Power grid grounding monitoring management pulse selection background system
By using the power grid grounding monitoring and management pulse selection backend system, combined with pulse selection signal processing and dual-pulse signal transceiver modules, the problem of line selection accuracy of low-current line selection devices under complex working conditions is solved, achieving high accuracy and stable fault location, and adapting to the identification of multiple cable lines.
Patent Information
- Application Number
- CN202511587404.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-03
- Publication Date
- 2026-02-27
AI Technical Summary
Existing low-current fault location devices have low accuracy in fault location under complex conditions such as high-resistance grounding and intermittent arcing grounding, and are prone to misjudgment or rejection. They also have poor adaptability to complex grounding types, are easily affected by system operation mode and transformer accuracy, and are difficult to identify cable line faults.
The power grid grounding monitoring and management pulse selection backend system is adopted. Through the electrical line architecture module, the power grid parameters are monitored in real time. Combined with the pulse selection signal processing algorithm and the dual pulse signal transceiver module, the electrical parameters are analyzed in real time. Vacuum switches and neutral point special protectors are used to handle faults, and line selection is performed by combining multi-dimensional signal criteria.
It achieves high-accuracy line selection under complex working conditions such as high-resistance grounding and intermittent arcing grounding, improves system stability and fault location accuracy, reduces dependence on the accuracy of zero-sequence current transformers, and adapts to fault identification in multiple cable lines.
Smart Images
Figure CN121578032A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of single-phase grounding fault line selection of power grid, in particular to a power grid grounding monitoring and management pulse selection background system. BACKGROUND
[0002] Most of the medium voltage power grids in China are small current grounding systems (i.e. neutral point non-effective grounding system), when a single-phase grounding fault occurs, the regulations allow the fault to run for 2 hours, but due to the overvoltage hazard to insulation, accidents may still occur. The fault statistics of power supply and distribution system show that the probability of single-phase grounding fault is more than 70%, therefore, it is of great significance to the safe operation of power supply and distribution system to quickly determine the grounding position when single-phase grounding occurs.
[0003] The small current grounding line selection device analyzes the power grid grounding fault by collecting and judging the secondary electrical values of the voltage transformer and the current transformer, and takes corresponding alarm action. The core disadvantage of the small current line selection device is that in complex working conditions such as high resistance grounding and intermittent arc grounding, the line selection accuracy is low, and misjudgment or rejection may occur. 1. Greatly affected by grounding resistance: when the grounding resistance of the ground network is high (such as dry soil and aging grounding network), the fault current signal is weak, and the device is difficult to accurately capture and identify; 2. Poor adaptability to complex grounding types: facing intermittent arc grounding, resonance grounding and other non-steady state faults, the traditional line selection algorithm (such as zero sequence current amplitude comparison and phase comparison method) is easy to fail, resulting in line selection failure; 3. Easily disturbed by system operation mode: system load change, line switching, transformer parallel operation / parallel operation, etc. will change the zero sequence current distribution, which may cause misjudgment of the device; 4. Dependent on the accuracy of the mutual inductor: if the accuracy of the zero sequence current transformer (CT) is insufficient, there is saturation or installation process problem, which will directly affect the accuracy of the collected signal, and further reduce the line selection reliability; 5. Difficulty in identifying cable lines: the distributed capacitance current of cable lines is large, which may mask the real fault current signal, especially in the distribution network with multiple cable lines, the line selection difficulty is significantly increased.
[0004] Therefore, we propose a power grid grounding monitoring and management pulse selection background system to solve the above problems. SUMMARY
[0005] In order to solve the technical problem that the core disadvantage of the existing small current line selection device is that in complex working conditions such as high resistance grounding and intermittent arc grounding, the line selection accuracy is low, and misjudgment or rejection may occur, the present application provides a power grid grounding monitoring and management pulse selection background system.
[0006] The application adopts the following technical scheme: a power grid grounding monitoring and management pulse selection background system, comprising an electrical line architecture module and a function module, the electrical line architecture module comprises a total bus and a branch bus, the branch bus is a branch line after the total bus electrical energy distribution, the electrical line architecture module can perceive the grounding situation of the whole power grid through real-time monitoring of the total bus electrical parameters, the electrical line architecture module can locate the grounding fault partition, the electrical line architecture module uses a pulse selection signal processing algorithm to real-time monitor the electrical parameters of each point of the power grid, the background system performs real-time analysis on the electrical parameters, when the parameters exceed the normal range or abnormal changes occur, the corresponding event record and early warning are automatically triggered, and the function module comprises a traction diagram module, an event window module, a statistical report module, a reset module and an information detail table module.
[0007] Preferably, the pulse selection signal processing algorithm collects the current signal of the current transformer, sends the amplified current signal in the dynamic monitoring controller to the dynamic monitoring controller for comparative analysis, simultaneously, a dynamic capture monitor captures three-phase voltage, real-time monitors the voltage dynamic change amount and the system phase change amount, transmits to the dynamic monitoring controller for analysis, adopts a double-pulse signal transceiver module, locks the collected and captured phase and current signal, and then makes comparison criterion, and makes criterion for comprehensive signal to select lines.
[0008] Preferably, after the electrical line architecture module monitors the grounding fault, a full-voltage controller acts, if it is an arc grounding fault, a vacuum switch is put into operation to eliminate the arc, and a wide-frequency voltage absorber is used to absorb the sharp peak voltage; if it is an overvoltage and resonance fault, a neutral point special protector is put into operation to eliminate the primary and secondary resonance Preferably, the traction diagram module comprises graphic display and real-time state display, and the traction diagram module can be interactively operated.
[0009] Preferably, the event window module real-time captures all events related to grounding in the power grid operation process, classifies the captured events according to the severity, sorts and displays them according to the time sequence, and can view the detailed information of the events.
[0010] Preferably, the statistical report module collects data for integration and preprocessing, automatically generates various statistical reports, and exports the reports into common formats.
[0011] Preferably, the reset module comprises manual reset operation, automatic reset operation and record of the reset operation.
[0012] Preferably, the information detail table module can store the complete process data information of the grounding event, and query, export and print the information data.
[0013] Preferably, after a grounding event occurs, the traction graph module displays the abnormal location, the event window module records the details synchronously, and the statistical report module automatically updates the relevant data.
[0014] Compared with the prior art, the beneficial effects of the present invention are: This invention uses a pulse-selection signal processing algorithm to send the weak current signal collected by the current transformer to the dynamic monitoring controller for amplification and analysis. Combined with the strong anti-interference characteristics of the dual-pulse PLL signal transceiver module, it can accurately capture the fault current signal even if the grounding resistance of the grounding grid is high (such as dry soil or aging grounding grid), thus avoiding identification failure due to weak signal.
[0015] This invention uses a dual-pulse signal to lock the phase and current signals as comparison criteria, combined with real-time monitoring of the dynamic changes in three-phase voltage and phase changes. For non-steady-state faults such as intermittent arc grounding and resonant grounding, it does not need to rely on the traditional zero-sequence current amplitude and phase comparison method, and the line selection accuracy can reach 99%, solving the problem of poor adaptability of traditional devices to complex grounding types.
[0016] The dual-pulse PLL signal of this invention has no zero drift and strong anti-interference capability. It can stably lock the effective signal under operating scenarios such as system load changes, line switching, and transformer paralleling / disconnection. By comprehensively judging the multi-dimensional signals of current, voltage, and phase, it avoids misjudgment caused by changes in zero-sequence current distribution and improves the stability of system operation.
[0017] The pulse selection signal processing algorithm of this invention reduces the reliance on the accuracy of the zero-sequence current transformer (CT) through a combination of signal amplification, dual-pulse locking, and multi-dimensional comparison. Even if the transformer has slight inaccuracies, saturation, or installation process problems, it can be compensated for by multi-signal cross-verification, ensuring reliable line selection results.
[0018] This invention utilizes phase change monitoring and dual-pulse signal locking technology to distinguish between distributed capacitive current and actual fault current signals in cable lines. In multi-cable distribution networks, it can accurately locate fault circuits, solving the problem of identification difficulties caused by capacitive current masking fault signals in traditional devices.
[0019] This invention configures vacuum switches + wideband voltage absorbers and neutral point special protectors for arc grounding faults and overvoltage / resonance faults respectively, to achieve precise fault handling; through modules such as traction diagrams, event windows, and statistical reports, it realizes the visualization of fault location, traceability of event records, and automation of data statistics, thereby improving operation and maintenance efficiency; the modular design supports the addition of controllers and pulse selection units without the need for additional management backends, adapting to the needs of power grid expansion. Attached Figure Description
[0020] Figure 1This is a schematic diagram of the power grid grounding monitoring and management pulse selection backend system of the present invention; Figure 2 This is a display diagram of the power grid grounding monitoring and management pulse selection backend system of the present invention; Figure 3 This is a schematic diagram of the monitoring and processing of the electrical circuit architecture module of the present invention. Detailed Implementation
[0021] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.
[0022] Example 1: Please refer to Figure 1 - Figure 3 This embodiment of a power grid grounding monitoring and management pulse selection backend system includes an electrical line architecture module and a functional module. The electrical line architecture module includes a main bus and branch bus, with the branch bus being the branch lines after the main bus distributes power. By monitoring the electrical parameters of the main bus in real time, the electrical line architecture module can perceive the overall grounding status of the power grid and locate the zone of grounding fault. The electrical line architecture module uses a pulse selection signal processing algorithm to monitor the electrical parameters of each point in the power grid in real time. The backend system performs real-time analysis of the electrical parameters, and automatically triggers corresponding event recording and warnings when the parameters exceed the normal range or show abnormal changes. The functional module includes a traction graph module, an event window module, a statistical report module, a regression module, and an information detail table module.
[0023] Furthermore, the pulse selection signal processing algorithm acquires the current signal of the current transformer, sends it to the dynamic monitoring controller to amplify the current signal for comparative analysis. At the same time, the dynamic capture monitor captures the three-phase voltage, monitors the dynamic changes in voltage and the changes in system phase in real time, and transmits it to the dynamic monitoring controller for analysis. The dual-pulse signal transceiver module locks the acquired phase and current signals and makes comparison criteria. All signals are combined to make a judgment for line selection.
[0024] The electrical wiring architecture includes the main busbar and branch busbars. As the core trunk line for power transmission in the power grid, the main busbar undertakes the important task of distributing power to each branch busbar. By monitoring the electrical parameters of the main busbar (such as voltage, current, zero-sequence current, etc.) in real time, the system can quickly sense the overall grounding status of the power grid. Once a grounding-related anomaly occurs in the main busbar, the system can respond quickly.
[0025] The busbar is a branch line after the main busbar distributes power. It is responsible for supplying power to different areas or equipment. Monitoring the busbar can enable the zonal location of grounding faults and accurately determine the specific line segment where the fault occurred, providing a more precise range for fault investigation and handling.
[0026] (1) Traction diagram module Graphical representation: Using vector graphics technology, the topology of the power grid is drawn in an intuitive and clear way, including the connection relationship of the main bus and branch bus, as well as the distribution of load equipment on each line. The graphics can be flexibly configured and updated according to the actual power grid structure.
[0027] Real-time status display: On the traction diagram, the operating status of each line and equipment (such as normal operation, grounding fault, early warning, etc.) is displayed in real time through different colors and flashing icons of the pulse selection unit. Operators only need to check the traction diagram to quickly grasp the overall operation of the power grid, especially the abnormal points related to grounding.
[0028] Interactive operation: Clicking on a line or device on the traction diagram will bring up a detailed information window, displaying the electrical parameters, historical operating data, grounding event records, and other information for that section, allowing operators to gain a deeper understanding of the specific situation.
[0029] (2) Event Window Module Event capture: Utilizing high-precision pulse signal acquisition and processing technology, all grounding-related events during power grid operation are captured in real time, including the occurrence of grounding faults, the triggering of grounding warning signals, and the restoration of grounding status. The time accuracy of event capture can reach the millisecond level, ensuring that no critical events are missed.
[0030] Event Classification and Sorting: Captured events are classified according to severity (such as emergency failure, general warning, status recovery, etc.) and sorted and displayed in chronological order. Operators can quickly filter out the events that need to be focused on based on the classification.
[0031] Event details display: Clicking on an event in the event window allows you to view detailed information about the event, including the time the event occurred, the lines or equipment involved, changes in relevant electrical parameters, and the duration of the event. At the same time, the system will automatically record relevant operations for event handling (such as operators, handling time, and handling measures), forming a complete event handling closed loop.
[0032] (3) Statistical Report Module Data Acquisition and Integration: A large amount of grounding-related data is collected from various monitoring points and event records of the system, including the number of grounding faults, the duration of each fault, and the voltage and current values at the time of the fault. This data is then integrated and preprocessed to ensure the accuracy and consistency of the data.
[0033] Report generation: Automatically generate various statistical reports according to different needs (such as daily reports, weekly reports, monthly reports, annual reports, etc.); rich report formats, including tables, bar charts, line charts, pie charts, etc., to intuitively display the statistical results of ground data.
[0034] Report Analysis and Export: The system has built-in simple data analysis algorithms that can perform preliminary analysis of report data, such as calculating the average interval time of grounding faults and the average duration of fault handling. At the same time, reports can be exported to common formats such as Excel, which makes it convenient for operators to perform further data analysis or archive.
[0035] (4) Regression Module Manual reset: When the power grid grounding fault has been dealt with and the system status needs to be restored, the operator can perform a manual reset operation through the reset module. During manual reset, the system will first perform relevant status checks, and after confirming that the fault has been eliminated, it will execute the reset command to restore the system to the normal monitoring status.
[0036] Automatic reset: For some grounding-related states caused by transient interference and other reasons that can recover on their own without manual intervention, the system can automatically perform reset operations according to preset conditions (such as the disappearance of the grounding signal and its duration for a certain period of time), thereby improving the automation level of system operation and reducing the amount of manual operation.
[0037] Regression Records: Every regression operation (whether manual or automatic) is recorded in detail by the system, including the regression time, regression type, operator (in manual regression), and status before regression, which facilitates the subsequent traceability and management of regression operations.
[0038] (5) Detailed Information Table Module Information storage: Employing high-capacity database storage technology, it comprehensively retains all detailed information related to power grid grounding, including complete process data for each grounding event (such as all electrical parameter change curves from the occurrence to the end of the event), equipment grounding history records, system configuration information, operator operation logs, etc.
[0039] Information Query: Provides powerful information query functions, supporting combined queries based on various conditions such as time range, line name, equipment number, and event type. Operators can quickly find the grounding-related information they need, such as querying details of all grounding events of a certain device in the past year.
[0040] Information Export and Printing: Supports exporting detailed information from queries to text, tables, and other formats, and also allows direct printing, providing comprehensive and detailed data support for power grid inspection, maintenance, fault analysis, and other work.
[0041] The power grid grounding monitoring and management pulse selection backend system of the present invention can perform high-precision grounding monitoring: with the help of advanced pulse selection signal processing algorithms, it can monitor electrical parameters such as voltage, current, and zero-sequence component at various points of the power grid in real time, accurately identify grounding faults, and achieve a fault detection accuracy of over 99%, with a response time of no more than 20 milliseconds, ensuring that grounding problems are detected as soon as possible.
[0042] The power grid grounding monitoring and management pulse selection backend system of this invention can intelligently record and warn of events: based on preset thresholds and logical rules, it performs real-time analysis on the collected electrical parameters. When the parameters exceed the normal range or show abnormal changes, it automatically triggers corresponding event recording and warnings. Warning methods include sound alarms, pop-up prompts, and SMS notifications (requires an external SMS module), ensuring that operators receive abnormal information in a timely manner.
[0043] 1. Comprehensiveness: It covers the entire lifecycle of power grid grounding monitoring and management, from grounding monitoring and event management to data statistical analysis and fault handling assistance.
[0044] 2. Accuracy: It has extremely high accuracy in data acquisition, event identification, and fault location, ensuring that every piece of grounding-related information is accurate and error-free, providing a reliable basis for power grid operation and management decisions, and avoiding misjudgments and misoperations caused by information errors.
[0045] 3. High Efficiency: The various modules of the system work collaboratively, and information transmission and processing are efficient and smooth. For example, after an event occurs, the traction diagram immediately displays the abnormal location, the event window records details synchronously, and statistical reports automatically update relevant data, greatly shortening the time from problem discovery to problem resolution and improving the overall efficiency of power grid operation and maintenance.
[0046] 4. Stability: It adopts industrial-grade hardware and rigorously tested software systems, which have strong anti-interference capabilities and stable operating performance. It can operate continuously for a long time in complex power grid environments, with an average mean time between failures of more than 10,000 hours, ensuring the continuous and stable operation of power grid monitoring.
[0047] 5. Scalability: The system architecture adopts a modular design, which facilitates subsequent expansion according to the customer's new expansion needs. There is no need to add a new management backend. You only need to add KCXK dynamic controllers and a corresponding number of pulse selection units on the original basis.
[0048] Pulse selection technology is used to detect grounding faults in a high-voltage system circuit. First, the vacuum switch closes to release fault energy to ground, forming a ground loop with the feeder branch. The feeder branch current increases, and the current signal from the current transformer is collected and sent to the dynamic monitoring controller KCXK to amplify the current signal for comparative analysis.
[0049] Then, the dynamic capture monitor captures the three-phase voltages of the system (A, B, and C), monitors the dynamic changes in voltage and the changes in system phase in real time, and transmits the data to the dynamic monitoring controller for analysis.
[0050] A dual-pulse PLL signal transceiver module is then employed, with a pulse width adjustable to 20%. It locks onto the phase and current signals within a specific segment and compares them against real-time dynamic phase and current signals. The transmission and reception are compared to these signals, and all signals are used to determine the optimal line selection. The dual-pulse PLL signal facilitates long-distance transmission, has no zero drift, and possesses strong anti-interference capabilities, enabling a line selection accuracy of 99%. The system also transmits operating status and fault signals to the backend via RS-485 communication or contact signals.
[0051] When an intermittent arc or permanent arc grounding fault occurs in a certain circuit of the system, the full voltage controller KCGK detects the change in system voltage and activates the vacuum switch to eliminate the system arc. After the system arc is eliminated, the broadband voltage absorber absorbs the system voltage spike, making the system voltage stable and ensuring the safety of equipment power supply.
[0052] When the system experiences overvoltage fluctuations, high-resistance grounding, metallic grounding, or transient or permanent grounding faults, the system generates low-frequency, medium-frequency, or high-frequency oscillations, causing primary and secondary resonances. At this time, the full-voltage controller KCGK issues a command to activate the neutral point special protector to eliminate the primary and secondary resonances and ensure the safe operation of the system.
[0053] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.
Claims
1. A power grid grounding monitoring and management pulse selection backend system, comprising an electrical line architecture module and a functional module, characterized in that, The electrical line architecture module includes a main bus and branch busbars. The branch busbars are the branch lines after the main busbar's power is distributed. By monitoring the electrical parameters of the main busbar in real time, the electrical line architecture module can perceive the overall grounding status of the power grid. The electrical line architecture module can locate the zone of grounding fault. The electrical line architecture module uses a pulse selection signal processing algorithm to monitor the electrical parameters of each point in the power grid in real time. The background system performs real-time analysis of the electrical parameters. When the parameters exceed the normal range or show abnormal changes, it automatically triggers corresponding event recording and warning. The functional modules include a traction graph module, an event window module, a statistical report module, a regression module, and an information detail table module.
2. The power grid grounding monitoring and management pulse selection backend system according to claim 1, characterized in that, The pulse selection signal processing algorithm first acquires the current signal of the current transformer, sends it to the dynamic monitoring controller to amplify the current signal, and then performs comparative analysis. At the same time, the dynamic capture monitor captures the three-phase voltage, monitors the dynamic change of voltage and the change of system phase in real time, and transmits it to the dynamic monitoring controller for analysis. Then, through the dual-pulse signal transceiver module, the acquired phase and current signals are locked and compared according to the criteria. The algorithm uses all signals as criteria to select the line.
3. The power grid grounding monitoring and management pulse selection backend system according to claim 2, characterized in that, After detecting a ground fault, the electrical circuit architecture module sends a command to the full voltage controller and executes corresponding actions. If it is an arc ground fault, the vacuum switch is activated to eliminate the arc, and the broadband voltage absorber absorbs the peak voltage. If it is an overvoltage or resonance fault, the neutral point special protector is activated to eliminate the primary and secondary resonances.
4. The power grid grounding monitoring and management pulse selection backend system according to claim 1, characterized in that, The traction graph module includes graphical display and real-time status display, and the traction graph module can be interactively operated.
5. The power grid grounding monitoring and management pulse selection backend system according to claim 1, characterized in that, The event window module captures all grounding-related events in real time during the operation of the power grid, classifies the captured events according to their severity, sorts and displays them in chronological order, and allows users to view detailed event information.
6. The power grid grounding monitoring and management pulse selection backend system according to claim 1, characterized in that, The statistical report module collects, integrates, and preprocesses data, then automatically generates various statistical reports and exports them in common formats.
7. The power grid grounding monitoring and management pulse selection backend system according to claim 1, characterized in that, The regression module includes manual regression operation, automatic regression operation, and recording of regression operations.
8. The power grid grounding monitoring and management pulse selection backend system according to claim 1, characterized in that, The detailed information table module can store complete process data information of grounding events, as well as query, export and print the information data.
9. The power grid grounding monitoring and management pulse selection backend system according to claim 1, characterized in that, After a grounding event occurs, the traction graph module displays the abnormal location, the event window module records the details synchronously, and the statistical report module automatically updates the relevant data.