CN105865363A - Transformer winding deformation online testing device and method - Google Patents
Transformer winding deformation online testing device and method Download PDFInfo
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- CN105865363A CN105865363A CN201610218872.4A CN201610218872A CN105865363A CN 105865363 A CN105865363 A CN 105865363A CN 201610218872 A CN201610218872 A CN 201610218872A CN 105865363 A CN105865363 A CN 105865363A
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- 238000001514 detection method Methods 0.000 claims abstract description 31
- 239000013307 optical fiber Substances 0.000 claims description 177
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/165—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of a grating deformed by the object
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Abstract
The invention discloses a transformer winding deformation online testing device and method, relates to the technical field of distributed fiber bragg grating sensing, and solves the technical problems that transformer winding deformation cannot be monitored online and power failure testing efficiency is low. The transformer winding deformation online testing device comprises a pulse laser providing unit, at least one reference fiber grating, at least one signal fiber grating and a calculating unit; the transformer winding deformation online testing device also comprises a frequency spectrum detection circuit; the pulse laser providing unit is used for introducing pulse laser; the frequency spectrum detection circuit is used for detecting the frequency spectrums of the reflected laser in the signal fiber bragg grating and the laser in the reference fiber bragg grating; the calculation unit is used for calculating frequency shift and calculating the strain condition of the signal fiber bragg grating according to the frequency shift. The invention is applied to the online monitoring or detection of the deformation of the transformer winding.
Description
Technical field
The present invention relates to distributed fiber grating field of sensing technologies, particularly relate to a kind of deformation of transformer winding
Online testing device and method.
Background technology
Along with the development of national economy, power system is also developing rapidly.Transformator is the core of electric power system
Equipment, the deformation extent of Transformer Winding is to determine the key factor that can transformator continue safe and stable operation,
Therefore, actively develop the test job of the deformation to Transformer Winding, find that winding has the transformation of deformation in time
Device, and in a planned way carry out hanging cover inspection and maintenance, there is extremely important effect.
At present, as follows to the test process of deformation of transformer winding: firstly, it is necessary to transformator power-off, so
After, utilize method of frequency response method or the deformation of reactance method test Transformer Winding.But, present inventor sends out
Existing, in above-mentioned test process, need first transformator power-off to be tested again, not only can reduce power supply system
The reliability of system power supply, also can make testing efficiency relatively low.
Summary of the invention
It is an object of the invention to provide a kind of deformation of transformer winding online testing device and method, be used for solving
Certainly deformation of transformer winding cannot on-line monitoring, the technical problem that power failure testing efficiency is relatively low.
For reaching above-mentioned purpose, the present invention provides a kind of deformation of transformer winding online testing device, uses such as
Lower technical scheme:
This deformation of transformer winding online testing device includes that pulse laser provides unit, at least one reference light
Fine grating, at least one signal optical fibre grating and computing unit；Described deformation of transformer winding on-line testing fills
Put and also include frequency spectrum detection circuit；
Wherein, described signal optical fibre grating is fixed on winding to be measured, so that described signal optical fibre grating can be with
The deformation of described winding to be measured and deform, at the beginning of described reference optical fiber grating and described signal optical fibre grating
Identical and local environment the temperature of beginning shape is identical, described pulse laser provide unit respectively with described reference light
Fine grating and described signal optical fibre grating connect, described frequency spectrum detection circuit respectively with described reference optical fiber grating
Connecting with described signal optical fibre grating, described computing unit is connected with described frequency spectrum detection circuit；
Described pulse laser provides unit for logical in described signal optical fibre grating and described reference optical fiber grating
Enter the pulse laser that light intensity is identical；Described frequency spectrum detection circuit is anti-for detect in described signal optical fibre grating
Penetrate the frequency spectrum of laser in the frequency spectrum of laser and described reference optical fiber grating；Described computing unit is used for calculating institute
State the frequency displacement relative to the laser in described reference optical fiber grating of the reflection laser in signal optical fibre grating, described
Frequency displacement is that the center spectrum of the reflection laser in described signal optical fibre grating is relative in described reference optical fiber grating
The amount of movement of center spectrum of laser, and calculate the strain feelings of described signal optical fibre grating according to described frequency displacement
Condition.
The deformation of transformer winding online testing device that the present invention provides has structure as above, is using
During above-mentioned deformation of transformer winding online testing device test deformation of transformer winding, it is only necessary to first
Unit is provided to be passed through, in signal optical fibre grating with reference optical fiber grating, the pulse that light intensity is identical by pulse laser
Laser, pulse laser can reflect in signal optical fibre grating, advances, then in reference optical fiber grating
By the frequency spectrum of the reflection laser in frequency spectrum detection electric circuit inspection signal optical fibre grating, and reference optical fiber grating
In the frequency spectrum of laser, finally by the reflection laser in computing unit signal calculated fiber grating relative to ginseng
Examine the frequency displacement of laser in fiber grating, and according to the strained situation of frequency displacement signal calculated fiber grating.Therefore,
In above process, it is not necessary to first transformator is had a power failure and test again, and then can solve the problem that Transformer Winding becomes
Shape cannot on-line monitoring, the technical problem that power failure testing efficiency is relatively low.
Further, the present invention also provides for a kind of deformation of transformer winding on-line testing method, uses following skill
Art scheme:
This deformation of transformer winding on-line testing method includes:
Unit is provided to lead in described signal optical fibre grating and described reference optical fiber grating by described pulse laser
Enter the pulse laser that light intensity is identical；
By the frequency spectrum of the reflection laser in signal optical fibre grating described in described frequency spectrum detection electric circuit inspection, and
The frequency spectrum of the laser in described reference optical fiber grating；
The reflection laser in described signal optical fibre grating is calculated relative to described reference light by described computing unit
The frequency displacement of the laser in fine grating, described frequency displacement is the center frequency of the reflection laser in described signal optical fibre grating
Compose the amount of movement of the center spectrum relative to the laser in described reference optical fiber grating, and according to described frequency displacement meter
Calculate the strained situation of described signal optical fibre grating.
The deformation of transformer winding on-line testing method that the embodiment of the present invention provides includes step as above,
During using above-mentioned deformation of transformer winding on-line testing method test deformation of transformer winding, only need
It is identical that pulse laser to be first passed through provides unit to be passed through light intensity in signal optical fibre grating with reference optical fiber grating
Pulse laser, pulse laser can reflect in signal optical fibre grating, in reference optical fiber grating advance,
Then by the frequency spectrum of the reflection laser in frequency spectrum detection electric circuit inspection signal optical fibre grating, and reference optical fiber
The frequency spectrum of the laser in grating is relative finally by the reflection laser in computing unit signal calculated fiber grating
The frequency displacement of the laser in reference optical fiber grating, and according to the strained situation of frequency displacement signal calculated fiber grating.
Therefore, in above process, it is not necessary to first transformator is had a power failure and test again, and then can solve the problem that transformator
Winding deformation cannot on-line monitoring, the technical problem that power failure testing efficiency is relatively low.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to enforcement
In example description, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only
It is only some embodiments of the present invention, for those of ordinary skill in the art, is not paying creative labor
On the premise of Dong, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structure chart of the deformation of transformer winding online testing device in the embodiment of the present invention；
Fig. 2 provides the structure chart of unit for the pulse laser in the embodiment of the present invention；
Fig. 3 is the schematic diagram of the fiber grating interface board in the embodiment of the present invention；
Fig. 4 is the schematic diagram one of the fixed form of the signal optical fibre grating in the embodiment of the present invention；
Fig. 5 is the schematic diagram two of the fixed form of the signal optical fibre grating in the embodiment of the present invention；
Fig. 6 is the schematic diagram three of the fixed form of the signal optical fibre grating in the embodiment of the present invention；
Fig. 7 is the schematic diagram four of the fixed form of the signal optical fibre grating in the embodiment of the present invention.
Description of reference numerals:
1 pulse laser provides unit；11 pulsed laser sources；12 distribution type fiber-optics；
13 3dB fiber couplers；2 reference optical fiber gratings；3 signal optical fibre gratings；
4 computing units；5 frequency spectrum detection circuit；6 signal amplification circuits；
7 filtering sampling circuit；8 display；9 windings to be measured.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly
Chu, it is fully described by, it is clear that described embodiment is a part of embodiment of the present invention rather than all
Embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creative labor
The every other embodiment obtained under dynamic premise, broadly falls into the scope of protection of the invention.
Embodiment one
The embodiment of the present invention provides a kind of deformation of transformer winding online testing device, as it is shown in figure 1, this change
Deformation of transformer winding online testing device include pulse laser provide unit 1, at least one reference optical fiber grating 2,
At least one signal optical fibre grating 3 and computing unit 4；This deformation of transformer winding online testing device also includes
Frequency spectrum detection circuit 5.
The concrete connected mode of above-mentioned each structure is as follows: signal optical fibre grating 3 is fixed on winding to be measured, with
Make signal optical fibre grating 3 can deform with the deformation of winding to be measured, reference optical fiber grating 2 and flashlight
Identical and local environment the temperature of original shape of fine grating 3 is identical, pulse laser provide unit 1 respectively with
Reference optical fiber grating 2 and signal optical fibre grating 3 connect, frequency spectrum detection circuit 5 respectively with reference optical fiber grating 2
Connecting with signal optical fibre grating 3, computing unit 4 is connected with frequency spectrum detection circuit 5.
The function with as above each structure of connected mode is as follows: pulse laser provides unit 1 for signal
Fiber grating 3 is passed through, with in reference optical fiber grating 2, the pulse laser that light intensity is identical；Frequency spectrum detection circuit 5 is used
The frequency spectrum of the laser in the frequency spectrum of the reflection laser in detection signal optical fibre grating 3 and reference optical fiber grating 2；
The computing unit 4 reflection laser in signal calculated fiber grating 3 is relative in reference optical fiber grating 2
The frequency displacement of laser, this frequency displacement is that the center spectrum of the reflection laser in signal optical fibre grating 3 is relative to reference light
The amount of movement of the center spectrum of the laser in fine grating 2, and according to this frequency displacement signal calculated fiber grating 3
Strained situation.
The deformation of transformer winding online testing device that the embodiment of the present invention provides has structure as above,
During using above-mentioned deformation of transformer winding online testing device test deformation of transformer winding, only need
Pulse laser to be first passed through provides unit 1 to be passed through light in signal optical fibre grating 3 and reference optical fiber grating 2
The most identical pulse laser, pulse laser can reflect in signal optical fibre grating 3, at reference optical fiber light
Grid 2 advance, is then detected the frequency reflecting laser in signal optical fibre grating 3 by frequency spectrum detection circuit 4
Spectrum, and the frequency spectrum of the laser in reference optical fiber grating 2, finally by computing unit signal calculated optical fiber light
Reflection laser in grid 3 is relative to the frequency displacement of the laser in reference optical fiber grating 2, and calculates letter according to frequency displacement
The strained situation of number fiber grating 3.Therefore, in above process, it is not necessary to first transformator is had a power failure and carry out again
Test, so can solve the problem that deformation of transformer winding cannot on-line monitoring, the technology that power failure testing efficiency is relatively low
Problem.
Specifically, frequency displacement Δ λBAnd the relation between the strained situation of signal optical fibre grating 3 meets below equation:
Wherein, Δ λBFor frequency displacement, λBFor the center spectrum of the laser in reference optical fiber grating 2, ε1For flashlight
The axial strain of fine grating 3, ε2, ε3It is respectively the pairwise orthogonal transverse strain of signal optical fibre grating 3, α1, αt
Being respectively the thermal coefficient of expansion longitudinally, laterally of signal optical fibre grating 3, ξ is the hot light of signal optical fibre grating 3
Coefficient, Pij is the bullet light component of tensor (i, j=1,2,3) of signal optical fibre grating 3, neffFor signal optical fibre grating 3
Effective refractive index, Δ T is the signal optical fibre grating 3 variations in temperature relative to reference optical fiber grating 2.
Owing to signal optical fibre grating 3 is identical with the temperature of reference optical fiber grating 2, therefore, above-mentioned Δ T is 0,
Now, above-mentioned formula can be reduced to:
Understanding in view of the foregoing, no matter any one position of signal optical fibre grating 3 deforms, and uses
Deformation of transformer winding online testing device in the embodiment of the present invention all can be tested, and then makes this
The applied range of the deformation of transformer winding online testing device in inventive embodiments.
Alternatively, as in figure 2 it is shown, the pulse laser offer unit 1 in the embodiment of the present invention includes that pulse swashs
Light source 11, distribution type fiber-optic 12,3dB fiber coupler 13, wherein, pulsed laser source 11 is with distributed
First end of optical fiber 12 connects, the input letter of the second end of distribution type fiber-optic 12 and 3dB fiber coupler 13
Road connects, two of 3dB fiber coupler 13 output channels respectively with signal optical fibre grating 3 and reference optical fiber
Grating 2 connects.The process that the pulse laser with said structure provides unit to provide pulse laser is as follows: arteries and veins
Laser light source 11 sends a bundle of pulsed laser, and pulse laser transmits to 3dB optical fiber coupling through distribution type fiber-optic 12
Clutch 13, pulse laser is coupled into the pulse laser that two-beam is the most identical by 3dB fiber coupler 13, to divide
You can well imagine supply signal optical fibre grating 3 and reference optical fiber grating 2.Certainly, pulse laser provides the concrete of unit 1
Structure is not limited to this, and those skilled in the art can select according to actual needs.
It addition, as it is shown in figure 1, deformation of transformer winding online testing device also includes signal amplification circuit 6
With filtering sampling circuit 7, frequency spectrum detection circuit 5, signal amplification circuit 6, filtering sampling circuit 7 and calculating
Unit 4 is sequentially connected with, and then can be amplified, by signal amplification circuit 6, the spectrum signal detected
Process, by filtering sampling circuit 7, the spectrum signal after amplifying is filtered sampling processing, and then makes
The strained situation of the signal optical fibre grating 3 that computing unit 4 calculates is more accurate.
Alternatively, the deformation of transformer winding online testing device in the embodiment of the present invention can also include display
Device 8, the input of display 8 is connected with the outfan of computing unit 4, is used for showing signal optical fibre grating 3
Strained situation.Wherein, the mode of being particularly shown can be the various ways such as numeral, figure, does not carries out
Limit.
Alternatively, the deformation of transformer winding online testing device in the embodiment of the present invention also includes the light of circle
Fine raster interface plate, as it is shown on figure 3, this fiber grating interface board periphery is provided with multiple fastening screw hole,
Being provided centrally with multiple fiber grating docking port, fastening screw hole is for being fixed on change by fiber grating interface board
Outside depressor, fiber grating docking port is for leading to transformation by all signal optical fibre gratings 3 in transformator
Outside device.Owing to one fiber grating interface board of use just can be by all signal optical fibre gratings 3 in transformator
Lead to outside transformator, therefore, it can avoid transformer oil seepage to the full extent, maintain transformator
Normal work.
Alternatively, the signal optical fibre grating 3 in the embodiment of the present invention should have critical strain ε0, signal optical fibre
The strain stress of grating 3 is more than critical strain ε0Time, signal optical fibre grating 3 ruptures, this critical strain with to be measured around
The marginal value of the deformation of group is corresponding, therefore, receives once frequency spectrum detection circuit 5 no signal, then illustrates
Signal optical fibre grating 3 ruptures, and the deformation further relating to winding to be measured is more than its marginal value, and then can be timely
Exactly winding to be measured is hung cover inspection and maintenance.
For the ease of those skilled in the art implement, below the embodiment of the present invention provide several signal optical fibre gratings 3
Concrete fixed form on winding to be measured: the first, as shown in Figure 4, at least one signal optical fibre grating 3
Circumferentially equidistant along winding 9 to be measured is fixed on winding 9 to be measured, when using this fixed form, transformator around
Group deformation online testing device can be used for testing winding 9 to be measured deformation in the radial direction thereof；The second, such as Fig. 5
Shown in, at least one signal optical fibre grating 3 is axial along winding 9 to be measured, is equidistantly fixed on winding 9 to be measured
On, when using this fixed form, deformation of transformer winding online testing device can be used for testing winding 9 to be measured
Deformation in its axial direction；The third, as shown in Figure 6, at least one signal optical fibre grating 3 is fixed on to be treated
Survey on the leading-out terminal of winding 9, form a triangular structure, when using this fixed form, Transformer Winding
Deformation online testing device can be used for testing the deformation of the leading-out terminal of winding 9 to be measured；4th kind, such as Fig. 7 institute
Show, a part at least one signal optical fibre grating 3 between adjacent two windings 9 to be measured, another portion
Dividing and be fixed on adjacent two windings 9 to be measured, when using this fixed form, deformation of transformer winding is surveyed online
The situations such as displacement, the deformation that electricity testing device can be used for testing between adjacent winding to be measured 9.It should be noted that
Those skilled in the art, can according to actual needs during implementing, in above four kinds of fixed forms
Optionally at least one, this is not defined by the embodiment of the present invention.
Specifically, for electric pressure be 110kV, capacity be four coil transformers of 40MVA, this change
The coils arrangement mode of depressor is respectively low pressure, pressure regulation, middle pressure, high pressure from inside to outside.At test winding
During radial deformation, signal optical fibre grating 3 can be fixed on the low-pressure side winding of every phase, by low-pressure side around
Group is divided into 5 sections vertically, selects equally distributed 6 fixing points in the first coil of each section, and will
Signal optical fibre grating 3 is fixed on each fixing point；When testing the axial deformation of winding, can be by a plurality of letter
Number fiber grating 3 is separately fixed in the low pressure of every phase, pressure regulation, middle pressure, four windings of high pressure, such as,
Fixing two bars fiber gratings 3 on each winding, the line of above-mentioned two bars fiber gratings is this winding
Diameter, every bars fiber grating 3 is all fixed on each winding by equally distributed 5 fixing points；?
During the deformation of leading-out terminal of test winding, signal optical fibre grating 3 can be fixed on the low-pressure side winding of every phase
Leading-out terminal, make signal optical fibre grating 3 triangular in shape；When the displacement tested between adjacent winding, deformation etc.
During situation, a part for signal optical fibre grating 3 can be carried out admittedly along the axial of each winding with 5 fixing points
Fixed, and make another part of signal optical fibre grating 3 between adjacent winding.
Embodiment two
The embodiment of the present invention provides a kind of deformation of transformer winding on-line testing method, this deformation of transformer winding
On-line testing method uses the deformation of transformer winding online testing device test that in embodiment one, any one is described
Deformation of transformer winding, specifically, this deformation of transformer winding on-line testing method includes:
Step 1, by pulse laser provide unit in signal optical fibre grating and reference optical fiber grating, be passed through light intensity
Identical pulse laser.
Step 2, by frequency spectrum detection electric circuit inspection signal optical fibre grating reflection laser frequency spectrum, Yi Jican
Examine the frequency spectrum of laser in fiber grating.
Step 3, by the reflection laser in computing unit signal calculated fiber grating relative to reference optical fiber grating
In the frequency displacement of laser, and according to the strained situation of frequency displacement signal calculated fiber grating.Wherein, frequency displacement is letter
The center spectrum of the reflection laser in number fiber grating is relative to the center spectrum of the laser in reference optical fiber grating
Amount of movement.
The deformation of transformer winding on-line testing method that the embodiment of the present invention provides includes step as above,
During using above-mentioned deformation of transformer winding on-line testing method test deformation of transformer winding, only need
It is identical that pulse laser to be first passed through provides unit to be passed through light intensity in signal optical fibre grating with reference optical fiber grating
Pulse laser, pulse laser can reflect in signal optical fibre grating, in reference optical fiber grating advance,
Then by the frequency spectrum of the reflection laser in frequency spectrum detection electric circuit inspection signal optical fibre grating, and reference optical fiber
The frequency spectrum of the laser in grating is relative finally by the reflection laser in computing unit signal calculated fiber grating
The frequency displacement of the laser in reference optical fiber grating, and according to the strained situation of frequency displacement signal calculated fiber grating.
Therefore, in above process, it is not necessary to first transformator is had a power failure and test again, and then can solve the problem that transformator
Winding deformation cannot on-line monitoring, the technical problem that power failure testing efficiency is relatively low.
Exemplarily, when, as described in embodiment one, pulse laser provides unit to include pulsed laser source, divide
When cloth optical fiber, 3dB fiber coupler, provide unit to signal optical fibre grating and ginseng above by pulse laser
Examine and fiber grating is passed through the step of the identical pulse laser of light intensity specifically includes: by pulsed laser source to point
Cloth fiber grating is passed through pulse laser；By distribution type fiber-optic, pulse laser transmission is coupled to 3dB optical fiber
The input channel of device；Two pulses pulse laser being coupled as light intensity identical by 3dB fiber coupler swashs
Light, and provide respectively to signal optical fibre grating and reference optical fiber grating.
Exemplarily, when, as described in embodiment one, deformation of transformer winding online testing device also signal is put
When big circuit and filtering sampling circuit, swashed by the reflection in frequency spectrum detection electric circuit inspection signal optical fibre grating
After the frequency spectrum of the laser in the frequency spectrum of light, and reference optical fiber grating, deformation of transformer winding on-line testing
Method also includes: be amplified processing to the spectrum signal detected by signal amplification circuit；By filtering
Sample circuit is filtered sampling processing to the spectrum signal after amplifying；According to frequency displacement signal calculated fiber grating
The step of strained situation include: the spectrum signal signal calculated fiber grating after processing according to filtering sampling
Strained situation.Now, the strained situation of the signal optical fibre grating calculating gained is more accurate.
Exemplarily, when, as described in embodiment one, deformation of transformer winding online testing device also includes showing
When showing device, after the strained situation according to frequency displacement signal calculated fiber grating, deformation of transformer winding is online
Method of testing also includes: by the strained situation of display display signal optical fibre grating.
The above, the only detailed description of the invention of the present invention, but protection scope of the present invention is not limited to
This, any those familiar with the art, in the technical scope that the invention discloses, can readily occur in
Change or replacement, all should contain within protection scope of the present invention.Therefore, protection scope of the present invention should
It is as the criterion with described scope of the claims.
Claims (12)
1. a deformation of transformer winding online testing device, it is characterised in that include that pulse laser provides single
Unit, at least one reference optical fiber grating, at least one signal optical fibre grating and computing unit；Described transformator
Winding deformation online testing device also includes frequency spectrum detection circuit；
Wherein, described signal optical fibre grating is fixed on winding to be measured, so that described signal optical fibre grating can be with
The deformation of described winding to be measured and deform, at the beginning of described reference optical fiber grating and described signal optical fibre grating
Identical and local environment the temperature of beginning shape is identical, described pulse laser provide unit respectively with described reference light
Fine grating and described signal optical fibre grating connect, described frequency spectrum detection circuit respectively with described reference optical fiber grating
Connecting with described signal optical fibre grating, described computing unit is connected with described frequency spectrum detection circuit；
Described pulse laser provides unit for logical in described signal optical fibre grating and described reference optical fiber grating
Enter the pulse laser that light intensity is identical；Described frequency spectrum detection circuit is anti-for detect in described signal optical fibre grating
Penetrate the frequency spectrum of laser in the frequency spectrum of laser and described reference optical fiber grating；Described computing unit is used for calculating institute
State the frequency displacement relative to the laser in described reference optical fiber grating of the reflection laser in signal optical fibre grating, described
Frequency displacement is that the center spectrum of the reflection laser in described signal optical fibre grating is relative in described reference optical fiber grating
The amount of movement of center spectrum of laser, and calculate the strain feelings of described signal optical fibre grating according to described frequency displacement
Condition.
Deformation of transformer winding online testing device the most according to claim 1, it is characterised in that institute
State frequency displacement Δ λBAnd the relation between the strained situation of described signal optical fibre grating meets below equation:
Wherein, Δ λBFor frequency displacement, λBFor the center spectrum of the laser in described reference optical fiber grating, ε1For described
The axial strain of signal optical fibre grating, ε2, ε3It is respectively the pairwise orthogonal transverse strain of described signal optical fibre grating,
α1, αtBeing respectively the thermal coefficient of expansion longitudinally, laterally of described signal optical fibre grating, ξ is described signal optical fibre
The thermo-optical coeffecient of grating, Pij is the bullet light component of tensor (i, j=1,2,3) of described signal optical fibre grating, neffFor
The effective refractive index of described signal optical fibre grating.
Deformation of transformer winding online testing device the most according to claim 1, it is characterised in that institute
Stating pulse laser provides unit to include pulsed laser source, distribution type fiber-optic, 3dB fiber coupler, wherein, institute
State pulsed laser source to be connected with the first end of described distribution type fiber-optic, the second end of described distribution type fiber-optic and institute
The input channel stating 3dB fiber coupler connects, and two output channels of described 3dB fiber coupler are respectively
It is connected with described signal optical fibre grating and described reference optical fiber grating.
4. according to the deformation of transformer winding online testing device described in any one of claims 1 to 3, its feature
Be, when described deformation of transformer winding online testing device includes frequency spectrum detection circuit, described transformator around
Group deformation online testing device also includes signal amplification circuit and filtering sampling circuit, described frequency spectrum detection circuit,
Described signal amplification circuit, described filtering sampling circuit and described computing unit are sequentially connected with.
Deformation of transformer winding online testing device the most according to claim 1, it is characterised in that also
Including display, the input of described display is connected with described computing unit, is used for showing described flashlight
The strained situation of fine grating.
Deformation of transformer winding online testing device the most according to claim 1, it is characterised in that also
Including circular fiber grating interface board, described fiber grating interface board periphery is provided with multiple fastening screw hole,
Being provided centrally with multiple fiber grating docking port, described fastening screw hole is for by described fiber grating interface board
Being fixed on outside transformator, described fiber grating docking port is for by all described signal in described transformator
Fiber grating leads to outside described transformator.
Deformation of transformer winding online testing device the most according to claim 1, it is characterised in that institute
State signal optical fibre grating and there is critical strain, when the strain of described signal optical fibre grating is more than described critical strain,
Described signal optical fibre grating ruptures, and described critical strain is corresponding with the marginal value of the deformation of described winding to be measured.
Deformation of transformer winding online testing device the most according to claim 1, it is characterised in that extremely
A few described signal optical fibre grating is fixed on described winding to be measured along the circumferentially equidistant of described winding to be measured,
And/or, signal optical fibre grating described at least one is axial along described winding to be measured, be equidistantly fixed on described in treat
Survey on winding, and/or, signal optical fibre grating described at least one is fixed on the leading-out terminal of described winding to be measured,
Form a triangular structure, and/or, described at least one, a part for signal optical fibre grating is positioned at adjacent two
Between individual described winding to be measured, another part is fixed on adjacent two described windings to be measured.
9. a deformation of transformer winding on-line testing method, it is characterised in that use such as claim 1～8
Deformation of transformer winding online testing device test deformation of transformer winding described in any one, described transformator
Winding deformation on-line testing method includes:
Unit is provided to lead in described signal optical fibre grating and described reference optical fiber grating by described pulse laser
Enter the pulse laser that light intensity is identical；
By the frequency spectrum of the reflection laser in signal optical fibre grating described in described frequency spectrum detection electric circuit inspection, and
The frequency spectrum of the laser in described reference optical fiber grating；
The reflection laser in described signal optical fibre grating is calculated relative to described reference light by described computing unit
The frequency displacement of the laser in fine grating, described frequency displacement is the center frequency of the reflection laser in described signal optical fibre grating
Compose the amount of movement of the center spectrum relative to the laser in described reference optical fiber grating, and according to described frequency displacement meter
Calculate the strained situation of described signal optical fibre grating.
Deformation of transformer winding on-line testing method the most according to claim 9, it is characterised in that
When described pulse laser provides unit to include pulsed laser source, distribution type fiber-optic, 3dB fiber coupler, pass through
Described pulse laser provides unit to be passed through light intensity phase in described signal optical fibre grating and described reference optical fiber grating
The step of same pulse laser specifically includes:
It is passed through pulse laser to described distribution type fiber-optic by described pulsed laser source；
Described distribution type fiber-optic is by the input channel of described pulse laser transmission to described 3dB fiber coupler；
Described pulse laser is coupled as the two bundle of pulsed laser that light intensity is identical by described 3dB fiber coupler, and
There is provided respectively to described signal optical fibre grating and described reference optical fiber grating.
11. according to the deformation of transformer winding on-line testing method described in claim 9 or 10, and its feature exists
In, described deformation of transformer winding online testing device includes frequency spectrum detection circuit, signal amplification circuit and filter
During ripple sample circuit, by the reflection laser in signal optical fibre grating described in described frequency spectrum detection electric circuit inspection
Frequency spectrum, and after the frequency spectrum in described reference optical fiber grating, described deformation of transformer winding on-line testing
Method also includes:
It is amplified processing to the spectrum signal detected by described signal amplification circuit；
By described filtering sampling circuit, the spectrum signal after amplifying is filtered sampling processing；
The step of the strain according to the described frequency displacement described signal optical fibre grating of calculating includes:
Described spectrum signal after processing according to filtering sampling calculates the strained situation of described signal optical fibre grating.
12. deformation of transformer winding on-line testing methods according to claim 9, it is characterised in that
When described deformation of transformer winding online testing device also includes display, described calculating according to described frequency displacement
After the strained situation of signal optical fibre grating, described deformation of transformer winding on-line testing method also includes: logical
Cross described display and show the strained situation of described signal optical fibre grating.
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