Support and fastener for polarization resistors of on-load tap changer

Abstract

A support module (10) for polarization resistors of an on-load tap changer comprises:a supporting region (11) for at least one polarization resistor; a first joint region (13); a second joint region (14) which is compatible with the first joint region. A support frame (19) for polarization resistors of an on-load tap changer comprises:two such support modules which are joined by virtue of the second joint region of the first support module bearing at least partially against the first joint region of the second support module. A fastening element (24) for polarization resistors (22) comprises:two electrically conductive accommodating sections (25), which each have an accommodating opening (27) for one of the ends (23) of a polarization resistor (22);an electrically conductive connecting section (26), which connects the two accommodating sections (25) mechanically and electrically to one another;a first piece (28.1), which comprises the first accommodating section (25.1) and an adjoining first part of the connecting section (26); a second piece (28.2), which comprises the second accommodating section (25.2) and an adjoining second part of the connecting section (26); wherein:the first and second parts are in the form of a plug-type connection.

Claims

1. An assembly of polarity resistors of a tap changer, the assembly comprising: two polarity resistors that each have two electrically conductive ends; and a support structure that comprises two support modules each having: a first support region for at least one polarity resistor; a second support region for at least one polarity resistor; a first connecting face; and a second connecting face that fits the first connecting face; wherein: the support modules are joined with the second connecting face of the first support module at least partly bearing against the first connecting face of the second support module; in each support module the connecting faces are on opposite sides of the support module; in each support module the support regions are on opposite sides of the support module; in each support module each support region is between the connecting faces and/or connects together the connecting faces; the first polarity resistor is fastened to the first support region of the first support module; the second polarity resistor is fastened to the second support region of the first support module and/or the second support region of the second support module; the first end of the second polarity resistor lies closer to the second end of the first polarity resistor than to the first end of the first polarity resistor and is connected with this second end; and the second end of the second polarity resistor lies closer to the first end of the first polarity resistor than to the second end of the first polarity resistor.

2. The assembly according to claim 1, wherein: each polarity resistor is fastened by its ends to the support structure.

3. The assembly according to claim 2, comprising: for each polarity resistor, two fasteners each comprising: two electrically conductive sockets each having a seat for an end of one of the polarity resistors; and an electrically conductive connecting section that mechanically and electrically connects the two sockets together; wherein: each support module has two passages that each extend from the first to the second support region and can receive the connecting section of one of the fasteners in such a way that the first socket of the fastener lies in the first support region of the support module and the second socket of the fastener lies in the second support region of the support module.

4. The assembly according to claim 3, wherein: a first and a second fastener are received in the passages of the first support module; a third fastener is received in one of the passages of the second support module; the first polarity resistor is seated by its first end in the first seat of the first fastener and by its second end in the first seat of the second fastener; and the second polarity resistor is seated by its first end in the second seat of the second fastener and by its second end in the second seat of the third fastener.

5. The assembly according to claim 1, wherein: a first and a second fastener are received in the passages of the first support module; a third and a fourth fastener are received in the passages of the second support module; the first polarity resistor is seated by its first end in the first seat of the first fastener and by its second end in the first seat of the second fastener; the second polarity resistor is seated by its first end in the second seat of the third fastener and by its second end in the second seat of the fourth fastener; and the third fastener is connected with the second fastener.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) Embodiments of the invention are explained in more detail in the following by way of example on the basis of the accompanying drawings. However, the individual features evident therefrom are not restricted to the individual embodiments, but can be connected and/or combined with individual features described further above and/or with individual features of other embodiments. The details in the drawings are to be understood as merely explanatory, but not as limiting. In the drawings:

(2) FIGS. 1A and 1B are side and perspective views of an embodiment of a support module for polarity resistors of a tap changer;

(3) FIGS. 2A and 2b are side and perspective views of an embodiment of a support structure for polarity resistors of a tap changer;

(4) FIGS. 3A and 3B are side and perspective views of a first embodiment of an assembly of polarity resistors of a tap changer;

(5) FIGS. 4A and 4b are sectional and exploded perspective views of an embodiment of a fastener for polarity resistors; and

(6) FIG. 5 is a perspective view of a second embodiment of an assembly of polarity resistors of a tap changer.

SPECIFIC DESCRIPTION OF THE INVENTION

(7) An embodiment of a support module 10 for polarity resistors (FIGS. 3A and 3B), which are not illustrated, of a tap changer (not illustrated) is schematically depicted in FIGS. 1A and 1B. The support module 10 has a first support region 11 and second support region 12 each for at least one polarity resistor and a first connecting face 13 and second connecting face 14. The second connecting face 14 fits and/or is adapted to the first connecting face 13. This support module 10 comprises a unitary base body of injection-molded polyethylene (PE), at which the different regions 11 to 16 are formed.

(8) In this embodiment the first connecting face 13 and second connecting face 14 are on opposite sides of the support module 10, namely at the bottom and top in FIGS. 1A and 1B, and the first support region 11 and second support region 12 are on other, opposite sides of the support module 10, namely at the front and back in FIGS. 1A and 1B. The support regions 11, 12 are thus arranged between the connecting faces 13, 14 and connect these together.

(9) In this embodiment the connecting faces 13, 14 are formed as a tongue-and-groove joint in that the first connecting face 13 has at each of its ends at the left and right in FIGS. 1A and 1B two downwardly projecting right-angled legs 15 that bound therebetween a groove for the tongue-and-groove joint, and the second connecting face 14 has at each of its ends on the left and right in FIGS. 1A and 1B a respective upwardly protruding right-angled leg 16, which legs each form a respective key for the tongue-and-groove joint. The legs 15, 16 each have a passage 17 for reception of a locking element (FIGS. 2A and 2B), which is not illustrated, the passage 17 in FIGS. 1A and 1B extending from the front to the rear.

(10) In this embodiment the base body has at each of its ends on the left and right in FIGS. 1A and 1B two passages 18 for reception of a fastener (FIGS. 3, 4), which is not illustrated, for polarity resistors. Each passage 18 extends from the first to the second support region 11, 12. In addition, the body has between its ends on the left and right in FIGS. 1A and 1B three passages 18 for reception of a polarity contact (FIG. 5), which is not illustrated, or other components. Each passage 18 extends from the first to the second support region 11, 12.

(11) One embodiment of a support structure 19 for polarity resistors (FIGS. 3A and 3B), which are not illustrated, of a tap changer (not illustrated) is schematically illustrated in FIGS. 2A and 2B. The support structure 19 comprises three support modules 10.1, 10.2, 10.3 that in this embodiment are constructed like the support modules 10 according to the first embodiment.

(12) The support modules 10.1, 10.2, 10.3 are joined with the second connecting face 14 of the first support module 10.1 at least partly bears against the first connecting face 13 of the second support module 10.2, namely in the region of the keys or legs 16 of the first support module 10.1 and in the region of the grooves between the legs 15 of the second support module 10.2, and in that the second connecting face 14 of the second support module 10.2 at least partly bears against the first connecting face 13 of the third support module 10.3, namely in the region of the keys or legs 16 of the second support module 10.2 and in the region of the grooves between the legs 15 of the third support module 10.3. When the support modules 10.1, 10.2, 10.3 are correctly joined or assembled, then the passages 17 are aligned in the respectively associated legs 15, 16 and a respective locking element 20 can be pressed into the aligned passages 17.

(13) In this embodiment each [passage 17] is constructed as a grooved pin and consists of injection-molded PE. It is seated with a press fit in the associated aligned passages 17 and thus engages the two adjacent joined support modules 10.1 and 10.2 or 10.2 and 10.3 in such a way that it prevents detaching of these support modules.

(14) A first embodiment of an assembly 21 of polarity resistors 22 of a tap changer (not illustrated) is schematically illustrated in FIGS. 3A and 3B. The assembly 21 is here constructed by way of example as a single-phase assembly 21 and comprises a support structure 19 that in this embodiment is constructed as the support structure 19 in accordance with the second embodiment, four polarity resistors 22.1, 22.2, 22.3, 22.4 that each have two electrically conductive ends 23, and five fasteners 24.1, 24.2, 24.3, 24.4, 24.5. The ends 23 cannot be seen here, since they lie in the interior of the fasteners 24.

(15) In this embodiment the first polarity resistor 22.1 is fastened to the first support region 11 of the first support module 10.1, the second polarity resistor 22.2 is fastened to the second support region 12 of the first support module 10.1 and to the second support region 12 of the second support module 10.2, the third polarity resistor 22.3 is fastened to the first support region 11 of the second support module 10.2 and the fourth polarity resistor 22.4 is fastened to the second support region 12 of the second support module 10.2 and to the second support region 12 of the third support module 10.3.

(16) Each fastener 24 has two electrically conductive sockets 25 that each have a seat for an end 23 of one of the polarity resistors 22, and an electrically conductive connecting section 26 (FIGS. 4A and 4B), which is not illustrated and that mechanically and electrically connects the two sockets 25 together. The connecting section 26 cannot be seen here, since it lies in the passages 18 of the support modules 10. The fasteners 12 are described in more detail further below.

(17) The fasteners 24 are associated with the polarity resistors 22 in pairs, namely the first and second fasteners 24.1, 24.2 with the first polarity resistor 22.1, the second and third fasteners 24.2, 24.3 with the second polarity resistor 22.2, the third and fourth fasteners 24.3, 24.4 with the third polarity resistor 22.3 and the fourth and fifth fasteners 24.4, 24.5 with the fourth polarity resistor 22.4. Thus, two fasteners 24 are provided for each polarity resistor 22.

(18) In this embodiment the first fastener 24.1 is received by its connecting section 26 in the passage 18 of the first support module 10.1 at the lower left in FIGS. 3A and 3B, the second fastener 24.2 is received by its connecting section 26 in the passage 18 of the first support module 10.1 at the upper right in FIGS. 3A and 3B, the third fastener 24.3 is received by its connecting section 26 in the passage 18 of the second support module 10.2 at the lower left in FIGS. 3A and 3B, the fourth fastener 24.4 is received by its connecting section 26 in the passage 18 of the second support module 10.2 at the upper right in FIGS. 3A and 3B and the fifth fastener 24.5 is received by its connecting section 26 in the passage 18 of the third support module 10.3 at the lower left in FIGS. 3A and 3B. Thus, each polarity resistor 22 is fastened by its ends 23 to the support structure 19 in each instance by way of two fasteners 24. Thus, in addition, the first end 23 of the second polarity resistor 22.2 at the right in FIGS. 3A and 3B lies closer to the second end 23 of the first polarity resistor 22.1 at the right in FIGS. 3A and 3B than to the first end 23 of the first polarity resistor 22.1 at the left in FIGS. 3A and 3B and is electrically connected by way of the second fastener 24.2 to this second end 23. Thus, in addition, the second end 23 of the second polarity resistor 22.2 at the left in FIGS. 3A and 3B lies closer to the first end 23 of the first polarity resistor 22.1 than to the second end 23 of the first polarity resistor 22.1. Thus, in addition, the first end 23 of the third polarity resistor 22.3 at the left in FIGS. 3A and 3B lies closer to the second end 23 of the second polarity resistor 22.2 than to the first end 23 of the second polarity resistor 22.2 and is electrically connected by way of the third fastener 24.3 to this second end 23. Thus, in addition, the second end 23 of the third polarity resistor 22.3 at the right in FIGS. 3A and 3B lies closer to the first end 23 of the second polarity resistor 22.2 than to the second end 23 of the second polarity resistor 22.2. Thus, in addition, the first end 23 of the fourth polarity resistor 22.4 at the right in FIGS. 3A and 3B lies closer the second end 23 of the third polarity resistor 22.3 than to the first end 23 of the third polarity resistor 22.3 and is electrically connected by way of the fourth fastener 24.4 to this second end 23. Thus, in addition, the second end 23 of the fourth polarity resistor 22.4 at the left in FIGS. 3A and 3B lies closer to the first end 23 of the third polarity resistor 22.3 than to the second end 23 of the third polarity resistor 22.3. Consequently, the polarity resistors 22 are connected in series and arranged in meandering manner or zigzag form at the support structure 19.

(19) One embodiment of a fastener 24 for polarity resistors 22 (FIGS. 3A and 3B), which are not illustrated and that each have two electrically conductive ends 23, is schematically illustrated in FIGS. 4A and 4B. The fasteners 24 of the assembly 21 of FIGS. 3A and 3B can, for example, be constructed like this embodiment.

(20) The fastener 24 has two electrically conductive sockets 25.1, 25.2 that each have a seat 27 for one of the ends 23 of a polarity resistor 22, an electrically conductive connecting section 26, a first portion 28.1 and a second portion 28.2. The connecting section 26 mechanically and electrically connects together the two sockets 25. The first portion 28.1 includes the first socket 25.1 and a first part 26.1 thereadjacent of the connecting section 26. The second portion 28.2 includes the second socket 25.2 and a second part 26.2 thereadjacent of the connecting section 26.

(21) In this embodiment the free end that is remote from the first socket 25.1 and on the left in FIGS. 4A and 4B, of the first part 26.1 is formed as a cylindrical stud and the free end that is remote from the second socket 25.2 and on the right in FIGS. 4A and 4B, of the second part 26.2 has a cylindrical blind bore 29 for receiving the stud with a clearance fit. The first and second parts 26.1, 26.2 of the connecting section 26 are thus constructed as a plug connection. A respective encircling groove, in which a spring ring is seated when the parts 26.1, 26.2 are correctly plugged together, is formed in the circumferential surface of the stud and in the circumferential wall of the blind bore 29.

(22) In this embodiment the first portion 28.1 comprises a socket body 30.1 that includes the first socket 25.1, and a connecting member 31.1 that includes the first part 26.1 of the connecting section 26. The second portion 28.2 comprises a socket body 30.2 that includes the second socket 25.2, and a connecting member 31.2 that forms the second part 26.2 of the connecting section 26. In each portion 28 the respective socket body 30 has a passage 32 with an internal thread and the free end that is near this socket body 30, of the respective connecting member 31 is formed as a stud with an external thread for engagement in the internal thread. Each connecting member 31.1, 31.2 is thus fastened to the respective socket body 30.1, 30.2 by a screw connection.

(23) In each portion 28 the respective passage 32 opens into the respective seat 27 and is shorter than the stud 33 of the respective connecting member 31. The stud 33 can thereby be screwed to such an extent into the passage 32 that it projects by its free end into the seat 27 and bears against an end 23, which is pushed into the seat 27, of a polarity resistor 22 (FIGS. 3A and 3B), which is not illustrated, so as to firmly clamp this in the socket body 30.

(24) In this embodiment each socket body 30 has two additional passages, in each of which is seated a resilient or elastic thrust member 34 that is biased radially inwardly and bears against an end 23 that is pushed into the seat 27, of a polarity resistor 22 (FIGS. 3A and 3B), which is not illustrated, so as to firmly clamp this in the socket body 30.

(25) A second embodiment of an assembly 21 of polarity resistors 22 of a tap changer (not illustrated) is schematically illustrated in FIG. 5. The assembly 21 is here constructed, by way of example, as a three-phase assembly 21 and has three single-phase assemblies 21, which are in U-shape, a base plate 35, two stabilizing struts 36 and a movable triple-arm polarity contact 37. Each of the single-phase assemblies 21 is constructed in accordance with a third embodiment that is similar to the first embodiment so that in the following merely the differences are described in detail.

(26) Each single-phase assembly 21 comprises a fixed polarity contact 38, a connecting contact 39 and three additional support modules 10.4 that are below the respective first support module 10.1, wherein the uppermost of these additional support modules 10.4 is fastened to the first support module 10.1. The respective lowermost one of these additional support modules 10.4 is fastened to the base plate 35. For that purpose, the base plate 35 has on the one hand, in the region of the assembly 21 on the left and right in FIG. 5, upwardly projecting legs that correspond with the legs 16 of the second connecting faces 14 and are seated in the grooves between the legs 15 of the first connecting face 13 of the respective lowermost one of these additional support modules 10.4. For this purpose the base plate 35 has on the other hand, in the region of the assembly 21 at the rear in FIG. 5, two rearwardly projecting struts that are received in the lower passages 18 of the support regions 11, 12 of the lowermost one these additional support modules 10.4 and are fastened thereto.

(27) In each of the single-phase assemblies 21 the fixed polarity contact 38 is received in one of the passages 18 of the support regions 11, 12 of the respective uppermost one of the additional support modules 10.4 and fastened thereto and the connecting contact 39 is fastened, similarly to a socket body 30, on the end of that fastener 24 that holds the second end of the fourth polarity resistor 22.4 at the third support module 10.3. Each fixed polarity contact 38 is electrically connected by way of a line 40 with the first fastener 24.1 and thus with the first end of the respective first polarity resistor 22.1.

(28) The base plate 35 has in the center a passage in which a perpendicular leg of the movable polarity contact 37 is pivotably or rotatably mounted. The movable polarity contact 37 additionally has three horizontal contact fingers that lie at the level of the fixed polarity contacts 38 and that can be brought into contact with the fixed polarity contacts 38 by pivoting or rotation of the movable polarity contact 37.

(29) The stabilizing struts 36 are fastened to the third support modules 10.3 in that similarly to a first connecting face 13 they are fastened by their ends to the legs 16 of the respective third support module 10.3.