JPS607456Y2 - induction wire winding - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an induction wire for a transformer, a reactor, etc., in which a plurality of unit coils are stacked in the axial direction to form a two-circuit parallel circuit.

In general, power transformers directly connected to power transmission and distribution lines are exposed to abnormal voltages caused by various causes, such as abnormal voltage ranges caused by lightning surges, arc ground faults, etc., and switching surges caused by switching on and closing lines.

The initial potential distribution within the winding at the time of impact voltage entry is determined by a coefficient α=self2 determined by the ground capacitance CP of the winding and the series capacitance Cs within the winding.

Therefore, it is necessary to reduce the coefficient α so as to bring the initial potential distribution within the winding closer to the direct one, thereby suppressing potential oscillations within the winding and obtaining good impact voltage characteristics.

Conventionally, as induction electric device windings having two parallel circuits, those shown in FIGS. 1 and 2 have been used.

That is, the one shown in FIG. 1 is composed of high series capacitance windings WI, and the high series capacitance windings WI have coil numbers 1 to 48.
Each high series capacitance winding section I consisting of four unit coils of the unit coils shown in is connected in series. Two coils are formed each with high series capacitance winding, and each coil is arranged alternately.

The conductor groups A1 to A288 and the conductor groups a to B288 are connected in parallel between the line side connection terminal a and the neutral point grounding terminal n, respectively, and are wound in two circuits in parallel.

This two-circuit parallel winding refers to winding conductors A and B side by side in the axial direction of the winding in the same figure.

In this winding configuration, the voltage difference between adjacent conductors is large, so the internal capacitance C5 in the winding becomes large, the coefficient α becomes small, and the impact voltage characteristics become good.

However, since each conductor is arranged at different winding positions at intervals of
3, etc., must be cut and reconnected, which requires a very large amount of man-hours, and the winding work time is shorter than when the winding is made of ordinary winding as shown in Figure 2. is about 1.8-2. It became Yui.

In addition, when there are many coils and the number of turns of one coil is small, there is a drawback that very good potential distribution characteristics cannot be obtained.

The one shown in Figure 2 is composed of a normal winding W■, which is formed by connecting each ordinary winding section ■ in series, and each ordinary winding section ■ is connected to each conductor group. A and B are arranged in the winding order to form two coils each, and each coil is arranged alternately to form a two-circuit parallel circuit.

However, when the windings are constructed of ordinary windings, the series capacitance within the windings is extremely small, so the coefficient α becomes large, and the initial potential gradient within the windings becomes large, causing potential oscillations. It cannot be suppressed.

For this reason, as shown in Fig. 3, about 20 to 30% of the total coil from the line side connection terminal a side is made into high series capacitance winding WI, and about 70 to 80% of the remaining part from the neutral point grounding terminal n side is normal. A partially high series capacitance winding with winding W■ was considered.

In this winding, the ratio of the number of coils is determined so that the initial potential gradients of both windings WI and W■ are equal, so that both of these initial potential gradients are smaller than the initial potential gradient of the full-height series capacitance winding. At the same time, the potential distribution is also made more uniform.

In Figure 3, 12 coils, which account for 25% of the total number of 48 coils, are actually high series capacity windings WI, in which the high series capacity winding section ■ is connected in series, and the remaining 36 coils, which account for 75%, are high series capacity windings WI. The ordinary winding section ■ is connected in series as the ordinary winding W■.

This winding has the effect of suppressing potential vibration as described above, and the winding operation time is reduced by 30 to 35% compared to the full-height series capacitive winding shown in FIG.

Also, in Figure 4, both ends of the winding are line side connection terminals a.

In this case, a high series capacitance winding WI is also arranged on the line side connection terminal a' side, and the initial potential gradients of both windings WI and WI[ are made equal, It has the same effect as the case of FIG.

However, in the windings shown in Figures 3 and 4, the number of coils is always a multiple of 4, so the disadvantage is that the optimum number of coils cannot be determined from the overall winding dimensions, conductor dimensions, cooling, insulation strength, short circuit strength, etc. There is.

Therefore, as shown in Fig. 5, a high series capacitance winding WI is provided on the line side connection terminal a side, and a normal winding W is provided on the neutral grounding terminal n side, or as shown in Fig. 6. As shown, there is a connection terminal on the line side, and a high series capacitance winding WI on the a/ side.
In a winding in which a normal winding W■ is provided at the center of the winding, the high series capacity winding WI connection force 2 coils of the normal winding W■ are connected to a single normal winding section ■. As a result, the number of coils is set to an even number that is not a multiple of four.

However, in this case, since the conductor passes from the outer circumference of the winding to the inner circumference of the winding between the coil No. 12 and the coil No. 13, it is necessary to provide a crossover wire. In addition, it is necessary to measure the dimensions of the duct between the coils in order to pass the crossover wire, which increases the height of the coil and complicates the winding work.

It is an object of the present invention to eliminate the above-mentioned conventional drawbacks and to provide an induction electric device winding that has a potential vibration suppressing effect, is easy to wind, and is small in size.

Embodiments of the present invention will be described below with reference to the drawings.

In this embodiment, as shown in FIG.
A high series capacitance winding section I is formed by four unit coils among the unit coils shown in 12.A high series capacitance winding of two circuits in parallel is formed by connecting these high series capacitance winding sections 1 in series. The wire WI is placed on the side of the line side connection terminal a, and four of each unit coil from coil number 15 to coil number 46 are formed into normal winding section ■, and each of these normal winding sections is A two-circuit, parallel-wound normal winding W■ consisting of two circuits connected in series is placed on the neutral point grounding terminal n side, and both windings WI and WII are arranged so that the initial potential gradients of both windings WI and WII are equal. 2 coils (N
o, 13 to 14) are treated as two-ply parallel normal windings and classified as two-ply parallel normal windings.

Here, double winding refers to winding conductors A and B in the radial direction of the winding in the same figure.

Further, FIG. 8 shows another embodiment, in which two parallel-wound high series capacitance windings WI are connected to line side connection terminals 1. a
Ordinary winding W with two circuits wound in parallel and placed on the ' side
is placed in the center of the winding, the ratio of the number of coils in both windings WI and Wn is set so that the initial potential gradients of both windings WI and Wn are equal, and the high series capacitance winding of normal winding W■ is set. WI connection force 2 coils (No. 13 to 14) are set as two-ply parallel normal winding and two-pair parallel normal winding classification (2).

As described above, in the present invention, the induction electric winding is composed of a two-circuit parallel winding high series capacitance winding and a two-circuit parallel winding ordinary winding, and the initial potential gradients of both windings are made equal. Since the ratio of the number of coils is set, the number of coils in the entire winding is not only a multiple of 4 but also an even number and has the effect of suppressing potential vibration. Since a part of the unit coil is double-layered and parallel-wound, there is no need for a conventional crossover wire from the outer circumference of the winding to the inner circumference of the winding, and the height of the winding can be reduced. Work man-hours can be further reduced.

[Brief explanation of the drawing]

1 to 6 are explanatory configuration diagrams of induction electric device windings in respective conventional examples, and FIGS. 7 to 8 are explanatory configuration diagrams of induction electric device windings in each embodiment of the present invention, respectively. WI・・・Two circuits parallel winding high series capacity winding, w■・
...Two-circuit parallel winding normal winding, ■...High series capacity winding classification, ■...Normal winding classification, ■...
...Two stacked parallel normal windings, , a/...
...Line side grounding terminal, n...Neutral point grounding terminal, A1-A288...-Continued A conductor group, "1
-B288...-Continued B conductor group.

Claims (1)

[Scope of utility model registration request] In an induction electric winding formed by stacking a plurality of unit coils in the axial direction to form a two-circuit parallel circuit, the induction electric winding is composed of a two-circuit parallel winding high series capacitance winding and a two circuit parallel winding normal winding. At the same time, the proportion of the number of coils is set so that the initial potentials of the two circuit parallel winding high direct capacity winding and the two circuit parallel winding normal winding are equal, and the two circuit parallel winding high series capacitance winding An induction electric appliance winding characterized in that a wire is arranged on the side of a connecting terminal on a line side, and a part of adjacent unit coils of the two-circuit parallel winding normal winding is overlapped with two to form a parallel normal winding.