CN110704962B - Manufacturing method of double-power output energy-taking magnetic core - Google Patents
Manufacturing method of double-power output energy-taking magnetic core Download PDFInfo
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- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
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- H—ELECTRICITY
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
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Abstract
The invention belongs to the field of electricity, and particularly relates to a method for manufacturing an energy-obtaining magnetic core with double power outputs. The power supply of the single energy-taking magnetic core provides two kinds of output power, the application of the energy-taking magnetic core is developed, the output power of the magnetic core is subjected to quantitative processing, the output can be directly applied to a rear-stage circuit, a power control circuit is not required to be added, the production cost is reduced, the production efficiency is improved, and the circuit space is saved.
Description
Technical Field
The invention belongs to the field of electricity, relates to a power taking technology of a power transmission line detection device, and particularly relates to a method for calculating and manufacturing an energy taking magnetic core according to actual engineering application conditions.
Background
In recent years, with the increasing scale of distribution networks, the grid structure is more and more complex, which puts higher and higher requirements on the power quality and the power supply reliability of the distribution networks. Line monitoring equipment needs to be installed on the high-voltage transmission line to ensure the normal and safe operation of the high-voltage transmission line. High-voltage side measuring equipment such as photoelectric current transformers, transmission line temperature measuring equipment and the like directly measure high-voltage side information, and then transmit acquired information to equipment installed at a grounding end through optical fibers or a wireless network, so that the requirement on insulation is simplified, and the accuracy of acquired signals is improved. However, since no suitable and ready-made power supply is available near the power transmission line tower to directly supply power to the monitoring device, the power supply problem is the key to reliable operation of the monitoring device.
At present, the main ways of supplying power to the monitoring device are solar energy-storage battery hybrid power supply, laser power supply, inductive energy-taking power supply and the like. The solar energy-storage battery power supply is mainly limited by weather, service life and operation and maintenance cost; the laser power supply is mainly influenced by power supply power, cost and service life; the induction energy taking is to convert energy on a high-voltage wire into electric energy by an electromagnetic induction mode and output the electric energy to be used as an energy taking power supply of high-voltage side measuring equipment to supply power to the high-voltage side measuring equipment. The induction energy taking mode does not have substantial contact with the high-voltage line, has an isolation effect and solves the problem of electrical insulation with the high-voltage line; the induction energy-taking equipment is small in size, easy to install, low in cost and good in application prospect, and output power is only related to the current of a high-voltage line and is not influenced by weather and environment.
The power control method of the power-taking power supply commonly used for inductive power-taking and power supply comprises the following steps: the output end of the energy taking magnetic core is connected with the bidirectional thyristor in parallel, the voltage detection module detects the output voltage of the energy taking magnetic core, when the output voltage is larger than a preset value, the trigger module triggers the bidirectional thyristor to be conducted, the secondary side of the energy taking coil is short-circuited and does not output power to the outside, and when the energy taking magnetic core outputs a zero crossing point, the thyristor is automatically turned off, and the energy taking coil automatically restores the output power to the outside. According to the method for obtaining energy and supplying power by using the induction magnetic core energy obtaining mode, output power is not subjected to quantification treatment, only the output power is adjusted to a larger point, the power is adjusted by the power control circuit, the circuit structure is complex, the fault rate is high, and the later maintenance cost is high. In different engineering application environments, the number of turns of the magnetic core is regulated and controlled by adopting a numerical algorithm, and the calculation process is complex and is not beneficial to engineering application.
Disclosure of Invention
The invention provides a simplified design algorithm and verification and calibration steps for introducing coefficients under a saturated working state according to the actual conditions of engineering application in order to solve the problems of inaccurate output power of an energy-taking magnetic core, complex parameter design of the energy-taking magnetic core and poor stability in actual use.
The technical scheme of the invention is as follows: a manufacturing method of a double-power output energy-taking magnetic core comprises the steps of parameter calculation, trial winding and turn number adjustment, wherein the parameter calculation step comprises the following steps:
A. acquiring power grid environment parameters: obtaining bus current I of power grid 1 Grid frequency f, output power P 1 Time secondary filter circuitPress U C1 Secondary circuit load R 1 Output power P 2 Time secondary filter circuit voltage U C2 Secondary circuit load R 2 In which P is 1 ＜P 2 ；
B. Preselecting various parameters of the energy-taking magnetic core: magnetic permeability mu, saturation induction density B s Lamination factor λ, inner diameter d 3 Outer diameter D 3 Height h 3 Calculating the effective cross-sectional area S 3 ＝(D 3 -d 3 )·h 3 λ, magnetic path length
Because the direction of the magnetic force line of the wound core is consistent with the rolling direction of the electrical steel sheet, the ideal magnetic performance can be achieved, and the wound core is preferably selected by the energy-obtaining magnetic ring. In the process of processing the wound iron core, the annular wound iron core does not need secondary die sinking and shaping, the processing is convenient, the cost is low, and the requirement on a winding machine in later-stage winding of the energy-taking magnetic ring is low, so that the energy-taking magnetic ring is preferably selected from the annular wound iron core. For convenience of description and calculation of various parameters of the energy-extracting magnetic core, the thickness h, the outer diameter D and the inner diameter D are defined, and a cross-sectional view thereof is shown in fig. 2. According to the diameter of the cable, the power required by the power utilization detection equipment, the space volume of a designed circuit and the reserved volume of a winding, the size limit value of the energy-taking magnetic core is comprehensively determined by combining practical experience: inner diameter d = [ d ] 1 ,d 2 ]Outer diameter D = [ D ] 1 ,D 2 ]Height h = [ h ] 1 ,h 2 ]According to the size limit of the energy-taking magnetic core, the following can be obtained: energy-taking magnetic core sectional area S = [ S ] 1 ,S 2 ]In which S is 1 ＝(D 1 -d 2 )·h 1 ，S 2 ＝(D 2 -d 1 )·h 2 (ii) a Energy-taking magnetic core magnetic circuit length l = [ l = 1 ,l 2 ]In which
From this, the inner diameter d is selected 3 Outer diameter D 3 Height h 3 And the annular wound core is within the limit value range.
C. Magnetic core for obtaining pre-selected energyMaximum output power, maximum excitation current when operating in an unsaturated state: maximum output power of magnetic core
Maximum exciting current
P max 、I m The selection basis is as follows:
when the magnetic core works in a saturation state, the current I flows along with the bus 1 Further increase, peak output with a large peak value can be generated near the zero point, subsequent circuit elements can be damaged if an electric energy control strategy is not adopted, and the complexity of the system is increased if the electric energy control strategy is adopted, so that the complexity is brought to the subsequent maintenance of the product. When the magnetic core works in a deep saturation state, the iron loss of the magnetic core is high, excessive heat is generated, and the magnetic core and the winding are easy to burn out, so that the magnetic core is prevented from working in the saturation state as much as possible. When the energy-taking magnetic core works in an unsaturated state, the magnetic core works in a linear region, the resistance impedance, the leakage inductance voltage drop, the hysteresis loss and the eddy current loss of the magnetic core are small and can be ignored in calculation, and the expression of the output power of the magnetic core is
Wherein the magnetic permeability mu of the magnetic core is equal to the vacuum permeability mu 0 And relative permeability mu of the material r Product μ = μ 0 μ r ，μ 0 ＝4π×10 -7 H/m
Obtaining the maximum output power of the magnetic core by taking the maximum value of the expression of the output power of the magnetic core
According to the ohm law of magnetic circuit, the maximum exciting current of the magnetic core just entering the saturation state
D. Adjusting various parameters of a pre-selected magnetic core: according to
Adjusting various parameters of the magnetic core: magnetic permeability of mu 1 And a saturation magnetic induction of B s1 Lamination factor of lambda 1 Inner diameter of d 4 Outer diameter of D 4 Height of h 4 The effective cross-sectional area S 4 ＝(D 4 -d 4 )·h 4 ·λ 1 Length of magnetic circuit
In order to ensure that the magnetic core works in an unsaturated state, influence caused by resistance impedance, leakage inductance voltage drop, magnetic core hysteresis loss and eddy current loss of the magnetic core is neglected in compensation calculation, and difference between compensation theoretical calculation and actual production is introduced, a design coefficient of 1.2 is introduced, so that all parameters of the magnetic core need to meet the requirement
In order to ensure that the magnetic core works in an unsaturated state, the maximum output power of the magnetic ring is required to be less than the maximum power which can be output by the magnetic ring in the unsaturated state, the bus current of the magnetic ring is less than the maximum exciting current of the magnetic ring in the unsaturated state, a design coefficient of 1.2 is introduced, the difference between theoretical calculation and actual engineering application is compensated, and the working state of the magnetic ring cannot be changed due to the theoretical calculation error. If the relation is not satisfied, the cross-sectional area S in A is determined as S = [ S = [ S ] 1 ,S 2 ]In which S is 1 ＝(D 1 -d 2 )·h 1 ，S 2 ＝(D 2 -d 1 )·h 2 Magnetic core of this wayLength l = [ l = 1 ,l 2 ]Wherein
And adjusting the parameters of the magnetic core to meet the requirement of the output power of the magnetic core. Finally determining the satisfaction
The magnetic core has the following parameters: magnetic permeability mu 1 Saturation magnetic induction B s1 Lamination factor lambda 1 Inner diameter d 4 Outer diameter D 4 Height h 4 The effective cross-sectional area S 4 ＝(D 4 -d 4 )·h 4 ·λ 1 Length of magnetic circuit
E. Calculating the output power P of the magnetic core 1 、P 2 Lower number of turns N 21 、N 22 ：
If the preselection of the energy-taking magnetic core meets the preset requirement, the parameters of the magnetic core do not need to be adjusted, and the magnetic core output power expression is carried out under the unsaturated state
Calculating the number of turns N 21 、N 22 ；
If the preselection of the energy-taking magnetic core does not meet the preset requirement, the magnetic core parameters need to be adjusted, and the magnetic core output power expression in an unsaturated state is used
Calculating the number of turns N 21 、N 22 ；
In the expression, the output power is P 1 While, U C For the voltage U of the secondary filter circuit C1 ，N 2 For taking energy, the number of secondary turns of the magnetic ring is N 21 Output power of P 2 Time U C For the secondary filter circuit voltage U C2 ，N 2 Number of secondary turns N of magnetic core for taking energy 22 。
Then theTrial winding and energy taking magnetic core: wherein the total number of turns N of the energy-taking magnetic core 22 At the number of turns N 21 And performing tapping processing. In order to conveniently correct the power value, enameled wires which can be wound by the magnetic core for more than 20 turns are required to be reserved at the tap position and the tail end of the winding.
And then adjusting the number of turns of the energy taking magnetic core: testing practical output power P of trial winding energy-taking magnetic core 1 '、P 2 ', and adjusting the number of turns N 21 、N 22 To meet power output requirements. The principle of adjusting and testing is followed in the process of adjusting the number of turns until the output power is P 1 、P 2 It is required that the number of turns at this time is N' 21 、N' 22 。
Finally, trial winding is carried out in batches to obtain the energy magnetic cores, and the output power is further verified: 10 pieces of magnetic core are wound, and the total number of turns N 'of the magnetic core is taken out' 22 N 'of number of turns' 21 And performing tapping processing. And testing the output power, and verifying the batch consistency of the output power of the energy taking magnetic cores.
The invention has the beneficial effects that: 1. according to the manufacturing method of the energy-taking magnetic core, the purpose that a single energy-taking magnetic core power supply provides two kinds of output power is achieved, the application of the energy-taking magnetic core is developed, the output power of the magnetic core is subjected to quantification processing, the output can be directly applied to a rear-stage circuit, a power control circuit is not required to be added, the production cost is reduced, the production efficiency is improved, and the circuit space is saved. Meanwhile, the stability and the reliability of the energy-taking magnetic core product are improved, the operation failure rate is reduced, the later maintenance workload of engineering personnel is reduced, and the product cost is fundamentally reduced. 2. The conventional numerical algorithm is based on theory, is relatively complex in calculation, mostly needs simulation software to calculate, and guides engineering application through a calculation result. The invention simplifies the numerical algorithm according to the practical situation of engineering application. Firstly, the working state of the magnetic core is prejudged, the maximum output power and the maximum exciting current of the magnetic core working in an unsaturated state are obtained through the step C, all the size parameters of the magnetic core are adjusted through the step D to meet the requirement that the magnetic core works in the unsaturated state, the calculation process of the unsaturated working state which is not applicable in engineering practice is omitted, the coefficient is introduced to simplify calculation, the difference of theoretical calculation and engineering application is compensated through the coefficient to influence the process quantities of resistance impedance, leakage inductance resistance voltage drop, magnetic core hysteresis loss, eddy current loss and the like of the magnetic core in a numerical algorithm, and a complete output power calculation method is formed, convenient, simple and convenient to apply.
Drawings
FIG. 1 is a schematic structural diagram of an energy-extracting magnetic core in an embodiment;
FIG. 2 is a schematic cross-sectional view of an energy-extracting core according to an embodiment;
FIG. 3 is a waveform diagram of the output power P1;
FIG. 4 is a waveform diagram of the output power P2;
in the attached drawing, 1 represents a magnetic core, 2 represents a magnetic core protection box, 3 represents a winding layer, 4 represents an aerial plug, 4-1 represents an output common end, 4-1 and 4-2 represent output lines, 4-1 and 4-2 form an output power 1 end, and 4-1 and 4-3 form an output power 2 end.
Detailed Description
The present invention will be described in detail with reference to the following examples and drawings.
A manufacturing method of a double-power-output energy-taking magnetic core specifically comprises the following steps:
A. acquiring power grid environment parameters and determining a magnetic core limit value: bus current I 1 =3A, grid frequency f =50Hz, output power P 1 Secondary filter circuit voltage U when =0.03W C1 =1.2V, output power P 2 =0.05W, secondary filter circuit voltage, U C2 ＝1.5V。
The energy-taking magnetic core is selected from an annular wound core. The size limit of the energy-taking magnetic core is as follows: inner diameter d = [0.065,0.075]m, outer diameter D = [0.08,0.09]m, height h = [0.01,0.003 =]And m is selected. The size limit of the energy-taking magnetic core can be obtained as follows: cross section of energy-taking magnetic core
Energy-taking magnetic core magnetic circuit length l = [ l = 1 ,l 2 ]＝[0.22765,0.25905]m。
B. Preselecting various parameters of the energy-taking magnetic core: the magnetic core is made of 1K107 ultra-microcrystalline material produced by Beijing Gaokoukanna manufacturers, and the performance parameters are as follows: permeability μ = μ 0 μ r ＝4π×10 -7 X 50000=0.0628H/m, saturation magnetic induction B s =0.75T, lamination factor λ =0.75.
The dimensional parameters are as follows: inner diameter d 3 =0.07m, outer diameter D 3 =0.085m, height h 3 =0.02m, then the effective cross-sectional area S 3 ＝(D 3 -d 3 )·h 3 ·λ＝2.25×10 -4 m 2 Length of magnetic circuit
C. Calculating the maximum output power and the maximum exciting current of the magnetic core with pre-selected energy taking:
maximum output power of magnetic core
Maximum exciting current
D. Adjusting various parameters of a pre-selected magnetic core: according to the relational expression of output power and maximum output power, bus current and maximum exciting current
It is known that the preselection meets predetermined requirements without the need to adjust the core parameters.
E. Calculating the output power P of the magnetic core 1 、P 2 Number of lower turns N 21 、N 22 : according to
To obtain N 21 =120 turns, N 22 =90 turns
F. Trial winding and energy taking magnetic core: wherein, the total number of turns of the energy-taking magnetic core is 120 turns, and a leading-out tap is made at the position of 90 turns. In order to conveniently correct the power value, enameled wires which can be wound by the magnetic core for more than 5 turns are required to be reserved at the tap position and the tail end of the winding.
G. And adjusting the number of turns of the energy-taking magnetic core: the actual output power P of the energy-taking magnetic core is obtained through testing 1 '＝0.0306W、P 2 ' =0.052W, slightly greater than the predetermined output power. The number of turns of the core was finely adjusted in accordance with the principle of testing while adjusting, and the following result was obtained " 21 =122 h P 1 "=0.0301W, when N" 22 =93 hr P 2 "=0.0498W satisfies the predetermined output power requirement. The energy-taking magnetic core is arranged in a fault indicator without power control, and the output waveform of the energy-taking magnetic core is shown as follows. Fig. 3 is a waveform diagram of P1, and fig. 4 is a waveform diagram of P2. As can be seen from the figure, the energy-taking magnetic core can obtain more stable output power.
H. Packaging the energy-taking magnetic core: the structure of the energy-taking magnetic core is shown in figure 1, and comprises a magnetic core 1, a protective box 2 assembled on the magnetic core 1, a winding layer 3 on the protective box 2 of the magnetic core, and an output line of a secondary winding which is connected to an aerial plug 4 and then used as an output interface of the energy-taking magnetic ring. Wherein, the 4-1 is an output common end, the 4-1 and the 4-2 ends form an output power 1 end, and the 4-1 and the 4-3 ends form an output power 2 end. Fig. 2 is a schematic cross-sectional structure diagram of an energy-extracting magnetic core.
I. Trial winding is in batches taken can the magnetic core, further verifies output: 10 coils are wound, the total number of turns of the magnetic core is taken out to be 122 turns, and a tap is led out at the position of the number of turns 93. The test output power is shown in table 1.
TABLE 1
According to the data in table 1, each parameter of 10 wound magnetic cores meets the design requirement. In this embodiment, all parameter units adopt the international unit system.
Claims (4)
1. A manufacturing method of a double-power output energy-taking magnetic core comprises the steps of parameter calculation, trial winding and turn number adjustment, and is characterized in that the parameter calculation step comprises the following steps:
A. acquiring power grid environment parameters: obtaining bus electricity of a power gridStream I 1 Grid frequency f, output power P 1 Time secondary filter circuit voltage U C1 Secondary circuit load R 1 Output power P 2 Time secondary filter circuit voltage U C2 Secondary circuit load R 2 In which P is 1 ＜P 2 ；
B. Preselecting various parameters of the energy-taking magnetic core: magnetic permeability mu, saturation induction density B s Lamination factor λ, inner diameter d 3 Outer diameter D 3 Height h 3 Calculating the effective cross-sectional area S thereof 3 ＝(D 3 -d 3 )·h 3 λ, magnetic path length
C. The maximum output power and the maximum exciting current of the preselected energy-taking magnetic core working in an unsaturated state are obtained: maximum output power of magnetic core
Maximum exciting current
D. Adjusting various parameters of a pre-selected magnetic core: according to
Adjusting various parameters of the magnetic core: magnetic permeability of mu 1 And a saturation magnetic induction of B s1 Lamination factor of lambda 1 Inner diameter of d 4 Outer diameter of D 4 Height of h 4 The effective cross-sectional area S 4 ＝(D 4 -d 4 )·h 4 ·λ 1 Length of magnetic circuit
E. Calculating the output power P of the energy-obtaining magnetic core 1 、P 2 Lower number of turns N 21 、N 22 ：
If the preselection of the energy-taking magnetic core meets the preset requirement, the parameters of the magnetic core do not need to be adjusted, and the magnetic core output power expression is carried out under the unsaturated state
Calculating the number of turns N 21 、N 22 ；
If the preselection of the energy-taking magnetic core does not meet the preset requirement, the parameters of the magnetic core need to be adjusted, and the magnetic core output power expression is carried out under the unsaturated state
Calculating the number of turns N 21 、N 22 ；
In the expression, the output power is P 1 While, U C For the secondary filter circuit voltage U C1 ，N 2 For taking out the energy, the number of secondary turns of the magnetic ring is N 21 Output power of P 2 Time U C For the voltage U of the secondary filter circuit C2 ，N 2 For taking out the number of secondary turns N of the magnetic core 22 。
2. The method for manufacturing a dual power output energy-taking magnetic core according to claim 1, wherein: the energy-taking magnetic core is an iron core.
3. The method of manufacturing a dual power output energy core according to claim 2, wherein: the iron core is an annular wound iron core.
4. The method of manufacturing a dual power output energy core according to claim 3, wherein: the annular wound iron core is made of iron-based ultra-microcrystalline alloy.
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