EP2622614A1 - Device and method for reducing a magnetic unidirectional flux fraction in the core of a transformer - Google Patents
Device and method for reducing a magnetic unidirectional flux fraction in the core of a transformerInfo
- Publication number
- EP2622614A1 EP2622614A1 EP10760331.8A EP10760331A EP2622614A1 EP 2622614 A1 EP2622614 A1 EP 2622614A1 EP 10760331 A EP10760331 A EP 10760331A EP 2622614 A1 EP2622614 A1 EP 2622614A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- current
- switching unit
- compensation winding
- transformer
- core
- 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
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 38
- 230000004907 flux Effects 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims description 22
- 238000004804 winding Methods 0.000 claims abstract description 60
- 230000000694 effects Effects 0.000 claims description 6
- 239000004065 semiconductor Substances 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 230000001960 triggered effect Effects 0.000 claims description 3
- 230000009471 action Effects 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract 2
- 230000008901 benefit Effects 0.000 description 6
- 230000007774 longterm Effects 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 230000002123 temporal effect Effects 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/38—Auxiliary core members; Auxiliary coils or windings
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F7/00—Regulating magnetic variables
-
- 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
- H01F27/33—Arrangements for noise damping
-
- 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
- H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
-
- 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
- H01F29/14—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias
- H01F2029/143—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias with control winding for generating magnetic bias
Definitions
- the invention relates to an apparatus and a method for reducing a magnetic DC component in the core of a transformer, having a measuring device which corresponds to the magnetic DC component
- Sensor signal provides, with a compensation winding which is magnetically coupled to the core of the transformer, with a switching unit, which is arranged in a current path in series with the compensation winding, to the compensation winding in a current
- the switching unit is controllable by means of a control provided by a control variable; Furthermore, the present invention relates to a method for converting a transformer.
- electrical transformers as they are used in energy distribution networks, it may be to a
- DC component can, for example, electronic
- Construction components come as they are today in the
- GIC Global System for Mobile Communications
- a DC component in the core of the transformer results in a DC component, which is superimposed on the AC flux. This leads to an asymmetric modulation of the magnetic material in the core and brings a number of disadvantages. Even a DC of a few amps can cause local heating in the transformer
- Another undesirable effect is an increased noise emission during operation of the transformer. This is especially troublesome when the transformer is installed near a living area.
- Adjuster or a controller in conjunction with an associated sensor e.g. a microphone.
- an associated sensor e.g. a microphone
- Compensation winding of a transformer for the purpose of DC minimization a compensation current is fed. From a control device with independent power source is a controllable frequency for the current flow of the
- MOSFET Semiconductor switch
- Energy for generating the compensation current is taken from a capacitor which is charged cyclically via the freewheeling circuit of the MOSFET.
- transformers as they are used in an energy distribution network, but is a capacitor as energy storage for the sake of
- the invention relates to a method for converting a transformer. This object is related to a device with the
- Switching unit network synchronous and according to a predetermined
- Direct current causes in the soft magnetic core of
- Transformers a reduction of the DC component, or cancel its effect in the core completely. As a result, it no longer comes to undesirable asymmetric modulation of the soft magnetic core. As a result, the thermal load of the winding of the transformer is lower. When operating the transformer are losses and Noise lower.
- the device can be realized with comparatively simple means. Both discrete and or programmable devices can be used and are commercially available. Of great advantage is that no energy storage, such as a battery or a capacitor, is required for the generation of the compensation current. The energy for generating the compensation current is taken directly from the compensation winding. Because of its simplicity, that is
- the application area includes both transformers in low or low voltage
- Integral corresponds to the coil voltage and thus by a suitable control strategy over a period in a simple manner DC components of this voltage integral and thus the coil current can be achieved.
- the load when switching on can be kept very low, since the temporal change of the current is limited by the inductance in the switch-on.
- control device consists essentially of two
- Function blocks consists of a phase detector and a timer.
- the phase detector detects the zero crossing of the electrical induced in the compensation winding
- Another protective measure to protect the switching device against inductive voltage peaks may be that parallel to the series circuit of inductance and
- Switching unit is provided in a parallel circuit branch overvoltage protection.
- the switching unit is formed from at least one thyristor.
- the advantage of using a thyristor is first that a thyristor with a current pulse "ignited", that can be brought into the conductive state. During the positive half-wave of the mains voltage has the
- Thyristor until the next zero crossing the property of a diode.
- the end of the current flow time is effected by the thyristor itself by the holding current is exceeded and the thyristor automatically "clears", that is, goes into the non-conductive state.
- other semiconductor switches such as GTO, IGBT transistors or other switching elements are conceivable.
- Umposcnies could be used.
- a particularly simple realization can, however, by an anti-parallel connection of two switching units,
- the fuse ensures that an excessively high current is limited.
- Control device is arranged outside the boiler of a transformer. The entire electronic circuit is thus accessible from the outside for inspection and maintenance.
- Shunt part with a sensor coil includes.
- Shunt part is at the core of the transformer, e.g. is disposed adjacent to a leg or yoke to bypass a portion of the magnetic flux. From this, guided in the shunt magnetic flux can be obtained by means of a sensor coil very easily a long-term stable sensor signal, which possibly after a signal processing the DC component shares very well. The measurement result is largely free of drift and for long-term stability. Because this detector is in
- Timer is given, the timer of a phase detector, which is the phase of the in the
- the timer may be a discrete device, or part of a digital circuit. It may be advantageous if the manipulated variable is the result of an arithmetic operation of a microprocessor.
- the microprocessor can be used at the same time for signal processing of the sensor signal.
- Arithmetic mean of this pulsating direct current can be easily specified according to the DC component to be compensated.
- the electronic switching unit remains meaningfully switched on until the pulsating direct current has decayed.
- overvoltage protection after turning off the electrical switching unit does not in fact absorb any residual magnetic energy stored in the coil.
- the device according to the invention or the method according to the invention can also be advantageous in the case of transformers already in operation
- FIG 1 shows an embodiment of the invention
- Figure 2 is a representation of the time course of the induced voltage in the compensation winding of the compensation current
- FIG. 1 shows a device 1 according to a
- the device 1 essentially consists of a circuit arrangement which is connected via the terminals K1 and K2 to a compensation winding arrangement K.
- the Compensation winding assembly K is housed in the transformer tank 12 and magnetically coupled to the core 4 of the transformer. It usually consists only of a winding with few turns, which is wound for example around a leg or a yoke part of the transformer. From the compensation winding K in the transformer tank 12 are the terminals on the terminals Kl and K2 in the
- Compensation winding K induces an electrical voltage, which is used according to the invention to combat the disturbing DC component of the magnetic flux in the core 4. This is done by network-controlled switching a switching unit T.
- the terminals K1 and K2 of the compensation winding K are connected to a control device 2.
- the control device 2 consists essentially of a phase detector P and a timer TS.
- the phase detector P e.g. a zero crossing detector initiates from the induced voltage
- Trigger signal 8 from which is supplied to a timer TS. Together with a likewise the control device 2
- Switching unit T is in a current path 3 in series with the compensation winding K and in series with an inductance L.
- the inductance L is so dimensioned that when switching through the switching unit T a flowing in a current direction, sinusoidally pulsating current waveform is fed to the compensation winding K. becomes.
- In the current path 3 is for the purpose of current limiting a
- This fuse Si is arranged in Figure 1 between the terminal Kl and a switch S.
- the switch S serves to close the current path 3
- Pulsing current in the compensation winding K by its effect reduces the disturbing DC component or completely compensated for this.
- Control device 2 of a measuring device 7 for measuring the DC component This provides the sensor signal 6, which is supplied to the control device 2.
- the measuring device 7 operates according to the above-quoted fair principle of the magnetic bypass
- PCT / EP2010 / 054857 That is, it basically consists of a magnetic shunt part that is at the core
- Connection with a signal conditioning of the DC component can be determined. Switching off the electronic switching unit T takes place at zero crossing of the current (see Figure 2). This
- Parallel branch 5 provided overvoltage protection V at
- Switching unit are minimal because when switching on, due to the inductance L in the current path 3, the inrush current is low; even when switching off the switching losses are low because the switch-off is set so that it takes place at zero crossing or at least near zero current in the current path 3.
- the arithmetic mean of the compensation current I GL is thus predetermined solely by the manipulated variable
- Thyristors are particularly suitable as switches for the switching unit T, since they are particularly suitable as switches for the switching unit T, since they are particularly suitable as switches for the switching unit T, since they are particularly suitable as switches for the switching unit T, since they are particularly suitable as switches for the switching unit T, since they are particularly suitable as switches for the switching unit T, since they are particularly suitable as switches for the switching unit T, since they are particularly suitable as switches for the switching unit T, since they are particularly suitable as switches for the switching unit T, since they are particularly suitable as switches for the switching unit T, since they are particularly suitable as switches for the switching unit T, since they are particularly suitable as switches for the switching unit T, since they are particularly suitable as switches for the switching unit T, since they are particularly suitable as switches for the switching unit T, since they are particularly suitable as switches for the switching unit T, since they are particularly suitable as switches for the switching unit T, since they are particularly suitable as switches for the switching unit T, since they are particularly suitable as switches for the switching unit T, since they are particularly suitable as switches for the switching unit T, since they are particularly
- FIG. 2 shows the time course of the in the
- the compensation current I GL has the form of juxtaposed sinusoidal half-waves 18 which are interrupted by current gaps 17, each half-wave 18 being symmetrical to half the period T / 2 of the induced voltage 10.
- the switch-on time 14 is set as described above in synchronism with the network and in accordance with the manipulated variable 9.
- the synchronization point for switching on is shown in FIG. 2 the falling zero crossing of the voltage 10.
- the switching unit T e.g. one
- Thyristor in the non-conductive state over.
- a second switching unit T ' is indicated in FIG. 1 in a broken line.
- Switching units T and T ' can be two, for example
- Manipulated variable x is a nonlinear relationship, which is shown graphically in Figure 3 and is explained in more detail below:
- T: period of the voltage at the
- Figure 3 shows the functional relationship between the compensation current I GL (based on the maximum achievable compensation current I MAX at 100 percent) as a function of the manipulated variable according to equation (4).
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Control Of Electrical Variables (AREA)
- Protection Of Transformers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2010/064397 WO2012041368A1 (en) | 2010-09-29 | 2010-09-29 | Device and method for reducing a magnetic unidirectional flux fraction in the core of a transformer |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2622614A1 true EP2622614A1 (en) | 2013-08-07 |
EP2622614B1 EP2622614B1 (en) | 2015-03-18 |
Family
ID=43038065
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10760331.8A Active EP2622614B1 (en) | 2010-09-29 | 2010-09-29 | Device and method for reducing a magnetic unidirectional flux fraction in the core of a transformer |
Country Status (8)
Country | Link |
---|---|
US (1) | US9046901B2 (en) |
EP (1) | EP2622614B1 (en) |
KR (1) | KR101720039B1 (en) |
CN (1) | CN103270561B (en) |
AU (1) | AU2010361382B2 (en) |
BR (1) | BR112013007671B1 (en) |
CA (1) | CA2813057C (en) |
WO (1) | WO2012041368A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9941046B2 (en) | 2016-01-25 | 2018-04-10 | Siemens Aktiengesellschaft | Circuit arrangement for reducing a unidirectional flux component in the soft-magnetic core of a transformer |
US10062502B2 (en) | 2015-12-09 | 2018-08-28 | Siemens Ag Österreich | Circuit arrangement for compensation of a DC component in a transformer |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BR112015029477B8 (en) | 2013-05-28 | 2023-04-25 | Siemens Ag | APPARATUS FOR REDUCING A UNIDIRECTIONAL MAGNETIC FLUX COMPONENT IN THE CORE OF A TRANSFORMER |
CN105793935B (en) * | 2013-12-10 | 2018-01-26 | 西门子公司 | For reducing the apparatus and method of the unidirectional flux component in the iron core of transformer |
CN105830182B (en) * | 2013-12-10 | 2018-07-10 | 西门子公司 | For reducing the device and method of the unidirectional flux component in the iron core of three-phase transformer |
EP2905792B1 (en) * | 2014-02-06 | 2016-09-21 | Siemens Aktiengesellschaft | Device for reducing a magnetic unidirectional flux component in the core of a transformer |
CA2942991C (en) * | 2014-03-19 | 2019-09-03 | Siemens Aktiengesellschaft | Dc compensation for high dc current in transformer |
EP3021335B1 (en) | 2014-11-11 | 2018-12-26 | Siemens Aktiengesellschaft | Assembly and method for reducing a magnetic unidirectional flux component in the core of a transformer |
EP3065150B1 (en) | 2015-03-05 | 2017-11-29 | Siemens Aktiengesellschaft | Transformer |
EP3076411B1 (en) * | 2015-04-01 | 2017-11-29 | Siemens Aktiengesellschaft | Circuit assembly for reducing a magnetic unidirectional flux fraction in the core of a transformer |
US11146053B2 (en) | 2016-01-29 | 2021-10-12 | Power Hv Inc. | Bushing for a transformer |
DE102018222183A1 (en) * | 2018-12-18 | 2020-06-18 | Siemens Aktiengesellschaft | Magnetically adjustable choke coil in series connection |
EP3783630B1 (en) * | 2019-08-22 | 2023-10-04 | Siemens Energy Global GmbH & Co. KG | Device for suppressing a direct current component during the operation of an electrical appliance connected to a high-voltage network |
EP3786986B1 (en) | 2019-08-28 | 2023-10-04 | Siemens Energy Global GmbH & Co. KG | Circuit assembly for the reduction of a unidirectional flux component in the soft magnetic core of a transformer |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2013000A (en) | 1978-01-20 | 1979-08-01 | Hitachi Ltd Dc | D.C. magnetic field cancellation circuit |
US4346340A (en) * | 1980-04-30 | 1982-08-24 | Hackett Jones Francis C | Method and means for controlling the flux density in the core of an inductor |
DE3631438A1 (en) | 1986-09-16 | 1988-03-17 | Telefonbau & Normalzeit Gmbh | Circuit arrangement to compensate for direct-current magnetomotive forces in transformers |
DE4021860C2 (en) | 1990-07-09 | 1996-08-22 | Siemens Ag | Circuit arrangement and method for reducing noise in a transformer |
CN2256154Y (en) * | 1995-03-01 | 1997-06-11 | 郑文京 | High speed electronic mutual inductor with power supply |
WO2004013951A2 (en) * | 2002-08-05 | 2004-02-12 | Engineering Matters, Inc. | Self-powered direct current mitigation circuit for transformers |
WO2008151661A1 (en) | 2007-06-12 | 2008-12-18 | Siemens Transformers Austria Gmbh & Co Kg | Electrical transformer with unidirectional flux compensation |
-
2010
- 2010-09-29 CA CA2813057A patent/CA2813057C/en active Active
- 2010-09-29 BR BR112013007671-2A patent/BR112013007671B1/en not_active IP Right Cessation
- 2010-09-29 WO PCT/EP2010/064397 patent/WO2012041368A1/en active Application Filing
- 2010-09-29 KR KR1020137010986A patent/KR101720039B1/en active IP Right Grant
- 2010-09-29 US US13/876,946 patent/US9046901B2/en active Active
- 2010-09-29 AU AU2010361382A patent/AU2010361382B2/en not_active Ceased
- 2010-09-29 CN CN201080069368.3A patent/CN103270561B/en active Active
- 2010-09-29 EP EP10760331.8A patent/EP2622614B1/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2012041368A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10062502B2 (en) | 2015-12-09 | 2018-08-28 | Siemens Ag Österreich | Circuit arrangement for compensation of a DC component in a transformer |
US9941046B2 (en) | 2016-01-25 | 2018-04-10 | Siemens Aktiengesellschaft | Circuit arrangement for reducing a unidirectional flux component in the soft-magnetic core of a transformer |
Also Published As
Publication number | Publication date |
---|---|
KR101720039B1 (en) | 2017-03-27 |
CA2813057A1 (en) | 2012-04-05 |
AU2010361382A1 (en) | 2013-04-11 |
US20130201592A1 (en) | 2013-08-08 |
WO2012041368A1 (en) | 2012-04-05 |
KR20130099982A (en) | 2013-09-06 |
EP2622614B1 (en) | 2015-03-18 |
CN103270561A (en) | 2013-08-28 |
US9046901B2 (en) | 2015-06-02 |
BR112013007671B1 (en) | 2020-11-03 |
AU2010361382B2 (en) | 2014-07-24 |
BR112013007671A2 (en) | 2016-08-09 |
CA2813057C (en) | 2018-01-02 |
CN103270561B (en) | 2016-09-21 |
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