EP4252264A1 - On-load tap changer - Google Patents
On-load tap changerInfo
- Publication number
- EP4252264A1 EP4252264A1 EP21807072.0A EP21807072A EP4252264A1 EP 4252264 A1 EP4252264 A1 EP 4252264A1 EP 21807072 A EP21807072 A EP 21807072A EP 4252264 A1 EP4252264 A1 EP 4252264A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plate
- load tap
- tap changer
- drive shaft
- load
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004804 winding Methods 0.000 claims abstract description 26
- 238000007789 sealing Methods 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims 1
- 230000008439 repair process Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 239000004033 plastic Substances 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 5
- 239000012777 electrically insulating material Substances 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 229920001169 thermoplastic Polymers 0.000 description 4
- 239000004416 thermosoftening plastic Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 239000011152 fibreglass Substances 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/0005—Tap change devices
- H01H9/0044—Casings; Mountings; Disposition in transformer housing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/0005—Tap change devices
- H01H9/0038—Tap change devices making use of vacuum switches
Definitions
- the invention relates to an on-load tap changer for uninterrupted switching between winding taps of a tapped transformer.
- On-load tap changers enable the transformation ratio of transformers to be changed under load and are well known from the prior art. They usually have a diverter switch and a selector.
- the diverter switch is equipped with switching means, for example vacuum interrupters, and transition resistors, which are arranged in a cylindrical vessel filled with oil.
- the selector is usually located below the diverter switch vessel and is made up of a plurality of rods arranged in a circle. Contacts are arranged on different levels on these bars, which serve as connections for a control winding. Inside the selector, two selector arms are attached to a switching column. These make contact with the contacts on the rods. Diverter switch and selector are connected to each other via a gear.
- the motor-drive unit is located on the outside of the step-up transformer and is connected to the on-load tap-changer via a linkage.
- the so-called load selector the select and switch functions are combined in one switch. This means that the selector and diverter switch are not spatially separated from each other, but are arranged in a common oil tank.
- the diverter switch or the load selector can be removed from the oil compartment for repair or maintenance work to be carried out. This he follows from above via a cover of the transformer housing.
- the disadvantage of on-load tap-changers with a separate selector is that work on the selector is very difficult because the selector is located below the diverter switch insert and in the transformer oil.
- an on-load tap changer for uninterrupted switching between winding taps of a stepped transformer.
- the on-load tap changer includes a selector unit for power-free preselection to a selected winding tap, a diverter switch unit for the actual load switching from the previous winding tap to the preselected winding tap, and a drive shaft, which is driven by a motor drive and actuates the selector unit and the diverter switch unit.
- the selector unit and the load changeover unit are arranged on a plate.
- the on-load tap changer includes a support structure that includes at least one support rod.
- At least one guide is provided in the edge region of the plate, which is designed to receive the support bar in such a way that the plate can be fixed to the support frame via the at least one guide.
- the plate including the selector and diverter switch unit, which usually include the service and/or repair-relevant components, can be quickly replaced by the support rod being released from the guide by a simple pivoting movement and/or linear movement of the plate and in this way the panel is simply removed from the shoring.
- the plate can be removed, for example, via an opening in a side wall of the transformer housing.
- the plate can be designed in any way, for example as a plate-shaped injection molded part.
- the plate can be made of plastic, for example thermoplastic or glass fiber reinforced plastic, or any other electrically insulating material.
- the diverter switch unit can be designed in any way and, for example, have mechanical and/or power electronic switching means, one or more bridge switches and one or more current-limiting elements.
- the Switching means can be designed, for example, as vacuum interrupters and/or IGBTs and/or thyristors.
- the bridge switch can be actuated by a linear or rotary movement.
- the current-limiting elements can be designed as a resistor and/or as an inductance and/or as a varistor.
- the selector unit can be designed in any way and can have, for example, one or more movable selector contacts.
- a moveable selector contact can be designed in any way, for example as a contact finger that is moved radially.
- the movable selector contacts can also be actuated in any desired manner, for example via a Geneva wheel or a gear wheel.
- Wei terhin has the voter on several fixed contacts that can be connected to the winding taps of the stepped transformer. These can be arranged in any way on the plate, such that they can be contacted by the movable selector contact or multiple movable selector contacts.
- the fixed contacts are arranged radially on the disk.
- the selector unit and the Lastum switch unit are actuated by the drive shaft via a drive unit, which is also arranged on the plate and non-rotatably connected to the drive shaft.
- the drive unit can be designed in any way and consist, for example, of at least one actuating element.
- the drive shaft and the actuating element can be designed in one or more parts.
- the actuating element can be designed as a gear, cam contour, part-toothed gear, driver or double driver.
- a plurality of actuating elements can be arranged on or on the drive shaft.
- the several actuating elements can be configured in one piece or in multiple pieces.
- the actuating elements can, for example, be connected to one another by gluing, screwing or plugging.
- the guide is formed as a U-shaped recess and is designed in such a way that the at least one support rod is at least partially surrounded by the guide in a form-fitting manner.
- the form-fitting surrounding means that the guide surrounds the supporting rod at least on three sides in a form-fitting manner, that is to say with a precise fit.
- the support rod can be pushed into the guide and pulled out via the open side of the guide will.
- the plate is fastened to the at least one support rod in the area of the guide via a snap connection, for example by utilizing the deformation properties of thermoplastics.
- a snap connection for example, cams, beads or hooks can also be provided on the supporting rod, which snap into corresponding undercuts in the guide in a form-fitting manner.
- the support bar can be secured in the guide by means of fixing means, for example pins and/or screws, which extend through the at least one support bar in the area of the guide and into the plate.
- the support framework comprises at least three further support rods and an end plate. A first end of the support rods is attached to the end plate.
- the end plate can be designed in any way.
- the plate can be made of any electrically insulating material, such as plastic, or an electrically conductive material, such as aluminum.
- the support rods can also be made of plastic, for example thermoplastic or glass fiber reinforced plastic, or any other electrically insulating material.
- the end plate has sleeves for fastening the support rods, into which the first end of the support rods is inserted and fixed by means of suitable means.
- suitable means are, for example, bolts and/or screws and/or connecting means with the same effect.
- the sleeves and the plate can be designed in one or more parts.
- the plate has at least three further guides in the edge region, each guide being designed to accommodate one supporting rod.
- a sealing flange is arranged on the end plate, by means of which the supporting structure can be mounted on a housing of the step-up transformer, in particular on a transformer cover.
- the drive shaft extends from a first side of the panel through the panel to a second side of the panel.
- the drive shaft and the plate are arranged perpendicular to each other.
- the drive shaft can be designed in one piece or in several pieces. In the case of a multi-part design, the parts can be connected to one another via couplings.
- the drive shaft and the plate are detachably connected to one another.
- detachable means that the drive shaft can be easily dismantled by being pulled out of the plate and the sealing flange as a whole or in parts, in particular upwards.
- the drive shaft can be connected to the motor drive via the sealing flange.
- the on-load tap changer for a second and third phase of the tapped transformer to be controlled comprises a second and third selector unit, a second and third diverter switch unit, a second plate on which the second selector unit and the second diverter switch unit are arranged, and a third plate on which the third selector unit and the third diverter switch unit are arranged.
- the plates are arranged in a longitudinal direction L of the on-load tap changer along the drive shaft and are held in position by means of the support structure.
- FIG. 1 shows an exemplary embodiment of an on-load tap changer in a schematic representation
- FIG. 2 shows a perspective illustration of an exemplary embodiment of an on-load tap changer according to the improved concept
- FIG. 3 shows a detailed view in a cross-sectional view of an example
- FIG. 4 shows a perspective representation of a further exemplary embodiment of an on-load tap changer according to the improved concept.
- an exemplary embodiment of an on-load tap changer 10 for a tapped transformer 1 is shown schematically.
- the tapped transformer 1 has a main winding 3 and a control winding 4 with different winding taps Ni, ..., Nj, ..., N N , which are switched on and off by the on-load tap changer 10.
- the on-load tap changer includes a selector 30, which can contact the different winding taps Ni, ..., Nj, ..., N N N of the control winding development 4 by means of two movable selector contacts, and a diverter switch 40, which is the actual diverter switch the currently connected leads to the new, preselected winding tap.
- the load changeover switch 40 shown in FIG .
- FIG. 2 shows a perspective representation of an exemplary embodiment of an on-load tap changer according to the improved concept.
- the on-load tap changer 10 has a plate 50, the material made of a plastic, such as glass fiber reinforced plastic, or another electrically insulating material.
- the plate 50 is either designed as a milled part or is produced by means of an injection molding process.
- a selector unit 30, a diverter switch unit 40 and a current-limiting element 41 are arranged on it.
- Powerless fixed contacts 32 of the selector are preselected via the selector unit 30, which in turn are electrically connected to the winding taps of the tapped transformer (not shown).
- the fixed contacts 32 are guided to a side wall 55, through which the selector connections 31 provided for the connection to the winding taps (not shown) of the fixed contacts 32 are passed.
- a drive unit 61 is arranged on the plate 50, essentially between the selector unit 30 and the diverter switch unit 40.
- the drive unit 61 is rotationally connected to a drive shaft 60, which is designed as a hollow or solid square shaft made of plastic.
- the drive shaft 60 extends from a first side 53 of the plate 50 through to a second side 54 of the plate 50 opposite the first side 53 is arranged, and is arranged perpendicular to the plate 50 and detachably connected to this the. Detachable means here specifically that the drive shaft 60 can be pulled out of the plate 50 .
- the drive shaft 60 and thus also the drive unit 61 are driven by a motor drive 70.
- the on-load tap changer 10 also includes a support structure 20 consisting of a total of four support rods 21 and an end plate 23.
- Each support rod 21 is held in a guide 51 in the form of a U-shaped recess provided in the plate 50 and positively connected from three sides this guide 51 surrounded.
- Each guide thus has an open side.
- the side wall 55 is therefore not continuous, but formed in several parts, so that the plate 50 can be easily removed from the support rods 21.
- the plate 50 is secured to the support structure 20 by means of pins (not shown), which extend through the support rods 21 in the area of the guides 51 into the plate 50 .
- pins not shown
- each support rod 21 has a first end 22 fastened to the end plate 23 .
- sleeves 24 are arranged on the end plate 23, into which the ends 22 of the support rods 21 are inserted.
- the supporting framework 20 is mounted on a housing 2 of the stepped transformer 1 by means of a sealing flange 25 which is arranged on the end plate 23 .
- the drive shaft 60 is connected to the motor drive 70 via the sealing flange 25 . If the plate 50 is removed because of service or repair work, the drive shaft 60 must first be pulled out of the plate 50 and through the end plate 23 and the sealing flange 25 .
- FIG. 3 shows a detailed view in a cross-sectional representation of an exemplary embodiment of the on-load tap changer according to the improved concept.
- the first side 53 of the plate 50 is shown in plan view.
- the essential components of the on-load tap changer 10 arranged on the plate 50 have already been explained in the description of FIG. 2, so that they will not be discussed again.
- the guides 51 or the U-shaped Recesses in an edge region 52 of the plate 50 are arranged.
- Three of the U-shaped recesses are formed in such a way that the open side points in the same direction, namely in the direction of the selector terminals 31 .
- One of the guides 51 in this case the guide located in close proximity to the current-limiting element 41, is formed with the open side opposite to the remaining guides.
- the support rod 21 located in this guide must first be removed from the support structure 20 before the plate 50 can be removed from the other three support rods 21, and thus from the support structure 20, by moving it in a transverse direction Q of the on-load tap changer 10. can be removed. The prerequisite for this is that the drive shaft 60 has been removed beforehand.
- FIG. 3 represents only one possible variant for the design of the guides. It is also possible, for example, to design all the guides with the open side pointing in the same direction.
- FIG. 4 shows a perspective representation of a further exemplary embodiment of an on-load tap changer according to the improved concept.
- load step switch 10 from FIG. 4
- the on-load tap changer 10 has a three-phase design and has a second and third plate 50, each of which is designed in accordance with the plate shown in FIGS. 2 and 3.
- the plates 50 are arranged one above the other and spaced apart from one another in a longitudinal direction L of the on-load tap changer 10 along the drive shaft 60 and are held in this position by means of the support framework 20 .
- the drive shaft 60 also extends along the longitudinal direction L of the on-load tap changer 10 and drives all three phases of the on-load tap changer 10 equally.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102020131285.7A DE102020131285A1 (en) | 2020-11-26 | 2020-11-26 | LOAD TAP SWITCH |
PCT/EP2021/080879 WO2022111977A1 (en) | 2020-11-26 | 2021-11-08 | On-load tap changer |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4252264A1 true EP4252264A1 (en) | 2023-10-04 |
Family
ID=78621884
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21807072.0A Pending EP4252264A1 (en) | 2020-11-26 | 2021-11-08 | On-load tap changer |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP4252264A1 (en) |
CN (1) | CN116490948A (en) |
DE (1) | DE102020131285A1 (en) |
WO (1) | WO2022111977A1 (en) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7750257B2 (en) * | 2004-06-03 | 2010-07-06 | Cooper Technologies Company | Molded polymer load tap changer |
EP3086343B1 (en) * | 2015-04-21 | 2018-11-14 | Ormazabal Corporate Technology, A.I.E. | On-load tap changer device |
DE102016104500B3 (en) | 2016-03-11 | 2017-05-04 | Maschinenfabrik Reinhausen Gmbh | OLTC |
CN106601516A (en) * | 2017-02-10 | 2017-04-26 | 山东民生电气设备有限公司 | Miniaturized selection switch assembly used for on-load tap changer |
DE102019131169B3 (en) | 2019-11-19 | 2021-02-18 | Maschinenfabrik Reinhausen Gmbh | On-load tap-changer and tap-changer with on-load tap-changer |
-
2020
- 2020-11-26 DE DE102020131285.7A patent/DE102020131285A1/en active Pending
-
2021
- 2021-11-08 WO PCT/EP2021/080879 patent/WO2022111977A1/en active Application Filing
- 2021-11-08 CN CN202180079186.2A patent/CN116490948A/en active Pending
- 2021-11-08 EP EP21807072.0A patent/EP4252264A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
WO2022111977A1 (en) | 2022-06-02 |
CN116490948A (en) | 2023-07-25 |
DE102020131285A1 (en) | 2022-06-02 |
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