EP2989646B1 - Transformateur de réseau local réglable - Google Patents

Transformateur de réseau local réglable Download PDF

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Publication number
EP2989646B1
EP2989646B1 EP14731577.4A EP14731577A EP2989646B1 EP 2989646 B1 EP2989646 B1 EP 2989646B1 EP 14731577 A EP14731577 A EP 14731577A EP 2989646 B1 EP2989646 B1 EP 2989646B1
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EP
European Patent Office
Prior art keywords
local network
network transformer
taps
transformer
contactor
Prior art date
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Application number
EP14731577.4A
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German (de)
English (en)
Other versions
EP2989646A1 (fr
Inventor
Zsolt SUKOSD
Gerd Griepentrog
Karsten Handt
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
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Siemens AG
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Publication of EP2989646A1 publication Critical patent/EP2989646A1/fr
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Classifications

    • 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

Definitions

  • the invention relates to a controllable local network transformer for transforming a medium voltage, typically in the kV range, into a local network voltage, for example 400 V.
  • Energy distribution networks are subject to voltage fluctuations, in particular due to the impedances of the network components and changing loads. It is desirable to keep the fluctuations as low as possible.
  • Switching of the turns ratio is used for transformers between high and medium voltage. This compensates for the voltage fluctuations that occur when the load changes by changing the transmission ratio between the high and medium voltage.
  • at least one of the windings of the transformer is provided with a series of taps that can be connected electrically.
  • a mechanism is provided that switches between two selector positions without interruption even under load. A short circuit is avoided by briefly forcing the current flow through resistors.
  • a bypass for the current is provided via a thyristor circuit.
  • the thyristor circuit and thus the secondary path is switched to conductive when the actual line switch interrupts the current path.
  • Precise control of the thyristor circuit minimizes the time in which a circulating current driven through the windings can flow through the taps, the thyristor circuit and the line switch.
  • the disadvantage of this is the high outlay required for controlling the thyristors very precisely in terms of time.
  • Out CN202068191 U A controllable local network transformer is known which has a contactor on each winding tap, to which a parallel bypass with a series connection of a bypass contactor and one are arranged.
  • the object of the present invention is to provide a controllable local network transformer which is of particularly simple construction. This object is achieved by a controllable local network transformer with the features of claim 1. Advantageous refinements and developments are specified in the dependent claims.
  • the contactors in the connecting lines thus allow a selection of the transformation ratio of the local network transformer by making a direct connection between the first output connection and different taps of the winding.
  • the second tap of the low-voltage transformer winding is also connected to the first output terminal of the local network transformer via a secondary path contactor.
  • the controllable local network transformer thus created has the advantage of a simplified construction compared to known local network transformers. For example, when using a thyristor switching element in the bypass, a control for the thyristors is expedient, which operates with a temporal resolution in the range of 10-100 ⁇ s.
  • the bypass contactor on the other hand, only needs a control accuracy in the range of 10 - 20 ms.
  • the local network transformer comprises a current-limiting element in the bypass, which can be implemented, for example, as a resistor or inductor.
  • the bypass contactor is one of the use categories AC3 or AC4. Because of the short time that the bypass contactor remains switched on, it is possible to use a contactor with a load rating that is lower than the nominal current in the local network transformer. Such a contactor is relatively small and thus significantly reduces the installation space that is required in the local network transformer.
  • the second tap is one of the first taps. In other words, the bypass on one of the first taps.
  • the local network transformer preferably comprises three taps, of which the middle one - in relation to its position on the winding - is connected to the bypass contactor. Alternatively, a different number of taps can also be provided, for example five taps or seven taps.
  • the bypass contactor is preferably connected to the middle of the taps.
  • the local network transformer expediently, but not necessarily, contains a control device which automatically controls the load switchover.
  • the control device expediently has means which make it possible to recognize when a switchover should take place.
  • this can be a means for determining voltage and / or current on the input or output side. This determines whether a switchover is necessary, for example by detecting the corresponding slight reduction in the output voltage when there is an increased load on the output side.
  • the load switchover can also be controlled from outside the local network transformer.
  • the local network transformer expediently has means which enable external control.
  • This can be an indirect, for example digital, remote control, which is converted in the local network transformer by a control device into the actual activation of the switch. It can also be a direct, analog control from the outside, which can possibly even take place without an internal control device, for example by directly applying current to an actuator of the switching element from the outside.
  • FIG. 1 a line switch in a controllable local network transformer 10, which is shown in one phase for a better overview.
  • the local network transformer 10 has a primary winding 100 and a low-voltage secondary winding 101.
  • the voltage on the primary winding 100 side is 10 kV, for example, while a voltage of 400 V AC is output on the secondary winding 101 side.
  • a first output connection 19 of the local network transformer 10 is connected to the taps 13, 14, 15 in a more complex manner in order to implement a switchover of the transmission ratio in the local network transformer 10.
  • a second output connection 12 of the local network transformer 10 is connected to the start 11 of the secondary winding 101.
  • the secondary winding 101 has a first tap 13 at 9/11, a second tap 14 at 10/11 and a third tap 15 at 11/11 of its length; the latter at the end of the secondary winding 101. With this position of the taps 13, 14, 15, the length of the secondary winding 101 used can be increased or decreased by 10% if one starts from the middle of the three taps 14.
  • contactors 16a, b, c are provided, the output connections of which are connected to the first output connection 19.
  • the contactors 16a, b, c establish a connection between the first output connection 19 and the first, second or third tap 13, 14, 15.
  • only one of the contactors 16a, b, c is closed at a time and the remaining contactors are open.
  • the second tap 14 has a further connection to the first output connection 19 parallel to the second contactor 16b via a bypass contactor 17. This connection serves to enable an uninterrupted switchover in which the current is briefly conducted via the bypass contactor 17.
  • a current-limiting resistor 20 is arranged in series with the bypass contactor 17.
  • the bypass contactor 17 In normal operation, the bypass contactor 17 is open, while a connection to one of the taps 13, 14, 15 is established via one of the contactors 16a, b, c. If a switchover is to take place, the bypass contactor 17 is closed in order to keep the current flow uninterrupted. After a short waiting time, for example stored in a controller, the currently closed contactor 16a, b, c is opened and another of the contactors 16a, b, c is closed, i.e. the connection to the currently active tap 13, 14, 15 is interrupted and then the connection to another of the taps 13, 14, 15 is established. The bypass contactor 17 is then opened again.
  • a short waiting time is expediently observed between the beginning of the individual switching operations, for example in the size of the average switching times of the contactors 16a, b, c. This prevents accidental short circuits.
  • a signal from the actuation coils can also be evaluated in order to determine a suitable switching time.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Electrical Variables (AREA)

Claims (4)

  1. Transformateur (10) de réseau local réglable, comportant :
    - un enroulement (101) de transformateur du côté de la tension de réseau local, une partie d'extrémité de l'enroulement (101) du transformateur ayant au moins deux premières prises (13, 14, 15) et l'autre extrémité de l'enroulement (101) du transformateur étant reliée à une deuxième borne (12) de sortie pour la tension de réseau local,
    - une ligne de liaison entre chacune des prises (13, 14, 15) et une première borne (19) de sortie pour la tension de réseau local, un contacteur (16a, b, c) étant monté dans chacune des lignes de liaison,
    - exactement une deuxième prise (14) dans la partie d'extrémité de l'enroulement (101) du transformateur, qui est reliée à la première borne (19) de sortie par exactement un contacteur (17) de circuit parallèle,
    - un élément (20) de limitation du courant en série avec le contacteur (17) de circuit parallèle,
    le contacteur (17) de circuit parallèle étant un contacteur de la classe AC3 ou AC4.
  2. Transformateur (10) de réseau local réglable suivant la revendication 1, dans lequel la deuxième prise (14) est l'une des premières prises (13, 14, 15).
  3. Transformateur (10) de réseau local réglable suivant l'une des revendications précédentes, dans lequel l'élément (20) de limitation du courant est une résistance (20).
  4. Transformateur (10) de réseau local réglable suivant l'une des revendications précédentes, ayant exactement trois premières prises (14, 14, 15).
EP14731577.4A 2013-06-20 2014-06-12 Transformateur de réseau local réglable Active EP2989646B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013211653.5A DE102013211653A1 (de) 2013-06-20 2013-06-20 Regelbarer Ortsnetztransformator
PCT/EP2014/062185 WO2014202447A1 (fr) 2013-06-20 2014-06-12 Transformateur de réseau régional réglable

Publications (2)

Publication Number Publication Date
EP2989646A1 EP2989646A1 (fr) 2016-03-02
EP2989646B1 true EP2989646B1 (fr) 2020-03-25

Family

ID=50979738

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14731577.4A Active EP2989646B1 (fr) 2013-06-20 2014-06-12 Transformateur de réseau local réglable

Country Status (3)

Country Link
EP (1) EP2989646B1 (fr)
DE (1) DE102013211653A1 (fr)
WO (1) WO2014202447A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19747712C2 (de) * 1997-10-29 2000-09-07 Reinhausen Maschf Scheubeck Anordnung eines Stufenschalters an einem Stufentransformator
AT501582A1 (de) * 2001-11-20 2006-09-15 Va Tech Elin Transformatoren G Verfahren zur regelung der elektrischen spannung in elektrischen versorgungsnetzen sowie einrichtung zur durchführung des verfahrens

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19831121A1 (de) * 1998-07-11 2000-01-13 Helmut Hinzen Mehrstufige Anlaufschaltung mit Anlauftransformator für einen Drehstrom-Kurzschlußläufermotor
DE102008064487A1 (de) 2008-12-22 2010-06-24 Siemens Aktiengesellschaft Mittel-Niederspannungstransformator mit Stufenschaltung
CN202068191U (zh) * 2011-01-19 2011-12-07 西安盟创电器有限公司 村口增压器
DE202014001799U1 (de) * 2014-02-27 2014-03-12 Schaltbau Gmbh Trafostufenschalter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19747712C2 (de) * 1997-10-29 2000-09-07 Reinhausen Maschf Scheubeck Anordnung eines Stufenschalters an einem Stufentransformator
AT501582A1 (de) * 2001-11-20 2006-09-15 Va Tech Elin Transformatoren G Verfahren zur regelung der elektrischen spannung in elektrischen versorgungsnetzen sowie einrichtung zur durchführung des verfahrens

Also Published As

Publication number Publication date
WO2014202447A1 (fr) 2014-12-24
EP2989646A1 (fr) 2016-03-02
DE102013211653A1 (de) 2014-12-24

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