Method for determining parameters of multi-product adaptable transformer

Abstract

The invention discloses a multi-product adaptive transformer parameter establishment method, which comprises the following steps: analyzing an existing parameter model, and giving parallel operation conditions; formulating a spare part grade standard based on a parallel operation condition and giving an optimization interval; and determining a parameter range and a constant value by combining the energy efficiency ratio and the safety of the optimization interval. Due to the flexible spare transformer, the fault transformer can be removed without influencing the power supply reliability of the load, and meanwhile, the voltage fluctuation is reduced when large equipment is started, and the power supply quality is improved. And the design thought is perfect and reasonable, all parallel operation conditions are met, the transformer winding rectification efficiency is further optimized, the load is reduced, and the cost is saved.

Description

Technical Field

[0001] The invention relates to the field of transformers, and in particular to a method for establishing parameters of transformers that can adapt to multiple products. Background Art

[0002] At present, due to the large number of transformer types and quantities, the existing spare transformers are not versatile enough, and the types and models of compatible transformers are limited. It is costly to equip each operating transformer with a spare transformer of the corresponding model, and the resource utilization rate is low, making it difficult to promote it comprehensively. However, if there is no suitable spare transformer to use in the event of a fault, it will be difficult to restore power supply in time, which will cause economic losses.

[0003] Therefore, a 220kV flexible spare transformer design concept that is adaptable to multiple scenarios is provided. It can operate in parallel with multiple types of 220kV main transformers, reduce the internal resistance of the power supply system, reduce the loss caused by power transmission, and at the same time reduce the spare capacity of the entire system. The number of transformers put into operation can be reasonably adjusted according to the size of the access system load. When the transformer fails or needs maintenance, it can still complete the power supply tasks and needs safely and stably, and finally be implemented on suitable equipment. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the title of the invention of this application to avoid blurring the purpose of this section, the abstract of the specification and the title of the invention, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the fact that the existing standby transformers in the above-mentioned prior art are not versatile enough and the types and models of compatible transformers are limited, it is costly to equip each operating transformer with a standby transformer of the corresponding model, and the resource utilization rate is low, which makes it difficult to promote it comprehensively. However, if there is no compatible standby transformer to use in the event of a fault, it will be difficult to restore power supply in time, which will cause economic losses. Therefore, the present invention is proposed.

[0006] Therefore, the technical problem to be solved by the present invention is to design a 220kV flexible spare transformer that is adaptable to multiple scenarios. The 220kV flexible spare transformer can be operated in parallel with multiple types of 220kV main transformers to reduce the internal resistance of the power supply system, reduce the loss caused by power transmission, and at the same time reduce the spare capacity of the entire system. The number of transformers put into operation can be reasonably adjusted according to the size of the load of the access system to improve the economy and operation efficiency of the entire system. When the transformer fails or needs maintenance, due to the existence of a flexible spare transformer, the faulty transformer can be removed without affecting the power supply reliability of the load. At the same time, voltage fluctuations can be reduced when large equipment is started, thereby improving the power supply quality.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for establishing parameters of a transformer that can adapt to multiple products, comprising: analyzing an existing parameter model and providing parallel operation conditions;

[0008] Formulate spare parts grade standards based on parallel operation conditions and provide optimization intervals;

[0009] Determine the parameter range and set value based on the energy efficiency ratio and safety of the optimization range.

[0010] As a preferred solution of the method for establishing parameters of a transformer that can adapt to multiple products of the present invention, wherein: the adapted 220KV flexible power transformer uses the rated capacitance, rated voltage, impedance voltage, and connection group related values ​​as the existing parameter model;

[0011] The parallel operation conditions include:

[0012] The voltage ratio is the same, with a tolerance of ±0.5%;

[0013] Impedance voltage value difference <±10%;

[0014] The wiring groups are the same;

[0015] The transformer capacitance ratio shall not exceed 3:1.

[0016] As a preferred solution of the method for establishing parameters of a transformer capable of adapting to multiple products according to the present invention, the spare parts parameter model is determined based on the parallel operation conditions, and the optimization interval is determined as follows:

[0017] The core part, the insulation part of the body, and the coil part;

[0018] Determine the core structure and effective parameter settings;

[0019] Determine the insulation material and coil connection method;

[0020] Determine the coil winding structure and the number of turns of the voltage regulating coil.

[0021] As a preferred solution of the method for establishing parameters of a transformer that can adapt to multiple products according to the present invention, wherein: in setting the existing parameter model,

[0022] Rated capacity (MVA): 150 / 150 / 75, 180 / 180 / 60, 180 / 180 / 90, 240 / 240 / 80, 240 / 240 / 120;

[0023] Rated voltage (kV): 220 (230) ± 8 × 1.25% / 115 (121) / 10.5 (11), 220 (230) ± 8 × 1.25% / 115 (121) / 36 (38.5);

[0024] Impedance voltage (%): 14 / 35 / 50, 14 / 21 / 35;

[0025] Impedance voltage (%): 14 / 35 / 50, 14 / 21 / 35;

[0026] Connection groups: YNyn0d11, YNyn0yn0+d.

[0027] As a preferred solution of the method for establishing parameters of a transformer that can adapt to multiple products according to the present invention, based on the existing parameter model and in combination with the parallel operation conditions, the parameter model of the standby transformer is given as follows:

[0028] Rated voltage: 230±12×1.25% / 121±2×2.5% / 11+38.5kV;

[0029] Rated capacity: 165 / 165 / 82.5+82.5MVA;

[0030] Impedance voltage: 14% / 50% / 35% or 14% / 35% / 21%;

[0031] Connection group: YNyn0yn0+d11;

[0032] It can be determined that the spare transformer is a three-phase three-winding transformer with a frequency of 50Hz.

[0033] As a preferred solution of the method for establishing parameters of a transformer that can adapt to multiple products of the present invention, wherein: according to the parameters of the spare transformer, it is determined that the core adopts a three-phase five-column type with six-level steps;

[0034] Collect winding information and substitute it into the formula to calculate the core size parameters;

[0035] The calculated results are adjusted based on the empirical coefficient and compared with the standardized dimensions;

[0036] After comparison, feasible options are determined, and other core parameters are further calculated. The above steps are repeated using the existing parameters to determine other core values ​​one by one.

[0037] As a preferred solution of the method for establishing parameters of a transformer that can adapt to multiple products according to the present invention, the following is provided: based on the type of the adapted 220KV flexible power transformer, it is determined that the spare parts are provided with coils of two voltage levels, 10KV and 35KV;

[0038] The coil connection method has the ability to realize the YNyn0d11 connection method;

[0039] The coil arrangement order from the core to the outside is: voltage stabilizer - low voltage - medium voltage - high voltage - voltage regulator. The voltage stabilizer coil absorbs external high-frequency interference signals, protects low-voltage and medium-voltage coils, and assists in heat dissipation.

[0040] The overall suit structure is adopted to reduce the air gap and reduce the unevenness of the electric field strength.

[0041] As a preferred solution of the method for establishing parameters of a multi-product adaptable transformer of the present invention, wherein: according to the expected output voltage of the coil, the coil type is selected, and the turn potential and the number of turns are calculated by substituting into the formula;

[0042] The low voltage coil adopts a spiral structure;

[0043] The medium voltage coil adopts a continuous structure;

[0044] The high voltage coil adopts an inner screen continuous structure;

[0045] According to E t =4.44×f×B m ×S zh ,

[0046] Among them, U ph is the phase voltage, E t is the potential per turn, f is the rated frequency 50Hz, B m Take 1.73T and S for the magnetic flux density. zh is the effective cross-sectional area of ​​the core column, N t is the number of coil turns.

[0047] The beneficial effects of the present invention are as follows: due to the existence of the flexible spare transformer, the faulty transformer can be cut off without affecting the power supply reliability of the load, and at the same time, the voltage fluctuation is reduced when the large equipment is started, thereby improving the power supply quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0049] Figure 1 A logical schematic diagram of a method for establishing parameters of a multi-product adaptable transformer according to an embodiment of the present invention;

[0050] Figure 2 A three-phase five-column core form diagram of a method for establishing parameters of a transformer that can adapt to multiple products according to an embodiment of the present invention;

[0051] Figure 3 A schematic diagram of the coil structure arrangement of a method for establishing parameters of a multi-product adaptable transformer according to an embodiment of the present invention. DETAILED DESCRIPTION

[0052] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0053] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0054] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0055] Furthermore, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0056] Example 1

[0057] Reference Figures 1 to 3 ,This embodiment provides a method for establishing parameters of a transformer that can adapt to multiple products, including analyzing existing parameter models and providing parallel operation conditions;

[0058] Formulate spare parts grade standards based on parallel operation conditions and provide optimization intervals;

[0059] Determine the parameter range and set value based on the energy efficiency ratio and safety of the optimization range.

[0060] The parameters of the spare transformer must be compatible with the existing transformer so that it can be seamlessly replaced or operated in parallel when necessary. Its parameters must also ensure that it will not cause damage to the grid or other equipment after being connected to the grid and have a certain degree of flexibility to adapt to different operating conditions.

[0061] Example 2

[0062] Reference Figures 1 to 3 , which is the second embodiment of the present invention, and is based on the previous embodiment, and is different from the previous embodiment in that: the adapted 220KV flexible power transformer uses the rated capacitance, rated voltage, impedance voltage, and connection group related values ​​as the existing parameter model;

[0063] The parallel operation conditions can be based on the existing power system to find out several important parameters that affect the main operation path of the transformer, including:

[0064] The voltage ratio is the same, with a tolerance of ±0.5%;

[0065] Impedance voltage value difference <±10%;

[0066] The wiring groups are the same;

[0067] The transformer capacitance ratio shall not exceed 3:1.

[0068] Example 3

[0069] Reference Figures 1 to 3 , which is the third embodiment of the present invention, is based on the previous embodiment, and is different from the previous embodiment in that: the spare part parameter model is determined based on the parallel operation condition, and the optimization interval is determined as:

[0070] The core part, the body insulation part, and the coil part play a decisive role in the process of transformer rectification and transformation. The core structure and the body insulation part determine the transformation range and efficiency. The structural design of the coil needs to cooperate with the body insulation to complete the implementation of the coil safety and the optimization of the coil process for load and conventional performance.

[0071] The specific steps include the following: determine the core structure and effective parameter values; determine the insulation material and coil connection method; determine the coil winding structure and the number of turns of the voltage regulating coil. These steps will form a new design idea based on the existing electromagnetic field knowledge and parallel requirements, combining the design logic of the two.

[0072] Example 4

[0073] Reference Figures 1 to 3 , which is the fourth embodiment of the present invention, is based on the previous embodiment, and is different from the previous embodiment in that: in the existing parameter model,

[0074] Rated capacity (MVA): 150 / 150 / 75, 180 / 180 / 60, 180 / 180 / 90, 240 / 240 / 80, 240 / 240 / 120; these numbers represent the capacity of the three windings, high, medium and low voltage windings.

[0075] In order to be compatible with all existing transformers, the rated voltage of the spare transformer needs to cover all possible voltage combinations as much as possible.

[0076] Rated voltage (kV): 220 (230) ± 8 × 1.25% / 115 (121) / 10.5 (11), 220 (230) ± 8 × 1.25% / 115 (121) / 36 (38.5), the values ​​in brackets represent different voltage level options, and the values ​​separated by slashes represent the rated voltages of different windings.

[0077] Impedance voltage (%): 14 / 35 / 50, 14 / 21 / 35, they affect the voltage drop and power loss of the transformer when the load changes, and are also divided into three groups.

[0078] Connection group: YNyn0d11, YNyn0yn0+d. These groups ensure that the transformer can maintain the correct phase when connected to the grid, which is crucial for parallel operation and system stability. It determines the phase relationship of the transformer

[0079] Based on the existing parameter model and combined with the parallel operation conditions, the parameter model of the standby transformer is given as follows:

[0080] Rated voltage: 230±12×1.25% / 121±2×2.5% / 11+38.5kV; this can meet all given voltage ranges.

[0081] Rated capacity: 165 / 165 / 82.5+82.5MVA; the above range is selected based on the capacity ratio not exceeding 3:1 in the parallel operation condition. This capacity is compatible with all given transformer capacities and will not cause the capacity ratio to exceed 3:1.

[0082] Impedance voltage: 14% / 50% / 35% or 14% / 35% / 21%, the impedance voltage value in the parallel operation condition differs by less than ±10%, and these values ​​are within the impedance voltage range of existing transformers, ensuring compatibility.

[0083] Connection group: YNyn0yn0+d11, this group is compatible with all given connection groups.

[0084] It can be determined that the spare transformer is three-phase three-winding with a frequency of 50Hz, which is the general transformer standard.

[0085] Example 5

[0086] Reference Figures 1 to 3 , which is the fifth embodiment of the present invention, and is based on the previous embodiment, and is different from the previous embodiment in that: according to the spare transformer parameters, it is determined that the core adopts a three-phase five-column type with six-level steps;

[0087] Collect winding information and substitute it into the formula to calculate the core size parameters;

[0088] The calculated results are adjusted based on the empirical coefficient and compared with the standardized dimensions;

[0089] After comparison, feasible options are determined, and other core parameters are further calculated. The above steps are repeated using the existing parameters to determine other core values ​​one by one.

[0090] In detail, through the formula Confirm the core diameter D0 and P respectively zh Capacity per column, K d is the core diameter empirical coefficient. For three-phase three-winding, K is generally used. d =51~55,∑P ri is the sum of the rated capacities of all windings (kVA), m zh is the number of core columns with coils;

[0091] In actual design, we cannot simply use the calculated diameter, because we also need to consider standardization and feasibility in the manufacturing process. Therefore, we need to find a list of standardized core diameters, and then select the diameter closest to the calculated value from the list as the final design size;

[0092] Once a standardized core diameter is selected, we need to check again all relevant electrical performance indicators, such as flux density, losses, etc., to ensure that they still meet the design requirements. If necessary, it may be necessary to fine-tune the core diameter or other parameters.

[0093] Furthermore, according to the calculation results and the standardized dimensions, it was determined that the core diameter D0 = 880 / 888 mm.

[0094] The window height H0 = 2335 mm, which is a relatively high value, can accommodate more coil turns and improve the efficiency and stability of the transformer.

[0095] The core center distance M0 = 2050mm. A larger center distance can make maintenance more convenient, but it may also increase costs. 2050mm is a more moderate value that can ensure sufficient maintenance space without being too expensive.

[0096] The side yoke center distance M0'=1280mm refers to the distance between the yokes on both sides of the transformer. This distance also has a great influence on the overall layout and performance of the transformer. The side yoke center distance should be slightly larger than the core center distance to ensure the stability and safety of the transformer.

[0097] Except for the core diameter, the remaining dimensions also need to be calculated and standardized in a similar way.

[0098] Example 6

[0099] Reference Figures 1 to 3, which is the sixth embodiment of the present invention, is based on the previous embodiment, and is different from the previous embodiment in that: in order to adapt to the needs of different power grids, it is ensured that the transformer can operate within a wide impedance range. Based on the adapted 220KV flexible power transformer category, it is determined that the spare parts are equipped with coils of two voltage levels, 10KV and 35KV;

[0100] The coil connection method has the ability to realize the YNyn0d11 connection method;

[0101] The coil arrangement order from the core to the outside is: voltage stabilizer - low voltage - medium voltage - high voltage - voltage regulator (high voltage regulator and medium voltage regulator are arranged on the same coil). The voltage stabilizer coil absorbs external high-frequency interference signals, protects the low voltage and medium voltage coils, and assists in heat dissipation.

[0102] Adopt the integral set structure and the integral pressing plate, and define the pressure gap from the pressing plate to the yoke on the core and the insulation thickness of the upper and lower ends according to the design manual of our company. Reduce the air gap and reduce the unevenness of the electric field strength.

[0103] In detail, this structure has a wide impedance adjustment range, which can meet the "high-low" short-circuit impedance requirements of 20% to 70% or higher. The wide impedance adjustment range enables the transformer to operate under different load conditions without causing excessive current to flow through the winding, thereby reducing the increase in heat caused by excessive current, which is of great significance for maintaining the temperature stability of the insulation material.

[0104] The extreme tap impedance fluctuation of the structure is small. Usually, the extreme tap impedance deviates from the main tap impedance by ±10%. The 1 tap impedance is the largest, and the minimum tap impedance is close to the rated tap impedance percentage. Impedance deviation is easy to guarantee; the extreme tap impedance fluctuation is small, and the operation is stable. Small extreme tap impedance fluctuation means that the operating characteristics of the transformer at different tap positions do not change much, which helps to keep the working environment of the insulation material relatively stable and reduce the mechanical stress and thermal stress caused by frequent operation.

[0105] The load loss under this structure is basically the same as that of the conventional impedance transformer. Compared with the split winding structure, the no-load loss is smaller, which can be reduced by about 18%; the load loss is smaller, which can be reduced by about 18%; and the operation is economical.

[0106] Example 7

[0107] Reference Figures 1 to 3 , which is the seventh embodiment of the present invention, is based on the previous embodiment, and is different from the previous embodiment in that the coil type is selected according to the expected output voltage of the coil, and the impedance can be adjusted within the range of 20% to 70% or even higher by selecting a suitable coil structure and material.

[0108] Substitute into the formula to calculate the turn potential and number of turns;

[0109] The low voltage coil adopts a spiral structure;

[0110] The medium voltage coil adopts a continuous structure;

[0111] The high voltage coil adopts an inner screen continuous structure;

[0112] According to E t =4.44×f×B m ×S zh , The derivation of this formula comes from the law of electromagnetic induction, namely Faraday's law of electromagnetic induction, which states that the electromotive force (EMF) in a closed loop is caused by the change of magnetic flux passing through the loop. In this case, we control the number of turns of the coil to ensure that the electromotive force generated by each coil meets the designed voltage requirements.

[0113] Among them, U ph is the phase voltage, E t is the potential per turn, f is the rated frequency 50Hz, B m Take 1.73T and S for the magnetic flux density. zh is the effective cross-sectional area of ​​the core column, N t is the number of coil turns.

[0114] Detailed, U ph Determined according to the input and output voltage ratio of the transformer, E t Depending on the selected material and coil structure, B m It is determined by the material and saturation point of the core, and the other values ​​are existing ones.

[0115] The whole process involves a lot of calculations and domain knowledge, and the ultimate goal is to find a balance between cost, efficiency, and reliability to meet specific technical requirements and market demands.

[0116] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to several modifications still falling within the scope of the appended claims.

[0117] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0118] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0119] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for establishing parameters of a transformer that can adapt to multiple products, characterized by: include, Analyze the existing parameter model and provide the parallel operation conditions; Formulate spare parts grade standards based on parallel operation conditions and provide optimization intervals; Determine the parameter range and set value based on the energy efficiency ratio and safety of the optimization range.

2. The method for establishing parameters of a multi-product adaptable transformer according to claim 1, characterized in that: The adapted 220KV flexible power transformer uses the rated capacitance, rated voltage, impedance voltage, and connection group related values ​​as the existing parameter model; The parallel operation conditions include: The voltage ratio is the same, with a tolerance of ±0.5%; Impedance voltage value difference <±10%; The wiring groups are the same; The transformer capacitance ratio shall not exceed 3:

1.

3. The method for establishing parameters of a multi-product adaptable transformer according to claim 2, characterized in that: The spare parts parameter model is determined based on the parallel operation conditions, and the optimization interval is determined as: The core part, the insulation part of the body, and the coil part; Determine the core structure and effective parameter settings; Determine the insulation material and coil connection method; Determine the coil winding structure and the number of turns of the voltage regulating coil.

4. The method for establishing parameters of a multi-product adaptable transformer according to claim 2 or 3, characterized in that: In the existing parameter model, Rated capacity (MVA): 150 / 150 / 75, 180 / 180 / 60, 180 / 180 / 90, 240 / 240 / 80, 240 / 240 / 120; Rated voltage (kV): 220 (230) ± 8 × 1.25% / 115 (121) / 10.5 (11), 220 (230) ± 8 × 1.25% / 115 (121) / 36 (38.5); Impedance voltage (%): 14 / 35 / 50, 14 / 21 / 35; Impedance voltage (%): 14 / 35 / 50, 14 / 21 / 35; Connection groups: YNyn0d11, YNyn0yn0+d.

5. The method for establishing parameters of a multi-product adaptable transformer according to claim 4, characterized in that: Based on the existing parameter model and combined with the parallel operation conditions, the parameter model of the standby transformer is given as follows: Rated voltage: 230±12×1.25% / 121±2×2.5% / 11+38.5kV; Rated capacity: 165 / 165 / 82.5+82.5MVA; Impedance voltage: 14% / 50% / 35% or 14% / 35% / 21%; Connection group: YNyn0yn0+d11; It can be determined that the spare transformer is three-phase three-winding with a frequency of 50Hz.

6. The method for establishing parameters of a multi-product adaptable transformer according to claim 5, characterized in that: According to the parameters of the spare transformer, the core is determined to be three-phase five-column with six-stepping; Collect winding information and substitute it into the formula to calculate the core size parameters; The calculated results are adjusted based on the empirical coefficient and compared with the standardized dimensions; After comparison, feasible options are determined, and other core parameters are further calculated. The above steps are repeated using the existing parameters to determine other core values ​​one by one.

7. The method for establishing parameters of a multi-product adaptable transformer according to claim 2 or 6, characterized in that: Based on the adapted 220KV flexible power transformer category, it is determined that the spare parts are equipped with coils of both 10KV and 35KV voltage levels; The coil connection method has the ability to realize the YNyn0d11 connection method; The coil arrangement order from the core to the outside is: voltage stabilizer - low voltage - medium voltage - high voltage - voltage regulator. The voltage stabilizer coil absorbs external high-frequency interference signals, protects low-voltage and medium-voltage coils, and assists in heat dissipation. The overall suit structure is adopted to reduce the air gap and reduce the unevenness of the electric field strength.

8. The method for establishing parameters of a multi-product adaptable transformer according to claim 7, characterized in that: Select the coil type according to the expected output voltage of the coil, and substitute it into the formula to calculate the turn potential and number of turns; The low voltage coil adopts a spiral structure; The medium voltage coil adopts a continuous structure; The high voltage coil adopts an inner screen continuous structure; According to E t =4.44×f×B m ×S zh , Among them, U ph is the phase voltage, E t is the potential per turn, f is the rated frequency 50Hz, B m Take 1.73T and S for the magnetic flux density. zh is the effective cross-sectional area of ​​the core column, N t is the number of coil turns.

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