Self-healing voltage transformer designed for primary fuse fusing

Abstract

The invention relates to the technical field of power system equipment, in particular to a self-healing voltage transformer designed for primary fuse fusing, which comprises a voltage transformer body used for measuring voltage in a power system; the fuse switching device is used for automatically switching to the standby fuse when the primary fuse is fused; the state detection device is used for monitoring the state of each primary insurance in real time and sending state information to the control module; and the control module is used for receiving a signal of the state detection device, judging the insurance state and controlling the insurance switching device to switch. According to the invention, automatic monitoring and switching of insurance are realized, the fault processing time is shortened, and the risk of manual operation is reduced; remote monitoring and intelligent alarm are supported, the operation and maintenance efficiency is improved, and stable operation of a power grid can be guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of power system equipment, and is a self-healing voltage transformer designed for primary fuse fusing. Background Art

[0002] In power systems, voltage transformers (VTs) are core measurement and protection devices, and their stable and reliable operation is directly related to the safety of the power grid. However, traditional VTs face many challenges in actual operation.

[0003] On the one hand, the complex operating environment of the power grid, with factors such as voltage fluctuations, prolonged high voltage conditions, and the natural aging of equipment, often cause the primary fuse of the voltage transformer to blow. Once the primary fuse blows, the protective device will not function properly, significantly increasing the risk of grid operation and potentially triggering the misoperation of protective safety devices, leading to large-scale power outages and seriously threatening the stability and reliability of power supply.

[0004] On the other hand, the handling process for traditional voltage transformers after a blown fuse is extremely cumbersome. From preparing materials and spare parts, applying for safety tools, processing emergency repair tickets, recording risk control, waiting for operators to gather with on-site personnel, holding pre-shift meetings, and actually carrying out replacement operations, the entire process involves multiple links and departmental coordination. According to statistics, a single fuse replacement operation usually takes 1-3 hours, and on-site operations are somewhat dangerous, requiring extremely high professional skills and safety protection from operators and maintenance personnel. This not only significantly increases the cost of grid operation and maintenance, but also affects the continuous power supply of the grid due to long-term power outages, making it difficult to meet the urgent needs of modern power systems for high reliability and high efficiency. Summary of the Invention

[0005] The present invention provides a self-healing voltage transformer designed for primary fuse blowing, which overcomes the shortcomings of the above-mentioned existing technologies. It can effectively solve the problem that manual replacement of the primary fuse of traditional voltage transformers after melting is time-consuming and dangerous, affecting the stability and reliability of the power grid.

[0006] The technical solution of the present invention is achieved through the following measures: a self-healing voltage transformer designed for primary fuse fusing, comprising: Voltage transformer body, used to measure voltage in power system; A fuse switching device is used to automatically switch to the backup fuse when the primary fuse blows; Status detection device, used to monitor the status of each primary fuse in real time and send status information to the control module; A control module is used to receive signals from a status detection device, determine the fuse status, and control the switching of a fuse switching device; Among them, the status detection device is electrically connected to the insurance switching device to monitor the primary insurance status, and the status detection device is electrically connected to the control module to send the monitored primary insurance status information to the control module; the control module is electrically connected to the insurance switching device to control the insurance switching device to perform insurance switching operations according to the received status information.

[0007] The following are further optimizations and / or improvements to the above technical solutions: It may also include an alarm device, which is electrically connected to the control module and is used to receive signals from the control module and issue an alarm.

[0008] It may also include a communication module, which is electrically connected to the control module and is used to monitor information interaction between personnel and the control module.

[0009] The above-mentioned fuse switching device may include multiple primary fuses and a fuse switching mechanism. The multiple primary fuses are electrically connected to the fuse switching mechanism, and the fuse switching mechanism is also electrically connected to the control module; the fuse switching mechanism is used to receive the control signal sent by the control module, and drive the corresponding components to operate according to the control signal, so as to isolate the primary fuse that has blown from the circuit and connect the spare primary fuse to the circuit to complete the automatic switching operation of the fuse.

[0010] The above status information may include the time when a primary fuse blows, the voltage condition when it blows, and the number of remaining primary fuses.

[0011] The above-mentioned control module may include a microprocessor, a signal receiving circuit, and a signal output circuit; the signal receiving circuit is electrically connected to the status detection device, and is used to receive the status information sent by the status detection device and transmit it to the microprocessor; the microprocessor is electrically connected to the signal receiving circuit and the signal output circuit respectively, analyzes and processes the received status information, and generates a control signal based on the processing results; the signal output circuit is electrically connected to the safety switching device, the alarm device, and the communication module, and sends the control signal generated by the microprocessor to the corresponding device.

[0012] A storage module may also be included, the storage module being electrically connected to the status detection device and the control module respectively, and being used to store status information.

[0013] It may also include an intelligent terminal, which is electrically connected to the control module and is used to provide monitoring personnel with operating instructions and receive alarm information.

[0014] The above-mentioned intelligent terminal can be at least one of a substation background monitoring system, a DCS and a mobile phone.

[0015] The above-mentioned alarm device can have a multi-level alarm mode, and emit sound and light warnings of different frequencies according to the severity of the primary fuse melting.

[0016] Through automatic monitoring, fuse switching, and intelligent alarm functions, this invention significantly shortens fuse replacement time, reduces manual operation risks, improves operation and maintenance efficiency, ensures stable and reliable power grid operation, and reduces operation and maintenance costs. When a fuse blows, it automatically switches to a backup fuse without manual intervention, effectively avoiding prolonged power outages caused by fuse blows and ensuring continuous and stable power supply to the power system. A status detection device monitors fuse status in real time, and the control module quickly determines and executes the switch, shortening the fault duration and reducing the risk of malfunctioning protective devices and power outages caused by fuse blows. A communication module and intelligent terminal enable remote monitoring and operation, and a multi-level alarm mode allows operators to quickly assess fault severity and prioritize handling, significantly improving operation and maintenance efficiency while reducing on-site work time and manpower. A storage module stores status information, providing data support for fault analysis, equipment maintenance, and performance optimization, facilitating the development of more scientific and reasonable operation and maintenance strategies and extending equipment life. This reduces the frequency of manual on-site fuse replacement, reduces operational risks, and lowers operation and maintenance costs. Furthermore, automatic switching and intelligent management improve overall equipment reliability and minimize economic losses caused by failures. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attachment Figure 1 Schematic diagram of the overall structure of an embodiment of the present invention.

[0018] Attachment Figure 2 Schematic diagram of the working process of an embodiment of the present invention.

[0019] The codes in the accompanying drawings are: 1 is the primary fuse of the voltage transformer, 2 is the voltage transformer body, and 3 is the voltage transformer auxiliary body. DETAILED DESCRIPTION

[0020] The present invention is not limited to the following embodiments, and specific implementation methods can be determined based on the technical solutions of the present invention and actual conditions.

[0021] The present invention will be further described below in conjunction with the embodiments: Example 1: As shown in the attached Figure 1 、 2 As shown in FIG, the self-healing voltage transformer designed for primary fuse fusing includes: The voltage transformer body is used to measure the voltage in the power system. It integrates and fixes each module to realize normal voltage acquisition and measurement functions.

[0022] A fuse switching device is used to automatically switch to the backup fuse when the primary fuse blows; Status detection device, used to monitor the status of each primary fuse in real time and send status information to the control module; A control module is used to receive signals from a status detection device, determine the fuse status, and control the switching of a fuse switching device; Among them, the status detection device is electrically connected to the insurance switching device to monitor the primary insurance status, and the status detection device is electrically connected to the control module to send the monitored primary insurance status information to the control module; the control module is electrically connected to the insurance switching device to control the insurance switching device to perform insurance switching operations according to the received status information.

[0023] The voltage transformer itself monitors the power system voltage in real time, while the status detection device continuously monitors the status of the primary fuse and transmits this information to the control module. The control module determines whether the fuse has blown based on this status information. If so, it sends a command to the fuse switching device to switch to the backup fuse. This allows for automatic switching after the voltage transformer's primary fuse blows, reducing manual intervention, improving the continuity and stability of power system operations, and lowering the risk of power outages caused by fuse blown. This effectively ensures the stability of power supply, lowers operation and maintenance costs, and improves the overall reliability of the power system.

[0024] The present invention also includes an alarm device, which is electrically connected to the control module and is used to receive signals from the control module and issue an alarm. When the control module determines that a primary fuse is in an abnormal state such as a blown fuse, it sends a signal to the alarm device, and the alarm device issues an alarm through sound and light. This can promptly remind staff of abnormal conditions of the voltage transformer, facilitate rapid response and handling of faults, avoid the expansion of faults, improve operation and maintenance efficiency, allow operation and maintenance personnel to grasp equipment abnormalities at the first time, shorten fault handling time, and reduce the impact of faults on the power system. In the present invention, the insurance switching device, status detection device, alarm device, communication module, and control module are installed on the voltage transformer sub-body.

[0025] The present invention also includes a communication module, electrically connected to the control module, for information exchange between monitoring personnel and the control module. The control module transmits information such as the voltage transformer's operating status and fuse status to monitoring personnel via the communication module. Simultaneously, it receives and executes operational instructions sent by the monitoring personnel via the communication module. This enables remote monitoring and operation, transcending geographical restrictions and allowing operators to promptly monitor equipment operating conditions. This enhances the level of intelligent equipment management, enabling operators to monitor and operate equipment without having to visit the site, improving management efficiency and enabling intelligent operation and maintenance.

[0026] In the present invention, a fuse switching device includes multiple primary fuses and a fuse switching mechanism. Each of the multiple primary fuses is electrically connected to the fuse switching mechanism, which is also electrically connected to a control module. The fuse switching mechanism is configured to receive control signals from the control module and, based on the control signals, actuate corresponding components to isolate the blown primary fuse from the circuit and connect a backup primary fuse to the circuit, completing the automatic fuse switching operation. The fuse switching mechanism, receiving instructions from the control module, actuates internal components to disconnect the blown fuse circuit and connect the backup fuse, restoring normal circuit operation. This approach improves the reliability and fault tolerance of fuse switching, enhances the voltage transformer's ability to cope with fuse blown faults, and enables rapid switching when a fuse blows, reducing the impact of the fault on the power system and ensuring safe and stable operation of the equipment. In the present invention, the fuse switching mechanism primarily comprises a switching drive assembly, a contact switching assembly, a mechanical transmission assembly, and a housing protection assembly. The switching drive assembly employs an electromagnetic drive structure, consisting of an electromagnet, an armature, and a return spring. The electromagnet is connected to the signal output circuit of the control module via a wire, and the armature is displaced by the magnetic force of the electromagnet. The contact switching assembly contains multiple static contacts and one moving contact. Each static contact corresponds to a primary fuse. The moving contact is connected to the armature through a mechanical transmission assembly and can contact different static contacts under the drive of the armature. The mechanical transmission assembly consists of a connecting rod and a guide rail to ensure that the moving contact moves smoothly and is accurately positioned during the switching process. The outer shell protection assembly uses insulating flame-retardant materials to protect the internal components and prevent dust, moisture, etc. from affecting the normal operation of the mechanism. After the insurance switching mechanism receives the control signal from the control module, the electromagnet is energized to generate magnetic force to attract the armature, and the armature drives the mechanical transmission assembly to operate, so that the moving contact is separated from the static contact corresponding to the primary fuse that has blown, and at the same time connected with the static contact corresponding to the spare primary fuse, realizing the isolation of the fault fuse and the access of the spare fuse. The rated operating voltage of the electromagnet is DC24V, and the suction force is not less than 10N, ensuring that it can reliably drive the armature movement; the contact resistance of the moving and static contacts of the contact switching component is no more than 50mΩ, which can stably transmit current; the action time of the mechanical transmission component does not exceed 50ms, ensuring the timely switching of the fuse; the shell protection level reaches IP54, which is effectively dust-proof and waterproof, and adapts to the operating environment of the power system.

[0027] In this invention, status information includes the time a primary fuse blows, the voltage at the time of blow, and the number of remaining primary fuses. The status detection device collects data such as the time a primary fuse blows, the voltage at the moment of blow, and the number of available fuses in real time and transmits it to the control module. This provides rich data support for fault analysis, allowing personnel to understand the specific circumstances of the fault and the current status of the equipment, develop targeted repair and maintenance strategies, and more comprehensively analyze the cause of the fault, optimize equipment maintenance plans, and improve equipment performance.

[0028] In the present invention, the control module includes a microprocessor, a signal receiving circuit, and a signal output circuit. The signal receiving circuit is electrically connected to a status detection device and receives status information from the status detection device and transmits it to the microprocessor. The microprocessor is electrically connected to the signal receiving circuit and signal output circuit, analyzes and processes the received status information, and generates control signals based on the processing results. The signal output circuit is electrically connected to a safety switching device, an alarm device, and a communication module, and transmits the control signals generated by the microprocessor to the corresponding devices. The signal receiving circuit acquires status information and transmits it to the microprocessor. After analysis, the microprocessor sends instructions to each device via the signal output circuit, thereby achieving control of the voltage transformer and information exchange. This clarifies the internal structure and workflow of the control module, ensures accurate signal reception, processing, and transmission, ensures coordinated operation of various functional components, improves system stability and reliability, enables coordinated operation of various system components, reduces errors in signal transmission and processing, and improves overall device performance. The control module is internally provided with a timing unit for setting the delay time of the alarm signal to avoid wasting operation and maintenance resources due to false alarms. An operation unit is also provided for receiving instructions from operation and maintenance personnel and remotely operating or configuring the device. The design of the control module should ensure smooth communication and data synchronization between each unit module to achieve comprehensive monitoring and management of the voltage transformer. At the same time, the control module should also have a fault self-diagnosis function, which can promptly detect and handle system faults and ensure stable operation of the equipment. However, this requires manual double confirmation by the monitoring personnel. Through comprehensive analysis and judgment of systems such as Open3000 and D5000, the personnel must confirm that the primary fuse has burned out. The self-healing voltage transformer control is allowed to execute the disconnection of the PT primary side disconnector (or circuit breaker) to ensure complete isolation from the live busbar, and to exit the relevant protection devices, disconnect the PT secondary side fuse or air switch, and prevent reverse power supply and other safety measures. After confirming safety, the insurance switching device is switched and the alarm device is triggered to send an alarm signal.

[0029] In actual applications, once the primary fuse of the voltage transformer is blown due to aging, abnormal voltage, etc., the voltage transformer body on site measures abnormal voltage of a phase of the voltage transformer, and the status detection device module detects that the status of the fuse is abnormal, and monitors and stores the information such as the time when the primary fuse is blown, the voltage condition when the fuse is blown, and the number of remaining primary fuses in real time, and sends it to the alarm device. The alarm device sends an alarm to the station operation and maintenance personnel through sound and light alarms to inform them of the fuse blown condition, and the control module sends information to the telecontrol device through the communication module, and sends the voltage transformer operation data, such as voltage condition, fuse blown time, and the number of blown fuses to the telecontrol device, which then sends it to the monitoring background through the telecontrol device to alert the monitoring personnel, who will then After confirming that the fuse has blown and the voltage transformer is not in operating condition, the communication module sends an instruction to the control module to allow the replacement of the voltage transformer fuse. The control module then automatically disconnects the PT primary side disconnector (or circuit breaker) to ensure complete isolation from the live bus, exits the relevant protection devices, disconnects the PT secondary side fuse or air switch, and prevents reverse power supply and other safety measures. After confirming safety, the insurance switching device is controlled to switch, switching the faulty primary insurance to a healthy insurance. After the switch is completed and the self-inspection is normal, the voltage transformer is restored to operation, realizing the self-healing function of the voltage transformer. The entire process does not require the participation of on-site operation and maintenance personnel, saving a lot of personnel operation and maintenance costs while ensuring the safety of personnel and equipment. Manual replacement of a voltage transformer requires the preparation of spare parts, application for safety tools, issuance of emergency repair tickets, recording of risk control, waiting for operators to arrive, waiting for on-the-job personnel to arrive, pre-shift meetings, and then actually starting the replacement. The entire process is complicated and time-consuming, generally taking 1-3 hours, and has certain operational risks. Self-healing voltage transformers, on the other hand, ensure safety through automatic machine identification and manual double confirmation, which can greatly reduce the time required for fuse replacement and is expected to be completed within 5-15 minutes, greatly improving work efficiency and safety.

[0030] This invention aims to address the problem of primary fuses in traditional voltage transformers (VTs) blowing due to factors such as voltage fluctuations and aging, ensuring the proper functioning of power grid equipment and reducing operational and maintenance pressures. By configuring multiple primary fuses and enabling real-time monitoring of their status, this system automatically switches to a functioning fuse in the event of a fuse failure, ensuring the proper functioning of the VT. Furthermore, it features in-station audible and visual alarms, as well as telecontrol alarms, enabling timely detection and resolution of fuse failures, reducing operational and maintenance pressures.

[0031] Example 2: As shown in the attached Figure 1 、 2As shown, this self-healing voltage transformer designed for primary fuse failure also includes a storage module, electrically connected to the status detection device and control module, for storing status information. The status detection device and control module store the collected and processed status information in the storage module for subsequent query and analysis. This enables long-term storage of status information, providing a data foundation for equipment operating status analysis, fault tracing, and performance optimization. It also provides data support for the full lifecycle management of the equipment and helps optimize equipment operation and maintenance strategies.

[0032] Example 3: As shown in the attached Figure 1 、 2 As shown, the self-healing voltage transformer designed for primary fuse blown also includes an intelligent terminal, which is electrically connected to the control module and is used to send operating instructions and receive alarm information to monitoring personnel. The monitoring personnel sends operating instructions to the control module via the intelligent terminal, and the control module feeds alarm information back to the intelligent terminal for display. This further expands the human-computer interaction method, allowing monitoring personnel to more conveniently operate and monitor the voltage transformer, improving the convenience of equipment management, increasing the efficiency of human-computer interaction, making it easier for monitoring personnel to manage equipment, and reducing operational difficulty. The intelligent terminal is at least one of the substation backend monitoring system, DCS, and mobile phone. Different types of intelligent terminals communicate with the control module via an electrical connection to enable the exchange of instructions and information. This provides a variety of intelligent terminal options to meet the needs of different scenarios and users, enhancing the system's applicability and flexibility, making the system adaptable to different usage environments and user needs, and expanding the system's application range.

[0033] Example 4: As shown in the attached Figure 1 、 2 As shown, the alarm device for this self-healing voltage transformer, designed for primary fuse blown, features a multi-level alarm mode, emitting audible and visual warnings of varying frequencies depending on the severity of the primary fuse blown. The control module sends a corresponding signal to the alarm device based on the severity of the primary fuse blown, which then issues warnings in the form of audible and visual signals of varying frequencies. This hierarchical alarm system allows personnel to quickly determine fault severity, prioritize handling, and improve fault handling efficiency. This allows operators to more intuitively understand fault severity, prioritize emergency handling, and enhance overall maintenance efficiency.

[0034] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the requirements of different situations.

Claims

1. A self-healing voltage transformer designed for primary fuse blowing, characterized by include: Voltage transformer body, used to measure voltage in power system; A fuse switching device is used to automatically switch to the backup fuse when the primary fuse blows; Status detection device, used to monitor the status of each primary fuse in real time and send status information to the control module; A control module is used to receive signals from a status detection device, determine the fuse status, and control the switching of a fuse switching device; Among them, the status detection device is electrically connected to the insurance switching device to monitor the primary insurance status, and the status detection device is electrically connected to the control module to send the monitored primary insurance status information to the control module; the control module is electrically connected to the insurance switching device to control the insurance switching device to perform insurance switching operations according to the received status information.

2. The self-healing voltage transformer designed for primary fuse blowing according to claim 1 is characterized in that It also includes an alarm device, which is electrically connected to the control module and is used to receive signals from the control module and issue an alarm.

3. The self-healing voltage transformer designed for primary fuse blowing according to claim 1 or 2, characterized in that It also includes a communication module, which is electrically connected to the control module and is used to monitor information interaction between personnel and the control module.

4. The self-healing voltage transformer designed for primary fuse blowing according to claim 1 or 2, characterized in that The fuse switching device includes multiple primary fuses and a fuse switching mechanism. The multiple primary fuses are electrically connected to the fuse switching mechanism, and the fuse switching mechanism is also electrically connected to the control module; the fuse switching mechanism is used to receive the control signal sent by the control module, and drive the corresponding components to operate according to the control signal, so as to isolate the primary fuse that has blown from the circuit and connect the spare primary fuse to the circuit to complete the automatic switching operation of the fuse.

5. The self-healing voltage transformer designed for primary fuse blowing according to claim 1 or 2, characterized in that The status information includes the time when the primary fuse blows, the voltage condition when it blows, and the number of remaining primary fuses.

6. The self-healing voltage transformer designed for primary fuse blowing according to claim 1 or 2, characterized in that The control module includes a microprocessor, a signal receiving circuit, and a signal output circuit; the signal receiving circuit is electrically connected to the status detection device, and is used to receive status information sent by the status detection device and transmit it to the microprocessor; the microprocessor is electrically connected to the signal receiving circuit and the signal output circuit respectively, analyzes and processes the received status information, and generates a control signal based on the processing results; the signal output circuit is electrically connected to the safety switching device, the alarm device, and the communication module, and sends the control signal generated by the microprocessor to the corresponding device.

7. The self-healing voltage transformer designed for primary fuse blowing according to claim 1 or 2, characterized in that It also includes a storage module, which is electrically connected to the status detection device and the control module respectively and is used to store status information.

8. The self-healing voltage transformer designed for primary fuse blowing according to claim 1 or 2, characterized in that It also includes an intelligent terminal, which is electrically connected to the control module and is used to provide monitoring personnel with operating instructions and receive alarm information.

9. The self-healing voltage transformer designed for primary fuse blowing according to claim 8, characterized in that The intelligent terminal is at least one of a substation background monitoring system, a DCS and a mobile phone.

10. The self-healing voltage transformer designed for primary fuse blowing according to claim 2, characterized in that The alarm device has a multi-level alarm mode, which emits sound and light warnings of different frequencies according to the severity of the primary fuse melting.

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