CN105425020A - Non-contact overvoltage photoelectric sensor based on double lithium niobate crystals - Google Patents
Non-contact overvoltage photoelectric sensor based on double lithium niobate crystals Download PDFInfo
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- CN105425020A CN105425020A CN201510811815.2A CN201510811815A CN105425020A CN 105425020 A CN105425020 A CN 105425020A CN 201510811815 A CN201510811815 A CN 201510811815A CN 105425020 A CN105425020 A CN 105425020A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16504—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed
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Abstract
The invention belongs to the technical field of high-voltage transmission line overvoltage monitoring, and discloses a non-contact overvoltage photoelectric sensor based on double lithium niobate crystals. The non-contact overvoltage photoelectric sensor comprises a non-contact sensor unit and a double-lithium niobate crystal photoelectric sensor unit. The non-contact sensor unit comprises a metal induction board and a low-voltage arm module. The metal induction board is arranged under an overhead transmission line. The low-voltage arm module is arranged between the metal induction board and the ground. The low-voltage arm module comprises a capacitor C2 of which one end is electrically connected with the metal induction board and the other end is grounded, and a voltage signal output end between the capacitor C2 and the metal induction board is electrically connected with the signal input end of the double-lithium niobate crystal photoelectric sensor unit. The device has a simple structure and small size, is not affected by temperature, is of high stability and measurement precision, and is convenient to control remotely, simple to install and easy to promote and apply. Conversion between optical and electrical signals is realized through an electro-optical effect. Remote signal transmission is implemented through an optical fiber. The non-contact overvoltage photoelectric sensor has the characteristics of small size, high response frequency, high resistance to electromagnetic interference, and the like.
Description
Technical field
The invention belongs to voltage Intellisense field, be specifically related to a kind of contactless superpotential photoelectric sensor.
Background interest
High-voltage fence over-voltage monitoring technology is for the superpotential behavioural characteristic of research and Insulation Coordination design, guarantee safe operation of power system has great importance, flourish along with electric system, the safe operation far reaching high-voltage fence over-voltage monitoring sensor for circuit on power system is more and more paid attention to.Traditional high-voltage voltage sensors carrying out measurement and relay protection to electric system is all adopt electromagnetic potential sensor (VT) and capacitance sensing type voltage sensor (CVT), due to the continuous increase of electrical power system transmission capacity and improving constantly of electric pressure, himself defect is as poor in antijamming capability, the problems caused with an electrical isolation difficulty etc. more manifest, more and more can not meet the needs of electric system engineering reality, therefore research and development are a kind of passive, accurately, antijamming capability is strong, the high-voltage fence overvoltage sensor of isolating with electrical equipment is extremely urgent.
The fast development of advanced optical technology makes numerous novel passive optical fibre voltage sensor enter into the sight line of people, existing many new problems took up to study novel passive optical fibre voltage sensor in recent years, and have developed the optical fibre voltage sensor OVS (OpticVoltageSensor) of various types, mainly can be divided into according to sensing principle: the passive OVS of light transmission type, active OVS, all-fiber OVS and the OVS based on electrostriction principle.It is high that this type of optical fibre voltage sensor has measuring accuracy, response band is wide, the many merits such as anti-electromagnetic interference capability is strong, volume is little, but it is not isolated with an electrical equipment, the fault of sensor itself may cause the fault of whole electrical network, and this is that major hidden danger has been buried in the safe operation of grid equipment.Along with the development of photoelectric technology, photoelectric sense technology extremely strong for antijamming capability applied on high-voltage fence over-voltage monitoring and become possibility, the high-low pressure that utilizes as University Of Chongqing's independent research is coupled partial pressure unit and have the electro-optic crystal (LiNbO of an electrooptical effect and Pockels effect
3) carry out electro-optic conversion, realize running at Practical Project field pilot test the contactless superpotential photoelectric sensor of high-voltage fence over-voltage monitoring, this, for the development advancing the passive monitoring technology of high-voltage fence superpotential, makes monitoring technology safety and reliability have considerable meaning.
After preliminary performance test is carried out based on the contactless superpotential photoelectric sensor of single lithium columbate crystal to this kind, we find this kind of photoelectric sensor have passive, the response time is fast, anti-interference strong and with the many merits of electrical primary equipment blocking, but responsive especially to temperature variation, by after device one by one Exclusion analysis, we obtain core---the lithium niobate (LiNbO of the single lithium columbate crystal photoelectric sensor based on Pockels effect
3) crystal, due to the characteristic of himself, not only for electric field-sensitive, temperature, pressure and additional birefringence etc. all apply material impact to the crystal refractive index, Crystals in Symmetry type etc. of lithium columbate crystal, make by LiNbO
3the phase differential that natural crystal birefringence causes is subject to very big interference.But in transverse electric optical modulation, LiNbO
3the phase differential that natural crystal birefringence causes determines LiNbO
3the quiescent point of crystal, floating of crystal shunt working point will cause sensor to be stabilized in LiNbO
3in crystal linear work district, have a strong impact on measurement and the precision of electro-optical device, thus affect its optical characteristics further.Therefore, in order to will based on electro-optic crystal (LiNbO
3) photoelectric sense technology of pockels effect applies to high-voltage fence over-voltage monitoring field, just a kind of little by environment temperature interference in the urgent need to researching and developing, the novel non-contact superpotential photoelectric sensor of stable performance.
Summary of the invention
In view of this, the invention provides a kind of contactless superpotential photoelectric sensor based on two lithium columbate crystal, do not affect by variation of ambient temperature, isolate with a power equipment, measuring accuracy is high, and Signal transmissions is easy.
The present invention is solved the problems of the technologies described above by following technological means:
Comprise noncontact sensing unit and two lithium columbate crystal photoelectric sensing unit;
Described noncontact sensing unit comprises metal tablet and low-voltage arm module, and under described metal tablet is used for being arranged on overhead transmission line, low-voltage arm module installation is between metal tablet and ground, and low-voltage arm module comprises electric capacity C
2, described electric capacity C
2one end be electrically connected with metal tablet, other end ground connection, electric capacity C
2be electrically connected with the signal input part of the voltage signal output end between metal tablet with two lithium columbate crystal photoelectric sensing unit.
Further, the described contactless overvoltage sensor based on two lithium columbate crystal also comprises Metal shielding shell, metal tablet is fixed on above Metal shielding shell by insulated screw and insulation spacer, Metal shielding shell ground connection, low-voltage arm module and two lithium columbate crystal photoelectric sensing unit are arranged in Metal shielding shell.
Further, the light path of described pair of lithium columbate crystal photoelectric sensing unit comprises optical fiber collimator, optical polariser, quarter wave plate, LiNbO successively
3crystal I, pi/2 optical rotation plate, LiNbO
3crystal II, optics analyzer, optical fiber collimator;
LiNbO
3crystal I and LiNbO
3the upper and lower surface of crystal II is all coated with metal electrode, described LiNbO
3crystal II putting position and LiNbO
3the identical Z axis of X-axis of crystal I is contrary;
Described LiNbO
3crystal I and LiNbO
3phase the same side, metal electrode orientation of crystal II and the electric capacity C of low-voltage arm module
2be electrically connected with the voltage signal output end between metal tablet, two LiNbO
3crystal opposite side metal electrode ground connection.
Beneficial effect of the present invention: the contactless overvoltage sensor based on electrooptical effect of the present invention, relative to prior art, tool has the following advantages:
This device develops based on bicrystal temperature compensation act, has influenced by ambient temperature minimum, the feature of stable performance.
This device volume is little, and structure is simple, and be convenient to install, Signal transmissions is simple and easy, facilitates Long-distance Control, is applicable to product batch and promotes.
The features such as this device can realize signal long-distance transmissions by photoelectric conversion technique, and measuring accuracy is high, fast response time, and frequency domain is wide, and anti-electromagnetic interference capability is strong.
This device, by noncontact sensing unit, achieves the electrical isolation of sensor and primary equipment, can accurately measure the safe operation that overvoltage signal can ensure again power equipment.
This device, by all-fiber coupling denoising and back-end software signal transacting, realizes the high-acruracy survey of weak electric signal.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is the contactless superpotential photosensor structure schematic diagram based on two lithium columbate crystal in apparatus of the present invention;
Fig. 2 is the structural representation of two lithium columbate crystal photoelectric sensing unit in apparatus of the present invention;
Fig. 3 is two lithium columbate crystal temperature compensation act principle schematic in apparatus of the present invention;
Fig. 4 is the structural representation that apparatus of the present invention are applied to UHV transmission line.
Embodiment
Below with reference to accompanying drawing, the present invention is described in detail.
See Fig. 1-4, based on the contactless superpotential photoelectric sensor of two lithium columbate crystal, comprise Metal shielding shell 11, noncontact sensing unit and two lithium columbate crystal photoelectric sensing unit 12, described noncontact sensing unit comprises metal tablet 13 and low-voltage arm module 14, described metal tablet 13 is long 490mm, wide 270mm, the metal foil of thick 2mm, surfaces externally and internally all scribbles waterproof insulation paint, has stronger corrosion resistance and physical strength.Described Metal shielding shell 11 is the rectangular parallelepiped of upper end open, and material used is metallic steel, and the parallel 15mm that stretches out of edge of opening steel plate, for installing insulating pad 16, insulated screw 15 and metal tablet 13.Metal shielding shell 11 inner length is 460mm, and inner width is 240mm, and internal height is 100mm, and steel plate thickness is 2mm.Described insulation spacer 16 is wooden or the insulating material such as plastic material.Insulation spacer 16 is installed on the steel plate that Metal shielding shell 11 edge of opening extends in parallel laterally, and is drilled with screw.Metal tablet 13 is fixed on above Metal shielding shell 11 and insulation spacer 16 by insulated screw 15, the effect that insulation spacer 16 plays insulation and supports.Metal shielding shell 11 ground connection, low-voltage arm module 14 and two lithium columbate crystal photoelectric sensing unit 12 are arranged in Metal shielding shell.
Described low-voltage arm module is by electric capacity C
2, build-out resistor, the composition such as discharging gap, encapsulate with acrylic board PMMA, length is 60mm, and width is 45mm, is highly 20mm.Low-voltage arm module installation below metal tablet 1, C in low-voltage arm module
2one end be electrically connected with metal tablet 1, other end ground connection.
Described low-voltage arm module 14 low-voltage arm module acrylic board PMMA encapsulates, and length is 60mm, and width is 45mm, is highly 20mm.Between metal tablet 13 and ground, low-voltage arm module 14 comprises electric capacity C
2and peripheral circuit, as build-out resistor etc., described electric capacity C
2one end be electrically connected with metal tablet 13, other end ground connection, electric capacity C
2be electrically connected with the signal input part of the voltage signal output end between metal tablet 13 with two lithium columbate crystal photoelectric sensing unit 12.
See Fig. 2, the light path of described pair of lithium columbate crystal photoelectric sensing unit comprises successively optical fiber collimator 4, optical polariser 5, quarter wave plate 6, LiNbO
3crystal 7, pi/2 optical rotation plate 8, LiNbO
3crystal 9, optics analyzer 10, optical fiber collimator 11;
LiNbO
3crystal 7 and LiNbO
3the upper and lower surface of crystal 9 is all coated with metal electrode, described LiNbO
3crystal 9 putting position and LiNbO
3the identical Z axis of X-axis of crystal 7 is contrary;
Described LiNbO
3crystal 7 and LiNbO
3phase the same side, metal electrode orientation of crystal 9 is the signal input part of two lithium columbate crystal photoelectric sensing unit, with the electric capacity C of low-voltage arm module
2be electrically connected by concentric cable with the voltage signal output end between metal tablet, two LiNbO
3crystal opposite side metal electrode ground connection.
Optical fiber collimator 4 is connected with lasing light emitter 1 by optical fiber, and optical fiber collimator 11 is connected with PD photodetector 2 by optical fiber.
The voltage signal modulation that low-voltage arm exports by two lithium columbate crystal photoelectric sensing unit in light signal, and carries out data transmission by multimode optical fiber.
See Fig. 4, the stray capacitance C between overhead transmission line and metal tablet 13
1and the electric capacity C of low-voltage arm module between metal tablet 13 and ground
2form capacitances in series bleeder circuit, the high voltage signal on overhead transmission line is converted to the low voltage signal that low-voltage arm module 14 exports and measures.Meanwhile, the screening can ground connection of metal tablet 13, shields the interference of the relative overvoltage sensor of other non-measured.High voltage signal is transferred to derided capacitors from metal tablet 13, guides concentric cable into through build-out resistor.
According to Circuit theory, metal tablet 13 is derided capacitors C over the ground
2on voltage u
2(t) be:
In formula, u
1t () is line voltage, K is intrinsic standoff ratio.Due to stray capacitance C
1size and metal tablet 13 and the distance of overhead transmission line, the diameter of overhead transmission line and to respond to the physical dimension of sheet metal relevant.And derided capacitors C
2for fixed value.Therefore once metal tablet installation site, physical dimension and derided capacitors are determined, then intrinsic standoff ratio K is constant, metal tablet voltage-to-ground and line voltage linear.
Described pair of lithium columbate crystal photoelectric sensing unit is arranged in Metal shielding shell 2.See Fig. 2, the light path of described pair of lithium columbate crystal photoelectric sensing unit comprises successively optical fiber collimator 4, LiNbO that optical polariser 5, quarter wave plate 6, upper and lower sides are coated with metal electrode respectively
3crystal 7, pi/2 optical rotation plate 8, upper and lower sides are coated with metal electrode and putting position and LiNbO respectively
3the LiNbO that the identical Z axis of X-axis of crystal 7 is contrary
3crystal 9, optics analyzer 10, optical fiber collimator 11, described LiNbO
3crystal 7 and LiNbO
3phase the same side, metal electrode orientation of crystal 9 simultaneously with the electric capacity C of low-voltage arm module
2be electrically connected with the voltage signal output end between metal tablet 1, two LiNbO
3crystal opposite side metal electrode is ground connection simultaneously;
Optical fiber collimator 4, optical polariser 5, quarter wave plate 6, upper and lower sides are coated with the LiNbO of metal electrode respectively
3crystal 7, pi/2 optical rotation plate 8, upper and lower sides are coated with metal electrode and putting position and LiNbO respectively
3the LiNbO that the identical Z axis of X-axis of crystal 7 is contrary
3it is 150mm that crystal 9, optics analyzer 10, optical fiber collimator 11 are encapsulated as a length, and width is 25mm, is highly the module of 25mm.
See Fig. 3, bicrystal temperature compensation act is employing two pieces of identical LiNbO of geometric configuration size
3crystal 7,9, LiNbO
3crystal is rectangular parallelepiped, take length direction as optical direction, i.e. x-axis; Make their optical axises (z-axis) direction contrary, two LiNbO
3insert one piece of optical rotation plate 8 between crystal, effect is the plane of polarization half-twist making polarized light, electric field
parallelly put on LiNbO
3the z direction of crystal, d is LiNbO
3the thickness of crystal, V is noncontact sensing unit output voltage, incident light is linearly polarized light, and plane of polarization and optical axis of crystal angle at 45 °, after impinging perpendicularly on plane of crystal, be decomposed into two components that amplitude is equal, one is the e light of direction of vibration along z-axis, and one is the o light of direction of vibration along y-axis, after pi/2 optical rotation plate, the vibration plane of two-beam have rotated 90 ° around x-axis, and e light originally enters second piece of crystal and just becomes the o light of direction of vibration in y-axis.Equally, another bundle polarized light is that direction of vibration, along the o light of y-axis, becomes the e light of direction of vibration along z-axis after entering second piece of crystal in first piece of crystal, and the change of temperature can to two pieces of LiNbO
3the phase differential that natural crystal birefringence causes produces contrary impact, due to two pieces of LiNbO
3crystal length is equal, and the phase differential that in the great two pieces of crystal of temperature influence, natural birefringence causes is just in time complementary, and this just reaches, and the fluctuation of suppression sensor for temperature is very responsive, the object of stability sensor quiescent point.
Lasing light emitter 1 and PD photodetector 2 can be arranged on pulpit, laser that lasing light emitter 1 sends through by polarization maintaining optical fibre long range propagation to two lithium columbate crystal photoelectric sensing unit 12, laser after optical fiber collimator 4 collimation successively vertical sand shooting enter optical polariser 5, quarter wave plate 6, LiNbO
3crystal 7, pi/2 optical rotation plate 8, LiNbO
3crystal 9, optics analyzer 10, optical fiber collimator 11, realize electrooptical modulation.Described optical polariser 5 profile is square, and length is 10mm, and width is 10mm, is highly 10mm, and clear aperature is Φ 4mm, and applicable wavelengths is 1550nm.Described pi/2 optical rotation plate profile is rectangular parallelepiped, and length is 1mm, and width is 10mm, is highly 10mm.Described LiNbO
3crystal 7 and LiNbO
3crystal 9 profile is rectangular parallelepiped, and length is 30mm, and width is 4mm, and be highly 3mm, this crystal has Pockels electrooptical effect, and the voltage signal that noncontact sensing unit is responded to is added in the upper and lower two ends of crystal by metal electrode.Described quarter wave plate 6 profile is rectangular parallelepiped, and length is 0.8mm, and width is 10mm, is highly 10mm, and clear aperature is Φ 4mm, and applicable wavelengths is 1550nm.Described optics analyzer 10 profile is rectangular parallelepiped, and length is 10mm, and width is 10mm, is highly 10mm, and clear aperature is Φ 4mm, and applicable wavelengths is 1550nm.Laser after electrooptical modulation is coupled into multimode optical fiber by module tail end optical fiber collimator 11 and long range propagation carries out opto-electronic conversion analysis to PD photodetector 2, finally realizes the superpotential monitoring of transmission line of electricity.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (3)
1. based on the contactless superpotential photoelectric sensor of two lithium columbate crystal, it is characterized in that: comprise noncontact sensing unit and two lithium columbate crystal photoelectric sensing unit;
Described noncontact sensing unit comprises metal tablet and low-voltage arm module, and under described metal tablet is used for being arranged on overhead transmission line, low-voltage arm module installation is between metal tablet and ground, and low-voltage arm module comprises electric capacity C
2, described electric capacity C
2one end be electrically connected with metal tablet, other end ground connection, electric capacity C
2be electrically connected with the signal input part of the voltage signal output end between metal tablet with two lithium columbate crystal photoelectric sensing unit.
2. as claimed in claim 1 based on the contactless overvoltage sensor of two lithium columbate crystal, it is characterized in that: the described contactless overvoltage sensor based on two lithium columbate crystal also comprises Metal shielding shell, metal tablet is fixed on above Metal shielding shell by insulated screw and insulation spacer, Metal shielding shell ground connection, low-voltage arm module and two lithium columbate crystal photoelectric sensing unit are arranged in Metal shielding shell.
3. the contactless superpotential photoelectric sensor based on two lithium columbate crystal according to any one of claim 1-2, is characterized in that: the light path of described pair of lithium columbate crystal photoelectric sensing unit comprises optical fiber collimator, optical polariser, quarter wave plate, LiNbO successively
3crystal I, pi/2 optical rotation plate, LiNbO
3crystal II, optics analyzer, optical fiber collimator;
LiNbO
3crystal I and LiNbO
3the upper and lower surface of crystal II is all coated with metal electrode, described LiNbO
3crystal II putting position and LiNbO
3the identical Z axis of X-axis of crystal I is contrary;
Described LiNbO
3crystal I and LiNbO
3phase the same side, metal electrode orientation of crystal II and the electric capacity C of low-voltage arm module
2be electrically connected with the voltage signal output end between metal tablet, two LiNbO
3crystal opposite side metal electrode ground connection.
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| CN109001517A (en) * | 2018-05-02 | 2018-12-14 | 上海大学 | It is a kind of based on all -fiber voltage sensing device for mixing manganese silica fibre |
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