CN105606876A - Three-core power cable phase current detection method based on magnetic sensors - Google Patents
Three-core power cable phase current detection method based on magnetic sensors Download PDFInfo
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- CN105606876A CN105606876A CN201610086432.8A CN201610086432A CN105606876A CN 105606876 A CN105606876 A CN 105606876A CN 201610086432 A CN201610086432 A CN 201610086432A CN 105606876 A CN105606876 A CN 105606876A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention relates to a three-core power cable phase current detection method based on magnetic sensors and belongs to the current detection technology field for electromagnetic measurement. The method comprises steps that the three magnetic sensors with intervals of 120 DEG are employed, magnitudes of tangential components of a surface magnetic field of a three-core power cable along the cable circumferential direction are measured; the three sensors are collimated with cores of A, B and C phases of the three-core power cable; a de-coupling algorithm is employed, and current magnitudes and directions of the cores of the A, B and C phases of the three-core power cable can be directly acquired according to values outputted by the three magnetic sensors and circumferential geometric dimensions of the three-core power cable. Through the method, change of the surface circumferential magnetic field of the three-core power cable is detected, effective detection on current of each core of each phase in the three-core power cable can be realized, a problem that a traditional inductive current measurement device can not measure current of each phase of a three-core power cable in the prior art can be solved, and real-time online detection on current of each phase of the three-core power cable can be realized on the basis of the method.
Description
Technical field
The present invention relates to a kind of three core power cable phase current detection methods based on Magnetic Sensor, belong in electromagnetic measurementCurrent detection technology field.
Background technology
Three core power cables are often applied in the power transmission engineering below 35kV. Three core power cable A, the each phase heart yearn of B, C itBetween, be uniformly distributed along 120 degree of being circumferentially separated by between two, and three-phase heart yearn uses common shielding protection layer. For guaranteeing that city suppliesThe safe and stable operation of electric system, great to the real-time Clinical significance of detecting of power cable phase current. In principle, can be by realTime detect the variation of each phase heart yearn electric current in three core power cables, the running status of the each phase of cable is assessed, to ensure threeNormal, the reliability service of core power cable. But, to three core electric power electricity of the shared same shielding protection layer of this three-phase heart yearnCable, the electric current detecting method based on electromagnetic induction principle of conventional art cannot be employed, this be because: at three core power cablesUnder normal operation, wherein the electric current of three-phase heart yearn balances each other, and external equivalent current is zero, thereby any through this cableThe total magnetic flux of cross section is also zero; Can not be, the magnetic changing in magnetic induction plane around the circumferential plane of cableFlux, therefore, cannot measure in the each phase heart yearn of this cable with traditional electric current detecting method based on electromagnetic induction principleElectric current.
Along with the extensive application of power cable in power supply system, the security of its operation more and more comes into one's own.For realizing the on-line monitoring to Operation Condition for Power Cable, one is method comparatively reliably, is that monitoring cable is in actual motionThe situation of change of each phase heart yearn electric current, and based on this, the running status of power cable is assessed. As mentioned above, with traditionThe detection method based on electromagnetic induction principle and measurement mechanism, cannot realize the survey to the each phase heart yearn of three core power cables electric currentAmount, and current existing power cable detection method and checkout gear are also to realize indirectly reflecting cable operation characteristic mostlyThe measurement of relevant parameter, as cable temperature measurement etc. The result of indirectly measuring, although also can reflect whether power cable existsDefect, whether there is the hidden danger that is about to break down, the fault that occurs etc. even, postpone but measure to exist, and can not be clear and definite, there is larger limitation in diagnosis defect or location of fault and type.
Summary of the invention
The object of this invention is to provide a kind of three core power cable phase current detection methods based on Magnetic Sensor, set up threeThe physical mathematics model of relation between core power cable surface Circumferential field and the each phase heart yearn of this cable electric current, by detecting three coresThe variation of power cable surface Circumferential field, realizes the effective detection to each phase heart yearn electric current in three core power cables, solves the back of the bodyThe problems referred to above that scape technology exists.
Technical scheme of the present invention is:
Based on three core power cable phase current detection methods of Magnetic Sensor, adopt three Magnetic Sensors that differ 120 degree,Measure the size of three core power cable Surface fields along the circumferential tangential component of cable; Three Magnetic Sensors respectively with three core electric powerA, the B of cable, the heart yearn of the each phase of C collimation; Adopt decoupling algorithm, by indicating value and this three cores electric power electricity of three Magnetic Sensor outputsThe physical dimension that cable is circumferential, directly obtains the size and Orientation of electric current in this three core power cable A, the each phase heart yearn of B, C.
Described three Magnetic Sensors, by frame for movement, spend and are fixed in this along the circumferential mutual deviation 120 of three core power cablesThe outer surface of cable, goes to measure magnetic field along the circumferential tangential component of three core power cable outer surfaces; Each Magnetic Sensor is fixedOn the line at this cable center of circle and corresponding phase heart yearn center; Three Magnetic Sensors are upwards solid in three core power cable outer surface weeksFixed position, consistent with the position of the each phase heart yearn of this three core power cable.
Described employing decoupling algorithm, by indicating value and the circumferential dimensioning of this three core power cable of three Magnetic Sensor outputsVery little, directly obtain the size and Orientation of electric current in this three core power cable A, the each phase heart yearn of B, C; Adopt three in each phase heart yearnThe electric line source at center, simulation produces the Distribution of Magnetic Field on three core power cable surfaces; According to Ampère circuital theorem, determine each lineThe Distribution of Magnetic Field that current source produces in Magnetic Sensor position; Magnetic field based on Magnetic Sensor place and the corresponding relation of electric line source,Set up taking electric line source size as unknown quantity, three core power cables surfaces Circumferential fields are the equation of known quantity; Based on above-mentionedThe amount of knowing, namely three magnetic field sensor places are along the tangential component in the circumferential magnetic field of three core power cable outer surfaces, unknown quantity, alsoBe exactly the physics contact between three-phase current, set up a system of linear equations that comprises three independent equations; By solving this lineProperty equation group, obtains the size and Orientation of electric current in the each phase heart yearn of three core power cables.
Beneficial effect of the present invention: set up between three core power cable surface Circumferential fields and the each phase heart yearn of this cable electric currentThe physical mathematics model of relation, by detecting the variation of three core power cable surface Circumferential fields, realizes three core power cablesIn effective detection of each phase heart yearn electric current; Solve with traditional induction type current measuring device and cannot measure three core power cablesA difficult problem for each phase current, by each phase current in three core power cable surface measurement Magnetic Field are determined cable size andChange, in theory, can realize the real-time online of each phase current in three core power cables is detected based on it.
Brief description of the drawings
Fig. 1 is the present invention's three core power cable structures and each current phasor measurement principle schematic;
Cable center is O, and A, B, C are the position of three-phase heart yearn, and cable center is r to the distance of A, B, C three-phase heart yearn; OA,OB, OC are mutually 120 degree angles; The position that SA, SB, SC are Magnetic Sensor, they are R to the distance of the O of cable center; Magnetic SensorThe n durection component that the magnetic induction intensity in measurement magnetic field and cable outer surface are circumferential tangent;
Fig. 2 is the input waveform of A, B, C three-phase current in finite element simulation calculated examples of the present invention;
Fig. 3 is that in the embodiment of the present invention, finite element simulation calculates SA, the SB of gained and the magnetic induction intensity at SC place dividing along n directionMeasure time dependent function;
Between the amount that Fig. 4 is the present invention utilizes proposed Magnetic Sensor output and each phase current, the physical mathematics model of relation, countsCalculation reappears the waveform of the each phase heart yearn of the three core power cables electric current;
Fig. 5 is under three-phase current symmetrical balance condition of the present invention, and the magnetic induction intensity that SA, SB in calculated examples, SC are 3 is along n sideTo component and phase current magnitude between linear relationship.
Detailed description of the invention
Below in conjunction with accompanying drawing, by embodiment, the invention will be further described.
Based on three core power cable phase current detection methods of Magnetic Sensor, adopt three magnetic that differ 120 degree to passSensor, measures the size of three core power cable Surface fields along the circumferential tangential component of cable; Three Magnetic Sensors are respectively with threeA, the B of core power cable, the heart yearn of the each phase of C collimation; Adopt decoupling algorithm, by indicating value and this three core of three Magnetic Sensor outputsThe physical dimension that power cable is circumferential, directly obtains the size and Orientation of electric current in this three core power cable A, the each phase heart yearn of B, C.
Described three Magnetic Sensors, by frame for movement, spend and are fixed in this along the circumferential mutual deviation 120 of three core power cablesThe outer surface of cable, goes to measure magnetic field along the circumferential tangential component of three core power cable outer surfaces; Each Magnetic Sensor is fixedOn the line at this cable center of circle and corresponding phase heart yearn center; Three Magnetic Sensors are upwards solid in three core power cable outer surface weeksFixed position, consistent with the position of the each phase heart yearn of this three core power cable.
Described employing decoupling algorithm, by indicating value and the circumferential dimensioning of this three core power cable of three Magnetic Sensor outputsVery little, directly obtain the size and Orientation of electric current in this three core power cable A, the each phase heart yearn of B, C; Adopt three in each phase heart yearnThe electric line source at center, simulation produces the Distribution of Magnetic Field on three core power cable surfaces; According to Ampère circuital theorem, determine each lineThe Distribution of Magnetic Field that current source produces in Magnetic Sensor position; Magnetic field based on Magnetic Sensor place and the corresponding relation of electric line source,Set up taking electric line source size as unknown quantity, three core power cables surfaces Circumferential fields are the equation of known quantity; Based on above-mentionedThe amount of knowing, namely three magnetic field sensor places are along the tangential component in the circumferential magnetic field of three core power cable outer surfaces, unknown quantity, alsoBe exactly the physics contact between three-phase current, set up a system of linear equations that comprises three independent equations; By solving this lineProperty equation group, obtains the size and Orientation of electric current in the each phase heart yearn of three core power cables.
The present invention is embodiment more specifically:
As shown in Figure 1, cable center is O to the structure of three core power cables that simulation modeling of the present invention uses, and A, B, C are three-phaseThe position of heart yearn, cable center is r to the distance of A, B, C three-phase heart yearn. Without loss of generality, y axle can be overlapped with OA, APoint coordinate be (0, r). Cable center is to the vector of B, C two-phase heart yearn, i.e. OB, OC, with the angle of x axle be respectively 210 degree,330 degree, therefore B point coordinates be (R/2 ,-r/2), C point coordinates be (R/2 ,-r/2). The electric current of A, B, C three-phase heart yearnBe respectively IA、IBAnd IC。
Magnetic Sensor installation site SA, SB, SC, be respectively the intersection point of OA, OB, OC extended line and cable surface. SA, SB,SC is R to the radius of cable center. Adjust the angle of Magnetic Sensor, the magnetic induction intensity that Magnetic Sensor is measured is respectivelyThe magnetic induction intensity that SA, SB, SC are 3 is along the circumferential tangential component of cable outer surface.
According to Ampère circuital theorem, A phase heart yearn electric current IAThe magnetic induction intensity producing at SA place is
（1）
Wherein, μ0For space permeability.
For simplicity, to Magnetic Sensor, definition is n along circumferential direction, and direction is radially r, as shown in Figure 1.Obviously, in formula (1), magnetic induction intensity is the component of n direction.
Similarly, B phase current IBThe magnetic induction intensity producing at SA place is
（2）
Magnetic induction density B shown in formula (2)SA-BDirection be
（3）
Therefore BSA-BComponent along n direction is
（4）
In like manner, C phase current ICThe magnetic induction intensity producing at SA place is
（5）
Magnetic induction density B shown in formula (2)SA-CDirection be
（6）
Therefore BSA-CComponent along n direction is
（7）
Simultaneous formula (2), formula (4) and formula (7), can obtain SA place, and the magnetic induction intensity jointly being produced by A, B, C three-phase current is along n sideTo component be
（8）
Consider the symmetry having in three core power cable structures, solving SB, SC place is produced jointly by A, B, C three-phase currentMagnetic induction intensity time, x and y reference axis can be rotated. For example, jointly produced by A, B, C three-phase current solving SB placeMagnetic induction intensity time, can be by y axle rotation to overlapping with OB. Under this condition, the angle of OC, OA and x axle is respectively 210 degree, 330Degree. Therefore,, when calculating, only need the corresponding phase current of rotation. Adopt the method, can obtain SB place by A, B, C three-phase current altogetherWith the magnetic induction intensity producing along the component of n direction be
（9）
In like manner, adopt similar method, can obtain SC place by the common magnetic induction intensity producing of A, B, C three-phase current along n directionComponent is
（10）
When measurement, due to BSA-n、BSB-nAnd BSC-nFor the output quantity of Magnetic Sensor, simultaneous formula (8), formula (9) and formula (10) compositionSystem of linear equations, just can solve phase current IA、IBAnd IC, obtain the phase current value of three core power cables. Solve phase currentIA、IBAnd ICExpression formula be
（11）
（12）
（13）
Formula (11), formula (12) and formula (13), the phase current value and SA, SB, the SC place that have set up three core power cables are passed by magneticThe relation of the magnetic induction intensity value that sensor records.
For verifying the validity of the three core power cable current phasor measurement new methods based on Magnetic Sensor that propose, adoptThree core power cable computation models of a finite element simulation, the time dependent function in magnetic field at acquisition SA, SB, SC place. MeterWhen calculation, the parameter of cable arranges as follows: R=45mm, r=20mm, IA=90A，IB=100A，IC=110A; Half of A, B, C three-phase heart yearnFootpath is 12.5mm. FEM model calculates the phase current that adopts as shown in Figure 2. SA, the SB of emulation gained and the magnetic strength at SC placeAnswer intensity to see Fig. 3 along the time dependent curve of component of n direction.
Then,, using the time dependent curve of magnetic induction intensity at the SA shown in Fig. 3, SB, SC place as known conditions, adoptThe physical mathematics model of setting up by patent of the present invention, removes to solve the phase current I of three core power cablesA、IBAnd IC. If institute solvesThe phase current value that the phase current value going out is inputted during with FEM calculation is consistent, proves to measure three cores based on Magnetic SensorThe new method of power cable phase current is effective, feasible.
Fig. 4 has provided the electricity of three core power cables each phase that the physical mathematics model that adopts in patent of the present invention calculatesFlow time dependent curve. Be not difficult to find out, the phase current value of result of calculation and FEM calculation input is almost in full accord,Verified that patent of the present invention sets up the correctness of physical mathematics model.
For further characterize magnetic induction intensity that Magnetic Sensor records at SA, SB, SC place along the circumferential tangential n component of cableBnWith the relation of three core power cable phase currents, Fig. 5 has provided above-mentioned calculated examples under three-phase current symmetrical balance condition, everyRelation between magnetic induction intensity and phase current magnitude that individual Magnetic Sensor records. Can find out, in the each phase of three core power cablesUnder electric current symmetrical balance condition, SA, SB, SC place are along the component B of the tangential n of the circumferential magnetic induction intensity of this cablenWith phase currentAmplitude is directly proportional. This shows that the current phasor measurement new method of this kind based on Magnetic Sensor can reflect three core electric power electricity linearlyThe variation of the each phase heart yearn of cable electric current.
Claims (3)
1. three core power cable phase current detection methods based on Magnetic Sensor, is characterized in that: adopt three and differ 120The Magnetic Sensor of degree, measures the size of three core power cable Surface fields along the circumferential tangential component of cable; Three Magnetic SensorsRespectively with A, the B of three core power cables, the heart yearn collimation of the each phase of C; Adopt decoupling algorithm, by the indicating value of three Magnetic Sensor outputsThe physical dimension circumferential with this three core power cable, directly obtains the large of electric current in this three core power cable A, the each phase heart yearn of B, CLittle and direction.
2. a kind of three core power cable phase current detection methods based on Magnetic Sensor according to claim 1, its featureBe: described three Magnetic Sensors, by frame for movement, spend and be fixed in this electricity along the circumferential mutual deviation 120 of three core power cablesThe outer surface of cable, goes to measure magnetic field along the circumferential tangential component of three core power cable outer surfaces; Each Magnetic Sensor is fixed onOn the line at this cable center of circle and corresponding phase heart yearn center; Three Magnetic Sensors are upwards fixing in three core power cable outer surface weeksPosition, consistent with the position of the each phase heart yearn of this three core power cable.
3. a kind of three core power cable phase current detection methods based on Magnetic Sensor according to claim 1 and 2, its spyLevy and be: described employing decoupling algorithm, by indicating value and the circumferential dimensioning of this three core power cable of three Magnetic Sensor outputsVery little, directly obtain the size and Orientation of electric current in this three core power cable A, the each phase heart yearn of B, C; Adopt three in each phase heart yearnThe electric line source at center, simulation produces the Distribution of Magnetic Field on three core power cable surfaces; According to Ampère circuital theorem, determine each lineThe Distribution of Magnetic Field that current source produces in Magnetic Sensor position; Magnetic field based on Magnetic Sensor place and the corresponding relation of electric line source,Set up taking electric line source size as unknown quantity, three core power cables surfaces Circumferential fields are the equation of known quantity; Based on above-mentionedThe amount of knowing, namely three magnetic field sensor places are along the tangential component in the circumferential magnetic field of three core power cable outer surfaces, unknown quantity, alsoBe exactly the physics contact between three-phase current, set up a system of linear equations that comprises three independent equations; By solving this lineProperty equation group, obtains the size and Orientation of electric current in the each phase heart yearn of three core power cables.
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| CN106018942A (en) * | 2016-06-28 | 2016-10-12 | 清华大学 | Current sensor array used for measuring three-phase current and measuring method thereof |
| CN108089049A (en) * | 2017-12-26 | 2018-05-29 | 国网冀北电力有限公司唐山供电公司 | The method that each cored wire electric current of three core power cables and Magnetic Sensor mounting shift angle are measured with Magnetic Sensor |
| CN108107256A (en) * | 2017-12-21 | 2018-06-01 | 国网冀北电力有限公司唐山供电公司 | A kind of three core power cable Circumferential field Equivalent analysis methods |
| CN108802831A (en) * | 2018-04-18 | 2018-11-13 | 国网冀北电力有限公司唐山供电公司 | A method of measuring three core power cable core wire positions |
| CN108828289A (en) * | 2018-04-18 | 2018-11-16 | 国网冀北电力有限公司唐山供电公司 | A kind of method of the eccentric error of Magnetic Sensor measurement each phase core wire electric current of three core power cables |
| CN109030925A (en) * | 2018-06-25 | 2018-12-18 | 国网冀北电力有限公司唐山供电公司 | A kind of three-core cable phase current wireless supervisory control system |
| CN109212296A (en) * | 2018-10-23 | 2019-01-15 | 电子科技大学 | A kind of non-contact electric current measurement device monitored simultaneously suitable for three-phase current |
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| CN106018942A (en) * | 2016-06-28 | 2016-10-12 | 清华大学 | Current sensor array used for measuring three-phase current and measuring method thereof |
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| CN108089049A (en) * | 2017-12-26 | 2018-05-29 | 国网冀北电力有限公司唐山供电公司 | The method that each cored wire electric current of three core power cables and Magnetic Sensor mounting shift angle are measured with Magnetic Sensor |
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| CN111771128A (en) * | 2018-03-01 | 2020-10-13 | 横河电机株式会社 | Current measuring device, current measuring method, and computer-readable non-transitory recording medium |
| CN111771128B (en) * | 2018-03-01 | 2023-03-31 | 横河电机株式会社 | Current measuring device, current measuring method, and computer-readable non-transitory recording medium |
| CN108802831A (en) * | 2018-04-18 | 2018-11-13 | 国网冀北电力有限公司唐山供电公司 | A method of measuring three core power cable core wire positions |
| CN108828289A (en) * | 2018-04-18 | 2018-11-16 | 国网冀北电力有限公司唐山供电公司 | A kind of method of the eccentric error of Magnetic Sensor measurement each phase core wire electric current of three core power cables |
| CN108828289B (en) * | 2018-04-18 | 2020-07-14 | 国网冀北电力有限公司唐山供电公司 | Method for measuring eccentricity error of current of core wire of each phase of three-core power cable by magnetic sensor |
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| CN109212296B (en) * | 2018-10-23 | 2021-01-26 | 电子科技大学 | Non-contact current measuring device suitable for three-phase current simultaneous monitoring |
| CN109212296A (en) * | 2018-10-23 | 2019-01-15 | 电子科技大学 | A kind of non-contact electric current measurement device monitored simultaneously suitable for three-phase current |
| CN110118888A (en) * | 2019-03-04 | 2019-08-13 | 合肥科大立安安全技术有限责任公司 | A kind of electric wiring electric current detecting method based on Magnetic sensor |
| CN111999543A (en) * | 2020-07-21 | 2020-11-27 | 云南电网有限责任公司临沧供电局 | Magnetic induction type current calculation method suitable for parallel three-phase line fault line selection |
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| CN113820532A (en) * | 2021-09-23 | 2021-12-21 | 南方电网数字电网研究院有限公司 | Non-contact double-core cable current measuring method and device |
| CN113820532B (en) * | 2021-09-23 | 2022-04-15 | 南方电网数字电网研究院有限公司 | Non-contact double-core cable current measuring method and device |
| CN114976992A (en) * | 2022-06-22 | 2022-08-30 | 广东电网有限责任公司 | Cable support adjusting method and device, electronic equipment and storage medium |
| CN116932977A (en) * | 2023-09-15 | 2023-10-24 | 华中科技大学 | Three-phase cable current non-contact rapid measurement method, device and system |
| CN116932977B (en) * | 2023-09-15 | 2023-12-12 | 华中科技大学 | Three-phase cable current non-contact rapid measurement method, device and system |
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Inventor after: Yuan Yanling Inventor after: Gao Zhongqiang Inventor after: Tian Xincheng Inventor after: Li Yan Inventor after: Gao Ling Inventor after: Dong Jie Inventor after: Li Shisong Inventor after: Zhao Wei Inventor after: Li Naixin Inventor after: Zhu Changrong Inventor after: Yang Baokun Inventor after: Mu Yong Inventor after: Zhang Jianjun Inventor before: Yuan Yanling Inventor before: Zhang Xishu Inventor before: Liang Dong Inventor before: Zhu Xiaoling Inventor before: Liu Yaxin Inventor before: Mu Yong Inventor before: Dong Jie Inventor before: Li Shisong Inventor before: Zhao Wei Inventor before: Gao Zhongqiang Inventor before: Tian Xincheng Inventor before: Gao Junfu Inventor before: Xia Fuqing Inventor before: Yuan Jijun |
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Application publication date: 20160525 |