CN114297948A - On-pole circuit breaker state evaluation method and system - Google Patents
On-pole circuit breaker state evaluation method and system Download PDFInfo
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Abstract
The application discloses pole circuit breaker state evaluation method and system, including: establishing an evaluation index set and an evaluation set for evaluating the state of the circuit breaker on the column; establishing membership functions of the on-off wear subset, the insulation medium subset and the operation parameter subset in various states of the evaluation set, and establishing an expert evaluation table of the working environment of the pole-mounted circuit breaker; solving the weight of each subset in the evaluation index set; solving and establishing a one-dimensional evaluation matrix of the breaking wear, the insulating medium, the operation parameters and the working environment based on the membership function and the expert evaluation table; adding two-dimensional disturbance factors to each one-dimensional evaluation matrix and each weight respectively, and solving a comprehensive evaluation model of the on-column breaker state by adding the two-dimensional disturbance factors and utilizing a disturbance fuzzy principle; and analyzing and solving to obtain the state of the pole-mounted circuit breaker according to a maximum membership principle based on a comprehensive evaluation model. The problem of prior art because subjective randomness is big leads to the evaluation reliability relatively poor is solved.
Description
Technical Field
The application relates to the technical field of electric power, in particular to a method and a system for evaluating the state of a pole-mounted circuit breaker.
Background
With the rapid increase of economy and the rapid increase of the capacity of a power grid, the power grid puts higher and higher requirements on the reliability of power supply. While pole top breakers play a very important role throughout the distribution network. Once the breaker breaks down, a large-area power failure accident can be caused. This not only requires a great deal of manpower and material resources to maintain, but also even results in huge economic losses. Therefore, it is necessary to evaluate the state of the pole breaker during the operation of the pole breaker.
The evaluation of the state of the pole top circuit breaker involves a number of factors of the circuit breaker. At present, research on state evaluation of the pole-mounted circuit breaker at home and abroad involves few. A small number of expert scholars also make researches on the state evaluation model of the circuit breaker on the SF6 column, and most of the researched models are built on the basis of the analytic hierarchy process. However, the single analytic hierarchy process has the disadvantages of large subjective randomness, large influence of artificial factors and the like.
Disclosure of Invention
The application provides a pole-mounted circuit breaker state evaluation method and system, which are used for solving the technical problem of poor evaluation reliability caused by large subjective randomness in the prior art.
In view of the above, a first aspect of the present application provides a method for evaluating a state of an on-pole circuit breaker, the method including:
the evaluation index set comprises an evaluation index set and an evaluation set for evaluating the state of the circuit breaker on the building column, wherein the evaluation index set comprises: the system comprises an on-off wear subset, an insulating medium subset, an operating parameter subset and a working environment subset, wherein the evaluation set comprises: normal state, attention state, abnormal state, severe state;
respectively establishing membership functions of the on-off wear subset, the insulation medium subset and the operation parameter subset in various states in the evaluation set, and establishing an expert evaluation table of the working environment of the pole-mounted circuit breaker;
solving the weight of each subset in the evaluation index set through an additive synthesis method;
respectively inputting the real-time operation parameters of the pole-mounted circuit breaker into the membership functions and the expert evaluation table, and solving to obtain a one-dimensional evaluation matrix of the breaking wear, the insulating medium, the operation parameters and the working environment;
adding two-dimensional disturbance factors to each one-dimensional evaluation matrix and each weight respectively to obtain one-dimensional comprehensive evaluation matrices of on-off wear, insulating media, operation parameters and working environment, and constructing a comprehensive evaluation model of the on-column breaker state based on each one-dimensional comprehensive evaluation matrix;
and analyzing and solving to obtain the state of the pole-mounted circuit breaker according to a maximum membership principle based on the comprehensive evaluation model.
Optionally, the adding a two-dimensional disturbance factor to each one-dimensional evaluation matrix and each weight to obtain a one-dimensional comprehensive evaluation matrix of the on-off wear, the insulating medium, the operating parameter, and the working environment includes:
adding two-dimensional disturbance factors to each one-dimensional evaluation matrix and each weight respectively to obtain a two-dimensional evaluation matrix and a two-dimensional weight of each subset;
and respectively carrying out one-dimensional treatment and normalization treatment on the two-dimensional evaluation matrix and the two-dimensional weight in sequence to obtain a one-dimensional comprehensive evaluation matrix of the breaking wear, the insulating medium, the operation parameters and the working environment.
Optionally, the building of the comprehensive evaluation model of the on-pole circuit breaker state based on each one-dimensional comprehensive evaluation matrix specifically includes:
and respectively adding two-dimensional disturbance factors to each one-dimensional comprehensive evaluation matrix again, and sequentially carrying out one-dimensional and normalization processing to obtain the comprehensive evaluation model.
Optionally, the constructing an expert evaluation table of the working environment of the pole top circuit breaker specifically includes:
and filling a table by column circuit breaker research experts and field workers to obtain column circuit breaker parameters required by a fuzzy statistical method, and constructing an expert evaluation table of the working environment of the column circuit breaker according to the column circuit breaker parameters.
Optionally, the solving of the weight of each subset in the evaluation index set by an additive synthesis method specifically includes:
the structure of the pole-mounted circuit breaker is divided, and weights of breaking wear, insulating media, operating parameters and working environment are analyzed through an additive synthesis method and normalized to obtain the weights.
Optionally, the on-off wear subset specifically includes: service life, cumulative number of actions, relative point wear.
Optionally, the subset of insulating mediums specifically includes: vacuum pressure, humidity, primary circuit to ground insulation.
Optionally, the operating parameter subset specifically includes: the switching-on different period, the switching-off different period, the rigid switching-on speed and the rigid switching-off speed.
Optionally, the subset of the working environments specifically includes: and the pollution level of the temperature and humidity environment.
A second aspect of the present application provides a pole top breaker state evaluation system, the system comprising:
the first establishing unit is used for establishing an evaluation index set and an evaluation set for evaluating the state of the circuit breaker on the post, and the evaluation index set comprises: the system comprises an on-off wear subset, an insulating medium subset, an operating parameter subset and a working environment subset, wherein the evaluation set comprises: normal state, attention state, abnormal state, severe state;
the second establishing unit is used for respectively establishing membership functions of the on-off wear subset, the insulating medium subset and the operation parameter subset in various states in the evaluation set and establishing an expert evaluation table of the working environment of the on-column circuit breaker;
a first calculating unit for solving the weight of each subset in the evaluation index set by an additive synthesis method;
the second calculation unit is used for respectively inputting the real-time operation parameters of the pole-mounted circuit breaker into the membership functions and the expert evaluation table and solving to obtain a one-dimensional evaluation matrix of the breaking wear, the insulating medium, the operation parameters and the working environment;
the third calculation unit is used for adding two-dimensional disturbance factors to each one-dimensional evaluation matrix and each weight respectively, solving one-dimensional comprehensive evaluation matrices of breaking wear, insulating media, operating parameters and working environment, and constructing a comprehensive evaluation model of the on-column breaker state based on each one-dimensional comprehensive evaluation matrix;
and the fourth calculating unit is used for analyzing and solving the state of the pole top breaker according to the maximum membership principle based on the comprehensive evaluation model.
According to the technical scheme, the method has the following advantages:
the application provides a pole circuit breaker state evaluation method, which comprises the following steps: the evaluation index set and the evaluation set of circuit breaker state aassessment on the building post, the evaluation index set includes: the system comprises an on-off wear subset, an insulating medium subset, an operating parameter subset and a working environment subset, wherein the evaluation set comprises: normal state, attention state, abnormal state, severe state; respectively establishing membership functions of the on-off wear subset, the insulation medium subset and the operation parameter subset in various states of the evaluation set, and establishing an expert evaluation table of the working environment of the pole-mounted circuit breaker; solving the weight of each subset in the evaluation index set by an additive synthesis method; respectively inputting real-time operation parameters of the pole-mounted circuit breaker into a membership function and an expert evaluation table, and solving to obtain a one-dimensional evaluation matrix of breaking wear, an insulating medium, operation parameters and a working environment; adding two-dimensional disturbance factors to each one-dimensional evaluation matrix and each weight respectively to obtain a one-dimensional comprehensive evaluation matrix of breaking wear, an insulating medium, an operation parameter and a working environment, and constructing a comprehensive evaluation model of the on-column circuit breaker state based on each one-dimensional comprehensive evaluation matrix; and analyzing and solving to obtain the state of the pole-mounted circuit breaker according to a maximum membership principle based on a comprehensive evaluation model.
Compared with the prior art, the disturbance fuzzy comprehensive evaluation model of the on-column circuit breaker state is constructed by building the evaluation index set and the evaluation set of the on-column circuit breaker state evaluation, the disturbance fuzzy comprehensive evaluation is used as a supplement to a basic evaluation method, and the disturbance fuzzy theory is more reliable for complex on-column circuit breakers with more evaluation factors and larger evaluation parameter fluctuation, so that the technical problem of poor evaluation reliability caused by large subjective randomness in the prior art is solved. Further, based on the disturbance fuzzy comprehensive evaluation model constructed by the method, the state of the whole pole-mounted circuit breaker is evaluated by utilizing various measured data of the pole-mounted circuit breaker, so that the staff can be timely helped to find new hidden dangers, and instructive opinions are provided for making corresponding maintenance work.
Drawings
Fig. 1 is a schematic flowchart of an embodiment of a method for evaluating a state of an on-pole circuit breaker provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of an embodiment of a system for evaluating a state of an on-pole circuit breaker provided in an embodiment of the present application;
fig. 3 is a schematic diagram of an evaluation index set for on-pole breaker state evaluation provided in an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, a method for evaluating a state of a pole top breaker provided in an embodiment of the present application includes:
101, establishing an evaluation index set and an evaluation set for state evaluation of a circuit breaker on a post, wherein the evaluation index set comprises: the system comprises an on-off wear subset, an insulating medium subset, an operating parameter subset and a working environment subset, wherein the evaluation set comprises: normal state, attention state, abnormal state, severe state;
it should be noted that, by referring to relevant data of the pole-mounted circuit breakers in the power system and according to experience knowledge accumulated by professionals who overhaul the plurality of pole-mounted circuit breakers, and taking operability and real-time as basic principles, index factors required in the evaluation of the running state of the pole-mounted circuit breakers are determined, and then the index factors are classified and decomposed layer by layer according to the properties of required evaluation parameters, so as to finally obtain an evaluation index set for the evaluation of the pole-mounted circuit breaker state, as shown in fig. 3.
The establishment process of the pole top breaker evaluation set is as follows:
the evaluation set of the pole-mounted circuit breaker can be divided into evaluation sets according to historical maintenance data and relevant data specifications of the pole-mounted circuit breaker and the current situation that the pole-mounted circuit breaker conforms to the actual situation during maintenance
Wherein
Indicating a "normal" state,
the expression "attention" is used,
indicating an "exception",
indicating 4 states of "severe".
102, respectively establishing membership functions of a cut-off wear subset, an insulation medium subset and an operation parameter subset in various states of an evaluation set, and establishing an expert evaluation table of the working environment of the pole-mounted circuit breaker;
1) the membership function of the on-off wear is established as follows:
according to circuit breakers
Curve, when the current is cut off can be obtained
When the circuit breaker is not on the same time, the rated total number of times of opening the circuit breaker
In contrast, the same method can be used to obtain the electrical wear of a single cut-off
Is defined as
，
The value of (A) is that the pole top circuit breaker can be used with the total allowable value under the action of fixed currentDegree of electrical wear caused by the number of switching-on and switching-off. Has an electrical life of
A positive number not greater than 1 and,
i.e. membership function values.
Under the action of a certain fixed current, when the rated on-off times of the moving contact and the fixed contact of the circuit breaker are N, the conversion function of the accumulated action times is as follows:
in formula 1.1, x represents the number of times that has been used.
When the rated service life of the pole-mounted circuit breaker is M under the action of a certain fixed current, the conversion function of the working life is as follows:
in formula 1.2, x represents the number of years that have been used.
The rated working time of the ZW8-12/630-20kA type vacuum circuit breaker is 20 years (20 years are subjected to complete inspection again), and the mechanical life is 10000 times. The membership functions of the on-off wear between the moving and stationary contacts are shown in Table 1-1.
TABLE 1-1 membership function table for on-off wear between moving and static contacts
2) The membership function of the insulating medium is established as follows:
the insulation method of the pole-mounted circuit breaker is mainly characterized in that a cavity in contact with an upper contact and a lower contact is vacuumized to achieve the effect of vacuum arc extinction, and factors considered for an insulation medium mainly comprise gas pressure in the vacuum cavity, micro-water content and primary loop ground insulation.
Before the ZW8-12/630-20kA type breaker is put into operation, a vacuum degree detection experiment and a sealing performance detection experiment are required, and the vacuum degree in the vacuum cavity can be obtained through the experiments. The conversion formula of the gas pressure is as follows:
in the formula 1.3, m represents the rated pressure of the circuit breaker
pa, alarm pressure n is
pa, equation 1.3 can be converted to:
。
according to the specification of the micro-water content in the vacuum chamber in the preventive test protocol for electrical equipment (DLT 596-2005), the micro-water content in the arc-extinguishing chamber should be less than 150ppm in any operating state and less than 300ppm in the normal operating state. According to the concept of relative degradation, the humidity function can be converted into:
in equation 1.4, n refers to the actual humidity within the vacuum chamber.
For medium or high voltage and extra high voltage, the primary circuit of the coil operates at a high voltage, so the insulation of the circuit breaker from ground is not negligible. When the insulating part is selected, an insulating material with high insulation resistance is considered, and the leakage current of the insulating part must be within an allowable leakage range.
The relevant specifications of the power sector clearly stipulate that the insulation resistance of a high-voltage vacuum circuit breaker must comply with the use specifications before the circuit breaker is put into operation, in order to ensure good insulation performance. GB311.1-1997 stipulates that the phase-to-ground and ground correspondence of primary loop ground-insulated conductors is not less than 5000
. The insulation transfer function is shown in equation 1.5.
Membership functions of gas pressure, micro-water content, primary circuit ground insulation were established as shown in tables 1-2.
TABLE 1-2 attached function table for insulating medium
3) The membership function establishing process of the operation parameters is as follows:
for a pole top circuit breaker, the subset factors of the operating parameters of the body mechanism mainly include: the closing non-synchronization, the opening non-synchronization, the rigid closing speed, the rigid opening speed and the like.
The switching-on and switching-off different phases mainly mean that the circuit breaker is asynchronous when a three-phase coil is switched on or switched off due to mechanical problems, or the circuit breaker which is working has one phase to trip and other two phases do not trip. Such a different period may cause the power system to operate in a non-full phase, resulting in a serious loss to the power supply system.
In the preventive test regulations for electrical equipment (DLT 596-2005), it is pointed out that the specified error value of different stages of halving and closing is different for different pole-mounted circuit breakers, and the specific operation must be within the error range. When the used circuit breaker is not specified, the different closing phases of different coils are less than or equal to 5ms, the different opening phases of different coils are less than or equal to 3ms, and the different opening phases between the same fractures are less than or equal to 2 ms. The switching-on different-phase conversion function is as shown in the formula 1.6:
the switching-off different-phase transfer function is as shown in the formula 1.7.
Membership functions for the closing and opening asynchronism are established as shown in tables 1-3.
TABLE 1-3 membership functions for opening and closing asynchronism
The speed of switching on and switching off is a basic standard for judging whether the performance of the circuit breaker on the post is good or not, and when the switching-off speed is too high, the action of the vacuum arc extinguishing chamber on the electric arc generated between the two contacts is weakened, so that the arc extinguishing is difficult to occur; when the rigid-separation speed is too low, the electric arc generated between the contacts seriously damages the contacts, and the service life of the high-voltage vacuum circuit breaker can be shortened.
The distribution shape of the just opening and closing speed of the pole top circuit breaker is similar to a Gauss distribution function and is expressed as follows:
in formula 1.8: the unit of x is m/s; a is a Gauss function symmetry center and is a standard speed of the pole-mounted circuit breaker during opening and closing; b is the width of the Gauss function and is determined by the use specification and precision of different high-voltage vacuum circuit breakers.
Closing speed of ZW8-12/630-20kA pole-mounted breaker
Velocity of moment
. The stiffness to speed transfer function is given by equation 1.9, expressed as:
the rigid-split velocity transfer function is shown in equation 1.10 and is expressed as:
the membership functions of just-in-just-out and just-in-just speed are shown in tables 1-4.
TABLE 1-4 membership functions of rigid minute and rigid combination speeds
4) The process of constructing the expert evaluation table of the working environment of the pole-mounted circuit breaker is as follows:
parameters required by the fuzzy statistical method are obtained by a column circuit breaker research expert and a form filling method of field experienced workers. And carrying out statistical analysis and calculation on the obtained parameters to finally obtain the membership degree of the corresponding fuzzy evaluation set. The work environment expert evaluation tables for the pole top circuit breakers are shown in tables 1-5.
TABLE 1-5 expert evaluation table for working environment of circuit breaker on post
103, solving the weight of each subset in the evaluation index set through an additive synthesis method;
it should be noted that, according to the basic division of the structure of the pole-mounted circuit breaker, the analytic hierarchy process is applied to analyze the weights of the breaking wear, the insulating medium, the operating parameters and the working environment, and the normalization process is performed, so as to obtain a weight matrix of the pole-mounted circuit breaker as follows:
and (3) solving the weight by using an entropy weight method to obtain:
the final weight is obtained by using an additive synthesis method to obtain:
it should be noted that the real-time operation parameters (the service life, the accumulated action times, the relative point abrasion degree, the vacuum pressure, the humidity, the ground insulation of the primary loop, the different closing periods, the different opening periods, the just closing speed, the just opening speed, and the pollution levels of the temperature and humidity environment) are input into the membership function model established in the step 102 and the expert evaluation table, so as to obtain the one-dimensional evaluation matrix of the breaking abrasion, the insulation medium, the operation parameters and the working environment.
105, adding two-dimensional disturbance factors to each one-dimensional evaluation matrix and each weight respectively to obtain a one-dimensional comprehensive evaluation matrix of breaking wear, an insulating medium, an operation parameter and a working environment, and constructing a comprehensive evaluation model of the on-column breaker state based on each one-dimensional comprehensive evaluation matrix;
first, the following is described. Adding a two-dimensional disturbance factor and performing fuzzy comprehensive judgment, and specifically comprising the following steps:
and adding two-dimensional disturbance factors to the one-dimensional evaluation set and the weight of the on-off wear, the insulating medium, the operating parameters and the working environment respectively.
1) Establishing an evaluation index set U;
2) establishing an evaluation set V;
3) solving a weight set A of two-dimensional disturbance fuzzy evaluation factors;
4) If according to the jth element in the ith class
The evaluation is carried out, wherein the membership degree interval of the kth element in the evaluation set is
Then, the single-factor evaluation matrix of the first-level disturbance fuzzy comprehensive evaluation is:
the fuzzy comprehensive evaluation of the ith factor is as follows:
5) second-order and two-dimensional disturbance fuzzy comprehensive evaluation
Similar to the basic fuzzy theory system structure, the second-order and two-dimensional disturbance fuzzy is also obtained on the basis of the two-dimensional first-order disturbance fuzzy. The first-order fuzzy comprehensive evaluation model comprises the following steps:
the second-order disturbance fuzzy comprehensive evaluation model comprises the following steps:
then, performing a one-dimensional and normalization process, specifically comprising:
and performing one-dimensional processing on the obtained two-dimensional evaluation set of each subset to obtain a one-dimensional evaluation set of each subset, and performing normalization processing on the obtained one-dimensional evaluation set of each subset.
Then, using the normalized evaluation set of each factor to calculate a comprehensive evaluation matrix, specifically comprising:
and (4) adding the two-dimensional disturbance factor again by using the weight obtained in the step 103 and the evaluation set after the normalization of each evaluation subset (factor) to obtain a two-dimensional pole circuit breaker comprehensive evaluation model. After the one-dimensional normalization, the health state of the pole-mounted circuit breaker can be obtained according to the maximum membership principle.
And 106, analyzing and solving the state of the pole top circuit breaker according to the maximum membership principle based on the comprehensive evaluation model and the comprehensive evaluation model to obtain the state of the pole top circuit breaker.
It should be noted that the maximum membership principle is one of basic principles of fuzzy mathematics, and it is a direct method for model identification using fuzzy set theory. For n actual models, it can be expressed as n fuzzy subsets A on the universe of discourse X1，A2…, An, X0 E.X is a specific identifierFor other objects, if i0 ≦ n, let Ai0(x0) = max (a1(x0), a2(x0), …, An (x0)), then x0 is said to be relatively subordinate to Ai0, which is the maximum subordinate principle.
According to the method for evaluating the state of the on-pole circuit breaker, the evaluation index set and the evaluation set for evaluating the state of the on-pole circuit breaker are built, the disturbance fuzzy comprehensive evaluation model of the state of the on-pole circuit breaker is built, the disturbance fuzzy comprehensive evaluation is used as a supplement to a basic evaluation method, and a disturbance fuzzy theory is more reliable for a complex on-pole circuit breaker with more evaluation factors and larger evaluation parameter fluctuation, so that the technical problem of poor evaluation reliability caused by large subjective randomness in the prior art is solved. Further, based on the disturbance fuzzy comprehensive evaluation model constructed by the method, the state of the whole pole-mounted circuit breaker is evaluated by utilizing various measured data of the pole-mounted circuit breaker, so that the staff can be timely helped to find new hidden dangers, and instructive opinions are provided for making corresponding maintenance work.
The following are examples of on-pole breaker state evaluations:
the state of a circuit breaker on a column of model ZW8-12/630-20kA was evaluated. The actual measurement parameters are as follows: has been used for 10 years, and the accumulated action times are up to 450 times, and the relative electric wear degree is known
The curve was found to be 0.71, the vacuum pressure was
pa, humidity around the breaker 200ppm, closing speed
Velocity of moment
The switching-on period is 2.5ms, the switching-off period is 1.6ms, and the insulation resistance is 4200
。
1. Evaluation matrix of pole-mounted circuit breaker
And after the parameter values are respectively substituted into the conversion functions, obtaining an evaluation matrix through a membership function table, wherein the parameters which are not quantized definitely can be obtained through evaluation by experts or experienced persons.
1) Evaluation matrix of breaking wear
Obtaining a membership function table according to the on-off wear
Adding a two-dimensional disturbance quantity into the mixture,
the weight is found by the analytic hierarchy process,
the weight is calculated by the entropy weight method,
the final weight is obtained by using the additive synthesis method,
adding a two-dimensional disturbance quantity into the mixture,
a two-dimensional evaluation matrix is obtained,
the mixture is subjected to one-dimensional treatment to obtain,
and (4) normalizing to obtain the final product,
2) evaluation matrix for insulating media
In the same way, the method can obtain,
3) evaluation matrix of operating parameters
In the same way, the method can obtain,
4) evaluation matrix of working environment
Comprehensive evaluation of 2-column circuit breaker
The product is obtained by the method of 2.3,
then the process of the first step is carried out,
the evaluation result is obtained after adding two-dimensional disturbance quantity according to the actual operation environment of the site on the basis of the two-dimensional disturbance quantity, and the heaviest evaluation result is obtained after one-dimensional operation and normalization. It can be obtained from the maximum membership principle that the maximum 0.3813 belongs to the normal state, but the degree of membership of the state is 0.3075, which is not much different from 0.3813, so that the circuit breaker still needs to be paid more attention. The evaluation reports of the field professionals and the relevant experts also indicate that the pole top circuit breaker is currently in a normal operating state. Therefore, the on-pole circuit breaker state evaluation model based on disturbance fuzzy comprehensive evaluation accords with objective practice.
The above is an embodiment of a method for evaluating a state of a pole top circuit breaker provided in the embodiment of the present application, and the following is an embodiment of a system for evaluating a state of a pole top circuit breaker provided in the embodiment of the present application.
Referring to fig. 2, in an embodiment of the present application, a pole top breaker state evaluation system includes:
the first establishing unit 201 is configured to establish an evaluation index set and an evaluation set for evaluating a state of a circuit breaker on a column, where the evaluation index set includes: the system comprises an on-off wear subset, an insulating medium subset, an operating parameter subset and a working environment subset, wherein the evaluation set comprises: normal state, attention state, abnormal state, severe state;
the second establishing unit 202 is used for respectively establishing membership functions of the on-off wear subset, the insulation medium subset and the operation parameter subset in various states in the evaluation set and establishing an expert evaluation table of the working environment of the on-column circuit breaker;
a first calculating unit 203 for solving the weight of each subset in the evaluation index set by an additive synthesis method;
the second calculation unit 204 is used for respectively inputting the real-time operation parameters of the pole-mounted circuit breaker into the membership function and the expert evaluation table, and solving to obtain a one-dimensional evaluation matrix of the breaking wear, the insulating medium, the operation parameters and the working environment;
a third calculation unit 205, configured to add two-dimensional disturbance factors to each one-dimensional evaluation matrix and each weight, respectively, obtain a one-dimensional comprehensive evaluation matrix of the breaking wear, the insulating medium, the operating parameter, and the working environment, and construct a comprehensive evaluation model of the on-column circuit breaker state based on each one-dimensional comprehensive evaluation matrix;
and the fourth calculating unit 206 is configured to analyze and solve the state of the pole top breaker according to the maximum membership rule based on the comprehensive evaluation model.
The on-pole circuit breaker state evaluation system of this embodiment constructs the fuzzy comprehensive evaluation model of disturbance of on-pole circuit breaker state through the evaluation index set and the evaluation set of building on-pole circuit breaker state aassessment, and the fuzzy comprehensive evaluation of disturbance is as a supplement to basic evaluation method, and to the complicated on-pole circuit breaker that evaluation factor is more, and the evaluation parameter fluctuates greatly, disturbance fuzzy theory is more reliable to solve prior art and lead to the relatively poor technical problem of evaluation reliability because subjective randomness is big. Further, based on the disturbance fuzzy comprehensive evaluation model constructed by the method, the state of the whole pole-mounted circuit breaker is evaluated by utilizing various measured data of the pole-mounted circuit breaker, so that the staff can be timely helped to find new hidden dangers, and instructive opinions are provided for making corresponding maintenance work.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The terms "first," "second," "third," "fourth," and the like in the description of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation 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.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A pole circuit breaker state evaluation method is characterized by comprising the following steps:
the evaluation index set comprises an evaluation index set and an evaluation set for evaluating the state of the circuit breaker on the building column, wherein the evaluation index set comprises: the system comprises an on-off wear subset, an insulating medium subset, an operating parameter subset and a working environment subset, wherein the evaluation set comprises: normal state, attention state, abnormal state, severe state;
respectively establishing membership functions of the on-off wear subset, the insulation medium subset and the operation parameter subset in various states in the evaluation set, and establishing an expert evaluation table of the working environment of the pole-mounted circuit breaker;
solving the weight of each subset in the evaluation index set through an additive synthesis method;
respectively inputting the real-time operation parameters of the pole-mounted circuit breaker into the membership functions and the expert evaluation table, and solving to obtain a one-dimensional evaluation matrix of the breaking wear, the insulating medium, the operation parameters and the working environment;
adding two-dimensional disturbance factors to each one-dimensional evaluation matrix and each weight respectively to obtain one-dimensional comprehensive evaluation matrices of on-off wear, insulating media, operation parameters and working environment, and constructing a comprehensive evaluation model of the on-column breaker state based on each one-dimensional comprehensive evaluation matrix;
and analyzing and solving to obtain the state of the pole-mounted circuit breaker according to a maximum membership principle based on the comprehensive evaluation model.
2. The pole-mounted circuit breaker state evaluation method according to claim 1, wherein the step of adding a two-dimensional disturbance factor to each one-dimensional evaluation matrix and each weight respectively to obtain a one-dimensional comprehensive evaluation matrix of the breaking wear, the insulating medium, the operation parameters and the working environment specifically comprises the steps of:
adding two-dimensional disturbance factors to each one-dimensional evaluation matrix and each weight respectively to obtain a two-dimensional evaluation matrix and a two-dimensional weight of each subset;
and respectively carrying out one-dimensional treatment and normalization treatment on the two-dimensional evaluation matrix and the two-dimensional weight in sequence to obtain a one-dimensional comprehensive evaluation matrix of the breaking wear, the insulating medium, the operation parameters and the working environment.
3. The pole-mounted circuit breaker state evaluation method according to claim 1, wherein the building of the comprehensive evaluation model of the pole-mounted circuit breaker state based on each one-dimensional comprehensive evaluation matrix specifically comprises:
and respectively adding two-dimensional disturbance factors to each one-dimensional comprehensive evaluation matrix again, and sequentially carrying out one-dimensional and normalization processing to obtain the comprehensive evaluation model.
4. The pole-mounted circuit breaker state evaluation method according to claim 1, wherein the constructing of the expert evaluation table of the pole-mounted circuit breaker working environment specifically comprises:
and filling a table by column circuit breaker research experts and field workers to obtain column circuit breaker parameters required by a fuzzy statistical method, and constructing an expert evaluation table of the working environment of the column circuit breaker according to the column circuit breaker parameters.
5. The pole-mounted circuit breaker state evaluation method according to claim 1, wherein the solving of the weight of each subset in the evaluation index set by an additive synthesis method specifically comprises:
the structure of the pole-mounted circuit breaker is divided, and weights of breaking wear, insulating media, operating parameters and working environment are analyzed through an additive synthesis method and normalized to obtain the weights.
6. The pole top breaker state evaluation method of claim 1, wherein the subset of open wear specifically comprises: service life, cumulative number of actions, relative point wear.
7. The pole top breaker state evaluation method of claim 1, wherein the subset of insulating mediums specifically comprises: vacuum pressure, humidity, primary circuit to ground insulation.
8. The pole-mounted circuit breaker state evaluation method according to claim 1, wherein the subset of operating parameters specifically comprises: the switching-on different period, the switching-off different period, the rigid switching-on speed and the rigid switching-off speed.
9. The pole mounted circuit breaker state evaluation method according to claim 1, wherein the working environment subset specifically comprises: and the pollution level of the temperature and humidity environment.
10. A pole top circuit breaker condition evaluation system, comprising:
the first establishing unit is used for establishing an evaluation index set and an evaluation set for evaluating the state of the circuit breaker on the post, and the evaluation index set comprises: the system comprises an on-off wear subset, an insulating medium subset, an operating parameter subset and a working environment subset, wherein the evaluation set comprises: normal state, attention state, abnormal state, severe state;
the second establishing unit is used for respectively establishing membership functions of the on-off wear subset, the insulating medium subset and the operation parameter subset in various states in the evaluation set and establishing an expert evaluation table of the working environment of the on-column circuit breaker;
a first calculating unit for solving the weight of each subset in the evaluation index set by an additive synthesis method;
the second calculation unit is used for respectively inputting the real-time operation parameters of the pole-mounted circuit breaker into the membership functions and the expert evaluation table and solving to obtain a one-dimensional evaluation matrix of the breaking wear, the insulating medium, the operation parameters and the working environment;
the third calculation unit is used for adding two-dimensional disturbance factors to each one-dimensional evaluation matrix and each weight respectively, solving one-dimensional comprehensive evaluation matrices of breaking wear, insulating media, operating parameters and working environment, and constructing a comprehensive evaluation model of the on-column breaker state based on each one-dimensional comprehensive evaluation matrix;
and the fourth calculating unit is used for analyzing and solving the state of the pole top breaker according to the maximum membership principle based on the comprehensive evaluation model.
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| CN115169932A (en) * | 2022-07-20 | 2022-10-11 | 贵州电网有限责任公司 | Comprehensive evaluation method for state of high-voltage circuit breaker |
| CN115728627A (en) * | 2022-10-09 | 2023-03-03 | 上海新联合电气有限公司 | Electric sound contact fault is judgement system in advance |
| CN116609651A (en) * | 2023-07-20 | 2023-08-18 | 山东德源电力科技股份有限公司 | Detection method of multifunctional circuit breaker for photovoltaic |
| CN117335577A (en) * | 2023-12-01 | 2024-01-02 | 国网山东省电力公司莱芜供电公司 | Method and system for monitoring state of pole-mounted switch and controller |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115169932A (en) * | 2022-07-20 | 2022-10-11 | 贵州电网有限责任公司 | Comprehensive evaluation method for state of high-voltage circuit breaker |
| CN115728627A (en) * | 2022-10-09 | 2023-03-03 | 上海新联合电气有限公司 | Electric sound contact fault is judgement system in advance |
| CN116609651A (en) * | 2023-07-20 | 2023-08-18 | 山东德源电力科技股份有限公司 | Detection method of multifunctional circuit breaker for photovoltaic |
| CN117335577A (en) * | 2023-12-01 | 2024-01-02 | 国网山东省电力公司莱芜供电公司 | Method and system for monitoring state of pole-mounted switch and controller |
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