CN117706345A - Method, device, terminal equipment and storage medium for diagnosing switch three-phase inconsistency - Google Patents
Method, device, terminal equipment and storage medium for diagnosing switch three-phase inconsistency Download PDFInfo
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Abstract
The application is applicable to the technical field of switch diagnosis, and provides a diagnosis method, a device, terminal equipment and a storage medium for switch three-phase inconsistency, wherein the method comprises the following steps: the method comprises the steps of obtaining the switch opening time or the switch closing time of a deflection interval switch during power grid faults; if the switching-off time of the switch is smaller than a first preset threshold value or the switching-on time of the switch is smaller than a second preset threshold value, a diagnosis result with consistent three-phase positions of the deflection interval switch is obtained and output; if the switch opening time is greater than a first preset threshold value or the switch closing time is greater than a second preset threshold value, acquiring the negative sequence current and the zero sequence current of the displacement interval switch; and finally, according to the negative sequence current and the zero sequence current, obtaining and outputting a diagnosis result of the three-phase position of the displacement interval switch. The embodiment of the application can realize real-time monitoring and analysis of the three-phase position of the switch and improve the accuracy of the diagnosis result.
Description
Technical Field
The application belongs to the technical field of switch diagnosis, and particularly relates to a diagnosis method, device, terminal equipment and storage medium for switch three-phase inconsistency.
Background
When the three-phase positions of the switches are inconsistent, negative sequence current components or zero sequence current components can appear in the system, if the negative sequence current components or the zero sequence current components exist for a long time, the power system and the power equipment can be influenced, so that the three-phase positions of the switches are required to be monitored so as to be processed in time when the three-phase positions of the switches are inconsistent, and at present, most of the monitoring on the three-phase positions of the switches has hysteresis, the accuracy is not high, and the real-time monitoring and analysis on the three-phase positions of the switches cannot be realized.
Disclosure of Invention
In view of this, the embodiments of the present application provide a method, an apparatus, a terminal device, and a storage medium for diagnosing a three-phase inconsistency of a switch, so as to solve the problem that in the prior art, real-time monitoring and analysis of a three-phase position of the switch cannot be achieved.
A first aspect of an embodiment of the present application provides a method for diagnosing a switching three-phase inconsistency, including:
acquiring the switch opening time or the switch closing time of a deflection interval switch when the power grid fails;
if the switch opening time is smaller than a first preset threshold value or the switch closing time is smaller than a second preset threshold value, a diagnosis result of consistent three-phase positions of the deflection interval switch is obtained and output;
if the switch opening time is greater than a first preset threshold value or the switch closing time is greater than a second preset threshold value, acquiring the negative sequence current and the zero sequence current of the displacement interval switch;
and according to the negative sequence current and the zero sequence current, obtaining and outputting a diagnosis result of the three-phase position of the displacement interval switch.
A second aspect of the embodiments of the present application provides a diagnostic apparatus for switching three-phase inconsistency, the diagnostic apparatus for switching three-phase inconsistency including:
the first acquisition module is used for acquiring the switch opening time or the switch closing time of the variable-position interval switch when the power grid fails;
the first diagnosis module is used for obtaining and outputting a diagnosis result of consistent three-phase positions of the deflection interval switch if the switch opening time is smaller than a first preset threshold value or the switch closing time is smaller than a second preset threshold value;
the second acquisition module is used for acquiring the negative sequence current and the zero sequence current of the deflection interval switch if the switch opening time is greater than a first preset threshold value or the switch closing time is greater than a second preset threshold value;
and the second diagnosis module is used for obtaining and outputting the diagnosis result of the three-phase position of the displacement interval switch according to the negative sequence current and the zero sequence current.
A third aspect of the embodiments of the present application provides a terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the method for diagnosing switching three-phase inconsistencies according to the first aspect of the embodiments of the present application when the computer program is executed.
A fourth aspect of the embodiments of the present application provides a computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of a method for diagnosing a switching three-phase inconsistency according to the first aspect of the embodiments of the present application.
According to the diagnosis method for the three-phase inconsistency of the switch, which is provided by the first aspect of the embodiment of the application, the switch opening time or the switch closing time of the deflection interval switch is obtained when the power grid fails; if the switching-off time of the switch is smaller than a first preset threshold value or the switching-on time of the switch is smaller than a second preset threshold value, a diagnosis result with consistent three-phase positions of the deflection interval switch is obtained and output; if the switch opening time is greater than a first preset threshold value or the switch closing time is greater than a second preset threshold value, acquiring the negative sequence current and the zero sequence current of the displacement interval switch; and finally, according to the negative sequence current and the zero sequence current, obtaining and outputting a diagnosis result of the three-phase position of the deflection interval switch, so that the real-time monitoring and analysis of the three-phase position of the switch can be realized, and the accuracy of the diagnosis result is improved.
It will be appreciated that the advantages of the second to fourth aspects may be found in the relevant description of the first aspect and are not repeated here.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following description will briefly introduce the drawings that are needed in the embodiments or the description of the prior art, it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a first flow chart of a method for diagnosing switching three-phase inconsistency according to an embodiment of the present application;
FIG. 2 is a second flow diagram of a method for diagnosing switching three-phase inconsistency according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a three-phase inconsistency diagnosis device provided in an embodiment of the present application;
fig. 4 is a schematic structural diagram of a terminal device provided in an embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system configurations, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
In addition, in the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise. "plurality" means "two" or "more than two".
When the three-phase positions of the switches are inconsistent, negative sequence current components or zero sequence current components can appear in the power system, if the negative sequence current components or the zero sequence current components exist for a long time, the influence on the power system and the power equipment can be caused, therefore, the three-phase positions of the switches are required to be monitored so as to be processed in time when the three-phase positions of the switches are inconsistent, at present, most of the monitoring on the three-phase positions of the switches has hysteresis, the accuracy is not high, and the real-time monitoring and analysis on the three-phase positions of the switches cannot be realized.
The embodiment of the application provides a diagnosis method for three-phase inconsistency of a switch, which is characterized by acquiring the switch opening time or the switch closing time of a deflection interval switch when a power grid fails; if the switching-off time of the switch is smaller than a first preset threshold value or the switching-on time of the switch is smaller than a second preset threshold value, a diagnosis result with consistent three-phase positions of the deflection interval switch is obtained and output; if the switch opening time is greater than a first preset threshold value or the switch closing time is greater than a second preset threshold value, acquiring the negative sequence current and the zero sequence current of the displacement interval switch; finally, according to the negative sequence current and the zero sequence current, a diagnosis result of the three-phase position of the deflection interval switch is obtained and output.
Example 1
As shown in fig. 1, the method for diagnosing switching three-phase inconsistency provided in the embodiment of the present application includes the following steps S1 to S4:
step S1, acquiring the switch opening time or the switch closing time of the deflection interval switch during power grid faults, and entering step S2 or S3.
In application, when a power grid fails, the switching-off time (namely the relative time between the failure zero time and the switching-off time) of the deflection interval switch can be obtained by extracting data of the failure zero time and the switching-off time acquired by the intelligent recorder; and acquiring the switching-on time of the deflection interval switch by extracting the data (namely the relative time between the fault zero time and the switching-on time) of the fault zero time and the switching-on time acquired by the intelligent recorder.
In application, the intelligent recorder is equipment integrating fault recording, network recording analysis, secondary system visualization and intelligent operation and maintenance functions, and consists of an acquisition unit and a management unit; the acquisition unit acquires analog quantity, switching value and communication message and has the functions of wave record file generation, network message analysis and communication; the management unit consists of functional modules such as wave recording file analysis, network message analysis and result display, secondary system visualization, intelligent operation and maintenance and the like, and the secondary system visualization functional modules comprise functions such as secondary equipment state online monitoring, secondary virtual loop online monitoring, secondary process layer optical fiber loop online monitoring, secondary loop fault diagnosis and positioning and the like; the intelligent operation and maintenance function module comprises functions of substation configuration file management and control, secondary overhaul auxiliary measure, fixed value management, fault information management, comprehensive analysis and the like.
In one embodiment, step S1 is preceded by:
acquiring working data of each interval switch at a preset time interval, wherein the working data comprises a current analog quantity signal, a protection action signal, a reclosing action signal, a switch opening signal and a switch closing signal;
and determining a displacement interval switch according to the switch opening signal or the switch closing signal.
In application, working data of each interval switch at a preset time interval can be obtained through a wave recording file generated by an acquisition unit of the intelligent wave recorder, and the working data specifically comprise a current analog quantity signal, a voltage analog quantity signal protection action signal, a reclosing action signal, a switch opening signal, a switch closing signal and the like, which are only examples and are not limiting.
In application, when working data of each interval switch is acquired, the working data may be acquired in real time, or may be acquired according to a preset time interval, which is not limited herein.
In application, a specific displacement interval switch (the displacement interval switch may be one or a plurality of, but is not limited to, here) is determined by analyzing a switch opening signal or a switch closing signal of each interval switch, and then the switch opening time or the switch closing time of the displacement interval switch is analyzed, so as to determine whether the three-phase positions of the displacement interval switches are consistent.
In one embodiment, step S1 includes:
and obtaining the switch opening time or the switch closing time of the deflection interval switch according to whether the protection action signal and/or the reclosing action signal occur.
In application, when the switch opening time or the switch closing time of the displacement interval switch is obtained, the switch opening time or the switch closing time of the displacement interval switch can be obtained according to the action type (switch opening or switch closing) of the displacement interval switch when no protection action signal (protection tripping signal) appears or no protection action signal appears before the displacement of the displacement interval switch occurs; when only a protection action signal (a protection tripping signal) appears, acquiring the switch opening time or the switch closing time of the displacement interval switch according to the action type (switch opening or switch closing) of the displacement interval switch; the protection action signal (protection tripping signal) and the reclosing action signal can also appear simultaneously, and when the change of the three-phase position signal of the displacement interval switch (namely, the position of at least two phases of switch in the A phase, the B phase and the C phase is displaced), the switch opening time or the switch closing time of the displacement interval switch can be obtained according to the action type (switch opening or switch closing) of the displacement interval switch.
And S2, if the switch opening time is smaller than a first preset threshold value or the switch closing time is smaller than a second preset threshold value, obtaining and outputting a diagnosis result of consistent three-phase positions of the deflection interval switch.
In application, if the switch opening time of the displacement interval switch is obtained in the step S1, comparing the switch opening time with a first preset threshold value, and if the switch opening time is smaller than the first preset threshold value, obtaining and outputting a diagnosis result of consistent three-phase positions of the displacement interval switch; if the switch opening time is greater than the first preset threshold, step S3 is entered.
In application, the first preset threshold may be set according to practical situations, which is not limited herein.
In application, if the switch-on time of the displacement interval switch is obtained in the step S1, the switch-on time is compared with a second preset threshold, if the switch-on time is smaller than the second preset threshold, a diagnosis result with consistent three-phase positions of the displacement interval switch is obtained and output, and if the switch-on time is larger than the second preset threshold, the step S3 is entered.
In application, the second preset threshold may be set according to practical situations, which is not limited herein.
And step S3, if the switch opening time is greater than a first preset threshold value or the switch closing time is greater than a second preset threshold value, acquiring the negative sequence current and the zero sequence current of the displacement interval switch, and entering step S4.
In the application, if the obtained switching-off time of the switch is larger than a first preset threshold value, obtaining a negative sequence current and a zero sequence current generated by the displacement interval switch during switching-off; if the obtained switching-on time is larger than a second preset threshold value, obtaining the negative sequence current and the zero sequence current generated by the displacement interval switch during switching-on.
In one embodiment, the negative sequence current is calculated as follows:
wherein I is 2 Denotes a negative sequence current, ia denotes an a-phase current, ib denotes a B-phase current, ic denotes a C-phase current, m=e j *2π/3 E represents a natural constant, j represents an imaginary part, j x j= -1, and pi represents a circumference ratio.
In application, the negative sequence current generated by the displacement interval switch during opening or closing can be obtained by calculation according to the calculation formula of the negative sequence current.
In one embodiment, the calculation formula of the zero sequence current is as follows:
wherein I is 0 Representing zero sequence current, ia representing a phase current, ib representing B phase current, ic representing C phase current.
In application, the zero sequence current generated by the displacement interval switch during opening or closing can be obtained by calculation according to the calculation formula of the zero sequence current.
And S4, obtaining and outputting a diagnosis result of the three-phase position of the displacement interval switch according to the negative sequence current and the zero sequence current.
In application, after the negative sequence current and the zero sequence current generated by the position-changing interval switch during switching off are obtained, the diagnosis result of consistent or inconsistent three-phase positions of the position-changing interval switch can be obtained and output to the user side by comparing the magnitude of the negative sequence current with a third preset threshold value and the magnitude of the zero sequence current with a fourth preset threshold value.
In application, after the negative sequence current and the zero sequence current generated by the displacement interval switch during closing are obtained, the diagnosis result of consistent or inconsistent three-phase positions of the displacement interval switch can be obtained and output to the user side by comparing the magnitude of the negative sequence current with a third preset threshold value and the magnitude of the zero sequence current with a fourth preset threshold value.
In one embodiment, as shown in fig. 2, step S4 includes the following steps S41 or S42:
and step S41, if the negative sequence current is larger than a third preset threshold value and the zero sequence current is larger than a fourth preset threshold value, obtaining and outputting a diagnosis result representing that the three-phase positions of the deflection interval switches are inconsistent.
And step S42, if the negative sequence current is larger than a third preset threshold value and the zero sequence current is smaller than a fourth preset threshold value, or the negative sequence current is smaller than the third preset threshold value and the zero sequence current is larger than the fourth preset threshold value, or the negative sequence current is smaller than the third preset threshold value and the zero sequence current is smaller than the fourth preset threshold value, a diagnosis result representing that the three-phase positions of the deflection interval switch are consistent is obtained and output.
In the application, after the negative sequence current and the zero sequence current generated by the deflection interval switch during switching off are obtained, if the negative sequence current is larger than a third preset threshold value and the zero sequence current is larger than a fourth preset threshold value, a diagnosis result representing that the three-phase positions of the deflection interval switch are inconsistent is obtained and is output to a user side.
In the application, after obtaining the negative sequence current and the zero sequence current generated by the displacement interval switch during switching off, if the negative sequence current is larger than a third preset threshold value and the zero sequence current is smaller than a fourth preset threshold value, obtaining a diagnosis result representing that the three-phase positions of the displacement interval switch are consistent and outputting the diagnosis result to a user side; if the negative sequence current is smaller than a third preset threshold value and the zero sequence current is larger than a fourth preset threshold value, a diagnosis result representing consistent three-phase positions of the deflection interval switch is obtained and output to a user side; if the negative sequence current is smaller than the third preset threshold value and the zero sequence current is smaller than the fourth preset threshold value, a diagnosis result representing that the three-phase positions of the deflection interval switches are consistent is obtained and output to the user side.
In application, after obtaining the negative sequence current and the zero sequence current generated by the displacement interval switch during closing, if the negative sequence current is greater than a third preset threshold value and the zero sequence current is greater than a fourth preset threshold value, obtaining a diagnosis result representing that the three-phase positions of the displacement interval switch are inconsistent and outputting the diagnosis result to a user side.
In application, after obtaining a negative sequence current and a zero sequence current generated by the displacement interval switch during switching-on, if the negative sequence current is larger than a third preset threshold value and the zero sequence current is smaller than a fourth preset threshold value, obtaining a diagnosis result representing that the three-phase positions of the displacement interval switch are consistent and outputting the diagnosis result to a user side; if the negative sequence current is smaller than a third preset threshold value and the zero sequence current is larger than a fourth preset threshold value, a diagnosis result representing consistent three-phase positions of the deflection interval switch is obtained and output to a user side; if the negative sequence current is smaller than the third preset threshold value and the zero sequence current is smaller than the fourth preset threshold value, a diagnosis result representing that the three-phase positions of the deflection interval switches are consistent is obtained and output to the user side.
In application, the third preset threshold may be set according to practical situations, which is not limited herein.
In application, the fourth preset threshold may be set according to practical situations, which is not limited herein.
In one embodiment, step S4 is followed by:
storing the diagnosis result;
and/or sending out abnormal state alarm information according to the diagnosis result representing that the three-phase positions of the deflection interval switches are inconsistent.
In the application, after the diagnosis result representing consistent three-phase positions of the deflection interval switch is obtained, the diagnosis result is stored; after the diagnosis result of inconsistent three-phase positions of the deflection interval switch is obtained, the diagnosis result is stored, and abnormal state alarm information is sent out, so that a worker can quickly position the deflection interval switch according to the abnormal state alarm information, and overhaul treatment is timely carried out.
In one embodiment, step S1 may specifically be further to obtain a phase current extinction time or a phase current recovery time of the power grid fault time-varying bit interval switch; step S2 may specifically be to obtain and output a diagnosis result of the consistent three-phase positions of the displacement interval switch if the phase current vanishing time is less than a fifth preset threshold or the phase current recovery time is less than a sixth preset threshold; step S3 may specifically be that if the phase current vanishing time is greater than a fifth preset threshold, or the phase current recovery time is greater than a sixth preset threshold, then obtaining a negative sequence current and a zero sequence current of the displacement interval switch, and then entering step S4; step S4 may specifically be to obtain and output a diagnosis result of the three-phase position of the displacement interval switch according to the negative sequence current and the zero sequence current.
Step S4 may further include: if the negative sequence current is larger than a third preset threshold value and the zero sequence current is larger than a fourth preset threshold value, a diagnosis result representing that the three-phase positions of the deflection interval switches are inconsistent is obtained and output; if the negative sequence current is larger than a third preset threshold value and the zero sequence current is smaller than a fourth preset threshold value, or the negative sequence current is smaller than the third preset threshold value and the zero sequence current is larger than the fourth preset threshold value, or the negative sequence current is smaller than the third preset threshold value and the zero sequence current is smaller than the fourth preset threshold value, a diagnosis result representing that the three-phase positions of the deflection interval switch are consistent is obtained and output.
In the application, the phase current vanishing time is the relative time from the zero moment of the fault to the phase current vanishing moment; the phase current recovery time is the relative time from the zero point of failure to the phase current recovery point.
In application, the fifth preset threshold and the sixth preset threshold may be set according to actual situations, which is not limited herein.
In one embodiment, step S1 may specifically further be to obtain a switch opening delay or a switch closing delay of the power grid fault time-varying bit interval switch; step S2 may specifically be that if the switch opening delay is less than a seventh preset threshold, or the switch closing delay is less than an eighth preset threshold, a diagnosis result with consistent three-phase positions of the deflection interval switch is obtained and output; step S3 may specifically be that if the switch opening delay is greater than a seventh preset threshold, or the switch closing delay is greater than an eighth preset threshold, then obtaining a negative sequence current and a zero sequence current of the displacement interval switch, and then entering step S4; step S4 may specifically be to obtain and output a diagnosis result of the three-phase position of the displacement interval switch according to the negative sequence current and the zero sequence current.
The corresponding step S4 may further include: if the negative sequence current is larger than a third preset threshold value and the zero sequence current is larger than a fourth preset threshold value, a diagnosis result representing that the three-phase positions of the deflection interval switches are inconsistent is obtained and output; if the negative sequence current is larger than a third preset threshold value and the zero sequence current is smaller than a fourth preset threshold value, or the negative sequence current is smaller than the third preset threshold value and the zero sequence current is larger than the fourth preset threshold value, or the negative sequence current is smaller than the third preset threshold value and the zero sequence current is smaller than the fourth preset threshold value, a diagnosis result representing that the three-phase positions of the deflection interval switch are consistent is obtained and output.
In application, the switch opening time delay is the relative time from the switch opening time to the phase current vanishing time; the switch closing time delay is the relative time from the switch closing time to the phase current recovery time.
In application, the seventh preset threshold and the eighth preset threshold may be set according to actual situations, which is not limited herein.
What has not been described in detail here can be taken into consideration in the preceding embodiments.
The diagnosis method for the three-phase inconsistency of the switch can rapidly and accurately position and shift the position of the interval switch and the three-phase inconsistency, and can be applied to a plurality of switches of various substations, such as a plurality of breaker switches of a 500kV substation, a plurality of breaker switches of a 220kV substation, a plurality of breaker switches of a 110kV substation and the like, and has wide application range and strong adaptability.
In applications, the user side may be a mobile phone, a tablet computer, a wearable device, an Augmented Reality (AR)/Virtual Reality (VR) device, a notebook computer, an Ultra-Mobile Personal Computer (UMPC), a netbook, a personal digital assistant (Personal Digital Assistant, PDA), and the like.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic of each process, and should not limit the implementation process of the embodiment of the present application in any way.
Example two
The embodiment of the application also provides a diagnosis device for the three-phase inconsistency of the switch, which is used for executing the method steps in the embodiment of the diagnosis method for the three-phase inconsistency of the switch. The device may be a virtual device (virtual appliance) in the terminal device, executed by a processor of the terminal device, or the terminal device itself.
As shown in fig. 3, the switching three-phase inconsistent diagnosis device 100 provided in the embodiment of the present application includes a first acquisition module 101, a first diagnosis module 102, a second acquisition module 103, and a second diagnosis module 104.
The first obtaining module 101 is configured to obtain a switch opening time or a switch closing time of the variable bit interval switch when the power grid fails;
the first diagnosis module 102 is configured to obtain and output a diagnosis result of consistent three-phase positions of the variable-position interval switch if the switch opening time is less than a first preset threshold or the switch closing time is less than a second preset threshold;
the second obtaining module 103 is configured to obtain the negative sequence current and the zero sequence current of the displacement interval switch if the switch opening time is greater than a first preset threshold value or the switch closing time is greater than a second preset threshold value;
and the second diagnosis module 104 is configured to obtain and output a diagnosis result of the three-phase position of the displacement interval switch according to the negative sequence current and the zero sequence current.
In one embodiment, the diagnostic device 100 further comprises a storage module 105 for:
storing the diagnosis result;
and/or sending out abnormal state alarm information according to the diagnosis result representing that the three-phase positions of the deflection interval switches are inconsistent.
In one embodiment, the first obtaining module 101 is specifically configured to:
acquiring working data of each interval switch at a preset time interval, wherein the working data comprises a current analog quantity signal, a protection action signal, a reclosing action signal, a switch opening signal and a switch closing signal;
and determining a displacement interval switch according to the switch opening signal or the switch closing signal.
In one embodiment, the first obtaining module 101 is specifically further configured to:
and obtaining the switch opening time or the switch closing time of the deflection interval switch according to whether the protection action signal and/or the reclosing action signal occur.
In one embodiment, the second obtaining module 103 is specifically configured to:
obtaining a negative sequence current, wherein the calculation formula of the negative sequence current is as follows:
wherein I is 2 Denotes a negative sequence current, ia denotes an a-phase current, ib denotes a B-phase current, ic denotes a C-phase current, m=e j *2π/3 E represents a natural constant, j represents an imaginary part, j x j= -1, and pi represents a circumference ratio.
In one embodiment, the second obtaining module 103 is specifically further configured to:
the method comprises the steps of obtaining zero-sequence current, wherein the calculation formula of the zero-sequence current is as follows:
wherein I is 0 Representing zero sequence current, ia representing a phase current, ib representing B phase current, ic representing C phase current.
In one embodiment, the second diagnostic module 104 is specifically configured to:
if the negative sequence current is larger than a third preset threshold value and the zero sequence current is larger than a fourth preset threshold value, a diagnosis result representing that the three-phase positions of the deflection interval switches are inconsistent is obtained and output;
if the negative sequence current is larger than a third preset threshold value and the zero sequence current is smaller than a fourth preset threshold value, or the negative sequence current is smaller than the third preset threshold value and the zero sequence current is larger than the fourth preset threshold value, or the negative sequence current is smaller than the third preset threshold value and the zero sequence current is smaller than the fourth preset threshold value, a diagnosis result representing that the three-phase positions of the deflection interval switch are consistent is obtained and output.
In application, each unit in the above device may be a software program module, or may be implemented by different logic circuits integrated in a processor or separate physical components connected with the processor, or may be implemented by multiple distributed processors.
Example III
As shown in fig. 4, the embodiment of the present application further provides a terminal device 200, including: at least one processor 201 (only one processor is shown in fig. 4), a memory 202, a computer program 203 stored in the memory 202 and executable on the at least one processor 201, the processor 201 implementing the steps in the various method embodiments described above when executing the computer program 203.
In applications, the terminal device may include, but is not limited to, a processor, a memory, fig. 4 is merely an example of the terminal device, and does not constitute limitation of the terminal device, and may include more or less components than those illustrated, or some components may be combined, or different components, for example, a man-machine interaction device, an input/output device, a network access device, and the like, where the network access device may include a communication module for the terminal device to communicate with the user terminal.
In an application, the processor may be a central processing unit (Central Processing Unit, CPU), it may also be other general purpose processor, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), field-programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, etc., and it may be a timing controller (Timing Controller, TCON), for example. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
In applications, the memory may in some embodiments be an internal storage unit of the terminal device, e.g. a hard disk or a memory of the terminal device. The memory may in other embodiments also be an external storage device of the terminal device, for example a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash Card (Flash Card) or the like, which are provided on the terminal device. The memory may also include both internal storage units of the terminal device and external storage devices. The memory is used to store an operating system, application programs, boot Loader (Boot Loader), data, and other programs, etc., such as program code for a computer program, etc. The memory may also be used to temporarily store data that has been output or is to be output.
In application, the communication module may be configured as any device capable of directly or indirectly performing long-distance wired or wireless communication with the user side according to actual needs, for example, the communication module may provide a solution of communication including wireless local area network (Wireless Local Area Networks, WLAN) (such as Wi-Fi network), bluetooth, zigbee, mobile communication network, global navigation satellite system (Global Navigation SatelliteSystem, GNSS), frequency modulation (Frequency Modulation, FM), short-distance wireless communication technology (NearField Communication, NFC), infrared technology (IR), and the like, which are applied to the network device. The communication module may include an antenna, which may have only one element, or may be an antenna array including a plurality of elements. The communication module can receive electromagnetic waves through the antenna, frequency-modulate and filter the electromagnetic wave signals, and send the processed signals to the processor. The communication module can also receive the signal to be transmitted from the processor, frequency modulate and amplify the signal, and convert the signal into electromagnetic waves through the antenna to radiate.
It should be noted that, because the content of information interaction and execution process between the above devices/modules is based on the same concept as the method embodiment of the present application, specific functions and technical effects thereof may be referred to in the method embodiment section, and will not be described herein again.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional modules is illustrated, and in practical application, the above-described functional allocation may be performed by different functional modules according to needs, i.e. the internal structure of the apparatus is divided into different functional modules to perform all or part of the functions described above. The functional modules in the embodiment may be integrated in one processing module, or each module may exist alone physically, or two or more modules may be integrated in one module, where the integrated modules may be implemented in a form of hardware or a form of software functional modules. In addition, the specific names of the functional modules are only for distinguishing from each other, and are not used for limiting the protection scope of the application. The specific working process of the modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
The embodiments of the present application further provide a computer readable storage medium, where a computer program is stored, where the computer program can implement the steps in the above-mentioned method embodiments when executed by a processor.
The present embodiments provide a computer program product enabling a terminal device to carry out the steps of the various method embodiments described above when the computer program product is run on the terminal device.
The integrated modules, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the present application implements all or part of the flow of the method of the above embodiments, and may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, where the computer program may implement the steps of each of the method embodiments described above when executed by a processor. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include at least: any entity or device capable of carrying computer program code to a terminal device, a recording medium, a computer Memory, a Read-Only Memory (ROM), a Random access Memory (Random AccessMemory, RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium. Such as a U-disk, removable hard disk, magnetic or optical disk, etc.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative modules and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, and the division of the modules is merely one logical function division, and there may be another division manner in actual implementation, for example, a plurality of modules or components may be combined or may be integrated into another system. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or modules, which may be in electrical, mechanical or other forms.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (10)
1. A method of diagnosing a switching three-phase inconsistency, the method comprising:
acquiring the switch opening time or the switch closing time of a deflection interval switch when the power grid fails;
if the switch opening time is smaller than a first preset threshold value or the switch closing time is smaller than a second preset threshold value, a diagnosis result of consistent three-phase positions of the deflection interval switch is obtained and output;
if the switch opening time is greater than a first preset threshold value or the switch closing time is greater than a second preset threshold value, acquiring the negative sequence current and the zero sequence current of the displacement interval switch;
and according to the negative sequence current and the zero sequence current, obtaining and outputting a diagnosis result of the three-phase position of the displacement interval switch.
2. The method for diagnosing a three-phase inconsistency of a switch according to claim 1, wherein the step of acquiring the switching-off time or the switching-on time of the variable-position interval switch at the time of the grid fault is preceded by:
acquiring working data of each interval switch at a preset time interval, wherein the working data comprises a current analog quantity signal, a protection action signal, a reclosing action signal, a switch opening signal and a switch closing signal;
and determining a displacement interval switch according to the switch opening signal or the switch closing signal.
3. The method for diagnosing a three-phase inconsistency of a switch according to claim 2, wherein the obtaining and outputting the diagnosis result of the three-phase position of the variable-position interval switch based on the negative sequence current and the zero sequence current includes:
if the negative sequence current is larger than a third preset threshold value and the zero sequence current is larger than a fourth preset threshold value, a diagnosis result representing that the three-phase positions of the deflection interval switches are inconsistent is obtained and output;
if the negative sequence current is larger than a third preset threshold value and the zero sequence current is smaller than a fourth preset threshold value, or the negative sequence current is smaller than the third preset threshold value and the zero sequence current is larger than the fourth preset threshold value, or the negative sequence current is smaller than the third preset threshold value and the zero sequence current is smaller than the fourth preset threshold value, a diagnosis result representing that the three-phase positions of the deflection interval switch are consistent is obtained and output.
4. The method for diagnosing a three-phase inconsistency of a switch according to claim 2, wherein the step of obtaining the switch-off time or the switch-on time of the displacement interval switch at the time of the grid fault comprises the steps of:
and obtaining the switch opening time or the switch closing time of the deflection interval switch according to whether the protection action signal and/or the reclosing action signal occur.
5. A method of diagnosing a switching three-phase inconsistency according to any of claims 1 to 4, wherein the negative sequence current is calculated as follows:
wherein I is 2 Denotes a negative sequence current, ia denotes an a-phase current, ib denotes a B-phase current, ic denotes a C-phase current, m=e j*2π/3 E represents a natural constant, j represents an imaginary part, j x j= -1, and pi represents a circumference ratio.
6. A method for diagnosing a switching three-phase inconsistency according to any of claims 1 to 4, wherein the zero sequence current is calculated as follows:
wherein I is 0 Representing zero sequence current, ia representing a phase current, ib representing B phase current, ic representing C phase current.
7. The method for diagnosing a three-phase inconsistency of the switches according to any of claims 1 to 4, wherein after the diagnosis result of the three-phase position of the variable-position interval switch is obtained and outputted based on the negative sequence current and the zero sequence current, comprising:
storing the diagnosis result;
and/or sending out abnormal state alarm information according to the diagnosis result representing that the three-phase positions of the deflection interval switches are inconsistent.
8. A diagnostic device for switching three-phase inconsistencies, the diagnostic device comprising:
the first acquisition module is used for acquiring the switch opening time or the switch closing time of the variable-position interval switch when the power grid fails;
the first diagnosis module is used for obtaining and outputting a diagnosis result of consistent three-phase positions of the deflection interval switch if the switch opening time is smaller than a first preset threshold value or the switch closing time is smaller than a second preset threshold value;
the second acquisition module is used for acquiring the negative sequence current and the zero sequence current of the deflection interval switch if the switch opening time is greater than a first preset threshold value or the switch closing time is greater than a second preset threshold value;
and the second diagnosis module is used for obtaining and outputting the diagnosis result of the three-phase position of the displacement interval switch according to the negative sequence current and the zero sequence current.
9. Terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the computer program, realizes the steps of the method for diagnosing a switching three-phase inconsistency according to any of the claims 1 to 7.
10. A computer-readable storage medium storing a computer program, characterized in that the computer program, when executed by a processor, implements the steps of the method for diagnosing a switching three-phase inconsistency of any of claims 1 through 7.
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| CN202311601575.4A CN117706345A (en) | 2023-11-27 | 2023-11-27 | Method, device, terminal equipment and storage medium for diagnosing switch three-phase inconsistency |
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