JP2012046014A - Feeder device and direct-current feeding system for railway - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a feeder device and a direct-current feeding system for railways, capable of reducing the number of substation of a direct-current feeding system for railways, and capable of quickly restricting or cutting the over-current when the over-current exceeding an allowable range flows in the direct-current feeding system for railways.SOLUTION: The feeder device includes: a superconducting cable 2 connected to a first substation 1B and a second substation 1A to feed the current, which is supplied from the first substation 1B, to the second substation 1A; a feeding branch line 31 divided from the superconducting cable 2; a superconductive bulk body detachably provided on the way of the feeding branch line 31; a feeder 5 connected to the feeding branch line 31 and connected to a trolley line 7 through a plurality of feeding branch lines 6; and a refrigerant for cooling at least one part of the superconducting cable 2 and the superconductive bulk body to a critical temperature or less. The current fed by the superconducting cable 2 is supplied to the trolley line 7 through the feeding branch line 31, the feeder 5 and each of the feeding branch lines 6.

Description

  The present invention relates to a feeder apparatus that is applied to a DC power feeding system for railways and supplies a current supplied from a substation to an overhead line, and a DC feeding system for railways using the same.

  FIG. 6 is a schematic diagram of a conventional railway DC feeder system. In FIG. 6, 101 is a DC substation (SS), 102 feeder, 103 is a trolley line (overhead wire), 104 is an air section, 105 is a return line, and 106 is an electric vehicle. Here, the conventional feeder 102 is made of an aluminum wire or a copper wire, is installed along the railway line from the DC substation 101, and is configured to be connected to a trolley wire 103 using a copper wire at predetermined intervals. ing. Here, since the feeder 102 and the trolley wire 103 using the conductive material have electrical resistance, the voltage decreases as the distance from the substation 101 increases. For this reason, the substation 101 is generally installed every few kilometers along the railway line, for example, every two to three kilometers.

By the way, although the examination about the power transmission using the superconducting wire has been performed actively, the application of the superconducting wire to the DC feeding system as described above is also being studied in the railway field (for example, (See Patent Document 1). In the DC feeding system, the energization current is DC and the voltage is relatively low, such as about 1500 V. Therefore, there is a high possibility that various problems caused by the DC feeding system can be solved when a superconducting wire is used.
Moreover, since the resistance of the feeder 102 is reduced by using the superconducting wire as the feeder 102, for example, the power loss and voltage drop in the feeder 102 are reduced, so that the installation interval of the substation 101 can be extended or consolidated. This is considered to lead to benefits such as energy saving, capital investment reduction and maintenance reduction by improving the possibility and regeneration rate.

Japanese Patent No. 4080073

  However, in a DC feeder system that uses superconducting wires, if an overcurrent exceeding the critical current flows in the superconducting wires due to lightning or a short circuit accident in the power system, the superconducting wires transition from the superconducting state to the normal conducting state and become resistant. And Joule heat is generated. If the overcurrent continues to flow, the superconducting wire may be burned by the generated Joule heat. In such a case, it is necessary to detect and repair the burned part of the superconducting wire, or if the burned part is large, the entire feeder must be replaced, which requires enormous cost and labor for repair. Since there seems to be a problem, a DC feeding system using a superconducting wire requires a safe system structure that can limit the current so that the superconducting wire does not burn out.

  The present invention has been made in view of such circumstances, and an object of the present invention is to reduce the number of substations installed in a DC power feeding system for railways, and to allow for a DC power feeding system for railways. An object of the present invention is to provide a feeder apparatus that can quickly suppress or interrupt an overcurrent when an overcurrent exceeding the range flows, and a railway DC feeder system using the feeder apparatus.

  The present invention has been made to solve the above problems, and the feeder apparatus of the present invention is connected to a first substation and a second substation installed along a railway line, and the first substation is connected to the first substation. A power supply superconducting wire that sends current supplied from the substation to the second substation side, and a power supply that branches from the power feeding superconducting wire and that supplies the current sent by the power feeding superconducting wire to the overhead wire side It has a branch line, a superconducting bulk body detachably provided in the middle of the feeding branch line, the feeding superconducting line, and a refrigerant that cools the superconducting bulk body to a critical temperature or lower. .

Further, the feeder apparatus of the present invention has a feeder and an overhead wire connected to a side opposite to the side connected to the feeding superconducting wire of the feeding branch line, and a current sent by the feeding superconducting wire Is supplied to the overhead line via the feeding branch line and the feeder.
In the feeder according to the present invention, the feeder may be a superconducting wire.

In addition, the feeder apparatus of the present invention is connected to a return line, and is provided detachably in the middle of the return branch line provided adjacent to the feeding branch line and the return branch line. The superconducting bulk body, the first substation and the second substation, and the return branch line connected to the return branch line and the return current sent via the return line and the return branch line are It has a superconducting wire for return to be returned to the substation.
The feeder apparatus of the present invention includes a linear core material, the superconducting wire for feeding and the return wire wound in a spiral shape around the core material so that the winding directions are opposite to each other. And a superconducting cable having an insulating layer that insulates each of the superconducting wires.

The feeder apparatus according to the present invention is characterized in that the branch line having the superconducting bulk body has a pair of clamps for detachably holding each end of the superconducting bulk body.
Moreover, the direct current feeding system for railroads of this invention is equipped with the feeder apparatus of the said this invention, It is characterized by the above-mentioned.

In the feeder apparatus according to the present invention, the first substation and the second substation are connected by the superconducting wire for power feeding, and the feeding branch line is branched from the middle of the superconducting wire for power feeding. Is supplied to the overhead line side via the feed branch line.
Since the electric resistance in the superconducting state is substantially zero in the superconducting wire for feeding, the potential of the connecting portion of the feeding superconducting wire with the feeding branch line is substantially the same as that of the first substation. Thereby, since this connection part functions similarly to a substation, it is possible to lengthen the installation space | interval of a substation correspondingly, and can reduce the number of installation of a substation.

Moreover, in the feeder apparatus according to the present invention, the superconducting bulk body is detachably provided in the middle of the feeding branch line.
As a result, when an overcurrent exceeding the critical current of the superconducting bulk body flows through the feed branch line, the superconducting bulk body transitions from the superconducting state to the normal conducting state, and generates electric resistance and Joule heat. Is limited. As a result, the overcurrent state in the system is suppressed. Furthermore, when the overcurrent state continues, the superconducting bulk body becomes even higher due to Joule heat, and in some cases blows out. This fusing cuts off the current in the system. For this reason, burning of the superconducting wire for power feeding due to overcurrent and damage to related equipment can be prevented.
In the feeder device of the present invention, the feeder wire is connected to the side of the feeder branch line opposite to the side connected to the feeder superconducting wire, and the current sent by the feeder superconducting wire is changed to the feeder branch wire, feeder. Supplied to the overhead line via the electric wire. Thereby, an electric current can be efficiently supplied to an electric vehicle.

In the feeder apparatus of the present invention, a superconducting wire can be used as the feeder.
As a result, the resistance of the feeder line is reduced, reducing power loss and voltage drop in the feeder line, extending and consolidating substation intervals, and effectively using regenerative power, thereby saving energy, reducing capital investment, and reducing maintenance. be able to.

  In the feeder apparatus according to the present invention, the first substation and the second substation are connected by a return superconducting wire separately from the feeding superconducting wire, and returned from the return line. A branch line is branched and a return branch line and a return superconducting line are connected. In this configuration, the return current from the electric vehicle is sent to the return superconducting line via the return line and the return branch line, and returns to the substation via the return superconducting line. The return superconducting wire has substantially zero electrical resistance in the superconducting state, and thus this configuration can reduce power loss and voltage drop in the return current path.

Further, in the feeder apparatus according to the present invention, a linear core member, the superconducting wire for power feeding wound around the core member in a spiral shape so that the winding directions are opposite to each other, and the return wire are provided. A superconducting cable having a superconducting wire for wires and an insulating layer that insulates each of the superconducting wires can be used.
In the superconducting cable of this structure, the winding direction is reversed between the feeding superconducting wire and the return superconducting wire, so that when a current flows through each superconducting wire, the magnetic field generated by each superconducting wire The directions are opposite to each other, and each magnetic field is canceled. Thereby, since an unnecessary magnetic field is not generated around the superconducting cable, it is possible to prevent the peripheral devices from being adversely affected by the unnecessary magnetic field.

Moreover, in the feeder apparatus of this invention, the branch line which has a superconducting bulk body has a pair of clamp which clamps each edge part of a superconducting bulk body so that attachment or detachment is possible.
Thereby, the superconducting bulk body can be easily detached from the branch line, and when the superconducting bulk body is melted by overcurrent, the superconducting bulk body can be easily replaced.
Furthermore, if a partition member is provided in the middle of the feeding branch line in which the superconducting bulk body is detachably provided, the feeding branch line and the superconducting bulk can be provided without affecting the refrigerant flow. There is an effect that the body can be exchanged.

It is a figure which shows an example of the DC feeding system for railways which applied the feeder apparatus which concerns on this invention. It is a schematic diagram of the DC feeding system for railways shown in FIG. It is a cross-sectional view of the superconducting cable with which the feeder apparatus shown in FIG. It is a perspective view which shows partially the branch part with which the feeder apparatus shown in FIG. 1 is provided. It is a perspective view which shows the whole branch part structure with which the feeder apparatus shown in FIG. It is a schematic diagram which shows one prior art example of the DC feeding system for railways.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a feeder device and a railway DC feeder system according to the present invention will be described below with reference to the drawings.
<First Embodiment>
First, a first embodiment of a railway DC feeder system to which a feeder apparatus of the present invention is applied will be described. FIG. 1 is a diagram showing a railway DC feeding system to which the feeder apparatus of the present invention is applied, FIG. 2 is a schematic diagram of the railway DC feeding system shown in FIG. 1, and FIG. 3 is a railway shown in FIG. FIG. 4 is a perspective view showing a part of a branch portion provided in the feeder apparatus of the railway DC feeder system shown in FIG. 1, and FIG. It is a schematic diagram of the branch part shown in FIG.

1 and 2, 1A is an A substation (second substation), 1B is a B substation (first substation), 2 is a superconducting cable, 3a to 3c are branch sections, and 4 is a refrigerant flow path. Pipe, 5 feeder, 6 feeder branch, 7 trolley (overhead), 8 section switch, 9 return line consisting of track, 10 electric car, 11 high-voltage distribution line, 12 An overhead wire, 13 is a hanger, and 14 is an iron pole for supporting each wire. Moreover, in FIG. 2, the arrow represents the direction of electric current.
The feeder device 15 of the present embodiment is composed of the superconducting cable 2, the branch portions 3 a to 3 c, and the refrigerant channel tube 4. Hereinafter, each part which comprises the feeder apparatus 15 is explained in full detail.

The superconducting cable 2 is provided along the line 9 between the A substation 1A and the B substation 1B.
As shown in FIG. 3, the superconducting cable 2 includes a linear former 21, an inner superconducting layer 22 provided on the outer periphery of the former 21, and an insulating layer 23 covering the outer periphery of the inner superconducting layer 22. And an outer superconducting layer 24 provided on the outer periphery of the insulating layer 23, and a protective layer 25 covering the outer periphery of the outer superconducting layer 24. The inner superconducting layer 22 and the outer superconducting layer 24 are insulated from each other. It is insulated via the layer 23.
Here, the outer diameter of each layer is 16 mm for the former 21, 17 mm for the inner superconducting layer 22, 17 mm for the insulating layer 23 (thickness: 2 mm), 23 mm for the outer superconducting layer 24, and 25 mm (thick) for the protective layer 25, respectively. However, these values are merely examples, and are not limited to these numerical values. In superconducting cable 2, a semiconductive layer or a laminated structure of an insulating layer and a semiconductive layer may be provided instead of insulating layer 23.

The inner superconducting layer 22 is formed, for example, by winding a superconducting tape (power feeding superconducting wire) around the former 21 in a spiral shape. The inner superconducting layer 22 is connected at its ends to the A substation 1A and the B substation 1B, and supplies the current output from the B substation 1B to a plurality of power supply branch lines 31 to be described later. Functions as an electric wire.
The outer superconducting layer 24 is formed by winding a superconducting tape (returning superconducting wire) spirally around the outer periphery of the insulating layer 23 in the direction opposite to the winding direction of the inner superconducting tape. The outer superconducting layer 24 is connected to the A substation 1A and the B substation 1B, and returns from the electric vehicle 10 via a return line (line) 9 and a plurality of return branch lines 32 described later. Functions as a second return line for returning to the B substation 1B.
The superconducting tapes used for each superconducting layer 22 and 24, for example, _{Bi2223 (Bi 2 Sr 2 Ca 2} Cu 3 O 10 + d) type silver sheath oxide superconducting tape is Iba _{R123 (RE 1 Ba 2 Cu 3} O 7- _X : RE represents a rare earth metal element such as Y or Dy) and a silver sheath oxide superconducting tape.

  Here, in the superconducting cable 2, the winding direction of the superconducting tape is reversed between the inner superconducting layer 22 and the outer superconducting layer 24. For this reason, when a current is passed through each superconducting tape (each superconducting layer 22, 24), the directions of the magnetic fields formed around each superconducting tape are opposite to each other and cancel each other. Thereby, the magnetic field which generate | occur | produces around each superconducting tape can be suppressed, and it can avoid having a bad influence on a peripheral device.

As shown in FIG. 5, the superconducting cable 2 of the present embodiment includes an insulating layer 23, an outer superconducting layer 24, and a protective layer 25 in a portion (feeding branch line connecting portion 26) connected to each feeding branch line 31 described later. Is removed and the inner superconducting layer 22 is exposed, and the protective layer 25 is removed and the outer superconducting layer 24 is exposed at a portion (returning branch line connecting portion 27) connected to each return branch line 32 described later. Has been. As a result, the inner superconducting layer 22 and the feed branch line 31 and the outer superconducting layer 24 and the return branch line 32 are in direct contact and are brought into conduction.
As for the connection between the inner superconducting layer 22 and the outer superconducting layer 24 of the superconducting cable 2, either one may be connected to the feeding branch line connecting portion 26 and the other connected to the return branch line connecting portion 27. Absent. In the above-described example, the example in which the outer superconducting layer 24 is connected to the feeding branch line connecting part 26 and the inner superconducting layer 22 is connected to the return branching line connecting part 27 has been described, but the reverse is also possible, depending on the section. The state of the connection does not matter, such as reversing the connection.

As shown in FIG. 2, the plurality of branch portions 3 a to 3 c are provided at predetermined intervals along the extending direction of the superconducting cable 2, and are respectively installed between the superconducting cable 2 and the feeder 5. And the return branch line 32 laid between the superconducting cable 2 and the return line 9.
As shown in FIG. 5, each feed branch line 31 and each return branch line 32 includes a superconducting cable connecting member 33, a first clamp 34 attached to the superconducting cable connecting member 33, a conducting wire 37, and It has the 2nd clamp 36 attached to the conducting wire 37, and the superconducting bulk body 35 hold | maintained at the 1st clamp 34 and the 2nd clamp 36, and is conducted as a whole.

Each superconducting cable connecting member 33 is constituted by a pair of conductive pieces.
Among these, the superconducting cable connection member 33 of each power supply branch line 31 has a pair of conductive pieces sandwiching the power supply branch line connection part 26 of the superconducting cable 2 (part where the inner superconducting layer 22 is exposed) and connected by a bonding material such as solder. By doing so, it is electrically connected to the inner superconducting layer 22.
Further, the superconducting cable connecting member 33 of the return branch line 32 has a pair of conductive pieces sandwiching the return branch line connecting part 27 (exposed portion of the outer superconducting layer 24) of the superconducting cable 2 with a bonding material such as solder. By being connected, the outer superconducting layer 24 is electrically connected.

Each superconducting bulk body 35 has a rod shape, and a lower end portion is detachably clamped by the first clamp 34 and an upper end portion is detachably clamped by the second clamp 36. That is, each superconducting bulk body 35 can be removed from between each clamp 34, 36 or attached between each clamp 34, 36 by opening and closing each clamp 34, 36.
Each conducting wire 37 is made of a conductive material such as copper. Among these, the conducting wire 37 of each feed branch line 31 is connected to the feeder 5, and the conducting wire 37 of each return branch line 32 is connected to the line (return line) 9.

The current output from the B substation 1 </ b> B to the superconducting cable 2 (inner superconducting layer 22) branches to each feeding branch line 31 at each feeding branch line connection portion 26 of the superconducting cable 2. The current branched to each power supply branch line 31 is supplied to the electric wire 5 via the superconducting cable connecting member 33, the first clamp 34, the superconducting bulk body 35, the second clamp 36, and the conducting wire 37.
On the other hand, the return current flowing through the return line 9 is commutated to the return branch line 32 at the connection with the return branch line 32. The current commutated to the return branch line 32 is transmitted to the superconducting cable 2 (outer superconducting layer 24) via the conducting wire 37, the second clamp 36, the superconducting bulk body 35, the first clamp 34, and the superconducting cable connecting member 33. Sent to.
Here, the superconducting bulk body 35 functions as a current limiter and further as a fuse when an overcurrent exceeding an allowable range flows through these branch lines, and functions to suppress and block the overcurrent. The function of the superconducting bulk body 35 will be described in detail later.

The refrigerant channel pipe 4 has a main pipe 41 through which the superconducting cable 2 is inserted and a plurality of branch pipes 42 that accommodate the respective branch portions, so that the main pipe 41 and each branch pipe 42 communicate with each internal space. It is connected to the.
The main pipe 41 has an inner diameter larger than the outer diameter of the superconducting cable 2, and there is a space in which the refrigerant 43 flows between the outer circumference of the superconducting cable 2 and the inner circumference of the main channel pipe (around the superconducting cable 2). It is configured to be defined. Further, the branch pipe 42 has an internal capacity sufficient to accommodate each branch part, and a space for accommodating the refrigerant 43 is defined between the branch part and the inner periphery of the branch pipe 42 (around the branch part). It is comprised so that it may be made. Moreover, it is preferable to provide one or two partition walls 38 for partitioning the branch pipe 42 into a plurality of parts so as to be positioned above and below the second clamp 36 inside the branch pipe 42. These partition walls 38 are advantageous when exchanging current limiter parts such as the conductive wire 37, the second clamp 36, and the superconducting bulk body 35 without obstructing the flow of the refrigerant 43 in the refrigerant flow path around the superconducting cable 2. It becomes.
A refrigerant 43 such as liquid nitrogen is supplied into the refrigerant channel pipe 4, and the pipes 41 and 42 are filled with the refrigerant 43. The cooling action of the refrigerant 43 cools the inner superconducting layer 22 and the outer superconducting layer 24 of the superconducting cable 2 and the superconducting bulk body 35 at the branching portion to a critical temperature or lower.

  In the railway DC power feeding system as described above, the current output from the B substation 1B to the superconducting cable 2 (outer superconducting layer 24) is fed to the feeding branch line 31 at each feeding branch line connecting portion 26 of the superconducting cable 2. It branches and is supplied to the feeder wire 5 through each feed branch line 31. The electric current supplied to the feeder 5 is supplied to the trolley wire 7 through each feeder branch line 6 and supplied to the electric vehicle 10 via the pantograph in contact with the trolley wire 7. The electric current supplied to the electric car 10 is used as power for the motor and the like, and then flows to the line 9 that is a return line. Then, the return current flowing in the line 9 is commutated to each return branch line 32 at the connection with the return branch line 32, and the superconducting cable 2 (outer superconducting layer 24) via each return branch line 32. And return to B substation 1B.

  In the superconducting cable 2 of the present embodiment, since the electric resistance in the superconducting state is substantially 0, the potential at each feeding branch line connection portion 26 of the superconducting cable 2 is substantially the same as that of the first substation 1B. . For this reason, each feeder branch line connection portion 26 functions in the same manner as a substation, and the same voltage condition as when a substation is provided for each closed circuit can be obtained. Therefore, if the place where the substation is to be provided is the feed branch line connecting portion 26, the substation at this place becomes unnecessary, and the number of substations is reduced accordingly. Reducing the number of substations will lead to reductions in substation sites, improved reliability by consolidating return facilities, and higher efficiency due to larger equipment. In particular, it is effective for effective use of land in the city center and effective use of facilities in rural areas.

Further, in the railway DC feeder system of the present embodiment, when an overcurrent exceeding an allowable range flows due to a lightning strike or a short circuit accident in the power system, it is provided in the middle of the feeding branch line 31 and the return branch line 32. The formed superconducting bulk body 35 functions as a current limiter or a fuse. Thereby, an overcurrent can be suppressed or interrupted.
Hereinafter, an overcurrent suppression / cutoff mechanism by the superconducting bulk body 35 will be described.
First, when an overcurrent exceeding the critical current of the superconducting bulk body 35 flows in the DC feeding system, the superconducting bulk body 35 transitions from the superconducting state to the normal conducting state, and generates resistance and Joule heat. When the resistance is generated in the superconducting bulk body 35, the current flowing through the feeding system is limited, and the overcurrent state is suppressed. That is, the superconducting bulk body 35 functions as a current limiter.

Here, when the cause of the overcurrent is immediately eliminated, the superconducting bulk body 35 does not melt even when the temperature exceeds the critical temperature, and is cooled by the cooling action of the refrigerant 43 to become the critical temperature or less. Return from the conducting state to the superconducting state. As a result, the DC feeding system also recovers to a normal energized state.
On the other hand, when the overcurrent state continues, the superconducting bulk body 35 becomes higher temperature due to Joule heat, and in some cases blows out. As a result, the current in the DC feeding system is interrupted. That is, the superconducting bulk body 35 functions as a fuse.
In this way, in this railway DC feeding system, when an overcurrent flows, the superconducting bulk body 35 functions as a current limiter or a fuse to suppress or block the overcurrent. For this reason, burning of the superconducting cable 2 due to overcurrent and damage to related equipment can be prevented, and the cost and labor required for repair and replacement of these can be reduced.

In addition, when the superconducting bulk body 35 is melted, it is necessary to replace it. However, the superconducting bulk body 35 can be easily attached and detached by opening and closing the first clamp 34 and the second clamp 36. In addition, it is possible to replace the superconducting cable 2 and related equipment at a lower cost.
The superconducting bulk body 35 can be easily attached and detached by opening and closing the first clamp 34 and the second clamp 36.
In addition, if one or a plurality of partition walls 38 are provided as described above with reference to FIG. 5 at the time of replacement, if the superconducting bulk body 35 is melted, it will be necessary to replace it. 38 does not hinder the flow of the refrigerant 43 in the refrigerant flow path around the superconducting cable 2, and when the current limiter parts such as the conducting wire 37, the second clamp 36, and the superconducting bulk body 35 are replaced, Since replacement is possible without obstructing the flow of the refrigerant, it has a structurally advantageous feature.

In such an overcurrent suppression / shut-off mechanism, the current value at which the operation of the mechanism starts (hereinafter referred to as “limit current value”) is determined by the critical current value of the superconducting bulk body 35.
Here, the superconducting bulk body 35 can control the critical current with relatively high accuracy by cutting the outer circumference of the bulk body and changing the diameter, and can easily adjust to the desired limit current value. .
In the present embodiment, one superconducting bulk body 35 is provided for each of the feeding branch line 31 and the return branch line 32, but a plurality of superconducting bulk bodies 35 may be provided. In this case, the plurality of superconducting bulk bodies 35 may be connected in series or in parallel. Thereby, by changing the number of superconducting bulk bodies 35 and the connection method, it becomes possible to control the operating current value and the operating mode of the overcurrent suppression / cutoff mechanism with higher accuracy, and the overcurrent suppression / cutoff mechanism can be controlled. It can be made more excellent in operability.

Second Embodiment
Next, a second embodiment of a railway DC feeder system to which the feeder device of the present invention is applied will be described.
Hereinafter, although the railway DC power feeding system according to the second embodiment will be described, the difference from the first embodiment will be mainly described, and the description of the same matters will be omitted.

The railway DC feeding system according to the present embodiment has the same configuration as the railway DC feeding system of the first embodiment except that a superconducting cable is used as the feeder 5 of the feeder apparatus 15.
As the superconducting cable to be the feeder 5, for example, a superconducting tape spirally wound around an outer periphery of a tubular former such as an aluminum corrugated pipe via an insulating tape can be used. In this superconducting tape, a refrigerant such as pressurized liquid nitrogen is introduced into the lumen of the tubular former, and the superconducting tape is cooled below the critical temperature by the cooling action of this refrigerant.

In the second embodiment, the same effect as in the first embodiment can be obtained.
Moreover, in the railway direct current feeding system of the second embodiment, the resistance of the feeder 5 is reduced particularly by using a superconducting cable as the feeder 5. For this reason, the power loss and voltage drop in the feeder 5 are reduced, the interval between substations can be extended and consolidated, and the regenerative power can be used effectively, and energy saving, equipment investment reduction, and maintenance reduction can be achieved.

As mentioned above, although the feeder apparatus of this invention and the DC power feeding system for railways using the same were demonstrated, each part which comprises a feeder apparatus and the DC feeding system for railways is an example in each embodiment. Any change can be made without departing from the scope of the present invention.
For example, in each embodiment, the feeder apparatus includes a feeder line, but the feeder line may be omitted and the inner superconducting layer 22 of the superconducting cable may be directly connected to the trolley wire 7.

  DESCRIPTION OF SYMBOLS 1A ... A substation (2nd substation), 1B ... B substation (1st substation), 2 ... Superconducting cable, 3a-3c ... Branching part, 4 ... Refrigerant flow pipe, 5 ... Feed wire, 6 ... feeder branch line, 7 ... trolley wire (overhead wire), 8 ... section switch, 9 ... track (return), 10 ... electric car, 11 ... high voltage distribution line, 12 ... butterfly wire, 13 ... hanger, 14 ... Iron pillars, 15 ... feeders, 21 ... formers, 22 ... inner superconducting layers (returning superconducting wires), 23 ... insulating layers, 24 ... outer superconducting layers (feeding superconducting wires), 25 ... protective layers, 26 ... Feed branch line connection part, 27 ... Return branch line connection part, 31 ... Feed branch line, 32 ... Return branch line, 33 ... Superconducting cable connection member, 34 ... First clamp, 35 ... Superconducting bulk body, 36 ... 2nd clamp, 37 ... Conductor, 41 ... Main pipe, 42 ... Branch pipe, 43 ... Refrigerant.

Claims (7)

A superconducting wire for feeding that is connected to a first substation and a second substation installed along a railway line and sends a current supplied from the first substation to the second substation side;
A feeder branch line that branches from the superconducting wire and supplies the current sent by the superconducting wire for feeding to the overhead wire side;
A superconducting bulk body detachably provided in the middle of the feeding branch line;
A feeder apparatus comprising the superconducting wire and a refrigerant that cools the superconducting bulk body to a critical temperature or lower.   The feeder branch line has a feeder wire and an overhead wire connected to the side opposite to the side connected to the feeder superconducting wire, and a current sent by the feeder superconducting wire is connected to the feeder branch wire and feeder wire. The feeder apparatus according to claim 1, wherein the feeder is supplied to the overhead wire.   The feeder according to claim 2, wherein the feeder is a superconducting wire. A return branch line connected to the line to be a return line and provided adjacent to the feeding branch line;
A superconducting bulk body detachably provided in the middle of the feeding branch line;
The first substation and the second substation are connected to the return branch line, and the return current sent via the return line and the return branch line is returned to the substation. The feeder apparatus according to any one of claims 1 to 3, further comprising a return superconducting wire.   A wire-shaped core member, the power feeding superconducting wire and the return wire superconducting wire wound in a spiral shape around the core member so that the winding directions are opposite to each other, and the respective superconducting wires. The feeder apparatus according to any one of claims 1 to 4, further comprising a superconducting cable having an insulating layer for insulation.   The feeder according to any one of claims 1 to 5, wherein the branch line having the superconducting bulk body has a pair of clamps that detachably hold each end of the superconducting bulk body. .   A railway DC feeding system comprising the feeder apparatus according to any one of claims 1 to 6.

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