JP2011187889A - Tap selector of on-load tap changer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tap selector of an on-load tap changer such that connection structures of input lines are simplified to improve operability and an assembly state is confirmed directly from outside. <P>SOLUTION: An insulating shaft 4 has one end and the other end in a length direction. A first input line extends in the length direction along an outer side face of the insulating shaft 4 to electrically connect a first changeover switch terminal 14 to an even-side current collecting contact 6A. A second input line extends in the length direction along the outer side face of the insulating shaft 4 to electrically connect a second changeover switch terminal 14 to an odd-side second current collecting contact 6B. The first current collecting contact 6A has a hole portion corresponding to a position of the first current collecting contact 6A in which the second input line extends. The second input line is arranged at an interval with the first input line in a peripheral direction of the insulating shaft 4 to be inserted into the hole portion. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a tap selector of an on-load tap changer.

  As a prior document disclosing the structure of a tap selector of a conventional on-load tap changer, there is Patent Document 1. Patent Document 1 discloses, as an invention, a tap selector of a load tap changer having the structure shown in FIGS. 1 and 2, and a tap of a load tap changer having a structure of FIGS. A selector is described.

  In the tap selector of the conventional load tap changer described above, the movable contact slides on the current collecting surface of the current collecting plate without interfering with the connection conductor and the conducting portion of the other phase, and thus the fixed contact. Can move between.

  In the tap selector of the conventional on-load tap changer having the structure shown in FIGS. 1 and 2 of Patent Document 1, the connecting conductor is fixed to the connecting contact protruding from the upper surface of the current collector plate and horizontally And connected to a switching switch led out of the tap selector. The movable arm and the movable contact are arranged below the connection conductor and fixed to the insulating shaft so as not to interfere with the connection conductor when the movable contact operates.

  In the tap selector of the conventional on-load tap changer having the structure shown in FIGS. 4 and 5 of Patent Document 1, a connection conductor is provided inside an insulating cylinder to which a current collecting ring is attached. The connection conductor is passed through the inside of the insulating cylinder and connected to the switching switch. The movable contact is fixed to an insulating drive plate that rotates on a concentric shaft with the insulating shaft, and is movable without interfering with the connection conductor.

Japanese Utility Model Publication No. 61-106020

  In the tap selector of the on-load tap changer having the structure shown in FIGS. 1 and 2 of Patent Document 1, the connection conductor passes through the vicinity of the fixed contact when the connection conductor is pulled out of the tap selector; Therefore, there was a problem from the viewpoint of insulation.

  In the tap selector of the on-load tap changer having the structure shown in FIGS. 4 and 5 of Patent Document 1, the connecting conductor is disposed inside the insulating cylinder, so that the connecting conductor is L-shaped during assembly. There is a problem that the manufacturing cost of the tap selector increases due to poor assembly, such as inserting into an insulating cylinder with the terminal attached, or pulling out the L-shaped terminal from the through hole in a groping state and connecting it to the current collecting ring. there were. Furthermore, since the connection conductor is disposed inside the insulating cylinder, there is a problem that the state of the connection conductor cannot be confirmed after assembly.

  The present invention has been made in view of the above-described problems, and allows the input line to be connected to the current collecting contact with a simple structure without interfering with the operation of each movable contact, and improves workability. It is an object of the present invention to provide a tap selector for an on-load tap changer that can reduce the manufacturing cost and can directly check the assembly state from the outside.

  The tap selector of the on-load tap changer according to the present invention selects one tap lead from a plurality of tap leads drawn from the winding of the transformer, thereby selecting the selected tap, the switching switch, It is a tap selector of the on-load tap changer that connects. The tap selector of the load tap changer includes an insulating shaft, a first current collecting contact, a second current collecting contact, a first fixed contact, a second fixed contact, a first movable contact, a second movable contact, and a first input line. And a second input line. The insulating shaft has one end and the other end in the longitudinal direction. The first current collecting contact is attached to one end side of the insulating shaft, and extends in the circumferential direction of the insulating shaft outside the insulating shaft. The second current collecting contact is attached to the other end side of the insulating shaft at a distance from the first current collecting contact in the longitudinal direction, and extends in the circumferential direction of the insulating shaft outside the insulating shaft. The first fixed contacts are spaced from each other on the same circumference around the first current collecting contact with the insulating shaft as the center. The second fixed contacts are arranged at intervals from each other on the same circumference around the second current collecting contact with the insulating shaft as the center. The first movable contact can be slidably contacted with the first current collecting contact on the same circumference around the first current collecting contact with the insulating shaft as the center, and is selected from a plurality of first fixed contacts. The two first fixed contacts and the first current collecting contact are connected. The second movable contact can be slidably contacted with the second current collecting contact on the same circumference around the second current collecting contact with the insulating shaft as a center, and is selected from a plurality of second fixed contacts. One second fixed contact and the second current collecting contact are connected. The first input line extends in the longitudinal direction along the outer surface of the insulating shaft, and has one end connected to the first current collecting contact and the other end penetrating the Geneva gear mechanism portion to the terminal of the switching switch. Is electrically connected. The second input line extends in the longitudinal direction along the outer surface of the insulating shaft, and has one end connected to the second current collecting contact and the other end penetrating the Geneva gear mechanism portion to the terminal of the switching switch. Is electrically connected. The 1st current collection contact has a hole corresponding to a position where the 2nd input line in the 1st current collection contact extends. The second input line is disposed at a distance from the first input line in the circumferential direction of the insulating shaft and is inserted through the hole.

  The present invention has been made to solve the above-described problems. The input line extends in the longitudinal direction along the outer surface of the insulating shaft and is connected to the current collecting contact, and from one end of the insulating shaft. By pulling out, the input line can be connected with a simple structure without interfering with the operation of each movable contact, and the manufacturing cost can be reduced, and the assembly state can be confirmed directly from the outside. To obtain a tap selector.

It is a side view which shows typically the structure of the tap switch at the time of load which concerns on one Embodiment of this invention. It is a perspective view which shows typically the structure of the current collection contact part in the tap selector of the tap switch at the time of load which concerns on the embodiment. It is sectional drawing seen from the III-III line arrow direction of FIG. It is a figure which shows typically the electrical connection of the tap of the coil | winding of the transformer which concerns on the same embodiment, and a load tap changer. It is sectional drawing which shows typically the structure of the input line which concerns on the embodiment.

  Hereinafter, a tap selector of an on-load tap changer according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view schematically showing a configuration of a load tap changer according to an embodiment of the present invention. FIG. 2 is a perspective view schematically showing the structure of the current collecting contact portion in the tap selector of the on-load tap changer according to the present embodiment. FIG. 3 is a cross-sectional view as seen from the direction of arrows III-III in FIG. In FIG. 3, for convenience of explanation, a connecting pin 18 described later is shown in a sectional view.

  The on-load tap changer is a device for selecting one tap from a plurality of taps of the transformer winding. In the present embodiment, a load current is passed through the tap selector 3 from the winding side of the transformer via the tap lead. The load current flows in the order of the tap selector 3, the switching switch 2, and the winding of the transformer via the tap lead drawn from the winding of the transformer. In the tap selector 3, the fixed contact 9 is divided into two groups, an odd-side fixed contact group connected to the odd-side tap group and an even-side fixed contact group connected to the even-side tap group. . Here, the tap is a drawing connection point provided in the middle of the transformer winding, and the tap of the transformer is connected to the fixed contact by a tap lead.

  As shown in FIG. 1, in the on-load tap changer 1 according to an embodiment of the present invention, a switching switch 2 is arranged above the tap selector 3.

  The switching switch 2 has a function of performing circuit switching in a conductive state. The input line 11 of the tap selector 3 is connected to the switching switch terminal 14 arranged on the outer surface of the switching switch 2.

  As shown in FIGS. 1 to 3, the tap selector 3 includes an insulating shaft 4, an odd-side current collecting contact 6 </ b> A that is a first current collecting contact, an even-side current collecting contact 6 </ b> B that is a second current collecting contact, and a first fixed. An odd-numbered fixed contact 9A, a second fixed contact 9B, an odd-numbered movable contact 7A as a first movable contact, an even-numbered movable contact 7B as a second movable contact, and a first input line. An input line 11A and an input line 11B as a second input line are provided.

  The insulating shaft 4 is arranged in the tap selector 3 such that the longitudinal direction is the vertical direction, and has an upper end that is one end and a lower end that is the other end. The insulating shaft 4 is made of an insulating material, and is made of, for example, a glass fiber reinforced plastic containing an epoxy resin.

  A plurality of current collecting contacts 6 are attached to the insulating shaft 4 at predetermined intervals. The current collecting contact 6 is made of a conductive material. As described above, since the tap is divided into the odd-numbered tap group and the even-numbered tap group, two current collecting contacts 6 are required for each phase of the power source.

  In this embodiment, since it is used with a three-phase power supply, the tap selector 3 has six current collecting contacts 6A, 6B, 6C, 6D, 6E, and 6F. For example, the current collecting contacts to which the current of the first phase is input are the odd-numbered current collecting contacts 6A and the even-numbered current collecting contacts 6B. The current collecting contacts to which the current of the second phase is input are the odd-numbered current collecting contacts 6C and the even-numbered current collecting contacts 6D. The current collecting contacts to which the current of the third phase is input are the odd-numbered current collecting contacts 6E and the even-numbered current collecting contacts 6F.

  In the current collecting contact 6, the current collecting contact 6 attached to the upper end side of the insulating shaft 4 is used as a first current collecting contact, and the current collecting contact 6 attached to the lower end side of the insulating shaft 4 with respect to the first current collecting contact. Is the second current collecting contact.

  Hereinafter, the odd-numbered current collecting contact 6A will be described as the first current collecting contact, and the even-numbered current collecting contact 6B will be described as the second current collecting contact. However, the first current collecting contact and the second current collecting contact are limited to this combination. I can't.

  As shown in FIG. 2, the odd-numbered current collecting contact 6 </ b> A is attached to the upper end side of the insulating shaft 4 and extends in the circumferential direction of the insulating shaft 4 outside the insulating shaft 4. The even-side current collecting contact 6B is attached to the lower end side of the insulating shaft 4 with a distance in the longitudinal direction from the odd-side current collecting contact 6A, and extends in the circumferential direction of the insulating shaft 4 outside the insulating shaft 4.

  In the present embodiment, as shown in FIG. 3, six fixed contact shafts 17 are arranged at intervals from each other on the same circumference around the insulating shaft 4 with the insulating shaft 4 as the center. . Each of the odd-numbered fixed contact group and the even-numbered fixed contact group is composed of six fixed contacts 9. However, the number of the fixed contact shafts 17 is not limited to six. The fixed contact shaft 17 is made of an insulating material.

  The fixed contact 9 is attached to the fixed contact shaft 17 at a predetermined interval so as to correspond to the attachment position of the current collecting contact 6 on the insulating shaft 4. The same six fixed contacts 9 as the current collecting contacts 6 are attached to one fixed contact shaft 17. The fixed contact 9 is made of a conductive material such as copper.

  The fixed contact 9 provided so as to correspond to the odd-side current collecting contact 6A is referred to as an odd-side fixed contact 9A, and the fixed contact 9 provided so as to correspond to the even-side current collecting contact 6B is referred to as an even-side fixed contact 9B. . Similarly, the odd-numbered fixed contact 9C corresponds to the odd-numbered current collecting contact 6C, the even-numbered fixed contact 9D corresponds to the even-numbered current collecting contact 6D, and the odd-numbered fixed contact 9E corresponds to the odd-numbered current collecting contact. Corresponding to the contact 6E, the even-numbered fixed contact 9F corresponds to the even-side current collecting contact 6F.

  As shown in FIG. 3, the odd-numbered fixed contacts 9A are arranged on the same circumference around the odd-numbered current collecting contacts 6A with the insulating shaft 4 as the center, and taps of the corresponding transformer windings. Each lead is connected. The odd-numbered fixed contact 9A is formed with a screw hole for fixing the tap lead of the transformer winding with a bolt.

In the present embodiment, the odd-numbered fixed contact group is composed of six fixed contacts (first, third, fifth, ninth, eleventh fixed contacts). Therefore, the odd-numbered-side fixed contact 9A, an odd-side fixed contact 9A ₁ connected to the first tap leads, an odd-side fixed contact 9A ₃ which is connected to the third tap leads, connected to the 5 th tap leads an odd-side fixed contact 9A ₅ is, an odd-side fixed contact 9A ₇ connected to the 7-th tap leads, an odd-side fixed contact 9A ₉ which is connected to the 9 th tap leads, the 11-th tap leads and a odd fixed contact 9A ₁₁ Metropolitan connected.

  The even-numbered fixed contacts 9B are arranged on the same circumference around the even-numbered current collecting contacts 6B with the insulating shaft 4 as the center, and the tap leads of the corresponding transformer windings are connected to each other. The even-numbered fixed contact 9B has a screw hole for fixing the tap lead of the transformer winding with a bolt.

The even-numbered fixed contact group is composed of six fixed contacts (second, fourth, sixth, eighth, tenth and twelfth fixed contacts). Therefore, the even-side fixed contact 9B, an even-side fixed contact 9A ₂ connected to the second tap leads, an even fixed contact 9A ₄ which is connected to the fourth tap leads, connected to the 6 th tap leads an even-side fixed contact 9A ₆ is, an even-side fixed contact 9A ₈ which is connected to the eighth tap leads, the even side fixed contact 9A ₁₀ which is connected to the 10-th tap leads, the 12-th tap leads The even-numbered fixed contact 9A ₁₂ is connected.

  As shown in FIG. 1, two movable contact shafts 8 for the odd-numbered movable contact 7 </ b> A and the even-numbered movable contact 7 </ b> B are provided on the same circumference around the insulated shaft 4 with the insulating shaft 4 as the center. Is provided. The movable contact shaft 8 is provided between the insulating shaft 4 and the fixed contact shaft 17. The movable contact shaft 8 is provided so as to be able to go around between the fixed contact shafts 17 around the insulating shaft 4.

  On the one movable contact shaft 8A, three odd-side movable contacts 7A, 7C, 7E are attached so as to correspond to the three odd-side fixed contacts 9A, 9C, 9E connected to the odd-numbered tap lead group. Yes. The odd-side movable contact 7A corresponds to the odd-side fixed contact 9A, the odd-side movable contact 7C corresponds to the odd-side fixed contact 9C, and the odd-side movable contact 7E corresponds to the odd-side fixed contact 9E.

  On the other movable contact shaft 8B, even-numbered movable contacts 7B, 7D, and 7F are attached so as to correspond to the three even-numbered fixed contacts 9B, 9D, and 9F connected to the even-numbered tap lead group. The even side movable contact 7B corresponds to the even side fixed contact 9B, the even side movable contact 7D corresponds to the even side fixed contact 9D, and the even side movable contact 7F corresponds to the even side fixed contact 9F.

As shown in FIG. 3, the odd-numbered movable contact 7 </ b> A can move by sliding on the odd-numbered current collecting contact 6 </ b> A around the insulating shaft 4 on the same circumference around the odd-numbered current collecting contact 6 </ b> A. By moving the odd-numbered movable contact 7A, the odd-numbered fixed contact 9A can be alternately turned on and off. As a result, the odd-side movable contact 7A has one odd-side fixed contact 9A selected from a plurality of odd-side fixed contacts (9A ₁ , 9A ₃ , 9A ₅ , 9A ₇ , 9A ₉ , 9A ₁₁ ) and an odd-side collection. The electrical contact 6A is connected.

The even-side movable contact 7 </ b> B can move while being in sliding contact with the even-side current collecting contact 6 </ b> B around the insulating shaft 4 on the same circumference around the even-side current collecting contact 6 </ b> B. By moving the even-side movable contact 7B, it is possible to alternately perform making and releasing on the even-side fixed contact 9B side. As a result, connecting a plurality of even-side fixed contact _{(9B 2, 9B 4, 9B} 6, 9B 8, 9B 10, 9B 12) 1 one even-side fixed contact 9B selected from the even-numbered side collecting contacts 6B ing.

  As shown in FIG. 1, an upper frame 12 is disposed on the tap selector 3. A lower frame 13 is disposed below the tap selector 3. The insulating shaft 4 is fixed to the upper frame 12 and the lower frame 13. The fixed contact shaft 17 is fixed by the upper frame 12 and the lower frame 13.

  A Geneva gear mechanism 5 is arranged between the switching switch 2 and the tap selector 3. A sub-switcher 15 is disposed on the side of the tap selector 3. The sub-switch 15 has a function of increasing the voltage adjustment range of the on-load tap switch 1. Although not shown, the sub-switcher 15 is provided with a fixed contact and a movable contact of the sub-switcher, and further with a fixed contact shaft to which the fixed contact is attached and a movable contact shaft to which the movable contact is attached. Yes. The fixed contact shaft of the sub-switcher 15 is fixed to the upper frame 12 and the lower frame 13.

  The movable contact shaft 8 of the tap selector 3 and the movable contact shaft of the sub-switcher 15 are connected to the Geneva gear mechanism 5. The movable contact 7 is moved by driving the movable contact shaft 8 of the tap selector 3 by the Geneva gear mechanism 5. Since the movable contact shaft 8A and the movable contact shaft 8B are driven separately, the odd-numbered movable contacts 7A, 7C, 7E and the even-numbered movable contacts 7B, 7D, 7F move separately. Further, the movable contact shaft of the sub-switcher 15 is moved by driving the movable contact shaft of the sub-switcher 15 by the Geneva gear mechanism unit 5.

  As shown in FIGS. 1 and 2, in the switching switch 2 and the tap selector 3, the corresponding current collecting contact 6 and the switching switch terminal 14 are each electrically connected by one input line 11. The Six input lines 11 are provided. The input line 11A is connected to the odd-numbered current collecting contact 6A, the input line 11B is connected to the even-numbered current collecting contact 6B, and the input line 11C is connected to the odd-numbered current collecting contact 6C. 11D is connected to the even current collecting contact 6D, the input line 11E is connected to the odd current collecting contact 6E, and the input line 11F is connected to the even current collecting contact 6F. Here, the input line 11A connected to the odd current collecting contact 6A as the first current collecting contact is the first input line, and the input connected to the even current collecting contact 6B as the second current collecting contact. Let line 11B be the second input line.

  In addition, in order to connect the input line 11 and the current collection contact 6, the connection terminal 10 is provided in each current collection contact 6. FIG. For example, the connection terminal 10 has a structure in which the input wire 11 is fixed to the current collecting contact 6 with bolts, and the input wire 11 is sandwiched and the input wire 11 and the current collecting contact 6 are electrically connected. .

FIG. 4 is a diagram schematically showing electrical connection between the winding tap of the transformer and the on-load tap changer 1 according to the present embodiment. In FIG. 4, only one phase of the three phases is shown. As shown in FIG. 4, a plurality of tap leads 16 are drawn from the winding 20 of the transformer. The tap lead 16 includes an odd-numbered tap lead group (16A ₁ , 16A ₃ , 16A ₅ , 16A ₇ , 16A ₉ , 16A ₁₁ ) and an even-numbered tap lead group (16B ₂ , 16B ₄ , 16B ₆ , 16B ₈ , 16B ₁₀ , 16B ₁₂ ).

  The tap leads 16 are connected to the corresponding fixed contacts 9. The odd-side movable contact 7A selects any one of these odd-side fixed contacts 9A and is connected to the odd-side current collecting contact 6A. The even-side movable contact 7B selects any of the even-side fixed contacts 9B and is connected to the even-side current collecting contact 6B. The odd-side movable contact 7C selects any one of the odd-side fixed contacts 9C and is connected to the odd-side current collecting contact 6C. The even-side movable contact 7D selects any one of the even-side fixed contacts 9D and is connected to the even-side current collecting contact 6D. The odd-numbered movable contact 7E selects any one of the odd-numbered fixed contacts 9E and is connected to the odd-numbered current collecting contact 6E. The even-side movable contact 7F selects any one of the even-side fixed contacts 9F and is connected to the even-side current collecting contact 6F.

  The switching switch 2 includes a switching switch terminal 14 connected to the input line 11A, a switching switch terminal 14 connected to the input line 11B, a switching switch terminal 14 connected to the input line 11C, and an input line. The switching switch terminal 14 connected to 11D, the switching switch terminal 14 connected to the input line 11E, and the switching switch terminal 14 connected to the input line 11F can be switched in a conductive state.

  As shown in FIGS. 1 to 3, the input line 11 </ b> A extends in the longitudinal direction along the outer surface of the insulating shaft 4 and is connected to the odd-numbered current collecting contact 6 </ b> A and is drawn to the upper end of the Geneva gear mechanism unit 5. And input to the switching switch terminal 14A. The input line 11B extends in the longitudinal direction along the outer surface of the insulating shaft 4 and is connected to the even-side current collecting contact 6B. The input line 11B is drawn to the upper end of the Geneva gear mechanism 5 and is input to the switching switch terminal 14B. Is done. The input line 11 </ b> B is arranged at a distance from the input line 11 </ b> A in the circumferential direction of the insulating shaft 4.

  In order for the input line 11B to extend in the longitudinal direction along the outer surface of the insulating shaft 4 from the even-numbered current collecting contact 6B to the upper end of the insulating shaft 4, the input line 11B needs to pass through the odd-numbered current collecting contact 6A. There is. For this reason, the odd-numbered current collecting contact 6A has a hole 19B corresponding to the position where the input line 11B extends in the odd-numbered current collecting contact 6A. The input line 11B is inserted through the hole 19B of the odd-number side current collecting contact 6A.

  In the present embodiment, since six input lines 11 are provided, the odd-number side current collecting contact 6A is provided with five holes 19. As described above, the input line 11B is inserted through the hole 19B, the input line 11C is inserted through the hole 19C, the input line 11D is inserted through the hole 19D, and the input line 11E is inserted through the hole 19E. The input line 11F is inserted through the hole 19F.

  Four holes 19 are provided in the even-side current collecting contact 6B. An input line 11C, an input line 11D, an input line 11E, and an input line 11F are inserted into each of the holes 19. Three holes 19 are provided in the odd-side current collecting contact 6C. An input line 11D, an input line 11E, and an input line 11F are inserted through each of the holes 19. Two holes 19 are provided in the even-side current collecting contact 6D. An input line 11E and an input line 11F are inserted into each of the holes 19. One hole 19 is provided in the odd-side current collecting contact 6E. The input line 11 </ b> F is inserted through the hole 19. The hole 19 is not provided in the even-side current collecting contact 6F.

  However, the shape of the even current collecting contact 6B may be the same as the shape of the odd current collecting contact 6A. In other words, the shape of all the current collecting contacts 6 may be unified to the shape of the odd-numbered current collecting contacts 6A. In this case, all the current collecting contacts 6 are provided with five holes 19. Therefore, when the current collecting contact 6 is assembled, the current collecting contact 6 can be assembled regardless of the correspondence relationship of the current collecting contacts 6, so that the assembling work can be facilitated.

  As shown in FIGS. 2 and 3, the current collecting contact 6 and the insulating shaft 4 are connected by inserting a connecting pin 18 through the current collecting contact 6 and the insulating shaft 4 in the radial direction of the insulating shaft 4. . Therefore, the insulating shaft 4 is provided with a pin hole through which the connecting pin 18 is inserted, corresponding to the position where the current collecting contact 6 is attached. The current collecting contact 6 is provided with a pin hole through which the connecting pin 18 is inserted. The dimensions of the connecting pin 18 and the current collecting contact 6 and the pin hole of the insulating shaft 4 are set so as to fit each other. Further, in the present embodiment, the current collecting contact 6 and the insulating shaft 4 are connected by the connecting pin 18, but the current collecting contact 6 does not rotate with respect to the insulating shaft 4 and other current collecting contacts are connected. The current collecting contact 6 and the insulating shaft 4 may be connected by a fixing method capable of ensuring sufficient insulation performance with respect to other potential portions such as the contact 6. For example, you may connect with a volt | bolt and a nut.

  The connecting pin 18 connecting the odd-numbered current collecting contact 6A is referred to as a first connecting pin 18A, and the connecting pin 18 connecting the even-numbered current collecting contact 6B is referred to as a second connecting pin 18B. The first connecting pin 18 </ b> A is attached to the insulating shaft 4 by connecting the odd-numbered current collecting contact 6 </ b> A to the odd-numbered current collecting contact 6 </ b> A and the insulating shaft 4 in the radial direction of the insulating shaft 4. Each of the odd-number side current collecting contact 6A and the insulating shaft 4 has a first pin hole through which the first connecting pin 18A is inserted.

  The second connecting pin 18B is inserted into the even-side current collecting contact 6B and the insulating shaft 4 in the radial direction of the insulating shaft 4, thereby attaching the even-side current collecting contact 6B to the insulating shaft 4. Each of the even-side current collecting contact 6B and the insulating shaft 4 has a second pin hole through which the second connecting pin 18B is inserted.

  By attaching the current collecting contact 6 and the insulating shaft 4 in this way, the current collecting contact 6 can be accurately and easily attached to a predetermined position of the insulating shaft 4. Further, the current collecting contact 6 can be prevented from rotating in the circumferential direction of the insulating shaft 4.

  In the present embodiment, the current collecting contact 6 can be easily and stably attached to the insulating shaft 4 by using the connecting pin 18. Further, the pin hole of the current collecting contact 6 is provided in the protruding portion extending in the longitudinal direction of the insulating shaft 4 at the center of the current collecting contact 6. By doing in this way, compared with the case where the hole for pins is provided in the outermost side surface of the current collection contact 6, the length of the connection pin 18 can be shortened. As a result, the current collecting contact 6 can be easily attached to the insulating shaft 4 and the material cost can be reduced.

  In the present embodiment, since the insulating shaft 4 is made of glass fiber reinforced plastic, the insulating shaft 4 is made lighter and higher in strength.

  FIG. 5 is a cross-sectional view schematically showing the structure of the input line according to the present embodiment. As shown in FIG. 5, the input line 11 has a structure in which a conductive portion 21 made of a conductor is covered with an insulating material. Specifically, the conducting portion 21 was covered with an insulating paper 22 such as crepe paper and an insulating tube 23 made of an insulating resin material. As described above, since the high insulation performance can be obtained by covering the conduction portion 21, the gap between the inner side surface of the hole portion 19 of the current collecting contact 6 and the outer side surface of the input line 11 is ensured while ensuring the insulation distance. The spatial distance can be shortened. As a result, the input line 11 can be disposed along the outer surface of the insulating shaft 4, and the assembled state can be directly confirmed from the outside. The insulating material used for coating is not limited to crepe paper or resin material.

  According to the present embodiment, the input line 11 is arranged along the outer surface of the insulating shaft 4 and connected to the connection terminal 10 of the current collecting contact 6, so that workability is improved as compared with the case where it is arranged inside the insulating cylinder. improves. Also, the assembly state can be easily confirmed directly from the outside.

  By simplifying the mounting structure between the input line 11 and the current collecting contact 6, the number of parts to be connected can be reduced. As a result, the assembling work of the on-load tap changer 1 becomes easy, and the assembling cost of the on-load tap changer 1 can be reduced.

  Note that the tap selector 3 of the on-load tap changer 1 can be used as a non-voltage tap changer without being connected to the switch 2.

  In addition, the said embodiment disclosed this time is an illustration in all the points, Comprising: It does not become a basis of limited interpretation. Therefore, the technical scope of the present invention is not interpreted only by the above-described embodiments, but is defined based on the description of the scope of claims. Further, all modifications within the meaning and scope equivalent to the scope of the claims are included.

  DESCRIPTION OF SYMBOLS 1 Load tap changer, 2 change-over switch, 3 tap selector, 4 insulation shaft, 5 Geneva gear mechanism part, 6 current collection contact, 7 movable contact, 8 movable contact axis, 9 fixed contact, 10 connection terminal, 11 Input line, 12 Upper frame, 13 Lower frame, 14 Switching switch terminal, 15 Sub-switch, 16 Tap lead, 17 Fixed contact shaft, 18 Connecting pin, 19 Hole, 20 Winding, 21 Conducting part, 22 Insulation Paper, 23 insulation tube.

Claims (4)

Tap selection of the load tap changer that connects the selected tap and the change-over switch of the load tap changer by selecting one tap from a plurality of taps drawn from the winding of the transformer A vessel,
An insulating shaft having one end and the other end in the longitudinal direction;
A first current collecting contact attached to the one end side of the insulating shaft and extending in a circumferential direction of the insulating shaft outside the insulating shaft;
A second current collecting contact attached to the other end side of the insulating shaft at a distance from the first current collecting contact in the longitudinal direction and extending in the circumferential direction of the insulating shaft outside the insulating shaft;
A plurality of first fixed contacts that are spaced apart from each other on the same circumference around the first current collecting contact with the insulating axis as a center and are respectively connected to corresponding taps;
A plurality of second fixed contacts that are spaced apart from each other on the same circumference around the second current collecting contact with the insulating axis as a center and are respectively connected to corresponding taps;
The first current collecting contact can be slidably moved on the same circumference around the first current collecting contact with the insulating shaft as a center, and one first selected from the plurality of first fixed contacts can be moved. A first movable contact connecting one fixed contact and the first current collecting contact;
The first current selected from the plurality of second fixed contacts can be moved in sliding contact with the second current collecting contact on the same circumference around the second current collecting contact with the insulating shaft as a center. A second movable contact connecting the two fixed contacts and the second current collecting contact;
A first input line that extends in the longitudinal direction along the outer surface of the insulating shaft and is connected to the first current collecting contact, and is drawn from the one end of the insulating shaft and receives a load current; ,
A second input line that extends in the longitudinal direction along the outer surface of the insulating shaft and is connected to the second current collecting contact, and is drawn from the one end of the insulating shaft and receives a load current; ,
With
The first current collecting contact has a hole corresponding to a position where the second input line extends in the first current collecting contact,
The tap selector of the on-load tap changer, wherein the second input line is disposed at a distance from the first input line in the circumferential direction of the insulating shaft and is inserted into the hole. A first connecting pin for attaching the first current collecting contact to the insulating shaft by being inserted through the first current collecting contact and the insulating shaft in a radial direction of the insulating shaft;
A second connecting pin for attaching the second current collecting contact to the insulating shaft by inserting the second current collecting contact and the insulating shaft in a radial direction of the insulating shaft;
With
Each of the first current collecting contact and the insulating shaft has a first pin hole through which the first connecting pin is inserted,
2. The tap selector of the on-load tap changer according to claim 1, wherein each of the second current collecting contact and the insulating shaft has a second pin hole through which the second connecting pin is inserted.   Each of the first input line and the second input line has an outer surface covered with an insulating material to ensure an insulation distance between the first current collecting contact and the second current collecting contact. The tap selector of the on-load tap changer according to claim 1 or 2.   The tap selector of the on-load tap changer according to any one of claims 1 to 3, wherein a shape of the second current collecting contact is the same as a shape of the first current collecting contact.

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