CN103869224A - Capacitive equipment partial discharge detection method based on optical fiber current sensor - Google Patents
Capacitive equipment partial discharge detection method based on optical fiber current sensor Download PDFInfo
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Abstract
The invention discloses a capacitive equipment partial discharge detection method based on an optical fiber current sensor. The capacitive equipment partial discharge detection method based on the optical fiber current sensor mainly comprises the following steps: establishing a mathematical model of the optical fiber current sensor; designing the structure of the optical fiber current sensor; analyzing and testing the performance of the optical fiber current sensor; testing a local discharge experiment system. According to the capacitive equipment partial discharge detection method based on the optical fiber current sensor, which is disclosed by the invention, the defects of poor antijamming capability, low reliability, small applicable range and the like in the prior art can be overcome, and the advantages of good antijamming capability, high reliability and big applicable range can be realized.
Description
Technical field
The present invention relates to electric power monitoring technical field, particularly, relate to a kind of capacitive apparatus detection method for local discharge based on fibre optic current sensor.
Background technology
Along with the development of national economy, the requirement of electric system reliability service is more and more higher.Electrical equipment is the primary element of composition electric system, once have an accident, not only can involve nearby device, also can cause heavy economic losses to user.Great mass of data shows, failure of insulation is the main cause that causes electrical equipment malfunction, and shelf depreciation is to cause the main cause of insulation fault, due to the shelf depreciation of insulation defect initiation, make the long-time voltage breakdown of dielectric usually less than the part of short-time breakdown voltage, therefore, shelf depreciation is extremely paid attention to as principal element of insulation degradation in the long-time running of various large electric equipment.Anti-interference problem is one of matter of utmost importance of partial discharge monitoring always.
Optical fiber has very strong anti-electromagnetic interference performance as light sensing element and the transmission channel of electric discharge, and in recent years, the development of fiber optic sensor technology is very rapid, demonstrates huge potentiality to be exploited and application prospect.This bright a kind of partial discharge detecting sensor based---the fibre optic current sensor of having developed of this technology.It has not only eliminated the impact of electromagnetic interference (EMI) on Partial Discharge Detection from sensor design principle, and can obtain the information the same with pulse current detection method, in having inherited the method advantage, overcome the anti-interference difficult problem that current various detection method exists, be of great significance for the accurate detection tool of local discharge signal.
The detection of shelf depreciation is all that the various phenomenons that produced taking shelf depreciation are foundation, characterizes the state of shelf depreciation by different physical quantitys.There is at present the multiple detection methods such as current impulse, ultrasound wave, optics, chemistry, utilize pulse current method and ultrasonic Detection Method to detect local discharge signal comparatively extensive.
Can detect by detecting impedance or current sensor the pulse current being caused by shelf depreciation in bottom shielding of bushing ground wire, earthing of casing line, iron core grounding line, and obtain Apparent discharge magnitude.This be study the earliest, most widely used a kind of detection method.The major defect of this detection method is the electric capacity when sample when larger, is subject to the restriction of mutual impedance, and the measurement sensitivity of testing tool simultaneously has also been subject to certain restriction; In laboratory, medium sensitivity is higher, and Site Detection is subject to the impact of external interference, poor anti jamming capability.
Supersonic testing method is mainly used in judging qualitatively having or not of local discharge signal, and in conjunction with electric impulse signal or directly utilize the ultrasonic signal source of putting of playing a game to carry out physical positioning.But power equipment built-in electrical insulation complex structure, the decay of various media on sound wave and all different on the impact of the velocity of sound, especially can only reach 500pC to the online detection sensitivity of transformer.
Traditional partial discharge monitoring method respectively has relative merits, cannot treat different things as the same, and need to adopt suitable method for different requirements and object according to site specific.But very complicated owing to disturbing in the scene at electrical equipment place, and local discharge signal is very faint, will inevitably be subject to the interference of on-the-spot various noise sources, obtain accurately the true local discharge signal that signal to noise ratio (S/N ratio) is higher and just can carry out follow-up signal processing, the sensing system therefore with premium properties is the basis of partial discharge monitoring and fault diagnosis.
Realizing in process of the present invention, inventor finds at least to exist in prior art the defect such as the low and scope of application of poor anti jamming capability, reliability is little.
Summary of the invention
The object of the invention is to, for the problems referred to above, propose a kind of capacitive apparatus detection method for local discharge based on fibre optic current sensor, to realize the advantage that antijamming capability is good, reliability is high and the scope of application is large.
For achieving the above object, the technical solution used in the present invention is: a kind of capacitive apparatus detection method for local discharge based on fibre optic current sensor, mainly comprises:
A, set up the mathematical model of fibre optic current sensor;
The structure of b, design fibre optic current sensor;
The performance evaluation of c, fibre optic current sensor and test;
D, the test of shelf depreciation experimental system.
Further, in step a, the operation of the described mathematical model of setting up fibre optic current sensor, specifically comprises:
Utilize in the basic theories of Faraday effect and optical fiber birefringent fundamental characteristics and produce reason, the Jones vector of a random polarization light is decomposed into the form of the polarized light Jones vector stack of two appointments, polarization light intensity is the intensity sum of its two vectors, first suppose when monochromatic optical wave is propagated along z axle positive dirction, its vibration is parallel to x-y plane, and the normalization Jones equation of deriving polarization state light is
then analyze light vector and x axle is into θ angle, amplitude is a linearly polarized light, the normalization Jones vector that obtains polarization state light is
Wherein a
x, a
yfor amplitude, a is the ratio of xy axle amplitude, and δ is xy axle phase differential;
The normalization Jones vector of the polarization state light based on obtaining, derive and obtain the Jones matrix of polarizer:
The polarizer, analyzer angle are set as to 45 °, and the company that shows as Jones matrix on mathematics takes advantage of:
E
2=P
(± 45 °+θ)fE
1, compute matrix P, F and E respectively
1, finally obtain output intensity formula and be
set up the mathematical model for the fibre optic current sensor of Partial Discharge Detection.
Further, in step b, the operation of the structure of described design fibre optic current sensor, mainly comprises:
Adopt flexible jumper to carry out the flexible connection of optical fiber, in polarized systems, between polarizer, adopted permanent soldered the connecing of melting, in order to guarantee the leakproofness of optic path simultaneously;
Select light emitting diode as light source;
Design and can meet the high stability of measuring, the driving circuit of high reliability;
Selective light electric explorer, changes electric signal into faint light signal.
Further, described flexible jumper, comprises two connector plugs, converter, the insert with two tail optical fibers that Yi Ge center aligning parts is identical with two; Described connector plug is mainly made up of the right cylinder pin body with micropore and some exterior mechanical constitutional details, realizes the operation of plug; Converter is mainly made up of a ring flange and two pin bodies with tail optical fiber monofiber cable, and converter links together fibre-optical splice, and optical fiber is connected.
Further, described fibre optic current sensor, comprise the driving circuit, light source and the polarizer that connect successively, the signal processor, photodetector and the analyzer that connect successively, the sensing fiber ring that one end is connected away from one end of light source with the polarizer and the other end is connected away from one end of photodetector with analyzer, and be arranged on the conductor of described sensing fiber ring inside; The main application activity connector of described current sensor carries out the flexible connection of optical fiber, has adopted permanent soldered the connecing of melting, in order to guarantee the leakproofness of optic path between polarizer simultaneously; Fiber active linker is to realize the Passive Optical Components being flexibly connected between optical fiber, and fiber active linker is also for being connected optical fiber with other passive device, optical fiber with active device, optical fiber with system and instrument.
Further, between described light source and the polarizer and between photodetector and analyzer, be respectively equipped with polarization maintaining optical fibre.
Further, in step c, the performance evaluation of described fibre optic current sensor and the operation of test, specifically comprise:
Sensor fibre length between analyzer and the polarizer is 4m, closed light path diameter is about 6cm, f-number is 20 circles, the first no power of conductor, do not having in externally-applied magnetic field situation, actual measurement is not 70.4mV through the photo-detector VD of amplification and filtering, can calculate the optical path loss of fibre optic current sensor according to output voltage;
Set up frequency characteristic experimental system;
Adopt bipitch tubular type structural design, respectively electrical conductor and optical fiber are coiled into solenoid structure, make magnetic direction that conductor forms identical with the light path direction of propagation, fibre optic current sensor is measured the magnetic field that is parallel to polarized light, detects 2mA office discharge stream;
In order to verify that fibre optic current sensor, for situation dissimilar and frequency signal response, adopts high birefringence panda type polarization-preserving fiber, utilize signal generator to produce sinusoidal signal and test.
Further, described frequency characteristic experimental system, comprise the slide rheostat, digital oscilloscope and the signal generator that connect successively, the signal processing module being connected with described signal generator and digital oscilloscope respectively, and the fibre optic current sensor being connected with described signal processing module; In the periphery of described fibre optic current sensor, be provided with thermal insulation protection shell.
Further, in steps d, the operation of described shelf depreciation experimental system test, specifically comprises:
Set up shelf depreciation experimental system;
According to shelf depreciation experimental system built-in electrical insulation structure and Electric Field Distribution, sharp plate electric discharge, the electric discharge of plate plate, internal discharge, creeping discharge and five kinds of Typical PD Models of suspended discharge are set, gather local discharge signal by fibre optic current sensor.
Further, described shelf depreciation experimental system, comprise the AC power and the transformer that connect successively, be connected to current limliting water resistance, test specimen and fibre optic current sensor between the first link of described transformer secondary coil and the second link of transformer secondary coil in turn, be connected to the coupling capacitance between the common port of described current limliting water resistance and test specimen and the second link of transformer secondary coil, and the digital oscilloscope being connected with described fibre optic current sensor; The second link ground connection of described transformer secondary coil.
The capacitive apparatus detection method for local discharge based on fibre optic current sensor of various embodiments of the present invention, owing to mainly comprising: the mathematical model of setting up fibre optic current sensor; The structure of design fibre optic current sensor; The performance evaluation of fibre optic current sensor and test; The test of shelf depreciation experimental system; Can detect local discharge signal exactly, understand in time line insulation aging conditions; Thereby can overcome poor anti jamming capability in prior art, reliability is low and the scope of application is little defect, to realize the advantage that antijamming capability is good, reliability is high and the scope of application is large.
Other features and advantages of the present invention will be set forth in the following description, and, partly from instructions, become apparent, or understand by implementing the present invention.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Brief description of the drawings
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for instructions, for explaining the present invention, is not construed as limiting the invention together with embodiments of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation that the present invention is based on fibre optic current sensor in the capacitive apparatus detection method for local discharge of fibre optic current sensor;
Fig. 2 is the principle of work schematic diagram that the present invention is based on the capacitive apparatus detection method for local discharge medium frequency property testing system of fibre optic current sensor;
Fig. 3 is the principle of work schematic diagram that the present invention is based on shelf depreciation testing experimental system in the capacitive apparatus detection method for local discharge of fibre optic current sensor.
By reference to the accompanying drawings, in the embodiment of the present invention, Reference numeral is as follows:
1-polarization maintaining optical fibre; 2-test specimen; 3-fibre optic current sensor; 4-TDS3032B digital oscilloscope.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein, only for description and interpretation the present invention, is not intended to limit the present invention.
Because discharge pulse energy is less, and have certain randomness, and the discharge signal of some jam-to-signal equipment itself is also wanted large manyfold, this is just having a strong impact on the sensitivity of test and the reliability of detection, so must the high performance sensor of development.To the optical device the present invention relates to corresponding Jones matrix of deriving, and set up the mathematical model of fibre optic current sensor.Office's discharge stream signal has the advantages that frequency distribution scope is wide, amplitude is faint, need to develop wideband high-frequency fibre optic current sensor, and design corresponding signal processing circuit.The discharge data that finally also should obtain by IEC270 canonical measure those, carries out pattern-recognition and insulation residual life evaluation.
According to the embodiment of the present invention, as shown in Figure 1-Figure 3, provide a kind of capacitive apparatus detection method for local discharge based on fibre optic current sensor, can detect local discharge signal exactly, understand in time line insulation aging conditions.
The capacitive apparatus detection method for local discharge based on fibre optic current sensor of the present embodiment, mainly comprises:
Set up fibre optic current sensor mathematical model according to Faraday magneto-optic effect principle, utilize method of Jones calculus design, the polarized light system of fibre optic current sensor; Select the light source that light emitting diode is sensor, and design overload protecting circuit and constant-current drive circuit according to light source characteristic; PIN photodiode is applied in photovoltaic converter, and faint light signal is changed into electric signal; Propose bipitch tubular type structural design, respectively electrical conductor and optical fiber have been coiled into solenoid structure, made magnetic direction that conductor forms identical with the light path direction of propagation, fainter local discharge signal can have been detected; Adopt high birefringence panda type polarization-preserving fiber, except reducing the linear birefringent impact of optical fiber, can also avoid temperature to exert an influence to OCS accuracy of measurement; Fractal theory, for compression and the feature extraction of three-dimensional time-frequency spectrum data, is reflected to the steepness at time-frequency spectrum peak value place and the variation tendency of negative edge, simplified the dimension of proper vector, made the local discharge signal data that record more visual and clear.
Particularly, the capacitive apparatus detection method for local discharge based on fibre optic current sensor of the present embodiment, mainly comprises the following steps:
Step 1: utilize method of Jones calculus to set up the mathematical model of fibre optic current sensor, design respectively the various piece concrete structure of sensor;
Set up fibre optic current sensor mathematical model according to Faraday magneto-optic effect principle, utilize method of Jones calculus design, the polarized light system of fibre optic current sensor;
Select the light source that light emitting diode is sensor, and design overload protecting circuit and constant-current drive circuit according to light source characteristic;
PIN photodiode is applied in photovoltaic converter, and faint light signal is changed into electric signal;
The light source of fibre optic current sensor is light emitting diode, and designs overload protecting circuit and constant-current drive circuit according to light source characteristic, with the high stability, the high reliability that ensure to measure;
What photovoltaic converter part was used is PIN photodiode, ensures faint light signal to change accurately electric signal into;
Step 2: set up shelf depreciation experimental system, designed sharp plate electric discharge, the electric discharge of plate plate, internal discharge, creeping discharge and five kinds of Typical PD Models of suspended discharge;
Propose bipitch tubular type structural design, respectively electrical conductor and optical fiber have been coiled into solenoid structure, made magnetic direction that conductor forms identical with the light path direction of propagation, fainter local discharge signal can have been detected;
Adopt high birefringence panda type polarization-preserving fiber, except reducing the linear birefringent impact of optical fiber, can also avoid temperature to exert an influence to OCS accuracy of measurement;
Fractal theory, for compression and the feature extraction of three-dimensional time-frequency spectrum data, is reflected to the steepness at time-frequency spectrum peak value place and the variation tendency of negative edge, simplified the dimension of proper vector, made the local discharge signal data that record more visual and clear
Step 3: gathered local discharge signal by fibre optic current sensor, studied the feature of dissimilar Partial discharge signal;
The frequency spectrum that device interior disturbs mainly concentrates on below 2MHz, can utilize bandpass filter to be removed for the low-frequency disturbance that is mainly distributed in 2-10MHz frequency range;
Fibre optic current sensor optical path loss is 21.3dB.
The optical source wavelength of sensor is 1310nm, and power is 1.7mW, and photodetector responsiveness is 0.97A/W, and the response time is 0.5ns, and external 1k Ω detects impedance, sensor fibre 100m, and closed light path diameter is 6cm, f-number is 500.
That is to say, the capacitive apparatus detection method for local discharge based on fibre optic current sensor of above-described embodiment, mainly comprises the following aspects:
(1) set up the mathematical model of fibre optic current sensor:
Because scene interference is too strong, the signal to noise ratio (S/N ratio) of signal is too low, so also do not have at present reliable noise-eliminating method to extract for local discharge signal.The major advantage of Fibre Optical Sensor is that anti-electromagnetic interference capability is strong, good insulation preformance, and sensing speed is fast, there is no magnetic saturation phenomenon, and working band is wider.The present invention utilizes in the basic theories of Faraday effect and optical fiber birefringent fundamental characteristics and produces reason, by the Jones matrix method of polarized systems, provide the normalization Jones vector of several polarization state lights, to the polarizer the relating to corresponding Jones matrix of having derived, set up the mathematical model of system herein; Analyze the feature of dissimilar fibre optic current sensor, for the fibre optic current sensor development for Partial Discharge Detection lays the first stone.
Particularly, utilize in the basic theories of Faraday effect and optical fiber birefringent fundamental characteristics and produce reason, the Jones vector of a random polarization light is decomposed into the form of the polarized light Jones vector stack of two appointments, polarization light intensity is the intensity sum of its two vectors, first suppose when monochromatic optical wave is propagated along z axle positive dirction, its vibration is parallel to x-y plane, and the normalization Jones equation of deriving polarization state light is
then analyze light vector and x axle is into θ angle, amplitude is a linearly polarized light, the normalization Jones vector that obtains polarization state light is
Wherein a
x, a
yfor amplitude, a is the ratio of xy axle amplitude, and δ is xy axle phase differential;
The normalization Jones vector of the polarization state light based on obtaining, derive and obtain the Jones matrix of polarizer:
The polarizer, analyzer angle are set as to 45 °, and the company that shows as Jones matrix on mathematics takes advantage of: E
2=P
(± 45 °+θ)fE
1, compute matrix P, F and E respectively
1, finally obtain output intensity formula and be
set up the mathematical model for the fibre optic current sensor of Partial Discharge Detection.
(2) the structural design of fibre optic current sensor:
All-fiber current sensor is simple in structure, and making and installation are all very convenient, has overcome the shortcoming of direct flash spotting, is suitable for partial discharge monitoring.The main application activity connector of the present invention carries out the flexible connection of optical fiber, has adopted permanent soldered the connecing of melting, in order to guarantee the leakproofness of optic path between polarizer simultaneously.Flexible jumper refers to that two connector plugs add a converter, i.e. three chief components: Yi Ge center aligning parts, two identical inserts with two tail optical fibers.The driving circuit of light emitting diode is fairly simple, and price is relatively cheap, and the life-span is long, and hydraulic performance decline is slower, so select light emitting diode as light source.Reach good measuring accuracy, just light source has been proposed to high requirement, need the constant optical power output of high stability, this just requires first to design and can meet the high stability of measuring, the driving circuit of high reliability.Photodetector changes electric signal into faint light signal, and its performance is directly connected to sensitivity and the bandwidth of whole detection system, therefore must select suitable photodetector.
Particularly, flexible jumper, comprises two connector plugs, converter, the insert with two tail optical fibers that Yi Ge center aligning parts is identical with two; Connector plug is mainly made up of the right cylinder pin body with micropore and some exterior mechanical constitutional details, realizes the operation of plug; Converter is mainly made up of a ring flange and two pin bodies with tail optical fiber monofiber cable, and converter links together fibre-optical splice, and optical fiber is connected.
Under the prerequisite that meets dependable with function, designed the high-performance optical fiber current sensor that detects local discharge signal according to these principles, its structural drawing as shown in Figure 1.
In Fig. 1, fibre optic current sensor, comprise the driving circuit, light source and the polarizer that connect successively, the signal processor, photodetector and the analyzer that connect successively, the sensing fiber ring that one end is connected away from one end of light source with the polarizer and the other end is connected away from one end of photodetector with analyzer, and be arranged on the conductor of sensing fiber ring inside.Between light source and the polarizer and between photodetector and analyzer, be respectively equipped with polarization maintaining optical fibre (as polarization maintaining optical fibre 1).
(3) the performance evaluation of fibre optic current sensor and test:
Sensor fibre length between analyzer and the polarizer is 4m, closed light path diameter is about 6cm, f-number is 20 circles, the first no power of conductor, do not having in externally-applied magnetic field situation, actual measurement is not 70.4mV through the photo-detector VD of amplification and filtering, the fibre optic current sensor optical path loss that can calculate development herein according to output voltage is 21.3dB, 30dB optical path loss in method is compared before, and polarization maintaining optical fibre has been avoided the error of bringing due to the reason such as extraneous vibration and fibre-optical bending in optical signal transmission process; The design of optical-fiber type polarizer has greatly reduced interference and the optic path loss of extraneous natural light, and totally-enclosed design has improved the sensitivity of fibre optic current sensor, and fabrication and installation are also more convenient, are conducive to detect faint office's discharge stream pulse.
Particularly, fibre optic current sensor, comprise the driving circuit, light source and the polarizer that connect successively, the signal processor, photodetector and the analyzer that connect successively, the sensing fiber ring that one end is connected away from one end of light source with the polarizer and the other end is connected away from one end of photodetector with analyzer, and be arranged on the conductor of sensing fiber ring inside; The main application activity connector of current sensor carries out the flexible connection of optical fiber, has adopted permanent soldered the connecing of melting, in order to guarantee the leakproofness of optic path between polarizer simultaneously; Fiber active linker is to realize the Passive Optical Components being flexibly connected between optical fiber, and fiber active linker is also for being connected optical fiber with other passive device, optical fiber with active device, optical fiber with system and instrument.
Office's discharge stream is about several milliamperes to tens milliamperes, can reach 0.2 grade at present for the fibre optic current sensor sensitivity of electric system checking of great current, puts detection needs but can't meet office.The present invention proposes bipitch tubular type structural design, respectively electrical conductor and optical fiber are coiled into solenoid structure, make magnetic direction that conductor forms identical with the light path direction of propagation, fibre optic current sensor is measured the magnetic field that is parallel to polarized light, can detect 2mA office discharge stream.
Should can reach in theory 2GHz by the capacitive apparatus detection method for local discharge optical element used based on fibre optic current sensor, the actual Hz-KHz detecting is owing to being limited by signal processing and opto-electronic conversion loop, and the effective detection bandwidth of sensor is 300MHz.In order to verify that fibre optic current sensor, for situation dissimilar and frequency signal response, utilizes signal generator to produce sinusoidal signal and tests, experimental system as shown in Figure 2.
In Fig. 2, frequency characteristic experimental system, comprise the slide rheostat, digital oscilloscope and the signal generator that connect successively, the signal processing module being connected with signal generator and digital oscilloscope respectively, and the fibre optic current sensor being connected with signal processing module; In the periphery of fibre optic current sensor, be provided with thermal insulation protection shell.
Linear birefringence effect has destroyed system linearity character.In the time not there is not linear birefrigence in system, between the input and output of system, it is linear relationship, intrinsic circular birefringence does not affect system responses, visible, sensor fibre linear birefrigence and other factors interact, make system responses complicated, if can eliminate linear birefrigence, the impact of other factors just becomes easy prediction and processing.Due to linear birefringence effect and optical-fiber deformation, inside of optical fibre stress, light source light wavelength, environment temperature, because many factors such as linear birefringence effect and optical-fiber deformation, inside of optical fibre stress, light source light wavelength, environment temperature, bending, torsion, vibration are relevant, so system output can be subject to the modulation of this tittle, this can make the measurement sensitivity of system change with above-mentioned amount, thus the robustness of impair system.Adopt high birefringence panda type polarization-preserving fiber herein, except reducing the linear birefringent impact of optical fiber, can also avoid temperature to exert an influence to OCS accuracy of measurement.
(4) shelf depreciation experimental system test
Set up shelf depreciation experimental system, as shown in Figure 3, sharp plate electric discharge, the electric discharge of plate plate, internal discharge, creeping discharge and five kinds of Typical PD Models of suspended discharge are designed according to device interior insulation system and Electric Field Distribution, gather local discharge signal by fibre optic current sensor, studied the feature of dissimilar Partial discharge signal, experimental result shows that this sensing system can meet test request.
In Fig. 3, shelf depreciation experimental system, comprise the AC power and the transformer that connect successively, be connected to the current limliting water resistance (as 5M Ω current limliting water resistance R) between the first link of transformer secondary coil and the second link of transformer secondary coil in turn, test specimen (as test specimen 2) and fibre optic current sensor (as fibre optic current sensor 3), be connected to the coupling capacitance (as coupling capacitance C) between the common port of current limliting water resistance and test specimen and the second link of transformer secondary coil, and the digital oscilloscope being connected with fibre optic current sensor (as TDS3032B digital oscilloscope 4), the second link ground connection of transformer secondary coil.Between transformer primary side coil the first link and transformer primary side coil the second link, be also connected with voltage table V.
The capacitive apparatus detection method for local discharge based on fibre optic current sensor of the embodiment of the various embodiments described above of the present invention, using and trying out through Gansu Utilities Electric Co., can effectively detect local discharge signal, understand in time working line aging conditions, validity and the feasibility of checking technical solution of the present invention.
In sum; the capacitive apparatus detection method for local discharge based on fibre optic current sensor of the embodiment of the various embodiments described above of the present invention; mainly comprise: utilize this advanced technology design fibre optic current sensor of optical fiber; for the reliable holding circuit of sensor design and driving circuit; the birefringent minishing method of single-mode fiber, local discharge signal pattern-recognition.The capacitive apparatus detection method for local discharge based on fibre optic current sensor of this embodiment, at least can reach following beneficial effect:
(1) be somebody's turn to do the fibre optic current sensor of the detection local discharge signal in the capacitive apparatus detection method for local discharge based on fibre optic current sensor, the not only interference-free impact of its optical detection part, and the testing circuit of sensor and sensing loop are separated, overcome the shortcoming that other detection method electronic loops are easily disturbed, there is the features such as strong, the highly sensitive and fast response time of antijamming capability;
(2) be somebody's turn to do the capacitive apparatus detection method for local discharge based on fibre optic current sensor, solve the timely and effective monitoring problem of the aging circuit situation causing due to shelf depreciation in electric system, conveniently carry out various classified inquiries, for operations staff provides reliable aging data, be conducive to change in time aging circuit, avoid the generation of power failure, electric power research tool is of great significance.
Finally it should be noted that: the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although the present invention is had been described in detail with reference to previous embodiment, for a person skilled in the art, its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. the capacitive apparatus detection method for local discharge based on fibre optic current sensor, is characterized in that, mainly comprises:
A, set up the mathematical model of fibre optic current sensor;
The structure of b, design fibre optic current sensor;
The performance evaluation of c, fibre optic current sensor and test;
D, the test of shelf depreciation experimental system.
2. the capacitive apparatus detection method for local discharge based on fibre optic current sensor according to claim 1, is characterized in that, in step a, the operation of the described mathematical model of setting up fibre optic current sensor, specifically comprises:
Utilize in the basic theories of Faraday effect and optical fiber birefringent fundamental characteristics and produce reason, the Jones vector of a random polarization light is decomposed into the form of the polarized light Jones vector stack of two appointments, polarization light intensity is the intensity sum of its two vectors, first suppose when monochromatic optical wave is propagated along z axle positive dirction, its vibration is parallel to x-y plane, and the normalization Jones equation of deriving polarization state light is
then analyze light vector and x axle is into θ angle, amplitude is a linearly polarized light, the normalization Jones vector that obtains polarization state light is
Wherein a
x, a
yfor amplitude, a is the ratio of xy axle amplitude, and δ is xy axle phase differential;
The normalization Jones vector of the polarization state light based on obtaining, derive and obtain the Jones matrix of polarizer:
The polarizer, analyzer angle are set as to 45 °, and the company that shows as Jones matrix on mathematics takes advantage of:
E
2=P
(± 45 °+θ) FE
1, compute matrix P, F and E respectively
1, finally obtain output intensity formula and be
set up the mathematical model for the fibre optic current sensor of Partial Discharge Detection.
3. the capacitive apparatus detection method for local discharge based on fibre optic current sensor according to claim 2, is characterized in that, in step b, the operation of the structure of described design fibre optic current sensor, mainly comprises:
Adopt flexible jumper to carry out the flexible connection of optical fiber, in polarized systems, between polarizer, adopted permanent soldered the connecing of melting, in order to guarantee the leakproofness of optic path simultaneously;
Select light emitting diode as light source;
Design and can meet the high stability of measuring, the driving circuit of high reliability;
Selective light electric explorer, changes electric signal into faint light signal.
4. the capacitive apparatus detection method for local discharge based on fibre optic current sensor according to claim 3, it is characterized in that, described flexible jumper, comprise two connector plugs and a converter, i.e. three chief components: the insert with two tail optical fibers that Yi Ge center aligning parts is identical with two;
Described connector plug is mainly made up of the right cylinder pin body with micropore and some exterior mechanical constitutional details, realizes the operation of plug; Converter is mainly made up of a ring flange and two pin bodies with tail optical fiber monofiber cable, and converter links together fibre-optical splice, and optical fiber is connected.
5. according to the capacitive apparatus detection method for local discharge based on fibre optic current sensor described in any one in claim 1-4, it is characterized in that, described fibre optic current sensor, comprise the driving circuit, light source and the polarizer that connect successively, the signal processor, photodetector and the analyzer that connect successively, the sensing fiber ring that one end is connected away from one end of light source with the polarizer and the other end is connected away from one end of photodetector with analyzer, and be arranged on the conductor of described sensing fiber ring inside;
The main application activity connector of described current sensor carries out the flexible connection of optical fiber, has adopted permanent soldered the connecing of melting, in order to guarantee the leakproofness of optic path between polarizer simultaneously; Fiber active linker is to realize the Passive Optical Components being flexibly connected between optical fiber, and fiber active linker is also for being connected optical fiber with other passive device, optical fiber with active device, optical fiber with system and instrument.
6. the capacitive apparatus detection method for local discharge based on fibre optic current sensor according to claim 5, is characterized in that, between described light source and the polarizer and between photodetector and analyzer, is respectively equipped with polarization maintaining optical fibre.
7. the capacitive apparatus detection method for local discharge based on fibre optic current sensor according to claim 5, is characterized in that, in step c, the performance evaluation of described fibre optic current sensor and the operation of test, specifically comprise:
Sensor fibre length between analyzer and the polarizer is 4m, closed light path diameter is about 6cm, f-number is 20 circles, the first no power of conductor, do not having in externally-applied magnetic field situation, actual measurement is not 70.4mV through the photo-detector VD of amplification and filtering, can calculate the optical path loss of fibre optic current sensor according to output voltage;
Set up frequency characteristic experimental system;
Adopt bipitch tubular type structural design, respectively electrical conductor and optical fiber are coiled into solenoid structure, make magnetic direction that conductor forms identical with the light path direction of propagation, fibre optic current sensor is measured the magnetic field that is parallel to polarized light, detects 2mA office discharge stream;
In order to verify that fibre optic current sensor, for situation dissimilar and frequency signal response, adopts high birefringence panda type polarization-preserving fiber, utilize signal generator to produce sinusoidal signal and test.
8. the capacitive apparatus detection method for local discharge based on fibre optic current sensor according to claim 7, it is characterized in that, described frequency characteristic experimental system, comprise the slide rheostat, digital oscilloscope and the signal generator that connect successively, the signal processing module being connected with described signal generator and digital oscilloscope respectively, and the fibre optic current sensor being connected with described signal processing module; In the periphery of described fibre optic current sensor, be provided with thermal insulation protection shell.
9. the capacitive apparatus detection method for local discharge based on fibre optic current sensor according to claim 7, is characterized in that, in steps d, the operation of described shelf depreciation experimental system test, specifically comprises:
Set up shelf depreciation experimental system;
According to shelf depreciation experimental system built-in electrical insulation structure and Electric Field Distribution, sharp plate electric discharge, the electric discharge of plate plate, internal discharge, creeping discharge and five kinds of Typical PD Models of suspended discharge are set, gather local discharge signal by fibre optic current sensor.
10. the capacitive apparatus detection method for local discharge based on fibre optic current sensor according to claim 6, it is characterized in that, described shelf depreciation experimental system, comprise the AC power and the transformer that connect successively, be connected to the current limliting water resistance between the first link of described transformer secondary coil and the second link of transformer secondary coil in turn, test specimen and fibre optic current sensor, be connected to the coupling capacitance between the common port of described current limliting water resistance and test specimen and the second link of transformer secondary coil, and the digital oscilloscope being connected with described fibre optic current sensor, the second link ground connection of described transformer secondary coil.
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| CN105137302A (en) * | 2015-09-11 | 2015-12-09 | 四川菲博斯科技有限责任公司 | Transformer partial discharge on-line monitoring system based on optical fiber |
| CN105182196A (en) * | 2015-09-11 | 2015-12-23 | 四川菲博斯科技有限责任公司 | Partial transformer discharging monitoring evaluation system based on fiber |
| CN106093732A (en) * | 2016-07-28 | 2016-11-09 | 华北电力大学 | Optical fiber direction sensor for high voltage electric equipment Partial Discharge Detection |
| CN106093732B (en) * | 2016-07-28 | 2019-01-15 | 华北电力大学 | Optical fiber direction sensor for high voltage electric equipment Partial Discharge Detection |
| CN107015124A (en) * | 2017-01-13 | 2017-08-04 | 国网山东省电力公司日照供电公司 | A kind of Partial discharge signal disturbance restraining method decomposed based on framing adaptive sparse |
| CN107015124B (en) * | 2017-01-13 | 2019-08-16 | 国网山东省电力公司日照供电公司 | A kind of Partial discharge signal disturbance restraining method decomposed based on framing adaptive sparse |
| CN108303625A (en) * | 2018-02-08 | 2018-07-20 | 全球能源互联网欧洲研究院 | Cable run partial discharge monitoring device, method, terminal and readable storage medium storing program for executing |
| CN108303625B (en) * | 2018-02-08 | 2020-09-08 | 全球能源互联网欧洲研究院 | Cable line partial discharge monitoring device, method, terminal and readable storage medium |
| CN109949992A (en) * | 2019-03-22 | 2019-06-28 | 广西电网有限责任公司桂林供电局 | A kind of power cable with shelf depreciation self-checking function |
| CN110031734A (en) * | 2019-05-10 | 2019-07-19 | 华北电力大学（保定） | A kind of transformer optical fiber detector |
| CN112014703A (en) * | 2020-08-31 | 2020-12-01 | 常州信息职业技术学院 | Robot inspection method under abnormal local discharge current of power pipe gallery |
| CN113933559A (en) * | 2021-12-16 | 2022-01-14 | 北京世维通光智能科技有限公司 | Optical fiber current sensor |
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