Method for evaluating soundness of power facilities

Abstract

The present invention relates to a method for evaluating the soundness of power facilities, which is performed by means of a processor of a computing device, the method comprising: an input step of receiving evaluation items capable of evaluating the state of the power facilities; a classification step of classifying the evaluation items into condition evaluation items capable of checking a failure of the power facilities, deterioration evaluation items capable of checking a degree of deterioration of the power facilities, and strategic evaluation items selected by an operator; a strategic index determination step of processing the condition evaluation items to determine a condition index, processing the deterioration evaluation items to determine a deterioration index, and processing the strategic evaluation items to determine a strategic index; and a soundness index determination step of comparing the condition index, the deterioration index, and the strategic index, and determining an index having the lowest value as a final soundness index.

Description

Method for assessing the health of power facilities

[0001] The present invention relates to a composite health evaluation method for power equipment, and more specifically, to a health evaluation method capable of performing health evaluations of power equipment components or characteristic items from various angles.

[0002] In general, power facilities, including transmission and distribution facilities, are assessed for their current status and measures are taken through asset soundness assessments.

[0003] The items for evaluating asset soundness are called asset soundness indexes (health index) and are defined in CIGRE technical documents, etc.

[0004] Domestically, power facility maintenance is implemented through asset soundness assessments. In particular, the scope of transmission and distribution facilities is extremely broad. It is difficult to secure diagnostic and operational data for numerous distribution power facilities, including distribution transformers and circuit breakers. Furthermore, applying expensive diagnostic systems to transmission and distribution facilities is also challenging.

[0005] Conventionally, various health evaluation methods have been used according to needs, and the known health evaluation methods of conventional power equipment are explained as follows.

[0006] Figure 3 is a flowchart showing an example of a conventional method for evaluating the health of power equipment.

[0007] Figure 3 shows a simple score summation method, which calculates an evaluation grade for each evaluation item for each component of a power facility, assigns a health score for each evaluation grade, and then calculates a health index by adding these scores.

[0008] At this time, evaluation items can be various inspection / analysis data, such as statistical data on insulation, aging, and defect occurrence frequency, status data, and operational data. These include equipment age, equipment installation environment, exterior inspection items, and characteristic measurement items such as voltage and current.

[0009] For example, for a transformer, this may include power factor, load factor, and Dissolved Gas Analysis (DGA).

[0010] The evaluation grade is usually divided into five levels (very high, high, normal, low, very low), and the lower the evaluation grade level, the higher the probability of failure of the corresponding part.

[0011] The health score is given as 4, 3, 2, 1, or 0 depending on the evaluation grade.

[0012] Ultimately, a health score is calculated for each evaluation item and added up to determine a health index. However, this method can only check the overall health (condition) of the entire power facility, and has the limitation that it cannot tell whether there are items with low condition evaluation grades among the evaluation items, which are likely to fail if urgent action is not taken, using only the overall health index.

[0013] Figure 4 is an example of a conventional weighted score summation method.

[0014] Figure 4 has the feature of giving weight to the simple score summation method described through Figure 3.

[0015] The weight at this time is based on the importance of each evaluation item, and the more important the evaluation item, the higher the weight given.

[0016] The weights can be values ​​greater than or equal to 0 and less than 1, and a method can be used to set the sum of all weights to 1.

[0017] The weights are multiplied by the health score of each evaluation item, allowing for a more detailed assessment of the overall condition of power facilities compared to a simple score summation method.

[0018] However, even if the weighted score sum method is used, it still has the limitation of not being able to confirm whether there are items with low condition evaluation grades.

[0019] Figure 5 is an example of exponential score summation.

[0020] The indexed score sum method uses the health score of the simple score sum method to index it and calculate the overall health index as a sum.

[0021] The more unsound the power equipment, the higher the score is given.

[0022] For example, each evaluation item is divided into five evaluation grades: very good, good, average, bad, and very bad, and a soundness score of 0, 1, 2, 3, and 4 is given according to the evaluation grade.

[0023] The above health score becomes an exponent, and for example, if we assume that the base of the exponent score is 3, then 3 to the power of 0 (3 0 ), 3 to the power of 1 (3 1 ), 3 to the power of 2 (3 2 ), 3 to the power of 3 (3 3 ), 3 to the power of 4 (3 4 ) is expressed as a score, which makes the difference in the index score according to the soundness score larger, so that the soundness index can greatly reflect the influence of a very bad score among specific evaluation items of a specific part.

[0024] Therefore, even if only one item is evaluated as very bad, you can check whether it is included as very bad based on the health index alone.

[0025] However, it has the limitation of not being able to confirm the distribution of grades by evaluation item, so it is not possible to know whether emergency measures are needed for a specific evaluation item.

[0026] Figure 6 is an example of a conventional worst case evaluation method.

[0027] The lowest score evaluation method, unlike the previous examples, does not simply add up the soundness scores, but rather selects the lowest score among the soundness scores and determines it as the soundness index.

[0028] Therefore, although it has the advantage of being able to immediately identify power facilities requiring urgent action, it has the limitation of not being able to confirm the overall health of the power facilities, and it has the limitation of not being able to know how much the overall health of the facilities can be improved after repairs are made for evaluation items that are classified as very poor and require urgent action.

[0029] In this way, existing methods for assessing the health of power facilities each produce an individual health index, but they have the limitation that the information on the status of power facilities that can be obtained using the produced health index is limited.

[0030] The problem that the present invention seeks to solve in consideration of the problems of the prior art as described above is to provide a health evaluation method that can check the status of power equipment from various angles.

[0031] More specifically, the present invention aims to provide a method for evaluating the health of power facilities, which can confirm the overall health of power facilities, and also, if there is a problem with one of the specific parts or evaluation items of the power facilities, can identify the problem and determine whether emergency measures are required.

[0032] The method for evaluating the health of a power facility of the present invention is a method for evaluating the health of a power facility performed in a processor of a computing device, and may include an input step for receiving evaluation items capable of evaluating the state of a power facility, a classification step for classifying the evaluation items into condition evaluation items capable of checking a failure of a power facility, deterioration evaluation items capable of checking a degree of deterioration of a power facility, and strategic evaluation items selected by an operator, a strategic index determination step for processing condition evaluation items to determine a condition index, processing deterioration evaluation items to determine a deterioration index, and processing strategic evaluation items to determine a strategic index, and a health index determination step for comparing the condition index, deterioration index, and strategic index and determining an index having the lowest value as a final health index.

[0033] In an embodiment of the present invention, the condition index may be determined through a process of classifying the condition evaluation items into multiple evaluation grades, a process of assigning a health score according to the evaluation grades, and a condition index determination process of selectively determining a condition index that can check whether immediate action is necessary by checking the health score or a condition index that can check the status of the entire power facility.

[0034] In an embodiment of the present invention, the condition index determination process may include a process of checking whether a health score having an evaluation grade lower than average is included among the health scores, and, if a health score lower than average is included, a process of selecting the lowest health score and determining it as the condition index.

[0035] In an embodiment of the present invention, the condition index determination process may include a process of checking whether a health score having an evaluation grade lower than average is included among the health scores, and, if a health score lower than average is not included, a process of applying a weight to all health scores and determining the sum of the weighted health scores as the condition index.

[0036] In an embodiment of the present invention, the weight may be a value greater than or equal to 0 and less than 1, and the sum of the applied weights may be 1.

[0037] In an embodiment of the present invention, the deterioration index can be determined through a process of classifying deterioration evaluation items into multiple evaluation grades, a process of assigning a soundness score according to the evaluation grades, a process of applying a weight to the soundness scores, and a process of determining the sum of the weighted soundness scores as the deterioration index.

[0038] In an embodiment of the present invention, the weight may be a value greater than or equal to 0 and less than 1, and the sum of the applied weights may be 1.

[0039] In an embodiment of the present invention, the strategic index can be determined through a process of classifying strategic evaluation items into multiple evaluation grades and a process of assigning a soundness score according to the evaluation grades.

[0040] In an embodiment of the present invention, when there are multiple strategic evaluation items, the sum of the soundness receptions according to the evaluation grades can be determined as a strategic index.

[0041]

[0042] The present invention has the effect of enabling the overall health of power facilities to be confirmed and whether emergency measures are required for the power facilities to be confirmed, thereby enabling the prediction of whether the overall health of the power facilities will improve after emergency measures are taken.

[0043] In addition, the present invention has the effect of enabling an evaluation operation suitable for the operator by applying existing statistical or empirical knowledge to the soundness evaluation when operating power facilities.

[0044] Figure 1 is an exemplary diagram of a method for evaluating the health of a power facility according to a preferred embodiment of the present invention.

[0045] Figure 2 is an example of Figure 1.

[0046] Figures 3 to 6 are examples of a method for evaluating the health of conventional power equipment.

[0047] To fully understand the structure and effects of the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various forms and can be modified in various ways. However, the description of the present embodiments is provided to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the present invention of the scope of the invention. In the accompanying drawings, components are illustrated in an enlarged size for convenience of explanation, and the proportions of each component may be exaggerated or reduced.

[0048] Terms such as "first" and "second" may be used to describe various components, but the components should not be limited by these terms. These terms may only be used to distinguish one component from another. For example, without departing from the scope of the present invention, a "first component" may be referred to as a "second component," and similarly, a "second component" may also be referred to as a "first component." Furthermore, singular expressions include plural expressions unless the context clearly dictates otherwise. Terms used in the embodiments of the present invention may be interpreted as having meanings commonly known to those of ordinary skill in the art, unless otherwise defined.

[0049] The present invention relates to a method for evaluating the health of power facilities such as transmission and distribution facilities, and the subject of the health evaluation is a computing device that inputs various data and calculates the health according to a given program, and in particular, a processor of the computing device.

[0050] That is, even if there is no special mention in the description of the present invention, it should be understood that the subject performing each step described is a processor.

[0051] Hereinafter, a method for evaluating the health of a power facility according to an embodiment of the present invention will be described in detail with reference to the drawings.

[0052]

[0053] FIG. 1 is a flowchart of a method for evaluating the health of a power facility according to a preferred embodiment of the present invention, and FIG. 2 is an exemplary diagram of FIG. 1.

[0054] Referring to FIGS. 1 and 2, the method includes a step of receiving evaluation items (S10), a step of classifying evaluation items (S20), a step of calculating a grade for each evaluation item and assigning a health score if the classification result of step S20 is a condition item, a step of calculating a condition index for predicting equipment failure by assigning a health score (S30), a step of calculating a grade for each evaluation item and assigning a weight if the classification result of step S20 is a deterioration item, a step of calculating a deterioration index for checking the degree of deterioration of power equipment by assigning a weight (S40), a step of calculating a strategic index indicating the status of the power evaluation item selected by the operator by assigning a grade and a health score for each evaluation item if the classification result of step S20 is a strategic evaluation item, and a step of calculating a strategic index indicating the status of the power evaluation item selected by the operator by assigning a grade and a health score to each evaluation item, and a step of comparing the condition index, the deterioration index, and the strategic index and determining the lowest score as the final health index (S60).

[0055] Hereinafter, the configuration and operation of a method for evaluating the health of power equipment according to a preferred embodiment of the present invention configured as described above will be described in more detail.

[0056] First, the processor receives evaluation items as input, as in step S10.

[0057] Evaluation items include a variety of data that can be used to verify the performance of various components of power equipment. Evaluation items can be entered via an input device.

[0058] Input devices at this time may include wired or wireless communication devices, direct input devices such as keyboards and mice, memory accessible to the processor, databases, etc.

[0059] That is, evaluation items are input through various devices capable of receiving evaluation items as data from the processor of the computing device for carrying out the present invention.

[0060] Examples of evaluation items may include, as previously explained, the age of the equipment, equipment installation environment items, appearance inspection items, and characteristic measurement items such as voltage and current.

[0061] Next, the processor classifies the evaluation items as in step S20.

[0062] The processor classifies the evaluation items according to pre-given classification criteria.

[0063] The classification criteria can be categorized into condition evaluation items, which are evaluation items that require immediate emergency treatment for power facilities, deterioration evaluation items that can check the degree of deterioration of power facilities, and strategic evaluation items, which are strategic criteria designated by the operator.

[0064] Condition assessment items can be characteristic measurements for each component of a power facility. Specifically, if an abnormality is detected in voltage, current, temperature, resistance, or other values ​​within a power facility component, immediate emergency action is required for that component. These values ​​are classified according to preset criteria as condition assessment items.

[0065] Additionally, the deterioration evaluation items that check the deterioration of power equipment can include insulation performance and appearance inspection items of components.

[0066] Additionally, strategic evaluation items may be those designated by the power facility operator. For example, a strategic evaluation item may be the operating years (age) of the power facility. The operating years may be determined by considering factors such as the statistical lifespan of the facility and the importance of the load.

[0067] Strategic evaluation items are not limited to the number of years of operation, and various items can be selected at the operator's discretion. For example, one or more of the following evaluation items may be selected: condition evaluation items or deterioration evaluation items.

[0068] This is to enable the operator to strategically evaluate the health index by reflecting empirical data on the impact on power facilities when the health of a specific item among the condition evaluation items or deterioration evaluation items deteriorates, depending on the operator's know-how.

[0069] The evaluation items classified as condition evaluation items as a result of the classification in step S20 above are calculated as a condition index through step S30.

[0070] Specifically, step S30 includes a step of calculating an evaluation grade for each condition evaluation item (S31), a step of assigning a health score according to each evaluation grade (S32), a step of checking each health score to see if there is a health score below the median (S33), a step of selecting the lowest health score if there is a health score below the median (S34), a step of multiplying each health score by a weight and adding up the results if there is no health score below the median (S35), and a step of determining the result of step S34 or step S35 as a condition index (S36).

[0071] To explain this in more detail, it is as follows.

[0072] First, in step S31, an evaluation grade is calculated for each classified condition evaluation item.

[0073] The evaluation grades can be classified into five levels: very good, good, average, bad, and very bad.

[0074] To determine an evaluation grade for each condition evaluation item, the processor can compare the condition evaluation items with a reference value. There may be multiple reference values, and the evaluation grade can be determined by determining where the condition evaluation item for a specific component falls among the reference values.

[0075] Next, in step S32, a soundness score is given based on the evaluation grade.

[0076] For example, scores of 4, 3, 2, 1, and 0 can be given based on the evaluation grade.

[0077] The example above describes an example of determining a five-step evaluation grade and the corresponding soundness score. However, if necessary, the evaluation grade levels can be divided into more stages, and the soundness score can be given as an equal number of values ​​according to the number of stages of the evaluation grade.

[0078] Next, in step S33, each of the above condition evaluation items is checked to see if there is a condition evaluation item with a health score below the medium grade.

[0079] If there is a condition evaluation item with a health score below the medium grade, select the lowest health score among the health scores of each condition evaluation item, as in step S34.

[0080] If there are no health scores below the median grade, that is, if all health scores are above the median grade, each health score is given a weight according to the individual importance of the condition evaluation item, as in step S35, and finally the sum of the health scores of the weighted condition evaluation items is calculated.

[0081] Therefore, the results of step S34 serve to inform that there are evaluation items requiring immediate action, and if there are no evaluation items requiring immediate action, a value that can evaluate the overall health of the power facility can be obtained, as in step S35.

[0082] In step S36, the result of step S34 or step S35 is set as the condition index.

[0083] The deterioration evaluation items classified as deterioration evaluation items in the above S20 step are determined as deterioration indices through S40 step.

[0084] Specifically, step S40 includes a step of calculating the evaluation grades of deterioration evaluation items (S41), a step of assigning a soundness score to each evaluation grade (S42), a step of reflecting a weight (S43), a step of calculating the sum of the soundness scores with the weights reflected (S44), and a step of determining the result of step S44 as a deterioration index (S45).

[0085] First, in step S41, the processor compares the degradation evaluation items with the given evaluation grade reference values ​​and assigns an evaluation grade to each item. As previously described, the evaluation grades can be divided into five stages, but the present invention is not limited thereto.

[0086] Next, a soundness score is assigned to each deterioration evaluation item, as in step S42. For example, a five-level soundness score of 4, 3, 2, 1, and 0 can be assigned.

[0087] Next, weights can be assigned to the deterioration evaluation items according to their relative importance, as in step S43.

[0088] The weight at this time is assumed to be a value greater than or equal to 0 and less than 1, and the sum of all weights can be set to 1. This can also apply to the weight assignment in step S35.

[0089] Next, in step S44, all the results of step S43 are added together.

[0090] Next, in step S45, the output result of step S44 is determined as a deterioration index that can be used to check the deterioration of power equipment.

[0091] Strategic evaluation items classified as strategic evaluation items at the S20 stage are determined as strategic indices through the S50 stage.

[0092] Step S50 may include a step of calculating an item-by-item evaluation grade (S51), a step of assigning a soundness score (S52), and a step of determining a strategic index (S53).

[0093] This is to enable the current level of the strategic evaluation items to be confirmed, and is an example of a case where there is one strategic evaluation item. If there are two or more strategic evaluation items, a step of adding up the soundness scores or calculating the average after adding up the soundness scores may be further included after the step of assigning the soundness scores (S52).

[0094] Next, in step S60, the condition index, deterioration index, and strategic index are compared, and the lowest value is selected as the final soundness index.

[0095] At this time, the condition index, deterioration index, and strategic index are determined by the same criteria, and therefore, the index with the lowest score represents the worst result among the current status evaluation results of the power facility.

[0096] Therefore, the final health index can be checked to determine the measures to be taken for the power equipment.

[0097] In addition, the present invention can determine whether power equipment requires immediate action through a condition index, and the degree of deterioration can be determined through a deterioration index.

[0098] In addition, since the strategic evaluation items set by the operator can be confirmed through the strategic index, it is possible to operate the evaluation suitable for the operator by applying existing statistical or empirical knowledge to the soundness evaluation when operating the power facility.

[0099]

[0100] While the embodiments of the present invention have been described above, they are merely exemplary, and those skilled in the art will understand that various modifications and equivalent embodiments are possible. Therefore, the true scope of technical protection of the present invention should be defined by the following claims.

[0101] The present invention relates to a method for evaluating the health of power equipment using natural laws, and has industrial applicability.

Claims

1. A method for evaluating the health of power equipment performed in a processor of a computing device, An input stage that receives evaluation items that can evaluate the status of power facilities; A classification step that classifies the evaluation items into condition evaluation items that can check for failures in power facilities, deterioration evaluation items that can check the degree of deterioration in power facilities, and strategic evaluation items selected by the operator; A strategic index determination step for determining a condition index by processing condition evaluation items, a deterioration index by processing deterioration evaluation items, and a strategic index by processing strategic evaluation items; and A method for evaluating the health of a power facility, comprising a health index determination step of comparing the above condition index, deterioration index and strategic index and determining the index with the lowest value as the final health index.

2. In paragraph 1, The above condition index is, A process of classifying the above condition evaluation items into multiple evaluation grades; The process of assigning a soundness score according to the above evaluation grade; and A method for evaluating the health of a power facility, characterized in that the health is determined through a condition index determination process that selectively determines a condition index that can check the need for immediate action by checking the above health score or a condition index that can check the health of the entire power facility.

3. In paragraph 2, The above condition index determination process is, A process for checking whether among the above soundness scores, there is a soundness score with an evaluation grade below average; and A method for assessing the health of a power facility, including a process of selecting the lowest health score and determining it as a condition index, if a health score below average is included.

4. In paragraph 2, The above condition index determination process is, A process for checking whether among the above soundness scores, there is a soundness score with an evaluation grade below average; and A method for assessing the health of a power facility, including a process of applying weights to all health scores and determining the sum of the weighted health scores as a condition index, if no health scores below average are included.

5. In paragraph 4, The above weights are, A method for evaluating the health of power equipment, characterized in that the value is 0 or more and less than 1, and the sum of the applied weights is 1.

6. In paragraph 1, The above deterioration index is, The process of classifying deterioration evaluation items into multiple levels of evaluation grades; The process of assigning a soundness score based on the above evaluation grade; The process of applying weights to the health scores; and A method for evaluating the health of a power facility, characterized in that the health is determined through a process of determining the sum of weighted health scores as a deterioration index.

7. In paragraph 6, The above weights are, A method for evaluating the health of power equipment, characterized in that the value is 0 or more and less than 1, and the sum of the applied weights is 1.

8. In paragraph 1, The above strategic indices are: The process of classifying strategic evaluation items into multiple evaluation grades; and A method for evaluating the health of a power facility, characterized in that it is determined through a process of assigning a health score according to the above evaluation grade.

9. In paragraph 8, If there are multiple strategic evaluation items above, A method for evaluating the soundness of a power facility, characterized in that the sum of soundness receptions according to the above evaluation grades is determined as a strategic index.

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