Power-off-free line reconstruction system and method

Abstract

The invention belongs to the technical field of power system relay protection and automation, and particularly relates to a line uninterrupted power transformation system and method. The system comprises a hardware platform which comprises a sampling accessory used for collecting current and voltage signals of a line, and an input / output and operation plug-in; a built-in program of the software platform comprises a protection program module and a communication service process module which are mutually independent; the protection program module is used for executing protection calculation and logic judgment and writing a result into the shared data area; and the communication service process module is used for reading the data from the shared data area according to the configuration file, assembling the data into a standard communication message and uploading the standard communication message. The sampling accessory used for collecting the line current comprises a straight-through current transformer which is used for being clamped and sleeved on an original CT secondary wire to sense proportional current. The sampling accessory used for collecting the line voltage comprises a jack type lead with a protection elastic sheet, and a jack of the jack type lead is used for being clamped on a screw of a PT voltage terminal strip.

Description

Technical Field

[0001] This invention belongs to the field of power system relay protection and automation technology, specifically relating to a line uninterrupted power transmission system and method. Background Technology

[0002] Relay protection devices isolate faults in power systems by issuing warnings or tripping commands, ensuring the safety of the system and primary equipment, and are crucial for the stable operation of power systems. However, the problem of exceeding the service life of existing relay protection devices is becoming increasingly prominent, characterized by high growth rate, high proportion, and high risk. The contradiction between the high reliability requirements of relay protection equipment and the shortage of maintenance personnel and the continuous increase in the number of aging devices is intensifying.

[0003] Traditional methods for upgrading relay protection devices require a power outage and involve steps such as removing the old device, installing the new device, wiring, and debugging, with wiring and debugging being the most time-consuming. With the advancement of new power system construction, a large number of outdated devices need to be replaced, posing significant challenges to traditional power outage-based upgrade methods: 1. Power outage difficulties: Power outages in some low-voltage feeder sections are extremely difficult, resulting in indefinite extension of the renovation cycle and a sharp increase in costs.

[0004] 2. Immense pressure to ensure power supply: Power outage upgrades for single-line power users will directly disrupt their production and daily life, causing significant economic losses and negative social impacts, resulting in extremely low user cooperation.

[0005] 3. Complex multi-department collaboration: It requires coordination among multiple departments and units such as dispatching, operation and maintenance, repair, and users. The power outage window must simultaneously take into account the power grid operation mode and the limited load transfer capacity, making the arrangement extremely difficult.

[0006] 4. Tight power outage time: Users require the power outage time to be minimized, but the renovation involves many stages such as installation, commissioning, and transmission testing, making the project schedule very tight.

[0007] To address these challenges, some experimental uninterruptible power supply (UPS) retrofit solutions have emerged in the industry. However, these existing solutions suffer from fundamental flaws, hindering large-scale application. For example, most existing UPS retrofit solutions are merely simple bypasses to achieve specific protection functions, lacking complete measurement, control, communication, and advanced application functions, and cannot replace the original device as an independent protection unit. Furthermore, they are often temporarily pieced together from multiple scattered single-function devices, resulting in complex systems, cumbersome wiring, and time-consuming and labor-intensive on-site deployment, while introducing new unreliable factors. Alternatively, the protection logic is fixed, unable to be flexibly combined and configured according to changes in actual on-site wiring and operating methods, limiting applicability. There is also a lack of communication compatibility, specifically the lack of interfacing with standard communication protocols such as IEC 61850 widely used in current smart substations, preventing seamless integration with backend monitoring systems and creating information silos.

[0008] Chinese invention patent application publication number CN120914978A discloses an uninterruptible power supply (UPS) replacement system, specifically comprising: a sampling access module: connecting the current sampling circuit of the UPS to the secondary side of the current transformer via an isolation transmitter, and connecting the voltage sampling circuit to the secondary side of the voltage transformer via a high-impedance isolation circuit; a parameter monitoring module: acquiring the phase difference between the temporary current sourced from the old UPS and monitoring the common-mode interference voltage and the rate of change of ambient temperature; a fusion calculation module: calculating the comprehensive protection coefficient; a blocking control module: remotely blocking the old UPS into a logic bypass when the comprehensive protection coefficient stably meets preset conditions; a safety monitoring module: monitoring residual leakage current and changes in the protection coefficient under logic bypass conditions; and a removal execution module: physically removing the old UPS and its wiring when conditions are met. By collecting operating parameters to comprehensively evaluate the protection status, remotely switching the old UPS and continuously monitoring the operating status, the system ensures the safety of the UPS replacement process. Summary of the Invention

[0009] The purpose of this invention is to provide a line uninterrupted power supply retrofit system and method to solve the problems of insufficient communication compatibility and inability to independently implement protection functions in existing line uninterrupted power supply retrofit technologies.

[0010] To achieve the above objectives, the present invention provides a line uninterrupted power supply retrofit system, comprising: The hardware platform includes sampling accessories for acquiring line current and voltage signals, as well as input / output and operation plug-ins; The software platform has built-in programs including independent protection program modules and communication service process modules; The protection program module is used to perform protection calculations and logical judgments, and write the results into the shared data area; The communication service process module is used to read data from the shared data area according to the configuration file and assemble it into a standard communication message for uploading.

[0011] Furthermore, the sampling accessories used to collect line current include a through-hole current transformer, which is used to clamp onto the existing CT secondary conductor to induce proportional current.

[0012] Furthermore, the sampling accessories used to acquire line voltage include a plug-in type wire with a protective spring, the plug of which is used to snap onto the screw of the PT voltage terminal block.

[0013] Furthermore, the system is integrated into a chassis with movable accessories to form an integrated mobile device.

[0014] Furthermore, the configuration file is generated using a graphical configuration tool and is used to describe the mapping relationship between data points and communication protocols.

[0015] Furthermore, the software platform also includes a function library for storing various protection, measurement and control, and auxiliary programs, with the measurement and control programs and auxiliary programs respectively used to implement the corresponding measurement and control and auxiliary functions; the software platform also includes a logic development tool for visual editing and offline simulation of the protection program logic.

[0016] Furthermore, the system includes a front panel and a rear panel; The front panel integrates a human-machine interface, a pressure plate, and a switching handle; The rear panel integrates power terminals, an Ethernet port, a serial port, an air switch, and aviation connectors.

[0017] Furthermore, the line uninterrupted power supply retrofit system also includes various electrical and communication interfaces for compatibility with equipment from different manufacturers or models; The uninterrupted power supply retrofit system also includes a configuration channel for configuring the system's own software.

[0018] The technical solution described above provides a novel live-line retrofit system with the following advantages: Through a communication interface, it can flexibly accommodate different communication networks within the substation (station control layer / process layer), enabling rapid and seamless integration between the live-line retrofit system and the monitoring backend, avoiding information silos and ensuring effective redundant monitoring; Furthermore, through input / output and operation plug-ins, it provides programmable outputs and complete operation loops, allowing the live-line retrofit system to directly execute protection trip / close commands, ensuring it becomes a fully functional independent protection system rather than a simple signal bypass; The decoupling of protection and communication in the software model reconstruction enables plug-and-play communication, allowing for rapid interconnection between the live-line retrofit system and the monitoring backend without modifying core protection programs when facing different substation backend systems at the retrofit site. This significantly shortens the time for redundant system establishment and verification, ensuring the entire live-line retrofit process is efficient and smooth.

[0019] This invention also provides a method for power line modification without power outages, comprising the following steps: Without power interruption, the current and voltage signals of the line are connected to the protection tester, and the protection tester is connected to the original system to form a redundant protection system operating in parallel with the original line protection device. Under the protection of the redundant protection system, the original line protection device is safely deactivated and removed. The new protection device is installed and debugged, during which the protection instrument assumes the protection function; After the new protection device is put into operation, the protection and testing instrument shall be safely deactivated and removed. The protection tester is mainly composed of the following line uninterrupted power modification system, including: a hardware platform, which includes sampling accessories for collecting line current and voltage signals, as well as input / output and operation plug-ins; The software platform has built-in programs including independent protection program modules and communication service process modules; The protection program module is used to perform protection calculations and logical judgments, and write the results into the shared data area; The communication service process module is used to read data from the shared data area according to the configuration file and assemble it into a standard communication message for uploading.

[0020] Furthermore, the sampling accessories used to collect line current include a through-hole current transformer, which is used to clamp onto the existing CT secondary conductor to induce proportional current.

[0021] Furthermore, the sampling accessories used to acquire line voltage include a plug-in type wire with a protective spring, the plug of which is used to snap onto the screw of the PT voltage terminal block.

[0022] Furthermore, the system is integrated into a chassis with movable accessories to form an integrated mobile device.

[0023] Furthermore, the configuration file is generated using a graphical configuration tool and is used to describe the mapping relationship between data points and communication protocols.

[0024] Furthermore, the software platform also includes a function library for storing various protection, measurement and control, and auxiliary programs, with the measurement and control programs and auxiliary programs respectively used to implement the corresponding measurement and control and auxiliary functions; the software platform also includes a logic development tool for visual editing and offline simulation of the protection program logic.

[0025] Furthermore, the system includes a front panel and a rear panel; The front panel integrates a human-machine interface, a pressure plate, and a switching handle; The rear panel integrates power terminals, an Ethernet port, a serial port, an air switch, and aviation connectors.

[0026] Furthermore, the line uninterrupted power supply retrofit system also includes various electrical and communication interfaces for compatibility with equipment from different manufacturers or models; The uninterrupted power supply retrofit system also includes a configuration channel for configuring the system's own software.

[0027] Furthermore, the method of connecting the current and voltage signals of the line to the protection tester is non-invasive sampling, including at least one of the following methods: (1) Current sampling is performed by clamping a through-type current transformer onto the existing CT secondary leads; (2) Use a plug-in type wire with a protective spring clip to connect to the screw on the PT voltage terminal block to bring out the voltage signal.

[0028] The technical solution of the above-mentioned line uninterrupted power supply modification method of the present invention can achieve the same beneficial effects as the above-mentioned line uninterrupted power supply modification system. Attached Figure Description

[0029] Figure 1a This is a flowchart of the communication logic in the traditional mode of the line uninterrupted power supply modification system implementation of the present invention; Figure 1b This is a flowchart illustrating the communication logic implemented by the uninterrupted power supply modification system in the embodiment of the present invention. Figure 2 This is a structural principle illustration of the line uninterrupted power supply modification system in the embodiment of the present invention; Figure 3 This is an example diagram of the installation structure of the through-type current transformer in the embodiment of the power outage modification system of the present invention; Figure 4 This is an example diagram of the installation structure of the plug-in type conductor with protective spring clip in the embodiment of the power outage modification system of the present invention; Figure 5 This is a front view example of a line uninterrupted power-off modification system integrated into a fully enclosed enclosure, as described in the embodiment of the line uninterrupted power-off modification system of the present invention. Figure 6 This is a rear view example of a line uninterrupted power-off modification system integrated into a fully enclosed enclosure, as described in the embodiment of the line uninterrupted power-off modification system of the present invention. Figure 7 This is a flowchart illustrating the uninterrupted power supply modification process implemented using the uninterrupted power supply modification system of the present invention. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0031] Implementation methods for power line uninterruptible retrofit system This embodiment presents a technical solution for a line uninterrupted power supply retrofit system. By processing the communication interface of the core configuration, it enables rapid and seamless connection between the protection tester and the monitoring backend, avoiding the formation of "information silos". Furthermore, through input / output and operation plug-ins, it provides programmable outputs and complete operation loops, enabling the line uninterrupted power supply retrofit system to directly execute protection trip and close commands, becoming a fully functional independent protection device. The software model reconstruction of protection and communication decoupling enables plug-and-play communication.

[0032] The uninterrupted power supply modification system for this line includes: The hardware platform includes sampling accessories for acquiring line current and voltage signals, as well as input / output and operation plug-ins; The software platform has built-in programs including independent protection program modules and communication service process modules; The protection module is used to perform protection calculations and logical judgments, and write the results to the shared data area; The communication service process module is used to read data from the shared data area according to the configuration file and assemble it into standard communication messages for uploading.

[0033] Therefore, through the communication interface, it can flexibly accommodate different communication networks within the station (station control layer / process layer), enabling rapid and seamless integration between the line live-line renovation system and the monitoring backend, avoiding the formation of information silos, and thus ensuring the construction of effective redundant monitoring. Furthermore, by providing outputs and complete operating loops through input / output and operation plug-ins, the line live-line renovation system can directly execute protection trip / close commands, ensuring that the line live-line renovation system becomes a fully functional independent protection system, rather than a simple signal bypass. The decoupling of protection and communication in the software model reconstruction enables plug-and-play communication, allowing for rapid interconnection between the line live-line renovation system and the monitoring backend without modifying the core protection-related programs when facing different substation backend systems at the renovation site. Only the corresponding communication configuration file needs to be replaced or configured, greatly shortening the time for establishing and verifying redundant systems and ensuring the entire live-line renovation process is efficient and smooth.

[0034] Specifically, the configuration file used to describe the mapping relationship between data points and communication protocols is generated through a graphical configuration tool.

[0035] like Figure 1a and Figure 1b As shown, the software architecture of the line uninterrupted power supply retrofit system in this embodiment differs from the traditional model, with the protection program module and the communication service process module decoupled. The protection program writes the calculation results into the shared data area, and the communication service process automatically assembles and sends standard messages (such as IEC61850 format) based on the configuration file (such as an ICD file) generated by the graphical configuration tool.

[0036] Reference Figure 2 Among them, the current sampling accessory (the sampling accessory used to collect line current) adopts a through-type current transformer wire, which is used to clamp onto the secondary conductor of the CT of the original line to induce a proportional current through electromagnetic induction, so that the sampling device can perform current sampling.

[0037] Considering that traditional retrofitting requires disconnecting the CT secondary circuit for series connection, which would cause the circuit protection to temporarily fail, therefore, in this embodiment, if... Figure 3 As shown, a through-type current transformer (also known as a through-type transformer) is used, directly clamped onto the existing CT secondary conductors. Its working principle is electromagnetic induction; the current in the conductor generates magnetic flux in the transformer core, which in turn induces a proportional current in the secondary winding for sampling during relay protection. This process requires no disconnection or alteration of the original wiring, achieving true "bypass current diversion" sampling. This setup is fundamental for uninterrupted current loop sampling, ensuring that the current protection function remains uninterrupted during the connection of the uninterrupted power supply upgrade system and the removal of old protection devices.

[0038] The voltage sampling accessory (a sampling accessory used to collect line voltage) uses a plug-in type wire with a protective spring; the plug of this type of wire is used to snap onto the screw of the line PT voltage terminal block in the absence of power interruption to lead out the voltage signal; the protective spring is used to make tight contact with the screw terminal to prevent loosening or falling off and causing an open circuit or short circuit.

[0039] like Figure 4 As shown, voltage sampling uses a specially designed plug-in wire with a protective spring clip. The plug securely engages with the screws on the terminal block, and the spring clip is designed to ensure tight contact with the screw terminals, preventing loosening or detachment that could cause an open circuit or short circuit. During operation, without interrupting power, the metal plug of the wire is connected in parallel to the screw below the PT voltage terminal block. This design allows for safe and reliable voltage signal extraction without loosening the existing crimp screws or interrupting the original voltage circuit. This design is key to achieving uninterrupted voltage circuit sampling, and together with the current transformer, it ensures that the uninterrupted power supply retrofit system can obtain complete electrical quantity information without affecting the operation of the original protection system. This avoids direct economic losses caused by power outages and improves power supply reliability.

[0040] like Figure 5 and Figure 6 As shown, in a preferred embodiment, the mobile components utilize casters. The uninterrupted power supply retrofit system is integrated into a fully enclosed chassis with casters, facilitating on-site movement and deployment. The fully enclosed chassis conforms to portability standards and is equipped with four casters at the bottom, allowing for flexible movement to the target cabinet.

[0041] It is evident that this design enables the line uninterrupted power-off retrofit system to have a high degree of integration and quick on-site deployment; the integrated design replaces the piecing together of multiple devices, the caster wheel mobile chassis facilitates placement, and the aforementioned standardized communication adaptation method (i.e. the communication service process assembles the read data into a message conforming to the corresponding communication standard format and sends it up) can significantly reduce the workload of on-site debugging.

[0042] Reference Figure 7 The core process of uninterrupted power supply (UPS) retrofitting, as shown, is based on the aforementioned system and key technologies. UPS retrofitting is implemented in five stages, guided by the principle of "parallel redundancy first, then seamless replacement." Taking the case of a UPS system implemented through a monitoring and testing device primarily composed of the UPS system as an example, the details are as follows: 1. Preparation: Complete the configuration, wiring pre-fabrication, and functional testing of the tester offline.

[0043] Specifically, through on-site inspection, the primary wiring and secondary design drawings were verified, the terminal positions that need to be connected to the multi-functional protection tester were marked, and a detailed "Wiring Record Sheet" and "Wire Removal Sequence Sheet" were prepared. Subsequently, in the laboratory, according to the record sheet, the prefabrication, labeling, and insulation treatment of all external connection wires of the protection tester were completed, and a complete functional and transmission test was conducted in a simulated test environment to ensure that the protection tester was in good working order.

[0044] 2. Protection Tester Connection and Verification (Construction of Parallel Redundant System): Using the aforementioned through-core current transformer and wire with socket, connect current and voltage signals safely and without power interruption; connect input, output and communication lines; after debugging, activate the protection function of the protection tester. At this time, the original device and the protection tester form two parallel protection systems, and the line is under double protection.

[0045] In this embodiment, it is confirmed that all output pressure plates of the protection tester are in the deactivated state and the power circuit breaker is disconnected. Using a special tool, the operating circuit of the protection tester is connected in parallel to the corresponding circuit node of the original device on the terminal block, and insulating spacers are installed on both sides of the operating point to ensure safety. The device power supply and operating power supply are connected in sequence, and the power is turned on after the measured voltage is normal. Subsequently, the voltage sampling line of the protection tester is connected in parallel to the PT voltage terminal block using a plug-in type wire with a protective spring; a through-type current transformer is directly clamped onto the secondary wire of the CT for current sampling. The accuracy of the current and voltage sampling values ​​is verified on the protection tester's human-machine interface, the status of all input quantities is checked, and the communication configuration and joint debugging with the station's back-end monitoring system are completed. Finally, the protection function of the protection tester and related output pressure plates are activated, making it a complete redundant protection system that operates in parallel with the original device.

[0046] 3. Removal of old equipment (safe withdrawal under redundant protection): Under the effective protection of the protection device, the old equipment is safely withdrawn and all wiring is disconnected in sequence. At this time, even if the old equipment is completely withdrawn, the line is still protected by the protection device.

[0047] For example, assuming the protection device provides reliable protection, safely perform the old device decommissioning operation. Sequentially decommission and disconnect all outlet hard pressure plates of the old device, and remove its operating power cord. On the current terminal block, short-circuit the CT side circuit as specified, then disconnect the connecting piece, and subsequently disconnect the current cord of the old device. Disconnect the remaining wiring of the old device in sequence, and finally physically remove it from the cabinet rails.

[0048] 4. Installation and commissioning of the new device: Install the new device, restore the wiring, and perform commissioning. During commissioning, the protection function will still be provided by the protection and testing instrument.

[0049] In this embodiment, the new relay protection device is installed in place, and all secondary circuit wiring is restored according to the drawings. After the new device is powered on and performs a self-test, a relay protection tester is used to perform a comprehensive functional verification and output drive test on it. Communication debugging between the new device and the background monitoring system is completed. The permanent connection of the current loop is restored, the output pressure plate of the new device is engaged, and the information source of the background monitoring system is switched to the new device.

[0050] 5. Dismantling and Finalization of the Protective Testing Device: After the new device is put into operation, safely remove and disconnect all temporary wiring of the protective testing device, and restore the site. The modification is now complete, with no power outages throughout the process.

[0051] After confirming that the new device is operating stably, safely deactivate the protection and testing instrument. Deactivate its protection functions in sequence, disconnect the output pressure plate, and then remove all external wiring (including voltage parallel wiring, current transformer, operating circuit parallel wiring, etc.). Remove the temporarily installed insulating spacers, completely restore the terminal block to its original state, and clean up the site.

[0052] Methods and Implementation of Power Supply Transformation for Lines This embodiment provides a technical solution for a method of power line modification without power outages, which includes the following steps: Without power interruption, the current and voltage signals of the line are connected to the protection tester, and the protection tester is connected to the original system to form a redundant protection system that operates in parallel with the original line protection device. Under the protection of the redundant protection system, the original line protection device was safely disconnected and removed. The new protection device was installed and debugged, during which the protection instrument assumed the protection function. After the new protection device is put into operation, the protection and testing equipment should be safely decommissioned and removed. The protection tester is mainly composed of the following circuit uninterrupted power supply modification system, specifically including: The hardware platform includes sampling accessories for acquiring line current and voltage signals, as well as input / output and operation plug-ins; The software platform has built-in programs including independent protection program modules and communication service process modules; The protection module is used to perform protection calculations and logical judgments, and write the results to the shared data area; The communication service process module is used to read data from the shared data area according to the configuration file and assemble it into standard communication messages for uploading.

[0053] Therefore, through the communication interface, it can flexibly accommodate different communication networks within the station (station control layer / process layer), achieving rapid and seamless integration between the line live-line renovation system and the monitoring backend, avoiding the formation of information silos, and thus ensuring the construction of effective redundant monitoring. Furthermore, by providing outputs and complete operating loops through input / output and operation plug-ins, the line live-line renovation system can directly execute protection trip / close commands, ensuring that the line live-line renovation system becomes a fully functional independent protection system, rather than a simple signal bypass. The decoupling of protection and communication in the software model reconstruction enables plug-and-play communication, allowing for rapid interconnection between the line live-line renovation system and the monitoring backend without modifying the core protection-related programs when facing different substation backend systems at the renovation site. Only the corresponding communication configuration file needs to be replaced or configured, greatly shortening the time for establishing and verifying redundant systems and ensuring the entire live-line renovation process is efficient and smooth.

[0054] Specifically, the current and voltage signals of the line are connected to the protection tester in a non-invasive sampling manner, including at least one of the following methods: (1) Current sampling is performed by clamping a through-type current transformer onto the existing CT secondary leads; (2) Use a plug-in type wire with a protective spring clip to connect to the screw on the PT voltage terminal block to bring out the voltage signal.

[0055] Configuration files that describe the mapping relationship between data points and communication protocols are generated using a graphical configuration tool.

[0056] The software architecture of the line uninterrupted power supply retrofit system used in this embodiment differs from the traditional model, with the protection program module and the communication service process module decoupled. The protection program writes the calculation results into the shared data area, and the communication service process automatically assembles and sends standard messages (such as IEC61850 format) based on the configuration file (such as an ICD file) generated by the graphical configuration tool.

[0057] Among them, the current sampling accessory (the sampling accessory used to collect line current) adopts a through-type current transformer wire, which is used to clamp onto the secondary conductor of the CT of the original line to induce a proportional current through electromagnetic induction, so that the sampling device can perform current sampling.

[0058] Considering that traditional upgrades require disconnecting the CT secondary circuit for series connection, which would cause temporary failure of the circuit's protection, this implementation uses a through-type current transformer (also known as a through-type transformer), directly clamped onto the existing CT secondary conductors. Its working principle is electromagnetic induction; the current in the conductor generates magnetic flux in the transformer core, which in turn induces a proportional current in the secondary winding for sampling during relay protection. This process requires no disconnection or alteration of the original wiring, achieving true "bypass current diversion" sampling. This setup is the foundation for uninterrupted current loop sampling, ensuring that the current protection function is never interrupted during the connection of the uninterrupted power supply upgrade system and the removal of the old protection device.

[0059] The voltage sampling accessory (a sampling accessory used to collect line voltage) uses a plug-in type wire with a protective spring; the plug of this plug-in type wire is used to snap onto the screw of the line PT voltage terminal block in the absence of power interruption to lead out the voltage signal; the protective spring is used to make tight contact with the screw terminal to prevent loosening or falling off and causing an open circuit or short circuit.

[0060] Voltage sampling utilizes a specially designed plug-in conductor with a protective spring clip. The plug securely engages with the screws on the terminal block, and the spring clip is designed to ensure tight contact with the screw terminals, preventing loosening or detachment that could cause open or short circuits. During operation, without power interruption, the metal plug of the conductor is connected in parallel to the screw below the PT voltage terminal block. This design allows for safe and reliable voltage signal extraction without loosening the existing crimp screws or interrupting the original voltage circuit. This design is crucial for achieving uninterrupted voltage circuit sampling, and together with the current transformer, it ensures that the uninterrupted power supply retrofit system can acquire complete electrical quantity information without affecting the operation of the original protection system. This avoids direct economic losses caused by power outages and improves power supply reliability.

[0061] In a preferred embodiment, the mobile components utilize casters, and the uninterrupted power supply retrofit system is integrated into a fully enclosed chassis with casters, facilitating on-site movement and deployment. The fully enclosed chassis conforms to portability standards and is equipped with four casters at the bottom, allowing for flexible movement to the target cabinet.

[0062] It is evident that this design enables the line uninterrupted power-off retrofit system to have a high degree of integration and quick on-site deployment; the integrated design replaces the piecing together of multiple devices, the caster wheel mobile chassis facilitates placement, and the aforementioned standardized communication adaptation method (i.e. the communication service process assembles the read data into a message conforming to the corresponding communication standard format and sends it up) can significantly reduce the workload of on-site debugging.

[0063] Based on the aforementioned systems and key technologies, the uninterrupted power supply (UPS) retrofit is implemented in the following five stages. The core guiding principle is "parallel redundancy first, then seamless replacement." Taking the implementation of the UPS system through a monitoring and testing instrument primarily composed of the UPS system as an example, the details are as follows: 1. Preparation: Complete the configuration, wiring pre-fabrication, and functional testing of the tester offline.

[0064] Specifically, through on-site inspection, the primary wiring and secondary design drawings were verified, the terminal positions that need to be connected to the multi-functional protection tester were marked, and a detailed "Wiring Record Sheet" and "Wire Removal Sequence Sheet" were prepared. Subsequently, in the laboratory, according to the record sheet, the prefabrication, labeling, and insulation treatment of all external connection wires of the protection tester were completed, and a complete functional and transmission test was conducted in a simulated test environment to ensure that the protection tester was in good working order.

[0065] 2. Protection Tester Connection and Verification (Construction of Parallel Redundant System): Using the aforementioned through-core current transformer and wire with socket, connect current and voltage signals safely and without power interruption; connect input, output and communication lines; after debugging, activate the protection function of the protection tester. At this time, the original device and the protection tester form two parallel protection systems, and the line is under double protection.

[0066] In this embodiment, it is confirmed that all output pressure plates of the protection tester are in the deactivated state and the power circuit breaker is disconnected. Using a special tool, the operating circuit of the protection tester is connected in parallel to the corresponding circuit node of the original device on the terminal block, and insulating spacers are installed on both sides of the operating point to ensure safety. The device power supply and operating power supply are connected in sequence, and the power is turned on after the measured voltage is normal. Subsequently, the voltage sampling line of the protection tester is connected in parallel to the PT voltage terminal block using a plug-in type wire with a protective spring; a through-type current transformer is directly clamped onto the secondary wire of the CT for current sampling. The accuracy of the current and voltage sampling values ​​is verified on the protection tester's human-machine interface, the status of all input quantities is checked, and the communication configuration and joint debugging with the station's back-end monitoring system are completed. Finally, the protection function of the protection tester and related output pressure plates are activated, making it a complete redundant protection system that operates in parallel with the original device.

[0067] 3. Removal of old equipment (safe withdrawal under redundant protection): Under the effective protection of the protection device, the old equipment is safely withdrawn and all wiring is disconnected in sequence. At this time, even if the old equipment is completely withdrawn, the line is still protected by the protection device.

[0068] For example, assuming the protection device provides reliable protection, safely perform the old device decommissioning operation. Sequentially decommission and disconnect all outlet hard pressure plates of the old device, and remove its operating power cord. On the current terminal block, short-circuit the CT side circuit as specified, then disconnect the connecting piece, and subsequently disconnect the current cord of the old device. Disconnect the remaining wiring of the old device in sequence, and finally physically remove it from the cabinet rails.

[0069] 4. Installation and commissioning of the new device: Install the new device, restore the wiring, and perform commissioning. During commissioning, the protection function is still provided by the protection and testing instrument.

[0070] In this embodiment, the new relay protection device is installed in place, and all secondary circuit wiring is restored according to the drawings. After the new device is powered on and performs a self-test, a relay protection tester is used to perform a comprehensive functional verification and output drive test on it. Communication debugging between the new device and the background monitoring system is completed. The permanent connection of the current loop is restored, the output pressure plate of the new device is engaged, and the information source of the background monitoring system is switched to the new device.

[0071] 5. Dismantling and Finalization of the Protective Testing Device: After the new device is put into operation, safely remove and disconnect all temporary wiring of the protective testing device, and restore the site. The modification is now complete, with no power outages throughout the process.

[0072] After confirming that the new device is operating stably, safely deactivate the protection and testing instrument. Deactivate its protection functions in sequence, disconnect the output pressure plate, and then remove all external wiring (including voltage parallel wiring, current transformer, operating circuit parallel wiring, etc.). Remove the temporarily installed insulating spacers, completely restore the terminal block to its original state, and clean up the site.

[0073] It should be understood that the above-described specific embodiments of the present invention are merely illustrative or explanatory of the principles of the present invention, and do not constitute a limitation thereof.

Claims

1. A power-off line retrofit system, characterized in that, include: The hardware platform includes sampling accessories for acquiring line current and voltage signals, as well as input / output and operation plug-ins; The software platform has built-in programs including independent protection program modules and communication service process modules; The protection program module is used to perform protection calculations and logical judgments, and write the results into the shared data area; The communication service process module is used to read data from the shared data area according to the configuration file and assemble it into a standard communication message for uploading.

2. The line uninterrupted power supply modification system according to claim 1, characterized in that, Sampling accessories used to collect line current include through-hole current transformers, which are used to clamp onto the existing CT secondary conductors to induce proportional current.

3. The line uninterrupted power supply modification system according to claim 1 or 2, characterized in that, Sampling accessories for acquiring line voltage include plug-in wires with protective springs, the plugs of which are used to snap onto screws on the PT voltage terminal block.

4. The line uninterrupted power supply modification system according to claim 1 or 2, characterized in that, The system is integrated into a chassis with movable accessories to form an integrated mobile device.

5. The line uninterrupted power supply modification system according to claim 1 or 2, characterized in that, The configuration file is generated using a graphical configuration tool and is used to describe the mapping relationship between data points and communication protocols.

6. The line uninterrupted power supply modification system according to claim 1 or 2, characterized in that, The software platform also includes a function library for storing various protection, measurement and control and auxiliary programs, with the measurement and control programs and auxiliary programs respectively used to implement the corresponding measurement and control and auxiliary functions; the software platform also includes a logic development tool for visual editing and offline simulation of the protection program logic.

7. The line uninterrupted power supply modification system according to claim 1 or 2, characterized in that, The system has a front panel and a rear panel; The front panel integrates a human-machine interface, a pressure plate, and a switching handle; The rear panel integrates power terminals, an Ethernet port, a serial port, an air switch, and aviation connectors.

8. The line uninterrupted power supply modification system according to claim 1 or 2, characterized in that, The uninterrupted power supply retrofit system also includes various electrical and communication interfaces for compatibility with equipment from different manufacturers or models; The uninterrupted power supply retrofit system also includes a configuration channel for configuring the system's own software.

9. A method for power line modification without interruption, characterized in that, Includes the following steps: Without power interruption, the current and voltage signals of the line are connected to the protection tester, and the protection tester is connected to the original system to form a redundant protection system operating in parallel with the original line protection device. Under the protection of the redundant protection system, the original line protection device is safely deactivated and removed. The new protection device is installed and debugged, during which the protection instrument assumes the protection function; After the new protection device is put into operation, the protection and testing instrument shall be safely deactivated and removed. The protection and testing instrument is mainly composed of the line uninterrupted power supply modification system as described in any one of claims 1-8.

10. The method for power line modification without interruption according to claim 9, characterized in that, The method of connecting the current and voltage signals of the line to the protection tester is a non-invasive sampling method, including at least one of the following methods: (1) Current sampling is performed by clamping a through-type current transformer onto the existing CT secondary leads; (2) Use a plug-in type wire with a protective spring clip to connect to the screw on the PT voltage terminal block to bring out the voltage signal.

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