JPS583289Y2 - Tadanshiki Tatsupu Kirikaesouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a tap changer for a transformer.

Conventionally, a multi-stage tap switching device used in a transformer has a fixed contact 1 connected to the tap of each phase winding of the transformer on a circular fixed contact plate 2, as shown in FIG. The fixed contacts 1 of each stage are connected to the insulated operating shaft 3 passing through the center of the fixed contact plate 2, and the fixed contacts 1 are connected to the insulated operating shaft 3 passing through the center of the fixed contact plate 2. 1 and a movable contact 4 provided in correspondence with each other so that they can be switched and connected at the same time.

However, this type of tap switching device has a fixed contact 1 on a fixed contact plate 2 and a movable contact 4 on an insulated operating shaft 3.
are fixed to each other, if the dimension between the fixed contact plates 2 of each stage does not completely match the length of the hollow insulating spacer 5 inserted between the fixed contact plates 2, the fixed contact 1 and the movable contact 4 are misaligned from each other, making it difficult to assemble them so that they can be switched and connected.Usually, the length of the insulating spacer 5 and the height of the base 6 on which the fixed contact 1 is attached are adjusted. Assembling the movable contact 4 and fixed contact 1 was done in advance, so assembling a multi-stage tap changer was very time-consuming.
This method also had the disadvantage of increasing the number of man-hours.

In view of the above-mentioned points, the present invention has been developed by mounting a movable contact on an insulated operating shaft so that it can move up and down and also move together, so that the mounting positions of the fixed contact and the movable contact can be easily matched, and The purpose of the present invention is to provide a multi-stage tap changer that can smoothly perform the switching connection and assemble the tap changer quickly and easily. , 11 is a tap changer for the main business, which is vertically installed inside the transformer 12 via a support fitting 13;
15 is an annular fixed contact plate made of insulating material with a large opening in the center. A plurality of stages are attached to the stud ports 19 of the 19-10-1 with insulating spacers 20 interposed therebetween at vertically spaced intervals.

Fixed contacts 18 are connected to taps led out from each phase winding of the transformer, and are arranged on the fixed contact plate 15 at equal intervals along the circumferential direction. As shown in FIG. 3, a conductive contact plate 17 provided with an arc-shaped connecting part 16 is attached to the fixed contact plate 15 with the connecting parts 16 facing each other, and the connecting part 16 is inserted into the opening inside the fixed contact plate 15. It is protruded and fixed.

21 has an insertion hole for the stud port 19 on the outside, and a through hole in the center through which the insulated operating shaft 24 connected to the operating handle 23 with the connecting fitting 22 passes, and the insulated operating shaft 24 and the stand holder are connected to each other. As shown in FIG. 1, it is inserted into the stud port 19 via an insulating spacer 20 while keeping a distance from the fixed contact plate 15, and is screwed into the stud port 19. By tightening the tightening nuts, the bearing plates 21 of each stage are fixed to the fixed contact plate 15.
and the stud port 19 (2).

25 is an insulated operating shaft 24 corresponding to the fixed contact 18 of each stage.
This is a clamping type movable contact mounted on the holder, and its structure is explained in detail with reference to Figs. Operation axis 2
4 is bored through the shaft hole 27, and this shaft hole 27
A long hole 28 is bored horizontally along the length of the contact holding plate 29 so as to communicate with the contact holding plate 29. By fitting the insulated operating shaft 24 through the shaft hole 27 and engaging the elongated hole 28 of the contact holding plate 29 with the retaining pin 30 protrudingly provided at a position corresponding to the fixed contact 18 of each stage, The contact holding plate 29 is attached to the insulated operating shaft 24 so as to be vertically movable and co-moveable with the insulated operating shaft 24.

35 is a movable contact plate, and as shown in FIGS. 2 and 4, the tip thereof is formed into a fan shape to connect two adjacent fixed contacts (18 a t 18 b in FIG. 2). The contact portion 31 has a pin insertion hole 32 drilled at a position corresponding to the pin hole 26 of the contact holding plate 29, and the other end has a fitting hole 33 into which the insulated operating shaft 24 is loosely fitted. drilled,
Furthermore, a hemispherical locking portion 34 that engages with the end of the elongated hole 28 is protruded inward at the rear of this fitting hole 33, and this movable contact plate 35 is fitted onto the insulated operating shaft 24. The connection portion 16 of the fixed contact 18 is fitted loosely into the mating hole 33, and the pin insertion hole 32 and the pin hole 26 of the contact holding plate 29 are aligned, and the connecting portion 16 of the fixed contact 18 is placed on both the upper and lower surfaces of the contact r holding plate 29. It is placed in a soldered state.

36 is a stop pin inserted across the pin insertion hole 32 of the movable contact plate 35 and the pin hole 26 of the contact holding plate 29;
The movable contact plate 35 and the contact holding plate 29 are movably connected by the stop pin 36, and spring receivers 37 are provided at both ends of the stop pin 36 protruding from the movable contact plate 35. and the movable contact plate 35, a push spring 3 urges the six-way contact plate 35 toward the contact holding plate 29 side.
8 is inserted.

Then, due to the force of this pressing spring 38, the movable contact plate 3
5 engages the locking portion 34 with the end of the elongated hole 28, and is held under pressure by two adjacent fixed contacts 18 with the contact holding plate 29 sandwiched therebetween.

In this way, by engaging the long hole 2B of the contact holding plate 29 with the engaging pin 30 of the insulated operation shaft 24, the movable contact plate 35 can be moved up and down until it comes into contact with the engaging pin 30. , the movable contactor 25 is supported by the insulated operating shaft 24 by the movable contactor plate 35 without falling off, and the fixed contactor 18
It is mounted in a state where it is clamped and rotated together with the insulated operating shaft 24 by the retaining pin 30.

When assembling the tap changer 11, the bearing plate 21 and the fixed contact 18 are fitted into the upper part of the stud port 19 with the insulating spacer 20 interposed therebetween.

Next, the contact holding plate 29 is fitted onto the insulated operating shaft 24, and the retaining pin 30 protruding from the insulated operating shaft 24 is engaged in the elongated hole 28 of the contact holding plate 29. Holding plate 29
A movable contact plate 35 fitted to the insulated operating shaft 24 is disposed on both upper and lower surfaces of the movable contact plate 35 with two fixed contacts 18 sandwiched between them.
After that, a stop pin 36 is inserted across the pin insertion hole 32 of the movable contact plate 35 and the pin hole 26 of the contact holding plate 29, and a push spring 38 is attached to both ends of this stop pin 36. The movable contact plate 35 is always attached to the two adjacent fixed contacts 18 by the force of the push spring 38, and the contact holding plate 29 is
By holding the movable contact 25 in a pinched state, the fixed contact 18 and the movable contact 2 for one phase can be separated.
Finish the assembly of step 5.

Thereafter, the fixed contact 18 and the movable contact 25 are assembled in the same manner with a predetermined number of stages spaced apart.

At this time, errors may occur in the length of the insulating spacer 20 or the mounting position of the engagement pin 30, causing the fixed contact 18 and the movable contact 25 to
If the mounting position of the contactor holding plate 29 is shifted,
Simply move the movable contact 25 up and down along the insulated operating shaft 24 within the range of 8 to the position where it can be switched and connected to the fixed contact 18. 35 clamps the fixed contact 18 by the force of the push spring 38, the mounting position of the movable contact 25 does not move along the insulated operating shaft 24.

To explain the switching operation, when the insulated operating shaft 24 is rotated in the direction of the arrow in FIG. 29 rotates in the same direction together with the movable contact plate 35 connected via the stop pin 36 to rotate the movable contact 25 itself.

When the end of the movable contact plate 35 on the opposite side to the rotating direction moves away from the fixed contact 18a, the positive pin 36 reaches a position close to the fixed contact 18b.

Therefore, the movable contact plate 35 is separated from the fixed contact 18a.
The end of the movable contact plate 35 close to the fixed contact 18c is opened and expanded by the force of the pressing spring 38.

When the position of the stop pin 36 reaches the intermediate position between the fixed contacts 18b and 18c, the movable contact 25 moves from the fixed contacts 18a and 18b to 1ab and 18c in each stage, as shown by the two-dot chain line in FIG. The fixed contacts 18 b t l 13 c are reliably connected to each other to bridge the (supporting) constant contacts 18 b t l 13 c.

By sequentially switching the movable contactor 25 and the fixed contactor 18 as described above, the tap windings of each phase are switched and connected to a predetermined tap voltage.

As mentioned above, the present invention has multiple stages of fixed contact plates in which fixed contacts connected to the tap windings of each phase are arranged at equal intervals in the circumferential direction, and the center of each stage of fixed contact plates is A movable contact is attached to the insulated operating shaft that passes through the insulated operating shaft so that it can move up and down in correspondence with the fixed contact and can move together with the insulated operating shaft, and this movable contact switches the fixed contacts of each stage at the same time. If the mounting position of the fixed contact and movable contact is shifted as in the conventional method, the length of the insulating spacer inserted between each stage and the height of the base can be adjusted appropriately each time. This is completely different from the previous method, in which the contact holding plate is fitted onto the insulated operating shaft, and an engaging pin protruding from the insulated operating shaft is engaged in the elongated hole in correspondence with the fixed contact. match,
A movable contact plate is provided on the upper and lower surfaces of the contact holding plate, and a movable contact plate that always presses two adjacent fixed contacts by a pressure spring is loosely fitted onto an insulated operating shaft. The tap changer is movable up and down within the range of the contact holding plate, and is attached to the insulated operating shaft with the fixed contact clamped so as to move together with the insulated operating shaft by means of an engagement pin. When assembling the movable contact, even if the mounting position with the fixed contact is misaligned, the movable contact itself can be moved along the insulated operation axis within the depth of the elongated hole to connect the two corresponding fixed contacts. The movable contact can operate smoothly because it can be quickly and easily clamped onto the insulated operating shaft and securely mounted on the insulated operating shaft without falling off from the insulated operating shaft in a position where it can be switched and connected to the fixed contact. At the same time, the number of assembly steps can be significantly reduced, and assembly work can be performed quickly, easily, and reliably.

In addition, in the present movable contact, when the movable contact plate separates from one fixed contact during tap switching, the side end of the movable contact plate on the side away from the fixed contact comes into contact with the fixed contact. Since it is not pressed by the compression spring, the gap becomes narrower, and conversely, the side end on the side that is about to make contact with the next fixed contact opens out as if it has a large opening, and the fixed contact is clamped from above and below. Since it is switched and connected to the next fixed contact in such a way that the insulated operating shaft can be rotated smoothly with a small torque, it has practical effects.

[Brief explanation of the drawing]

Fig. 1 is a vertical side view of the tap changer according to the present invention, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, Fig. 3 is a side view showing the movable contact of the tap changer according to the present invention, and Fig. 4 The figure is a plan view, FIG. 5 is a perspective view showing the state in which the contact holding plate is attached, and FIG. 6 is a side view showing a conventional tap changer in longitudinal section. 18...Fixed contact, 24...Insulated operating shaft, 25...Movable contact, 29...
Contactor holding plate, 35... Movable contactor plate, 36.
...stop pin, 38...push spring.

Claims (1)

[Scope of utility model registration request] A plurality of stages of fixed contact plates 15 are provided in which fixed contacts 18 connected to taps of the winding are arranged at equal intervals in the circumferential direction, and an insulated operating shaft 24 passing through the center of each stage of fixed contact plates 15 is provided. In a tap changer in which movable contacts 25 are arranged in multiple stages in correspondence with fixed contacts 18 in each stage, the fixed contacts 18 in each stage are simultaneously switched and connected by the movable contacts 25, The insulated operating shaft 24 has retaining pins 30 protruding in correspondence with the fixed contacts 18 of each stage, and the insulated operating shaft 24 passes through the position where the engaging pin 30 of the insulated operating shaft 24 exists. A shaft hole 27 is provided protruding in the center, and a long hole 28 is bored horizontally perpendicularly to the shaft hole 27 to communicate with the shaft hole 27 and to be engaged with the engagement pin 30 in a vertically movable manner. A pin hole 26 provided at the tip of the contact holding plate 29
is fitted onto the insulated operating shaft 24 through the shaft hole 27 with the contactor holding plate 29 facing the fixed contact 18 side, and the contactor holding plate 29 is inserted into each stage with the engagement pin 30 engaged in the elongated hole 28. It is attached to the insulated operating shaft 24 in correspondence with the fixed contact 18 of the insulated operating shaft 24 so as to be movable up and down within the depth of the elongated hole 28 and to be able to move together with the insulated operating shaft 24 via the engagement pin 30. , the upper and lower surfaces of the contactor holding plate 29 have two adjacent (
2) A pin insertion hole 3 is provided in the contact portion 31 that connects to the constant contact 18 and in a position that matches the pin hole 2B of the contact holding plate 29.
2 on one side and a movable contact plate 35 protruding from the other side with a fitting hole 33 through which the insulated operating shaft 24 passes.
3, the movable contact plate 35 is loosely fitted onto the insulated operating shaft 24, and is inserted into the pin insertion hole 32 of the movable contact plate 35 arranged on both the upper and lower surfaces of the contact plate 29, and the pin hole 26 of the contact plate 29. A stop pin 36 is inserted across the movable contact plate 35 to connect the movable contact plate 35 and the contact holding plate 29 so that they can move together, and the stop pin 36 projects from the movable contact plate 35.
Pressing springs 38 for urging the movable contact plate 35 toward the contact holding plate 29 are attached to both ends of the movable contact plate 3.
5 is held under pressure between two adjacent fixed contacts 18 with a contact holding plate 29 in between.