Method for quickly locating plug-in cable branch joint fault
Patent Information
- Application Number
- CN202611310882.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-27
- Publication Date
- 2026-10-09
AI Technical Summary
[0004]本发明的目的在于，针对插拔式电缆分支接头可插拔接触界面薄弱、现有故障定位方法难以在故障孕育期不停电快速定位到具体插拔分支接头及插拔接触界面的问题，提供一种插拔式电缆分支接头故障快速定位方法、装置及存储介质，能够利用插拔接触界面状态参数结合多源征兆，按分支级、接头级、界面级逐级递进定位，快速锁定故障插拔分支接头及其插拔接触界面
[0017]与现有技术相比，本发明的有益效果在于：第一，本申请将插拔接触界面状态参数（接触电阻及其变化率）作为故障定位的关键判据，利用插拔式电缆分支接头特有的可插拔接触界面特性，能够直接表征插拔接触界面的劣化趋势，从而在接触不良、界面放电等故障孕育期即可捕捉到区别于健康状态的征兆，有利于在故障尚未发展成停电事故前实现早期定位。第二，本申请以健康基线为基准，将插拔接触界面状态参数与局放信号、接地环流、接头温度多源联合判断，任一征兆超过门槛即触发快速定位流程，并通过多源交叉确认抑制单源误报，有利于提高定位结果的可靠性。第三，本申请按分支级、接头级、界面级三级递进定位，先缩小故障所属分支范围，再定位故障插拔式电缆分支接头，最后判定故障位于插拔接触界面，定位粒度逐级细化且每级依据明确的物理量，有利于在不停电条件下快速锁定故障位置与故障类型。第四，本申请设置预设定位时间窗控制快速定位流程的耗时，并在定位后生成检修工单，有利于缩短故障处置准备时间。第五，本申请的三级递进定位与多源状态数据并非功能简单叠加：插拔式电缆分支接头故障孕育过程中，环流异常首先在分支尺度显现、局部放电与温度异常在接头尺度显现、接触电阻变化率与插拔接触界面温升在插拔接触界面尺度显现，三级定位分别依据与所在尺度相匹配的物理量，由粗到细逐级缩小定位范围并逐级增加定位粒度，构成与插拔式分支接头故障孕育规律相匹配的分层递进定位机制，能够在定位到插拔接触界面并区分故障类型的同时控制计算开销与定位耗时。
Smart Images
Figure CN122882894A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of power equipment condition monitoring and fault location technology, specifically to a method, device, and storage medium for rapid fault location of pluggable cable branch joints. Background Technology
[0002] Plug-in cable branch joints (also known as detachable T-type cable connectors) are common components in T-type branch connections of power distribution cables. Installed in ring main units, transformer substations, cable branch boxes, and other similar locations, they achieve electrical connection between the main cable and branch cables through the plug-and-play mechanism of the plug and socket. They are characterized by their detachability and ease of maintenance and replacement. The electrical connection of plug-in cable branch joints relies on the plug-and-play contact interface, formed by the contact between the plug conductor and the socket conductor under the action of an elastic clamping element. Affected by installation techniques, operating conditions, and environmental factors, the plug-and-play contact interface is the weakest link in the cable branching system: improper plugging / unplugging, oxidation of the contact surface, and aging or loosening of the elastic clamping element can all lead to increased contact resistance, causing partial discharge and overheating at the contact point, potentially resulting in insulation breakdown or burning failure.
[0003] Locating faults in pluggable cable branch joints presents unique challenges. On one hand, the branch system contains numerous joints and is densely packed with three-phase multi-branch systems, making early fault symptoms subtle. On the other hand, faults in pluggable cable branch joints typically undergo a gestation process: increased contact resistance, partial discharge, accumulated temperature rise, and insulation degradation. If the specific branch and pluggable joint where the fault occurs can be located promptly during this process, it can be addressed without power outages, preventing the fault from escalating into a blackout. Existing fault location methods are mostly oriented towards the entire cable: traveling wave location, broadband impedance spectrum location, pulse reflection location, etc. These methods require the fault to occur and form a clear fault point before distance measurement can be performed, and often necessitate power outages or offline detection, resulting in lengthy location times. Some solutions monitor partial discharge or temperature online at the cable joint, but these are mostly limited to single-point alarms or locating the discharge source at the joint level. They do not utilize the unique pluggable contact interface status information of pluggable cable branch joints, nor do they establish a layered rapid location capability from the branch level to the interface level, making it difficult to meet the need for rapid location during the fault gestation period. Furthermore, even after locating a specific joint, existing methods struggle to distinguish whether the fault occurs at the insertion / removal contact interface or in the joint's insulation: poor contact, interface discharge, and insulation degradation are difficult to differentiate based on the joint's appearance and conventional monitoring parameters, yet their corresponding repair and handling methods are drastically different. The former can be addressed by re-inserting or replacing the elastic clamping element, while the latter often requires joint replacement or even a power outage for maintenance. Current technologies primarily use online contact resistance monitoring for health assessment and early warning of joint contact conditions, failing to integrate it with multi-source indicators such as partial discharge, circulating current, and temperature for fault location, and lacking a layered, progressive fault location capability from branch to insertion / removal contact interface. Moreover, some cable joint fault diagnosis schemes based on multi-source data fusion only output a fault type judgment, failing to provide location information such as the branch where the fault occurs, the specific insertion / removal cable branch joint, and its insertion / removal contact interface. Operators still cannot directly pinpoint the repair target and implement differentiated treatment based on this information. Summary of the Invention
[0004] The purpose of this invention is to address the problem that the pluggable contact interface of pluggable cable branch joints is weak, and existing fault location methods are unable to quickly locate specific pluggable branch joints and pluggable contact interfaces without power interruption during the fault incubation period. This invention provides a method, device, and storage medium for rapid fault location of pluggable cable branch joints. It can utilize the state parameters of the pluggable contact interface combined with multi-source symptoms to locate faults step by step at the branch level, joint level, and interface level, and quickly pinpoint the faulty pluggable branch joint and its pluggable contact interface.
[0005] To achieve the above objectives, the present invention provides the following technical solution.
[0006] A method for rapid fault location of pluggable cable branch joints includes the following steps: First, multi-source status data of a pluggable cable branch joint group is acquired. The pluggable cable branch joint group includes multiple pluggable cable branch joints arranged along the main cable branch. Each pluggable cable branch joint has a pluggable contact interface. The multi-source status data includes the contact interface status parameters, partial discharge signal, grounding circulating current, and joint temperature of each pluggable cable branch joint. The contact interface status parameters are determined based on the contact voltage drop and current flowing through the pluggable cable branch joint to determine the contact resistance, and the contact resistance change rate is determined based on the contact resistance. Then, a health baseline is established for each pluggable cable branch joint, including a contact resistance baseline, a partial discharge baseline, a circulating current baseline, and a temperature baseline. Next, the multi-source status data of each pluggable cable branch joint is compared with the corresponding health baseline. When any status parameter of any pluggable cable branch joint exceeds the corresponding symptom threshold, a rapid fault location process is triggered. In the rapid location process, the location is progressively determined at the branch level, connector level, and interface level: At the branch level, the faulty branch is determined based on the current deviation between the grounding current of each branch and the corresponding current baseline; at the connector level, the faulty pluggable cable branch connector is identified within the faulty branch based on the partial discharge amplitude comparison, and connectors with partial discharge amplitudes exceeding a preset multiple of the partial discharge amplitudes of other pluggable cable branch connectors in the same branch are identified as faulty pluggable cable branch connectors; at the interface level, the fault is determined to be located at the pluggable contact interface based on the contact resistance change rate of the faulty pluggable cable branch connector and the temperature rise at the pluggable contact interface. Finally, the graded location results are cross-verified by multiple sources, and the location results are output, including the faulty branch, the faulty pluggable cable branch connector number, the fault location, and the fault type.
[0007] In one embodiment, the insertion / removal contact interface state parameters further include insertion / removal clamping state parameters, which are determined based on the degree of deviation of the insertion / removal depth or clamping force from the rated value; the contact resistance is determined based on the ratio of the contact voltage drop to the current passing through it.
[0008] Optionally, the symptom threshold includes a warning threshold and an alarm threshold; when the status parameter exceeds the warning threshold, a rapid location process is triggered and the status data acquisition frequency of the corresponding pluggable cable branch joint is increased; when the status parameter exceeds the alarm threshold, an alarm is immediately output and multi-source status data of the corresponding pluggable cable branch joint is continuously uploaded in real time.
[0009] In one implementation, in branch-level location, the circulation deviation between the grounding circulation current of each branch and the corresponding circulation current baseline is calculated. When the circulation deviation exceeds the circulation deviation threshold, the branch is identified as the branch to which the fault belongs.
[0010] In one embodiment, during connector-level positioning, faulty pluggable cable branch connectors are identified by multi-channel partial discharge arrival time difference positioning or partial discharge amplitude comparison; when partial discharge amplitude comparison is used, connectors whose partial discharge amplitude exceeds a preset multiple of the partial discharge amplitude of other pluggable cable branch connectors in the same branch are identified as faulty pluggable cable branch connectors.
[0011] In one embodiment, in interface-level positioning, the fault is determined to be located at the insertion / removal contact interface and the fault type is determined by comparing the contact resistance change rate with a preset contact resistance change rate threshold and the insertion / removal contact interface temperature rise with a preset interface temperature rise threshold. When the contact resistance change rate exceeds the preset contact resistance change rate threshold and the insertion / removal contact interface temperature rise rate exceeds the preset interface temperature rise rate threshold, the fault type is determined to be a poor contact fault.
[0012] In one embodiment, multi-source cross-confirmation includes: confirming a fault in the pluggable cable branch joint when at least two of the following status parameters—contact resistance, partial discharge signal, and joint temperature—simultaneously exceed the corresponding symptom threshold; and marking the pluggable cable branch joint as a suspected fault and increasing the monitoring frequency of the pluggable cable branch joint when only one status parameter exceeds the corresponding symptom threshold.
[0013] Optionally, the fast positioning process has a preset positioning time window, and the time from triggering the fast positioning process to outputting the positioning result does not exceed the preset positioning time window.
[0014] Optionally, after outputting the location results, the system may also include: generating a maintenance work order based on the location results. The maintenance work order includes the faulty branch, the faulty pluggable cable branch connector number, the fault type, and the recommended maintenance actions.
[0015] The present invention also provides a rapid fault location device for pluggable cable branch joints, including a sensing component and an edge processing unit. The sensing component is used to acquire multi-source status data of a pluggable cable branch joint group, which includes multiple pluggable cable branch joints arranged along the branches of the main cable. Each pluggable cable branch joint has a pluggable contact interface. The multi-source status data includes the contact interface status parameters, partial discharge signal, grounding circulating current, and joint temperature of each pluggable cable branch joint. The contact resistance is determined based on the contact voltage drop and current flowing through the two ends of the pluggable cable branch joint, and the contact resistance change rate is determined based on the contact resistance. The edge processing unit establishes a health baseline for each pluggable cable branch joint, including contact resistance baseline, partial discharge baseline, circulating current baseline, and temperature baseline. It compares the multi-source status data of each pluggable cable branch joint with the corresponding health baseline. When any status parameter of any pluggable cable branch joint exceeds the corresponding symptom threshold, a rapid location process is triggered. In the rapid location process, location is progressively advanced at the branch level, joint level, and interface level. At the branch level, the faulty branch is determined based on the circulating current deviation between the grounding circulating current of each branch and the corresponding circulating current baseline. At the joint level, the faulty pluggable cable branch joint is identified within the faulty branch based on a comparison of partial discharge amplitude. Joints with partial discharge amplitudes exceeding a preset multiple of the partial discharge amplitude of other pluggable cable branch joints in the same branch are identified as faulty pluggable cable branch joints. At the interface level, the fault is determined to be located at the pluggable contact interface based on the contact resistance change rate and the temperature rise at the pluggable contact interface. The hierarchical location results are cross-verified using multiple sources, and the location results are output, including the faulty branch, the faulty pluggable cable branch joint number, the fault location, and the fault type.
[0016] The present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-described method for rapid fault location of pluggable cable branch joints.
[0017] Compared with existing technologies, the advantages of this invention are as follows: First, this application uses the state parameters of the pluggable contact interface (contact resistance and its rate of change) as the key criterion for fault location. Utilizing the unique pluggable contact interface characteristics of pluggable cable branch joints, it can directly characterize the deterioration trend of the pluggable contact interface, thereby capturing signs that differ from the healthy state during the fault incubation period, such as poor contact and interface discharge. This is beneficial for early location before the fault develops into a power outage. Second, this application uses a healthy baseline as a benchmark and combines the state parameters of the pluggable contact interface with partial discharge signals, grounding current, and joint temperature for multi-source joint judgment. If any sign exceeds the threshold, a rapid location process is triggered, and multi-source cross-confirmation suppresses single-source false alarms, which helps improve the reliability of the location results. Third, this application uses a three-level progressive location method: branch level, joint level, and interface level. First, it narrows down the branch range to which the fault belongs, then locates the faulty pluggable cable branch joint, and finally determines that the fault is located at the pluggable contact interface. The location granularity is refined step by step, and each level is based on a clear physical quantity, which is beneficial for quickly locking the fault location and fault type under power outage conditions. Fourth, this application sets a preset positioning time window to control the time consumed in the rapid positioning process and generates a maintenance work order after positioning, which helps to shorten the preparation time for fault handling. Fifth, the three-level progressive positioning and multi-source status data of this application are not simply superimposed functions: in the process of fault incubation of pluggable cable branch joints, circulating current anomalies first appear at the branch scale, partial discharge and temperature anomalies appear at the joint scale, and contact resistance change rate and temperature rise at the pluggable contact interface scale appear at the pluggable contact interface scale. The three-level positioning is based on physical quantities that match the scale, gradually narrowing the positioning range from coarse to fine and gradually increasing the positioning granularity, forming a hierarchical progressive positioning mechanism that matches the fault incubation law of pluggable branch joints. It can control the calculation overhead and positioning time while locating the pluggable contact interface and distinguishing the fault type. Attached Figure Description
[0018] Figure 1 The provided actual attached diagram is a structural schematic of a pluggable cable branch joint fault rapid location system; Figure 2 The provided actual attached diagram is an overall flowchart of the method for rapid fault location of pluggable cable branch joints; Figure 3 The provided actual attached diagram is a flowchart illustrating the hierarchical and progressive positioning process. Labeling explanations: 1-Plug-in cable branch connector group, 11-Plug-in cable branch connector, 111-Plug-in contact interface, 12-Branch cable, 13-Main cable, 2-Sensing component, 21-Partial discharge sensor, 22-Current transformer, 23-Temperature sensor, 24-Circulating current sensor, 3-Edge processing unit, 4-Communication unit, 5-Platform end. Detailed Implementation
[0019] The embodiments of the present invention will now be described with reference to the accompanying drawings.
[0020] like Figure 1 As shown, the pluggable cable branch joint fault rapid location system of the present invention includes a pluggable cable branch joint group 1, a sensing component 2, an edge processing unit 3, a communication unit 4, and a platform terminal 5. The pluggable cable branch joint group 1 includes multiple pluggable cable branch joints 11 branched along the main cable 13. Each pluggable cable branch joint 11 is electrically connected to the main cable 13 via a branch cable 12. The pluggable cable branch joint 11 has an internal pluggable contact interface 111 formed by the contact between the plug conductor and the socket conductor under the action of an elastic clamping member. The sensing component 2 is located at each pluggable cable branch joint 11 and includes a partial discharge sensor 21 for detecting partial discharge signals, a current transformer 22 for detecting current flow, a temperature sensor 23 for detecting joint temperature, and a circulating current sensor 24 for detecting grounding circulating current. The edge processing unit 3 is used to execute the data processing and location decision steps in the fault rapid location method of the present invention, and the communication unit 4 is used to upload the location results and multi-source status data to the platform terminal 5. It should be noted that... Figure 1 The system architecture shown is a preferred embodiment of the present invention, and the specific selection of each component does not affect the scope of protection of the present invention.
[0021] For ease of explanation, the relevant symbols are defined as follows: ΔU is the contact voltage drop, I is the current, R is the contact resistance, vR is the rate of change of contact resistance, Δt is the adjacent sampling interval, t is the current time, Ig is the grounding circulating current, Ig0 is the circulating current baseline value, ΔIg is the circulating current deviation, Tj is the junction temperature, Ta is the ambient temperature, ΔT is the temperature difference, and P is the partial discharge amplitude.
[0022] like Figure 2 As shown, the method for rapid fault location of pluggable cable branch joints of the present invention includes the following steps.
[0023] Step S1: Acquire multi-source status data of the pluggable cable branch connector group 1. In this embodiment, for each pluggable cable branch connector 11, the state parameters of the pluggable contact interface, partial discharge signal, grounding circulating current, and connector temperature are acquired through the sensing component 2. The state parameters of the pluggable contact interface are determined based on the contact voltage drop across the pluggable cable branch connector 11 and the current flowing through it, and then the contact resistance change rate is determined based on the contact resistance. For example, the contact resistance R(t) = ΔU(t) / I(t), where ΔU(t) is the contact voltage drop across the pluggable cable branch connector 11 at time t, I(t) is the current flowing through the pluggable cable branch connector 11 at time t, and the contact voltage drop is determined by Ohm's law using a micro-voltage sampling circuit led out from the pluggable cable branch connector 11 combined with the current measured by the current transformer 22; the contact resistance change rate vR(t) = (R(t) − R(t − Δt)) / Δt, where Δt is the adjacent sampling interval, which is exemplarily taken as one second. The insertion / removal contact interface status parameters may also include insertion / removal clamping status parameters. These parameters are determined based on the deviation of the insertion / removal depth or clamping force of the pluggable cable branch connector 11 from its rated value. For example, the insertion / removal depth or clamping force can be obtained by a displacement sensor or pressure sensor located at the pluggable cable branch connector 11, and the deviation of the insertion / removal depth or clamping force from its rated value can be used as the insertion / removal clamping status parameters. Partial discharge signals are acquired by a partial discharge sensor 21, which can be a high-frequency current transformer or a transient ground voltage sensor. Grounding circulating current is acquired by a circulating current sensor 24. Connector temperature is acquired by a temperature sensor 23.
[0024] Step S2: Establish a health baseline for each pluggable cable branch joint 11. The health baseline includes contact resistance baseline, partial discharge baseline, circulating current baseline, and temperature baseline. For example, multi-source status data is collected for a period of time during the initial commissioning of the pluggable cable branch joint 11 or during a period of stable historical operation. The mean or median of each status parameter is taken as the corresponding baseline value; the contact resistance baseline is recorded as the reference value of contact resistance, the partial discharge baseline as the reference value of partial discharge amplitude, the circulating current baseline as the circulating current baseline value Ig0, and the temperature baseline as the reference value of the joint temperature. The health baseline can be updated periodically according to the operating conditions, or it can be updated when an instruction is issued from the platform terminal 5.
[0025] Step S3: Compare the multi-source status data of each pluggable cable branch connector 11 with the corresponding health baseline to determine if there are any fault symptoms. When any status parameter of any pluggable cable branch connector 11 exceeds the corresponding symptom threshold, a rapid location process is triggered. For example, the symptom threshold includes two levels: a warning threshold and an alarm threshold. When the contact resistance change rate exceeds the preset contact resistance change rate warning threshold, or the partial discharge amplitude exceeds the preset partial discharge warning threshold, or the grounding current deviation exceeds the preset circulating current warning threshold, or the connector temperature exceeds the preset temperature warning threshold, it is determined that the warning threshold has been exceeded, the rapid location process is triggered, and the status data acquisition frequency of the corresponding pluggable cable branch connector 11 is increased. When any status parameter exceeds the preset alarm threshold (higher than the corresponding warning threshold), an alarm is immediately output and the multi-source status data of the corresponding pluggable cable branch connector 11 is continuously uploaded in real time. For example, the contact resistance change rate warning threshold is set at 0.5% / min, and the contact resistance change rate alarm threshold is set at 2% / min; the partial discharge warning threshold is set at 100pC, and the partial discharge alarm threshold is set at 500pC; the circulating current deviation warning threshold is set at 20% of the circulating current baseline value; and the temperature warning threshold is set at a temperature difference of more than 5°C between the joint temperature and the ambient temperature. These values are exemplary and can be adjusted according to the cable type, joint structure, operating environment, and monitoring accuracy requirements.
[0026] Step S4: In the rapid positioning process, positioning is performed progressively at the branch level, connector level, and interface level, such as... Figure 3 As shown.
[0027] At the branch level, the branch to which the fault belongs is determined based on the circulating current deviation or abnormal branch current of each branch. For example, the circulating current deviation ΔIg(t) = Ig(t) − Ig0(t) between the grounding circulating current of each branch and the corresponding circulating current baseline value is calculated. When the circulating current deviation of a branch exceeds the circulating current deviation threshold, that branch is determined to be the faulty branch. Alternatively, the faulty branch can be determined based on abnormal sudden changes in the branch current. For example, the circulating current deviation threshold is taken as 30% of the circulating current baseline value.
[0028] At the connector level, within the branch to which the fault belongs, the faulty pluggable cable branch connector 11 is determined based on the partial discharge arrival time difference, partial discharge amplitude, or temperature deviation. For example, when using multi-channel partial discharge arrival time difference location, partial discharge signals are simultaneously collected at multiple pluggable cable branch connectors 11 within the branch to which the fault belongs. The connector where the discharge source is located is determined based on the time difference of the partial discharge signal arriving at each channel and the signal propagation speed. When using partial discharge amplitude comparison, the connector whose partial discharge amplitude P exceeds a preset multiple of the partial discharge amplitude of other pluggable cable branch connectors 11 in the same branch is identified as the faulty pluggable cable branch connector 11; for example, the preset multiple is three times. Alternatively, based on the deviation between the connector temperature and the temperature baseline of each pluggable cable branch connector 11, the connector with the largest temperature deviation is identified as the faulty pluggable cable branch connector 11.
[0029] At the interface level, the fault is determined to be located at the plug-in / plug-out contact interface based on the contact resistance change rate and the temperature rise at the plug-in / plug-out contact interface of the faulty plug-in / plug-out cable branch joint 11, and the fault type is determined accordingly. For example, the temperature rise at the plug-in / plug-out contact interface is determined based on the temperature difference ΔT(t) = Tj(t) − Ta(t) between the joint temperature Tj and the ambient temperature Ta. When the contact resistance change rate exceeds a preset contact resistance change rate threshold and the temperature rise rate at the plug-in / plug-out contact interface exceeds a preset interface temperature rise rate threshold, the fault type is determined to be a poor contact fault; when the contact resistance change rate does not exceed the preset contact resistance change rate threshold but the partial discharge signal exhibits interface discharge characteristics, the fault type is determined to be an interface discharge fault; when the partial discharge signal is accompanied by an abnormal increase in joint temperature, the fault type is determined to be an insulation degradation fault. It should be noted that the contact resistance change rate is affected by load current fluctuations, and using it alone may generate false alarms due to load changes. The temperature rise rate at the insertion / removal contact interface reflects the heat accumulation process at the contact point. Combining these two factors can distinguish between poor contact and load fluctuations: poor contact causes a continuous increase in contact resistance and a high interface temperature rise rate, while load fluctuations only cause the contact resistance to change slowly with current and a low interface temperature rise rate. This combined judgment provides a physical mechanism basis for interface-level location and fault type determination, rather than a simple comparison of a single threshold. For example, the preset contact resistance change rate threshold is 1% / min, and the preset interface temperature rise rate threshold is 1℃ / min. These values are exemplary and can be adjusted according to the connector structure and monitoring accuracy requirements.
[0030] Step S5: Perform multi-source cross-verification on the graded location results and output the location results. Multi-source cross-verification includes: when at least two of the following state parameters of the same pluggable cable branch connector 11—contact resistance, partial discharge signal, and connector temperature—simultaneously exceed the corresponding symptom threshold, the pluggable cable branch connector 11 is confirmed to be faulty; when only one state parameter exceeds the corresponding symptom threshold, the pluggable cable branch connector 11 is marked as a suspected fault, and the monitoring frequency of the pluggable cable branch connector 11 is increased. The location results include the faulty branch, the faulty pluggable cable branch connector 11 number, the fault location (plug-in contact interface), and the fault type.
[0031] In one implementation, the rapid positioning process has a preset positioning time window. The time from triggering the rapid positioning process to outputting the positioning result does not exceed the preset positioning time window. For example, the preset positioning time window is five minutes to ensure the timeliness of fault handling. The above values are exemplary values and can be adjusted according to operational requirements.
[0032] In one implementation, after outputting the location result, the platform terminal 5 generates a maintenance work order based on the location result. The maintenance work order includes the faulty branch, the faulty pluggable cable branch connector 11 number, the fault type, and suggested maintenance actions. Suggested maintenance actions include, for example, re-plugging and replacing the elastic clamping part for poor contact faults, replacing the pluggable cable branch connector 11 for interface discharge faults, and power outage maintenance for insulation deterioration faults. The platform terminal 5 pushes the maintenance work order to the operation and maintenance terminal.
[0033] In one implementation, the platform 5 can also send parameter configuration information to the edge processing unit 3. The parameter configuration information includes at least one of the following: symptom threshold, circulation deviation threshold, partial discharge amplitude multiple, and preset positioning time window. The edge processing unit 3 updates the judgment rules for fault symptom judgment and hierarchical progressive positioning according to the parameter configuration information, thereby supporting operators to remotely adjust the positioning strategy according to the season, load characteristics and operating experience.
[0034] The specific values of threshold, multiple, and time window in the above embodiments are all exemplary values. In actual implementation, they can be adjusted according to the joint structure, operating environment, and monitoring accuracy requirements. The scope of protection of this invention is defined by the claims.
Claims
1. A method for rapid fault location of a pluggable cable branch joint, characterized in that, Includes the following steps: Acquire multi-source status data of a pluggable cable branch connector group, the pluggable cable branch connector group including multiple pluggable cable branch connectors arranged along the main cable branch, the pluggable cable branch connector having a pluggable contact interface, the multi-source status data including the pluggable contact interface status parameters, partial discharge signal, grounding circulating current and connector temperature of each pluggable cable branch connector, wherein the pluggable contact interface status parameters determine the contact resistance based on the contact voltage drop and the current passing through the two ends of the pluggable cable branch connector, and determine the contact resistance change rate based on the contact resistance; A health baseline is established for each pluggable cable branch joint, including a contact resistance baseline, a partial discharge baseline, a circulating current baseline, and a temperature baseline. The multi-source status data of each pluggable cable branch joint are compared with the corresponding health baseline. When any status parameter of any pluggable cable branch joint exceeds the corresponding symptom threshold, a rapid location process is triggered. In the rapid location process, the location is progressively advanced at the branch level, joint level, and interface level: at the branch level, the branch to which the fault belongs is determined based on the circulating current deviation between the grounding circulating current of each branch and the corresponding circulating current baseline. At the connector level, within the branch to which the fault belongs, the faulty pluggable cable branch connector is determined by comparing the partial discharge amplitude. The connector whose partial discharge amplitude exceeds the partial discharge amplitude of other pluggable cable branch connectors in the same branch by a preset multiple is identified as the faulty pluggable cable branch connector. At the interface level, the fault is determined to be located at the plug-in contact interface based on the contact resistance change rate and the temperature rise at the plug-in contact interface of the faulty plug-in cable branch joint. The hierarchical location results are cross-verified from multiple sources, and the location results are output. The location results include the fault branch, the fault pluggable cable branch joint number, the fault location, and the fault type.
2. The method for rapid fault location of pluggable cable branch joints according to claim 1, characterized in that, The insertion / removal contact interface state parameters also include insertion / removal clamping state parameters, which are determined based on the degree of deviation of the insertion / removal depth or clamping force from the rated value; the contact resistance is determined based on the ratio of the contact voltage drop to the current passing through it.
3. The method for rapid fault location of pluggable cable branch joints according to claim 1, characterized in that, The symptom thresholds include a warning threshold and an alarm threshold; when the status parameter exceeds the warning threshold, the rapid positioning process is triggered and the status data acquisition frequency of the corresponding pluggable cable branch joint is increased; when the status parameter exceeds the alarm threshold, an alarm is immediately output and multi-source status data of the corresponding pluggable cable branch joint is continuously uploaded in real time.
4. The method for rapid fault location of pluggable cable branch joints according to claim 1, characterized in that, In branch-level location, the circulation deviation between the grounding circulation current of each branch and the corresponding circulation current baseline is calculated. When the circulation deviation exceeds the circulation deviation threshold, the branch is determined to be the branch to which the fault belongs. Alternatively, the branch to which the fault belongs can be determined based on the abnormal branch current.
5. The method for rapid fault location of pluggable cable branch joints according to claim 1, characterized in that, In the joint-level positioning, the faulty pluggable cable branch joint is also determined by multi-channel partial discharge arrival time difference positioning, or by the temperature deviation between the joint temperature of each pluggable cable branch joint and the temperature baseline.
6. The method for rapid fault location of pluggable cable branch joints according to claim 1, characterized in that, In interface-level positioning, based on the comparison between the contact resistance change rate and the preset contact resistance change rate threshold, and the comparison between the temperature rise of the insertion / removal contact interface and the preset interface temperature rise threshold, it is determined whether the fault is located at the insertion / removal contact interface and the fault type is determined; when the contact resistance change rate exceeds the preset contact resistance change rate threshold and the temperature rise rate of the insertion / removal contact interface exceeds the preset interface temperature rise rate threshold, the fault type is determined to be a poor contact fault.
7. The method for rapid fault location of pluggable cable branch joints according to claim 6, characterized in that, The multi-source cross-confirmation includes: confirming a fault in the pluggable cable branch joint when at least two of the status parameters of the contact resistance, the partial discharge signal, and the joint temperature of the same pluggable cable branch joint simultaneously exceed the corresponding symptom threshold; and marking the pluggable cable branch joint as a suspected fault and increasing the monitoring frequency of the pluggable cable branch joint when only one status parameter exceeds the corresponding symptom threshold.
8. The method for rapid fault location of pluggable cable branch joints according to claim 1, characterized in that, The rapid positioning process has a preset positioning time window, and the time from triggering the rapid positioning process to outputting the positioning result does not exceed the preset positioning time window.
9. The method for rapid fault location of pluggable cable branch joints according to claim 1, characterized in that, After outputting the location result, the process also includes: generating a maintenance work order based on the location result, wherein the maintenance work order includes the faulty branch, the faulty pluggable cable branch connector number, the fault type, and the recommended maintenance actions.
10. A quick fault location device for pluggable cable branch joints, characterized in that, include: A sensing component is used to acquire multi-source status data of a pluggable cable branch connector group, the pluggable cable branch connector group including multiple pluggable cable branch connectors arranged along the main cable branch, the pluggable cable branch connectors having pluggable contact interfaces, the multi-source status data including pluggable contact interface status parameters, partial discharge signal, grounding circulating current and connector temperature of each pluggable cable branch connector, wherein the pluggable contact interface status parameters determine the contact resistance based on the contact voltage drop and the current passing through the two ends of the pluggable cable branch connector, and determine the contact resistance change rate based on the contact resistance; An edge processing unit is used to establish a health baseline for each pluggable cable branch joint, the health baseline including a contact resistance baseline, a partial discharge baseline, a circulating current baseline, and a temperature baseline; compare the multi-source status data of each pluggable cable branch joint with the corresponding health baseline; and trigger a rapid location process when any status parameter of any pluggable cable branch joint exceeds the corresponding symptom threshold; in the rapid location process, the location is progressively advanced at the branch level, joint level, and interface level; at the branch level, the faulty branch is determined based on the circulating current deviation between the grounding circulating current of each branch and the corresponding circulating current baseline; at the joint level, the faulty pluggable cable branch joint is determined within the faulty branch based on the comparison of partial discharge amplitude; the joint with a partial discharge amplitude exceeding a preset multiple of the partial discharge amplitude of other pluggable cable branch joints in the same branch is determined as the faulty pluggable cable branch joint; at the interface level, the fault is determined to be located at the pluggable contact interface based on the contact resistance change rate and the temperature rise of the pluggable contact interface of the faulty pluggable cable branch joint. The hierarchical location results are cross-verified from multiple sources and the location results are output. The location results include the fault branch, the fault pluggable cable branch joint number, the fault location, and the fault type.
11. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the method for rapid fault location of pluggable cable branch joints as described in any one of claims 1 to 9.