CN117498273A - Protection action triggering method, device, equipment and medium for oil immersed transformer - Google Patents
Protection action triggering method, device, equipment and medium for oil immersed transformer Download PDFInfo
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- CN117498273A CN117498273A CN202311504937.8A CN202311504937A CN117498273A CN 117498273 A CN117498273 A CN 117498273A CN 202311504937 A CN202311504937 A CN 202311504937A CN 117498273 A CN117498273 A CN 117498273A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/06—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature in oil-filled electric apparatus
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- Housings And Mounting Of Transformers (AREA)
Abstract
The embodiment of the invention discloses a protection action triggering method, device, equipment and medium of an oil immersed transformer. The method comprises the following steps: determining a target aging degree of the oil-immersed transformer according to the running state of the oil-immersed transformer; obtaining a mapping relation between the aging degree of the oil immersed transformer and a temperature protection threshold value, and determining the target temperature protection threshold value according to the target aging degree and the mapping relation; when the temperature of the oil-immersed transformer is detected to reach the target temperature protection threshold value, triggering the protection action of the oil-immersed transformer. According to the method, the temperature protection threshold value can be dynamically adjusted according to the aging degree of the oil-immersed transformer, and the protection rationality of the oil-immersed transformer is improved.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a protection action triggering method, device, equipment and medium of an oil immersed transformer.
Background
The power transformer is the core of energy conversion and transmission in the power system, and the operation safety of the power transformer is very important for the reliable operation of the power system. An oil-immersed transformer is a main transformer in an electric power system.
In the operation of the oil immersed transformer, the transformer can be overheated when the conditions of short circuit, overload, overhigh ambient temperature, insufficient cooling ventilation and the like are met. And temperature is an important factor affecting the life of the transformer. In the prior art, the protection action of an oil-immersed transformer is usually triggered by a fixed experience value.
However, during continuous operation of the oil-immersed transformer, the oil-immersed transformer is aged to different degrees, so that the normal temperature of the oil-immersed transformer is changed. Therefore, the over protection or under protection is easy to occur by adopting a mode of fixing an experience value, so that the triggering of the protection action of the oil-immersed transformer is unreasonable.
Disclosure of Invention
The invention provides a protection action triggering method, device, equipment and medium of an oil-immersed transformer so as to improve the protection rationality of the oil-immersed transformer.
According to an aspect of the present invention, there is provided a protection action triggering method of an oil-immersed transformer, the method comprising:
determining a target aging degree of the oil-immersed transformer according to the running state of the oil-immersed transformer;
obtaining a mapping relation between the aging degree of the oil immersed transformer and a temperature protection threshold value, and determining a target temperature protection threshold value according to the target aging degree and the mapping relation;
When the temperature of the oil-immersed transformer is detected to reach the target temperature protection threshold, triggering the protection action of the oil-immersed transformer.
Optionally, determining the target aging degree of the oil-immersed transformer according to the operation state of the oil-immersed transformer includes:
according to the running state of the oil-immersed transformer, determining the state grade of the oil-immersed transformer and corresponding environmental parameters, and determining the correlation coefficient between the state grade and each environmental parameter;
acquiring a plurality of target environment parameters respectively corresponding to candidate life evaluation models for evaluating the oil-immersed transformer;
determining a correlation value between the state level and each candidate life evaluation model according to the parameter quantity of the target environment parameter used by each candidate life evaluation model and each correlation coefficient;
selecting at least one target life evaluation model from a plurality of candidate life evaluation models according to the correlation value;
and evaluating the aging degree of the oil-immersed transformer by adopting the target life evaluation model, and determining the target aging degree according to each aging degree.
Optionally, determining the target aging degree according to each aging degree includes:
Determining the sum of the correlation values according to the correlation values corresponding to the target life evaluation models;
calculating the duty ratio of the correlation value corresponding to each target life evaluation model in the sum of the correlation values, and determining the duty ratio as the model weight of the target life evaluation model;
and determining the target aging degree according to the aging degree and the model weight obtained by the evaluation of each target life evaluation model.
Optionally, before obtaining the mapping relationship between the aging degree of the oil immersed transformer and the temperature protection threshold value, the method further includes:
taking a plurality of test oil-immersed transformers selected from the same target evaluation model as the same type of test oil-immersed transformers;
selecting target test oil-immersed transformers with multiple target aging degrees from the same type of test oil-immersed transformers;
performing pressure test on each target test oil immersed transformer, marking a protection action node, and recording the temperature of insulating oil corresponding to the protection action node;
and determining the mapping relation between the aging degree corresponding to the same type of test oil-immersed transformer and the temperature protection threshold according to the target aging degree of each target test oil-immersed transformer and the corresponding insulating oil temperature.
Optionally, determining, according to the target aging degree of each target test oil-immersed transformer and the corresponding insulating oil temperature, a mapping relationship between the aging degree corresponding to the same type of test oil-immersed transformer and a temperature protection threshold value includes:
constructing a coordinate axis, marking the target aging degree of each target test oil immersed transformer and the corresponding insulating oil temperature on the coordinate axis, and generating a relation curve of the aging degree and a temperature protection threshold;
and fitting the relation curve through a polynomial to obtain a polynomial equation, and taking the polynomial equation as a mapping relation between the aging degree corresponding to the same type of test oil immersed transformer and a temperature protection threshold.
Optionally, determining the target temperature protection threshold according to the target aging degree and the mapping relation includes:
determining the category of the oil immersed transformer according to the detection environment required by the selected target life evaluation model when determining the target aging degree;
and according to the category, acquiring a target polynomial equation of a corresponding category, and substituting the target aging degree into the target polynomial equation to obtain a target temperature protection threshold.
Optionally, the alternative lifetime assessment model comprises at least one of:
simoni model, ramu model, fall ou model, montari model, and Crine model.
According to another aspect of the present invention, there is provided a protection action triggering device of an oil-immersed transformer, the device comprising:
the target aging degree determining module is used for determining the target aging degree of the oil-immersed transformer according to the running state of the oil-immersed transformer;
the target temperature protection threshold determining module is used for obtaining a mapping relation between the aging degree of the oil-immersed transformer and the temperature protection threshold and determining a target temperature protection threshold according to the target aging degree and the mapping relation;
and the protection action triggering module is used for triggering the protection action of the oil-immersed transformer when the temperature of the oil-immersed transformer is detected to reach the target temperature protection threshold value.
According to another aspect of the present invention, there is provided an electronic apparatus including:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor, so that the at least one processor can execute the protection action triggering method of the oil immersed transformer according to any embodiment of the present invention.
According to another aspect of the present invention, there is provided a computer readable storage medium storing computer instructions for causing a processor to implement the protection action triggering method of the oil-immersed transformer according to any embodiment of the present invention when executed.
According to the technical scheme, the target aging degree of the oil-immersed transformer is determined according to the running state of the oil-immersed transformer; obtaining a mapping relation between the aging degree of the oil immersed transformer and a temperature protection threshold value, and determining the target temperature protection threshold value according to the target aging degree and the mapping relation; when the temperature of the oil-immersed transformer is detected to reach the target temperature protection threshold, the protection action of the oil-immersed transformer is triggered, the problem of reasonable triggering of the protection action of the oil-immersed transformer is solved, and the protection rationality of the oil-immersed transformer is improved by dynamically adjusting the temperature protection threshold according to the aging degree of the oil-immersed transformer.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a protection action triggering method of an oil-immersed transformer according to a first embodiment of the present invention;
fig. 2 is a flowchart of a protection action triggering method of an oil-immersed transformer according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a protection action triggering device of an oil-immersed transformer according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device for implementing a protection action triggering method of an oil-immersed transformer according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the embodiment of the invention, the oil-immersed transformer is a main transformer in the power system and is a core for energy conversion and transmission in the power system. The operation safety of the oil immersed transformer has important significance for the reliable operation of the power system. The oil immersed transformer is expensive, and if the oil immersed transformer fails, a large-area power failure of the power system can be caused, so that larger direct and indirect losses are caused. Therefore, it is important to reasonably trigger the protection action of the oil-immersed transformer.
In operation, the oil-immersed transformer may suffer from short circuit, overload, excessively high ambient temperature or insufficient cooling and ventilation, which may cause overheating of the oil-immersed transformer and affect the service life of the oil-immersed transformer. In general, the temperature of the oil-immersed transformer is measured, whether the temperature reaches a temperature threshold value is determined, and if the temperature reaches a protection action such as air cooling input, high temperature alarm, over-high oil temperature tripping and the like, which can be correspondingly executed, the oil-immersed transformer is protected. For example, the insulating oil temperature is measured by a platinum thermal resistor (such as PT 100) to determine whether it reaches a temperature threshold.
However, the inventors found that in oil-immersed transformers, the insulating oil and the insulating paper are one complete oil-paper insulating system. With the continuous operation of the oil immersed transformer, the insulating paper in the insulating oil can be aged continuously. The ageing nature of insulating paper is the result of a combination of various physical and chemical reactions. In the aging process of the insulating paper, substances such as moisture, gas, furfural, methanol, total sugar and the like are decomposed continuously and dissolved in the insulating oil, so that physical quantities such as specific heat capacity and the like of the insulating oil are changed. After the oil paper insulation system is doped, the normal temperature of the insulation oil in the normal operation of the oil-immersed transformer can be increased, and the condition that the insulation oil is higher than a temperature threshold value can occur frequently, so that an air-cooled switch is triggered frequently, and the air-cooled system is easy to damage.
After considering the problems, the inventor creatively proposes that the triggering of the protection action of the oil-immersed transformer needs to consider the aging degree of the oil-immersed transformer, and adjusts the temperature threshold according to the aging degree so as to reasonably trigger the protection action of the oil-immersed transformer.
Example 1
Fig. 1 is a flowchart of a protection action triggering method for an oil-immersed transformer according to a first embodiment of the present invention, where the embodiment may be suitable for a protection action triggering situation for an oil-immersed transformer, for example, protection action triggering when the oil-immersed transformer is short-circuited, overloaded, has an excessively high ambient temperature, or has insufficient cooling and ventilation. The method can be executed by a protection action triggering device of the oil-immersed transformer, the protection action triggering device of the oil-immersed transformer can be realized in a form of hardware and/or software, and the protection action triggering device of the oil-immersed transformer can be configured in electronic equipment such as a computer. As shown in fig. 1, the method includes:
step 110, determining the target aging degree of the oil-immersed transformer according to the operation state of the oil-immersed transformer.
The ageing stress of the oilpaper insulation system in the oil-immersed transformer is the combined effect of the mutual influence of a plurality of factors. Therefore, the target aging degree of the oil-immersed transformer can be determined according to the operation state of the oil-immersed transformer through a multi-factor combined aging model such as electric-thermal combined stress. For example, the target aging degree of the oil-immersed transformer may be determined by combining the operating state of the oil-immersed transformer through one or more life assessment models of a Simoni model, a ram model, a fall ou model, a montani model, and a Crine model.
The service life evaluation model considers the synergistic effect of the electric and heat combined action, and uses the electric stress (voltage or field intensity) and the thermal stress (temperature) born by the insulating material as independent variables to represent the analysis type of the insulating service life, thereby having respective application occasions. The life assessment models are more or less dependent on environmental parameters, which may be internal parameters, such as winding temperature, current, voltage, or external parameters, such as temperature, humidity, etc. of the air. Therefore, according to the operation state of the oil-immersed transformer, the environmental parameter value can be determined, and the target aging degree of the oil-immersed transformer can be determined by combining the life evaluation model.
However, aging of the oilpaper insulation system is a very complex process, each life evaluation model has advantages and disadvantages of different degrees and application ranges, and it is difficult to determine a life evaluation model with universality and high accuracy, and accurately determine the target aging degree of the oil-immersed transformer.
In this regard, the technical solution of the embodiment of the present invention further improves the determination of the target aging degree of the oil-immersed transformer. Specifically, in an optional implementation manner of the embodiment of the present invention, determining, according to an operation state of the oil-immersed transformer, a target aging degree of the oil-immersed transformer includes: according to the running state of the oil-immersed transformer, determining the state grade of the oil-immersed transformer and corresponding environmental parameters, and determining the correlation coefficient between the state grade and the environmental parameters; acquiring a plurality of target environment parameters respectively corresponding to candidate life evaluation models for evaluating the oil-immersed transformer; according to the parameter quantity of the target environment parameters used by each candidate life evaluation model and each correlation coefficient, determining the correlation value of the state grade and each candidate life evaluation model; selecting at least one target life evaluation model from a plurality of candidate life evaluation models according to the correlation value; and evaluating the aging degree of the oil-immersed transformer by adopting a target life evaluation model, and determining the target aging degree according to each aging degree.
The operation states of the oil-immersed transformer can be divided into different state levels. Such as normal operation, risk, and abnormal operation, etc. The specific division manner may be various, for example, a technician may perform calibration according to experience, or may perform calibration by using machine learning or deep learning in combination with environmental parameters in an operation state, which is not particularly limited in the embodiment of the present invention.
The different state levels of the oil-immersed transformer are substantially caused by different environmental parameters, so that a certain correlation exists between the state levels and the environmental parameters, and the correlation coefficients of the state levels and the environmental parameters can be determined through a correlation algorithm. For example, the correlation coefficient between the state level and each environmental parameter may be determined by an algorithm such as pearson correlation coefficient, spearman level correlation coefficient, or Kendall rank correlation coefficient, which is not particularly limited in the embodiment of the present invention.
In an alternative implementation of the embodiment of the present invention, the alternative lifetime assessment model comprises at least one of: simoni model, ramu model, fall ou model, montari model, and Crine model. The same or different environmental parameters may be used for each candidate life assessment model, and the environmental parameters used for the candidate life assessment model may be used as target environmental parameters corresponding to the candidate life assessment model.
The correlation value may be exemplified byFormula (VI)And (5) determining. Wherein S is a correlation value between the state level and the currently calculated candidate life assessment model, n is the parameter number of the target environmental parameters used in the candidate life assessment model,/a-> Is the average value of the correlation coefficient between the state grade and each target environment parameter, x i For the correlation coefficient of the state grade and the ith target environmental parameter, alpha and beta are weights, and are used for adjusting the quantity and the importance degree of the correlation coefficient, alpha<β。
In the embodiment of the invention, the correlation value can be understood as the deformation of the sigmoid function, and thereforeIn the interval [ -5,5]And during internal movement, the correlation value difference is larger, and the method can be better used for selecting a target life evaluation model. In selecting the value, n can be a value greater than 0, and can generally take a value in the range of 2 to 5, ">Less than 1. Illustratively, α may be selected from-0.5 and β may be selected from 5; alternatively, α may be selected from 0.1, β may be selected from 4, etc.
When the relevant values of the state grade and each candidate life evaluation model are determined, the reliability evaluation performance of the candidate life evaluation model can be improved by considering the parameter quantity of the environmental parameters. The higher the correlation value, the higher the reliability of the alternative life assessment model in assessing the degree of aging. After the relevant values of the state grade and each candidate life evaluation model are determined, a target life evaluation model can be selected according to the relevant values, and the aging degree of the oil-immersed transformer is evaluated by adopting the target life evaluation model.
For example, an alternative life evaluation model with the highest correlation value can be selected as a target life evaluation model, and the aging degree of the oil-immersed transformer is evaluated to obtain a target aging degree. Or, the top N candidate life assessment models with the highest correlation values can be selected as target life assessment models, and a plurality of target life assessment models are adopted to evaluate the aging degree of the oil-immersed transformer. For the situation that the aging degree of the oil-immersed transformer is evaluated by the multiple target life evaluation models, corresponding aging degrees can be obtained respectively, and the target aging degree is determined according to each aging degree. For example, an average value, an intermediate value, a weighted value, or the like of a plurality of aging degrees may be determined as the target aging degree.
The state grade is determined according to the running state of the oil-immersed transformer, the correlation coefficient of the state grade and each environmental parameter is determined, the correlation value of the state grade and the candidate life evaluation model is further determined, the target life evaluation model is selected according to the correlation value to evaluate the aging degree of the oil-immersed transformer, the reliability of the aging degree evaluation of the oil-immersed transformer is improved, and therefore a more reasonable temperature threshold value can be determined according to the reliable aging degree, and the rationality of triggering the protection action of the oil-immersed transformer is improved.
And 120, acquiring a mapping relation between the aging degree of the oil-immersed transformer and the temperature protection threshold value, and determining the target temperature protection threshold value according to the target aging degree and the mapping relation.
The mapping relationship between the aging degree and the temperature protection threshold value may be a mapping relationship generated in advance, for example, a mapping function or a mapping table. For example, oil-immersed transformers with different aging degrees can be selected for pressure test, and a temperature value corresponding to the trigger of the protection action is measured and used as a temperature protection threshold corresponding to the aging degree, so that a mapping relation between the aging degree and the temperature protection threshold is generated. Furthermore, the corresponding target temperature protection threshold value can be determined according to the target aging degree and the mapping relation. The temperature protection threshold is adjusted according to the aging degree of the oil-immersed transformer, so that the temperature protection threshold is dynamically adjusted according to the specific use condition of the oil-immersed transformer, and the rationalization and the accurate protection of the oil-immersed transformer are realized.
And 130, triggering the protection action of the oil-immersed transformer when the temperature of the oil-immersed transformer is detected to reach the target temperature protection threshold value.
According to the technical scheme of the embodiment, the target aging degree of the oil-immersed transformer is determined according to the running state of the oil-immersed transformer; obtaining a mapping relation between the aging degree of the oil immersed transformer and a temperature protection threshold value, and determining the target temperature protection threshold value according to the target aging degree and the mapping relation; when the temperature of the oil-immersed transformer is detected to reach the target temperature protection threshold, the protection action of the oil-immersed transformer is triggered, the problem of reasonable triggering of the protection action of the oil-immersed transformer is solved, a more reasonable temperature threshold can be determined according to the reliable aging degree, and the rationality of triggering of the protection action of the oil-immersed transformer is improved.
Example two
Fig. 2 is a flowchart of a protection action triggering method of an oil-immersed transformer according to a second embodiment of the present invention, where the technical solution in this embodiment is further refined, and the technical solution in this embodiment may be combined with each alternative solution in one or more embodiments. As shown in fig. 2, the method includes:
step 210, determining a state grade of the oil-immersed transformer and corresponding environmental parameters according to the operation state of the oil-immersed transformer, and determining correlation coefficients of the state grade and the environmental parameters.
Step 220, obtaining a plurality of target environment parameters corresponding to the candidate life evaluation models for evaluating the oil-immersed transformer.
Wherein the alternative life assessment model comprises at least one of: simoni model, ramu model, fall ou model, montari model, and Crine model.
Step 230, determining the correlation value between the state level and each candidate life assessment model according to the parameter number of the target environmental parameters used by each candidate life assessment model and each correlation coefficient.
Step 240, selecting at least one target life assessment model from a plurality of candidate life assessment models according to the correlation value.
And 250, evaluating the aging degree of the oil-immersed transformer by adopting a target life evaluation model, and determining the target aging degree according to each aging degree.
In an alternative implementation of the embodiment of the present invention, determining the target aging degree according to each aging degree includes: determining the sum of the correlation values according to the correlation values corresponding to the target life evaluation models; calculating the duty ratio of the correlation value corresponding to each target life evaluation model in the sum of the correlation values, and determining the duty ratio as the model weight of the target life evaluation model; and determining the target aging degree according to the aging degree and the model weight obtained by evaluating the target life evaluation models.
Wherein the number of target lifetime assessment models may be a plurality. For example, the candidate life assessment model corresponding to the first three in descending order of correlation values may be selected as the target life assessment model. And carrying out weighted summation on the aging degrees obtained by the evaluation of the multiple target life evaluation models to determine the target aging degree. The model weight of each target life assessment model may be the duty cycle of the correlation value of the model in the sum of the correlation values of all selected target life assessment models.
For example, the target lifetime assessment model 1, the target lifetime assessment model 2, and the target lifetime assessment model 3 are selected for the aging degree assessment, and the correlation values corresponding to these are 0.98, 0.95, and 0.89, respectively. The model weights of the target lifetime assessment model 1, the target lifetime assessment model 2, and the target lifetime assessment model 3 are respectively: 0.98/(0.98+0.95+0.89); 0.95/(0.98+0.95+0.89); 0.89/(0.98+0.95+0.89). And determining model weights for all the target life assessment models through the correlation values, and carrying out weighted summation according to the model weights and the aging degrees to obtain the target aging degrees of the oil-immersed transformer, so that the accuracy of determining the aging degrees of the oil-immersed transformer is improved.
Step 260, obtaining a mapping relation between the aging degree of the oil immersed transformer and the temperature protection threshold, and determining the target temperature protection threshold according to the target aging degree and the mapping relation.
Before determining the target temperature protection threshold, the mapping relationship needs to be determined. In an optional implementation manner of the embodiment of the present invention, before obtaining the mapping relationship between the aging degree of the oil-immersed transformer and the temperature protection threshold value, the method further includes: taking a plurality of test oil-immersed transformers selected from the same target evaluation model as the same type of test oil-immersed transformers; selecting target test oil-immersed transformers with multiple target aging degrees from the same type of test oil-immersed transformers; performing pressure test on each target test oil immersed transformer, marking a protection action node, and recording the temperature of insulating oil corresponding to the protection action node; and determining the mapping relation between the aging degree corresponding to the same type of test oil-immersed transformer and the temperature protection threshold according to the target aging degree of each target test oil-immersed transformer and the corresponding insulating oil temperature.
In order to improve the high availability of the mapping relation, a plurality of test oil-immersed transformers can be selected and classified. Specifically, the transformer classification can be performed according to the type of the target evaluation model used by each test oil-immersed transformer in evaluating the aging degree. For example, for each of the test oil-immersed transformers 1, 2, 5, and 8, the aging degree is evaluated by using the target life evaluation model 1, 2, and 5, and then the test oil-immersed transformers 1, 2, 5, and 8 may be classified into the same type of test oil-immersed transformer.
And selecting target test oil-immersed transformers with various target aging degrees from the same type of test oil-immersed transformers, and performing pressure test in an isolated environment. In order to improve the reliability of the mapping relationship, the selected multiple target test oil immersed transformers should be uniformly distributed at different aging degrees. In the environment of pressure test, various safety behaviors are closed, overload operation is carried out on the target test oil-immersed transformer, and technicians can monitor the working condition of the target test oil-immersed transformer and mark nodes of various protection actions according to the working condition. The electronic equipment can automatically record the corresponding insulating oil temperature to form an oil temperature curve, and map the node of the protection action to the oil temperature curve to obtain the corresponding relation between the target aging degree of the target test oil immersed transformer and the insulating oil temperature of the protection action. And then according to the target aging degree and the corresponding insulating oil temperature, the mapping relation between the aging degree corresponding to the same type of test oil immersed transformer and the temperature protection threshold value under various protection actions can be determined.
Specifically, the mapping relationship may be determined in various manners, for example, according to the target aging degree and the corresponding insulating oil temperature, a mapping table may be generated as a mapping relationship between the aging degree corresponding to the same type of test oil immersed transformer and the temperature protection threshold. Alternatively, a mapping curve may be generated as a mapping relation between the aging degree corresponding to the same type of test oil immersed transformer and the temperature protection threshold according to the target aging degree and the corresponding insulating oil temperature. Or, a mapping curve is generated according to the target aging degree and the corresponding insulating oil temperature, then the mapping curve is fitted to obtain a mapping function, and the mapping function is used as a mapping relation between the aging degree corresponding to the same type of test oil immersed transformer and the temperature protection threshold value.
In an optional implementation manner of the embodiment of the present invention, determining, according to the target aging degree of each target test oil-immersed transformer and the corresponding insulating oil temperature, a mapping relationship between the aging degree corresponding to the same type of test oil-immersed transformer and a temperature protection threshold value includes: constructing a coordinate axis, marking the target aging degree of each target test oil immersed transformer and the corresponding insulating oil temperature on the coordinate axis, and generating a relation curve of the aging degree and a temperature protection threshold; and obtaining a polynomial equation by fitting a relation curve through a polynomial, and taking the polynomial equation as a mapping relation between the aging degree and the temperature protection threshold corresponding to the same type of test oil-immersed transformer.
The coordinate axis may be a horizontal axis representing the target aging degree, and the vertical axis representing the insulating oil temperature, and the target aging degree and the corresponding insulating oil temperature are plotted in the coordinate axis to generate a relationship curve between the aging degree and the temperature protection threshold. And fitting the relation curve through a polynomial to obtain a polynomial equation as a mapping relation.
Different life assessment models may rely on different detection environments in assessing the degree of aging. For example, a Crine model, a montari model, a Ramu model, and a fall ou model are required to apply voltages, and a Simoni model is required to apply dielectric electric fields and voltages. Therefore, according to the target aging degree and the mapping relation, determining the target temperature protection threshold value comprises the following steps: determining the category of the oil-immersed transformer according to the detection environment required by the selected target life evaluation model when determining the target aging degree; and according to the category, acquiring a target polynomial equation of the corresponding category, and substituting the target aging degree into the target polynomial equation to obtain a target temperature protection threshold.
That is, when the protection operation of the oil-immersed transformer is triggered, the category of the oil-immersed transformer is measured, and the mapping relation of the corresponding type, namely the target polynomial equation, is matched according to the category. Thus, substituting the target aging degree into the target polynomial equation to obtain the target temperature protection threshold.
Step 270, triggering the protection action of the oil-immersed transformer when the temperature of the oil-immersed transformer is detected to reach the target temperature protection threshold.
According to the technical scheme, the state grade of the oil-immersed transformer and corresponding environment parameters are determined according to the running state of the oil-immersed transformer, and the correlation coefficient between the state grade and the environment parameters is determined; acquiring a plurality of target environment parameters respectively corresponding to candidate life evaluation models for evaluating the oil-immersed transformer; according to the parameter quantity of the target environment parameters used by each candidate life evaluation model and each correlation coefficient, determining the correlation value of the state grade and each candidate life evaluation model; selecting at least one target life evaluation model from a plurality of candidate life evaluation models according to the correlation value; evaluating the aging degree of the oil-immersed transformer by adopting a target life evaluation model, and determining the target aging degree according to each aging degree; obtaining a mapping relation between the aging degree of the oil immersed transformer and a temperature protection threshold value, and determining the target temperature protection threshold value according to the target aging degree and the mapping relation; when the temperature of the oil-immersed transformer is detected to reach the target temperature protection threshold value, the protection action of the oil-immersed transformer is triggered, the problem that the protection action of the oil-immersed transformer is reasonably triggered is solved, the reliable aging degree can be obtained by selecting a proper life evaluation model, further, the more reasonable temperature threshold value is determined, and the rationality of triggering the protection action of the oil-immersed transformer is improved.
Example III
Fig. 3 is a schematic structural diagram of a protection action triggering device of an oil-immersed transformer according to a third embodiment of the present invention. As shown in fig. 3, the apparatus includes: a target aging level determination module 310, a target temperature protection threshold determination module 320, and a protection action triggering module 330. Wherein:
the target aging degree determining module 310 is configured to determine a target aging degree of the oil-immersed transformer according to an operation state of the oil-immersed transformer;
the target temperature protection threshold determining module 320 is configured to obtain a mapping relationship between an aging degree of the oil-immersed transformer and a temperature protection threshold, and determine a target temperature protection threshold according to the target aging degree and the mapping relationship;
the protection action triggering module 330 is configured to trigger a protection action of the oil-immersed transformer when detecting that the temperature of the oil-immersed transformer reaches a target temperature protection threshold.
Optionally, the target aging degree determining module 310 includes:
the correlation coefficient determining unit is used for determining the state grade of the oil-immersed transformer and corresponding environment parameters according to the running state of the oil-immersed transformer, and determining the correlation coefficient of the state grade and the environment parameters;
The oil immersed transformer comprises a target environment parameter acquisition unit, a target environment parameter analysis unit and a target environment parameter analysis unit, wherein the target environment parameter acquisition unit is used for acquiring a plurality of target environment parameters respectively corresponding to a plurality of candidate life evaluation models for evaluating the oil immersed transformer;
the correlation value determining unit is used for determining the correlation value between the state level and each candidate life evaluation model according to the parameter quantity of the target environment parameter used by each candidate life evaluation model and each correlation coefficient;
the target life evaluation model selection unit is used for selecting at least one target life evaluation model from a plurality of candidate life evaluation models according to the correlation value;
and the target aging degree determining unit is used for evaluating the aging degree of the oil-immersed transformer by adopting the target life evaluation model and determining the target aging degree according to each aging degree.
Optionally, the target aging degree determining unit is specifically configured to:
determining the sum of the correlation values according to the correlation values corresponding to the target life evaluation models;
calculating the duty ratio of the correlation value corresponding to each target life evaluation model in the sum of the correlation values, and determining the duty ratio as the model weight of the target life evaluation model;
and determining the target aging degree according to the aging degree and the model weight obtained by evaluating the target life evaluation models.
Optionally, the device further includes:
the transformer classification module is used for selecting a plurality of test oil-immersed transformers with the same target evaluation model as the same type of test oil-immersed transformers before acquiring the mapping relation between the aging degree of the oil-immersed transformers and the temperature protection threshold value;
the transformer selection module is used for selecting target test oil-immersed transformers with various target aging degrees from the same type of test oil-immersed transformers;
the insulation oil temperature recording module is used for performing pressure test on each target test oil immersed transformer, marking a protection action node and recording the insulation oil temperature corresponding to the protection action node;
and the mapping relation determining module is used for determining the mapping relation between the aging degree corresponding to the same type of test oil-immersed transformer and the temperature protection threshold according to the target aging degree of each target test oil-immersed transformer and the corresponding insulating oil temperature.
Optionally, the mapping relation determining module includes:
the relation curve generating unit is used for constructing a coordinate axis, marking the target aging degree of each target test oil immersed transformer and the corresponding insulating oil temperature on the coordinate axis, and generating a relation curve of the aging degree and the temperature protection threshold;
The mapping relation determining unit is used for obtaining a polynomial equation through polynomial fitting relation curves, and using the polynomial equation as a mapping relation between the aging degree corresponding to the same type of test oil immersed transformer and the temperature protection threshold value.
Optionally, the target temperature protection threshold determination module 320 includes:
the category determining unit is used for determining the category of the oil-immersed transformer according to the detection environment required by the selected target life evaluation model when determining the target aging degree;
and the target temperature protection threshold determining unit is used for acquiring a target polynomial equation of a corresponding category according to the category to which the target temperature protection threshold belongs, and substituting the target aging degree into the target polynomial equation to obtain the target temperature protection threshold.
Optionally, the alternative lifetime assessment model comprises at least one of:
simoni model, ramu model, fall ou model, montari model, and Crine model.
The protection action triggering device of the oil-immersed transformer provided by the embodiment of the invention can execute the protection action triggering method of the oil-immersed transformer provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
Example IV
Fig. 4 shows a schematic diagram of the structure of an electronic device 10 that may be used to implement an embodiment of the invention. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. Electronic equipment may also represent various forms of mobile devices, such as personal digital processing, cellular telephones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
As shown in fig. 4, the electronic device 10 includes at least one processor 11, and a memory, such as a Read Only Memory (ROM) 12, a Random Access Memory (RAM) 13, etc., communicatively connected to the at least one processor 11, in which the memory stores a computer program executable by the at least one processor, and the processor 11 may perform various appropriate actions and processes according to the computer program stored in the Read Only Memory (ROM) 12 or the computer program loaded from the storage unit 18 into the Random Access Memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 may also be stored. The processor 11, the ROM 12 and the RAM 13 are connected to each other via a bus 14. An input/output (I/O) interface 15 is also connected to bus 14.
Various components in the electronic device 10 are connected to the I/O interface 15, including: an input unit 16 such as a keyboard, a mouse, etc.; an output unit 17 such as various types of displays, speakers, and the like; a storage unit 18 such as a magnetic disk, an optical disk, or the like; and a communication unit 19 such as a network card, modem, wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information/data with other devices via a computer network, such as the internet, and/or various telecommunication networks.
The processor 11 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, digital Signal Processors (DSPs), and any suitable processor, controller, microcontroller, etc. The processor 11 performs the various methods and processes described above, such as the protection action triggering method of an oil-immersed transformer.
In some embodiments, the protection action triggering method of the oil-immersed transformer may be implemented as a computer program, which is tangibly embodied in a computer-readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program may be loaded and/or installed onto the electronic device 10 via the ROM 12 and/or the communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the protection action triggering method of the oil immersed transformer described above may be performed. Alternatively, in other embodiments, processor 11 may be configured to perform the protection action triggering method of the oil-immersed transformer in any other suitable way (e.g. by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for carrying out methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be implemented. The computer program may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) through which a user can provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.
The computing system may include clients and servers. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical hosts and VPS service are overcome.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. The protection action triggering method of the oil immersed transformer is characterized by comprising the following steps of:
determining a target aging degree of the oil-immersed transformer according to the running state of the oil-immersed transformer;
obtaining a mapping relation between the aging degree of the oil immersed transformer and a temperature protection threshold value, and determining a target temperature protection threshold value according to the target aging degree and the mapping relation;
when the temperature of the oil-immersed transformer is detected to reach the target temperature protection threshold, triggering the protection action of the oil-immersed transformer.
2. The method of claim 1, wherein determining the target age of the oil-filled transformer based on the operating state of the oil-filled transformer comprises:
according to the running state of the oil-immersed transformer, determining the state grade of the oil-immersed transformer and corresponding environmental parameters, and determining the correlation coefficient between the state grade and each environmental parameter;
acquiring a plurality of target environment parameters respectively corresponding to candidate life evaluation models for evaluating the oil-immersed transformer;
determining a correlation value between the state level and each candidate life evaluation model according to the parameter quantity of the target environment parameter used by each candidate life evaluation model and each correlation coefficient;
selecting at least one target life evaluation model from a plurality of candidate life evaluation models according to the correlation value;
and evaluating the aging degree of the oil-immersed transformer by adopting the target life evaluation model, and determining the target aging degree according to each aging degree.
3. The method of claim 2, wherein determining a target age from each of the ages comprises:
Determining the sum of the correlation values according to the correlation values corresponding to the target life evaluation models;
calculating the duty ratio of the correlation value corresponding to each target life evaluation model in the sum of the correlation values, and determining the duty ratio as the model weight of the target life evaluation model;
and determining the target aging degree according to the aging degree and the model weight obtained by the evaluation of each target life evaluation model.
4. The method of claim 2, further comprising, prior to obtaining the mapping of the aging level of the oil-immersed transformer to the temperature protection threshold:
taking a plurality of test oil-immersed transformers selected from the same target evaluation model as the same type of test oil-immersed transformers;
selecting target test oil-immersed transformers with multiple target aging degrees from the same type of test oil-immersed transformers;
performing pressure test on each target test oil immersed transformer, marking a protection action node, and recording the temperature of insulating oil corresponding to the protection action node;
and determining the mapping relation between the aging degree corresponding to the same type of test oil-immersed transformer and the temperature protection threshold according to the target aging degree of each target test oil-immersed transformer and the corresponding insulating oil temperature.
5. The method of claim 4, wherein determining the mapping between the aging degree and the temperature protection threshold corresponding to the same type of test oil immersed transformer according to the target aging degree of each target test oil immersed transformer and the corresponding insulating oil temperature comprises:
constructing a coordinate axis, marking the target aging degree of each target test oil immersed transformer and the corresponding insulating oil temperature on the coordinate axis, and generating a relation curve of the aging degree and a temperature protection threshold;
and fitting the relation curve through a polynomial to obtain a polynomial equation, and taking the polynomial equation as a mapping relation between the aging degree corresponding to the same type of test oil immersed transformer and a temperature protection threshold.
6. The method of claim 5, wherein determining a target temperature protection threshold based on the target aging level and the mapping relationship comprises:
determining the category of the oil immersed transformer according to the detection environment required by the selected target life evaluation model when determining the target aging degree;
and according to the category, acquiring a target polynomial equation of a corresponding category, and substituting the target aging degree into the target polynomial equation to obtain a target temperature protection threshold.
7. The method of claim 2, wherein the alternative lifetime assessment model comprises at least one of:
simoni model, ramu model, fall ou model, montari model, and Crine model.
8. The utility model provides a protection action trigger device of oil-immersed transformer which characterized in that includes:
the target aging degree determining module is used for determining the target aging degree of the oil-immersed transformer according to the running state of the oil-immersed transformer;
the target temperature protection threshold determining module is used for obtaining a mapping relation between the aging degree of the oil-immersed transformer and the temperature protection threshold and determining a target temperature protection threshold according to the target aging degree and the mapping relation;
and the protection action triggering module is used for triggering the protection action of the oil-immersed transformer when the temperature of the oil-immersed transformer is detected to reach the target temperature protection threshold value.
9. An electronic device, the electronic device comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the protection action triggering method of the oil-immersed transformer of any one of claims 1-7.
10. A computer readable storage medium, characterized in that the computer readable storage medium stores computer instructions for causing a processor to implement the protection action triggering method of the oil immersed transformer according to any one of claims 1-7 when executed.
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