US20240006132A1 - Contact unit and contact system for an on-load tap changer and on-load tap changer - Google Patents

Contact unit and contact system for an on-load tap changer and on-load tap changer Download PDF

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Publication number
US20240006132A1
US20240006132A1 US18/032,635 US202218032635A US2024006132A1 US 20240006132 A1 US20240006132 A1 US 20240006132A1 US 202218032635 A US202218032635 A US 202218032635A US 2024006132 A1 US2024006132 A1 US 2024006132A1
Authority
US
United States
Prior art keywords
contact
tap changer
load tap
contact element
connector body
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
Application number
US18/032,635
Other languages
English (en)
Inventor
Borislav Vasilev
Georgi Manev
Todor KOKEV
Angel Mihaylov
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Energy Ltd
Original Assignee
ABB Power Grids Switzerland AG
Hitachi Energy Switzerland AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ABB Power Grids Switzerland AG, Hitachi Energy Switzerland AG filed Critical ABB Power Grids Switzerland AG
Assigned to HITACHI ENERGY SWITZERLAND AG reassignment HITACHI ENERGY SWITZERLAND AG CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: ABB POWER GRIDS SWITZERLAND AG
Assigned to ABB POWER GRIDS SWITZERLAND AG reassignment ABB POWER GRIDS SWITZERLAND AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KOKEV, Todor, MANEV, Georgi, Mihaylov, Angel, VASILEV, Borislav
Publication of US20240006132A1 publication Critical patent/US20240006132A1/en
Pending legal-status Critical Current

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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
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/24—Contacts characterised by the manner in which co-operating contacts engage by abutting with resilient mounting
    • H01H1/30—Contacts characterised by the manner in which co-operating contacts engage by abutting with resilient mounting within supporting guides
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
    • H01H1/44—Contacts characterised by the manner in which co-operating contacts engage by sliding with resilient mounting
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/16—Contacts characterised by the manner in which co-operating contacts engage by abutting by rolling; by wrapping; Roller or ball contacts

Definitions

  • the present disclosure is related to a contact unit and a contact system for an on-load tap changer.
  • the present disclosure is further related to a corresponding on-load tap changer.
  • Tap changers realize a mechanism in transformers which allows for variable turn ratios to be selected in distinct steps, for example.
  • Document CN 2 182 448 Y discloses a rolling contact for the tapping switch of a transformer. An original sliding moving contact is changed into a rolling moving contact. A moving contact, a push rod, a core shaft and a spring are all arranged in a guide limiting groove.
  • the documents WO 2017/036496 A1, EP 0399486 A2, DE 1891475 U, EP 0577963 A1, and US 2003/102205 A1 disclose further switching or contact arrangements for tap changers. In view of movable and stationary electrically engaging contacts it is a challenge to provide a stable and reliable mechanism with low wear and stress.
  • a contact unit for an on-load tap changer comprises a connector body and a contact holder coupled to each other, wherein the connector body is configured to connect the contact holder to a contact of the on-load tap changer.
  • the contact unit further comprises a contact element coupled to the contact holder and configured to make electrical contact to a contact element of a contact device for the on-load tap changer.
  • the contact unit further comprises drive and guiding means coupled to the contact holder such that the contact element is movable driven and linearly guided in a direction away from the connector body.
  • the drive and guiding means comprise at least one linear bearing and an axis arranged inside the bearing which are configured to provide linearly guided movement of the contact element of the contact unit.
  • the contact unit further comprises a further contact holder, a further contact element and further drive and guiding means assembled as the aforementioned ones to enable secure electrical engagement with the contact element of the contact device due to two or more contact element of the contact unit.
  • the contact holders, the contact elements and the corresponding drive and guiding means are coupled to the connector body such that the directions the corresponding contact elements are movable along enclose a predetermined angle.
  • the contact unit may realize a movable contact which is configured to interact with a corresponding stationary contact to provide voltage transfer in a selector of a power diverter switch for an on-load tap changer.
  • the described configuration may enable to provide electrical contact for voltage transfer at an upper and/or a lower position of the corresponding contact element of a contact device.
  • the described contact unit enables to counteract the aforementioned difficulties due to an implementation of a linearly guidance of the contact element, which allows for both the reduction of contact stress via an implementation of interacting contacts as well as for contacts retraction when assembled and engaged to corresponding fixed contacts.
  • the contact element comprises a rotatable roller to make electrical contact to a contact element of a contact device for the on-load tap changer.
  • a rotatable and electrically conductive roller allows for reduced friction and contributes to low wear and stress with respect to engagement with corresponding contact elements of the contact device.
  • the contact element of the contact unit comprises a slider to make electrical contact to a corresponding contact element of a contact device.
  • the drive and guiding means comprise a tensioned or biased spring configured to act as a spring force driving the contact element of the contact unit away from the connector body.
  • a tensioned or biased spring configured to act as a spring force driving the contact element of the contact unit away from the connector body.
  • Such a spring element realizes a simple and low-cost component to reliably provide a force pushing the contact element in the desired direction, towards a corresponding stationary contact element of a contact device, for example.
  • alternative or additional force acting elements may be used as well to act on the contact element of the contact unit.
  • the drive and guiding means comprise at least one linear bearing and an axis arranged inside the bearing which are configured to provide linearly guided movement of the contact element of the contact unit.
  • a spring-loaded and linearly guided contact unit is feasible which causes a relative low friction and thus contributes to low wear and stress while enabling a reliable electrical contact engagement and secure current conduction and/or power transfer.
  • the drive and guiding means comprise two or more linear bearings and corresponding axes arranged inside the associated bearing.
  • the contact element of the contact unit is arranged between the bearings to provide a stable and reliably guided movement of the contact element towards a corresponding contact element of a contact device.
  • a contact system for an on-load tap changer comprises an embodiment of the described contact unit and a contact device with a contact terminal and a contact element configured to provide power supply due to engagement and interaction of the contact elements of the contact unit and the contact device.
  • the contact system comprises an embodiment of the contact unit as described above, features and characteristics of the contact unit are also disclosed with respect to the contact system and vice versa.
  • the contact unit may realize a moving contact arranged at a movable contact element of the contact system whereas the contact device may realize a stationary contact assembled at a predetermined position.
  • the contact unit may realize a positionally fixed contact whereas the contact device may be movably arranged such that an electrical engagement can be set up by movement of the contact device towards the contact unit.
  • the contact unit and the contact device of the contact system are configured to be movable relative to each other.
  • the contact device is configured in coordination with the contact unit to provide low friction and reduced mechanical stresses and to contribute to reliability, ease of assembly and even self-alignment of the interacting contact elements.
  • the contact element of the contact device comprises a curved shape and extends along a ring section. Such a configuration can be beneficial with respect to a movable contact unit moving along a respective a circular path.
  • the contact elements of the contact unit and the contact device comprise a respective contact surface configured to face each other along the direction the contact element of the contact unit is movable.
  • an on-load tap changer for setting a gear ratio comprises a rotatable contact ring, and an embodiment of the aforementioned contact system including the contact unit and the contact device.
  • the contact device is configured stationary and the contact unit is connected to the rotatable contact ring and thus configured movable.
  • the contact element of the contact unit is driven and linearly guided in the direction away from the connector body and towards the stationary contact element of the contact device.
  • the on-load tap changer comprises an embodiment of the contact system as described above, features and characteristics of the contact system and the contact unit as well as the contact device are also disclosed with respect to the on-load tap changer and vice versa.
  • FIG. 1 illustrates an exemplary embodiment of a contact system for an on-load tap changer
  • FIG. 2 illustrates an exemplary embodiment of a contact unit of the contact system
  • FIG. 3 illustrates the contact system of FIG. 1 in a perspective view
  • FIG. 4 illustrates an embodiment of components of the contact unit of the contact system.
  • FIG. 1 illustrates a perspective view of components for an on-load tap changer for a transformer which allows for variable turn ratios to be selected in distinct steps without a supply interruption during a tap change.
  • the on-load tap changer comprises one or more rotatable contact rings 2 movable with respect to a longitudinal axis L configured to enable tap change and power transfer.
  • the on-load tap changer further comprises a plurality of contact units 10 and contact devices 30 configured and arranged in coordination with each other to enable power transfer due to engagement of corresponding electrical contact elements 17 and 31 (see also FIG. 3 ).
  • One contact unit 10 and a corresponding contact device 30 realize a contact system 1 for the on-load tap changer.
  • a respective contact unit 10 arranged to a corresponding contact ring 2 via a contact body 11 of the contact unit 10 .
  • the contact unit 10 Due to its arrangement at the rotatable ring 2 the contact unit 10 realizes a movable contact whereas the contact devices 30 realize stationary contacts fixed in position.
  • the correspondingly arranged contact unit 10 is rotated as well towards one of the contact devices 30 to electrically engage the contact elements 17 and 31 .
  • FIG. 2 shows a perspective view of components of the contact unit 10 and its assembly options.
  • the contact unit 10 comprises the connector body 11 and two contact holders 12 coupled to each other.
  • the connector body 11 is configured to connect the contact holders 12 and to connect the contact unit 10 to the contact ring of the on-load tap changer.
  • the contact unit 10 further comprises two contact elements 17 which are formed as electrical rollers belonging to the respective contact holder 12 .
  • the contact element 17 are coupled to the contact holder 12 fixed but rotatable due to an axis 18 .
  • the contact element 17 of the contact unit 10 is configured to make electrical contact to a corresponding contact element 31 of the contact device 30 which further comprises an electrical contact terminal 32 (see FIG. 3 ).
  • the contact unit 10 further comprises drive and guiding means for each contact holder 12 .
  • the respective drive and guiding means include two linear ball or sliding bearings 15 , two axes 13 and a spring 16 coupled to the contact holder 12 such that the respective contact element 17 is spring-loaded and movable driven and linearly guided in a corresponding direction T 1 or T 2 away from the connector body 11 and towards the contact element 31 of the stationary contact device 30 .
  • the contact body 11 realizes a main block which connects the two roller contact holders 12 by means of the axes 13 and locking elements 14 formed as locking screws, for example.
  • the linear movement of the respective contact holder 12 along its associated direction T 1 or T 2 is provided by the linear ball bearings 15 and retaining motion/force is applied by the inserted spring 16 .
  • the roller contact element 17 comprises a contact surface 171 configured to contact a corresponding contact surface 311 of the contact element 31 of the contact device 30 .
  • the electrical contact between the contact device 30 and a selector contact 21 of the contact unit 10 is provided due to contact of the contacting surfaces 171 , 311 between the fixed contact element 31 and the movable selector contact element 17 .
  • This is achieved via the contact element 17 which is realized as a rotatable roller with respect to the embodiment as illustrated in FIG. 2 .
  • the contact element 17 can be realized as a non-rotatable slider as shown in FIG. 4 .
  • the roller or the slider comprise a curved shape configured in coordination with the curved shape of the contact element 31 of the contact device 30 . This enables a secure and reliable electrical engagement of the contact element 17 and 31 with low friction and low mechanical stress, respectively.
  • the contact element 17 is retained in its place due to the axis 18 .
  • Current is evenly distributed via flexible connections 19 and connection terminals 20 .
  • the contact holders 12 translate via their axes 13 and linear ball bearings 15 and the spring 16 deforms and the entire contact holder 12 retracts. This movement reduces overall wear on the roller or slider contact element 17 , friction is reduced between the fixed contact element 31 and the movable contact element 17 and linear guidance is applied due to the linear ball bearings 15 .
  • the described linearly guided roller/slider contact system 1 realizes a carrier of movable contacts in a selector of the on-load tap changer and allows for a stable and reliable mechanism of electrical engagement and power transfer and contributes to low wear and mechanical stress of the interacting components.
  • the retractability of the contact system 1 enables an easier engagement and self-adjustment during assembly and operation as well.
  • FIGS. 1 to 4 represent exemplary embodiments of an improved contact system 1 for an on-load tap changer; therefore, they do not constitute a complete list of all embodiments according to possible arrangements. Actual arrangements of the contact unit 10 , the contact device 30 and/or the contact system 1 may vary from the embodiments shown in the figures.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Contacts (AREA)
US18/032,635 2021-02-16 2022-01-12 Contact unit and contact system for an on-load tap changer and on-load tap changer Pending US20240006132A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP21157407.4 2021-02-16
EP21157407.4A EP4044206A1 (en) 2021-02-16 2021-02-16 Contact unit and contact system for an on-load tap changer and on-load tap changer
PCT/EP2022/050539 WO2022174993A1 (en) 2021-02-16 2022-01-12 Contact unit and contact system for an on-load tap changer and on-load tap changer

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2022/050539 A-371-Of-International WO2022174993A1 (en) 2021-02-16 2022-01-12 Contact unit and contact system for an on-load tap changer and on-load tap changer

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US18/236,693 Continuation US12020886B2 (en) 2021-02-16 2023-08-22 Contact unit and contact system for an on-load tap changer and on-load tap changer

Publications (1)

Publication Number Publication Date
US20240006132A1 true US20240006132A1 (en) 2024-01-04

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Application Number Title Priority Date Filing Date
US18/032,635 Pending US20240006132A1 (en) 2021-02-16 2022-01-12 Contact unit and contact system for an on-load tap changer and on-load tap changer
US18/236,693 Active US12020886B2 (en) 2021-02-16 2023-08-22 Contact unit and contact system for an on-load tap changer and on-load tap changer

Family Applications After (1)

Application Number Title Priority Date Filing Date
US18/236,693 Active US12020886B2 (en) 2021-02-16 2023-08-22 Contact unit and contact system for an on-load tap changer and on-load tap changer

Country Status (5)

Country Link
US (2) US20240006132A1 (ko)
EP (1) EP4044206A1 (ko)
KR (1) KR102628579B1 (ko)
CN (1) CN116490946B (ko)
WO (1) WO2022174993A1 (ko)

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1891475U (de) * 1964-02-14 1964-04-23 Hugo Miebach G M B H Stufenschalter, insbesondere transformatoren-stufenschalter.
JP2596461B2 (ja) * 1989-05-26 1997-04-02 三菱電機株式会社 ローラコンタクト装置
DE9209212U1 (de) * 1992-07-09 1993-11-04 Pies Gerrit Linearführung
JP2710902B2 (ja) * 1992-09-11 1998-02-10 三菱電機株式会社 ローラーコンタクト装置
CN2182448Y (zh) * 1993-08-29 1994-11-09 刘刚 变压器分接开关滚动式触头
US6331687B1 (en) * 1995-05-15 2001-12-18 Cooper Industries Inc. Control method and device for a switchgear actuator
DE10050821C1 (de) * 2000-10-13 2002-05-02 Reinhausen Maschf Scheubeck Mechanischer Schaltkontakt
DE102007036113B4 (de) * 2007-08-01 2018-05-09 Schaeffler Technologies AG & Co. KG Linearkugellager
DE102011006679B4 (de) * 2011-03-16 2018-07-12 Ferrobotics Compliant Robot Technology Gmbh Aktive Handhabungsvorrichtung und Verfahren für Kontaktaufgaben
CN103563030B (zh) * 2011-03-25 2016-04-20 Abb技术有限公司 具有改进开关结构的分接头变换器
US9351898B2 (en) * 2012-01-18 2016-05-31 The United States of America, as Represnted by the Dept. of Veterans Affairs Vertical lift walker for sit to stand transition assistance
EP2672496A3 (en) * 2012-06-08 2014-01-22 Wuhan Taipu Transformer Changer Co., Ltd. Disk type off-circuit tap changer
DE102013112405A1 (de) * 2013-11-12 2015-05-13 Maschinenfabrik Reinhausen Gmbh Kontakteinheit
KR101538096B1 (ko) * 2014-07-08 2015-07-21 현대중공업 주식회사 탭 절환기
UA124231C2 (uk) * 2015-08-28 2021-08-11 Машіненфабрік Райнхаузен Гмбх Силовий перемикач для силового ступінчастого перемикача, а також основний перемикач тривалого навантаження і роз'єднувач для нього

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Publication number Publication date
WO2022174993A1 (en) 2022-08-25
KR102628579B1 (ko) 2024-01-23
US12020886B2 (en) 2024-06-25
US20230395333A1 (en) 2023-12-07
KR20230091176A (ko) 2023-06-22
EP4044206A1 (en) 2022-08-17
CN116490946B (zh) 2024-03-01
CN116490946A (zh) 2023-07-25

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Owner name: HITACHI ENERGY SWITZERLAND AG, SWITZERLAND

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