A configurable multi-type fault positioning and identification method and system in a low-voltage transformer area

Abstract

The application discloses a kind of configurable multi-class fault location identification method and system in low-voltage area, comprising the following steps, according to system communication mode configuration topology identification scheme;Configuration various equipment fault identification code and state;If low-voltage area equipment is communicated by carrier wave mode, then execute carrier wave communication fault location process;If low-voltage area equipment is communicated by non-carrier wave mode, then execute non-carrier wave communication fault location process;If low-voltage area equipment includes carrier wave communication and non-carrier wave mode communication, then execute mixed communication mode fault location process.The system includes intelligent fusion terminal, each level node equipment.The fault location method and system disclosed in the application are applicable to the equipment connected by a variety of other communication modes in addition to the equipment connected by carrier wave communication mode in low-voltage area, and can realize the positioning of multiple types of faults, output the positioning information of the highest layer node, reduce multiple reports and false reports, and shorten the fault point elimination time.

Description

Technical Field

[0001] The present invention relates to the technical field of Internet of Things for electric power equipment, and in particular to a method and system for locating and identifying multiple types of faults that can be configured in a low-voltage substation. Background Art

[0002] With the advancement of society and the vigorous promotion of the power Internet of Things and 5G technology, the complexity and difficulty of laying out the nation's power grid lines are increasing exponentially. Maintaining and repairing power lines and locating faults in the electrical equipment connected to them are becoming increasingly important for grid operation and maintenance. Currently, the technical field of fault location for low-voltage power equipment and lines in substations still primarily relies on manual inspections, with substations responsible for reporting inspections. This results in very slow response to fault repair and rapid response. Furthermore, the identification of equipment and line faults primarily focuses on a few types of faults, such as power outages, and is unable to address the complexities of power applications.

[0003] Chinese invention application number 202010360754.3 discloses a low-voltage distribution network topology identification and fault location device and application method. The method describes installing sensors and identifiers on underlying equipment, using a functional circuit module to apply characteristic pulse currents to the N and PE lines, and using a current loop information receiving module connected to corresponding sensors for analysis and identification. This technical solution only demonstrates that device location can be identified through different characteristic pulse current signals at the electrical level. However, these characteristic pulse current signals are unstable, and without additional devices, topology identification and fault identification are impossible.

[0004] The Chinese invention application with application number 201911018817.0 discloses a low-voltage substation line fault location system based on intelligent circuit breakers. Intelligent circuit breakers are installed at various locations at different levels in the substation, and the ends of each branch line are connected through a connecting switch. Each intelligent circuit breaker is connected to a topology identification device LTU. The topology identification device LTU reads the collected current and voltage information, and performs analysis and calculation to obtain the physical location and hierarchical relationship information of each node, and sends the information to the monitoring center. When a line fault occurs between two levels of intelligent circuit breakers, the circuit breaker at this level, which is set near the fault point, will be tripped and opened first. This technical solution mainly locates faults for equipment equipped with intelligent circuit breakers, focusing on the timed tripping function of controlling the fault point. It has certain limitations and can only carry out fault location work using carrier communication.

[0005] In summary, the existing low-voltage substation fault location technology has the following problems:

[0006] 1) Fault location can only be performed on devices connected via carrier communication, and cannot be performed on devices connected via other communication methods.

[0007] 2) Fault location requires the installation of topology generators and identifiers in the equipment within the low-voltage area, which is costly.

[0008] 3) The fault types located are few, only power outages and other fault types, and the adaptability is not strong;

[0009] 4) In the entire low-voltage substation topology hierarchy, because the equipment nodes in the substation often exist in the form of a tree hierarchy, the failure of the main equipment node may cause problems with the child nodes of this equipment node. Multiple nodes in the substation report multiple similar faults at the same time, and it is impossible to distinguish between the primary and secondary nodes. There are multiple reports and false reports of the same type of faults, which is not conducive to improving operation and inspection efficiency and quickly locating the fault point. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to provide a flexibly configurable low-voltage substation fault location and identification method and system that can be adapted to multiple communication modes, can locate multiple types of faults, can distinguish between primary and secondary nodes for the same type of faults, and reduce multiple and false alarms of fault events in the low-voltage substation.

[0011] To solve the above technical problems, the present invention provides a method for locating and identifying multiple types of faults in a low-voltage substation, comprising the following steps:

[0012] Configure the topology identification solution based on the system communication mode;

[0013] Configure the fault identification code and status of various devices;

[0014] If the equipment in the low-voltage area communicates via carrier communication, the carrier communication fault location process is executed;

[0015] If the equipment in the low-voltage area communicates via a non-carrier communication method, the non-carrier communication fault location process is executed;

[0016] If the equipment in the low-voltage area includes carrier communication and non-carrier communication, the hybrid communication mode fault location process is executed.

[0017] Furthermore, the faults in the step of configuring the fault identification codes and statuses of various devices include power outage faults, residual current pre-warning, residual current alarm, and overload alarm.

[0018] Furthermore, the step of executing the carrier communication fault location process includes the following steps:

[0019] Each node is equipped with a topology generation module and a topology identification module, and the root node is also equipped with a fault location module;

[0020] The fault location module of the root node sends a topology generation command;

[0021] The topology generation module of each node receives the topology generation command and sends a characteristic signal;

[0022] Each node topology identification module identifies the characteristic signal sent by the lower-level topology generation module, generates a characteristic code, returns it to the upper-level node topology identification module, and finally passes it to the root node fault location module to form a topology hierarchy structure generation file;

[0023] The carrier communication management module monitors the fault signals of each node device in the station area and sends them to the fault location module to analyze the fault type and location, and locate the corresponding equipment and line;

[0024] If multiple similar faults are received, find the highest-level node where the similar faults occur.

[0025] Furthermore, the step of executing the non-carrier communication fault location process includes the following steps:

[0026] Configure communication parameters;

[0027] Configure the topology hierarchy to generate files;

[0028] Other communication management modules periodically and proactively query the fault signals of each node equipment in the low-voltage area;

[0029] Other communication management modules send fault signals to the fault location module to analyze the fault type and location, and locate the corresponding equipment and line;

[0030] If multiple similar faults are received, find the highest-level node where the similar faults occur.

[0031] Furthermore, the step of executing the hybrid communication mode fault location process includes the following steps:

[0032] For nodes communicating via carrier communication, a file is generated as a topology hierarchy according to the first four steps of the carrier communication fault location process;

[0033] Add the nodes that communicate via non-carrier communication to the topology hierarchy generated in the previous step to form the final topology hierarchy generated file;

[0034] Wait for each node device in the substation to report a fault;

[0035] The fault location module analyzes the fault type and location and locates the corresponding equipment and line;

[0036] If multiple similar faults are received, find the highest-level node where the similar faults occur.

[0037] Furthermore, the step of finding the highest-level node where the same type of failure occurs includes the following steps:

[0038] After receiving the fault signal, start the timer for the same fault type and set the delay time;

[0039] Within the set delay time, continue to receive several similar fault signals reported by each node device;

[0040] According to the equipment node hierarchy diagram in the substation, find the node where the same type of fault event occurred;

[0041] Start from the leaf node of each branch and search upwards to see if its parent node has a fault.

[0042] If the parent node fails, its address and level are recorded; if the parent node is not faulty, no record is made;

[0043] Repeat the previous step until the root node is found.

[0044] The present invention also provides a system for configurable multiple types of fault location and identification in a low-voltage substation, including an intelligent fusion terminal and node devices at various levels. The node devices at various levels include a main meter, switch-type devices at different levels, a meter box, and electric meters in the meter box. The intelligent fusion terminal and the node devices at various levels are connected in a tree structure with the intelligent fusion terminal as the root node. A fault location module, a topology generation module, a topology identification module, a system configuration module, a carrier management module, and other communication management modules are installed in the intelligent fusion terminal; a topology generation module and a topology identification module are installed in the node devices at various levels; the fault location module in the intelligent fusion terminal is respectively connected to the topology generation module, the topology identification module, the system configuration module, the carrier management module, and other communication management modules; the topology generation module in the intelligent fusion terminal is connected to the topology generation module in the node devices at various levels; and the topology generation module in the node devices at various levels is connected to the topology identification module in the upper-level node devices.

[0045] Furthermore, the fault location module includes a timer for the same fault type.

[0046] Furthermore, the system configuration module includes a network configuration tool module and a general configuration tool module.

[0047] Furthermore, the other communication management modules include a serial port communication management module.

[0048] The beneficial effects of the present invention are as follows: the fault location method and system disclosed in the present invention are not only applicable to equipment connected by carrier communication in a low-voltage substation, but also applicable to equipment connected by various other communication methods. By using a configurable and flexible method, faults of low-voltage equipment of various access types in the substation topology level can be located. At the same time, by configuring the fault type, the fault identification code and status of each device can be flexibly set according to the fault conditions of the equipment in different substations, thereby realizing the location of multiple types of faults. In addition, through statistical analysis of the fault types of concern, a reasonable delay time is set. During this period, the location and fault type of the fault node are reported based on the topological structure analysis, and the positioning information of the highest-level node is output for the fault type, thereby reducing multiple reports and false alarms, shortening the time to eliminate the fault point, and thus improving the efficiency of operation and inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a flow chart of an embodiment of the present invention.

[0050] Figure 2 yes Figure 1 Flowchart of step S103 in FIG.

[0051] Figure 3 yes Figure 1 Flowchart of step S104 in FIG.

[0052] Figure 4 yes Figure 1 Flowchart of step S105 in FIG.

[0053] Figure 5 yes Figures 2 to 4 Find the flowchart of the highest-level node where the same type of failure occurs.

[0054] Figure 6 It is a structural diagram of an embodiment of the present invention.

[0055] Figure 7 yes Figure 6 Internal structure diagram of intelligent fusion terminal 601. DETAILED DESCRIPTION

[0056] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0057] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0058] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0059] like Figure 1 As shown, multiple types of fault location and identification methods can be configured in the low-voltage area, including the following steps:

[0060] Step S101: configuring a topology identification scheme according to the system communication mode.

[0061] Step S102: configure the fault identification codes and status of various devices, including power outage fault, residual current warning, residual current alarm, and overload alarm.

[0062] Step S103: If the devices in the low-voltage area communicate via carrier communication, the carrier communication fault location process is executed:

[0063] like Figure 2 As shown, follow the steps below,

[0064] Step S201: Each node installs a topology generation module and a topology identification module, and the root node also installs a fault location module;

[0065] Step S202: The fault location module of the root node sends a topology generation command;

[0066] Step S203: The topology generation module of each node receives the topology generation command and sends a characteristic signal;

[0067] Step S203: Each node topology identification module identifies the characteristic signal sent by the lower-level topology generation module, generates a characteristic code, returns it to the upper-level node topology identification module, and finally transmits it to the root node fault location module to form a topology hierarchy structure generation file;

[0068] Step S204: The carrier communication management module monitors the fault signals of each node device in the station area and sends them to the fault location module to analyze the fault type and location and locate the corresponding device and line;

[0069] Step S205: If multiple similar faults are received, find the highest-level node where the similar faults occur.

[0070] As a further optimization solution, Figure 6Taking the hierarchical relationship of device nodes in the substation as an example, the resulting topology hierarchy file can be in the following table format:

[0071]

[0072] Step S104: If the equipment in the low-voltage area communicates in a non-carrier mode, the non-carrier communication fault location process is executed:

[0073] like Figure 3 As shown, follow the steps below,

[0074] Step S301, configuring communication parameters;

[0075] Step S302, configuring the topology hierarchy to generate a file;

[0076] Step S303: Other communication management modules periodically and proactively query the fault signals of each node device in the low-voltage area;

[0077] Step S304: Other communication management modules send the fault signal to the fault location module to analyze the fault type and location, and locate the corresponding device and line;

[0078] Step S305: If multiple similar faults are received, find the highest-level node where the similar faults occur.

[0079] Step S105: If the equipment in the low-voltage area includes carrier communication and non-carrier communication, the hybrid communication mode fault location process is executed:

[0080] like Figure 4 As shown, follow the steps below,

[0081] Step S401: For nodes communicating via carrier communication, a topology hierarchy file is generated according to the first four steps of the carrier communication fault location process;

[0082] Step S402, adding the nodes that communicate via non-carrier communication to the topology hierarchy generated in the previous step to form a final topology hierarchy generated file;

[0083] Step S403, waiting for each node device in the substation to report a fault;

[0084] Step S404: The fault location module analyzes the fault type and location and locates the corresponding device and line;

[0085] Step S405: If multiple similar faults are received, find the highest-level node where the similar faults occur.

[0086] The steps of finding the highest level node where the same type of fault occurs in step S206, step S306 and step S405 include the following steps: Figure 5 As shown:

[0087] Step S501: After receiving the fault signal, start the timer for the same fault type and set the delay time;

[0088] Step S502: Continue to receive a number of similar fault signals reported by each node device within a set delay time;

[0089] Step S503: Find the node where the same type of fault event occurs according to the device node hierarchy diagram in the substation area;

[0090] Step S504, starting from the leaf node of each branch, search upwards to see if its parent node has a fault;

[0091] Step S505: If the parent node fails, its address and level are recorded; if the parent node is not faulty, no record is made;

[0092] Step S506: repeat the previous step until the root node is found.

[0093] Below Figure 6 Take the hierarchical relationship of device nodes in the substation as an example to explain how to find the highest-level node of the same type of fault according to the above steps:

[0094] 1) If switch 609 (address 202008200008) and switch 608 (address 202008200009) fail, the topology hierarchy file shows that there are seven branches in the topology. Starting from the leaf node of each branch, that is, the terminal table, search upward to see if its parent node fails.

[0095] 2) If the parent node fails, its address addr and level are recorded; if the parent node does not fail, no record is made;

[0096] For example, if switch 202008200008 fails, addr=202008200008 and level=4 are recorded; if switch 202008200009 fails, addr=202008200009 and level=3 are recorded.

[0097] 3) Repeat 2) until the root node is found.

[0098] In this example, the two nodes do not have the same parent node that fails, so they are nodes at a higher level and report the failure information of both nodes.

[0099] If switch 605 (address 202008200012) also fails, then switch 605 is the parent node of switches 609 and 608, and the same type of event occurs, so only the fault information of switch 605 is reported. If it is a power outage event, then switch 605 has a power outage, and the nodes below must have a power outage. In this way, only the power outage of switch 605 is reported, which is both accurate and reduces the reported fault information.

[0100] like Figure 6 As shown, multiple types of fault location and identification systems can be configured in the low-voltage substation, including an intelligent fusion terminal 601 and node devices at each level. The node devices at each level include a master meter 602, switches 603 to 609, switch 611, meter box 610, meter 613, meter box 614, meter 615, meter 616, meter box 617, meter 618, and meter 619. The intelligent fusion terminal and node devices at each level are connected in a tree structure with the intelligent fusion terminal as the root node. Figure 7 As shown, the intelligent converged terminal is equipped with a fault location module 701, a topology generation module 702, a topology identification module 703, a system configuration module 704, a carrier management module 705, and an other communication management module 706. The fault location module 701 is connected to the topology generation module 702, the topology identification module 703, the system configuration module 704, the carrier management module 705, and the other communication management module 706. Each level of node device is equipped with a topology generation module and a topology identification module. The topology generation module 702 in the intelligent converged terminal is connected to the topology generation modules in the node devices at each level; the topology generation modules in the node devices at each level are connected to the topology identification modules in the node devices at the upper level.

[0101] As a more optimized solution, the fault location module 701 includes a timer for the same fault type.

[0102] As a more optimized solution, the system configuration module includes a network configuration tool module and a general configuration tool module.

[0103] As a more optimized solution, the other communication management modules include a serial port communication management module.

[0104] The embodiments of the present invention can be adjusted, merged, and deleted in sequence according to actual needs.

[0105] The embodiments provide a detailed introduction to the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The above embodiments are only used to help understand the method of the present invention and its core ideas. At the same time, for those skilled in the art, according to the ideas of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A method for locating and identifying multiple types of faults in a low-voltage substation, characterized in that: The following steps are involved: Configure the topology identification solution based on the system communication mode; Configure the fault identification code and status of various equipment in the low-voltage area; If the equipment in the low-voltage area communicates via carrier communication, the carrier communication fault location process is executed; If the equipment in the low-voltage area communicates via a non-carrier communication method, the non-carrier communication fault location process is executed; If the equipment in the low-voltage area includes carrier communication and non-carrier communication, the hybrid communication mode fault location process is executed.

2. The method for locating and identifying multiple types of faults in a low-voltage substation according to claim 1 is characterized in that: The faults in the step of configuring the fault identification codes and statuses of various devices include power outage faults, residual current pre-warning, residual current alarm, and overload alarm.

3. The method for locating and identifying multiple types of faults in a low-voltage substation according to claim 1, characterized in that: The steps of executing the carrier communication fault location process include the following steps: Each node is equipped with a topology generation module and a topology identification module, and the root node is also equipped with a fault location module; The fault location module of the root node sends a topology generation command; The topology generation module of each node receives the topology generation command and sends a characteristic signal; Each node topology identification module identifies the characteristic signal sent by the lower-level topology generation module, generates a characteristic code, returns it to the upper-level node topology identification module, and finally passes it to the root node fault location module to form a topology hierarchy structure generation file; The carrier communication management module monitors the fault signals of each node device in the station area and sends them to the fault location module to analyze the fault type and location, and locate the corresponding equipment and line; If multiple similar faults are received, find the highest-level node where the similar faults occur.

4. The method for locating and identifying multiple types of faults in a low-voltage substation according to claim 1, characterized in that: The steps of performing the non-carrier communication fault location process include the following steps: Configure communication parameters; Configure the topology hierarchy to generate files; Other communication management modules periodically and proactively query the fault signals of each node equipment in the low-voltage area; Other communication management modules send fault signals to the fault location module to analyze the fault type and location, and locate the corresponding equipment and line; If multiple similar faults are received, find the highest-level node where the similar faults occur.

5. The method for locating and identifying multiple types of faults in a low-voltage substation according to claim 1, characterized in that: The steps of executing the hybrid communication mode fault location process include the following steps: For nodes communicating via carrier communication, a file is generated as a topology hierarchy according to the first four steps of the carrier communication fault location process; Add the nodes that communicate via non-carrier communication to the topology hierarchy generated in the previous step to form the final topology hierarchy generated file; Wait for each node device in the substation to report a fault; The fault location module analyzes the fault type and location and locates the corresponding equipment and line; If multiple similar faults are received, find the highest-level node where the similar faults occur.

6. The method for locating and identifying multiple types of faults in a low-voltage substation according to any one of claims 3 to 5, characterized in that: The step of finding the highest-level node where the same type of fault occurs comprises the following steps: After receiving the fault signal, start the timer for the same fault type and set the delay time; Within the set delay time, continue to receive several similar fault signals reported by each node device; According to the equipment node hierarchy diagram in the substation, find the node where the same type of fault event occurred; Start from the leaf node of each branch and search upwards to see if its parent node has a fault. If the parent node fails, its address and level are recorded; if the parent node is not faulty, no record is made; Repeat the previous step until the root node is found.

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