EP3758035B1 - Einphasiger lastumschalter für säulenartigen laststufenschalter - Google Patents

Einphasiger lastumschalter für säulenartigen laststufenschalter Download PDF

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Publication number
EP3758035B1
EP3758035B1 EP19182360.8A EP19182360A EP3758035B1 EP 3758035 B1 EP3758035 B1 EP 3758035B1 EP 19182360 A EP19182360 A EP 19182360A EP 3758035 B1 EP3758035 B1 EP 3758035B1
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EP
European Patent Office
Prior art keywords
interrupter
diverter switch
main
phase
disconnector
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.)
Active
Application number
EP19182360.8A
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English (en)
French (fr)
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EP3758035A1 (de
Inventor
Georgi MANEV
Plamen Danchev MARINOV
Borislav VASILEV
Todor Panteleev Kokev
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Hitachi Energy Ltd
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Hitachi Energy Switzerland AG
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Publication date
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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
    • H01H9/0016—Contact arrangements for tap changers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
    • 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
    • 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
    • H01H9/0027—Operating mechanisms

Definitions

  • the disclosure relates to a single-phase diverter switch for an on-load tap changer of the column type.
  • An on-load tap changer is part of a power transformer and used to switch a tapping of the transformer to regulate an output high voltage when the power transformer is in full operation, i.e. in an on-load condition.
  • the tap changer includes a set of fixed contacts, each fixed contact being connectable to a number of taps of a regulating winding of the power transformer. By selecting the taps to be connected or disconnected as needed, the output voltage of the transformer can be regulated.
  • a tap changer of the diverter type comprises a diverter switch.
  • An electrical connection of a respective fixed contact and an external contact is established by the tap changer through intermediation of the diverter switch.
  • a conventional diverter switch is known in which the current nominally flows through a main branch. In a transition period during switching, the current is made to flow through a transition branch.
  • the transition branch has a higher impedance, such as a higher resistance or a higher inductance.
  • one tap is temporarily connected to the external contact via the transition branch, whereas the other tap is connected via the main branch. Then, the new tap is connected to the external contact via the main branch. Subsequently, the transition branch is disconnected.
  • Such a transition operation requires interrupters for switching from the main branch to the transition branch, and vice versa.
  • vacuum interrupters have a high current carrying capacity and a good switching performance
  • the step voltage to be switched with a vacuum interrupter is typically limited when a compact configuration is desired.
  • an accurate coordination is necessary between a selector unit of the tap changer and the diverter switch.
  • WO 2008/024417 A2 discloses a diverter switch for a tap changer, the diverter switch comprises a main contact, transition contacts, a vacuum switch disposed to quench arcing when switching between the main contacts and the transition contacts.
  • a single-phase diverter switch for a column-type on-load tap changer is provided.
  • the diverter switch comprises the features of appended claim 1.
  • the two main interrupters and the transition phase interrupter are mounted on the first carrier section that takes roughly half the area of a circle.
  • the first and second disconnectors are mounted on the second carrier section.
  • the first and second disconnectors help to realize a higher step voltage for disconnecting the branch that is currently not in use during nominal operation, i.e. either the branch through the first main interrupter or the branch through the second interrupter.
  • the switchable voltage level is raised.
  • any one of the first main interrupter, the second main interrupter and the transition phase interrupter is a vacuum-type, VI, interrupter.
  • VI vacuum-type interrupter.
  • all of the first main interrupter, the second main interrupter and the transition phase interrupter are VI interrupters.
  • first disconnector and the second disconnector each comprise a movable carrying arm and a stationary contact body.
  • the movable carrying arms move relative to the corresponding stationary contact bodies, thus contributing to a safe and simple switching operation.
  • the diverter switch further comprises a central shaft, and the central shaft is configured to drive the first main interrupter, the second main interrupter and the transition phase interrupter.
  • the central shaft is configured to drive the first main interrupter, the second main interrupter and the transition phase interrupter.
  • the central shaft comprises one or more cams.
  • the cams are arranged to act on the first main interrupter, the second main interrupter or the transition phase interrupter, respectively, such that the corresponding interrupter is driven. Acting on the interrupters, as used herein, may include that the cams actually engage with the respective interrupters.
  • the central shaft may comprise one or more actuator pins.
  • the actuator pins are arranged to act on the first or second disconnectors to drive the respective disconnector. Acting on the disconnectors, as used herein, may include that the cams actually engage with the respective disconnectors.
  • one central shaft is configured to drive the first main interrupter, the second main interrupter and the transition phase interrupter, as well as the first disconnector and the second disconnector.
  • the central shaft may comprise - e.g. on or in the vicinity of one end thereof - one or more cams that are arranged such that they act on the first main interrupter, the second main interrupter and the transition phase interrupter to drive the respective interrupter(s); and the central shaft may comprise - e.g. on or in the vicinity of the other end thereof - a plurality of actuator pins that are arranged to act on the first or second disconnectors to drive the respective disconnector(s).
  • the diverter switch is configured to perform a switching according to the switching sequence, wherein the switching sequence comprises, in the stated order, driving an open one of the first and second main interrupters to the closed position, driving the transition phase interrupter to the closed position, driving the respective other one of the first and second main interrupters to the open position, and driving the transition phase interrupter to the open position.
  • the current flows through the first main interrupter.
  • the second main interrupter is driven to the closed position.
  • the transition phase interrupter is driven to the closed position, such that the transition branch participates in the current transmission.
  • the first main interrupter is driven to the open position.
  • the transition phase interrupter is driven to the open position.
  • an exemplary finishing state is established, in which the first main interrupter is open and the second main interrupter is closed.
  • the respective first and second disconnectors may aid in keeping the switchable voltage level high.
  • the switching sequence further comprises driving an open one of the first and second disconnectors to the closed position, and driving the respective other one of the first and second disconnectors to the open position.
  • the first disconnector in which the switching is performed from the exemplary starting state to the exemplary finishing state, the first disconnector is closed and the second disconnector is open in the starting state. In the finishing state, the first disconnector is opened and the second disconnector is closed.
  • an on-load tap changer comprises the single-phase diverter switch as described herein.
  • a power transformer includes an on-load tap changer.
  • the on-load tap changer comprises the single-phase diverter switch as described herein.
  • Fig. 1 shows a schematic perspective view of a diverter switch 100 according to an embodiment.
  • Fig. 2 shows a schematic perspective view of elements (interrupters 110, 111, 112) of the diverter switch 100.
  • Fig. 3 shows a schematic perspective view of the diverter switch 100 and shows, among others, disconnectors 120, 121.
  • Fig. 4 shows a schematic perspective view of the diverter switch 100, and shows, among others, a cam 190, a movable carrying arm 122 on a central shaft 180, and a stationary contact body 123.
  • Fig. 5 shows a schematic perspective view of the diverter switch 100, and shows, among others, the movable carrying arm 122 on the central shaft 180, and the stationary contact body 123.
  • Fig. 6 shows a sectional side view of the diverter switch 100.
  • the diverter switch 100 is adapted to be used with an on-load tap changer of the column type; thus, the diverter switch 100 extends along a rotation axis thereof, roughly from top to bottom in the illustration according to Fig. 1 .
  • a first carrier section 151 of an insulating carrier plate 150 is visible.
  • the first carrier section 151 has a substantially semicircular cross section perpendicular to the rotation axis of the diverter switch 100.
  • An interrupter arrangement formed of a first vacuum-type (VI) main interrupter 110, a second VI main interrupter 111 and a transition phase VI interrupter 112 is disposed, or mounted, on the first carrier section 151.
  • VIP vacuum-type
  • a second carrier section 152 of the insulating carrier plate 150 is visible.
  • a first disconnector 120 is mounted on the second carrier section 152.
  • a second disconnector 121 is mounted on the second carrier section 152 in an area not illustrated here.
  • the first disconnector 120 is electrically connected to the first main interrupter 110, and the second disconnector 121 is electrically connected to the second main interrupter 111, such that both the pair of first disconnector 120 and first main interrupter 110 on the one hand, and the pair of second disconnector 121 and second main interrupter 111 on the other hand participate in a diverter switching operation.
  • the disconnectors 120, 121 are also shown in the illustration of Fig. 3 .
  • the first carrier section 150 is substantially semicircular in cross-section.
  • the second carrier section 151 is substantially semicircular in cross-section.
  • the carrier sections 150, 151 abut on each other, are separate from one another and are arranged substantially in the same plane of the diverter switch 100 perpendicular to the rotation axis.
  • a central shaft 180 penetrates through the diverter switch 100, having mounted thereon multiple actuator pins 170, 171, 172 that are arranged such that upon a rotation of the central shaft 180 and depending on the rotational position thereof, they engage with the disconnectors 120, 121 to drive the respective disconnector 120, 121.
  • the first disconnector 120 comprises a movable carrying arm 122 and a stationary contact body 123.
  • the second disconnector 121 comprises a movable carrying arm 124 and a stationary contact body 125.
  • the movable carrying arms 122, 124 Upon the rotational movement of the central shaft 180, the movable carrying arms 122, 124 perform a pivoting movement to engage, when the rotational angle is correct, with the respective corresponding contact body 123, 125.
  • a cam 190 is mounted on the central shaft 180 that is arranged such that upon rotating the central shaft 180 and depending on the rotational position thereof, the cam 190 acts on the first main interrupter 110, the second main interrupter 111, or the transition phase interrupter 112 respectively, to actuate - or drive - the respective interrupter 110, 111, 112.
  • the diverter switch 100 comprises two main vacuum interrupters 110, 111 and one auxiliary, or transition phase, vacuum interrupter 112 that are mounted on the semicircular half formed by section 151 of the plate 150.
  • the contact disconnectors 120, 121 that are driven by the central shaft 180 via an even number of pins 170, 171, 172 (a fourth one not shown in the drawings) that are fastened on the shaft 180.
  • the interrupters' driving system 115 is mounted on carrying plate 160.
  • the movable part of the contact disconnectors 120, 121 comprises the carrying arms 122, 124.
  • the stationary part of the contact disconnectors 120, 121 comprises the stationary contact bodies 123, 125, e.g. a pair of contact clamps that are gripped by the movable elements on both sides.
  • the diverter switch 100 is configured such that by rotating the central shaft 180, a switching according to a switching sequence is carried out.
  • a switching sequence an open one of the first main interrupter 110 and second main interrupter 111 is driven to the closed position.
  • the transition phase interrupter 112 is driven to the closed position.
  • the respective other one of the first main interrupter 110 and second main interrupter 111 is driven to the open position.
  • the transition phase interrupter 112 is driven to the open position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Claims (9)

  1. Einphasiger Lastumschalter (100) für einen Säulen-Laststufenschalter, der Folgendes umfasst:
    eine isolierende Trägerplatte (150) mit einem ersten Trägerabschnitt (151) und einem zweiten Trägerabschnitt (152),
    wobei der erste Trägerabschnitt (151) und der zweite Trägerabschnitt (152) voneinander getrennt sind und im Wesentlichen in der gleichen Ebene des Lastumschalters (100) senkrecht zu einer Drehachse einer Zentralwelle (108) des Lastumschalters (100) angeordnet sind;
    eine Unterbrecheranordnung, die auf dem ersten Trägerabschnitt (151) der isolierenden Trägerplatte (150) angeordnet ist, wobei die Unterbrecheranordnung einen ersten Hauptunterbrecher (110), einen zweiten Hauptunterbrecher (111) und einen Übergangsphasenunterbrecher (112) umfasst;
    eine Trennschalteranordnung, die auf dem zweiten Trägerabschnitt (152) der isolierenden Trägerplatte (150) angeordnet ist, wobei die Trennschalteranordnung einen ersten Trennschalter (120), der elektrisch mit dem ersten Hauptunterbrecher (110) verbunden ist, und einen zweiten Trennschalter (121), der elektrisch mit dem zweiten Hauptunterbrecher (111) verbunden ist, umfasst,
    wobei an der Zentralwelle (180) mindestens ein Nocken (190) montiert ist, der so angeordnet ist, dass der mindestens eine Nocken (190) bei Drehung einer Zentralwelle (180) und in Abhängigkeit von deren Drehposition auf den ersten Hauptunterbrecher (110), den zweiten Hauptunterbrecher (111) oder den Übergangsphasenunterbrecher (112) einwirkt, so dass jeweilige Schaltzustände der Unterbrecheranordnung und der Trennschalteranordnung nach einer vorgegebenen Schaltfolge steuerbar sind.
  2. Einphasiger Lastumschalter nach einem der vorhergehenden Ansprüche,
    wobei einer oder mehrere des ersten Hauptunterbrechers (110), des zweiten Hauptunterbrechers (111) und des Übergangsphasenunterbrechers (112) ein Vakuum-Unterbrecher (VI) ist.
  3. Einphasiger Lastumschalter nach einem der vorhergehenden Ansprüche,
    wobei der erste Unterbrecher (120) und der zweite Unterbrecher (121) jeweils einen beweglichen Tragarm (122, 124) und einen feststehenden Kontaktkörper (123, 125) aufweisen.
  4. Einphasiger Lastumschalter nach Anspruch 1,
    wobei die Zentralwelle (180) den mindestens einen Nocken (190) umfasst, der so angeordnet ist, dass er auf den ersten Hauptunterbrecher (110), den zweiten Hauptunterbrecher (111) oder den Übergangsphasenunterbrecher (112) einwirkt oder damit in Eingriff kommt, um den jeweiligen Unterbrecher anzutreiben.
  5. Einphasiger Lastumschalter nach einem der Ansprüche 1-2,
    wobei die Zentralwelle (180) eine Vielzahl von Betätigungsstiften (170, 171, 172) umfasst, die so angeordnet sind, dass sie auf den ersten oder zweiten Unterbrecher (120, 121) einwirken oder mit ihm in Eingriff kommen, um den jeweiligen Unterbrecher anzutreiben.
  6. Einphasiger Lastumschalter nach einem der vorhergehenden Ansprüche,
    wobei der einphasige Lastumschalter so konfiguriert ist, dass er einen Schaltvorgang gemäß der Schaltfolge durchführt, wobei die Schaltfolge folgende Aktionen in der angegebenen Reihenfolge umfasst:
    i) Antreiben eines offenen des ersten und zweiten Hauptunterbrechers (110, 111) in die geschlossene Stellung;
    ii) Antreiben des Übergangsphasenunterbrechers (112) in die geschlossene Stellung;
    iii) Antreiben des jeweils anderen des ersten und zweiten Hauptunterbrechers (110, 111) in die offene Stellung;
    iv) Antreiben des Übergangsphasenunterbrechers (112) in die offene Stellung.
  7. Einphasiger Lastumschalter nach Anspruch 6,
    wobei die Schaltfolge ferner das Antreiben eines offenen des ersten und zweiten Trennschalters (120, 121) in die geschlossene Stellung und das Antreiben des jeweils anderen des ersten und zweiten Trennschalters (120, 121) in die offene Stellung umfasst.
  8. Laststufenschalter, der den einphasigen Lastumschalter nach einem der vorhergehenden Ansprüche umfasst.
  9. Leistungstransformator, der einen Laststufenschalter aufweist,
    wobei der Laststufenschalter den einphasigen Lastumschalter nach einem der Ansprüche 1-7 umfasst.
EP19182360.8A 2019-06-25 2019-06-25 Einphasiger lastumschalter für säulenartigen laststufenschalter Active EP3758035B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19182360.8A EP3758035B1 (de) 2019-06-25 2019-06-25 Einphasiger lastumschalter für säulenartigen laststufenschalter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19182360.8A EP3758035B1 (de) 2019-06-25 2019-06-25 Einphasiger lastumschalter für säulenartigen laststufenschalter

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EP3758035A1 EP3758035A1 (de) 2020-12-30
EP3758035B1 true EP3758035B1 (de) 2023-08-02

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230411088A1 (en) * 2021-02-16 2023-12-21 Hitachi Energy Switzerland Ag Switching system for an on-load tap changer, on-load tap changer and method for switching a tap connection of an on-load tap changer
CN114944297A (zh) * 2022-06-14 2022-08-26 常州博瑞电力自动化设备有限公司 一种有载分接开关的分体式切换开关

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2470402C2 (ru) * 2006-08-23 2012-12-20 Абб Текнолоджи Лтд. Вакуумный дивертерный переключатель для переключателя отводов
JP5971674B2 (ja) * 2011-09-20 2016-08-17 株式会社東芝 負荷時タップ切替装置、及びその蓄勢機構

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