CN115219831A - Distribution transformer insulating oil performance online monitoring method, system, equipment and medium - Google Patents
Distribution transformer insulating oil performance online monitoring method, system, equipment and medium Download PDFInfo
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- CN115219831A CN115219831A CN202210920134.XA CN202210920134A CN115219831A CN 115219831 A CN115219831 A CN 115219831A CN 202210920134 A CN202210920134 A CN 202210920134A CN 115219831 A CN115219831 A CN 115219831A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention provides a method, a system, equipment and a medium for monitoring the performance of insulating oil of a distribution transformer on line, wherein the method comprises the following steps: acquiring insulation oil aging resistance data with preset time duration through an insulation oil aging experiment, and fitting according to the insulation oil aging resistance data to obtain an insulation oil aging resistance model; collecting the resistance value of the insulating oil to be analyzed in real time through an insulating oil resistance monitoring device arranged in the distribution transformer; and (4) setting a corresponding distribution transformer ID mark for the resistance value of the insulating oil to be analyzed, and transmitting the ID mark to a performance analysis server so that the performance analysis server can perform aging analysis according to the resistance value of the insulating oil to be analyzed and an insulating oil aging resistance model to obtain an insulating oil aging evaluation result. The invention realizes the real-time online monitoring of the performance of the insulating oil of the distribution transformer, can sense the aging abnormality of the performance of the insulating oil in time, is convenient for maintenance and processing in time, can effectively reduce the expenditure of labor cost, and provides reliable guarantee for the safe operation of the distribution transformer.
Description
Technical Field
The invention relates to the technical field of distribution transformer operation and maintenance, in particular to a distribution transformer insulating oil performance online monitoring method, a distribution transformer insulating oil performance online monitoring system, computer equipment and a storage medium.
Background
The distribution transformer is one of important electric devices for electric energy transmission in a power grid, and the safe and stable operation of the distribution transformer is the key of the stability of the power grid. The insulating oil with large specific heat capacity is adopted as a coolant in the current distribution transformer, when the distribution transformer operates, an iron core winding generates heat, the insulating oil rises due to thermal expansion and can cause the upper and lower convection of the insulating oil, the insulating oil has good heat-conducting property, a large amount of gas can be decomposed under the action of high temperature of electric arc, and the heat in the distribution transformer is dissipated by a radiator, so that the normal operation of the transformer can be ensured. However, most distribution transformers are installed in an open air environment, the quality of the insulating oil is gradually deteriorated due to the contact between the insulating oil and air and the influence of high operation temperature of the equipment, when the insulating property of the insulating oil does not meet the requirement, the insulating oil cannot insulate and cool the iron core, the winding and the like, the short circuit damage of the transformer can be caused seriously, and in order to prevent the influence on the safe operation due to the deterioration of the oil, it is very necessary to monitor the performance of the insulating oil of the normally operated distribution transformer.
The existing method for monitoring the insulating oil performance of the distribution transformer mainly comprises the steps of manually and periodically collecting and analyzing the insulating oil of the distribution transformer, needing a worker to perform power failure sampling at intervals, analyzing and monitoring the collected sample, not only needing to invest a large amount of labor cost, but also being incapable of monitoring the performance of the insulating oil timely and accurately, namely when the insulating performance of the insulating oil goes wrong, the insulating oil cannot be monitored at the first time, and the fault risk of the distribution transformer cannot be really and effectively avoided.
Disclosure of Invention
The invention aims to provide an on-line monitoring method for the insulating oil performance of a distribution transformer, which is characterized in that an insulating oil resistance monitoring device is arranged in the distribution transformer to collect insulating oil resistance in real time, and an insulating oil aging resistance model obtained by a double-temperature aging experiment is combined, so that the real-time on-line monitoring for the insulating oil performance of the distribution transformer is realized, the technical defect of the existing insulating aging assessment is effectively overcome, the abnormal aging of the insulating oil performance can be sensed in time, the timely maintenance and treatment are convenient, the labor cost overhead can be effectively reduced, and the reliable guarantee is provided for the safe operation of the distribution transformer.
In order to achieve the above object, it is necessary to provide a method, a system, a computer device and a storage medium for online monitoring of insulating oil performance of a distribution transformer, which aim at the above technical problems.
In a first aspect, an embodiment of the present invention provides an online monitoring method for insulating oil performance of a distribution transformer, where the method includes the following steps:
acquiring insulation oil aging resistance data with preset time duration through an insulation oil aging experiment, and fitting according to the insulation oil aging resistance data to obtain an insulation oil aging resistance model; the insulation oil aging resistance data comprises insulation oil resistance values corresponding to different insulation oil aging durations;
collecting the resistance value of the insulating oil to be analyzed in real time through an insulating oil resistance monitoring device arranged in the distribution transformer;
and setting a corresponding distribution transformer ID mark for the resistance value of the insulating oil to be analyzed, and transmitting the ID mark to a performance analysis server, so that the performance analysis server performs aging analysis according to the resistance value of the insulating oil to be analyzed and an insulating oil aging resistance model to obtain an insulating oil aging evaluation result.
Further, the insulating oil aging experiment is an insulating oil dual-temperature aging experiment;
through the insulating oil aging experiment, the step of obtaining insulating oil aging resistance data for a preset time includes:
and respectively adopting an insulating oil resistance monitoring device and a resistance monitoring instrument, and collecting insulating oil aging resistance data with preset time at equal intervals according to the preset aging time.
Further, the step of collecting the resistance value of the insulating oil to be analyzed in real time through the built-in insulating oil resistance monitoring device of the distribution transformer comprises:
immersing the insulating oil resistance monitoring device in insulating oil of a distribution transformer, and sequentially collecting the preset number of insulating oil resistance values;
and acquiring an arithmetic mean value of the preset number of the insulation oil resistance values, and taking the arithmetic mean value as the insulation oil resistance value to be analyzed.
Further, the step of immersing the insulating oil resistance monitoring device in insulating oil of a distribution transformer and sequentially collecting the preset number of insulating oil resistance values comprises:
acquiring a reference voltage signal and a line voltage signal according to a pre-constructed signal monitoring circuit;
and D/A conversion is carried out on the reference voltage signal and the line voltage signal, and the resistance value of the insulating oil is obtained through calculation.
Further, the signal monitoring circuit comprises a voltage input end, and a first resistor and a second resistor which are connected with two ends of the voltage input end in series; the voltage regulator also comprises a third resistor and a fourth resistor which are connected with the two ends of the voltage input end in series; the first resistor and the third resistor are indirectly connected into the electrode plate; a first voltage sensor is connected between the first resistor and the second resistor; a second voltage sensor is connected between the third resistor and the fourth resistor; the electrode plates are stainless steel plates with preset sizes and are arranged in a crossed mode according to the positive electrode and the negative electrode.
Further, the step of performing aging analysis according to the insulation oil resistance value to be analyzed and the insulation oil aging resistance model to obtain an insulation oil aging evaluation result includes:
judging whether the resistance value of the insulating oil to be analyzed is larger than a minimum resistance threshold value or not, if so, acquiring the running time of the distribution transformer according to the corresponding ID mark of the distribution transformer;
inputting the running time of the distribution transformer into the insulating oil aging resistance model to obtain an insulating oil fitting resistance value;
the electric resistance value of the insulating oil to be analyzed is differed from the fitting resistance value of the insulating oil to obtain a resistance difference value;
and judging whether the resistance difference value is within a preset difference value range, if so, judging that the insulation oil aging evaluation result is normal performance aging, otherwise, judging that the insulation oil aging evaluation result is abnormal performance aging.
In a second aspect, an embodiment of the present invention provides an online monitoring system for performance of insulating oil of a distribution transformer, where the system includes:
the aging experiment module is used for acquiring insulation oil aging resistance data with preset time through an insulation oil aging experiment, and fitting to obtain an insulation oil aging resistance model according to the insulation oil aging resistance data; the insulation oil aging resistance data comprises insulation oil resistance values corresponding to different insulation oil aging durations;
the device comprises an insulating oil resistance monitoring device, a performance analysis server and a data processing device, wherein the insulating oil resistance monitoring device is used for acquiring the resistance value of the insulating oil to be analyzed of the distribution transformer, setting the corresponding ID mark of the distribution transformer to the resistance value of the insulating oil to be analyzed and transmitting the ID mark to the performance analysis server;
and the performance analysis server is used for carrying out aging analysis according to the insulation oil resistance value to be analyzed and the insulation oil aging resistance model to obtain an insulation oil aging evaluation result.
Furthermore, the insulating oil resistance monitoring device comprises a signal monitoring module and a main control module connected with the output end of the signal monitoring module;
the signal monitoring module is used for acquiring a reference voltage signal and a line voltage signal according to a pre-constructed signal monitoring circuit and transmitting the reference voltage signal and the line voltage signal to the main control module;
and the main control module is used for performing digital-to-analog conversion on the reference voltage signal and the line voltage signal and calculating to obtain the resistance value of the insulating oil.
In a third aspect, an embodiment of the present invention further provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the method when executing the computer program.
In a fourth aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the steps of the above method.
The application provides a distribution transformer insulating oil performance online monitoring method, a distribution transformer insulating oil performance online monitoring system, computer equipment and a storage medium, and the method is used for acquiring insulating oil aging resistance data with preset time duration through an insulating oil aging experiment, acquiring the insulating oil resistance value to be analyzed in real time through an insulating oil resistance monitoring device arranged in a distribution transformer after an insulating oil aging resistance model is obtained according to the insulating oil aging resistance data fitting, transmitting a distribution transformer ID mark corresponding to the insulating oil resistance value setting to be analyzed to a performance analysis server, and performing aging analysis by the performance analysis server according to the insulating oil resistance value to be analyzed and the insulating oil aging resistance model to obtain a technical scheme of an insulating oil aging evaluation result. Compared with the prior art, the method for monitoring the insulating oil performance of the distribution transformer on line realizes real-time on-line monitoring of the insulating oil performance of the distribution transformer, can sense the aging abnormality of the insulating oil performance in time, is convenient for maintenance and processing in time, can effectively reduce the labor cost overhead, and provides reliable guarantee for the safe operation of the distribution transformer.
Drawings
FIG. 1 is a schematic flow chart of a method for monitoring the performance of insulating oil of a distribution transformer on line in an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a signal monitoring circuit of the device for monitoring the performance of the insulating oil according to the embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an online monitoring system for the performance of the insulating oil of the distribution transformer in the embodiment of the invention;
FIG. 4 is a schematic view of the structure of the insulation oil resistance monitoring device in FIG. 3;
fig. 5 is an internal structural diagram of a computer device in the embodiment of the present invention.
Detailed Description
In order to make the purpose, technical solution and advantages of the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments, and it is obvious that the embodiments described below are part of the embodiments of the present invention, and are used for illustrating the present invention only, but not for limiting the scope of the present invention. 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 invention.
The distribution transformer insulating oil performance online monitoring method provided by the invention can be applied to an independent server or a server cluster consisting of a plurality of servers. The server obtains the electric resistance value of the insulating oil by receiving real-time online monitoring transmitted by insulating oil resistance monitoring devices arranged in the distribution transformers, aging evaluation is carried out on the insulating oil performance of the distribution transformers according to the online monitoring method for the insulating oil performance of the distribution transformers provided by the invention, and the corresponding insulating aging evaluation result is fed back to operation and maintenance personnel in time, so that the distribution transformer equipment is convenient to maintain in time, and the safe operation of the distribution transformer equipment is effectively ensured; the following examples will illustrate the method for monitoring the insulating oil performance of the distribution transformer on line according to the present invention.
In one embodiment, as shown in fig. 1, there is provided an online monitoring method for insulating oil performance of a distribution transformer, comprising the following steps:
s11, obtaining insulation oil aging resistance data with preset time through an insulation oil aging experiment, and fitting according to the insulation oil aging resistance data to obtain an insulation oil aging resistance model; the insulation oil aging resistance data comprises insulation oil resistance values corresponding to different insulation oil aging durations; the insulating oil aging experiment is an insulating oil dual-temperature aging experiment, and can be understood as an aging simulation experiment performed on insulating oil according to the rule that the insulating oil of a distribution transformer gradually ages along with the service time of the distribution transformer, wherein in the simulation experiment, the insulating resistance value of the insulating oil is collected at intervals; specifically, through the insulating oil aging experiment, the step of obtaining insulating oil aging resistance data for a preset time includes:
respectively adopting an insulating oil resistance monitoring device and a resistance monitoring instrument, and collecting insulating oil aging resistance data with preset time at equal intervals according to the preset aging time; the preset time and the preset aging time interval can be set according to actual application requirements, in order to guarantee accurate effectiveness of the insulating oil aging resistance model obtained through fitting, the longer the preset time is, the better the preset aging time interval is, the shorter the preset aging time interval is, and the specific limitation on the preset time and the preset aging time interval is not made.
The resistance monitoring instrument used in the insulating oil aging experiment in the embodiment can be understood as a special resistance monitoring instrument used in the existing laboratory, and power failure oil taking test is needed when the special resistance monitoring instrument is used, while the insulating oil resistance monitoring device is a resistance monitoring device which is specially designed and can be installed in a distribution transformer for use, and a designed signal monitoring circuit shown in fig. 2 has the same resistance measurement precision as the special resistance monitoring instrument. The following description is given by taking the example that the preset time is 3000 hours when simulating the insulation performance of each stage of about 20 years of the insulation oil used in the distribution transformer, and the corresponding insulation oil resistance is acquired at intervals according to the preset aging time of 150 hours, and the resistance data of the insulation oil is acquired by a special resistance monitoring instrument and an insulation oil resistance monitoring device at the same time every 150 hours in a double-temperature aging simulation test, corresponding to the insulation oil aging degree of the distribution transformer when the distribution transformer works for one year, so as to obtain the insulation oil aging resistance data shown in table 1. Based on the data in table 1, it can be seen that the resistance value acquired by the insulating oil resistance monitoring device is similar to the resistance value data acquired by a special resistance monitoring instrument and conforms to the same trend rule, so that the reliability of the insulating oil resistance monitoring device built in a distribution transformer for real-time online monitoring of the internal insulating oil resistance of the distribution transformer is effectively proved, and meanwhile, the insulating oil aging resistance model obtained by fitting the insulating oil aging resistance data obtained by using a double-temperature aging experiment is proved to be reliable and effective, so that the insulating oil aging resistance model has practical significance.
TABLE 1 insulating oil aging resistance data for 20 years obtained from a two-temperature aging simulation test
As described above, in the insulation oil aging resistance data obtained through simulation of the insulation oil aging experiment, the insulation oil aging time and the corresponding resistance value data have a certain linear relationship, and a corresponding insulation oil aging resistance model can be obtained by fitting the insulation oil aging time and the corresponding resistance value data. It should be noted that, here, the fitting data of the insulation oil aging resistance model may be only resistance value data measured by the insulation oil resistance monitoring device, or only resistance value data measured by the resistance monitoring instrument, and in order to ensure the generalization ability of the insulation oil aging resistance model, in this embodiment, it is preferable to perform fitting analysis by using both the resistance value data measured by the insulation oil resistance monitoring device and the resistance value data measured by the resistance monitoring instrument as fitting data, and the obtained insulation oil aging resistance model is as follows:
Y＝a*X 3 +b*X 2 +c*X+e
wherein Y represents an insulation oil aging resistance; x represents the aging time of the insulating oil; a. b and c represent a cubic term coefficient, a quadratic term coefficient and a primary term coefficient, respectively; e represents a constant term; it should be noted that the fitting model is only an exemplary description, and in practical applications, the independent variable in the fitted model may have a higher order or may be lower than 3 orders, which is not specifically limited herein; the model given above is only for the insulation oil aging resistance data shown in table 1, and the corresponding model coefficients are: a =1E-07, b =0.0004, c = -7.3924, E = -22474.
S12, collecting the resistance value of the insulating oil to be analyzed in real time through an insulating oil resistance monitoring device arranged in the distribution transformer; the insulating oil resistance monitoring device is arranged for each distribution transformer, and needs to be immersed in insulating oil of the distribution transformer in the using process. Correspondingly, the resistance value of the insulating oil to be analyzed can be understood as the resistance value of the insulating oil in the installed distribution transformer, which is acquired by the insulating oil resistance monitoring device at each monitoring moment, and can be directly used for subsequent insulating oil aging evaluation; specifically, the step of collecting the resistance value of the insulating oil to be analyzed in real time through the built-in insulating oil resistance monitoring device of the distribution transformer comprises:
immersing the insulating oil resistance monitoring device in insulating oil of a distribution transformer, and sequentially collecting the preset number of insulating oil resistance values; the acquisition of the resistance value of the insulating oil is realized based on a signal monitoring circuit shown in fig. 2, and the specific acquisition process comprises the following steps:
acquiring a reference voltage signal and a line voltage signal according to a pre-constructed signal monitoring circuit; the signal monitoring circuit comprises a voltage input end UO, and a first resistor R1 and a second resistor R2 which are connected with two ends of the voltage input end UO in series; the voltage regulator also comprises a third resistor R3 and a fourth resistor R4 which are connected with the two ends of the voltage input end UO in series; the first resistor R1 and the third resistor R3 are indirectly connected to the electrode piece DJ; a first voltage sensor used for acquiring a reference voltage signal Uref is connected between the first resistor R1 and the second resistor R2; a second voltage sensor used for acquiring a line voltage signal Ux is connected between the third resistor R3 and the fourth resistor R4; the electrode plate DJ is a stainless steel sheet with a preset size, and the stainless steel sheets are arranged in a crossed manner according to the positive electrode and the negative electrode, preferably, in the embodiment, 10 stainless steel sheets with the length, the width and the thickness of 10cm and 1mm are arranged and overlapped in a crossed manner according to the positive electrode and the negative electrode, so that the effective electrode area is 0.05 square meter; meanwhile, the two sides of the electrode are fixed by plastic, so that the two sides of the electrode are not short-circuited with each other, and the electrode interval is 1mm or 2mm.
Performing digital-to-analog conversion on the reference voltage signal and the line voltage signal, and calculating to obtain an insulation oil resistance value;
the working principle of the signal monitoring circuit can be understood as that a fixed direct-current voltage (voltage value is not limited) is applied to a voltage input end Uo through an external power supply module, a reference voltage signal Uref between a first resistor R1 and a second resistor R2 is obtained through a first voltage sensor, after a line voltage signal Ux between a third resistor R3 and a fourth resistor R4 is obtained through a second voltage sensor, the reference voltage signal Uref and the line voltage signal Ux are subjected to digital-to-analog conversion to obtain a corresponding reference voltage Uref and a corresponding line voltage Ux, and the insulation oil resistance value at a corresponding moment can be obtained according to the known Uo, R1, R2, R3 and R4 by adopting the following formula:
wherein R is x The electrode DJ is connected with the equivalent resistance formed by insulating oil;
acquiring an arithmetic mean value of the preset number of insulation oil resistance values, and taking the arithmetic mean value as the insulation oil resistance value to be analyzed; the arithmetic mean value calculation process can be understood as sorting the collected preset number of insulation oil resistance values, and taking the mean value of the residual insulation oil resistance values after removing the maximum value and the minimum value; it should be noted that, the preset number of resistance values of the insulating oil are collected each time, and the preset number of resistance values are mainly used for performing debounce filtering processing on data, so that the resistance values for the insulating aging analysis have stability and accuracy, wherein the preset number of values can be set according to actual application requirements, and the preset number of values is not limited here.
S13, setting a distribution transformer ID mark corresponding to the resistance value of the insulating oil to be analyzed, and transmitting the distribution transformer ID mark to a performance analysis server so that the performance analysis server can perform aging analysis according to the resistance value of the insulating oil to be analyzed and an insulating oil aging resistance model to obtain an insulating oil aging evaluation result; the ID marks of the distribution transformers are in one-to-one correspondence with the distribution transformers, the performance analysis server is used for maintaining operation information including operation time of each distribution transformer, a one-to-many relationship exists between the performance analysis server and the distribution transformers, and the corresponding operation information can be obtained through real-time inquiry according to the ID marks of the distribution transformers. In order to facilitate the performance analysis server to carry out targeted analysis on the insulation oil aging of each distribution transformer, the insulation oil resistance monitoring device needs to mark the ID of the corresponding distribution transformer before transmitting the measured insulation oil resistance value to be analyzed to the performance server through the wireless communication module for the performance analysis server to distinguish the insulation oil resistance value to be analyzed of each distribution transformer;
specifically, the step of performing aging analysis according to the insulation oil resistance value to be analyzed and the insulation oil aging resistance model to obtain an insulation oil aging evaluation result includes:
judging whether the resistance value of the insulating oil to be analyzed is larger than a minimum resistance threshold value or not, if so, acquiring the running time of the distribution transformer according to the corresponding ID mark of the distribution transformer; the running time of the distribution transformer needs to be consistent with the time unit in the insulation oil aging resistance model, and the running time of the distribution transformer is counted by years generally, so that the running time of the distribution transformer obtained according to the ID mark of the distribution transformer needs to be converted into the time unit of the insulation oil aging resistance model, namely, according to the conversion rule in the insulation oil aging experiment, one year is converted into the corresponding 150 hours to obtain the corresponding running time of the distribution transformer for use;
inputting the running time of the distribution transformer into the insulating oil aging resistance model to obtain an insulating oil fitting resistance value;
the electric resistance value of the insulating oil to be analyzed is differed from the fitting resistance value of the insulating oil to obtain a resistance difference value;
and judging whether the resistance difference value is within a preset difference value range, if so, judging that the insulation oil aging evaluation result is normal performance aging, otherwise, judging that the insulation oil aging evaluation result is abnormal performance aging.
It should be noted that, the minimum resistance threshold and the preset difference range may be set according to the actual performance aging requirement of the insulating oil, and are not specifically limited herein;
the performance analysis server can realize real-time online insulation oil performance aging evaluation on all distribution transformers managed by the performance analysis server through the method, the insulation oil aging evaluation result is normal in performance aging and does not need any processing, and the insulation oil aging evaluation result is abnormal in performance aging, abnormal aging early warning needs to be sent to related operation and maintenance personnel to specify the insulation oil of the distribution transformer, so that the operation and maintenance personnel can maintain the distribution transformer in time, and the operation safety of the distribution transformer is effectively guaranteed.
In one embodiment, as shown in fig. 3, there is provided an online monitoring system for the performance of distribution transformer insulating oil, the system comprising:
the aging experiment module 1 is used for acquiring insulation oil aging resistance data with preset time through an insulation oil aging experiment, and fitting the insulation oil aging resistance data to obtain an insulation oil aging resistance model; the insulation oil aging resistance data comprises insulation oil resistance values corresponding to different insulation oil aging durations;
the insulating oil resistance monitoring device 2 is used for acquiring the resistance value of the insulating oil to be analyzed of the distribution transformer, setting the corresponding ID mark of the distribution transformer to the resistance value of the insulating oil to be analyzed, and transmitting the ID mark to the performance analysis server;
and the performance analysis server 3 is used for carrying out aging analysis according to the insulation oil resistance value to be analyzed and the insulation oil aging resistance model to obtain an insulation oil aging evaluation result.
Specifically, as shown in fig. 4, the insulating oil resistance monitoring device 2 includes a signal monitoring module 21, and a main control module 22 connected to an output end of the signal monitoring module 21;
the signal monitoring module 21 is configured to obtain a reference voltage signal and a line voltage signal according to a pre-constructed signal monitoring circuit, and transmit the reference voltage signal and the line voltage signal to the main control module; the signal monitoring circuit is shown in fig. 2, and the specific circuit structure refers to the description of the above method, which is not described herein again;
and the main control module 22 is configured to perform digital-to-analog conversion on the reference voltage signal and the line voltage signal, and calculate to obtain the resistance value of the insulating oil.
For specific limitations of the online monitoring system for the insulating oil performance of the distribution transformer, reference may be made to the above limitations of the online monitoring method for the insulating oil performance of the distribution transformer, and details are not repeated here. All or part of all modules in the on-line monitoring system for the performance of the insulating oil of the distribution transformer can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
Fig. 5 shows an internal structure diagram of a computer device in one embodiment, and the computer device may be specifically a terminal or a server. As shown in fig. 5, the computer apparatus includes a processor, a memory, a network interface, a display, and an input device, which are connected through a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operating system and the computer program to run on the non-volatile storage medium. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to realize the online monitoring method for the insulating oil performance of the distribution transformer. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those of ordinary skill in the art that the architecture shown in FIG. 5 is a block diagram of only a portion of the architecture associated with the subject application, and is not intended to limit the computing devices to which the subject application may be applied, as a particular computing device may include more or less components than those shown, or may combine certain components, or have a similar arrangement of components.
In one embodiment, a computer device is provided, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the steps of the above method being performed when the computer program is executed by the processor.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the above-mentioned method.
To sum up, the method for monitoring the insulating oil performance of the distribution transformer on line, the system, the computer device and the storage medium provided by the embodiment of the invention, the insulating oil aging resistance data with the preset time duration is obtained through the insulating oil aging experiment, after the insulating oil aging resistance model is obtained according to the insulating oil aging resistance data fitting, the insulating oil resistance value to be analyzed is collected in real time through the insulating oil resistance monitoring device built in the distribution transformer, the distribution transformer ID mark corresponding to the setting of the insulating oil resistance value to be analyzed is transmitted to the performance analysis server, and the aging analysis is carried out by the performance analysis server according to the insulating oil resistance value to be analyzed and the insulating oil aging resistance model, so as to obtain the technical scheme of the insulating oil aging evaluation result.
The embodiments in this specification are described in a progressive manner, and all the same or similar parts of the embodiments are directly referred to each other, and each embodiment is described with emphasis on differences from other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment. It should be noted that, the technical features of the embodiments may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express some preferred embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these should be construed as the protection scope of the present application. Therefore, the protection scope of the present patent shall be subject to the protection scope of the claims.
Claims (10)
1. The method for monitoring the performance of the insulating oil of the distribution transformer on line is characterized by comprising the following steps of:
acquiring insulation oil aging resistance data with preset time duration through an insulation oil aging experiment, and fitting according to the insulation oil aging resistance data to obtain an insulation oil aging resistance model; the insulation oil aging resistance data comprises insulation oil resistance values corresponding to different insulation oil aging durations;
collecting the resistance value of the insulating oil to be analyzed in real time through an insulating oil resistance monitoring device arranged in the distribution transformer;
and setting a corresponding distribution transformer ID mark for the resistance value of the insulating oil to be analyzed, and transmitting the ID mark to a performance analysis server, so that the performance analysis server performs aging analysis according to the resistance value of the insulating oil to be analyzed and an insulating oil aging resistance model to obtain an insulating oil aging evaluation result.
2. The method for monitoring the performance of the insulating oil of the distribution transformer on line according to claim 1, wherein the insulating oil aging experiment is an insulating oil dual-temperature aging experiment;
through the insulating oil aging experiment, the step of obtaining insulating oil aging resistance data for a preset time includes:
and respectively adopting an insulating oil resistance monitoring device and a resistance monitoring instrument, and collecting insulating oil aging resistance data with preset time length at equal intervals according to the preset time length of aging.
3. The method for monitoring the performance of the insulating oil of the distribution transformer in the online manner as claimed in claim 2, wherein the step of collecting the resistance value of the insulating oil to be analyzed in real time by using the insulating oil resistance monitoring device built in the distribution transformer comprises the steps of:
immersing the insulating oil resistance monitoring device in insulating oil of a distribution transformer, and sequentially collecting the preset number of insulating oil resistance values;
and acquiring an arithmetic mean value of the preset number of the insulation oil resistance values, and taking the arithmetic mean value as the insulation oil resistance value to be analyzed.
4. The method for on-line monitoring of insulating oil performance of distribution transformer of claim 3, wherein the step of immersing the insulating oil resistance monitoring device in insulating oil of distribution transformer, and sequentially collecting a predetermined number of insulating oil resistance values comprises:
acquiring a reference voltage signal and a line voltage signal according to a pre-constructed signal monitoring circuit;
and D/A conversion is carried out on the reference voltage signal and the line voltage signal, and the resistance value of the insulating oil is obtained through calculation.
5. The method according to claim 4, wherein the signal monitoring circuit comprises a voltage input, a first resistor and a second resistor connected in series with the voltage input; the voltage regulator also comprises a third resistor and a fourth resistor which are connected with the two ends of the voltage input end in series; the first resistor and the third resistor are indirectly connected into the electrode plate; a first voltage sensor is connected between the first resistor and the second resistor; a second voltage sensor is connected between the third resistor and the fourth resistor; the electrode plates are stainless steel plates with preset sizes and are arranged in a crossed mode according to the positive electrode and the negative electrode.
6. The method for monitoring the insulating oil performance of the distribution transformer in the online manner as claimed in claim 1, wherein the step of performing aging analysis according to the insulating oil resistance value to be analyzed and the insulating oil aging resistance model to obtain the insulating oil aging evaluation result comprises the steps of:
judging whether the resistance value of the insulating oil to be analyzed is larger than a minimum resistance threshold value or not, if so, acquiring the running time of the distribution transformer according to the corresponding ID mark of the distribution transformer;
inputting the running time of the distribution transformer into the insulating oil aging resistance model to obtain an insulating oil fitting resistance value;
the electric resistance value of the insulating oil to be analyzed is differed from the fitting resistance value of the insulating oil to obtain a resistance difference value;
and judging whether the resistance difference value is within a preset difference value range, if so, judging that the insulation oil aging evaluation result is normal performance aging, otherwise, judging that the insulation oil aging evaluation result is abnormal performance aging.
7. An on-line monitoring system for the performance of insulating oil of a distribution transformer, which is characterized by comprising:
the aging experiment module is used for acquiring insulation oil aging resistance data with preset time through an insulation oil aging experiment, and fitting according to the insulation oil aging resistance data to obtain an insulation oil aging resistance model; the insulation oil aging resistance data comprises insulation oil resistance values corresponding to different insulation oil aging durations;
the device comprises an insulating oil resistance monitoring device, a performance analysis server and a data processing device, wherein the insulating oil resistance monitoring device is used for acquiring the resistance value of the insulating oil to be analyzed of the distribution transformer, setting the corresponding ID mark of the distribution transformer to the resistance value of the insulating oil to be analyzed and transmitting the ID mark to the performance analysis server;
and the performance analysis server is used for carrying out aging analysis according to the insulation oil resistance value to be analyzed and the insulation oil aging resistance model to obtain an insulation oil aging evaluation result.
8. The on-line monitoring system for the performance of the insulating oil of the distribution transformer according to claim 7, wherein the insulating oil resistance monitoring device comprises a signal monitoring module and a main control module connected with the output end of the signal monitoring module;
the signal monitoring module is used for acquiring a reference voltage signal and a line voltage signal according to a pre-constructed signal monitoring circuit and transmitting the reference voltage signal and the line voltage signal to the main control module;
and the main control module is used for performing digital-to-analog conversion on the reference voltage signal and the line voltage signal and calculating to obtain the resistance value of the insulating oil.
9. A computer arrangement comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method as claimed in any one of claims 1 to 6 when executing the computer program.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 6.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116773987A (en) * | 2023-08-24 | 2023-09-19 | 北京中联太信科技有限公司 | Insulation level monitoring's on-line control system |
| CN117890827A (en) * | 2024-03-15 | 2024-04-16 | 江苏沃能电气科技有限公司 | Intelligent monitoring system for operation of insulated tubular bus based on visualization |
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2022
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116773987A (en) * | 2023-08-24 | 2023-09-19 | 北京中联太信科技有限公司 | Insulation level monitoring's on-line control system |
| CN116773987B (en) * | 2023-08-24 | 2023-10-31 | 北京中联太信科技有限公司 | Insulation level monitoring's on-line control system |
| CN117890827A (en) * | 2024-03-15 | 2024-04-16 | 江苏沃能电气科技有限公司 | Intelligent monitoring system for operation of insulated tubular bus based on visualization |
| CN117890827B (en) * | 2024-03-15 | 2024-05-17 | 江苏沃能电气科技有限公司 | Intelligent monitoring system for operation of insulated tubular bus based on visualization |
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