the front The vertical length (height) on the side is 1070 mm, the vertical length on the rear side is 1040 mm, and the horizontal length is 700 mm or more and 1600 mm or less, preferably 800 mm or more and 1400 mm or less, and more preferably 900 mm or more and 1200 mm or less. or the longitudinal length is 650 mm or more and 1550 mm or less, preferably 750 mm or more and 1350 mm or less, more preferably 850 mm or more and 1150 mm or less, and the vertical length on the front side or rear side is 800 mm or more and 1700 mm or less, preferably 900 mm or more and 1500 mm or less. , more preferably 1000 mm or more and 1300 mm or less.
Regarding the size of the low-voltage panel housing 8B, for example, the left-right length (width) is 990 mm, the front-to-back length (depth) excluding the eaves part 8Bb is 350 mm (480 mm if the eaves part 8Bb is included), and the front side is 990 mm. The vertical length (height) on the rear side is 1860 mm, and the vertical length on the rear side is 1850 mm, and the horizontal length is 700 mm or more and 1600 mm or less, preferably 800 mm or more and 1400 mm or less, and more preferably 900 mm or more and 1200 mm or less. , the front and back length excluding the eaves part 8Bb is 200 mm or more and 650 mm or less, preferably 250 mm or more and 550 mm or less, more preferably 300 mm or more and 450 mm or less (including the eave part 8Bb, 350 mm or more and 800 mm or less, preferably 400 mm or more and 700 mm or less, and The vertical length on the front side or rear side may be 1550 mm or more and 2450 mm or less, preferably 1650 mm or more and 2250 mm or less, and more preferably 1750 mm or more and 2050 mm or less.

The high-pressure panel casing 8A and the low-pressure panel casing 8B may have an intake port 8' for sucking air into the inside from the outside, and an exhaust port 8'' for discharging air from the inside to the outside.
The positions of the intake port 8' and the exhaust port 8'' are not particularly limited; The exhaust port 8'' may be provided on the rear surface (opening into the gap with the transformer 3), and the exhaust port 8'' may be provided on the lower surface of the eaves section 8Bb in the low voltage panel housing 8B. By providing an intake port 8' and an exhaust port 8'' at a location, it is less noticeable than when a louver is provided on the side of each panel housing 8A, 8B, and the appearance is improved.In addition, in general, The port 8' is provided at the bottom of the high-voltage panel housing 8A and the low-voltage panel housing 8B, and the exhaust port 8'' is provided at the high-voltage panel housing 8A and the low-voltage panel housing 8B (above the transformer 3). It's okay.
Here, the partition plate 8s between the high-pressure panel housing 8A and the low-voltage panel housing 8B may also be provided with an opening (so-called a vent) through which air passes; Since the air inside the casing 8A passes into the outside of the low-pressure panel casing 8B, it can be said that it is the exhaust port 8'' for the high-pressure panel casing 8A, and the intake port 8 for the low-pressure panel casing 8B. '.
In addition, in the low voltage panel housing 8B, there is a gap for inserting a secondary load breaker 7b1 and a tertiary load breaker 7b2, which are bus bar plug-in breakers, into the secondary load side electric circuit 6b1 and the tertiary load side electric circuit 6b2. In particular, the secondary load breaker 7b1 of the bus bar plug-in breaker inserted into the insertion portion 8Bc may be inserted into the insertion portion 8Bc (see FIGS. 3, 4, and 7), as shown in FIG. 10(b). Shown below. The secondary load breaker 7b1 and the tertiary load breaker 7b2 are not only inserted into this insertion part 8Bc, but also inside the high voltage panel casing 8A (from the low voltage panel casing 8B, so to speak, on the back side). ), and the secondary load breaker 7b1 and tertiary load breaker 7b2 provided on the back side do not have to be busbar plug-in breakers.
Further, an insertion hole for a high voltage cable, which is the grid side electric circuit 6a, may be provided on the lower surface of the rearwardly projecting rear part 8Ab of the high voltage panel housing 8A, so that the high voltage cable can be inserted into the high voltage panel housing 8A. It will hang downward from the lower surface of the rear part 8Ab, and even if the system side electrical circuit 6a (high voltage cable) is arranged, there will be no problem in the longitudinal length of the switchboard 10.
Furthermore, an insertion hole for a low voltage cable, which is the load side electric circuit 6b, may be provided on the lower surface of the low voltage panel housing 8B, so that the low voltage cable hangs downward from the lower surface of the low voltage panel housing 8B. Therefore, even if the load-side electric line 6b (low-voltage cable) is arranged, there is no problem with the front-to-back length of the power receiving and distribution board 10.

<Power receiving and distribution board 10>
As shown in FIGS. 1 to 8, a power receiving and distribution board 10 according to the present invention is a board that includes the above-described board casing 8 and the above-described transformer 3.
Therefore, the weight of the switchboard 10 is the sum of the weight of the transformer 3 described above and the weight of the panel casing 8 described above (the sum of the weight of the high voltage panel casing 8A and the weight of the low voltage panel casing 8B). The specific value thereof is not particularly limited, but may be, for example, 1100 kg or more and 2500 kg or less, preferably 1450 kg or more and 2250 kg or less, and more preferably 1600 kg or more and 2100 kg or less (such as 1850 kg).
Such a power distribution board 10 includes the above-mentioned grid-side electrical circuit 6a (a part of it) and the grid circuit breaker 7a, and the above-mentioned grid circuit breaker 7a, inside the board housing 8 (high-voltage board housing 8A and low-voltage board housing 8B). It has (a part of) a load-side electric circuit 6b and a load breaker 7b, and may also have a power storage breaker 7c, a power storage auxiliary circuit breaker 7c', and a power generation circuit breaker 7d.
Moreover, in one power reception and distribution system 1, only one power reception and distribution board 10 may exist, or a plurality of power reception and distribution boards 10 may exist.

The power distribution board 10 is equipped with a high voltage AC load switch (LBS, Load Break Switch) 10a with a current limiting fuse and a zero phase voltage detector (ZPD, Zero -Phase Potential Device) 10b, Power Fuse (PF) 10c, Voltage Transformer (VT) 10d, Circuit Protector (CP) 10e, Synchronous Verifier 10f, Current Transformer ( CT, Current Transformer) 10g, digital multimeter (with Reverse Power Relay (RPR) and Over Voltage Ground Relay (OVGR) functions) 10h, autotransformer 10j, An uninterruptible power supply (UPS) 10k may be provided.
In addition, the power receiving and distribution board 10 has an instrument current transformer 10n ( Some of the parts include a clamp type current transformer 10n'), a fuse (F, Fuse) 10p, a voltmeter 10q, a voltmeter change over switch (VS) 10r, an ammeter 10s, an ammeter change over switch ( AS, Ammeter change over Switch) 10t, wattmeter (for example, based on the output of the voltmeter 10q and the output of each instrument current transformer 10n, the power of the load 2 (charger 2B) and the power of the power storage device 4 ( A storage power T) and a power meter 10u for measuring the power (generated power H) of the power generating device 5 may be provided.
Further, the power receiving and distribution board 10 may be connected to class B grounding (EB) from the transformer 3 or to class D grounding (ED) via the disconnection terminal 10v and the resistor 10x.

<Control device 20>
As shown in FIG. 2, the control device 20 is connected to the digital multimeter 10h in the panel housing 8 of the above-mentioned power distribution board 10, and outputs the output (stop signal, etc.) from the digital multimeter 10h, (Each wattmeter) A device that performs control such as stopping the conversion of the solar power conversion unit 5Ab described above based on the output from the smart logger 20a, although it may be configured as one device. and a control section 20b such as a sequencer or computer that executes a predetermined program.
In one power receiving and distribution system 1, the number of control devices 20 may be one or more.
Although the control device 20 is provided inside the panel casing 8 described above, it may be provided outside the panel casing 8 (high-voltage panel casing 8A or low-voltage panel casing 8B).
The power of the control device 20 (smart logger 20a and control unit 20b) is connected to the above-mentioned uninterruptible power supply 10k, and is input from the uninterruptible power supply 10k (the smart logger 20a receives power from the uninterruptible power supply 10k). (The power may be input via the AC adapter 20c). Further, monitoring, setting changes, operations, etc. of the control device 20 may be performed by the user directly, but may also be performed remotely via a communication device such as the Internet or a telephone line. Note that power may be input to the smart logger 20a without going through the AC adapter 20c.
In addition, the control device 20 may also control the flow of current between the system K, the load 2, the power distribution board 10, the power storage device 4, and the power generation device 5.

<Equipment 30a to 30e between panel housing 8 and system K>
As shown in FIG. 2, the power receiving and distribution system 1 includes a voltage and current transformer (VCT) installed between the panel housing 8 and the grid K in the grid-side electrical circuit 6a outside the panel housing 8. 30a, a power meter for purchasing power 30b, and a power meter for selling power 30c, and when installed on utility poles, pole air switches (PAS) 30d, pole air switches, etc. A protective relay device (Storage Over Current Ground, SOG) 30e attached to the device 30d may be included.
In addition, in the transaction transformer 30a in FIG. 2, K indicates the system K side, and L indicates the load side.
In addition, each of the watt-hour meters 30b and 30c may be a class B electrical appliance, and the pole-mounted air switch 30d may be a voltage transformer (VT), a zero-phase voltage detector (ZPD), or a lightning arrester. (Lighting Arrester, LA) may be built-in.
These transaction transformer 30a, power purchasing power meter 30b, power selling power meter 30c, pole-mounted air switch 30d, and protective relay device 30e are part of a system on the grid K side (power company side), which will be described later. It may also be said that it has.

<Others>
The present invention is not limited to the embodiments described above. Each configuration or the overall structure, shape, dimensions, etc. of the power receiving and distributing system 1, the power receiving and distributing board 10, the transformer 3, etc. can be changed as appropriate in accordance with the spirit of the present invention.
The power reception and distribution system 1 does not need to have the power storage device 4 or the power generation device 5. In this case, the power reception and distribution system 1 is first installed without the power storage device 4 or the power generation device 5, and then is installed without the power storage device 4 or the power generation device 5. The device 5 may be added later.
In the power receiving and distribution system 1, at least the tertiary winding side to which the charger 2B is connected does not have to be used for a predetermined time exceeding its rated capacity, and the transformer 3 has a secondary winding side and a tertiary winding side connected to the There is no need for one of the next windings to be used for a predetermined period of time exceeding the rated capacity of that one.
In addition, in the power receiving and distribution system 1, when the tertiary winding side to which the charger 2B is connected at least is used for a predetermined time exceeding its rated capacity, the power receiving and distribution system 1 is configured such that the charger 2B is not connected at least The secondary winding side may be used for the predetermined period of time below its rated capacity, and the transformer 3 may be used with either the secondary winding side or the tertiary winding side exceeding the rated capacity of the one. When the secondary winding side and the tertiary winding side are used for a predetermined time, the other one of the secondary winding side and the tertiary winding side may be used for the predetermined time period with a capacity lower than the rated capacity of the other. Note that if the side to which at least the charger 2B is connected is the secondary winding side, the above-mentioned relationship will be reversed.
In order to support the weight of the high voltage panel casing 8A and the weight of the low voltage panel casing 8B by the transformer 3, the arrangement of the high voltage panel casing 8A and the low voltage panel casing 8B may be reversed to that described above.
The transformer 3 does not need to have the hanging tool 3a.

The sum of the rated capacity on the secondary winding side and the rated capacity on the tertiary winding side of the transformer 3 may be larger than the power consumption (capacity) of the entire load 2, or vice versa, or may be substantially the same. do not have.
The stored power T of the power storage device 4 may be smaller than the power consumption of the load 2.
The stored converted power T' of the power storage conversion unit 4a may be approximately the same as or larger than the stored power T of the power storage device 4, or may be approximately the same as or smaller than the power consumption of the load 2. I do not care.
The power generation H of the power generation device 5 may be smaller than the power consumption of the load 2.
The generated converted power H' of the solar power conversion unit 5Ab may be approximately the same as the solar power generation power HA of the solar power generation device 5A, or may be larger, and may also be approximately the same as the power consumption of the load 2. or smaller.
The power receiving and distribution system 1 and the power receiving and distribution board 10 convert AC current from the transformer 3 into direct current to the load side electrical line 6b, and convert DC current from the load side electrical line 6b between the transformer 3 and the load side electrical line 6b. Direct current may be conducted to the load-side electrical circuit 6b by connecting a converting unit that converts the current to alternating current to the transformer 3. In this case, a converting unit in the load 2 such as the charger 2B may be connected. Alternatively, the power storage conversion unit 4a in the power storage device 4, the solar power generation conversion unit 5Ab in the power generation device 5, etc. may not be provided.
Among the circuit breakers, the tertiary load circuit breaker 7b2, the storage circuit breaker 7c, and the power generation circuit breaker 7d may also be molded circuit breakers. Further, the secondary load breakers 7b1 including the other lighting load breakers 7b11 and the power load breakers 7b12, and the power storage auxiliary circuit breaker 7c' may be earth leakage breakers.
The power reception and distribution system 1 and the power reception and distribution board 10 do not need to have the power storage circuit breaker 7c, the power storage auxiliary circuit breaker 7c', and the power generation circuit breaker 7d.
The power receiving and distribution system 1 and the power receiving and distribution board 10 include a secondary load breaker 7b1 and a tertiary load breaker 7b2 including a lighting load breaker 7b11 and a power load breaker 7b12, a power storage circuit breaker 7c, and a power storage auxiliary circuit breaker 7c'. Although it has circuit breakers such as the generation circuit breaker 7d, some of them may not be used (so to speak, it may have a spare circuit breaker).
The power receiving and distribution system 1 and the power receiving and distribution board 10 include a control device 20, a transaction transformer 30a, a power purchasing power meter 30b, a power selling power meter 30c, a pole-mounted air switch 30d, and a protective relay device 30e. It is not necessary to have it.
In addition, in the power receiving and distribution system 1, in the system-side electrical circuit 6a outside the panel housing 8, between the panel housing 8 and the system K, a separate circuit breaker, disconnector, or meter is installed between the panel housing 8 and the system K instead of the above-mentioned devices 30a to 30e. Current transformers, power fuses, instrument transformers, circuit protectors, voltmeters, voltmeter switching switches, digital multimeters (Over Current Relay (OCR), Under Voltage Relay (UVR)) ) may be provided inside a separate panel from the power receiving and distribution board 10 (board housing 8), and this separate board may include an excitation inrush current suppression circuit and the like. , the above-mentioned photovoltaic power conversion unit 5Ab, a circuit breaker capable of interrupting the electrical path between the photovoltaic power conversion unit 5Ab and the solar cell 5Aa, etc. may also be provided. Further, the other circuit breaker etc. mentioned above does not necessarily have to be provided inside the another panel mentioned above, and the other circuit breaker etc. mentioned above may be provided inside the panel housing 8, or any There is no need for it to be provided inside the board. The above-mentioned excitation inrush current suppression circuit may be provided inside the panel casing 8. In this case, the excitation inrush current suppression circuit may be provided anywhere inside the panel casing 8. However, for example, it may be provided in place of the above-described high voltage AC load switch with current limiting fuse 10a.
The system K related to the power reception and distribution system 1, the power reception and distribution board 10, and the transformer 3 described above will be explained in detail below.

<Series K>
As shown in FIGS. 1 and 2, the grid K transmits (receives) power to the power receiving and distribution system 1, the power receiving and distribution board 10, and the transformer 3, and is used by electric power companies to supply electricity to consumers. This refers to the entire system for the purpose of the project, and can also be called the power system K. Specifically, system K includes equipment such as a substation, power transmission line, and distribution line, and may also include a power plant. Moreover, the system K may include the above-mentioned transaction transformer 30a, power purchasing watt-hour meter 30b, power selling watt-hour meter 30c, pole-mounted air switch 30d, and protective relay device 30e.
Although the power handled by such system K may be either alternating current or direct current, the following description will be made assuming that it is alternating current.
In System K, most of the power transmitted is AC, so the power is transmitted using a three-phase, three-wire (3φ3W) system, and in order to reduce power transmission losses during transmission, the main long-distance power transmission section is is transmitted at as high a voltage as possible (for example, 6600V or 22000V).
The power transmitted through grid K is transformed (stepped down) in several stages near the point of consumption, and after the pole transformer, power is distributed using single-phase, two-wire (1φ2W), etc. .
The system K may be a system of an electric power company (commercial power system), a system owned by an organization such as a company or a local government, or a system inside a plant (independent power system).

Power receiving and distribution systems, power receiving and distribution boards, and transformers can be used not only for chargers but also for any other load equipment, and can be used regardless of the power contract or connection type, and can be used outdoors.・Can be used regardless of indoors.

1 Power reception and distribution system 2 Load 2a Secondary load 2b Tertiary load 3 Transformer 3a Hanging tool 4 Power storage device 5 Power generation device 6a System side electrical line 6b Load side electrical line 7a System breaker 7b Load breaker 8 Panel housing 8A High voltage panel casing 8B Low voltage panel casing 10 Power distribution board K System

Claims (5)

A power reception and distribution system comprising a load (2) capable of consuming power received from a grid (K), and a transformer (3) connected between the load (2) and the grid (K),
The load (2) includes a secondary load (2a) and a tertiary load (2b),
The transformer (3) is a three-winding type transformer including a primary winding, a secondary winding, and a tertiary winding,
The primary winding is connected to a system (K), the secondary winding is connected to a secondary load (2a), and the tertiary winding is connected to a tertiary load (2b),
Each of the rated voltage on the secondary winding side and the rated voltage on the tertiary winding side is lower than the rated voltage on the primary winding side,
The sum of the rated capacity of the secondary winding side and the rated capacity of the tertiary winding side is larger than the rated capacity of the primary winding side,
At least a lighting load (2a1) and/or a power load (2a2) is connected to the secondary winding of the transformer (3) as the secondary load (2a),
At least a vehicle charger (2B) having a built-in storage battery is connected as the tertiary load (2b) to the tertiary winding of the transformer (3), and a power storage device (4) and/or Or the power generator (5) is also connected,
A system breaker (7a) capable of interrupting the system side electric line (6a) between the system (K) and the transformer (3), and a load side electric line (6b) between the transformer (3) and the load (2). ), and a power receiving and distribution board (10) equipped with a load breaker (7b) capable of interrupting the transformer (3); power distribution system. The receiver according to claim 1 , wherein the transformer (3) is used only for a predetermined time at a tertiary winding side to which at least the charger (2B) is connected, exceeding its rated capacity. power distribution system. A transformer (3) connected between a panel casing (8) and a load (2) that can consume power received from the grid (K) and the grid (K) outside the panel casing (8). A power receiving and distribution board comprising:
The transformer (3) is a three-winding type transformer including a primary winding, a secondary winding, and a tertiary winding,
The primary winding is connected to a system (K), the secondary winding is connected to a secondary load (2a), and the tertiary winding is connected to a tertiary load (2b),
Each of the rated voltage on the secondary winding side and the rated voltage on the tertiary winding side is lower than the rated voltage on the primary winding side,
The sum of the rated capacity of the secondary winding side and the rated capacity of the tertiary winding side is larger than the rated capacity of the primary winding side,
The panel casing (8) is a high voltage panel casing (8) in which a system breaker (7a) capable of interrupting the system side electric circuit (6a) between the system (K) and the transformer (3) is provided. 8A) and a low voltage panel housing (8B) in which a load breaker (7b) capable of interrupting the load-side electric circuit (6b) between the transformer (3) and the load (2) is provided,
A power distribution board characterized in that the transformer (3) supports the weight of the high-voltage panel casing (8A) and the weight of the low-voltage panel casing (8B). As support for the weight of the high voltage panel casing (8A) and the weight of the low voltage panel casing (8B) by the transformer (3),
The high voltage panel housing (8A) is attached to the transformer (3) from above,
The low-voltage panel housing (8B) is attached to the high-voltage panel housing (8A) from one side in plan view,
The power distribution board according to claim 3 , wherein a lower end of the low-voltage board housing (8B) extends to a lower part of the transformer (3). The power distribution board according to claim 4 , characterized in that a hanging tool (3a) is provided at a position eccentric to one side of the transformer (3) in a plan view.