CN115248402A - Oil immersed transformer on-line monitoring system and method - Google Patents
Oil immersed transformer on-line monitoring system and method Download PDFInfo
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- CN115248402A CN115248402A CN202210805317.7A CN202210805317A CN115248402A CN 115248402 A CN115248402 A CN 115248402A CN 202210805317 A CN202210805317 A CN 202210805317A CN 115248402 A CN115248402 A CN 115248402A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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Abstract
The scheme relates to an oil immersed transformer on-line monitoring system and method. The system comprises an information acquisition terminal and an equipment operation and maintenance center; the information acquisition terminal is interconnected with the equipment operation and maintenance center; the information acquisition terminal comprises an oil temperature acquisition unit, an environmental parameter acquisition unit, an oil online acquisition unit and a load current acquisition unit; the equipment operation and maintenance center comprises a signal acquisition server, a data analysis station, an equipment monitoring and diagnosing platform and a remote terminal. The oil temperature signal, the environmental parameter, the gas and micro-water data and the load current signal of the oil immersed transformer are collected and extracted in real time, and data analysis is carried out through the signal collection server, the data analysis station and the equipment monitoring and diagnosing platform, so that the abnormity of the oil immersed transformer can be timely and accurately found, the abnormity type can be diagnosed, the operation and maintenance cost is reduced, and the operation and maintenance efficiency is improved.
Description
Technical Field
The invention relates to the technical field of on-line monitoring of power equipment, in particular to an on-line monitoring system and method for an oil immersed transformer.
Background
The transformer is one of key equipment in a power system, bears the functions of voltage transformation, electric energy distribution, transmission and the like, and is the most key link in a power transmission and transformation system. The health level and the operating condition of the transformer directly affect the safe operation of the whole power system. The national industry standard stipulates the temperature rise limit values of transformer windings, iron cores and power transformer oil, but in the actual operation of the oil immersed transformer, because of the influence of the design and manufacturing process quality, heat dissipation, operation environment, operation maintenance and other reasons, especially under the working conditions of different load rates of the power transformer, the temperature rise of the transformer changes greatly, and the equipment state cannot be accurately grasped only through the temperature rise threshold value.
At present, when equipment personnel regularly carry out oil immersed transformer inspection, the mode of patrolling and examining is basically adopted to judge, and the precision is low, and work load is big, is unfavorable for long-term equipment management, can't in time discover hidden danger and defect that equipment exists. Due to the fact that the design of the oil immersed transformer is complex, key characteristic quantities are various, fault characteristics are not obvious, and it is very difficult to accurately judge the running state, the fault type and the potential hidden danger of the oil immersed transformer in real time.
Disclosure of Invention
Therefore, in order to solve the technical problems, the oil immersed transformer online monitoring system and the oil immersed transformer online monitoring method are provided, so that the abnormality of the oil immersed transformer can be timely and accurately found, the abnormality type can be diagnosed, the operation and maintenance cost is reduced, and the operation and maintenance efficiency is improved.
An oil immersed transformer on-line monitoring system comprises an information acquisition terminal and an equipment operation and maintenance center; the information acquisition terminal is interconnected with the equipment operation and maintenance center; the information acquisition terminal comprises an oil temperature acquisition unit, an environmental parameter acquisition unit, an oil online acquisition unit and a load current acquisition unit; wherein:
the oil temperature acquisition unit is used for acquiring an upper layer oil temperature signal of the oil immersed transformer;
the environment parameter acquisition unit is used for detecting the environment parameters of the oil immersed transformer;
the oil online acquisition unit is used for acquiring gas and micro-water data in the oil immersed transformer oil;
the load current acquisition unit is used for acquiring a load current signal in the oil-immersed transformer;
the equipment operation and maintenance center comprises a signal acquisition server, a data analysis station, an equipment monitoring and diagnosis platform and a remote terminal; wherein:
the signal acquisition server is connected with the oil temperature acquisition unit, the environment parameter acquisition unit, the oil online acquisition unit and the load current acquisition unit and is used for receiving the upper oil temperature signal, the environment parameters, the gas and micro-water data and the load current signal transmitted from the information acquisition terminal;
the data analysis station is connected with the signal acquisition server and is used for data communication management, data storage management and comprehensive diagnosis of the state information of the oil immersed transformer;
the equipment monitoring and diagnosing platform is connected with the data analysis station and is used for configuring an equipment tree and basic information, displaying state information of the oil immersed transformer, managing alarm events and configuring user permission;
and the remote terminal is connected with the equipment monitoring and diagnosing platform and used for displaying the state information of the oil immersed transformer.
In one embodiment, the environment parameter acquisition unit includes a temperature sensor, a pressure sensor, and a humidity sensor, and is configured to detect temperature data, pressure data, and humidity data of an environment where the oil-immersed transformer is located, and use the detected temperature data, pressure data, and humidity data as the environment parameter.
In one embodiment, the oil online acquisition unit comprises an oil-gas separation unit, a micro-water detection unit and a gas detection unit; the oil-gas separation unit is used for separating dissolved gas in transformer oil in the oil-immersed transformer; the micro-water detection unit is used for detecting the micro-water content in the transformer oil in the oil immersed transformer; the gas detection unit is used for detecting each component and concentration of the dissolved gas.
In one embodiment, the gas detection unit comprises a signal module, a laser control and protection module, a laser, an absorption cell, a photoelectric detection module, a harmonic detection module and a filtering module.
In one embodiment, the information acquisition terminal further comprises a high-voltage switch comprehensive protection system; and the load current acquisition unit transmits the load current signal to the signal acquisition server through the high-voltage switch comprehensive protection system.
In one embodiment, the data analysis station comprises a data communication module, a data storage module and a state information comprehensive diagnosis module; the data communication module is used for analyzing different types of data, merging each data to a corresponding measuring point respectively and finishing the association between the measuring points and the data; the data storage module is used for performing real-time storage, temporary storage and persistent storage on data according to data types; and the state information comprehensive diagnosis module is used for calculating the data characteristic quantity and analyzing and judging the state information of the oil immersed transformer.
In one embodiment, the equipment monitoring and diagnosing platform comprises a display module, an alarm module, a user authority management module, a data analysis module and an interface extension module; the display module is used for displaying the state information of the oil immersed transformer; the alarm module is used for setting equipment attribution and statistical rules of alarm and generating alarm information; the user authority management module is used for adding, modifying and deleting users and distributing different roles to the users; the data analysis module is used for carrying out numerical analysis and signal analysis on the data transmitted in the information acquisition terminal; the interface extension module is used for providing an extension interface.
An oil immersed transformer online monitoring method, the method comprising:
the method comprises the steps that an information acquisition terminal acquires parameter data of the oil immersed transformer and sends the parameter data to a signal acquisition server;
the signal acquisition server receives the parameter data, monitors the parameter data in real time through a communication link, and sends the parameter data to a data analysis station;
the data analysis station stores the parameter data, performs data analysis on the parameter data, corresponds the analyzed data to a specified measuring point, performs data characteristic quantity calculation on the parameter data, analyzes the data to obtain state information of the oil-immersed transformer, and sends the state information to an equipment monitoring and diagnosis platform;
the equipment monitoring and diagnosing platform generates alarm information according to the state information, displays the state information and the alarm information in real time and sends the alarm information to a remote terminal;
and the remote terminal pushes abnormal maintenance information to a maintenance end according to the alarm information.
In one embodiment, the analyzing the state information of the oil-filled transformer by the data analysis station includes:
the data analysis station acquires the load rate and temperature rise data of the oil immersed transformer in a period, and the temperature rise data are arranged in an ascending order according to the load rate to obtain a temperature rise data list;
and the data analysis station determines the mean value and the variance of the temperature rise data of the same load factor in one period according to the temperature rise data list, and uses the mean value and the variance of the temperature rise data as the wireless fitting temperature rise value reference to obtain a temperature rise fitting curve.
In one embodiment, the method further comprises:
the equipment monitoring and diagnosing platform acquires a temperature rise alarm index and monitors the state of the oil immersed transformer in real time according to the temperature rise alarm index and the temperature rise fitting curve;
and the equipment monitoring and diagnosing platform corrects the temperature rise fitting curve by adopting a variable moving average method, and determines the abnormal state of the oil immersed transformer according to the temperature rise alarm index.
The oil immersed transformer on-line monitoring system and the method thereof comprise an information acquisition terminal and an equipment operation and maintenance center; the information acquisition terminal is interconnected with the equipment operation and maintenance center; the information acquisition terminal comprises an oil temperature acquisition unit, an environmental parameter acquisition unit, an oil online acquisition unit and a load current acquisition unit; wherein: the oil temperature acquisition unit is used for acquiring an upper layer oil temperature signal of the oil immersed transformer; the environment parameter acquisition unit is used for detecting the environment parameters of the oil immersed transformer; the oil online acquisition unit is used for acquiring gas and micro-water data in the oil of the oil immersed transformer; the load current acquisition unit is used for acquiring a load current signal in the oil-immersed transformer; the equipment operation and maintenance center comprises a signal acquisition server, a data analysis station, an equipment monitoring and diagnosis platform and a remote terminal; wherein: the signal acquisition server is connected with the oil temperature acquisition unit, the environment parameter acquisition unit, the oil online acquisition unit and the load current acquisition unit and is used for receiving the upper oil temperature signal, the environment parameters, the gas and micro-water data and the load current signal transmitted from the information acquisition terminal; the data analysis station is connected with the signal acquisition server and is used for data communication management, data storage management and comprehensive diagnosis of the state information of the oil immersed transformer; the equipment monitoring and diagnosing platform is connected with the data analysis station and is used for configuring an equipment tree and basic information, displaying state information of the oil immersed transformer, managing alarm events and configuring user permission; and the remote terminal is connected with the equipment monitoring and diagnosing platform and used for displaying the state information of the oil immersed transformer. The oil temperature signal, the environmental parameter, the gas and micro-water data and the load current signal of the oil immersed transformer are collected and extracted in real time, and data analysis is carried out through the signal collection server, the data analysis station and the equipment monitoring and diagnosing platform, so that the abnormity of the oil immersed transformer can be timely and accurately found, the abnormity type can be diagnosed, the operation and maintenance cost is reduced, and the operation and maintenance efficiency is improved.
Drawings
FIG. 1 is a block diagram of an on-line monitoring system for an oil immersed transformer in one embodiment;
FIG. 2 is a block diagram of an online monitoring system for an oil immersed transformer in another embodiment;
FIG. 3 is a schematic flow chart of an oil immersed transformer online monitoring method in one embodiment;
fig. 4 is a schematic diagram of a temperature rise at load factor of an oil transformer in an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, as shown in fig. 1, there is provided an online monitoring system for an oil immersed transformer, including: the system comprises an information acquisition terminal 100 and an equipment operation and maintenance center 200; the information acquisition terminal 100 is interconnected with the equipment operation and maintenance center 200; the information acquisition terminal 100 comprises an oil temperature acquisition unit 110, an environmental parameter acquisition unit 120, an oil on-line acquisition unit 130 and a load current acquisition unit 140; wherein: the oil temperature acquisition unit 110 is used for acquiring an upper layer oil temperature signal of the oil immersed transformer; an environmental parameter collecting unit 120, configured to detect an environmental parameter of the oil immersed transformer; the oil online acquisition unit 130 is used for acquiring gas and micro-water data in oil of the oil immersed transformer; the load current acquisition unit 140 is used for acquiring a load current signal in the oil immersed transformer; the equipment operation and maintenance center 200 comprises a signal acquisition server 210, a data analysis station 220, an equipment monitoring and diagnosis platform 230 and a remote terminal 240; wherein: the signal acquisition server 210 is connected to the oil temperature acquisition unit 110, the environmental parameter acquisition unit 120, the oil online acquisition unit 130 and the load current acquisition unit 140, and is configured to receive an upper oil temperature signal, an environmental parameter, gas and micro-water data and a load current signal transmitted from the information acquisition terminal 100; the data analysis station 220 is connected with the signal acquisition server 210 and is used for data communication management, data storage management and comprehensive diagnosis of state information of the oil immersed transformer; the equipment monitoring and diagnosing platform 230 is connected with the data analysis station 220 and is used for configuring equipment trees and basic information, displaying state information of the oil immersed transformer, managing alarm events and configuring user rights; and the remote terminal 240 is connected with the equipment monitoring and diagnosing platform 230 and is used for displaying the state information of the oil immersed transformer.
The oil immersed transformer online monitoring system provided in this embodiment may adopt a three-electricity integration technology, as shown in fig. 1, the oil immersed transformer online monitoring system may include an information acquisition terminal 100 and an equipment operation and maintenance center 200, where the information acquisition terminal 100 may be interconnected with the equipment operation and maintenance center 200.
The information acquisition terminal 100 may be disposed at an oil-immersed transformer, so as to facilitate acquisition of data related to the oil-immersed transformer. Specifically, the information acquisition terminal 100 may acquire the process and monitoring data of the oil immersed transformer through various acquisition modes such as wired serial port RS485, RJ45, wireless or the like, and transmit the acquired data to the equipment operation and maintenance center 200.
The information acquisition terminal 100 may include an oil temperature acquisition unit 110, an environmental parameter acquisition unit 120, an oil online acquisition unit 130, and a load current acquisition unit 140, and each unit in the information acquisition terminal 100 may be distributed on the oil-immersed transformer to respectively acquire different data related to the oil-immersed transformer.
The oil temperature collection unit 110 may be configured to collect upper layer oil temperature signals of the oil-immersed transformer in real time, and then the oil temperature collection unit 110 may send the collected upper layer oil temperature signals to the signal collection server 210 in real time. Specifically, the oil temperature collection unit 110 may transmit the upper layer oil temperature signal to the signal collection server 210 through an RS485 communication manner or a 4-20mA signal.
The environment parameter collecting unit 120 may be configured to detect an environment parameter of the oil immersed transformer in real time, and then the environment parameter collecting unit 120 may send the collected environment parameter to the signal collecting server 210 in real time.
The oil online acquisition unit 130 may be configured to acquire gas and micro water data in oil of the oil-immersed transformer in real time, and transmit the acquired gas and micro water data to the signal acquisition server 210.
The load current collecting unit 140 may be configured to collect a load current signal in the oil-immersed transformer in real time, and transmit the collected load current signal to the signal collecting server 210 in a communication manner, so as to calculate the transformation load ratio.
The equipment operation and maintenance center 200 may include a signal acquisition server 210, a data analysis station 220, an equipment monitoring and diagnosis platform 230, and a remote terminal 240. The signal acquisition server 210 may be connected to the data analysis station 220, the data analysis station 220 may be connected to the device monitoring and diagnosing platform 230, and the device monitoring and diagnosing platform 230 may be connected to the remote terminal 240. In this embodiment, the signal collection server 210 may further be connected to the oil temperature collection unit 110, the environmental parameter collection unit 120, the oil online collection unit 130, and the load current collection unit 140 in the information collection terminal 100, and is configured to receive data collected by each unit in the information collection terminal 100.
The signal acquisition server 210 may be connected to and communicate with each unit in the information acquisition terminal 100 through a network, and the signal acquisition server 210 may perform interface development and protocol configuration on the oil temperature acquisition unit 110, the environmental parameter acquisition unit 120, the oil online acquisition unit 130, and the load current acquisition unit 140, thereby implementing acquisition of monitoring data of the oil-immersed transformer. In this embodiment, the signal collection server 210 may be configured to provide overall management and control of data, so as to implement management of collection data reception and data analysis. Specifically, the signal collecting server 210 may perform real-time monitoring of data through communication, and perform state tracking in the communication process.
The data analysis station 220 can be used for data communication management, data storage management and comprehensive diagnosis of the state information of the oil immersed transformer. The data analysis station 220 may be connected to the signal acquisition server 210, and receive the acquired monitoring data of the oil immersed transformer from the signal acquisition server 210, so as to perform data storage and status analysis.
The device monitoring and diagnosing platform 230 may be configured to configure a device tree and basic information, display state information of the oil immersed transformer, manage alarm events, and configure user rights. The device monitoring and diagnosing platform 230 may be connected to the data analysis station 220, and acquires a comprehensive diagnosis result of the state information of the oil immersed transformer from the data analysis station 220, so as to perform state display and alarm management. Specifically, the device monitoring and diagnosing platform 230 may include device hierarchy management, device attribute management, device measurement point management, detection parameter management, and device document management when configuring the device tree and the basic information.
The remote terminal 240 may be connected to the device monitoring and diagnosing platform 230, and acquire the state information comprehensive diagnosis result and alarm information of the oil immersed transformer from the device monitoring and diagnosing platform 230. Remote terminal 240 is convenient for the customer to look over information through webpage graphical interface or client APP on line, and remote terminal 240's setting is convenient for issue the maintenance order in the condition that alarm information appears, gives professional fortune dimension team unusually propelling movement for fortune dimension team carries out the thread maintenance.
In this embodiment, according to the oil immersed transformer online monitoring system, the oil temperature signal, the environmental parameter, the gas and micro-water data and the load current signal of the oil immersed transformer are collected and extracted in real time, and data analysis is performed through the signal collection server, the data analysis station and the equipment monitoring and diagnosis platform, so that the abnormality of the oil immersed transformer can be timely and accurately found, the abnormal type is diagnosed, the operation and maintenance cost is reduced, and the operation and maintenance efficiency is improved.
In one embodiment, as shown in fig. 2, the environment parameter acquiring unit 120 includes a temperature sensor 122, a pressure sensor 124, and a humidity sensor 126, which are respectively configured to detect temperature data, pressure data, and humidity data of an environment in which the oil-immersed transformer is located, and use the detected temperature data, pressure data, and humidity data as the environment parameter.
Specifically, the temperature sensor 122 may be configured to acquire temperature data of an environment where the oil-immersed transformer is located; pressure sensor 124 may be used to collect pressure data in the oil transformer; humidity sensor 126 may be used to collect humidity data of the environment in the oil transformer. The temperature sensor 122, the pressure sensor 124 and the humidity sensor 126 may transmit the respective collected temperature data, pressure data and humidity data to the signal collection server 210.
As shown in fig. 2, in one embodiment, the online oil collection unit 130 includes an oil-gas separation unit 132, a micro-water detection unit 134, and a gas detection unit 136; the oil-gas separation unit 132 is used for separating dissolved gas in transformer oil in the oil-immersed transformer; the micro-water detection unit 134 is used for detecting the micro-water content in transformer oil in the oil immersed transformer; and a gas detection unit 136 for detecting each component and concentration of the dissolved gas.
The oil and gas separation unit 132 may be used to separate dissolved gases from transformer oil in an oil transformer. Specifically, the oil-gas separation unit 132 may separate dissolved gas in the transformer oil by a vacuum constant-temperature degassing technology, so as to provide the gas to be detected to the gas detection unit 136.
The micro water detection unit 134 may be configured to detect the micro water content in the transformer oil in the oil-immersed transformer, and transmit the detection result to the signal acquisition server 210.
The gas detection unit 136 may be used to detect the components and concentrations of the dissolved gas. Specifically, the gas detection unit 136 may be connected to the oil-gas separation unit 132, and configured to detect components and concentrations of the dissolved gas separated in the oil-gas separation unit 132, and send a detection result to the signal acquisition server 210.
In this embodiment, the temperature data, the pressure data, and the humidity data collected by the environmental parameter collecting unit 120 may be used to provide a basis for calibrating and correcting the data of the oil-gas separating unit 132 and the gas detecting unit 136.
In one embodiment, the gas detection unit may include a signal module, a laser control and protection module, a laser, an absorption cell, a photo detection module, a harmonic detection module, and a filtering module, which cooperate with each other to detect the composition and concentration of the gas to be detected.
As shown in fig. 2, in one embodiment, the information collecting terminal 100 further includes a high voltage switch comprehensive protection system 150; the load current collection unit 140 transmits the load current signal to the signal collection server 210 through the high-voltage switch integrated protection system 150.
Specifically, the load current collecting unit 140 may transmit the voltage transformation load current signal to the signal collecting server 210 in a communication manner through the high-voltage switch integrated protection system 150, so as to calculate the load factor of the oil transformer.
In one embodiment, the data analysis station can comprise a data communication module, a data storage module and a state information comprehensive diagnosis module; the data communication module is used for analyzing different types of data, merging each data to a corresponding measuring point respectively and finishing the association between the measuring point and the data; the data storage module is used for performing real-time storage, temporary storage and persistent storage on data according to the data type; and the state information comprehensive diagnosis module is used for calculating the data characteristic quantity and analyzing and judging the state information of the oil-immersed transformer.
The data communication module can provide the function of analyzing different types of data and is used for analyzing the different types of data. The data communication module can merge the data to the appointed measuring points of the corresponding equipment, the automatic association between the measuring points and the data is completed, meanwhile, various numerical calculations are carried out on the data needing to be further processed, and the characteristic quantity extraction required by analysis is realized. Specifically, in this embodiment, the data subjected to merging and association may be data of each parameter of the oil-immersed transformer acquired by the information acquisition terminal.
The data storage module can be used for performing real-time storage, temporary storage and persistent storage on data according to data types. Specifically, the data storage module can store data according to the data type of each parameter data of the oil-immersed transformer. Wherein, the temporary storage is to store the original analysis data not exceeding one month according to professional requirements; storing the real-time data which needs to be used frequently in a real-time database such as redis; and various diagnosis results, collected quantitative values and other related data information are stored in a system relational database such as Postgresql, mysql and the like, and various collected state data such as current characteristic values, electric signals and the like are stored in an Hbase database.
The state information comprehensive diagnosis module can be used for calculating the data characteristic quantity and analyzing and judging the state information of the oil-immersed transformer. Specifically, the state information comprehensive diagnosis module in the data analysis station may perform data characteristic quantity calculation on the acquired parameter data of the oil-immersed transformer, so as to analyze and judge the state information of the oil-immersed transformer.
In one embodiment, the detection and diagnosis platform comprises a display module, an alarm module, a user authority management module, a data analysis module and an interface extension module; the display module is used for displaying the state information of the oil immersed transformer; the alarm module is used for setting the equipment attribution and the statistical rule of alarm and generating alarm information; the user authority management module is used for adding, modifying and deleting users and distributing different roles to the users; the data analysis module is used for carrying out numerical analysis and signal analysis on data transmitted in the information acquisition terminal; and the interface expansion module is used for providing an expansion interface.
The display module can be used for displaying the state information of the oil immersed transformer in a centralized mode, specifically, the display module can monitor real-time data and provide a display interface of the area of the oil immersed transformer or real-time data collected by the oil immersed transformer, and displays the state, the quantity statistics, the early warning information and the like of the monitored oil immersed transformer in real time.
The alarm module can be used for setting the equipment attribution and the statistical rule of the alarm and generating alarm information. In this embodiment, the alarm module may provide an alarm setting tool, which is convenient for the staff to set the equipment affiliation and statistical rule of the alarm, so that the transmission, display, push, and final evaluation processes after the alarm is generated form a complete life cycle loop. When an abnormal near condition occurs, the signal acquisition server can track the state of the communication process, and a long-term non-response channel can form communication fault early warning and report the abnormal state, so that the signal acquisition server can ensure the stability and the safety of the interfaces of the display module and the data analysis module.
And the user authority management module is used for adding, modifying and deleting users and distributing different roles for the users. Specifically, the user right management module may include basic management functions of user addition, modification, deletion, and the like, and may also be used to divide the user into different roles, allow the user to define the roles, and the like, so that the user can browse and operate according to the different roles.
The data analysis module can be used for carrying out numerical analysis and signal analysis on data transmitted in the information acquisition terminal. In this embodiment, the data analysis module may include numerical analysis and signal analysis. The numerical analysis can be used for analyzing the variation trend of the numerical value, including single index trend, multi-index trend and index comparison among different devices, and a user can analyze and diagnose the operation of the device, namely the operation of the oil-immersed transformer, by comparing the index trends among the different devices.
An interface expansion module may be used to provide an expansion interface. In this embodiment, the interface expansion module may provide an interface function, which belongs to a reserved and designed compatibility expandable function module, and data may be provided to other device management systems through a standard communication protocol interface of TCP/IP, and may be called and read and written in real time.
As shown in fig. 3, in an embodiment, an online monitoring method for an oil immersed transformer is provided, which includes the following steps:
step 306, the data analysis station stores the parameter data, performs data analysis on the parameter data, corresponds the analyzed data to the specified measuring point, performs data characteristic quantity calculation on the parameter data, analyzes the data to obtain the state information of the oil immersed transformer, and sends the state information to the equipment monitoring and diagnosis platform;
308, the equipment monitoring and diagnosing platform generates alarm information according to the state information, displays the state information and the alarm information in real time and sends the alarm information to a remote terminal;
and 310, the remote terminal pushes abnormal maintenance information to the maintenance end according to the alarm information.
In an embodiment, the provided online monitoring method for the oil immersed transformer may further include a process of analyzing each parameter of the oil immersed transformer to obtain a fitting curve, where the specific process includes: the method comprises the steps that a data analysis station obtains the load rate and temperature rise data of the oil immersed transformer in a period, and the temperature rise data are arranged in an ascending order according to the load rate to obtain a temperature rise data list; and the data analysis station determines the mean value and the variance of the temperature rise data of the same load rate in one period according to the temperature rise data list, and takes the mean value and the variance of the temperature rise data as the standard of a wireless fitting temperature rise value to obtain a temperature rise fitting curve.
The same oil-immersed transformer works under different load conditions, the temperature rise can be different, and generally the higher the load rate is, the larger the temperature rise is. At different times, under the condition that the same oil immersed transformer is under the same load, the temperature rise fluctuates within a certain normal range. Therefore, a functional relation between the two variables can be obtained by fitting the load factor-temperature rise curve, and the load factor-temperature rise curve of the oil-immersed transformer is shown in fig. 4.
In this embodiment, the data analysis station may obtain data first, that is, in a time range of a certain period T, the oil-immersed transformer undergoes a complete load variation period, and load rate and temperature rise data in the time range of T are taken and arranged in an ascending order according to the load rate.
The data analysis station can then determine the temperature rise for the same load rate. Specifically, the data analysis station takes the mean value and the variance of the temperature rise values corresponding to the same load rate within a time range of a certain period T, and can be used as a reference of curve fitting temperature rise values. Wherein, the calculation formula of the variance sigma is as follows:
wherein X represents a temperature rise value. Further, the data analysis station may combine the fitted data n-order curve by using the polyfit/poly1d function in python, output the fitted curve equation, and verify to obtain the final fitted curve equation.
In an embodiment, the provided oil immersed transformer online monitoring method may further include a process of determining a state anomaly, where the specific process includes: the equipment monitoring and diagnosing platform acquires a temperature rise alarm index and monitors the state of the oil immersed transformer in real time according to the temperature rise alarm index and a temperature rise fitting curve; and the equipment monitoring and diagnosing platform corrects the temperature rise fitting curve by adopting a variable moving average method, and determines the state abnormity of the oil immersed transformer according to the temperature rise alarm index.
In this embodiment, the device monitoring and diagnosing platform may be provided with an early warning rule according to the temperature rise of the load change, specifically including threshold early warning and rate of change early warning. The threshold early warning can be based on the load rate I (actual current/rated value) temperature rise fitting direction, the multi-level recessive fixed threshold set value (early warning is more than or equal to 1.06 percent, warning is more than or equal to 1.1 percent) is carried out on the temperature rise alarm index (temperature) according to the temperature rise corresponding to different load rates, and the equipment monitoring and diagnosing platform can monitor the index in real time according to the thresholds. By considering the fluctuation of data and setting the duration or the number of times, the effect of avoiding false alarm of interference signals can be achieved. The early warning of the change rate can be to adopt a variable moving average method to correct the original time sequence data, so as to eliminate the influence of seasonal variation and individual irregular variation on the whole data; the equipment monitoring and diagnosing platform can set a time window T of the state index values according to different load rate conditions, take the average change rate of the state index values of the connected time windows as a judgment index, and take the deviation change amplitude as a judgment condition to analyze the sudden change of the index so as to prompt the abnormality of the equipment state. Wherein, the average change rate can be set by the user, and the average change rate is more than or equal to 8%.
In one embodiment, the oil immersed transformer online monitoring method provided by the invention can further comprise the combination of oil online analysis and temperature rise early warning. Specifically, after the oil online acquisition module acquires gas and micro-water data, the data analysis station can identify the fault of the oil-immersed transformer according to the gas concentration and micro-water content information transmitted by the oil online acquisition module, and then further determine the reason of over-temperature according to a characteristic gas method and a gas content ratio method in national standard of 'analysis and judgment of dissolved gas in transformer oil' and a fault judgment system established by fault cases, and simultaneously combine the reasons of temperature rise change of the load rate of the transformer, so as to analyze and judge the state information of the transformer. The reason for the over-temperature may include: poor contact of a tap switch, turn-to-turn short circuit of a winding, short circuit between iron core silicon steel sheets or insulation damage of a penetrating screw rod.
It should be understood that, although the steps in the above-described flowcharts are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not limited to being performed in the exact order illustrated and, unless explicitly stated herein, may be performed in other orders. Moreover, at least a portion of the steps in the above-described flowcharts may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or the stages is not necessarily sequential, but may be performed alternately or alternatingly with other steps or at least a portion of the sub-steps or stages of other steps.
All possible combinations of the technical features in the above embodiments may not be described for the sake of brevity, but should be considered as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several 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 a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An oil immersed transformer on-line monitoring system is characterized by comprising an information acquisition terminal and an equipment operation and maintenance center; the information acquisition terminal is interconnected with the equipment operation and maintenance center; the information acquisition terminal comprises an oil temperature acquisition unit, an environmental parameter acquisition unit, an oil online acquisition unit and a load current acquisition unit; wherein:
the oil temperature acquisition unit is used for acquiring an upper layer oil temperature signal of the oil immersed transformer;
the environment parameter acquisition unit is used for detecting the environment parameters of the oil immersed transformer;
the oil online acquisition unit is used for acquiring gas and micro-water data in the oil of the oil immersed transformer;
the load current acquisition unit is used for acquiring a load current signal in the oil-immersed transformer;
the equipment operation and maintenance center comprises a signal acquisition server, a data analysis station, an equipment monitoring and diagnosis platform and a remote terminal; wherein:
the signal acquisition server is connected with the oil temperature acquisition unit, the environment parameter acquisition unit, the oil online acquisition unit and the load current acquisition unit and is used for receiving the upper oil temperature signal, the environment parameters, the gas and micro-water data and the load current signal transmitted from the information acquisition terminal;
the data analysis station is connected with the signal acquisition server and is used for data communication management, data storage management and comprehensive diagnosis of the state information of the oil immersed transformer;
the equipment monitoring and diagnosing platform is connected with the data analysis station and is used for configuring equipment trees and basic information, displaying state information of the oil immersed transformer, managing alarm events and configuring user permission;
and the remote terminal is connected with the equipment monitoring and diagnosing platform and used for displaying the state information of the oil immersed transformer.
2. The oil immersed transformer online monitoring system according to claim 1, wherein the environment parameter acquisition unit comprises a temperature sensor, a pressure sensor and a humidity sensor, and is respectively used for detecting temperature data, pressure data and humidity data of an environment where the oil immersed transformer is located, and taking the detected temperature data, pressure data and humidity data as the environment parameters.
3. The oil immersed transformer on-line monitoring system of claim 1, wherein the oil on-line collecting unit comprises an oil-gas separation unit, a micro-water detection unit, and a gas detection unit; the oil-gas separation unit is used for separating dissolved gas in transformer oil in the oil-immersed transformer; the micro-water detection unit is used for detecting the micro-water content in the transformer oil in the oil immersed transformer; the gas detection unit is used for detecting each component and concentration of the dissolved gas.
4. The oil immersed transformer on-line monitoring system of claim 3, wherein the gas detection unit comprises a signal module, a laser control and protection module, a laser, an absorption cell, a photoelectric detection module, a harmonic detection module, and a filtering module.
5. The oil immersed transformer on-line monitoring system of claim 1, wherein the information acquisition terminal further comprises a high-voltage switch integrated protection system; and the load current acquisition unit transmits the load current signal to the signal acquisition server through the high-voltage switch comprehensive protection system.
6. The oil immersed transformer on-line monitoring system of claim 1, wherein the data analysis station comprises a data communication module, a data storage module, and a state information comprehensive diagnosis module; the data communication module is used for analyzing different types of data, merging each data to a corresponding measuring point respectively and finishing the association between the measuring points and the data; the data storage module is used for performing real-time storage, temporary storage and persistent storage on data according to data types; and the state information comprehensive diagnosis module is used for calculating the data characteristic quantity and analyzing and judging the state information of the oil immersed transformer.
7. The oil immersed transformer online monitoring system according to claim 1, wherein the equipment monitoring and diagnosing platform comprises a display module, an alarm module, a user authority management module, a data analysis module and an interface extension module; the display module is used for displaying the state information of the oil immersed transformer; the alarm module is used for setting equipment attribution and statistical rules of alarm and generating alarm information; the user authority management module is used for adding, modifying and deleting users and distributing different roles to the users; the data analysis module is used for carrying out numerical analysis and signal analysis on the data transmitted in the information acquisition terminal; the interface expansion module is used for providing an expansion interface.
8. An oil immersed transformer online monitoring method is characterized by comprising the following steps:
the method comprises the steps that an information acquisition terminal acquires parameter data of the oil immersed transformer and sends the parameter data to a signal acquisition server;
the signal acquisition server receives the parameter data, monitors the parameter data in real time through a communication link, and sends the parameter data to a data analysis station;
the data analysis station stores the parameter data, performs data analysis on the parameter data, corresponds the analyzed data to a specified measuring point, performs data characteristic quantity calculation on the parameter data, analyzes the data to obtain state information of the oil-immersed transformer, and sends the state information to an equipment monitoring and diagnosis platform;
the equipment monitoring and diagnosing platform generates alarm information according to the state information, displays the state information and the alarm information in real time and sends the alarm information to a remote terminal;
and the remote terminal pushes abnormal maintenance information to a maintenance end according to the alarm information.
9. The oil transformer online monitoring method according to claim 8, wherein the analyzing of the state information of the oil transformer by the data analysis station comprises:
the data analysis station acquires the load rate and temperature rise data of the oil immersed transformer in a period, and the temperature rise data are arranged in an ascending order according to the load rate to obtain a temperature rise data list;
and the data analysis station determines the mean value and the variance of the temperature rise data of the same load rate in one period according to the temperature rise data list, and takes the mean value and the variance of the temperature rise data as the reference of a wireless fitting temperature rise value to obtain a temperature rise fitting curve.
10. The oil transformer online monitoring method of claim 9, further comprising:
the equipment monitoring and diagnosing platform acquires a temperature rise alarm index and monitors the state of the oil immersed transformer in real time according to the temperature rise alarm index and the temperature rise fitting curve;
and the equipment monitoring and diagnosing platform corrects the temperature rise fitting curve by adopting a variable moving average method, and determines the abnormal state of the oil immersed transformer according to the temperature rise alarm index.
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| CN202210805317.7A CN115248402A (en) | 2022-07-08 | 2022-07-08 | Oil immersed transformer on-line monitoring system and method |
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| CN202210805317.7A CN115248402A (en) | 2022-07-08 | 2022-07-08 | Oil immersed transformer on-line monitoring system and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115542063A (en) * | 2022-11-30 | 2022-12-30 | 中国电力科学研究院有限公司 | Standardized monitoring terminal device for transformer and monitoring method thereof |
| CN116295661A (en) * | 2023-05-22 | 2023-06-23 | 济南西电特种变压器有限公司 | Transformer fault early warning system based on Internet of things |
| TWI831485B (en) * | 2022-11-24 | 2024-02-01 | 行政院原子能委員會核能研究所 | Power transformer temperature monitoring and load early warning system |
| CN117875092A (en) * | 2024-03-12 | 2024-04-12 | 通变电器有限公司 | Method, device, equipment and storage medium for predicting operation cost of oil immersed transformer |
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2022
- 2022-07-08 CN CN202210805317.7A patent/CN115248402A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI831485B (en) * | 2022-11-24 | 2024-02-01 | 行政院原子能委員會核能研究所 | Power transformer temperature monitoring and load early warning system |
| CN115542063A (en) * | 2022-11-30 | 2022-12-30 | 中国电力科学研究院有限公司 | Standardized monitoring terminal device for transformer and monitoring method thereof |
| CN116295661A (en) * | 2023-05-22 | 2023-06-23 | 济南西电特种变压器有限公司 | Transformer fault early warning system based on Internet of things |
| CN117875092A (en) * | 2024-03-12 | 2024-04-12 | 通变电器有限公司 | Method, device, equipment and storage medium for predicting operation cost of oil immersed transformer |
| CN117875092B (en) * | 2024-03-12 | 2024-06-07 | 通变电器有限公司 | Method, device, equipment and storage medium for predicting operation cost of oil immersed transformer |
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