All-working-condition protection system of large-current switch equipment

Abstract

The invention provides an all-condition protection system for large-current switch equipment, which comprises an intelligent interlocking protection module and a dynamic insulation control module, and is characterized in that the intelligent interlocking protection module automatically disables opening and closing operation and starts a heat dissipation device through linkage control of a temperature sensor and current information when the temperature rise of the equipment exceeds the standard; meanwhile, through the arc protection and short-circuit protection sub-modules, protection measures are rapidly triggered when an arc is generated or short-circuit current is not completely cut off, equipment damage is avoided, and the dynamic insulation control module adjusts the insulation performance of the equipment in real time through the technologies of partial discharge monitoring, temperature compensation, gas compensation and the like; the insulation state of the equipment is kept stable in high-load and extreme environments, the system also has intelligent control and data processing functions, and the safe operation of the equipment is ensured through real-time monitoring and predictive maintenance and early warning of the equipment fault risk.

Description

Technical Field

[0001] The present invention relates to a full-condition protection system for high-current switching equipment. Background Art

[0002] In high-voltage power equipment, especially high-current switching equipment, due to its complex working environment and facing extreme working conditions, how to ensure the safety and reliability of the equipment under high-current and large short-circuit current conditions is a key issue in power system design. Especially for high-current switching equipment, it is required that it must be able to withstand high rated current and extremely high short-circuit breaking capacity during operation, and at the same time ensure that the insulation performance of the equipment is not damaged.

[0003] Most of the existing technologies rely on single protection measures to cope with these extreme working conditions. For example, the traditional protection system monitors the equipment temperature through a temperature sensor and performs basic temperature protection by setting thresholds. However, the defects of the existing technologies are as follows: The temperature monitoring systems in the existing technologies usually work independently and fail to fully combine current information to achieve interlock control. When the current reaches the rated value, if the temperature rise of the equipment exceeds the threshold, the traditional system may not be able to start forced cooling or disable the closing and opening operations in time, resulting in the inability to effectively prevent the equipment from overheating or being damaged when the temperature exceeds the standard; In addition, although there are arc protection devices and short-circuit protection mechanisms in the existing technologies, they usually fail to respond quickly when an arc is generated or the short-circuit current is not completely cut off. For example, when an arc is generated, the traditional protection system often does not have a fast enough interlock mechanism to quickly cut off the current and prevent the arc from spreading, resulting in equipment damage or system failure.

[0004] Therefore, a full-condition protection system for high-current switching equipment is needed to solve these problems. Summary of the Invention

[0005] The object of the present invention is to solve the above-mentioned deficiencies of the prior art, and provide a full-condition protection system for high-current switching equipment. Through an intelligent interlock mechanism and dynamic insulation control technology, the operation state of the equipment is monitored in real time, and the equipment is intelligently adjusted and protected according to parameters such as temperature, current, partial discharge, and gas pressure, so as to effectively avoid damage to the equipment caused by overload, temperature rise, short circuit, and arc problems, and ensure the reliable operation of the equipment under various extreme working conditions. These objects of the present invention are achieved as follows:

[0006] In one aspect, the present invention provides a full-condition protection system for a high-current switching device, including an intelligent interlock protection module and a dynamic insulation control module. The intelligent interlock protection module is used to automatically control the operation of the device according to the operating state of the device. The intelligent interlock protection module includes: a linkage control sub-module, which is used to monitor the temperatures of the busbar and the breaker contacts in real time through a temperature sensor. When the temperature rise of the switching device exceeds the standard, the on-off operation is automatically disabled, and a forced heat dissipation device is started; an arc protection sub-module, which is used to monitor the arc discharge situation in real time through a grating or an ultraviolet arc detector. When abnormal discharge is detected, the operation of the disconnecting switch is automatically locked, and the breaker is triggered to trip quickly to prevent the spread of the arc; a short-circuit protection sub-module, which is used to prohibit the manual operation of the disconnecting switch or the earthing switch when the device is in a short-circuit state and the short-circuit current has not been completely cut off, to prevent damage to the device caused by the impact of electrodynamic force. The dynamic insulation control module is used to adjust the insulation performance of the device in real time according to information such as temperature and partial discharge. The dynamic insulation control module includes: a partial discharge monitoring sub-module, which is used to monitor the partial discharge situation of the insulation weak points of the device in real time. When the discharge amount exceeds a preset threshold, an alarm is triggered and the cooling system is linked; a temperature compensation sub-module, which is used to dynamically adjust the busbar support spacing according to the operating temperature of the switching device, so as to avoid the reduction of the insulation gap caused by thermal expansion; a gas compensation sub-module, which is used to monitor the internal gas pressure and humidity of the device in real time, and automatically starts a gas replenishment device when the gas pressure is insufficient to maintain the gas insulation performance.

[0007] Furthermore, the linkage control sub-module in the intelligent interlock protection module further includes: an optical fiber temperature sensor, which is used to monitor the temperatures of the busbar and the breaker contacts inside the switching device in real time. When the temperatures of the busbar and the breaker contacts reach a preset threshold, the heat dissipation system is triggered to start, and the on-off operation is prohibited.

[0008] Furthermore, the arc protection sub-module further includes: an arc detector, which is used to detect an arc. When an arc occurs, the arc protection sub-module automatically locks the operation of the disconnecting switch and triggers the breaker to trip to prevent damage to the device caused by the spread of the arc.

[0009] Furthermore, the partial discharge monitoring sub-module in the dynamic insulation control module further includes: a high-frequency sensor, which is used to monitor the partial discharge situation, and when the detected discharge amplitude exceeds the threshold, an alarm is triggered and cooling measures are started to prevent the breakdown of the insulation system.

[0010] Furthermore, the temperature compensation sub-module in the dynamic insulation control module includes: a thermal expansion compensation device, the material of which is epoxy resin, and is used to dynamically adjust the busbar support spacing to avoid the reduction of the insulation gap caused by temperature rise.

[0011] Furthermore, the gas compensation sub-module includes: a gas pressure sensor for real-time monitoring of gas pressure. When the gas pressure is too low, the gas replenishment device is automatically activated to ensure the continuous stability of the gas insulation strength.

[0012] Furthermore, it also includes: a PLC controller for judging whether the interlock conditions are met by processing various sensor data.

[0013] Furthermore, the PLC controller further includes a control switching module. The control switching module is used to switch between remote operation and local operation modes, and is used to prevent misoperation and conflicts when the control module switches permissions between remote and local operation modes.

[0014] On the other hand, the present invention proposes an operation method for a full-condition protection system of a high-current switchgear, including the following steps: S1, real-time monitoring of the temperature, current, short-circuit current, and partial discharge conditions of the equipment; S2, judging whether interlock protection needs to be activated according to the monitoring data, including disabling opening and closing operations, triggering the circuit breaker to trip, arc protection, and starting the heat dissipation device; S3, dynamically adjusting the insulation strength according to the working environment and insulation state of the equipment, and ensuring the stability of the equipment insulation performance under various conditions through gas compensation and temperature compensation means; S4, processing the monitoring data through an intelligent control module to generate a maintenance report and giving an early warning in advance when potential failure risks are found.

[0015] Compared with the prior art, the beneficial effects of the present invention are: through intelligent interlock protection and dynamic insulation control technologies, comprehensive protection of the equipment is realized, and the safety and reliability of the equipment under high current, short-circuit current, and harsh environmental conditions are significantly improved;

[0016] By real-time monitoring of the equipment temperature, current, and partial discharge conditions, protection measures are automatically activated when abnormalities are detected, thereby effectively preventing the equipment from being damaged due to problems such as overload, temperature rise, arc, or short circuit, prolonging the service life of the equipment and reducing the risk of failures. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of a full-condition protection system of a high-current switchgear;

[0018] Figure 2 is an operation method for a full-condition protection system of a high-current switchgear;

[0019] In the figure: 100, intelligent interlocking protection module; 110, linkage control sub-module; 111, fiber optic temperature sensor; 120, arc protection sub-module; 121, arc detector; 130, short-circuit protection sub-module; 200, dynamic insulation control module; 210, partial discharge monitoring sub-module; 211, high-frequency sensor; 220, temperature compensation sub-module; 221, thermal expansion compensation device; 230, gas compensation sub-module; 231, gas pressure sensor; 300, PLC controller; 310, control switching module. Detailed implementation manners

[0020] To deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and the accompanying drawings. The embodiments are only used to explain the present invention and do not limit the protection scope of the present invention.

[0021] Please refer to Figure 1 , on the one hand, an all-condition protection system for a high-current switchgear according to an embodiment of the present invention includes an intelligent interlocking protection module 100 and a dynamic insulation control module 200. The intelligent interlocking protection module 100 is used to automatically control the operation of the equipment according to the operating state of the equipment. The intelligent interlocking protection module 100 includes: a linkage control sub-module 110, which is used to monitor the temperature of the busbar and the breaker contacts in real time through a temperature sensor. When the temperature rise of the switchgear exceeds the standard, the on-off operation is automatically disabled and the forced heat dissipation device is started; an arc protection sub-module 120, which is used to monitor the arc discharge situation in real time through a grating or an ultraviolet arc detector 121. When abnormal discharge is detected, the operation of the disconnector is automatically locked and the breaker is triggered to trip quickly to prevent the spread of the arc; a short-circuit protection sub-module 130, which is used to prohibit the manual operation of the disconnector or the earthing switch when the equipment is in a short-circuit state and the short-circuit current has not been completely cut off, to prevent damage to the equipment caused by the impact of the electrodynamic force; the dynamic insulation control module 200 is used to adjust the insulation performance of the equipment in real time according to information such as temperature and partial discharge. The dynamic insulation control module 200 includes: a partial discharge monitoring sub-module 210, which is used to monitor the partial discharge situation of the insulation weak point of the equipment in real time. When the discharge amount exceeds the preset threshold, an alarm is triggered and the cooling system is linked; a temperature compensation sub-module 220, which is used to dynamically adjust the busbar support spacing according to the working temperature of the switchgear, so as to avoid the reduction of the insulation gap caused by thermal expansion; a gas compensation sub-module 230, which is used to monitor the gas pressure and humidity inside the equipment in real time, and automatically start the gas replenishment device when the gas pressure is insufficient to maintain the gas insulation performance.

[0022] In one embodiment, the linkage control sub-module 110 in the intelligent interlock protection module 100 further includes: an optical fiber temperature sensor 111 for real-time monitoring of the temperature of the busbar and the breaker contacts inside the switching device. When the temperature of the busbar and the breaker contacts reaches a preset threshold, it triggers the start of the heat dissipation system and prohibits the opening and closing operations; the arc protection sub-module 120 further includes: an arc detector 121 for detecting arcs. When an arc occurs, the arc protection sub-module 120 automatically locks the disconnector operation and triggers the breaker to trip to prevent the spread of the arc from damaging the equipment; the partial discharge monitoring sub-module 210 in the dynamic insulation control module 200 further includes: a high-frequency sensor 211 for monitoring the partial discharge situation and triggering an alarm and starting a cooling measure when the detected discharge amplitude exceeds the threshold to prevent the insulation system from breaking down; the temperature compensation sub-module 220 in the dynamic insulation control module 200 includes: a thermal expansion compensation device 221 made of epoxy resin for dynamically adjusting the busbar support spacing to avoid the reduction of the insulation gap caused by temperature rise; the gas compensation sub-module 230 includes: a gas pressure sensor 231 for real-time monitoring of the gas pressure. When the gas pressure is too low, it automatically starts the gas replenishment device to ensure the continuous stability of the gas insulation strength; it further includes: a PLC controller 300 for judging whether the interlock condition is met by processing the data of various sensors; the PLC controller 300 further includes a control switching module 310 for switching between the remote operation and the local operation modes to ensure that when the control module switches permissions between the remote and local operation modes, it can prevent misoperations and conflicts from occurring.

[0023] Please refer to Figure 2 , on the other hand, an operation method of a full-condition protection system for a high-current switching device according to an embodiment of the present invention includes the following steps: S1. Real-time monitoring of the temperature, current, short-circuit current, and partial discharge situation of the device; S2. Judging whether interlock protection needs to be started according to the monitoring data, including disabling the opening and closing operations, triggering the breaker to trip, arc protection, and starting the heat dissipation device; S3. Dynamically adjusting the insulation strength according to the working environment and insulation state of the device, and ensuring the stability of the device insulation performance under various conditions through gas compensation and temperature compensation means; S4. Processing the monitoring data through the intelligent control module to generate a maintenance report and giving an early warning in advance when potential failure risks are found.

[0024] In a possible implementation scenario, for example, in the daily operation of a substation, the switching equipment in the substation faces challenges such as high rated current and extremely high short-circuit breaking capacity. These switching equipment often operate in complex environments, and due to changes in the external environment, the insulation performance of the equipment may be affected. When a short-circuit current occurs, without timely protection measures, it may lead to the spread of the arc and permanent damage to the equipment, and even trigger system-level failures; in the substation, when the high-voltage switching equipment is at the peak load, the intelligent interlock protection module 100 monitors the temperatures of the busbar and the breaker contacts in real time through the temperature and current linkage control system. When the current approaches the rated value and the temperature rise of the equipment exceeds the preset safety threshold, the system automatically disables the opening and closing operations and starts forced cooling devices such as fans. At this time, the equipment will not fail due to overheating, ensuring the safety and stable operation of the equipment; if an arc or short-circuit fault occurs, the arc protection sub-module 120 will immediately detect the occurrence of the arc through a grating or ultraviolet arc detector 121, trigger the interlock protection measures, automatically lock the disconnector operation, and immediately trip the circuit breaker to prevent the arc from spreading and causing more extensive equipment damage or power system failures. In addition, the short-circuit protection sub-module 130 ensures that any manual operation of the disconnector or earthing switch is prohibited before the short-circuit current is completely eliminated, avoiding mechanical damage to the equipment caused by the electrodynamic shock; in extreme working conditions, such as high-current loads or high-temperature environments, the insulation performance of the equipment may be affected by factors such as partial discharge and temperature rise. At this time, the dynamic insulation control module 200 monitors the insulation status of the equipment in real time through the partial discharge monitoring sub-module, and when the partial discharge amount exceeds the threshold, starts the cooling system to prevent insulation breakdown. At the same time, the temperature compensation sub-module 220 avoids the reduction of the insulation gap caused by temperature rise by dynamically adjusting the busbar support spacing, ensuring the continuous and reliable operation of the insulation system; in the high-humidity environment of the substation, the gas-insulated equipment may cause gas failure due to excessive humidity. The gas compensation sub-module 230 automatically starts the gas replenishment device when detecting insufficient gas pressure by real-time monitoring of the internal gas pressure and humidity of the equipment to ensure the normal operation of the gas insulation system. In addition, combined with the temperature and humidity sensors, the system can adapt to different environmental changes, ensuring that the equipment can operate stably in harsh environments; the operating personnel of the substation can monitor the equipment status in real time through the intelligent control and data processing module, and generate a health report of the equipment based on the real-time data. If there is a potential failure risk during the operation of the equipment, the system will issue an early warning in advance and automatically generate a maintenance work order. This function not only greatly reduces the occurrence of sudden failures, but also improves the operation efficiency of the equipment and reduces the maintenance cost.

[0025] The full-condition protection system for high-current switchgear of the present invention ensures the safety and reliability of substation equipment under complex conditions such as high current, short circuit, and temperature change through the effective combination of intelligent interlock protection and dynamic insulation control. At the same time, the environmental adaptability and predictive maintenance functions of the system enable the equipment to operate continuously and stably in harsh environments, greatly reducing the downtime caused by equipment failures and improving the overall power supply capacity and operation efficiency of the substation.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A full-condition protection system for high-current switchgear, characterized in that: It includes an intelligent interlocking protection module and a dynamic insulation control module. The intelligent interlocking protection module is used to automatically control the operation of the equipment according to the operating status of the equipment. The intelligent interlocking protection module includes: a linkage control submodule, which is used to monitor the temperature of the busbar and the circuit breaker contacts in real time through a temperature sensor. When the temperature rise of the switch equipment exceeds the standard, the opening and closing operations are automatically disabled, and the forced heat dissipation device is started; an arc protection submodule, which is used to monitor the arc discharge in real time through a grating or ultraviolet arc detector. When abnormal discharge is detected, the isolation switch operation is automatically locked and the circuit breaker is triggered to trip quickly to prevent the arc from spreading; a short-circuit protection submodule, which is used to prohibit manual Operate the isolating switch or the earthing switch to prevent the equipment from being damaged by electrodynamic shock; the dynamic insulation control module is used to adjust the insulation performance of the equipment in real time according to information such as temperature and partial discharge. The dynamic insulation control module includes: a partial discharge monitoring submodule, which is used to monitor the partial discharge of the weak points of the insulation of the equipment in real time. When the discharge exceeds the preset threshold, an alarm is triggered and the cooling system is linked; a temperature compensation submodule, which is used to dynamically adjust the busbar support spacing according to the operating temperature of the switchgear, so as to avoid the reduction of the insulation gap caused by thermal expansion; a gas compensation submodule, which is used to monitor the gas pressure and humidity inside the equipment in real time, and automatically start the gas replenishment device when the gas pressure is insufficient to maintain the gas insulation performance.

2. A full-condition protection system for high-current switchgear according to claim 1, characterized in that: The linkage control submodule in the intelligent interlocking protection module further includes: an optical fiber temperature sensor, which is used to monitor the temperature of the busbar and circuit breaker contacts inside the switch device in real time. When the temperature of the busbar and the circuit breaker contacts reaches a preset threshold, the heat dissipation system is triggered to start and the opening and closing operations are prohibited.

3. The full-operating condition protection system for high-current switchgear according to claim 1, characterized in that: The arc protection submodule further includes: an arc detector for detecting an arc. When an arc occurs, the arc protection submodule automatically locks the disconnector operation and triggers the circuit breaker to trip, preventing the arc from spreading and causing damage to the equipment.

4. A full-operating condition protection system for high-current switchgear according to claim 1, characterized in that: The partial discharge monitoring submodule in the dynamic insulation control module further includes: a high-frequency sensor for monitoring partial discharge conditions, and when it is detected that the discharge amplitude exceeds a threshold, triggering an alarm and starting cooling measures to prevent the insulation system from breaking down.

5. The full-condition protection system for high-current switchgear according to claim 1, characterized in that: The temperature compensation submodule in the dynamic insulation control module includes: a thermal expansion compensation device, the thermal expansion compensation device is made of epoxy resin and is used to dynamically adjust the busbar support spacing to avoid the insulation gap from shrinking due to temperature rise.

6. A full-condition protection system for high-current switchgear according to claim 1, characterized in that: The gas compensation submodule includes: a gas pressure sensor for real-time monitoring of gas pressure. When the gas pressure is too low, a gas replenishing device is automatically started to ensure that the gas insulation strength is continuously stable.

7. A full-condition protection system for high-current switchgear according to claim 1, characterized in that: Also includes: The PLC controller is used to determine whether the interlocking conditions are met by processing the data from various sensors.

8. A full-condition protection system for high-current switchgear according to claim 7, characterized in that: The PLC controller also includes a control switching module, which is used to switch between remote operation and local operation modes, and is used to ensure that when the control module switches permissions between remote and local operation modes, misoperation and conflict can be prevented.

9. An operating method of a full-condition protection system for a high-current switchgear according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Real-time monitoring of the temperature, current, short-circuit current and partial discharge of the equipment; S2. Determine whether to start interlock protection based on the monitoring data, including disabling opening and closing operations, triggering circuit breaker tripping, arc protection and starting heat dissipation devices; S3. The working environment and insulation status of the equipment are dynamically adjusted to ensure the insulation strength. Through gas compensation and temperature compensation, Ensure that the insulation performance of the equipment remains stable under various working conditions; S4, process monitoring data through the intelligent control module, Generate maintenance reports and get early warning when potential failure risks are detected.

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