JPS58147014A - Stationary induction electric apparatus - Google Patents

Abstract

PURPOSE:To obtain a compact light weight induction apparatus with high surge resistance by a method wherein a disc insulating barrier is supported by a spacer and arranged between interleave winding units and oil passages are provided on top and bottom thereof. CONSTITUTION:A disc coil with an insulting conductor wound in a plurality of turns is arranged in a plurality of layers separately in the direction of the winding axis and interleave windings h1, h2, h3 are prepared by connecting the insulating conductors in such a way that they are inserted in between the coils and then a disc insulating barrier (i) is arranged therebetween. On the upper and bottom surfaces of the barrier (i), insulating spacers (j) are attached separately so as to partially sandwich the barrier (i) to form oil passages (k) for cooling are formed between winding unit (h). Although insulation is highly requested between the winding units (h), inpulse penetrating break down strength in this portion is by far improved by the installation of the insulating barrier (i), so that the spacing between the units (h) can be narrowed. In addition, the insulating film on the conductor can be made thin and the winding area rate can be improved, thus apparatus can be minimized in size.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to stationary induction electric appliances such as transformers and reactors, particularly those equipped with interleaved windings.

In general, a core-type transformer is constructed by having at least a low-voltage winding and a high-voltage winding on the legs of the iron core.In particular, high-voltage windings are usually made entirely of strands of conductor with insulation coating. It is constructed by winding it in a spiral shape to form a disc-shaped coil, and then stacking a plurality of layers of these rigid disc-shaped coils in the direction of the winding axis and connecting them in series. This one winding a is called a disk winding, and is also used in reactors and the like.

By the way, the high-voltage winding of a transformer is required to withstand steep surge voltages such as impulse voltages that enter from line-side terminals. The voltage generated in the circle A winding when a surge voltage is applied is determined by the ground distribution and the series silence tolerance distributed in the winding. 19. It is well known that the line is almost linear. What is used for this purpose is an allocated shielding winding or an interleaved winding. As shown in Figure 1, each disk-shaped coil al e 82... The insulated conductor constituting the coil is wrapped around a shielded conductor CT.

Note that the numbers in the figure represent the number of turns of the temple line counted from the track side terminal d. In the f nine factors, e is the inner insulating cylinder and f is the outer insulating cylinder. However, in this distributed shielding winding, there is a shielding conductor C1l inside the disk-shaped coil J@1 m am... An increase in the diameter of the emakied wire is unavoidable.6
9. Especially when applied to high voltage transformers such as 800 to 1100 KV, the problem is that the size of the transformer increases regardless of the capacity.On the other hand, as shown in the interleaved winding H1182 diagram,
A plurality of (two in this example) insulated conductors b1゜b are wound in a Zen-shape to form a disk-shaped coil g1゜g,...
...It is composed of a tube and has a disc shape;
Interleaved winding units hl I h, . . . are formed by arranging two layers as one set at intervals in the winding axis direction and connecting insulated conductors bt * bs in a complicated manner within each set.
..., and this winding unit h1#h2''-0
#'i: Connected in series.

However, in this one type of interleaved winding, if the maximum voltage between the disc-shaped coil gt and gs of the winding unit, for example, leather *V', is 1v, then the insulated conductor bt in contact with II
- bs between v/2, winding enin) hji1! Therefore, in order to deal with this, the insulation coating thickness Tt of the insulated conductor b1 s bs
Thicken the winding unit h1-hl, h3-bs
As a result, in high-voltage transformers, etc., the winding space factor not only decreases and the body becomes larger, but also the series electrostatic charge between turns and between disc-shaped coils decreases. There is a drawback that the capacitance becomes small and sufficient surge characteristics cannot be obtained.This is also the case with Adle.The purpose of the present invention is to eliminate the above-mentioned disadvantages of the prior art tube, and to develop a system that has high reliability against surge voltage. To achieve this object, the present invention provides a stationary induction electric appliance having an interleaved winding, which is small in size. , it is assumed that the disk-shaped insulating barrier t1 is supported by spacers and arranged so that an oil passage is formed above and below it.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

3 to 5 show embodiments of the jll of the present invention.

In FIG. 3, the same or equivalent parts as in FIG. 2 are given the same reference numerals. This embodiment differs greatly from the conventional example in that i.
A disk-shaped insulation barrier Q device is installed between h, b2 and bl1, etc. 0 The insulation barrier i is made of an insulating material such as pressboard, and is shown in Figures 4 and @5. As shown in the figure, the insulation barrier i, which has inter-coil spacers j made of an insulating material affixed at intervals in the central direction, is attached to the winding unit hl in a state where it is partially held by the spacers j. -h, between h, -bs...
・Since the cooling oil passage k is installed above and below it, oil passages k for cooling are formed. A holding portion l of the vertical duct is formed inside the spacer j.

For example, if the maximum voltage tv between gl and gl is V/2 between the insulated conductors and -b1, and the maximum voltage 3 between the insulated conductors is V/2 between the insulated conductors -b1,
■/2 voltage is generated. Since the impulse penetration breakdown strength between the disc-shaped coils is at most 372 times that between turns, it is most severe between winding units, that is, between turns, between coils gs and gs, and between g4 and gs. In this embodiment, since the insulation wire (rear i) is placed in this part, the insulator penetration breakdown strength of this part can be greatly improved. In addition, since there is sufficient insulation between the terminals, the insulation coating of the insulated conductor can be made thinner. Therefore, as a whole, the winding space factor is improved, the container body can be made smaller, and the series capacitance of the winding is increased, which improves the surge characteristics.As a result, 800KV, Adopting a high voltage transformer*1 such as 100KV and 11 interleaved tubes with good surge characteristics, it has the advantage of being compact. In addition, interleaved windings can also be used in transformers with a small number of turns to improve their surge characteristics. FIG. 6 shows an embodiment of II2 of the present invention. @6rI! A
3, the same reference numerals are given to the same or similar parts as in FIG. ,
Between the turns where the maximum voltage difference occurs between each unit, i.e. 8 and 49 degrees, 36 and 71...
Disc-shaped coil g* # gl...
・An insulating material is provided on the circumferential side.

In this way, the turns with the largest voltage difference among the interleaved winding units are completely separated by the insulation barrier i and cornering n, which has the advantage of further improving insulation stiffness. Embodiment 1 of II 3 of the Invention In the 1117 factors shown in FIG. 3, parts that are the same or equivalent to those in FIG. shaped coil p1+pz...... is 3 insulated conductors bi a k'l *bit aligned and 4
It is composed of one circle. This disc-shaped coil p1m
p@・・・・・・t 4 layers are arranged as one set with an interval t in the winding axis direction, and a connecting conductor bs*bs++b is provided at each main gate.
st2 interleaved winding units q□, q, , connected intricately in parallel.

..., and this winding unit q1eqz...
... Two parallel interleaved windings are two parallel interleaved windings that are connected in series. Even in such a winding, there is a relationship between the interleaved winding units, that is, ql-q,
Since the maximum voltage difference between the coils occurs at ., an insulating barrier is placed at this location.

In the above embodiment, it was explained that an insulating barrier was placed between the interleaved windings 1153 and 53, but
Even if the insulation barrier is selectively placed between the single-leap winding units on the line hotter side, where the voltage difference between the disc-shaped coils is particularly large, the voltage difference between the disc-shaped coils is L%/%.

In addition, in the above embodiment, an insulating barrier with a width that covers the entire surface of the disc-shaped coil is used, but the insulation barrier is used in areas where the voltage difference is particularly large among the same disc-shaped coils, for example, the diameter of the disc-shaped coil. Furthermore, in the above embodiment, the insulating barrier was explained as a disc-shaped integral piece, but this insulating barrier is circular. It may be divided into circumferential sections at appropriate angles, that is, semicircular or sector-shaped segments may be combined to form a disc. In this case, in order to maintain insulation strength at the joints of each segment, it is desirable that the segments overlap each other. In order to make the thickness of the overlapping part the same as the thickness of the overlapping part, the ends of the segments should be stepped.The thin semicircular or sector-shaped segments are placed with their ends abutted against the insulating barrier. It is also possible to combine them in a circular shape and stack several layers of this single material to obtain a desired thickness. In this case, it is preferable to shift the abutting portions of the segments in the circumferential direction for each layer in order to maintain insulation strength. By combining this F with insulating barrier tube segments, the insulating barrier can be manufactured easily.

1. In the above embodiment, a transformer was explained, but the same applies to a reactor and the like.

According to the above explanation, since a disk-shaped insulation barrier is placed between the interleaved winding units, the impulse penetration breakdown strength between the interleaved winding units is greatly improved, and there is sufficient insulation. The insulation thickness between certain turns, that is, the insulation coating thickness of the insulated conductor, can be reduced to 0. Therefore, the winding space factor is improved, the device body can be made smaller, and the series capacitance of the winding can be reduced. It has the advantage of being larger, improving surge characteristics, and being able to construct a small, lightweight, and highly reliable stationary induction tube.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a main part of a transformer having a conventional vibration damping shield II wrapper, Fig. 2 is a cross-sectional view of a main part of a transformer having a conventional interleaved winding, and Fig. 3 (q) is an embodiment of the present invention. Figure 114 is a cross-sectional view of the main parts of the transformer, and Figure 114 is a plan view showing an example of an insulation barrier used in the transformer.
A-line cross section factor, #! 6 and 187 are sectional views of main parts of transformers according to other embodiments of the present invention, respectively. Simple, f~~ side insulating tube, gi*g
s......~disk-shaped coil, h1*J~interleaved ta unit, i~insulation barrier, j~spacer, k
~Oil passage, pm. p, ......~disk-shaped coil, q□eq2...
...~Interleaved winding unit. Figure 2 Foil Figure 3 Figure 4

Claims (1)

[Claims] 1. A plurality of insulated conductors t - Disc-shaped coils formed by aligning and winding in a spring shape 1-e Disc-shaped coils arranged in an even number of layers at intervals in the axial direction, and the insulated conductors intertwine between the disc-shaped coils 15KWk Subsequently, an interleaved winding unit is constructed, and this interleaved winding unit t'' is provided with interleaves**' provided in multiple stages in the direction of the winding axis, and between the phase tiles of the interleaved winding unit,
A disc-shaped imaging barrier T is supported by a spacer so that an oil passage is formed above and below it, and a conductive film for preventing mold is used.