CN106558406A - A kind of suppressing method of power transformer D.C. magnetic biasing - Google Patents
A kind of suppressing method of power transformer D.C. magnetic biasing Download PDFInfo
- Publication number
- CN106558406A CN106558406A CN201610882024.3A CN201610882024A CN106558406A CN 106558406 A CN106558406 A CN 106558406A CN 201610882024 A CN201610882024 A CN 201610882024A CN 106558406 A CN106558406 A CN 106558406A
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- current
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- transformer
- power transformer
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- 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
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- 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
-
- 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
- H01F27/40—Structural association with built-in electric component, e.g. fuse
Abstract
The invention discloses a kind of suppressing method of power transformer D.C. magnetic biasing, the input and output of power transformer are three-phase, power transformer is made up of three first windings and three Secondary Windings, in the common core of power transformer, the coiling tertiary winding is used as DC compensation winding, connect in the tertiary winding and access the DC current source of a current control, and a DC current transformer is installed at the neutral point of the first winding, the tertiary winding has three, adopts and be connected serially；DC current opposite polarity at the current polarity and transformator first winding neutral point of DC current source output.The present invention starts with from the internal structure of transformer body, carries out the suppression of transformer DC magnetic bias, advantage of lower cost, and with good feasibility, dependable with function, can realize good D.C. magnetic biasing inhibition.
Description
Technical field
The present invention relates to high voltage power transmission and transforming technical field, and in particular to a kind of suppression side of power transformer D.C. magnetic biasing
Method.
Background technology
With the development of power system, supertension, extra-high voltage direct-current transmission technology have obtained more and more wider in China
General application.But in actual motion, when supertension, extra-high voltage DC transmission system are in the one pole ground return circuit method of operation
Or during bipolar off-center operation mode, there is DC magnetic bias phenomena in the transformator for being easily caused AC Substation around current conversion station.
In addition, geomagnetic induction current will also result in transformator produces D.C. magnetic biasing.
Transformer DC magnetic bias show as：1）Noise increases；2）Vibration aggravation；3）Hot-spot；4）Cause voltage waveform
Distortion；5）Transformer loss increases.
The existing method for solving power transformer D.C. magnetic biasing mainly has following three kinds：
1）Resistance is accessed in transformer neutral point；
2）Electric capacity is accessed in transformer neutral point；
3）Reverse current is injected in transformer neutral point；
1 low cost of said method, easily promotes.But other transformer neutral point direct currents nearby can be caused exceeded, it is impossible to support completely
Disappear from neutrality click through into direct current, and the access of neutral point resistor changes the zero-sequence reactance of AC system, and protection definite value is needed
Again adjust, thus it is complex on resistor parameter is selected.
Said method 2 has thoroughly every straight effect.But for the overvoltage at capacitor two ends during fault restriction, need
Install bulk voltage device additional, need larger installing space, and it is expensive.
Said method 3 can control the reverse dc of injection neutral point, but device according to the flexible in size of DC quantity
Realize and control strategy is complicated, difficulty is very big, and cost is higher.
Said method all installs restraining device on transformer neutral point, and this may cause the transformator of other positions neutral
The change of the DC current that point flows through, while said method is starting point all from compensating, weakening and exclude DC current, belongs to
External governance measure, all can bring new power grid security problem to some extent.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of suppressing method of power transformer D.C. magnetic biasing, from transformator
The internal structure of body is started with, and carries out the suppression of transformer DC magnetic bias, advantage of lower cost, and with good feasibility,
Dependable with function, can realize good D.C. magnetic biasing inhibition.
In order to solve above-mentioned technical problem, the technical scheme that the present invention is provided is as follows：
A kind of suppressing method of power transformer D.C. magnetic biasing, the input and output of the power transformer are three-phase, and electric power becomes
Depressor is made up of three first windings and three Secondary Windings, the coiling tertiary winding conduct in the common core of power transformer
DC compensation winding, the series connection in the tertiary winding access the DC current source of a current control, and it is described once around
One DC current transformer is installed at the neutral point of group,
The DC current values that measurement is obtained are sent to the DC current source, the DC current by the DC current transformer
Source exports DC current to the tertiary winding according to the DC current values for receiving；
The tertiary winding has three, adopts and is connected serially；
DC current opposite polarity at the current polarity and transformator first winding neutral point of the DC current source output.
The DC current source is obtained by the following formula to the DC current values that the tertiary winding is exported：
Wherein,N 1 For the first winding number of turn,N 3 For the number of turn of the tertiary winding,I 1At power transformer first winding neutral point
The DC current values for measuring,I 3For the DC current values that DC current source is exported to the tertiary winding.
The DC current source is furnished with communication interface, for the DC current that will be measured at the neutral point including first winding
The working condition of value, the DC current values of DC current source output and DC current source is sent to monitoring in interior information
Platform.
The power transformer is the three-phase transformer group that three-phase transformer or three single-phase transformers are constituted.
Three first windings of the power transformer connect according to Y type modes, and three Secondary Windings are according to △ type modes
Connection.
The invention has the advantages that：
1st, set about from the internal structure of transformer body, increased a DC compensation winding, measured with transformer neutral point
DC current is control foundation, the DC current polarity that order is flow through per the DC current in phase compensative winding and transformer neutral point
Contrary and proportional relation, so as to serve good D.C. magnetic biasing inhibition；
2nd, the addition of DC compensation winding, does not change the electric current in transformator, so as to cause the transformator of other positions
The significant change of middle direct current；
3rd, the present invention will not change the parameter of power system, not affect the existing configurations such as exterior overvoltage protection, relay protection,
The influence degree to power grid security is reduced so as to high degree.
Description of the drawings
Fig. 1 is the fundamental diagram of the present invention.
Specific embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings, so that those skilled in the art can be with
More fully understand the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
As shown in figure 1, a kind of input of power transformer adopted by suppressing method of power transformer D.C. magnetic biasing is defeated
Go out to be three-phase, the three-phase transformer group, or a three-phase transformer of three single-phase transformers compositions can be adopted, by
Six winding compositions being wound on public multicolumn iron core, are placed in single casing.
Either three-phase transformer group or three-phase transformer, can regard as three first windings and three it is secondary around
Group is constituted according to specific connected mode respectively, it is preferred that three first windings connect according to Y type modes, three Secondary Windings
Connect according to △ type modes.
In the common core of power transformer, the coiling tertiary winding is connected in the tertiary winding as DC compensation winding
The DC current source of a current control is accessed, and a DC current transformer is installed at the neutral point of first winding, the
Three winding has three, adopts and is connected serially；
DC current transformer will measure the DC current values that obtain and be sent to DC current source, and DC current source is according to receiving
DC current values to the tertiary winding export DC current；
DC current opposite polarity at the current polarity and transformator first winding neutral point of DC current source output.
The DC current values that DC current source is exported to the tertiary windingI 3It is obtained by the following formula：
Wherein,N 1 For the first winding number of turn,N 3 For the number of turn of the tertiary winding,I 1At power transformer first winding neutral point
The DC current values for measuring,I 3For the DC current values that DC current source is exported to the tertiary winding.
Further, DC current source is furnished with communication interface, for the unidirectional current measured at the neutral point by first winding
The information such as the working condition of flow valuve, the DC current values of DC current source output and DC current source are sent to monitoring backstage.
The present embodiment is set about from the internal structure of transformer body, increased a tertiary winding as DC compensation around
Group, the series connection in DC compensation winding access the DC current source of a current control, are measured with power transformer neutral point
DC current is control foundation, the DC current that order is flow through per the DC current in phase compensative winding and power transformer neutral point
Opposite polarity and proportional relation so that the compensation magnetomotive force per phase compensative winding be equal to power transformer primary side per around
Direct current magnetomotive force in group, due in opposite direction, therefore can be completely counterbalanced by the straight of transformator first side winding in the ideal case
Stream magnetomotive force, serves good D.C. magnetic biasing inhibition.
The present embodiment carries out D.C. magnetic biasing suppression by the way of DC compensation winding is added, and does not change power transformer
Middle electric current, therefore the significant change of direct current in the power transformer of other positions will not be caused.
Carried out during transformer manufacturing using the installation of the DC magnetic biasing suppression device of the present embodiment method, with
Additive method is compared, and the DC magnetic biasing suppression device installation difficulty is low, and precision and unfailing performance access preferably guarantee, while
By optimization design, the DC magnetic biasing suppression device can be made to be integrated on transformer body, save installing space.
The present embodiment will not change the parameter of power system, not affect exterior overvoltage protection, relay protection etc. existing
Configuration, is preferably minimized the influence degree to power grid security.
Embodiment described above is only to absolutely prove the present invention and the preferred embodiment lifted, the protection model of the present invention
Enclose not limited to this.Equivalent substitute or conversion that those skilled in the art are made on the basis of the present invention, in the present invention
Protection domain within.Protection scope of the present invention is defined by claims.
Claims (5)
1. a kind of suppressing method of power transformer D.C. magnetic biasing, the input and output of the power transformer are three-phase, electric power
Transformator is made up of three first windings and three Secondary Windings, it is characterized in that, the coiling in the common core of power transformer
The tertiary winding is connected in the tertiary winding and accesses the DC current source of a current control as DC compensation winding, and
A DC current transformer is installed at the neutral point of the first winding,
The DC current values that measurement is obtained are sent to the DC current source, the DC current by the DC current transformer
Source exports DC current to the tertiary winding according to the DC current values for receiving；
The tertiary winding has three, adopts and is connected serially；
DC current opposite polarity at the current polarity and transformator first winding neutral point of the DC current source output.
2. the suppressing method of power transformer D.C. magnetic biasing as claimed in claim 1, is characterized in that, the DC current source to
The DC current values of tertiary winding output are obtained by the following formula：
Wherein,N 1 For the first winding number of turn,N 3 For the number of turn of the tertiary winding,I 1To survey at power transformer first winding neutral point
The DC current values for obtaining,I 3For the DC current values that DC current source is exported to the tertiary winding.
3. the suppressing method of power transformer D.C. magnetic biasing as claimed in claim 1 or 2, is characterized in that, the DC current
Source is furnished with communication interface, for including what the DC current values measured at the neutral point of first winding, DC current source were exported
The working condition of DC current values and DC current source is sent to monitoring backstage in interior information.
4. the suppressing method of power transformer D.C. magnetic biasing as claimed in claim 1, is characterized in that, the power transformer is
The three-phase transformer group that three-phase transformer or three single-phase transformers are constituted.
5. the suppressing method of power transformer D.C. magnetic biasing as claimed in claim 1, is characterized in that, the power transformer
Three first windings connect according to Y type modes, and three Secondary Windings connect according to △ type modes.
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| CN201610882024.3A CN106558406B (en) | 2016-10-10 | 2016-10-10 | A kind of suppressing method of power transformer D.C. magnetic biasing |
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| CN201610882024.3A CN106558406B (en) | 2016-10-10 | 2016-10-10 | A kind of suppressing method of power transformer D.C. magnetic biasing |
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| CN106558406B CN106558406B (en) | 2019-07-09 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107507698A (en) * | 2017-08-30 | 2017-12-22 | 杭州钱江电气集团股份有限公司 | A kind of transformer for suppressing function with D.C. magnetic biasing |
| CN108400005A (en) * | 2018-04-26 | 2018-08-14 | 湖南大学 | A kind of transformer DC magnetic bias suppression system and suppressing method |
| CN110197759A (en) * | 2018-02-26 | 2019-09-03 | 西门子公司 | Transformer, three-phase transformer and its mode of connection |
| CN110632372A (en) * | 2019-08-26 | 2019-12-31 | 深圳供电局有限公司 | Monitoring method for direct current magnetic bias of power transformer |
| CN113391110A (en) * | 2021-06-21 | 2021-09-14 | 陈德才 | Active current transformer capable of resisting direct current component |
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| US5499150A (en) * | 1992-05-11 | 1996-03-12 | Matsushita Electric Industrial Co., Ltd. | Magnetic head |
| CN101718852A (en) * | 2009-12-04 | 2010-06-02 | 中国电力科学研究院 | Online detection and calibration method for Hall current sensor |
| CN103824689A (en) * | 2014-03-06 | 2014-05-28 | 山东达驰电气有限公司 | Rectifier transformer adopting series winding |
| CN203720342U (en) * | 2014-03-12 | 2014-07-16 | 国家电网公司 | Direct current magnetic bias automatic compensation device of metering winding of current transformer |
| CN204794020U (en) * | 2015-05-29 | 2015-11-18 | 广西电网有限责任公司电力科学研究院 | Transformer system |
-
2016
- 2016-10-10 CN CN201610882024.3A patent/CN106558406B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5499150A (en) * | 1992-05-11 | 1996-03-12 | Matsushita Electric Industrial Co., Ltd. | Magnetic head |
| CN101718852A (en) * | 2009-12-04 | 2010-06-02 | 中国电力科学研究院 | Online detection and calibration method for Hall current sensor |
| CN103824689A (en) * | 2014-03-06 | 2014-05-28 | 山东达驰电气有限公司 | Rectifier transformer adopting series winding |
| CN203720342U (en) * | 2014-03-12 | 2014-07-16 | 国家电网公司 | Direct current magnetic bias automatic compensation device of metering winding of current transformer |
| CN204794020U (en) * | 2015-05-29 | 2015-11-18 | 广西电网有限责任公司电力科学研究院 | Transformer system |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107507698A (en) * | 2017-08-30 | 2017-12-22 | 杭州钱江电气集团股份有限公司 | A kind of transformer for suppressing function with D.C. magnetic biasing |
| CN110197759A (en) * | 2018-02-26 | 2019-09-03 | 西门子公司 | Transformer, three-phase transformer and its mode of connection |
| CN108400005A (en) * | 2018-04-26 | 2018-08-14 | 湖南大学 | A kind of transformer DC magnetic bias suppression system and suppressing method |
| CN108400005B (en) * | 2018-04-26 | 2020-12-25 | 湖南大学 | Transformer direct-current magnetic bias suppression system and suppression method |
| CN110632372A (en) * | 2019-08-26 | 2019-12-31 | 深圳供电局有限公司 | Monitoring method for direct current magnetic bias of power transformer |
| CN110632372B (en) * | 2019-08-26 | 2021-08-17 | 深圳供电局有限公司 | Monitoring method for direct current magnetic bias of power transformer |
| CN113391110A (en) * | 2021-06-21 | 2021-09-14 | 陈德才 | Active current transformer capable of resisting direct current component |
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| Publication number | Publication date |
|---|---|
| CN106558406B (en) | 2019-07-09 |
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