A low-voltage power supply control method suitable for a humid environment of a pig house

Abstract

The application discloses a low-voltage power supply control method suitable for a humid environment of a pig house, and relates to the technical field of low-voltage power supply and electrical safety control of livestock and poultry farms. A pig house environment control host reads pig house layout, humid risk partition, low-voltage branch, load level, leakage detection and recovery verification version, and a centralized power supply box limits 220V alternating current in a dry area and outputs 24V and 48V low-voltage branches to a stall area, a drinking water area, a manure ditch area and a wet curtain area; power-on verification is performed on each low-voltage branch, output voltage, terminal voltage, residual current, junction box humidity, condensation contact and load self-checking feedback are collected; humid events are registered according to flushing, spraying, wet curtain, drinking water and ditch feedback, and branch states are registered in combination with branch feedback; low-voltage maintenance, standby branch takeover, time-delay power supply, disconnection control and recovery power supply are executed according to the load level. The method can distinguish between starting impact, humid basic leakage, short-time water entry anomaly and continuous insulation anomaly.

Description

Technical Field

[0001] This invention relates to the field of low-voltage power supply and electrical safety control technology for livestock and poultry farms, specifically a low-voltage power supply control method adapted to the humid environment of pigsties. Background Technology

[0002] In pigsties, drinking water pipelines, sprinkler cooling systems, wet curtain ventilation, manure ditches, and flushing operations coexist for extended periods. Metal components in the pens, water film on the floor, and low-level cable trays easily create a damp and conductive environment. Currently, most pigsties use 220V AC power directly to supply fans, lighting, feeding, manure removal, and environmental control equipment. Some renovation plans will use 24V or 48V low-voltage power on certain equipment within the pigsty to reduce the risk of electric shock to animals when they come into contact with live parts.

[0003] However, existing low-voltage solutions typically only reduce the power supply voltage of individual devices without establishing branch-level power supply control that considers pigpen layout, damp areas, animal access locations, and load importance. During pigpen flushing, spraying, and high-humidity operation, low-level branches may experience foundation leaks due to increased humidity, short-term leakage spikes caused by water ingress into junction boxes, current surges due to load startup, and persistent insulation abnormalities caused by cable aging. Existing fixed leakage protection systems tend to treat all of these conditions as faults and cut off power, causing interruptions to critical loads such as ventilation, watering, and feeding. If the tripping threshold is increased to reduce false trips, the faulty branch in animal-accessible areas may remain energized. Therefore, in humid pigpen environments, a power supply control method is still lacking that can identify branch dampness anomalies and selectively limit, isolate, and restore current to 24V and 48V low-voltage branches. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a low-voltage power supply control method adapted to the humid environment of pigsties, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a low-voltage power supply control method adapted to the humid environment of pigsties, comprising the following steps: S1. The pigsty environmental control host reads the pigsty layout version, damp risk zone version, low-voltage branch version, load level version, leakage detection configuration version and recovery verification configuration version. The centralized power supply box limits the 220V AC power to the dry area electrical control area and outputs 24V and 48V low-voltage branches to the pigsty pen area, drinking water area, manure ditch area and wet curtain area. S2. Based on the low-voltage branch version, perform power-on verification for each low-voltage branch, and collect feedback from the branch controller online, output voltage, end voltage, residual current, junction box humidity, condensation contact, and end load self-test. S3. Based on the feedback from the flushing pump, flushing water gun solenoid valve, spray solenoid valve, wet curtain water pump, drinking water pipe pressure and drainage ditch liquid level, register the damp events and associate the damp events with the corresponding damp risk zone and low pressure branch. S4. Based on the residual current feedback, end voltage feedback, junction box humidity feedback, condensation contact feedback, load start-up feedback and humidity event of the low-voltage branch, register the low-voltage branch as start-up observation state, stable power supply state, humidity observation state, alarm power supply state, current-limiting power supply state and isolation power-off state. S5. Based on the load level version and low-voltage branch status, perform low-voltage maintenance power supply and backup branch takeover for continuous maintenance loads, perform delayed power supply for delayed maintenance loads, perform disconnection control for operational loads, and restore power supply after the isolated power-off branch meets the conditions of humidity drop, condensation relief, low energy detection, no-load test supply, load test supply, and load self-test.

[0006] Furthermore, in S1:

[0007] The pigsty layout version registers the building number, pen number, drinking nipple location, manure ditch boundary, wet curtain location, centralized power supply box location, and low-voltage junction box installation height. The damp risk zoning version registers the damp risk zoning zone number, spatial boundary, main water source, drainage direction, water retention point, and animal-accessible boundary.

[0008] Furthermore, in S1:

[0009] The low-voltage branch version registers the branch number, bus voltage level, centralized power supply box output port, end control address, end load number, junction box area code, and branch allowable load list, and limits each low-voltage branch to a moisture risk zone.

[0010] Furthermore, in S2:

[0011] The power-on verification process compares the branch number, bus voltage level, centralized power supply box output port, end control address, end load number, and junction box area code with the low-voltage branch version item by item. If any item is inconsistent, the corresponding low-voltage branch shall be prohibited from being closed.

[0012] Furthermore, in S2:

[0013] When the online feedback, output voltage feedback, terminal voltage feedback, residual current feedback, junction box humidity feedback, condensation contact feedback, and terminal load self-test feedback of the low-voltage branch arrive within the same acquisition cycle and the time scale is continuous, a valid branch sample is formed.

[0014] Furthermore, in S3:

[0015] Dampness events are registered according to the event number, event source, triggering device number, triggering zone number, start time, current stage, associated branch number, and associated load level. The event number is formed by the building number, dampness risk zone number, event type number, and start time sequence number.

[0016] Furthermore, in S4:

[0017] After the low-voltage branch is closed, it enters the start-up observation state. During the start-up observation period, when the terminal voltage returns to the load nameplate's permissible range, the residual current feedback does not reach the short-term peak boundary, and the terminal load self-test passes, the low-voltage branch enters the stable power supply state.

[0018] Furthermore, in S4:

[0019] When a low-voltage branch is associated with a moisture event under stable power supply conditions, it enters a moisture observation state. When the humidity feedback of the junction box enters the moisture observation range, the condensation contact is disconnected, and the residual current feedback reaches the warning boundary, the low-voltage branch enters a warning power supply state.

[0020] Furthermore, in S5:

[0021] After a low-voltage branch carrying a continuous holding load enters a current-limited power supply state, a backup branch with the same voltage level and load interface as the low-voltage branch but located in a different low-voltage junction box is called, and the continuous holding load is transferred to the backup branch for power supply.

[0022] Compared with the prior art, the present invention provides a low-voltage power supply control method adapted to the humid environment of pigsties, which has the following beneficial effects: 1. This invention addresses the difficulty in identifying low-voltage branch leakage caused by the combined effects of pigsty flushing, spraying, wet curtain operation, drinking water dripping, and manure ditch dampness. It uses pigsty layout, dampness risk zoning, low-voltage branch, load level, leakage detection configuration, and recovery verification configuration as the basis for power supply control. After branch power-on verification, it collects end voltage, residual current, junction box humidity, condensation contacts, load start feedback, and dampness event feedback. Based on this, it registers the low-voltage branch's start observation status, stable power supply status, dampness observation status, warning power supply status, current-limiting power supply status, and isolation power-off status. This allows for differentiation between load start-up impact, damp foundation leakage, short-term water ingress anomalies, and continuous insulation anomalies, avoiding false tripping of the entire pigsty due to fixed leakage protection alone, and preventing abnormal branches in animal-accessible areas from remaining energized to reduce false tripping. 2. This invention implements tiered power supply control based on continuous holding loads, time-delay holding loads, and operational loads. When an abnormal branch enters a current-limited power supply state, the continuous holding load is transferred to a backup branch with the same voltage level, the same load interface, and located in a different low-voltage junction box. Power is restored to the isolated power-off branch after it meets the conditions for humidity reduction, condensation resolution, low energy detection, no-load test, load test, and end-load self-test. This method confines the humidity fault to a specific low-voltage branch, maintaining the continuous operation of critical loads such as ventilation low-voltage interlocking, drinking water monitoring, and alarm communication. It also provides a clear detection sequence and feedback basis for faulty branch recovery, reducing the safety risks associated with manual reversing of circuit breakers. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a low-voltage power supply control method adapted to the humid environment of a pigsty according to the present invention. Detailed Implementation

[0024] 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.

[0025] Example: Figure 1 A low-voltage power supply control method adapted to the humid environment of pigsties is presented, which involves performing the following steps in sequence: S1. The pigsty environmental control host reads the pigsty layout version, damp risk zone version, low-voltage branch version, load level version, leakage detection configuration version and recovery verification configuration version. The centralized power supply box limits the 220V AC power to the dry area electrical control area and outputs 24V and 48V low-voltage branches to the pigsty pen area, drinking water area, manure ditch area and wet curtain area. S2. Based on the low-voltage branch version, perform power-on verification for each low-voltage branch, and collect feedback from the branch controller online, output voltage, end voltage, residual current, junction box humidity, condensation contact, and end load self-test. S3. Based on the feedback from the flushing pump, flushing water gun solenoid valve, spray solenoid valve, wet curtain water pump, drinking water pipe pressure and drainage ditch liquid level, register the damp events and associate the damp events with the corresponding damp risk zone and low pressure branch. S4. Based on the residual current feedback, end voltage feedback, junction box humidity feedback, condensation contact feedback, load start-up feedback and humidity event of the low-voltage branch, register the low-voltage branch as start-up observation state, stable power supply state, humidity observation state, alarm power supply state, current-limiting power supply state and isolation power-off state. S5. Based on the load level version and low-voltage branch status, perform low-voltage maintenance power supply and backup branch takeover for continuous maintenance loads, perform delayed power supply for delayed maintenance loads, perform disconnection control for operational loads, and restore power supply after the isolated power-off branch meets the conditions of humidity drop, condensation relief, low energy detection, no-load test supply, load test supply, and load self-test.

[0026] S1 is specifically implemented as follows:

[0027] When the low-voltage power supply control starts, the pigsty environmental control host reads the pigsty layout version, damp risk zone version, low-voltage branch version, load level version, leakage detection configuration version, and recovery verification configuration version. The pigsty layout version is derived from the pigsty as-built drawings, pen layout acceptance forms, drinking water line installation acceptance forms, manure ditch location acceptance forms, evaporative cooling pad installation acceptance forms, and flushing water gun connection point acceptance forms. The version records the building number, pen row number, drinking nipple location, manure ditch boundary, passage boundary, evaporative cooling pad location, sprinkler pipeline location, centralized power supply box location, and low-voltage junction box installation height.

[0028] The damp risk zoning version is derived from flushing tests, spray tests, wet curtain operation tests, and drinking water line water supply tests. This version records the zone number, boundaries, main water source, drainage direction, water accumulation points, and animal-accessible boundaries for the enclosure area, drinking water area, manure ditch area, wet curtain area, and passageway area. The low-voltage branch version is derived from electrical construction records, cable laying records, branch port tables, end-load nameplates, and power-on acceptance records. This version records the branch number, bus voltage level, cable specifications, cable length range, centralized power supply box output port, end-control address, end-load number, junction box protection level, and branch allowable load list.

[0029] The load level version is derived from the breeding process documents, equipment nameplates, environmental control interlock acceptance forms, and power outage impact test forms. Alarm communication, drinking water pressure monitoring, and ventilation low-pressure interlock are registered as continuous holding loads, feeding valve control, curtain control, and local sensor nodes are registered as delayed holding loads, and flushing auxiliary lighting, maintenance plug-in terminals, and manure cleaning auxiliary actuator terminals are registered as operational loads.

[0030] The leakage current detection configuration version is derived from no-load drying power-on records, load-balanced stable operation records, flushing simulation records, spraying simulation records, and wet curtain operation records. This version records the warning boundary, isolation boundary, short-term peak boundary, startup observation period, stable power supply observation period, and damp event observation period for each low-voltage branch. The recovery verification configuration version is derived from branch isolation test, junction box drying recovery test, load self-test test, and manual verification and acceptance records. This version records the recovery prerequisites, low energy detection duration, no-load test duration, load test duration, and number of repeated failure lockouts. After the above versions are read, the range of the centralized power supply box connected to 220V AC power is limited to the dry area electrical control zone. The dry area electrical control zone is jointly defined by the location of the centralized power supply box, the flushing water arrival boundary, and the wet curtain water boundary in the pigsty layout version.

[0031] The low-level control branches in the pigpen area, drinking water area, manure ditch area, and within the reach of animals use 24V DC output; the branches in the wet curtain area, the high-level corridor area, and the sealed control boxes far from the centralized power supply box use 48V DC output, which is converted to 24V DC in the terminal control box before being connected to the low-level sensors and low-level actuators. The main power circuits of high-power fans, water pumps, and heating equipment are not included in the low-voltage branch output; only their control feedback, interlock feedback, and fault feedback are connected to the pigpen environmental control host.

[0032] Before the centralized power supply box outputs, it reads the box door magnet, internal humidity, water leakage contact, input protector feedback, 24V bus feedback, 48V bus feedback, and box grounding feedback. When the box door magnet is closed, the water leakage contact is open, the bus feedback is valid, and the grounding feedback is valid, it enters the branch power-on verification process. When the box door magnet is open, the water leakage contact is conductive, the bus feedback is missing, or the grounding feedback is abnormal, all low-voltage branches remain disconnected, and only alarm communication and branch detection power are retained.

[0033] S2 is specifically implemented as follows:

[0034] The pigsty environmental control host performs power-on verification on each low-voltage branch according to the low-voltage branch version. The power-on verification starts from the output port of the centralized power supply box and reads the branch controller online feedback, output relay feedback, output voltage feedback, residual current feedback, terminal voltage feedback, junction box humidity feedback, condensation contact feedback, and terminal load self-test feedback according to the branch number registered in the low-voltage branch version.

[0035] The feedback from the branch controller online comes from the low-voltage branch controller in the centralized power supply box; the output relay feedback comes from the contact feedback at the branch output terminal; the output voltage feedback comes from the voltage detection point at the port of the centralized power supply box; the residual current feedback comes from the residual current detection module of the branch; the terminal voltage feedback comes from the voltage detection point in the terminal control box; the junction box humidity feedback comes from the humidity detector in the low-voltage junction box; the condensation contact feedback comes from the conductive contacts at the bottom of the junction box and near the terminals; and the terminal load self-test feedback comes from the self-test results of the terminal control box on the load terminals, load feedback line, and local communication address.

[0036] The power-on verification data acquisition cycle is 1 second, sourced from the low-voltage branch controller's factory sampling capability and on-site communication acceptance records. A valid branch sample is formed when all feedback from the same branch arrives within the same acquisition cycle and the timescales are continuous. The valid branch sample is then verified for consistency with the low-voltage branch version. Verification items include: consistent branch number, consistent bus voltage level, consistent centralized power supply box port, consistent terminal control address, consistent terminal load number, consistent junction box area code, and consistent load level. When all the above items are consistent, the low-voltage branch enters a standby power-on state.

[0037] When a low-voltage branch has a duplicate branch number, inconsistent bus voltage level, inconsistent terminal control address, inconsistent load number, or inconsistent junction box area code, the branch enters a power-on verification failure state and generates a branch verification failure record. The branch verification failure record registers the branch number, centralized power supply box port, terminal control address, failure item, version registration value, field read value, verification time, and processing action. The processing action is limited to prohibiting closing, retaining the detection power supply, and outputting maintenance prompts. If feedback is missing, it is not replaced by feedback from adjacent branches, nor is the terminal voltage replaced by the centralized power supply box port voltage.

[0038] A single missing data point causes the low-voltage branch to enter a sampling pending state. If the same feedback is missing for three consecutive sampling cycles, it enters a detection failure state. A branch in a detection failure state is not allowed to enter a standby power supply state. When this branch carries a continuous holding load, the pigsty environmental control host reads the backup branch registered in the low-voltage branch version. After confirming that the backup branch's voltage level, load interface, junction box area number, and detection status are consistent, the continuous holding load is transferred to the backup branch. When this branch carries a time-delay holding load or a work-type load, the load remains disconnected.

[0039] After the power-on verification is completed, a power-on verification record is generated for each low-voltage branch. The record includes the effective sampling time, branch status, closing permission, backup branch reference number, and reason for failure. Subsequent moisture event association and branch status registration are based on this power-on verification record.

[0040] S3 is implemented as follows:

[0041] After the pigsty environmental control host completes the power-on verification on the branch circuit, it collects feedback on dampness events and associates these events with the dampness risk zone and low-voltage branch circuit. The sources of dampness event feedback include the flushing pump start / stop contacts, flushing water gun solenoid valve feedback, spray solenoid valve feedback, evaporative cooling pad pump feedback, drinking water pipe pressure switch, drainage ditch level switch, junction box humidity detector, junction box condensation contacts, and manual flushing button.

[0042] All feedback above comes from signals from collectable devices, and is not based on verbal descriptions of dampness events. A flushing event is recorded when the flushing pump is running and the flushing gun solenoid valve is in the open feedback state; a spraying event is recorded when the spray solenoid valve is in the open feedback state and the spray pipeline location matches the spray coverage area in the dampness risk zone version; a wet curtain event is recorded when the evaporative cooling pad pump is running feedback and the evaporative cooling pad area humidity detector enters the water-carrying registration range; a drinking water anomaly event is recorded when the drinking water pipe pressure switch generates a pressure drop feedback and the humidity feedback of the junction box in the same dampness risk zone increases; a ditch level switch generates a level feedback and the humidity feedback of the junction box in the ditch area increases.

[0043] Each dampness event record includes the event number, event source, triggering device number, triggering zone number, start time, current stage, associated branch number, and associated load level. The event number is formed by the building number, dampness risk zone number, event type number, and start time sequence number to avoid confusion between multiple dampness events at the same time. When a dampness event is associated with a low-voltage branch, the pigsty environmental control host reads the spatial boundary in the dampness risk zone version and the junction box zone number in the low-voltage branch version, registering low-voltage branches within the same zone number that have passed power-on verification as associated branches. If a branch crosses two dampness risk zones, it is registered as an unqualified branch in the low-voltage branch version and will not enter the automatic power supply process.

[0044] After a damp event transitions from the initial stage to the operational stage, the branch containing the work-related load enters the work prohibition control, delaying the load from adding new actions while continuously maintaining power supply to the load for monitoring. The damp event ends when four conditions are simultaneously met: the triggering device stops feedback, the humidity feedback at the associated junction box stops increasing, the condensation contact opens, and the drain level feedback is released. If the triggering device stops but the humidity at the junction box remains within the damp observation range, the damp event enters the residual moisture stage.

[0045] During the residual moisture phase, operational loads remain disconnected, delayed-hold loads are only allowed to complete a safe closing action, and continuous-hold loads maintain low-voltage power supply and enter the moisture observation phase. When a moisture event record is missing, the pigsty environmental control host does not treat the relevant zone as a dry area, but instead processes the low-voltage branch in the same zone according to the moisture observation rules; when feedback from the same event source is missing for three consecutive collection cycles, a moisture event collection failure record is registered, recording the triggering device number, missing feedback item, associated zone number, processing action, and maintenance prompt.

[0046] S4 is implemented as follows:

[0047] The pigsty environmental control host registers the status of low-voltage branches based on residual current feedback, terminal voltage feedback, junction box humidity feedback, condensation contact feedback, load start-up feedback, and humidity events. Status registration uses branch power-on verification records, humidity event records, and real-time valid branch sampling as inputs. Branch status is limited to start-up observation state, stable power supply state, humidity observation state, warning power supply state, current-limited power supply state, and isolation power-off state.

[0048] After the pigsty environmental control host sends a closing command to the branch to be powered and receives feedback from the closed output relay, the branch enters the start-up observation state. The start-up observation period is registered by the leakage current detection configuration version. 5 seconds is used for low-pressure solenoid valves, sensor nodes and small actuators, and 15 seconds is used for roller shutter actuators. The above times are obtained from the equipment nameplate, no-load start-up acceptance record, load start-up acceptance record and end voltage recovery acceptance record.

[0049] During the initial observation period, the branch enters a stable power supply state when the branch current feedback increases, the terminal voltage returns to the load nameplate's permissible range within the observation period, the residual current feedback does not reach the short-term peak boundary, and the terminal load self-test feedback passes. The terminal voltage permissible range is derived from the load nameplate; if the nameplate does not provide a permissible range, the equipment supplier's commissioning documents and power-on acceptance records serve as the registration basis, and automatic closing is not allowed if no record is made.

[0050] Under stable power supply conditions, once a related humidity event occurs, the branch enters a humidity observation state. During the humidity observation state, the branch enters a warning power supply state when the junction box humidity enters the humidity observation range, the condensation contact opens, the residual current feedback reaches the warning boundary but not the isolation boundary, and the terminal voltage remains within the load nameplate's permissible range. The warning boundary is derived from no-load dry power-on records, load-stable operation records, and humidity simulation records. The registration criteria are: no triggering in dry environment, identifiable humidity simulation, and no false triggering under load.

[0051] When the residual current feedback reaches the short-time peak boundary, the junction box humidity is within the damp observation range, the condensation contact is open, and the terminal voltage experiences a short-term drop and recovers within the short-term review period, the branch carrying the continuously maintained load enters the current-limiting power supply state. The short-time peak boundary is derived from junction box splash simulation, flushing simulation, and load start-up records, used to distinguish between short-term water ingress anomalies and normal start-up impacts. When the residual current feedback reaches the isolation boundary and does not exit within the review period, the condensation contact is open accompanied by a drop in terminal voltage, and the branch remains in the alert power supply state after the damp event ends, and the same branch repeatedly enters the alert power supply state within the same shift and fails to recover from the observation, the branch enters the isolation power-off state.

[0052] The isolation boundary is derived from branch insulation acceptance, fault simulation, and protector operation acceptance records. Each state change generates a branch state change record, recording the branch number, previous state, current state, trigger feedback, trigger time, executed action, action feedback, and associated moisture event number. During communication interruption, the centralized power supply box controller maintains the existing continuous power supply to the load and executes the triggered isolation disconnection, without executing new closing or restoration test. After communication is restored, the pigsty environmental control host reads the local state record and branch output feedback from the centralized power supply box controller. If they match, automatic control continues; if they do not match, the branch enters manual verification mode.

[0053] S5 is implemented as follows:

[0054] The pigsty environmental control host performs graded power supply, backup branch connection, and power restoration based on the load level version and low-voltage branch status. It continuously maintains low-voltage power supply to the load under stable power supply and damp observation conditions. Under alert power supply conditions, it increases the data collection frequency and prohibits the connection of loads operating in the same area. Under current-limited power supply conditions, it reads the backup branches registered in the low-voltage branch version. The inputs for backup branch connection include the backup branch number, backup branch voltage level, backup branch junction box area code, backup branch detection status, target load interface, and current load status of the backup branch.

[0055] When the backup branch and the abnormal branch have the same voltage level, the same load interface, but different low-voltage junction boxes, and the backup branch is not in a wet observation state, a warning power supply state, or an isolated power-off state, the load is continuously switched to the backup branch, the abnormal branch disconnects its main output, and retains a low-power detection power supply. When the backup branch is unavailable, the load is continuously kept under current-limited power supply, and a maintenance prompt with an area code is output. After a delay, the load stops adding new operations, and the work-related load remains disconnected.

[0056] The delayed power supply maintains the load's operation according to the production process under stable power supply conditions, and records the delayed power supply during the damp observation and alert power supply states. Roller shutters, air valves, and feed valves that are already in the middle of their operation stop after completing the safe closing action, and loads that have not yet started operation are delayed. Work-related loads are disconnected at the beginning, operation, and residual moisture stages of a damp event; work-related loads only enter the power supply permission process when the damp event ends, the associated branch returns to a stable power supply state, and the work permission port is valid.

[0057] Before power is restored to the isolated power-off branch, the pigsty environmental control host reads the isolation record, humidity event record, junction box humidity feedback, condensation contact feedback, residual current feedback, terminal voltage feedback, terminal load self-test feedback, and restore verification configuration version. The prerequisites for restoration are: the associated humidity event has ended, the residual humidity stage has ended, the junction box humidity is out of the humidity observation range, the condensation contact is continuously disconnected, the branch controller is online, the terminal control box is online, and the maintenance door magnet is closed.

[0058] After the preconditions for recovery are met, the branch enters the recovery detection state. First, it outputs a low-energy detection power supply, which is only used to read the feedback of the end control box, end voltage, and residual current, and does not drive the load. After the low-energy detection is passed, an unloaded test is performed. During the unloaded test, the end load remains disconnected. After the unloaded test is passed, a load test is performed in the order of continuous holding load, delayed holding load, and working load. During the load test, the end voltage, residual current, and load self-test feedback are read after each load is connected.

[0059] After all low-energy detection, no-load test, load test, and load self-test pass, the branch returns to a stable power supply state, and the backup branch is disconnected. A recovery failure record is generated if any recovery step fails, recording the failed step, failure feedback, branch number, load number, failure time, and handling action. If the same branch fails two consecutive recovery attempts, it enters manual review mode. The reason for the two consecutive failures is the protector action limitation registered in the recovery verification configuration version and the on-site maintenance acceptance criteria.

[0060] Under manual verification, the pigsty environmental control host is prohibited from automatic test operation. After on-site maintenance personnel complete the drainage of the junction box, terminal tightening, cable replacement, load inspection, and door magnetic closing, the system will re-enter the recovery testing process. This step ensures that damp foundation leakage, short-term water ingress anomalies, continuous insulation anomalies, and terminal undervoltage are handled separately at the low-voltage branch level, and provides a continuous power supply path for ventilation low-voltage interlocking, drinking water monitoring, and alarm communication during branch failures.

[0061] In this embodiment, the branch feedback acquisition cycle is 1 second, which is derived from the factory sampling capability of the low-voltage branch controller and the on-site communication acceptance records of the pigsty. The start-up observation period for the low-voltage solenoid valve, drinking water pressure monitoring node, and small sensor node is 5 seconds, and the start-up observation period for the roller shutter control node is 15 seconds. The aforementioned periods are derived from the equipment nameplate, no-load start-up acceptance records, load start-up acceptance records, and end voltage recovery records.

[0062] After a damp event, when the humidity of the associated low-voltage junction box falls out of the damp observation range and the condensation contacts remain continuously disconnected for 30 minutes, the recovery testing process can begin. This 30-minute period is derived from the humidity drop records of the junction box after the enclosure flushing test, spray test, and wet curtain operation. The recovery test sequentially performs low-energy testing, no-load test, load test, and end-load self-test. If the same low-voltage branch fails to recover twice consecutively, it enters the manual review state. This number of times is determined by the branch protector's action limit, on-site maintenance acceptance criteria, and safety requirements for repeated test runs.

[0063] The warning boundaries, isolation boundaries, and short-term peak boundaries of each low-voltage branch are registered by the leakage current detection configuration version according to the branch number. The registration is based on the no-load drying power-on record, load stable operation record, flushing simulation record, spraying simulation record, wet curtain water operation record, and fault simulation record of the corresponding branch. These are not used as fixed thresholds across pig houses, across cable lengths, or across load combinations.

[0064] It should be noted that this invention can be deployed on the device itself to realize embedded applications, or it can run on a PC or other terminal with a user interface, thereby meeting various hardware environments and usage requirements.

[0065] The above embodiments can be implemented in whole or in part by software, hardware, firmware, or any other combination. When implemented in software, the above embodiments can be implemented in whole or in part by a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, the processes or functions of the embodiments of this application are implemented in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted wirelessly or wiredly from one website, computer, server, or data center to another website, computer, server, or data center. Wired methods include optical fiber, twisted pair, coaxial cable, etc. Wireless methods include infrared, microwave, etc. Available media include any available media that can be accessed by a computer or data storage devices such as servers and data centers that contain one or more sets of available media. Available media can be magnetic media (floppy disks, hard disks, magnetic tapes), optical media (DVDs), or semiconductor media. Semiconductor media can be solid-state drives.

[0066] The above content is only a specific embodiment of the present invention and is 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 low-voltage power supply control method adapted to the humid environment of pigsties, characterized in that, Perform the following steps in sequence: S1. The pigsty environmental control host reads the pigsty layout version, damp risk zone version, low-voltage branch version, load level version, leakage detection configuration version and recovery verification configuration version. The centralized power supply box limits the 220V AC power to the dry area electrical control area and outputs 24V and 48V low-voltage branches to the pigsty pen area, drinking water area, manure ditch area and wet curtain area. S2. Based on the low-voltage branch version, perform power-on verification for each low-voltage branch, and collect feedback from the branch controller online, output voltage, end voltage, residual current, junction box humidity, condensation contact, and end load self-test. S3. Based on the feedback from the flushing pump, flushing water gun solenoid valve, spray solenoid valve, wet curtain water pump, drinking water pipe pressure and drainage ditch liquid level, register the damp events and associate the damp events with the corresponding damp risk zone and low pressure branch. S4. Based on the residual current feedback, end voltage feedback, junction box humidity feedback, condensation contact feedback, load start-up feedback and humidity event of the low-voltage branch, register the low-voltage branch as start-up observation state, stable power supply state, humidity observation state, alarm power supply state, current-limiting power supply state and isolation power-off state. S5. Based on the load level version and low-voltage branch status, perform low-voltage maintenance power supply and backup branch takeover for continuous maintenance loads, perform delayed power supply for delayed maintenance loads, perform disconnection control for operational loads, and restore power supply after the isolated power-off branch meets the conditions of humidity drop, condensation relief, low energy detection, no-load test supply, load test supply, and load self-test.

2. The low-voltage power supply control method adapted to the humid environment of pigsties according to claim 1, characterized in that, In S1: The pigsty layout version registers the building number, pen number, drinking nipple location, manure ditch boundary, wet curtain location, centralized power supply box location, and low-voltage junction box installation height. The damp risk zoning version registers the damp risk zoning zone number, spatial boundary, main water source, drainage direction, water retention point, and animal-accessible boundary.

3. The low-voltage power supply control method adapted to the humid environment of pigsties according to claim 1, characterized in that, In S1: The low-voltage branch version registers the branch number, bus voltage level, centralized power supply box output port, end control address, end load number, junction box area code, and branch allowable load list, and limits each low-voltage branch to a moisture risk zone.

4. The low-voltage power supply control method adapted to the humid environment of pigsties according to claim 1, characterized in that, In S2: The power-on verification process compares the branch number, bus voltage level, centralized power supply box output port, end control address, end load number, and junction box area code with the low-voltage branch version item by item. If any item is inconsistent, the corresponding low-voltage branch shall be prohibited from being closed.

5. A low-voltage power supply control method adapted to the humid environment of a pigsty according to claim 1, characterized in that, In S2: When the online feedback, output voltage feedback, terminal voltage feedback, residual current feedback, junction box humidity feedback, condensation contact feedback, and terminal load self-test feedback of the low-voltage branch arrive within the same acquisition cycle and the time scale is continuous, a valid branch sample is formed.

6. The low-voltage power supply control method adapted to the humid environment of pigsties according to claim 1, characterized in that, In S3: Dampness events are registered according to the event number, event source, triggering device number, triggering zone number, start time, current stage, associated branch number, and associated load level. The event number is formed by the building number, dampness risk zone number, event type number, and start time sequence number.

7. A low-voltage power supply control method adapted to the humid environment of a pigsty according to claim 1, characterized in that, In S4: After the low-voltage branch is closed, it enters the start-up observation state. During the start-up observation period, when the terminal voltage returns to the load nameplate's permissible range, the residual current feedback does not reach the short-term peak boundary, and the terminal load self-test passes, the low-voltage branch enters the stable power supply state.

8. A low-voltage power supply control method adapted to the humid environment of a pigsty according to claim 1, characterized in that, In S4: When a low-voltage branch is associated with a moisture event under stable power supply conditions, it enters a moisture observation state. When the humidity feedback of the junction box enters the moisture observation range, the condensation contact is disconnected, and the residual current feedback reaches the warning boundary, the low-voltage branch enters a warning power supply state.

9. A low-voltage power supply control method adapted to the humid environment of a pigsty according to claim 1, characterized in that, In S5: After a low-voltage branch carrying a continuous holding load enters a current-limited power supply state, a backup branch with the same voltage level and load interface as the low-voltage branch but located in a different low-voltage junction box is called, and the continuous holding load is transferred to the backup branch for power supply.

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