Power distribution terminal single-phase earth fault recording automatic interrogation method and system

Abstract

The invention provides a power distribution terminal single-phase earth fault recording automatic interrogation method and system, and the method comprises the following steps: S1, a recording automatic interrogation function is triggered, and a trigger signal comes from a grounding pop-up window signal of a power distribution main station or a continuous alarm signal of a power distribution terminal outside the station; s2, confirming a recording interrogation time window; s3, confirming the power distribution terminal needing the call, and when confirming the power distribution terminal needing the call, flexibly adjusting the call range by the system according to the current communication pressure condition; s4, required recorded waves are measured through interrogation; s5, abnormal recorded wave filtering: aiming at a recorded wave data packet loss phenomenon possibly caused by instability in a communication process, automatically screening and eliminating the recorded wave data containing the packet loss phenomenon by a system through an intelligent identification mechanism; the method can be integrated in a power distribution master station system, automatic, efficient and accurate wave recording interrogation of the single-phase earth fault of the power distribution terminal is achieved, and solid technical support is provided for safe operation and fault analysis of a power system.

Description

Technical Field

[0001] The present invention relates to the technical field of power distribution automation, and in particular to a method and system for automatically calling for detection of single-phase ground fault wave recording at a power distribution terminal. Background Art

[0002] As the most frequent fault type in the distribution network and the one that is extremely complex to identify and locate, the efficient and accurate identification and location of single-phase grounding faults have become a key challenge to improving the technical level of distribution network equipment. To this end, it is urgent to build a large single-phase grounding fault recording case library to drive technological innovation and optimization. However, a major problem currently faced is that the process of collecting these cases is very difficult due to the limitations of the communication protocol between the distribution terminal and the distribution master station.

[0003] Specifically, the traditional manual operation mode requires technicians to initiate a recording call request to the distribution terminal through the distribution master station. This process often takes more than ten minutes, is inefficient, and is difficult to adapt to the needs of large-scale data collection. What is even more difficult is that there are many recording files in the distribution terminal. If the operator is inexperienced or has limited judgment, it is easy to get lost in the massive data, resulting in the recording being called for not being the target single-phase grounding fault recording, which seriously reduces the practical value of the recording data. Therefore, exploring and practicing more efficient and intelligent recording case collection methods has become a top priority to break through the current predicament and promote the advancement of distribution network fault analysis and location technology. Summary of the invention

[0004] The present invention proposes a method and system for automatic recording and detection of single-phase grounding faults at distribution terminals, which can be integrated into a distribution master station system to achieve automatic, efficient and accurate recording and detection of single-phase grounding faults at distribution terminals, providing solid technical support for safe operation and fault analysis of power systems.

[0005] The present invention adopts the following technical solutions.

[0006] A method for automatically calling for single-phase ground fault recording at a power distribution terminal comprises the following steps: Step S1: The automatic recording test function is triggered, and the trigger signal comes from the grounding pop-up window signal of the power distribution master station or the continuous alarm signal of the power distribution terminal outside the station; Step S2: confirm the recording and testing time window, and intelligently set the recording and testing time window according to the specific time of the pop-up window or alarm signal; Step S3: confirm the distribution terminal that needs to be called. When confirming the distribution terminal that needs to be called, the system flexibly adjusts the calling range according to the current communication pressure status; Step S4: When the recording required for the test is frequently started at some distribution terminals, it is ensured that the time interval between two recordings exceeds the preset time interval threshold, and the recordings called for test from the same distribution terminal should have an upper limit, so as to improve the quality and effectiveness of the recording; Step S5: Abnormal recording filtering. In order to solve the problem of recording data packet loss caused by instability in the communication process, the system uses an intelligent recognition mechanism to automatically screen and remove recording data containing packet loss.

[0007] The single-phase ground fault recording and automatic call-up system for distribution terminals adopts the single-phase ground fault recording and automatic call-up method for distribution terminals. The system is integrated in the distribution master station system. When executing step S2, the system intelligently sets the time window for recording and calling after receiving the trigger signal; the setting process includes determining the time window reference value and determining the time window length.

[0008] The method used by the system to determine the time window reference value is as follows: comprehensively considering the delay characteristics of signal transmission, when the distribution terminal alarm signal is available, the system prioritizes its time as the time window reference value to reduce the error caused by the main station processing delay. This strategy ensures that the starting point of the time window is as close as possible to the actual time when the fault occurs.

[0009] The method used by the system to determine the length of the time window is as follows: assuming that there is a delay regardless of which signal is used as the reference value, and that there is a significant difference in the recording behavior of the distribution terminal before and after the single-phase grounding fault, the system automatically adjusts the length of the time window and expands it forward to cover the critical period before the fault.

[0010] When determining the length of the time window, the system takes the starting point of the time window as 2 minutes forward of the benchmark value and the end point as 20 seconds backward of the benchmark value to ensure data integrity and capture of key information.

[0011] When the system executes step S3, if there is no communication pressure, it will comprehensively call for the recorded data of all terminals under the same bus line to ensure the comprehensiveness and detailedness of the data; if there is communication congestion, the call range will be intelligently adjusted; when there is communication pressure, the system will intelligently narrow the call range to the distribution terminals on the key nodes of the distribution line main line and the head end of the large branch, so as to ensure the smooth transmission of important data and the stable operation of the distribution system.

[0012] A scenario where communication pressure exists is when faults frequently occur in the same area under severe weather conditions, causing a large number of distribution terminals to need to communicate with the master station.

[0013] When the system executes step S4, if some distribution terminals trigger multiple recordings when a fault occurs due to a low recording start threshold or too many start conditions, the system determines that the recording of some distribution terminals is frequently started; When the system executes step S4, the time interval threshold refers to the time threshold set by the system according to the field data analysis experience to distinguish different recording events; when the time interval between the latter recording and the former recording is too small, they are regarded as the same fault, and the system only calls for the former recording, thereby effectively avoiding the calling of useless recordings and improving data processing efficiency; When the system executes step S4, the upper limit refers to setting an upper limit on the number of recording calls for a single distribution terminal when responding to a recording call signal to prevent too many recordings triggered by the same fault from occupying too many communication resources and reducing system pressure.

[0014] When the system executes step S4, the upper limit of the number of recording calls is set to 6.

[0015] When the system executes step S5 with the built-in intelligent recognition mechanism, the intelligent recognition mechanism refers to judging whether the data is complete and reliable by checking the integrity of the recording configuration file information and the size of the data file, thereby ensuring the accuracy and reliability of the analyzed data.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1) Timeliness of recording and calling for measurement: Traditional manual collection methods often have slow response speeds, resulting in the problem of recording data being overwritten by new data at some distribution terminals. The present invention introduces an automatic trigger mechanism, which can immediately respond and automatically trigger the recording data call for measurement of the distribution terminal after a single-phase grounding fault occurs. This immediacy not only effectively avoids the problem of untimely manual operation, but also ensures the integrity and timeliness of the fault data, providing strong support for subsequent fault analysis.

[0017] 2) High efficiency of wave recording and testing: The traditional manual testing method requires technicians to operate one by one, which is not only time-consuming but also inefficient. This inefficiency is particularly prominent when multiple distribution terminals need to call for wave recording data at the same time. Through system integration and automated process design, the present invention realizes that the system automatically initiates the wave recording and testing command, and can call for wave recording data of several distribution terminals at the same time. It is estimated that this automated method can save a lot of manpower time and waiting time when calling for wave recording data of multiple distribution terminals compared to the traditional manual method.

[0018] 3) Accuracy of recording call test: The quality of recording data directly affects the accuracy and reliability of fault analysis. The traditional manual call test method often relies on the experience and judgment of technicians, which is prone to misjudgment or missed judgment. The present invention combines historical analysis experience and intelligent algorithms to design an advanced recording screening mechanism for the automatic recording call test system. This mechanism can quickly and accurately identify single-phase grounding fault recordings from massive and complex recording data, effectively avoiding invalid call tests caused by insufficient experience or misoperation of technicians, and effectively improving the quality and value of the collected recording data. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: Attached Figure 1 It is a schematic diagram of the overall logic block of the present invention; Attached Figure 2 It is a schematic diagram of the algorithm flow of the present invention. DETAILED DESCRIPTION

[0020] As shown in the figure, a method for automatically calling for single-phase ground fault recording at a distribution terminal includes the following steps: Step S1: The automatic recording test function is triggered, and the trigger signal comes from the grounding pop-up window signal of the power distribution master station or the continuous alarm signal of the power distribution terminal outside the station; Step S2: confirm the recording and testing time window, and intelligently set the recording and testing time window according to the specific time of the pop-up window or alarm signal; Step S3: confirm the distribution terminal that needs to be called. When confirming the distribution terminal that needs to be called, the system flexibly adjusts the calling range according to the current communication pressure status; Step S4: When the recording required for the test is frequently started at some distribution terminals, it is ensured that the time interval between two recordings exceeds the preset time interval threshold, and the recordings called for test from the same distribution terminal should have an upper limit, so as to improve the quality and effectiveness of the recording; Step S5: Abnormal recording filtering. In order to solve the problem of recording data packet loss caused by instability in the communication process, the system uses an intelligent recognition mechanism to automatically screen and remove recording data containing packet loss.

[0021] The single-phase ground fault recording and automatic call-up system for distribution terminals adopts the single-phase ground fault recording and automatic call-up method for distribution terminals. The system is integrated in the distribution master station system. When executing step S2, the system intelligently sets the time window for recording and calling after receiving the trigger signal; the setting process includes determining the time window reference value and determining the time window length.

[0022] The method used by the system to determine the time window reference value is as follows: comprehensively considering the delay characteristics of signal transmission, when the distribution terminal alarm signal is available, the system prioritizes its time as the time window reference value to reduce the error caused by the main station processing delay. This strategy ensures that the starting point of the time window is as close as possible to the actual time when the fault occurs.

[0023] The method used by the system to determine the length of the time window is as follows: assuming that there is a delay regardless of which signal is used as the reference value, and that there is a significant difference in the recording behavior of the distribution terminal before and after the single-phase grounding fault, the system automatically adjusts the length of the time window and expands it forward to cover the critical period before the fault.

[0024] When determining the length of the time window, the system takes the starting point of the time window as 2 minutes forward of the benchmark value and the end point as 20 seconds backward of the benchmark value to ensure data integrity and capture of key information.

[0025] When the system executes step S3, if there is no communication pressure, it will comprehensively call for the recorded data of all terminals under the same bus line to ensure the comprehensiveness and detailedness of the data; if there is communication congestion, the call range will be intelligently adjusted; when there is communication pressure, the system will intelligently narrow the call range to the distribution terminals on the key nodes of the distribution line main line and the head end of the large branch, so as to ensure the smooth transmission of important data and the stable operation of the distribution system.

[0026] A scenario where communication pressure exists is when faults frequently occur in the same area under severe weather conditions, causing a large number of distribution terminals to need to communicate with the master station.

[0027] When the system executes step S4, if some distribution terminals trigger multiple recordings when a fault occurs due to a low recording start threshold or too many start conditions, the system determines that the recording of some distribution terminals is frequently started; When the system executes step S4, the time interval threshold refers to the time threshold set by the system according to the field data analysis experience to distinguish different recording events; when the time interval between the latter recording and the former recording is too small, they are regarded as the same fault, and the system only calls for the former recording, thereby effectively avoiding the calling of useless recordings and improving data processing efficiency; When the system executes step S4, the upper limit refers to setting an upper limit on the number of recording calls for a single distribution terminal when responding to a recording call signal to prevent too many recordings triggered by the same fault from occupying too many communication resources and reducing system pressure.

[0028] When the system executes step S4, the upper limit of the number of recording calls is set to 6.

[0029] When the system executes step S5 with the built-in intelligent recognition mechanism, the intelligent recognition mechanism refers to judging whether the data is complete and reliable by checking the integrity of the recording configuration file information and the size of the data file, thereby ensuring the accuracy and reliability of the analyzed data.

Claims

1. A method for automatically calling for single-phase ground fault recording at a power distribution terminal, characterized in that: The following steps are involved: Step S1: The automatic recording test function is triggered, and the trigger signal comes from the grounding pop-up window signal of the power distribution master station or the continuous alarm signal of the power distribution terminal outside the station; Step S2: confirm the recording and testing time window, and intelligently set the recording and testing time window according to the specific time of the pop-up window or alarm signal; Step S3: confirm the distribution terminal that needs to be called. When confirming the distribution terminal that needs to be called, the system flexibly adjusts the calling range according to the current communication pressure status; Step S4: When the recording required for the test is frequently started at some distribution terminals, it is ensured that the time interval between two recordings exceeds the preset time interval threshold, and the recordings called for test from the same distribution terminal should have an upper limit, so as to improve the quality and effectiveness of the recording; Step S5: Abnormal recording filtering. In order to solve the problem of recording data packet loss caused by instability in the communication process, the system uses an intelligent recognition mechanism to automatically screen and remove recording data containing packet loss.

2. The distribution terminal single-phase grounding fault recording automatic call detection system adopts the distribution terminal single-phase grounding fault recording automatic call detection method, which is characterized by: The system is integrated into the power distribution master station system. When executing step S2, after receiving the trigger signal, the system intelligently sets the time window for recording and calling for measurement; the setting process includes determining the time window reference value and determining the time window length.

3. The single-phase ground fault recording and automatic call detection system for distribution terminals according to claim 2 is characterized in that: The method used by the system to determine the time window reference value is as follows: comprehensively considering the delay characteristics of signal transmission, when the distribution terminal alarm signal is available, the system prioritizes its time as the time window reference value to reduce the error caused by the main station processing delay. This strategy ensures that the starting point of the time window is as close as possible to the actual time when the fault occurs.

4. The single-phase ground fault recording and automatic call detection system for distribution terminals according to claim 2 is characterized in that: The method used by the system to determine the length of the time window is as follows: assuming that there is a delay regardless of which signal is used as the reference value, and that there is a significant difference in the recording behavior of the distribution terminal before and after the single-phase grounding fault, the system automatically adjusts the length of the time window and expands it forward to cover the critical period before the fault.

5. The single-phase ground fault recording and automatic call detection system for distribution terminals according to claim 4 is characterized in that: When determining the length of the time window, the system takes the starting point of the time window as 2 minutes forward of the benchmark value and the end point as 20 seconds backward of the benchmark value to ensure data integrity and capture of key information.

6. The single-phase ground fault recording and automatic call detection system for distribution terminals according to claim 2 is characterized in that: When the system executes step S3, if there is no communication pressure, it will comprehensively call for the recorded data of all terminals under the same bus line to ensure the comprehensiveness and detailedness of the data; if there is communication congestion, the call range will be intelligently adjusted; when there is communication pressure, the system will intelligently narrow the call range to the distribution terminals on the key nodes of the distribution line main line and the head end of the large branch, so as to ensure the smooth transmission of important data and the stable operation of the distribution system.

7. The single-phase ground fault recording and automatic call detection system for distribution terminals according to claim 6 is characterized in that: A scenario where communication pressure exists is when faults frequently occur in the same area under severe weather conditions, causing a large number of distribution terminals to need to communicate with the master station.

8. The single-phase ground fault recording and automatic call detection system for distribution terminals according to claim 2 is characterized in that: When the system executes step S4, if some distribution terminals trigger multiple recordings when a fault occurs due to a low recording start threshold or too many start conditions, the system determines that the recording of some distribution terminals is frequently started; When the system executes step S4, the time interval threshold refers to the time threshold set by the system according to the field data analysis experience to distinguish different recording events; when the time interval between the latter recording and the former recording is too small, they are regarded as the same fault, and the system only calls for the former recording, thereby effectively avoiding the calling of useless recordings and improving data processing efficiency; When the system executes step S4, the upper limit refers to setting an upper limit on the number of recording calls for a single distribution terminal when responding to a recording call signal to prevent too many recordings triggered by the same fault from occupying too many communication resources and reducing system pressure.

9. The single-phase ground fault recording and automatic call detection system for distribution terminals according to claim 8, characterized in that: When the system executes step S4, the upper limit of the number of recording calls is set to 6.

10. The single-phase ground fault recording and automatic call detection system for distribution terminals according to claim 2, characterized in that: When the system executes step S5 with the built-in intelligent recognition mechanism, the intelligent recognition mechanism refers to judging whether the data is complete and reliable by checking the integrity of the recording configuration file information and the size of the data file, thereby ensuring the accuracy and reliability of the analyzed data.

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