EP3365906A1 - Transformateur de réseau de répartition réglable - Google Patents

Transformateur de réseau de répartition réglable

Info

Publication number
EP3365906A1
EP3365906A1 EP16797480.7A EP16797480A EP3365906A1 EP 3365906 A1 EP3365906 A1 EP 3365906A1 EP 16797480 A EP16797480 A EP 16797480A EP 3365906 A1 EP3365906 A1 EP 3365906A1
Authority
EP
European Patent Office
Prior art keywords
switch
power transformer
local power
switching
load tap
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.)
Granted
Application number
EP16797480.7A
Other languages
German (de)
English (en)
Other versions
EP3365906B1 (fr
Inventor
Karsten Handt
Michael Heinz
Sylvio Kosse
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.)
Siemens Energy Global GmbH and Co KG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Publication of EP3365906A1 publication Critical patent/EP3365906A1/fr
Application granted granted Critical
Publication of EP3365906B1 publication Critical patent/EP3365906B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • H01H9/0038—Tap change devices making use of vacuum switches
    • 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
    • H01H9/0011—Voltage selector switches

Definitions

  • the invention relates to an adjustable local network transformer for transforming the electrical voltage from the medium-voltage network to the lower voltage used in the low-voltage network (local area network).
  • Controllable local network transformers can change the transmission ratio between their high-voltage side, ie the mean ⁇ voltage of, for example, 10-20 kV, and its low-voltage side, ie the local network voltage of 400V, for example in Europe. As a result, it is possible to compensate for voltage variations that arise, for example, from the feed-in from decentralized photovoltaic systems.
  • Known adjustable local power transformers have on the high-voltage side to an on-load tap, which includes, for example, a medium voltage vacuum tube per phase and stage of the tap changer, so for example 15 medium voltage vacuum switch for three phases and 5 stages.
  • Medium voltage vacuum switches are disadvantageously complex and therefore expensive and therefore make the design of the on-load tap changer unfavorable.
  • a preferred value for the voltage setting steps of 2.5% can be set.
  • Another solution arranges the on-load tap-changer on the low-voltage side of the controllable local power transformer. In this case, cheaper and simpler low voltage vacuums are used.
  • the minimum setting step depends on the number of turns of the undervoltage coil and is for example 5% for 20 turns. This adjusting step is disadvantageously greater than the preferred setting step of
  • Object of the present invention is to provide a controllable local power transformer, the above-mentioned Disadvantages known controllable local power transformer reduces or avoids.
  • the controllable local power transformer according to the invention comprises at least one high voltage coil on the high voltage side and at least one low voltage coil on the low voltage side.
  • the adjustable local network comprises a first transformer load tap for the lower voltage side, wherein the first load tap changer is designed for switching between at least two different numbers of turns of the low voltage coil and comprises for this purpose at least a second scarf ⁇ ter.
  • the controllable Ortsnetztrans ⁇ formator comprises a second on-load tap changer for the high-voltage side, wherein the second on-load tap changer between at least two different numbers of turns of the high-voltage coil is configured and to at least a second switch comprises.
  • the invention provides a controllable local network transformer which has an on-load tap-changer both on the high-voltage side and on the low-voltage side. Due to the present on the high side load tap advantageously ensures that the voltage level can be switched in relative terms ⁇ fine steps, the voltage side of the undervoltage alone would not be reached. At the same time ver ⁇ remains the largest possible part of the planning effort with the load tap on the low voltage side where the lower voltage and lower demands on the construction of the load tap changer due.
  • the switching accuracy and the construction cost has been found when exactly two levels of turns are available on the high voltage side. These are then preferably such that a change in the number of turns of the high-voltage coil between 1% and 4%, in particular between 2% and 3%, preferably ⁇ 2.5%, is effected during the switchover. These margins are smaller than those he are ⁇ reichbar usually on the low voltage side.
  • the first on-load tap changer can be configured to switch between exactly three different numbers of turns of the low voltage coil. With this configuration, there are six different gear ratios.
  • who but the required ⁇ for the three phases only six switches on the high voltage side, while on the low voltage side for a further 12 switches a switch for a bypass for the switching operation is used for each phase are needed.
  • the first and second switches include vacuum switches or vacuum switches. Expediently, a switch is used per phase and per switchable stage of the on-load tap-changer.
  • the controllable local power transformer may have a bridging circuit for current consumption during the switching, wherein the bridging circuit comprises a further switching device and expediently a current limiting resistor.
  • the controllable local network transformer may comprise a controller which is configured to determine a timing of current zero ⁇ passage for a phase to be switched to open a switch for that phase at a time interval of WE- niger than 2 ms before the current zero crossing, and another Close the switch for this phase at a time interval of less than 2 ms after the current zero crossing.
  • Such a structure makes the bypass circuit unnecessary.
  • a switching arc in the switching-off switch disappears in the current zero crossing. Since the switch to be closed at this time still has no contact, a circle ⁇ current is avoided.
  • the first and / or the second on-load tap changer may comprise exactly one changeover switch per phase and switching stage.
  • a changeover switch is used at the location of every two switches that work as a contact. This makes it possible to compensate for the first and / or second load tap favorably with exactly three way switches ⁇ lead.
  • the first and second on-load tap-changer can be constructed together with exactly six toggle switches, thus achieving four switching stages.
  • Switching stages, 3 shows a controllable local power transformer with four
  • the controllable Ortsnetztransforma ⁇ tor 10 includes a high-voltage side 11 and a Unterspan ⁇ tion side 12.
  • the upper ⁇ voltage side 11 is designed for voltages in the range of 20 kV
  • the low voltage side 12 is designed for voltages of 400V.
  • connection lines 14 on the low voltage side 12 are connected to a controller 15 which also includes voltage monitoring.
  • the controller 15 is connected to a first load tap 16 on the high voltage side 11 and controls the ers ⁇ th load tap changer 16.
  • the controller is further connected to a second load tap changer 17, which is arranged on the low-voltage side 12th
  • the controller 15 monitors the voltage levels on the connection lines 14 to the local area network and controls the on-load tap changers 16, 17 according to their position.
  • FIG. 2 schematically shows the structure of the on-load tap changers 16, 17 for an exemplary controllable local power transformer 20, wherein this controllable local power transformer 20 has six different types Switching stages allowed. 2 shows a phase of the high voltage side 21 of the re ⁇ gelbaren local network transformer 20, a main winding 23 and a control winding 24.
  • One end of the main winding 23 is through vacuum switch 27, 28 with two taps of the regulating winding 24 connected.
  • one of the taps of the vacuum switch 27 can be bridged by a parallel Uberb Wegungsschal ⁇ ter 32, wherein in series with the bypass switch 32, a current limiting resistor 35 is arranged.
  • the taps are arranged so that the changeover causes a change in the number of turns of 2.5% of the total number of turns.
  • the bypass can be used in the switching in a known manner to make a circuit under load while reducing circulating currents.
  • the bridging scarf ⁇ ter 32 is activated to take over the power when the vacuum switch 27, 28, which was closed at the time before switching opens. Only after the opening of this vacuum switch 27, 28 closes the other of the vacuum switch 27, 28 and subsequently the semiconductor switch 32 is turned off again.
  • the controllable Ortsnetztrans ⁇ formator 20 On the low voltage side 22 of the controllable Ortsnetztrans ⁇ formator 20 is an analog structure with vacuum switches 29, 30, 31 for low voltage and a bypass switch 33 and a current limiting resistor 36 is present. On the low voltage side 22, however, three taps and therefore also three vacuum switches 29, 30, 31 are present for each phase. The taps on the low voltage side 22 are arranged so that a switch of the vacuum switches 29, 30, 31 lead to relative changes in the voltage of about + 5% of the total number of turns, so just one turn for a total of 20 turns. A smaller step is thus not easily carried out on the low voltage side 22.
  • the two load tap changer can thus drive together six different voltage levels in 2.5% - between, say, -7.5% and + 5% of the standard voltage ⁇ are steps.
  • Six medium-voltage vacuum switches and twelve low-voltage vacuum switches are used for this purpose, while in a known controllable local power transformer, five switching stages are operated exclusively on the upper chip. switchable side, 15 medium voltage vacuum switches are needed.
  • the controller 15 is configured to perform a detection of the current zero crossing and to align the switching operation for the vacuum switch 27 ... 31 thereto.
  • the respective opening vacuum switch 27 ... 31 then opens shortly before a current zero crossing, for example within 2 ms before.
  • the closing vacuum switch 27 ... 31 closes shortly after the current zero crossing, for example within 2 ms thereafter. Since at no time both switches are closed, a circular current is avoided and at the same time switching under load is achieved. As a result, a bypass switch is saved per phase and page 21, 22.
  • switches which either have a very short switching delay, ideally in the range of less than 10 ms, more preferably in the range of less than 2 ms.
  • the switching delay of the switches only slightly depends on ambient conditions such as the temperature. With such switches, it is possible to synchronize the switching time suffi ⁇ accordingly with the current zero crossing.
  • controllable local power transformer 40 has analog trunk windings 43, 45 and control windings 44, 46 for the upper and lower voltage side 41, 42.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electrical Variables (AREA)
  • Housings And Mounting Of Transformers (AREA)

Abstract

L'invention concerne un transformateur de réseau de répartition réglable, pourvu d'au moins une bobine de haute tension du côté de la haute tension et d'au moins une bobine de basse tension du côté de la basse tension, comprenant un premier commutateur de niveau de charge pour le côté de la basse tension. Le premier commutateur de niveau de charge est conçu pour une permutation entre au moins deux nombres de spires différents de la bobine de basse tension et comporte à cet effet au moins un deuxième commutateur. L'objet de l'invention comprend en outre un second commutateur de niveau de charge pour le côté de la haute tension. Le second commutateur de niveau de charge est conçu pour une permutation entre au moins deux nombres de spires différents de la bobine de haute tension et comporte à cet effet au moins un deuxième commutateur.
EP16797480.7A 2015-12-15 2016-11-07 Transformateur de réseau de répartition réglable Active EP3365906B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015225314.7A DE102015225314A1 (de) 2015-12-15 2015-12-15 Regelbarer Ortsnetztransformator
PCT/EP2016/076808 WO2017102174A1 (fr) 2015-12-15 2016-11-07 Transformateur de réseau de répartition réglable

Publications (2)

Publication Number Publication Date
EP3365906A1 true EP3365906A1 (fr) 2018-08-29
EP3365906B1 EP3365906B1 (fr) 2022-01-05

Family

ID=57326356

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16797480.7A Active EP3365906B1 (fr) 2015-12-15 2016-11-07 Transformateur de réseau de répartition réglable

Country Status (3)

Country Link
EP (1) EP3365906B1 (fr)
DE (1) DE102015225314A1 (fr)
WO (1) WO2017102174A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3742251A1 (fr) * 2019-05-24 2020-11-25 Siemens Gamesa Renewable Energy Innovation & Technology, S.L. Commande de transformateur d'éolienne
DE102021113821A1 (de) * 2021-05-28 2022-12-01 Maschinenfabrik Reinhausen Gmbh Verfahren und system zum betrieb eines regeltransformators
DE102022117587A1 (de) 2022-07-14 2024-01-25 Maschinenfabrik Reinhausen Gmbh Verfahren zur Betätigung eines Laststufenschalters sowie Laststufenschaltervorrichtung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1110314A (en) * 1964-08-31 1968-04-18 Ass Elect Ind Improvements in and relating to on-load tap changing gear
JPS5118609B1 (fr) * 1968-03-13 1976-06-11
US3513380A (en) * 1968-06-19 1970-05-19 Westinghouse Electric Corp Load tap changing transformer arrangement with constant impedance
DE19743864C1 (de) * 1997-10-04 1999-04-15 Reinhausen Maschf Scheubeck Stufenschalter
EP2166637A1 (fr) * 2008-09-19 2010-03-24 Siemens Aktiengesellschaft Agencement d'alimentation électrique pour le chauffage électrique direct d'un système de pipeline
DE102011108255A1 (de) * 2011-07-22 2013-01-24 ct.e Controltechnology Engineering GmbH Verfahren zur adaptiven Regelung der Versorgungsspannung in Ortsnetzen
DE102013109289B8 (de) * 2013-08-27 2017-12-28 Maschinenfabrik Reinhausen Gmbh Laststufenschalter, Stufentransformator zur Spannungsregelung und Verfahren zur Durchführung einer Umschaltung im Stufentransformator

Also Published As

Publication number Publication date
WO2017102174A1 (fr) 2017-06-22
DE102015225314A1 (de) 2017-06-22
EP3365906B1 (fr) 2022-01-05

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