Relay protection recording data extraction and fault analysis method and system

Abstract

The invention discloses a relay protection recording data extraction and fault analysis method and system. The method comprises the following steps: extracting recording data of relay protection devices of different models on site; performing format consistency conversion to obtain a wave recording file in a general format; identifying analog quantity channel information and switching quantity channel information, and confirming the integrity of the channel information and the consistency of file formats; performing character fuzzy matching on each channel name by adopting a traversal method, and automatically identifying loop information contained in the file; performing analog quantity channel fault judgment according to the analog quantity channel information; performing switching value channel fault judgment according to the switching value channel information; comprehensively judging the fault type; and generating and displaying a fault analysis report according to the comprehensively judged fault type. According to the method, fault data of different types of relay protection devices are acquired and automatically analyzed on site, fault reasons are quickly positioned, the fault change process is deeply analyzed, and operation and maintenance operators on duty can be helped to carry out fault judgment and fault disposal.

Description

Technical Field

[0001] The invention belongs to the technical field of relay protection, and relates to a method and system for extracting relay protection recording data and analyzing faults. Background Art

[0002] When a power system fails, it must be dealt with quickly to prevent the failure from spreading further, causing greater damage to the power grid and causing large-scale power outages. The premise for quickly dealing with the failure is to be able to collect relatively comprehensive failure information at the first time, and to be able to analyze and locate the failure information at the first time.

[0003] As an important secondary device of the power system, the relay protection device is an important device to ensure the stable operation of the power system. In addition to the function of detecting and isolating faults, it also has the function of recording the data information at the moment of the fault. It can timely discover events that endanger the safe operation of the power grid and directly trigger the circuit breaker to trip in an emergency to avoid the development and expansion of the event. It is an important basis for power system fault analysis and disposal. The relay protection device has a fault recording function. Under the condition of ensuring a high sampling rate, it records the changes in electrical parameters before and after the fault occurs, which plays a very critical role in fault analysis.

[0004] At present, the manufacturers and models of relay protection devices running in the power system vary greatly. The methods and data formats of obtaining fault recording files of various types of relay protection devices vary greatly, making it difficult for operation and maintenance personnel to obtain fault recording files in the first place. Even if the fault recording files can be obtained, the manufacturer's dedicated software tools are required to open the recording files and analyze the waveforms point by point to determine the fault problem, which results in a long fault handling time and affects the safe and stable operation of the power system. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the present invention provides a method and system for extracting relay protection recording data and analyzing faults, and proposes an open, highly compatible, on-site reading and parsing method for fault recording files of relay protection devices of different models, which can acquire and automatically analyze fault data of relay protection devices of different models on-site, quickly locate the cause of the fault, deeply analyze the cause of the fault and the changing process, help restore the dynamic process of the fault, provide technical support for fault decision-making, and assist operation and maintenance personnel on duty to perform fault identification and fault handling.

[0006] The present invention adopts the following technical solution.

[0007] The first aspect of the present invention provides a method for extracting relay protection recording data and analyzing faults, comprising:

[0008] Extract recorded data of different types of relay protection devices on site;

[0009] Perform format consistency conversion on the recording data of different types of relay protection to obtain recording files in a universal format;

[0010] Identify analog channel information and switch channel information in the universal format recording file and confirm the integrity of the channel information and the consistency of the file format;

[0011] For the confirmed recording files, the traversal method is used to perform fuzzy text matching on the names of each channel to automatically identify the circuit information contained in the file;

[0012] Perform analog channel fault determination based on analog channel information to obtain analog fault information;

[0013] Perform switch quantity channel fault determination according to switch quantity channel information to obtain switch quantity fault information;

[0014] Comprehensively determine the fault type using loop information, analog fault information, and switch fault information;

[0015] Generate and display a fault analysis report based on the comprehensive judgment of the fault type.

[0016] Preferably, the on-site extraction of recorded data of relay protection devices of different types includes: using a handheld device compatible with the communication interface of relay protection devices of different types, and using a universal communication line and a conversion connector to conveniently extract recorded data of relay protection devices of different types on-site, the communication interface including an RS232 serial port, an RS486 serial port and an Ethernet port, and providing a communication protocol library for relay protection devices of different types.

[0017] Preferably, the recording data of different types of relay protection are converted for format consistency to obtain a recording file in a universal format, including: classifying, assembling and format converting the recording data of different types of relay protection devices to generate a COMTRADE recording file with a standard format and complete data.

[0018] Preferably, the analog channel information includes channel name, channel attributes and transformation ratio, and the channel attributes include direct current, direct voltage, alternating current, alternating voltage and frequency channel attributes;

[0019] The switch channel information includes the channel name and position status.

[0020] Preferably, the loop information includes the loop name, associated information of the analog quantity channels and switch quantity channels to which it belongs.

[0021] Preferably, performing analog channel fault determination according to analog channel information to obtain analog fault information includes:

[0022] The analog channel information at different sampling rates is normalized, and then the mutation ΔIK of each channel analog quantity at time K is calculated on the sampling time axis;

[0023] When |ΔIK|>IM, the corresponding channel is judged to have a fault and the corresponding fault time point is given, where IM is the channel mutation threshold.

[0024] Preferably, the calculation formula of the mutation amount ΔIK is:

[0025] ΔIK=||IK-IK-N|-|IK-N-IK-2N||

[0026] Where IK represents the measured sampling value at time K;

[0027] IK-N represents the measured sampling value of one cycle before time K;

[0028] IK-2N represents the measured sampling value two cycles before time K.

[0029] Preferably, performing switch quantity channel fault determination according to switch quantity channel information to obtain switch quantity fault information includes: traversing the switch quantity position states within a sampling time range, and automatically identifying the position change time points and position change properties of each switch quantity channel.

[0030] Preferably, the method of comprehensively determining the fault type by using the loop information, the analog fault information, and the switch fault information includes:

[0031] By using the analog channel and switch channel information contained in each circuit, as well as the analog fault information and switch fault information, combined with time scale alignment, the fault form of the corresponding circuit under the same time scale is determined, and the fault type is comprehensively determined. The judgment criteria are as follows:

[0032] (1) Single-phase grounding: The current of a certain phase increases, the voltage decreases, and zero-sequence current and zero-sequence voltage appear; the current increases and the voltage decreases in the same phase, the zero-sequence current phase is in the same direction as the fault phase current, the zero-sequence voltage is in the opposite direction to the fault phase voltage, the fault phase voltage leads the fault phase current by 80°, and the zero-sequence current leads the zero-sequence voltage by 110°;

[0033] (2) Two-phase short circuit: The two-phase current increases, the two-phase voltage decreases, and there is no zero-sequence current or zero-sequence voltage. The current increases and the voltage decreases for the same two phases. The currents of the two fault phases are in opposite directions, and the fault phase voltage leads the fault phase current by 80°.

[0034] (3) Two-phase grounding: The two-phase current increases, the two-phase voltage decreases, and zero-sequence current and zero-sequence voltage appear. The current increases and the voltage decreases in the same two phases. The zero-sequence current phase is between the faulty two-phase currents. The faulty phase voltage leads the faulty phase current by 80°, and the zero-sequence current leads the zero-sequence voltage by 110°.

[0035] (4) Three-phase grounding: The three-phase current increases, the three-phase voltage decreases, and there is no zero-sequence current or zero-sequence voltage. The fault phase voltage leads the fault phase current by 80°, and the fault phase-to-phase voltage leads the fault phase-to-phase current by 80°.

[0036] Preferably, the fault analysis report includes a fault briefing and a detailed fault analysis report;

[0037] The fault report includes fault type, fault phase and fault time;

[0038] The fault analysis report includes the fault type, fault phase, fault time, and a detailed description of the fault action process in chronological order, the impact on other circuits and channels, and a detailed description of the fault recovery process when the recorded data is fully recorded.

[0039] The second aspect of the present invention provides a relay protection recording data extraction and fault analysis system, comprising:

[0040] The data acquisition module is used to extract the recording data of different types of relay protection devices on site; perform format consistency conversion on the recording data of different types of relay protection to obtain a recording file in a universal format;

[0041] The fault analysis module is used to identify the analog channel information and switch channel information in the general format recording file and confirm the integrity of the channel information and the consistency of the file format; for the confirmed recording file, the traversal method is used to perform fuzzy text matching on the names of each channel to automatically identify the loop information contained in the file; the analog channel fault is determined according to the analog channel information to obtain the analog fault information; the switch channel fault is determined according to the switch channel information to obtain the switch fault information; the fault type is comprehensively determined using the loop information, analog fault information, and switch fault information;

[0042] The fault display module is used to generate and display a fault analysis report based on the comprehensively determined fault type.

[0043] A third aspect of the present invention provides a terminal, including a processor and a storage medium;

[0044] The storage medium is used to store instructions; the processor is used to operate according to the instructions to execute the steps of the method.

[0045] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of the method when executed by a processor.

[0046] Compared with the prior art, the beneficial effects of the present invention include at least:

[0047] The present invention can conveniently and quickly read the fault recording data of different relay protection devices on site by using a handheld terminal. This method is universal and convenient, can be compatible with different types of relay protection devices, and can quickly obtain the fault recording data of different types of relay protection devices.

[0048] The present invention performs format consistency conversion on recording data of different types of relay protections to obtain recording files in a universal format, which is convenient for other systems to access and share, and also lays a unified format data foundation for subsequent fault analysis.

[0049] The present invention identifies analog channel information and switch channel information in a recording file of a universal format and confirms the integrity of the channel information and the consistency of the file format. It adopts a traversal method to perform fuzzy text matching on the names of each channel, automatically identifies the loop information contained in the file, and automatically parses and analyzes the fault recording data in combination with the analog fault information, the switch fault information and the basis for determining the type of fault. It can quickly locate the type of fault, quickly obtain the key nodes of the fault process and the comparison data of the electrical parameter changes before and after, and the operation and maintenance personnel on duty can make an accurate judgment on the fault without the need for traditional waveform analysis, thereby shortening the time for manual fault waveform analysis, improving the accuracy of fault analysis, and winning precious time for fault analysis and disposal.

[0050] The present invention forms a fault briefing and a detailed fault analysis report in accordance with professional practices and fault judgment results. The fault briefing is a simple description of the fault type, fault phase, and fault time, covering the basic elements of the fault. In addition to the fault elements, the fault analysis report describes the action process of the fault in detail in chronological order, as well as the impact on other circuits and channels. When the recording data is fully recorded, the fault recovery process can also be described in detail, allowing operation and maintenance personnel to accurately judge the fault occurrence process and provide decision-making assistance for subsequent fault handling.

[0051] The analog channel fault judgment method of the present invention adopts the difference of mutation values ​​of two adjacent cycles for calculation, overcomes the imbalance caused by the system frequency deviating from the rated value, normalizes the sampling rate of data at different sampling rates, avoids the calculation error caused by different sampling rates, has the characteristics of short data window and sensitive response to non-full-phase operation faults, and can effectively locate the time, mutation value and fault attribute of analog channel fault occurrence and fault recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a flowchart of the relay protection recording data extraction and fault analysis method of the present invention;

[0053] Figure 2 It is a flow chart of the relay protection recording data extraction and fault analysis method of the present invention. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only embodiments of a part of the present invention, rather than all embodiments. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention.

[0055] Embodiment 1 of the present invention provides a method for extracting relay protection recording data and analyzing faults, such as Figure 1-2 As shown, including:

[0056] Step 1: Extract the recorded data of different types of relay protection devices on site;

[0057] Further preferably, after a fault occurs, the relay protection device records the fault process and saves it in the device. The present invention uses a specially developed handheld device that is compatible with different types of relay protection device communication interfaces, including RS232 serial port, RS486 serial port and Ethernet port, provides different types of relay protection device communication protocol libraries, designs universal communication lines and conversion connectors, and designs a unified software user interface, which can quickly and easily extract different types of relay protection device recording data on site.

[0058] The handheld terminal can be used to conveniently and quickly read the fault recording data of different relay protection devices on site. This method is universal, convenient, and compatible with different models of relay protection devices.

[0059] Step 2: Perform format consistency conversion on the recording data of different types of relay protection to obtain a recording file in a universal format;

[0060] Parse the fault recording data of different relay protection devices, and organize the data to form a unified fault recording data storage format, that is, a unified format COMTRADE fault recording file, which has the basic elements and operation data for fault analysis. Specifically: classify, assemble and convert the recording data of different types of relay protection devices obtained by the handheld device to generate a COMTRADE recording file with a standard format and complete data. For different types of relay protection devices, it is necessary to adapt to the device's customized communication protocol interaction process and steps to complete the extraction of analog channel information, switch channel information, sampling rate, number of sampling points, sampling time stamp, sampling data and other information, and finally synthesize it according to the COMTRADE recording file format standard to form a recording file in a universal format, which is convenient for other systems to access and share, and also lays a unified format data foundation for subsequent fault analysis.

[0061] Then the fault recording data is automatically parsed and analyzed, which can quickly locate the fault type, quickly obtain the key nodes of the fault process and the comparison data of the electrical parameter changes before and after, and the operation and maintenance staff on duty can make accurate judgments on the fault without the need for traditional waveform analysis. The details are as follows:

[0062] Step 3: Identify the analog channel information and switch channel information in the universal format recording file and confirm the integrity of the channel information and the consistency of the file format;

[0063] Specifically: Read COMTRADE files according to format requirements, identify channel information, and confirm information integrity and file format consistency.

[0064] The analog channel information includes channel name, channel attributes (DC current, DC voltage, AC current, AC voltage, frequency, etc.), transformation ratio, etc.

[0065] The switch channel information includes the channel name, initial state (0 or 1), etc.

[0066] The analog and switch channel parameters analyzed from the recorded data can be used for sudden change analysis, over-limit analysis, and switch position change analysis.

[0067] Step 4: For the recording file confirmed in step 3, use the traversal method to perform fuzzy text matching on each channel name to automatically identify the circuit information contained in the file;

[0068] Specifically: Different from other methods that manually configure loop information and associated channel information, the method of the present invention uses a traversal method to perform fuzzy text matching on each channel name in the absence of any configuration information and when the loop information of the COMTRADE file is incomplete. At the same time, combined with the naming habits of power system channels, reserved keywords, etc., it can automatically identify the loop information contained in the recording file and form a loop list. The list information includes the loop name, the associated information of the analog channels and the switch channels to which it belongs.

[0069] The loop channel group identified from the recorded data can be used for fault type analysis and fault process analysis.

[0070] Step 5: Perform analog channel fault determination based on analog channel information to obtain analog fault information;

[0071] Specifically: The analog channel fault determination method of the present invention has the characteristics of short data window and sensitive response to non-full-phase operation faults, and can effectively locate the time, mutation value and fault attribute (increase or decrease) of the occurrence and recovery of the AC analog channel fault. The analog channel fault determination method of the present invention uses the difference of the mutation value of two adjacent cycles for calculation to overcome the imbalance caused by the deviation of the system frequency from the rated value. Taking the AC current channel as an example, that is:

[0072] ΔI K =||I K -I K-N |-|I K-N -I K-2N ||

[0073] Among them, ΔI K represents the calculated value of the fault component at time K;

[0074] I K Represents the measured sampling value at time K;

[0075] I K-N Indicates the measurement sampling value of the cycle before time K;

[0076] I K-2N Represents the measured sampling value two cycles before time K.

[0077] In the above calculation process, the data at different sampling rates need to be normalized to avoid calculation errors caused by different sampling rates.

[0078] In the case where no additional configuration is required, the method of the present invention automatically sets the channel mutation threshold IM according to the analog channel attributes and waveform data acquired in step 3.

[0079] First, calculate the effective value of the channel analog quantity before the fault and compare it with the conventional transformation ratio of the secondary value of the relay protection. For example, if the rated voltage of the AC current is 5A or 1A and the rated voltage of the AC is 100V, if it exceeds the typical empirical value, it is replaced by the maximum effective value. On the basis of determining the rated effective value, set the channel threshold at a ratio of 1.5. Reduce human intervention and avoid cumbersome parameter configuration process during use.

[0080] The calculation is performed on the sampling time axis. When |ΔIK|>IM, it is determined that there is a fault in the channel of this phase and the time point of the fault is given.

[0081] Fault recovery The fault point and fault attributes of fault recovery can be calculated in the same way.

[0082] Step 6: Perform switch channel fault determination based on switch channel information to obtain switch fault information;

[0083] Specifically: The fault judgment of the switch channel is relatively simple. Within the sampling time range, the switch position state (0 or 1) is traversed, and the change time point and change attribute (0 to 1, or 1 to 0) of each switch channel are automatically identified.

[0084] Step 7: Comprehensively determine the fault type using the loop information, analog fault information, and switch fault information;

[0085] Specifically: using the intelligent determination of the analog channel and switch channel information contained in each circuit (step 4) and the fault information determined by these channels (steps 5 and 6), using time scale alignment, to determine the fault form of the circuit under the same time scale, and comprehensively determine the fault type. The determination basis includes:

[0086] (1) Single-phase grounding: The current in a certain phase increases and the voltage decreases; zero-sequence current and zero-sequence voltage appear; the current increases and the voltage decreases in the same phase; the zero-sequence current phase is in the same direction as the fault phase current, and the zero-sequence voltage is in the opposite direction to the fault phase voltage; the fault phase voltage leads the fault phase current by about 80° (i.e., the line impedance angle), and the zero-sequence current leads the zero-sequence voltage by about 110°.

[0087] (2) Two-phase short circuit: The current of the two phases increases and the voltage of the two phases decreases; there is no zero-sequence current or zero-sequence voltage; the current increases and the voltage decreases for the same two phases; the currents of the two fault phases are basically in opposite directions; the voltage between the fault phases leads the current between the fault phases by about 80°.

[0088] (3) Two-phase grounding: The two-phase current increases and the two-phase voltage decreases; zero-sequence current and zero-sequence voltage appear; the current increases and the voltage decreases in the same two phases; the zero-sequence current phase is between the two fault currents; the fault phase voltage leads the fault phase current by about 80°; the zero-sequence current leads the zero-sequence voltage by about 110°.

[0089] (4) Three-phase grounding: The three-phase current increases and the three-phase voltage decreases; there is no zero-sequence current or zero-sequence voltage; the fault phase voltage leads the fault phase current by about 80°; the fault phase-to-phase voltage leads the fault phase-to-phase current by about 80°.

[0090] Step 8: Generate a fault analysis report based on the comprehensively determined fault type to show the entire process of changes before and after the fault.

[0091] Specifically: According to professional practices and fault judgment results, a fault briefing and a detailed fault analysis report are formed. The fault briefing is a simple description of the fault type, fault phase, and fault time, covering the basic elements of the fault. In addition to the fault elements, the fault analysis report describes the action process of the fault in detail in chronological order, as well as the impact on other circuits and channels. In the case of complete recording of the recorded data, the fault recovery process can also be described in detail. The new fault report including the fault time point, fault type, fault characteristic data, etc. is obtained in text form at the first time, which enables the operation and maintenance personnel to accurately judge the fault occurrence process and provide decision-making assistance for subsequent fault handling.

[0092] Embodiment 2 of the present invention provides a method for extracting relay protection recording data and analyzing faults, including:

[0093] The data acquisition module is used to extract the recording data of different types of relay protection devices on site; perform format consistency conversion on the recording data of different types of relay protection to obtain a recording file in a universal format;

[0094] The fault analysis module is used to identify the analog channel information and switch channel information in the general format recording file and confirm the integrity of the channel information and the consistency of the file format; for the confirmed recording file, the traversal method is used to perform fuzzy text matching on the names of each channel to automatically identify the loop information contained in the file; the analog channel fault is determined according to the analog channel information to obtain the analog fault information; the switch channel fault is determined according to the switch channel information to obtain the switch fault information; the fault type is comprehensively determined using the loop information, analog fault information, and switch fault information;

[0095] The fault display module is used to generate and display a fault analysis report based on the comprehensively determined fault type.

[0096] Embodiment 3 of the present invention provides a terminal, including a processor and a storage medium; the storage medium is used to store instructions;

[0097] The processor is configured to operate according to the instructions to execute the steps of the method.

[0098] Embodiment 4 of the present invention provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of the method when executed by a processor.

[0099] Compared with the prior art, the beneficial effects of the present invention include at least:

[0100] The present invention can conveniently and quickly read the fault recording data of different relay protection devices on site by using a handheld terminal. This method is universal and convenient, can be compatible with different types of relay protection devices, and can quickly obtain the fault recording data of different types of relay protection devices.

[0101] The present invention performs format consistency conversion on recording data of different types of relay protections to obtain recording files in a universal format, which is convenient for other systems to access and share, and also lays a unified format data foundation for subsequent fault analysis.

[0102] The present invention identifies analog channel information and switch channel information in a recording file of a universal format and confirms the integrity of the channel information and the consistency of the file format. It adopts a traversal method to perform fuzzy text matching on the names of each channel, automatically identifies the loop information contained in the file, and automatically parses and analyzes the fault recording data in combination with the analog fault information, the switch fault information and the basis for determining the type of fault. It can quickly locate the type of fault, quickly obtain the key nodes of the fault process and the comparison data of the electrical parameter changes before and after, and the operation and maintenance personnel on duty can make an accurate judgment on the fault without the need for traditional waveform analysis, thereby shortening the time for manual fault waveform analysis, improving the accuracy of fault analysis, and winning precious time for fault analysis and disposal.

[0103] The present invention forms a fault briefing and a detailed fault analysis report in accordance with professional practices and fault judgment results. The fault briefing is a simple description of the fault type, fault phase, and fault time, covering the basic elements of the fault. In addition to the fault elements, the fault analysis report describes the action process of the fault in detail in chronological order, as well as the impact on other circuits and channels. When the recording data is fully recorded, the fault recovery process can also be described in detail, allowing operation and maintenance personnel to accurately judge the fault occurrence process and provide decision-making assistance for subsequent fault handling.

[0104] The analog channel fault judgment method of the present invention adopts the difference of mutation values ​​of two adjacent cycles for calculation, overcomes the imbalance caused by the system frequency deviating from the rated value, normalizes the sampling rate of data at different sampling rates, avoids the calculation error caused by different sampling rates, has the characteristics of short data window and sensitive response to non-full-phase operation faults, and can effectively locate the time, mutation value and fault attribute of analog channel fault occurrence and fault recovery.

[0105] The present disclosure may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0106] A computer-readable storage medium may be a tangible device that can hold and store instructions used by an instruction execution device. A computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples of computer-readable storage media (a non-exhaustive list) include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination of the foregoing. As used herein, a computer-readable storage medium is not to be interpreted as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through a wire.

[0107] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in the computer-readable storage medium in each computing / processing device.

[0108] The computer program instructions for performing the operation of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages, such as Smalltalk, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. Computer-readable program instructions may be executed completely on a user's computer, partially on a user's computer, as an independent software package, partially on a user's computer, partially on a remote computer, or completely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider to connect via the Internet). In some embodiments, an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), may be customized by utilizing the state information of the computer-readable program instructions, and the electronic circuit may execute the computer-readable program instructions, thereby realizing various aspects of the present disclosure.

[0109] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for extracting relay protection recording data and analyzing faults, characterized in that: include: Extract recorded data of different types of relay protection devices on site; Perform format consistency conversion on the recording data of different types of relay protection to obtain recording files in a universal format; Identify analog channel information and switch channel information in the universal format recording file and confirm the integrity of the channel information and the consistency of the file format; For the confirmed recording files, the traversal method is used to perform fuzzy text matching on the names of each channel to automatically identify the circuit information contained in the file; Perform analog channel fault determination based on analog channel information to obtain analog fault information; Perform switch quantity channel fault determination according to switch quantity channel information to obtain switch quantity fault information; Comprehensively determine the fault type using loop information, analog fault information, and switch fault information; Generate and display a fault analysis report based on the comprehensive judgment of the fault type.

2. The method for extracting relay protection recording data and analyzing faults according to claim 1, characterized in that: The on-site extraction of recorded wave data of relay protection devices of different models includes: using a handheld device compatible with communication interfaces of relay protection devices of different models, and using a universal communication line and a conversion connector to conveniently extract recorded wave data of relay protection devices of different models on-site, wherein the communication interface includes an RS232 serial port, an RS486 serial port and an Ethernet port, and provides a communication protocol library of relay protection devices of different models.

3. The method for extracting relay protection recording data and analyzing faults according to claim 1, characterized in that: The recording data of different types of relay protection are converted into a format consistency to obtain a recording file in a universal format, including: classifying, assembling and format conversion of the recording data of different types of relay protection devices to generate a COMTRADE recording file with a standard format and complete data.

4. The method for extracting relay protection recording data and analyzing faults according to claim 1, characterized in that: The analog channel information includes channel name, channel attributes and transformation ratio, and the channel attributes include direct current, direct voltage, alternating current, alternating voltage and frequency channel attributes; The switch channel information includes the channel name and position status.

5. The method for extracting relay protection recording data and analyzing faults according to claim 1, characterized in that: The loop information includes the loop name, the associated information of each analog channel and the switch channel to which it belongs.

6. The method for extracting relay protection recording data and analyzing faults according to claim 1, characterized in that: The step of performing analog channel fault determination according to analog channel information to obtain analog fault information includes: The analog channel information at different sampling rates is normalized, and then the mutation ΔIK of each channel analog quantity at time K is calculated on the sampling time axis; When |ΔIK|>IM, the corresponding channel is judged to have a fault and the corresponding fault time point is given, where IM is the channel mutation threshold.

7. The method for extracting relay protection recording data and analyzing faults according to claim 6, characterized in that: The calculation formula of the mutation amount ΔIK is: ΔIK=||IK-IK-N|-|IK-N-IK-2N|| Where IK represents the measured sampling value at time K; IK-N represents the measured sampling value of one cycle before time K; IK-2N represents the measured sampling value two cycles before time K.

8. The method for extracting relay protection recording data and analyzing faults according to claim 1, characterized in that: The switching quantity channel fault determination is performed according to the switching quantity channel information to obtain the switching quantity fault information, including: traversing the switching quantity position state within the sampling time range, and automatically identifying the position change time point and position change attribute of each switching quantity channel.

9. The method for extracting relay protection recording data and analyzing faults according to claim 1, characterized in that: The method of comprehensively determining the fault type by using the loop information, analog fault information, and switch fault information includes: By using the analog channel and switch channel information contained in each circuit, as well as the analog fault information and switch fault information, combined with time scale alignment, the fault form of the corresponding circuit under the same time scale is determined, and the fault type is comprehensively determined. The judgment criteria are as follows: (1) Single-phase grounding: The current of a certain phase increases, the voltage decreases, and zero-sequence current and zero-sequence voltage appear; the current increases and the voltage decreases in the same phase, the zero-sequence current phase is in the same direction as the fault phase current, the zero-sequence voltage is in the opposite direction to the fault phase voltage, the fault phase voltage leads the fault phase current by 80°, and the zero-sequence current leads the zero-sequence voltage by 110°; (2) Two-phase short circuit: The two-phase current increases, the two-phase voltage decreases, and there is no zero-sequence current or zero-sequence voltage. The current increases and the voltage decreases for the same two phases. The currents of the two fault phases are in opposite directions, and the fault phase voltage leads the fault phase current by 80°. (3) Two-phase grounding: The two-phase current increases, the two-phase voltage decreases, and zero-sequence current and zero-sequence voltage appear. The current increases and the voltage decreases in the same two phases. The zero-sequence current phase is between the faulty two-phase currents. The faulty phase voltage leads the faulty phase current by 80°, and the zero-sequence current leads the zero-sequence voltage by 110°. (4) Three-phase grounding: The three-phase current increases, the three-phase voltage decreases, and there is no zero-sequence current or zero-sequence voltage. The fault phase voltage leads the fault phase current by 80°, and the fault phase-to-phase voltage leads the fault phase-to-phase current by 80°.

10. The method for extracting relay protection recording data and analyzing faults according to claim 1, characterized in that: The fault analysis report includes a fault briefing and a detailed fault analysis report; The fault report includes fault type, fault phase and fault time; The fault analysis report includes the fault type, fault phase, fault time, and a detailed description of the fault action process in chronological order, the impact on other circuits and channels, and a detailed description of the fault recovery process when the recorded data is fully recorded.

11. A relay protection recording data extraction and fault analysis system, using the method according to any one of claims 1 to 10, characterized in that: include: The data acquisition module is used to extract the recording data of different types of relay protection devices on site; perform format consistency conversion on the recording data of different types of relay protection to obtain a recording file in a universal format; The fault analysis module is used to identify the analog channel information and switch channel information in the general format of the recording file and confirm the integrity of the channel information and the consistency of the file format; for the confirmed recording file, the traversal method is used to perform fuzzy text matching on the names of each channel to automatically identify the loop information contained in the file; the analog channel fault is determined according to the analog channel information to obtain the analog fault information; the switch channel fault is determined according to the switch channel information to obtain the switch fault information; the fault type is comprehensively determined using the loop information, analog fault information, and switch fault information; The fault display module is used to generate and display a fault analysis report based on the comprehensively determined fault type.

12. A terminal comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is configured to operate according to the instructions to execute the steps of the method according to any one of claims 1-10.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 10 are implemented.

Images