Resistance arrangement for a step switch and step switch

Abstract

A resistor device (10) for a graded switch (1) has at least one resistive element (20) held by at least two resistor holders (30). The resistor device (10) includes: a substrate (11) having at least one opening (12) on which the at least two resistor holders (30) for receiving the resistive element (20) are disposed; and a guide (31) constructed in each resistor holder (30), each guide (31) positioning a first end (201) and a second end (202) of the resistive element (20) about a longitudinal direction (L) between the two resistor holders (30). Here, each contact (24) of the resistive element (20) is electrically connected via a contact (40) of the graded switch (1) when the resistive element (20) is inserted into the resistor holder (30).

Description

Technical Field

[0001] The present invention relates to a resistive device for a graded switch and a graded switch having such a resistive device. Background Technology

[0002] German patent application DE 42 31 353 A1 discloses a graded switch. A current-limiting resistor is connected at one end to one of the tap selectors, and at the other end to the neutral point. The resistor is fixedly and immutably installed.

[0003] German utility model DE 77 07 461 U discloses a load switching resistor. The load switching resistor is made of a circular, elliptical, rectangular, or square resistive material with rounded edges. The resistive material is bent into a resistive helix and floated into a cavity. The bent resistive helix is ​​inserted into a cavity formed by two insulating material rods.

[0004] Tiling switches, especially load tiering switches, are used for uninterrupted switching between transformer winding taps. In known load tiering switches based on the principle of fast resistance switching, the circulating current flowing during the switching process, where the currently connected tier contact and the pre-selected new tier contact are simultaneously in contact, is limited by an ohmic resistor, thereby ensuring uninterrupted change in the transformer's turns ratio. This ohmic resistor must be designed according to the specific circuit topology, particular operating conditions, and load current and tap voltage, i.e., the specific application of the load tiering switch. Here, the voltage appearing between the currently connected tier contact and the pre-selected tier contact of the load tiering switch is called the tap voltage. This resistor design is costly and affects the entire manufacturing process of the tiering switch, especially the assembly process. Because different numbers and sizes of resistors are required depending on the application, the structural construction of the tiering switch may also need to be adapted. This results in a large number of different variations of the tiering switch depending on the specific application. Currently, the tiering switch is assembled by equipping the required switching resistors with resistance values ​​specifically determined for the purpose, and then the assembly is completed. The high number of variations leads to increased costs when assembling graded switches. Summary of the Invention

[0005] Therefore, the object of the present invention is to propose an improved scheme for a resistor device for a graded switch, which can be easily and quickly adapted to different application situations of graded switches and ensure the operational safety of graded switches.

[0006] The objective is achieved by a resistive device for hierarchical switching that includes the features of the present invention.

[0007] The resistive device for a graded switch according to the present invention includes at least one resistive element held by at least two resistive retainers. The resistive retainers are disposed on a substrate having at least one opening, on which at least two resistive retainers are provided for receiving the resistive element. The resistive element can be inserted through the opening into a guide disposed within the resistive retainer. A guide is formed in each resistive retainer. Each guide of the two resistive elements positions a first end and a second end of the resistive element longitudinally between the two resistive retainers. Each contact of the resistive element is electrically connected via the contacts of the graded switch when the resistive element is inserted into the resistive retainer.

[0008] The improved design for a graded switch with a resistive device has the advantage that the resistor can be easily and quickly changed or replaced when changes are needed (e.g., changes in the operating conditions of the graded switch) while still ensuring the operational safety of the graded switch.

[0009] According to one possible embodiment of the resistor device for graded switching, one contact of each resistor element is disposed in the edge region of the first end and the second end of each resistor element.

[0010] According to one possible embodiment of the resistive device for a graded switch, each resistor retainer includes a guide for securing a resistive element. Each guide may be configured as a slit having a closed end and an open end. The slit is at least partially provided with a lateral wall that may extend partially along the slit. The resistive element can be pushed in through the open end of the slit. Here, the resistive device is configured such that, after the graded switch is assembled, the resistive element is secured between the at least two resistor retainers by means of the guides of the resistor retainers.

[0011] According to another possible implementation, the guide includes retaining elements, which can be configured as reversibly and elastically pivotable legs having hooks disposed at their free ends. The hooks secure the resistive element pushed into the guide and hold it in a position between the two resistive retaining elements. The elastically pivotable legs deflect when the resistive element is pushed into the guide and thus also form part of the guide.

[0012] According to one possible embodiment of the present invention, the at least one resistive element includes a resistor support and a current limiting element.

[0013] According to one possible embodiment of the invention, the resistor support may be configured as a plate, and the current-limiting element may be configured as a metal wire wound around the plate. According to another possible embodiment, the resistor support may be configured as a frame, and the current-limiting element may be configured as one or more metal springs tensioned within the frame.

[0014] According to one possible embodiment of the invention, each resistive element may have an edge region on a first end and a second end, said edge region having no current-limiting element. The closed end of the guide defines the terminal position of the resistive element in the resistor holder. Thus, a portion of the edge region of the resistive element correspondingly engages substantially with the slit-like locking of the guide.

[0015] The form-locking engagement essentially means that the edge region of the resistive element is at least partially, i.e., precisely, surrounded by the guide on at least three sides in a form-locking manner. Therefore, the open end of the guide forms an open side through which the resistive element can be inserted into the resistor retainer. When the at least one resistive element is pushed into the guide, the resiliently pivotable leg bends, and when the at least one resistive element reaches its terminal position within the guide, it is locked in the guide.

[0016] According to at least one possible implementation, the latch forms part of a guide for the resistor retainer, such that when the resistor element reaches its terminal position in the guide, the latch at least partially surrounds the resistor element and thereby locks it in the terminal position. The latch can also be easily released from the locked position, allowing the resistor element to be removed and replaced, for example, with another resistor element (of a different specification).

[0017] According to at least one possible embodiment, the resistor retainer and guide are integrally formed and made of insulating material. According to at least one embodiment, the resistor retainer, guide, and retaining element are integrally formed. Preferably, the resistor retainer can be made of plastic using an injection molding process.

[0018] According to at least one possible implementation, the substrate has at least one opening in the region of the at least two resistor holders, the opening being configured such that the at least one resistor element can pass through the opening and be fixed between the at least two resistor holders by means of a guide of the resistor holder.

[0019] This allows for the installation of resistive elements after assembling the graded switch, and the easy adaptation of the graded switch to different applications by replacing the resistive elements. It also ensures the electrical contact of the resistive elements remains open.

[0020] According to one possible implementation, the at least one opening can be configured to be substantially rectangular.

[0021] According to one possible embodiment of the invention, the resistive element may include two contacts made of conductive material, which are conductively connected to a current-limiting element. The contacts of the resistive element are substantially disposed in the edge regions of the first and second ends of each resistive element.

[0022] According to one possible implementation, each contact is configured as a metal plate.

[0023] According to one possible embodiment, the resistive device includes at least two contacts that connect the resistive element to the current-carrying conductor of a graded switch via the at least one contact point. These contacts may be configured as spring contacts. The resistive element is preferably electrically connected to the lead and / or contact and / or switch and / or other current-carrying components of the graded switch via the current-carrying conductor. The contacts may be, for example, selector contacts and corresponding graded contacts, through which the voltage ratio of the transformer winding is preselected or adjusted. The switch may be, for example, a vacuum switch tube and / or other mechanical switching element, through which load switching is performed from the currently connected graded contact to the preselected graded contact. According to at least one embodiment, the contacts are configured as spring contacts, the spring contacts having a defined mechanical prestress such that when the resistive element is positioned in the resistor holder, the spring contacts press against the contacts of the resistor support.

[0024] In another possible implementation, the contact can be integrated into the resistor retainer. The contact may also be part of a guide, for example.

[0025] According to another possible embodiment of the invention, the at least two resistive elements may be arranged substantially parallel to each other and / or stacked vertically between the resistive retainer.

[0026] According to one possible embodiment of the invention, the at least two resistive elements form a resistive module.

[0027] Furthermore, according to this improvement, a graded switch is proposed, which includes a resistive device according to the present invention.

[0028] According to one possible embodiment of the invention, the hierarchical switch includes at least a first substrate and a second substrate, which are held together spatially by at least two resistive holding elements.

[0029] According to one possible embodiment of the invention, the at least two resistor holders may be disposed perpendicular to the at least two substrates.

[0030] According to one possible embodiment of the present invention, the at least two resistor holding elements may be disposed between the at least two substrates.

[0031] According to one possible embodiment of the invention, the two resistor holders may be arranged parallel to each other. Attached Figure Description

[0032] The invention is explained in detail below with reference to the accompanying drawings by means of exemplary embodiments. Identical, functionally identical, or having the same effect components may be provided with the same reference numerals. Identical components or components having the same function may be illustrated only with respect to the drawing in which they first appear. The illustrations are not necessarily repeated in the following drawings. In the figures:

[0033] Figure 1 A partial view of a hierarchical switch with an arrangement of resistive elements is shown.

[0034] Figure 2 A perspective view showing an exemplary embodiment of the resistive device according to the improved scheme;

[0035] Figure 3 A longitudinal sectional view is shown of an exemplary embodiment of a resistor holder for a resistor device according to an improved scheme;

[0036] Figure 4 Show Figure 2 Detailed diagram of the resistor device in the diagram;

[0037] Figure 5 A perspective view showing an exemplary embodiment of the resistive element according to the improved scheme;

[0038] Figure 6 Show Figure 2 A perspective view of the arrangement of resistive elements in the circuit, wherein the resistive elements are in electrical contact with the wires of the graded switch;

[0039] Figure 7 Show Figure 6 Another perspective view of the arrangement of the resistive elements in the structure;

[0040] Figure 8 A perspective view showing another exemplary embodiment of the resistor device according to the improved scheme;

[0041] Figure 9 Show Figure 8 The side view of the longitudinal section of the resistor device in the figure;

[0042] Figure 10 A longitudinal sectional view is shown in an exemplary embodiment of a plurality of resistive elements fixed in a resistor holder according to an improved scheme. Detailed Implementation

[0043] The same reference numerals are used for elements that are identical or have the same function in this invention. Furthermore, for clarity, only the reference numerals necessary for describing the respective figures are shown in the various figures. For clarity, components of the step switch that are not important to the following description of the resistive device are not shown in these figures. The figures only illustrate embodiments of the invention; however, the invention is not limited to the embodiments shown.

[0044] Figure 1 A partial view of a step switch 1 is shown. The step switch 1 includes at least one switching element 2, which is used to switch from one tap (not shown) to the next tap (not shown) of a transformer winding. The switching element 2 is equipped with a resistive element 20, which limits the circulating current flowing during the switching process when the currently connected step contact and the pre-selected new step contact are simultaneously in contact. This ensures uninterrupted change in the transformer's turns ratio. The resistive element 20 is held in two resistive retainers 30 and thus positioned relative to the switching element 2. The resistive element 20 defines a first end 201 and a second end 202, which are held in the two resistive retainers 30. A conductive connection from the switching element 2 to the resistive element 20 is established in the region of the first end 201 and the second end 202 via an electrical contact 40.

[0045] Figure 2 This is a perspective view showing an exemplary embodiment of the resistor device 10 of the graded switch 1. The resistor device 10 includes two resistor holders 30, which are disposed or mounted on a substrate 11. The resistor element 20 is held and fixed at a first end 20 and a second end 202 by the resistor holders 30. The resistor element 20 is positioned in the longitudinal direction L by the resistor holders 30.

[0046] As by Figure 3As can be seen, each resistor holder 30 has a guide 31 that facilitates the insertion of the resistor element 20 and positions the inserted resistor element 20 in its longitudinal direction L between the two resistor holders 30. The guide 31 serves as a holder for the first end 201 and the second end 202 of the resistor element 20. According to this exemplary embodiment, the guide 31 is formed by a slot 32 constructed in the resistor holder 30. The slot 32 is at least partially provided with lateral walls 33 that extend only partially along the entire length of the slot 32. The two lateral walls 33 form lateral boundaries of the resistor element 20 that facilitate pushing the resistor element 20 into the guides 31 of the two resistor holders 30 and prevent the resistor element 20 from moving in its longitudinal direction L during insertion or in the terminal position. The guide 31 also has a closed end 37 and an open end 36. The guide 31 is configured in the resistor element 20 such that the closed end 37 is located in the resistor holder 30 and is spaced apart from the substrate 11 by a distance B. Furthermore, when the resistor holder 30 is mounted on the substrate 11, the guide 31 is inclined at an angle α to the substrate 11. (When the resistor holder 30 is mounted on the substrate 11) The open end 36 of the guide 31 of the resistor holder 30 is positioned opposite the opening 12 in the substrate 11. When the resistor element is inserted into the guide 31 of the resistor holder 30, the resistor holder 30 further includes a retaining element 34 for the resistor element 20. The retaining element 34 is configured as a reversibly and elastically pivotable leg 38, which forms a hook 39H on its free end 39. The pivotable leg 38 of the retaining element 34 further forms part of the guide 31. When the resistive element 20 is inserted into the resistor retainer 30, the resiliently constructed retainer 34 is offset rearward, thereby pushing the resistive element 20 into the guide 31. As the resistive element abuts against the closed end 37 of the guide 31, it reaches one of its terminal positions within the guide 31. If the resistive element 20 reaches this terminal position in the guide 31, the pivotable leg 38 moves to its initial position, and the resilient latch 39H on the free end 39 returns to its initial position, thus locking the resistive element 20 in the guide 31. Thus, the resistive element 20 is substantially operatively associated with the guide 31 and the latch 39H in the regions of the first end 201 and the second end 202, and is therefore secured in the two resistor retainers 30.

[0047] Figure 4 A detailed diagram of a resistive device is shown, the resistive device having a resistive element 20 held by one of the resistive holders 30. (See also:) Figure 3As already mentioned in the description, the resistor element 20 is located in the guide portion 31 of the resistor holder with either a first end 201 or a second end 202. A resilient latch 39H on the free end 39 of the pivotable leg secures the resistor element 20 in the guide portion 31.

[0048] Figure 5 A perspective view showing an exemplary embodiment of a resistive element 20 is provided. The resistive element 20 includes a resistive support 21 and a current-limiting element 22, which, according to this exemplary embodiment, is configured as a metal wire wound around the resistive support 21 and secured to a first end 201 or a second end 202 by means of a clip 25. Furthermore, the resistive element 20 has an edge region 23 at both the first end 201 and the second end 202, the edge region not in contact with the current-limiting element 22 or the metal wire. Each edge region 23 of the resistive support 21 is configured with a contact 24. The contact 24 is made of a conductive material and is configured, for example, as a clip or a small plate. Similarly... Figure 5 Shown together and in Figure 6 and 7 The assembly shows a spring contact 40, which is connected at a first free end 42 to a current-carrying wire 41 of the graded switch 1, and at a second free end 43 pressed against the contact 24 of the resistive element 20 with a defined spring force.

[0049] Figure 6 and Figure 7 Different perspective views show the contact between the resistive element 20 and the current-carrying wire 41 of the graded switch 1. The current-carrying wire 41 of the graded switch 1 is correspondingly connected to the first free end 42 of the spring contact 40. To establish electrical contact, the spring contact 40 presses against the formed contact 24 when the resistive element 20 is inserted through the opening 12 of the substrate 11.

[0050] Figure 8 A perspective view showing another embodiment of the resistor device according to the improved scheme is shown. Figure 9 Show Figure 8 The side view of the longitudinal section of the resistor device. Figure 8 and 9A resistive device is shown in a three-phase graded switch 1. Therefore, a substrate 11 made of insulating material has three openings 12 through which a resistive element 20 can be inserted into the assembled graded switch 1. A second substrate 13 made of insulating material is disposed opposite to substrate 11. A total of six resistor holders 30 are mounted between the two substrates 11 and 13. A resistive element 20 is fixed between each of the two resistor holders 30. The two substrates 11 and 13 are interconnected by the resistor holders 30. Preferably, the resistor holder 30 has pins 35 for this purpose, which can be inserted and riveted into corresponding holes (not shown) provided in the substrates 11 and 13.

[0051] Figure 10 A longitudinal sectional view is shown of an exemplary embodiment of a plurality of resistive elements 20 fixed in a resistor holder 30 according to this improved scheme. A total of three resistive elements 20 are arranged, for example, stacked on the resistor holder 30, or rather, arranged vertically. For this purpose, the resistor holder 30 has three guides 31 and three latches 34 of identical construction.

[0052] The resistor device 10 or the step switch 1 according to this improvement allows for flexible, i.e., application-specific, configuration of the required resistor element 20 in terms of resistance (ohmic resistance). According to this improvement, the resistor element 20 can also be inserted after the complete step switch 1 is assembled and can be easily replaced if needed, for example, when the operating conditions of the step switch 1 change. Thus, the step switch 1 can be configured as a stock item, independent of its intended use. Adaptation to the corresponding application of the step switch 1 can also be completely off-the-shelf, for example, by means of the resistor installed locally by the transformer manufacturer or grid operator.

[0053] It is assumed that the current disclosure and its many accompanying advantages are understood through the above description. Furthermore, it is evident that different changes can be made to the form, construction, and arrangement of the components without departing from the disclosed technical solution or sacrificing all material advantages. The described embodiments are merely illustrative, and such modifications are encompassed by the following claims. Moreover, it is self-evident that the invention is defined by the following claims.

[0054] List of reference numerals

[0055] 1. Hierarchical switch

[0056] 2 Switching elements

[0057] 10. Resistor device

[0058] 11 base plate

[0059] 12 Openings

[0060] 13 substrate

[0061] 20 Resistor element

[0062] 201 First end

[0063] 202 Second end

[0064] 21 Resistor Support

[0065] 22 Current limiting components

[0066] 23 Edge Area

[0067] 24 contacts

[0068] 25 clips

[0069] 30 Resistor Holding Component

[0070] 31. Guide

[0071] 32 gaps

[0072] 33 Lateral walls

[0073] 34 Holding element

[0074] 35 sales

[0075] 36 Open end

[0076] 37. Closed end

[0077] 38 Pivotable outriggers

[0078] 39 Free end

[0079] 39H Hook

[0080] 40 contacts

[0081] 41. Conductor

[0082] 42 First free end

[0083] 43 Second Free End

[0084] B Distance

[0085] L is the longitudinal direction of the resistor element.

[0086] α angle

Claims

1. A resistor device (10) for a graded switch (1), the resistor device (10) comprising at least one resistive element (20), the resistive element being held by at least two resistive holding members (30), characterized in that: It has A substrate (11) having at least one opening (12) on which the at least two resistor holders (30) for receiving a resistor element (20) are provided; A guide (31) is constructed in each resistor holder (30), each guide (31) positioning the first end (201) and the second end (202) of the resistor element (20) between the two resistor holders (30) about the longitudinal direction (L); and Each of the resistive elements (20) has one contact (24), which can be electrically connected through the contact (40) of the step switch (1) when the resistive element (20) is inserted into the resistive retainer (30). in, Each guide (31) is configured as a slit (32) having a closed end (37) and an open end (36), and the slit (32) is at least partially provided with a lateral wall (33) extending partially along the slit (32), through which the resistive element (20) can be pushed in.

2. The resistive device (10) according to claim 1, wherein, One contact (24) of each of the resistor elements (20) is disposed in the edge region (23) of the first end (201) and the second end (202) of each resistor element (20).

3. The resistor device (10) according to claim 1, wherein, The guide (31) includes a retaining element (34) configured as a reversibly and elastically pivotable leg (38) having a hook (39H) disposed on a free end (39) that secures and holds a resistive element (20) pushed into the guide (31) in a position.

4. The resistor device (10) according to claim 3, wherein, The resiliently pivotable leg (38) deflects when the resistive element (20) is pushed into the guide (31).

5. The resistive device (10) according to any one of claims 1 to 4, wherein, The at least one resistive element (20) includes a resistor support (21) that supports the current-limiting element (22).

6. The resistive device according to any one of claims 1 to 4, wherein, Each resistive element (20) has an edge region (23) at a first end (201) and a second end (202), respectively, wherein the edge region has no current-limiting element (22); and The closed end (37) of the guide (31) defines the terminal position of the resistor (20) in the resistor holder (30), such that a portion of the edge region (23) of the resistor (20) engages substantially with the slot (32) of the guide (31) in a locking manner.

7. The resistive device (10) according to any one of claims 1 to 4, wherein, The resistor holding element (30) and the guide element (31) are constructed as a single piece.

8. The resistive device (10) according to any one of claims 1 to 4, wherein, Each contact (24) of the resistive element (30) is made of conductive material and is electrically connected to the current limiting element (22).

9. The resistive device (10) according to claim 1, wherein, The contact (40) is configured as a spring contact with a defined mechanical prestress, such that when the resistive element (20) is positioned in the resistor holder (30), the spring contact (40) presses against the contact (24) of the resistor support (21).

10. A graded switch (1), comprising a resistive device (10) according to any one of claims 1 to 9.

11. The graded switch (1) according to claim 10, wherein, The graded switch (1) includes a first substrate and a second substrate, and the at least two resistor holders (30) are held between the first substrate and the second substrate and positioned relative to each other.

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