CN109889055A - A kind of power transformer low frequency demagnetization power supply - Google Patents
A kind of power transformer low frequency demagnetization power supply Download PDFInfo
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- CN109889055A CN109889055A CN201910214163.2A CN201910214163A CN109889055A CN 109889055 A CN109889055 A CN 109889055A CN 201910214163 A CN201910214163 A CN 201910214163A CN 109889055 A CN109889055 A CN 109889055A
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- low frequency
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Abstract
The present invention relates to a kind of low frequency demagnetization power supplys, it is characterized by comprising three-phase alternating-current supply, three-phase bridge rectifier circuit, filter circuit, bridge-type low frequency inverter circuits, wherein the three-phase alternating-current supply is connected with the input terminal of three-phase bridge rectifier circuit, the output end of the three-phase bridge rectifier circuit is connected with the input terminal of filter circuit, the output end of the filter circuit is connected with the input terminal of bridge-type low frequency inverter circuit, and the output end of bridge-type low frequency inverter circuit is connected with the primary side of transformer.The present invention uses low-frequency power demagnetization, the volume ratio power frequency demagnetization of power supply is compared and is substantially reduced, and erasure effect has reached the level of AC erasing, the good feature of existing erasure effect, also the small advantage of equipment volume is had both, can be realized the efficient demagnetization of large-scale power transformer.
Description
Technical field
The invention belongs to electrical equipment technical fields, and in particular to a kind of transformer low frequency demagnetization power supply.
Background technique
In large-scale power transformer use process, due to various reasons, there are iron core unidirectional magnetiztion phenomenon, unidirectional magnetiztions
Noise and iron loss when the remanent magnetism of generation will lead to transformer station high-voltage side bus increase, and bring hidden danger to the safe operation of transformer.So
Transformer all should carry out demagnetization processing to it there are when remanent magnetism.Conventional demagnetization method has: power frequency supply demagnetization method, direct current
Demagnetization method.Since the operating voltage of Coefficients of Large Power Transformer Winding is high, the demagnetization voltage that when demagnetization needs often reaches volts up to ten thousand even
Hundreds of thousands volt, this power supply are not readily available at the scene, and the usual preferable industrial frequency AC demagnetization method of effect is only in transformer
Manufactory can just satisfy the requirements.Dc erasing method has the advantages that small in size, is that transformer field degaussing operation relatively mostly uses
Method, but there is also certain gap, the remanence ratio AC erasings of dc erasing compared with AC erasing for dc erasing effect
Remanent magnetism it is big.
The transformer demagnetization power supply high-efficient and small occupied area therefore, it is necessary to a kind of demagnetization.
Summary of the invention
For the deficiency of existing demagnetization method, demagnetization can be carried out to large-scale power transformer the present invention provides a kind of
Low-frequency ac power, the good feature of existing erasure effect also have both the small advantage of equipment volume.
The invention is realized by the following technical scheme.
A kind of low frequency demagnetization power supply, it is characterised in that: including three-phase alternating-current supply, three-phase bridge rectifier circuit, filtered electrical
Road, bridge-type low frequency inverter circuit, wherein the three-phase alternating-current supply is connected with the input terminal of three-phase bridge rectifier circuit, described three
The output end of phase bridge rectifier is connected with the input terminal of filter circuit, and the output end and bridge-type low frequency of the filter circuit are inverse
The input terminal on power transformation road is connected, and the output end of bridge-type low frequency inverter circuit is connected with the primary side of transformer.
Further, three-phase bridge rectifier circuit is made of the diode of six same models.
Further, filter circuit is filter condenser.
Further, bridge-type low frequency inverter circuit is single-phase bridge low frequency inverter, by the triode of four same models
Composition.
Further, the input terminal phase of the controlled end of the triode in single-phase bridge low frequency inverter and driving signal device
Even.
Four triodes in bridge-type low frequency inverter circuit are with rectangular array, wherein three poles in the upper left corner and the lower right corner
The driving signal of the controlled end of pipe is identical first driving signal, it is ensured that the two triodes can start fortune simultaneously at work
Row.The driving signal of the controlled end of the triode in the lower left corner and the upper right corner is identical second driving signal, it is ensured that the two three
Pole pipe can start operation simultaneously at work.First driving signal and the second driving signal are all SPWM signal, the first driving letter
Number work when, the second driving signal does not work, similarly the second driving signal work when, the first driving signal does not work.
The operation principle of the present invention is that:
When carrying out demagnetization to transformer, equivalent circuit is as shown in Figure 1.
X1, R1, Rm in equivalent circuit is smaller compared with Xm, can be ignored, Xm=2 π fLm, when use power frequency electric
When source, Xm is up to tens kilo-ohms, to reach degaussing effect, generally requires erasing current being added to swashing under 1.1 times of voltage ratings
Magnetoelectricity stream, the voltage being applied in transformer winding are very high.
But use low-frequency power demagnetization when, the frequency for the power supply that pressurizes be only work frequency 1 percent in addition thousand/
1 percent even one thousandth, the degaussing supply voltages needed when one, Xm are reduced to power frequency are also significantly less than power frequency electric
The capacity in source, degaussing power supply substantially reduces, the volume of power supply be also reduced to the comparable degree of direct current degaussing power supply, meet
The requirement of magnetic effect and field conduct.
The present invention uses low-frequency power demagnetization, and the volume ratio power frequency demagnetization of power supply, which is compared, to be substantially reduced, and erasure effect
The level of AC erasing is reached, the good feature of existing erasure effect also has both the small advantage of equipment volume, can be realized large size
The efficient demagnetization of power transformer.
Detailed description of the invention
The technical program is described further with reference to the accompanying drawing:
Fig. 1 is the equivalent circuit diagram of transformer demagnetization of the invention.
Fig. 2 is the schematic diagram of low-frequency power of the invention.
Specific embodiment
As shown in Fig. 2, a kind of low frequency demagnetization power supply, including three-phase alternating-current supply 1, three-phase bridge rectifier circuit 2, filtered electrical
Road 3, bridge-type low frequency inverter circuit 4, wherein the three-phase alternating-current supply is connected with the input terminal of three-phase bridge rectifier circuit, it is described
The output end of three-phase bridge rectifier circuit is connected with the input terminal of filter circuit, the output end and bridge-type low frequency of the filter circuit
The input terminal of inverter circuit is connected, and the output end of bridge-type low frequency inverter circuit is connected with the primary side of transformer 5.
Three-phase bridge rectifier circuit 2 is made of the diode of six same models.
Filter circuit 3 is filter condenser.
Bridge-type low frequency inverter circuit 4 is single-phase bridge low frequency inverter, is made of the triode of four same models.
The controlled end of triode in single-phase bridge low frequency inverter is connected with the input terminal of driving signal device.
Four triodes in bridge-type low frequency inverter circuit 4 are with rectangular array, wherein the three of the upper left corner and the lower right corner
The driving signal of the controlled end g11 and g14 of pole pipe are identical first driving signal, it is ensured that the two triodes at work can
Start operation simultaneously.The driving signal of the controlled end g12 and g13 of the triode in the lower left corner and the upper right corner are identical second driving
Signal, it is ensured that the two triodes can start operation simultaneously at work.First driving signal and the second driving signal are all
SPWM wave signal, when the first driving signal works, the second driving signal does not work, when similarly the second driving signal works, first
Driving signal does not work.
In use, excitation current when voltage rating unloaded according to transformer factory, control low frequency output voltage gradually rise
Height arrives the unloaded excitation current of transformer, after reaching unloaded excitation current, gradually decreases demagnetization supply voltage to zero, does 3 repeatedly
It is recycled to 5, completes a degaussing process.
Applicant combines Figure of description to be described in detail and describe the embodiment of the present invention, but this field skill
Art personnel are it should be understood that above embodiments are only the preferred embodiments of the invention, and explanation is intended merely to help reader in detail
More fully understand spirit of that invention, and it is not intended to limit the protection scope of the present invention, on the contrary, any based on invention essence of the invention
Any improvement or modification made by mind should all be fallen within the scope and spirit of the invention.
Claims (5)
1. a kind of low frequency demagnetization power supply, it is characterised in that: including three-phase alternating-current supply, three-phase bridge rectifier circuit, filter circuit,
Bridge-type low frequency inverter circuit, wherein the three-phase alternating-current supply is connected with the input terminal of three-phase bridge rectifier circuit, the three-phase
The output end of bridge rectifier is connected with the input terminal of filter circuit, the output end of the filter circuit and the inversion of bridge-type low frequency
The input terminal of circuit is connected, and the output end of bridge-type low frequency inverter circuit is connected with the primary side of transformer；
Four triodes in bridge-type low frequency inverter circuit are with rectangular array, the wherein triode in the upper left corner and the lower right corner
The driving signal of controlled end is identical first driving signal, it is ensured that the two triodes can start operation simultaneously at work；
The driving signal of the controlled end of the triode in the lower left corner and the upper right corner is identical second driving signal, it is ensured that the two triodes
Operation can be started simultaneously at work；First driving signal and the second driving signal are all SPWM signal, the first driving signal work
When making, the second driving signal does not work, and when similarly the second driving signal works, the first driving signal does not work.
2. low frequency demagnetization power supply according to claim 1, wherein the three-phase bridge rectifier circuit is by the two of six same models
Pole pipe composition.
3. low frequency demagnetization power supply according to claim 1, wherein the filter circuit is filter condenser.
4. low frequency demagnetization power supply according to claim 1, wherein the bridge-type low frequency inverter circuit is the inversion of single-phase bridge low frequency
Device is made of the triode of four same models.
5. low frequency demagnetization power supply according to claim 4, wherein triode in the single-phase bridge low frequency inverter is controlled
End is connected with the input terminal of driving signal device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910214163.2A CN109889055A (en) | 2019-03-20 | 2019-03-20 | A kind of power transformer low frequency demagnetization power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910214163.2A CN109889055A (en) | 2019-03-20 | 2019-03-20 | A kind of power transformer low frequency demagnetization power supply |
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| Publication Number | Publication Date |
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| CN109889055A true CN109889055A (en) | 2019-06-14 |
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| CN201910214163.2A Pending CN109889055A (en) | 2019-03-20 | 2019-03-20 | A kind of power transformer low frequency demagnetization power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110994573A (en) * | 2019-11-22 | 2020-04-10 | 重庆市送变电工程有限公司 | Leakage protection circuit based on transformer reversal polarity demagnetization method |
| CN111029082A (en) * | 2019-11-27 | 2020-04-17 | 中国电力科学研究院有限公司 | Device and method for eliminating residual magnetism of transformer core and outputting constant-voltage variable-frequency voltage |
| CN112067879A (en) * | 2020-09-07 | 2020-12-11 | 国网天津市电力公司 | Lightning arrester in-service continuous current measuring device based on independent demagnetization technology |
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| US20070115603A1 (en) * | 2005-11-24 | 2007-05-24 | Albert Maurer | Demagnetization method by way of alternating current impulses in a conductor loop put in loops |
| CN101499727A (en) * | 2008-01-30 | 2009-08-05 | 林青云 | Energy output controlling method and circuit |
| CN102403086A (en) * | 2010-09-07 | 2012-04-04 | 中国石油天然气集团公司 | Pipeline port hysteresis buffer demagnetizer |
| CN203705575U (en) * | 2014-03-10 | 2014-07-09 | 苏州工业园区海沃科技有限公司 | Dual-mode power transformer partial discharge, zero load and load test system |
| CN105093140A (en) * | 2015-08-19 | 2015-11-25 | 国网四川省电力公司阿坝供电公司 | Transformer remanence detection and demagnetization method and device |
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2019
- 2019-03-20 CN CN201910214163.2A patent/CN109889055A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070115603A1 (en) * | 2005-11-24 | 2007-05-24 | Albert Maurer | Demagnetization method by way of alternating current impulses in a conductor loop put in loops |
| CN101499727A (en) * | 2008-01-30 | 2009-08-05 | 林青云 | Energy output controlling method and circuit |
| CN102403086A (en) * | 2010-09-07 | 2012-04-04 | 中国石油天然气集团公司 | Pipeline port hysteresis buffer demagnetizer |
| CN203705575U (en) * | 2014-03-10 | 2014-07-09 | 苏州工业园区海沃科技有限公司 | Dual-mode power transformer partial discharge, zero load and load test system |
| CN105093140A (en) * | 2015-08-19 | 2015-11-25 | 国网四川省电力公司阿坝供电公司 | Transformer remanence detection and demagnetization method and device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110994573A (en) * | 2019-11-22 | 2020-04-10 | 重庆市送变电工程有限公司 | Leakage protection circuit based on transformer reversal polarity demagnetization method |
| CN111029082A (en) * | 2019-11-27 | 2020-04-17 | 中国电力科学研究院有限公司 | Device and method for eliminating residual magnetism of transformer core and outputting constant-voltage variable-frequency voltage |
| CN111029082B (en) * | 2019-11-27 | 2023-02-28 | 中国电力科学研究院有限公司 | Device and method for eliminating residual magnetism of transformer core and outputting constant-voltage variable-frequency voltage |
| CN112067879A (en) * | 2020-09-07 | 2020-12-11 | 国网天津市电力公司 | Lightning arrester in-service continuous current measuring device based on independent demagnetization technology |
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