JPS5837683B2 - Tap selector of tap switching device under load - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tap selector for an on-load tap-changing device used in an on-load tap-changing transformer, an on-load voltage regulator, or the like.

Conventionally, this type of tap selector has a fixed contact 11a, 1b connected to each tap of the tap winding, as shown in FIGS. The upper and lower parts are fixed separately and arranged in plural on the circumference, and a disc-shaped current collecting ring 4 is arranged in the insulating cylinder 3 at the center corresponding to the fixed contacts 1a, lb, and is used as a switching switch. The lead wire 5 to be connected is led out from inside the current collecting ring 4 through the insulating cylinder 3 using a copper pipe or a copper rod, and insulating between the current collecting ring 4 and the fixed contacts 1a, lb. Drive plate 6
The movable contact T, which is supported by and rotates in the circumferential direction, alternately bridges the fixed contacts 1a of the odd-numbered taps and the fixed contacts 1b of the even-numbered taps to select a tap. is.

Therefore, for three-phase applications, the current collecting ring 4 has six stages, and the insulating cylinder 3
As shown in FIG. 1, six lead wires 5 are passed through the insulating cylinder 3.

Moreover, the current collecting ring 4 is connected to the insulating tube 3 by a plurality of bolts 8.
In order to ensure an insulating distance between these lead wires 5 and between the lead wires 5 and the head of the bolt 80 that fixes the current collecting ring 4, the lead wires 5 are coated with an insulating coating. Of course, the diameter of the insulating cylinder 3 has to be increased, and the tap selector becomes large and expensive.

Furthermore, the terminal 9 of the lead wire 5 is connected to the current collecting ring 4 in the insulating tube 3.
In order to connect to the terminals, the holes 10 are opened at each stage by 60 degrees, and the terminals 9 are made to protrude outward from the holes 10 for connection. At the same time, in order to connect the lead wire 5 to the current collecting ring 4, the current collecting ring 4 is fixed to the outer periphery of the insulating cylinder 3 with bolts 8, and the lead wire 5 with the L-shaped terminal 9 is inserted into the insulating cylinder 3. The terminal 9 is passed through the hole 10 so as to protrude outward from the hole 10, and is bolted to the current collecting ring 4 for connection.

For this reason, a large number of lead wires 5 were inserted into the narrow insulating tube 3 with L-shaped terminals 9 attached, and the terminals 9 were placed in an unstable state by groping the long lead wires 5 and matching them with the holes 10. Since it has to be connected to the current collecting ring 4, it requires a lot of effort to assemble, which significantly increases the number of assembly steps, and has many drawbacks.

The present invention eliminates these drawbacks and enables the tap selector to be made compact, easy to assemble, and manufactured at low cost. Examples thereof will be explained below with reference to FIGS. 3 to 9. .

First, in FIGS. 3 and 4, 11 is an upper flange and a lower flange 1 (not shown) connected by a plurality of insulating struts 12, 12' arranged at approximately equal intervals on the outer periphery.
3 is an insulated drive shaft rotatably supported at the center of the shaft, and 14 is a movable contact mounted on the tip of a movable arm 15 with two contact pieces 16 facing each other and applying clamping pressure by a compression spring 17. The base of a movable arm 150 is integrally fitted and fixed to the insulated drive shaft 11, and together with the rotation of the insulated drive shaft 110, the movable arm 150 rotates around the insulated drive shaft 11 on its rotational circumference.

18 is an L-shaped connection terminal portion 19 on one flat surface of the disk shape.
integrally protruding from the insulated drive shaft 1 of the movable arm 15.
A current collector ring rotatably fitted into the circumferential groove 22 of a retaining ring 21 fixed by a bolt 20 to the upper surface of the base that is fitted with the insulated drive shaft 11, and installed concentrically with the insulated drive shaft 11. The contact piece 16 of the movable contact 14 is clamped to the outer peripheral edge of the movable contact 14 and is in slidable contact therewith.

In addition, a copper rod or a copper pipe is used in the connection terminal portion 19 protruding from one side, and a lead wire 23 led out to the outside of the tap selector and connected to a switching switch (not shown) is tightened with a bolt. 24 and lead out the lead wire 2.
3 is the above-mentioned insulating support column 1 2 .3 disposed on the outer periphery of the upper flange and lower flange 13 (not shown) at the L end thereof. 1. An insulating support rod 25 made of an insulating material such as hardwood, shown in FIG. 5, whose base is loosely fitted to 2'.
．． 25' are integrally tied together with an insulating thread or the like to prevent the lead wire 23 from moving or coming into contact with each other due to vibration or other causes, and to maintain a sufficient insulation distance.
3 is fixed, the current collecting ring 18 is prevented from cooperating with the movable contact 14 and is supported, and the contact piece 16 of the movable contact 14 is placed on the outer periphery of the current collecting ring 18 so as to press and slide into sliding contact. I'm looking forward to it.

On the other hand, 26 is a fixed contact attached to the insulating support 12 or 12', and a terminal 21 (not shown), which is derived from the tap winding and connects the tap conductor, protrudes outward and faces the current collecting ring 18. are mounted on the same plane, and are in contact with the outer end of the contact piece 16 of the movable contact 14, so that the contact piece 1
6, and is configured to bridge with the current collecting ring 18 via the current collecting ring 18.

These are arranged vertically for odd-numbered taps and for even-numbered taps to form one set.Furthermore, for example, in a three-phase case, three sets are arranged coaxially, and the lead wire 23 is particularly coated with an insulating coating. Insulating columns 1 2. 1
Insulating support rods 25, 25 crossed between adjacent 2'
The above-mentioned insulating support column 1 2. 1 and 2', and connected to a switching switch (not shown).

Further, as shown in FIGS. 6 to 8, the lead wire 23 is
The connection terminal portion 19 of the current collector ring 18 is led out horizontally to the outside of the tap selector, and this lead-out portion 23' is fixed to the outer periphery of the lower flange 13 between adjacent insulating columns 12 so as to be parallel to the above-mentioned insulating columns 12. The lead wire 23 is clamped to the upper end surface of the insulating support plate 28 which is held upright by a clamping plate 29.
is fixed, and the current collecting ring 18 is fixedly supported via the lead wire 23 to prevent co-movement with the movable contact 14.
The tap selection may be performed by bringing the movable contact 14 into slidable contact with the outer peripheral edge of the movable contact 14.

Furthermore, as shown in FIG. 9, the rising portions of the two or three lead wires 23, which are arranged at six equal intervals on the outside of the tap selector, are made of hard wood or the like in an arc shape. After fitting into lead insertion grooves 31 formed on the outer surface of the formed insulating support curved plate 30 in accordance with the lead-out interval of the lead wires 23,
The plurality of lead wires 23 are fixed and supported by the insulating support curved plate 30 at appropriate lead-out intervals by being fastened from the outside by the support plate 32, and the current collecting ring 18 is fixed and supported via the lead wires 23. It may also be configured such that the movable contact 14 is brought into sliding contact with the movable contact 14 to perform tap selection.

In the embodiment, the lead wire 23 has been described as a copper rod or a copper pipe, but the present invention is not limited to this.

It goes without saying that it may be made of steel in the form of a strip, or any conductive material that can prevent the current collecting ring 18 from cooperating with the movable contact 14 and securely support it on the support member.

As described above, in the present invention, the insulated drive shaft 11 is disposed at the center and the movable contact 14 is attached thereto so as to be able to move together integrally, and the current collecting ring 18 is connected to the insulated drive shaft 11 of the movable contact 14. A lead wire 23 made of a copper rod or copper pipe is rotatably supported on the upper surface of the mounting part of the current collector ring 18, and a lead wire 23 using a copper rod or copper pipe is mounted on the flat surface of one side of the current collecting ring 18.
The lead wires 23 are led out at equal intervals of X around the outer periphery of the tap selector and are supported and fixed by an insulating support member, and the current collecting ring 18 is connected to the lead wires 18. The lead wire is fixedly supported via a wire 23 to prevent co-movement with the movable contact 14, and the contact piece 16 of the movable contact 14 is slidably brought into contact with the tap selection. There is no need to consider the insulation distance between the lead wires or between the lead wires and other current collecting ring tightening ports, etc. of different potentials, as in the conventional case where the lead wires are led out through the insulating cylinder in the center, and the tap Not only can the selector as a whole be made extremely compact, but since the lead wires are arranged with a sufficient insulation distance, there is no need for insulation processing such as insulation coating, and the current can be collected at the center axis of the insulating tube. There is no need for machining such as creating bolt holes for fixing the ring by bolting or holes for lead wires, and there is no loss of mechanical strength. Connections are made visually, allowing for quick and easy assembly.In addition, lead wires can be connected only after the parts are assembled, unlike conventional products where the lead wires are attached in advance and assembled. Therefore, the lead wires do not get in the way during assembly, and assembly can be easily performed in this respect as well.

Further, the lead wire is fixed by a support member in the middle of the lead-out part or the rising part, and is stably fixed without causing contact due to vibration unlike the conventional lead wire which is inserted through an insulating cylinder.

Moreover, since the current collecting ring is rotatably supported on the movable arm of the movable contact and is attached to the support member via the lead wire, it is easy to position the movable contact with the contact piece or to ensure levelness. This makes assembly work extremely easy as it requires almost no positioning work and is fixed by fixing the lead wire with a support member. Because it is firmly supported and good contact can be maintained, there is no abnormal wear of the current collection ring, etc., which not only makes the equipment smaller, but also has sufficient electrical and mechanical properties. It has many remarkable features, such as being able to manufacture a reliable tap selector at low cost.

[Brief explanation of the drawing]

1 and 2 are partial top views and longitudinal sectional side views showing the schematic structure of a conventional tag selector, and FIGS. 3 and 4 are partially enlarged views of essential parts of the tap selector of the present invention. FIG. 5 is a perspective view of the insulating support rod for supporting the lead wire in FIG. 4, and FIGS. 6 to 8 show other embodiments of the lead wire support structure of the present invention. , FIG. 6 is an enlarged top view of essential parts of a tap selector using this configuration, FIG. 7 is a side view of its lead wire support structure, and FIG. 8 is a front view. Further, FIG. 9 is an enlarged perspective view of a main part showing still another embodiment. 11: Two insulated drive shafts, 12: Insulated support column, 14: Two movable contacts, 18: Current collector ring, 23 Double lead wire, 25: Insulated support rod, 26: Fixed contact, 28: Insulated support plate, 30: Insulated support curve Board.

Claims (1)

[Scope of Claims] 1. A fixed contact is attached and the insulated drive shaft is rotatably supported at the center of the axis of the lower flange, which is connected by a plurality of insulating columns arranged at equal intervals around the outer periphery. A movable contact with a contact piece at the tip is attached to the insulated drive shaft so that it can move together, and a fixed contact attached to the insulating column is brought into contact with the contact piece of the movable contact, so that the movable contact A connecting terminal is integrally protruded from one side of the flat surface of the upper surface of the attachment part to the insulated drive shaft of the child, and a current collector ring whose outer periphery is in sliding contact with the contact piece of the movable contact is rotated to the movable contact. A lead wire made of a conductive material such as a rod or a pipe is connected to the connecting terminal portion of the current collector ring by tightening it and leading it out to the outside in the circumferential direction of the insulating column. The lead wire is fixed and supported by an insulating support member, and the current collecting ring is fixedly supported via the lead wire to prevent co-movement with the movable contact to perform tap selection. Tap selector for on-load tap switching device. 2. Claim 1, wherein the lead wire is fixed to the intersection of an insulating support rod loosely fitted to the insulating support rod at an intermediate point t' of the insulating support rod disposed on the outer periphery of the lead wire. Tap selector of the on-load tap changing device described. 3. Claim 1, wherein the lead wire is integrally fixed by a clamping plate to the upper end of an insulating support plate that is disposed upright on the outer periphery of a lower flange connected by an insulating support. Tap selector for on-load tap changing device. 4. During loading as set forth in claim 1, the plurality of lead wires are integrally clamped and fixed by a support plate to an arc-shaped insulating support curved plate in which lead insertion grooves are bored in accordance with the lead-out intervals of the plurality of lead wires. Tap selector of tap change device.