JP6422686B2 - Tap selector - Google Patents

Description

  Embodiments described herein relate generally to a tap selector that arbitrarily selects a tap electrically connected to a predetermined position of a tap lead wire of a static induction appliance.

  In the tank of a static induction machine such as a transformer, a static induction machine body and a load tap changer are installed. This on-load tap changer is composed of a change-over switch that cuts off the load current at the time of load and flows the current to the adjacent tap, and a tap selector that selects the tap according to the load situation and switches the tap voltage. Yes. The static induction machine is connected to the tap selector via a tap lead.

  The tap selector includes a main switch having a plurality of main fixed contacts and a main movable contact, and a sub switch having a plurality of sub fixed contacts and a sub movable contact. The tap lead wire of the static induction device is connected to the main fixed contact of the main switch and the sub fixed contact of the sub switch via a crimp terminal. The crimp terminal is attached to the end of the tap lead wire. In addition, the connection point between each fixed contact and the tap lead wire is insulated by winding an insulating paper.

JP-A-9-009623

  By the way, the sub movable contact of the sub switching device is installed in the vicinity of a part of the main fixed contact of the main switching device. Accordingly, when connecting the tap lead wire of the static induction device to such a main fixed contact, the space between the sub movable contact of the sub switch and the fixed contact of the main switch is narrow, and the tap lead wire connection and Insulating paper winding workability may be reduced.

  Further, when the diameter of the tap lead wire is increased, the tap lead wire may come into contact with the movable contact of the sub-switcher. Furthermore, since the width of the crimp terminal increases as the diameter of the tap lead wire increases, it has been considered that the connection point between the tap lead wire and the main fixed contact contacts the sub movable contact of the sub switch. In order to avoid such contact with the sub-movable contact, the tap selector becomes large, and there is a possibility that the economy is deteriorated.

  Furthermore, even if the structure of the tap selector can be changed to avoid contact of the contact point with the sub movable contact, if the structure becomes complicated, the insulation configuration may be insufficient and safety may be reduced. .

  The embodiment of the present invention has been proposed in order to solve the above-described problems of the prior art. An object of the present invention is to provide a tap selector that improves connection workability and improves safety with a simple and inexpensive structure.

Tap selector of the embodiment for achieving the above object, the perforated a plurality of main columns located on the same circumference, a plurality of main fixed contacts attached to the main strut main selector exchanger When, in the main switching includes a secondary switcher provided in a specific position of the exchanger, the tap selector to be connected to a stationary induction apparatus of the tap leads via at least one of the main fixed contact, the main A relay strut is provided in a region other than the space between the main strut facing the sub switch and the sub switch among the plurality of main struts of the switch, and the tap lead wire is provided on the relay strut. connected thereto relay contacts are provided so as to be located in a region other than the space, the relay contacts, the main fixed contact of the main strut facing the auxiliary switching device is characterized Rukoto connected.

It is an example of arrangement | positioning of the tap selector in a static induction machine. It is a front view which shows an example of a structure of the tap selector of 1st Embodiment. It is a perspective view which shows an example of a structure of the tap selector of 1st Embodiment. It is AA sectional drawing of the tap selector of FIG. It is a perspective view which shows an example of a structure of the relay support | pillar (A) and main support | pillar (B) of the tap selector of 1st Embodiment. It is a perspective view which shows an example of a structure of the relay contact (A) and main fixed contact (B) of the tap selector of 1st Embodiment. It is a perspective view which shows an example of a structure of the relay connection line of the tap selector of 1st Embodiment. It is sectional drawing (A) which shows an example of a structure of the conventional tap selector, and an enlarged view (B) which shows the space between a main fixed contact and a sub movable contact. It is a wiring diagram which shows an example of the wiring of the relay connection line of the tap selector of 1st Embodiment, (A) is a case where a relay connection line is formed on a straight line, (B) is a relay connection line is U It is a wiring diagram at the time of forming in a letter shape.

[1. First Embodiment]
[1.1 Arrangement Example of First Embodiment]
A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an arrangement example of tap selectors according to the present embodiment in a static induction machine. In the transformer which is an example of the static induction electric machine shown in FIG. 1, insulating oil is enclosed in the tank N, and the transformer E around which the winding E2 is wound around the iron core E1 is housed.

  In addition, a load tap changer D for adjusting the voltage during operation of the transformer E is accommodated in the tank N. This on-load tap changer D includes a changeover switch S and a tap selector T driven by a drive shaft. The switching switch S and the tap selector T are electrically connected by an internal conductor. The winding E2 and the tap selector T are electrically connected by a tap lead wire L.

[1.2 Configuration of First Embodiment]
2 to 4 show an example of the tap selector T arranged in this manner. FIG. 2 is a front view, FIG. 3 is a perspective view, and FIG. 4 is a cross-sectional view taken along line AA in FIG. The number and shape of each member of the tap selector T described below are merely examples for explaining the present embodiment, and are not limited thereto.

  The tap selector T includes a main switch 1 connected to the switching switch S and a sub switch 2 that operates only at a specific position of the main switch 1. A drive mechanism 51 is provided in the upper part of the main switch 1 and the drive mechanism 51 operates a member such as a main movable contact described below.

(Main switch 1)
The main switch 1 has an insulating cylinder 3 having upper and lower ends fixed at the center, and six current collecting rings 4 are provided on the outer peripheral surface of the insulating cylinder 3 at equal intervals in the axial direction. The current collecting ring 4 is connected to the switching switch S from the inner peripheral side by a connection line 5 housed in the insulating cylinder 1. A main movable contact 6 is attached to each of the current collecting rings 4.

  In addition, on the outer peripheral side of the insulating cylinder 3, five main columns 7 (shown as 7 a to 7 e in FIG. 4) and the relay column 14 are parallel and concentric with the insulating cylinder 3 with a space from the insulating cylinder 3. It is provided on the same circumference. The five main struts 7 are arranged at equal intervals on the same circumference. The five main struts 7 are fixed to the upper end support 52 at the upper end and to the lower end support 53 at the lower end. As shown in FIG. 4, one main strut 7 a among the five main struts 7 is arranged in the vicinity of the sub-switching device 2. The relay column 14 will be described in detail later.

  Six main fixed contacts 8 are attached to each of the five main struts 7 at equal intervals in the longitudinal direction. Therefore, when the main fixed contacts 8 attached to the five main columns 7 are combined, the five main fixed contacts 8 provided on the same plane orthogonal to the axis of the insulating cylinder 3 are arranged in six stages. It will be.

  The six main fixed contacts 8 attached to each of the five main columns 7 are composed of three M1 fixed contacts (8a, 8c, 8e) and three M2 fixed contacts (8b, 8d, 8f). ing. The main fixed contact 8 has contacts on the inner peripheral side and the outer peripheral side, respectively. The main movable contact 6 sequentially selects contacts on the inner peripheral side of the main fixed contact 8 and forms an energization path between the main fixed contact 8 and the current collecting ring 4.

(Sub-switch 2)
The sub-switch 2 is provided at a specific position of the main switch 1 (in the present embodiment, in the vicinity of the column 7a), and the sub-movable contact 10 operates at this specific position. Specifically, the sub-switcher 2 is provided with a drive mechanism 54 in the upper part and a sub-insulating shaft 9 in which the lower part is slidably supported by a bearing in parallel with the insulating cylinder 3. Three auxiliary movable contacts 10 are attached to the auxiliary insulating shaft 9 at equal intervals in the longitudinal direction.

  The three sub movable contacts 10 are attached to positions corresponding to the M2 fixed contacts (8b, 8d, 8f) of the main switch 1, respectively. The sub movable contact 10 bridges a sub fixed contact 12 described later to form an energization path.

  Three sub struts 11 (11a to 11 in FIG. 4) are arranged on the opposite side of the surface of the sub-insulating shaft 9 toward the main switch 1 so as to be arranged in parallel with the sub-insulating shaft 9 with the sub movable contact 10 interposed therebetween. 11c) is provided with the upper and lower ends fixed. Three auxiliary fixed contacts 12 are attached to each of the auxiliary columns 11 at equal intervals in the axial direction. Therefore, when the sub fixed contacts 12 attached to the sub struts 11a to 11c are combined, three sub fixed contacts 12 (12a to 12c in FIG. 4) provided on the same plane orthogonal to the axis of the insulating cylinder 3 are combined. Will be arranged in three stages.

  The three-stage sub-fixed contacts 12 are provided at positions corresponding to the three sub-movable contacts 10, respectively. Specifically, for example, as shown in FIG. 4, the M2 fixed contact 8 f of the main switch 1, the sub movable contact 10 a arranged at the top of the three sub movable contacts 10, and the three-stage sub fixed contacts Three sub-fixed contacts 12 a to 12 c arranged at the uppermost part of 12 are arranged on the same plane orthogonal to the insulating cylinder 3 of the main switch 1. In the other stages, the sub movable contact 10 and the sub fixed contact 12 are arranged on the same plane orthogonal to the insulating cylinder.

  The sub movable contact 10 is configured to slide at a specific position of the main switching device 1 so as to switch the inner peripheral side of the sub fixed contacts 12a and 12b among the three sub fixed contacts 12a to 12c. Yes. A tap lead wire L is connected to the contacts on the outer peripheral side of the sub-fixed contacts 12a and 12b.

  Further, the sub fixed contact 12c is connected to the M1 fixed contact (8a, 8c, 8e) of the main switch 1 respectively. Specifically, for example, as shown in FIG. 4, the auxiliary fixed contact 12c attached on the same plane as the M2 fixed contact 8f is connected to the M1 fixed contact 8e.

(Relay post and relay contact)
In the configuration as described above, the relay switch 14 is provided in the main switch 1 of the present embodiment as described above. The relay support 14 is provided with a relay contact 16. The tap lead wire L is electrically connected to the main fixed contact 8 of the main switch 1 via the relay contact 16.

  More specifically, as shown in FIG. 4, the relay column 14 is provided on the same circumference as the five columns 7 between the main column 7 a and the column 7 b adjacent to the main column 7 a in a space. ing. Three relay contacts 16 are attached to the relay column 14 at equal intervals in the longitudinal direction.

  The relay contact 16 attached to the relay column 14 will be described with reference to FIGS. 5 and 6. 5A shows the relay column 14 and FIG. 5B shows the main column 7. The relay contacts (16b, 16d, 16f) are attached at positions corresponding to the M2 fixed contacts (8b, 8d, 8f) to which the tap lead wire L is connected among the main fixed contacts 8 attached to the main support column 7. ing. Therefore, for example, as shown in FIG. 4, in addition to the main fixed contact 8f, the sub movable contact 10a, and the three sub fixed contacts 12a to 12c, the relay contact 16f is also orthogonal to the insulating cylinder 3 of the main switch 1. They are arranged on the same plane.

  6A shows the relay contact 16 and FIG. 6B shows the main fixed contact 8. The relay contact 16 and the main fixed contact 8 are formed using the same member, and are attached by being inserted through through holes provided in the relay support 14 and the main support 7, respectively.

  More specifically, the main fixed contact 8 includes a main shaft 8w inserted through the through hole of the main column 7 and a ring-shaped member 8x attached to both ends of the main shaft 8w and sandwiching the main column 7 from both sides. The main shaft 8 w has an inner peripheral side contact 8 y switched by the main movable contact 6 and an outer peripheral side contact 8 z connected to the tap lead wire L. The contact 8y and the contact 8z are obtained by providing a through-hole in a flat member. The main shaft 8w and the ring-shaped member 8x are fastened and fixed by a fixing tool (not shown) and attached to the main column 7 as the main fixed contact 8.

  The relay contact 16 includes a main shaft 16w that is inserted through the through hole of the relay column 14, and a ring-shaped member 16x that is attached to both ends of the main shaft 16w and sandwiches the relay column 14 from both sides. Further, the main shaft 16w has an outer peripheral side contact 16z connected to the tap lead wire L. The contact 16z is a plate-shaped member provided with a through hole. The main shaft 16w and the ring-shaped member 16x are fastened and fixed by a fixing tool (not shown) and attached to the relay column 14 as the relay contact 16.

  Of the main fixed contacts 8, the contact 8z on the outer peripheral side of the M2 fixed contacts (8b, 8d, 8f) of the main column 7a is connected to the relay contact 16 of the relay column 14 by the relay connection line 17. As shown in FIG. 7, the relay connection line 17 is an integrally molded product made of a metal such as copper, for example, and has through holes 17 a in flat plate members formed at both ends. An insulating paper 18 is wound around the relay connection line 17. The relay connection line 17 may be integrally formed in a substantially U-shaped member from one end to the other end.

[1.2 Action]
The operation of the present embodiment having the above-described configuration will be described below in comparison with the prior art that does not have the relay support 14. As shown in FIG. 8A, in the conventional tap selector T, the tap lead wire L is connected to the contact on the outer peripheral side of the main fixed contact 8 of the main struts 7b to 7e via a crimp terminal. Further, the contacts on the outer peripheral side of the M1 fixed contacts (8a, 8c, 8e) of the main column 7a are connected to the sub fixed contact 12c. Further, the tap lead wire L is connected to the M2 fixed contact (8b, 8d, 8f) of the main column 7a via a crimp terminal.

  On the other hand, in the connection in the tap selector T of the present embodiment, the tap lead wire L is connected to the contact on the outer peripheral side of the main fixed contact 8 of the main struts 7b to 7e via the crimp terminal. Further, the contact 8z on the outer peripheral side of the M1 fixed contact (8a, 8c, 8e) of the main column 7a is connected to the sub fixed contact 12c. However, in the main support column 7a, the tap lead wire L is electrically connected to the contact 8z on the outer peripheral side of the M2 fixed contact (8b, 8d, 8f) via the three relay contacts 16 of the relay support column 14. The

  Specifically, as shown in FIG. 3, the tap lead L is connected to the relay contact (16b, 16d, 16f) of the relay support 14 via a crimp terminal. As shown in FIG. 4, the relay contact 16 is connected to the M2 fixed contact (8 b, 8 d, 8 f) via the relay connection line 17.

  The through hole 17a at one end of the relay connection line 17 is fixed to a contact 16z on the outer peripheral side of the relay contact (16b, 16d, 16f) with a bolt or the like and connected to the relay contact (16b, 16d, 16f). The Also, the through hole 17a at the other end of the relay connection line 17 is fixed to the contact 8z on the outer peripheral side of the M2 fixed contact (8b, 8d, 8f) by a bolt or the like and fixed to the M2 fixed contact (8b, 8d, 8f). Each connection point is insulated by being wound with insulating paper. As described above, the tap lead wire L is electrically connected to the M2 fixed contact (8b, 8d, 8f).

[1.3 Effect]
The effects of the present embodiment as described above are as follows.
(1) In the case of the prior art, the tap lead wire L is directly connected to the contact 8z on the outer peripheral side of the M2 fixed contact (8b, 8d, 8f) also in the main support column 7a arranged in the vicinity of the sub-switcher 2. It was. As shown in FIG. 8B, the space P between the sub-switcher 2 and the main support column 7a is narrow. Furthermore, a crimp terminal may be attached to the tip of the tap lead wire L, and the work of connecting the tap lead wire L and the insulating paper winding in the space P may be deteriorated.

  However, in the tap selector T of the present embodiment, the relay column 14 provided with the relay contact 16 is provided. Therefore, in the main support column 7a, the tap lead wire L can be electrically connected to the contact 8z on the outer peripheral side of the M2 fixed contact (8b, 8d, 8f) via the relay contact 16. Therefore, it is not necessary to connect the tap lead wire L and wind the insulating paper in the space P. That is, tap lead wire connection and insulating paper winding work can be performed in the vicinity of the relay post 14 having a wider space, and workability can be improved.

(2) Further, the relay contact 14 provided on the same circumference as the main support 7 is connected to the relay contact 14 at a position corresponding to the M2 fixed contact (8b, 8d, 8f) among the main fixed contacts 8 of the main support 7. (16b, 16d, 16f) are provided. Therefore, since the conventional basic structure of the tap selector T can be utilized, it is possible to provide a simple and inexpensive relay connection structure that is highly compatible with the current product. Further, the structure of the tap selector T is not complicated, and the insulation can be maintained, so that there is no risk of reducing the safety.

(3) Since the main fixed contact 8 and the relay contact 16 are formed using the same member, the assembly work of the main column 7 and the relay column 14 can be performed in the same manner. In addition, since it is not necessary to newly manufacture parts for the relay structure, a simple and inexpensive relay structure can be provided.

(4) Since the relay connection line 17 is a metal batch-molded product, the manufacturing process of the relay connection line 17 can be reduced, and a simple and inexpensive relay structure can be provided.

(5) Furthermore, compared to the case where the relay connection line 17 is formed in a straight line as shown in FIG. 9A, the relay connection line 17 is formed in a substantially U shape as shown in FIG. 9B. Thereby, the insulation distance with the sub movable contact 10 becomes long, and it can improve safety | security further.

  (6) As described in detail in (1) above, by providing the relay strut 14 and making the relay connection line 17 as an integrally molded product made of metal, there is no need to use a crimp terminal, The distance of expanded. Therefore, it is not necessary to wind insulating paper around the relay connection line 17. However, a shield cap 20 as shown in FIG. 9 can be used to alleviate the generated electric field. The shield cap 20 has caps 21 and 22 having insulating properties formed in a substantially half shape. The shield cap 20 relaxes the electric field generated when the caps 21 and 22 are fastened and fixed together with the contact 8z on the outer peripheral side of the main fixed contact 8 and the contact 16z on the outer peripheral side of the relay contact 16 by the bolt 23.

  Even when the shield cap 20 is used, there is no need to connect the tap lead wire L and attach the shield cap 20 in the main column 7a. Therefore, it is possible to connect the tap lead wires and attach the shield cap 20 in the vicinity of the relay post 14 having a wider space, and the workability can be improved.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

N ... Tank E ... Transformer E1 ... Iron core E2 ... Winding D ... Load tap switch S ... Switching switch T ... Tap selector L ... Tap lead wire 1 ... Main switch 2 ... Sub-switch 3 ... Insulating cylinder 4 ... Current collecting ring 5 ... Connection line 6 ... Main movable contacts 7, 7a, 7b, 7c, 7d, 7e ... Main struts 8, 8a, 8b, 8c, 8d, 8e, 8f ... Main fixed contact 9 ... Sub-insulating shaft 10 ... Sub movable contact 11, 11a, 11b, 11c ... Sub strut 12, 12a, 12b, 12c ... Sub fixed contact 14 ... Relay strut 16, 16b, 16d, 16f ... Relay contact 17 ... Relay connection line 18 ... Relay connection line 20 ... Shield caps 21, 22 ... Cap 23 ... Bolt 52 ... Upper end support 53 ... Lower end support 54 ... Drive mechanism

Claims (5)

A plurality of main columns located on the same circumference, the main selector exchanger which have a plurality of main fixed contacts mounted to the main post, and secondary switcher provided in a specific position of the main switching device, in the a tap selector which is connected to a stationary induction apparatus of the tap leads via at least one of the main fixed contact,
Among the plurality of main columns of the main switch, a main column facing the sub switch, and a relay column is provided in a region other than the space between the sub switch ,
The relay support is provided with a relay contact to which the tap lead wire is connected located in a region other than the space, and the relay contact has the main fixed contact of the main support facing the sub-switcher. tap selector, characterized in Rukoto but connected. The relay column is provided on the same circumference as the main column,
2. The tap selector according to claim 1, wherein the relay contact is provided at a position corresponding to a fixed contact to which the tap lead wire is connected.   The tap selector according to claim 1 or 2, wherein the fixed contact and the relay contact are formed using the same member. A relay connection line connecting the relay contact and the fixed contact is provided;
The tap selector according to any one of claims 1 to 3, wherein the relay connection line is a metal integrally formed product.   5. The tap selector according to claim 4, wherein the relay connection line is a U-shaped member.