CN106950441B - A kind of sensor for on-line checking transformer DC magnetic bias - Google Patents
A kind of sensor for on-line checking transformer DC magnetic bias Download PDFInfo
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- CN106950441B CN106950441B CN201710081811.2A CN201710081811A CN106950441B CN 106950441 B CN106950441 B CN 106950441B CN 201710081811 A CN201710081811 A CN 201710081811A CN 106950441 B CN106950441 B CN 106950441B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention discloses a kind of sensors for on-line checking transformer DC magnetic bias, including U-shaped special-shaped magnetic core, it is wound with excitation coil and detection coil respectively on U-shaped abnormal shape magnetic core, detection coil is wound in outside excitation coil, and excitation coil is connected with excitation current source.The sensor combines Fluxgate Technique and devises a special-shaped magnetic core.After inside transformer magnetic field imports sensor, D.C. magnetic field is detected using Fluxgate Technique, detection coil incudes to obtain voltage, and inside transformer direct current flux then can be obtained in isolated DC component, judges whether transformer occurs magnetic biasing by the monitoring to direct current flux.
Description
[technical field]
The invention belongs to power transformer and sensor field, it is related to a kind of for on-line checking transformer DC magnetic bias
Sensor.
[background technique]
When power transformer works, iron core is in remagnetization state and non DC bias phenomenon.However in static reacance
During power compensation and high voltage direct current converter, DC component is easily generated between transformer winding, so as to cause transformer
Magnetic core magnetization center of curve point shifts, i.e. DC magnetic bias phenomena.Waveform Severe distortion, the harmonic wave of exciting current are a large amount of at this time
Generation, noise significantly increases, transformer overheats, and directly affects the normal work of transformer, or even transformer is caused to burn.Cause
This, the D.C. magnetic biasing for detecting transformer core is to guarantee the important measures of transformer health operation.
Currently, electrical measuring method can be used in D.C. magnetic biasing detection, it may be assumed that use electric current at transformer neutral point ground outlet
Mutual inductor sampled signal, directly by DC current at detection neutral point to determine whether there is D.C. magnetic biasing.However this method is not
The bias of single-phase transformer can be detected, and when inhibiting D.C. magnetic biasing using low resistance grounding method, nearby stations can be made
Transformer neutral point direct current increases, and electrical measuring method cannot help operator to make accurate judgement at this time, therefore electrical measuring method is accurate
Property is not high, and has using limitation.
In addition to this, vibration and noise sensor can also be used in D.C. magnetic biasing detection, extracts noise when transformer work
And vibration signal waveforms, under non DC bias transformer noise and vibration signal waveforms compare, with this to determine whether having
The generation of D.C. magnetic biasing.However the working condition of transformer is influenced by factors such as power, environment temperature and service lives.When right
When there is deviation than noise and rumble spectrum, be difficult judgment bias be caused as D.C. magnetic biasing or the factors such as temperature caused by.
[summary of the invention]
It is an object of the invention to overcome the above-mentioned prior art, provide a kind of for on-line checking transformer dc
Whether the sensor of bias, the sensor occur D.C. magnetic biasing when being able to detect transformer work, pass through the straight of detection transformer
Magnetic flux is flowed to detect bias, there is higher sensitivity, and can be realized on-line measurement.
In order to achieve the above objectives, the present invention is achieved by the following scheme:
A kind of sensor for on-line checking transformer DC magnetic bias, including U-shaped special-shaped magnetic core, on U-shaped abnormal shape magnetic core
It is wound with excitation coil and detection coil respectively, detection coil is wound in outside excitation coil, excitation coil and excitation current source
It is connected.
A further improvement of the present invention lies in that:
U-shaped abnormal shape magnetic core is formed by stacking by multilayer cobalt-based band, and through-hole is provided in the middle part of U-shaped magnetic core, through-hole or so two
Side is coil-wound parts；Excitation current source generates the period in the excitation coil for winding of connecting at left and right sides of magnetic core through-hole
Property variation, the excitation field that size is identical, contrary.
Excitation coil series connection is wound in the magnetic core at left and right sides of through-hole.
The winding direction of excitation coil guarantees that when there is exciting current to flow through excitation coil, through-hole surrounding is capable of forming closure
Toroidal magnetic field.
The coil turn that excitation coil is wound in through-hole two sides magnetic core is equal.
Insulation processing is used between detection coil and excitation coil.
Compared with prior art, the invention has the following advantages:
The present invention proposes the on-line checking of transformer iron core magnetic bias will be realized, to judge transformer using Fluxgate Technique
Whether work in bias state.Fluxgate Technique has the advantages that high sensitivity, by the magnetic circuit phase of itself and electrical transformer cores
In conjunction with.The present invention applies to fluxgate sensor principle in transformer bias detection, passes through DC current in observation circuit
Change the working condition to reflect transformer.When transformer is worked normally without the generation of magnetic biasing phenomenon, sensor is put into and is measured, prison
Slowdown monitoring circuit will show no current DC component.When magnetic biasing occurs for transformer, observation circuit will be observed that current dc component increases
The phenomenon that adding.It can effectively prevent that voltage device over-heat inside, noise become larger, energy transfer efficiency reduces as caused by voltage device bias
The problems such as, improve transformer working efficiency and security performance.
[Detailed description of the invention]
Fig. 1 is the operation schematic diagram of magnetic core of transformer alternating current-direct current magnetic flux on-line checking novel sensor of the present invention.
Fig. 2 is the design drawing and pictorial diagram of magnetic core of transformer alternating current-direct current magnetic flux on-line checking novel sensor of the present invention.
Fig. 3 is exciting current in the excitation coil of magnetic core of transformer alternating current-direct current magnetic flux on-line checking novel sensor of the present invention
Waveform diagram.
Wherein: 1-U type abnormal shape magnetic core；2- excitation coil；3- excitation current source；4- detection coil.
[specific embodiment]
The invention will be described in further detail with reference to the accompanying drawing:
Referring to Fig. 1-3, present invention combination fluxgate sensor relative theory is proposed a kind of for on-line checking transformer
The sensor of D.C. magnetic biasing, and can be realized the engine request of on-line checking.The present invention includes U-shaped special-shaped magnetic core 1, U-shaped abnormal shape
Excitation coil 2 and detection coil 4 are wound on magnetic core 1 respectively, detection coil 4 is wound in outside excitation coil 3, excitation coil 2
It is connected with excitation current source 3.It being lost caused by being vortexed in order to prevent, U-shaped abnormal shape magnetic core 1 is formed by stacking by multilayer cobalt-based band,
And through-hole is provided in the middle part of U-shaped magnetic core, it is coil-wound parts at left and right sides of through-hole.The series connection of excitation coil 2 is wound in a through-hole left side
The magnetic core of right two sides, winding direction need to guarantee that when there is exciting current to flow through excitation coil 2, through-hole surrounding is capable of forming close ring
Shape magnetic field, and the coil turn for being wound in through-hole two sides iron core is equal.
Excitation current source 3 of the present invention generates the period in the excitation coil 2 for winding of connecting at left and right sides of magnetic core through-hole
Property variation, the excitation field that size is identical, contrary.Exciting current is the certain pulse of frequency, when exciting current reaches
When peak value, corresponding magnetic core internal magnetic field is up to maximum value, and sensor magnetic core reaches saturation state at this time.
Detection coil 4 is wound in outside excitation coil 3, and needs insulation processing between excitation coil 3.Working sensor
When, according to Faraday's electromagnetic induction law, which will induce electromotive force.It is extracted in circuit using FFT or integral transformation
Voltage DC component can be detected direct current flux.
The configuration of the present invention is simple can improve transformer by examining direct current flux to monitor inside transformer working condition
Working efficiency and security performance.
As shown in Figure 1, the present invention is made of U-shaped special-shaped magnetic core 1, excitation coil 2, excitation current source 3 and measuring coil 4.
The excitation coil series connection of two equal turn numbers is wound in the magnetic core at left and right sides of through-hole, when there is exciting current to pass through, through-hole four
It is capable of forming closed annular magnetic field week.The magnetic field that the excitation field and transformer introduce sensor is overlapped mutually, so that sensor
Reach saturation state.
Inside transformer magnetic field to be measured is divided into D.C. magnetic field and alternating current magnetic field, when sensor is accessed transformer to be measured,
Since sensor magnetic permeability is much higher than transformer, magnetic field is by flow sensor in transformer, if the friendship of flow sensor
Flow component and DC component be divided into and.
Fig. 2 is that U-shaped special-shaped Magnetic Core Design figure and processing pictorial diagram, silicon steel sheet use cobalt-based material, is induction coil, and
Respectively magnet exciting coil, and the two the number of turns is identical.
As shown in figure 3, generating week in the coil and coil of series connection winding at left and right sides of groove under the action of exciting current
The variation of phase property, the excitation field that size is identical, contrary.Exciting current is the certain pulse of frequency, when exciting current reaches
When maximum, the magnetic field in corresponding magnetic core also reaches maximum value, i.e. sensor reaches saturation state.The excitation field enables to
The toroidal magnetic field of variation is formed in sensor monolithic magnetic core.According to Faraday's electromagnetic induction law, measuring coil will be felt at this time
Electromotive force should be gone out.In not only comprising the voltage that is induced by alternating current magnetic field, but also include the DC voltage that D.C. magnetic field induces.
Fast Fourier Transform (FFT) is carried out to gained induced electromotive force or Integral Processing eliminates AC compounent, it can be by direct current
Component extraction goes out.When magnetic biasing occurs for transformer to be measured, obvious transformation will occur for DC component, can be by monitoring DC component
To judge whether transformer occurs bias.
The above content is merely illustrative of the invention's technical idea, and this does not limit the scope of protection of the present invention, all to press
According to technical idea proposed by the present invention, any changes made on the basis of the technical scheme each falls within claims of the present invention
Protection scope within.
Claims (5)
1. a kind of sensor for on-line checking transformer DC magnetic bias, which is characterized in that including U-shaped special-shaped magnetic core (1), U
Excitation coil (2) and detection coil (4) are wound on type abnormal shape magnetic core (1) respectively, detection coil (4) is wound in excitation coil
(3) external, excitation coil (2) is connected with excitation current source (3)；U-shaped abnormal shape magnetic core (1) is formed by stacking by multilayer cobalt-based band,
And through-hole is provided in the middle part of U-shaped magnetic core, it is coil-wound parts at left and right sides of through-hole；Excitation current source (3) is used for logical in magnetic core
Cyclically-varying, the excitation field that size is identical, contrary are generated in the excitation coil (2) of series connection winding at left and right sides of hole.
2. the sensor according to claim 1 for on-line checking transformer DC magnetic bias, which is characterized in that excitation line
Circle (2) series connection is wound in the magnetic core at left and right sides of through-hole.
3. the sensor according to claim 2 for on-line checking transformer DC magnetic bias, which is characterized in that excitation line
The winding direction for enclosing (2) guarantees that when there is exciting current to flow through excitation coil (2), through-hole surrounding is capable of forming closed annular magnetic
?.
4. the sensor according to claim 3 for on-line checking transformer DC magnetic bias, which is characterized in that excitation line
The coil turn that circle (2) is wound in through-hole two sides magnetic core is equal.
5. the sensor according to claim 1 for on-line checking transformer DC magnetic bias, which is characterized in that detection line
It encloses and uses insulation processing between (4) and excitation coil (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710081811.2A CN106950441B (en) | 2017-02-15 | 2017-02-15 | A kind of sensor for on-line checking transformer DC magnetic bias |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710081811.2A CN106950441B (en) | 2017-02-15 | 2017-02-15 | A kind of sensor for on-line checking transformer DC magnetic bias |
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| CN106950441A CN106950441A (en) | 2017-07-14 |
| CN106950441B true CN106950441B (en) | 2019-07-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111965569A (en) * | 2020-07-06 | 2020-11-20 | 南方电网科学研究院有限责任公司 | DC magnetic bias level measurement method, device and system for on-line operation transformer |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108562778A (en) * | 2018-06-21 | 2018-09-21 | 深圳市航智精密电子有限公司 | A kind of open type current sensor and its control method |
| CN109358300B (en) * | 2018-09-29 | 2021-02-05 | 河南理工大学 | Miniature fluxgate sensor based on spatial structure iron core |
| CN110596480A (en) * | 2019-07-09 | 2019-12-20 | 国网江苏省电力有限公司徐州供电分公司 | Excitation signal injection-based transformer direct-current magnetic bias detection system and detection method thereof |
| CN110389250B (en) * | 2019-07-29 | 2021-06-15 | 武汉新电电气股份有限公司 | Device and method for early warning of DC magnetic bias event of transformer |
| CN112327224B (en) * | 2020-11-02 | 2024-02-13 | 国网江苏省电力有限公司电力科学研究院 | Non-closed magnetic circuit magnetic field induction electricity acquisition testing device and method |
| CN114019220B (en) * | 2022-01-07 | 2022-04-12 | 北京芯可鉴科技有限公司 | Current detector and circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| SU971618A1 (en) * | 1981-05-25 | 1982-11-07 | Курский Политехнический Институт | Device for sensing contact of tool with workpiece |
| JP3286446B2 (en) * | 1993-12-29 | 2002-05-27 | 住友特殊金属株式会社 | DC current sensor |
| CN201429587Y (en) * | 2009-06-19 | 2010-03-24 | 长安大学 | Novel sensor for steel rail detection |
| CN203204135U (en) * | 2013-03-28 | 2013-09-18 | 中国船舶重工集团公司第七一〇研究所 | U type single magnetic core magnetic flux gate probe |
| CN104614690B (en) * | 2014-12-18 | 2018-03-02 | 哈尔滨理工大学 | A kind of miniature array fluxgate sensor |
| CN105137370A (en) * | 2015-08-27 | 2015-12-09 | 无锡伊佩克科技有限公司 | Low power consumption miniature fluxgate sensor |
| CN105866239A (en) * | 2016-04-25 | 2016-08-17 | 江南大学 | Detection method for U-shaped pulse fusing sensor based on ferromagnetic test piece |
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| CN111965569A (en) * | 2020-07-06 | 2020-11-20 | 南方电网科学研究院有限责任公司 | DC magnetic bias level measurement method, device and system for on-line operation transformer |
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