CN111753450A - Optical current sensor optimization design method - Google Patents
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Abstract
An optical current sensor optimization design method comprises establishing a theoretical model, and analyzing the distribution uniformity of a magnetic field on magneto-optical glass; simulating the magnetic field distribution of optical current sensors with different structures; comparing the magnetic field distribution of the optical current sensor caused by the length, width and radius changes of the iron core; adjusting geometric parameters of magneto-optical glass, and observing the influence on the magnetic field distribution of the optical current sensor; adjusting the geometric parameters of the coil structure, and observing the influence on the magnetic field distribution of the optical current sensor; the length, the width and the radius of the iron core are selected to be proper, the proper parameters are determined by mutual influence of geometric parameters of the magneto-optical glass and the coil structure, and the optical current sensor is optimally designed. The method designs the accuracy of the optical current sensor by comparing the magnetic field distribution of the optical current sensor, realizes miniaturization at the same time, and has the advantages of simplicity, accuracy and high efficiency.
Description
Technical Field
The invention discloses an optical current sensor optimization design method, which is used for realizing the accuracy and miniaturization design of a current sensor.
Background
Currently, good operation of power systems is closely related to current sensors. In recent hundred years, the traditional electromagnetic current transformer has been widely applied due to the advantages of mature measurement technology, simple structure, difficult damage and the like; with the increasing scale of power grids and the continuous development of operation mechanisms, due to the particularity of the structure and the use conditions, the problems of low safety, serious electromagnetic interference, poor environmental friendliness, influence on measurement accuracy due to the magnetic saturation phenomenon, high cost, high assembly difficulty and the like are generally exposed under the condition that the voltage level of a power system is continuously improved. The optical current sensor theoretically has the functions of the traditional electromagnetic current sensor, can overcome the defects, and also has the advantages of passive high-voltage side, good insulating property, wide dynamic range, quick fault response and the like, so the optical current sensor becomes the mainstream of a new mutual inductor in high-voltage and high-current. Therefore, the improvement of the accuracy of the optical current sensor has important significance for the safe operation of the power system.
Disclosure of Invention
The invention provides an optical current sensor optimization design method, which simulates the influence of the geometric parameters of iron core materials, magneto-optical glass and coil structures on the magnetic field distribution of an optical current sensor by utilizing finite element multi-physical field analysis software, performs relevant processing on the obtained relevant data, comprehensively judges and selects proper geometric parameters, and improves the measurement accuracy of the optical current sensor. The method designs the accuracy of the optical current sensor by comparing the magnetic field distribution of the optical current sensor, realizes miniaturization, and has the advantages of simplicity, accuracy and high efficiency.
The technical scheme adopted by the invention is as follows:
an optical current sensor optimization design method comprises the following steps:
step 1: establishing a theoretical model, and analyzing the distribution uniformity of the magnetic field on the magneto-optical glass;
step 2: simulating the magnetic field distribution of optical current sensors with different structures;
and step 3: comparing the magnetic field distribution of the optical current sensor caused by the length, width and radius changes of the iron core to respectively obtain the influence relationship of the length, width and radius changes of the iron core on the magnetic field distribution;
and 4, step 4: adjusting geometric parameters of the magneto-optical glass, observing the influence on the magnetic field distribution of the optical current sensor, and obtaining the influence relation of the length and radius change of the magneto-optical glass on the magnetic field intensity;
and 5: adjusting the geometric parameters of the coil structure, observing the influence on the magnetic field distribution of the optical current sensor, and obtaining the influence relation of the radius and the number of turns of the coil on the magnetic field intensity change;
step 6: selecting proper iron core length, width and radius, determining proper parameters through mutual influence of geometric parameters of the magneto-optical glass and the coil structure, judging the moment when the magnetic field intensity of the optical current sensor is maximum, recording the iron core structure parameters, the magneto-optical glass and the coil structure at the moment, and optimally designing the optical current sensor.
The invention discloses an optical current sensor optimization design method, which has the following technical effects:
1) according to the invention, the relevant parameter comparison of the optical current sensor is obtained through finite element analysis software simulation, and an effective technical method is provided for optimizing the accuracy of the optical current sensor of the power system.
2) The method is suitable for optimizing and improving the accuracy of the current sensor of the power system, and can provide safety guarantee for the safe operation of the power system.
3) The invention is different from the design of other detection equipment, and has the advantage of miniaturization design of the detection equipment based on the technology of improving the magnetic field intensity.
4) The invention is based on improving the intensity of magnetic field distribution, and based on the influence of the sensor iron core material, magneto-optical glass and the coil structure on the magnetic field distribution of the optical current sensor, the magnetic field intensity generated by the iron core type optical current sensor is larger, and the accuracy is higher; the smaller the length of the magneto-optical glass, the larger the number of turns of the coil, and the larger the magnetic field intensity, thereby being beneficial to the advantage of miniaturization design.
Drawings
Fig. 1 is a model diagram of a sensor based on an iron core magnetic ring type.
FIG. 2 is a flow chart of the present invention.
Fig. 3(1) is a first graph of the magnetic field distribution calculation result of the magnetic flux ring type optical current transformer;
fig. 3(2) is a second graph of the magnetic field distribution calculation result of the magnetic convergence ring type optical current transformer.
Fig. 4(1) is a first graph of the magnetic field distribution calculation result of the iron-core optical current transformer;
fig. 4(2) is a second graph of the magnetic field distribution calculation result of the iron-core optical current transformer.
FIG. 5(1) is a diagram of the magnetic field distribution calculation result of parameters of a scheme (i) of the iron core type sensor;
FIG. 5(2) is a diagram of the magnetic field distribution calculation result of the iron core type sensor scheme (II) parameters;
FIG. 5(3) is a diagram showing the result of the magnetic field distribution calculation of the parameters of the iron core type sensor scheme (c);
fig. 5(4) is a diagram of the magnetic field distribution calculation result of the parameter of the iron core type sensor scheme (iv).
FIG. 6(1) is a graph of the results of a magneto-optical glass solution 1# parameter calculation on the magnetic field distribution of an optical current sensor;
FIG. 6(2) is a graph of the results of a magneto-optical glass solution 2# parameter calculation on the magnetic field distribution of an optical current sensor;
FIG. 6(3) is a graph of the results of a magneto-optical glass solution 3# parameter versus magnetic field distribution for an optical current sensor;
fig. 6(4) is a graph of the results of calculation of the magneto-optical glass solution 4# parameters for the magnetic field distribution of the optical current sensor.
FIG. 7(1) is a diagram showing the calculation result of the parameters of scheme I of the coil structure on the magnetic field distribution of the optical current sensor;
FIG. 7(2) is a graph of the magnetic field distribution calculation results of the scheme II parameters of the coil structure for the optical current sensor;
FIG. 7(3) is a diagram of the calculation result of the parameters of scheme III of the coil structure on the magnetic field distribution of the optical current sensor;
fig. 7(4) is a diagram of the calculation result of the scheme iv parameters of the coil structure on the magnetic field distribution of the optical current sensor.
Detailed Description
An optical current sensor optimization design method is characterized in that on the premise of meeting a certain theoretical model, simulation of magnetic field distribution of optical current sensors with different structures and simulation of influences of materials of parts of an iron core sensor, magneto-optical glass and geometric parameters of a coil structure on the magnetic field intensity of the optical current sensor are carried out; the method comprises the steps of selecting proper iron core length, width and radius, determining proper parameters through mutual influence of geometric parameters of magneto-optical glass and a coil structure, judging the moment when the magnetic field intensity of the optical current sensor is maximum, and recording the geometric parameters of the iron core structure, the magneto-optical glass and the coil structure at the moment to enable workers to manufacture the optical current sensor with high accuracy.
The method comprises the following steps:
step 1: establishing a theoretical model, and analyzing the distribution uniformity of the magnetic field on the magneto-optical glass;
the theoretical model is established as follows:
P1、P2the magnetic field intensity of the two points along the optical path direction is respectively H1/l、H2/lThis can be expressed as follows:
H1/l＝cosθI/2πR1
H2/l＝I/2πR2；
R1、R2is P1、P2The distance between two points and the current-carrying conductor, theta being P1Magnetic field intensity H of point along optical path direction1/lThe angle between the light wave and the light wave.
Wherein, has R1>R2And cos θ<1, therefore H1/l<H2/lI.e. the magnetic field is not uniformly distributed along the optical path of the magneto-optical glass, the integral average value H of the magnetic field on the magneto-optical glass mediumaveCan be expressed as:
Have＝θI/2πL
wherein L represents the magneto-optical glass length.
If p is1、p2The current magnitude I of the position is not changed, then p1And p2Integrated average H of magnetic field over magneto-optical glass medium in both casesaveAnd the consistency is maintained. For lumped parameters, the same uniform magnetic field means the same medium model, and in both casesAnd the optical path output of the optical current transformer calculated by the theoretical model is also the same. The centralized parameter means that when the size of the circuit is far smaller than the wavelength of a signal passing through the circuit (meanwhile, the signal frequency is lower), the circuit does not radiate electromagnetic waves outwards, the energy of the whole circuit is kept conservative, and the kirchhoff law is met.
The step 1 of establishing the theoretical model has the advantages that: because the inhomogeneous magnetic field problem can adversely affect current sensing, the creation of inhomogeneous magnetic fields can be avoided. The theoretical model aims at MOCT, a sensing glass material is a short straight cuboid, a magnetic field generated by a phase conductor is in a circumferential shape, the magnetic field is unevenly distributed along a sensing optical path due to mismatching of a medium material and the magnetic field, and when the theoretical model is applied to an uneven magnetic field environment, the magnetic field integral average value of the medium optical path is taken as an even magnetic field for analysis, so that the theoretical model can accurately analyze the distribution uniformity of the magnetic field on magneto-optical glass.
The material properties of each part of the core sensor are shown in table 1 below.
TABLE 1 iron core type sensor material attribute table
Step 2: the magnetic field distribution of the optical current sensors with different structures is simulated:
the magnetic field distribution of the magnetic gathering ring type optical current sensor and the magnetic field distribution of the iron core type optical current sensor with two different structures are simulated through finite element analysis software, the magnetic field intensity distribution of the magnetic gathering ring type optical current sensor and the magnetic field intensity distribution of the iron core type optical current sensor are uniform, and the magnetic field distribution intensity of the iron core type optical current sensor is larger than that of the magnetic gathering ring type optical current sensor.
And step 3: comparing the magnetic field distribution of the optical current sensor caused by the length, width and radius changes of the iron core, and respectively obtaining the influence relation of the length, width and radius changes of the iron core on the magnetic field distribution:
the length of the magneto-optical glass is kept unchanged, and when the length of the iron core is increased, the magnetic field intensity is almost unchanged; the length change of the iron core has little influence on the magnetic field intensity. When the radius of the iron core is reduced, the magnetic field intensity is reduced; when the width of the iron core is increased, the magnetic field intensity is increased; the influence of changing the radius of the iron core on the intensity of magnetic field distribution is the largest, and the influence of changing the length and the width is small and can be basically ignored, so that the magnetic field intensity of the sensor can be improved by selecting the larger radius of the iron core, and the accuracy is further improved.
And 4, step 4: adjusting geometric parameters of the magneto-optical glass, observing the influence on the magnetic field distribution of the optical current sensor, and obtaining the influence relation of the length and radius change of the magneto-optical glass on the magnetic field intensity:
keeping the geometric structure of the iron core unchanged, changing the length of the magneto-optical glass, and increasing the magnetic field intensity greatly when the length of the magneto-optical glass is reduced; the magnetic field intensity can also be changed by changing the radius of the magneto-optical glass, and when the radius of the magneto-optical glass is smaller, the magnetic field is larger, but the change amplitude is smaller and can be ignored.
And 5: adjusting the geometric parameters of the coil structure, observing the influence on the magnetic field distribution of the optical current sensor, and obtaining the influence relation of the radius and the number of turns of the coil on the magnetic field intensity change:
the length of the magneto-optical glass is influenced by the number of turns of the coil and the axial pitch, the more the number of turns of the coil is, the larger the magnetic field intensity is, the larger the axial pitch is, and under the condition of the same number of turns of the coil, the length of the coil can be increased, and the length of the corresponding magneto-optical glass also changes; the optimal parameter for the coil is the minimum axial pitch, which is related to the coil radius, the smaller the coil length can be.
Step 6: selecting proper iron core length, width and radius, determining proper parameters through mutual influence of geometric parameters of the magneto-optical glass and the coil structure, judging the moment when the magnetic field intensity of the optical current sensor is maximum, recording the iron core structure parameters, the magneto-optical glass and the coil structure at the moment, and optimally designing the optical current sensor. The change of the radius of the iron core and the change of the length of the magneto-optical glass have great influence on the change of the magnetic field intensity, and the smaller the length of the magneto-optical glass is, the larger the magnetic field intensity is, thereby being beneficial to the miniaturization design; the radius of the magneto-optical glass has almost no influence on the magnetic field intensity; the coil structure with smaller radius and less turns is selected, so that the magnetic field intensity of the optical current sensor can be improved, and the accuracy is further improved.
The detection is performed according to the flow of fig. 2, and the magnetic field distribution diagrams of the optical current sensors with two different structures are shown in fig. 3(1), fig. 3(2), fig. 4(1) and fig. 4 (2).
Fig. 3(1) is a graph of a magnetic field distribution calculation result of the magnetic flux concentration ring type optical current transformer, and the magnetic field distribution of the magnetic flux concentration ring type optical current transformer obtained from fig. 3(1) is uniform and spiral.
Fig. 3(2) is a second graph of the magnetic field distribution calculation result of the magnetic flux concentration ring type optical current transformer, and the magnetic field distribution of the magnetic flux concentration ring type optical current transformer obtained from fig. 3(2) is uniform and has weaker magnetic field distribution strength compared with the iron core type structure.
Fig. 4(1) is a first graph of a magnetic field distribution calculation result of the iron core type optical current transformer, and it is obtained from fig. 4(1) that the magnetic field intensity distribution of the iron core type optical current transformer is uniform, and the magnetic field intensity distribution can also be 6 times that of the magnetic gathering ring type transformer.
Fig. 4(2) is a second diagram of the magnetic field distribution calculation result of the iron core type optical current transformer, and the magnetic field distribution intensity of the iron core type structural transformer obtained from fig. 4(2) is greater than that of the magnetic gathering ring type transformer because the iron core is made of paramagnetic material and has great magnetic conductivity, so that the magnetic induction intensity inside the iron core is greatly increased, and the magnetic field intensity of the magneto-optical glass is greatly increased.
As can be seen from fig. 3(1), fig. 3(2), fig. 4(1), and fig. 4(2), the magnetic field intensity distribution of the two structures is uniform, but the magnetic field intensity distribution of the iron core type structure is significantly stronger than that of the magnetic gathering ring type structure, and the magnetic field distribution of the transformer with the iron core type structure can reach 6 times of that of the magnetic gathering ring type transformer. This is because the iron core is a paramagnetic material and has a high magnetic permeability, so that the magnetic induction intensity inside the iron core is greatly increased, and the magnetic field intensity of the magneto-optical glass is greatly increased.
Supposing that the geometric parameters of the coil are completely the same as those of the magnetic concentration structure, the influence of the width, the radius and the length of the iron core on the distribution of the magnetic field is analyzed, the length of the magneto-optical glass is kept unchanged when the length of the iron core is changed, and the length of the magneto-optical glass is kept to be 15 mm. The length, width and radius properties of the ferrite core type sensor are shown in table 2 below.
TABLE 2 iron core sensor Length, Width and radius Property Table
Fig. 5(1) is a diagram of a magnetic field distribution calculation result of parameters of a scheme of the iron core type sensor, and it can be seen from fig. 5(1) that the magnetic field intensity of the transformer with the iron core type structure is uniform in distribution and large in intensity, so that the optimization is met.
Fig. 5(2) is a diagram of a magnetic field distribution calculation result of parameters of a core type sensor scheme, and it can be seen from fig. 5(2) that when the length of the magneto-optical glass and the radius of the core are kept unchanged, when the length of the core is increased, the magnetic field intensity is almost unchanged, and when the width of the core is increased, the magnetic field intensity is increased.
Fig. 5(3) is a diagram showing a result of calculating a magnetic field distribution of parameters of the core-type sensor scheme, and it can be seen from fig. 5(3) that when the length of the magneto-optical glass and the radius of the core are kept constant, the magnetic field intensity is reduced when the width of the core is reduced.
Fig. 5(4) is a diagram of the magnetic field distribution calculation result of the parameter of the iron core type sensor solution (r), and it can be seen from fig. 5(4) that when the length of the magneto-optical glass and the width of the iron core are kept unchanged, the magnetic field intensity is reduced when the radius of the iron core is reduced; and the influence of changing the radius of the iron core on the intensity of the magnetic field distribution is the largest, while the influence of changing the length and the width is smaller and can be basically ignored. Therefore, a larger core radius can be selected to increase the magnetic field strength of the sensor, thereby improving accuracy.
It can be seen from fig. 5(1) to 5(4) that the strength of the magnetic field is almost constant when the length of the core is increased, if the length of the magneto-optical glass is kept constant. When the radius of the iron core becomes smaller, the magnetic field strength becomes smaller. When the width of the iron core is increased, the magnetic field intensity becomes large. It can also be seen from fig. 5(1) to 5(4) that changing the radius of the core has the greatest effect on the strength of the magnetic field distribution, while changing the length and width has little, essentially negligible effect. Therefore, a larger core radius can be selected to increase the magnetic field strength of the sensor, thereby improving accuracy.
When the geometric structure of the iron core is kept unchanged, the length and the radius of the magneto-optical glass are changed, the magnetic field intensity of the optical current sensor is influenced as shown in figure 6(1) to figure 6(4),
fig. 6(1) is a graph of a calculation result of parameters of the magneto-optical glass solution 1# on the magnetic field distribution of the optical current sensor, and it can be seen from fig. 6(1) that the magnetic field intensity distribution of the magnetic core type structure transformer of the magneto-optical glass solution 1# is uniform, and the magnetic field intensity is appropriate.
Fig. 6(2) is a graph of the calculation result of the magneto-optical glass scheme 2# parameters on the magnetic field distribution of the optical current sensor, and it can be seen from fig. 6(2) that when the geometric structure of the iron core and the radius of the magneto-optical glass are kept unchanged, the length of the magneto-optical glass is changed, the magnetic field intensity is greatly changed, and when the length is reduced, the magnetic field intensity is increased.
Fig. 6(3) is a graph of the calculation result of the magneto-optical glass scheme 3# parameter on the magnetic field distribution of the optical current sensor, and it can be seen from fig. 6(3) that the length of the magneto-optical glass is changed while the geometric structure of the iron core and the radius of the magneto-optical glass are kept unchanged, the magnetic field intensity is greatly changed, and the magnetic field intensity is reduced when the length is increased. However, the length of the magneto-optical glass is affected by the number of turns of the coil and the axial pitch, the more the number of turns of the coil is, the larger the magnetic field intensity is, the larger the axial pitch is, and under the condition of the same number of turns, the length of the coil becomes larger, and the length of the corresponding magneto-optical glass also changes. Therefore, the geometric parameters of the coil need to be combined for further analysis.
Fig. 6(4) is a graph of the calculation result of the magneto-optical glass solution 4# parameter on the magnetic field distribution of the optical current sensor, and it can be seen from fig. 6(4) that when the geometric structure of the iron core and the length of the magneto-optical glass are kept unchanged, the radius of the magneto-optical glass is changed, the magnetic field intensity is also changed, and when the radius is reduced, the magnetic field is increased, but the change is small and can be ignored.
The geometrical parameters of the magneto-optical glass are shown in table 3 below.
TABLE 3 geometric parameter table of magneto-optical glass
As is clear from fig. 6(1) to 6(4), the magnetic field intensity varies greatly when the length of the magneto-optical glass is changed, and the magnetic field intensity increases as the length decreases. The magnetic field intensity will also change when the radius of the magneto-optical glass is changed, and the magnetic field will increase when the radius is reduced, but the change is small and can be ignored. The length of the magneto-optical glass is influenced by the number of turns of the coil and the axial pitch, the more the number of turns of the coil is, the larger the magnetic field intensity is, the larger the axial pitch is, and under the condition of the same number of turns, the length of the coil is increased, and the length of the corresponding magneto-optical glass is changed. Therefore, the geometric parameters of the coil need to be combined for further analysis. The coil geometry is shown in table 4 below.
TABLE 4 coil geometry parameter table
Fig. 7(1) is a diagram of a calculation result of parameters of the scheme i of the coil structure on the magnetic field distribution of the optical current sensor, and it can be obtained from fig. 7(1) that the magnetic field intensity distribution of the transformer with the iron core type structure of the parameters of the scheme i of the coil structure is uniform and the magnetic field intensity is good.
Fig. 7(2) is a graph of the calculation result of the parameters of solution ii of the coil structure on the magnetic field distribution of the optical current sensor, and it can be derived from fig. 7(2) that, when the axial pitch of the coil is kept unchanged, the number of turns of the coil is reduced by 1/2, and the magnetic field strength is 1/2, but the length of the coil is also reduced by half, if the length of the magneto-optical glass is also reduced, then the magnetic field strength is not reduced to 1/2, which provides a possibility for miniaturization of the iron core type optical current sensor.
Fig. 7(3) is a diagram of the calculation result of the parameters of the solution iii of the coil structure on the magnetic field distribution of the optical current sensor, and it can be seen from fig. 7(3) that when the axial pitch and the number of turns of the coil are changed, changing the axial pitch does not change the magnitude of the magnetic field intensity, but changes the length of the coil, so that the length of the core needs to be changed properly, and if the axial pitch is changed to 3mm, the length of the coils will be greater than the length of the core, so that the length of the core needs to be increased, but the length of the core does not necessarily affect the length of the magneto-optical glass. The optimal parameter for the coil should be the minimum axial pitch, which is related to the small radius of the coil, the smaller the radius, the smaller the length of the coil can be, but the larger the losses.
Fig. 7(4) is a graph of the calculated result of the iv parameters of the coil structure on the magnetic field distribution of the optical current sensor, and it can be derived from fig. 7(4) that the number of turns of the coil is reduced by 1/2, and the magnetic field strength is 1/2. It can be seen that the magnetic field distribution of the core-type optical current transformer is influenced by various factors, the main factors being the length of the magneto-optical glass, and the number of turns and radius of the coil. The coil structure with longer length of magneto-optical glass, smaller radius and less turns is selected, so that the magnetic field intensity of the optical current sensor can be fully improved, and the accuracy is further improved.
As can be seen from fig. 7(1) to fig. 7(4), since the number of turns is reduced by 1/2, the solution ii is 1/2 of the solution i, but the length of the coil is reduced by half, and if the length of the magneto-optical glass is also reduced, the magnetic field strength is not reduced to 1/2, which provides a possibility for miniaturization of the iron-core optical current sensor. Changing the axial pitch does not change the magnitude of the magnetic field strength but changes the length of the coils, so that the length of the core needs to be changed appropriately, and if the axial pitch is changed to 3mm, the length of those coils will be greater than the length of the core, so that the core length must be increased, but this does not necessarily affect the length of the magneto-optical glass. The optimal parameter for the coil should be the minimum axial pitch, which is related to the small radius of the coil, the smaller the radius, the smaller the length of the coil can be, but the larger the losses.
It can be seen that the magnetic field distribution of the core-type optical current transformer is influenced by various factors, the main factors being the length of the magneto-optical glass, and the number of turns and radius of the coil. The coil structure with longer length of magneto-optical glass, smaller radius and less turns is selected, so that the magnetic field intensity of the optical current sensor can be fully improved, and the accuracy is further improved.
When the method is actually used for the magnetic field intensity distribution of the optical current sensor, attention should be paid to the influence of various factors on the magnetic field intensity of the optical current sensor. The optimization method of the invention is based on the magnetic field intensity distribution rule, and further judges the appropriate parameters to optimize the accuracy of the optical current sensor by the influence of different geometric parameters on the magnetic field intensity of the sensor, so that the power system can operate safely and well.
Claims (7)
1. An optical current sensor optimization design method is characterized by comprising the following steps:
step 1: establishing a theoretical model, and analyzing the distribution uniformity of the magnetic field on the magneto-optical glass;
step 2: simulating the magnetic field distribution of optical current sensors with different structures;
and step 3: comparing the magnetic field distribution of the optical current sensor caused by the length, width and radius changes of the iron core to respectively obtain the influence relationship of the length, width and radius changes of the iron core on the magnetic field distribution;
and 4, step 4: adjusting geometric parameters of the magneto-optical glass, observing the influence on the magnetic field distribution of the optical current sensor, and obtaining the influence relation of the length and radius change of the magneto-optical glass on the magnetic field intensity;
and 5: adjusting the geometric parameters of the coil structure, observing the influence on the magnetic field distribution of the optical current sensor, and obtaining the influence relation of the radius and the number of turns of the coil on the magnetic field intensity change;
step 6: selecting proper iron core length, width and radius, determining proper parameters through mutual influence of geometric parameters of the magneto-optical glass and the coil structure, judging the moment when the magnetic field intensity of the optical current sensor is maximum, recording the iron core structure parameters, the magneto-optical glass and the coil structure at the moment, and optimally designing the optical current sensor.
2. The optical current sensor optimization design method according to claim 1, characterized in that:
in the step 1, the theoretical model is established as follows:
P1、P2the magnetic field intensity of the two points along the optical path direction is respectively H1/l、H2/lThis can be expressed as follows:
H1/l＝cosθI/2πR1
H2/l＝I/2πR2；
wherein, has R1>R2And cos θ<1, therefore H1/l<H2/lI.e. the magnetic field is not uniformly distributed along the optical path of the magneto-optical glass, the integral average value H of the magnetic field on the magneto-optical glass mediumaveCan be expressed as:
Have＝θI/2πL；
if p is1、p2The current magnitude I of the position is not changed, then p1And p2Integrated average H of magnetic field over magneto-optical glass medium in both casesaveKeeping consistent; for the concentration parameters, the fact that the uniform magnetic fields are the same means that the medium models are the same, and in both cases, the optical path output of the optical current transformer calculated through the theoretical model is also the same.
3. The optical current sensor optimization design method according to claim 1, characterized in that: in the step 2, the magnetic field distribution of the magnetic focusing ring type optical current sensor and the magnetic field distribution of the iron core type optical current sensor with two different structures are simulated through finite element analysis software, the magnetic field intensity distribution of the magnetic focusing ring type optical current sensor and the magnetic field intensity distribution of the iron core type optical current sensor are uniform, and the magnetic field distribution intensity of the iron core type optical current sensor is larger than that of the magnetic focusing ring type optical current sensor.
4. The optical current sensor optimization design method according to claim 1, characterized in that: in the step 3, the length of the magneto-optical glass is kept unchanged, and when the length of the iron core is increased, the magnetic field intensity is almost unchanged; when the radius of the iron core is reduced, the magnetic field intensity is reduced; when the width of the iron core is increased, the magnetic field intensity is increased; the influence of changing the radius of the iron core on the intensity of magnetic field distribution is the largest, and the influence of changing the length and the width is small and can be basically ignored, so that the magnetic field intensity of the sensor can be improved by selecting the larger radius of the iron core, and the accuracy is further improved.
5. The optical current sensor optimization design method according to claim 1, characterized in that: in the step 4, the geometric structure of the iron core is kept unchanged, the length of the magneto-optical glass is changed, and the magnetic field intensity is greatly changed; when the length of the magneto-optical glass is reduced, the magnetic field intensity is increased; the magnetic field intensity can also be changed by changing the radius of the magneto-optical glass, and when the radius of the magneto-optical glass is smaller, the magnetic field is larger, but the change amplitude is smaller and can be ignored.
6. The optical current sensor optimization design method according to claim 1, characterized in that: in the step 5, the length of the magneto-optical glass is influenced by the number of turns of the coil and the axial pitch, the more the number of turns of the coil is, the larger the magnetic field intensity is, the larger the axial pitch is, and under the condition of the same number of turns of the coil, the longer the coil is, and the corresponding length of the magneto-optical glass is changed; the optimal parameter for the coil is the minimum axial pitch, which is related to the coil radius, the smaller the length of the coil.
7. The optical current sensor optimization design method according to claim 1, characterized in that: in the step 6, the change of the radius of the iron core and the change of the length of the magneto-optical glass have great influence on the change of the magnetic field intensity, and the smaller the length of the magneto-optical glass is, the larger the magnetic field intensity is, thereby being beneficial to the miniaturization design; the radius of the magneto-optical glass has almost no influence on the magnetic field intensity; the coil structure with smaller radius and less turns is selected, so that the magnetic field intensity of the optical current sensor can be improved, and the accuracy is further improved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010566275.7A CN111753450B (en) | 2020-06-19 | 2020-06-19 | Optimal design method for optical current sensor |
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