CN201438414U - Self-healing optical current mutual inductor - Google Patents
Self-healing optical current mutual inductor Download PDFInfo
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- CN201438414U CN201438414U CN2009201008471U CN200920100847U CN201438414U CN 201438414 U CN201438414 U CN 201438414U CN 2009201008471 U CN2009201008471 U CN 2009201008471U CN 200920100847 U CN200920100847 U CN 200920100847U CN 201438414 U CN201438414 U CN 201438414U
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Abstract
The utility model relates to a self-healing optical current mutual inductor, which solves the problems of the prior optical current mutual inductor that the measurement precision is not high, the temperature stability is poor and the long-term running reliability is poor. An optical current mutual inductor and a self-healing corrector are arranged on a power transmission bus, the data signal output ends of the optical current mutual inductor and the self-healing corrector are respectively connected with the data signal input ends of a digital signal demodulation module and an industrial-frequency filter module in an algorithm realization unit, the signal output end of the digital signal demodulation module is respectively connected with the signal input end of the industrial-frequency filter module and a coefficient correction module, and the data signal input end and the data signal output end of a malfunction judging module are respectively connected with the data signal output end of the industrial-frequency filter module and the data signal input end of the coefficient correction module. The self-healing optical current mutual inductor has the advantages of high measurement accuracy, good temperature stability and high reliability.
Description
Technical field
The utility model is specifically related to a kind of current transformer.
Background technology
Modern power systems need be measured accurately, the current transformer of insulation safety and numeral output.Traditional electromagnetic current transducer is owing to exist the magnetic circuit saturation problem, and the transient measuring precision can not fine satisfied protection control and the requirement that dynamic observes; Insulation safety is undesirable, and the insulation safety fault happens occasionally; Problems such as analog quantity output can not satisfy the needs that the digital power system builds.Along with modern optical fiber technology, development of electronic technology, electronic current mutual inductor replaces the inexorable trend that traditional electromagnetic current transducer has become development.
At present, electronic current mutual inductor mainly contains two kinds: air core coil electronic current mutual inductor and optical current mutual inductor.The air core coil electronic current mutual inductor adopts air core coil as sensor coil, sensor coil is a suitable current with the high voltage bus induction by current, become voltage signal through the sample resistance module converts, convert light signal in the high-pressure side to by treatment circuit, be transmitted through the fiber to low-pressure side and carry out signal recovery and teletransmission, realize measurement the high voltage bus electric current.Air core coil is not owing to be with iron core, be subject to outside electromagnetic interference, the coiling shape and the technological requirement of its coil are very high simultaneously, and coil rack also is subjected to Effect of Environmental such as temperature to a certain extent, temperature stability is relatively poor, makes its certainty of measurement can not reach very high; And because its high-side signal treatment circuit needs power supply reliably and with long-term, power supply design and low power dissipation design are the difficult point and the key technologies of the air core coil electronic current mutual inductor research of prior art.Mainly contain two kinds of laser energy supply and floated power supplys in the existing high voltage source technology.The laser energy supply since the life-span that the characteristic of semi-conducting material has determined high power laser generally only about several years, far can not satisfy the requirement of power system measuring to instrument transformer operation steady in a long-term.Floated power supply because there is the work dead band in the high voltage bus electric current when too small, when high voltage bus outlet Short-Circuit High Current, needs the design specialized circuitry to absorb unnecessary energy, makes floated power supply power supply reliability reduce.The instability of power supply power supply will influence the measuring accuracy of current transformer greatly.
Optical current mutual inductor is the principle work that utilizes faraday's magnetic rotation effect, its general magneto-optic glass material optical current sensing head that adopts, the deflection angle that the linearly polarized light of detection by the optical current sensing head caused by changes of magnetic field realizes the measurement to the high voltage bus electric current.Because the change of environmental factors such as temperature, magneto-optic memory technique can produce linear birefrigence, makes optical current mutual inductor have temperature characterisitic, and these temperature characterisitics have the complexity that can't describe, may compensate with temperature hardly.Therefore, the optical current mutual inductor of prior art is subjected to the restriction of optical technology and optical material, and its accuracy of measurement is not high, temperature stability is poor, can't reach the practicability requirement of operation steady in a long-term.
Granted publication CN1271413C, Granted publication day are that August 23, the patent No. in 2006 are that ZL03125392.X, denomination of invention are that a kind of Chinese invention patent of photoelectric current inductor discloses a kind of photoelectric current inductor, introduce standard Magnetic Field by permanent magnet, reach real-Time Compensation ambient temperature etc. and cause the influence of linear birefrigence measurement result, cause the influence of linear birefrigence though above-mentioned technology has solved real-Time Compensation ambient temperature etc., also exist the permanent magnet of high stability to be difficult to obtain measurement result; Accuracy of measurement is subject to the problems such as influence of the change in location that external causes such as installation site and vibration cause.
In sum, existing optical current mutual inductor certainty of measurement is not high, and temperature stability is poor, and the long-time running poor reliability makes optical current mutual inductor not reach real practicability requirement.
The utility model content
To exist certainty of measurement not high in order to solve existing optical current mutual inductor for the utility model, and temperature stability is poor, the problem of long-time running poor reliability, and a kind of self-healing optical current transducer that proposes.
Self-healing optical current transducer, it is made up of optical current sensor, self-healing adjuster and algorithm realization unit; Algorithm realization unit is made up of digital demodulation signal module, power frequency filtration module, fault judgement module and coefficient correction module; Optical current sensor and self-healing adjuster are installed in respectively on the electric power transmission bus, the data-signal output of optical current sensor realizes that with algorithm the data-signal input of digital demodulation signal module in the unit links to each other, first signal output part of digital demodulation signal module links to each other with the secondary signal input of power frequency filtration module, the secondary signal output of digital demodulation signal module links to each other with first signal input part of coefficient correction module, the data-signal output of self-healing adjuster realizes that with algorithm the first data-signal input of power frequency filtration module in the unit links to each other, the data-signal output of power frequency filtration module links to each other with the data-signal input of fault judgement module, the data-signal output of fault judgement module links to each other with the second data-signal input of coefficient correction module, the data-signal output of coefficient correction module links to each other with the signal input part of secondary power equipment, and the data-signal output of coefficient correction module is the data-signal output of self-healing optical current transducer.
The utlity model has the accuracy of measurement height, temperature stability is good, the advantage that reliability is high.Its adopts self-healing adjuster 3, uses the self-healing alignment technique and has eliminated the influence that the optical current mutual inductor accuracy of measurement is subject to extraneous factors such as ambient temperature and vibration fully; Adopt discontinuity self-healing to proofread and correct, make the high-pressure side power supply be in the discontinuous power supply state, improved power supply power supply reliability and life-span greatly; Adopt the optical current sensor of passive structures, do not exist owing to the high-pressure side dead electricity, output error message causes the situation of protection misoperation.
Description of drawings
Fig. 1 is a modular structure schematic diagram of the present utility model, Fig. 2 is the modular structure schematic diagram of optical current sensor 2, Fig. 3 is the structural representation that optical current sensing unit 2-1 adopts vertical bar shaped magneto-optic glass formula, Fig. 4 is the structural representation that optical current sensing unit 2-1 adopts the ring concentrator formula, Fig. 5 adopts the structural representation of block glass shape magnetic for light glass type optical current sensing unit 2-1, Fig. 6 is the structural representation that optical current sensing unit 2-1 adopts the sensor fibre formula, Fig. 7 is the modular structure schematic diagram of analog signal processing circuit 2-4, Fig. 8 is the modular structure schematic diagram of self-healing adjuster 3, and Fig. 9 is the block diagram that the alternating current-direct current trim scheme algorithm of a sensing unit among Fig. 3 is realized.
Embodiment
Embodiment one: in conjunction with Fig. 1 present embodiment is described, present embodiment is made up of optical current sensor 2, self-healing adjuster 3 and algorithm realization unit 4; Algorithm realization unit 4 is made up of digital demodulation signal module 4-1, power frequency filtration module 4-2 fault judgement module 4-3 and coefficient correction module 4-4; Optical current sensor 2 and self-healing adjuster 3 are installed in respectively on the electric power transmission bus 1, the data-signal output of optical current sensor 2 realizes that with algorithm the data-signal input of digital demodulation signal module 4-1 in the unit 4 links to each other, first signal output part of digital demodulation signal module 4-1 links to each other with the secondary signal input of power frequency filtration module 4-2, the secondary signal output of digital demodulation signal module 4-1 links to each other with first signal input part of coefficient correction module 4-4, the data-signal output of self-healing adjuster 3 realizes that with algorithm the first data-signal input of power frequency filtration module 4-2 in the unit 4 links to each other, the data-signal output of power frequency filtration module 4-2 links to each other with the data-signal input of fault judgement module 4-3, the data-signal output of fault judgement module 4-3 links to each other with the second data-signal input of coefficient correction module 4-4, the data-signal output of coefficient correction module 4-4 links to each other with the signal input part of secondary power equipment, and the data-signal output of coefficient correction module 4-4 is the data-signal output of self-healing optical current transducer.
Embodiment two: in conjunction with Fig. 8 present embodiment is described, present embodiment and embodiment one difference are that self-healing adjuster 3 is made up of underloading coil module 3-1, sample resistance module 3-2, high-voltage suppling power module 3-3, high-pressure side circuit 3-10 and lower-voltage circuit 3-11; High-pressure side circuit 3-10 is made up of overvoltage crowbar 3-4, biasing circuit 3-5, frequency modulation circuit 3-6 and high pressure electro-optical conversion circuit 3-7; Lower-voltage circuit 3-11 is made up of low pressure electro-optical conversion circuit 3-8 and signal demodulating circuit 3-9; The signal input part of underloading coil module 3-1 is the signal input part of self-healing adjuster 3, the signal output part of underloading coil module 3-1 links to each other with the signal input part of sample resistance module 3-2, the signal input part of overvoltage crowbar 3-4 among the signal output part of sample resistance module 3-2 and the high-pressure side circuit 3-10 links to each other, the signal output part of overvoltage crowbar 3-4 links to each other with the signal input part of biasing circuit 3-5, the signal output part of biasing circuit 3-5 links to each other with the signal input part of frequency modulation circuit 3-6, the signal output part of frequency modulation circuit 3-6 links to each other with the signal input part of high pressure electro-optical conversion circuit 3-7, the signal output part of high pressure electro-optical conversion circuit 3-7 is the signal output part of high-pressure side circuit 3-10, the signal input part of low pressure electro-optical conversion circuit 3-8 among the signal output part of high pressure electro-optical conversion circuit 3-7 and the lower-voltage circuit 3-11 links to each other, the signal output part of low pressure electro-optical conversion circuit 3-8 links to each other with the signal input part of signal demodulating circuit 3-9, and the signal output part of signal demodulating circuit 3-9 is the data-signal output of self-healing adjuster 3; Four power supply outputs of high-voltage suppling power module 3-3 link to each other with power supply input, the power supply input of biasing circuit 3-5, the power supply input of frequency modulation circuit 3-6 and the power supply input of high pressure electro-optical conversion circuit 3-7 of overvoltage crowbar 3-4 among the circuit 3-10 of high-pressure side simultaneously.Other composition is identical with embodiment one with connected mode.
Embodiment three: in conjunction with Fig. 2 present embodiment is described, present embodiment and embodiment one difference are that optical current sensor 2 is made up of optical current sensing unit 2-1, light source 2-2, photoelectric detector 2-3 and analog signal processing circuit 2-4; The beam projecting end of light source 2-2 links to each other with the light incident end of optical current sensing unit 2-1, the signal output part of optical current sensing unit 2-1 links to each other with the signal input part of photoelectric detector 2-3, the data-signal output of photoelectric detector 2-3 links to each other with the data-signal input of analog signal processing circuit 2-4, and the data-signal output of analog signal processing circuit 2-4 is the data-signal output of optical current sensor 2.Other composition is identical with embodiment one with connected mode.
Embodiment four: present embodiment is described in conjunction with Fig. 3, present embodiment and embodiment three differences are that optical current sensing unit 2-1 is made up of two identical sensing units of structure, two identical sensing units of structure relatively are arranged on the both sides of electric power transmission bus 1, described sensing unit is by three optical fiber collimator 2-1-1, polarizer 2-1-2, vertical bar shaped magneto-optic glass 2-1-3 and analyzer 2-1-4 form, first optical fiber collimator 2-1-1 is installed on the side end face of polarizer 2-1-2, the opposite side end face of polarizer 2-1-2 links to each other with the side end face of vertical bar shaped magneto-optic glass 2-1-3, the opposite side end face of vertical bar shaped magneto-optic glass 2-1-3 links to each other with the side end face of analyzer 2-1-4, second optical fiber collimator 2-1-1 is installed on the side end face of analyzer 2-1-4, the 3rd optical fiber collimator 2-1-1 is installed on another side of analyzer 2-1-4 the central optical axis of described first optical fiber collimator 2-1-1, the central optical axis of polarizer 2-1-2, the central optical axis of vertical bar shaped magneto-optic glass 2-1-3 and the central optical axis of second optical fiber collimator 2-1-1 are positioned on the same axis.Other composition is identical with embodiment three with connected mode.
Embodiment five: present embodiment is described in conjunction with Fig. 4, present embodiment and embodiment three differences are that optical current sensing unit 2-1 is made up of a ring concentrator 2-1-5 and a sensing unit, described sensing unit is by three optical fiber collimator 2-1-1, polarizer 2-1-2, vertical bar shaped magneto-optic glass 2-1-3 and analyzer 2-1-4 form, first optical fiber collimator 2-1-1 is installed on the side end face of polarizer 2-1-2, the opposite side end face of polarizer 2-1-2 links to each other with the side end face of vertical bar shaped magneto-optic glass 2-1-3, the opposite side end face of vertical bar shaped magneto-optic glass 2-1-3 links to each other with the side end face of analyzer 2-1-4, second optical fiber collimator 2-1-1 is installed on the side end face of analyzer 2-1-4, the 3rd optical fiber collimator 2-1-1 is installed on another side of analyzer 2-1-4 the central optical axis of described first optical fiber collimator 2-1-1, the central optical axis of polarizer 2-1-2, the central optical axis of vertical bar shaped magneto-optic glass 2-1-3 and the central optical axis of second optical fiber collimator 2-1-1 are positioned on the same axis.Described ring concentrator 2-1-5 is the annulus that has a fracture, electric power transmission bus 1 is placed on the circle centre position of ring concentrator 2-1-5, described sensing unit is placed in the fracture of ring concentrator 2-1-5, and the axial direction of sensing unit is identical with the tangential direction of ring concentrator 2-1-5.Other composition is identical with embodiment three with connected mode.
Embodiment six: present embodiment is described in conjunction with Fig. 5, present embodiment and embodiment three differences are that the sensing unit of optical current sensing unit 2-1 is by three optical fiber collimator 2-1-1, polarizer 2-1-2, block glass shape magneto-optic glass 2-1-6 and analyzer 2-1-4 form, electric power transmission bus 1 is placed on the central axis place of block glass shape magneto-optic glass 2-1-6, first optical fiber collimator 2-1-1 is installed on the side end face of polarizer 2-1-2, the opposite side end face of polarizer 2-1-2 links to each other with the side end face of block glass shape magneto-optic glass 2-1-6, the opposite side end face of block glass shape magneto-optic glass 2-1-6 links to each other with the side end face of analyzer 2-1-4, second optical fiber collimator 2-1-1 is installed on the side end face of analyzer 2-1-4, the 3rd optical fiber collimator 2-1-1 is installed on another side of analyzer 2-1-4 the central optical axis of described first optical fiber collimator 2-1-1, the central optical axis of polarizer 2-1-2, the central optical axis of vertical bar shaped magneto-optic glass 2-1-3 is vertical mutually with the central optical axis of second optical fiber collimator 2-1-1.Other composition is identical with embodiment three with connected mode.
Embodiment seven: present embodiment is described in conjunction with Fig. 6, present embodiment and embodiment three differences are that the sensing unit of optical current sensing unit 2-1 is by three optical fiber collimator 2-1-1, polarizer 2-1-2, sensor fibre 2-1-7 and analyzer 2-1-4 form, electric power transmission bus 1 is placed on the circle centre position of the circle that sensor fibre 2-1-7 surrounded, first optical fiber collimator 2-1-1 is installed on the side end face of polarizer 2-1-2, the opposite side end face of polarizer 2-1-2 links to each other with the side end face of sensor fibre 2-1-7, the opposite side end face of sensor fibre 2-1-7 links to each other with the side end face of analyzer 2-1-4, second optical fiber collimator 2-1-1 is installed on the side end face of analyzer 2-1-4, and the 3rd optical fiber collimator 2-1-1 is installed on another side of analyzer 2-1-4.Other composition is identical with embodiment three with connected mode.
Embodiment eight: present embodiment is described in conjunction with Fig. 7, present embodiment and embodiment three differences are that analog signal processing circuit 2-4 is by reference voltage module 2-4-1, the first differential amplifier circuit 2-4-2, anti-aliasing low-pass filter circuit 2-4-3, the block isolating circuit 2-4-4 and the second amplifying circuit 2-4-5 form, the first data-signal input of the first differential amplifier circuit 2-4-2 is the data-signal input of analog signal processing circuit 2-4, the secondary signal input of the first differential amplifier circuit 2-4-2 links to each other with the signal output part of reference voltage module 2-4-1, the data-signal output of the first differential amplifier circuit 2-4-2 links to each other with the first data-signal input of anti-aliasing low-pass filter circuit 2-4-3 and the data-signal input of block isolating circuit 2-4-4 simultaneously, the data-signal output of block isolating circuit 2-4-4 links to each other with the data-signal input of the second amplifying circuit 2-4-5, the data-signal output of the second amplifying circuit 2-4-5 links to each other with the second data-signal input of anti-aliasing low-pass filter circuit 2-4-3, and the data-signal output of anti-aliasing low-pass filter circuit 2-4-3 is the data-signal output of analog signal processing circuit 2-4.Other composition is identical with embodiment three with connected mode.
The course of work of the present utility model:
The operation principle of optical current sensor 2 is described in conjunction with Fig. 2, Fig. 3 and Fig. 7: it comprises optical current sensing unit 2-1, light source 2-2, photoelectric detector 2-3 and analog signal processing circuit 2-4, wherein optical current sensing unit 2-1 comprises two sensing head unit that adopt straight-through light channel structure, lay respectively at the both sides of electric power transmission bus 1, constitute the measurement structure of differential mode.Sensing unit is made of optical fiber collimator 2-1-1, polarizer 2-1-2, vertical bar shaped magneto-optic glass 2-1-3 and analyzer 2-1-4.Light source 2-2 sends a branch of natural daylight into optical current sensing unit 2-1 by optical fiber, the light signal that contains tested current information is transmitted through the fiber to the photoelectric detector 2-3 that is positioned at low-pressure side again, the signal of telecommunication of process opto-electronic conversion needed input analog signal processing circuit 2-4 carry out signal condition before entering Digital Signal Processing.In order to effectively utilize analog-to-digital number of significant digit, improve the signal to noise ratio of input signal, the reference voltage V that the output signal of sensing head and the voltage reference chip 2-4-1 with high stability produce
mImport the first differential amplifier circuit 2-4-2 simultaneously and carry out one-level amplification A
1The output of optical current mutual inductor is divided into metering output and protects output according to the unusual of purposes, and metering output generally only needs first-harmonic and limited number of time harmonic information, and the raw information that generally needs to keep electric current is exported in protection; After through the first differential amplifier circuit 2-4-2, wherein one the tunnel enter the second amplifying circuit 2-4-5 again through block isolating circuit 2-4-4 and carry out secondary and amplify A
2As metering output, must be before entering analog to digital converter through anti-aliasing low-pass filter circuit 2-4-3; And other one the tunnel directly enter the analog to digital converter that algorithm is realized unit 4 by anti-aliasing low-pass filter circuit 2-4-3 as protection output.
The operation principle of self-healing adjuster 3 is described in conjunction with Fig. 8: it comprises underloading coil module 3-1, sample resistance module 3-2, high-pressure side power supply 3-3, high-pressure side circuit 3-10 and lower-voltage circuit 3-11.Electric power transmission bus 1 passes the center of the underloading coil module 3-1 that has little iron core, and the secondary coil of underloading coil module 3-1 is connected in series a high-accuracy little resistance sample resistance module 3-2, and it is output as a low voltage signal that is proportional to tested electric current.The voltage signal input high-pressure side letter circuit 3-10 that sample resistance module 3-2 obtains, high-pressure side power supply 3-3 is constituted by laser and photocell, high pressure electro-optical conversion circuit 3-7 is output as the light pulse signal that has tested current information through ovennodulation, light signal is transmitted through the fiber to the low-voltage optical change-over circuit 3-8 of lower-voltage circuit 3-11, low-voltage optical change-over circuit 3-8 reverts to frequency signal with the proportional relation of tested electric current with light pulse signal, signal demodulating circuit 3-9 carries out demodulation to frequency signal, the u as a result that obtains
REnter the analog to digital converter that algorithm is realized unit 4 by anti-aliasing low-pass filter circuit 2-4-3.
Digital demodulation signal module 4-1 is based on the basic handling module of the optical current mutual inductor of faraday's magnetic rotation effect principle in the algorithm realization unit 4, specifies as follows:
With a sensing unit is the example analysis, owing to need to measure the total current information that comprises direct current, present embodiment adopts the mode of double light path.When incident light during with any polarizing angle incident, double light path output is respectively:
In the formula: I
10Light intensity for the incident light light source of sensing unit;
k
11And k
12Be respectively the attenuation coefficient of sensing unit two-way output light path;
δ is the linear birefrigence of magneto-optic glass, and it comprises the intrinsic birefringence of glass material and the birefringence that extraneous factor is introduced.
When
The time, Δ ≈ δ has following formula to set up
The two-way output intensity information I of sensing unit
11And I
12, exporting I through being divided into 2 tunnel protections after the analog signal processing circuit 2-4 shown in Figure 7
11P' and I
12P' and 2 tunnel metering output I
11M' and I
12M', enter the digital demodulation signal module 4-1 that algorithm is realized unit 4 again.The double light path mode can there are differences between two light paths owing to use the two-way light intensity, and the characteristic of photoelectric detector in the two-way and amplifier can not be in full accord, i.e. attenuation coefficient k
11And k
12Be inconsistent, so can there be the trim between two light paths, present embodiment adopts the scheme of alternating current-direct current trim to realize, Fig. 9 is the block diagram that the alternating current-direct current trim scheme algorithm of a sensing unit among Fig. 3 is realized, is implemented as follows:
Protection output I
11P' and I
12P' at first dwindle A
1Doubly, add reference voltage V then
m, obtain I
11PAnd I
12P, its expression formula and I
11And I
12Consistent; Metering output I
11M' and I
12M' dwindle A earlier
1Doubly, dwindle A again
2Doubly, obtain I
11MAnd I
12M, its expression formula is I
11And I
12In alternating component, be expressed as:
Wherein, I
11PAnd I
12PBy being that the low pass filter of 1Hz obtains DC component I by frequency
11P, DCAnd I
12P, DC, being divided by after the averaged respectively obtains direct current trim COEFFICIENT K
1DCI
11MAnd I
12MAsking for respectively is divided by behind the effective value obtains exchanging the trim COEFFICIENT K
1ACThrough the corresponding poor protection output u that obtains sensing unit with computing that removes shown in Figure 9
1PWith metering output u
1M, expression formula is as follows:
Adopt and use the same method and step, can obtain the measurement result of another sensing unit: protection output u
2PWith u
1PIdentical, metering output u
2MWith u
1MIdentical.This example adopts the measurement structure of differential mode, i.e. the average u of the final output result of the optical current mutual inductor measurement result that is two sensing units
PWith u
M, its expression formula respectively with u
1PAnd u
1MIdentical.Moreover, when a sensing unit went wrong therein, the measurement result of another one sensing unit still can guarantee the correct operation protected, had improved the reliability of system.
Algorithm realizes that the power frequency filtration module 4-2 of unit 4 adopts fft algorithm, realizes the output result of self-healing adjuster 3 and the first-harmonic of the metering output result after the optical current sensor 2 process digital demodulation signal modules are extracted.
Algorithm realizes that the fault judgement module 4-3 of unit 4 mainly is by relatively the output result of self-healing adjuster 3 and the first-harmonic effective value of the metering output result behind the optical current sensor 2 process digital demodulation signal module 4-1 are judged.When judging that circuit takes place when unusual, notice coefficient correction module 4-4 stops self-healing and proofreaies and correct.Because the time-delay of coefficient correction module 4-4 employing discontinuity is proofreaied and correct, its fault judgement algorithm does not have the real-time requirement, so the realization of the fault judgement algorithm of fault judgement module 4-3 easily, simply effectively.
Algorithm realizes that the coefficient correction module 4-4 of unit 4 is that fault judgement result according to fault judgement module 4-3 carries out, and correction coefficient is by the output u to self-healing adjuster 3
RMetering output u with optical current sensor 2
MComputing obtain, it specifies as follows:
Optical current sensor 2 metering output u
MExpression formula be:
u
M(δ)＝K(δ)·i
1 (10)
Wherein, K (δ) is called transduction factor.Generally speaking, optical current mutual inductor has a definite nominal transformation ratio, and it is meant (such as 20 ℃ of room temperatures) transduction factor when applying rated current under the ambient temperature conditions of determining, is made as K
r, then u is exported in metering
M(δ) can be expressed as:
u
M(δ)＝α(δ)·K
r·i
1 (11)
Wherein, α (δ) is called the coefficient correction factor, and its expression formula is:
Because linear birefrigence δ and Verdet constant V are subjected to the influence of ambient temperature T, so coefficient correction factor-alpha (δ) is the function of temperature, can be designated as α (T), it is an optical current mutual inductor output true cause influenced by ambient temperature.Present embodiment is exported optical current mutual inductor by real-time calculating α (T) and is carried out temperature-compensating, is implemented as follows:
Design self-healing adjuster 3, it is temperature independent based on electromagnetic induction principle, can accurately measure fundamental current i of stable state in-40～+ 60 ℃ temperature range
1(f
1), and make its output u
R(f
1) equal K
rI
1(f
1).So, for measuring fundamental current i of stable state
1(f
1), have following formula to set up:
u
M(f
1，T)＝α(T)·u
R(f
1) (13)
When steady operation, the output u of self-healing adjuster 3
RBy power frequency filtration module 6, the effective value that obtains exporting fundametal compoment is designated as U
R(f
1).Simultaneously, the metering of optical current sensor 2 output u
MAlso by power frequency filtration module 4-2, the effective value that obtains exporting fundametal compoment is designated as U
M(f
1, T).So, can obtain coefficient correction factor-alpha (T):
For the various frequency contents in the tested primary current, the temperature effect performance of optical current mutual inductor output is consistent, and their coefficient correction factor-alpha (T) is consistent.So, comprise the metering output u of the optical current sensor 2 of each harmonic information through after the temperature-compensating
MCan obtain by following formula:
Because the protection of optical current sensor 2 output u
PWith metering output u
MExpression formula be consistent, promptly by metering output u
MThe coefficient correction factor-alpha (T) that calculates is equally applicable to protection output.Like this, also just guaranteed protection output u
PCompensation effect, thereby also guaranteed the transient measuring precision of optical current mutual inductor.
Because temperature is slowly to the influence of optical current mutual inductor measurement result, promptly the variation of coefficient correction factor-alpha (T) is slowly.So coefficient correction can adopt the discontinuity time-delay to proofread and correct, and does not promptly need the continuous real-time working of self-healing adjuster, has reduced the real-time requirement of system, is easy to accurate realization.
When software is realized, according to the fault judgement of fault judgement module 4-3 correction factor correction factor α (T) as a result.When judged result is that circuit does not take place when unusual, replace initial value as the new coefficient correction factor with the mean value α (T) of the N ordered coefficients correction factor α (T) that calculates, realize output result's discontinuity temperature-compensating; But when judged result is circuit when unusual or the break-off of self-healing adjuster take place, the locking correction keeps the unusual preceding coefficient correction factor that calculates constant, output result's temperature-compensating when unusual.
Self-healing optical current transducer described in the utility model has solved the shortcoming of optical current mutual inductor measurement result temperature effect, through test, temperature range homeostasis certainty of measurement at-40～+ 60 ℃ has reached 0.2S level measuring requirement, and transient measuring precision peak-peak instantaneous error is better than ± and 1%.
Claims (8)
1. self-healing optical current transducer is characterized in that it realizes that by optical current sensor (2), self-healing adjuster (3) and algorithm unit (4) forms; Algorithm realization unit (4) is made up of digital demodulation signal module (4-1), power frequency filtration module (4-2), fault judgement module (4-3) and coefficient correction module (4-4); Optical current sensor (2) and self-healing adjuster (3) are installed in respectively on the electric power transmission bus (1), the data-signal output of optical current sensor (2) realizes that with algorithm the data-signal input of digital demodulation signal module (4-1) in the unit (4) links to each other, first signal output part of digital demodulation signal module (4-1) links to each other with the secondary signal input of power frequency filtration module (4-2), the secondary signal output of digital demodulation signal module (4-1) links to each other with first signal input part of coefficient correction module (4-4), the data-signal output of self-healing adjuster (3) realizes that with algorithm the first data-signal input of power frequency filtration module (4-2) in the unit (4) links to each other, the data-signal output of power frequency filtration module (4-2) links to each other with the data-signal input of fault judgement module (4-3), the data-signal output of fault judgement module (4-3) links to each other with the second data-signal input of coefficient correction module (4-4), the data-signal output of coefficient correction module (4-4) links to each other with the signal input part of secondary power equipment, and the data-signal output of coefficient correction module (4-4) is the data-signal output of self-healing optical current transducer.
2. self-healing optical current transducer according to claim 1 is characterized in that self-healing adjuster (3) is made up of underloading coil module (3-1), sample resistance module (3-2), high-voltage suppling power module (3-3), high-pressure side circuit (3-10) and lower-voltage circuit (3-11); High-pressure side circuit (3-10) is made up of overvoltage crowbar (3-4), biasing circuit (3-5), frequency modulation circuit (3-6) and high pressure electro-optical conversion circuit (3-7); Lower-voltage circuit (3-11) is made up of low pressure electro-optical conversion circuit (3-8) and signal demodulating circuit (3-9); The signal input part of underloading coil module (3-1) is the signal input part of self-healing adjuster (3), the signal output part of underloading coil module (3-1) links to each other with the signal input part of sample resistance module (3-2), the signal input part of the overvoltage crowbar (3-4) in the signal output part of sample resistance module (3-2) and the high-pressure side circuit (3-10) links to each other, the signal output part of overvoltage crowbar (3-4) links to each other with the signal input part of biasing circuit (3-5), the signal output part of biasing circuit (3-5) links to each other with the signal input part of frequency modulation circuit (3-6), the signal output part of frequency modulation circuit (3-6) links to each other with the signal input part of high pressure electro-optical conversion circuit (3-7), the signal output part of high pressure electro-optical conversion circuit (3-7) is the signal output part of high-pressure side circuit (3-10), the signal input part of the low pressure electro-optical conversion circuit (3-8) in the signal output part of high pressure electro-optical conversion circuit (3-7) and the lower-voltage circuit (3-11) links to each other, the signal output part of low pressure electro-optical conversion circuit (3-8) links to each other with the signal input part of signal demodulating circuit (3-9), and the signal output part of signal demodulating circuit (3-9) is the data-signal output of self-healing adjuster (3); Four power supply outputs of high-voltage suppling power module (3-3) link to each other with power supply input, the power supply input of biasing circuit (3-5), the power supply input of frequency modulation circuit (3-6) and the power supply input of high pressure electro-optical conversion circuit (3-7) of overvoltage crowbar (3-4) in the high-pressure side circuit (3-10) simultaneously.
3. self-healing optical current transducer according to claim 1 is characterized in that optical current sensor (2) is made up of optical current sensing unit (2-1), light source (2-2), photoelectric detector (2-3) and analog signal processing circuit (2-4); The beam projecting end of light source (2-2) links to each other with the light incident end of optical current sensing unit (2-1), the signal output part of optical current sensing unit (2-1) links to each other with the signal input part of photoelectric detector (2-3), the data-signal output of photoelectric detector (2-3) links to each other with the data-signal input of analog signal processing circuit (2-4), and the data-signal output of analog signal processing circuit (2-4) is the data-signal output of optical current sensor (2).
4. self-healing optical current transducer according to claim 3, it is characterized in that optical current sensing unit (2-1) is made up of two identical sensing units of structure, two identical sensing units of structure relatively are arranged on the both sides of electric power transmission bus (1), described sensing unit is by three optical fiber collimators (2-1-1), the polarizer (2-1-2), vertical bar shaped magneto-optic glass (2-1-3) and analyzer (2-1-4) are formed, first optical fiber collimator (2-1-1) is installed on the side end face of the polarizer (2-1-2), the opposite side end face of the polarizer (2-1-2) links to each other with a side end face of vertical bar shaped magneto-optic glass (2-1-3), the opposite side end face of vertical bar shaped magneto-optic glass (2-1-3) links to each other with a side end face of analyzer (2-1-4), second optical fiber collimator (2-1-1) is installed on the side end face of analyzer (2-1-4), the 3rd optical fiber collimator (2-1-1) is installed on another side of analyzer (2-1-4), the central optical axis of described first optical fiber collimator (2-1-1), the central optical axis of the polarizer (2-1-2), the central optical axis of the central optical axis of vertical bar shaped magneto-optic glass (2-1-3) and second optical fiber collimator (2-1-1) is positioned on the same axis.
5. self-healing optical current transducer according to claim 3, it is characterized in that optical current sensing unit (2-1) is made up of a ring concentrator (2-1-5) and a sensing unit, described sensing unit is by three optical fiber collimators (2-1-1), the polarizer (2-1-2), vertical bar shaped magneto-optic glass (2-1-3) and analyzer (2-1-4) are formed, first optical fiber collimator (2-1-1) is installed on the side end face of the polarizer (2-1-2), the opposite side end face of the polarizer (2-1-2) links to each other with a side end face of vertical bar shaped magneto-optic glass (2-1-3), the opposite side end face of vertical bar shaped magneto-optic glass (2-1-3) links to each other with a side end face of analyzer (2-1-4), second optical fiber collimator (2-1-1) is installed on the side end face of analyzer (2-1-4), the 3rd optical fiber collimator (2-1-1) is installed on another side of analyzer (2-1-4), the central optical axis of described first optical fiber collimator (2-1-1), the central optical axis of the polarizer (2-1-2), the central optical axis of the central optical axis of vertical bar shaped magneto-optic glass (2-1-3) and second optical fiber collimator (2-1-1) is positioned on the same axis, described ring concentrator (2-1-5) is for having the annulus of a fracture, electric power transmission bus (1) is placed on the circle centre position of ring concentrator (2-1-5), described sensing unit is placed in the fracture of ring concentrator (2-1-5), and the axial direction of sensing unit is identical with the tangential direction of ring concentrator (2-1-5).
6. self-healing optical current transducer according to claim 3, the sensing unit that it is characterized in that optical current sensing unit (2-1) is by three optical fiber collimators (2-1-1), the polarizer (2-1-2), block glass shape magneto-optic glass (2-1-6) and analyzer (2-1-4) are formed, electric power transmission bus (1) is placed on the central axis place of block glass shape magneto-optic glass (2-1-6), first optical fiber collimator (2-1-1) is installed on the side end face of the polarizer (2-1-2), the opposite side end face of the polarizer (2-1-2) links to each other with a side end face of block glass shape magneto-optic glass (2-1-6), the opposite side end face of block glass shape magneto-optic glass (2-1-6) links to each other with a side end face of analyzer (2-1-4), second optical fiber collimator (2-1-1) is installed on the side end face of analyzer (2-1-4), the 3rd optical fiber collimator (2-1-1) is installed on another side of analyzer (2-1-4), the central optical axis of described first optical fiber collimator (2-1-1), the central optical axis of the polarizer (2-1-2), the central optical axis of vertical bar shaped magneto-optic glass (2-1-3) is vertical mutually with the central optical axis of second optical fiber collimator (2-1-1).
7. self-healing optical current transducer according to claim 3, the sensing unit that it is characterized in that optical current sensing unit (2-1) is by three optical fiber collimators (2-1-1), the polarizer (2-1-2), sensor fibre (2-1-7) and analyzer (2-1-4) are formed, electric power transmission bus (1) is placed on the circle centre position of the circle that sensor fibre (2-1-7) surrounded, first optical fiber collimator (2-1-1) is installed on the side end face of the polarizer (2-1-2), the opposite side end face of the polarizer (2-1-2) links to each other with a side end face of sensor fibre (2-1-7), the opposite side end face of sensor fibre (2-1-7) links to each other with a side end face of analyzer (2-1-4), second optical fiber collimator (2-1-1) is installed on the side end face of analyzer (2-1-4), and the 3rd optical fiber collimator (2-1-1) is installed on another side of analyzer (2-1-4).
8. self-healing optical current transducer according to claim 3, it is characterized in that analog signal processing circuit (2-4) is by reference voltage module (2-4-1), first differential amplifier circuit (2-4-2), anti-aliasing low-pass filter circuit (2-4-3), block isolating circuit (2-4-4) and second amplifying circuit (2-4-5) are formed, the first data-signal input of first differential amplifier circuit (2-4-2) is the data-signal input of analog signal processing circuit (2-4), the secondary signal input of first differential amplifier circuit (2-4-2) links to each other with the signal output part of reference voltage module (2-4-1), the data-signal output of first differential amplifier circuit (2-4-2) links to each other with the first data-signal input of anti-aliasing low-pass filter circuit (2-4-3) and the data-signal input of block isolating circuit (2-4-4) simultaneously, the data-signal output of block isolating circuit (2-4-4) links to each other with the data-signal input of second amplifying circuit (2-4-5), the data-signal output of second amplifying circuit (2-4-5) links to each other with the second data-signal input of anti-aliasing low-pass filter circuit (2-4-3), and the data-signal output of anti-aliasing low-pass filter circuit (2-4-3) is the data-signal output of analog signal processing circuit (2-4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201008471U CN201438414U (en) | 2009-09-11 | 2009-09-11 | Self-healing optical current mutual inductor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009201008471U CN201438414U (en) | 2009-09-11 | 2009-09-11 | Self-healing optical current mutual inductor |
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| CN201438414U true CN201438414U (en) | 2010-04-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435829A (en) * | 2011-10-28 | 2012-05-02 | 哈尔滨工业大学 | Optical voltage sensor and self-calibration method for realizing sensor |
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2009
- 2009-09-11 CN CN2009201008471U patent/CN201438414U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435829A (en) * | 2011-10-28 | 2012-05-02 | 哈尔滨工业大学 | Optical voltage sensor and self-calibration method for realizing sensor |
| CN102435829B (en) * | 2011-10-28 | 2013-08-14 | 哈尔滨工业大学 | Self-calibration method for optical voltage sensor |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20100414 Effective date of abandoning: 20090911 |