On-load tap changer module

Abstract

Described is an on-load tap changer module (1) for an on-load tap changer (9), comprising: - a support (2), - a load transfer switch (20) having a vacuum interrupter (21) and a bridge switch (25), - a selector (10), - a preselector (40), - a drive module (30), wherein: - the load transfer switch (20), the selector (10) and the preselector (40) are actuated centrally by the drive module (30).

Description

[0001] The invention relates to a load tap changer module for load tap changers.

[0002] Load tap changers are known from the prior art and usually consist of a load changer and a selector. The load changer, with its vacuum switching tubes and switching resistors, is arranged in a cylindrical container. The selector is constructed from a plurality of rods arranged in a circle. Contacts are arranged on these rods at different levels, serving as connections for a control winding. Inside the selector, two selector arms are attached to a switching column. These arms make contact with the contacts on the rods. The load changer and selector are connected to each other via a gearbox. The motor drive is located externally on the step-down transformer and is connected to the load tap changer via a linkage. This design requires considerable installation space, is complex, and expensive. German patent application DE 10 2016 117526 B3 discloses a load tap changer module that corresponds to the preamble of claim 1.

[0003] The object of the invention is therefore to create a load tap changer module for load tap changers that is simple and compact in design while still ensuring safe operation.

[0004] This problem is solved with a load tap changer module according to claim 1. The features of the dependent claims constitute advantageous further developments of the invention.

[0005] The invention proposes a load tap changer module for load tap changers, comprising: a carrier, a load switch with a vacuum switching tube and a bridge switch, a selector, a preselector, a drive module, where: the carrier (2) is designed as a plate, 1 the load switch (20), the selector (10) and the preselector (40) are arranged on the carrier (2) and are centrally actuated by the drive module (30) the selector (10), the preselector (40) and the load switch (20) are evenly distributed on the carrier (2) and arranged around the drive module (30).

[0006] Because all components of the load changer, selector, and preselector are mounted on a single carrier, the load tap changer module is exceptionally compact. This also makes a load tap changer with the load tap changer module particularly small, requiring minimal installation space inside a tap transformer. Furthermore, the design of the load tap changer module allows for centralized actuation of all components via a single drive module. This drive module is centrally located between the load changer, selector, and preselector. In other words, the drive module is surrounded by the load changer, selector, and preselector. Despite the central arrangement of the drive module and the compact design, the live components are safely spaced from one another. Moreover, the central actuation by the drive module ensures precise execution of all switching operations.

[0007] The support is manufactured as a plate or a plate-shaped injection-molded part. The support can be made of plastic, glass fiber reinforced plastic, or any other electrically insulating material.

[0008] The load switch can be designed in any way and may, for example, include one or more vacuum switching tubes and one or more bridge switches. The bridge switch can be actuated by a linear or rotary movement.

[0009] The selector can be configured in any way and may, for example, have one or more selector arms. A selector arm can be configured in any way and may, for example, be designed as a Maltese wheel or a gear. Furthermore, the selector has several selector contacts, which may be T-shaped or L-shaped, for example, so that they extend from one side of the carrier to the other side of the carrier and also project to a side wall of the carrier, where they are connected to the winding taps of a standard winding. The first side of the carrier is positioned opposite the second side of the carrier.

[0010] The drive module can be designed in any way and may, for example, consist of a drive shaft and at least one actuating element. The drive shaft and the actuating element can be designed as a single piece or in multiple parts. The actuating element can be designed as a gear, cam profile, partially toothed gear, driver, or dual driver.

[0011] According to another embodiment, several actuating elements can be arranged on or attached to the drive shaft. These multiple actuating elements can be designed as a single piece or in multiple parts. The actuating elements can be connected to each other, for example, by gluing, screwing, or plugging them together.

[0012] Each actuating element can be configured in any way and can directly or indirectly actuate or drive selectors or preselectors, load switches, or parts thereof. Alternatively, one actuating element can actuate multiple elements, such as selectors and preselectors. Furthermore, multiple actuating elements can actuate a selector, in particular a first selector arm and a second selector arm.

[0013] The drive module can be designed in any way and can be positioned centrally in the middle of the support, surrounded by the selector, preselector, and load switch. The drive module can therefore be positioned centrally, i.e., at the geometric center of the support or approximately at the geometric center of the support.

[0014] It may be provided that three load tap changer modules are connected to each other via, for example, rods, several plates or a frame and are operated by means of a motor, thereby forming a load tap changer.

[0015] The load tap changer can be designed in any way required, for example as a resistance high-speed switch or reactor switch.

[0016] The invention and its advantages are described in more detail below with reference to the accompanying drawings. These show: Figure 1: A first side of a load tap changer module; Figure 2: A drive module for the load tap changer module; Figure 3: A second side of the load tap changer module; Figure 4: A detailed view of a preselector; Figure 5: A load tap changer with three load tap changer modules.

[0017] Figure 1Figure 1 shows a load tap changer module 1 according to the invention for a load tap changer 9. The load tap changer module 1 has a carrier 2 made of a plastic, glass fiber reinforced plastic, or another electrically insulating material. This carrier 2 is either milled or injection molded. On a first side 2.1 of the carrier 2, a first selector arm 11 of a selector 10 and a bridge switch 25 of a load tap changer 20 are arranged. The first selector arm 11 is designed as a Maltese wheel. The first selector arm 11 is rotatably mounted and performs a rotational movement about a selector axis 19. Furthermore, the first selector arm 11 carries at least one first sliding contact 12. Selector contacts 18 are arranged circularly around the selector 10, i.e., the first selector arm 11. The selector contacts 18 are designed such that they extend from the first side 2.1 of the carrier 2 to the second side 2.The selector contacts extend from the carrier 2 and are led to a first side wall 5 of the carrier 2. Specifically, the selector contacts 18 are designed in a T-shape or L-shape.

[0018] The bridge switch 25 has a housing with contacts attached to it. Furthermore, the bridge switch 25 has several fixed contacts. The fixed contacts are attached to the carrier 2 and also project from the first side 2.1 of the carrier 2 to the second side 2.2 of the carrier 2. The housing is connected to a gear via a connecting rod. The contacts on the housing of the bridge switch 25 are connected to a load conductor.

[0019] Furthermore, a drive module 30 is arranged on the carrier 2. This module includes, among other things, a drive shaft 31, which is designed as a hollow or solid square shaft made of plastic. The drive shaft 31 also extends from a first side 2.1 of the carrier 2 to a second side 2.2 of the carrier 2. The drive module 30 is essentially located between the selector 10 and the load switch 20. Several actuating elements (32, 34, 35) are arranged on the drive shaft 31, as shown in Figure 2 The figure shows, in particular, a first driver 32, a cam driver 34, and a drive gear 35. The first actuating element, i.e., the first driver 32, actuates the first selector arm 11 of the selector 10. The fourth actuating element, i.e., the drive gear 35, actuates the bridge switch 25 of the load changeover switch 20. The third actuating element, i.e., the cam driver 34, actuates a vacuum switching tube 21 of the load changeover switch 20.

[0020] Figure 3 Figure 2 shows the second side 2.2 of carrier 2. Here, the second selector arm 15 of selector 10 is arranged. The second selector arm 15 is also designed as a Maltese wheel. The second selector arm 15 is rotatably mounted and also performs a rotational movement around the selector axis 19. Furthermore, the second selector arm 15 carries at least one second sliding contact 12. Selector contacts 18 are arranged circularly around selector 10, i.e., the second selector arm 15. The selector contacts 18 are designed such that they extend from the second side 2.2 of carrier 2 to the first side 2.1 of the carrier and are also led to a first side wall 5 of carrier 2. As already described, the selector contacts 18 are T-shaped or L-shaped.

[0021] Furthermore, the vacuum switching tube 21 of the load changeover switch 20 is arranged on the second side 2.2 of the support 2. It is fixed to the support 2 by means of a bearing block, among other things. A switching resistor 4 is arranged on the second side 2.2 of the support 2 and connected to the load tap changer module 1 via a connecting element 3.

[0022] As in Figure 4 As can be seen, a preselector 40 is also arranged on the second side 2.2 of the carrier 2. This has a preselector arm 41, which is also designed as a Maltese wheel. The first preselector arm 41 is rotatably mounted and also performs a rotary movement about the preselector axis 44. In addition, the preselector 40 has a preselector rocker 42, which can switch between two preselector contacts 43 by a pivoting movement.

[0023] Furthermore, another part of the drive module 30 is arranged on the carrier 2. This part has the aforementioned drive shaft 31. The drive module 30 is essentially located between the selector 10, the load switch 20, and the preselector 40. A second actuating element (33), i.e., the second driver 33, is arranged on the drive shaft 31. The second driver 33 has a first driver and a second driver, through which the second selector arm 15 of the selector 10 and the preselector swing arm 42 are actuated via the preselector arm 41 of the preselector 40.

[0024] Figure 5 shows a load tap changer 9 with three load tap changer modules 1, which are actuated by a motor via a common drive module 30 and its drive shaft 31. Reference symbol list

[0025] 1 Load tap changer module 2 Carrier 2.1 First side of 2 2.2 Second side of 2 3 Connecting element 4 Switching resistor 5 First side wall of 3 9 Load tap changer 10 Selector 11 First selector arm 12 First sliding contact 15 Second selector arm 16 Second sliding contact 18 Selector contacts 19 Selector shaft 20 Load tap changer 21 Vacuum switching tube 25 Bridge switch 30 Drive module 31 Drive shaft 32 First driver / first actuating element 33 Second driver / second actuating element 34 Cam driver for vacuum switching tube / third actuating element 35 Drive gear for bridge switch / fourth actuating element 40 Preselector 41 Preselector arm 42 Preselector swing arm 43 Preselector contact 44 Preselector shaft

Claims

1. An on-load tap-changer module (1) for an on-load tap-changer (9), comprising: - a carrier (2), - a diverter switch (20) with a vacuum interrupter (21) and a bridge switch (25), - a selector (10), - a change-over selector (40), - a drive module (30), wherein: - the carrier (2) is designed as a plate, - The diverter switch (20), the selector (10), and the change-over selector (40) are arranged on the carrier (2), characterized in that - the selector (10), the change-over selector (40), and the diverter switch (20) are evenly distributed on the carrier (2), arranged around the drive module (30), and are actuated centrally by the drive module (30).

2. Load tap changer module (1) according to claim 1, wherein - the drive module (30) comprises a drive shaft (31) with at least one actuating element (32, 33, 34, 35).

3. A load tap changer module (1) according to one of claims 1-2, wherein - the drive module (30) comprises four actuating elements (32, 33, 34, 35), - a first actuating element (32) actuates a first selector arm (11) of the selector (10), - a second actuating element (33) actuates a second selector arm (15) of the selector (10), - a third actuating element (34) actuates a vacuum interrupter (21) of the diverter switch (20), - a fourth actuating element (35) actuates a bridge switch (25) of the diverter switch (20).

4. Load tap changer module (1) according to claim 3, wherein - the second actuating element (32) actuates the change-over selector (40).

5. A load tap changer module (1) according to any one of claims 2-4, wherein - the actuating elements (32, 33, 34, 35) are designed as a single piece or as multiple pieces. - 6. Load tap changer module (1) according to any one of claims 1-5, wherein - the selector (10) has multiple selector contacts (18), - the selector contacts (18) are T-shaped or L-shaped; - the selector contacts (18) are arranged in a circular pattern and extend from a first side (2.1) of the carrier (2) to a second side (2.2) of the carrier (2), - the selector contacts (18) are routed to a first side wall (5) of the carrier (2).

7. A load tap changer module (1) according to any one of claims 1-6, wherein - the carrier (2) comprises a connecting element (3) for a transition resistance (4) or an inductor.

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