JPS6216529B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tap winding of an autotransformer, which is arranged in the order of shunt winding, tap winding (shunt side and series side), and series winding from the iron core side. , High series capacitance of the windings is large and can suppress potential fluctuations of the tap winding itself, and also has a shielding effect on the shunt windings and can also suppress potential fluctuations of the shunt windings. This provides a capacitive tap winding.

FIG. 1 shows the winding arrangement of this type of autotransformer. In the figure, 1 is the iron core leg, 2 is the stable winding for reducing the zero-sequence impedance of the winding, 3 is the shunt winding, 4 is the tap winding, 5 is the tap winding on the shunt side, and 6 is the series side. A tap winding 7 is interposed between the shunt winding 3 and the shunt tap winding 5.
An electrostatic shield made of a cylindrical conductor insulated at one point on the circumference so as not to form a turn, 8 is a series winding U is a high voltage side input terminal, u is a low voltage side output terminal,
9 is a lead wire of the low voltage side output terminal.

The shunt winding 3, the tap winding 5 on the shunt side, the tap winding 6 on the series side, and the series winding 8 are connected in series as shown in FIG. The connection switching terminals (taps) A to M provided on the winding 6 and the shunt tap winding 5 are provided so as to be freely switchable.

3 and 4 show the configuration of a conventional tap winding. In the conventional tap winding 4, the shunt side tap winding 5 and the series side tap winding 6 are each constituted by parallel cylindrical windings, and the conductors of the shunt side tap winding 5 and the series side tap winding 6 are connected to each other. They were configured by connecting them in series. The figure shows a case in which six conductors a to f and g to l are wound in parallel for three turns. Note that the conductors a to f of the series side tap winding 6 and the shunt side taps g to l are wound in the same direction. As shown in FIG. 4, the winding start end and winding end of the conductors a to f and g to l are drawn out to the upper and lower end surfaces of the winding along the axial direction of the winding. Furthermore, conductors a to f and g to l
are connected in series by an upper and lower connecting wire 10 connecting the winding start end and winding end of the conductor. That is, in the series side tap winding 6,
Conductors a to f are the top conductor a, the sixth (bottom) conductor f, the second conductor b, the fifth conductor e, the third conductor c, and the fourth conductor d in the parallel arrangement. are connected in series in this order. Similarly, in the shunt side tap winding 5, the conductors g to l are arranged in parallel: the uppermost conductor g, the sixth conductor l, the second conductor h, the fifth conductor k, and the third conductor i. , and the fourth conductor j are connected in series in this order. The winding end of the conductor d of the series side tap winding 6 is connected to the winding start end of the conductor g of the shunt side tap winding 5, and the series side tap winding 6 and the shunt side tap winding 5 are connected in series. The winding start end of the conductor a of the series side tap winding 6 is connected to the series winding 8, and the winding end of the conductor j of the shunt side tap winding 5 is connected to the shunt winding 3. Therefore, the number of turns of each of the series side tap winding 6 and the shunt side tap winding 5 when viewed from the series winding 8 side is as shown in the figure. That is, in the series side tap winding 6, conductor a has windings 1, 2, and 3, conductor b has windings 7, 8, and 9, and conductor c has windings 13, 14, and 15.
, conductor d has turns 16, 17, 18, conductor e has turns 10, 11, 12, conductor f has turns 4, 5,
6, and in the tap winding 5 on the shunt side, conductor g has windings 19, 20, 21, conductor h has windings 25, 26, 27, and conductor i has windings 31, 3.
2, 33, conductor j has windings 34, 35, 36,
The conductor k constitutes windings 28, 29, and 30, and the conductor l constitutes windings 22, 23, and 24. Furthermore, conductor a
Lead wires 11 are pulled out from the winding start end of , the connection part of conductors a to l, and the winding end end of conductor l, and connection switching terminals are connected outside the series winding 8 in the winding order starting from the series winding 8. A to M are provided. Therefore, between each terminal A to M, conductors a,
f, b, e, c, d and g, l, h, k, i,
j are connected, and the number of turns between each terminal is 3 turns. Therefore, by switching the connection of the lead wire 9 of the low voltage side output terminal u to the terminals A to M, the voltage of the low voltage side output terminal u is adjusted. Incidentally, in the prior art, connections as shown in FIGS. 5 and 6 were also used using a series side tap winding 6 and a shunt side tap winding 5 having the same structure. In the connection shown in FIG. 6, the lead terminal N from the shunt connection 5 is
By selectively connecting terminals G' or M on both sides of the shunt side tap winding 4, the voltage adjustment range of the low voltage side output terminal u is widened.

In the conventional tap winding as described above, the difference in the number of turns is approximately equal to the number of conductors between each winding to create a high series capacitance winding, so the potential distribution of the tap winding itself is quite good. When the shunt winding is a cylindrical winding, the shielding effect of the tap winding against the shunt winding is poor. It is necessary to provide an electrostatic shield to the coil, and in order to form a tap winding, there are problems such as the need for as many upper and lower connecting wires as the number of conductors to connect the winding start and winding end of each conductor.

The purpose of the present invention is to solve such problems with conventional tap windings, and by further increasing the series capacitance of the tap windings, the potential distribution of the tap windings themselves is improved, and the shunt High series capacitance tap winding with a new configuration that enhances the shielding effect on the windings, eliminates the need for electrostatic shielding to suppress potential fluctuations in the shunt windings, and further reduces the number of upper and lower crossover wires. It provides:

In the tap winding of the present invention, both the tap winding on the shunt side and the tap winding on the series side are composed of cylindrical windings in which m conductors are wound in parallel with n turns, and the tap winding on the shunt side and the tap winding on the series side The conductors of the tap windings are connected in series alternately by connecting the start and end of the winding with an upper crossover wire and a lower crossover wire, and the conductors of the shunt side tap winding and the series side tap winding are Lead wires are drawn out from the winding from the start end and the winding end, and connection switching terminals are provided.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below with reference to the drawings, with reference to embodiments of tap windings.

7 and 8 show a first embodiment of the tap winding of the present invention. In this embodiment, both the series side tap winding 6 and the shunt side tap winding 5 are constituted by parallel cylindrical windings in which six conductors a to f and g to l are wound in parallel for three turns. The conductors a to f in the series tap winding 6 and the conductors g to l in the shunt tap winding 5 are wound in opposite directions. For example, when the shunt tap winding 5 is entered from above and wound to the right when viewed from the front, the series tap winding 6 is entered from above and wound to the left. In addition, conductors a to f of the tap winding 6 on the series side and conductors g to f of the tap winding 5 on the shunt side.
As shown in FIG. 8, the winding start end and winding end of the winding L are drawn out along the axial direction of the winding to the upper and lower end surfaces of the winding, respectively. The conductors a to f of the series side tap winding 6 and the conductors g to l of the shunt side tap winding 5 are connected by connecting the winding start end and winding end with the upper crossover wire 12 and the lower crossover wire 13. , the series-side tap winding 6 and the shunt-side tap winding 5 are alternately connected in series in such an order as to provide a potential difference of approximately 12 turns (number of turns: 3×4) between each winding. In other words, in the series side tap winding 6, the first conductor a (the uppermost side in the parallel arrangement), the sixth conductor f (the lowermost side in the parallel arrangement), and the conductor 2.
The conductor b, the fifth conductor e, the third conductor c, the fourth conductor d, and in the shunt tap winding 5, the sixth conductor l, the first conductor g, the fifth conductor. k, the second conductor h, the fourth conductor j, and the third conductor i are connected in series, starting from the conductor a of the series-side tap winding 6 and alternately interposing the conductor of the other winding. There is. Therefore, in the series side tap winding 6, conductor a has turns 1, 2, and 3, and conductor b has turns 13, 14, and 15.
, conductor c has turns 25, 26, 27, conductor d has turns 31, 32, 33, conductor e has turns 19, 2.
0 and 21, and the conductor f constitutes windings 7, 8, and 9. In addition, in the shunt side tap winding 5, the number of turns of each conductor increases from the winding end to the winding start end, and the conductor g has windings 12, 11, 10 as viewed from the winding start end. The conductor h has turns 24,2
3, 22, conductor i has turns 36, 35, 34,
The conductor j has turns 30, 29, and 28, the conductor k has turns 18, 17, and 16, and the conductor l has turns 6, 5, and 4. As a result, a potential difference corresponding to approximately 4 times the number of turns (3) of the parallel winding, that is, 12 turns is provided between each winding of the series side tap winding 6 and the shunt side tap winding 5. Further, the lead wire 14 passes through the upper side of the winding from the winding start end of the conductors a to l drawn out to the upper end surface of the winding, and the winding of conductors a to l drawn out to the lower end surface of the winding. Lead wires 15 are drawn out from the terminal ends to the outside of the series winding 8 through the lower side of the winding, and connection switching terminals A to M are provided outside the series winding 8. Therefore, between each of connection switching terminals A to M, conductors a,
l, f, g, b, k, e, h, c, j, d, and i are connected, and the number of turns between each terminal is 3 turns.
The tap winding 4 of this embodiment can be connected as shown in FIG. 2, or can be connected in accordance with the connections shown in FIGS. 5 and 6. In the tap winding of this embodiment, the windings are connected to give a maximum potential difference of 12 turns, so as shown in Fig. 3,
Compared to the conventional tap winding shown in FIG. 4, the series side capacity is increased four times, and there is no need for an upper and lower crossover wire.
Note that the conductor is usually a rectangular electric wire, which is wound edgewise.

11 and 12 show a second embodiment of the tap winding of the present invention. In the tap winding of this embodiment, both the shunt side tap winding and the series side tap winding are made by arranging 3 sets of 2 thin rectangular wires stacked in the radial direction and winding them in 3 turns. It consists of parallel cylindrical windings. In other words, the series side tap winding 6 is constructed by stacking conductors a and b, c and d, and e and f in the radial direction, arranging them in parallel, and winding them for three turns. , conductors g and h, i
, j, k, and l are stacked in the radial direction, arranged in parallel, and wound three turns. In the series side tap winding 6 and the shunt side tap winding 5,
The conductors are wound in opposite directions. For example, when the series side tap winding 6 is entered from above and wound to the left when viewed from the front, the shunt side tap winding 5 is wound to the right. As shown in FIG. 10, the winding start end and winding end of the conductors a to f and g to l are drawn out along the axial direction to the upper end surface and the lower end surface of the winding, respectively. The conductors a to f of the series side tap winding 6 and the conductors g to l of the shunt side tap winding 5 are alternately connected by connecting the winding start end and the winding end end with the upper crossover wire 12 and the lower crossover wire 13. connected in series. That is, in the series side tap winding 6, the first conductor a on the outside, the second conductor c, the third conductor e, and the first conductor on the inside.
th conductor b, 2nd conductor d, 3rd conductor f
In the shunt side tap winding 5, the outer first conductor g, the second conductor i, the third conductor k, the inner first conductor h, the second conductor j,
Conductors a to l are connected in series in the order of the third conductor l, starting from conductor a of the series side tap winding 6 and connecting the conductors of the series side tap winding 6 and the shunt side tap winding 5 alternately. There is. Therefore, in the series side tap winding 6, the conductor a has windings 1, 2, and 3.
Conductor b has turns 19, 20, 21; conductor c has turns 7, 8, 9; conductor d has turns 25, 26, 27.
The conductor e has windings 13, 14, and 15, and the conductor f has windings 31, 32, and 33. In addition, in the tap winding 5 on the shunt side, the number of turns of each conductor increases from the winding end to the winding start end, and the conductor g has turns 6, 5, and 4 when viewed from the winding start end.
, conductor h has turns 24, 23, 22, conductor i has turns 12, 11, 10, conductor j has turns 30, 2.
9, 28, conductor k has turns 18, 17, 16,
The conductor l constitutes windings 36, 35, 34.
As a result, each winding of the series side tap winding 6 and the shunt side tap winding 5 is given a potential difference of about 6 turns in the vertical direction and 18 turns in the radial direction. Further, the lead wire 14 passes through the upper side of the winding from the winding start end of the conductors a to l drawn out to the upper end face of the winding, and from the winding end end led out to the lower end face of the winding. Lead wires 15 pass under the windings and are drawn out to the outside of the series windings 8, respectively, and connection switching terminals A to M are provided. Therefore, between each of connection switching terminals A to M, conductors a, g,
c, i, e, k, b, h, d, j, f, l are connected, and the number of turns between each terminal is 3 turns. The tap winding of this embodiment can also be connected as shown in FIG. 2, or can be connected in accordance with the connections shown in FIGS. 5 and 6. In the tap winding of this embodiment, the windings are connected to give a potential difference of 18 turns and about 6 turns, so the series capacitance of the winding is different from that of the conventional one shown in Figs. 3 and 4. This is about 5 times larger than tap winding. Further, in the tap winding having the configuration of this embodiment, upper and lower connecting wires are not required.

In each of the above embodiments, the number of conductors is 6 and the number of turns is 3 for both the series side tap winding and the shunt side tap winding, but the number of conductors and the number of turns can be arbitrarily selected.

The effects of the tap winding of the present invention are as follows.

(1) The potential distribution within the winding when an impact voltage is applied becomes good and becomes close to an ideal straight line.

11a and b, the series winding 8, the tap winding 4, and the shunt winding 3 are connected in series, and the tap winding 4
The potential distribution in the winding is shown when the connecting part of the shunt winding 3 is grounded and an impulse voltage is applied to the high voltage side input terminal U of the series winding 8.

In the figure, straight line 16 is an equal distribution (ideal straight line)
In the case of conventional tap winding, the broken line 17 indicates
A solid line 18 shows the potential distribution for the tap winding according to the invention. In the case of the tap winding of the present invention, the distribution is close to the ideal linear distribution. 12a and b show that the series winding 8, the tap winding 4, and the shunt winding 3 are connected in series, and the high voltage side input terminal U of the series winding 8 and the line end v of the shunt winding 3 are connected in series. The potential distribution within the winding is shown when an impulse voltage is applied to the connection point between the tap winding 4 and the shunt winding 3 with the tap winding 4 grounded. When the tap winding of the present invention is used, Fig. 11a,
As in case b, the potential distribution is extremely good.

(2) Conventional tap winding requires as many upper and lower crossover wires as the number of conductors to connect the winding start end and winding end of the conductor, but the tap winding of the present invention requires a There is no need for long vertical crossover lines.

(3) Since the tap winding of the present invention has a shielding effect on the shunt winding, there is no need for an electrostatic shield to prevent potential oscillations in the shunt winding. Therefore, the radial dimension of the winding is reduced, and the transformer as a whole can be made smaller.

(4) Materials and man-hours can be reduced because there is no need for an electrostatic shield, and there is no need for vertical crossover wiring.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the winding arrangement of a conventional autotransformer, Figure 2 is an explanatory diagram of the winding connection (for one phase), and Figures 3 and 4 are of the conventional tap winding. FIGS. 5 and 6 are explanatory diagrams showing the configuration, and are explanatory diagrams of other connections (for one phase) of the windings. 7 and 8 are explanatory diagrams of the first embodiment of the tap winding of the present invention, FIGS. 9 and 10 are explanatory diagrams of the second embodiment of the tap winding of the present invention, and FIG. Figures a and b and Figures 12a and b are explanatory diagrams of the potential distribution within the winding when an impact voltage is applied to an autotransformer using the tap winding of the present invention. 1... Iron core leg, 3... Shunt winding, 4... Tap winding,
5...Shunt side tap winding, 6...Series side tap winding,
8...Series winding, 12...Upper crossover wire, 13...Lower crossover wire, 14, 15...Lead wire.

Claims (1)

[Claims] 1. Shunt winding, tap winding,
A tap winding of an autotransformer in which series windings are wound in order, and is composed of a shunt side tap winding and a series side tap winding, and a branch side tap winding and a series side tap winding. m each winding
It is composed of parallel cylindrical windings in which two conductors are lined up and each is wound in reverse for n turns, and m conductors are located at the start end of each winding of the series side tap winding and the branch side tap winding, and m conductors are located at the end of each winding of the series side tap winding and the branch side tap winding. The m conductors located at A high series capacitance tap winding in which a wire is pulled out and a connection switching terminal is provided on the lead wire. 2. The tap winding on the shunt side and the tap winding on the series side each consist of a cylindrical winding in which m sets of a plurality of rectangular conductors stacked in the radial direction are arranged in parallel and wound in n turns. High series capacitance tap winding described in item 1.