JP2010219338A - Stationary induction apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stationary induction apparatus that achieves size reduction, operation at higher voltages, and a lower price. <P>SOLUTION: Only the innermost coil conductor of the next coil section in a voltage application section of an HIS winding type stationary induction apparatus is removed, and then an electric field relaxer is wound by one turn in place of the removed one. The electric field relaxer is provided at a position axially corresponding to the innermost coil conductor in the voltage application coil section. This structure achieves size reduction, operation at higher voltages, and lower price, and reduces electromagnetic interference. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a static induction device, and more particularly, to a static induction device having a disk-shaped coil section electric field relaxation structure.

  When determining the winding structure of a static induction device, for example, a transformer, the first thing to consider is that the winding potential distribution is uniform over the entire length against the intrusion of lightning surge from the system, and the winding space factor ( The ratio of the conductor occupying the winding cross-section is high, and the winding structure has good workability. Conventionally, HIS windings (high series capacity windings) have been widely used as one of the winding structures satisfying such requirements. This winding has a structure in which coil conductors having electrical potentials are arranged between adjacent conductors, and many methods have been proposed so far to improve the potential distribution by devising the winding method. However, this HIS winding has a potential difference of about three times the number of turns per coil section between adjacent coil sections (disk coils) due to its structure, and the innermost coil of the coil section corresponding to this portion. Since the electric field concentrates on the conductor, it becomes the weakest point of insulation, limiting the voltage of the equipment.

  In order to solve the problem of electric field concentration in a static induction device having such a high series capacity winding, the same potential as that of the innermost coil conductor is provided on the radially inner side of the coil conductor of the disk-shaped coil section. A structure in which a coil section is formed by winding a shield conductor for one turn has been proposed. By constructing the coil section with such a shield conductor, the electric field is reduced, the insulation distance is reduced, the coil height can be reduced, and the coil is miniaturized, so that the insulation reliability is improved and the size is reduced. A winding of a static induction device can be obtained (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 11-31628

  However, in such a static induction device, the electric field relaxation device is inserted into the innermost coil conductor of the coil one turn at a time for every coil section. This reduces the space factor of the windings (the ratio of the conductor in the winding cross section) and restricts the high voltage of the equipment. Further, since the electric field relaxation devices are inserted into all the coil sections, the working time is increased, and the price of the equipment is increased due to the increased number of processes.

  Accordingly, an object of the present invention is to provide a static induction device that efficiently arranges an electric field relaxation device around the voltage application unit and relaxes the electric field to realize higher voltage, smaller size, and reduction of shielding material of the device. It is.

  A stationary induction device according to the present invention includes a plurality of disk-shaped coil sections that are configured by coil conductors and connected in series and are stacked in the axial direction, and a spacer device that forms a refrigerant flow path between the coil sections, In a static induction device that is disposed on the innermost side of the coil section and includes an electric field relaxation device having the same potential as the coil conductor of the coil section, the electric field relaxation device is connected to the voltage application coil section of the coil section. On the other hand, it is provided only for the axially adjacent coil sections.

  According to the static induction device of the present invention, it is possible to realize a higher voltage, a smaller size, and a reduced shielding material of the device.

It is the schematic which shows the structure of the electric field relaxation apparatus of the static induction apparatus of Embodiment 1 of this invention. FIG. 2 is an enlarged schematic diagram of the electric field relaxation device of FIG. 1. It is the schematic which shows the electric field in the inner-end part of the coil section in the static induction apparatus which is not equipped with the electric field relaxation apparatus of this invention. It is the schematic which shows the electric field in the inner-end part of the coil section in the static induction apparatus provided with the electric field relaxation apparatus of this invention. It is the schematic which shows the electric field relaxation apparatus which concerns on Embodiment 2 of this invention.

  Embodiments of the present invention will be described below.

Embodiment 1 FIG.
FIG. 1 shows a winding structure diagram of a HIS-winding stationary induction device according to Embodiment 1 of the present invention. A plurality of axial spacers 2 extending in the axial direction at intervals in the circumferential direction are attached to the insulating cylinder 1 extending in the direction of the axis CL of the winding device of the stationary induction device. The axial spacer 2 is attached with radial spacers 6 arranged radially and spaced radially in the axial direction and circumferential direction. Between the radial spacers 6 are provided disk-shaped coil sections S1 to S3,... Sn and S1 ′ to S3 ′,. .., S3,... Sn, S1 ′ to S3 ′,... Sn ′, a refrigerant flow path 8 is formed by a spacer device 9 including an axial spacer 2 and a radial spacer 6. Hereinafter, for simplicity, the description up to S3 is used.

  The plurality of disk-shaped coil sections S1 to S3 and S1 'to S3' are each composed of a coil conductor 5, and are overlapped in the axial direction and connected in series to constitute an HV winding. The position of the coil conductor 5 in the HV winding is shown in FIG. 1 with numbers 1 to 27 and 1 'to 27' in the cross section of the coil conductor 5. The coil section S1 is constituted by the coil conductors 5 of No. 1 to 4 and 8 to 11, the coil section S2 is constituted of the coil conductors 5 of Nos. 5 to 7 and 12 to 15, and the coil section S3 is constituted of 16 to 19 and 24 to The 27th coil conductor 5 is comprised. Similarly, the coil section S1 ′ is composed of coil conductors 5 of 1 ′ to 4 ′ and 8 ′ to 11 ′, and the coil section S2 ′ is composed of coil conductors 5 of 5 ′ to 7 ′ and 12 ′ to 15 ′. The coil section S3 ′ is composed of coil conductors 5 of Nos. 16 ′ to 19 ′ and 24 ′ to 27 ′. Although not shown, the coil sections Sn and Sn 'which are upper and lower ends are grounded. An LV winding is provided on the inner side of the insulating cylinder 1 by an insulation distance L, and constitutes a winding device together with the HV winding.

  When a lightning surge enters, the highest surge voltage is applied to the coil sections S1 and S1 ', which are surge voltage application units, and the shared voltage gradually decreases in the order of the coil sections S2, S3 and S2', S3 '. Therefore, the insulation distance L is determined so as not to break down due to the electric field generated in the innermost coil conductors of the coil sections S1 and S1 ', which affects the increase in voltage and size of the device. Further, the thicknesses t0, t1 to t3, and t1 ′ to t3 ′ of the spacer 6 are determined so as not to cause dielectric breakdown between the coil sections, and this spacer thickness is determined by the electric field at the minute gap portion at the end of the coil conductor. Yes.

  In order to relieve the electric field generated by such a surge voltage, only the coil sections S2 and S2 ′ above and below the voltage application section of the electric field relaxation device 10 constituted by the shield conductors 4 and 4 ′ and the dielectrics 3 and 3 ′ are used. The coil conductor at that position is removed and inserted into the innermost side. In other words, the electric field relaxation device 10 is configured so that only the coil sections S2 and S2 ′ axially adjacent to the voltage application coil sections S1 and S1 ′ of the coil sections S1 to S3 and S1 ′ to S3 ′ are in the coil section S2. , S2 ′ is arranged on the innermost side in the radial direction, and has the same potential as the twelfth coil conductor 5 on the innermost side in the radial direction of the coil sections S2, S2 ′. Thus, it can be said that the electric field relaxation device 10 is one in which the innermost coil conductor 5 that has been present if the electric field relaxation device 10 is not inserted is removed and inserted instead.

  The electric field relaxation device 10 includes a dielectric 3 extending substantially parallel to the 12th coil conductor 5 adjacent to the axial spacer 2, and the innermost 12th and 12'th of the dielectric 3 and the coil sections S2 and S2 '. The shield conductor 4 is provided adjacent to the coil conductor 5 of No. 12 and 12 'between the coil conductor 5. The material of the dielectric 3 and the shield conductor 4 may be a known material.

  In the illustrated example, as shown in FIG. 2, the radial dimension of the electric field relaxation device 10, that is, the thickness t10, is equal to the radial dimension tc of the coil conductor 5 (No. 12, 12 ′) of the coil sections S2 and S2 ′. Equally, the field relaxation devices 10, 10 ′ are therefore the same for the innermost coil conductors 5 (11, 27, 11′27 ′) of the axially adjacent coil sections S1, S3, S1 ′, S3 ′. Located in radial position and aligned in the axial direction. Further, the axial dimension, ie, the width w10 of the electric field relaxation device 10 is made equal to the axial dimension, ie, the width W, of the coil conductor 5 (Nos. 1-27, 1'-27 ').

  Even if the coil conductor is removed in this manner, the distance between the upper and lower innermost coil conductors can be increased and the minute gap electric field at the end of the coil conductor can be relaxed. By combining these, it is possible to further improve the electric field relaxation in the minute gap portion at the end portion of the coil conductor.

  As is apparent from the above description, the static induction device of the present invention is composed of a plurality of circles that are constituted by the coil conductors 5 (Nos. 1 to 27, 1 ′ to 27 ′) and connected in series, and are stacked in the axial direction. Plate-shaped coil sections S1 to S3, S1 ′ to S3 ′, a spacer device 9 for forming a refrigerant flow path between the coil sections S1 to S3 and S1 ′ to S3 ′, and coil sections S1 to S3 and S1 ′ to S3 And the electric field relaxation device 10 having the same potential as the 12th coil conductor 5 of the coil section. The electric field relaxation device 10 is provided only for the coil sections S2 and S2 'that are adjacent in the axial direction to the voltage application coil sections S1 and S1' among the coil sections S1 to S3 and S1 'to S3'.

  In the illustrated example, the electric field relaxation device 10 is in a position corresponding to the innermost coil conductor 5 (No. 11, 11 ′) of the voltage application coil sections S1, S1 ′ in the axial direction, otherwise the innermost coil conductor 5 (No. 11). The coil conductor 5 is provided at a position where it should be disposed. In other words, it can be said that the electric field relaxation device 10 is arranged to be wound by one turn at the position of the twelfth coil conductor 5 on the innermost side of the coil sections S2 and S2 '. Further, the electric field relaxation device 10 has a radial dimension, ie, a thickness t10 equal to a radial dimension, ie, a thickness tc, of the coil conductor 5 (Nos. 1-27, 1'-27 '), and an axial dimension, ie, a width w10. The conductor 5 (Nos. 1 to 27, 1 'to 27') is made equal to the axial dimension, that is, the width W.

  FIG. 3 shows an equipotential line diagram in a conventional winding structure, and FIG. 4 shows an equipotential line in the case where the innermost coil conductor is removed and the electric field relaxation device 10 is inserted instead of the coil section S2 according to the present invention. The figure is shown. From these figures, when the electric field relaxation device 10 is inserted into the coil section S2, the distance between the electric lines of force is larger than in the case of the normal winding structure, and as a result, the innermost coil conductor 5 The electric field value at the minute gap portion at the end of the strand decreases. Furthermore, it can be understood that the electric field of the minute gap at the end of the strand of the coil conductor 5 adjacent to the insertion section is greatly relaxed by the electric field relaxation device 10.

  With such a structure, it is possible to relieve the electric field at the ends of the strands of the upper and lower coil conductors 5 on the innermost side of the coil section S2 in which the electric field relaxation device 10 is inserted, and accordingly, the coil sections S1 to S3 and The electric field concentration of the coil conductor 5 inside the 11th, 12th, 27th and 11 ', 12', 27'th of S1'-S3 'can be relieved. By relaxing the electric field concentration in this way, the insulation distance L between the HV coil and the LV coil can be reduced as compared with the case where the electric field relaxation device 10 is not inserted. Further, the thicknesses t0, t1 to t3, and t1 'to t3' of the radial spacer 6 between the coil sections can be reduced. By increasing the breakdown voltage in this way, even if the voltage of the device is increased, the insulation distance can be reduced as compared with the conventional structure, so that the size can be reduced. Furthermore, since only two electric field relaxation devices 10 are inserted, the shielding material is reduced.

Embodiment 2. FIG.
FIG. 5 shows the structure of the electric field relaxation device 11 for a stationary induction device according to the second embodiment. In this electric field relaxation device 11, the shield is arranged in the same manner as in the first embodiment, but the innermost conductor of the shield insertion section, that is, the space between the 12th coil conductor 5 and the shield conductor 4 of the electric field relaxation device 11. Are filled with an electric field relaxation resin mold 7. In this way, the electric field relaxation device 11 is filled between the shield conductor 4 and the innermost twelfth coil conductor 5 of the coil section S2 in addition to the dielectric 3 and the shield conductor 4. An electric field relaxation resin mold 7 is provided. If the dielectric constant of the electric field relaxation resin is equivalent to that of the insulation coating of the coil conductor, the dielectric constant ratio is reduced from 3 to 3.6 when the ratio is not filled, and as a result, the electric field concentration at the end of the coil conductor is reduced. Is possible.

  As described above, only the innermost coil conductor 5 of the coil sections S2 and S2 ′ next to the voltage application unit of the HIS winding static induction device is removed, and the electric field relaxation devices 10 and 11 are inserted only at the positions. Thus, the electric field generated in the minute gap portion at the end of the coil conductor formed on the innermost side of the application section S1 and the next (upper and lower) S2 and the next (upper and lower) S3, which are most likely to cause dielectric breakdown, can be relaxed, The distance L between the HV winding and the LV winding determined by the electric field generated at the minute gap portion at the coil conductor end of the entire HV winding is reduced as compared with the case where the electric field relaxation devices 10 and 11 are not inserted. can do. Therefore, the device can be reduced in size. The electric field relaxation devices 10 and 11 are arranged such that the dielectric 3 is the innermost side. The equipotential lines are distorted by the dielectric 3, and the electric field at the innermost coil conductor end of the upper and lower coil sections can be relaxed. Further, the electric field relaxation devices 10 and 11 arranged on the inner side of the innermost side are kept at the same potential as that of the adjacent coil conductor 5 and can greatly relax the electric field at the end of the adjacent coil conductor. That is, the minute gap at the end of the coil conductor of the coil section where the dielectric breakdown is most likely to occur only by inserting the electric field relaxation devices 10 or 11 one by one in the coil sections S2 and S2 ′ next to the applied coil sections S1 and S1 ′. The electric field can be relaxed. By efficiently inserting the electrostatic shielding material and the dielectric in this way, the number of members can be reduced, so that the space factor increases. This also increases the voltage or size of the device, and the effect thereof. Can reduce the price.

  The static induction device illustrated and described above is merely an example, and various modifications can be made, and the features of each specific example can be used altogether or selectively combined.

  The present invention can be used for static induction equipment.

  DESCRIPTION OF SYMBOLS 1 Insulation cylinder, 2 Axial spacer, 3 Dielectric, 4 Shield conductor, 5 Coil conductor, 6 Radial direction spacer, 7 Electric field relaxation resin mold, 8 Refrigerant passage, 9 Spacer device 10, 11, 11 Electric field relaxation device, CL axis , L Insulation distance, S1 to S3, S1 ′ to S3 ′ coil sections (S1, S1 ′ voltage application coil sections, S2, S2 ′ adjacent coil sections), tc radial dimension, W width, w10 width.

Claims (7)

A plurality of disk-shaped coil sections composed of coil conductors, connected in series, and stacked in the axial direction;
A spacer device for forming a refrigerant flow path between the coil sections;
In the static induction device that is disposed on the innermost side of the coil section and includes an electric field relaxation device having the same potential as the coil conductor of the coil section,
The static induction device according to claim 1, wherein the electric field relaxation device is provided only in a coil section adjacent to the voltage applying coil section in the axial direction in the coil section.   The stationary induction device according to claim 1, wherein the electric field relaxation device is provided at a position corresponding to an axial direction of the innermost coil conductor of the voltage application coil section.   The static induction device according to claim 1 or 2, wherein the electric field relaxation device is disposed by being wound by one turn at the position of the innermost coil conductor of the adjacent coil section.   The static induction device according to any one of claims 1 to 3, wherein the electric field relaxation device includes a shield conductor and a dielectric.   The static electric field relaxation device according to any one of claims 1 to 4, wherein the electric field relaxation device includes an electric field relaxation resin mold that fills a space between the adjacent coil section and the innermost coil conductor. Induction equipment.   The stationary induction device according to any one of claims 1 to 5, wherein a radial dimension of the electric field relaxation device is equal to a radial dimension of the coil conductor.   The stationary induction device according to any one of claims 1 to 6, wherein an axial dimension of the electric field relaxation device is equal to an axial dimension of the coil conductor.

Images