CN106405350A - Device for partial discharge detection of electrical device - Google Patents
Device for partial discharge detection of electrical device Download PDFInfo
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- CN106405350A CN106405350A CN201610866779.4A CN201610866779A CN106405350A CN 106405350 A CN106405350 A CN 106405350A CN 201610866779 A CN201610866779 A CN 201610866779A CN 106405350 A CN106405350 A CN 106405350A
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- optical fiber
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- passes
- outfan
- connects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- 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
- G01R31/1218—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 using optical methods; using charged particle, e.g. electron, beams or X-rays
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Magnetic Variables (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The present invention discloses a device for partial discharge detection of an electrical device. The device comprises a light source, a fiber magnetic field sensor, a fiber electric field sensor, a signal processing unit and a wireless communication unit. The fiber magnetic field sensor and the fiber electric field sensor are arranged to obtain the polarities of the electric field and the magnetic field around a conductor to be detected, and the propagation direction of the partial discharging signals is determined according to the obtained electric field and the magnetic field, so that the detection sensitivity is high, the directivity is good, the antijamming capability is high, the influence of temperature changing is little, and the optical path loss is small; the fiber magnetic field sensor can realize the reciprocity optical path measurement of the magnetic field measurement, and the precision is high; and the signal processing unit and the wireless communication unit are arranged to process the obtained partial discharge signals, and the obtained partial discharge signals are sent to an external terminal device through the wireless communication unit, so that the detection safety and the convenience are improved. The device for partial discharge detection of the electrical device is simple in structure, convenient in operation, high in precision and high in reliability.
Description
Technical field：
The invention belongs to sensor technical field, it is specifically related to a kind of dress for local discharge of electrical equipment detection
Put.
Background technology：
High voltage electric equipment often shows as progressively development and the enhancing of shelf depreciation sending before dielectric punctures,
Insulation fault usually originates from the insulation degradation that shelf depreciation causes.Shelf depreciation is the important sign that insulation occurs deterioration, absolutely
The degradation of edge is higher, and partial dis-charge activity is stronger, simultaneously shelf depreciation be also lead to insulate deteriorate further important
Reason.Detection for the shelf depreciation of the high voltage electric equipments such as transformator has multiple methods, main inclusion very high frequency(VHF) pulse electricity
Stream detection method, uhf electromagnetic wave detection method and piezoelectric transducer ultrasonic Detection Method etc..Wherein the detection of first two method is
The signal of telecommunication, is easily disturbed by electromagnetic interference signal, and piezoelectric transducer ultrasound examination is ultrasonic signal although being difficult
Affected by electromagnetic noise, but sensor is to be attached to the ultrasound wave that the internal shelf depreciation of testing equipment on device housings produces
Signal, so sensitivity is not high.
The existing technology using optical method for measuring high voltage electric equipment shelf depreciation mainly has following several：The first
It is direct detection visible ray method, the method is suitable for the high voltage electric equipment with transparent dielectric as insulant, inapplicable
In solid dielectric, liquid dielectric as the high voltage electric equipment of insulant Partial Discharge Detection；Second is light-super
Sonic method, the method has the advantages that strong antijamming capability, good insulating, but it requires sensor accuracy height, processing difficulties, and
Affected larger by temperature change, ultrasonic signal has more catadioptric and easily decays；The third is based on Faraday magneto-optical
Effect principle, the fibre optic current sensor that the method adopts is only suitable for the shelf depreciation inspection of the high voltage electric equipment of solid shape
Survey.
Content of the invention：
In order to solve problems of the prior art, the present invention proposes a kind of local discharge of electrical equipment that is used for and detects
Device.
Technical scheme is as follows：
A kind of device for local discharge of electrical equipment detection, including：
Light source.
Fibre optic magnetic field sensor, described fibre optic magnetic field sensor includes the first optical fiber, bonder, Y waveguide, polarization beam splitting
Device, fiber optic loop, faraday rotator mirror, the first photodetector, the first input end of described bonder passes through the first optical fiber
It is connected with described light source, described fiber optic loop ring set is on conductor to be measured.
Electric field sensor of optic fibre, described electric field sensor of optic fibre include the second optical fiber, the first collimating lens, the polarizer, four
/ mono- wave plate, electro-optic crystal, analyzer, the second collimating lens, the second photodetector, the input of described first collimating lens
End is connected with described light source by described second optical fiber, and described electro-optic crystal is arranged on conductor side to be measured.
Signal processing unit, described signal processing unit respectively with described first photodetector, described second smooth electrical resistivity survey
Survey device to connect.
Wireless communication unit, described signal processing unit is connected with exterior terminal equipment by described wireless communication unit.
Preferred as technique scheme, in described fibre optic magnetic field sensor：
Second input of described bonder is connected with the input of described first photodetector by the first optical fiber, institute
The outfan stating bonder is connected with the input of described Y waveguide by described first optical fiber, the first outfan of described Y waveguide
It is connected with the first input end of described polarization beam apparatus by described first optical fiber, the second outfan of described Y waveguide passes through institute
State the first optical fiber to be connected with the second input of described polarization beam apparatus, described polarization beam apparatus pass through described first optical fiber and institute
The input stating fiber optic loop connects, and the outfan of described fiber optic loop passes through described first optical fiber and described faraday rotator mirror
Input connect.
Preferred as technique scheme, in described electric field sensor of optic fibre：
The input of described first collimating lens is connected with the input of the described polarizer by described second optical fiber, described
The outfan of the polarizer is connected with the input of described quarter-wave plate by described second optical fiber, described quarter-wave plate
Outfan be connected with the input of described electro-optic crystal by described second optical fiber, the outfan of described electro-optic crystal passes through institute
The input stating the second optical fiber with described analyzer is connected, and the outfan of described analyzer passes through described second optical fiber and described the
The input of two collimating lens connects, and the outfan of described second collimating lens passes through described second optical fiber and described second photoelectricity
The input of detector connects.
Preferred as technique scheme, described signal processing unit include amplify filter unit, peak value holding unit,
Data acquisition unit, Data Computation Unit.
Preferred as technique scheme, described light source adopts SLD light source.
Preferred as technique scheme, described faraday rotator mirror adopts ° faraday rotator mirror.
Preferred as technique scheme, described first photodetector and described second photodetector all adopt
PIN photodiode.
The beneficial effects of the present invention is：It passes through to arrange fibre optic magnetic field sensor and electric field sensor of optic fibre, can obtain
Take the electric field of conductor periphery to be measured and the polarity in magnetic field, and judge that shelf depreciation is believed according to the polarity of the electric field obtaining and magnetic field
Number the direction of propagation, detection sensitivity is high, good directionality, and strong antijamming capability is affected little, optical path loss is little by temperature change；
The fibre optic magnetic field sensor of its setting is capable of the reciprocity light path measurement of magnetic-field measurement, and degree of accuracy is high；It passes through to arrange signal
Processing unit and wireless communication unit, can be processed to the local discharge signal obtaining, and be sent out by wireless communication unit
Deliver to exterior terminal equipment, improve safety and the convenience of detection.This apparatus structure is simple and convenient to operate, degree of accuracy high,
Reliability is high.
Brief description：
The following drawings is only intended to, in doing schematic illustration and explanation to the present invention, not delimit the scope of the invention.Its
In：
Fig. 1 is a kind of apparatus structure schematic diagram for local discharge of electrical equipment detection of one embodiment of the invention；
Fig. 2 is the fibre optic magnetic field sensor structural representation of one embodiment of the invention；
Fig. 3 is the electric field sensor of optic fibre structural representation of one embodiment of the invention；
Fig. 4 is the signal processing unit structural representation of one embodiment of the invention.
In figure symbol description：
1- light source, 2- fibre optic magnetic field sensor, 3- electric field sensor of optic fibre, 4- signal processing unit, 5- radio communication list
Unit, 6- conductor to be measured, 201- first optical fiber, 202- bonder, 203-Y waveguide, 204- polarization beam apparatus, 205- fiber optic loop,
206- faraday rotator mirror, 207- first photodetector, 301- second optical fiber, 302- first collimating lens, 303- rises
Device partially, 304- quarter-wave plate, 305- electro-optic crystal, 306- analyzer, 307- second collimating lens, the smooth electrical resistivity survey of 308- second
Survey device, 401- amplifies filter unit, 402- peak value holding unit, 403- data acquisition unit, 404- Data Computation Unit, E- electricity
, F- magnetic field.
Specific embodiment：
As shown in figure 1, the device for local discharge of electrical equipment detection of the present invention, including：
Light source 1, described light source 1 adopts SLD light source.
Fibre optic magnetic field sensor 2, as shown in Fig. 2 described fibre optic magnetic field sensor 2 includes the first optical fiber 201, bonder
202nd, Y waveguide 203, polarization beam apparatus 204, fiber optic loop 205, faraday rotator mirror 206, the first photodetector 207, institute
The first input end stating bonder 202 is connected with described light source 1 by the first optical fiber 201, and described fiber optic loop 205 ring set is to be measured
On conductor 6.Second input of described bonder 202 passes through the input of the first optical fiber 201 and described first photodetector 207
End connects, and the outfan of described bonder 202 is connected with the input of described Y waveguide 203 by described first optical fiber 201, institute
The first outfan stating Y waveguide 203 is connected with the first input end of described polarization beam apparatus 204 by described first optical fiber 201,
Second outfan of described Y waveguide 203 is passed through described first optical fiber 201 and is connected with the second input of described polarization beam apparatus 204
Connect, described polarization beam apparatus 204 are connected with the input of described fiber optic loop 205 by described first optical fiber 201, described fiber optic loop
205 outfan is connected with the input of described faraday rotator mirror 206 by described first optical fiber 201.Described farad
Rotating mirror 206 adopts 90 ° of faraday rotator mirrors.Described first photodetector 207 adopts PIN photoelectricity two pole
Pipe.
Electric field sensor of optic fibre 3, as shown in figure 3, described electric field sensor of optic fibre 3 includes the second optical fiber 301, first collimate
Lens 302, the polarizer 303, quarter-wave plate 304, electro-optic crystal 305, analyzer 306, the second collimating lens 307, second
Photodetector 308, the input of described first collimating lens 302 is connected with described light source 1 by described second optical fiber 301,
Described electro-optic crystal 305 is arranged on conductor 6 side to be measured.The input of described first collimating lens 302 passes through described second light
Fine 301 are connected with the input of the described polarizer 303, and the outfan of the described polarizer 303 passes through described second optical fiber 301 and institute
The input stating quarter-wave plate 304 connects, and the outfan of described quarter-wave plate 304 passes through described second optical fiber 301
It is connected with the input of described electro-optic crystal 305, the outfan of described electro-optic crystal 305 passes through described second optical fiber 301 and institute
The input stating analyzer 306 connects, and the outfan of described analyzer 306 passes through described second optical fiber 301 and described second standard
The input of straight lens 307 connects, and the outfan of described second collimating lens 307 passes through described second optical fiber 301 and described the
The input of two photodetectors 308 connects.Described second photodetector 308 adopts PIN photodiode.
Signal processing unit 4, as shown in figure 4, described signal processing unit 4 respectively with described first photodetector 207,
Described second photodetector 308 connects.Described signal processing unit 4 includes amplifying filter unit 401, peak value holding unit
402nd, data acquisition unit 403, Data Computation Unit 404.
Wireless communication unit 5, described signal processing unit 4 passes through described wireless communication unit 5 with exterior terminal equipment even
Connect.
Working method：
S1：Using fibre optic magnetic field sensor obtain shelf depreciation Magnetic Field, the light that light source sends after bonder,
To Y waveguide, form two bunch polarized light, line polarized light is after polarization beam apparatus so that a branch of line polarized light direction rotates
Transmitted in a fiber with orthogonal modes with another bunch polarized light after 90 degree, through the fiber optic loop being in axial magnetic field, produce
Phase contrast, after 90 ° of faraday rotator mirrors, polarization mode exchanges the two bundle polarized light carrying phase information, returns to
It is in the fiber optic loop 5 in axial magnetic field, produce phase contrast again, the line polarized light of two bundle orthogonal modes is reverses through polarization beam splitting
After device, it is divided into the line polarisation of two bundle parallel model transmission, reach and interfere at Y waveguide, then by the first light after bonder
Electric explorer receives, the first photodetector the optical information flux with measured signal is converted to that computer can measure the
One signal of telecommunication, and this first signal of telecommunication is sent to signal processing unit.
S2：Obtain the electric field information of shelf depreciation using electric field sensor of optic fibre, the light that light source sends is through the first collimation
It is changed into directional light after lens, after the polarizer, is changed into line polarized light, then be changed into circularly polarized light after quarter-wave plate, such as
Fruit electro-optic crystal accessory conductor is disturbed by external voltage, then light wave will be changed into oval inclined from circularly polarized light after electro-optic crystal
Shake light, and this change procedure and electro-optic crystal receive the frequency of interference voltage signal and amplitude is relevant, after through analyzer and
It is divided into 2 bundle light waves to enter into the second photodetector after two collimating lens, the second photodetector can receive 2 linear polarizations
Interference signal after electro-optic crystal for the light wave, this optical signal is converted to second signal of telecommunication, and this second signal of telecommunication is sent
To signal processing unit.
S3：Signal processing unit is processed to first signal of telecommunication and second signal of telecommunication, obtains the biography of local discharge signal
Broadcast direction, and exterior terminal equipment is sent to by wireless communication unit.Because front traveling wave electric field is identical with the polarity in magnetic field, instead
Traveling wave electric field and the opposite polarity in magnetic field, so for the pulse signal along wire spread, its electric field and magnetic field are mutual
Association, for the positive pulse propagated in opposite direction, its electric field is all positive polarity, and the polarity in magnetic field is then just
On the contrary；For good fortune polar impulse, also there is similar situation.In a word, if the pulse of certain positive polarity is propagated from a direction
When, the polarity recording this pulse electric and magnetic field is all positive polarity, and the direction of propagation of now pulse is defined as forward direction, then
For the pulse of all forward-propagatings, regardless of its polarity, its electric field and magnetic field always same polarity；And for back propagation
Pulse, the polarity in its electric field and magnetic field is always contrary.The correspondence of the electric polarity according to pulse signal and polarity of the magnetic field is wide
West, by the polarity of fibre optic magnetic field sensor and electric field sensor of optic fibre output pulse signal initial peak it is possible to judge institute
Record the direction of propagation of pulse.
A kind of device for local discharge of electrical equipment detection described in the present embodiment, including：Light source, fibre optic magnetic field pass
Sensor, electric field sensor of optic fibre, signal processing unit, wireless communication unit.It passes through to arrange fibre optic magnetic field sensor and optical fiber
Electric-field sensor, can obtain the electric field of conductor periphery to be measured and the polarity in magnetic field, and the pole according to the electric field obtaining and magnetic field
Property judging the direction of propagation of local discharge signal, detection sensitivity is high, good directionality, and strong antijamming capability, by temperature change
Impact is little, and optical path loss is little；The fibre optic magnetic field sensor of its setting is capable of the reciprocity light path measurement of magnetic-field measurement, degree of accuracy
High；It passes through to arrange signal processing unit and wireless communication unit, the local discharge signal obtaining can be processed, and lead to
Cross wireless communication unit and be sent to exterior terminal equipment, improve safety and the convenience of detection.This apparatus structure is simple, behaviour
Make convenient, degree of accuracy height, reliability height.
Obviously, above-described embodiment is only intended to clearly illustrate example, and the not restriction to embodiment.Right
For those of ordinary skill in the art, can also make on the basis of the above description other multi-forms change or
Change.There is no need to be exhaustive to all of embodiment.And the obvious change thus extended out or
Change among still in the protection domain of the invention.
Claims (7)
1. a kind of device for local discharge of electrical equipment detection is it is characterised in that include：
Light source (1)；
Fibre optic magnetic field sensor (2), described fibre optic magnetic field sensor (2) includes the first optical fiber (201), bonder (202), Y ripple
Lead (203), polarization beam apparatus (204), fiber optic loop (205), faraday rotator mirror (206), the first photodetector
(207), the first input end of described bonder (202) is connected with described light source (1) by the first optical fiber (201), described optical fiber
Ring (205) ring set is on conductor to be measured；
Electric field sensor of optic fibre (3), described electric field sensor of optic fibre (3) includes the second optical fiber (301), the first collimating lens
(302), the polarizer (303), quarter-wave plate (304), electro-optic crystal (305), analyzer (306), the second collimating lens
(307), the second photodetector (308), the input of described first collimating lens (302) passes through described second optical fiber (301)
It is connected with described light source (1), described electro-optic crystal (305) is arranged on conductor side to be measured；
Signal processing unit (4), described signal processing unit (4) respectively with described first photodetector (207), described second
Photodetector (308) connects；
Wireless communication unit (5), described signal processing unit (4) passes through described wireless communication unit (5) and exterior terminal equipment
Connect.
2. the device for local discharge of electrical equipment detection according to claim 1 is it is characterised in that described optical fiber magnetic
In field sensor：Second input of described bonder (202) passes through the first optical fiber (201) and described first photodetector
(207) input connects, and the outfan of described bonder (202) passes through described first optical fiber (201) and described Y waveguide
(203) input connects, and the first outfan of described Y waveguide (203) passes through described first optical fiber (201) and described polarization point
The first input end of bundle device (204) connects, and the second outfan of described Y waveguide (203) passes through described first optical fiber (201) and institute
State polarization beam apparatus (204) second input connect, described polarization beam apparatus (204) pass through described first optical fiber (201) with
The input of described fiber optic loop (205) connects, and the outfan of described fiber optic loop (205) passes through described first optical fiber (201) and institute
The input stating faraday rotator mirror (206) connects.
3. the device for local discharge of electrical equipment detection according to claim 1 is it is characterised in that described optical fiber is electric
In field sensor：The input of described first collimating lens (302) passes through described second optical fiber (301) and the described polarizer
(303) input connects, and the outfan of the described polarizer (303) is by described second optical fiber (301) and described a quarter
The input of wave plate (304) connects, and the outfan of described quarter-wave plate (304) passes through described second optical fiber (301) and institute
The input stating electro-optic crystal (305) connects, the outfan of described electro-optic crystal (305) pass through described second optical fiber (301) with
The input of described analyzer (306) connects, and the outfan of described analyzer (306) passes through described second optical fiber (301) and institute
The input stating the second collimating lens (307) connects, and the outfan of described second collimating lens (307) passes through described second optical fiber
(301) it is connected with the input of described second photodetector (308).
4. the device for local discharge of electrical equipment detection according to claim 1 it is characterised in that：At described signal
Reason unit (4) includes amplifying filter unit (401), peak value holding unit (402), data acquisition unit (403), data calculating list
First (404).
5. the device for local discharge of electrical equipment detection according to claim 1 it is characterised in that：Described light source
(1) adopt SLD light source.
6. the device for local discharge of electrical equipment detection according to claim 1 it is characterised in that：Described faraday
Rotating mirror (206) adopts 90 ° of faraday rotator mirrors.
7. the device for local discharge of electrical equipment detection according to claim 1 it is characterised in that：Described first light
Electric explorer (207) and described second photodetector (308) are all using PIN photodiode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610866779.4A CN106405350A (en) | 2016-09-28 | 2016-09-28 | Device for partial discharge detection of electrical device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610866779.4A CN106405350A (en) | 2016-09-28 | 2016-09-28 | Device for partial discharge detection of electrical device |
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| Publication Number | Publication Date |
|---|---|
| CN106405350A true CN106405350A (en) | 2017-02-15 |
Family
ID=59229345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610866779.4A Pending CN106405350A (en) | 2016-09-28 | 2016-09-28 | Device for partial discharge detection of electrical device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110261688A (en) * | 2019-06-27 | 2019-09-20 | 中国电力科学研究院有限公司 | A kind of method and system of the wireless measurement of distortion electric field |
| CN112486035A (en) * | 2020-11-18 | 2021-03-12 | 上海电力大学 | Software and hardware simulation system for early fault research of transformer |
| CN110892595B (en) * | 2017-07-19 | 2021-08-17 | 株式会社藤仓 | Laser device and method for estimating light source degradation degree of laser device |
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| CN110892595B (en) * | 2017-07-19 | 2021-08-17 | 株式会社藤仓 | Laser device and method for estimating light source degradation degree of laser device |
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| CN112486035A (en) * | 2020-11-18 | 2021-03-12 | 上海电力大学 | Software and hardware simulation system for early fault research of transformer |
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