Distributed power distribution network area residual current intelligent monitoring system
By installing a distributed distribution network station area intelligent monitoring system for residual current in the distribution network station area, the problems of difficulty in detecting leakage faults, incomplete monitoring, and inaccurate data recording and data analysis in the existing technology are solved, and accurate monitoring of residual current in the station area and rapid fault positioning are achieved, which improves power supply reliability and reduces safety hazards.
Patent Information
- Application Number
- CN202510076830.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-17
- Publication Date
- 2025-05-13
AI Technical Summary
The existing distribution network station area has difficulty in detecting leakage faults, incomplete monitoring, and inaccurate data recording and data analysis, resulting in frequent tripping of leakage protectors, affecting customers' power consumption experience, and posing safety hazards.
Design a distributed distribution network station area residual current intelligent monitoring system, including residual current monitoring terminal and cloud management platform. The monitoring terminal adopts an open-closed residual current sensor, a multi-channel AD sampling circuit, a positioning and timing circuit, a main control MCU, a wireless communication module and a power management module to detect and collect residual current signals in real time, and send data to the cloud management platform through the wireless communication module in real time. The cloud platform has a built-in data analysis module that automatically analyzes leakage abnormalities, accurately locates fault branches, and alerts managers through SMS.
It realizes accurate monitoring of the remaining current in the station area and rapid fault positioning, reduces the intensity of operation and maintenance, improves power supply reliability, and reduces the occurrence of leakage safety accidents.
Smart Images
Figure CN119995146A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of intelligent monitoring technology, in particular to an intelligent monitoring system for residual current in a distributed power distribution network area. Background Art
[0002] As the scale of urban power grids continues to expand, the requirements for power supply reliability are increasing. The leakage protector of 400V low-voltage distribution network has been widely used. Due to various problems such as long operating life and abnormal aging of lines, leakage accidents may occur in the branch lines under the distribution station, which will cause the leakage protector to trip, easily causing frequent power outages for customers and seriously affecting the service quality of the power company. However, since the leakage protector has no current recording function, it is impossible to conduct a root cause analysis of the leakage current fault in the entire station. In addition, the workload of finding the root cause of leakage in the station is huge. If the fault is found for a long time, the station will continue to trip repeatedly, seriously affecting the customer's electricity experience. Therefore, when the power supply service team is repairing on site, they can only use methods such as dismantling or short-circuiting to bypass the leakage protector and restore power supply to users as soon as possible. However, the loss of the leakage protector may cause power theft and personal electric shock accidents, which poses a major safety hazard.
[0003] At present, when a leakage protection device trips in a distribution network area and causes a power outage in the area, power supply service personnel use a clamp-type leakage current measuring instrument to conduct on-site measurements at each point along the line of the area. A comprehensive investigation of the first-level branch, second-level branch and terminal meter box under the area often requires a lot of work to capture abnormal leakage accident points in the area. The traditional clamp-type leakage current measuring instrument is a non-continuous and simple leakage current measuring instrument that does not have the functions of data recording and abnormal mutation event detection, and cannot effectively monitor sudden and intermittent leakage problems.
[0004] In addition, in actual work, the residual current values measured at different times at various on-site points are not synchronized when troubleshooting the fault points step by step in the substation, so it is impossible to effectively trace and compare the fault points. In addition, there are many lines and terminal measurement points at all levels in the substation, and the workload of troubleshooting the fault points with large residual currents is huge, and the measurement and recording methods lack scientificity. Summary of the invention
[0005] The present invention provides an intelligent residual current monitoring system for a distributed distribution network substation to solve the problems of difficulty in troubleshooting leakage faults, incomplete monitoring, inaccurate data recording and data analysis in the prior art, and to achieve accurate monitoring of residual current in the substation and rapid fault location.
[0006] The technical solution of the present invention is as follows:
[0007] A distributed distribution network area residual current intelligent monitoring system, comprising:
[0008] The residual current monitoring terminal is used to detect the residual current at the installation location in real time; the residual current monitoring terminal module includes an open-close residual current sensor, a multi-channel AD sampling circuit, a positioning timing circuit, a main control MCU, a wireless communication module, and a power management module;
[0009] The cloud management platform has a built-in data analysis module that can manage all residual current monitoring terminals in the entire region in real time and process and analyze data;
[0010] The current signal is collected through the built-in opening and closing residual current sensor and multi-channel AD sampling circuit of the residual current monitoring terminal and sent to the cloud management platform. The built-in data analysis module of the cloud management platform automatically analyzes the abnormal leakage situation in the substation area, cooperates with the positioning and timing circuit of the residual current monitoring terminal to accurately locate the branch line with abnormal leakage current, and sends alarm prompt text messages to the designated substation management personnel in real time through the wireless communication module of the residual current monitoring terminal.
[0011] Furthermore, the cloud management platform has a built-in file management unit, which supports adding or reducing residual current monitoring terminals in the substation, managing the relationship between the front and back levels of the residual current monitoring terminals, and setting the alarm setting value of the residual current monitoring terminal. The cloud management platform can remotely send down the monitoring alarm setting value of each monitoring terminal, and adjust and modify it in time, so as to facilitate on-site investigation of the source of leakage fault.
[0012] Furthermore, the cloud management platform issues fixed tasks at set times, and each residual current monitoring terminal monitors at the set time and uploads the recorded values in real time. At the same time, the cloud management platform collects data from all residual current monitoring terminals in the substation area and synchronously analyzes their real-time values, using graphics to fully display the real-time situation of the substation residual current, and synchronously updates the residual current data of the entire substation area at the millisecond level, accurately determining the key points of leakage. The cloud system platform can accurately lock the residual current values of relevant nodes such as the total protection, intermediate protection, and household protection when a fault occurs, automatically store records and analyze, and the leakage branches and specific terminal points under the substation area can be intuitively discovered.
[0013] Furthermore, the cloud management platform has built-in user management units, area management units and terminal management units, which are used to add or delete users, add or delete areas and add or delete terminals respectively. The cloud management platform supports the deployment of any number of residual current monitoring terminals under the area, and supports any number of areas to perform monitoring tasks concurrently.
[0014] Furthermore, the residual current monitoring terminal integrates three functions: open and close residual current sensor, intelligent collection and analysis, and Internet of Things communication. It has a plug-and-play design on site and is easy to deploy. It has a built-in lithium battery and a lithium battery charging management circuit to meet the power endurance for long-term continuous work. It adopts a waterproof sealed insulation structure to meet the weather resistance requirements in various distribution boxes, outdoor poles and other scenarios. The current sensor of the residual current monitoring terminal supports different sizes and specifications. It supports multiple specifications with diameters of 10 mm, 16 mm, 24 mm, 30 mm, 50 mm, 100 mm, 250 mm, etc., and supports large-diameter flexible Rogowski coils with a length of 800 mm.
[0015] Furthermore, the residual current monitoring terminal has a built-in high-speed sampling and data processing module, which can control the recording time of the characteristic fault mutation of leakage within 10 milliseconds. The residual current monitoring terminal can set and adjust the residual current trigger alarm threshold through the cloud management platform. Once the characteristic fault mutation of the leakage current is triggered, the residual current monitoring terminal automatically sends the recorded residual current value and event recording time to the cloud management platform. The residual current monitoring terminal adopts Beidou and GPS dual-mode positioning and timing technology, and realizes accurate timing within 1 millisecond through hardware. It can synchronously and accurately identify the mutation residual current events, avoiding the failure of fault section search and analysis due to time inconsistency. The residual current monitoring terminal has a built-in GPRS / 4G / 5G dedicated communication module and a dedicated Internet of Things SIM card, which can directly interact with the cloud management platform for data.
[0016] Furthermore, the cloud management platform does not require the installation of client programs, and various function settings and inquiries are performed through web pages.
[0017] Compared with the prior art, the present invention has the following beneficial effects:
[0018] 1. The present invention is powered by lithium batteries and adopts a waterproof sealed insulation structure to achieve convenient on-site installation. The system end is flexibly deployed and plug-and-play. By installing residual current monitoring terminals at key nodes, abnormal residual currents in branch circuits at all levels and at the ends can be quickly discovered.
[0019] 2. The present invention can accurately lock the residual current value of the relevant node when the event occurs through the cloud management platform, automatically store and analyze the recorded data, and intuitively find the leakage branch and terminal point.
[0020] 3. The present invention synchronizes the data recording and event recording time of the residual current monitoring terminal through precise timing, with an accuracy of less than 1 millisecond, and can accurately identify sudden residual current events to avoid failure in fault section search and analysis due to time inconsistency.
[0021] 4. The present invention supports any number of residual current monitoring terminals in a substation to perform monitoring tasks in multiple substations at the same time through a cloud management platform, realizes synchronous real-time monitoring of residual current in the entire distribution network substation, provides accurate quantitative analysis for leakage tripping fault troubleshooting, reduces the intensity of operation and maintenance work, improves power supply reliability, and prevents the occurrence of leakage safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a position diagram of the residual current monitoring terminal installed on the main switch, branch switch, secondary branch switch and end user switch on the low-voltage side of the transformer of the present invention.
[0023] Figure 2 It is a structural diagram of the residual current monitoring terminal of the present invention.
[0024] Figure 3 It is a system architecture diagram of the present invention. DETAILED DESCRIPTION
[0025] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0026] like Figure 1-Figure 3 As shown, the present invention provides a distributed distribution network area residual current intelligent monitoring system, comprising:
[0027] The residual current monitoring terminal is used to detect the residual current at the installation location in real time; the residual current monitoring terminal module includes an open-close residual current sensor, a multi-channel AD sampling circuit, a positioning timing circuit, a main control MCU, a wireless communication module, and a power management module;
[0028] The cloud management platform has a built-in data analysis module that can manage all residual current monitoring terminals in the entire region in real time and process and analyze data;
[0029] The current signal is collected through the built-in opening and closing residual current sensor and multi-channel AD sampling circuit of the residual current monitoring terminal and sent to the cloud management platform. The built-in data analysis module of the cloud management platform automatically analyzes the abnormal leakage situation in the substation area, cooperates with the positioning and timing circuit of the residual current monitoring terminal to accurately locate the branch line with abnormal leakage current, and sends alarm prompt text messages to the designated substation management personnel in real time through the wireless communication module of the residual current monitoring terminal.
[0030] Example:
[0031] The present invention takes the need for fault monitoring in a certain area as an example. First, the residual current monitoring terminal is installed at key points such as the main switch, branch switch, secondary branch switch and end-user switch on the low-voltage side of the transformer. Figure 1 The dark circular mark is the installation position of the residual current monitoring terminal. Then the open and close residual current sensor in the residual current monitoring terminal is directly inserted into the circuit for measurement. There is no need to cut off the power during this process. Then, the cloud management platform is used to manage the files of each residual current monitoring terminal and set relevant parameters, such as alarm setting value, monitoring task time, etc. The cloud management platform issues tasks according to the set time, and the residual current monitoring terminal detects the residual current in real time. Once an abnormal mutation occurs, the alarm event is immediately recorded and sent to the cloud management platform. After receiving the data, the cloud management platform synchronously analyzes the real-time values of all residual current monitoring terminals in the substation, displays the real-time situation of the residual current through a graphical interface, accurately judges the key points of leakage, and automatically analyzes the leakage current abnormal branch according to the preset rules, and sends alarm prompt text messages to the designated substation managers in real time, and the managers conduct fault troubleshooting and processing accordingly. During the whole process, the residual current monitoring terminal is provided with continuous power support by lithium batteries. Its waterproof and sealed insulation structure ensures normal operation in various environments. Multiple communication methods ensure stable data transmission, and various components work together to achieve efficient operation of the system.
[0032] The monitoring method of this system can be flexibly adjusted according to actual needs. For example, residual current monitoring can be performed only on one or more branch line points. The number of residual current monitoring terminals can be configured as needed to adapt to different monitoring ranges and scenario requirements. To a certain extent, it can also realize the monitoring and troubleshooting functions of residual current in the substation area.
[0033] The distributed distribution network area residual current intelligent monitoring system of the present invention effectively solves many problems in the prior art through innovative technical means, and has significant technical advancement and practicality.
[0034] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.
Claims
1. A distributed distribution network area residual current intelligent monitoring system, characterized in that: include: The residual current monitoring terminal is used to detect the residual current at the installation location in real time; the residual current monitoring terminal module includes an open-close residual current sensor, a multi-channel AD sampling circuit, a positioning timing circuit, a main control MCU, a wireless communication module, and a power management module; The cloud management platform has a built-in data analysis module that can manage all residual current monitoring terminals in the entire region in real time and process and analyze data; The current signal is collected through the built-in opening and closing residual current sensor and multi-channel AD sampling circuit of the residual current monitoring terminal and sent to the cloud management platform. The built-in data analysis module of the cloud management platform automatically analyzes the abnormal leakage situation in the substation area, cooperates with the positioning and timing circuit of the residual current monitoring terminal to accurately locate the branch line with abnormal leakage current, and sends alarm prompt text messages to the designated substation management personnel in real time through the wireless communication module of the residual current monitoring terminal.
2. The distributed distribution network area residual current intelligent monitoring system according to claim 1 is characterized in that: The cloud management platform has a built-in file management unit, which supports adding or reducing residual current monitoring terminals under the substation, managing the front-end and back-end association relationship of the residual current monitoring terminals, and setting the alarm setting value of the residual current monitoring terminals.
3. The distributed distribution network area residual current intelligent monitoring system according to claim 1 is characterized in that: The cloud management platform issues a fixed task at a set time, and each residual current monitoring terminal performs monitoring at the set time and uploads the recorded value in real time; the cloud management platform collects data from all residual current monitoring terminals in the substation area, and synchronously analyzes the real-time values of all residual current monitoring terminals in the substation area.
4. The distributed distribution network area residual current intelligent monitoring system according to claim 1 is characterized in that: The cloud management platform has built-in user management units, station area management units and terminal management units, which are respectively used to add or delete users, add or delete stations, and add or delete terminals.
5. The distributed distribution network area residual current intelligent monitoring system according to claim 1 is characterized in that: The residual current monitoring terminal has a built-in lithium battery and a lithium battery charging management circuit to meet the power endurance requirements for long-term continuous work.
6. The distributed distribution network area residual current intelligent monitoring system according to claim 1 is characterized in that: The residual current monitoring terminal is equipped with a high-speed sampling module, which is used to sample and record data of leakage characteristic faults and to give an alarm.
7. The distributed distribution network area residual current intelligent monitoring system according to claim 1 is characterized in that: The cloud management platform does not require client program installation, and various function settings and inquiries are performed through web pages.