Electrical equipment component supply chain reliability grade determination method

Abstract

The invention discloses an electrical equipment component supply chain reliability grade judgment method. The safety reliability grade of a total reliability value of electrical equipment is obtained through five steps. According to the electrical equipment component supply chain reliability grade determination method, the defects of an existing supply chain reliability analysis method are overcome, and the chain tree-shaped supply chain model of the electrical equipment component is provided by combining actual conditions. On the basis of the supply chain model, according to a risk analysis theory, key risks influencing safety and reliability of the electrical equipment supply chain are identified, and a reliability calculation method for the complete supply chain of the electrical equipment is provided. And finally, according to a user expectation level, defining a corresponding relation between a reliability quantitative value and a reliability level, and giving a reasonable judgment on a safety and reliability level of the electrical equipment component supply chain, and in the whole process, the standardization of steps in the evaluation process is stipulated through a strict quality assurance system, and the data preciseness and the calculation accuracy are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of supply chain, and in particular to a method for determining the reliability level of an electrical equipment component supply chain. Background Art

[0002] With the advancement of economic globalization and the intensification of market competition, electrical equipment manufacturers are no longer limited to local or domestic markets, but are looking for the most cost-effective raw material supply sources around the world based on factors such as cost, quality, and supply chain security and reliability. As the basis of electrical equipment manufacturing, the reliability of the supply chain of electronic components directly affects the quality and production efficiency of the final product, and has become the focus of attention of manufacturing companies. The reliability of the supply chain is affected by various potential risks, which may come from various uncertainties within the supply chain, such as manufacturer bankruptcy, logistics disruptions, product quality problems, etc., or from changes in the external environment, such as political turmoil, natural disasters, economic fluctuations, etc. These risks may not only have a direct impact on the operation of the enterprise, but may even threaten the survival of the enterprise. In recent years, economic globalization has encountered headwinds, trade protectionism and geopolitical games have continued to intensify, profoundly changing the global industrial chain supply chain pattern. The industrial supply chains of various countries have begun to shift from focusing on cost, efficiency, and technology to focusing on safety, stability and politics. As an important industry related to national energy security, the electrical equipment manufacturing industry is the first to bear the brunt.

[0003] In view of the changes in the current international situation, there is no unified method and standard for how to assess the safety and reliability level of the electrical equipment component supply chain among power users, manufacturers and testing institutions. Most of the existing research results are supply chain reliability studies based on risk analysis methods, which are basically more theoretical than practical and cannot provide a good guide for evaluation work.

[0004] The existing supply chain reliability risk analysis method has the following disadvantages: 1. The supply chain model is not accurate enough. The existing supply chain model simply uses the series or parallel model to solve the supply chain reliability, and cannot reasonably use the model in combination with the analysis of actual problems, such as the model to solve the supply chain structure problem containing different types of nodes. 2. There is a lack of calculation methods for the reliability of supply chain nodes. The reliability of supply chain nodes is not constant, but a value calculated by combining various risk factors. The existing method does not give the calculation process of the node, and the calculation using the estimated constant reliability value is not scientific enough. 3. The identified risks do not meet the needs of determining the safety and reliability of the electrical equipment supply chain. There are many risks that affect the reliability of the supply chain. The supply chain reliability risks identified by the existing method may be funds, technology, information, personnel, products and services, etc. These risks are not key risks for determining the safety and reliability of the supply chain. 4. There is a lack of basis for determining the safety and reliability level of the supply chain. The existing supply chain reliability quantitative analysis method only calculates the supply chain reliability value, which cannot reflect the reliability level of the supply chain, and lacks the corresponding relationship between the reliability value and the reliability level. 5. There is a lack of quality assurance system for reliability analysis. The probability of risk occurrence involved in reliability calculation is the key data that affects the reliability level of the supply chain. The accuracy of the probability value needs to be ensured through a complete quality assurance system. The existing methods focus on the reliability calculation process and ignore the accuracy of data elements, and lack a quality assurance system for the accuracy of data elements.

[0005] Therefore, in view of the shortcomings of the existing technology, it is necessary to provide a method for determining the reliability level of the electrical equipment component supply chain to solve the shortcomings of the existing technology. Summary of the invention

[0006] The present invention aims to avoid the shortcomings of the prior art and provide a method for determining the reliability level of an electrical equipment component supply chain. The reliability level determination of the method for determining the reliability level of an electrical equipment component supply chain has good standardization, rigor and accuracy.

[0007] The above-mentioned purpose of the present invention is achieved by the following technical measures:

[0008] A method for determining the reliability level of a supply chain of electrical equipment components is provided, which is performed in the following steps:

[0009] S1. In electrical equipment, all components are classified according to their importance to obtain multiple components of the same type;

[0010] S2, build the supply chain model of each similar component separately;

[0011] S3. Calculate the reliability value of each node in each supply chain model respectively, and then obtain the total reliability value of the corresponding supply chain model according to the reliability value of each node, where the reliability value of the node is composed of the probability of no failure of the indicator element and the weight of the indicator element;

[0012] S4. Obtaining a total reliability value of the electrical equipment according to the total reliability values ​​of all supply chain models and the weights corresponding to the supply chain models;

[0013] S5. In a pre-constructed reliability level and reliability correspondence table, search for the reliability level corresponding to the total reliability value of the electrical equipment to obtain the safety reliability level of the total reliability value of the electrical equipment.

[0014] At least one component of the same kind is provided in each component of the same type, and there is at least one supplier of each component of the same kind.

[0015] The number of components of the same type in each component of the same type is defined as M, which are defined as r1, ..., r i ,……,r M , there exists 1≤i≤M.

[0016] Define the number of suppliers of each component as N, and define them as r i1 ,……,r ij ,……,r iN , there exists 1≤j≤N.

[0017] In S2, the supply chain model building method for each similar component is performed by the following steps:

[0018] S2.1. Each supplier of the same component constitutes a separate node;

[0019] S2.2. Arrange all components of the same type in order from front to back;

[0020] S2.3, all nodes of the same type of components are regarded as nodes of the same level, and the nodes of the same level are arranged in order from top to bottom;

[0021] S2.4. All nodes in the same level are connected in parallel, and all nodes in the same level are connected in series with all nodes in adjacent nodes in the same level to obtain the supply chain model.

[0022] Preferably, the above S3 is performed by the following steps:

[0023] S3.1. Calculate the reliability value of each node according to the indicator elements of each node in the supply chain model and the weights corresponding to the indicator elements;

[0024] S3.2, according to the reliability values ​​of all nodes in the same kind of components, obtain the reliability value of the same kind of components;

[0025] S3.3. Based on the reliability value of each component of the same type, the total reliability value of the supply chain model is obtained.

[0026] In S3.1, the reliability value of each node is obtained by formula (1):

[0027]

[0028] Among them, r is the reliability value of the node, Q is the total number of indicator elements of the node, and w k is the weight of the kth index element, p k is the probability that the kth indicator element does not fail.

[0029] In S3.2, the reliability value of the same type of components is obtained by formula (2):

[0030]

[0031] Among them, r i is the reliability value of the i-th component of the same type, r ij Reliability value of the jth supplier of the i-th component.

[0032] In S3.3, the total model reliability value R of the supply chain model is obtained by formula (3):

[0033]

[0034] Preferably, the above-mentioned similar components are key components, important components and general components.

[0035] Preferably, the above supply chain model is provided with a key supply chain model, an important supply chain model and a general supply chain model.

[0036] Preferably, the above-mentioned model reliability values ​​are provided with key reliability values ​​corresponding to key supply chain models, important reliability values ​​corresponding to important supply chain models, and general reliability values ​​corresponding to general supply chain models.

[0037] The total reliability value T of the electrical equipment is obtained by formula (4):

[0038] T = R1×D1+R2×D2+R3×D3…Formula (4);

[0039] Among them, R1 is the total model reliability value of the key supply chain model, and D1 is the weight of the key supply chain model; R2 is the total model reliability value of the important supply chain model, and D2 is the weight of the important supply chain model; R3 is the total model reliability value of the general supply chain model, and D3 is the weight of the general supply chain model.

[0040] Preferably, the above reliability level and reliability correspondence table consists of reliability levels and total reliability values, and different reliability levels correspond to different total reliability value ranges.

[0041] Preferably, the above-mentioned indicator elements are at least one of the supplier's enterprise scale, the supplier's enterprise nature, the supplier's operating conditions, the supplier's credibility level, the supplier's personnel composition, the supplier's technical strength, the supplier's delivery timeliness or the reliability of the supplier's affiliated enterprises.

[0042] The present invention discloses a method for determining the reliability level of a supply chain of electrical equipment components, which is carried out by the following steps: S1, classifying all components in the electrical equipment according to the importance of the components to obtain a plurality of similar components; S2, constructing a supply chain model for each similar component respectively; S3, calculating the reliability value of each node in each supply chain model respectively, and then obtaining the total model reliability value of the corresponding supply chain model according to the reliability value of each node, wherein the reliability value of the node is composed of the probability of non-failure of the indicator element and the weight of the indicator element; S4, obtaining the total reliability value of the electrical equipment according to the total model reliability value of all supply chain models and the weight corresponding to the supply chain model; S5, searching the reliability level corresponding to the total reliability value of the electrical equipment in a pre-constructed reliability level and reliability correspondence table, and obtaining the safety reliability level of the total reliability value of the electrical equipment. The method for determining the reliability level of the supply chain of electrical equipment components makes up for the shortcomings of the existing supply chain reliability analysis method, and proposes a chain tree supply chain model of electrical equipment components in combination with actual conditions. On the basis of the supply chain model, according to the risk analysis theory, the key risks affecting the safety and reliability of the electrical equipment supply chain are identified, and a reliability calculation method for the complete supply chain of electrical equipment is given. Finally, based on the user's expectation level, the corresponding relationship between the quantitative reliability value and the reliability level is defined, and a reasonable judgment of the safety and reliability level of the electrical equipment component supply chain is given. The entire process is standardized through a strict quality assurance system to ensure the rigor of the data and the accuracy of the calculation. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The present invention is further described with reference to the accompanying drawings, but the contents in the accompanying drawings do not constitute any limitation to the present invention.

[0044] Figure 1 This is a supply chain model diagram.

[0045] Figure 2 This is a tree diagram of the electrical equipment in Example 2.

[0046] Figure 3 Schematic diagram of each supply chain model in Example 2.

[0047] Figure 4 These are diagrams of the various supply chain models used in Example 2. DETAILED DESCRIPTION

[0048] The technical solution of the present invention is further described in conjunction with the following embodiments.

[0049] Example 1

[0050] A method for determining the reliability level of an electrical equipment component supply chain is performed by the following steps:

[0051] S1. In electrical equipment, all components are classified according to their importance to obtain multiple components of the same type;

[0052] S2, build the supply chain model of each similar component separately;

[0053] S3. Calculate the reliability value of each node in each supply chain model respectively, and then obtain the total reliability value of the corresponding supply chain model according to the reliability value of each node, where the reliability value of the node is composed of the probability of no failure of the indicator element and the weight of the indicator element;

[0054] S4. Obtaining a total reliability value of the electrical equipment according to the total reliability values ​​of all supply chain models and the weights corresponding to the supply chain models;

[0055] S5. In a pre-constructed reliability level and reliability correspondence table, find the reliability level corresponding to the total reliability value of the electrical equipment to obtain the safety reliability level of the total reliability value of the electrical equipment.

[0056] It should be noted that the importance classification of S1 of the present invention is specifically classified according to the importance of components in electrical equipment, and the number of classifications is determined according to actual conditions, and can be two, three, four, etc.

[0057] At least one component of the same kind is provided in each component of the same kind, and there is at least one supplier of each component of the same kind. The number of components of the same kind in each component of the same kind is defined as M, which are defined as r1, ..., r i ,……,r M , there exists 1≤i≤M. Define the number of suppliers of each type of component as N, and define them as r i1 、……、r ij 、……、r iN, there exists 1≤j≤N.

[0058] In S2, the supply chain model construction method for each similar component is carried out by the following steps:

[0059] S2.1. Each supplier of the same component constitutes a separate node;

[0060] S2.2. Arrange all components of the same type in order from front to back;

[0061] S2.3, all nodes of the same type of components are regarded as nodes of the same level, and the nodes of the same level are arranged in order from top to bottom;

[0062] S2.4, all nodes in the same level nodes are connected in parallel, and all nodes in the same level nodes are connected in series with all nodes in the adjacent same level nodes to obtain the supply chain model, such as Figure 1 .

[0063] It should be noted that in Figure 1 The same column represents the same type of components, all nodes in the same column are peer nodes, and each node represents a supplier. Figure 1 There are M components of the same kind, which are arranged from front to back; the nodes of the same level of each component of the same kind are arranged from top to bottom. Taking the second column as an example, the nodes of the second column are 21, 22, ..., 2N, among which 21, 22, ..., 2N are connected in parallel, and then 21 is connected in series with 11, 12, ..., 1N in the previous component of the same kind; 21 is also connected in series with 31, 32, ..., 3N in the next component of the same kind; the same is true for 22, ..., 2N.

[0064] S3 is performed by the following steps:

[0065] S3.1. Calculate the reliability value of each node based on the indicator elements of each node in the supply chain model and the weights corresponding to the indicator elements;

[0066] S3.2, according to the reliability values ​​of all nodes in the same kind of components, obtain the reliability value of the same kind of components;

[0067] S3.3. Based on the reliability value of each component of the same type, the total reliability value of the supply chain model is obtained.

[0068] In S3.1, the reliability value of each node is obtained by formula (1):

[0069]

[0070] Among them, r is the reliability value of the node, Q is the total number of indicator elements of the node, and w k is the weight of the kth index element, pk is the probability that the kth indicator element does not fail.

[0071] In S3.2, the reliability value of the same type of components is obtained by formula (2):

[0072]

[0073] Among them, r i is the reliability value of the i-th component of the same type, r ij Reliability value of the jth supplier of the i-th component.

[0074] In S3.3, the total model reliability value R of the supply chain model is obtained by formula (3):

[0075]

[0076] The reliability level and reliability correspondence table consists of reliability levels and total reliability values, and different reliability levels correspond to different total reliability value ranges.

[0077] The index elements are at least one of the supplier's enterprise scale, the supplier's enterprise nature, the supplier's operating conditions, the supplier's credibility level, the supplier's personnel composition, the supplier's technical strength, the supplier's delivery timeliness or the reliability of the supplier's affiliated enterprises.

[0078] It should be noted that the indicator elements in the supplier of the present invention also need to pass a strict quality assurance system to review the data source to ensure the rigor of the supply chain security reliability rating and the accuracy of the data calculation, as follows:

[0079] First, regarding the preparatory conditions:

[0080] Electrical equipment manufacturers provide the following review materials: 1. A list of electrical equipment components, marking the importance of each component, the name of the manufacturer, and the nature of the manufacturer; 2. Component manufacturer corporate qualification materials, including: corporate qualification query website query results, business license; 3. Photos of the internal structure of electronic and electrical products, which can identify the locations of key and important components; 4. Physical key components and corresponding technical manuals.

[0081] Second, the determination steps:

[0082] 1. Review and verify the information submitted by the assessed unit;

[0083] 2. The components in the bill of materials should be sampled for testing and verification;

[0084] 3. Aggregate data and calculate supply chain reliability;

[0085] 4. Determination of supply chain reliability level.

[0086] Third, termination conditions:

[0087] If it is found during the determination process that the physical components of the electrical equipment do not match the bill of materials, the determination will be terminated.

[0088] This method for determining the reliability level of the electrical equipment component supply chain makes up for the shortcomings of the existing supply chain reliability analysis method, and proposes a chain tree supply chain model for electrical equipment components based on actual conditions. Based on the supply chain model, according to the risk analysis theory, the key risks that affect the safety and reliability of the electrical equipment supply chain are identified, and a reliability calculation method for the complete electrical equipment supply chain is given. Finally, according to the user's expected level, the corresponding relationship between the reliability quantitative value and the reliability level is defined, and a reasonable determination of the safety and reliability level of the electrical equipment component supply chain is given. The entire process stipulates the standardization of the evaluation process steps through a strict quality assurance system to ensure the rigor of the data and the accuracy of the calculation.

[0089] Example 2

[0090] A method for determining the reliability level of a supply chain of electrical equipment components, the other features of which are the same as those of Example 1, except that: in this embodiment, electrical equipment is divided into three categories according to the importance of components, namely, key category, important category and general category, and components of the same category are key components, important components and general components. The supply chain model is provided with a key supply chain model, an important supply chain model and a general supply chain model. The model reliability value is provided with a key reliability value corresponding to the key supply chain model, an important reliability value corresponding to the important supply chain model, and a general reliability value corresponding to the general supply chain model.

[0091] Components include main control chips, communication chips, power chips, diodes, transistors, capacitors, resistors, magnetic beads, relays, etc. According to the importance of components in the equipment (irreplaceability), components are divided into: key components, important components, and general components. The three components of different importance are used as three different branches of the electrical equipment supply chain, thus obtaining a tree-like supply chain of electrical equipment, such as Figure 2 , the supply chain model of the electrical equipment is as follows Figure 3 .

[0092] The total reliability value T of electrical equipment is obtained by formula (4):

[0093] T = R1×D1+R2×D2+R3×D3…Formula (4);

[0094] Among them, R1 is the total model reliability value of the key supply chain model, and D1 is the weight of the key supply chain model; R2 is the total model reliability value of the important supply chain model, and D2 is the weight of the important supply chain model; R3 is the total model reliability value of the general supply chain model, and D3 is the weight of the general supply chain model.

[0095] This embodiment also defines the weights corresponding to key components, important components, and general components according to Table 1:

[0096] Table 1 Component reliability influence weight table

[0097]

[0098] Then the total reliability value of the electrical equipment is as shown below:

[0099]

[0100] The above formula can also be simplified to T = R1×0.5+R2×0.3+R3×0.2.

[0101] At the same time, the reliability value of each node in 3.1 is simplified to 1 by the total number of indicator elements of the node in formula (1). The indicator element is only the manufacturer's nature, and the weight is 1, as shown in Tables 2 and 3.

[0102] Table 2 Manufacturer's probability of no failure

[0103]

[0104] Table 3 Reliability probability classification of manufacturers with different properties

[0105]

[0106] The bill of materials of the electrical equipment of this embodiment includes 9 components ABCDEFGHI in total, as shown in Table 4;

[0107] Table 4 Components Bill of Materials

[0108]

[0109] Note: The number indicates the level of the supply chain node. Multiple rows with the same number indicate that the supply chain node has multiple suppliers to choose from. Components with the same number have the same importance and the same plug-in, but different manufacturers; only one row has a quantity that cannot be 0, and the quantities of other spare components are all 0. Components that can be used at the same time and can replace each other are considered different supply chain nodes.

[0110] Based on Table 4, the key supply chain model, important supply chain model and general supply chain model of the electrical equipment are obtained as follows Figure 4. And the total reliability value of the electrical equipment is T = 0.5*0.5+1*0.3+0.5625*0.2 = 0.6625.

[0111] The corresponding relationship between the reliability level and the reliability of this embodiment is shown in Table 5:

[0112] Table 5 Reliability level and reliability correspondence table

[0113] Reliability level Total reliability value R Reliability A-level ≥0.9 Very high Class B [0.8,0.9) high C-Class [0.7,0.8) middle D-Class [0.6,0.7) Lower E-Class ＜0.6 Very low

[0114] According to the reliability level and reliability correspondence table in Table 5, the safety reliability level of the electrical equipment component supply chain is determined to be D, which means the reliability level is relatively low.

[0115] The method for determining the reliability level of the electrical equipment component supply chain designs a supply chain tree model and, based on a risk analysis method, accurately calculates the reliability value of the component supply chain and evaluates the safety reliability level of the supply chain. The present invention can be applied to manufacturing enterprises to determine and evaluate the safety reliability level of the electrical equipment manufacturing component supply chain, helping manufacturing enterprises to timely optimize and improve the procurement chain, avoid supply chain interruption risks, enhance user confidence in equipment quality, and bring economic benefits and brand benefits to manufacturing enterprises.

[0116] Example 3

[0117] A method for determining the reliability level of an electrical equipment component supply chain, other features of which are the same as those of Example 1, and further having the following features: the index elements are the supplier's enterprise scale, the supplier's enterprise nature, the supplier's operating conditions, the supplier's reputation level, the supplier's personnel composition, the supplier's technical strength, the supplier's delivery timeliness, and the reliability of the supplier's associated enterprises. The reliability evaluation matrix of the node is shown in Table 6:

[0118]

[0119] Compared with Example 2, the indicator elements of this embodiment are richer, so the evaluation of the reliability level is more accurate and objective.

[0120] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. 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 solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A method for determining the reliability level of an electrical equipment component supply chain, characterized in that: The following steps are performed: S1. In electrical equipment, all components are classified according to their importance to obtain multiple components of the same type; S2, build the supply chain model of each similar component separately; S3. Calculate the reliability value of each node in each supply chain model respectively, and then obtain the total reliability value of the corresponding supply chain model according to the reliability value of each node, where the reliability value of the node is composed of the probability of no failure of the indicator element and the weight of the indicator element; S4. Obtaining a total reliability value of the electrical equipment according to the total reliability values ​​of all supply chain models and the weights corresponding to the supply chain models; S5. In a pre-constructed reliability level and reliability correspondence table, search for the reliability level corresponding to the total reliability value of the electrical equipment to obtain the safety reliability level of the total reliability value of the electrical equipment.

2. The method for determining reliability level of electrical equipment component supply chain according to claim 1, characterized in that: At least one component of the same type is provided in each component of the same category, and there is at least one supplier of each component of the same category; The number of components of the same type in each component of the same type is defined as M, which are defined as r1, ..., r i ,……,r M , there exists 1≤i≤M; Define the number of suppliers of each component as N, and define them as r i1 ,……,r ij ,……,r iN , there exists 1≤j≤N.

3. The method for determining reliability level of electrical equipment component supply chain according to claim 2, characterized in that: In S2, the supply chain model building method for each similar component is performed by the following steps: S2.

1. Each supplier of the same component constitutes a separate node; S2.

2. Arrange all components of the same type in order from front to back; S2.3, all nodes of the same type of components are regarded as nodes of the same level, and the nodes of the same level are arranged in order from top to bottom; S2.

4. All nodes in the same level are connected in parallel, and all nodes in the same level are connected in series with all nodes in adjacent nodes in the same level to obtain the supply chain model.

4. The method for determining reliability level of electrical equipment component supply chain according to claim 2, characterized in that: The S3 is performed by the following steps: S3.

1. Calculate the reliability value of each node according to the indicator elements of each node in the supply chain model and the weights corresponding to the indicator elements; S3.2, according to the reliability values ​​of all nodes in the same kind of components, obtain the reliability value of the same kind of components; S3.

3. Based on the reliability value of each component of the same type, the total reliability value of the supply chain model is obtained.

5. The method for determining reliability level of electrical equipment component supply chain according to claim 4, characterized in that: In S3.1, the reliability value of each node is obtained by formula (1): Among them, r is the reliability value of the node, Q is the total number of indicator elements of the node, and w k is the weight of the kth index element, p k is the probability of no failure of the kth indicator element.

6. The method for determining reliability level of electrical equipment component supply chain according to claim 5, characterized in that: In S3.2, the reliability value of the same type of components is obtained by formula (2): Among them, r i is the reliability value of the i-th component of the same type, r ij Reliability value of the jth supplier of the i-th component.

7. The method for determining reliability level of electrical equipment component supply chain according to claim 6, characterized in that: In S3.3, the total model reliability value R of the supply chain model is obtained by formula (3):

8. The method for determining reliability level of electrical equipment component supply chain according to any one of claims 1 to 7, characterized in that: The components of the same type are key components, important components and general components; The supply chain model includes a key supply chain model, an important supply chain model and a general supply chain model; The model reliability values ​​are set with key reliability values ​​corresponding to key supply chain models, important reliability values ​​corresponding to important supply chain models, and general reliability values ​​corresponding to general supply chain models.

9. The method for determining reliability level of electrical equipment component supply chain according to claim 8, characterized in that: The total reliability value T of the electrical equipment is obtained by formula (4): T = R1×D1+R2×D2+R3×D3…Formula (4); Among them, R1 is the total model reliability value of the key supply chain model, and D1 is the weight of the key supply chain model; R2 is the total model reliability value of the important supply chain model, and D2 is the weight of the important supply chain model; R3 is the total model reliability value of the general supply chain model, and D3 is the weight of the general supply chain model.

10. The method for determining reliability level of electrical equipment component supply chain according to claim 3, characterized in that: The reliability level and reliability correspondence table is composed of reliability levels and total reliability values, and different reliability levels correspond to different total reliability value ranges; The indicator elements are at least one of the supplier's enterprise scale, the supplier's enterprise nature, the supplier's operating conditions, the supplier's credibility level, the supplier's personnel composition, the supplier's technical strength, the supplier's delivery timeliness, or the reliability of the supplier's affiliated enterprises.

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