CN110412436A - Bushing shell for transformer dielectric loss frequency spectrum detection device based on photoelectric voltage measurement - Google Patents
Bushing shell for transformer dielectric loss frequency spectrum detection device based on photoelectric voltage measurement Download PDFInfo
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- CN110412436A CN110412436A CN201910666243.1A CN201910666243A CN110412436A CN 110412436 A CN110412436 A CN 110412436A CN 201910666243 A CN201910666243 A CN 201910666243A CN 110412436 A CN110412436 A CN 110412436A
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- frequency
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- frequency spectrum
- signal
- detection device
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- 238000001228 spectrum Methods 0.000 title claims abstract description 27
- 238000001514 detection method Methods 0.000 title claims abstract description 26
- 238000005259 measurement Methods 0.000 title claims abstract description 26
- 239000013078 crystal Substances 0.000 claims abstract description 33
- 239000013307 optical fiber Substances 0.000 claims abstract description 24
- 238000009413 insulation Methods 0.000 claims abstract description 15
- 238000012545 processing Methods 0.000 claims abstract description 12
- 230000010287 polarization Effects 0.000 claims description 23
- 230000003287 optical effect Effects 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 238000012546 transfer Methods 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 239000010955 niobium Substances 0.000 description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/181—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using coils without a magnetic core, e.g. Rogowski coils
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
- G01R15/241—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using electro-optical modulators, e.g. electro-absorption
- G01R15/242—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using electro-optical modulators, e.g. electro-absorption based on the Pockels effect, i.e. linear electro-optic effect
-
- 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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
-
- 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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
Bushing shell for transformer dielectric loss frequency spectrum detection device based on photoelectric voltage measurement, it is related to substation's technical field, it solves the problems, such as existing to introduce added losses angle during measuring insulating sleeve dielectric loss frequency spectrum based on condenser type or resistance-capacitance type voltage transformer and be difficult to eliminate electromagnetic interference, frequency of signal generator is connect with parallel electrode plate and tested casing major insulation connecting terminal simultaneously, laser is connected by collimator of PMF A with electro-optic crystal component, electro-optic crystal component and parallel electrode plate are to connection, photodetector is connected with inclined optical fiber collimator B, Rogowski coil and the ground line connection of tested insulating sleeve, current collection circuit is connect with Rogowski coil and double-channel analog/digital converter simultaneously, double-channel analog/digital converter is connect with photodetector and central processing unit simultaneously, central processing unit and frequency of signal generator connect It connects, increases substantially the precision and anti-interference ability of insulating sleeve frequency spectrum detection.
Description
Technical field
The present invention relates to substation's technical fields, and in particular to a kind of bushing shell for transformer Jie based on photoelectric voltage measurement
Damage frequency spectrum detection device.
Background technique
Transformer high-voltage bushing is a kind of important component in transformer.Dielectric loss frequency spectrum is that reaction condenser bushing is exhausted
The key property parameter of edge situation, carrying out dielectric loss on-line monitoring to condenser bushing can the timely and effective insulation for finding casing
The structure problem, prevents interruption of service.
The conventional voltage transformer as used in dielectric loss detection belongs to condenser type or resistance-capacitance type voltage transformer, In
Biggish inductance capacitance can be introduced in measurement process, and measurement result can be made very large deviation occur when serious.Conventional voltage mutual inductance
The frequency characteristic of device shows additional phase delay or advanced in the higher or lower Shi Douhui of frequency.
Since there are serious electromagnetic interference, dielectric loss detections to belong to the detection of high voltage micro-current again in substation, no
By be signal induction during or transmission process in, all inevitably influenced by electromagnetic interference, cause measurement result inaccurate
Really.
Summary of the invention
The present invention is to solve existing condenser type or the resistance-capacitance type voltage transformer of being based in measurement insulating sleeve dielectric loss frequency
Added losses angle is introduced during spectrum and is difficult to the problem of eliminating electromagnetic interference, is provided a kind of based on photoelectric voltage measurement
Bushing shell for transformer dielectric loss frequency spectrum detection device.
Based on the bushing shell for transformer dielectric loss frequency spectrum detection device of photoelectric voltage measurement, including it is frequency of signal generator, flat
Row electrode plate to, laser, polarization maintaining optical fiber collimator A, electro-optic crystal component, polarization maintaining optical fiber collimator B, photodetector, sieve
Family name's coil, current collection circuit, double-channel analog/digital converter and central processing unit；
The frequency of signal generator successively issues the sine voltage signal simultaneous transmission of different frequency to parallel electrode plate
To with tested casing connecting terminal；
The laser signal that the laser issues is transmitted to electro-optic crystal component by polarization maintaining optical fiber collimator A；
The luminescent crystal component is placed on the parallel electrode plate to inside, and the parallel electrode plate is believed by the frequency
The sine voltage signal that number generator generates is transmitted to electro-optic crystal component, and the electro-optic crystal component is by received sinusoidal voltage
Signal is converted to the optical signal of frequency and amplitude synchronism output；The optical signal is transmitted to light institute by polarization maintaining optical fiber collimator B
Photodetector is stated, the photodetector converts optical signals to the linearly related and identical voltage signal of frequency and is transmitted to
The double-channel analog/digital converter；
The Rogowski coil and tested insulating sleeve ground line connect, for measuring tested insulating sleeve to earth-current, institute
The current signal transfer linearity correlation that current collection circuit exports the Rogowski coil and the identical voltage signal of frequency are stated, and
It is sent to the double-channel analog/digital converter；
The central processing unit acquires the sine voltage signal in two channels of double-channel analog/digital converter in real time, and right
Than the relative phase delay of two-way voltage signal, the major insulation dielectric loss of bushing shell for transformer is obtained in 0.01Hz-100kHz model
Enclose interior numeric distribution.
Beneficial effects of the present invention: the bushing shell for transformer dielectric loss frequency spectrum inspection of the present invention based on photoelectric voltage measurement
Device is surveyed, during insulating sleeve dielectric loss measurement, equipment will be acquired when voltage signal acquisition and introduces inductance capacitance reduction
To less than it is equal to 2pF, improve the precision of dielectric loss measurement.On the other hand, voltage detection signal is transmitted using optical fiber, can disappeared
Except the influence of electromagnetic interference in transmission path.
Detailed description of the invention
Fig. 1 is the bushing shell for transformer dielectric loss frequency spectrum detection device of the present invention based on optical voltage transformer
Structural schematic diagram；
Fig. 2 is in the bushing shell for transformer dielectric loss frequency spectrum detection device of the present invention based on optical voltage transformer
The structural schematic diagram of electro-optic crystal component.
Specific embodiment
Specific embodiment one illustrates present embodiment in conjunction with Fig. 1 and Fig. 2, the transformer based on optical voltage transformer
Casing dielectric loss frequency spectrum detection device, including frequency of signal generator 1, electro-optic crystal component 2, laser 3, photodetector
4, parallel electrode plate is quasi- to 5, Rogowski coil 6, current collection circuit 7, double-channel analog/digital converter 8, collimator of PMF A9, polarization-maintaining
Straight device B10, central processing unit 11 and communication equipment 12.
The frequency of signal generator 1 and parallel electrode plate connect 5 and tested casing major insulation connecting terminal simultaneously,
The laser 3 is connected by collimator of PMF A 9 and electro-optic crystal component 2, the electro-optic crystal component 2 and parallel electrode plate
It is connected to 5, the photodetector 4 and inclined optical fiber collimator B 10 connection, the Rogowski coil 6 and tested insulating sleeve ground connection
Line connection connects earth-current, the current collection circuit 7 and Rogowski coil 6 for measuring tested insulating sleeve, the bilateral
Road analog-digital converter 8 and photodetector 4 and connection current collection circuit connection, the central processing unit 11 and binary channels
Analog-digital converter 8 and frequency of signal generator 1 connect,
1 output frequency signal of frequency of signal generator is sinusoidal signal, and the voltage effective value of generation is in 50V to 100V
Between, operating frequency range, between 1kHz, is successively issuing different frequency just with the frequency of fixed intervals multiple in 0.01Hz
String voltage signal and to parallel electrode plate to 5 and tested casing connecting terminal simultaneous transmission, the electro-optic crystal component 2 is placed on flat
To inside 5, the parallel electrode plate is connected to 5 with tested casing major insulation body connecting terminal row electrode plate, for major insulation
Bulk voltage signal is introduced into 2 both ends of electro-optic crystal component, and the laser 3 is partly led using butterfly with the DFB type that refrigerator encapsulates
Body laser, laser 3 issue power stability, and the stable laser signal of degree of polarization is believed light by polarization maintaining optical fiber collimator A9
It number is transmitted in 2 electro-optic crystal components.
Parallel electrode plate is converted to linearly related and synchronous light intensity to 5 voltage signal by the electro-optic crystal component 2
It spends signal and photodetector 4 is sent to by collimator of PMF B10, the electric explorer 4 converts optical signals to linear phase
Pass and synchronous voltage signal are simultaneously sent to the double-channel analog/digital converter 8；It, can by the voltage signal of optical fiber transmission measurement
Electromagnetic interference is introduced in transmission link to avoid in voltage measurement signal.
The Rogowski coil 6 be used for measure tested casing major insulation part to earth-current；The current collection circuit 7 will
The current signal that the Rogowski coil 6 exports is converted to linearly related synchronous voltage signal, and turns to the double-channel analog/digital
Parallel operation 8 is sent；The input voltage in 8 two channels of double-channel analog/digital converter described in 11 synchronous acquisition of central processing unit is believed
Number, and the phase delay of two-way voltage signal is compared, and then calculate the major insulation of the bushing shell for transformer under different operating frequency
Dielectric dissipation factor；The communication equipment 12 is connect with the central processing unit 11, for will test the dielectric loss of acquirement
Frequency spectrum data is sent to server or display equipment.
In present embodiment, the laser 3, polarization maintaining optical fiber collimator A9, polarization maintaining optical fiber collimator B 10, electro-optic crystal
Component 2 must be consistent with the operation wavelength of photodetector 4.
Embodiment is described with reference to Fig. 2, and the luminescent crystal component 2 is that one kind will based on electrooptic effect of Pockels
Crystal both end voltage signal is changed into the optical device of linearly related and synchronous light intensity signal, the common model niobium of crystal
Sour lithium electro-optic crystal.The luminescent crystal component 2 includes lithium niobate electro-optic crystal, two panels polarization spectroscope and quarter wave plate, the niobium
Sour lithium electro-optic crystal side is connected to each other with wherein a piece of polarization spectroscope by crystal bonding technique, and lithium niobate electro-optic crystal is another
Side is docked by crystal bonding technique with quarter wave plate, and quarter wave plate is mutual by crystal bonding technique with another polarization spectroscope
It is connected to each other.
In present embodiment, the Rogowski coil 6 is that the Rogowski coil is notched annulus, for measuring quilt
Survey casing major insulation part to earth-current.The work upper limiting frequency of the Dual-channel digital analog converter 8 and the Rogowski coil 6
Higher than 500kHz, lower frequency limit is direct current.
The current signal that the current collection circuit 7 exports the Rogowski coil 6 carries out current-voltage conversion, output
Linearly related synchronous voltage signal, and it is sent to the double-channel analog/digital converter 8；The Dual-channel digital analog converter 8
Work upper limiting frequency should be greater than 100kHz, and lower frequency limit is direct current.
In present embodiment, the parallel electrode plate is stainless steel of the thickness not less than 2mm to 5 material, and capacitance is answered
Less than the 1/100 of the tested insulating sleeve major insulation ground capacitance, not more than 2pF.It in this way can be by the attached of introducing
Measurement result can not be influenced by adding phase difference to be reduced to.
In present embodiment, voltage effective value that the frequency of signal generator 1 generates in 50V between 100V, it is different
The range of working frequency is in 0.01Hz between 1kHz.The frequency of signal generator 1 and the parallel electrode plate are to leading between 5
The connection of single shielded cable is crossed, passes through single screen between the frequency of signal generator 1 and tested casing major insulation connecting terminal
Cover cable connection.
In present embodiment, the polarization maintaining optical fiber collimator A9 and polarization maintaining optical fiber collimator B 10 be it is a kind of will be in optical fiber
Optical signal is coupled to the lens in space with the angle of divergence less than or equal to 0.25 degree, and is able to maintain the degree of polarization and light of optical signal
Intensity.
Communication equipment 12 described in present embodiment is connect with the central processing unit 11, for will test Jie of acquirement
Matter loss frequency spectrum data is sent to server or display equipment.
Detection device described in present embodiment can be reduced more since voltage transformer introduces voltage caused by additional capacitor
The incremental phase offset of signal detection.The electromagnetic interference introduced in voltage signal measurement and transmission process can be eliminated simultaneously；Greatly
The precision and anti-interference ability of amplitude raising insulating sleeve frequency spectrum detection.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification；
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (9)
1. based on the bushing shell for transformer dielectric loss frequency spectrum detection device of photoelectric voltage measurement, including it is frequency of signal generator (1), flat
Row electrode plate is to (5), laser (3), polarization maintaining optical fiber collimator A (9), electro-optic crystal component (2), polarization maintaining optical fiber collimator B
(10), photodetector (4), Rogowski coil (6), current collection circuit (7), double-channel analog/digital converter (8) and central processing
Unit (11)；It is characterized in that:
The frequency of signal generator (1) successively issues the sine voltage signal simultaneous transmission of different frequency to parallel electrode plate pair
(5) and tested casing connecting terminal；
The laser signal that the laser (3) issues is transmitted to electro-optic crystal component (2) by polarization maintaining optical fiber collimator A (9)；
The luminescent crystal component (2) is placed on the parallel electrode plate to (5) inside, and the parallel electrode plate will be described to (5)
The sine voltage signal that frequency of signal generator (1) generates is transmitted to electro-optic crystal component (2), the electro-optic crystal component (2)
Received sine voltage signal is converted to the optical signal of frequency and amplitude synchronism output；The optical signal passes through polarization maintaining optical fibre standard
Straight device B (10) is transmitted to photodetector described in light (4), the photodetector (4) convert optical signals to it is linearly related and
The identical voltage signal of frequency is simultaneously transmitted to the double-channel analog/digital converter (8)；
The Rogowski coil (6) and tested insulating sleeve ground line connect, described for measuring tested insulating sleeve to earth-current
The current signal transfer linearity correlation and the identical voltage signal of frequency that current collection circuit (7) exports the Rogowski coil (6),
And it is sent to the double-channel analog/digital converter (8)；
The central processing unit (11) acquires the sine voltage signal in two channels of double-channel analog/digital converter (8) in real time,
And the relative phase delay of two-way voltage signal is compared, the major insulation dielectric loss of bushing shell for transformer is obtained in 0.01Hz-
Numeric distribution within the scope of 100kHz.
2. the bushing shell for transformer dielectric loss frequency spectrum detection device according to claim 1 based on photoelectric voltage measurement, special
Sign is, the laser (3), polarization maintaining optical fiber collimator A (9), polarization maintaining optical fiber collimator B (10), electro-optic crystal component (2) and
The operation wavelength of photodetector (4) is consistent.
3. the bushing shell for transformer dielectric loss frequency spectrum detection device according to claim 1 based on photoelectric voltage measurement, special
Sign is that the Rogowski coil (6) is notched annulus, for measuring the electric over the ground of tested casing major insulation part
Stream.
4. the bushing shell for transformer dielectric loss frequency spectrum detection device according to claim 1 based on photoelectric voltage measurement, special
Sign is that the maximum operation frequency of the Dual-channel digital analog converter (8) and the Rogowski coil (6) is greater than the frequency signal
Ten times of the maximum operation frequency of generator (1).
5. the bushing shell for transformer dielectric loss frequency spectrum detection device according to claim 1 based on photoelectric voltage measurement, special
Sign is,
The parallel electrode plate is less than or equal to 2pF to the stainless steel that the material of (5) is that thickness is more than or equal to 2mm, capacitance, simultaneously
Less than or equal to the 1/100 of tested casing major insulation direct-to-ground capacitance.
6. the bushing shell for transformer dielectric loss frequency spectrum detection device according to claim 1 based on photoelectric voltage measurement, special
Sign is that in 50V between 100V, operating frequency range exists the voltage effective value that the frequency of signal generator (1) generates
0.01Hz is between 1kHz.
7. the bushing shell for transformer dielectric loss frequency spectrum detection device according to claim 1 based on photoelectric voltage measurement, special
Sign is, the polarization maintaining optical fiber collimator A (9) and polarization maintaining optical fiber collimator B (10) are by the optical signal in optical fiber to be less than etc.
Be coupled to the lens in space in 0.25 degree of angle, the optical fiber which is connected can keep transmitted optical signal degree of polarization and
Luminous intensity.
8. the bushing shell for transformer dielectric loss frequency spectrum detection device according to claim 1 based on photoelectric voltage measurement, special
Sign is that the frequency of signal generator (1) and the parallel electrode plate are connected between (5) by single shielded cable, institute
It states and is connected between frequency of signal generator (1) and tested casing major insulation connecting terminal by single shielded cable.
9. the bushing shell for transformer dielectric loss frequency spectrum detection device according to claim 1 based on photoelectric voltage measurement, special
Sign is, further includes communication equipment (12), and the communication equipment (12) connect with the central processing unit (11), for that will examine
It surveys the dielectric loss frequency spectrum data obtained and is sent to server or display equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910666243.1A CN110412436A (en) | 2019-07-23 | 2019-07-23 | Bushing shell for transformer dielectric loss frequency spectrum detection device based on photoelectric voltage measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910666243.1A CN110412436A (en) | 2019-07-23 | 2019-07-23 | Bushing shell for transformer dielectric loss frequency spectrum detection device based on photoelectric voltage measurement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110412436A true CN110412436A (en) | 2019-11-05 |
Family
ID=68362593
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910666243.1A Pending CN110412436A (en) | 2019-07-23 | 2019-07-23 | Bushing shell for transformer dielectric loss frequency spectrum detection device based on photoelectric voltage measurement |
Country Status (1)
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| CN (1) | CN110412436A (en) |
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Application publication date: 20191105 |