Ground fault troubleshooting system for ten-thousand-volt power distribution network

Abstract

The invention provides a ten-thousand-volt power distribution network ground fault troubleshooting system, which comprises signal acquisition modules installed at nodes of a power distribution network, and a fault diagnosis module for calculating a first fault evaluation parameter according to node information acquired by the signal acquisition modules, the fault positioning module is used for positioning a corresponding fault point according to a fault signal output by the fault diagnosis module; and the operation module is used for interacting with a user. It can be seen that the real-time current and the real-time voltage of the node where the current sensor and the voltage sensor are located are collected, the first error evaluation parameter is calculated according to the current deviation and voltage fluctuation comprehensive evaluation formula, and if the first error evaluation parameter is larger than the first threshold value, the fault signal is output, so that the labor cost is reduced; and through automatic detection and calculation, the power distribution network troubleshooting efficiency is remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of leakage detection of power systems, and in particular to a grounding fault troubleshooting system for a 10,000-volt distribution network. Background Art

[0002] With the rapid development of the power industry and the continuous advancement of smart grid construction, the 10kV distribution network, as an important infrastructure for urban and rural power supply, its operating stability and reliability are crucial to ensuring social production and residents' lives. However, in the actual operation of the distribution network, ground faults, as a common type of power fault, have brought great challenges to operation and maintenance personnel due to their frequent occurrence, complex causes and difficulty in rapid positioning.

[0003] Traditional ground fault troubleshooting methods mainly rely on manual inspections and simple instrument measurements. This method is not only inefficient, but also easily affected by environmental, weather and other factors, resulting in inaccurate or delayed fault troubleshooting. In addition, with the continuous expansion of the scale and increase in complexity of distribution networks, traditional troubleshooting methods have been unable to meet the needs of quickly and accurately locating fault points.

[0004] In summary, how to improve the efficiency of power distribution network fault troubleshooting is a technical problem that technical personnel in this field currently need to solve. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a 10,000-volt distribution network grounding fault troubleshooting system, which can significantly improve the efficiency of distribution network fault troubleshooting. The specific scheme is as follows:

[0006] A 10,000-volt distribution network grounding fault troubleshooting system includes a signal acquisition module installed at each node of the distribution network, a fault diagnosis module that calculates a first fault assessment parameter based on node information acquired by the signal acquisition module, a fault location module that locates a corresponding fault point based on a fault signal output by the fault diagnosis module, and an operation module for interacting with a user, wherein:

[0007] The signal acquisition module includes a current sensor and a voltage sensor, and the node information includes the real-time current and real-time voltage of the node;

[0008] The fault diagnosis module includes a statistical unit for calculating the average current of each node of the distribution network, an error evaluation parameter calculation unit for calculating a first error evaluation parameter according to a comprehensive evaluation formula of current deviation and voltage fluctuation, and a fault judgment unit for judging whether the first error evaluation parameter exceeds a first threshold value. If the first error evaluation parameter is greater than the first threshold value, the fault judgment unit outputs the fault signal, wherein the calculation method of the comprehensive evaluation formula of current deviation and voltage fluctuation at the i-th node is:

[0009]

[0010] Among them, the C i is the error evaluation parameter, the I i is the real-time current of the i-th node, the I avg is the average current of the ith node, the V i is the real-time voltage of the ith node, δ is the standard deviation function, and V nom is the rated voltage, and the α and the β are weight coefficients.

[0011] Preferably, the signal acquisition module also includes a temperature sensor and a humidity sensor.

[0012] Preferably, the error assessment parameter unit further calculates a second error assessment parameter according to an environmental factor assessment formula, and the first error assessment parameter and the second error assessment parameter are estimated to obtain a first comprehensive error assessment parameter, wherein the calculation method of the environmental factor assessment formula at the i-th node is:

[0013]

[0014] Among them, the H i is the second error evaluation parameter, the A ix is the specific measured value of the xth environmental parameter at the i-th node, the ω x is the weight coefficient corresponding to the environmental parameter, and θ is the weight coefficient;

[0015] The calculation method of the first comprehensive error evaluation parameter at the i-th node is:

[0016] T i =σ*C i +(1-σ)*H i

[0017] Among them, the T i is the first comprehensive error evaluation parameter, and σ is an adjustment factor used to balance the weights of the first error evaluation parameter and the second error evaluation parameter.

[0018] If the first comprehensive error evaluation parameter is greater than a second threshold, the fault judgment unit outputs the fault signal, otherwise it does not output the fault signal.

[0019] Preferably, the 10,000-volt distribution network grounding fault troubleshooting system also includes a database for recording data generated by the signal acquisition module, the fault diagnosis module, the fault diagnosis module, the fault location module and the operation module, and storing historical fault cases of each node in the distribution network.

[0020] Preferably, the error assessment parameter unit further calculates a third error assessment parameter according to a comprehensive assessment formula of environmental factors and historical data, and the first error assessment parameter and the third error assessment parameter are estimated to obtain a second comprehensive error assessment parameter, wherein the calculation method of the comprehensive environmental factors and historical data at the i-th node is:

[0021]

[0022] Among them, K i is the third error evaluation parameter, the A ix is the specific measured value of the xth environmental parameter at the i-th node, the ω x is the weight coefficient corresponding to the environmental parameter, the B y (i) is the impact factor of the yth historical fault case on the i-th node, the θ and is the weight coefficient,

[0023] The calculation method of the second comprehensive error evaluation parameter at the i-th node is:

[0024] Q i =σ*C i +(1-σ)*H i

[0025] Among them, the Q i is the second comprehensive error evaluation parameter, and the σ is an adjustment factor used to balance the weights of the first error evaluation parameter and the second error evaluation parameter.

[0026] Preferably, the 10,000-volt distribution network grounding fault detection system also includes a wireless communication module.

[0027] 7. The 10,000-volt distribution network grounding fault troubleshooting system according to claim 6 is characterized in that the signal acquisition module also includes a calibration unit for automatically calibrating the measurement accuracy of the current sensor, the voltage sensor, the temperature sensor and the humidity sensor according to preset conditions.

[0028] Preferably, the 10,000-volt distribution network grounding fault troubleshooting system also includes a fault assessment module, which is used to generate maintenance suggestions for the fault point based on the information processed by the signal acquisition module, the fault diagnosis module and the fault location module, combined with historical fault cases in the database.

[0029] The present invention provides a 10,000-volt distribution network grounding fault troubleshooting system, comprising a signal acquisition module installed at each node of the distribution network, a fault diagnosis module that calculates a first fault assessment parameter based on the node information acquired by the signal acquisition module, a fault location module that locates the corresponding fault point based on the fault signal output by the fault diagnosis module, and an operation module for interacting with a user. It can be seen that the present invention collects the real-time current and real-time voltage of the node through a current sensor and a voltage sensor, calculates the first error assessment parameter according to the comprehensive evaluation formula of current deviation and voltage fluctuation, and outputs the fault signal if the first error assessment parameter is greater than a first threshold, thereby reducing labor costs and significantly improving the efficiency of distribution network fault troubleshooting through automated detection and calculation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the implementation scheme of the present invention or the technical scheme in the prior art, the drawings required for use in the implementation scheme or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only the implementation scheme of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0031] Figure 1 A schematic structural diagram of a 10,000-volt distribution network grounding fault troubleshooting system provided for an implementation scheme of the present invention. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] The embodiment of the present invention provides a 10,000-volt distribution network grounding fault detection system. Figure 1 As shown, it includes a signal acquisition module 1 installed at each node of the distribution network, a fault diagnosis module 2 for calculating a first fault assessment parameter according to the node information obtained by the signal acquisition module, a fault location module 3 for locating a corresponding fault point according to the fault signal output by the fault diagnosis module, and an operation module 4 for interacting with a user, wherein:

[0034] The signal acquisition module includes a current sensor 11 and a voltage sensor 12, and the node information includes the real-time current and real-time voltage of the node;

[0035] The above-mentioned fault diagnosis module includes a statistical unit for calculating the average current of each node of the above-mentioned distribution network, an error evaluation parameter calculation unit for calculating a first error evaluation parameter according to a comprehensive evaluation formula of current deviation and voltage fluctuation, and a fault judgment unit for judging whether the above-mentioned first error evaluation parameter exceeds a first threshold value. If the above-mentioned first error evaluation parameter is greater than the above-mentioned first threshold value, the above-mentioned fault judgment unit outputs the above-mentioned fault signal, wherein the calculation method of the above-mentioned comprehensive evaluation formula of current deviation and voltage fluctuation at the i-th node is:

[0036]

[0037] Among them, the above C i is the error evaluation parameter, the above I i is the real-time current of the i-th node, and the above I avg is the average current of the above-mentioned i-th node, and the above-mentioned V i is the real-time voltage of the ith node, the above δ is the standard deviation function, and the above V nom is the rated voltage, and the above α and the above β are weighting coefficients.

[0038] In order to improve the accuracy of fault detection and troubleshooting, the signal acquisition module also includes a temperature sensor and a humidity sensor.

[0039] It is understandable that the working environment of different nodes in the distribution network is different. The signal acquisition module of some nodes only needs to be equipped with current sensors and voltage sensors, while the working environment of some nodes is complex and the node environmental factors need to be considered. Therefore, current sensors, voltage sensors, temperature sensors and humidity sensors need to be set. Of course, some nodes affected by a single environmental factor only need to be equipped with temperature sensors or humidity sensors in addition to current sensors and voltage sensors.

[0040] The error evaluation parameter unit further calculates a second error evaluation parameter according to the environmental factor evaluation formula, and the first error evaluation parameter and the second error evaluation parameter are estimated to obtain a first comprehensive error evaluation parameter, wherein the calculation method of the environmental factor evaluation formula at the i-th node is:

[0041]

[0042] Among them, the above H i is the second error evaluation parameter, the above A ixis the specific measurement value of the xth environmental parameter on the above-mentioned i-th node. It can be understood that if the i-th node is only equipped with a temperature sensor, the xth environmental parameter is temperature; if it is only equipped with a humidity sensor, the xth environmental parameter is humidity; if both a temperature sensor and a humidity sensor are provided, a combined calculation is performed. Of course, it is necessary to analyze according to the specific situation of the i-th node. The above ω x is the weight coefficient corresponding to the environmental parameter, and the above θ is the weight coefficient;

[0043] The calculation method of the first comprehensive error evaluation parameter at the i-th node is:

[0044] T i =σ*C i +(1-σ)*H i

[0045] Among them, the above T i is the first comprehensive error assessment parameter, and the above σ is an adjustment factor, which is used to balance the weights of the first error assessment parameter and the second error assessment parameter, that is, to balance the weights of current and voltage assessment and environmental assessment. This formula is a combination of the above two assessment formulas. The weights of current and voltage assessment and environmental assessment are balanced by the adjustment factor σ, thereby obtaining the comprehensive fault risk of the i-th node. The adjustment factor is used to adjust the weight ratio of the two parts of the assessment, which can be adjusted according to the actual situation of the distribution network.

[0046] The fault judgment unit determines whether to output the fault signal by judging the relationship between the first comprehensive error evaluation parameter and the second threshold value. If the first comprehensive error evaluation parameter is greater than the second threshold value, the fault judgment unit outputs the fault signal; otherwise, the fault judgment unit does not output the fault signal.

[0047] In order to further improve the accuracy of troubleshooting, a specific implementation scheme disclosed in the present invention also includes a database for recording data generated by the signal acquisition module, the fault diagnosis module, the fault location module and the operation module, and storing historical fault cases of each node in the distribution network.

[0048] The error evaluation parameter unit further calculates a third error evaluation parameter according to a comprehensive evaluation formula of environmental factors and historical data. The first error evaluation parameter and the third error evaluation parameter are estimated to obtain a second comprehensive error evaluation parameter, wherein the calculation method of the environmental factors and historical data integrated at the i-th node is:

[0049]

[0050] Among them, K i is the third error evaluation parameter, the above A ixis the specific measured value of the xth environmental parameter at the i-th node. x is the weight coefficient corresponding to the environmental parameter. y (i) is the impact factor of the yth historical fault case on the above i-th node, the above θ and the above is the weight coefficient,

[0051] The calculation method of the second comprehensive error evaluation parameter at the i-th node is:

[0052] Q i =σ*C i +(1-σ)*H i

[0053] Among them, the above Q i is the second comprehensive error assessment parameter, and the above σ is an adjustment factor, which is used to balance the weights of the first error assessment parameter and the second error assessment parameter, that is, to balance the weights of the current and voltage assessment and the environmental historical fault case assessment. This formula is a combination of the above two assessment formulas. The weights of the current and voltage assessment and the environmental historical fault case assessment are balanced by the adjustment factor σ, thereby obtaining the comprehensive fault risk of the i-th node. The adjustment factor is used to adjust the weight ratio of the two parts of the assessment, which can be adjusted according to the actual situation of the distribution network.

[0054] In order to improve the user experience, the specific embodiment provided by the present invention also includes a wireless communication module. Wireless transmission can enable users to perform troubleshooting operations through mobile devices. At this time, the operation module can be a mobile device such as a computer or a mobile phone.

[0055] The wireless communication module realizes real-time data transmission between modules. Each sensor is equipped with a wireless communication module, which enables the sensor to transmit the collected data to the data processing and storage module or other related systems in real time. The wireless communication module may adopt various wireless communication technologies, such as Zigbee, LoRa, NB-IoT, etc., to ensure stable and efficient data transmission. Through wireless communication, remote and real-time monitoring of the distribution network can be achieved, thereby improving the efficiency and accuracy of troubleshooting.

[0056] Of course, the present invention also supports wired transmission.

[0057] In order to further improve the accuracy of troubleshooting, the present invention also provides a specific implementation scheme, wherein the signal acquisition module also includes a calibration unit for automatically calibrating the measurement accuracy of the current sensor, the voltage sensor, the temperature sensor and the humidity sensor according to preset conditions.

[0058] The signal acquisition module includes a calibration unit, which is used to automatically calibrate each sensor according to preset conditions to ensure its measurement accuracy. The preset conditions include regular, fixed times or reaching other preset values. During long-term operation, the sensor may be affected by various factors (such as ambient temperature changes, mechanical stress, etc.), resulting in a decrease in its measurement accuracy. Through the adaptive calibration mechanism, the sensor can automatically adjust its parameters or settings to restore or maintain its measurement accuracy. This automatic calibration function reduces the need for manual maintenance and improves the reliability and stability of the system.

[0059] In order to further improve the efficiency of troubleshooting, the present invention also provides a specific implementation scheme, which also includes a fault assessment module for generating maintenance suggestions for the fault point based on the information processed by the above-mentioned signal acquisition module, the above-mentioned fault diagnosis module and the above-mentioned fault location module, combined with the historical fault cases in the above-mentioned database.

[0060] Maintenance recommendations are automatically generated based on the evaluation results of the fault diagnosis module, including recommended maintenance measures, a list of required tools and materials, and estimated maintenance time and cost. Based on the complexity and urgency of the maintenance recommendations, the system automatically selects technicians with corresponding skills and experience from the preset technician database and arranges them to go to the site to handle the fault. The technician database contains information such as the technician's professional skills, work experience, current location and availability. The system matches them through algorithms to ensure that the technicians dispatched to the site can quickly and effectively resolve the fault.

[0061] Based on the evaluation results of the fault diagnosis module, the system first conducts a comprehensive evaluation of the fault risks of each node in the distribution network through the fault diagnosis module. This evaluation may take into account multiple aspects such as current deviation, voltage fluctuation, environmental factors, and historical fault data. According to the results of the risk assessment, the system automatically generates maintenance steps for specific faults. These steps may include checking specific equipment, replacing damaged parts, adjusting system parameters, etc. The system will also list the tools and materials required to perform these maintenance steps to ensure that technicians can smoothly perform maintenance work on site. According to the complexity of the maintenance and the required resources, the system will estimate the approximate time and cost required to complete the maintenance, which is helpful for resource planning and budget control. The system maintains a database containing technician information, which may include the technician's professional skills, work experience, current location, and availability status. The system will evaluate the qualifications and experience level of the required technicians based on the complexity of the maintenance proposal and the urgency of the fault. Based on the above evaluation, the system will automatically select technicians with corresponding skills and experience from the technician database and arrange them to go to the fault site for processing. This intelligent matching can ensure that the technicians dispatched to the site can quickly and effectively solve the fault, thereby improving maintenance efficiency and system reliability.

[0062] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0063] The above is a detailed introduction to a 10,000-volt distribution network grounding fault troubleshooting system provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above implementation plan is only used to help understand the method of the present invention and its core idea; at the same time, for general technical personnel in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A 10,000-volt distribution network grounding fault troubleshooting system, characterized in that: It includes a signal acquisition module installed at each node of the distribution network, a fault diagnosis module that calculates a first fault assessment parameter according to the node information obtained by the signal acquisition module, a fault location module that locates the corresponding fault point according to the fault signal output by the fault diagnosis module, and an operation module for interacting with a user, wherein: The signal acquisition module includes a current sensor and a voltage sensor, and the node information includes the real-time current and real-time voltage of the node; The fault diagnosis module includes a statistical unit for calculating the average current of each node of the distribution network, an error evaluation parameter calculation unit for calculating a first error evaluation parameter according to a comprehensive evaluation formula of current deviation and voltage fluctuation, and a fault judgment unit for judging whether the first error evaluation parameter exceeds a first threshold value. If the first error evaluation parameter is greater than the first threshold value, the fault judgment unit outputs the fault signal, wherein the calculation method of the comprehensive evaluation formula of current deviation and voltage fluctuation at the i-th node is: Among them, the C i is the error evaluation parameter, the I i is the real-time current of the i-th node, the I avg is the average current of the ith node, the V i is the real-time voltage of the ith node, δ is the standard deviation function, and V nom is the rated voltage, and the α and the β are weight coefficients.

2. The 10,000-volt distribution network grounding fault troubleshooting system according to claim 1 is characterized in that: The signal acquisition module also includes a temperature sensor and a humidity sensor.

3. The 10,000-volt distribution network grounding fault troubleshooting system according to claim 2 is characterized in that: The error assessment parameter unit further calculates a second error assessment parameter according to the environmental factor assessment formula, and the first error assessment parameter and the second error assessment parameter are estimated to obtain a first comprehensive error assessment parameter, wherein the calculation method of the environmental factor assessment formula at the i-th node is: Among them, the H i is the second error evaluation parameter, the ix is the specific measured value of the xth environmental parameter at the i-th node, the ω x is the weight coefficient corresponding to the environmental parameter, and θ is the weight coefficient; The calculation method of the first comprehensive error evaluation parameter at the i-th node is: T i =σ*C i +(1-σ)*H i Among them, the T i is the first comprehensive error evaluation parameter, and σ is an adjustment factor used to balance the weights of the first error evaluation parameter and the second error evaluation parameter. If the first comprehensive error evaluation parameter is greater than a second threshold, the fault judgment unit outputs the fault signal, otherwise it does not output the fault signal.

4. The 10,000-volt distribution network grounding fault troubleshooting system according to claim 3 is characterized in that: It also includes a database for recording data generated by the signal acquisition module, the fault diagnosis module, the fault location module and the operation module and storing historical fault cases of each node in the distribution network.

5. The 10,000-volt distribution network grounding fault troubleshooting system according to claim 4 is characterized in that: The error evaluation parameter unit further calculates a third error evaluation parameter according to a comprehensive evaluation formula of environmental factors and historical data, and the first error evaluation parameter and the third error evaluation parameter are estimated to obtain a second comprehensive error evaluation parameter, wherein the calculation method of the comprehensive environmental factors and historical data at the i-th node is: Among them, K i is the third error evaluation parameter, the A ix is the specific measured value of the xth environmental parameter at the i-th node, the ω x is the weight coefficient corresponding to the environmental parameter, the B y (i) is the impact factor of the yth historical fault case on the i-th node, the θ and is the weight coefficient, The calculation method of the second comprehensive error evaluation parameter at the i-th node is: Q i =σ*C i +(1-σ)*H i Among them, the Q i is the second comprehensive error evaluation parameter, and the σ is an adjustment factor used to balance the weights of the first error evaluation parameter and the second error evaluation parameter.

6. The 10,000-volt distribution network grounding fault troubleshooting system according to claim 5, characterized in that: A wireless communication module is also included.

7. The 10,000-volt distribution network grounding fault troubleshooting system according to claim 6, characterized in that: The signal acquisition module further includes a calibration unit for automatically calibrating the measurement accuracy of the current sensor, the voltage sensor, the temperature sensor, and the humidity sensor according to preset conditions.

8. The 10,000-volt distribution network grounding fault troubleshooting system according to claim 3 is characterized in that: It also includes a fault assessment module, which is used to generate maintenance suggestions for the fault point based on the information processed by the signal acquisition module, the fault diagnosis module and the fault location module, combined with historical fault cases in the database.

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