CN116125232A - Comprehensive monitoring and early warning method, device, medium and equipment for transformer - Google Patents
Comprehensive monitoring and early warning method, device, medium and equipment for transformer Download PDFInfo
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Abstract
The invention discloses a comprehensive monitoring and early warning method, device, medium and equipment for a transformer. The method comprises the following steps: monitoring the amplitude and the frequency of high-frequency and ultrasonic partial discharge signals of a transformer in real time within a preset time range, wherein the transformer is 500kV or more; respectively judging the absolute value of the amplitude and the frequency of the high-frequency partial discharge signals and the ultrasonic partial discharge signals by utilizing a preset relative threshold value, and determining an absolute value decision result; respectively judging the amplitude and the frequency of the high-frequency partial discharge signals and the ultrasonic partial discharge signals by utilizing preset relative threshold values, and determining a relative value decision result; performing and/or decision on the absolute value decision result and the relative value decision result through preset joint logic, and determining an early warning decision result; and determining the early warning grade of the transformer according to a preset early warning strategy and an early warning decision result.
Description
Technical Field
The invention relates to the technical field of transformer early warning, in particular to a method, a device, a medium and equipment for comprehensively monitoring and early warning of a transformer.
Background
The 500kV and above transformer is core equipment of the power grid, and safe and stable operation is a key link for guaranteeing reliable power supply. However, in recent years, explosion combustion accidents caused by insulation faults inside transformers occur, which directly cause equipment damage, affect reliable power supply, and cause adverse social effects. The accidents are caused by insulation faults in the transformer, the faults rapidly develop from light micro discharge faults to high-energy discharge faults, the discharge energy is huge, the insulation breakdown of the transformer is caused, and finally the explosion combustion is caused. How to find and process internal faults in time before the insulation breakdown of the transformer and avoid explosion and combustion accidents is a difficult problem to be solved urgently in the current equipment management.
The high-energy discharge fault before the insulation breakdown of the large-scale transformer is developed rapidly, and the existing protection and on-line monitoring do not have a processing function. The transformer main protection comprises differential protection and gas protection, which are both passive protection after insulation breakdown and cannot be active protection before insulation breakdown. The existing transformer on-line monitoring device discovers internal faults through state monitoring data such as discharge signals, oil chromatography and the like, but all the faults need to be manually analyzed and judged, a processing scheme is determined, the processing period is long, the slight discharge faults can be processed, and the faults reaching high-energy discharge in the later stage of discharge development cannot be treated in time.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a comprehensive monitoring and early warning method, device, medium and equipment for a transformer.
According to one aspect of the invention, there is provided a comprehensive monitoring and early warning method for a transformer, comprising:
monitoring the amplitude and the frequency of high-frequency and ultrasonic partial discharge signals of a transformer in real time within a preset time range, wherein the transformer is 500kV or more;
respectively judging the absolute value of the amplitude and the frequency of the high-frequency partial discharge signals and the ultrasonic partial discharge signals by utilizing a preset relative threshold value, and determining an absolute value decision result;
respectively judging the amplitude and the frequency of the high-frequency partial discharge signals and the ultrasonic partial discharge signals by utilizing preset relative threshold values, and determining a relative value decision result;
performing and/or decision on the absolute value decision result and the relative value decision result through preset joint logic, and determining an early warning decision result;
and determining the early warning grade of the transformer according to a preset early warning strategy and an early warning decision result.
Optionally, the absolute value judgment is performed on the amplitude and the frequency of the high-frequency partial discharge signals and the ultrasonic partial discharge signals respectively by using a preset relative threshold value, and the determination of the absolute value decision result comprises the following steps:
and performing AND or decision on the amplitude and frequency of the high-frequency partial discharge signals and the ultrasonic partial discharge signals by using a relative threshold value to determine an absolute value result.
Optionally, the method includes respectively performing relative value judgment on the amplitude and the frequency of the high-frequency partial discharge signal and the ultrasonic partial discharge signal by using a preset relative threshold value, and determining a relative value decision result, including:
and (3) carrying out relative logic judgment on the amplitude and the frequency of the high-frequency partial discharge signals and the ultrasonic partial discharge signals by using a relative threshold value, and determining a relative value decision result.
Optionally, performing and/or decision on the absolute value decision result and the relative value decision result through preset joint logic, and determining an early warning decision result includes:
when the transformer is key equipment, the combination logic performs or decision on the absolute value decision result and the relative value decision result, and determines an early warning decision result;
when the transformer is common equipment, the combination logic performs AND decision on the absolute value decision result and the relative value decision result, and determines an early warning decision result.
Optionally, determining the early warning level of the transformer according to a preset early warning strategy and an early warning decision result includes:
judging whether the amplitude values of the high-frequency partial discharge signals and the ultrasonic partial discharge signals exceed a preset amplitude threshold value at the same time;
under the condition that the amplitude of the high-frequency and ultrasonic partial discharge signals exceeds an amplitude threshold at the same time, the discharge times of the high-frequency and ultrasonic partial discharge signals in a plurality of frequency waves are monitored, and whether the discharge times exceed the preset discharge times threshold is judged;
and under the condition that the discharge times exceeds a discharge times threshold value, determining the early warning level as a first-stage early warning.
Optionally, determining the early warning level of the transformer according to a preset early warning strategy and an early warning decision result, and further includes:
after a preset time period with the early warning level of primary early warning, monitoring the discharge intensity change rate of high-frequency and ultrasonic partial discharge signals in a first preset time range, and judging whether the discharge intensity change rate exceeds a preset discharge intensity change rate threshold;
under the condition that the discharge intensity change rate exceeds a discharge intensity change rate threshold value, identifying discharge types of the high-frequency and ultrasonic partial discharge signals, and judging whether the high-frequency and ultrasonic partial discharge signals have discharge signals at the same time;
under the condition that discharge signals exist in the high-frequency and ultrasonic partial discharge signals at the same time, the early warning level is modified into a second-level early warning.
Optionally, determining the early warning level of the transformer according to a preset early warning strategy and an early warning decision result, and further includes:
under the condition that the early warning level is a secondary early warning, judging whether the discharge intensity of the high-frequency and ultrasonic partial discharge signals exceeds a preset discharge quantity threshold value;
under the condition that the discharge intensity exceeds the discharge quantity threshold value, determining a first judgment condition to judge that the discharge quantity within a second preset time range is larger than or equal to the discharge quantity threshold value;
determining the second judgment condition as judging that the discharge quantity in the third preset time range meets the exponential increase;
determining a third judging condition to judge that the increase of the discharge quantity exceeds a preset percentage in a fourth preset time range;
and under the condition that any one of the first judging condition, the second judging condition and the third judging condition is met, modifying the early warning level into three-level early warning and sending a tripping signal.
According to another aspect of the present invention, there is provided a transformer integrated monitoring and early warning device, including:
the monitoring module is used for monitoring the amplitude and the frequency of the high-frequency and ultrasonic partial discharge signals of the transformer in real time within a preset time range, wherein the transformer is 500kV or more;
the first determining module is used for respectively judging the absolute value of the amplitude and the frequency of the high-frequency partial discharge signals and the ultrasonic partial discharge signals by utilizing a preset relative threshold value and determining an absolute value decision result;
the second determining module is used for judging the relative value of the amplitude and the frequency of the high-frequency partial discharge signals and the ultrasonic partial discharge signals respectively by utilizing a preset relative threshold value and determining a relative value decision result;
the third determining module is used for performing and/or decision on the absolute value decision result and the relative value decision result through preset joint logic to determine an early warning decision result;
and the fourth determining module is used for determining the early warning grade of the transformer according to the preset early warning strategy and the early warning decision result.
According to a further aspect of the present invention there is provided a computer readable storage medium storing a computer program for performing the method according to any one of the above aspects of the present invention.
According to still another aspect of the present invention, there is provided an electronic device including: a processor; a memory for storing the processor-executable instructions; the processor is configured to read the executable instructions from the memory and execute the instructions to implement the method according to any of the above aspects of the present invention.
Therefore, the comprehensive monitoring and early warning method for the transformer is provided with early warning strategies of 'two clues', 'two signals', 'three judgments', 'three logics', the amplitude and the frequency of the high-frequency and ultrasonic partial discharge signals are measured in real time through the monitoring device, the absolute threshold value and the relative threshold value are judged in real time, fault discharge characteristics can be accurately obtained before the internal fault insulation breakdown of the transformer, the logic judgments are carried out according to the fault discharge characteristics, the fault discharge development situation is rapidly and reliably analyzed, when the early warning strategies judge that the fault discharge has evolved to high-energy discharge, the impending insulation breakdown is judged, and linkage instructions are sent to the oil dissolved gas monitoring system.
Drawings
Exemplary embodiments of the present invention may be more completely understood in consideration of the following drawings:
fig. 1 is a schematic flow chart of a method for comprehensive monitoring and early warning of a transformer according to an exemplary embodiment of the present invention;
FIG. 2 is a graph showing typical discharge amplitude and frequency versus time according to an exemplary embodiment of the present invention;
FIG. 3 is a strategy flow chart of a method for comprehensive early warning of a large-scale transformer according to an exemplary embodiment of the present invention;
FIG. 4 is a schematic flow chart of signal judgment logic for primary pre-warning of a transformer according to an exemplary embodiment of the present invention;
FIG. 5 is a flow chart of signal determination logic for transformer secondary warning according to an exemplary embodiment of the present invention;
FIG. 6 is a schematic flow chart of signal judgment logic for three-stage early warning of a transformer according to an exemplary embodiment of the present invention;
fig. 7 is a schematic structural diagram of a comprehensive monitoring and early warning device for a transformer according to an exemplary embodiment of the present invention;
fig. 8 is a structure of an electronic device provided in an exemplary embodiment of the present invention.
Detailed Description
Hereinafter, exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. It should be apparent that the described embodiments are only some embodiments of the present invention and not all embodiments of the present invention, and it should be understood that the present invention is not limited by the example embodiments described herein.
It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.
It will be appreciated by those of skill in the art that the terms "first," "second," etc. in embodiments of the present invention are used merely to distinguish between different steps, devices or modules, etc., and do not represent any particular technical meaning nor necessarily logical order between them.
It should also be understood that in embodiments of the present invention, "plurality" may refer to two or more, and "at least one" may refer to one, two or more.
It should also be appreciated that any component, data, or structure referred to in an embodiment of the invention may be generally understood as one or more without explicit limitation or the contrary in the context.
In addition, the term "and/or" in the present invention is merely an association relationship describing the association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In the present invention, the character "/" generally indicates that the front and rear related objects are an or relationship.
It should also be understood that the description of the embodiments of the present invention emphasizes the differences between the embodiments, and that the same or similar features may be referred to each other, and for brevity, will not be described in detail.
Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods, and apparatus should be considered part of the specification.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
Embodiments of the invention are operational with numerous other general purpose or special purpose computing system environments or configurations with electronic devices, such as terminal devices, computer systems, servers, etc. Examples of well known terminal devices, computing systems, environments, and/or configurations that may be suitable for use with the terminal device, computer system, server, or other electronic device include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, hand-held or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network personal computers, small computer systems, mainframe computer systems, and distributed cloud computing technology environments that include any of the foregoing, and the like.
Electronic devices such as terminal devices, computer systems, servers, etc. may be described in the general context of computer system-executable instructions, such as program modules, being executed by a computer system. Generally, program modules may include routines, programs, objects, components, logic, data structures, etc., that perform particular tasks or implement particular abstract data types. The computer system/server may be implemented in a distributed cloud computing environment in which tasks are performed by remote processing devices that are linked through a communications network. In a distributed cloud computing environment, program modules may be located in both local and remote computing system storage media including memory storage devices.
Exemplary method
Fig. 1 is a schematic flow chart of a method for comprehensive monitoring and early warning of a transformer according to an exemplary embodiment of the invention. The embodiment can be applied to an electronic device, as shown in fig. 1, the method 100 for comprehensively monitoring and early warning a transformer includes the following steps:
and 101, monitoring the amplitude and the frequency of the high-frequency and ultrasonic partial discharge signals of the transformer in real time within a preset time range, wherein the transformer is 500kV or more.
Specifically, referring to fig. 2, a graph of typical discharge amplitude and frequency over time is shown.
And 102, respectively judging absolute values of the amplitude and the frequency of the high-frequency partial discharge signals and the ultrasonic partial discharge signals by utilizing preset relative thresholds, and determining an absolute value decision result.
Optionally, the absolute value judgment is performed on the amplitude and the frequency of the high-frequency partial discharge signals and the ultrasonic partial discharge signals respectively by using a preset relative threshold value, and the determination of the absolute value decision result comprises the following steps:
and performing AND or decision on the amplitude and frequency of the high-frequency partial discharge signals and the ultrasonic partial discharge signals by using a relative threshold value to determine an absolute value result.
And 103, judging the relative value of the amplitude and the frequency of the high-frequency partial discharge signals and the ultrasonic partial discharge signals respectively by utilizing a preset relative threshold value, and determining a relative value decision result.
Optionally, the method includes respectively performing relative value judgment on the amplitude and the frequency of the high-frequency partial discharge signal and the ultrasonic partial discharge signal by using a preset relative threshold value, and determining a relative value decision result, including:
and (3) carrying out relative logic judgment on the amplitude and the frequency of the high-frequency partial discharge signals and the ultrasonic partial discharge signals by using a relative threshold value, and determining a relative value decision result.
Specifically, the running state of the transformer of 500kV and above is comprehensively monitored and early-warned, and the active protection of the transformer with high-energy discharge fault before insulation breakdown is especially necessary. The invention systematically provides a comprehensive monitoring and early warning method for a 500kV and above transformer, which is based on high-frequency, ultrasonic and ultra-high-frequency combined sound and electricity discharge signals, accurately acquires fault discharge characteristics before breakdown of internal fault insulation of the transformer, carries out logic judgment according to the fault discharge characteristics at different stages, rapidly and reliably analyzes the development condition of the fault discharge, and sends different early warning signals aiming at slight discharge, low-energy discharge and high-energy discharge, thereby fully playing the advantages of high response speed and high early discharge detection rate of a comprehensive monitoring device and realizing the linkage of the comprehensive monitoring device triggering chromatographic device.
According to the requirements of technical specifications (trial runs) of a comprehensive monitoring device for the state of a transformer (reactor), the comprehensive monitoring device for the transformer (reactor) is provided with a high-frequency and ultrasonic partial discharge monitoring module.
The existing research results and application cases show that in the whole process of partial discharge occurrence and development, three parameters of amplitude, frequency and phase width show an increasing trend in the whole time dimension (different defect types and local time periods have fluctuation, but the whole trend is basically consistent). The invention provides a two-clue, two-signal, three-judgment and three-logic early warning strategy by combining a discharge development mechanism, device technical conditions and field reality and referring to FIG. 3.
The two clues are an absolute threshold value and a relative threshold value, the two signals are high frequency and ultrasonic, and the three judgments are discharge amplitude, discharge product frequency and discharge signal-to-noise ratio; "three logic" is absolute logic (AND or), relative logic (AND or), joint logic (AND or).
Further, the monitoring device measures the amplitude and the frequency of the high-frequency and ultrasonic partial discharge signals in real time, and judges in real time through two clues of an absolute threshold value and a relative threshold value.
Further, for the absolute threshold clue, the high-frequency and ultrasonic amplitude and frequency threshold crossing early warning result enters the absolute value logic to make an AND or decision, the decision result enters the joint logic,
for relative threshold clues, the threshold early warning result of the high-frequency and ultrasonic relative amplitude variation quantity enters relative logic, and the decision result enters joint logic.
And 104, performing and/or decision on the absolute value decision result and the relative value decision result through preset joint logic, and determining an early warning decision result.
Optionally, performing and/or decision on the absolute value decision result and the relative value decision result through preset joint logic, and determining an early warning decision result includes:
when the transformer is key equipment, the combination logic performs or decision on the absolute value decision result and the relative value decision result, and determines an early warning decision result;
when the transformer is common equipment, the combination logic performs AND decision on the absolute value decision result and the relative value decision result, and determines an early warning decision result.
Further, the joint logic performs an and or decision on the early warning results of the two cues, and the decision result finally determines whether the monitoring device sends out early warning instructions.
The early warning strategy can be dynamically adjusted according to field reality, and can also be used for iteratively optimizing threshold parameters according to field feedback.
Further, for key equipment, the early warning strategy can properly reduce the judgment threshold value, and the joint logic adopts OR logic. For common equipment, the early warning strategy can properly improve the judgment threshold value, and the joint logic strategy uses AND logic.
And 105, determining the early warning grade of the transformer according to a preset early warning strategy and an early warning decision result.
Optionally, referring to fig. 4, determining the early warning level of the transformer according to the preset early warning policy and the early warning decision result includes:
judging whether the amplitude values of the high-frequency partial discharge signals and the ultrasonic partial discharge signals exceed a preset amplitude threshold value at the same time;
under the condition that the amplitude of the high-frequency and ultrasonic partial discharge signals exceeds an amplitude threshold at the same time, the discharge times of the high-frequency and ultrasonic partial discharge signals in a plurality of frequency waves are monitored, and whether the discharge times exceed the preset discharge times threshold is judged;
and under the condition that the discharge times exceeds a discharge times threshold value, determining the early warning level as a first-stage early warning.
Optionally, referring to fig. 5, determining the early warning level of the transformer according to a preset early warning policy and an early warning decision result, further includes:
after a preset time period with the early warning level of primary early warning, monitoring the discharge intensity change rate of high-frequency and ultrasonic partial discharge signals in a first preset time range, and judging whether the discharge intensity change rate exceeds a preset discharge intensity change rate threshold;
under the condition that the discharge intensity change rate exceeds a discharge intensity change rate threshold value, identifying discharge types of the high-frequency and ultrasonic partial discharge signals, and judging whether the high-frequency and ultrasonic partial discharge signals have discharge signals at the same time;
under the condition that discharge signals exist in the high-frequency and ultrasonic partial discharge signals at the same time, the early warning level is modified into a second-level early warning.
Optionally, referring to fig. 6, determining the early warning level of the transformer according to a preset early warning policy and an early warning decision result, further includes:
under the condition that the early warning level is a secondary early warning, judging whether the discharge intensity of the high-frequency and ultrasonic partial discharge signals exceeds a preset discharge quantity threshold value;
under the condition that the discharge intensity exceeds the discharge quantity threshold value, determining a first judgment condition to judge that the discharge quantity within a second preset time range is larger than or equal to the discharge quantity threshold value;
determining the second judgment condition as judging that the discharge quantity in the third preset time range meets the exponential increase;
determining a third judging condition to judge that the increase of the discharge quantity exceeds a preset percentage in a fourth preset time range;
and under the condition that any one of the first judging condition, the second judging condition and the third judging condition is met, modifying the early warning level into three-level early warning and sending a tripping signal.
Specifically, the early warning strategy aims to reliably pre-judge high-energy discharge of the transformer, and extends the growth slope, the positioning, the acoustic-electric signal linkage and the like based on three parameters such as the amplitude, the phase and the pulse number of three signals to form six parameters so as to further improve the strategy reliability and the anti-interference capability.
Further, the early warning strategy carries out logic judgment according to the two signals and the six parameters, judges three stages of discharge before insulation breakdown, and correspondingly gives out three stages of early warning signals and tripping signals.
Further, the 'slight early warning (three-stage)' is mainly used for eliminating interference signals in the micro energy discharge stage, and is distinguished by judging the continuity of the discharge signal amplitude; the important point of the 'severe early warning (secondary)' is to exclude internal discharge of the transformer, namely suspension discharge and corona discharge, which does not endanger the main insulation, in the low-energy discharge stage; the critical alarm (primary) is mainly used for judging that the transformer is in a high-energy discharge stage, the main insulation is suddenly destroyed, an insulation breakdown fault is about to occur, a tripping signal is sent out, and the transformer is actively protected in time.
The comprehensive monitoring and early warning method for the 500kV and above transformer provided by the invention has the advantages of high reliability and strong anti-interference capability. In the test application, the device can measure the amplitude and the frequency of the high-frequency and ultrasonic partial discharge signals in real time through the monitoring device before the insulation breakdown of defects such as turn-to-turn and surface discharge and the like, and judge two clues of an absolute threshold value and a relative threshold value in real time, so that the stage where the discharge is developed is correctly identified, corresponding early warning can be correctly sent out in each stage, and finally the comprehensive monitoring early warning of the large-scale transformer is realized.
Therefore, the invention provides a warning strategy of 'two clues', 'two signals', 'three judgments', 'three logics', wherein the strategy is based on high-frequency and ultrasonic discharge signals, can accurately acquire fault discharge characteristics before the internal fault insulation breakdown of the transformer, and accordingly carries out logic judgment, rapidly and reliably analyzes the fault discharge development condition, and when the warning strategy judges that the fault discharge has evolved to high-energy discharge, the early warning strategy judges that the fault discharge is about to break down, and carries out protection tripping action. The invention fully plays the advantages of high response speed and high early discharge detection rate of the comprehensive monitoring device, and can realize comprehensive monitoring and early warning of transformers of 500kV and above.
Exemplary apparatus
Fig. 7 is a schematic structural diagram of a comprehensive monitoring and early warning device for a transformer according to an exemplary embodiment of the present invention. As shown in fig. 7, the apparatus 700 includes:
the monitoring module 710 is configured to monitor, in real time, the amplitude and the frequency of the high-frequency and ultrasonic partial discharge signals of the transformer within a preset time range, where the transformer is 500kV or more;
the first determining module 720 is configured to determine an absolute value decision result by respectively performing absolute value judgment on the amplitude and the frequency of the high-frequency partial discharge signal and the ultrasonic partial discharge signal by using a preset relative threshold;
the second determining module 730 is configured to determine a relative value decision result by respectively performing relative value judgment on the amplitude and the frequency of the high-frequency partial discharge signal and the ultrasonic partial discharge signal by using a preset relative threshold;
the third determining module 740 is configured to perform and/or decision on the absolute value decision result and the relative value decision result through preset joint logic, and determine an early warning decision result;
and a fourth determining module 750, configured to determine an early warning level of the transformer according to a preset early warning policy and an early warning decision result.
Optionally, the first determining module 720 includes:
the first determining submodule is used for performing AND or decision on the amplitude and the frequency of the high-frequency partial discharge signals and the ultrasonic partial discharge signals by utilizing the relative threshold value to determine an absolute value result.
Optionally, the second determining module 730 includes:
the second determining submodule is used for carrying out relative logic judgment on the amplitude and the frequency of the high-frequency partial discharge signals and the ultrasonic partial discharge signals by utilizing the relative threshold value and determining a relative value decision result.
Optionally, the third determining module 740 includes:
the third determining submodule is used for carrying out or decision on the absolute value decision result and the relative value decision result by combining logic when the transformer is key equipment, and determining an early warning decision result;
and the fourth determination submodule is used for carrying out AND decision on the absolute value decision result and the relative value decision result by the joint logic when the transformer is common equipment, and determining an early warning decision result.
Optionally, the fourth determining module 750 includes:
the first judging submodule is used for judging whether the amplitude values of the high-frequency partial discharge signals and the ultrasonic partial discharge signals exceed a preset amplitude threshold value at the same time;
the second judging sub-module is used for monitoring the discharge times of the high-frequency and ultrasonic partial discharge signals in the preset times of the multiple cycles under the condition that the amplitudes of the high-frequency and ultrasonic partial discharge signals exceed an amplitude threshold at the same time, and judging whether the discharge times exceed the preset discharge times threshold;
and the fifth determining submodule is used for determining the early warning level as a first-stage early warning under the condition that the discharge times exceed the discharge times threshold value.
Optionally, the fourth determining module 750 further includes:
the third judging sub-module is used for monitoring the discharge intensity change rate of the high-frequency and ultrasonic partial discharge signals in the first preset time range after the preset time period with the early warning level of the first-stage early warning, and judging whether the discharge intensity change rate exceeds a preset discharge intensity change rate threshold value or not;
the fourth judging submodule is used for identifying the discharge types of the high-frequency and ultrasonic partial discharge signals under the condition that the discharge intensity change rate exceeds the discharge intensity change rate threshold value and judging whether the discharge signals exist in the high-frequency and ultrasonic partial discharge signals at the same time or not;
the first modification submodule is used for modifying the early warning level into the second-level early warning under the condition that the discharge signals exist in the high-frequency and ultrasonic partial discharge signals at the same time.
Optionally, the fourth determining module 750 further includes:
a fifth judging sub-module, configured to judge whether the discharge intensity of the high-frequency and ultrasonic partial discharge signals exceeds a preset discharge amount threshold under the condition that the early warning level is a second-level early warning;
the first judgment condition determining module is used for determining that the discharge quantity within the second preset time range is larger than or equal to the discharge quantity threshold value under the condition that the discharge intensity exceeds the discharge quantity threshold value;
the second judgment condition determining module is used for determining that the second judgment condition is that the discharge quantity in the third preset time range meets the exponential increase;
the third judgment condition determining module is used for determining that the third judgment condition is that the increase of the discharge quantity exceeds a preset percentage in a fourth preset time range;
and the second modification submodule is used for modifying the early warning level into three-level early warning and sending a tripping signal under the condition that any one of the first judgment condition, the second judgment condition and the third judgment condition is met.
Exemplary electronic device
Fig. 8 is a structure of an electronic device provided in an exemplary embodiment of the present invention. As shown in fig. 8, the electronic device 80 includes one or more processors 81 and memory 82.
The processor 81 may be a Central Processing Unit (CPU) or other form of processing unit having data processing and/or instruction execution capabilities, and may control other components in the electronic device to perform desired functions.
In addition, the input device 83 may also include, for example, a keyboard, a mouse, and the like.
The output device 84 can output various information to the outside. The output means 84 may include, for example, a display, speakers, a printer, and a communication network and remote output devices connected thereto, etc.
Of course, only some of the components of the electronic device relevant to the present invention are shown in fig. 8 for simplicity, components such as buses, input/output interfaces, etc. being omitted. In addition, the electronic device may include any other suitable components depending on the particular application.
Exemplary computer program product and computer readable storage Medium
In addition to the methods and apparatus described above, embodiments of the invention may also be a computer program product comprising computer program instructions which, when executed by a processor, cause the processor to perform steps in a method according to various embodiments of the invention described in the "exemplary methods" section of this specification.
The computer program product may write program code for performing operations of embodiments of the present invention in any combination of one or more programming languages, including an object oriented programming language such as Java, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device, partly on a remote computing device, or entirely on the remote computing device or server.
Furthermore, embodiments of the present invention may also be a computer-readable storage medium, having stored thereon computer program instructions which, when executed by a processor, cause the processor to perform the steps in a method of mining history change records according to various embodiments of the present invention described in the "exemplary methods" section above in this specification.
The computer readable storage medium may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium can include, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium would include the following: an electrical connection having one or more wires, a portable disk, a hard disk, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The basic principles of the present invention have been described above in connection with specific embodiments, however, it should be noted that the advantages, benefits, effects, etc. mentioned in the present invention are merely examples and not intended to be limiting, and these advantages, benefits, effects, etc. are not to be considered as essential to the various embodiments of the present invention. Furthermore, the specific details disclosed herein are for purposes of illustration and understanding only, and are not intended to be limiting, as the invention is not necessarily limited to practice with the above described specific details.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different manner from other embodiments, so that the same or similar parts between the embodiments are mutually referred to. For system embodiments, the description is relatively simple as it essentially corresponds to method embodiments, and reference should be made to the description of method embodiments for relevant points.
The block diagrams of the devices, systems, apparatuses, systems according to the present invention are merely illustrative examples and are not intended to require or imply that the connections, arrangements, configurations must be made in the manner shown in the block diagrams. As will be appreciated by one of skill in the art, the devices, systems, apparatuses, systems may be connected, arranged, configured in any manner. Words such as "including," "comprising," "having," and the like are words of openness and mean "including but not limited to," and are used interchangeably therewith. The terms "or" and "as used herein refer to and are used interchangeably with the term" and/or "unless the context clearly indicates otherwise. The term "such as" as used herein refers to, and is used interchangeably with, the phrase "such as, but not limited to.
The method and system of the present invention may be implemented in a number of ways. For example, the methods and systems of the present invention may be implemented by software, hardware, firmware, or any combination of software, hardware, firmware. The above-described sequence of steps for the method is for illustration only, and the steps of the method of the present invention are not limited to the sequence specifically described above unless specifically stated otherwise. Furthermore, in some embodiments, the present invention may also be embodied as programs recorded in a recording medium, the programs including machine-readable instructions for implementing the methods according to the present invention. Thus, the present invention also covers a recording medium storing a program for executing the method according to the present invention.
It is also noted that in the systems, devices and methods of the present invention, components or steps may be disassembled and/or assembled. Such decomposition and/or recombination should be considered as equivalent aspects of the present invention. The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the invention. Thus, the present invention is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit embodiments of the invention to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.
Claims (10)
1. The comprehensive monitoring and early warning method for the transformer is characterized by comprising the following steps of:
monitoring the amplitude and the frequency of high-frequency and ultrasonic partial discharge signals of a transformer in real time within a preset time range, wherein the transformer is 500kV or above;
respectively judging absolute values of the amplitude and the frequency of the high-frequency and ultrasonic partial discharge signals by using preset relative thresholds, and determining an absolute value decision result;
respectively judging the relative values of the amplitude and the frequency of the high-frequency partial discharge signals and the ultrasonic partial discharge signals by using a preset relative threshold value, and determining a relative value decision result;
performing and/or decision on the absolute value decision result and the relative value decision result through preset joint logic, and determining an early warning decision result;
and determining the early warning grade of the transformer according to a preset early warning strategy and the early warning decision result.
2. The method of claim 1, wherein the absolute value determination is performed on the amplitude and the frequency of the high-frequency and ultrasonic partial discharge signals by using preset relative thresholds, respectively, and determining an absolute value decision result comprises:
and performing AND or decision on the amplitude and the frequency of the high-frequency and ultrasonic partial discharge signals by using the relative threshold value, and determining the absolute value result.
3. The method of claim 1, wherein the determining the relative decision result by using a preset relative threshold to determine the relative value of the amplitude and the frequency of the high-frequency and ultrasonic partial discharge signals respectively includes:
and carrying out relative logic judgment on the amplitude and the frequency of the high-frequency and ultrasonic partial discharge signals by using the relative threshold value, and determining the relative value decision result.
4. The method of claim 1, wherein determining the early warning decision result by and/or deciding the absolute value decision result and the relative value decision result through preset joint logic comprises:
when the transformer is key equipment, the joint logic performs or decision on the absolute value decision result and the relative value decision result, and determines the early warning decision result;
when the transformer is common equipment, the joint logic performs AND decision on the absolute value decision result and the relative value decision result, and determines the early warning decision result.
5. The method of claim 4, wherein determining the early warning level of the transformer according to a pre-set early warning strategy and the early warning decision result comprises:
judging whether the amplitude values of the high-frequency and ultrasonic partial discharge signals exceed a preset amplitude threshold value at the same time;
under the condition that the amplitude of the high-frequency and ultrasonic partial discharge signals exceeds the amplitude threshold at the same time, monitoring the discharge times of the high-frequency and ultrasonic partial discharge signals in a preset number of cycles, and judging whether the discharge times exceed a preset discharge times threshold;
and under the condition that the discharge times exceeds the discharge times threshold value, determining the early warning level as a first-stage early warning.
6. The method of claim 5, wherein determining the early warning level of the transformer according to a pre-set early warning strategy and the early warning decision result, further comprises:
after the early warning level is a preset time period of primary early warning, monitoring the discharge intensity change rate of the high-frequency and ultrasonic partial discharge signals in a first preset time range, and judging whether the discharge intensity change rate exceeds a preset discharge intensity change rate threshold;
under the condition that the discharge intensity change rate exceeds the discharge intensity change rate threshold, identifying discharge types of the high-frequency and ultrasonic partial discharge signals, and judging whether the high-frequency and ultrasonic partial discharge signals have discharge signals at the same time;
and under the condition that discharge signals exist in the high-frequency and ultrasonic partial discharge signals at the same time, modifying the early warning level into a second-level early warning.
7. The method of claim 6, wherein determining the early warning level of the transformer according to a pre-set early warning strategy and the early warning decision result, further comprises:
judging whether the discharge intensity of the high-frequency and ultrasonic partial discharge signals exceeds a preset discharge quantity threshold value under the condition that the early warning level is a secondary early warning;
determining a first judgment condition to judge that the discharge amount in a second preset time range is greater than or equal to the discharge amount threshold value under the condition that the discharge intensity exceeds the discharge amount threshold value;
determining the second judgment condition as judging that the discharge quantity in the third preset time range meets the exponential increase;
determining a third judging condition to judge that the increase of the discharge quantity exceeds a preset percentage in a fourth preset time range;
and under the condition that any one of the first judging condition, the second judging condition and the third judging condition is met, modifying the early warning level into three-level early warning and sending a tripping signal.
8. The utility model provides a transformer comprehensive monitoring early warning device which characterized in that includes:
the monitoring module is used for monitoring the amplitude and the frequency of the high-frequency and ultrasonic partial discharge signals of the transformer in real time within a preset time range, wherein the transformer is 500kV or more;
the first determining module is used for respectively judging absolute values of the amplitude and the frequency of the high-frequency and ultrasonic partial discharge signals by utilizing a preset relative threshold value and determining an absolute value decision result;
the second determining module is used for judging the relative values of the amplitude and the frequency of the high-frequency partial discharge signals and the ultrasonic partial discharge signals respectively by utilizing a preset relative threshold value, and determining a relative value decision result;
the third determining module is used for performing and/or decision on the absolute value decision result and the relative value decision result through preset joint logic, and determining an early warning decision result;
and the fourth determining module is used for determining the early warning grade of the transformer according to a preset early warning strategy and the early warning decision result.
9. A computer readable storage medium, characterized in that the storage medium stores a computer program for executing the method of any of the preceding claims 1-7.
10. An electronic device, the electronic device comprising:
a processor;
a memory for storing the processor-executable instructions;
the processor is configured to read the executable instructions from the memory and execute the instructions to implement the method of any of the preceding claims 1-7.
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| CN202310051929.6A CN116125232A (en) | 2023-02-02 | 2023-02-02 | Comprehensive monitoring and early warning method, device, medium and equipment for transformer |
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| CN202310051929.6A CN116125232A (en) | 2023-02-02 | 2023-02-02 | Comprehensive monitoring and early warning method, device, medium and equipment for transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117686035A (en) * | 2024-02-01 | 2024-03-12 | 南京南瑞继保工程技术有限公司 | Distributed active defense system, method, equipment and medium of oil filling equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117686035A (en) * | 2024-02-01 | 2024-03-12 | 南京南瑞继保工程技术有限公司 | Distributed active defense system, method, equipment and medium of oil filling equipment |
| CN117686035B (en) * | 2024-02-01 | 2024-04-26 | 南京南瑞继保工程技术有限公司 | Distributed active defense system, method, equipment and medium of oil filling equipment |
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