阅读说明：本技术 并联电抗器 (Parallel reactor ) 是由 张凡 汲胜昌 张玉焜 于 2021-01-27 设计创作，主要内容包括：本申请涉及一种并联电抗器,所述并联电抗器包括：中心部件和外围部件,所述中心部件的第一端与所述外围部件连接,所述中心部件的第二端与所述外围部件连接,所述中心部件用于补偿所述并联电抗器所属电路的容性无功功率,所述外围部件用于支撑所述中心部件,其中：所述中心部件的第一端与所述中心部件的第二端的磁导率均为预设数值,且所述中心部件的磁导率沿预设方向连续变化,所述预设方向为所述第一端指向所述第二端的方向。使用该并联电抗器可以减小并联电抗器运行过程中产生的振动,从而避免的运行噪声的产生,保证电网的安全运行。(The application relates to a shunt reactor, the shunt reactor includes: a central member and a peripheral member, a first end of the central member being connected to the peripheral member and a second end of the central member being connected to the peripheral member, the central member being configured to compensate for capacitive reactive power of a circuit to which the shunt reactor belongs, the peripheral member being configured to support the central member, wherein: the magnetic permeability of the first end of the central component and the magnetic permeability of the second end of the central component are both preset values, the magnetic permeability of the central component continuously changes along a preset direction, and the preset direction is a direction in which the first end points to the second end. The parallel reactor can reduce the vibration generated in the running process of the parallel reactor, thereby avoiding the generation of running noise and ensuring the safe running of a power grid.)

1. A shunt reactor, characterized in that the shunt reactor comprises: a central member and a peripheral member, a first end of the central member being connected to the peripheral member and a second end of the central member being connected to the peripheral member, the central member being configured to compensate for capacitive reactive power of a circuit to which the shunt reactor belongs, the peripheral member being configured to support the central member, wherein:

the magnetic permeability of the central component and the length of the central component along a preset direction meet a continuous function relationship, and the preset direction is a direction in which the first end points to the second end.

2. The shunt reactor according to claim 1, characterized in that magnetic permeability of the first end of the central member and the second end of the central member are each a predetermined value.

3. The shunt reactor according to claim 2, characterized in that the preset value is a magnetic permeability of the peripheral component.

4. The shunt reactor according to claim 1, characterized in that the center member includes a winding and a reluctance member, the winding being wound outside the reluctance member.

5. The shunt reactor according to claim 4, characterized in that the magnetoresistive element includes one or more first sub-magnetoresistive elements and one or more second sub-magnetoresistive elements; the magnetic permeability of the first sub-magnetoresistive component and the length of the first sub-magnetoresistive component along a preset direction satisfy a first continuous function for characterizing that the magnetic permeability of the first sub-magnetoresistive component decreases continuously from the preset value along the preset direction;

the magnetic permeability of the second sub-magnetoresistive component and the length of the second sub-magnetoresistive component along the preset direction satisfy a second continuous function, and the second continuous function is used for representing that the magnetic permeability of the second sub-magnetoresistive component continuously increases to a preset value along the preset direction.

6. The shunt reactor according to claim 5, characterized in that the magnetic resistance of the magnetic resistance element is determined by the magnetic resistance of the one or more first sub-magnetic resistance elements and the magnetic resistance of the one or more second sub-magnetic resistance elements.

7. The shunt reactor of claim 6, characterized in that the reluctance of said first sub-reluctance element is determined by the average magnetic permeability of said first sub-reluctance element, the length of said first sub-reluctance element, and the cross-sectional area of said first sub-reluctance element;

the magnetic resistance of the second sub-magnetoresistive element is determined by an average magnetic permeability of the second sub-magnetoresistive element, a length of the second sub-magnetoresistive element, and a cross-sectional area of the second sub-magnetoresistive element.

8. The shunt reactor according to claim 7, characterized in that the magnetic resistance of the magnetic resistance element is calculated by the following formula:

wherein R is the reluctance of the reluctance element, μ₁Is the average permeability, h, of said first sub-magneto-resistive element₁Is the length of the first sub-magnetoresistive element, mu₂Is the average permeability, h, of said second sub-magneto-resistive element₂Is a length of the first sub magnetoresistive element and S is a cross-sectional area of the first sub magnetoresistive element and the second sub magnetoresistive element.

9. The shunt reactor according to claim 4, characterized in that the magneto-resistive element further comprises one or more third sub-magneto-resistive elements, the magnetic permeability of which is a stable value smaller than the preset value.

10. The shunt reactor according to claim 9, characterized in that the magnetic resistance of the magnetic resistance element is determined in accordance with the magnetic resistance of the one or more first sub-magnetic resistance elements, the magnetic resistance of the one or more second sub-magnetic resistance elements, and the magnetic resistance of the one or more third sub-magnetic resistance elements.

Technical Field

The application relates to the technical field of power systems, in particular to a shunt reactor.

Background

The shunt reactor is used as an important component of reliable operation of a power grid, can effectively compensate capacitive reactive power of an extra (ultra) high-voltage transmission line, reduces power loss on the line, improves voltage distribution, and is key equipment of a long-distance power transmission system.

In the prior art, an iron core of a shunt reactor is generally in a structure with gaps formed by stacking cold-rolled silicon steel sheets, and the silicon steel sheets are separated by a non-magnetic insulating plate to form the gaps.

However, in the normal operation process of the parallel reactor, relatively violent vibration is generated due to the electromagnetic effect, so that inevitable operation noise is generated, and the safe operation of a power grid is seriously damaged.

Disclosure of Invention

In view of the above, it is necessary to provide a parallel reactor capable of reducing severe vibration generated during operation of the parallel reactor, in view of the above technical problems.

There is provided a shunt reactor including: the first end of central component and peripheral component, central component's second end and peripheral component are connected, and central component is used for compensating the capacitive reactive power of the affiliated circuit of shunt reactor, and the peripheral component is used for supporting central component, wherein: the magnetic permeability of the central component and the length of the central component along a preset direction meet a continuous function relationship, and the preset direction is a direction in which the first end points to the second end.

In one embodiment, the magnetic permeability of the first end of the central member and the second end of the central member are both a predetermined value.

In one embodiment, the predetermined value is a magnetic permeability of the peripheral component.

In one embodiment, the method further comprises the following steps: the central member includes a winding and a magneto resistive member, the winding being wound outside the magneto resistive member.

In one embodiment, the magnetoresistive elements include one or more first sub-magnetoresistive elements and one or more second sub-magnetoresistive elements; the magnetic permeability of the first sub-magnetoresistive component and the length of the first sub-magnetoresistive component along a preset direction satisfy a first continuous function for characterizing that the magnetic permeability of the first sub-magnetoresistive component decreases continuously from the preset value along the preset direction;

the magnetic permeability of the second sub-magnetoresistive component and the length of the second sub-magnetoresistive component along the preset direction satisfy a second continuous function, and the second continuous function is used for representing that the magnetic permeability of the second sub-magnetoresistive component continuously increases to a preset value along the preset direction.

In one embodiment, the magnetic resistance of the magnetoresistive elements is determined by the magnetic resistance of one or more first sub-magnetoresistive elements and the magnetic resistance of one or more second sub-magnetoresistive elements.

In one embodiment, the magnetic resistance of the first sub-magnetoresistive element is determined by an average magnetic permeability of the first sub-magnetoresistive element, a length of the first sub-magnetoresistive element, and a cross-sectional area of the first sub-magnetoresistive element; the magnetic resistance of the second sub-magnetoresistive element is determined by the average magnetic permeability of the second sub-magnetoresistive element, the length of the second sub-magnetoresistive element, and the cross-sectional area of the second sub-magnetoresistive element.

In one embodiment, the reluctance of the reluctance component is calculated by the following equation:

wherein R is the reluctance of the reluctance element, μ₁Is the average permeability, h, of the first sub-magnetoresistive element₁Is the length of the first sub-magneto-resistive element, mu₂Is the average permeability, h, of the second sub-magneto-resistive element₂Is the length of the first sub-magneto resistive element and S is the cross sectional area of the first sub-magneto resistive element and the second sub-magneto resistive element.

In one embodiment, the magneto-resistive element further comprises one or more third sub-magneto-resistive elements having a permeability of a plateau value smaller than the preset value.

In one embodiment, the magnetic resistances of the magnetoresistive elements are determined based on the magnetic resistances of one or more first sub-magnetoresistive elements, the magnetic resistances of one or more second sub-magnetoresistive elements, and the magnetic resistances of one or more third sub-magnetoresistive elements.

The above provides a shunt reactor, which includes: the first end of central component and peripheral component, central component's second end and peripheral component are connected, and central component is used for compensating the capacitive reactive power of the affiliated circuit of shunt reactor, and the peripheral component is used for supporting central component, wherein: the magnetic permeability of the central component and the length of the central component along a preset direction satisfy a continuous function relation, and the preset direction is a direction in which the first end points to the second end. The parallel reactor comprises the central component and the peripheral component, so that the normal operation of the parallel reactor can be ensured, and the phenomenon of toppling can not occur. In addition, the magnetic permeability of the central component continuously changes along the preset direction, the preset direction is the direction from the first end to the second end, the magnetic permeability of the central component can be continuously changed, and discrete discontinuity is avoided. As the magnetic permeability of the central part is continuously changed, Maxwell electromagnetic force is not generated, and the vibration generated in the running process of the shunt reactor is reduced, so that the running noise is avoided, and the safe running of the power grid is ensured.

Drawings

FIG. 1 is a schematic diagram of a conventional shunt reactor in one embodiment;

FIG. 2 is a schematic diagram of a shunt reactor in one embodiment;

FIG. 3 is a schematic illustration of a continuous function in one embodiment;

FIG. 4 is a schematic diagram showing a structure of a shunt reactor in another embodiment;

FIG. 5 is a schematic diagram showing a structure of a shunt reactor in one embodiment;

FIG. 6 is a schematic diagram showing a configuration of a shunt reactor in one embodiment;

FIG. 7 is a schematic diagram showing a configuration of a shunt reactor in one embodiment;

FIG. 8 is a diagram illustrating a shunt reactor and its permeability and length as a continuous function in one embodiment;

FIG. 9 is a diagram of a shunt reactor and its permeability and length as a continuous function in one embodiment;

fig. 10 is a schematic sectional view of the structure of a shunt reactor in one embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In the embodiments of the present application, shunt reactors are typically connected between the ends of the extra high voltage transmission line and ground for compensating capacitive reactive power in the circuit. The reactive compensation principle of the parallel reactor is to counteract capacitive reactive current of a capacitor in a circuit by using inductive reactive current of the reactor, so that normal operation of a circuit is ensured. Most of the electric loads in the power grid, such as motors, transformers and the like, belong to inductive loads, and the inductive loads need to ask for lag reactive power from a power supply to realize energy conversion in actual operation so as to drive equipment to do work. In order to compensate for this consumption of hysteresis, a common method is a parallel capacitor compensation. After reactive compensation equipment such as a shunt reactor and the like is installed in the power grid, reactive power consumed by inductive load can be provided, and reactive load of the power supply of the power grid is reduced. Because the flow of reactive power in the power grid is reduced, the electric energy loss of lines and transformers caused by the transmission of reactive power can be reduced.

After the shunt reactor is connected in parallel to the circuit, the central part in the shunt reactor can generate inductive reactive current, thereby counteracting capacitive reactive current of a capacitor in the circuit and ensuring normal operation of the circuit. Because the capacitive reactive power generated by the high-voltage line and the extra-high voltage line is relatively large, the parallel reactor required to be connected in parallel is also large. Because only the central component of the shunt reactor can not be connected in parallel to the circuit, peripheral components for supporting the central component of the shunt reactor are also needed, and the central component in the shunt reactor can work normally. In general, the iron core of the shunt reactor is generally structured by stacking cold rolled silicon steel sheets with gaps, and the silicon steel sheets are separated by nonmagnetic insulating plates to form the gaps. Wherein the non-magnetic insulating plates may be a plurality of marble cylinders, as shown in fig. 1. Because the magnetic resistance of the air gap is much larger than that of the iron core, when magnetic lines of force enter the air gap through the silicon steel sheet, obvious magnetic leakage phenomenon exists at the edge of the air gap, vibration and noise are generated among iron core cakes due to electromagnetic force in an alternating magnetic field, and nonlinear vibration caused by magnetostriction exists in the iron core, so that the problems of mechanical vibration and noise of the iron core are more serious than that of a transformer. After the high-voltage parallel reactor is put into operation, the high-voltage parallel reactor runs at full load, continuous mechanical vibration easily causes loosening of components such as coils, iron cores (clamping pieces), bolt fasteners and the like, further aggravates the occurrence of vibration, and can cause defects such as overheating and discharging in equipment in serious conditions, so that the high-voltage parallel reactor is one of important failure reasons of the reactor.

The embodiment of the application provides a shunt reactor, and when a central component of the shunt reactor is connected into a circuit, the vibration caused by electromagnetic force can be effectively reduced, and the normal operation of the shunt reactor is ensured.

As shown in fig. 2, a shunt reactor 20 according to an embodiment of the present application includes: a central member 21 and a peripheral member 22, a first end 211 of the central member 21 being connected to the peripheral member 22, a second end 212 of the central member being connected to the peripheral member 22, the central member 11 being adapted to compensate for capacitive reactive power of a circuit to which the shunt reactor belongs, the peripheral member 22 being adapted to support the central member 21, wherein:

the magnetic permeability of the central component and the length of the central component along a preset direction meet a continuous function relationship, and the preset direction is a direction in which the first end points to the second end.

In the embodiment of the present application, the continuous functional relationship that the magnetic permeability of the central component and the length of the central component along the preset direction satisfy may be any function such as a linear function, a quadratic function, a cubic function, and the like.

As shown in fig. 3, fig. 3(a) shows only the case where the continuous function is a quadratic function, and fig. 3(b) shows the case where the continuous function is a cubic function.

In the embodiment of the present application, the electromagnetic force generated in the alternating magnetic field is mainly maxwell electromagnetic force, and maxwell electromagnetic force is mainly longitudinal force generated in the direction of the magnetic force lines perpendicular to the surface of the magnet, and for the area element acting on the surface of the magnet, the force and the magnetic induction intensity received by the area element are related to the included angle between the magnetic force lines and the surface. The internal structure and magnetic field distribution of the shunt reactor are shown in fig. 4. Integrating the area elements along the surfaces of the iron core column and the nonmagnetic material to obtain the electromagnetic force on the interface as follows:

in equation (1): f is electromagnetic force; b is magnetic density; phi is magnetic flux; s is the sectional area; mu.s₀Is the magnetic permeability and n is the normal vector.

The electromagnetic force acts on the iron core cake through the air gap, the relative permeability of the air gap is different from that of the iron core cake greatly, so that the magnetic force line on the surface of the iron core cake is perpendicular to the surface of the iron core cake, namely the direction of main magnetic flux, because the magnetic flux acts on the air gap and expands along the diameter direction of the silicon steel sheet, if the nonmagnetic insulating plate adopts a plurality of marble cylinders, the periodically-changed electromagnetic force exists at each joint of the silicon steel sheet and the marble, and the extruded marble finally causes the vibration of equipment. Wherein, the magnetic permeability of silicon steel sheet is very big, about 7000 times of marble and air magnetic permeability.

Formula (1) can be simplified as:

where σ is Maxwell stress, B_zThe peak value of the normal magnetic induction intensity between the marble and the iron core column; mu.s₀The magnetic permeability of air or oil, and A is the overlapping area between adjacent silicon steel sheets.

As can be seen from the above, since the magnetic permeability of the silicon steel sheet is much different from that of the marble, maxwell electromagnetic force is generated, and relatively severe vibration is generated, thereby generating inevitable operation noise.

In order to solve the above problems, in the embodiment of the present application, the magnetic permeability of the central part 21 of the parallel point reactor 20 is continuously changed, so that the difference between the magnetic permeability of two adjacent points of the central part is small, maxwell electromagnetic force cannot be generated, the generated vibration is reduced, and the trip operation of the parallel reactor is ensured. Exemplarily, the difference in permeability between two points a and b in fig. 3(a) is Δ μ,. Δ μ is very small, so that maxwell electromagnetic force cannot be generated.

In an embodiment of the present application, there is provided a shunt reactor including: the first end of central component and peripheral component, central component's second end and peripheral component are connected, and central component is used for compensating the capacitive reactive power of the affiliated circuit of shunt reactor, and the peripheral component is used for supporting central component, wherein: the magnetic permeability of the first end of the central component and the magnetic permeability of the second end of the central component are both preset values, the magnetic permeability of the central component continuously changes along a preset direction, and the preset direction is a direction in which the first end points to the second end. The parallel reactor comprises the central component and the peripheral component, so that the normal operation of the parallel reactor can be ensured, and the phenomenon of toppling can not occur. In addition, the magnetic permeability of the first end of the central component and the second end of the central component are both preset values, so that better connection between the central component and the peripheral component can be ensured. In addition, the magnetic permeability of the central component continuously changes along the preset direction, the preset direction is the direction from the first end to the second end, the magnetic permeability of the central component can be continuously changed, and discrete discontinuity is avoided. As the magnetic permeability of the central part is continuously changed, Maxwell electromagnetic force is not generated, and the vibration generated in the running process of the shunt reactor is reduced, so that the running noise is avoided, and the safe running of the power grid is ensured.

In an alternative implementation of the present application, in order to better balance the magnetic permeability of the first end of the central member with the second magnetic permeability, the magnetic permeability of the first end of the central member and the magnetic permeability of the second end of the central member may be both preset values.

In the embodiment of the present application, the magnetic permeability of the first end of the central member and the second end of the central member may be a predetermined value. The preset value can be any value which meets the actual production application condition. Optionally, the preset value may be 7000H/m, 8000H/m, or 10000H/m, and the preset data is not specifically limited in this embodiment of the application.

In the embodiment of the application, the magnetic conductivities of the first end of the central component and the second end of the central component are preset values, so that the better balance between the magnetic conductivities of the first end and the second end of the central component can be ensured, the generated electromagnetism is more balanced, and the vibration generated in the running process of the shunt reactor is effectively reduced.

In an alternative implementation of the present application, the predetermined value of the magnetic permeability as the first end 211 and the second end 212 of the central member 21 may be the magnetic permeability of the peripheral member 22.

In the embodiment of the present application, in order to ensure that the magnetic permeability of the connection end of the first end 211 of the central member and the peripheral member 22 is not interrupted, and the magnetic permeability of the connection end of the second end 212 of the central member and the peripheral member 22 is not interrupted. The magnetic permeability of the first end 211 of the central member and the second end 212 of the central member may be both set to a predetermined value, which is the magnetic permeability of the peripheral member 22. Thus, it is achieved that the magnetic permeability of both the first end of the central member and the second end of the central member is the same as the magnetic permeability of the peripheral member.

Illustratively, when the magnetic permeability of the peripheral component is 7000H/m, the predetermined value is 7000H/m, and the magnetic permeability of the first end of the central component and the second end of the central component is 7000H/m.

In the embodiment of the present application, the preset value is the magnetic permeability of the peripheral component. It is ensured that the magnetic permeability of both the first end of the central member and the second end of the central member is the same as the magnetic permeability of the peripheral member. So that the magnetic permeability of the connection part of the first end of the central component and the peripheral component is continuous and uninterrupted, and the magnetic permeability of the connection part of the second end of the central component and the peripheral component is continuous and uninterrupted. Therefore, the electromagnetic force is not generated at the joint of the first end of the central component and the peripheral component and the joint of the second end of the central component and the peripheral component, so that vibration is not generated, and the normal operation of the shunt reactor is ensured.

In an alternative implementation of the present application, as shown in fig. 5, the central member 21 comprises a winding 213 and a magneto resistive member 214, the winding 213 being wound outside the magneto resistive member 214.

In the present embodiment, the center part 21 of the shunt reactor 20 includes the winding 213 and the magnetic resistance part 214, wherein the winding 213 may be an energizing wire, and the magnetic resistance part 214 may be a non-insulated metal part. Alternatively, winding 213 may be a copper wire or an aluminum wire. The magneto-resistive element 214 may be a non-insulated metal element based on manganese-zinc ferrite powder.

In the present embodiment, the winding 213 is wound on the outer side of the magnetic resistance member 214, and the number of turns of the winding 213 wound on the outer periphery of the magnetic resistance member 214 is determined by the radius of the cross section of the magnetic resistance member and the length of the winding. The radius of the cross section of the magnetic resistance element 214 and the length of the winding 213 may be determined according to actual conditions, and the radius of the cross section of the magnetic resistance element 214 and the length of the winding 213 are not specifically limited in the embodiments of the present application.

In an embodiment of the application, the central part comprises a winding and a magneto resistive part, the winding being wound outside the magneto resistive part. The generated magnetic field is not strong because the inductance generated by the winding itself is small. When the winding is wound on the periphery of the magnetic resistance component, the inductance generated by the winding can be increased, so that the generated magnetic field is stronger, and the shunt reactor can better compensate the capacitive reactive power in the circuit.

In an alternative implementation of the present application, as shown in fig. 6, the magnetoresistive component 214 may include one or more first sub-magnetoresistive components 2141 and one or more second sub-magnetoresistive components 2142. Only two first sub-magnetoresistive elements and two second sub-magnetoresistive elements are shown in fig. 6, but the number of first sub-magnetoresistive elements and two second sub-magnetoresistive elements is not limited. The magnetic permeability of the first sub-magnetoresistive component and the length of the first sub-magnetoresistive component along a preset direction satisfy a first continuous function for characterizing that the magnetic permeability of the first sub-magnetoresistive component decreases continuously from the preset value along the preset direction; the magnetic permeability of the second sub-magnetoresistive component and the length of the second sub-magnetoresistive component along the preset direction satisfy a second continuous function, and the second continuous function is used for representing that the magnetic permeability of the second sub-magnetoresistive component continuously increases to a preset value along the preset direction.

In the present embodiment, the magnetoresistive element 214 may include one or more first sub magnetoresistive elements 2141 and one or more second sub magnetoresistive elements 2142. Here, the number of the first sub magnetoresistive parts 2141 and the second sub magnetoresistive parts 2142 may be the same or different. Alternatively, the number of the first sub magnetoresistive elements 2141 may be 1, 2, 3, and the like, and the number of the second sub magnetoresistive elements 1142 may be 1, 2, 3, and the like.

In the present embodiment, the permeability of the first sub magnetoresistive element 2141 decreases continuously in the preset direction from a preset value. Optionally, the magnetic permeability of the first sub-magnetoresistive component and the length of the first sub-magnetoresistive component along the preset direction satisfy a first continuous function, where the first continuous function is used to represent that the magnetic permeability of the first sub-magnetoresistive component decreases continuously from the preset value along the preset direction, and optionally, the first continuous function may be a linear function, a quadratic function, or a cubic function, and this embodiment of the present application does not specifically limit any function.

Optionally, when the first sub-magnetoresistive element 2141 has two segments, the magnetic permeability of the first sub-magnetoresistive element decreases continuously from the preset value to the second preset magnetic permeability value along the preset direction, and the magnetic permeability of the second sub-magnetoresistive element decreases continuously from the second preset magnetic permeability value to the third preset magnetic permeability value along the preset direction.

Illustratively, when there are two first sub-magnetoresistive elements 2141 and the predetermined value is 7000H/m, the second predetermined value is 5000H/m, and the third predetermined value is 3000H/m. The permeability of the first sub magnetoresistive element decreases continuously from 7000H/m in the predetermined direction to 5000H/m, and the permeability of the second first sub magnetoresistive element decreases continuously from 5000H/m in the predetermined direction to 3000H/m.

In an embodiment of the present application, the magnetic permeability of the second sub-magnetoresistive component and the length of the second sub-magnetoresistive component along the predetermined direction satisfy a second continuous function for characterizing that the magnetic permeability of the second sub-magnetoresistive component increases continuously along the predetermined direction to a predetermined value. Optionally, the second continuous function may be a linear function, a quadratic function, or a cubic function, and any function is not specifically limited in this embodiment of the application.

It should be noted that a first continuous function that the magnetic permeability of the first sub-magnetoresistive element and the length of the first sub-magnetoresistive element in the predetermined direction satisfy may be the same as or different from a second continuous function that the magnetic permeability of the second sub-magnetoresistive element and the length of the second sub-magnetoresistive element in the predetermined direction satisfy.

Alternatively, in the case where the magnetoresistive element 214 includes the first sub-magnetoresistive element 2141 and the second sub-magnetoresistive element 2142, the first sub-magnetoresistive element is continuously decreased from the preset value to the second preset magnetic permeability value in the preset direction, and the second sub-magnetoresistive element is continuously increased from the second preset magnetic permeability value to the preset value in the preset direction.

Illustratively, in the case of the magneto-resistive elements up to and including the first sub-magneto-resistive element and the second sub-magneto-resistive element, the predetermined value is 7000H/m and the second predetermined value is 5000H/m. The permeability of the first sub magnetoresistive component decreases continuously from 7000H/m in the preset direction to 5000H/m. The permeability of the second sub magneto-resistive element increases continuously from 5000H/m to 7000H/m in the preset direction.

In an embodiment of the present application, a magnetoresistive element includes one or more first sub-magnetoresistive elements and one or more second sub-magnetoresistive elements; the permeability of the first sub-magnetoresistive component decreases continuously from a preset value in a preset direction, and the permeability of the second sub-magnetoresistive component increases continuously in the preset direction to a preset value. The magnetic resistance component not only ensures the continuity of the magnetic conductivity, but also ensures that the magnetic resistance obtained by the magnetic resistance component based on the calculation of the magnetic conductivity meets the requirement of the shunt reactor, so that the shunt reactor does not generate electromagnetic force in the normal operation process, vibration is not generated, and the requirement of the circuit to which the shunt reactor belongs on the magnetic resistance of the shunt reactor is met.

In an alternative embodiment of the present application, the magnetic resistance of the magnetic resistance element 214 is determined by the magnetic resistance of one or more first sub magnetic resistance elements 2141 and the magnetic resistance of one or more second sub magnetic resistance elements 2142.

In the embodiment of the present application, the magnetic resistances of the required magnetoresistive elements are different depending on the parallel connection of the parallel reactors, and the magnetic resistance of the magnetoresistive elements is determined by the magnetic resistance of each of the first sub-magnetoresistive elements and the magnetic resistance of each of the second sub-magnetoresistive elements constituting the magnetoresistive elements.

In an alternative implementation of the present application, the magnetic resistance of first sub-magnetoresistive element 2141 is determined by the average magnetic permeability of first sub-magnetoresistive element 2141, the length of first sub-magnetoresistive element 1141, and the cross-sectional area of first sub-magnetoresistive element 2141.

Alternatively, the magnetic resistance of the first sub-magnetoresistive element may be equal to a quotient of the average magnetic permeability of the first sub-magnetoresistive element multiplied by the length of the first sub-magnetoresistive element divided by the cross-sectional area of the first sub-magnetoresistive element.

Alternatively, the magnetic resistance of the first sub-magnetic resistance element may be equal to the average magnetic permeability of the first sub-magnetic resistance element multiplied by the length of the first sub-magnetic resistance element divided by the cross-sectional area of the first sub-magnetic resistance element multiplied by a predetermined coefficient. In this embodiment of the present application, the preset coefficient may be 1 or 1.2, and the preset coefficient is not specifically limited in this embodiment of the present application.

In an alternative implementation of the present application, the magnetic resistance of the second sub-magnetoresistive part 2142 is determined by the average magnetic permeability of the second sub-magnetoresistive part 2142, the length of the second sub-magnetoresistive part 2142, and the cross-sectional area of the second sub-magnetoresistive part.

Alternatively, the magnetic resistance of the second sub-magnetoresistive element may be equal to a quotient of the average magnetic permeability of the second sub-magnetoresistive element multiplied by the length of the second sub-magnetoresistive element divided by the cross-sectional area of the second sub-magnetoresistive element.

Alternatively, the magnetic resistance of the second sub-magnetoresistive element may be equal to a quotient of the average magnetic permeability of the second sub-magnetoresistive element multiplied by the length of the second sub-magnetoresistive element divided by the cross-sectional area of the second sub-magnetoresistive element multiplied by a predetermined coefficient. In this embodiment of the present application, the preset coefficient may be 1 or 1.2, and the preset coefficient is not specifically limited in this embodiment of the present application.

In an alternative implementation of the present application, the reluctance of the reluctance component is calculated by the following formula:

wherein R is the reluctance of the reluctance element, μ₁Is the average permeability, h, of the first sub-magnetoresistive element₁Is the length of the first sub-magneto-resistive element, mu₂Is the average permeability, h, of the second sub-magneto-resistive element₂Is the length of the first sub-magneto resistive element and S is the cross sectional area of the first sub-magneto resistive element and the second sub-magneto resistive element.

In an embodiment of the present application, the magnetic resistance of the first sub-magnetic resistance element is determined based on the average magnetic permeability of the first sub-magnetic resistance element, the length of the first sub-magnetic resistance element, and the cross-sectional area of the first sub-magnetic resistance element. The magnetic resistance of the second sub-magnetoresistive component is determined based on the average magnetic permeability of the second sub-magnetoresistive component, the length of the second sub-magnetoresistive component, and the cross-sectional area of the second sub-magnetoresistive component. The magnetic resistance of the magnetoresistive elements is determined on the basis of the magnetic resistance of one or more first sub-magnetoresistive elements and the magnetic resistance of one or more second sub-magnetoresistive elements. The magnetic resistance of the magnetic resistance component can be calculated quickly, so that whether the magnetic resistance of the current shunt reactor meets the requirements of the circuit can be determined quickly. By the formulaThe accurate magnetic resistance of the magnetic resistance component is obtained through calculation, and whether the magnetic resistance of the current shunt reactor meets the requirements of the circuit or not can be determined more accurately, so that the shunt reactor is guaranteed to run better, and the capacitive reactive power in the circuit is compensated.

In an alternative embodiment of the present application, as shown in fig. 7, the magneto-resistive elements further include one or more third sub magneto-resistive elements 2143, and the permeability of the third sub-magneto-resistive elements 2143 is a stable value smaller than a preset value.

In the present embodiment, the magnetoresistive element may include one or more third sub-magnetoresistive elements in addition to the one or more first sub-magnetoresistive elements and the one or more second sub-magnetoresistive elements described above. The number of the third sub-magnetoresistive elements may be the same as or different from the number of the first sub-magnetoresistive elements and the number of the second sub-magnetoresistive elements. In the embodiment of the present application, the number of the third sub magnetoresistive elements is not particularly limited. Alternatively, the third sub magnetoresistive element may connect the first sub magnetoresistive element and the second sub magnetoresistive element.

Alternatively, the magnetoresistive elements may include a first sub-magnetoresistive element, a second sub-magnetoresistive element, and a third sub-magnetoresistive element. The magnetic permeability of the first sub-magnetic resistance component is continuously reduced to a stable value smaller than a preset value from the preset value along a preset direction, one end of the third sub-magnetic resistance component is connected with the first sub-magnetic resistance component, and the magnetic permeability of the third sub-magnetic resistance component is the stable value smaller than the preset value. The other end of the third sub-magnetoresistive element is connected to the first sub-magnetoresistive element, and the magnetic permeability of the second sub-magnetoresistive element is continuously increased from a stable value smaller than a preset value to the preset value along a preset direction. As shown in fig. 8, it shows the relationship of the magnetic permeability of the magnetoresistive element to the length of the magnetoresistive element in the case where the magnetic permeability of the first sub-magnetoresistive element and the length in the preset direction satisfy a linear function, the magnetic permeability of the second sub-magnetoresistive element and the length in the preset direction also satisfy a linear function, and the magnetic permeability of the third sub-magnetoresistive element 1143 is a stable value smaller than a preset value.

As shown in fig. 9, it shows the relationship of the magnetic permeability of the magnetoresistive element to the length of the magnetoresistive element in the case where the magnetic permeability of the first sub-magnetoresistive element and the length in the preset direction satisfy a cubic function, the magnetic permeability of the second sub-magnetoresistive element and the length in the preset direction also satisfy a cubic function, and the magnetic permeability of the third sub-magnetoresistive element 2143 is a stable value smaller than a preset value.

Illustratively, the predetermined value is 7000H/m, and the stable value less than the predetermined value is 3000H/m. The magneto-resistive elements may comprise a first sub-magneto-resistive element, a second sub-magneto-resistive element and a third sub-magneto-resistive element. The magnetic permeability of the first sub-magnetic resistance component is continuously reduced to 3000H/m from 7000H/m along the preset direction, one end of the third sub-magnetic resistance component is connected with the first sub-magnetic resistance component, and the magnetic permeability of the third sub-magnetic resistance component is 3000H/m. The other end of the third sub-magneto resistive element is connected to the first sub-magneto resistive element, and the magnetic permeability of the second sub-magneto resistive element is continuously increased from 3000H/m to 7000H/m along the preset direction.

In an embodiment of the application, the magneto-resistive elements further comprise one or more third sub-magneto-resistive elements having a permeability of a plateau value smaller than the preset value. The third sub magnetoresistive element has a stable magnetic permeability smaller than a predetermined value, and thus the third sub magnetoresistive element is easy to process, thereby accelerating the processing speed and saving time.

In an alternative implementation of the present application, the magnetic resistances of the magnetoresistive elements are determined based on the magnetic resistances of one or more first sub-magnetoresistive elements, the magnetic resistances of one or more second sub-magnetoresistive elements and the magnetic resistances of one or more third sub-magnetoresistive elements.

The way in which the magnetic resistance of the first sub-magnetoresistive element and the magnetic resistance of the second sub-magnetoresistive element are calculated is known from the above. In the embodiment of the present application, the magnetic resistance of the third sub-magnetoresistive element may alternatively be equal to a quotient of the magnetic permeability of the third sub-magnetoresistive element multiplied by the length of the third sub-magnetoresistive element divided by the cross-sectional area of the third sub-magnetoresistive element.

In an embodiment of the application, the magnetic resistances of the magnetoresistive elements are determined on the basis of the magnetic resistances of one or more first sub-magnetoresistive elements, the magnetic resistances of one or more second sub-magnetoresistive elements and the magnetic resistances of one or more third sub-magnetoresistive elements. Whether the magnetic resistance of the current shunt reactor meets the requirements of the circuit or not can be determined, so that the shunt reactor can be guaranteed to run better, and the capacitive reactive power in the circuit can be compensated.

In an embodiment of the present application, as shown in fig. 10, there is provided a shunt reactor including: a central component and a peripheral component. Wherein the central part may comprise a winding 5 and a magneto resistive element 7, the magneto resistive element 7 comprising: a first sub-magneto resistive element 8, a second sub-magneto resistive element 10 and a third sub-magneto resistive element 9. The peripheral member includes: an iron yoke 1 and a box wall magnetic shield 3. Further, the shunt reactor may further include a top magnetic shield 2, a bottom magnetic shield 4, and a magnetic path 6.

In an alternative embodiment of the present application, an alternative method of fabricating a magnetoresistive component is provided, which may include:

manganese-zinc ferrite powder with the magnetic conductivity of 10000H/m +/-30%, bisphenol A epoxy resin and methyl tetrahydrophthalic anhydride are mixed according to a certain mass ratio and then cured to form the magnetic resistance component with the gradient magnetic conductivity. The ratios of the volume fractions of the materials corresponding to the sub-magnetoresistive elements of different permeability are shown in table 1.

TABLE 1 distribution table of permeability values and Mn-Zn ferrite powder ratios

Permeability number (H/m)	Ratio of Mn-Zn ferrite powder
		1000	30％
2000	42.5％
		3000	50％

The third sub-magnetoresistive element having a magnetic permeability of a stable value smaller than a preset value is manufactured by the following process:

(1) weighing and adding epoxy resin and a curing agent into a beaker according to the proportion, primarily stirring by using a glass rod, and then adding an alumina filler, an anti-settling agent and a silane coupling agent;

(2) pouring into three-necked flask, heating in water bath at 80 deg.C, and mechanically stirring for 20 min;

(3) degassing with vacuum pump under high speed mechanical stirring for 30min, adding accelerator, and degassing for 20 min;

(4) and pouring the epoxy resin blend into the mold along the inner wall of the mold, putting the mold into an oven, and curing for 6 hours at the temperature of 110 ℃.

The first sub-magnetoresistive component and the second sub-magnetoresistive component, the magnetic permeability of which is continuously changed, are manufactured by adopting the following processes:

(1) weighing and adding epoxy resin and a curing agent into a beaker according to the proportion, primarily stirring by using a glass rod, and then adding an alumina filler, an anti-settling agent and a silane coupling agent;

(2) pouring into three-necked flask, heating in water bath at 80 deg.C, and mechanically stirring for 20 min;

(3) degassing with vacuum pump under high speed mechanical stirring for 30min, adding accelerator, and degassing for 20 min;

(4) and fixing the bottom of the cylindrical mold by adopting a centrifugal machine, and centrifuging at the speed of 450r/min-500r/min to ensure that the manganese zinc ferrite powder dispersed in the epoxy is accumulated to one end of the mold under the action of centrifugal force, thereby forming a first sub-magnetic resistance component and a second sub-magnetic resistance component with gradient magnetic conductivity.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.