JP2895212B2 - Permanent current switch - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a permanent current switch used in a superconducting power storage system or the like.

<Related Art> In a superconducting power storage system, a permanent current switch having a special coil structure is interposed between superconducting coils.

The basic configuration of this superconducting storage system is shown in FIG.
In the figure, a permanent current switch 13 is connected in parallel to a superconducting coil 12 to form a permanent current loop 14, whereby power is stored as magnetic field energy. The supply of energy to the superconducting power storage system and the extraction of energy from the system are performed with the permanent current switch 13 turned off.

In the superconducting power storage system as described above,
A switch using superconductivity is used as a permanent current switch.

The structure of the permanent current switch using this superconductivity is
This is illustrated in the figure. In FIG. 6, 15 is a coil bobbin, 16
Is a superconducting wire (coil) wound around a coil bobbin 15, 17
Is an insulation sheet that insulates between the laminated coils, 18 is an insulation sheet
A heater for switch on / off control provided on the coil via 17 is provided, and 19 is a mold (or a coil presser) for fixing the coil.

As shown in FIG. 7, the superconducting wire 16 wound around the coil bobbin 15 has a superconducting filament 1 inside a Cu--Ni alloy 16a.
6b is buried in this Cu-Ni alloy 16
The electric resistance of “a” is higher than that of Cu used for a normal superconducting wire, and the resistance as a wire in a state of normal conduction becomes high. Therefore, the permanent current switch is
By turning the superconducting wire 16 into a normal conducting state by heating of 18 to make the wire into a high resistance state, the switch is turned off, and
The switch 18 is turned off by releasing the heating of the heater 18 to bring the superconducting wire 16 into the superconducting state.

By the way, in the coil winding of the permanent current switch 13, the inductance is suppressed as a non-inductive winding in which the first layer and the second layer are reversed, the magnetic field and the generation of electromagnetic force are reduced, and the coil is wound so as not to store energy inside. I have.

<Problems to be Solved by the Invention> In the above-described permanent current switch 13, when the coil 16 is small with a capacity of about 1 KA, sufficient tension can be applied by a human force at the time of rewinding during double-layer winding. it can.

However, when the capacity becomes about 10 KA, the coil 16 becomes large and the coil bobbin 15 becomes large. For this reason, when performing coil winding, a coil bobbin is attached to a winding machine, and the coil 16 is wound while applying tension. Then, when the winding machine is reversed at the end of the coil bobbin 15, the tension of the coil 16 is reduced at this time, and there is a possibility that the coil winding may be loosened.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a permanent current switch in which a coil is not loosened during rewinding even if the coil and the coil bobbin are large in capacity.

<Means for Solving the Problems> According to a configuration of the present invention for achieving the above object, a permanent current switch in which a coil is unwound at an end portion and two layers of coils are wound around a coil bobbin in opposite directions. , A first winding frame in which the first wound coil is in close contact along the peripheral surface is projected from an end of the coil bobbin, and the coil in a portion in close contact with the peripheral surface of the first winding frame is provided. The tip of the coil is pressed against the first bobbin to be locked, and the coil at a portion not in close contact with the peripheral surface of the first bobbin is in intimate contact with the coil bobbin in the opposite direction along the peripheral surface. A second winding frame for guiding the coil bobbin in the opposite direction on the first coil is detachably attached to the end surface of the coil bobbin.

<Operation> When the coil reaches the end after finishing the first winding, the coil is closely attached along the peripheral surface of the first winding frame with the second winding frame removed, and the second winding is performed while maintaining the tension. Install the frame. By attaching the second winding frame, the tip of the coil in a portion closely contacting the periphery of the first winding frame is pressed against and locked by the first winding frame. In this state, the coil is closely guided in the reverse direction along the peripheral surface of the second winding frame to guide the coil, and the coil is wound in the reverse direction on the first coil of the coil bobbin.

<Embodiment> FIG. 1 shows a sectional side view of a permanent current switch according to an embodiment of the present invention, and FIG. 2 shows a front view thereof. 3 and 4 are perspective views showing end faces of the permanent current switch according to one embodiment of the present invention.

The permanent current switch 31 according to the present embodiment is configured such that a superconducting wire (coil) 33 is wound around a cylindrical coil bobbin 32 in two layers.

A large number of thin plate-shaped blinds 34 extending in the axial direction are attached to the cylindrical surface of the coil bobbin 32 at regular intervals in the circumferential direction (at intervals of 5 mm) to form an uneven coil winding surface. Coil bobbin 32
Is provided with a flange 35 at its base end, and a support 35a is provided at the flange 35. Further, on the surface of the flange 35 on the coil bobbin 32 side, there are provided coil support members 36 and 37 for holding the end of the coil 33. The coil 33 is wound on the coil winding surface of the coil bobbin 32 in two layers, and the base 33a at the start of winding and the end 33b at the end of winding of the coil 33
Fixed to 36,37.

A cylindrical holding cylinder 38 is fitted around the outer periphery of the coil 33,
33 is fixed and protected on the coil winding surface of the coil bobbin 33 by the holding cylinder 38.

On the other hand, a first end surface (end surface) 32a of the coil bobbin 32 guides the coil 33 in the first layer and the second layer in the opposite direction, and secures a tension of the coil 33 at the time of rewinding to the second layer. A winding frame 43 and a second winding frame 44 are provided. That is, the fixing plate 42 is fixed to the end surface 32a of the coil bobbin 32 by the bolt 41, and the first winding frame 43 is fixed to the fixing plate 42 across the end surface 32a. The first winding frame 43 protrudes from the end surface 32a, has a peripheral surface with a smaller diameter than the coil bobbin 32, and the coil 33, on which the first winding is finished, comes into close contact with the peripheral surface (second). Arrow I in the figure). A disk-shaped second winding frame 44 is detachably mounted on the fixing plate 42 with the end face 32a therebetween.
Attached by 44a, the second winding frame 44 presses and locks the tip of the coil 33 at a portion closely contacting the peripheral surface of the first winding frame 43 against the first winding frame 43, and The part of the coil 33 that is not in close contact with the peripheral surface of the coil bobbin 32 is in close contact in the opposite direction along the peripheral surface (arrow II in FIG. 2). Arrow III)
Is to be guided to.

The end face 32a of the coil bobbin 32 is inclined, and the coil 33
Even if is a rectangular cross section, movement to the rewinding portion can be naturally performed at the end face 32a. Further, when performing the function test of the persistent current switch 31, it is necessary to put it in a cryostat (insulated container) and cool it with helium. At this time, the permanent current switch 31 is hung on the top plate of the cryostat using the support bracket 35a. During cooling, liquid helium flows between the blinds 34 and the coil 33 can be cooled efficiently. Further, when the first coil 33 is wound, the end of the coil 33 does not always reach the end of the coil bobbin 32. In this case, the remaining width is measured at the time when the first layer becomes one turn, and the spacer is interposed.

A holding plate 45 is provided on the end surface 32 a of the coil bobbin 32, and the holding plate 45 is fixed to the fixed plate 42 by bolts 45.
Further, a holding lid 46 that covers the end surface 32a of the coil bobbin 32 is attached to the fixing plate 42. A heater 47 that generates heat by energizing the coil bobbin 32 to increase the temperature of the coil 33
Is provided, and the heater 33 makes the coil 33 normally conductive or superconductive (switch ON-OFF). Further, the flange 35 is provided with a wire 48 for preventing the coil 33 wound in two layers from moving by electromagnetic force. The coil 33 is fixed by tightening the holding cylinder 38 with the wire 48.

The operation of winding the coil 33 around the coil bobbin 32 of the permanent current switch 31 having the above configuration will be described with reference to FIGS.

Attach the coil bobbin 32 to a winding machine (not shown)
The base 33a of 33 is fixed to the coil support bracket 36, and the coil 33 is wound around the coil bobbin 32 while applying tension to the coil winding surface. At this time, the second winding frame 40 is removed. coil
When 33 reaches the end face 32a of the coil bobbin 32, as shown in FIG. 3, the winding machine is stopped while the coil 33 is in close contact with the peripheral surface of the first winding frame 43 and the tension is maintained. The second winding frame 44 is fixed, and the coil 33 that is in close contact with the peripheral surface of the first winding frame 43 is pressed against the first winding frame 43 and locked. In this state, the coil 33 remains under tension.

As shown in FIG. 4, the winding machine is turned over, and the coil of a portion which is not in close contact with the peripheral surface of the first winding frame 43 is
The coils 33 are brought into close contact with each other in the reverse direction along the peripheral surface of the second winding frame 44 to guide the coils on the first coil 33. In this state, while applying tension again, the coil 33 is wound in the opposite direction and rewound, wound around the flange 35, and then terminated.
33b is fixed to the coil support bracket 37. Finally, the presser cylinder 38 is fitted to the outer periphery of the coil 33 and fixed with the wire 48, and the winding of the coil 33 of the permanent current switch 31 is completed.

Therefore, according to the permanent current switch 31 having the above configuration, when the first winding of the coil 33 is completed and the winding machine is reversed, the coil 33 is locked to the first winding frame 43 by the second winding frame 44. The tension of the coil 33 does not decrease.

<Effect of the Invention> The permanent current switch according to the present invention has a first bobbin projecting from an end face of a coil bobbin, and a coil that is in close contact with the peripheral surface of the first bobbin is locked to the first bobbin while the coil is Since the second winding frame that guides closely in the opposite direction is provided detachably, after winding the first layer, the second winding frame is attached and the coil is locked to the first winding frame with the second winding frame, , Even if the coil and the coil bobbin have a large capacity and a large size, it is possible to prevent a decrease in coil tension at the time of coil rewinding at the end of the coil bobbin. As a result, even if the coil is thick, it is possible to prevent the coil from being loosened and to improve the reliability of the permanent current switch.

[Brief description of the drawings]

1 is a sectional side view of a permanent current switch according to one embodiment of the present invention, FIG. 2 is a front view thereof, FIGS. 3 and 4 are perspective views thereof, and FIG. 5 is a superconducting power storage system. FIG. 6 is a block diagram showing the basic configuration, FIG. 6 is a sectional view of the permanent current switch, and FIG. 7 is a sectional view of a superconducting wire used for the permanent current switch. In the drawing, 31 is a permanent current switch, 32 is a coil bobbin, 32a is an end face, 33 is a superconducting wire (coil), 43 is a first winding frame, and 44 is a second winding frame.

Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) H01L 39/02-39/04 H01L 39/14-39/16 H01L 39/20

Claims (1)

(57) [Claims] 1. A permanent current switch in which a coil is rewound at an end and two layers of coils are wound around a coil bobbin in opposite directions. A first bobbin to be protruded from an end of the coil bobbin, and a tip of the coil at a portion closely contacting the peripheral surface of the first bobbin is pressed against the first bobbin to be locked, and The second winding frame, which is a part of the coil that is not in close contact with the peripheral surface of the one winding frame, is in close contact in the reverse direction along the peripheral surface, and guides the coil in the reverse direction on the first coil of the coil bobbin. A permanent current switch, which is detachably attached to an end surface of a coil bobbin.