220kv booster station pressing plate state intelligent monitoring and early warning method and system

Abstract

The present application relates to the technical field of smart grid, in particular to a 220kV booster station pressure plate state intelligent monitoring and early warning method and system, comprising the following steps: obtaining auxiliary contact jump, terminal row, input quantity, protection input and background receiving time in commissioning verification, calculating section transfer time limit and determining commissioning and decommissioning identification reference, collecting pressure plate number and real-time voltage in operation, determining action direction and starting point according to crossing direction, comparing direction and time of multiple states, and outputting abnormal section and state early warning. In the present application, the time limit reference and voltage reference formed in the verification stage constrain operation monitoring, the pressure plate action is changed from single-point state display to link verification, the action direction, state consistency and transfer timeout can be judged, the inconsistent state, loop delay and background receiving lag position can be identified, the manual check of screen cabinet signal and background record is reduced, and the commissioning and decommissioning identification accuracy, fault positioning efficiency and protection operation reliability are improved.

Description

Technical Field

[0001] This invention relates to the field of smart grid technology, and in particular to a method and system for intelligent monitoring and early warning of the status of pressure plates in a 220kV substation. Background Technology

[0002] The field of smart grid technology involves electrical condition detection, signal acquisition, operation monitoring, and dispatch support for primary and secondary equipment in power systems. Among these, the traditional intelligent monitoring and early warning method for the status of pressure plates in 220kV substations refers to an electrical detection method that collects the pressure plate's on / off status through auxiliary contacts, input acquisition units, terminal block circuits, relay protection devices, and the station control layer monitoring host within the substation's protection cabinets, control cabinets, or automation cabinets. This status data is then transmitted to the back-end system via bay-level devices for display, recording, and alarm determination.

[0003] The existing pressure plate status monitoring relies on a hierarchical transmission link formed by auxiliary contacts, terminal blocks, input acquisition, protection devices, and background display. The focus of operation is mostly on the final activation / deactivation status and alarm records. There is no unified benchmark for the transition time, arrival time, and confirmation time during the transmission process. When contact jitter, loop delay, inconsistent status, or background reception lag occurs on site, it is difficult to locate the abnormal segment. Maintenance personnel need to manually check the panel signals and background records, which takes a long time to investigate and has a high risk of misjudgment and omission, affecting the reliability of the protection pressure plate status control of the booster station. Summary of the Invention

[0004] To address the technical problems existing in the prior art, this invention provides an intelligent monitoring and early warning method for the status of pressure plates in a 220kV substation, comprising the following steps: The system acquires the timing of the pressure plate auxiliary contact jump, the timing of the terminal block status arrival, the timing of the input status arrival, the timing of the protection input confirmation, and the timing of the background status reception during the commissioning verification. It calculates the segmented transmission time limit based on the adjacent time difference and determines the commissioning / exit identification benchmark based on the commissioning and exiting of the stable voltage range, thereby generating the pressure plate verification benchmark. Based on the pressure plate verification benchmark, the operating pressure plate number and the real-time voltage of the pressure plate auxiliary contact are obtained. The real-time voltage of the pressure plate auxiliary contact is compared with the engagement / disengagement identification benchmark. The action direction and action start time of the pressure plate are determined according to the voltage crossing direction, and the pressure plate action monitoring result is generated. Based on the pressure plate action monitoring results, the terminal block status, input status, protection input status and background reception status are read and compared with the pressure plate action direction. The arrival time of multiple statuses between the arrival time of the statuses and the start time of the action is calculated and compared with the segmented transmission time limit to generate the pressure plate link transmission result. Based on the transmission result of the pressure plate link, the abnormal segment name and pressure plate status information are determined. The abnormal segment name, the pressure plate number, the pressure plate movement direction and the pressure plate status information are combined to generate a pressure plate status warning result.

[0005] As a further aspect of the present invention, the process of generating the pressure plate calibration benchmark includes: Obtain the auxiliary contact jump record, terminal block status record, input status record, protection input confirmation record and background status reception record of the same pressure plate number during commissioning verification. Establish a corresponding relationship between multiple status records belonging to the same commissioning or exiting verification according to the record identifier, and mark the records that lack adjacent status records or have inconsistent status directions as records to be reviewed, and generate verification records. Calculate the segmented time from the auxiliary contact to the terminal block, from the terminal block to the input, from the input to the protection input, and from the protection input to the backend reception according to the chronological order of adjacent times in the verification record. Calculate the time deviation of multiple segments within the same segment relative to the average time of the same segment. The segmented time that does not exceed the preset deviation threshold and meets the verification count condition is taken as a valid segment sample. Based on the valid segment samples, the segmented transmission time limit is determined, and a pressure plate verification benchmark is generated.

[0006] As a further aspect of the present invention, the process of determining the segmented transmission time limit includes: Obtain valid segment samples of the same segment in multiple verification records, sort the valid segment samples in ascending order of duration, delete abnormally short-duration records at the beginning of the sort and abnormally long-duration records at the end of the sort, and determine the segment base duration based on the remaining valid segment samples. Obtain the preset margin duration, superimpose the segmented baseline duration with the preset margin duration, and write the superposition result into the time limit configuration item corresponding to the pressure plate number, action direction and segment name to obtain the segmented transmission time limit.

[0007] As a further aspect of the present invention, the process of generating the pressure plate action monitoring result includes: Obtain the running pressure plate number and the real-time voltage of the pressure plate auxiliary contact. Based on the pressure plate number, read the input judgment boundary, exit judgment boundary and voltage holding time corresponding to the current pressure plate from the pressure plate verification benchmark. Write the real-time voltage of the pressure plate auxiliary contact into the voltage timing record according to the sampling time. The real-time voltage of the auxiliary contact of the pressure plate at adjacent sampling times is compared with the input judgment boundary and the exit judgment boundary respectively. When the voltage change continuously crosses the corresponding judgment boundary and the holding time after crossing reaches the voltage holding time, the action direction and action start time of the pressure plate are determined, and the action monitoring result of the pressure plate is generated.

[0008] As a further aspect of the present invention, the process of determining the starting time of the action includes: Obtain continuous voltage sampling points before and after the voltage crossing occurs. Determine the last sampling point in the original state voltage range and the first sampling point entering the target state voltage range according to the sampling time sequence, and determine the sampling interval between the two sampling points as the crossing time period. Calculate the voltage change amplitude between the two sampling points. If the voltage change amplitude reaches a preset threshold, then the first sampling point that enters the target state voltage range is determined as the start time of the action.

[0009] As a further aspect of the present invention, the process of generating the pressure plate link transmission result includes: Obtain the pressure plate number, pressure plate movement direction, and movement start time from the pressure plate movement monitoring results. Based on the pressure plate number, read the terminal block status, input status, protection input status, and background receiving status. Determine the target arrival status corresponding to each of the multiple statuses according to the pressure plate movement direction. The terminal block status, the input status, the protection input status, and the background receiving status are compared with the target arrival status to obtain the status arrival time when the statuses are consistent. The status arrival time of the multiple status arrival times relative to the action start time is calculated, and the status arrival time is compared with the segmented transmission time limit to generate the pressure plate link transmission result.

[0010] As a further aspect of the present invention, the calculation process for the time taken to reach the state includes: Acquire the terminal block status arrival time, input status arrival time, protection input status arrival time and background reception status arrival time, filter the first status arrival time that is later than or equal to the action start time and whose status value is consistent with the corresponding action direction according to the pressure plate number and the pressure plate action direction, and generate a status arrival time sequence. Calculate the time difference between the arrival times of multiple states in the state arrival time sequence and the start time of the action, and establish the correspondence between the time difference and the state name according to the terminal block, input quantity, protection input and the link position of the background reception, and generate the state arrival time.

[0011] As a further aspect of the present invention, the process of generating the pressure plate status early warning result includes: Obtain the state direction comparison result, state arrival time and segment transmission time limit corresponding to the multiple segments in the pressure plate link transmission result, calculate the timeout deviation of the state arrival time of the multiple segments relative to the corresponding segment transmission time limit, and determine the corresponding segment as an abnormal segment and generate an abnormal segment record when the state direction is inconsistent, the timeout deviation is greater than zero or the state does not arrive within the preset reading period. Obtain the actual arrival status, target arrival status, and timeout deviation corresponding to the abnormal segment record. Determine the pressure plate status information based on the consistency between the arrival status and the target arrival status, whether the status arrives within a preset reading period, and the magnitude of the timeout deviation. Establish an association between the abnormal segment name and the pressure plate number, the pressure plate action direction, and the pressure plate status information to generate a pressure plate status early warning result.

[0012] As a further aspect of the present invention, the process of determining the pressure plate status information includes: The current status, target arrival status, status arrival time and segment transmission time limit of the multiple segments in the pressure plate link transmission result are obtained. According to the judgment conditions of inconsistent current status and target arrival status, status not arriving within the preset reading period, status arrival time exceeding segment transmission time limit and abnormal status arrival time sequence, the direction inconsistency status, status not arriving abnormal, transmission timeout status and transmission timing abnormal status are determined respectively. When the same pressure plate number corresponds to multiple abnormal states, the main state information is determined in the order of inconsistent direction state, state not reached abnormal state, transmission timing abnormal state, and transmission timeout state, and the remaining abnormal states are written into the additional state field to generate the pressure plate state information.

[0013] The 220kV substation pressure plate status intelligent monitoring and early warning system includes: The verification benchmark module is used to obtain the switching time of the pressure plate auxiliary contact, the arrival time of the terminal block status, the arrival time of the input status, the confirmation time of the protection input, and the reception time of the background status during the commissioning verification. It calculates the segmented transmission time limit according to the difference between adjacent time points, and determines the commissioning and decommissioning identification benchmark according to the commissioning and decommissioning of the stable voltage range. It generates the pressure plate verification benchmark and transmits it to the action monitoring module. The action monitoring module is used to obtain the running pressure plate number and the real-time voltage of the pressure plate auxiliary contact based on the pressure plate verification benchmark, compare the real-time voltage of the pressure plate auxiliary contact with the engagement / disengagement identification benchmark, determine the action direction and action start time of the pressure plate according to the voltage crossing direction, generate the pressure plate action monitoring result and transmit it to the link analysis module. The link analysis module is used to read the terminal block status, input status, protection input status and background receiving status based on the pressure plate action monitoring results, compare them with the pressure plate action direction, calculate the state arrival time between the arrival time of multiple states and the start time of the action, compare them with the segmented transmission time limit, generate the pressure plate link transmission result and transmit it to the early warning generation module. The early warning generation module is used to determine the abnormal segment name and pressure plate status information based on the pressure plate link transmission result, and combine the abnormal segment name, the pressure plate number, the pressure plate movement direction and the pressure plate status information to generate a pressure plate status early warning result.

[0014] Compared with the prior art, the advantages and positive effects of the present invention are as follows: In this invention, a verification benchmark is established around the transmission link between auxiliary contacts, terminal blocks, input signals, protection input signals, and backend reception regarding the action of the pressure plate. The time difference of the commissioning verification time is used to form segmented time limits, and the commissioning and decommissioning identification benchmarks are formed by entering and exiting the stable voltage range. During operation, the direction of action and the starting time are determined by the real-time voltage crossing direction. Then, the consistency of multiple state directions is compared synchronously with the arrival time, so that the pressure plate status judgment no longer stops at the terminal result, but identifies abnormal segments along the signal transmission path and combines the pressure plate number, action direction, and status information to generate early warnings. This can shorten the troubleshooting chain, reduce the risk of misjudgment and missed judgment, and improve the reliability of protection pressure plate operation monitoring and fault location. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a diagram illustrating the overall architecture of the intelligent status monitoring and early warning method of the present invention. Figure 2 This is a flowchart illustrating the construction of the pressure plate verification benchmark for this invention. Figure 3 This is a flowchart of the pressure plate action monitoring process of the present invention; Figure 4 This is a flowchart of the pressure plate link transmission analysis of the present invention; Figure 5 This is a flowchart for generating the pressure plate status early warning of the present invention. Detailed Implementation

[0017] The technical solution of the present invention will now be described with reference to the accompanying drawings.

[0018] This embodiment provides a method and system for intelligent monitoring and early warning of the status of protection pressure plates in a 220kV substation. During the continuous operation and monitoring of the protection pressure plates in a 220kV substation, the voltage of the pressure plate auxiliary contacts, the status of the terminal blocks, the status of input signals, the status of protection input signals, and the status received from the backend form a traceable data link according to the same pressure plate number. After the pressure plate is put into or taken out of service, each status is transmitted sequentially along the link of auxiliary contacts, terminal blocks, input signals, protection input signals, and backend reception. If any link is inconsistent in direction, arrives in an abnormal order, or takes longer than the corresponding configuration, an early warning result pointing to the abnormal segment is generated.

[0019] Method Implementation Examples Please see Figure 1 and Figure 2 The system acquires the switching time of the auxiliary contact of the pressure plate, the arrival time of the terminal block status, the arrival time of the input status, the confirmation time of the protection input, and the reception time of the background status during the commissioning verification. It calculates the segmented transmission time limit according to the adjacent time difference, and determines the commissioning and exiting identification benchmark according to the commissioning and exiting of the stable voltage range, and generates the pressure plate verification benchmark.

[0020] The pressure plate verification benchmark refers to the set of benchmark data formed during the commissioning verification phase and used in the operation monitoring phase. Its content includes the pressure plate number, action direction, engagement judgment boundary, exit judgment boundary, voltage holding duration, name of each link segment, and segment transmission time limit corresponding to the segment name. The pressure plate number is a unique business identifier used to distinguish different protection pressure plates within the same substation, derived from the consistent identifier field in the commissioning verification record and operation monitoring record. The pressure plate auxiliary contact jump time refers to the recorded moment when the voltage of the pressure plate auxiliary contact leaves the original stable voltage range and enters the target change process. The terminal block status arrival time, input status arrival time, protection input confirmation time, and background status reception time are the recorded moments when the corresponding link first presents a state consistent with the current action direction.

[0021] During commissioning verification, the auxiliary contact jump records, terminal block status records, input status records, protection input confirmation records, and background status reception records under the same pressure plate number are first collected. Then, based on the record identifier, a corresponding relationship is established between multiple status records belonging to the same commissioning verification or the same exit verification. The record identifier is a business mark that can represent the same commissioning and exit verification process, carrying the pressure plate number, action direction, verification batch status, and record sequence relationship. If a verification process lacks adjacent status records, or the action direction of adjacent status records is inconsistent with the jump direction of the pressure plate auxiliary contact, then the verification process is marked as a record to be reviewed. Records to be reviewed are not used as the basis for determining the segmented transmission time limit, but their pressure plate number, missing links, conflict states, and forming links are retained for subsequent manual verification or verification record correction.

[0022] For verification records that have been confirmed through corresponding relationships, the segmented time between adjacent states is determined according to the link sequence from auxiliary contact to terminal block, terminal block to input, input to protection input, and protection input to backend reception. Segmented time refers to the time interval between the arrival times of two adjacent link states in the same commissioning / discharging verification, which is derived from the time field in the verification record. Segmented transmission time limit refers to the configured time limit allowed for the segment to complete state transmission under the corresponding pressure plate number, action direction, and segment name. Its generation process does not use fixed empirical values, but is based on the segmented time in multiple valid verification records of the same segment. Abnormal short-time records and abnormal long-time records that deviate significantly from the normal transmission process of the link are excluded, and then the segmented base time is formed based on the remaining records. The preset margin time is then added and written into the time limit configuration item. The preset margin time is a configurable field determined by the substation protection pressure plate status monitoring rules, field verification procedures, or historical qualified verification records before commissioning verification. Its purpose is to absorb non-abnormal fluctuations in the sampling, transmission, recording, and status confirmation process, and it is not used as an abnormal judgment result alone.

[0023] When determining the engagement / disengagement identification criteria, the auxiliary contact voltage ranges formed under both the engaged and disengaged stable states for the same pressure plate number are read. The engaged stable voltage range refers to the voltage range formed when the pressure plate is engaged and the auxiliary contact voltage remains stable; the disengaged stable voltage range refers to the voltage range formed when the pressure plate is disengaged and the auxiliary contact voltage remains stable. The engagement and disengagement judgment boundaries are determined based on the boundary states of the corresponding stable voltage ranges and, together with the voltage holding time, constitute the engagement / disengagement identification criteria. The voltage holding time refers to the confirmation condition that the voltage needs to remain within the target stable voltage range after crossing the judgment boundary. It originates from the stability confirmation rules formed during commissioning verification or from pre-configured field settings and is used to eliminate false identifications caused by brief fluctuations, contact bounce, and sampling noise.

[0024] In this embodiment, multiple state records are linked together using the same pressure plate number and the same verification record identifier, so that auxiliary contacts, terminal blocks, input quantities, protection inputs and back-end reception form a continuous verification basis. This allows the pressure plate verification benchmark called during the operation phase to simultaneously include the direction identification boundary and segmented transmission constraints, avoiding the need to judge the pressure plate status based on a single state record.

[0025] Please see Figure 1 and Figure 3 Based on the pressure plate verification benchmark, the operating pressure plate number and the real-time voltage of the pressure plate auxiliary contact are obtained. The real-time voltage of the pressure plate auxiliary contact is compared with the engagement / disengagement identification benchmark. The action direction and start time of the pressure plate are determined according to the voltage crossing direction, and the pressure plate action monitoring results are generated.

[0026] The real-time voltage of the auxiliary contact of the pressure plate refers to the voltage value of the auxiliary contact continuously generated during operation, and it is written into the voltage timing record according to the pressure plate number and the sampling time. The voltage timing record is a set of records that saves the real-time voltage of the auxiliary contact and its status judgment results in order of sampling time, indexed by the pressure plate number. It carries fields such as sampling time, voltage status interval, crossing direction, hold confirmation status, and action start time. The pressure plate action monitoring result refers to the intermediate result formed after the pressure plate is identified to have engaged or disengaged during the operation phase. It includes the pressure plate number, pressure plate action direction, action start time, target status interval, and hold confirmation status, and serves as the input for subsequent link analysis.

[0027] During operation monitoring, the corresponding entry judgment boundary, exit judgment boundary, and voltage holding time are first read from the pressure plate calibration benchmark based on the pressure plate number. Then, the real-time voltage of the auxiliary contact at adjacent sampling times is compared with the entry judgment boundary and exit judgment boundary, respectively. If the voltage continuously crosses from the exit stable voltage range to the entry stable voltage range, and the voltage state after the crossing meets the holding confirmation condition, then the direction of this pressure plate action is determined to be the entry direction. If the voltage continuously crosses from the entry stable voltage range to the exit stable voltage range, and the voltage state after the crossing meets the holding confirmation condition, then the direction of this pressure plate action is determined to be the exit direction. If the voltage only briefly leaves the original stable voltage range and then returns, or if the voltage state after the crossing does not meet the holding confirmation condition, then this process is marked as a voltage fluctuation state, and no pressure plate action monitoring result is generated.

[0028] The determination of the action start time is based on continuous voltage sampling points before and after the crossing. First, the last sampling point in the original state voltage range is determined according to the sampling time sequence. Then, the first sampling point entering the target state voltage range is determined, and the continuous change process between the two sampling points is taken as the crossing time period. The preset crossing amplitude refers to the configuration condition used to confirm that the voltage has undergone a substantial change from the original state to the target state. It is derived from the voltage range boundary in the engagement / disengagement identification benchmark and the on-site anti-jitter rules. If there are multiple voltage change points within the crossing time period, the sampling time when the voltage change amplitude first reaches the preset crossing amplitude is selected as the action start time. If there are missing sampling points within the crossing time period, the crossing direction is determined by the formed continuous valid sampling points. At the same time, the sampling missing status is written into the action monitoring supplementary field. Subsequent link analysis reads this supplementary field when judging the transmission timing to avoid misjudging the sampling missing as a link status anomaly.

[0029] In the initial stage of operation, if a complete voltage timing record has not yet been formed for a certain pressure plate number, the initial state identification is based on the input and output stable voltage ranges in the pressure plate calibration benchmark. Once the continuous sampling records have covered the original state, the transition process, and the target state holding process, the stable operation identification rule is switched to. If the pressure plate number read during operation does not have a corresponding configuration in the pressure plate calibration benchmark, the action direction is not directly generated. Instead, the benchmark missing state is output, and the pressure plate number, real-time voltage, and sampling time are recorded. The process continues until the calibration benchmark is supplemented before entering the input / output identification process.

[0030] In this embodiment, by continuously comparing the crossing direction of the real-time voltage with the engagement / disengagement identification benchmark, and determining whether the action is valid by maintaining the confirmation condition, the pressure plate action monitoring results can exclude short-term jitter and transient changes in the contact, thereby providing a clear action direction and starting time for subsequent link status reading.

[0031] Please see Figure 1 and Figure 4 Based on the monitoring results of the pressure plate action, the terminal block status, input status, protection input status and background receiving status are read and compared with the direction of the pressure plate action. The actual segment time between the arrival times of two adjacent link statuses is calculated and compared with the segment transmission time limit to generate the pressure plate link transmission result.

[0032] Among them, terminal block status refers to the engaged or disengaged state reflected by the terminal block side when the pressure plate is activated; input status refers to the engaged or disengaged state presented by the corresponding input acquisition point; protection input status refers to the input status confirmed by the protection side; and background reception status refers to the pressure plate status received and formed by the background. Target arrival status refers to the state that is consistent with the direction of the current pressure plate action and should appear in the corresponding link link. Actual segmentation time refers to the time interval field between the arrival time of the current link status and the arrival time of the preceding adjacent link status. Pressure plate link transmission result refers to the link analysis result formed after judging the direction consistency, arrival sequence, and transmission time limit of each link of terminal block, input, protection input, and background reception. It includes pressure plate number, action direction, action start time, arrival time of each status, actual segmentation time, segment transmission time limit, status direction comparison result, and segmentation judgment result.

[0033] When performing link analysis, first read the pressure plate number, pressure plate action direction, and action start time from the pressure plate action monitoring results. Then, filter the terminal block status, input status, protection input status, and background reception status according to the pressure plate number, which are later than or equal to the action start time. For the input direction, the target arrival status is the status of each link link corresponding to the input; for the exit direction, the target arrival status is the status of each link link corresponding to the exit. The status direction comparison result is determined based on whether the current status and the target arrival status are consistent. When the current status and the target arrival status are consistent, the moment when the status first becomes consistent is determined as the arrival time of the corresponding status; when the current status never reaches the target arrival status, the link is marked as an unarrived status, and the last current status read within the reading cycle is retained as the actual arrival status field.

[0034] The segmented transmission time limit is matched according to the pressure plate number, action direction, and segment name. The arrival time of the terminal block state corresponds to the segment from the auxiliary contact to the terminal block; the transmission constraint of the input state relative to the terminal block state corresponds to the segment from the terminal block to the input quantity; the transmission constraint of the protection input state relative to the input quantity state corresponds to the segment from the input quantity to the protection input state; and the transmission constraint of the background receiving state relative to the protection input state corresponds to the segment from the protection input to the background receiving state. To ensure consistency of the comparison objects, the link analysis first determines the first valid arrival time of each link, then calculates the actual cascading difference time between adjacent links, and establishes the association between the state name, arrival time, actual segmented time, and corresponding segmented transmission time limit according to the link location. If the preceding state of a certain link has not arrived, even if the target state appears in the subsequent state, it is marked as an unconfirmed arrival state due to the missing preceding state, preventing the subsequent state from being used alone as the basis for normal link transmission.

[0035] The selection of state arrival times follows the rules of being after the action start point, consistent pressure plate number, consistent state value and action direction, and traceable record order. If duplicate state records appear in the same link within the reading cycle, the record that first meets the target arrival state is selected as the state arrival time, and subsequent duplicate records are kept as state retention records. If there is an abnormal sequence relationship in the state records, such as the subsequent link forming the target state before the preceding link, the link analysis does not directly discard the record, but writes it into the timing anomaly field, and retains the state name, preceding and following links, actual arrival state, and target arrival state in the pressure plate link transmission result, so that the warning generation stage can distinguish between transmission timeout and transmission timing anomaly.

[0036] In this embodiment, by reading the status of each link with the starting time of the action as the common starting point, and corresponding the status direction, status arrival time and segment transmission time limit according to the link position, the pressure plate link transmission result can indicate the specific occurrence of status not arriving, direction inconsistency, transmission timeout and timing abnormality, thereby providing a locatable link basis for the generation of early warning results.

[0037] Please see Figure 1 and Figure 5 Based on the transmission results of the pressure plate link, the abnormal segment name and pressure plate status information are determined. The abnormal segment name, pressure plate number, pressure plate action direction and pressure plate status information are combined to generate a pressure plate status early warning result.

[0038] Among them, the abnormal segment name refers to the name of the link segment that is determined not to meet the normal transmission conditions in the pressure plate link transmission result; the pressure plate status information refers to the status description field formed after classifying the causes of the abnormality; and the pressure plate status early warning result refers to the early warning record output by the pressure plate operation monitoring, which includes the abnormal segment name, pressure plate number, pressure plate action direction, pressure plate status information, actual arrival status, target arrival status, actual segment time, corresponding segment transmission time limit, and additional status fields. The additional status fields are used to save other abnormal states besides the main status information to avoid losing link details when multiple abnormalities exist for the same pressure plate number in the same action.

[0039] When an alert is generated, the system first reads the status direction comparison result, actual segment time, and segment transmission time limit from the pressure plate link transmission results, and then judges each segment according to its name. If the status direction of a segment is inconsistent with the pressure plate action direction, the segment is identified as a direction abnormal segment. If the status of a segment has arrived but the actual segment time exceeds the corresponding segment transmission time limit, the segment is identified as a transmission timeout segment. If a segment does not form a record consistent with the target arrival status within the preset reading period, the segment is identified as a non-arrived segment. If the arrival time of a subsequent segment is earlier than the arrival time of its predecessor segment, or if the predecessor segment has not arrived but the subsequent segment has formed the target status, the relevant segment is identified as a transmission timing abnormal segment. The preset reading period refers to the reading conditions set during operation monitoring to wait for the link status to arrive, which are derived from the pressure plate verification benchmark and the on-site monitoring strategy.

[0040] When determining the status information of the pressure plate, first read the current status, actual arrival status, target arrival status, actual segmentation time, and segmentation transmission time limit corresponding to the abnormal segment record. Then, based on the judgment conditions, form the inconsistency direction status, transmission timing abnormality status, and transmission timeout status. The inconsistency direction status corresponds to the situation where the current status or actual arrival status is inconsistent with the target arrival status; the transmission timing abnormality status corresponds to the situation where the arrival order of the link does not conform to the order of auxiliary contacts, terminal blocks, inputs, protection inputs, and background reception; the transmission timeout status corresponds to the situation where the status has arrived but the segmentation time exceeds the corresponding segmentation transmission time limit. When the same pressure plate number corresponds to multiple abnormal statuses, determine the main status information in the order of inconsistency direction status, transmission timing abnormality status, and transmission timeout status, and write the remaining abnormal statuses into the supplementary status field. If there is a non-arrival status and the non-arrival status also causes the subsequent status to be unconfirmed, the non-arrival status is written into the main status information or the priority position of the supplementary status field to maintain the directionality of the warning result to the link interruption location.

[0041] After the pressure plate status early warning result is generated, an association is established between the pressure plate number and the monitoring results of this pressure plate action and the pressure plate link transmission results. This allows the early warning result to be traced back to the start time of the action, the direction of the action, the actual arrival status of each link, and the transmission judgment of each segment. If the abnormal segment record is empty, no abnormal warning is generated; instead, a normal link transmission status is generated to close the current pressure plate action monitoring process. If there are missing benchmarks, missing samples, or records pending verification affecting the judgment result, the corresponding additional status is written into the pressure plate status early warning result. The early warning result still retains the confirmed abnormal segment name and pressure plate status information; unconfirmed parts do not replace the confirmed abnormal conclusions.

[0042] In this embodiment, by combining the abnormal segment name, pressure plate number, pressure plate action direction, and pressure plate status information into a structured early warning result, the early warning content can simultaneously express the location of the abnormality, the action direction, and the type of abnormality, thereby transforming the pressure plate status monitoring from a single-point status prompt to a link segment location prompt.

[0043] System Implementation Examples The calibration benchmark module is used to obtain the switching time of the pressure plate auxiliary contact, the arrival time of the terminal block status, the arrival time of the input status, the confirmation time of the protection input, and the reception time of the background status during the commissioning calibration. It calculates the segmented transmission time limit according to the adjacent time difference, and determines the commissioning and decommissioning identification benchmark according to the commissioning and decommissioning of the stable voltage range. It generates the pressure plate calibration benchmark and transmits it to the action monitoring module.

[0044] The input data for the verification benchmark module consists of multi-state records generated during the commissioning verification phase. The processed data includes pressure plate auxiliary contact tripping records, terminal block status records, input status records, protection input confirmation records, and background status reception records. The verification benchmark module organizes these records according to the pressure plate number, action direction, and record identifier, and marks records lacking adjacent status records or with inconsistent status directions as records awaiting verification. The verification benchmark module does not perform operating voltage jump identification; its output consists only of the pressure plate verification benchmark, records awaiting verification, and time limit configuration items. After receiving the pressure plate verification benchmark, the action monitoring module retrieves the input judgment boundary, output judgment boundary, voltage holding duration, and segmented transmission time limit according to the pressure plate number.

[0045] In this embodiment, the multi-state records of the commissioning verification stage are organized into a pressure plate verification benchmark that can be called by the operation monitoring through the verification benchmark module. This enables the action identification and link analysis in the operation stage to share the same pressure plate number, the same action direction, and the same segment configuration, thereby maintaining the consistency of data between commissioning verification and operation early warning.

[0046] The action monitoring module is used to obtain the running pressure plate number and the real-time voltage of the pressure plate auxiliary contact through the pressure plate verification benchmark, compare the real-time voltage of the pressure plate auxiliary contact with the engagement / disengagement identification benchmark, determine the action direction and action start time of the pressure plate according to the voltage crossing direction, generate the pressure plate action monitoring result and transmit it to the link analysis module.

[0047] After receiving the operating pressure plate number and the real-time voltage of the pressure plate auxiliary contacts, the action monitoring module generates a voltage timing record according to the sampling time and reads the corresponding engagement / disengagement identification benchmark from the pressure plate calibration benchmark output by the calibration benchmark module. The action monitoring module performs state interval judgment on the real-time voltage at adjacent sampling times. When the voltage crossing direction matches the engagement or disengagement judgment boundary, and the state after the crossing meets the hold confirmation condition, it generates a pressure plate action monitoring result. The action monitoring module does not read terminal block status, input status, protection input status, or background reception status; its output data is limited to pressure plate number, pressure plate action direction, action start time, target state interval, and hold confirmation status. After receiving this result, the link analysis module uses the action start time as the starting point for subsequent state readings.

[0048] In this embodiment, the action monitoring module converts the real-time voltage crossing process of the auxiliary contact into the action monitoring result of the pressure plate, so that the link analysis module does not need to repeatedly judge the voltage crossing process, thereby forming a clear data division between action recognition and link status analysis in the operation monitoring process.

[0049] The link analysis module is used to read the terminal block status, input status, protection input status and background receiving status through the pressure plate action monitoring results, compare them with the pressure plate action direction, calculate the actual segment time between the arrival times of two adjacent link statuses and compare them with the segment transmission time limit, generate the pressure plate link transmission result and transmit it to the early warning generation module.

[0050] The link analysis module receives the pressure plate action monitoring results from the action monitoring module and the segment transmission time limits provided by the verification benchmark module. Based on the pressure plate number, the link analysis module reads the terminal block status, input status, protection input status, and background reception status, and determines the target arrival status for each status according to the pressure plate action direction. The link analysis module judges the status direction, first arrival time, actual segmentation time, and link timing to form the pressure plate link transmission result. The link analysis module does not generate final warning content; its output is limited to the status direction comparison result, actual segmentation time, segment transmission time limit, segmentation judgment result, and timing anomaly field. After receiving the above fields, the warning generation module determines the abnormal segment name and pressure plate status information.

[0051] In this embodiment, the link analysis module establishes a correspondence between the status of each link and the starting time of the action, the direction of the action, and the segment transmission time limit, so that the warning generation module can directly read the link segment judgment result, thereby avoiding the need to re-screen the status and reorganize the timing during the warning generation stage.

[0052] The early warning generation module is used to determine the name of the abnormal segment and the status information of the pressure plate through the pressure plate link. It combines the abnormal segment name, pressure plate number, pressure plate action direction and pressure plate status information to generate the pressure plate status early warning result.

[0053] After receiving the pressure plate link transmission results from the link analysis module, the early warning generation module reads the status direction comparison results, actual segment time, segment transmission time limit, and timing anomaly fields according to the segment name, and determines the name of the abnormal segment based on this. The early warning generation module forms inconsistency status, transmission timing anomaly status, and transmission timeout status based on the consistency between the actual arrival status and the target arrival status, the exceedance of each segment time relative to the corresponding segment transmission time limit, and the order of status arrival times. When multiple abnormal states exist for the same pressure plate number, the early warning generation module determines the primary status information according to a preset priority order and writes the remaining abnormal states into the supplementary status field. The output of the early warning generation module is the pressure plate status early warning result, which is associated with the pressure plate action monitoring results and the pressure plate link transmission results using the same pressure plate number and the same action direction.

[0054] In this embodiment, the warning generation module performs anomaly classification and status combination on the link segmentation judgment results, so that the final output pressure plate status warning result can simultaneously retain the abnormal segment, action direction, main status information and additional status fields, thereby enabling operation and maintenance to locate the abnormal link along the pressure plate link and verify the corresponding status record.

[0055] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

A method for intelligent monitoring and early warning of the condition of pressure plates in a 1.220kV substation, characterized in that: Includes the following steps: The system acquires the timing of the pressure plate auxiliary contact jump, the timing of the terminal block status arrival, the timing of the input status arrival, the timing of the protection input confirmation, and the timing of the background status reception during the commissioning verification. It calculates the segmented transmission time limit based on the adjacent time difference and determines the commissioning / exit identification benchmark based on the commissioning and exiting of the stable voltage range, thereby generating the pressure plate verification benchmark. Based on the pressure plate verification benchmark, the operating pressure plate number and the real-time voltage of the pressure plate auxiliary contact are obtained. The real-time voltage of the pressure plate auxiliary contact is compared with the engagement / disengagement identification benchmark. The action direction and action start time of the pressure plate are determined according to the voltage crossing direction, and the pressure plate action monitoring result is generated. Based on the pressure plate action monitoring results, the terminal block status, input status, protection input status and background reception status are read and compared with the pressure plate action direction. The arrival time of multiple statuses between the arrival time of the statuses and the start time of the action is calculated and compared with the segmented transmission time limit to generate the pressure plate link transmission result. Based on the transmission result of the pressure plate link, the abnormal segment name and pressure plate status information are determined. The abnormal segment name, the pressure plate number, the pressure plate movement direction and the pressure plate status information are combined to generate a pressure plate status warning result.

2. The intelligent monitoring and early warning method for the condition of the pressure plate of a 220kV substation according to claim 1, characterized in that, The process of generating the pressure plate verification benchmark includes: Obtain the auxiliary contact jump record, terminal block status record, input status record, protection input confirmation record and background status reception record of the same pressure plate number during commissioning verification. Establish a corresponding relationship between multiple status records belonging to the same commissioning or exiting verification according to the record identifier, and mark the records that lack adjacent status records or have inconsistent status directions as records to be reviewed, and generate verification records. Calculate the segmented time from the auxiliary contact to the terminal block, from the terminal block to the input, from the input to the protection input, and from the protection input to the backend reception according to the chronological order of adjacent times in the verification record. Calculate the time deviation of multiple segments within the same segment relative to the average time of the same segment. The segmented time that does not exceed the preset deviation threshold and meets the verification count condition is taken as a valid segment sample. Based on the valid segment samples, the segmented transmission time limit is determined, and a pressure plate verification benchmark is generated.

3. The intelligent monitoring and early warning method for the condition of the pressure plate of a 220kV substation according to claim 2, characterized in that, The process of determining the segmented transmission time limit includes: Obtain valid segment samples of the same segment in multiple verification records, sort the valid segment samples in ascending order of duration, delete abnormally short-duration records at the beginning of the sort and abnormally long-duration records at the end of the sort, and determine the segment base duration based on the remaining valid segment samples. Obtain the preset margin duration, superimpose the segmented baseline duration with the preset margin duration, and write the superposition result into the time limit configuration item corresponding to the pressure plate number, action direction and segment name to obtain the segmented transmission time limit.

4. The intelligent monitoring and early warning method for the condition of the pressure plate of a 220kV substation according to claim 1, characterized in that, The process of generating the pressure plate motion monitoring results includes: Obtain the running pressure plate number and the real-time voltage of the pressure plate auxiliary contact. Based on the pressure plate number, read the input judgment boundary, exit judgment boundary and voltage holding time corresponding to the current pressure plate from the pressure plate verification benchmark. Write the real-time voltage of the pressure plate auxiliary contact into the voltage timing record according to the sampling time. The real-time voltage of the auxiliary contact of the pressure plate at adjacent sampling times is compared with the input judgment boundary and the exit judgment boundary respectively. When the voltage change continuously crosses the corresponding judgment boundary and the holding time after crossing reaches the voltage holding time, the action direction and action start time of the pressure plate are determined, and the action monitoring result of the pressure plate is generated.

5. The intelligent monitoring and early warning method for the condition of the pressure plate of a 220kV substation according to claim 4, characterized in that, The process of determining the starting time of the action includes: Obtain continuous voltage sampling points before and after the voltage crossing occurs. Determine the last sampling point in the original state voltage range and the first sampling point entering the target state voltage range according to the sampling time sequence, and determine the sampling interval between the two sampling points as the crossing time period. Calculate the voltage change amplitude between the two sampling points. If the voltage change amplitude reaches a preset threshold, then the first sampling point that enters the target state voltage range is determined as the start time of the action.

6. The intelligent monitoring and early warning method for the condition of the pressure plate of a 220kV substation according to claim 1, characterized in that, The process of generating the pressure plate link transmission result includes: Obtain the pressure plate number, pressure plate movement direction, and movement start time from the pressure plate movement monitoring results. Based on the pressure plate number, read the terminal block status, input status, protection input status, and background receiving status. Determine the target arrival status corresponding to each of the multiple statuses according to the pressure plate movement direction. The terminal block status, the input status, the protection input status, and the background receiving status are compared with the target arrival status to obtain the status arrival time corresponding to the status matching. The status arrival time of the multiple status arrival times relative to the action start time is calculated, and the status arrival time is compared with the segmented transmission time limit to generate the pressure plate link transmission result.

7. The intelligent monitoring and early warning method for the condition of the pressure plate of a 220kV substation according to claim 6, characterized in that, The calculation process for the time taken to reach the state includes: Acquire the terminal block status arrival time, input status arrival time, protection input status arrival time and background reception status arrival time, filter the first status arrival time that is later than or equal to the action start time and whose status value is consistent with the corresponding action direction according to the pressure plate number and the pressure plate action direction, and generate a status arrival time sequence. Calculate the time difference between the arrival times of multiple states in the state arrival time sequence and the start time of the action, and establish the correspondence between the time difference and the state name according to the terminal block, input quantity, protection input and the link position of the background reception, and generate the state arrival time.

8. The intelligent monitoring and early warning method for the condition of the pressure plate of a 220kV substation according to claim 1, characterized in that, The process of generating the pressure plate status early warning result includes: Obtain the state direction comparison result, state arrival time and segment transmission time limit corresponding to the multiple segments in the pressure plate link transmission result, calculate the timeout deviation of the state arrival time of the multiple segments relative to the corresponding segment transmission time limit, and determine the corresponding segment as an abnormal segment and generate an abnormal segment record when the state direction is inconsistent, the timeout deviation is greater than zero or the state does not arrive within the preset reading period. Obtain the actual arrival status, target arrival status, and timeout deviation corresponding to the abnormal segment record. Determine the pressure plate status information based on the consistency between the arrival status and the target arrival status, whether the status arrives within a preset reading period, and the magnitude of the timeout deviation. Establish an association between the abnormal segment name and the pressure plate number, the pressure plate action direction, and the pressure plate status information to generate a pressure plate status early warning result.

9. The intelligent monitoring and early warning method for the condition of the pressure plate of a 220kV substation according to claim 8, characterized in that, The process of determining the pressure plate status information includes: The current status, target arrival status, status arrival time and segment transmission time limit of the multiple segments in the pressure plate link transmission result are obtained. According to the judgment conditions of inconsistent current status and target arrival status, status not arriving within the preset reading period, status arrival time exceeding segment transmission time limit and abnormal status arrival time sequence, the direction inconsistency status, status not arriving abnormal, transmission timeout status and transmission timing abnormal status are determined respectively. When the same pressure plate number corresponds to multiple abnormal states, the main state information is determined in the order of inconsistent direction state, state not reached abnormal state, transmission timing abnormal state, and transmission timeout state, and the remaining abnormal states are written into the additional state field to generate the pressure plate state information. A 10.220kV substation pressure plate status intelligent monitoring and early warning system, characterized in that, The system is used to implement the intelligent monitoring and early warning method for the status of the 220kV substation pressure plate as described in any one of claims 1-9. The system includes: The verification benchmark module is used to obtain the switching time of the pressure plate auxiliary contact, the arrival time of the terminal block status, the arrival time of the input status, the confirmation time of the protection input, and the reception time of the background status during the commissioning verification. It calculates the segmented transmission time limit according to the difference between adjacent time points, and determines the commissioning and decommissioning identification benchmark according to the commissioning and decommissioning of the stable voltage range. It generates the pressure plate verification benchmark and transmits it to the action monitoring module. The action monitoring module is used to obtain the running pressure plate number and the real-time voltage of the pressure plate auxiliary contact based on the pressure plate verification benchmark, compare the real-time voltage of the pressure plate auxiliary contact with the engagement / disengagement identification benchmark, determine the action direction and action start time of the pressure plate according to the voltage crossing direction, generate the pressure plate action monitoring result and transmit it to the link analysis module. The link analysis module is used to read the terminal block status, input status, protection input status and background receiving status based on the pressure plate action monitoring results, compare them with the pressure plate action direction, calculate the state arrival time between the arrival time of multiple states and the start time of the action, compare them with the segmented transmission time limit, generate the pressure plate link transmission result and transmit it to the early warning generation module. The early warning generation module is used to determine the abnormal segment name and pressure plate status information based on the pressure plate link transmission result, and combine the abnormal segment name, the pressure plate number, the pressure plate movement direction and the pressure plate status information to generate a pressure plate status early warning result.

Images