An intelligent monitoring system for a cable joint fire and explosion protection box

Abstract

The application discloses a kind of intelligent monitoring systems of cable joint fire and explosion protection box, specifically relates to cable safety monitoring technical field, for solving the problem that existing cable joint fire and explosion protection box is dependent on single threshold or parallel sensor alarm, it is difficult to distinguish different abnormal sources such as environment invasion, joint degradation, heat dissipation limitation and sensor failure in semi-closed cavity.By cavity state reference frame, acquisition object and record attribution are limited, form temperature rise evidence piece, environment invasion evidence piece, joint degradation evidence piece and heat dissipation limitation evidence piece, and lock corresponding state according to evidence piece time sequence matching relationship, so that similar monitoring performance caused by damp, joint degradation, heat dissipation limitation and sensor failure is distinguished, to avoid the problem that state source is unclear caused by single threshold alarm.

Description

Technical Field

[0001] This invention relates to the field of cable safety monitoring technology, specifically to an intelligent monitoring system for a fireproof and explosion-proof cable joint protection box. Background Technology

[0002] Cable joints are concentrated areas of insulation restoration, electrical connection, and mechanical fixation in power cable lines. During long-term operation, they are susceptible to factors such as load fluctuations, humidity, external water accumulation, joint construction quality, insulation aging, and changes in heat dissipation conditions. For cable joints located in cable trenches, cable wells, and cable tunnels, fireproof and explosion-proof protection boxes are typically installed on-site to limit the impact of faults in the event of overheating, discharge, combustion, or explosion, reducing damage to adjacent cables and surrounding facilities. With the development of online monitoring technology for power equipment, existing protection boxes or cable joint monitoring systems can now be equipped with detection units for temperature, humidity, water immersion, partial discharge, gas, pressure, and load current. These systems can alert maintenance personnel to the joint's operational status through threshold judgment, status alarms, remote uploads, or platform displays.

[0003] However, fireproof and explosion-proof cable joint protection boxes are not ordinary monitoring points in open environments; they typically have relatively enclosed internal cavities. The cavity structure, sealing method, installation direction, and the environment of the cable well where the protection box is located simultaneously affect the changes in temperature, humidity, gas, and pressure. Changes in line load also alter the heating state of the joint, causing a cross-reaction between temperature rise inside the box and joint deterioration and limited heat dissipation. In actual operation, temperature rise inside the box may be caused by insufficient heat dissipation after increased load, or it may be caused by localized deterioration of the joint; increased humidity inside the box may come from a humid cable well environment, box seal failure, or water immersion; partial discharge signals, gas changes, and pressure disturbances may also be affected by on-site interference, maintenance opening, or sensor status. In other words, when multiple monitoring quantities change within the same period, their surface manifestations are often similar, and it is difficult to accurately determine the source of the anomaly based solely on whether a single value exceeds the limit.

[0004] Existing monitoring methods typically focus on the acquisition of individual sensor values, threshold comparisons, and alarm outputs, or on connecting multiple types of sensors in parallel to a backend system for display. While these methods can detect phenomena such as increased temperature, increased humidity, water immersion triggering, enhanced partial discharge, or gas changes, they struggle to differentiate between environmental intrusion, connector degradation, heat dissipation limitations, and sensor failure states based on the sequential and corresponding relationships between monitoring evidence within the same protective box, connector, and monitoring cycle, especially in semi-enclosed environments. If the source of the anomaly cannot be attributed initially, subsequent verification of sampling objects, sampling frequency, observation windows, and handling actions becomes difficult to establish a targeted basis, easily leading to repeated alarms, unclear handling directions, or discontinuous status records.

[0005] Therefore, in the intelligent monitoring scenario of fireproof and explosion-proof protection boxes for cable joints, the core issue that still needs to be addressed is: how to classify and determine the attribution of monitoring information such as temperature rise, humidity, water immersion, partial discharge, gas, pressure, and load current into the same period's state background under the semi-enclosed cavity operation condition of the protection box, so as to avoid unclear sources of anomalies due to relying solely on single thresholds or parallel sensor alarms, and to provide a clear basis for subsequent verification sampling, graded handling, and continuous status tracking. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides an intelligent monitoring system for fireproof and explosion-proof cable joint protection boxes, thereby solving the problems mentioned in the background section.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an intelligent monitoring system for fireproof and explosion-proof cable joint protection boxes, comprising:

[0008] The cavity reference frame locking module is used to read the protection box number, connector number, cavity structure, load range, previous cycle abnormal state and boundary version, and generate a cavity status reference frame.

[0009] The differential evidence acquisition module is used to acquire the internal temperature, external temperature, internal humidity, external humidity, water immersion signal, partial discharge signal, gas change, pressure perturbation and load current under the limitation of the cavity state reference frame, and generate temperature rise evidence, environmental intrusion evidence, connector deterioration evidence and heat dissipation limitation evidence.

[0010] The anomaly source triage module is used to identify one of the following states based on the temporal matching relationship of evidence fragments: environmental intrusion state, connector deterioration state, heat dissipation limitation state, and sensor failure state.

[0011] The review sampling strategy generation module is used to generate sampling objects, sampling frequency, and observation windows based on the locked state;

[0012] The graded handling record generation module is used to generate graded handling records based on the review and sampling results, including the source of the anomaly, evidence piece number, review strategy number, anomaly level, handling action, and a flag to prevent repeated alarms.

[0013] The boundary write-back module is used to write the operation and maintenance feedback into the next cycle boundary version, and to correct the abnormal traffic splitting conditions, review the sampling priority, and the continuous abnormal count.

[0014] Furthermore, after the monitoring cycle begins, the cavity reference frame locking module is used by the edge monitoring host to read the protection box nameplate, asset ledger, cable joint file, cavity structure registration form, line load monitoring record, previous cycle monitoring record and boundary version library;

[0015] The merging is completed in the order of protection box number, connector number, cavity structure, load range, abnormal state of the previous cycle, and boundary version, and the cavity status reference frame is written to the local record area.

[0016] Furthermore, after reading the cavity status reference frame, the differential evidence acquisition module limits the acquisition objects to the bound protection box number and connector number.

[0017] The data is collected in the following order: internal temperature, external temperature, internal humidity, external humidity, water immersion signal, partial discharge signal, gas change, pressure perturbation, and load current. Time alignment, invalid record removal, and short-term completion are then performed sequentially.

[0018] Furthermore, the differential evidence acquisition module combines the internal temperature, external temperature, and load current to form a temperature rise evidence sheet;

[0019] The humidity inside the box, the humidity outside the box, and the water immersion signal are combined to form a piece of evidence of environmental intrusion.

[0020] Partial discharge signal, gas changes, pressure perturbation and internal temperature are combined to form evidence of connector degradation.

[0021] The internal temperature, external temperature, load current, and cavity structure are combined to form evidence of limited heat dissipation.

[0022] Furthermore, after each piece of evidence is recorded, the anomaly source diversion module verifies the protection box number, connector number, cavity status reference frame number, and boundary version.

[0023] Records from the same period are merged according to their formation time to form a temporal matching relationship of evidence pieces that includes formation time, duration interval, and adjacent change direction.

[0024] Furthermore, the anomaly source triage module locks down a state based on the temporal matching relationship of evidence pieces, in the order of environmental intrusion state, connector deterioration state, heat dissipation limitation state, and sensor failure state.

[0025] It also generates a status lock record that includes the evidence piece number, lock status, boundary version, and formation time.

[0026] Furthermore, the verification sampling strategy generation module reads the lock status from the state lock record;

[0027] The sampling object is determined by the locked status;

[0028] Obtain the sampling frequency and observation window from the boundary version;

[0029] Environmental intrusion status corresponds to humidity inside the box, humidity outside the box, and water immersion signals;

[0030] The deterioration state of the connector corresponds to partial discharge signal, gas changes, pressure perturbations, and internal temperature.

[0031] The corresponding temperature inside the box and outside the box, as well as the load current, are under the condition of limited heat dissipation.

[0032] The sensor failure state corresponds to the marked sensing unit and the same type of reference measurement point.

[0033] Furthermore, after the observation window ends, the graded treatment record generation module reads the review sampling results, which are the review records formed by the sampled object under the limitations of sampling frequency and observation window.

[0034] Verify the protection box number, connector number, and verification strategy number;

[0035] Inherit the locked state as the source of the anomaly and generate a hierarchical handling record containing evidence fragment number, review strategy number, anomaly level, handling action, and a flag to prevent repeated alarms.

[0036] Furthermore, after the hierarchical handling record is formed, the boundary write-back module receives operation and maintenance feedback after the handling action is executed;

[0037] Verify the protection box number, connector number, and classification and handling record;

[0038] Write the maintenance feedback into the next cycle boundary version;

[0039] It also corrected the abnormal diversion conditions, reviewed the sampling priority, and the continuous abnormal count.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] 1. The cavity reference frame locking module first reads the protection box number, connector number, cavity structure, load range, previous cycle abnormal state, and boundary version to generate a cavity state reference frame. Then, the differential evidence acquisition module generates temperature rise evidence pieces, environmental intrusion evidence pieces, connector deterioration evidence pieces, and heat dissipation limitation evidence pieces under the constraints of the cavity state reference frame. The anomaly source diversion module locks one of the environmental intrusion state, connector deterioration state, heat dissipation limitation state, and sensor failure state according to the temporal matching relationship of the evidence pieces. This achieves the goal of classifying and distinguishing similar monitoring performance caused by moisture, connector deterioration, heat dissipation limitation, and sensor failure in the semi-enclosed operation scenario of the cable connector fireproof and explosion-proof protection box, avoiding the problem of unclear state source caused by relying solely on single threshold or parallel sensor alarms.

[0042] 2. The sampling strategy generation module generates sampling objects, sampling frequency, and observation windows based on the locked status. Then, the graded handling record generation module generates graded handling records based on the sampling results, including the source of the anomaly, evidence piece number, review strategy number, anomaly level, handling action, and a flag to prevent repeated alarms. The boundary write-back module writes the operation and maintenance feedback into the next cycle boundary version, correcting the anomaly diversion conditions, review sampling priority, and continuous anomaly count. This ensures that the status lock, review handling, and on-site feedback of the current cycle can be continuously transmitted to the next monitoring cycle, reducing repeated alarms and isolated handling. This makes the protection box operation status monitoring a traceable, verifiable, and continuously correctable closed-loop management process. Attached Figure Description

[0043] Figure 1 A schematic diagram showing the layout of the on-site monitoring equipment for the protection box;

[0044] Figure 2 A schematic diagram of the formation of the cavity state reference frame;

[0045] Figure 3 A logical diagram illustrating the formation of differential evidence pieces;

[0046] Figure 4 This is a schematic diagram for determining the source of anomalies.

[0047] Figure 5 A schematic diagram was created to verify the sampling strategy and tiered treatment records;

[0048] Figure 6 This diagram illustrates the closed loop for operation and maintenance feedback and the write-back of the next cycle boundary version. Detailed Implementation

[0049] 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.

[0050] Example: Combined with Appendix Figures 1-6 This embodiment provides an intelligent monitoring system for fireproof and explosion-proof cable joint protection boxes, including:

[0051] The cavity reference frame locking module is used to read the protection box number, connector number, cavity structure, load range, previous cycle abnormal state, and boundary version to generate a cavity status reference frame. The specific implementation is as follows:

[0052] At the start of each monitoring cycle, the system first establishes a cavity status reference frame for that cycle. The execution entity is the edge monitoring host installed in the monitoring cabinet in the cable trench, cable well, or cable tunnel. Field sources include protection box nameplates, asset ledgers, cable joint files, cavity structure registration forms, line load monitoring records, and monitoring records from the previous cycle.

[0053] The protection box number is a field identification number fixed to a single fireproof and explosion-proof protection box. It is obtained through manual entry and confirmation via the box's QR code, RFID tag, or nameplate. The same protection box number corresponds to one physical box and cannot be automatically supplemented or replaced by the system. If the protection box number is missing, duplicated, or inconsistent with the asset ledger, no cavity status baseline frame will be generated for this period, and a record to be verified will be formed.

[0054] The connector number is the identification number of the protected cable connector inside the protection box. It is collected through cable connector files, construction acceptance records and on-site tags. The connector number should be bound to the protection box number. If a protection box corresponds to multiple connectors, corresponding binding records should be established separately. If the connector number cannot be confirmed, only the on-site collection trace is retained and transferred to the pending supplementary recording, and it will not be called in the subsequent differential evidence collection module.

[0055] The cavity structure refers to the physical structure of the protective box, including at least the cavity volume, box material, sealing method, and installation direction. The cavity volume is in liters, the box dimensions are in millimeters, the sealing method is recorded as snap-fit, bolt-tightening, or glue-sealing as registered on site, and the installation direction is recorded as horizontal, vertical, or inclined installation. The cavity structure is obtained from the commissioning and acceptance data and on-site verification photos. If non-critical fields are missing in the cavity structure registration, they can be supplemented according to the audited structure registration of the same model of protective box, and the source of the supplementation should be indicated. Fields involving cavity volume and sealing method should not be automatically supplemented.

[0056] The load range is the operating range of the line load current corresponding to the current monitoring cycle, in amperes. It comes from the records of the distribution automation system, ring main unit monitoring unit or cable line current transformer. When sorting, the time is first aligned according to the same line number, and then records with breakpoint jitter and those that obviously exceed the transformer range are removed. Then, the effective current records before and after the start time of this cycle are grouped into low load, medium load or high load ranges. If the load record is interrupted beyond the allowable sorting boundary of this cycle, the load range is recorded as pending record and the submission of the reference frame for this cycle is restricted.

[0057] The abnormal status of the previous cycle refers to the status result that has been recorded in the previous monitoring cycle. Its source is the final status field in the monitoring record of the previous cycle. It is allowed to take one of the following: normal status, environmental intrusion status, connector deterioration status, heat dissipation limitation status, or sensor failure status. If there is no record in the previous cycle, the initial status will be recorded as blank. If the record of the previous cycle is not closed, the most recently closed status will be used and the reference relationship will be retained.

[0058] The boundary version is the boundary record number used in this cycle. It comes from the boundary version repository that has been reviewed and approved. Its content is only written as a reference number in this step and will not be used to develop subsequent traffic distribution rules in this step. The boundary version is matched according to the effective time and the protection box model. Old versions cannot overwrite new versions. Manually revised versions must be reviewed and approved before they can be referenced.

[0059] The above fields are processed in the following order: protection box number, connector number, cavity structure, load range, previous cycle abnormal status, and boundary version. First, the field identification fields are merged, then the structural fields are checked, then the load range is aligned, and finally the previous cycle abnormal status and boundary version are bound. The resulting cavity status reference frame is stored as an overwriteable record in the local recording area of ​​the monitoring host and synchronized to the station monitoring platform. The record content includes at least the protection box number, connector number, cavity structure summary, load range, previous cycle abnormal status, boundary version, formation time, and record verification value.

[0060] When delivering this step to the next stage, only the cavity status reference frame number and the above-mentioned field content are submitted. The next stage will use this to limit the collection objects and record ownership. This step does not generate evidence of temperature rise, environmental intrusion, joint deterioration, or heat dissipation limitation in advance.

[0061] To ensure continuous operation on site, the reference frame is written in the order of the monitoring cycle. Only one valid cavity status reference frame is allowed to be formed within the same protection box number, the same connector number, and the same cycle. When submitting repeatedly, the already formed record shall be used as the basis and the submission trace shall be added. When communication is interrupted, it shall be temporarily stored in the local recording area. After the communication is restored, it shall be retransmitted in the order of the formation time. The retransmission shall not change the original formation time.

[0062] This step only reads the operation record and archive record, and does not issue power outage, circuit breaker opening / closing or pressure relief control actions. The on-site verification photos and remarks entered by the personnel are only used as the basis for field verification and are not used as a separate judgment conclusion.

[0063] During on-site spot checks, at least five protection boxes from the same site can be randomly selected to verify the consistency rate of the protection box number, connector number, cavity structure, and boundary version. If the consistency rate is lower than the preset requirement, the automatic generation of the new reference frame for that site will be suspended and the process will be transferred to manual verification.

[0064] This method applies to fireproof and explosion-proof cable joint protection boxes that have been registered as assets and have periodic monitoring records. For protection boxes that are temporarily installed, unlabeled, or for which no joint files have been established, only records to be supplemented are allowed.

[0065] Preferably, the monitoring cycle can be set to 5 minutes, the time deviation of the effective recording of the load current does not exceed 30 seconds, the cavity volume registration deviation does not exceed 5%, the number of communication retransmission retries is 3 times with an interval of 10 seconds, and when the protection box number in a certain 10 kV cable well is BX-023, the connector number is JT-023, the cavity volume is 18 liters, the load range is medium load, the abnormal state of the previous cycle is normal state, and the boundary version is BV-20260601, the system forms a reference frame JZF-023-202606240915 and hands it over to the subsequent module for call.

[0066] Alternatively, the protection box number can be obtained by manually scanning the high-temperature resistant metal nameplate, and the load range can be obtained by merging the historical load curves at the station end. However, the order of the protection box number, connector number, cavity structure, load range, previous cycle abnormal state, and boundary version used to generate the cavity status reference frame must not be changed.

[0067] The differential evidence acquisition module is used to acquire internal and external temperatures, internal and external humidity, water immersion signal, partial discharge signal, gas changes, pressure perturbation, and load current under the constraint of the cavity state reference frame, generating temperature rise evidence, environmental intrusion evidence, connector degradation evidence, and heat dissipation limitation evidence. The specific implementation is as follows:

[0068] After reading the formed cavity status reference frame, the differential evidence acquisition module begins the acquisition action for this cycle. The main execution entities are the edge monitoring host near the protection box and the sensing units installed inside and outside the protection box. The acquisition objects are limited to the protection box number and connector number that have been bound in the cavity status reference frame. The acquisition interval covers this monitoring cycle, and the effective period is after the cavity status reference frame is formed and before the anomaly source diversion module is called.

[0069] The temperature inside the box is obtained by a temperature sensing unit located near the connector inside the protective box, in degrees Celsius. The measurement aperture is the air temperature near the outer surface of the connector inside the protective box cavity or the temperature of the support component near the connector. When processing, first record the protective box number in the cavity status reference frame, then align it according to the acquisition time, and remove open circuit, short circuit and temperature values ​​that exceed the sensor range. Short-term missing values ​​can be filled by adjacent valid records of the same sensing unit, but continuous missing values ​​cannot be filled.

[0070] The external temperature is obtained by a temperature sensing unit located near the outer wall of the protective box, away from direct heat radiation from the cable. The unit is in degrees Celsius. The measurement aperture is the ambient temperature inside the cable trench, cable well, or cable tunnel where the protective box is located. The sorting order is consistent with the internal temperature of the box and serves as an external reference for the temperature rise evidence.

[0071] The humidity inside the box is obtained by the humidity sensing unit inside the protective box, and the unit is relative humidity percentage. Its recording should be assigned to the same period as the temperature inside the box. If the humidity sensing unit inside the box is covered by water or fails the self-test, the humidity inside the box will not be automatically replenished for this period and a record will be retained for verification.

[0072] The external humidity is obtained by the external environmental humidity sensing unit of the protective box, and the unit is relative humidity percentage. The record is used as an external reference to form evidence of environmental intrusion. If the external humidity of the protective box is inconsistent with the external humidity of the adjacent protective box for a long period of time, it will be marked as a source to be verified and will not replace the internal humidity of the box.

[0073] Water immersion signals are obtained from water immersion contacts installed at the bottom of the protection box or in locations easily accessible by water accumulation in the cable well. The contact diameter is either in a water immersion state or not. During data processing, the data is included in the current cycle according to the time of acquisition. Records that are triggered once and then immediately restored are not directly deleted, but are merged together with the humidity records in the box in the same cycle into the environmental intrusion evidence file.

[0074] Partial discharge signals are acquired by a partial discharge acquisition unit located near the connector. The range of the partial discharge signals is the discharge pulse record related to the connector within this cycle. When processing the data, isolated pulses that are obviously caused by switch operation and communication interference are first removed, and then the original evidence of the connector deterioration evidence is written into the connector deterioration evidence film according to the protection box number and connector number.

[0075] Gas changes are obtained by the gas sensing unit inside the protection box. Its aperture represents the trend of gas concentration in the box relative to the historical baseline of this protection box during the current cycle. The gas sensing unit must not automatically supplement gas changes if it has not completed preheating, has not reached the calibration period, or is under maintenance.

[0076] Pressure perturbations are obtained by the pressure sensing unit of the protective box cavity. Its aperture is a short-term fluctuation record of the cavity pressure relative to the external ambient pressure within the current cycle. When processing, pressure records that are temporally adjacent to the internal temperature, partial discharge signal and gas changes are retained, while pressure records formed during maintenance and opening of the cover are removed.

[0077] The load current is obtained from the line current transformer, ring main unit monitoring unit or station load record, and the unit is ampere. The record must correspond to the load interval in the cavity status reference frame. If the load current is inconsistent with the line number or the acquisition time exceeds the processing boundary of this cycle, no heat dissipation limitation evidence will be generated in this cycle.

[0078] The above records are collected in the following order: internal temperature, external temperature, internal humidity, external humidity, water immersion signal, partial discharge signal, gas change, pressure disturbance, and load current. Time alignment is completed first, invalid records are removed, and short-term supplementation within the allowable range is completed. Missing information such as protection box number, connector number, gas change, and load current source cannot be automatically inferred.

[0079] The temperature rise evidence sheet is formed by combining the internal temperature, external temperature and load current within the same cycle, recording the temperature difference between the inside and outside of the box, the direction of temperature change and the load attribution relationship.

[0080] The environmental intrusion evidence film is formed by combining the humidity inside the box, the humidity outside the box, and the water immersion signal, and records the humidity difference, the direction of humidity change, and the traces of water immersion triggering.

[0081] The connector degradation evidence film is formed by combining partial discharge signals, gas changes, pressure perturbations, and internal temperature, and records the time correspondence between partial discharge activity, gas changes, pressure perturbations, and temperature changes.

[0082] The heat dissipation limitation evidence sheet is formed by merging the internal temperature, external temperature, load current, and cavity structure in the cavity state reference frame, and records the temperature difference between the inside and outside of the cavity corresponding to the load current and the cavity structure reference relationship.

[0083] Each piece of evidence is stored in the local recording area of ​​the edge monitoring host in an indelible record, and is synchronized to the station-end monitoring platform along with the protection box number, connector number, cavity status reference frame number, formation time, and boundary version. The next step only reads the evidence piece number and the recorded content, without changing the record already formed in this step.

[0084] Collected records with the same protection box number, the same connector number, and those arriving repeatedly within the same period are deduplicated according to the collection time and sensor unit number. Later records can only be used as supplementary traces and do not overwrite submitted evidence. This step does not issue power outage, circuit breaker opening / closing, pressure relief, or fire extinguishing actions.

[0085] Preferably, the monitoring cycle can be set to 5 minutes, the temperature acquisition interval is 10 seconds, the humidity acquisition interval is 30 seconds, the water immersion signal acquisition interval is 10 seconds, the partial discharge signal acquisition window is 30 seconds, the gas change and pressure disturbance acquisition interval is 10 seconds, the load current takes no less than 3 valid records within the current cycle, the allowable error of the temperature sensing unit is ±1 degree Celsius, the allowable error of the humidity sensing unit is ±5 percentage points, the allowable error of the pressure sensing unit is ±0.5 kPa, and the number of communication retransmission retries is 3 with an interval of 10 seconds.

[0086] For example, if the protection box number BX-023 and the connector number JT-023 generate the following data within a 5-minute cycle: internal temperature 68 degrees Celsius, external temperature 31 degrees Celsius, internal humidity 82%, external humidity 64%, water immersion signal no water immersion, partial discharge signal continuous pulse, gas change rising, pressure disturbance present, and load current 360 amps, the system will generate evidence of temperature rise, environmental intrusion, connector degradation, and heat dissipation limitation, and then send these evidences to the anomaly source diversion module for use.

[0087] Alternatively, the temperature inside the box can be obtained from the optical fiber temperature measurement point attached near the outer sheath of the connector, the temperature outside the box can be obtained from the same temperature measurement point in the cable well, and the partial discharge signal can be obtained from the transient ground voltage acquisition unit. However, the order in which the above signals are acquired sequentially and the four types of evidence are formed under the limitation of the cavity state reference frame must not be changed.

[0088] The anomaly source triage module is used to identify one of the following states based on the temporal matching relationship of evidence fragments: environmental intrusion state, connector deterioration state, heat dissipation limitation state, and sensor failure state. Specifically, it is implemented as follows:

[0089] After the abnormal source diversion module has completed the recording of the temperature rise evidence piece, environmental intrusion evidence piece, joint deterioration evidence piece, and heat dissipation limitation evidence piece, it reads the timing matching relationship of the evidence pieces. The executing entity is the edge monitoring host in the monitoring cabinet of the cable trench, cable well, or cable tunnel. The time period of action is after the differential evidence acquisition module forms the evidence pieces and before the verification sampling strategy generation module reads the lock status.

[0090] The timing matching relationship of the evidence pieces is the correspondence of the formation time, duration interval and adjacent change direction of each evidence piece within the monitoring cycle under the same protection box number, the same connector number and the same cavity status reference frame number. Its source is limited to the temperature rise evidence piece, environmental intrusion evidence piece, connector deterioration evidence piece and heat dissipation limitation evidence piece that have already been recorded. The original sensor records are not reread, and missing evidence pieces are not automatically supplemented.

[0091] During the sorting process, first check the protection box number and connector number of each piece of evidence, then check the cavity status reference frame number and boundary version, then merge records of the same period according to the formation time, and finally filter out late and duplicate records caused by maintenance opening, sensor unit maintenance marking and communication recovery retransmission. Late records can only be attached to the original evidence pieces as a trace and do not change the completed timing matching relationship.

[0092] The environmental intrusion status is determined based on the fact that the environmental intrusion evidence changes before the joint deterioration evidence, there are continuous traces of humidity or water immersion signals inside the box, and the temperature rise evidence does not show synchronous enhancement adjacent to the partial discharge signal. In actual cable well scenarios, if the humidity outside the box increases after a rainstorm and is accompanied by water immersion signals at the bottom of the box, and the joint deterioration evidence does not form a continuous correspondence, then the protection box is locked as an environmental intrusion status for this cycle.

[0093] The joint degradation status is determined based on the temporal proximity of partial discharge signals, gas changes, pressure disturbances, and box temperature in the joint degradation evidence film, and this proximity relationship is not prioritized by environmental intrusion evidence films. In the field, this status is used to classify the joint insulation degradation or local thermal fault of the joint, and is not directly locked by a single partial discharge pulse or a single pressure jump.

[0094] The heat dissipation limitation status is determined based on the continuous correspondence between the heat dissipation limitation evidence sheet and the temperature rise evidence sheet within the same load range, the absence of water immersion or continuous humidity traces on the environmental intrusion evidence sheet, the absence of partial discharge signals on the connector deterioration evidence sheet, and the adjacent relationship between gas changes and pressure perturbations. This is applicable to operating scenarios where the heat dissipation conditions are limited due to the cavity structure of the fireproof and explosion-proof protection box.

[0095] Sensor failure status is locked when any piece of evidence shows that the sensor unit has failed its self-test, the same measuring point remains constant for a long time, the direction of change of the same type of internal and external measuring points violates the physical relationship on site, or key evidence is missing and its source cannot be confirmed by the recorded data. Once locked, it only indicates that the status of this period belongs to the sensor failure status and does not replace the maintenance personnel's inspection conclusion of the specific sensor unit.

[0096] The above states are matched in the order of environmental intrusion state, connector deterioration state, heat dissipation limitation state, and sensor failure state. When the preceding state has already met the corresponding conditions in the boundary version, the subsequent state will no longer be locked. If multiple states are met simultaneously in the same period, the time sequence matching relationship of the evidence piece with the earlier formation time and more complete duration interval will be used. If they cannot be distinguished, the state will be locked as sensor failure state and a record to be verified will be formed.

[0097] Upon completion, a status lock record is generated. The record includes at least the protection box number, connector number, cavity status reference frame number, evidence piece number involved in the matching, evidence piece timing matching relationship summary, lock status, boundary version, and generation time. The status lock record is written to the local recording area of ​​the edge monitoring host in an overwriteable manner and synchronized to the station monitoring platform. The next step only reads the lock status and status lock record number.

[0098] This module does not issue power outage, circuit breaker opening / closing, pressure relief, fire extinguishing, or dispatch actions. Old boundary versions must not overwrite boundary versions already referenced in this cycle. Only one valid status lock record is allowed for the same protection box number, the same connector number, and the same cavity status reference frame number. When submitting repeatedly, the submission trace is retained and the already formed record is returned.

[0099] Preferably, the monitoring cycle can be set to 5 minutes, the allowable deviation of the evidence piece formation time can be set to 30 seconds, the number of consecutive corresponding times can be set to 2, the state lock record writing delay can be controlled within 5 seconds, and the number of communication retransmission retries is 3 with an interval of 10 seconds. For example, when the 10 kV cable well protection box BX-023 forms environmental intrusion evidence pieces without water immersion, joint deterioration evidence pieces with continuous enhancement of partial discharge signal, rising gas change, presence of pressure perturbation, and temperature rise evidence pieces showing that the temperature inside the box rises from 62 degrees Celsius to 68 degrees Celsius in the same cycle, the system locks the cycle as the joint deterioration state.

[0100] Alternatively, the temporal matching relationship of the evidence pieces can be merged by the station-end monitoring platform and then sent back to the edge monitoring host for confirmation, but the status attribution caliber of one of the environmental intrusion status, connector deterioration status, heat dissipation limitation status, and sensor failure status locked based on the temporal matching relationship of the evidence pieces must not be changed.

[0101] The review sampling strategy generation module is used to generate sampling objects, sampling frequency, and observation windows based on the locked state. Specifically, it is implemented as follows:

[0102] After the edge monitoring host obtains the locked state formed in the previous step, it generates the current cycle review sampling strategy according to the locked state. The on-site location is the protection box monitoring cabinet in the cable trench, cable well or cable tunnel. The strategy applies to records that have completed the state lock under the same protection box number, the same connector number and the same cavity state reference frame number. The application period is after the state lock record is formed and before the subsequent graded disposal record is formed.

[0103] The locked state is one of the following states that has been written into the abnormal source diversion module: environmental intrusion state, connector deterioration state, heat dissipation limitation state, or sensor failure state. The source of the locked state is the state lock record. The original sensor signal is not reread and the already locked state is not changed.

[0104] The sampling object is the field signal source that needs to be reviewed and read in this cycle. It is selected from the existing sensing units according to the locked state. The environmental intrusion state corresponds to the humidity inside the box, the humidity outside the box, and the water immersion signal. When the field manifestation is water accumulation in the well, condensation, or moisture in the sealed area, priority is given to observing whether the humidity inside the box continues to remain high and whether the water immersion signal continues to exist.

[0105] The deterioration state of the connector corresponds to partial discharge signals, gas changes, pressure perturbations, and internal temperature. On-site, when there is discharge activity near the connector, gas rise, or short-term fluctuations in cavity pressure, the adjacent acquisition relationship of these signals is preferentially retained.

[0106] The heat dissipation-limited state corresponds to the internal temperature, external temperature, and load current. The cavity structure in the cavity state reference frame is used as a reference. On-site, when the internal temperature of the cavity is consistently higher than the external temperature after the load is maintained, the focus is on observing the correspondence between temperature and load current.

[0107] When a sensor fails, the sensor unit and its similar reference measurement points are marked with a status lock record. In the field, when the measurement points do not change for a long time, the direction of change of internal and external measurement points does not conform to the physical relationship of the field, or the self-test mark fails, only the sensor unit and its similar reference measurement points are included in the review scope, and it is not expanded to irrelevant measurement points.

[0108] The sampling frequency is the sampling interval or number of samplings of the sampling object within the observation window. It is derived from the verification sampling parameters in the current boundary version. When generating it, the locked state is read first, then the sampling object range corresponding to the state is read, and then the sampling frequency of each sampling object is written. If the sampling frequency of a certain sampling object is missing in the boundary version, the verification sampling strategy will not take effect and a record to be supplemented will be formed. It is not automatically inferred by the system.

[0109] The observation window is the time period during which the verification sampling strategy allows continuous sampling. It starts from the time the verification sampling strategy takes effect and ends at the deadline specified by the boundary version. On-site, it is used to limit the duration of verification sampling to prevent long-term high-frequency sampling from occupying the communication and power supply resources of the monitoring cabinet.

[0110] The generation process is executed in the order of lock status, sampling object, sampling frequency, and observation window. First, the protection box number, connector number, cavity status reference frame number, and boundary version in the status lock record are checked. Then, the sampling object is obtained according to the lock status. Next, the sampling frequency is written. Finally, the start and end times of the observation window are determined.

[0111] Once the strategy is formed, it is stored in the local recording area of ​​the edge monitoring host as an indelible record and synchronized to the station monitoring platform. The record includes at least the protection box number, connector number, status lock record number, lock status, sampling object, sampling frequency, observation window, boundary version, and formation time. Subsequent steps will follow the record to check the sampling and backfill the sampling completion traces.

[0112] Only one valid verification sampling strategy is allowed to be generated for the same protection box number, the same connector number, and the same status lock record number. When generating repeatedly, the submission trace is retained and the already formed record is referenced. When communication is interrupted, it is temporarily stored in the local record area. After the communication is restored, it is retransmitted according to the formation time. The retransmission must not change the sampling frequency and the observation window.

[0113] This step only generates a sampling schedule and does not issue any actions such as power outage, circuit breaker opening / closing, pressure relief, fire extinguishing, or dispatching. If the sensor unit corresponding to the sampling object is in a maintenance exit state, the review sampling strategy will be transferred to pending verification and the reason for non-effectiveness will be retained.

[0114] On-site spot checks can verify whether the locking status and sampling objects in the strategy are consistent, whether the observation window falls into the later period of the monitoring cycle, and whether the sampling frequency comes from the current boundary version. The spot check objects are the strategy records of different protection boxes at the same site.

[0115] Preferably, the sampling frequency of humidity inside and outside the box under environmental immersion conditions can be set to once every 30 seconds, the water immersion signal can be set to once every 10 seconds, and the observation window can be set to 10 minutes.

[0116] The sampling window for partial discharge signals under the condition of connector degradation can be set to 60 seconds continuously, the sampling window for gas changes, pressure perturbations and internal temperature can be set to once every 10 seconds, and the observation window can be set to 15 minutes.

[0117] Under limited heat dissipation conditions, the internal temperature, external temperature, and load current can be set to be measured every 30 seconds, and the observation window can be set to 30 minutes.

[0118] For example, when the lockout state of the protection box BX-023 and the connector JT-023 is the connector deterioration state, the system generates a verification sampling strategy that includes partial discharge signal, gas change, pressure perturbation and box temperature. The sampling frequency is written according to the above parameters and takes effect within a 15-minute observation window.

[0119] Alternatively, the sampling frequency can be confirmed by the edge monitoring host after being issued by the station-side monitoring platform based on the current boundary version, but the order of generating sampling objects, sampling frequency and observation windows based on the locked status must not be changed.

[0120] The tiered handling record generation module is used to generate tiered handling records based on the review and sampling results. These records include the source of the anomaly, evidence piece number, review strategy number, anomaly level, handling action, and a flag to prevent repeated alarms. Specifically, the implementation is as follows:

[0121] After the observation window specified by the verification sampling strategy ends, the edge monitoring host will merge the verification sampling results of this cycle into a graded handling record. The on-site location is the protection box monitoring cabinet in the cable trench, cable well or cable tunnel. The record source is limited to the verification sampling results that have been completed under the same protection box number, the same connector number, and the same status lock record number. The time period is after the verification sampling strategy generation module forms the sampling arrangement and before the boundary write-back module receives the operation and maintenance feedback.

[0122] The verification sampling results are verification records formed by the sampling object under the sampling frequency and observation window. The source of these records is the field sensing unit and the local recording area of ​​the edge monitoring host corresponding to the verification sampling strategy. When organizing the records, first check the protection box number and connector number, then check the verification strategy number. Subsequently, the sampling completion traces are merged according to the formation time in the observation window. Delayed records caused by maintenance opening, sensor unit exit, and communication retransmission are only retained as auxiliary traces and do not change the already merged verification sampling results.

[0123] The source of the anomaly is inherited from the previous locked state. The record is one of the following: environmental intrusion state, connector deterioration state, heat dissipation limitation state, or sensor failure state. The state is not rewritten based on a single verification value. For example, after the protection box completes the verification of partial discharge signal, gas change, pressure perturbation, and internal temperature of the box under the connector deterioration state, this field is still recorded as connector deterioration state.

[0124] The evidence piece number is the record number of the temperature rise evidence piece, environmental intrusion evidence piece, connector deterioration evidence piece, or heat dissipation limitation evidence piece that triggered this lockout state. The source is the evidence piece number already referenced in the state lockout record. If the evidence piece number is missing or inconsistent with the protection box number, a valid graded disposal record will not be formed and the case will be transferred to pending verification.

[0125] The review strategy number is the strategy record number generated by the review sampling strategy generation module. It comes from the review sampling strategy record and is used to describe the sampling object, sampling frequency and observation window corresponding to this graded treatment record. If the review strategy number is duplicated, the strategy record that took effect earliest and completed the observation window shall prevail.

[0126] The anomaly level is determined based on the persistence of the verification sampling results within the observation window, the number of verification sampling objects, and the completeness of the verification record. It is recorded as one of the following: attention, verification alarm, maintenance handling, or emergency handling. Under environmental intrusion conditions, the main basis is the persistent trace of water immersion signal and the humidity maintenance inside the box. Under connector deterioration conditions, the main basis is the adjacent persistence of partial discharge signal, gas change, pressure perturbation, and temperature inside the box. Under heat dissipation limitation conditions, the main basis is the corresponding situation of temperature inside the box, temperature outside the box, and load current within the observation window. Under sensor failure conditions, the main basis is the self-test failure, long-term constant, and inconsistency of similar reference measurement points.

[0127] The response action is determined based on the level of abnormality and is recorded as one of the following: continuous observation, on-site verification, maintenance and troubleshooting, or emergency alert. This step only generates a response action record and does not directly issue power outage, circuit breaker opening and closing, pressure relief, or fire extinguishing control.

[0128] The "Do Not Repeat Alarm" flag is determined based on whether an unclosed graded handling record has been formed in adjacent cycles for the same protection box number, the same connector number, the same anomaly source, and the same anomaly level. If an unclosed record exists, a "Do Not Repeat Alarm" flag is written; if no unclosed record exists, an "Allow Alarm" flag is written. When submitting repeatedly, the submission trace is retained and the already formed graded handling record is referenced.

[0129] The graded handling record is written to the local recording area of ​​the edge monitoring host in an overwriteable manner and synchronized to the station-end monitoring platform. It includes at least the protection box number, connector number, review sampling result summary, anomaly source, evidence piece number, review strategy number, anomaly level, handling action, prohibition of repeating alarm flag, formation time and boundary version. The next step only reads this record and its handling action and alarm flag, without modifying the fields already formed in this step.

[0130] When communication is interrupted, records are temporarily stored in the local record area. After communication is restored, records are retransmitted according to their creation time. Old records must not overwrite new records. Only one valid graded handling record is allowed for the same protection box number, the same connector number, and the same review strategy number.

[0131] Preferably, the observation window can be set to 10 to 30 minutes, the delay in writing the graded handling record can be controlled within 5 seconds, and the number of communication retransmission retries can be set to 3 times with an interval of 10 seconds. For example, when the protection box BX-023 and connector JT-023 form a review sampling result in the review strategy FH-023, indicating that the partial discharge signal is continuously present, the gas change is rising, the pressure disturbance is present, and the temperature inside the box rises from 68 degrees Celsius to 72 degrees Celsius, the system generates a graded handling record with the abnormality source being connector deterioration state, the evidence piece number being ZJP-023, the review strategy number being FH-023, the abnormality level being maintenance handling, the handling action being maintenance and investigation, and the prohibition of repeated alarms being marked as alarm allowed.

[0132] Alternatively, the tiered handling record can be generated by the station-side monitoring platform after receiving the review sampling results and sent back to the edge monitoring host for record keeping, but the record definition generated based on the review sampling results, which includes the source of the anomaly, evidence piece number, review strategy number, anomaly level, handling action, and a prohibition on repeating alarms, must not be changed.

[0133] The boundary write-back module is used to write operational feedback into the next cycle boundary version and correct abnormal traffic splitting conditions, review sampling priorities, and continuous abnormal counts. Specifically, it is implemented as follows:

[0134] After the hierarchical handling record is formed, the edge monitoring host receives the corresponding operation and maintenance feedback and writes the operation and maintenance feedback into the next cycle boundary version. The on-site location is the station-end monitoring platform and protection box monitoring cabinet corresponding to the cable trench, cable well or cable tunnel. The operation and maintenance feedback comes from the on-site inspection terminal, maintenance work order record or station-end confirmation record. Its belonging object is limited to the same protection box number, the same connector number and the same hierarchical handling record.

[0135] Operation and maintenance feedback refers to the confirmation content of on-site personnel after the execution of the handling action. The record scope includes confirmation of water ingress, confirmation of joint overheating, confirmation of sensor failure, confirmation of false alarm, drainage and dehumidification, completion of joint maintenance or incomplete handling. When forming the feedback, first check the protection box number and joint number, then check the abnormality source, evidence piece number, review strategy number and abnormality level in the graded handling record. Then, associate the on-site feedback time, feedback personnel identification mark and feedback photo or maintenance remarks with the graded handling record. Operation and maintenance feedback that does not match the graded handling record shall not be written into the next cycle boundary version, but only form a pending verification record.

[0136] The next cycle boundary version is the boundary record referenced by the cavity reference frame locking module in the next monitoring cycle. It is generated by copying the current boundary version and adding the operation and maintenance feedback reference relationship. The old version is retained and cannot be overwritten. The boundary version already referenced in the current cycle will not be changed due to operation and maintenance feedback, so as to prevent the status judgment criteria during operation from being rewritten midway.

[0137] The abnormal diversion condition is the state matching caliber read by the abnormal source diversion module in the next cycle. Its correction is based on the corresponding result of the time sequence matching relationship between the operation and maintenance feedback and the evidence pieces in this cycle. For example, when the operation and maintenance feedback confirms water ingress, the water immersion signal corresponding to the environmental intrusion state and the continuous humidity trace inside the box are used as the priority comparison conditions for the next cycle. When the operation and maintenance feedback confirms connector overheating, the adjacency relationship of the partial discharge signal, gas change, pressure perturbation and temperature inside the box corresponding to the connector deterioration state is retained as the key comparison conditions for the next cycle. When the operation and maintenance feedback confirms sensor failure, the failure measurement point in the corresponding evidence piece is excluded from the effective matching source in the next cycle.

[0138] The priority of the verification sampling is a record field that determines the order of sampling objects in the next cycle of the verification sampling strategy generation module. It corrects the confirmation results of the locked state based on the operation and maintenance feedback. When water ingress is confirmed, the priority of verification sampling of humidity inside the box, humidity outside the box, and water immersion signal is increased. When the connector is confirmed to be overheating, the priority of verification sampling of partial discharge signal, gas change, pressure perturbation, and temperature inside the box is increased. When the sensor is confirmed to be faulty, the sensor unit that is confirmed to be faulty is downgraded to the source to be checked and similar reference measurement points are retained.

[0139] The continuous anomaly count is the number of times that the same protection box number, the same connector number, and the same anomaly source are continuously locked and form a graded handling record in adjacent cycles. When writing, it is based on the closed graded handling record and operation and maintenance feedback. If it is confirmed that the same problem still exists, the count will continue in the next cycle boundary version. If it is confirmed that drainage and dehumidification have been completed, connector maintenance has been completed, or false alarms have been confirmed, the corresponding count will be cleared. If the handling is not completed, the count will be retained and the reason for not completing it will be marked.

[0140] Boundary write-back is performed in the following order: operation and maintenance feedback, next cycle boundary version, abnormal traffic diversion conditions, review sampling priority, and continuous abnormal count. The resulting next cycle boundary version must include at least the protection box number, connector number, referenced hierarchical handling record, operation and maintenance feedback summary, corrected abnormal traffic diversion conditions, corrected review sampling priority, continuous abnormal count, formation time, and version effective time. It is stored in the boundary version repository of the station-side monitoring platform in an overwriteable manner, and a version reference number is issued to the edge monitoring host.

[0141] The same level of handling record is only allowed to be written to the valid operation and maintenance feedback once. When submitting repeatedly, the submission trace is retained and the next cycle boundary version that has been formed is referenced. When communication is interrupted, the station monitoring platform retains the pending distribution status. After recovery, it is distributed according to the formation time. The reissue must not change the version effective time.

[0142] This step only corrects the next cycle boundary version and does not directly issue power outage, circuit breaker opening / closing, pressure relief, or fire extinguishing control actions. The recording of personnel identification marks and on-site photos is only used for feedback and attribution confirmation and is not for public display.

[0143] During on-site spot checks, the consistency between operation and maintenance feedback and hierarchical handling records can be verified, whether the next cycle boundary version is correctly referenced, whether the abnormal traffic diversion conditions and review sampling priorities are corrected according to the feedback type, and whether the continuous abnormal count is continued or cleared.

[0144] Preferably, the next cycle boundary version can be generated within 30 seconds after the operation and maintenance feedback confirmation. The number of version issuance retry can be set to 3 times with an interval of 10 seconds. The continuous anomaly count can be set to 0 to 99. The graded handling record of a certain protection box BX-023 and connector JT-023 is that the connector is in a deteriorated state and the anomaly level is maintenance handling. After the on-site feedback confirms that the connector is overheating and the maintenance is completed, the system generates the next cycle boundary version BV-2026062402, keeps the review sampling priority corresponding to the connector deterioration state as high priority, and clears the corresponding continuous anomaly count to 0.

[0145] Alternatively, maintenance feedback can be recorded offline by the mobile inspection terminal and then transmitted back to the station monitoring platform, but the order of writing maintenance feedback into the next cycle boundary version must not be changed, and the order of abnormal diversion conditions, review sampling priority, and continuous abnormal count must be corrected.

[0146] In the operational scenario shown in this embodiment: a fireproof and explosion-proof cable joint protection box is installed in a 10 kV cable well of a substation. The protection box is numbered BX-023, the joint is numbered JT-023, the cavity volume of the protection box is 18 liters, and the sealing method is bolt tightening. The edge monitoring host is installed in the monitoring cabinet of the cable well and is connected to the temperature sensing unit inside the box, the temperature sensing unit outside the box, the humidity sensing unit inside the box, the humidity sensing unit outside the box, the water immersion contact, the partial discharge acquisition unit, the gas sensing unit, the pressure sensing unit, and the line load current recording source.

[0147] The system operates in a 5-minute monitoring cycle. After entering a new monitoring cycle at 9:15, the cavity reference frame locking module first reads the protection box nameplate, asset ledger, cable joint file, cavity structure registration form, line load monitoring record, and the monitoring record of the previous cycle. It confirms that the protection box number BX-023 and the joint number JT-023 have a one-to-one binding relationship, the cavity structure registration is complete, the current load current is in the medium load range, the abnormal state of the previous cycle is normal, and the current reference boundary version is BV-20260601. Thus, the cavity status reference frame JZF-023-202606240915 is formed, and this cavity status reference frame is used as the basis for the subsequent records of this cycle.

[0148] Subsequently, the differential evidence acquisition module collected on-site data for this period under the constraints of the cavity state reference frame. The internal temperature rose from 62 degrees Celsius to 68 degrees Celsius, while the external temperature remained around 31 degrees Celsius. The internal humidity was 82%, and the external humidity was 64%. There was no water immersion signal. The partial discharge signal showed continuous pulses within the 30-second acquisition window. The gas change showed an upward trend, and pressure perturbation was present. The load current was 360 amps. The edge monitoring host aligned the acquisition completion time according to the acquisition time, removed late records that did not belong to this period, and grouped the internal temperature, external temperature, and load current into a temperature rise evidence piece. The internal humidity, external humidity, and water immersion signal were grouped into an environmental intrusion evidence piece. The partial discharge signal, gas change, pressure perturbation, and internal temperature were grouped into a connector degradation evidence piece. The internal temperature, external temperature, load current, and cavity structure were grouped into a heat dissipation limitation evidence piece. Each evidence piece carried the protection box number, connector number, cavity state reference frame number, formation time, and boundary version.

[0149] Next, the anomaly source diversion module reads the timing matching relationship of the four types of evidence pieces and confirms that there is no water immersion signal in the environmental intrusion evidence piece. Although the humidity inside the box is high, it does not show a continuous change before the joint degradation evidence piece. At the same time, the partial discharge signal continuously increases, the gas change rises, and the pressure perturbation exists in the joint degradation evidence piece. These occur adjacent to the temperature rise inside the box in the same monitoring cycle. Although the heat dissipation limitation evidence piece shows a large temperature difference between the inside and outside of the box, this change cannot explain the adjacent relationship of the partial discharge signal, gas change, and pressure perturbation on its own. Therefore, the system locks this cycle as the joint degradation state and forms a state lock record.

[0150] The verification sampling strategy generation module generates a verification sampling strategy based on the deterioration state of the connector. The sampling objects are determined as partial discharge signal, gas change, pressure perturbation and box temperature. The sampling window for partial discharge signal is set to 60 seconds continuously. The sampling frequency for gas change, pressure perturbation and box temperature is set to once every 10 seconds. The observation window is set to 15 minutes, and the verification strategy FH-023 is formed.

[0151] After the observation window ends, the graded handling record generation module merges and verifies the sampling results, confirming that the partial discharge signal still exists continuously, the gas change continues to rise, the pressure perturbation still exists, and the temperature inside the box rises from 68 degrees Celsius to 72 degrees Celsius. Therefore, a graded handling record is generated. The source of the anomaly in the record is the deterioration state of the connector, the evidence piece number is ZJP-023, the verification strategy number is FH-023, the anomaly level is maintenance handling, the handling action is maintenance and troubleshooting, and the "prohibit repeated alarm" mark is set to "alarm allowed". This record is only used as the basis for maintenance handling and does not directly trigger power outage, circuit breaker opening and closing, pressure relief or fire extinguishing actions.

[0152] After receiving the inspection and troubleshooting prompt, the maintenance personnel went to the site to verify and found localized signs of overheating on the outer sheath near the joint. They then completed the joint repair and submitted maintenance feedback through the on-site inspection terminal. The feedback confirmed that the joint was overheating and that the joint repair had been completed.

[0153] After verifying that the protection box number, connector number, anomaly source, evidence piece number, review strategy number, and anomaly level in the maintenance feedback and graded handling record are consistent, the boundary write-back module writes the maintenance feedback into the next cycle boundary version BV-2026062402. In this next cycle boundary version, the adjacent relationships of partial discharge signal, gas change, pressure perturbation, and box temperature corresponding to the connector deterioration state are retained as key comparison criteria. At the same time, the review sampling priority corresponding to the connector deterioration state is kept as high priority, and the continuous anomaly count corresponding to the completed maintenance is cleared to 0.

[0154] At the start of the next monitoring cycle, the cavity reference frame locking module reads BV-2026062402 as the new boundary version, so that subsequent acquisition, diversion, verification and disposal can continue to run based on the written-back field feedback, thus forming a continuous closed loop from cavity status reference frame, evidence piece, locking status, verification sampling strategy, graded disposal record to the boundary version of the next cycle.

[0155] All calculations involved in the embodiments are dimensionless numerical calculations, and the preset parameters and thresholds in the calculations are set by those skilled in the art according to the actual situation.

[0156] 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.

[0157] The above embodiments can be implemented, in whole or in part, by software, hardware, firmware, or any other combination thereof. When implemented using software, the above embodiments can be implemented, in whole or in part, as 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, all or part of the processes or functions described in the embodiments of this application are generated. 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 from one website, computer, server, or data center to another website, computer, server, or data center via wireless or wired transmission; wired transmission methods include optical fiber, twisted pair, coaxial cable, etc.; wireless transmission includes infrared, microwave, etc. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center containing one or more sets of available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. A semiconductor medium can be a solid-state drive.

[0158] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and modules described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0159] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or modules may be electrical, mechanical, or other forms.

[0160] The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical modules; they may be located in one place or distributed across multiple network modules. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0161] In addition, the functional modules in the various embodiments of this application can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module.

[0162] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0163] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0164] In conclusion, the above description is only a preferred 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 smart monitoring system for fireproof and explosion-proof cable joint protection boxes, characterized in that, include: The cavity reference frame locking module is used to read the protection box number, connector number, cavity structure, load range, previous cycle abnormal state and boundary version, and generate a cavity status reference frame. The differential evidence acquisition module is used to acquire the internal temperature, external temperature, internal humidity, external humidity, water immersion signal, partial discharge signal, gas change, pressure perturbation and load current under the limitation of the cavity state reference frame, and generate temperature rise evidence, environmental intrusion evidence, connector deterioration evidence and heat dissipation limitation evidence. The anomaly source triage module is used to identify one of the following states based on the temporal matching relationship of evidence fragments: environmental intrusion state, connector deterioration state, heat dissipation limitation state, and sensor failure state. The review sampling strategy generation module is used to generate sampling objects, sampling frequency, and observation windows based on the locked state; The graded handling record generation module is used to generate graded handling records based on the review and sampling results, including the source of the anomaly, evidence piece number, review strategy number, anomaly level, handling action, and a flag to prevent repeated alarms. The boundary write-back module is used to write the operation and maintenance feedback into the next cycle boundary version, and to correct the abnormal traffic diversion conditions, review the sampling priority, and the continuous abnormal count.

2. The intelligent monitoring system for fireproof and explosion-proof cable joint protection boxes according to claim 1, characterized in that, After the monitoring cycle begins, the cavity reference frame locking module is used by the edge monitoring host to read the protection box nameplate, asset ledger, cable joint file, cavity structure registration form, line load monitoring record, previous cycle monitoring record and boundary version library. The merging is completed in the order of protection box number, connector number, cavity structure, load range, abnormal state of the previous cycle, and boundary version, and the cavity status reference frame is written to the local record area.

3. The intelligent monitoring system for fireproof and explosion-proof cable joint protection boxes according to claim 1, characterized in that, After reading the cavity status reference frame, the differential evidence acquisition module limits the acquisition objects to the bound protection box number and connector number; The data is collected in the following order: internal temperature, external temperature, internal humidity, external humidity, water immersion signal, partial discharge signal, gas change, pressure perturbation, and load current. Time alignment, invalid record removal, and short-term completion are then performed sequentially.

4. The intelligent monitoring system for fireproof and explosion-proof cable joint protection boxes according to claim 3, characterized in that, The differential evidence acquisition module combines the internal temperature, external temperature, and load current to form a temperature rise evidence sheet; The humidity inside the box, the humidity outside the box, and the water immersion signal are combined to form a piece of evidence of environmental intrusion. Partial discharge signal, gas changes, pressure perturbation and internal temperature are combined to form evidence of connector degradation. The internal temperature, external temperature, load current, and cavity structure are combined to form evidence of limited heat dissipation.

5. The intelligent monitoring system for fireproof and explosion-proof cable joint protection boxes according to claim 1, characterized in that, After each piece of evidence is recorded, the abnormal source triage module verifies the protection box number, connector number, cavity status reference frame number, and boundary version. Records from the same period are merged according to their formation time to form a temporal matching relationship of evidence pieces that includes formation time, duration interval and adjacent change direction.

6. The intelligent monitoring system for fireproof and explosion-proof cable joint protection boxes according to claim 5, characterized in that, The anomaly source triage module locks down a state based on the temporal matching relationship of evidence pieces, in the order of environmental intrusion state, connector deterioration state, heat dissipation limitation state, and sensor failure state. It also generates a status lock record that includes the evidence piece number, lock status, boundary version, and formation time.

7. The intelligent monitoring system for fireproof and explosion-proof cable joint protection boxes according to claim 1, characterized in that, The verification sampling strategy generation module reads the lock status from the lock status record; The sampling object is determined by the locked status; Obtain the sampling frequency and observation window from the boundary version; Environmental intrusion status corresponds to humidity inside the box, humidity outside the box, and water immersion signals; The degradation state of the connector corresponds to partial discharge signal, gas changes, pressure perturbations, and internal temperature of the enclosure. The corresponding temperature inside the box and outside the box, as well as the load current, are under the condition of limited heat dissipation. The sensor failure state corresponds to the marked sensing unit and the same type of reference measurement point.

8. The intelligent monitoring system for fireproof and explosion-proof cable joint protection boxes according to claim 1, characterized in that, After the observation window ends, the graded treatment record generation module reads the review sampling results. The review sampling results are the review records generated by the sampled object under the limitations of sampling frequency and observation window. Verify the protection box number, connector number, and verification strategy number; Inherit the locked state as the source of the anomaly and generate a hierarchical handling record containing evidence fragment number, review strategy number, anomaly level, handling action, and a flag to prevent repeated alarms.

9. The intelligent monitoring system for fireproof and explosion-proof cable joint protection boxes according to claim 1, characterized in that, After the hierarchical handling record is formed, the boundary write-back module receives operation and maintenance feedback after the handling action is executed; Verify the protection box number, connector number, and classification and handling record; Write the maintenance feedback into the next cycle boundary version; It also corrected the abnormal diversion conditions, reviewed the sampling priority, and the continuous abnormal count.

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