EP2831894B1 - Ortsnetz-transformator - Google Patents

Ortsnetz-transformator Download PDF

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Publication number
EP2831894B1
EP2831894B1 EP13720298.2A EP13720298A EP2831894B1 EP 2831894 B1 EP2831894 B1 EP 2831894B1 EP 13720298 A EP13720298 A EP 13720298A EP 2831894 B1 EP2831894 B1 EP 2831894B1
Authority
EP
European Patent Office
Prior art keywords
voltage
transformer
switching devices
local grid
phases
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
EP13720298.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2831894A1 (de
Inventor
Gerd Griepentrog
Karsten Handt
Gyula Hipszki
Ronald Schmid
Zsolt SUKOSD
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 AG
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Siemens AG
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Publication date
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Publication of EP2831894A1 publication Critical patent/EP2831894A1/de
Application granted granted Critical
Publication of EP2831894B1 publication Critical patent/EP2831894B1/de
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil cooling
    • 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
    • H01F29/025—Constructional details of transformers or reactors with tapping on coil or windings
    • 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 local network transformer for transforming a medium voltage in the kV range into a voltage for the local power supply.
  • the DE 20 2010 012 811 U1 and the GB 1007496A show solutions for transformers with tap changers.
  • the equipment of the tap-changer are arranged in the oil-filled boiler.
  • a permanent connection is made by means of a controlled anti-parallel connected thyristor pair. It is an object of the present invention to provide an improved local power transformer, with which the above-mentioned problem is reduced. This object is achieved by a local power transformer with the features of claim 1.
  • the local network transformer according to the invention for the local network power supply has an active part with primary and secondary windings for converting a primary medium voltage into a secondary local network voltage, wherein the active part is arranged in a transformer tank with cooling and insulating liquid. Furthermore, the local network transformer comprises a plurality of switching means for adjusting the ratio between the primary voltage and the secondary voltage, wherein the switching means are connected on the secondary side between taps of the secondary side windings and the neutral point of the secondary side windings. Finally, the switching devices are arranged in the transformer boiler in the area of cooling and insulating liquid.
  • the primary voltage is a medium voltage in the range of a few kV, for example 10 kV, 20 kV or 30 kV.
  • the secondary voltage is a voltage for the local supply of a local network or urban network, for example, 230V single-phase at 400V line-to-line voltage.
  • the switching devices are designed, for example, such that the secondary voltage can be varied in steps by means of a suitable control. Due to the advantageous arrangement of the switching devices in the transformer boiler is achieved that bushings of Anzapfun conditions of the secondary windings out of the transformer box are unnecessary. Furthermore, it is achieved that the copper lines are short from the taps to the switching devices. Finally, it is additionally achieved that cooling of the switching devices automatically takes place, since the switching devices are arranged in the cooling and insulating liquid.
  • the stated construction is modular, i. In addition to a structure with 3 or 5 taps and constructions can be realized with more taps without much additional effort. There are no substantial changes necessary, but it must only be adapted to the number of switching devices and appropriate taps are provided.
  • the switching devices preferably each comprise a parallel circuit comprising a controllable mechanical switch and at least one controllable semiconductor switch. This is at the same time given a lossless power line in the normal state, i. when not currently switching, while at the same time a fast switchable bypass is possible when switching the voltage level. For an interruption-free switching is advantageously possible.
  • the switching devices each comprise a bistable mechanical switch.
  • the controllable mechanical switch is expediently a bistable switch. This ensures that in the switching devices no performance is required, as long as no switching takes place, because on the one hand no holding power for the mechanical switch is necessary, the current flow through the mechanical switch and not about semiconductor and on the other hand, the transformer has a defined switching group even in the de-energized state.
  • the switching devices are arranged in the transformer box below the windings. "Below” refers to the area between the lower edge of the windings and the bottom of the tank.
  • the switching means are in a range of cooling and insulating liquid, which is still relatively cool due to the heat convection. This ensures good cooling of the switching devices.
  • the local network transformer expediently comprises a control device for detecting voltage and / or current of at least one of the phases and for controlling the switching devices on the basis of the detected values.
  • the control is expediently such that a deviation of voltage values occurring in the local network from at least one predefinable setpoint voltage value for the local network is reduced.
  • control device and the transformer are constructed in the immediate vicinity of each other.
  • control device may be an external device separate from the transformer, but which is arranged in the immediate vicinity of the transformer.
  • FIGS. 1 and 2 show sectional views of a local network transformer 10, in the case of FIG. 1 a side view and FIG. 2 a front view.
  • a transformer tank 11 makes the main part of the local network transformer 10.
  • the active part 12 of the local network transformer 10 with windings 311, 312, 313 is housed in about halfway up.
  • copper lines lead to passages through the wall of the transformer tank 11. These passages lead into connecting elements for the phases of the local network and the medium voltage.
  • the switching devices 13 are in that part of the transformer tank 11, which will be the coolest under normal conditions, since the heated in the region of the active part 12 cooling and insulating liquid will strive upward. It is also advantageous that the additional arrangement of the switching devices 13 in the transformer tank 11 additional complex and expensive feedthroughs from the transformer tank 11 are unnecessary.
  • FIG. 3 schematically shows the secondary coils 311, 312, 313. At these taps 32 are arranged to one end of the coil, in the present example exactly five taps 32 per secondary coil 311, 312, 313. The last of the taps 32 is the respective coil end itself.
  • Each of the taps 32 is connected to the input contact 135 of each switching device 13.
  • the output contacts 134 of all switching devices 13 are in turn combined and connected to the neutral terminal 16.
  • Each of the switching devices 13 comprises a parallel connection of a bistable mechanical switch 131 with a series of a resistor 133 and an anti-parallel pair of thyristors 132.
  • the parallel circuit is connected on both sides with the input contact 135 and the output contact 134.
  • FIG. 4 is also apparent that the switching devices 13 have no preferred operating direction and thus can be used with reversed input and output contact 134, 135.
  • the respective control contacts of the individual elements are guided together or separately from one another to a control device 33.
  • FIG. 4 shows the switching device 13 with closed bistable switch 131. This will be the case in normal operation only in three of the switching devices 13, one per phase. In the other switching devices 13 is the bistable Switch open and the thyristor pair 132 inactive and thus no current flow possible. It is particularly advantageous in the present switching device 13 that the bistable switch 131 as well as the other elements in normal operation requires power. Likewise, there is a very low volume resistance, since the current is not passed through semiconductor. Overall, this is - as well as a change in voltage - as little power needed as in a transformer of the prior art without voltage regulation.
  • the control device 33 is configured in this example to receive and evaluate measured values for the voltage. For this purpose, for example, the measured voltages are compared with a nominal voltage value of 230 V or 400 V. If a clear deviation is detected, then a change in the voltage level on one of the phases in the local network is necessary. Then the gear ratio is switched. It is advantageous that this can take place specifically for the phase or phases in which the change is necessary, independently of the other phases.
  • the switchover takes place without interruption, by first making a power line via thyristor pairs 132. The concept of switching is described in the DE 10 2008 064 487 A1 ,

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Electrical Variables (AREA)
EP13720298.2A 2012-05-10 2013-04-23 Ortsnetz-transformator Active EP2831894B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012207800A DE102012207800A1 (de) 2012-05-10 2012-05-10 Ortsnetz-Transformator
PCT/EP2013/058372 WO2013167372A1 (de) 2012-05-10 2013-04-23 Ortsnetz-transformator

Publications (2)

Publication Number Publication Date
EP2831894A1 EP2831894A1 (de) 2015-02-04
EP2831894B1 true EP2831894B1 (de) 2018-12-26

Family

ID=48289086

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13720298.2A Active EP2831894B1 (de) 2012-05-10 2013-04-23 Ortsnetz-transformator

Country Status (4)

Country Link
EP (1) EP2831894B1 (zh)
CN (1) CN104272405A (zh)
DE (1) DE102012207800A1 (zh)
WO (1) WO2013167372A1 (zh)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016203245A1 (de) 2016-02-29 2017-08-31 Siemens Aktiengesellschaft Elektrisches Energiespeichersystem
DE102018203889A1 (de) * 2018-03-14 2019-09-19 Younicos Gmbh Energiespeichersystem und Verfahren zum Steuern eines Energiespeichersystems
WO2021001028A1 (de) * 2019-07-02 2021-01-07 Siemens Energy Global GmbH & Co. KG Anordnung zum anschluss an ein wechselspannung führendes hochspannungsnetz

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1007496A (en) * 1962-11-21 1965-10-13 Electric Construction Co Improvements relating to transformer tap-changing
US3739256A (en) * 1971-01-29 1973-06-12 Reinhausen Geb Scheubeck Kg Ma Transfer switching system for regulating transformers including thyristor network and logic controls therefor
DE19719739A1 (de) * 1997-05-09 1998-11-12 Kaiser Kabel Gmbh Spannungs-Schaltvorrichtung
US6657837B1 (en) * 1999-12-29 2003-12-02 General Electric Company Circuit breaker incorporating fault lockout protection
DE10119664A1 (de) * 2001-04-20 2002-11-14 Reinhausen Maschf Scheubeck Anordnung zur automatischen Spannungsregelung und Motorantrieb zur automatischen Spannungsregelung
DE102007029905B4 (de) * 2007-06-28 2009-07-02 Areva Energietechnik Gmbh Verfahren zum Betreiben eines elektrischen Transformators
CN201170985Y (zh) * 2008-01-10 2008-12-24 北京电研华源电力技术有限公司 一种有载调容配电变压器的复合开关及其配电变压器
CN101430966B (zh) * 2008-08-21 2011-02-16 上海华明电力设备制造有限公司 晶闸管直接切换有载分接开关
CN201259827Y (zh) * 2008-08-21 2009-06-17 上海华明电力设备制造有限公司 晶闸管电抗过渡无快速机构有载分接开关
DE102008064487A1 (de) * 2008-12-22 2010-06-24 Siemens Aktiengesellschaft Mittel-Niederspannungstransformator mit Stufenschaltung
DE202010012811U1 (de) * 2010-09-18 2011-12-19 Maschinenfabrik Reinhausen Gmbh Stufenschalter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
WO2013167372A1 (de) 2013-11-14
EP2831894A1 (de) 2015-02-04
CN104272405A (zh) 2015-01-07
DE102012207800A1 (de) 2013-11-14

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