Safety assessment method for liquid-immersed shunt reactor and shunt reactor

Abstract

The present invention provides a liquid-immersed shunt reactor safety assessment method and shunt reactor. The liquid-immersed shunt reactor safety assessment method includes: establishing a three-dimensional model of the shunt reactor; setting the first material property, excitation condition and first boundary condition of the electromagnetic calculation module to obtain the excitation surge current waveform at different closing time points within a certain electrical cycle; judging whether the excitation surge current waveform decays to the rated value, if the excitation surge current waveform decays to the rated value, setting the second material property, contact parameter and second boundary condition of the structural calculation module; coupling the transient result calculated by the electromagnetic calculation module to the structural calculation module as a calculation load to obtain the stress condition of the iron core and / or coil from the occurrence of the excitation surge current to the current decaying to the rated value, and obtaining the safety margin of each structural component based on the stress condition. The present invention solves the problem in the prior art that the safety margin of the internal structural components of the shunt reactor with an iron core cannot be accurately obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage power transmission and distribution, and in particular to a safety assessment method for a liquid-immersed shunt reactor and the shunt reactor. Background Art

[0002] At present, shunt reactors are important electrical equipment used for reactive power compensation in power systems. Large-capacity, high-voltage reactors are usually liquid-immersed structures, that is, the reactor body is immersed in insulating oil for cooling and heat dissipation.

[0003] In the existing technology, as the power grid system develops towards high-voltage, large-capacity, long-distance power transmission projects, the application scenarios of liquid-immersed shunt reactors are becoming more and more extensive. As an important equipment, they are widely used in key occasions such as line reactive power compensation and short-circuit current limitation. Specifically, under the rated state, the electric force generated on the coil and iron core of the shunt reactor is not large, but when the circuit is closed, the shunt reactor is suddenly excited and the excitation surge current it bears is much greater than the rated current at the time of design. The electric force will increase sharply, causing the structural parts of the shunt reactor to be under greater risk. Among them, when the excitation surge current occurs, the iron core and coil will generate a large electric force with short-term repeated impacts, and the duration and current peak of the electric force are related to the structure of the shunt reactor. It is necessary to ensure that the force on all structural parts does not exceed the yield strength of the material itself.

[0004] However, the existing technology for evaluating the safety of excitation inrush current of liquid-immersed shunt reactors has certain shortcomings. The existing technology generally uses air-core reactors, while for shunt reactors with iron cores, the silicon steel sheets used in the iron cores are a nonlinear ferromagnetic material with a magnetic saturation effect, which increases the complexity of the calculation of the excitation inrush current and makes it impossible to accurately obtain the safety margin of all structural components in the shunt reactor. Summary of the Invention

[0005] The main purpose of the present invention is to provide a liquid-immersed shunt reactor safety assessment method and a shunt reactor, so as to solve the problem in the prior art that the safety margin of all internal structural components of a shunt reactor with an iron core cannot be accurately obtained.

[0006] To achieve the above objectives, according to one aspect of the present invention, a method for safety assessment of a liquid-immersed shunt reactor is provided, comprising: step S1: establishing a three-dimensional model of the shunt reactor; step S2: setting first material properties, excitation conditions, and first boundary conditions of an electromagnetic calculation module of the three-dimensional model to obtain the excitation inrush current waveform of the shunt reactor at different closing time points within a certain electrical cycle; step S3: determining whether the excitation inrush current waveform has decayed to a rated value; if so, setting second material properties, contact parameters, and second boundary conditions of a structural calculation module of the three-dimensional model; and step S4: coupling transient results calculated by the electromagnetic calculation module to the structural calculation module as a calculation load to obtain stress conditions on the core and / or coil of the shunt reactor from the time the excitation inrush current occurs to the time the current decays to the rated value, and obtaining the safety margin of each structural component in the structural calculation module based on the stress conditions; wherein the first material properties include the magnetic permeability and electrical conductivity of the electromagnetic material, and the second material properties include the elastic modulus and Poisson's ratio.

[0007] Furthermore, the method for obtaining the excitation inrush current waveform of the shunt reactor at different closing time points within a certain power cycle includes: using a magnetic field coupling external circuit method and adjusting the closing phase angle of the shunt reactor to obtain the excitation inrush current waveform of the shunt reactor at different closing time points.

[0008] Furthermore, in step S2, the method for setting the first material property of the electromagnetic calculation module includes: setting the magnetic permeability of the iron core of the shunt reactor to an asymmetric BH curve; and / or, the method for setting the excitation condition of the electromagnetic calculation module includes: using the voltage source as the excitation condition and the rated voltage amplitude as the excitation value; and / or, the method for setting the first boundary condition of the electromagnetic calculation module includes: setting the default magnetic field calculation boundary in which the magnetic lines of force are parallel to the air bag as the first boundary condition.

[0009] Furthermore, in step S3, in the process of determining whether the excitation inrush current waveform has decayed to the rated value, if the excitation inrush current waveform has not decayed to the rated value, the electrical cycle is increased until the excitation inrush current waveform decays to the rated value.

[0010] Furthermore, in step S3, the method of setting the second material properties of the structural calculation module includes: setting the elastic module and Poisson's ratio of at least one material of electrical steel, steel, insulating struts, and marble used by the parallel reactor; and / or, the method of setting the contact parameters of the structural calculation module includes: setting the friction coefficient between different structural parts to be greater than or equal to 0.1 and less than or equal to 0.15; and / or, the method of setting the second boundary conditions of the structural calculation module includes: applying a fixed constraint to a preset position of the parallel reactor.

[0011] Furthermore, the three-dimensional model of the shunt reactor includes: an air domain; an iron core located in the air domain; and a coil wrapped around the iron core and located in the air domain.

[0012] Furthermore, the method for obtaining the safety margin of each structural component in the structural calculation module according to the stress conditions includes: obtaining the maximum stress of each structural component and the yield strength of the material used for the structural component; if the maximum stress is less than the yield strength, then the difference between the maximum stress and the yield strength is the safety margin of the structural component.

[0013] Furthermore, the structural calculation module of the shunt reactor includes: an iron core, comprising a plurality of iron core cakes arranged at intervals, with a gap between two adjacent iron core cakes, and a protrusion made of marble provided on one end face of each iron core cake, forming a gap between the protrusion and another iron core cake adjacent to the iron core cake; a coil wrapped around the iron core; and a support structure arranged inside the coil to support the vertical oil channel.

[0014] Furthermore, the preset position is the bottom of the shunt reactor.

[0015] According to another aspect of the present invention, a shunt reactor is provided, which adopts the above-mentioned safety assessment method for a liquid-immersed shunt reactor.

[0016] By applying the technical solution of the present invention, when a safety assessment of a liquid-immersed shunt reactor is required, a three-dimensional model of the shunt reactor is first established, and the first material properties, excitation conditions, and first boundary conditions of the electromagnetic calculation module of the three-dimensional model are set to obtain the excitation inrush current waveform of the shunt reactor at different closing time points within a certain electrical cycle; then, it is determined whether the excitation inrush current waveform has decayed to the rated value. If the excitation inrush current waveform has decayed to the rated value, the second material properties, contact parameters, and second boundary conditions of the structural calculation module of the three-dimensional model are set; finally, the transient results calculated by the electromagnetic calculation module are coupled to the structural calculation module as a calculation load to obtain the stress conditions of the iron core and / or coil of the shunt reactor from the occurrence of the excitation inrush current to the decay of the current to the rated value, and the safety margin of each structural component in the structural calculation module is obtained based on the stress conditions, thereby solving the problem in the prior art that the safety margin of all internal structural components of a shunt reactor with an iron core cannot be accurately obtained. In this way, the safety assessment method of the liquid-immersed shunt reactor in the present application is based on a numerical calculation method, which realizes the transient calculation of the reactor excitation inrush current waveform and analyzes the safety performance of the mechanical structure of the shunt reactor against inrush current. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 A schematic diagram of the three-dimensional structure of an embodiment of a shunt reactor according to the present invention is shown;

[0019] Figure 2 Shown Figure 1 Schematic diagram of the partial three-dimensional structure of the shunt reactor after the core and coil are assembled;

[0020] Figure 3 Shown Figure 1 Nonlinear BH curve of the magnetic permeability of the core of the shunt reactor;

[0021] Figure 4 The waveform of the magnetizing inrush current when the circuit breaker is closed at an electrical angle of 0° is shown.

[0022] Figure 5 The waveform of the magnetizing inrush current when the circuit breaker is closed at an electrical angle of 30° is shown.

[0023] Figure 6 The waveform of the magnetizing inrush current when the circuit breaker is closed at an electrical angle of 60° is shown.

[0024] Figure 7 The waveform of the magnetizing inrush current when the circuit breaker is closed at an electrical angle of 90° is shown.

[0025] Figure 8 A flow chart of a method for safety assessment of a liquid immersed shunt reactor according to the present invention is shown.

[0026] The above drawings include the following reference numerals:

[0027] 10. Iron core; 11. Iron core cake; 12. Protrusion;

[0028] 20. Coil;

[0029] 30. Core clamping parts;

[0030] 40. Positioning pins;

[0031] 80. Support structure. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0034] In the present invention, unless otherwise specified, directional words such as "up" and "down" are generally used with respect to the directions shown in the drawings, or with respect to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" are generally used with respect to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0035] In order to solve the problem in the prior art that it is impossible to accurately obtain the safety margins of all internal structural components of a shunt reactor with an iron core, the present application provides a liquid-immersed shunt reactor safety assessment method and a shunt reactor.

[0036] like Figures 1 to 8 As shown in Figure 2, the safety assessment method for liquid-immersed shunt reactors includes:

[0037] Step S1: establishing a three-dimensional model of the shunt reactor;

[0038] Step S2: setting a first material property, an excitation condition, and a first boundary condition of the electromagnetic calculation module of the three-dimensional model to obtain the excitation inrush current waveform of the shunt reactor at different closing time points within a certain power cycle;

[0039] Step S3: determining whether the excitation inrush current waveform has decayed to a rated value; if so, setting a second material property, contact parameter, and second boundary condition of a structural calculation module of the three-dimensional model;

[0040] Step S4: Couple the transient results calculated by the electromagnetic calculation module to the structural calculation module as a calculation load to obtain the stress conditions of the iron core 10 and / or coil 20 of the shunt reactor from the occurrence of the excitation surge current to the decay of the current to the rated value, and obtain the safety margin of each structural component in the structural calculation module based on the stress conditions.

[0041] The first material property includes the magnetic permeability and electrical conductivity of the electromagnetic material, and the second material property includes the elastic modulus and Poisson's ratio.

[0042] Applying the technical solution of this embodiment, the safety assessment method of the liquid-immersed shunt reactor in this embodiment is based on a numerical calculation method, which realizes the transient calculation of the reactor excitation surge current waveform and analyzes the safety performance of the mechanical structure of the shunt reactor in resisting surge current.

[0043] It should be noted that the establishment in step S1 includes two situations: newly establishing and using an existing three-dimensional model.

[0044] In this embodiment, the method for obtaining the excitation inrush current waveform of the shunt reactor at different closing time points within a certain power cycle includes:

[0045] The magnetic field coupling external circuit method is adopted and the closing phase angle of the shunt reactor is adjusted to obtain the excitation inrush current waveform of the shunt reactor at different closing time points.

[0046] Specifically, the closing phase angle of the shunt reactor is usually controlled by a pulse circuit. By adjusting the closing phase angle, the excitation inrush current waveform at different closing time points can be obtained. Among them, the coil current values calculated by selecting different closing phase angles are as follows: Figures 4 to 7 As shown, Figure 4 This is the waveform of the magnetizing inrush current when the voltage exceeds 0V and the circuit breaker is closed. At this time, the electrical angle is 0°. Figure 5 This is the waveform of the magnetizing inrush current when the electrical angle is 30°. Figure 6 This is the waveform of the magnetizing inrush current when the electrical angle is 60°. Figure 7 The waveform of the magnetizing inrush current when the voltage is at the peak voltage and the circuit breaker is closed, at which point the electrical angle is 90°.

[0047] It can be seen that the value of the excitation inrush current is related to the selected closing phase angle. When the electrical angle is 0° and the voltage is closed, the excitation inrush current is maximum. When the electrical angle is 90° and the voltage is closed, the excitation inrush current hardly occurs.

[0048] Optionally, in step S2, the method for setting the first material property of the electromagnetic calculation module includes: setting the magnetic permeability of the core of the shunt reactor to an asymmetric BH curve; and / or, the method for setting the excitation condition of the electromagnetic calculation module includes: using a voltage source as the excitation condition and a rated voltage amplitude as the excitation value; and / or, the method for setting the first boundary condition of the electromagnetic calculation module includes: setting a default magnetic field calculation boundary in which magnetic lines of force are parallel to an air pocket as the first boundary condition. Thus, the above-mentioned settings make setting the first material property, excitation condition, and first boundary condition of the electromagnetic calculation module of the three-dimensional model easier and simpler, reducing the workload of the operator.

[0049] In this embodiment, for the setting of the first material property of the electromagnetic calculation module, the parameters of different electromagnetic materials are mainly magnetic permeability and electrical conductivity. The core of the reactor is a nonlinear ferromagnetic material, and its magnetic permeability is an asymmetric BH curve. Different from the traditional BH curve, the asymmetric BH curve can accurately simulate the residual magnetic B in the core. r Impact on the excitation inrush current. Regarding the excitation conditions of the electromagnetic calculation module, the calculation uses a magnetic field coupled external circuit method. The excitation is a voltage source, the value is the rated voltage amplitude, and the closing angle is controlled by a pulse circuit. The excitation inrush current waveform at different closing time points can be obtained by adjusting the closing electrical phase angle.

[0050] Specifically, using the BKD-60000 / 550 liquid-immersed shunt reactor as an example, the inrush current waveform of the shunt reactor is calculated. The transient volume force density calculated by the electromagnetic module is coupled to the structural mechanics module to analyze the stresses on various structural components during the inrush current and assess the reactor's safety. The main performance parameters of the BKD-60000 / 550 reactor are shown in Table 1, and the selection of the primary material properties is shown in Table 2.

[0051] Table 1 Main performance parameters of BKD-60000 / 550 reactor

[0052]

[0053] Table 2 First material properties table

[0054]

[0055] Among them, the magnetic permeability of the silicon steel sheet uses an asymmetric BH curve to simulate the hysteresis loop. When H is 0, there is still a certain magnetic density in the core, simulating the residual magnetism B r , the BH curve of the core is as follows Figure 3 shown.

[0056] In this embodiment, in step S3, when determining whether the excitation inrush current waveform has decayed to the rated value, if the excitation inrush current waveform has not decayed to the rated value, the electrical cycle is increased until the excitation inrush current waveform decays to the rated value.

[0057] Specifically, after setting the initial calculated electrical cycle length and starting the calculation, if the attenuation of the excitation surge current waveform has not ended after the initial set electrical cycle calculation is completed, the calculated electrical cycle is increased until the excitation surge current waveform decays to the rated value. At this point, the maximum current value of the excitation surge current, the waveform of the excitation surge current, and the duration of the excitation surge current can be obtained.

[0058] Optionally, in step S3, the method of setting the second material properties of the structural calculation module includes: setting the elastic module and Poisson's ratio of at least one material of electrical steel, steel, insulating struts, and marble used by the parallel reactor; and / or, the method of setting the contact parameters of the structural calculation module includes: setting the friction coefficient between different structural parts to be greater than or equal to 0.1 and less than or equal to 0.15; and / or, the method of setting the second boundary conditions of the structural calculation module includes: applying a fixed constraint to a preset position of the parallel reactor.

[0059] In this embodiment, the second material properties of the structural calculation module are set, and the materials used for all structural components primarily include silicon steel sheets, marble, copper wire, and insulating stays. The second material properties primarily include elastic modulus and Poisson's ratio. Regarding the contact parameters of the structural calculation module, the contact relationships between different structural components are primarily binding contact and frictional contact. Frictional contact requires a corresponding friction coefficient determined based on the material. The second material properties are shown in Table 3.

[0060] Table 3 Second material properties

[0061]

[0062] In this embodiment, the three-dimensional model of the shunt reactor includes an air domain, an iron core 10, and a coil 20. The iron core 10 is located in the air domain, and the coil 20 is wrapped around the iron core 10 and located in the air domain.

[0063] like Figure 2 As shown, the structural calculation module of the shunt reactor includes an iron core 10, a coil 20 and a support structure 80. The iron core 10 includes a plurality of core cakes 11 arranged at intervals, with a gap between two adjacent core cakes 11. A convex portion 12 made of marble is provided on one end face of each core cake 11, and a gap is formed between the convex portion 12 and another core cake 11 adjacent to the core cake 11. The coil 20 is wrapped around the outside of the iron core 10. The support structure 80 is arranged inside the coil 20 to support the vertical oil channel. In this way, the convex portion 12 plays the role of supporting the core cake 11 and forming an air gap, so that the iron core 10 has a low magnetic permeability structure, and the magnetic permeability is similar to that of air.

[0064] In this embodiment, the method for obtaining the safety margin of each structural component in the structural calculation module according to the stress conditions includes:

[0065] Obtain the maximum stress of each structural component and the yield strength of the material used for the structural component;

[0066] If the maximum stress is less than the yield strength, the difference between the maximum stress and the yield strength is the safety margin of the structural member.

[0067] Specifically, the maximum stress in coil 20 is 3 MPa, far less than the material's yield strength, thus providing good protection against inrush current. The maximum stress in core 10 is 1.3 MPa, also far less than the material's yield strength, thus providing excellent protection against inrush current. Thus, by calculating the maximum equivalent stress at each location through coupling, and comparing it with the yield strength of the material used for the structural component, the reactor's safety margin against inrush current can be determined.

[0068] In this embodiment, the preset position is the bottom of the shunt reactor.

[0069] like Figure 1 As shown, the shunt reactor further includes a core clamp 30 and a positioning pin 40, which clamps the core 10 of the core clamp 30. The shunt reactor is a single coil. The positioning pin 40 fixes and limits the body of the reactor.

[0070] The present application also provides a shunt reactor, which adopts the above-mentioned liquid-immersed shunt reactor safety assessment method.

[0071] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0072] When a safety assessment of a liquid-immersed shunt reactor is required, a three-dimensional model of the shunt reactor is first established, and the first material properties, excitation conditions, and first boundary conditions of the electromagnetic calculation module of the three-dimensional model are set to obtain the excitation inrush current waveform of the shunt reactor at different closing time points within a certain electrical cycle. Then, it is determined whether the excitation inrush current waveform has decayed to the rated value. If the excitation inrush current waveform has decayed to the rated value, the second material properties, contact parameters, and second boundary conditions of the structural calculation module of the three-dimensional model are set. Finally, the transient results calculated by the electromagnetic calculation module are coupled to the structural calculation module as a calculation load to obtain the stress conditions of the iron core and / or coil of the shunt reactor from the occurrence of the excitation inrush current to the current decaying to the rated value. The safety margin of each structural component in the structural calculation module is obtained based on the stress conditions, thereby solving the problem in the prior art that the safety margin of all internal structural components of a shunt reactor with an iron core cannot be accurately obtained. In this way, the safety assessment method of the liquid-immersed shunt reactor in the present application is based on a numerical calculation method, which realizes the transient calculation of the reactor excitation inrush current waveform and analyzes the safety performance of the mechanical structure of the shunt reactor against inrush current.

[0073] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0074] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0075] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0076] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for safety assessment of a liquid-immersed shunt reactor, characterized in that: include: Step S1: establishing a three-dimensional model of the shunt reactor; Step S2: setting a first material property, an excitation condition, and a first boundary condition of an electromagnetic calculation module of the three-dimensional model on the three-dimensional model of the liquid-immersed shunt reactor to obtain an excitation inrush current waveform of the shunt reactor at different closing time points within a certain electrical cycle; Step S3: determining whether the excitation inrush current waveform has decayed to a rated value; if so, setting a second material property, contact parameter, and second boundary condition of a structural calculation module of the three-dimensional model; Step S4: coupling the transient result calculated by the electromagnetic calculation module to the structural calculation module as a calculation load, so as to obtain the stress condition of the iron core (10) and / or the coil (20) of the shunt reactor from the occurrence of the excitation inrush current to the decay of the current to the rated value, and obtaining the safety margin of each structural component in the structural calculation module according to the stress condition; Wherein, the first material property includes magnetic permeability and electrical conductivity of the electromagnetic material, and the second material property includes elastic modulus and Poisson's ratio; Using a voltage source as the excitation condition; Setting the default magnetic field calculation boundary in which the magnetic field lines are parallel to the air pocket as the first boundary condition; A fixed constraint is imposed on a preset position of the shunt reactor as the second boundary condition.

2. The method for safety assessment of a liquid-immersed shunt reactor according to claim 1, wherein: The method for obtaining the excitation inrush current waveform of the shunt reactor at different closing time points within a certain power cycle includes: A magnetic field coupling external circuit method is adopted and the closing phase angle of the shunt reactor is adjusted to obtain the excitation inrush current waveform of the shunt reactor at different closing time points.

3. The method for safety assessment of a liquid-immersed shunt reactor according to claim 1, wherein: In step S2, The method for setting the first material property of the electromagnetic calculation module includes: Setting the magnetic permeability of the core of the shunt reactor to an asymmetric BH curve; And / or, the method for setting the excitation condition of the electromagnetic calculation module includes: Use the rated voltage amplitude as the excitation value.

4. The method for safety assessment of a liquid-immersed shunt reactor according to claim 1, wherein: In step S3, when determining whether the excitation inrush current waveform has decayed to the rated value, if the excitation inrush current waveform has not decayed to the rated value, the electrical cycle is increased until the excitation inrush current waveform decays to the rated value.

5. The method for safety assessment of liquid-immersed shunt reactor according to claim 1, characterized in that: In step S3, The method for setting the second material property of the structural calculation module includes: Setting the elastic module and Poisson's ratio of at least one material of steel, insulating support bars, and marble used in the shunt reactor; And / or, the method for setting the contact parameters of the structure calculation module includes: The friction coefficient between different structural parts is set to be greater than or equal to 0.1 and less than or equal to 0.

15.

6. The method for safety assessment of a liquid-immersed shunt reactor according to claim 1, wherein: The three-dimensional model of the shunt reactor includes: air domain; An iron core (10) is located in the air domain; The coil (20) is wrapped outside the iron core (10) and is located in the air domain.

7. The method for safety assessment of liquid-immersed shunt reactor according to claim 1, characterized in that: The method for obtaining the safety margin of each structural component in the structural calculation module according to the stress condition includes: Obtain the maximum stress of each structural component and the yield strength of the material used for the structural component; If the maximum stress is less than the yield strength, the difference between the maximum stress and the yield strength is the safety margin of the structural component.

8. The method for safety assessment of a liquid-immersed shunt reactor according to any one of claims 1, 5 or 7, wherein: The structure calculation module of the shunt reactor includes: An iron core (10) comprises a plurality of iron core cakes (11) arranged at intervals, wherein a gap is provided between two adjacent iron core cakes (11), and a convex portion (12) made of marble is provided on one end face of each iron core cake (11), and the gap is formed between the convex portion (12) and another iron core cake (11) adjacent to the iron core cake (11); A coil (20) wrapped around the iron core (10); A support structure (80) is provided in the coil (20) for supporting a vertical oil passage.

9. The method for safety assessment of a liquid-immersed shunt reactor according to claim 5, wherein: The preset position is the bottom of the shunt reactor.

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