A condensation-proof and moisture-proof protection system for an offline bus and a control method thereof

Abstract

The application provides a condensation-proof and moisture-proof protection system for an offline bus and a control method thereof, and belongs to the technical field of operation protection of power equipment. The system comprises an air source drying treatment unit, an intelligent control and air supply unit, a monitoring and imaging unit, a man-machine interaction unit and a data recording and tracing unit. The air source drying treatment unit is used for performing freezing drying, micro-heat adsorption drying and filtering treatment on compressed air to obtain dry and clean gas; the intelligent control and air supply unit is used for collecting information about the internal pressure, humidity and air source state of the bus cylinder, performing automatic air source switching, air supply valve start-stop control and forced condensation-proof protection; and the monitoring and imaging unit is used for obtaining real-time pictures inside the bus cylinder and assisting in identifying condensation risk. The application can effectively inhibit the influence of condensation and moisture on the insulation performance during the operation or shutdown of the offline bus, and improve the operation safety and reliability of the bus system.

Description

Technical Field

[0001] This invention relates to the field of power equipment operation protection technology, and in particular to an anti-condensation and moisture protection system and control method for offline busbars. Background Technology

[0002] Offline busbars, as crucial components in power systems for energy transmission and equipment connection, are widely used in dry-type substations, power plants, and other locations. During equipment shutdown, maintenance, or standby periods, they are typically in an off-load or low-load state. In this situation, the busbar drum lacks the temperature rise effect of energized operation, making its internal environment susceptible to external temperature and humidity changes. Especially in scenarios with large diurnal temperature variations or high ambient humidity, condensation and moisture accumulation are highly likely to occur inside the busbar drum. When condensation adheres to the surfaces of insulators or conductors, it can lead to decreased insulation performance, surface discharge, or even insulation breakdown, posing significant safety hazards to subsequent energization operations.

[0003] In existing technologies, the prevention of condensation and moisture on offline busbars is typically addressed by timed air supply, continuous ventilation, or simple dehumidification devices. However, these methods are mostly based on fixed operating conditions or manual experience, making it difficult to adaptively adjust to the actual humidity levels inside the busbar, air supply conditions, and environmental changes. On the one hand, a single air source can easily lead to unreliable protection when the supply pressure is unstable or the gas dryness is insufficient. On the other hand, the lack of effective start-stop criteria and closed-loop confirmation mechanisms can easily result in insufficient or excessive air supply, affecting the anti-condensation effect and increasing operating energy consumption and equipment wear.

[0004] Therefore, we propose an anti-condensation and moisture-proof protection system and control method for offline busbars. The information disclosed above in the background section is only for enhancing the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing an anti-condensation and moisture-proof protection system and control method for offline busbars, thereby solving the technical problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A control method for an offline busbar anti-condensation and moisture-proof protection system includes the following steps: S1. Collect data on the internal pressure of the busbar drum, the internal humidity of the busbar drum, the main gas source supply pressure, the surface humidity of the insulators and conductors, the ambient humidity around the insulators and conductors, and real-time images of the inside of the busbar drum according to the collection cycle, and generate data validity labels; prepare dry and clean gas and generate gas availability labels. S2. When the data validity identifier is valid and the gas availability identifier is available, determine the availability of the main gas source and confirm it after a delay. Switch between the main gas source channel and the backup gas source channel according to the determination result, and generate a gas source stability identifier after parallel transition during the switchback. S3. When the gas source stability indicator is stable, control the start and stop of the gas supply valve according to the internal pressure and humidity of the busbar drum, and confirm the pressure response after start and stop. If there is an abnormality, generate a gas supply abnormality indicator or a pressure stagnation abnormality indicator respectively. S4. In standby mode, generate a condensation risk indicator and confirm it in conjunction with the real-time image inside the busbar drum; when triggered, force air supply and generate a protection effect indicator; close the air supply valve when the exit conditions are met, and generate a forced protection abnormality indicator if the timeout occurs. S5 displays and records the collected data, control status, and various indicators, and provides alarm and traceability; it executes S1–S4 cyclically according to the collection cycle and performs self-verification. If it fails, it downgrades to ensure the goals of preventing condensation and moisture.

[0007] S1 specifically includes: setting a collection period, synchronously collecting the internal pressure of the busbar drum, the internal humidity of the busbar drum, the main air source supply pressure, the surface humidity of the insulators and conductors, the ambient humidity around the insulators and conductors, and real-time images of the inside of the busbar drum according to the collection period, and forming periodic valid values ​​for the internal pressure and internal humidity of the busbar drum; performing missing, out-of-range, and jump checks on the periodic valid values, and generating a data validity identifier; sequentially performing freeze drying, micro-thermal adsorption drying, and multi-stage filtration on the compressed air to be fed into the busbar drum, and generating a gas availability identifier based on the outlet dew point temperature and the dew point temperature threshold.

[0008] S2 specifically includes: under the condition that the data validity identifier is valid and the gas availability identifier is available, the availability of the main gas source is determined based on the periodic valid value of the main gas source supply pressure; when the main gas source availability is determined to be unavailable and continues to reach the preset delay, the main gas source channel is closed and the backup gas source channel is opened; when the main gas source availability is determined to be available again, the main gas source channel is switched back, and after the main gas source channel and the backup gas source channel supply gas in parallel for a preset transition time, the backup gas source channel is closed, and a gas source stability identifier is generated at the same time.

[0009] S3 specifically includes: under the conditions that the gas availability indicator is available and the gas source stability indicator is stable, performing routine start-up and routine shutdown judgments based on the effective values ​​of the internal pressure cycle and the effective values ​​of the internal humidity cycle of the busbar drum; when the routine start-up judgment is continuously satisfied and the gas supply valve is in the closed state, the gas supply valve is opened to enter the gas supply operation state, and the pressure rise response after opening is confirmed. If the confirmation fails, a gas supply abnormality indicator is generated; when the routine shutdown judgment is continuously satisfied and the gas supply valve is in the open state, the gas supply valve is closed to enter the standby state, and the pressure fall response after closing is confirmed. If the confirmation fails, a pressure stagnation abnormality indicator is generated.

[0010] S4 specifically includes: in the standby state where the air supply valve is closed and the normal start-up judgment is not met, a condensation risk indicator is generated based on the surface humidity of the insulator and conductor bar and the ambient humidity around the insulator and conductor bar, and the pixel ratio of the suspected condensation area is extracted from the real-time image inside the busbar drum for auxiliary confirmation; when the condensation risk indicator meets the forced protection trigger condition, the air supply valve is forcibly opened to enter the forced protection operation state, and a protection effect indicator is generated based on the change in the pixel ratio of the suspected condensation area; when the exit condition is met and the preset number of cycles is met continuously, the air supply valve is closed to return from the forced protection operation state to the standby state; if the exit condition is not met within the preset maximum continuous forced protection operation time, a forced protection abnormality indicator is generated.

[0011] S5 specifically includes: centrally displaying the internal pressure of the busbar drum, the internal humidity of the busbar drum, the main gas source supply pressure, the gas source channel status, the gas supply valve status, and various indicators and real-time images of the busbar drum interior; recording the original data, periodic valid values, and judgment and action results according to the acquisition cycle; triggering an alarm when an abnormality occurs and associating and archiving the real-time images of the busbar drum interior corresponding to the acquisition cycle; the controller is continuously powered on and executes S1–S4 in a cyclical manner according to the acquisition cycle, and performs consistency self-verification on the gas availability indicator, gas source stability indicator, and condensation risk indicator. If the self-verification fails, a degradation strategy is entered to prioritize the anti-condensation and moisture-proof safety objectives of the offline busbar.

[0012] An anti-condensation and moisture-proof protection system for offline busbars includes: The air source drying unit is used to dry and purify the compressed air that is fed into the busbar drum of the offline busbar and output dry and clean gas. The intelligent control and gas supply unit is connected to the outlet of the gas source drying and treatment unit. It is used to send dry and clean gas into the busbar and realize gas source selection, gas supply start and stop and protection control. The monitoring and imaging unit is used to perform imaging monitoring of key areas inside the busbar drum that are prone to condensation and to output real-time images of the inside of the busbar drum. The human-machine interaction unit communicates with the controller and is used for centralized display, recording, and alarm functions; the human-machine interaction unit includes at least a display component and an interaction component. The data recording and traceability unit communicates with the controller and is used to store historical data, periodic effective values, control judgment results, valve group action results, gas source switching events, and abnormal alarms.

[0013] The beneficial effects of this invention are as follows: This invention achieves accurate perception of the internal environmental status of offline busbars by collecting and periodically processing multiple parameters, including internal pressure and humidity of the busbar drum, as well as surface humidity of insulators / line bars and ambient humidity. Compared to traditional solutions that rely solely on a single humidity parameter, this invention more realistically reflects condensation risk and effectively improves the reliability of anti-condensation and moisture control. By introducing an automatic switching mechanism between the main and backup air sources and implementing parallel air supply transition control during the switchback process, this invention can maintain a continuous and stable air supply under conditions of fluctuating or abnormal air source pressure, preventing the anti-condensation effect from failing due to unstable air source and improving the stability and robustness of the system operation.

[0014] This invention implements routine start-stop control of the air supply valve based on a combined criterion of internal pressure and humidity of the busbar drum. It also performs closed-loop confirmation of the pressure response after the valve's start-stop, enabling timely identification of abnormal operating conditions such as abnormal air supply or pressure stagnation, reducing malfunctions and ineffective air supply, and improving the safety and controllability of the control process. By introducing condensation risk identification based on the surface humidity of the insulator / busbar and ambient humidity in standby mode, and combining this with real-time internal images of the busbar drum for auxiliary confirmation, this invention can proactively trigger forced protective air supply before condensation becomes severe, significantly improving the foresight and effectiveness of condensation prevention.

[0015] This invention evaluates the effectiveness of condensation characteristic changes during forced protection operation and sets clear exit conditions and anomaly judgment mechanisms. It can ensure anti-condensation effectiveness while avoiding prolonged ineffective air supply, thereby reducing energy consumption and equipment wear, and improving overall system operating efficiency. By centrally displaying, recording, and tracing operational data, control judgment results, and abnormal events, and introducing consistency self-verification and degradation strategies, this invention can significantly improve the maintainability and operational reliability of offline bus anti-condensation and moisture-proof systems, providing strong support for subsequent operation and maintenance management and fault analysis. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a control method for an offline busbar anti-condensation and moisture-proof protection system according to the present invention; Figure 2 This is a partial framework diagram of an anti-condensation and moisture-proof protection system for an offline busbar according to the present invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1: As Figure 1 As shown, this embodiment provides a control method for an anti-condensation and moisture-proof protection system for offline busbars, including the following steps: S1. Collect data on the internal pressure of the busbar drum, the internal humidity of the busbar drum, the main gas source supply pressure, the surface humidity of the insulators and conductors, the ambient humidity around the insulators and conductors, and real-time images of the inside of the busbar drum according to the collection cycle, and generate data validity labels; prepare dry and clean gas and generate gas availability labels.

[0019] S2. When the data validity identifier is valid and the gas availability identifier is available, determine the availability of the main gas source and confirm it after a delay. Switch between the main gas source channel and the backup gas source channel according to the determination result, and generate a gas source stability identifier after parallel transition during the switchback.

[0020] S3. When the gas source stability indicator is stable, control the start and stop of the gas supply valve based on the internal pressure and humidity of the busbar drum, and confirm the pressure response after start and stop. If there is an abnormality, generate a gas supply abnormality indicator or a pressure stagnation abnormality indicator respectively.

[0021] S4. In standby mode, generate a condensation risk indicator and confirm it in conjunction with the real-time image inside the busbar drum; when triggered, force air supply and generate a protection effect indicator; close the air supply valve when the exit conditions are met, and generate a forced protection abnormality indicator if the timeout is exceeded.

[0022] S5 displays and records the collected data, control status, and various indicators, and provides alarm and traceability; it executes S1–S4 cyclically according to the collection cycle and performs self-verification. If it fails, it downgrades to ensure the goals of preventing condensation and moisture.

[0023] S1 specifically includes the following sub-steps: S110. Establish monitoring targets and synchronous data acquisition mechanism: In the anti-condensation and moisture-proof protection system for offline busbars, the busbar drum of the offline busbar is identified as the monitoring target, and a fixed data acquisition cycle is set. (Data acquisition cycle, in seconds), and within each acquisition cycle, the internal pressure of the busbar drum, the internal humidity of the busbar drum, the main air supply pressure, the surface humidity of the insulators and conductors, and the ambient humidity around the insulators and conductors are simultaneously acquired. At the same time, real-time images of the busbar drum's interior are captured by cameras installed at key condensation-prone areas within the busbar drum. The sampled values ​​of the internal pressure and humidity of the busbar drum within the acquisition cycle are timestamped, and the arithmetic mean of the values ​​within the acquisition cycle is used as the effective value for the corresponding acquisition cycle, forming a set of effective values ​​for subsequent control decisions.

[0024] S120. Data consistency verification and periodic valid value update: Perform consistency verification on the set of periodic valid values ​​for each collection period, including missing data verification, out-of-range verification and jump verification; when missing data or out-of-range data occurs, the corresponding parameter of the collection period is determined to be invalid, and the corresponding parameter periodic valid value of the previous collection period is used to backfill it. At the same time, a data validity identifier is generated to characterize the parameter validity of the collection period.

[0025] The jump check is based on the rate of change between adjacent acquisition cycles. When any acquisition parameter satisfies the following condition within an adjacent acquisition cycle: When this happens, the collected parameters are identified as abruptly changing data and deemed invalid; where, Represents absolute value. This indicates the parameter value for the current acquisition period. This represents the parameter value from the previous acquisition cycle. This indicates the preset rate of change threshold, and the subscript n represents the collection period number; when When the value is 0, the collected parameters are directly determined to be invalid.

[0026] When the number of consecutive backfills reaches the preset backfill limit, a data anomaly flag is generated and the corresponding parameters are stopped from being updated until a valid period value that has passed the consistency check is obtained in the subsequent collection cycle.

[0027] S130. Preparation and Availability Determination of Dry Clean Gas: Compressed air to be fed into the busbar is sequentially subjected to refrigeration drying and micro-thermal adsorption drying, followed by multi-stage filtration to obtain dry clean gas; after obtaining the dry clean gas, the gas is determined based on the outlet dew point temperature of the dry clean gas. (Outlet dew point temperature, in degrees Celsius) and preset dew point temperature threshold (Dew point temperature threshold, in degrees Celsius) Availability indicator for generated gas: When the following conditions are met: When the conditions are met, the gas availability indicator is set to available; when the conditions are not met, the gas availability indicator is set to unavailable. The gas availability indicator is used as a prerequisite for subsequent gas source selection and gas supply valve control to ensure that the gas supplied to the busbar meets the requirements for anti-condensation and moisture prevention.

[0028] S2 specifically includes the following sub-steps: S210. Main gas source availability determination and unified determination criteria: Under the premise that the data validity indicator is valid and the gas availability indicator is available, the periodic valid value of the main gas source supply pressure within the corresponding collection period is used as the determination input for the main gas source supply pressure, and the main gas source supply pressure is compared with the preset main gas source pressure range; wherein, the main gas source pressure range is 0.35MPa (megapascal, a pressure unit) to 0.7MPa.

[0029] When the main gas source pressure is within the main gas source pressure range for N consecutive sampling cycles (the number of consecutive sampling cycles, which is an integer), the main gas source is deemed available. When the main gas source pressure is not within the main gas source pressure range in any sampling cycle, the main gas source is deemed unavailable. The main gas source availability determination is used as the sole trigger for subsequent delayed confirmation and gas source switching.

[0030] S220, Delay Confirmation and Anti-Jitter Switching Logic: When the main gas source is determined to be unavailable, a delay timer is started and the delay confirmation state is entered; the delay timer is continuous and the preset delay is 3 seconds; when the main gas source is determined to be available again within any acquisition cycle, the delay timer is cleared and the delay confirmation state is exited.

[0031] When the delay timer reaches the preset delay and the main gas source is still deemed unavailable, the main gas source channel is shut down and the backup gas source channel is opened, completing the switch from the main gas source channel to the backup gas source channel. The reason for the switch and the switch time are recorded at the same time. When the main gas source is deemed available again, the system enters the switchback preparation state so that the gas source channel can switch back from the backup gas source channel to the main gas source channel.

[0032] S230, Parallel Steady-State Transition and Gas Source Stability Identification Generation: In the return-to-start preparation state, switch back to the main gas source channel, and after the main gas source channel and the backup gas source channel supply gas in parallel for a preset transition time, close the backup gas source channel; wherein, the preset transition time is 60 seconds.

[0033] During the parallel gas supply phase, a gas source stability indicator is generated based on the pressure fluctuation amplitude and humidity decrease trend inside the busbar. The pressure sequence and humidity inside the busbar are both taken as the effective values ​​of the corresponding acquisition period. This indicates taking the maximum value. This indicates taking the minimum value, and the subscript k represents the sampling period number. When the condition is met... And satisfy When the gas source stability is stable, the generated gas source stability is marked as stable; otherwise, the generated gas source stability is marked as unstable; where P represents the internal pressure sequence of the busbar during the parallel gas supply phase. This indicates the pressure fluctuation threshold (in Pa). This indicates the percentage of humidity inside the busbar drum during the current data collection period. This indicates the percentage of humidity inside the busbar drum during the previous data collection period. This indicates the threshold for the rate of humidity decrease (in percentage per second).

[0034] The gas source stability indicator is used as a pre-reference input for subsequent gas supply valve control to ensure that the gas supply process is stable and repeatable after the gas source channel is switched.

[0035] S3 specifically includes the following sub-steps: S310. Construction and Continuous Satisfaction Confirmation of Conventional Start-up and Shutdown Criteria: Under the premise that the gas availability indicator is available and the gas source stability indicator is stable, the periodic effective values ​​of the internal pressure and internal humidity of the busbar drum within the corresponding acquisition period are used as the judgment input to construct conventional start-up and conventional shutdown criteria: When the internal pressure of the busbar drum is less than or equal to 300 Pa (Pa, a pressure unit) and the internal humidity of the busbar drum is greater than or equal to 65%, the conventional start-up criterion is satisfied; when the internal pressure of the busbar drum is greater than or equal to 2500 Pa or the internal humidity of the busbar drum is less than or equal to 45%, the conventional shutdown criterion is satisfied.

[0036] To suppress false triggering caused by acquisition noise, the gas valve is only triggered to open when the normal start-up condition is met for M consecutive acquisition cycles (number of consecutive acquisition cycles, an integer) and the gas valve is in the closed state; the gas valve is only triggered to close when the normal close-up condition is met for M consecutive acquisition cycles and the gas valve is in the open state.

[0037] S320, Gas Supply Valve Opening Action and Rise Response Closed-Loop Confirmation: When the continuous satisfaction conditions of the conventional start-up judgment are met and the gas supply valve is in the closed state, the gas supply valve is opened and the gas supply operation state is entered; in the first acquisition cycle after entering the gas supply operation state, the rise response confirmation of the internal pressure of the busbar drum is performed, when the following conditions are met: When the air supply valve is activated, it is determined that the air supply operation is effective and the air supply operation is maintained. When the upward response confirmation condition is not met, an air supply anomaly indicator is generated and the periodic effective values ​​of the internal pressure and internal humidity of the busbar drum for the corresponding collection period are recorded as the basis for subsequent fault alarms and tracing. This indicates the internal pressure of the busbar drum during the current data acquisition cycle (cycle effective value). This indicates the internal pressure of the busbar cylinder in the previous data collection cycle (cycle effective value). This indicates the preset rising response threshold (in Pa).

[0038] Furthermore, to avoid frequent starting and stopping of the air supply valve, the air supply valve is not closed within a preset minimum interval after it has completed the opening action.

[0039] S330, Closed-loop Confirmation of Gas Supply Valve Closure Action and Pressure Reduction Response: When the continuous satisfaction conditions of the conventional closure judgment are met and the gas supply valve is in the open state, the gas supply valve is closed and the system enters standby mode; in the first acquisition cycle after entering standby mode, the pressure reduction response confirmation of the busbar drum is performed, and when the following conditions are met: When the gas supply valve is closed, it is determined that the action is effective and the standby state is maintained; when the fallback response confirmation condition is not met, a pressure retention anomaly indicator is generated and the periodic effective values ​​of the internal pressure and internal humidity of the busbar drum for the corresponding collection period are recorded for subsequent alarm and traceability; among which, This indicates the preset fallback response threshold (in Pa).

[0040] Furthermore, to avoid frequent starting and stopping of the air supply valve, the air supply valve is not opened within a preset minimum interval after it has completed the closing action.

[0041] S4 specifically includes the following sub-steps: S410. Condensation Risk Identification and Trigger Determination in Standby State: In standby state where the air supply valve is closed and the normal start-up determination is not met, the relative humidity difference ratio between the surface humidity of the insulator and conductor bar and the ambient humidity around the insulator and conductor bar is calculated based on the effective value of the period within the acquisition cycle. This ratio is used to characterize the degree of condensation risk. The calculation method is as follows: Where R represents the relative humidity difference ratio (dimensionless). Indicates the surface moisture (percentage) of insulators and busbars. Indicates the humidity (percentage) of the environment surrounding the insulator and busbar. This indicates a preset margin threshold (dimensionless), when When the value is 0, the relative humidity difference ratio R is determined to be invalid or directly set to 0.

[0042] When the relative humidity difference is When a condensation risk is detected, a condensation risk indicator is generated. Simultaneously, under the condition of generating a condensation risk indicator, suspected condensation areas are extracted from the real-time image inside the busbar drum, and the pixel ratio of the suspected condensation areas is calculated to help confirm the condensation risk level, so as to avoid false triggering caused by relying on a single humidity criterion.

[0043] S420. Forced Protection Operation and Closed-Loop Evaluation of Protection Effect: When a condensation risk indicator is generated and the forced protection triggering conditions are met, the gas supply valve is forcibly opened and the forced protection operation state is entered to continuously supply dry and clean gas to the busbar drum. Under the forced protection operation state, the surface humidity of the insulators and conductors, the ambient humidity around the insulators and conductors, and the real-time image inside the busbar drum are continuously monitored according to the acquisition cycle. Based on the change in the pixel ratio of suspected condensation areas in adjacent acquisition cycles, a protection effect indicator is generated. The change is calculated as follows: in, This indicates the percentage of pixels in the suspected condensation area during the current collection period (the value ranges from 0 to 1). This indicates the percentage of pixels in the suspected condensation area from the previous collection period (the value ranges from 0 to 1). This represents the decrease in the percentage of pixels in the suspected condensation area (dimensionless). This indicates the preset threshold for the amount of descent (dimensionless).

[0044] When the decrease Greater than or equal to the preset descent threshold When the condensation characteristics show a weakening trend, a protection effect indicator is generated as valid; at the same time, the protection effect indicator and the humidity change trend are used together as input for subsequent exit judgment.

[0045] S430. Exit Condition Determination and Status Reversal: Under forced protection operation state, when the following conditions are met and continuously... If the condition is met continuously within (number of consecutive sampling cycles, an integer), the exit condition is determined and the air supply valve is closed, causing the system to return from forced protection operation to standby state: First, the relative humidity difference ratio R is greater than This indicates that the risk of condensation between the surface humidity of insulators and busbars and the humidity of their surrounding environment has been reduced to a safe margin. Secondly, the percentage of pixels in the suspected condensation area during the current collection period is less than or equal to the preset pixel percentage threshold, and the protection effect indicator remains valid.

[0046] If the exit conditions are not met within the preset maximum continuous forced protection running time, a forced protection abnormality flag is generated and an alarm is triggered. At the same time, the gas supply status is maintained or adjusted according to the preset degradation strategy to prioritize the anti-condensation and moisture-proof safety objectives of the offline bus.

[0047] S5 specifically includes the following sub-steps: S510, Centralized Display and Link Visualization: The system centrally displays the internal pressure and humidity of the busbar, the main gas supply pressure, the current gas source channel status, the gas supply valve status, condensation risk indicators, gas availability indicators, gas source stability indicators, main gas source availability determination, normal start determination, normal shutdown determination, protection effect indicators, gas supply anomaly indicators, pressure retention anomaly indicators, forced protection anomaly indicators, data validity indicators, data anomaly indicators, and real-time images of the busbar, to achieve visualization of the control link of acquisition, determination, execution, and confirmation. Among them, the internal pressure and humidity of the busbar, the main gas supply pressure, and the current gas source channel status are refreshed according to the acquisition cycle, and various indicators and alarm information are updated in real time when generated or updated to ensure that the displayed content is consistent with the control status.

[0048] S520, Historical Records, Alarm Triggering and Event Association Archiving: Historical records are kept for each acquisition cycle, including raw acquisition data, cycle valid value set, data validity indicator, main gas source availability determination, normal start determination, normal shutdown determination, condensation risk indicator, protection effect indicator, gas availability indicator, gas source stability indicator, gas supply valve action execution result, and abnormal indicator. When an abnormal gas supply indicator, pressure retention abnormal indicator, forced protection abnormal indicator, data abnormal indicator, or frequent gas source switching event occurs, an alarm is triggered, and the alarm is associated with the real-time image inside the busbar drum, the cycle valid value of the pressure inside the busbar drum, and the cycle valid value of the humidity inside the busbar drum for the corresponding acquisition cycle and archived.

[0049] Among them, frequent gas source switching events are determined by the frequency of gas source switching within a time window, and the calculation method is as follows: Where f represents the gas source switching frequency (in times / second). This indicates the number of times the gas source is switched within the preset time window (in times). This indicates the length of the preset time window (in seconds); when the gas source switching frequency f is greater than the preset frequency threshold, it is determined as a frequent gas source switching event and an alarm is triggered.

[0050] S530, Cyclic Scheduling, Closed-Loop Self-Verification and Degradation Strategy: The controller continuously executes S110 to S430 according to the acquisition cycle while in a continuously powered state. At the end of each cycle, it performs a consistency self-verification on the gas availability flag, gas source stability flag and condensation risk flag to verify the consistency between the flag status and its corresponding criterion result. The mapping relationship between the corresponding criteria results includes at least the following: the criterion corresponding to the gas availability identifier is... The criteria corresponding to the gas source stability indicator are: and The criteria for identifying condensation risk are as follows: Furthermore, it meets the condition that the percentage of pixels in the suspected condensation area reaches the level required for auxiliary confirmation of condensation risk.

[0051] Consistency self-verification is characterized by consistency verification results, and is defined as follows: Where C represents the consistency verification result; when the consistency verification result of any identifier is 0 in L consecutive (number of consecutive acquisition cycles, which is an integer) acquisition cycles, the self-verification is determined to have failed and the degradation strategy is entered, and the reason for the self-verification failure is recorded at the same time; the degradation strategy includes at least one or more of the following: fixed selection of the current gas source channel, increase the priority of forced protection triggering, extend the opening duration of the gas supply valve, or temporarily suppress the gas source channel back-cutting action, so as to prioritize the anti-condensation and moisture-proof safety objectives of the offline bus.

[0052] Example 2: Figure 2 As shown, this embodiment provides an anti-condensation and moisture-proof protection system for offline busbars, including: The air source drying unit is used to dry and purify the compressed air fed into the busbar drum of the offline busbar and output dry and clean gas. The air source drying unit includes at least a refrigerated drying component, a micro-thermal adsorption drying component and a multi-stage filtration component, and a gas state detection component for characterizing the drying and purification effect is set on its outlet side. An intelligent control and gas delivery unit, connected to the outlet of the gas source drying and treatment unit, is used to deliver dried and clean gas into the busbar and to achieve gas source selection, gas delivery start / stop, and protection control; the intelligent control and gas delivery unit includes at least: Controller (control unit); Main gas source channel and backup gas source channel; A gas source switching valve group for switching between the main gas source channel and the backup gas source channel, and a parallel gas supply control valve group for parallel gas supply transition during back-cut. An air supply valve connected to the busbar drum; The sensing and acquisition components include at least a busbar drum internal pressure detection component, a busbar drum internal humidity detection component, a main air source supply pressure detection component, an insulator and conductor bar surface humidity detection component, and an insulator and conductor bar surrounding environment humidity detection component. The controller is configured to: generate periodic valid values ​​from the sensor acquisition results according to the acquisition cycle and perform consistency verification; when the data validity and gas availability conditions are met, perform delayed confirmation gas source switching control based on the main gas source supply pressure, and exit the backup gas source channel after parallel gas supply transition when switching back to the main gas source channel; under stable gas source conditions, perform regular start-stop control of the gas supply valve based on the internal pressure and humidity of the busbar and confirm the pressure response after start-stop; in standby mode, generate condensation risk based on the surface humidity of the insulators and conductors and the ambient humidity around the insulators and conductors and trigger forced gas supply protection, and close the gas supply valve when the exit conditions are met; and perform consistency self-verification on gas availability, gas source stability and condensation risk, and enter degraded control when self-verification fails to prioritize the anti-condensation and moisture-proof objectives. The monitoring and imaging unit is used to perform imaging monitoring of key parts inside the busbar drum that are prone to condensation and output real-time images of the inside of the busbar drum. The monitoring and imaging unit includes at least a camera component and an image analysis component installed inside the busbar drum. The image analysis component is used to extract suspected condensation areas from the real-time images inside the busbar drum and output suspected condensation characteristic quantities. The controller uses the suspected condensation characteristic quantities to assist in confirming the condensation risk and evaluate the effect of forced gas supply protection. The human-machine interaction unit communicates with the controller and is used for centralized display, recording and alarm. The human-machine interaction unit includes at least a display component and an interaction component. The display component is used to display the internal pressure of the busbar drum, the internal humidity of the busbar drum, the main air supply pressure, the status of the air source channel, the status of the air supply valve, as well as the condensation risk and abnormal alarm information, and to display the real-time picture inside the busbar drum. The data recording and traceability unit communicates with the controller and is used to store historical data, periodic effective values, control judgment results, valve group action results, gas source switching events and abnormal alarms. When an alarm is triggered, it is associated with the archived real-time image inside the busbar drum of the corresponding collection period to support fault tracing and operation auditing.

[0053] The above formulas are all dimensionless calculations. The formulas are derived from software simulations based on a large amount of collected data to obtain the most recent real-world results. The preset parameters and thresholds in the formulas are set by those skilled in the art according to the actual situation.

[0054] Those skilled in the art will recognize that the modules and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0055] In conclusion, the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A control method for an offline busbar anti-condensation and moisture-proof protection system, characterized in that, Includes the following steps: S1. Collect data on the internal pressure of the busbar drum, the internal humidity of the busbar drum, the main gas source supply pressure, the surface humidity of the insulators and conductors, the ambient humidity around the insulators and conductors, and real-time images of the inside of the busbar drum according to the collection cycle, and generate data validity labels; prepare dry and clean gas and generate gas availability labels. S2. When the data validity identifier is valid and the gas availability identifier is available, determine the availability of the main gas source and confirm it after a delay. Switch between the main gas source channel and the backup gas source channel according to the determination result, and generate a gas source stability identifier after parallel transition during the switchback. S3. When the gas source stability indicator is stable, control the start and stop of the gas supply valve according to the internal pressure and humidity of the busbar drum, and confirm the pressure response after start and stop. If there is an abnormality, generate a gas supply abnormality indicator or a pressure stagnation abnormality indicator respectively. S4. In standby mode, generate a condensation risk indicator and confirm it in conjunction with the real-time image inside the busbar drum; when triggered, force air supply and generate a protection effect indicator; close the air supply valve when the exit conditions are met, and generate a forced protection abnormality indicator if the timeout is exceeded.

2. The control method for an offline busbar anti-condensation and moisture-proof protection system according to claim 1, characterized in that, Also includes: S5. Display and record collected data, control status, and various indicators, and provide alarm and traceability functions; The system executes S1–S4 cyclically according to the data collection cycle and performs self-verification. If it fails, it is downgraded to ensure the goals of preventing condensation and moisture are achieved.

3. The control method for an offline busbar anti-condensation and moisture-proof protection system according to claim 1, characterized in that, S1 specifically includes: A data acquisition cycle is set, and the internal pressure, humidity, main air supply pressure, surface humidity of insulators and conductors, ambient humidity around insulators and conductors, and real-time images of the busbar drum are collected synchronously according to the acquisition cycle. Periodic valid values ​​are generated for the internal pressure and humidity of the busbar drum. Missing, out-of-range, and jump checks are performed on the periodic valid values ​​to generate data validity identifiers. The compressed air to be fed into the busbar drum is sequentially subjected to freeze drying, micro-thermal adsorption drying, and multi-stage filtration, and a gas availability identifier is generated based on the outlet dew point temperature and dew point temperature threshold.

4. The control method for an offline busbar anti-condensation and moisture-proof protection system according to claim 1, characterized in that, S2 specifically includes: Under the condition that the data validity indicator is valid and the gas availability indicator is available, the availability of the main gas source is determined based on the periodic valid value of the main gas source supply pressure; when the availability of the main gas source is determined to be unavailable and continues to reach the preset delay, the main gas source channel is closed and the backup gas source channel is opened; when the availability of the main gas source is restored to available, the main gas source channel is switched back, and the backup gas source channel is closed after the main gas source channel and the backup gas source channel supply gas in parallel for a preset transition time, and a gas source stability indicator is generated at the same time.

5. The control method for an anti-condensation and moisture-proof protection system for an offline busbar according to claim 1, characterized in that, S3 specifically includes: Under the condition that the gas availability indicator is available and the gas source stability indicator is stable, routine start-up and routine shutdown judgments are made based on the effective value of the internal pressure cycle and the effective value of the internal humidity cycle of the busbar. When the routine start-up judgment is continuously satisfied and the gas supply valve is in the closed state, the gas supply valve is opened to enter the gas supply operation state, and the pressure rise response after opening is confirmed. If the confirmation is not passed, a gas supply abnormality indicator is generated.

6. The control method for an anti-condensation and moisture-proof protection system for an offline busbar according to claim 5, characterized in that, When the normal shutdown criteria are met continuously and the air supply valve is in the open state, the air supply valve is closed and the system enters standby mode. The system then confirms the pressure drop response after shutdown. If the confirmation fails, a pressure retention anomaly is generated.

7. The control method for an offline busbar anti-condensation and moisture-proof protection system according to claim 1, characterized in that, S4 specifically includes: In the standby state where the air supply valve is closed and the normal start-up criteria are not met, a condensation risk indicator is generated based on the surface humidity of the insulators and conductors and the ambient humidity around the insulators and conductors. The pixel ratio of the suspected condensation area is extracted from the real-time image inside the busbar for auxiliary confirmation. When the condensation risk indicator meets the forced protection triggering conditions, the air supply valve is forcibly opened to enter the forced protection operation state, and a protection effect indicator is generated based on the change in the pixel ratio of the suspected condensation area. When the exit conditions are met and the preset number of cycles is met continuously, the air supply valve is closed to return to the standby state from the forced protection operation state. If the exit conditions are not met within the preset maximum continuous forced protection operation time, a forced protection abnormality indicator is generated.

8. The control method for an anti-condensation and moisture-proof protection system for an offline busbar according to claim 2, characterized in that, S5 specifically includes: The system centrally displays the internal pressure and humidity of the busbar drum, the main gas supply pressure, the gas source channel status, the gas supply valve status, and various indicators along with real-time images of the busbar drum's interior. It records the original data, valid values, and judgment and action results according to the acquisition cycle. In case of an anomaly, an alarm is triggered and the real-time images of the busbar drum's interior corresponding to the acquisition cycle are archived. The controller is continuously powered on and executes S1–S4 in a cyclical manner according to the acquisition cycle. It performs a consistency self-check on the gas availability indicator, gas source stability indicator, and condensation risk indicator. If the self-check fails, a degradation strategy is implemented to prioritize the anti-condensation and moisture-proof safety objectives of the offline busbar.

9. A condensation and moisture protection system for an offline busbar, comprising the control method of any one of claims 1-8 for a condensation and moisture protection system for an offline busbar, characterized in that, include: The air source drying unit is used to dry and purify the compressed air that is fed into the busbar drum of the offline busbar and output dry and clean gas. The intelligent control and gas supply unit is connected to the outlet of the gas source drying and treatment unit. It is used to send dry and clean gas into the busbar and realize gas source selection, gas supply start and stop and protection control. The monitoring and imaging unit is used to perform imaging monitoring of key areas inside the busbar drum that are prone to condensation and to output real-time images of the inside of the busbar drum. The human-machine interaction unit communicates with the controller and is used for centralized display, recording, and alarm functions; the human-machine interaction unit includes at least a display component and an interaction component. The data recording and traceability unit communicates with the controller and is used to store historical data, periodic effective values, control judgment results, valve group action results, gas source switching events, and abnormal alarms.

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