CN103443639A - Current measurement system, optical current transformer and fixing device thereof, light signal sampler and method thereof - Google Patents
Current measurement system, optical current transformer and fixing device thereof, light signal sampler and method thereof Download PDFInfo
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- CN103443639A CN103443639A CN201280001221XA CN201280001221A CN103443639A CN 103443639 A CN103443639 A CN 103443639A CN 201280001221X A CN201280001221X A CN 201280001221XA CN 201280001221 A CN201280001221 A CN 201280001221A CN 103443639 A CN103443639 A CN 103443639A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
- G01R15/245—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect
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Abstract
Provided includes a current measurement system for measuring the current in the lead wire, an optical current transformer and a fixing device thereof, a light signal sampler and a method thereof. The measurement system comprises a optical current transformer, the light signal sampler and a controller. The optical current transformer generates light signal corresponding to the current by utilizing a magnetic field produced by the current. The light signal sampler comprises a photoelectric conversion interface unit which converts the light signals to electric signals which comprises DC component signals and AC component signals, a DC component processing component which obtains the DC component signals, an AC component processing unit which obtains the AC component signals from the electric signals through subtracting the DC component signals from the electric signals, and a analog-digital conversion unit which converts the AC component signals to the digital AC component signals. The controller obtains the current measurement value through multiplying the digital AC component signals by correction coefficient.
Description
Technical field
The present invention relates to the field of intelligent grid, and relate more specifically to a kind of for example, current measurement system, the optical current mutual inductor used and light signal sampling thief for the electric current in intelligent grid measure traverse line (, power transmission line) in this current measurement system, for optical current mutual inductor being fixed to stationary installation on wire and corresponding method.
Background technology
In electrical network, need to measure for various purposes the electric current in power transmission line.In traditional current measurement system, carry out the measurement of electric current with electromagnetic current transducer.Yet electromagnetic current transducer exists such as defects such as insulation system are complicated, volume is large, security performance is low.Therefore, the current measurement system based on optical current mutual inductor has been proposed.Optical current mutual inductor utilizes Faraday effect to carry out the measurement of electric current, that is, the magnetic field that utilizes the electric current in power transmission line to produce produces the light signal corresponding with this electric current, and, by this light signal is sampled and processed, determines described electric current.With electromagnetic current transducer, compare, optical current mutual inductor has the advantages such as volume is little, simple in structure, anti-interference is good, security performance is good.
Yet, in traditional current measurement system based on optical current mutual inductor, for the light signal sampling thief that light signal is sampled, there are the problems such as the low and phase error of sampling precision is large, this has limited the range of application of this current measurement system.Therefore, need a kind of new current measurement system, it can measure the electric current in transmission line with higher precision and less phase error.
Summary of the invention
Consider above problem and made the present invention.An object of the present invention is to provide a kind of current measurement system, it can improve the sampling precision when light signal of optical current mutual inductor output is sampled and reduce phase error, thereby with the electric current in higher precision measure wire.Another object of the present invention is to provide optical current mutual inductor and stationary installation, light signal sampling thief and the corresponding method of using in described current measurement system.
According to an aspect of the present invention, provide a kind of current measurement system of the electric current for measure traverse line, having comprised: optical current mutual inductor, the magnetic field that utilizes described electric current to produce, produce the light signal corresponding with this electric current; Light signal sampling thief and controller, described light signal sampling thief comprises: the photoelectric conversion interface unit, described light signal is converted to electric signal, this electric signal comprises DC component signal and AC compounent signal; The DC component treatment unit extracts the DC component signal from described electric signal; The AC compounent processing unit by by described electric signal and described DC component signal subtraction, extracts the AC compounent signal from described electric signal; And AD conversion unit, described AC compounent signal is converted to the Digital AC component signal; Described controller is multiplied by correction coefficient by described Digital AC component signal, thereby obtains the measured value of described electric current.
According to a further aspect in the invention, provide a kind of optical current mutual inductor, the corresponding light signal for generation of the electric current with in wire, this optical current mutual inductor comprises: optical transmitting set, the light that emission is propagated along first direction; The mutual inductance unit comprises: the first polarizer, and its optical axis is on first direction, and described light passes this first polarizer to become linearly polarized light; The first reverberator, reflex to second direction by described linearly polarized light from first direction; The magnetic induction device, be disposed in described magnetic field, and its optical axis is on second direction, and the light reflected, through this magnetic induction device, makes polarization direction deflect; The second reverberator, will reflex to third direction from second direction from the light of magnetic induction device outgoing; And second polarizer, its optical axis on third direction, the linearly polarized light reflected through this second polarizer as described light signal; The angle of the polarization direction of wherein said the first polarizer and described the second polarizer is 45 °, and described second direction is different with described third direction from described first direction.
According to another aspect of the present invention, a kind of light signal sampling thief is provided, and for light signal is sampled, this light signal sampling thief comprises: the photoelectric conversion interface unit, described light signal is converted to electric signal, and this electric signal comprises DC component signal and AC compounent signal; The DC component treatment unit extracts the DC component signal from described electric signal; The AC compounent processing unit by by described electric signal and described DC component signal subtraction, extracts the AC compounent signal from described electric signal; And AD conversion unit, described AC compounent signal is converted to the Digital AC component signal.
According to another aspect of the present invention, a kind of stationary installation is provided, be used for the mutual inductance cellular installation of optical current mutual inductor to wire, this stationary installation comprises: container is installed, there is the first arm and the second arm that are perpendicular to one another, there is the groove that holds wire on the first arm, at the second arm, on a side contrary with described groove, have for the cavity of described mutual inductance unit is installed, wherein, described mutual inductance unit is installed in cavity, makes the optical axis of the magnetic induction medium in this mutual inductance unit vertical with the direction of current in wire; And at least one fixture, for wire is fixed to groove.
According to another aspect of the present invention, provide a kind of method of sampling of light signal, for light signal is sampled, this light signal method of sampling comprises: described light signal is converted to electric signal, and this electric signal comprises DC component signal and AC compounent signal; Extract the DC component signal from described electric signal; By by described electric signal and described DC component signal subtraction, extract the AC compounent signal from described electric signal; With described AC compounent signal is converted to the Digital AC component signal.
The accompanying drawing explanation
Embodiments of the present invention is described in detail in conjunction with the drawings, and above and other objects of the present invention, feature, advantage will become apparent, wherein:
Fig. 1 is the schematic diagram of Faraday effect;
Fig. 2 is the block diagram of the schematically illustrated current measurement system according to the embodiment of the present invention.
Fig. 3 is the figure of the schematically illustrated optical current mutual inductor according to first embodiment of the invention.
Fig. 4 is the figure of the schematically illustrated optical current mutual inductor according to second embodiment of the invention.
Fig. 5 is the figure of the schematically illustrated optical current mutual inductor according to third embodiment of the invention.
Fig. 6 is the block diagram according to the light signal sampling thief of the embodiment of the present invention.
Fig. 7 is the exemplary circuit figure according to the light signal sampling thief of the embodiment of the present invention.
Fig. 8 is fixed to the overall perspective of the stationary installation on wire according to the embodiment of the present invention for the mutual inductance unit by optical current mutual inductor.
Fig. 9 is the partial enlarged drawing according to the stationary installation of the embodiment of the present invention.
Figure 10 is the skeleton view of the mutual inductance cellular installation container shown in Fig. 9 while seeing from oblique upper.
Figure 11 is the skeleton view of the mutual inductance cellular installation container shown in Fig. 9 while seeing from oblique below.
Figure 12 is mutual inductance cellular installation container that the mutual inductance unit the has been installed skeleton view while seeing from oblique below.
Figure 13 is the skeleton view of the fixture shown in Fig. 9.
Figure 14 is the skeleton view of the stator shown in Fig. 9.
Embodiment
Describe according to embodiments of the invention below with reference to accompanying drawings.In the accompanying drawings, identical reference number means identical element from start to finish.
At first, brief description principle of the present invention.
The present invention has utilized Faraday effect.Fig. 1 is the schematic diagram of Faraday effect.Particularly, when linearly polarized light during at Propagation, if be parallel to the direction of propagation of light, this medium is applied to magnetic field, the polarisation of light direction will deflect, and deflection angle β is directly proportional to the product that magnetic induction density B and the light in magnetic field pass through the length d of medium in magnetic field, be β=V * B * d, scale-up factor V is called Verdet constant, and it is relevant with medium character and light frequency.The direction of deflection depends on medium character and magnetic direction.
When alternating current for example, flows in wire (power transmission line in electrical network), produce alternating magnetic field around wire, and the magnetic induction density B of this alternating magnetic field is along with the alternating current linear change in wire.The present invention utilizes this magnetic field, produces the light signal corresponding with electric current in wire based on Faraday effect.
Particularly, the light that optical transmitting set is sent is through the first polarizer (polarizer), and to become linearly polarized light, (its light intensity is made as I
0), and make this linearly polarized light pass the magnetic induction medium along magnetic direction, make its polarization direction deflection angle β.Then, make to pass the second polarizer (analyzer) from the light of magnetic induction medium outgoing.Suppose that the angle between the light transmission shaft of the first polarizer and the second polarizer is θ, according to Malus law, from the light intensity I of the second polarizer outgoing be:
I=I
0cos
2(θ+β) （1）
When θ=π/4, above formula (1) can be written as:
I=I
0cos
2(π/4+β)=0.5×I
0(1-sin2β) （2）
Because deflection angle β is very little usually, therefore above formula (2) can be reduced to
I=0.5×I
0(1-sin2β)≈0.5×I
0(1-2β)=0.5I
0-I
0(V×B×d) （3）
Known according to formula (3), the light intensity I of emergent light comprises constant portion (0.5I
0) and along with the changing unit (I of magnetic induction density B linear change
0(V * B * d)).Because magnetic induction density B is directly proportional to the electric current in wire, therefore, emergent light comprises the first optical signal component that light intensity is constant and light intensity the second optical signal component along with the electric current linear change in wire.
Light signal by outgoing is converted to electric signal (for example voltage signal), can obtain comprise the DC component signal corresponding with the first optical signal component and with the electric signal of the corresponding component signal of the second optical signal component, wherein, described AC compounent signal along with the alternating current in wire linear change.Then, by extracting described AC compounent signal and it is multiplied by correction coefficient from electric signal, can determine the alternating current in wire.
Below, with reference to accompanying drawing, the current measurement system according to the embodiment of the present invention is described.
Fig. 2 shows the block diagram according to the current measurement system of the embodiment of the present invention.As shown in Figure 2, current measurement system 10 comprises optical current mutual inductor 11, light signal sampling thief 12 and controller 13.
Optical current mutual inductor 11 utilizes the magnetic field of the electric current generation of transmitting in wire, produces the light signal corresponding with this electric current.As described above, this light signal comprises the first optical signal component that light intensity is constant and light intensity the second optical signal component along with the alternating current linear change in wire.
Light signal sampling thief 12 is converted to electric signal by the light signal of optical current mutual inductor 11 outputs, and this electric signal comprises the DC component signal corresponding with the first optical signal component and the AC compounent signal corresponding with the second optical signal component.Described electric signal is preferably voltage signal.Then, light signal sampling thief 12 extracts described AC compounent signal from electric signal.Preferably, light signal sampling thief 12 is converted to the Digital AC signal by extracted AC compounent signal.
Below, at first describe optical current mutual inductor 11 in detail.
Fig. 3 shows the first embodiment of optical current mutual inductor 11.As shown in Figure 3, optical current mutual inductor 11 comprises optical transmitting set 111, the first optical fiber 112, the first collimation lens 113, the first polarizer 114, magnetic induction medium 115, the second polarizer 116, the second collimation lens 117 and the second optical fiber 118.
The optical axis of the first collimation lens 113, the first polarizer 114, magnetic induction device 115, the second polarizer 116 and the second collimation lens 117 is on the same straight line.The first optical fiber 112 1 ends are coupled to optical transmitting set 111, and the other end is positioned near the focus place or focus of the first collimation lens 113, and the second optical fiber 118 1 ends are positioned near the focus place or focus of the second collimation lens 117, and the other end is connected to light signal sampling thief 12.
Pass the second polarizer 116 from the light of magnetic induction device 115 outgoing.As described above, light beam with respect to 114 outgoing during the first polarization, from the light beam light intensity of the second polarizer 116 outgoing, variation has occurred, thereby form the light signal corresponding with electric current in wire, this light signal comprises the first optical signal component that light intensity is constant and light intensity the second optical signal component along with the alternating current linear change in wire.
Described light beam (light signal) is converged near its focus place or focus by the second collimation lens 117, thereby is coupled in the second optical fiber 118.The second optical fiber 118 then by this light signal transduction to light signal sampling thief 12.
The first and second collimation lenses, the first and second polarizers and magnetic induction device can be packaged together, to form the mutual inductance unit, and the first optical fiber and the second optical fiber stretch out from the both sides of mutual inductance unit respectively.For example, can use the shell by preferably the lighttight magnetic-permeable material of corrosion-and high-temp-resistant (such as engineering plastics PEEK, ABS etc.) is made to carry out this encapsulation.This shell can be right cylinder or rectangular parallelepiped.This mutual inductance unit is arranged such that the direction in the magnetic field that the electric current in wire produces is identical with the optical axis direction of magnetic induction device, in other words, makes wire vertical with the optical axis of magnetic induction device.Can use according to the stationary installation of the embodiment of the present invention described mutual inductance unit is fixed on wire.To describe this stationary installation in detail after a while.
In the present embodiment, due to the optical axis of the first and second collimation lenses, the first and second polarizers and magnetic induction device on the same straight line, this makes the size of optical current mutual inductor (mutual inductance unit particularly) on magnetic induction device optical axis direction larger.In order to reduce this size, the optical current mutual inductor according to second embodiment of the invention and the 3rd embodiment has been proposed.
Fig. 4 shows the optical current mutual inductor 11 according to second embodiment of the invention.This optical current mutual inductor is identical with the optical current mutual inductor major part shown in Fig. 3.For the sake of simplicity, the difference of the two is only described here.
Except each assembly shown in Fig. 3, according to the optical current mutual inductor 11(of second embodiment of the invention in the mutual inductance unit) also comprise the first reverberator 119 and the second reverberator 120.In the present embodiment, the optical axis of the first collimation lens 113 and the first polarizer 114 is in first direction (on same straight line), the optical axis of magnetic induction device 115 (being magnetic direction) is in second direction, the optical axis of the second polarizer 116 and the second collimation lens 117 is in third direction (on same straight line), wherein first direction is different from second direction, third direction is also different from second direction, this optical axis of each assembly that makes the mutual inductance unit is no longer on same straight line, thereby reduced the size of optical current mutual inductor (mutual inductance unit) on the optical axis direction of magnetic induction device.Preferably, as shown in Figure 4, first direction is vertical with second direction respectively with third direction, makes the optical axis of the optical axis of collimation lens and polarizer perpendicular to the magnetic induction device, farthest to reduce described size.
In the present embodiment, the first reverberator 119 will reflex to second direction from first direction through the direction of propagation of the light beam of the first polarizer 114, makes it enter magnetic induction device 115.The second reverberator 120 will reflex to third direction from second direction from the direction of propagation of the light beam of magnetic induction device 115 outgoing, and through the second polarizer 116 and the second collimation lens 117, and be coupled in the second optical fiber 118.
Fig. 5 shows the optical current mutual inductor 11 according to third embodiment of the invention.Optical current mutual inductor difference shown in this optical current mutual inductor and Fig. 4 is the relative position of the first polarizer 114 and the first reverberator 119 and the relative position of the second polarizer 116 and the second reverberator 120.Here, only the two difference is described.
In the present embodiment, the optical axis of the first collimation lens 113 is (on same straight line) on first direction, the first and second polarizers 114 and 116 and the optical axis (on same straight line) on second direction of magnetic induction device 115, the optical axis of the second collimation lens is (on same straight line) on third direction, wherein first direction is different from second direction, and third direction is also different from second direction.Equally, this has reduced the size of mutual inductance unit on the optical axis direction of magnetic induction device.Preferably, as shown in Figure 5, first direction is vertical with second direction respectively with third direction, makes the optical axis of collimation lens vertical with the optical axis of magnetic induction device with polarizer, farthest to reduce described size.
In the present embodiment, the first reverberator 119 will reflex to second direction from first direction from the direction of propagation of the light beam of the first collimation lens 113 outgoing, make it pass the first polarizer 114, magnetic induction device 115 and the second polarizer 116.Then, this light beam is reflexed to third direction from second direction by the second reverberator 120, thereby, through the second collimation lens 117, then is coupled in the second optical fiber 118.
A plurality of embodiment of optical current mutual inductor have been described hereinbefore.Will be appreciated that, can carry out various modifications to these embodiment, and not deviate from scope of the present invention.For example, used hereinbefore optical fiber, this is because optical fiber has good flexiblely, and allows conduct far light, but also can carry out light conducting with other light conductive mediums.In addition, used in the above-described embodiments the first and second collimation lenses, but in the situation that the optical transmitting set emitting parallel light, also can omit they one of or all.In addition, in the situation that use the linear polarization light source, can also omit the first polarizer.
As mentioned above, light signal sampling thief 12 is converted to electric signal by the light signal of optical current mutual inductor 11 outputs, extracts the AC compounent signal from this electric signal, and preferably is converted into the Digital AC signal.Below, with reference to Fig. 6, light signal sampling thief 12 is described.
As shown in Figure 6, light signal sampling thief 12 comprises photoelectric conversion interface unit 121, DC component treatment unit 122, AC compounent processing unit 123 and A/D converting unit 124.
Photoelectric conversion interface unit 121 receives the light signal of the second optical fiber 118 conduction, and this light signal is converted to electric signal, voltage signal for example, and provide it to DC component treatment unit 122 and AC compounent processing unit 123.For example, photoelectric conversion interface unit 121 can comprise the described light signal of reception and be converted into the photoelectric switching circuit (not shown) of current signal and the current-to-voltage converting circuit (not shown) that described current signal is converted to voltage signal.As described above, this electric signal comprises DC component signal and AC compounent signal, and wherein the electric current in this AC compounent signal and wire (power transmission line) is linear.
DC component treatment unit 122 receives described electric signal, and extracts described DC component signal from this electric signal.Particularly, DC component treatment unit 122 can comprise the filtering circuit (not shown), and it extracts the DC component signal by filtering AC compounent signal from described electric signal.For example, described filtering circuit can be low-pass filter circuit, and it can extract the DC component signal by the component filtering that described electric signal medium frequency is greater than to 1Hz.Described DC component signal is output to AC compounent processing unit 123 and A/D converting unit 124.
AC compounent processing unit 123 receives described electric signal and DC component signal, and obtains described AC compounent signal by deduct the DC component signal from described electric signal.Particularly, AC compounent treatment circuit 123 can comprise the differential amplifier circuit (not shown), for carrying out subtracting each other of above-said current signal.Preferably, this differential amplifier circuit also amplifies obtained AC compounent signal.More preferably, DC component treatment unit 123 can also comprise one or more amplifying circuits, for further amplifying from the AC compounent signal of difference channel output.
A/D converting unit 124 is converted to the Digital AC component signal by described AC compounent signal, and it is outputed to controller 13 to carry out subsequent treatment.In some cases, for example, at the aging timing carried out hereinafter described, A/D converting unit 124 can also be converted to the digital DC component signal for use by described DC component signal.
Fig. 7 shows a kind of example implementation mode of light signal sampling thief 12.As shown in Figure 7, photoelectric conversion interface unit 121 comprises photoelectric switching circuit P1 and current-to-voltage converting circuit.Photoelectric switching circuit P1 can be photodiode, and it receives the light signal that the second optical fiber 118 transmits, and is converted into current signal.Current-to-voltage converting circuit comprises operational amplifier U1, resistor R1 and capacitor C1, and wherein, resistor R1 and capacitor C1 are connected in parallel between the inverting input and output terminal of operational amplifier U1, the in-phase input end ground connection of operational amplifier.This change-over circuit converts described current signal to the voltage signal V had than amplitude
0, the stack that wherein this voltage signal is DC voltage component signal Vdc and the alternating voltage component signal Vac that changes along with the electric current in wire is linear, i.e. V
0=Vdc+Vac.
DC component treatment unit 122 comprises operational amplifier U4, resistor R8 and R9, capacitor C3 and C4.Resistor R8 and capacitor C3 are connected to form first order low-pass filter circuit, and resistor R9 and capacitor C4 are connected to form second level low-pass filter circuit.Resistance value by suitably selecting resistor R8 and R9 and the capacitance of capacitor C3 and C4, can select the cutoff frequency of each filtering circuit, thereby to the voltage signal V of photoelectric conversion interface unit 121 outputs
0carry out low-pass filtering, so that the alternating voltage component signal Vac in this voltage signal of filtering.In the present embodiment, by described filtering circuit filtering frequency for example > the alternating voltage component signal of 1Hz, thus retain DC voltage component signal Vdc.This DC voltage component signal Udc is applied to the in-phase end of operational amplifier U4.The end of oppisite phase of operational amplifier U4 is connected to form voltage follower with output terminal, it outputs to AC compounent processing unit 123 and A/D converting unit 124 by described DC voltage component signal Vdc.Will be appreciated that, although used the two-stage low-pass filter circuit in this example, according to factors such as design needs, also can adopt one-level or more multistage low-pass filter circuit.
AC compounent treatment circuit 123 comprises differential amplifier circuit, and preferably includes the inverse filtering amplifying circuit.Differential amplifier circuit comprises operational amplifier U2 and resistor R2, R3, R4 and R5, and wherein R3 equates with R5 resistance, and R2 equates with R4 resistance.The electric signal V of photoelectric conversion interface unit 121 outputs
0be input to the end of oppisite phase of operational amplifier U2 via resistor R2, the DC voltage component signal Vdc of DC component treatment unit 122 outputs is input to the in-phase end of operational amplifier U2 via resistor R4.The output of this differential amplifier circuit (that is, the output of operational amplifier U2) is:
At R
3with R
2in equal situation, this differential amplifier circuit, by described voltage signal and d. c. voltage signal are subtracted each other, obtains the alternating voltage component signal.Preferably, make R
3be greater than R
2, make this differential amplifier circuit amplify by the above-mentioned alternating voltage component signal that subtracts each other acquisition.
The inverse filtering amplifying circuit comprises operational amplifier U3, resistor R6 and R7 and capacitor C2, wherein, the alternating voltage component signal of operational amplifier U2 output is connected to the end of oppisite phase of operational amplifier U3 via resistor R6, the in-phase end ground connection of U3, capacitor C2 and resistor R7 are connected in parallel between the inverting input and output terminal of operational amplifier U3.This inverse filtering amplifying circuit waits owing to disturbing the high fdrequency component caused for the described alternating voltage component signal of filtering, for example frequency is greater than the frequency component of 5kHz, and filtered alternating voltage component signal is amplified, then the alternating voltage component signal after amplifying (nVac, n is total magnification) outputs to A/D converting unit 124.Will be appreciated that, although Fig. 7 shows an inverse filtering amplifying circuit, according to the design needs, also this circuit can be set, or more inverse filtering amplifying circuits can be set.Yet, according to the size of the electric current in wire, should reasonably select the total magnification n of differential amplifier circuit and inverse filtering amplifying circuit, make in the changing voltage scope of alternating voltage component signal nVac in A/D converting unit 124 of final output.
A/D converting unit 124 is converted to the Digital AC component signal by described alternating voltage component signal, and provides it to controller 13.In some cases, for example, at the aging timing carried out hereinafter described, A/D converting unit 124 can also be converted to the digital DC component signal for use by described DC voltage component signal.
Will be appreciated that, the implementation shown in Fig. 7 is only exemplary, rather than restrictive, and except this implementation, described light signal sampling thief can also adopt other implementations.For example, in Fig. 7, although the end of the in-phase end of operational amplifier U1, U2 and U3 and capacitor C3 and C4 is shown as ground connection, they also can be connected to low-voltage, for example approach 0 voltage.In addition, photoelectric conversion interface unit, DC component treatment unit and AC compounent processing unit also are not limited to the circuit shown in Fig. 7, also can adopt the circuit of other type, as long as this circuit can be realized the function with reference to the unit of Fig. 6 description.
In one embodiment, determine as follows correction coefficient.Particularly, according to mentioned above known, the alternating voltage component signal of AC compounent processing unit 123 outputs is along with the electric current linear change in wire.In other words, this alternating voltage component signal is that electric current in wire is exaggerated the signal that K obtains after doubly.Therefore, can determine electric current in wire and the ratio K of this alternating voltage component signal, as described correction coefficient, then by the Digital AC component signal by 124 outputs of A/D converting unit, be multiplied by the measured value (digital value) that K tries to achieve the electric current in wire.
Because ratio K after the current measurement system installation just is determined and remains unchanged, therefore can pre-determine K by following calibration process: make electric current flow through wire, then utilize respectively through the normalized current measuring system of overcorrect and the not calibrated current measurement system according to the embodiment of the present invention and measure this electric current; The measurement result of tentative standard current measurement system is i
standard, according to the measurement result of the current measurement system of the embodiment of the present invention (that is, from the AC compounent treatment circuit or from the signal of A/D converting unit output), be i
measure, K=i
measure/ i
standard.Replacedly, can make known normalized current i
standardflow through wire, then measure this electric current with the not calibrated current measurement system according to the embodiment of the present invention, suppose that measurement result (that is, from AC compounent treatment circuit or the signal exported from the A/D converting unit) is i
measure, K=i
measure/ i
standard.This correction coefficient K can be stored in advance in controller 13.
In alternative embodiment, except utilizing above-mentioned K, carry out preliminary correction, also considering the impact that component ageing causes measurement result and measurement result further being proofreaied and correct.Particularly, as time goes by, the element in current measurement system can occur aging, and this makes the measurement result of this system become not accurate enough.Therefore, when each measurement electric current, also preferably carry out aging correction, the adverse effect of measurement result being brought to eliminate component ageing.Particularly, when each measurement electric current, controller 13 can calculate from the effective value of the Digital AC component signal of A/D converting unit 124 outputs and the ratio of digital DC component signal, as for proofreading and correct the COEFFICIENT K of burn-in effects ', then described Digital AC component signal is multiplied by K and COEFFICIENT K ', to obtain the measured value of the electric current in wire.In other words, in the present embodiment, use amassing as described correction coefficient of K and K '.
By the light signal method of sampling of using the light signal sampling thief shown in Fig. 6 or this sampling thief to use, current measurement system according to the above embodiment of the present invention can improve the sampling precision when light signal of optical current mutual inductor output is sampled and reduce phase error, thereby with the electric current in higher precision measure wire.
Below, with reference to Fig. 8, for example describe according to the cellular installation of the mutual inductance for the optical current mutual inductor by shown in Fig. 3 to Fig. 5 of the embodiment of the present invention, to the stationary installation (miscellaneous part shown in Fig. 3 to Fig. 5 can be positioned at outside this stationary installation) on wire (, the power transmission line in electrical network).This stationary installation can be made by the magnetic-permeable material such as pure iron, mild carbon steel, ferroaluminium, ferro-silicium, iron-nickel alloy, ferrocobalt, Ferrite Material, nickel, cobalt, so that magnetic field can see through this device and reach magnetic induction device place.In addition, as described above, described mutual inductance unit can be encapsulated as right cylinder or rectangular parallelepiped so that install.
Fig. 8 shows the overall perspective according to the stationary installation of the embodiment of the present invention.Fig. 9 shows the partial enlarged drawing of this stationary installation.As shown in Figure 8 and Figure 9, stationary installation 90 comprises hollow tubing conductor 91, hollow cylinder base 92, hollow bent pipe 93 and 94, mutual inductance cellular installation container 95, fixture 96 and 97 and stator 98 and 99.
Mutual inductance cellular installation container 95 has the first arm and the second arm be perpendicular to one another, on the first arm, have for holding the arc groove of wire, on a side contrary with described groove of the second arm, have for the cavity (not shown) of described mutual inductance unit is installed, wherein, described mutual inductance unit is installed in cavity, makes the optical axis of the magnetic induction medium in this mutual inductance unit vertical with the direction of current in wire.To describe after a while mutual inductance cellular installation container 95 in detail.
Below will describe mutual inductance cellular installation container 95 in detail.Figure 10 shows the skeleton view of mutual inductance cellular installation container 95 when seeing from oblique upper.Figure 11 shows the skeleton view of mutual inductance cellular installation container 95 when seeing from oblique below.Figure 12 is the skeleton view when the mutual inductance cellular installation container 95 that the mutual inductance unit has been installed when oblique below is seen.
As shown in figure 10, mutual inductance cellular installation container 95 has the first arm 951 and the second arm 952 be perpendicular to one another.Have arc groove 9511 on the first arm 951, this groove extends to the other end from an end of the first arm 951, makes wire can be accommodated in this groove.Preferably, in groove 9511, form screw thread, for example the waveform screw thread, to increase the friction factor between wire and groove, prevent that the two from relative sliding occurring.Also there is screw 9512(Figure 10 and only show an end face on each end face vertical with the wire bearing of trend of the first arm 951), for by screw, connecting stator 98 or 99 be fixed to this end face.Preferably, also form respectively groove 9513(referring to Figure 11 in the two ends of the first arm 951, a side contrary with groove 9511).
As shown in figure 11, form cavity 9521 on a side contrary with groove 9511 of the second arm 952, the mutual inductance unit of optical current mutual inductor is installed in this cavity.Preferably, form protruding platform in the middle of cavity 9521, and four screw seats 9522 are set on this platform, make wire in the groove 9511 perpendicular to being fixed on the first arm 951 and while in cavity 9521, the mutual inductance unit being installed, as shown in figure 12, can utilize two compressing tablets 9523 the mutual inductance unit to be fixed in to the bottom surface of cavity 9511, each compressing tablet is fixed on two screw seats by screw.Described compressing tablet can be made by materials such as pure iron, mild carbon steel, ferroaluminium, ferro-silicium, iron-nickel alloy, ferrocobalt, Ferrite Material, nickel, cobalts.Will be appreciated that, also described platform can be set, but only by screw seat and compressing tablet or other fixed sturctures commonly used by the mutual inductance cellular installation in cavity.
Mutual inductance cellular installation container 95 also has the cover plate (not shown) for enclosed cavity 9521, and it can be such as being fixed on the second arm 952 by screw etc., thereby mutual-inductance element is encapsulated in cavity 9521.This cover plate also is connected with 94 such as waiting by welding with hollow bent pipe 93, makes cavity 9521 and the inner space of hollow tubing conductor 91, hollow cylinder Connection Block 92 and hollow bent pipe 93 and 94 communicate with each other.
Below will describe fixture 96 and 97 in detail.Because these two clamp structures are identical, the fixture 96 of therefore here take is described as example.
Figure 13 shows the skeleton view of fixture 96.As shown in figure 13, fixture 96 comprises the first sidepiece 961, the second sidepiece 962 and connects these two sidepieces connecting portion 963, the first sidepieces, the second sidepiece and connecting portion form U-shaped structure.Be provided with screw rod 964 on the first sidepiece 961, it can be screwed into or back-out with respect to the second sidepiece 962.This screw rod preferably has ring-shaped handle 9641, so that turn this screw rod with hand.In addition, preferably, at the side formation arc groove 965 in the face of the first sidepiece 961 of the second sidepiece 962, it matches with groove 9511, thereby wire is limited in these two grooves.Groove 965 preferably also has screw thread, with the friction factor between increase and wire.When fitting together with mutual inductance cellular installation container 95, as shown in figure 10, the first arm 951 of mutual inductance cellular installation container 95 is between first sidepiece 961 and the second sidepiece 962 of fixture 96, make when when the second sidepiece 962 is screwed into screw rod 964, the wire be placed between groove 965 and groove 9511 is clamped, thereby mutual inductance cellular installation container 95 and wire are secured together.In the same way, fixture 97 is arranged on symmetrically to another position of the first arm 951 about the second arm 952 and fixture 96.Like this, by two fixtures, mutual inductance cellular installation container is fixed on wire, makes wire and install between container can not shake.As described above, also preferably be provided with two grooves 9513 on the first arm 9511 that container is installed, each groove is designed to screw rod on corresponding fixture respectively when the second arm of this fixture is screwed into, the head of screw rod enters this groove, and this can prevent from installing container 95 with respect to wire generation relative sliding.
Below will describe stator 98 and 99 in detail.Because these two stator structures are identical, therefore for the sake of simplicity, here only stator 98 is described.Figure 14 shows the skeleton view of stator 98.Stator 98 comprises two arms 981 and 982 that are L-type, be provided with the screw 983 matched with screw 9512 on one arm 981, make and can connect stator 98 is installed to and installs on container 95 by screw, wherein, the size of arm 981 is designed can not block groove 9511 when this stator 98 is installed on installation container 95.Another arm 982 of stator 98 is designed to separate certain intervals with the first arm 951 that container 95 is installed when this stator is installed on installation container 95, make and the connecting portion of fixture 96 can be placed in this interval, thereby fixture 96 is restricted to and can only slides along the direction or the reverse direction that wire are pressed on container 95.
Stationary installation according to the embodiment of the present invention mentioned above is exemplary, rather than restrictive.According to actual needs, also can be made various changes to it, and do not deviated from scope of the present invention.For example, use in the above-described embodiments screw to connect a plurality of parts, but also can connect corresponding component with the alternate manner of welding, riveted joint and so on.In the situation that screw connects, the quantity of the screw/screw used/screw seat also can freely be selected according to actual needs.In addition, in the above-described embodiments, limit the glide direction of fixture with stator, but also can use other structure (for example slide rail) that Fixture assembly is being installed on container and limited its glide direction.In addition, also show a lot of structural details in Fig. 8 to Figure 14, according to actual needs, also can omit or revise these details.
The stationary installation for optical current mutual inductor with respect to traditional at least has the following advantages according to the stationary installation of the embodiment of the present invention:
1. in traditional stationary installation, usually use single clamp that mutual inductor is fixed on wire, this makes between wire and mutual inductor, and relative rocking and relative sliding may occur, thereby affects the accuracy of measurement result.In the present invention, used two fixtures to fix the mutual inductance unit, and designed screw thread within holding the groove of wire, this makes between wire and mutual inductance unit, and relative rocking and relative sliding can not occur, and improved measuring accuracy.
2. in the stationary installation according to the embodiment of the present invention, being provided with screw rod 964 on fixture adjusts the second sidepiece of this fixture and the spacing between container 95 is installed, this makes it possible at fixture and the fixedly wire of different-diameter is installed between container 95, thereby makes to go for country variant and regional power transmission line according to the stationary installation of the embodiment of the present invention.
3. in traditional stationary installation, after the optical current mutual inductor by current measurement system is installed on power transmission line, the various circuits of this measuring system occur intersecting with power transmission line, and this makes interference between phase and phase increase.By contrast, when using stationary installation according to the embodiment of the present invention to be fixed on power transmission line by the mutual inductance unit, mutual inductance unit and whole current measurement system all are positioned at a side of power transmission line (wire), for example, mutual inductance unit and whole current measurement system can be positioned at the below of horizontal power transmission line, make the circuit of whole current measurement system not intersect with power transmission line, thereby significantly reduced power transmission line interference between phase and phase.
4. in traditional stationary installation, usually use plastic grip to fix the mutual inductance unit.Along with plastic ageing, or, when weather changes, deformation can occur in plastic grip, causes the mutual inductance unit to occur loosening, and it is impaired that this not only makes the mutual inductance unit be easy to, and also can affect measurement effect.In the stationary installation according to the embodiment of the present invention, utilize the compressing tablet that screw and materials such as pure iron, mild carbon steel, ferroaluminium, ferro-silicium, iron-nickel alloy, ferrocobalt, Ferrite Material, nickel, cobalt are made that the mutual inductance unit is fixed in and installs on container, make the mutual inductance cell position firm, avoided the problems referred to above.In addition, idle bend pipe 93 and 94 radian be designed so that optical fiber can be safely cabling swimmingly, avoid accident due to optical fiber to fracture measuring system broken down.
Although illustrated and described example embodiment of the present invention, those skilled in the art are to be understood that, in the situation that the scope and spirit of the present invention that limit in not deviating from claim and equivalent thereof can be made the variation on various forms and details to these example embodiment.
Claims (37)
1. the current measurement system for the electric current of measure traverse line comprises:
Optical current mutual inductor, the magnetic field that utilizes described electric current to produce, produce the light signal corresponding with this electric current;
The light signal sampling thief comprises:
The photoelectric conversion interface unit, be converted to electric signal by described light signal, and this electric signal comprises DC component signal and AC compounent signal;
The DC component treatment unit extracts the DC component signal from described electric signal;
The AC compounent processing unit by by described electric signal and described DC component signal subtraction, extracts the AC compounent signal from described electric signal; With
AD conversion unit, be converted to the Digital AC component signal by described AC compounent signal; And
Controller, be multiplied by correction coefficient by described Digital AC component signal, thereby obtain the measured value of described electric current.
2. current measurement system as claimed in claim 1, wherein, described optical current mutual inductor comprises:
Optical transmitting set, the light that emission is propagated along first direction;
The mutual inductance unit comprises:
The first reverberator, reflex to described light second direction from first direction;
The first polarizer, its optical axis is on second direction, and the light reflected passes this first polarizer to become linearly polarized light;
The magnetic induction device, be disposed in described magnetic field, and its optical axis is on second direction, and described linearly polarized light, through this magnetic induction device, makes polarization direction deflect;
The second polarizer, its optical axis, on second direction, passes this second polarizer from the light of magnetic induction device outgoing; And
The second reverberator, reflex to described linearly polarized light third direction from second direction, as described light signal,
The angle of the polarization direction of wherein said the first polarizer and described the second polarizer is 45 °, described and second direction is different with described third direction from described first direction.
3. current measurement system as claimed in claim 2, wherein, described first direction and described third direction are respectively perpendicular to described second direction.
4. current measurement system as claimed in claim 2 or claim 3, wherein, described mutual inductance unit also comprises:
The first optical fiber, receive the also light of light conducting transmitter emission;
The first collimation lens, its optical axis, on first direction, will be directional light from the optical alignment of the first optical fiber outgoing, and it will be outputed to the first reverberator;
The second collimation lens, its optical axis, on third direction, is coupled to the light signal of the second reverberator reflection in the second optical fiber; And
Described the second optical fiber, by be coupled light signal transduction to the photoelectric conversion interface unit.
5. current measurement system as claimed in claim 1, wherein, described optical current mutual inductor comprises:
Optical transmitting set, the light that emission is propagated along first direction;
The mutual inductance unit comprises:
The first polarizer, its optical axis is on first direction, and described light passes this first polarizer to become linearly polarized light;
The first reverberator, reflex to second direction by described linearly polarized light from first direction;
The magnetic induction device, be disposed in described magnetic field, and its optical axis is on second direction, and the light reflected, through this magnetic induction device, makes polarization direction deflect;
The second reverberator, will reflex to third direction from second direction from the light of magnetic induction device outgoing; And
The second polarizer, its optical axis is on third direction, and the linearly polarized light reflected passes this second polarizer as described light signal;
The angle of the polarization direction of wherein said the first polarizer and described the second polarizer is 45 °, and described second direction is different with described third direction from described first direction.
6. current measurement system as claimed in claim 5, wherein, described first direction and described third direction are respectively perpendicular to described second direction.
7. current measurement system as described as claim 5 or 6, wherein, described mutual inductance unit also comprises:
The first optical fiber, receive the also light of light conducting transmitter emission;
The first collimation lens, its optical axis, on first direction, will be directional light from the optical alignment of the first optical fiber outgoing, and it will be outputed to the first polarizer;
The second collimation lens, its optical axis, on third direction, and will be coupled to through the light signal of the second polarizer outgoing in the second optical fiber; And
Described the second optical fiber, by be coupled light signal transduction to the photoelectric conversion interface unit.
8. current measurement system as described as claim 2 or 5, wherein, described mutual inductance unit is fixed on wire by stationary installation, and this stationary installation comprises:
Container is installed, there is the first arm and the second arm that are perpendicular to one another, there is the groove that holds wire on the first arm, at the second arm, on a side contrary with described groove, have for the cavity of described mutual inductance unit is installed, wherein, described mutual inductance unit is installed in cavity, makes the optical axis of the magnetic induction medium in this mutual inductance unit vertical with the direction of current in wire; With
At least one fixture, for being fixed to groove by wire.
9. stationary installation as claimed in claim 8, wherein, described groove has screw thread.
10. stationary installation as claimed in claim 8, wherein, described at least one fixture has by the first sidepiece, the second sidepiece and connects the first sidepiece and U-shaped structure that the connecting portion of the second sidepiece forms, the first arm of described installation container is between first sidepiece and the second sidepiece of fixture, make wire be sandwiched between the first arm and the second sidepiece
Wherein, on the first sidepiece, be provided with screw rod, when when the second sidepiece is screwed into screw rod, the spacing between the first arm of the second sidepiece and installation container reduces, and makes described wire clamped.
11. stationary installation as claimed in claim 10, wherein, be provided with groove facing on the end face of screw rod of the first arm that container is installed, and makes the head of screw rod be limited in groove.
12. stationary installation as claimed in claim 8, also comprise the first hollow bent pipe and the second hollow bent pipe, it is connected respectively to described cavity, makes two optical fiber that stretch out from the mutual inductance unit extend via described hollow bent pipe respectively.
13., as claim 1,2 or 5 described current measurement systems, wherein, described photoelectric conversion interface unit comprises:
Photoelectric switching circuit, for being converted to current signal by described light signal; And
Current-to-voltage converting circuit, for being converted to voltage signal by described current signal, as described electric signal.
14., as claim 1,2 or 5 described current measurement systems, wherein, described DC component treatment unit comprises:
At least one filtering circuit, to described electric signal carry out filtering with filtering AC compounent signal wherein, thereby extract the DC component signal;
Operational amplifier, form voltage follower, and described DC component signal is outputed to the AC compounent processing unit.
15., as claim 1,2 or 5 described current measurement systems, wherein, described AC compounent treatment circuit comprises:
Differential amplifier circuit, by described electric signal and described DC component signal subtraction, to extract the AC compounent signal.
16. current measurement system as claimed in claim 15, wherein, described differential amplifier circuit also amplifies extracted AC compounent signal.
17. current measurement system as claimed in claim 15, wherein, described AC compounent treatment circuit also comprises at least one amplifying circuit, for amplifying the AC compounent signal by differential amplifier circuit output.
18. current measurement system as claimed in claim 1, wherein, described correction coefficient is when utilizing described current measurement system to measure normalized current mobile in wire, the ratio between the AC compounent signal of described normalized current and the output of described AC compounent processing unit.
19. current measurement system as claimed in claim 1, wherein, AD conversion unit also is converted to the digital DC component signal by described DC component signal, and
Wherein, described correction coefficient is that K and K ' are long-pending, wherein K is for when utilizing described current measurement system to measure normalized current mobile in wire, ratio between the AC compounent signal of described normalized current and the output of described AC compounent processing unit, the ratio between the effective value that K ' is described Digital AC component signal and described digital DC component signal.
20. an optical current mutual inductor, the corresponding light signal for generation of the electric current with in wire, this optical current mutual inductor comprises:
Optical transmitting set, the light that emission is propagated along first direction;
The mutual inductance unit comprises:
The first polarizer, its optical axis is on first direction, and described light passes this first polarizer to become linearly polarized light;
The first reverberator, reflex to second direction by described linearly polarized light from first direction;
The magnetic induction device, be disposed in described magnetic field, and its optical axis is on second direction, and the light reflected, through this magnetic induction device, makes polarization direction deflect;
The second reverberator, will reflex to third direction from second direction from the light of magnetic induction device outgoing; And
The second polarizer, its optical axis is on third direction, and the linearly polarized light reflected passes this second polarizer as described light signal;
The angle of the polarization direction of wherein said the first polarizer and described the second polarizer is 45 °, and described second direction is different with described third direction from described first direction.
21. optical current mutual inductor as claimed in claim 20, wherein, described first direction and described third direction are respectively perpendicular to described second direction.
22. optical current mutual inductor as described as claim 20 or 21, wherein, described mutual inductance unit also comprises:
The first optical fiber, receive the also light of light conducting transmitter emission;
The first collimation lens, its optical axis, on first direction, will be directional light from the optical alignment of the first optical fiber outgoing, and it will be outputed to the first polarizer;
The second collimation lens, its optical axis, on third direction, and will be coupled to through the light signal of the second polarizer outgoing in the second optical fiber; And
Described the second optical fiber, by be coupled light signal transduction to the photoelectric conversion interface unit.
23. optical current mutual inductor as claimed in claim 20, wherein, described optical current mutual inductor comprises:
Optical transmitting set, the light that emission is propagated along first direction;
The mutual inductance unit comprises:
The first reverberator, reflex to described light second direction from first direction;
The first polarizer, its optical axis is on second direction, and the light reflected passes this first polarizer to become linearly polarized light;
The magnetic induction device, be disposed in described magnetic field, and its optical axis is on second direction, and described linearly polarized light, through this magnetic induction device, makes polarization direction deflect;
The second polarizer, its optical axis, on second direction, passes this second polarizer from the light of magnetic induction device outgoing; And
The second reverberator, reflex to described linearly polarized light third direction from second direction, as described light signal,
The angle of the polarization direction of wherein said the first polarizer and described the second polarizer is 45 °, described and second direction is different with described third direction from described first direction.
24. optical current mutual inductor as claimed in claim 23, wherein, described first direction and described third direction are respectively perpendicular to described second direction.
25. optical current mutual inductor as described as claim 23 or 24, wherein, described mutual inductance unit also comprises:
The first optical fiber, receive the also light of light conducting transmitter emission;
The first collimation lens, its optical axis, on first direction, will be directional light from the optical alignment of the first optical fiber outgoing, and it will be outputed to the first reverberator;
The second collimation lens, its optical axis, on third direction, is coupled to the light signal of the second reverberator reflection in the second optical fiber; And
Described the second optical fiber, by be coupled light signal transduction to the photoelectric conversion interface unit.
26. a light signal sampling thief, for light signal is sampled, this light signal sampling thief comprises:
The photoelectric conversion interface unit, be converted to electric signal by described light signal, and this electric signal comprises DC component signal and AC compounent signal;
The DC component treatment unit extracts the DC component signal from described electric signal;
The AC compounent processing unit by by described electric signal and described DC component signal subtraction, extracts the AC compounent signal from described electric signal; With
AD conversion unit, be converted to the Digital AC component signal by described AC compounent signal.
27. current measurement system as claimed in claim 26, wherein, described photoelectric conversion interface unit comprises:
Photoelectric switching circuit, for being converted to current signal by described light signal; And
Current-to-voltage converting circuit, for being converted to voltage signal by described current signal, as described electric signal.
28. current measurement system as claimed in claim 26, wherein, described DC component treatment unit comprises:
At least one filtering circuit, to described electric signal carry out filtering with filtering AC compounent signal wherein, thereby extract the DC component signal;
Operational amplifier, form voltage follower, and described DC component signal is outputed to the AC compounent processing unit.
29. current measurement system as claimed in claim 26, wherein, described AC compounent treatment circuit comprises:
Differential amplifier circuit, by described electric signal and described DC component signal subtraction, to extract the AC compounent signal.
30. current measurement system as claimed in claim 29, wherein, described differential amplifier circuit also amplifies extracted AC compounent signal.
31. current measurement system as claimed in claim 29, wherein, described AC compounent treatment circuit also comprises at least one amplifying circuit, for amplifying the AC compounent signal by differential amplifier circuit output.
32. a stationary installation, for the mutual inductance cellular installation by optical current mutual inductor, to wire, this stationary installation comprises:
Container is installed, there is the first arm and the second arm that are perpendicular to one another, there is the groove that holds wire on the first arm, at the second arm, on a side contrary with described groove, have for the cavity of described mutual inductance unit is installed, wherein, described mutual inductance unit is installed in cavity, makes the optical axis of the magnetic induction medium in this mutual inductance unit vertical with the direction of current in wire;
At least one fixture, for being fixed to groove by wire.
33. stationary installation as claimed in claim 32, wherein, described groove has screw thread.
34. stationary installation as claimed in claim 32, wherein, described at least one fixture has by the first sidepiece, the second sidepiece and connects the first sidepiece and U-shaped structure that the connecting portion of the second sidepiece forms, the first arm of described installation container is between first sidepiece and the second sidepiece of fixture, make wire be sandwiched between the first arm and the second sidepiece
Wherein, on the first sidepiece, be provided with screw rod, when when the second sidepiece is screwed into this screw rod, the spacing between the first arm of the second sidepiece and installation container reduces, and makes described wire clamped.
35. stationary installation as claimed in claim 34, wherein, be provided with groove facing on the end face of screw rod of the first arm that container is installed, and makes the head of screw rod be limited in groove.
36. stationary installation as claimed in claim 32, also comprise the first hollow bent pipe and the second hollow bent pipe, it is connected respectively to described cavity, makes two optical fiber that stretch out from the mutual inductance unit extend via described hollow bent pipe respectively.
37. the method for sampling of a light signal, for light signal is sampled, this light signal method of sampling comprises:
Described light signal is converted to electric signal, and this electric signal comprises DC component signal and AC compounent signal;
Extract the DC component signal from described electric signal;
By by described electric signal and described DC component signal subtraction, extract the AC compounent signal from described electric signal; With
Described AC compounent signal is converted to the Digital AC component signal.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2012/080734 WO2014032243A1 (en) | 2012-08-29 | 2012-08-29 | Current measurement system, optical current transformer and fixing device, and optical signal sampler and method therefor |
Related Child Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410095022.0A Division CN103837716A (en) | 2012-08-29 | 2012-08-29 | Fixing device of optical current transformer |
| CN201410094071.2A Division CN103823106A (en) | 2012-08-29 | 2012-08-29 | Optical current transformer |
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| Publication Number | Publication Date |
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| CN103443639A true CN103443639A (en) | 2013-12-11 |
| CN103443639B CN103443639B (en) | 2015-08-05 |
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| CN201280001221.XA Active CN103443639B (en) | 2012-08-29 | 2012-08-29 | Current measurement system, optical current mutual inductor and stationary installation and light signal sampler and method thereof |
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| WO (1) | WO2014032243A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107807269A (en) * | 2017-11-26 | 2018-03-16 | 吉林大学 | A kind of photoelectrical current detection means and its detection method for a variety of cables |
| CN107918049A (en) * | 2017-12-14 | 2018-04-17 | 厦门理工学院 | A kind of current detecting system |
| CN111323635A (en) * | 2020-02-26 | 2020-06-23 | 贵州江源电力建设有限公司 | Optical fiber sensing system and method for measuring current intensity of high-voltage conductor in non-contact mode |
| CN111721990A (en) * | 2020-06-01 | 2020-09-29 | 贵州江源电力建设有限公司 | Miniaturized optical fiber current sensor and information processing system |
| CN111721993A (en) * | 2020-06-19 | 2020-09-29 | 贵州江源电力建设有限公司 | High-sensitivity miniaturized current detection system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0695049A (en) * | 1992-09-10 | 1994-04-08 | Sumitomo Metal Mining Co Ltd | Magneto-optical field sensor |
| JP2000292459A (en) * | 1999-04-09 | 2000-10-20 | Takaoka Electric Mfg Co Ltd | Optical current transformer |
| US6154022A (en) * | 1995-12-07 | 2000-11-28 | Siemens Ag | Optical measuring method and optical measuring device for measuring an alternating magnetic field having intensity normalization |
| CN101699585A (en) * | 2009-12-07 | 2010-04-28 | 河南省电力公司许昌供电公司 | Optical current transformer |
| CN101762795A (en) * | 2009-12-31 | 2010-06-30 | 上海舜宇海逸光电技术有限公司 | Optical fiber magneto-optic detection system and method |
| CN201876487U (en) * | 2010-09-29 | 2011-06-22 | 屈玉福 | Optical current measuring sensor |
-
2012
- 2012-08-29 CN CN201280001221.XA patent/CN103443639B/en active Active
- 2012-08-29 WO PCT/CN2012/080734 patent/WO2014032243A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0695049A (en) * | 1992-09-10 | 1994-04-08 | Sumitomo Metal Mining Co Ltd | Magneto-optical field sensor |
| US6154022A (en) * | 1995-12-07 | 2000-11-28 | Siemens Ag | Optical measuring method and optical measuring device for measuring an alternating magnetic field having intensity normalization |
| JP2000292459A (en) * | 1999-04-09 | 2000-10-20 | Takaoka Electric Mfg Co Ltd | Optical current transformer |
| CN101699585A (en) * | 2009-12-07 | 2010-04-28 | 河南省电力公司许昌供电公司 | Optical current transformer |
| CN101762795A (en) * | 2009-12-31 | 2010-06-30 | 上海舜宇海逸光电技术有限公司 | Optical fiber magneto-optic detection system and method |
| CN201876487U (en) * | 2010-09-29 | 2011-06-22 | 屈玉福 | Optical current measuring sensor |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107807269A (en) * | 2017-11-26 | 2018-03-16 | 吉林大学 | A kind of photoelectrical current detection means and its detection method for a variety of cables |
| CN107807269B (en) * | 2017-11-26 | 2023-12-15 | 吉林大学 | Photoelectric current detection device for various cables and detection method thereof |
| CN107918049A (en) * | 2017-12-14 | 2018-04-17 | 厦门理工学院 | A kind of current detecting system |
| CN111323635A (en) * | 2020-02-26 | 2020-06-23 | 贵州江源电力建设有限公司 | Optical fiber sensing system and method for measuring current intensity of high-voltage conductor in non-contact mode |
| CN111721990A (en) * | 2020-06-01 | 2020-09-29 | 贵州江源电力建设有限公司 | Miniaturized optical fiber current sensor and information processing system |
| CN111721993A (en) * | 2020-06-19 | 2020-09-29 | 贵州江源电力建设有限公司 | High-sensitivity miniaturized current detection system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103443639B (en) | 2015-08-05 |
| WO2014032243A1 (en) | 2014-03-06 |
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