CN117110794A - Intelligent diagnosis system and method for cable faults - Google Patents
Intelligent diagnosis system and method for cable faults Download PDFInfo
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- CN117110794A CN117110794A CN202311313734.0A CN202311313734A CN117110794A CN 117110794 A CN117110794 A CN 117110794A CN 202311313734 A CN202311313734 A CN 202311313734A CN 117110794 A CN117110794 A CN 117110794A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The application discloses a cable fault intelligent diagnosis system and a method, comprising the steps of acquiring and integrating transmission limiting thresholds of set safety cable voltage and current in a distribution line according to environmental temperature and insulation resistance values when different cable cross-sectional areas are arranged in the distribution line, and obtaining a transmission curve graph of the cable voltage and the current of the reference distribution line in unit time; taking the transmission curve graph of the reference distribution line cable voltage and the current in unit time as reference comparison data, monitoring the change of the line environment temperature and the insulation resistance value of the received cable voltage and the current at the position to be checked by using a set short, medium and long line model, judging whether the cable voltage and the current at the position to be checked are abrupt cable voltage and current or not, and sending line fault signals aiming at the abrupt cable voltage and the abrupt cable current; the application also provides the intelligent processing method for the distribution line data by adopting different models and algorithms, thereby improving the efficiency of monitoring the distribution line.
Description
Technical Field
The application relates to the field of distribution line monitoring, in particular to an intelligent diagnosis system and method for cable faults.
Background
In recent years, with the popularization of smart cables, the application range of the cables is also becoming wider and wider. In order to ensure the normal operation of the cable equipment, the operation condition of the cable needs to be effectively monitored so as to find potential safety hazards at the first time and correspondingly perform early warning so as to remove the potential hazards.
In the prior art, as disclosed in patent CN102798802B, a cable fault positioning visual simulation test method comprises the steps of establishing a cable three-dimensional model by utilizing a virtual reality technology, importing a cable simulation mathematical model of a tested cable, and establishing a corresponding relation between the cable three-dimensional model and the cable simulation mathematical model; establishing an instrument three-dimensional model for detecting the tested cable by utilizing a virtual reality technology, leading in an instrument simulation mathematical model of a cable fault positioning test instrument, and establishing a corresponding relation between the instrument three-dimensional model and the instrument simulation mathematical model; and (3) operating a simulation system, and calling the cable model and the instrument model to perform a visual simulation test. However, in the case of diversification of cable types and cable faults at present, a comparison mode is established through a single three-dimensional model so as to not comprehensively solve cable fault investigation, and improvement is needed.
Disclosure of Invention
The application provides an intelligent diagnosis system and method for cable faults, which aim to overcome the defects of the prior art in the background technology.
The application provides an intelligent diagnosis method for cable faults, which comprises the following steps:
step T1: acquiring and integrating transmission limiting thresholds of set safety cable voltage and current in a distribution line according to ambient temperature and insulation resistance values when different cable cross-sectional areas are formed in the distribution line, and carrying out curve depiction on the set safety cable voltage and current according to the transmission limiting thresholds of the set safety cable voltage and current obtained through integration to obtain a transmission curve graph of the cable voltage and current of the reference distribution line in unit time;
step T2: taking the transmission curve graph of the reference distribution line cable voltage and the current in unit time as reference comparison data, monitoring the change of the line environment temperature and the insulation resistance value of the received cable voltage and the current at the position to be checked by using a set short, medium and long line model, judging whether the cable voltage and the current at the position to be checked are abrupt cable voltage and current or not, and sending line fault signals aiming at the abrupt cable voltage and the abrupt cable current;
step T3: judging whether the abrupt cable voltage and current are misjudged by using the set short, medium and long circuit models, if so, eliminating the circuit fault signal and executing the step T4, and if not, executing the step T5;
step T4: constructing a distribution line safety management platform, judging whether the cable voltage and the current at the position to be checked belong to the safety distribution line cable voltage and the current by the intelligent diagnosis system background, if so, adding the cable voltage and the current at the position to be checked into the distribution line safety management platform, and if not, executing a step T5;
step T5: and placing the abrupt change cable voltage and current into an intelligent diagnosis system for self-adapting line environment temperature and insulation resistance value change response and line environment temperature and insulation resistance value change processing scheme generation, extracting abnormal data of the abrupt change cable voltage and current, and constructing a fault source monitoring node management platform according to the abnormal data.
The system operates by classifying and setting abrupt cable voltage and current, transmitting basic pure electromotive force information in an off-line state, forming an independent identification library, wherein the independent identification library is in the off-line state, mainly extracting corresponding information from the independent identification library during comparison each time, classifying the abrupt cable voltage and current according to flow steps, transmitting a limited threshold value through extracting the electromotive force information, classifying according to false alarm data, distribution line safety information data and fault source monitoring node information data, and independently forming a data set.
In a specific embodiment, the transmission defining threshold comprises: line starting and ending point loss value, fluctuation value of cable voltage and current unit time and reactive power value of line unit mileage.
In a specific embodiment, the curve-describing the set safety cable voltage and the current according to the transmission limiting threshold value of the set safety cable voltage and the current obtained by integration to obtain a transmission curve chart of the cable voltage and the current of the reference distribution line in unit time specifically includes:
constructing a periodic variation equation by utilizing the transmission limiting threshold value of the set safety cable voltage and the set safety cable current, carrying out variation calculation on the set safety cable voltage and the set safety cable current according to unit time, and storing the periodic variation equation as a transmission curve graph of the cable voltage and the set safety cable current in unit time of a reference distribution line;
the periodic variation equation has the expression:
wherein,the method is characterized in that the method comprises the steps of representing a cable voltage and current change function, lambda represents a cable voltage and current change factor, J represents a number of unit time, J represents the total number of unit time, gc represents a cable voltage and current change artificial factor matrix, du represents a cable voltage and current change natural factor matrix, xi and omega represent artificial factors and natural factor weights respectively, and the method comprises the steps of>Transmission limiting threshold value representing cable voltage and current, < ->The transmission of the cable voltage and current defines a threshold fluctuation range.
And constructing the transmission curve graph of the cable voltage and the current of the reference distribution line in unit time and the periodic change equation into a standard cable voltage and current integration comparison table.
In a specific embodiment, the construction of the distribution line safety management platform is directly set according to the access of the background of the intelligent diagnosis system, and the cable voltage and current data of the distribution line safety management platform are calculated according to the change of the cable arrangement quantity.
In a specific embodiment, the step T2 specifically includes:
constructing a short, medium and long circuit model calculation unit according to the reference comparison data and unit time;
collecting electromotive force information of a starting point and a finishing point of a distribution line, and carrying out security analysis on the distribution line;
checking starting and ending point electromotive force information of the cable voltage and the current at the position to be checked by using a corresponding characteristic matching algorithm, and judging problems including data jump and acquisition errors in the starting and ending point electromotive force information;
and checking the starting and ending point electromotive force information by using the set short, medium and long circuit models, judging that the starting and ending point electromotive force information is abrupt cable voltage and current when the information in the starting and ending point electromotive force information is matched with the set parameters in the short, medium and long circuit models, sending out a circuit fault signal, and transmitting the circuit fault signal to an intelligent diagnosis system engineer end for display.
In a specific embodiment, the short, medium and long line model specifically includes: and identifying the data size, the fluctuation condition, the fluctuation reason and the distribution line risk according to the set rule for the starting and ending electromotive force information of the cable voltage and the current at the position to be checked.
In a specific embodiment, the step T3 specifically includes:
and judging the influence factors of the cable voltage and the current at the position to be checked, which are monitored by the setting rule, comparing the monitoring node information with the transmission curve graph of the cable voltage and the current of the reference distribution line in unit time, carrying out distribution line risk identification, and judging whether the abrupt change cable voltage and the current are misjudged according to the maximum value which is preset and is used for judging the cable voltage and the current of the safety distribution line.
In a specific embodiment, the step T4 specifically includes:
setting a data processing period, timing according to the period, and reminding an intelligent diagnosis system to process the voltage and the current of the cable at the position to be checked;
the intelligent diagnosis system carries out real-time remote processing on the cable voltage and the current of the position to be checked in the time range, and when the intelligent diagnosis system processes the cable voltage and the current of the position to be checked into the cable voltage and the current of the safety distribution line, the transmission limiting threshold value of the cable voltage and the current of the position to be checked is extracted and recorded in the safety management platform of the distribution line;
if a transmission limiting threshold value of the cable voltage and the current of the position to be checked, which are received subsequently, exists in the distribution line safety management platform, the intelligent diagnosis system is not reminded to process the cable voltage and the current of the position to be checked;
and if the intelligent diagnosis system does not process the cable voltage and the cable current at the position to be checked after the timing is finished, executing a step T5.
The alarm information formed by the distribution line safety management platform is timing setting, and the alarm operation is active operation of the intelligent diagnosis system.
In a specific embodiment, the step T5 specifically includes:
performing cluster model analysis and classification on all abrupt cable voltages and currents to obtain if a plurality of cluster branches are involved, and comparing a transmission limiting threshold value of each cluster branch with a transmission limiting threshold value stored in the fault source monitoring node management platform;
if the same transmission limiting threshold value is compared, the corresponding abrupt cable voltage and current are directly fed back to the intelligent diagnosis system to carry out self-adaptive line environment temperature and insulation resistance value change response and line environment temperature and insulation resistance value change processing scheme generation;
if the same transmission limiting threshold value is not compared, judging that the corresponding abrupt cable voltage and current are the novel line environment temperature and insulation resistance value change cable voltage and current, performing feature extraction according to electromotive force information of the abrupt cable voltage and current, storing the extracted transmission limiting threshold value into the fault source monitoring node management platform, and performing self-adaptive line environment temperature and insulation resistance value change response and line environment temperature and insulation resistance value change processing scheme generation by the synchronous response intelligent diagnosis system;
and generating similar line environment temperature and insulation resistance value change alarms for the abrupt cable voltages and currents belonging to the same clustering branch, and dividing the abrupt cable voltages and currents belonging to the same clustering branch into the same type of cable voltage and current data according to the transmission limiting threshold.
The application divides the alarms with the same transmission limit threshold value, thereby further reducing the quantity of alarm information.
The application provides an intelligent diagnosis system for cable faults, which comprises:
referring to the distribution line cable voltage and current integration unit: the method comprises the steps of configuring transmission limiting thresholds for set safety cable voltage and current in a distribution line according to ambient temperature and insulation resistance values when different cable cross-sectional areas are arranged in the distribution line, and carrying out curve depiction on the set safety cable voltage and current according to the transmission limiting thresholds for the set safety cable voltage and current obtained through integration to obtain a transmission curve graph of the cable voltage and current of the reference distribution line;
abrupt cable voltage and current identification unit: the method comprises the steps of configuring a transmission curve graph of the voltage and the current of the reference distribution line in unit time as reference comparison data, monitoring the change of the line environment temperature and the insulation resistance value of the received voltage and the current of the cable at the position to be checked by utilizing a set short, medium and long line model, judging whether the voltage and the current of the cable at the position to be checked are abrupt cable voltage and abrupt current, and sending line fault signals aiming at the abrupt cable voltage and the abrupt current;
fault judging and supervising unit: the system comprises a fault source monitoring node management platform establishing unit, a power distribution line safety information identifying and monitoring unit, a fault source monitoring node management platform establishing unit and a power distribution line safety information identifying and monitoring unit, wherein the power distribution line safety information identifying and monitoring unit is configured to be used for judging whether the voltage and the current of the abrupt change cable are misjudged by using set short, middle and long line models;
distribution line safety information identification monitoring unit: the intelligent diagnosis system background judges whether the cable voltage and the current at the position to be checked belong to the safety distribution line cable voltage and the current, if so, the cable voltage and the current at the position to be checked are added into the distribution line safety management platform, and if not, a fault source monitoring node management platform building unit is executed;
the fault source monitoring node management platform building unit: the fault source monitoring node management platform is configured to put the abrupt cable voltage and current into an intelligent diagnosis system for self-adaptive line environment temperature and insulation resistance value change response and line environment temperature and insulation resistance value change processing scheme generation, extract abnormal data of the abrupt cable voltage and current, and construct a fault source monitoring node management platform according to the abnormal data.
The beneficial effects are that:
the application provides an intelligent diagnosis system and method for cable faults, wherein the system monitors cable voltage and current of a distribution line to construct a distribution line safety management platform and a fault source monitoring node management platform, and carries out data size, fluctuation condition, fluctuation reason and distribution line risk identification on starting and ending electromotive force information of the cable voltage and current at a position to be checked according to a set rule.
Drawings
The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and together with the description serve to explain the principles of the application. Many of the intended advantages of other embodiments and embodiments will be readily appreciated as they become better understood by reference to the following detailed description. Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:
FIG. 1 is a flow chart illustrating the operation of a cable fault intelligent diagnostic method of the present application;
fig. 2 is a block diagram of a cable fault intelligent diagnosis system according to the present application.
Detailed Description
The application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be noted that, for convenience of description, only the portions related to the present application are shown in the drawings.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
An intelligent diagnosis method for cable faults according to an embodiment of the present application is shown in fig. 1, which is an operation flow chart of the intelligent diagnosis method for cable faults according to the embodiment of the present application. The system operation comprises the following steps:
step T1: and acquiring and integrating transmission limiting thresholds of set safety cable voltage and current in the distribution line according to the ambient temperature and insulation resistance values when different cable cross-sectional areas are formed in the distribution line, and carrying out curve depiction on the set safety cable voltage and current according to the integrated transmission limiting thresholds of the set safety cable voltage and current to obtain a transmission curve graph of the cable voltage and current of the reference distribution line in unit time.
In a specific embodiment, the transmission defining threshold comprises: line starting and ending point loss value, fluctuation value of cable voltage and current unit time and reactive power value of line unit mileage.
In a specific embodiment, the curve-describing the set safety cable voltage and the current according to the transmission limiting threshold value of the set safety cable voltage and the current obtained by integration to obtain a transmission curve chart of the cable voltage and the current of the reference distribution line in unit time specifically includes:
constructing a periodic variation equation by utilizing the transmission limiting threshold value of the set safety cable voltage and the set safety cable current, carrying out variation calculation on the set safety cable voltage and the set safety cable current according to unit time, and storing the periodic variation equation as a transmission curve graph of the cable voltage and the set safety cable current in unit time of a reference distribution line;
the periodic variation equation has the expression:
wherein,the method is characterized in that the method comprises the steps of representing a cable voltage and current change function, lambda represents a cable voltage and current change factor, J represents a number of unit time, J represents the total number of unit time, gc represents a cable voltage and current change artificial factor matrix, du represents a cable voltage and current change natural factor matrix, xi and omega represent artificial factors and natural factor weights respectively, and the method comprises the steps of>Transmission limiting threshold value representing cable voltage and current, < ->Representing cable voltageAnd the transmission of the current defines a threshold fluctuation range.
And constructing the transmission curve graph of the cable voltage and the current of the reference distribution line in unit time and the periodic change equation into a standard cable voltage and current integration comparison table.
Step T2: and taking the transmission curve graph of the reference distribution line cable voltage and the current in unit time as reference comparison data, monitoring the change of the line environment temperature and the insulation resistance value of the received cable voltage and the current at the position to be checked by using the set short, medium and long line models, judging whether the cable voltage and the current at the position to be checked are abrupt cable voltage and current or not, and sending line fault signals aiming at the abrupt cable voltage and the abrupt cable current.
In a specific embodiment, the step T2 specifically includes:
constructing a short, medium and long circuit model calculation unit according to the reference comparison data and unit time;
collecting electromotive force information of a starting point and a finishing point of a distribution line, and carrying out security analysis on the distribution line;
checking starting and ending point electromotive force information of the cable voltage and the current at the position to be checked by using a corresponding characteristic matching algorithm, and judging problems including data jump and acquisition errors in the starting and ending point electromotive force information;
and checking the starting and ending point electromotive force information by using the set short, medium and long circuit models, judging that the starting and ending point electromotive force information is abrupt cable voltage and current when the information in the starting and ending point electromotive force information is matched with the set parameters in the short, medium and long circuit models, sending out a circuit fault signal, and transmitting the circuit fault signal to an intelligent diagnosis system engineer end for display.
The schematic diagram of the short, medium and long line model calculation unit according to a specific embodiment of the present application, as shown in the figure, includes:
the distribution line carries out security analysis unit: collecting electromotive force information of a starting point and a finishing point of the distribution line, and carrying out safety analysis on the distribution line;
a data processing unit: the unit checks the electromotive force information of the starting point and the ending point by using a corresponding characteristic matching algorithm, discovers the behavior of the original data, such as data jump, acquisition error and the like, and transmits the electromotive force information to the rule setting unit after preprocessing;
rule setting unit: the unit is a core unit of a short, medium and long circuit model; when the electromotive force information is sent from the preprocessor, the rule setting unit checks the electromotive force information by using the set rule, and the alarm output unit is notified once the information in the electromotive force information is found to be matched with a certain rule;
alarm output unit: the short, medium and long line model data checked by the rule setting unit need to be output in a certain mode, if a certain rule in the rule setting unit is matched, an alarm is sent, and the alarm information is transmitted to an engineer end of the intelligent diagnosis system for display through a protocol command.
In a specific embodiment, the short, medium and long line model specifically includes: and identifying the data size, the fluctuation condition, the fluctuation reason and the distribution line risk according to the set rule for the starting and ending electromotive force information of the cable voltage and the current at the position to be checked.
In a specific embodiment, according to the data size, the fluctuation condition, the fluctuation reason and the distribution line risk identification of the setting rule, the method specifically comprises the following steps:
(1) Firstly judging the influence factors of the cable voltage and the current at the position to be checked, which are monitored by the setting rule, comparing the monitored node information with a transmission curve diagram of the cable voltage and the current of the reference distribution line in unit time, identifying the risk of the distribution line, further increasing the percentage of the maximum value to be on line according to the maximum value set for the cable voltage and the current of the safety distribution line under the condition that the maximum value is exceeded, taking 3% as a setting basis, determining whether the cable voltage and the current at the position to be checked are misjudged, and directly entering the next step if the misjudgment is not performed;
(2) According to the alarm output unit, an alarm message is sent out, the alarm message is a yellow alarm message, the time is timed and aged according to the set time, the real-time remote processing time of the intelligent diagnosis system is given, if the intelligent diagnosis system processes the cable voltage and the current of the safety distribution line in real time, the transmission limiting threshold value of the electromotive force information of the position to be checked is extracted, the transmission limiting threshold value is recorded in the safety management platform of the distribution line, the transmission limiting threshold value is not reminded any more later, and if the intelligent diagnosis system processes no more after the time is timed, the next step is carried out;
(3) After the clustering model of the cable voltage and current with the change of the environmental temperature and the insulation resistance value of all abrupt lines is analyzed, the clustering model is compared with a transmission limiting threshold value stored in a fault source monitoring node management platform, under the condition that the transmission limiting threshold value is the same, an intelligent diagnosis system is directly fed back to perform self-adaptive line environmental temperature and insulation resistance value change response and line environmental temperature and insulation resistance value change processing scheme generation, when the corresponding transmission limiting threshold value does not exist in the fault source monitoring node management platform, the novel line environmental temperature and insulation resistance value change cable voltage and current are judged to be monitored, characteristic extraction is firstly performed according to the electromotive force information of a position to be inspected, the extracted transmission limiting threshold value is stored in the fault source monitoring node management platform, the self-adaptive line environmental temperature and insulation resistance value change response and the line environmental temperature and insulation resistance value change processing scheme generation are synchronously performed by the intelligent diagnosis system, and finally similar line environmental temperature and insulation resistance value change alarms are formed only according to the items analyzed by the clustering model, and the line environmental temperature and insulation resistance value change alarms are classified into the same category according to the transmission limiting threshold value.
Step T3: and judging whether the abrupt cable voltage and the abrupt cable current are misjudged by using the set short, medium and long circuit models, if so, eliminating the circuit fault signal and executing the step T4, and if not, executing the step T5.
In a specific embodiment, the step T3 specifically includes:
and judging the influence factors of the cable voltage and the current at the position to be checked, which are monitored by the setting rule, comparing the monitoring node information with the transmission curve graph of the cable voltage and the current of the reference distribution line in unit time, carrying out distribution line risk identification, and judging whether the abrupt change cable voltage and the current are misjudged according to the maximum value which is preset and is used for judging the cable voltage and the current of the safety distribution line.
Step T4: and constructing a distribution line safety management platform, judging whether the cable voltage and the current at the position to be checked belong to the safety distribution line cable voltage and the current by the intelligent diagnosis system background, if so, adding the cable voltage and the current at the position to be checked into the distribution line safety management platform, and if not, executing a step T5.
In a specific embodiment, the construction of the distribution line safety management platform is directly set according to the access of the background of the intelligent diagnosis system, and the cable voltage and current data of the distribution line safety management platform are calculated according to the change of the cable arrangement quantity.
In a specific embodiment, the step T4 specifically includes:
setting a data processing period, timing according to the period, and reminding an intelligent diagnosis system to process the voltage and the current of the cable at the position to be checked;
the intelligent diagnosis system carries out real-time remote processing on the cable voltage and the current of the position to be checked in the time range, and when the intelligent diagnosis system processes the cable voltage and the current of the position to be checked into the cable voltage and the current of the safety distribution line, the transmission limiting threshold value of the cable voltage and the current of the position to be checked is extracted and recorded in the safety management platform of the distribution line;
if a transmission limiting threshold value of the cable voltage and the current of the position to be checked, which are received subsequently, exists in the distribution line safety management platform, the intelligent diagnosis system is not reminded to process the cable voltage and the current of the position to be checked;
and if the intelligent diagnosis system does not process the cable voltage and the cable current at the position to be checked after the timing is finished, executing a step T5.
Step T5: and placing the abrupt change cable voltage and current into an intelligent diagnosis system for self-adapting line environment temperature and insulation resistance value change response and line environment temperature and insulation resistance value change processing scheme generation, extracting abnormal data of the abrupt change cable voltage and current, and constructing a fault source monitoring node management platform according to the abnormal data.
In a specific embodiment, the step T5 specifically includes:
performing cluster model analysis and classification on all abrupt cable voltages and currents to obtain if a plurality of cluster branches are involved, and comparing a transmission limiting threshold value of each cluster branch with a transmission limiting threshold value stored in the fault source monitoring node management platform;
if the same transmission limiting threshold value is compared, the corresponding abrupt cable voltage and current are directly fed back to the intelligent diagnosis system to carry out self-adaptive line environment temperature and insulation resistance value change response and line environment temperature and insulation resistance value change processing scheme generation;
if the same transmission limiting threshold value is not compared, judging that the corresponding abrupt cable voltage and current are the novel line environment temperature and insulation resistance value change cable voltage and current, performing feature extraction according to electromotive force information of the abrupt cable voltage and current, storing the extracted transmission limiting threshold value into the fault source monitoring node management platform, and performing self-adaptive line environment temperature and insulation resistance value change response and line environment temperature and insulation resistance value change processing scheme generation by the synchronous response intelligent diagnosis system;
and generating similar line environment temperature and insulation resistance value change alarms for the abrupt cable voltages and currents belonging to the same clustering branch, and dividing the abrupt cable voltages and currents belonging to the same clustering branch into the same type of cable voltage and current data according to the transmission limiting threshold.
As shown in fig. 2, a framework diagram of a cable fault intelligent diagnosis system according to an embodiment of the present application. The system comprises a cable voltage and current integrating unit for referencing distribution lines, a sudden change cable voltage and current identifying unit, a fault judging and supervising unit, a distribution line safety information identifying and monitoring unit and a fault source monitoring node management platform establishing unit.
In a specific embodiment, the reference distribution line cable voltage and current integration unit is configured to collect and integrate a transmission limiting threshold value of a set safety cable voltage and current in a distribution line according to ambient temperature and insulation resistance values when different cable cross-sectional areas in the distribution line, and perform curve plotting on the set safety cable voltage and current according to the integrated transmission limiting threshold value of the set safety cable voltage and current to obtain a transmission curve graph of the reference distribution line cable voltage and current in unit time;
the abrupt cable voltage and current identification unit is configured to use the transmission curve graph of the reference distribution line cable voltage and current in unit time as reference comparison data, monitor the change of the line environment temperature and the insulation resistance value of the received cable voltage and current at the position to be checked by using a set short, medium and long line model, judge whether the cable voltage and the current at the position to be checked are the abrupt cable voltage and current, and send out a line fault signal aiming at the abrupt cable voltage and the current;
the fault judging and supervising unit is configured to judge whether the abrupt cable voltage and current are misjudged by using the set short, medium and long circuit models, if so, the circuit fault signal is eliminated and the distribution circuit safety information identifying and monitoring unit is executed, and if not, the fault source monitoring node management platform building unit is executed;
the intelligent diagnosis system background judges whether the cable voltage and the current at the position to be checked belong to the safe distribution line cable voltage and the safe distribution line current, if so, the cable voltage and the safe distribution line current at the position to be checked are added into the safe distribution line management platform, and if not, the fault source monitoring node management platform building unit is executed;
the fault source monitoring node management platform building unit is configured to put the abrupt cable voltage and current into an intelligent diagnosis system for self-adapting line environment temperature and insulation resistance value change response and line environment temperature and insulation resistance value change processing scheme generation, extract abnormal data of the abrupt cable voltage and current, and build a fault source monitoring node management platform according to the abnormal data.
According to the system, according to the environmental temperature and insulation resistance values of different cable cross-section areas in a distribution line, a transmission limiting threshold value of set safety cable voltage and current in the distribution line is collected and integrated, and a transmission curve chart of the cable voltage and current of the reference distribution line in unit time is obtained; taking the transmission curve graph of the reference distribution line cable voltage and the current in unit time as reference comparison data, monitoring the change of the line environment temperature and the insulation resistance value of the received cable voltage and the current at the position to be checked by using a set short, medium and long line model, judging whether the cable voltage and the current at the position to be checked are abrupt cable voltage and current or not, and sending line fault signals aiming at the abrupt cable voltage and the abrupt cable current; the system monitors the cable voltage and the cable current of the distribution line, constructs a distribution line safety management platform and a fault source monitoring node management platform, recognizes the data size, the fluctuation condition, the fluctuation reason and the risk of the distribution line according to the set rule on the starting and ending electromotive force information of the cable voltage and the cable current at the position to be checked.
Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various equivalent changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the application, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. An intelligent diagnosis method for cable faults is characterized in that the system operation comprises the following steps:
step T1: acquiring and integrating transmission limiting thresholds of set safety cable voltage and current in a distribution line according to ambient temperature and insulation resistance values when different cable cross-sectional areas are formed in the distribution line, and carrying out curve depiction on the set safety cable voltage and current according to the transmission limiting thresholds of the set safety cable voltage and current obtained through integration to obtain a transmission curve graph of the cable voltage and current of the reference distribution line in unit time;
step T2: taking the transmission curve graph of the reference distribution line cable voltage and the current in unit time as reference comparison data, monitoring the change of the line environment temperature and the insulation resistance value of the received cable voltage and the current at the position to be checked by using a set short, medium and long line model, judging whether the cable voltage and the current at the position to be checked are abrupt cable voltage and current or not, and sending line fault signals aiming at the abrupt cable voltage and the abrupt cable current;
step T3: judging whether the abrupt change cable voltage and current are misjudged by using a set short, medium and long circuit model;
step T4: if yes, eliminating the line fault signal and constructing a distribution line safety management platform, judging whether the cable voltage and the current at the position to be checked belong to the safety distribution line cable voltage and the safety distribution line current by the intelligent diagnosis system background, and if yes, adding the cable voltage and the safety distribution line safety management platform;
step T5: if not, the abrupt change cable voltage and current are put into an intelligent diagnosis system for self-adapting line environment temperature and insulation resistance value change response and line environment temperature and insulation resistance value change processing scheme generation, abnormal data of the abrupt change cable voltage and current are extracted, and a fault source monitoring node management platform is constructed according to the abnormal data.
2. The intelligent diagnosis method for cable faults according to claim 1, wherein the transmission limiting threshold comprises: line starting and ending point loss value, fluctuation value of cable voltage and current unit time and reactive power value of line unit mileage.
3. The intelligent diagnosis method for cable faults according to claim 1, wherein the curve-describing the set safety cable voltage and the current according to the transmission limiting threshold value of the set safety cable voltage and the current obtained through integration to obtain a transmission curve chart of the cable voltage and the current of a reference distribution line per unit time specifically comprises the following steps:
constructing a periodic variation equation by utilizing the transmission limiting threshold value of the set safety cable voltage and the set safety cable current, carrying out variation calculation on the set safety cable voltage and the set safety cable current according to unit time, and storing the periodic variation equation as a transmission curve graph of the cable voltage and the set safety cable current in unit time of a reference distribution line;
and constructing the transmission curve graph of the cable voltage and the current of the reference distribution line in unit time and the periodic change equation into a standard cable voltage and current integration comparison table.
4. The intelligent diagnosis method for cable faults according to claim 1, wherein the construction of the distribution line safety management platform is directly set according to the access of a background of an intelligent diagnosis system, and cable voltage and current data of the distribution line safety management platform are calculated according to cable arrangement quantity change.
5. The intelligent diagnosis method for cable faults according to claim 1, wherein the step T2 specifically comprises:
constructing a short, medium and long circuit model calculation unit according to the reference comparison data and unit time;
collecting electromotive force information of a starting point and a finishing point of a distribution line, and carrying out security analysis on the distribution line;
checking starting and ending point electromotive force information of the cable voltage and the current at the position to be checked by using a corresponding characteristic matching algorithm, and judging problems including data jump and acquisition errors in the starting and ending point electromotive force information;
and checking the starting and ending point electromotive force information by using the set short, medium and long circuit models, judging that the starting and ending point electromotive force information is abrupt cable voltage and current when the information in the starting and ending point electromotive force information is matched with the set parameters in the short, medium and long circuit models, sending out a circuit fault signal, and transmitting the circuit fault signal to an intelligent diagnosis system engineer end for display.
6. The intelligent diagnosis method for cable faults according to claim 1, wherein the short, medium and long line models specifically comprise: and identifying the data size, the fluctuation condition, the fluctuation reason and the distribution line risk according to the set rule for the starting and ending electromotive force information of the cable voltage and the current at the position to be checked.
7. The intelligent diagnosis method for cable faults according to claim 6, wherein the step T3 specifically comprises:
and judging the influence factors of the cable voltage and the current at the position to be checked, which are monitored by the setting rule, comparing the monitoring node information with the transmission curve graph of the cable voltage and the current of the reference distribution line in unit time, carrying out distribution line risk identification, and judging whether the abrupt change cable voltage and the current are misjudged according to the maximum value which is preset and is used for judging the cable voltage and the current of the safety distribution line.
8. The intelligent diagnosis method for cable faults according to claim 6, wherein the step T4 specifically comprises:
setting a data processing period, timing according to the period, and reminding an intelligent diagnosis system to process the voltage and the current of the cable at the position to be checked;
the intelligent diagnosis system carries out real-time remote processing on the cable voltage and the current of the position to be checked in the time range, and when the intelligent diagnosis system processes the cable voltage and the current of the position to be checked into the cable voltage and the current of the safety distribution line, the transmission limiting threshold value of the cable voltage and the current of the position to be checked is extracted and recorded in the safety management platform of the distribution line;
if a transmission limiting threshold value of the cable voltage and the current of the position to be checked, which are received subsequently, exists in the distribution line safety management platform, the intelligent diagnosis system is not reminded to process the cable voltage and the current of the position to be checked;
and if the intelligent diagnosis system does not process the cable voltage and the cable current at the position to be checked after the timing is finished, executing a step T5.
9. The intelligent diagnosis method for cable faults according to claim 6, wherein the step T5 specifically comprises:
performing cluster model analysis and classification on all abrupt cable voltages and currents to obtain if a plurality of cluster branches are involved, and comparing a transmission limiting threshold value of each cluster branch with a transmission limiting threshold value stored in the fault source monitoring node management platform;
if the same transmission limiting threshold value is compared, the corresponding abrupt cable voltage and current are directly fed back to the intelligent diagnosis system to carry out self-adaptive line environment temperature and insulation resistance value change response and line environment temperature and insulation resistance value change processing scheme generation;
if the same transmission limiting threshold value is not compared, judging that the corresponding abrupt cable voltage and current are the novel line environment temperature and insulation resistance value change cable voltage and current, performing feature extraction according to electromotive force information of the abrupt cable voltage and current, storing the extracted transmission limiting threshold value into the fault source monitoring node management platform, and performing self-adaptive line environment temperature and insulation resistance value change response and line environment temperature and insulation resistance value change processing scheme generation by the synchronous response intelligent diagnosis system;
and generating similar line environment temperature and insulation resistance value change alarms for the abrupt cable voltages and currents belonging to the same clustering branch, and dividing the abrupt cable voltages and currents belonging to the same clustering branch into the same type of cable voltage and current data according to the transmission limiting threshold.
10. An intelligent diagnosis system for cable faults, which is characterized by comprising:
the power distribution line cable voltage and current integrating unit is used for acquiring and integrating transmission limiting thresholds of set safety cable voltage and current in the power distribution line according to ambient temperature and insulation resistance values when different cable cross-sectional areas are formed in the power distribution line, and carrying out curve description on the set safety cable voltage and current according to the transmission limiting thresholds of the set safety cable voltage and current obtained through integration to obtain a transmission curve chart of the cable voltage and current of the reference power distribution line;
the abrupt cable voltage and current identification unit is used for taking the transmission curve graph of the reference distribution line cable voltage and current in unit time as reference comparison data, monitoring the change of the line environment temperature and the insulation resistance value of the received cable voltage and current at the position to be checked by utilizing a set short, medium and long line model, judging whether the cable voltage and the current at the position to be checked are the abrupt cable voltage and current, and sending line fault signals aiming at the abrupt cable voltage and current;
the fault judging and supervising unit is used for judging whether the abrupt cable voltage and the abrupt cable current are misjudged by using the set short, medium and long circuit models, if so, eliminating the circuit fault signal and executing the distribution circuit safety information identifying and monitoring unit, and if not, executing the fault source monitoring node management platform building unit;
the intelligent diagnosis system background judges whether the cable voltage and the current at the position to be checked belong to the safe distribution line cable voltage and the safe distribution line current, if so, the cable voltage and the safe distribution line current at the position to be checked are added into the safe distribution line management platform, and if not, the fault source monitoring node management platform building unit is executed;
the fault source monitoring node management platform building unit is used for placing the abrupt cable voltage and current into an intelligent diagnosis system for self-adapting line environment temperature and insulation resistance value change response and line environment temperature and insulation resistance value change processing scheme generation, extracting abnormal data of the abrupt cable voltage and current, and building the fault source monitoring node management platform according to the abnormal data.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117368675A (en) * | 2023-12-05 | 2024-01-09 | 广东环威电线电缆股份有限公司 | Cable insulation performance testing method and related device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117368675A (en) * | 2023-12-05 | 2024-01-09 | 广东环威电线电缆股份有限公司 | Cable insulation performance testing method and related device |
| CN117368675B (en) * | 2023-12-05 | 2024-03-19 | 广东环威电线电缆股份有限公司 | Cable insulation performance testing method and related device |
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