Substation Main Equipment Status Evaluation Method, Device, Electronic Equipment and Storage Medium

Abstract

The present invention provides a method, device, electronic device and storage medium for evaluating the state of main substation equipment. The method includes the following steps: for multiple single state variables in a defect mode, obtain the measured values of the single state variables, and obtain the severity values of the single state variables according to the measured values; combine the severity values of the multiple single state variables to obtain the comprehensive criticality of a defect mode; based on the series relationship of each defect mode and according to the comprehensive criticality of the defect mode, obtain the deterioration degree of the component; for the deterioration degree of each component, select the evaluation result output by the component with the most serious deterioration degree as the final evaluation result of the equipment; output the maintenance level according to the final evaluation result and give the corresponding maintenance decision. The present invention performs state evaluation step by step according to the levels of defect evaluation, component evaluation, and equipment evaluation, improves the efficiency of equipment state evaluation, reduces the influence of human subjective factors, and provides auxiliary maintenance decisions according to the equipment evaluation results.

Description

Technical Field

[0001] The present invention relates to the technical field of operation monitoring of power equipment, and in particular, to a method, device, electronic device and storage medium for evaluating the state of main substation equipment. Background Art

[0002] With the gradual increase in the scale of the power grid and the elevation of the voltage level, the safe and reliable operation of the power system has become increasingly important, and the requirements for the operation quality of the substation equipment in the power system have also become higher and higher. Therefore, it is necessary to effectively evaluate the operation state of the substation equipment.

[0003] Currently, the existing methods for evaluating the state of main substation equipment mainly include: a scoring-based evaluation based on the evaluation guidelines of the State Grid Corporation. Although this method considers comprehensive factors, it has low efficiency, is limited by the professional level of the evaluator, and is easily affected by subjective factors, resulting in low accuracy of state evaluation. Summary of the Invention

[0004] In view of the above problems, the present invention provides a method, device, electronic device and storage medium for evaluating the state of main substation equipment.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is:

[0006] In a first aspect, the present invention discloses a method for evaluating the state of main substation equipment, including the following steps: for multiple single state quantities under a defect mode, obtaining the measurement values of the single state quantities by using a detection device, and obtaining the severity values of the single state quantities according to the measurement values; combining the severity values of the multiple single state quantities to obtain the comprehensive criticality of a defect mode; based on the series relationship of each defect mode and according to the comprehensive criticality of the defect mode, obtaining the degradation degree of the component; for the degradation degree of each component, selecting the evaluation result output by the component with the most serious degradation degree as the final evaluation result of the equipment; outputting the maintenance level according to the final evaluation result and giving the corresponding maintenance decision.

[0007] As a preferred solution, the obtaining the severity value of the single state quantity according to the measurement value includes: dividing the measurement value by a specified value to obtain a ratio, and then mapping the ratio to [0,1], where the specified value is the set value in the relevant regulations.

[0008] As a preferred solution, the calculation formula for the comprehensive criticality of a defect mode is:

[0009]

[0010] In the above formula, C mis the comprehensive criticality of the m-th defect mode. i, j, and k are the i-th, j-th, and k-th single state variables among n single state variables respectively, where n is the number of single state variables, and c i , c j , c k are the severity values of the i-th, j-th, and k-th single state variables respectively.

[0011] As a preferred solution, the calculation formula for the deterioration degree of the component is:

[0012]

[0013] In the above formula, C Ci is the deterioration degree of the component, m is the m-th defect mode among x defect modes, C m is the comprehensive criticality of the m-th defect mode, and x is the number of defect modes.

[0014] As a preferred solution, let the value of the component with the most severe deterioration degree be Harmgrade, then the evaluation result is as follows:

[0015]

[0016] In a second aspect, the present invention discloses a state evaluation device for main substation equipment, including: a state variable evaluation module, configured to obtain the measured values of the single state variables for a plurality of single state variables under a defect mode by using a detection device, and obtain the severity values of the single state variables according to the measured values; a defect evaluation module, configured to obtain the comprehensive criticality of a defect mode by combining the severity values of the plurality of single state variables; a component evaluation module, configured to obtain the deterioration degree of the component based on the series relationship of each defect mode and according to the comprehensive criticality of the defect mode; an equipment evaluation module, configured to select the evaluation result output by the component with the most severe deterioration degree as the final evaluation result of the equipment for the deterioration degrees of each component; a level and decision output module, configured to output the maintenance level according to the final evaluation result and give the corresponding maintenance decision.

[0017] In a third aspect, the present invention discloses an electronic device, where the electronic device includes a memory and a processor, the memory stores a computer program, and when the processor executes the computer program, the steps of the method described in any one of the above are implemented.

[0018] In a fourth aspect, the present invention discloses a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the steps of the method described in any one of the above are implemented.

[0019] Compared with the prior art, the beneficial effects of the present invention include: performing status evaluation step by step at the levels of defect evaluation, component evaluation, and equipment evaluation, comprehensively reflecting the comprehensive criticality of defects onto components through process-based evaluation, and then reflecting the comprehensive deterioration degree of components onto equipment, ultimately realizing the status evaluation of equipment, improving the efficiency of equipment status evaluation, overcoming the influence of subjective human factors, having high accuracy, and providing auxiliary maintenance decision-making based on the equipment evaluation results, with a high degree of intelligence. Description of the Drawings

[0020] The disclosure of the present invention will be described with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings, the same reference numerals are used to refer to the same components. Among them:

[0021] Figure 1 is a schematic flow diagram of the substation main equipment status evaluation method according to an embodiment of the present invention;

[0022] Figure 2 is a schematic structural diagram of the substation main equipment status evaluation device according to an embodiment of the present invention. Detailed Embodiments

[0023] It is easy to understand that according to the technical solution of the present invention, without changing the essence of the present invention, those of ordinary skill in the art can propose various interchangeable structural ways and implementation manners. Therefore, the following detailed embodiments and the accompanying drawings are only exemplary descriptions of the technical solution of the present invention and should not be regarded as the whole of the present invention or as a limitation or restriction on the technical solution of the present invention.

[0024] According to an embodiment of the present invention in combination with Figure 1 is shown. The present invention discloses a substation main equipment status evaluation method, including the following steps:

[0025] S101, for multiple single status quantities under a defect mode, use a detection device to obtain the measurement values of the single status quantities, and obtain the severity values of the single status quantities according to the measurement values.

[0026] Among them, obtaining the severity value of a single status quantity according to the measurement value includes: dividing the measurement value by a specified value to obtain a ratio, and then mapping the ratio to the [0,1] interval. This mapping rule is prior art and not universal, and the mapping rules for each defect and corresponding data are different. The specified value is the set value in the relevant regulations.

[0027] For example: when the transformer is in the defect mode of moisture ingress in the insulating oil, the single state variables in this mode are micro - water detection and oil chromatographic analysis. The oil chromatographic analysis values are usually the contents of various gases such as hydrogen, methane, ethane, ethylene, acetylene, carbon monoxide, and carbon dioxide. Assuming that the measured value of the micro - water content is a and the measured value of hydrogen in the oil chromatographic analysis is b (the contents of other gases are normal), and their specified values are a0 and b0 respectively, then their ratios are a / a0 and b / b0. Map the ratios to [0, 1], and the mapped values are the severity values of the micro - water detection and oil chromatographic analysis.

[0028] S102. Combine the severity values of multiple single state variables to obtain the comprehensive criticality of a defect mode.

[0029] The comprehensive criticality assessment of a defect mode is comprehensively characterized by one or more single state variables. For the state variables, closely combined with practical application experience and existing regulations and standards, etc., comprehensively consider the evaluation criteria in aspects such as quantity value, trend, and difference, and establish a comprehensive criticality calculation formula for scientific and reasonable evaluation.

[0030] The comprehensive criticality calculation formula for a defect mode is:

[0031]

[0032] In the above formula, C m is the comprehensive criticality of the m - th defect mode, i, j, k are the i - th, j - th, and k - th single state variables among n single state variables respectively, n is the number of single state variables, c i , c j , c k are the severity values of the i - th, j - th, and k - th single state variables respectively.

[0033] For example: when the transformer is in the defect mode of moisture ingress in the insulating oil, the single state variables in this mode are micro - water detection and oil chromatographic analysis, and their severity values are c1 and c2 respectively, then C m =(c1 + c2)+(-1) 2-1 (c1c2).

[0034] If a defect mode is characterized by three single state variables, and their severity values are c1, c2, c3 respectively, then C m =(c1 + c2 + c3)+(-1) 2-1 (c1c2 + c1c3 + c2c3)+(-1) 3-1 (c1c2c3); and so on.

[0035] S103. Based on the series relationship of each defect mode and according to the comprehensive criticality of the defect mode, obtain the degradation degree of the component.

[0036] If any one of the defect modes occurs in a certain component of the device, then the component is in a defective state. There is a series relationship among the defect modes of the same component. Thus, the relationship between the deterioration degree of the component and the comprehensive criticality of each defect mode can be obtained.

[0037] The formula for calculating the deterioration degree of the component is:

[0038]

[0039] In the above formula, C Ci is the deterioration degree of the component, m is the m-th defect mode among x defect modes, C m is the comprehensive criticality of the m-th defect mode, and x is the number of defect modes.

[0040] For example, for the insulating oil component of a transformer, the moisture ingress defect affects the deterioration of the transformer insulating oil, and its comprehensive criticality is set as C1; the discharge defect affects the deterioration of the transformer insulating oil, and the severity is C2. Then Cci = 1 - (1 - C1)(1 - C2).

[0041] S104. For the deterioration degrees of each component, select the evaluation result output by the component with the most serious deterioration degree as the final evaluation result of the device.

[0042] The evaluation result of the device depends on the evaluation results of the components. During the research process, it is found that the deterioration degrees of each component have no cross-influence on the overall evaluation result of the device. Therefore, referring to the regulations, select the evaluation result of the component with the most serious deterioration degree as the final evaluation result of the device.

[0043] S105. Output the maintenance level according to the final evaluation result and give the corresponding maintenance decision.

[0044] Let the value of the component with the most serious deterioration degree be Harmgrade. Then the evaluation result of the device is as follows:

[0045]

[0046] In the embodiments of the present invention, the maintenance levels include four categories: A, B, C, and D, and the urgency of their maintenance decreases gradually.

[0047] For example, the evaluation result of the transformer is abnormal, and according to the off-line oil chromatographic data analysis, it is found that the acetylene content exceeds the standard and the growth rate is relatively fast, indicating that there is a discharge defect in the transformer. Therefore, according to whether the detection sensor is abnormal, the system gives the maintenance levels of category B and category D.

[0048] When the detection sensor is normal, the maintenance level output is Class B, and the corresponding maintenance decisions are: (1) Long-term induced withstand voltage with partial discharge detection; (2) DC resistance detection; (3) Winding insulation resistance detection; (4) Core insulation resistance detection; (5) Leakage inspection of on-load tap-changer oil tank.

[0049] When the detection sensor is abnormal, the maintenance level output is Class D, and the corresponding maintenance decisions are: Check the accuracy of oil chromatogram data, closely monitor the operation status of the transformer, and arrange the detection items in the following order: (1) Ultrasonic, high-frequency, and UHF partial discharge detection; (2) Mechanical vibration detection; (3) Live measurement of core grounding current.

[0050] See Figure 2 , the present invention discloses a substation main equipment status evaluation device, including:

[0051] The status quantity evaluation module 101 is used to obtain the measured values of single status quantities for multiple single status quantities under a defect mode by using detection devices, and obtain the severity values of single status quantities according to the measured values.

[0052] The defect evaluation module 102 is used to combine the severity values of multiple single status quantities to obtain the comprehensive criticality of a defect mode.

[0053] The component evaluation module 103 is used to obtain the degradation degree of the component based on the series relationship of each defect mode and according to the comprehensive criticality of the defect mode.

[0054] The equipment evaluation module 104 is used to select the evaluation result output by the component with the most serious degradation degree as the final evaluation result of the equipment for the degradation degrees of each component.

[0055] The level and decision output module 105 is used to output the maintenance level according to the final evaluation result and give the corresponding maintenance decision.

[0056] Those skilled in the art can clearly understand that for the sake of convenience and conciseness of description, the specific working processes of the above-described systems, devices, and units can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein.

[0057] The present invention also discloses an electronic device, which includes a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, the steps of any one of the above methods are implemented.

[0058] The present invention also discloses a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the steps of any one of the above methods are implemented.

[0059] In summary, the beneficial effects of the present invention include: performing status evaluation step by step according to the levels of defect evaluation, component evaluation, and equipment evaluation. Through the process-based evaluation, the comprehensive criticality of defects is comprehensively reflected on components, and then the comprehensive deterioration degree of components is reflected on equipment, ultimately realizing the status evaluation of equipment, improving the efficiency of equipment status evaluation, overcoming the influence of human subjective factors, having high accuracy, and providing auxiliary maintenance decisions based on the equipment evaluation results, with a high degree of intelligence.

[0060] The technical scope of the present invention is not limited to the content described above. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. A method for evaluating the state of main substation equipment, characterized in that, Including the following steps: For multiple single state variables under a defect mode, use a detection device to obtain the measured values of the single state variables, and obtain the severity values of the single state variables according to the measured values; Combine the severity values of the multiple single state variables to obtain the comprehensive criticality of a defect mode; the calculation formula for the comprehensive criticality of a defect mode is: In the above formula, C m is the comprehensive criticality of the m-th defect mode, where i, j, and k are the i-th, j-th, and k-th single state variables among n single state variables, n is the number of single state variables, and c i , c j , and c k are the severity values of the i-th, j-th, and k-th single state variables respectively; Based on the series relationship of each defect mode, and according to the comprehensive criticality of the defect mode, obtain the deterioration degree of the component; For the deterioration degrees of each component, select the evaluation result output by the component with the most serious deterioration degree as the final evaluation result of the equipment; Output the maintenance level according to the final evaluation result, and give the corresponding maintenance decision.

2. The method for evaluating the state of the main power transformation equipment according to claim 1, wherein The obtaining of the severity value of the single state variable according to the measured value includes: dividing the measured value by a specified value to obtain a ratio, and then mapping the ratio to [0, 1], where the specified value is the set value in the relevant regulations.

3. The power transformation main equipment state evaluation method according to claim 1, characterized in that The calculation formula for the deterioration degree of the component is: In the above formula, C Ci is the degradation degree of the component, m is the m-th defect mode among x defect modes, and C m is the comprehensive criticality of the m-th defect mode, and x is the number of defect modes.

4. The method for evaluating the state of the main power transformation equipment according to claim 1, characterized in that Let the value of the component with the most serious deterioration degree be Harmgrade, then the evaluation result is as follows:

5. A main substation equipment status evaluation device, characterized in that, Including: A state variable evaluation module for, for multiple single state variables under a defect mode, using a detection device to obtain the measured values of the single state variables, and obtaining the severity values of the single state variables according to the measured values; A defect evaluation module for combining the severity values of the multiple single state variables to obtain the comprehensive criticality of a defect mode; the calculation formula for the comprehensive criticality of a defect mode is: In the above formula, C m is the comprehensive criticality of the m-th defect mode. i, j, and k are the i-th, j-th, and k-th single state variables among the n single state variables respectively, where n is the number of single state variables. c i , c j , and c k are the severity values of the i-th, j-th, and k-th single state variables respectively; A component evaluation module for, based on the series relationship of each defect mode, and according to the comprehensive criticality of the defect mode, obtaining the deterioration degree of the component; An equipment evaluation module for, for the deterioration degrees of each component, selecting the evaluation result output by the component with the most serious deterioration degree as the final evaluation result of the equipment; A level and decision output module for outputting the maintenance level according to the final evaluation result, and giving the corresponding maintenance decision.

6. An electronic device, characterized in that, The electronic device includes a memory and a processor, the memory stores a computer program, and when the processor executes the computer program, the steps of the method according to any one of claims 1-4 are implemented.

7. A computer-readable storage medium, characterized in that, Stores a computer program, and when the computer program is executed by the processor, the steps of the method according to any one of claims 1-4 are implemented.

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