CN106558406B - 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
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- CN106558406B CN106558406B CN201610882024.3A CN201610882024A CN106558406B CN 106558406 B CN106558406 B CN 106558406B CN 201610882024 A CN201610882024 A CN 201610882024A CN 106558406 B CN106558406 B CN 106558406B
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000004804 winding Methods 0.000 claims abstract description 71
- 230000007935 neutral effect Effects 0.000 claims abstract description 26
- 238000004891 communication Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 2
- 230000002401 inhibitory effect Effects 0.000 abstract description 4
- 230000005764 inhibitory process Effects 0.000 abstract description 4
- 238000009434 installation Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000001447 compensatory effect Effects 0.000 description 3
- 230000001629 suppression Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000005404 monopole Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000001131 transforming 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
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The invention discloses a kind of suppressing methods of power transformer D.C. magnetic biasing, the input and output of power transformer are three-phase, power transformer is made of three first windings and three secondary windings, the coiling tertiary winding is as DC compensation winding in the common core of power transformer, the DC current source of one current control of series connection access in the tertiary winding, and a DC current transformer is installed at the neutral point of the first winding, there are three the tertiary windings, adopts and is connected serially；The current polarity of DC current source output is opposite with the DC current polarity at transformer first winding neutral point.The present invention starts with from the internal structure of transformer body, carries out the inhibition of transformer DC magnetic bias, advantage of lower cost, and have good feasibility, dependable with function can be realized good D.C. magnetic biasing inhibitory effect.
Description
Technical field
The present invention relates to high voltage power transmission and transforming technical fields, and in particular to a kind of inhibition side of power transformer D.C. magnetic biasing
Method.
Background technique
With the development of electric system, super-pressure, extra-high voltage direct-current transmission technology have obtained more and more extensively China
General application.But in actual operation, when super-pressure, extra-high voltage DC transmission system are in the monopole ground return circuit method of operation
Or when bipolar off-center operation mode, the transformer of AC Substation around converter station is easy to cause DC magnetic bias phenomena occur.
In addition, geomagnetic induction current, which will also result in transformer, generates D.C. magnetic biasing.
Transformer DC magnetic bias shows themselves in that 1) noise increase；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) capacitor is accessed in transformer neutral point；
3) reverse current is injected in transformer neutral point；
The above method 1 is at low cost, easily promotes.But other transformer neutral point direct currents are exceeded near will lead to, it cannot be complete
It is complete offset from neutrality click through into direct current, and the access of neutral point resistor changes the zero-sequence reactance of AC system, and protection is determined
Value need to adjust again, therefore complex in resistor parameter selection.
The above method 2 has thorough blocking effect.But it for the overvoltage at capacitor both ends during fault restriction, needs
It installs bulk voltage device additional, needs biggish installation space, and expensive.
The above method 3 can control the reverse dc of injection neutral point, but device according to the flexible in size of DC quantity
Tactful complexity is realized and controlled, difficult, cost is higher.
The above method is installed all on transformer neutral point inhibits device, and the transformer that this may cause other positions is neutral
The variation of DC current that point flows through, at the same the above method all from compensation, to weaken and exclude DC current be starting point, belong to
External governance measure can all bring new power grid security problem to some extent.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of suppressing methods of power transformer D.C. magnetic biasing, from transformer
The internal structure of ontology is started with, and carries out the inhibition of transformer DC magnetic bias, advantage of lower cost, and have good feasibility,
Dependable with function can be realized good D.C. magnetic biasing inhibitory effect.
In order to solve the above technical problem, the present invention provides technical solution it 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, electricity
Power transformer is made of three first windings and three secondary windings, the coiling tertiary winding in the common core of power transformer
As DC compensation winding, the DC current source of one current control of series connection access in the tertiary winding, and described one
One DC current transformer is installed at the neutral point of secondary winding,
The DC current values that measurement obtains are sent to the DC current source, the direct current by the DC current transformer
Current source exports DC current to the tertiary winding according to the DC current values received；
There are three the tertiary windings, adopts and is connected serially；
The current polarity of the DC current source output and the DC current polarity phase at transformer first winding neutral point
Instead.
The DC current source is obtained by the following formula to the DC current values that the tertiary winding exports:
Wherein,N 1 For first winding the number of turns,N 3 For the number of turns of the tertiary winding,I 1For power transformer first winding neutral point
The DC current values that place measures,I 3The DC current values exported for DC current source to the tertiary winding.
The DC current source is furnished with communication interface, for by include first winding neutral point at the DC current that measures
After information including the working condition of value, the DC current values of DC current source output and DC current source is sent to monitoring
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 are connected according to Y type mode, and three secondary windings are according to △ type mode
Connection.
The invention has the following advantages:
1, set about from the internal structure of transformer body, increase a DC compensation winding, surveyed with transformer neutral point
The DC current obtained is control foundation, the DC current for enabling DC current and transformer neutral point in every phase compensative winding flow through
Polarity is opposite and proportional relationship, to play good D.C. magnetic biasing inhibitory effect；
2, the addition of DC compensation winding does not change the electric current in transformer, to will not cause the change of other positions
The significant change of direct current in depressor；
3, the present invention will not change the parameter of electric system, and it is existing not influence exterior overvoltage protection, relay protection etc.
Configuration, thus the influence degree of high degree reduced to power grid security.
Detailed description of the invention
Fig. 1 is the working principle of the invention figure.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings and specific examples, so that those skilled in the art can be with
It more fully understands 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 used by suppressing method of power transformer D.C. magnetic biasing is defeated
It is out three-phase, the three-phase transformer group that can be constituted using three single-phase transformers is also possible to a three-phase transformer, by
The six windings composition being wound on common multicolumn iron core, is placed in single cabinet.
Either three-phase transformer group or three-phase transformer, can regard as three first windings and three it is secondary around
Group is formed according to specific connection type respectively, it is preferred that three first windings are connected according to Y type mode, three secondary windings
It is connected according to △ type mode.
The coiling tertiary winding is connected in the tertiary winding as DC compensation winding in the common core of power transformer
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
There are three three windings, adopts and is connected serially；
The obtained DC current values of measurement are sent to DC current source by DC current transformer, and DC current source is according to connecing
The DC current values received export DC current to the tertiary winding；
The current polarity of DC current source output is opposite with the DC current polarity at transformer first winding neutral point.
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 first winding the number of turns,N 3 For the number of turns of the tertiary winding,I 1For power transformer first winding neutral point
The DC current values that place measures,I 3The DC current values exported for DC current source to the tertiary winding.
Further, DC current source is furnished with communication interface, the direct current for measuring 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, increase a tertiary winding as DC compensation around
Group, the DC current source of one current control of series connection access, is measured in DC compensation winding with power transformer neutral point
DC current is control foundation, the DC current for enabling DC current and power transformer neutral point in every phase compensative winding flow through
Polarity is opposite and proportional relationship, thus make the compensation magnetomotive force of every phase compensative winding be equal to the every phase of power transformer primary side around
Direct current magnetomotive force in group can be completely counterbalanced by the straight of transformer primary winding due to contrary in the ideal case
Magnetomotive force is flowed, good D.C. magnetic biasing inhibitory effect is played.
The present embodiment carries out D.C. magnetic biasing inhibition 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.
Installation using the DC magnetic biasing suppression device of the present embodiment method is carried out during transformer manufacturing, with
Other methods are compared, and the DC magnetic biasing suppression device installation difficulty is low, and precision and unfailing performance access preferable guarantee, simultaneously
By optimization design, the DC magnetic biasing suppression device can be made to be integrated on transformer body, save installation space.
The present embodiment will not change the parameter of electric system, and it is existing not influence exterior overvoltage protection, relay protection etc.
Configuration, is preferably minimized the influence degree to power grid security.
Embodiment described above is only to absolutely prove preferred embodiment that is of the invention and being lifted, protection model of the invention
It encloses without being limited thereto.Those skilled in the art's made equivalent substitute or transformation on the basis of the present invention, in the present invention
Protection scope within.Protection scope of the present invention is subject to 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
Transformer is made of three first windings and three secondary windings, characterized in that in being total to for each first winding and secondary winding
It uses and distinguishes one tertiary winding of coiling on iron core as DC compensation winding, there are three the tertiary windings, three tertiary windings
Between adopt and be connected serially, series connection accesses a current control on the series circuit that three tertiary windings are constituted
DC current source, and a DC current transformer is installed at the neutral point of the first winding,
The DC current values that measurement obtains 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 received；
The current polarity of the DC current source output is opposite with the DC current polarity at transformer first winding neutral point.
2. the suppressing method of power transformer D.C. magnetic biasing as described in claim 1, characterized in that the DC current source to
The DC current values of tertiary winding output are obtained by the following formula:
Wherein, N1For first winding the number of turns, N3For the number of turns of the tertiary winding, I1To be surveyed at power transformer first winding neutral point
The DC current values obtained, I3The DC current values exported for DC current source to the tertiary winding.
3. the suppressing method of power transformer D.C. magnetic biasing as claimed in claim 1 or 2, characterized in that the DC current
Source is furnished with communication interface, for by include first winding neutral point at the DC current values that measure, DC current source export
Information including DC current values and the working condition of DC current source is sent to monitoring backstage.
4. the suppressing method of power transformer D.C. magnetic biasing as described in claim 1, 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 described in claim 1, characterized in that the power transformer
Three first windings are connected according to Y type mode, and three secondary windings are connected according to △ type mode.
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| Application Number | Priority Date | Filing Date | Title |
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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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| CN106558406A CN106558406A (en) | 2017-04-05 |
| CN106558406B true CN106558406B (en) | 2019-07-09 |
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Families Citing this family (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 |
| CN110197759A (en) * | 2018-02-26 | 2019-09-03 | 西门子公司 | Transformer, three-phase transformer and its mode of connection |
| CN108400005B (en) * | 2018-04-26 | 2020-12-25 | 湖南大学 | Transformer direct-current magnetic bias suppression system and suppression method |
| 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 |
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 |
-
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 |
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