Power distribution terminal capable of automatically switching protection parameters according to position of 10kV pole-mounted switch

Abstract

The utility model relates to the technical field of power system relay protection, and discloses a power distribution terminal capable of automatically switching protection parameters according to the position of a 10kV pole-mounted switch. The terminal comprises a memory, a microprocessor, a communication interface and an input / output interface. The memory stores multiple sets of protection parameters corresponding to different switch positions; the microprocessor is connected with the memory through a data bus, and can extract corresponding protection parameters according to the switch position signal and execute switching; the communication interface supports remote master station communication, local liquid crystal interaction and PC upper computer software communication; and the input / output interface is used for importing or exporting the protection parameter configuration files in batches. According to the utility model, on-site debugging workload is substantially reduced, high-altitude complex operation is avoided, remote parameter updating is supported, and operation and maintenance efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of power system relay protection technology and discloses a distribution terminal that can automatically switch protection parameters according to the position of a 10kV pole-mounted switch. Background Technology

[0002] In the field of power system relay protection, the topology of 10kV distribution network lines is complex, and they are usually equipped with various types of switching equipment such as outgoing switches, sectionalizing switches, branch switches, boundary switches and tie switches.

[0003] In existing technologies, the protection settings of adjacent switches need to follow the four principles of selectivity, speed, sensitivity, and reliability. Specifically, this means that the protection actions need to be coordinated by gradually increasing current settings and time steps.

[0004] Traditional implementation methods require on-site commissioning personnel to configure parameters independently for each feeder automation terminal. The operation process involves setting more than ten protection parameters, such as overcurrent protection settings, zero-sequence settings, and reclosing parameters, one by one through the terminal's LCD panel in a high-altitude working environment.

[0005] Due to the limited time window for power outages and the harsh working environment, this method suffers from problems such as low commissioning efficiency, susceptibility to errors in manual operation, and significant risks associated with high-risk operations. Furthermore, when the line topology is adjusted or the protection strategy is optimized, repetitive parameter updates are required for all terminals along the line, resulting in high operation and maintenance costs and making it difficult to adapt to the development needs of dynamic reconfiguration in smart grids. Summary of the Invention

[0006] To address the aforementioned technical shortcomings, the purpose of this utility model is to provide a power distribution terminal that can automatically switch protection parameters according to the position of a 10kV pole-mounted switch, thereby solving the problems of low debugging efficiency, high risk of high-altitude operation, and difficulty in updating parameters in the existing technology.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] In a first aspect, this utility model provides a distribution terminal that can automatically switch protection parameters according to the position of a 10kV pole-mounted switch, the terminal comprising:

[0009] The memory stores multiple sets of protection parameters corresponding to different switch positions in the line, including outgoing switches, sectionalizing switches, branch switches, boundary switches, and tie switches.

[0010] The microprocessor is connected to the memory via a data bus and includes a parameter calling unit for extracting protection parameters of the corresponding memory area based on the switch position signal, and an operation switching unit for performing protection parameter switching.

[0011] The communication interface connects to the microprocessor and includes a fiber optic communication interface, a wireless communication module, and an RS485 interface.

[0012] The input / output interface connects to the memory via a configuration bus, allowing for the batch import or export of configuration files containing multiple protection parameters.

[0013] Preferably, in one possible implementation of the first aspect, each set of protection parameters in the memory includes overcurrent protection stage I, stage II, and stage III settings, zero-sequence overcurrent trip and alarm settings, low current grounding protection delay parameters, and configuration parameters for reclosing protection, post-acceleration protection, directional overcurrent protection, and standby automatic transfer protection.

[0014] Preferably, in one possible implementation of the first aspect, the memory is provided with a standardized protection parameter template.

[0015] Preferably, in one possible implementation of the first aspect, the current setting in the zero-sequence overcurrent trip and alarm setting is configured to decrease step by step in the direction from the outgoing switch to the boundary switch.

[0016] Preferably, in one possible implementation of the first aspect, the microprocessor automatically reads the preset switch position protection parameters in the memory during the power-on initialization phase, and monitors the switch position change signal in real time during operation.

[0017] Preferably, in one possible implementation of the first aspect, the microprocessor automatically generates a protection parameter switching event record and uploads it to the remote master station when it detects a change in the switch position.

[0018] Preferably, in one possible implementation of the first aspect, the communication interface supports remote master station communication, local LCD interaction, and PC host computer software communication.

[0019] Preferably, in one possible implementation of the first aspect, the configuration file is in XML file format.

[0020] The beneficial effects of this utility model are as follows: the built-in memory of the terminal can classify and store the protection parameter set corresponding to each node switch of the line, and in conjunction with the parameter calling unit of the microprocessor, realize the dynamic mapping between the switch position signal and the protection parameter, so that the terminal device can automatically load the applicable parameters during the power-on initialization stage and respond to topology changes in real time during operation.

[0021] This significantly reduces on-site commissioning workload. Commissioning personnel can import parameter configurations for all switch positions in batches from the ground via configuration files. During on-site installation, only the switch type needs to be selected to complete parameter deployment, avoiding complex operations in high-altitude environments. The communication interface supports multiple transmission methods including fiber optic, wireless, and RS485. Combined with standardized configuration files in XML format, it ensures the consistency and traceability of parameter configurations for terminal equipment on the same line.

[0022] In summary, this invention saves terminal debugging time, eliminating the need to individually set protection parameters for each terminal on the same line. During on-site installation, it is easy to operate, requiring no complex configuration and offering flexibility. If the system needs upgrading, protection parameters can be remotely downloaded from the main station, facilitating operation and maintenance. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This application provides a schematic diagram of the structure of a distribution terminal that can automatically switch protection parameters according to the position of a 10kV pole-mounted switch.

[0025] Figure 2 This application provides a topology diagram of a 10kV three-section, three-connection line.

[0026] Figure 3 A flowchart of the power-on switching protection operation parameters of the feeder automation terminal device is provided for this application.

[0027] Figure 4 This application provides a flowchart of the process for setting the protection settings of switches at different locations on the line using a PC tool.

[0028] Figure 5 This application provides a flowchart for quickly configuring the switch protection settings at different locations of the terminal.

[0029] Figure 6 A flowchart illustrating the process of changing switch position parameters is provided for this application. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0031] Example 1: As Figure 1 As shown, this utility model provides a power distribution terminal that can automatically switch protection parameters according to the position of a 10kV pole-mounted switch. The terminal includes a memory, a microprocessor, a communication interface, and an input / output interface.

[0032] like Figure 2 As shown, this embodiment uses a 10kV three-section, three-connection line as the application scenario to specifically illustrate the implementation method and workflow of this power distribution terminal.

[0033] The memory stores standardized protection parameters and templates corresponding to various types of switches in the line topology, specifically including protection parameters for outgoing switch CB1, sectionalizing switches FB1 / FB2, branch switches FS1, boundary switches YS1, and tie switches LS1. Each set of protection parameters includes overcurrent protection stage I, II, and III settings, zero-sequence overcurrent tripping and alarm settings, low-current grounding protection delay parameters, and configuration parameters for reclosing protection, post-acceleration protection, directional overcurrent protection, and automatic transfer switch protection.

[0034] The microprocessor connects to the memory via a data bus and integrates a parameter calling unit and a running switching unit. The parameter calling unit continuously receives position encoding signals from the switch body and quickly locates the corresponding protection parameter storage area in the memory using preset address mapping rules. The running switching unit is responsible for the complete parameter switching process: upon receiving a position confirmation command, it first verifies the validity of the target parameters; if correct, it executes the parameter loading operation. During the terminal power-on initialization phase, the microprocessor automatically loads the preset default protection parameter group in the memory and simultaneously establishes a communication link with the SCADA system to obtain real-time topology information. During operation, the processor monitors the switch mechanical position signal and the SCADA system topology status signal in real time; when the two signals are consistent, the parameter switching process is initiated. After each parameter switching is completed, the system automatically generates a complete event record containing elements such as switching time, original parameter version, and new parameter identifier, and uploads encrypted data packets to the remote master station maintenance platform via a standard communication protocol.

[0035] The communication interface connects to the microprocessor and includes three independent channels: the fiber optic communication interface supports data interaction with the dispatch master station, the wireless communication module has a built-in 4G chipset for remote maintenance command transmission, and the RS485 interface connects to the local LCD operation panel.

[0036] The input / output interface is configured with a USB transmission port, which can be connected to the maintenance personnel's PC via cable. It can import and export XML format configuration files in batches, which fully contain the protection parameters of all switch types of the line.

[0037] To ensure reliable coordination of the switches, the protection settings for the outgoing line switch I are configured to ensure that the protection range of the I section does not exceed the first-end sectionalizing switch FB1. In this embodiment, the conventional protection and logic function configurations of each switch on the line are shown in Table 1.

[0038] Table 1. Configuration of Conventional Protection Functions for Switches at Different Locations

[0039]

[0040] Figure 3 The diagram illustrates the power-on switching of protection operation parameters for the feeder automation terminal unit. During the power-on initialization phase, the microprocessor automatically reads the switch position parameters from the memory. During operation, it continuously monitors the mechanical position signals from the switch body and the topology signals from the SCADA system. When a change in switch position is detected, the parameter calling unit immediately locks the current operating parameter set, completes the verification and switching of the new parameter set, and uploads the event log to the master station via the fiber optic channel.

[0041] The commissioning personnel first pre-configured the parameters of the first terminal using a PC maintenance tool. The workflow for setting the protection settings for switches at different locations on the line using the PC tool is as follows: Figure 4 As shown, first open the PC maintenance tool, establish a communication connection, set the protection parameters for all switch positions in sequence, and export them as an XML file.

[0042] During normal operation, the terminal supports the reading and modification of protection parameters by the remote control master station, local LCD module, and PC host computer software. Figure 5 The diagram illustrates the workflow for quickly configuring switch protection settings at different locations on the terminal. Each terminal automatically verifies the integrity of the configuration file upon receiving it and matches it with the terminal's hardware version number to ensure parameter compatibility.

[0043] During the on-site installation phase, Figure 6 The diagram shows the workflow for changing switch position parameters. Operators can modify the terminal's "switch position" through the "position selection" menu on the local LCD panel, switching the terminal's protection settings to the corresponding settings.

[0044] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A distribution terminal capable of automatically switching protection parameters based on the position of a 10kV pole-mounted switch, characterized in that, The terminal includes: The memory stores multiple sets of protection parameters corresponding to different switch positions in the line, including outgoing switches, sectionalizing switches, branch switches, boundary switches, and tie switches. The microprocessor is connected to the memory via a data bus and includes a parameter calling unit for extracting protection parameters of the corresponding memory area based on the switch position signal, and an operation switching unit for performing protection parameter switching. The communication interface connects to the microprocessor and includes a fiber optic communication interface, a wireless communication module, and an RS485 interface. The input / output interface connects to the memory via a configuration bus, allowing for the batch import or export of configuration files containing multiple protection parameters.

2. A distribution terminal that can automatically switch protection parameters according to the position of a 10kV pole-mounted switch as described in claim 1, characterized in that, Each set of protection parameters in the memory includes overcurrent protection stage I, II, and III settings, zero-sequence overcurrent trip and alarm settings, low-current grounding protection delay parameters, and configuration parameters for reclosing protection, post-acceleration protection, directional overcurrent protection, and automatic transfer protection.

3. A distribution terminal that can automatically switch protection parameters according to the position of a 10kV pole-mounted switch as described in claim 2, characterized in that, The memory contains standardized protection parameter templates.

4. A distribution terminal that can automatically switch protection parameters according to the position of a 10kV pole-mounted switch as described in claim 2, characterized in that, The current setting in the zero-sequence overcurrent trip and alarm settings is configured to decrease step by step from the outgoing switch to the boundary switch.

5. A distribution terminal that can automatically switch protection parameters according to the position of a 10kV pole-mounted switch as described in claim 1, characterized in that, During the power-on initialization phase, the microprocessor automatically reads the preset switch position protection parameters in the memory and monitors the switch position change signals in real time during operation.

6. A distribution terminal capable of automatically switching protection parameters according to the position of a 10kV pole-mounted switch as described in claim 5, characterized in that, When the microprocessor detects a change in the switch position, it automatically generates a protection parameter switching event record and uploads it to the remote master station.

7. A distribution terminal that can automatically switch protection parameters according to the position of a 10kV pole-mounted switch as described in claim 1, characterized in that, The communication interface supports remote master station communication, local LCD interaction, and PC host computer software communication.

8. A distribution terminal that can automatically switch protection parameters according to the position of a 10kV pole-mounted switch as described in claim 1, characterized in that, The configuration file is in XML file format.

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