JPS6241404B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to tap windings for static induction appliances such as high voltage, large capacity transformers.

Conventional tap windings of high-voltage, large-capacity transformers had tap lead wires drawn out from both the top and bottom ends of the tap windings, so the lead wires drawn out from the bottom were connected to the bottom of the transformer case or to the lower yoke clamping fittings, etc. Close proximity to grounded parts is unavoidable, so the insulation of the lead-out parts must be strengthened. Therefore, the insulation structure of the tap outlet becomes complicated, and as a result, the oil flow openings at the lower end of the tap winding as well as other windings are significantly reduced, making it difficult for oil to flow into the winding. The cooling efficiency of the line had to be reduced. For example, in an autotransformer used for ultra-high voltage power transmission, the first
As shown in the figure, a tertiary winding _W3 , a tap winding W't, a parallel winding Wp, and a series winding Ws are wound around the iron core Co, and these windings are connected as shown in Figure 2. A high voltage terminal _H1 , a low voltage terminal _X1 , and a common terminal _T0 are drawn out. Here, as is well known, the series winding Ws is a winding having a predetermined number of turns, with both ends connected by a connecting wire ls, and the high voltage terminal _H1 is drawn out from the middle position of the winding Ws. Also, conventional tap winding W′t
is formed by arranging a number of conductors in parallel equal to the number of steps required for voltage regulation, and winding these conductors together in the number of turns necessary to obtain the voltage between each tap. For example, if you draw out five taps from the tap winding W't as shown in the figure and adjust the voltage in four steps, so that the voltage between each tap is equal to the voltage for 10 turns, the four conductors are A unit winding of 10 turns each formed by four conductors w′t ₁ ~
From both ends of w′t ₄ , lead lines l′ ₁ to l ₄ ′ and L′ ₁ to
Pull out L′ ₄ . Then, by connecting the lead wires L′ ₁ to L′ ₃ to the lead wires l′ ₃ to _{l 1} ′, the four unit windings w′t ₁ to w′t ₄ are connected in series. Taps are drawn out from the connection points of the output lines L' ₄ and L' ₄ , L' ₁ to L' ₃ , and l' ₃ to l' ₁ , respectively. The tap winding W't configured in this manner is connected to the parallel winding Wp via the tap selector TC, and both ends thereof are connected to the series winding Ws via the switching switch SW.
The tertiary winding _W3 is triangularly connected with other two-phase transformers and is used for the purpose of removing harmonics.

As mentioned above, in conventional tap winding, lead wires were drawn out from both ends in the winding axial direction, so it took a lot of effort to insulate the lead parts, and especially in the lower lead part, the winding Because the distance between the end and the iron core was short, we had to take great care in insulating it. In addition, the insulator provided to strengthen the insulation of the lead wire lead-out portion at the lower end of the tap winding blocks the oil passage, reducing the cooling efficiency of the tap winding. Further, in the conventional tap winding, since the number of conductors equal to the number of steps is simultaneously wound by the number of turns corresponding to the voltage between the taps, the thickness dimension of the tap winding in the radial direction is reduced. Therefore, it became necessary to reduce the radial dimensions of the shield rings and insulating flange collars disposed at both the upper and lower ends of the tap winding, which caused problems such as making it difficult to manufacture and attach these members.

SUMMARY OF THE INVENTION An object of the present invention is to provide a tap winding for stationary induction appliances that solves the above problems.

In order to solve the above-mentioned problems, the present invention divides the winding portion from which the voltage between each tap is obtained into an even number of divided windings in the tap winding of a stationary induction electric appliance in which the tap is pulled out every predetermined number of turns. The even number of divided windings is divided into first and second layers, and the first and second layers are arranged substantially concentrically with a predetermined gap between them, and the voltage between each tap is A predetermined divided winding wound on the first layer and a predetermined divided winding wound on the second layer are connected in series by a connecting conductor at the lower side of the end in the axial direction of the winding so as to obtain A tap lead wire is drawn out from the upper side of the end in the winding direction of the predetermined divided winding wound on the first and second layers.

The tap winding of the present invention will be explained in detail below with reference to the illustrated embodiments.

FIGS. 3 and 4 show an embodiment of the present invention, taking as an example a case where a four-step adjustment voltage is obtained in the same way as the conventional tap winding shown in FIGS. 1 and 2. , parts that are equivalent to those in FIGS. 1 and 2 are designated by the same reference numerals. Also, Figures 3 and 4
In order to clarify the correspondence in the figures, the same numbers are given to parts with the same potential, such as the ends of each winding and corresponding parts of the taps.

Figures 3 and 4 show that the number of turns required to obtain the voltage between each tap is 2 in the first and second divided windings.
In the case of division, w ₁₁ to _{w 14} represent the first divided windings constituting half of the winding portion corresponding to the voltage between the taps of the first to fourth steps, respectively, and w ₂₁
~ _w24 indicates a second divided winding forming the other half of each winding portion of the first to fourth steps.
These split windings are made by paralleling a number of conductors equal to the number of steps, and winding them simultaneously by the number of turns required to obtain a predetermined voltage between taps divided by the number of turns to be split. is divided into first and second layers arranged with a predetermined gap and concentrically wound. For example, in this example, the number of turns corresponding to the voltage between each tap is 10.
In order to obtain a regulated voltage of 4 steps with 4 conductors, divide the windings w ₁₁ to w ₁₄ and w ₂₁ to _{w 24} are configured. In addition, in FIG. 3, in order to show the electrical configuration of the tap winding, the divided windings w ₁₁ to w ₁₄ and w ₂₁ to w ₂₄ are shown for convenience.
are shown separated as independent windings arranged concentrically, but in reality, a tap winding is formed by winding four conductors in parallel as described above. As shown in Figure 5, split winding
A winding including w ₁₁ to w ₁₄ and a winding including split windings w ₂₁ to w ₂₄ are concentrically wound with the windings on the inside. In order to obtain the voltage between each tap, divide the divided windings w ₁₁ and w ₂₁ , w ₁₂ and w ₂₂ , w ₁₃ and w ₂₃ and w ₁₄ .
Connect the conductors L ₁ to _{L 4} at the lower end of the winding with w ₂₄ respectively.
At the same time, the series circuit of these divided windings is successively connected in series on the upper end side of the winding to form the tap winding Wt, and the upper end of the divided winding _w11 ,
The connection point between w ₂₁ and w ₁₂ , the connection point between w ₂₂ and w ₁₃ , and the connection point between w ₂₃ and
Tap exit lines _l1 to _l5 are drawn out from the connection point with _w14 and the upper end of _w24 , respectively.

As shown in FIG. 5, shield rings Sh ₁ and Sh ₂ for electric field relaxation are arranged adjacent to the lower and upper ends of the tap winding Wt, respectively, and the tap lead wire l ₁
~l ₅ penetrates the shield ring Sh ₂ and is drawn out. Further, the lower end of the tap winding Wt is insulated by an insulating flange collar _F1 that covers the vicinity of the lower end of the winding together with a shield ring _Sh1 . The vicinity of the upper end of the tap winding Wt is insulated by an insulating flange collar _F2 that covers the upper end of the winding and the shield ring _Sh2 , and the lead wires _l1 to _l5 pass through this flange collar. A chimney part f is provided to make the chimney. Shield rings Sh ₃ to _{Sh 6} are also provided at the lower and upper ends of the parallel winding Wp and the series winding Ws. These shield rings are e.g.
It consists of a wooden ring whose diameter corresponds to the diameter of the winding wire, and whose outer surface is covered with metal foil.

As is clear from FIG. 5, when the tap winding is divided as in the present invention and the divided windings are divided and wound into first and second layers arranged with a predetermined gap, Since the thickness dimension of the tap winding in the radial direction becomes large, the radial dimension of the shield ring and flange collar can be increased, making it possible to easily manufacture and attach them. Further, since no lead wire is led out from the lower end of the tap winding, an oil path can be formed in the overlapping portion of the ends of the two flange collars _F1 . Furthermore, there is no need to arrange a flange collar with a chimney on the lower end side of the tap winding, and the insulation structure of this part can be simplified. Therefore, the oil passage on the lower end side of the tap winding is not blocked, and the oil passage d (see Fig. 5) in the axial direction can also be formed inside the tap winding. Cooling efficiency is improved.

In the above embodiment, the number of turns corresponding to each tap-to-tap voltage (voltage of one step) of the tap winding is divided into two, but it can also be divided into an even number of four or more. Figures 6 and 7 show the case where the number of turns corresponding to the voltage between each tap is divided into four, and each voltage between the taps is obtained by a series circuit of four divided windings. In Figure 7, parts with equal potential are labeled with the same numbers 0, 1, 2, ... and 1', 2',
... is attached. In this embodiment, the first to fourth
The winding portion corresponding to the voltage between the taps of the steps (tap 2 to 8 in Fig. 7) is the first divided winding.
It is divided into four divided windings w ₁₁ - w ₁₄ - w ₄₁ - w ₄₄ , w ₁₁ - w ₄₁ , w ₁₂ - w ₄₂ , w ₁₃ - _{w 43} and w ₁₄ -
w By the series circuit of each divided winding of ₄₄ ,
The fourth step voltage is obtained. Here, if the voltage between each tap corresponds to, for example, 10 turns, the number of turns should be reduced to, for example, 2.
Divide into 4 turns, 2 turns, 3 turns, and 3 turns. First, we put 8 conductors in parallel and 6 conductors at the same time.
By winding turns, divide the winding W ₂₁ ~ _{W 24}
and the winding section including w ₄₁ to w ₄₄ (see Figure 6)
wind it. Next, on the outer periphery of this winding part, 8
The winding portion including the divided windings w ₁₁ to w ₁₄ and w ₃₁ to w ₃₄ is wound by winding two conductors in parallel and simultaneously winding four turns. In this case, the number of turns of the first divided windings w ₁₁ to w ₁₄ and the third divided windings w ₃₁ to w ₃₄ is 2, and the number of turns of the second divided windings w ₂₁ to w ₂₄ and the fourth divided windings is 2. The number of turns from w ₄₁ to _{w 44} is 3.

In the above embodiment, the present invention is applied to an autotransformer, but it can also be applied to other stationary induction electric devices, such as a normal transformer in which the primary and secondary windings are independent, and a load tap-changing transformer (LRT). ) etc. can also be applied.

As described above, according to the present invention, the winding portion for obtaining the voltage between each tap is divided into a plurality of divided windings, and these divided windings are divided into two layers and wound to tap the tap lead wire. Since the wire is drawn out from the upper side of the axial end of the winding, there is no need to insulate the drawn-out portion of the tap lead wire on the lower side of the axial end of the winding. Therefore, the insulation structure on the lower side of the tap winding can be simplified, the oil passage can be prevented from being blocked by the insulating material, and the cooling efficiency of the tap winding can be improved. Furthermore, there is an advantage that the thickness dimension in the radial direction of the tap winding can be increased, making it possible to easily manufacture and attach insulating members etc. arranged at both ends of the tap winding in the axial direction. . Further, according to the present invention,
Since predetermined divided windings wound on the first and second layers are connected in series by a connecting conductor at the lower end of the winding axial direction, an oil path is formed between the first and second layers. It is possible to form a gap sufficient for the tap winding, and the cooling efficiency of the tap winding can be further improved.

[Brief explanation of the drawing]

Figure 1 is a half-part schematic sectional view showing a conventional autotransformer with tap windings, Figure 2 is a connection diagram showing the electrical configuration of the autotransformer in Figure 1, and Figure 3 is the main A schematic configuration diagram showing an embodiment in which the invention is applied to an autotransformer, FIG. 4 is a connection diagram showing the electrical configuration of the embodiment of FIG. 3, and FIG. 5 is a winding diagram of the embodiment of FIG. 3. A half-part schematic sectional view showing the structure, and FIGS. 6 and 7 are a schematic structure diagram and a connection diagram showing other embodiments of the present invention, respectively. Wt……Tap winding, w ₁₁ ~ w ₁₄ , w ₂₁ ~ w ₂₄ , w ₃₁
~ _w34 , _w41 ~ _w44 ...Divided winding, _l1 ~ _l5 ...Tap lead wire.

Claims (1)

[Claims] 1. In a tap winding of a stationary induction electric appliance in which a tap is pulled out every predetermined number of turns, the winding portion that obtains the voltage between each tap is divided into an even number of divided windings, and the even number of divided windings are divided into the first and second windings. The first and second layers are arranged approximately concentrically with a predetermined gap therebetween, and the first layer is wound around the first layer so as to obtain the voltage between the respective taps. The predetermined divided winding and the predetermined divided winding wound on the second layer are connected in series by a connecting conductor at the lower side of the end in the axial direction of the winding, and the predetermined divided winding is connected in series to the first and second layers. 1. A tap winding for a stationary induction electric appliance, characterized in that a tap lead wire is drawn out from the upper side of the end in the winding direction of a predetermined divided winding.