CN115267600B - Split contact type cable leakage current monitor and monitoring method - Google Patents
Split contact type cable leakage current monitor and monitoring method Download PDFInfo
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- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
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Abstract
The invention relates to a split contact type cable leakage current monitor and a monitoring method, and belongs to the technical field of measuring electric variables. The invention comprises a monitor for monitoring the leakage current of a cable, wherein a sensor group is arranged in the monitor, the monitor comprises a handheld part fixed on the cable side and a main body part arranged with the handheld part body, the handheld part is used for monitoring the cable device in real time, and the main body part is spliced for analyzing and sorting monitoring data; the split type design is divided into the handheld part and the main body part, so that the requirements of more occasions can be met, the split type portable electronic device can be nested as one piece of integral equipment for use, and the split type portable electronic device can be disassembled for use, and is flexible and convenient to use; according to the invention, the leakage grade is assigned according to the leakage case statistics condition of the cable; and then, the texture change rate is obtained by utilizing the proposed leakage grade evolution algorithm, so that the method is more in line with the recognition requirement of cable leakage monitoring, and the monitoring effect is higher. The invention can be widely applied to occasions for measuring electric variables.
Description
Technical Field
The invention relates to a split contact type cable leakage current monitor and a monitoring method, and belongs to the technical field of measuring electric variables.
Background
In the prior art, cable current monitoring is essentially equipped with a handheld monitor, which is only of reference significance at the time, and the time-lapse data is of no value. There are also online monitors that monitor the trend of the leakage current of the cable on line for 24 hours a day, but if the leakage position is too many, many monitors may need to be equipped, and the whole set of cost is still higher.
In fact, in the prior art, when a plurality of on-line monitors are provided in the same area, many functions are repeated, such as current monitoring, and each device must be provided with a current acquisition circuit with a small coil; in addition, leakage current monitoring is generally voltage or current signals, and complex sensor monitoring and wireless data transmission are not needed in practice, and the existing individual design is obviously repeated and redundant when a large whole system is formed. The single use needs to be self-contained in function, and the hardware cost is relatively high when the system is combined for use.
Disclosure of Invention
Aiming at the leakage existing in the prior art, the invention provides a split type contact type cable leakage current monitor and a monitoring method, which can be assembled into a set for use, can be used for split type multipoint distribution monitoring, and can be used for centralized data processing or all data transmission to an analyzer for analysis and online calibration.
The invention relates to a split type contact type cable leakage current monitor, which comprises a monitor for monitoring cable leakage current, wherein a sensor group is arranged in the monitor, the monitor comprises a handheld part fixed on a cable side and a main body part arranged with the handheld part, the handheld part is used for monitoring a cable device in real time, and the main body part is spliced for monitoring data analysis and arrangement, wherein:
the handheld part is arranged in a strip shape, one end of the handheld part is provided with a monitoring port sleeved with a cable, and a matched monitoring component is arranged below the monitoring port; the middle part of the hand-held part is provided with a plug-in port I matched with the main body part; the monitoring component is contacted with the plug interface I through a data line;
a body portion including a housing with a display, and a control assembly mated through a telescoping assembly, wherein:
the telescopic assembly comprises a telescopic rod, a sliding rail and a tray, a control assembly is arranged on the tray, and the side part of the tray is connected to the shell through the sliding rail and moves back and forth relative to the shell; the front end of the tray is provided with a telescopic rod, the tail end of the telescopic rod is provided with a plugboard, the plugboard is in butt joint with the handheld part, and a plugboard II on the plugboard is matched with a plugboard I of the handheld part;
the control assembly comprises a controller, a sensor group and a wireless module, wherein the controller receives monitoring information of the plug-in interface II, combines the information monitored by the sensor group and transmits the information to the analyzer through the wireless module.
Preferably, the monitoring assembly comprises a monitoring coil and a housing protecting the monitoring coil, wherein:
under the action of alternating current, the monitoring coil can generate an alternating magnetic field around the monitoring coil, the alternating magnetic field acts on the electrified cable in real time, the continuous scanning is carried out, and whether the cable is abnormal or not is monitored in real time.
Preferably, the plugboard is positioned in the main body part when contracted, and the plugboard at the end part of the plugboard is butted to the handheld part when extended, so that the data is ensured to be connected through the plug-in interface I and the plug-in interface II; the inner wall of interface I is connected with the surface contact of interface II, and the width size of interface II is greater than the biggest external diameter of interface I.
Preferably, the front end of the hand-held part is bent downwards and is further bent backwards to horizontally extend to form a monitoring head, and a monitoring port which vertically penetrates through a semicircle is reserved on the monitoring head; the inner cavity of the hand-held part is provided with a plurality of reinforcing ribs.
Preferably, the monitoring component is provided with a through hole connected with the plug-in interface I; the monitoring assembly housing includes four side walls and a bottom, the side walls and the bottom forming a cavity adapted to receive the monitoring coil.
Preferably, the monitor is connected with the analyzer through a wireless module, and the analyzer adopts a B/S architecture, and comprises an information correction unit, a historical data storage unit, an information prediction unit and a leakage level management unit, wherein:
the information correction unit is used for receiving information acquired by the perception monitor, and accurately giving an early warning instruction through identifying the magnitude of leakage current in the information, so that the perception monitor is ensured to accurately acquire the information of the leakage current;
the historical data storage unit is used for deleting the information of which the leakage current is not in accordance with the requirement, reserving and collecting the information in accordance with the requirement, and forming a collection set, so that the follow-up prediction and management are facilitated;
the information prediction unit is used for calling the historical data storage unit, predicting the change rate of the leakage current in the information, and predicting the time for future leakage level of the leakage current by combining the time evolution;
and the leakage level management unit is used for recording all leakage levels of each leakage current, forming corresponding characteristics and recording the corresponding characteristics on the original picture, so that the learning of the visual neural network is facilitated.
The monitor has the beneficial effects that: the split type design is divided into the handheld part and the main body part, so that the requirements of more occasions can be met, the split type portable electronic device can be nested as one piece of integral equipment for use, and the split type portable electronic device can be disassembled for use, and is flexible and convenient to use; when the device is independently used, one tractor can realize that one main body part is matched with a plurality of handheld parts, wherein the handheld parts are distributed in the same measuring area, are arranged in multiple points and are concentrated in one analyzer for summarizing operation, so that the overall cost input of the monitor can be reduced; the direct plug-in interface can be plugged in, so that the monitoring equipment with complete functions can be assembled, and the adaptability is high; corresponding operation processing can be uniformly performed on the analyzer, and each main body part is not required to be provided with an analysis module; and the voltage of the same area is more suitable for one-to-many scenes, so that the low-cost monitoring arrangement is performed, and the economy is good.
The invention relates to a monitoring method of a split contact type cable leakage current monitor, which comprises the following steps:
s1: and (3) correction acquisition of a monitor: after the monitor collects information, the leakage current is corrected by the analyzer, and the corrected monitoring coil; the monitoring coil correction signal generation circuit corrects the characteristics of the acquisition channel at different frequencies and gains, and the monitoring coil acquires small coil output signals tightly coupled with the cable and provides phase references for receiving so as to assist the normal operation of monitoring parameters;
s2: preprocessing the acquired information: the leakage current in the corrected information is kept uniform, so that the leakage current can be conveniently compared with historical data; firstly, carrying out Fourier transform to obtain leakage current; determining a frequency band interval according to the sampling frequency and the sampling time of the leakage current information, and carrying out frequency band division on the leakage current frequency domain current according to the frequency band interval; extracting leakage current time domain characteristic quantity of the frequency band signal, and extracting leakage current frequency domain characteristic quantity of the pre-information;
s3: quantitative analysis of historical information data: the information change of the same cable in different historical periods is utilized to obtain the leakage current change rate, and the accuracy of which leakage grade the cable belongs to in the information is predicted, namely:
the information collected by the analyzer is recorded with historical data of different leakage grades, the current evolution of a certain leakage grade into the current of the next leakage grade is determined in the preprocessed information, and after the current conforming to the leakage grade is captured, the evolution time of the reference information is overlapped, so that the leakage current change rate is obtained;
s4, determining a leakage level set: the analyzer performs segmentation processing on the quantitatively analyzed information, so as to identify one or more cables in the information, and sets one or more leakage levels for one or more leakage currents on the information; forming one or more leakage levels into a set for training a neural network that evaluates the information leakage levels; and forming one or more features of the leakage level based on the neural network and noting the features on the relevant information.
Preferably, in the step S3, the historical information data is quantitatively analyzed, the leakage grade is classified, and the calculation of weighted average assignment is performed respectively; meanwhile, the leakage grade is assigned according to the leakage case statistics condition of the cable, and the calculation of the leakage grade of a certain cable is realized according to the following formula:
wherein: roC Total (S) For the total leakage class value of the entire cable,for the summation of the aged leakage level values,for the summation of the poor contact leakage class values, +.>For the summation of the fracture leakage class values,summing leakage class values for failure cases;
alpha is an ageing leakage factor determination value, beta is a poor contact leakage factor determination value, and gamma is a breaking leakage factor determination value;
n is the number of factors in the single cable leakage composite factor classification.
The method has the beneficial effects that: the invention utilizes Fourier transformation to divide the frequency band of the leakage current frequency domain current; then extracting leakage current time domain characteristic quantity of the frequency band signal, and extracting leakage current frequency domain characteristic quantity of the pre-information; then, assigning a leakage grade according to the leakage case statistics condition of the cable; then, the texture change rate is obtained by utilizing the proposed leakage level evolution algorithm; finally, obtaining a collection formed by one or more leakage levels by utilizing the historical image data, and finally, taking the collection as a training model of the neural network; the whole method is different from the existing training mode, more accords with the identification requirement of cable leakage monitoring, and has higher monitoring effect.
Drawings
FIG. 1 is a schematic diagram of the structure of the monitor of the present invention.
Fig. 2 is a schematic structural view of the hand-held portion.
Fig. 3 is a schematic structural view of the monitoring assembly.
Fig. 4 is a schematic structural view of the main body.
Fig. 5 is an electrical connection diagram of a monitor and an analyzer.
Fig. 6 is a block diagram of the connection of a monitor to an analyzer.
Fig. 7 is an electrical connection diagram of the monitor.
Fig. 8 is a flow schematic of the method of the present invention.
In the figure: 1. a hand-held part; 2. an interface I; 3. monitoring the mouth; 4. a monitoring component; 41. monitoring a coil; 42. a housing; 5. a main body portion; 6. a telescopic rod; 7. a display; 8. a control assembly; 9. a slide rail; 10. a plug board; 11. an interface II; 12. an analyzer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Example 1:
as shown in fig. 1, the split contact type cable leakage current monitor according to the present invention includes a monitor for monitoring cable leakage current, a sensor group is built in the monitor, the monitor includes a hand-held portion 1 fixed on a cable side, and a main body portion 5 separately arranged with the hand-held portion 1, the hand-held portion 1 is used for monitoring the cable device in real time, and the main body portion 5 is inserted for analyzing and sorting monitoring data, wherein:
as shown in fig. 2, the handheld part 1 is arranged in a strip shape, one end of the handheld part is provided with a monitoring port 3 sleeved with a cable, and a matched monitoring component 4 is arranged below the monitoring port 3; the middle part of the hand-held part 1 is provided with a plug-in port I2 matched with the main body part 5; the monitoring component 4 is contacted with the plug interface I2 through a data line.
As shown in fig. 3, the monitoring assembly 4 includes a monitoring coil 41 and a housing 42 protecting the monitoring coil 41, wherein:
the monitoring coil 41 generates an alternating magnetic field around the monitoring coil under the action of alternating current, and the alternating magnetic field acts on the electrified cable in real time to scan continuously, so as to monitor whether the cable is abnormal in real time.
As shown in fig. 4, the main body part 5 comprises a housing with a display 7, and a control assembly 8 engaged by a telescopic assembly, wherein:
the telescopic assembly comprises a telescopic rod 6, a sliding rail 9 and a tray, wherein the tray is provided with a control assembly 8, and the side part of the tray is connected to the shell through the sliding rail 9 and moves back and forth relative to the shell; the front end of the tray is provided with a telescopic rod 6, the tail end of the telescopic rod 6 is provided with a plugboard 10, the plugboard 10 is in butt joint with the handheld part 1, and a plugboard II 11 on the plugboard 10 is matched with a plugboard I2 of the handheld part 1;
the control assembly 8 comprises a controller, a sensor group and a wireless module, wherein the controller receives the monitoring information of the plug-in interface II 11 and transmits the information to the analyzer 12 through the wireless module by combining the information monitored by the sensor group, as shown in fig. 5 and 6.
Preferably, the plug board 10 is positioned in the main body 5 when contracted, and the plug board 10 at the end part of the plug board 10 is butted to the hand-held part 1 when extended, and the data is ensured to be connected through the plug interface I2 and the plug interface II 11; the inner wall of interface I2 is connected with the surface contact of interface II 11, and the width size of interface II 11 is greater than the biggest external diameter of interface I2.
Preferably, the front end of the hand-held part 1 is bent downwards and is further bent backwards to horizontally extend to be provided with a monitoring head, and a monitoring port 3 which vertically penetrates through a semicircle is reserved on the monitoring head; the inner cavity of the hand-held part 1 is provided with a plurality of reinforcing ribs.
Preferably, the monitoring component 4 is provided with a through hole connected with the plug-in interface I2; the housing 42 of the monitoring assembly 4 comprises four side walls and a bottom, the side walls and the bottom forming a cavity suitable for the placement of the monitoring coil 41.
As shown in fig. 7, the monitor is connected to the analyzer 12 through a wireless module, and the analyzer 12 adopts a B/S architecture, including an information correction unit, a history data storage unit, an information prediction unit, and a leakage level management unit, wherein:
the information correction unit is used for receiving information acquired by the perception monitor, and accurately giving an early warning instruction through identifying the magnitude of leakage current in the information, so that the perception monitor is ensured to accurately acquire the information of the leakage current;
the historical data storage unit is used for deleting the information of which the leakage current is not in accordance with the requirement, reserving and collecting the information in accordance with the requirement, and forming a collection set, so that the follow-up prediction and management are facilitated;
the information prediction unit is used for calling the historical data storage unit, predicting the change rate of the leakage current in the information, and predicting the time for future leakage level of the leakage current by combining the time evolution;
and the leakage level management unit is used for recording all leakage levels of each leakage current, forming corresponding characteristics and recording the corresponding characteristics on the original picture, so that the learning of the visual neural network is facilitated.
The monitor is divided into the handheld part 1 and the main body part 5 through a split design, so that the monitor can meet the requirements of more occasions, can be nested as one whole device for use, can be disassembled for use, and is flexible and convenient to use; when the device is independently used, one-to-many operation can be realized, namely, one main body part 5 is matched with a plurality of hand-held parts 1, wherein the hand-held parts 1 are distributed in the same measuring area, are arranged in multiple points and are concentrated in one analyzer 12 for summarizing operation, so that the overall cost investment of the monitor can be reduced; the direct plug-in interface can be plugged in, so that the monitoring equipment with complete functions can be assembled, and the adaptability is high; the corresponding operation processing can be uniformly performed on the analyzer 12, and each main body part 5 is not required to be provided with an analysis module; and the voltage of the same area is more suitable for one-to-many scenes, so that the low-cost monitoring arrangement is performed, and the economy is good.
Example 2:
as shown in fig. 8, the monitoring method of the split contact type cable leakage current monitor according to the invention comprises the following steps:
s1: and (3) correction acquisition of a monitor: the monitoring instrument collects information and corrects the leakage current through the analyzer 12, and the corrected monitoring coil 41; the correction signal generating circuit of the monitoring coil 41 corrects the characteristics of the acquisition channel at different frequencies and gains, and the monitoring coil 41 acquires small coil output signals tightly coupled with the cable and provides phase references for receiving so as to assist the normal operation of monitoring parameters;
s2: preprocessing the acquired information: the leakage current in the corrected information is kept uniform, so that the leakage current can be conveniently compared with historical data; firstly, carrying out Fourier transform to obtain leakage current; determining a frequency band interval according to the sampling frequency and the sampling time of the leakage current information, and carrying out frequency band division on the leakage current frequency domain current according to the frequency band interval; extracting leakage current time domain characteristic quantity of the frequency band signal, and extracting leakage current frequency domain characteristic quantity of the pre-information;
s3: quantitative analysis of historical information data: the information change of the same cable in different historical periods is utilized to obtain the leakage current change rate, and the accuracy of which leakage grade the cable belongs to in the information is predicted, namely:
the information collected by the analyzer 12 is recorded with historical data of different leakage grades, the current evolution of a certain leakage grade into the current of the next leakage grade is determined in the preprocessed information, and after the current conforming to the leakage grade is captured, the evolution time of the reference information is overlapped, so that the leakage current change rate is obtained;
s4, determining a leakage level set: the analyzer 12 performs a segmentation process on the quantitatively analyzed information to identify one or more cables in the information, and sets one or more leakage levels for one or more leakage currents on the information; forming one or more leakage levels into a set for training a neural network that evaluates the information leakage levels; and forming one or more features of the leakage level based on the neural network and noting the features on the relevant information.
Preferably, in the step S3, the historical information data is quantitatively analyzed, the leakage grade is classified, and the calculation of weighted average assignment is performed respectively; meanwhile, the leakage grade is assigned according to the leakage case statistics condition of the cable, and the calculation of the leakage grade of a certain cable is realized according to the following formula:
wherein: roC Total (S) For the total leakage class value of the entire cable,for the summation of the aged leakage level values,for the summation of the poor contact leakage class values, +.>For the summation of the fracture leakage class values,summing leakage class values for failure cases;
alpha is an ageing leakage factor determination value, beta is a poor contact leakage factor determination value, and gamma is a breaking leakage factor determination value;
n is the number of factors in the single cable leakage composite factor classification.
The invention utilizes Fourier transformation to divide the frequency band of the leakage current frequency domain current; then extracting leakage current time domain characteristic quantity of the frequency band signal, and extracting leakage current frequency domain characteristic quantity of the pre-information; then, assigning a leakage grade according to the leakage case statistics condition of the cable; then, the texture change rate is obtained by utilizing the proposed leakage level evolution algorithm; finally, obtaining a collection formed by one or more leakage levels by utilizing the historical image data, and finally, taking the collection as a training model of the neural network; the whole method is different from the existing training mode, more accords with the identification requirement of cable leakage monitoring, and has higher monitoring effect.
The invention can be widely applied to occasions for measuring electric variables.
Claims (7)
1. The utility model provides a split type contact type cable leakage current monitor, including the monitor that is used for monitoring cable leakage current, the monitor embeds there is the sensor group, its characterized in that, the monitor including fix handheld portion (1) in the cable side to and with main part (5) that handheld portion (1) components of a whole that can function independently set up, handheld portion (1) are used for real-time supervision cable device, peg graft main part (5) and monitor data analysis arrangement, wherein:
the handheld part (1) is arranged in a strip shape, one end of the handheld part is provided with a monitoring port (3) sleeved with a cable, and a matched monitoring assembly (4) is arranged below the monitoring port (3); the middle part of the hand-held part (1) is provided with a plug-in port I (2) matched with the main body part (5); the monitoring component (4) is contacted with the plug interface I (2) through a data line;
a body part (5) comprising a housing with a display (7), and a control assembly (8) cooperating by means of a telescopic assembly, wherein:
the telescopic assembly comprises a telescopic rod (6), a sliding rail (9) and a tray, a control assembly (8) is arranged on the tray, and the side part of the tray is connected to the shell through the sliding rail (9) and moves back and forth relative to the shell; the front end of the tray is provided with a telescopic rod (6), the tail end of the telescopic rod (6) is provided with a plugboard (10), the plugboard (10) is in butt joint with the handheld part (1), and a plugboard II (11) on the plugboard (10) is matched with a plugboard I (2) of the handheld part (1);
the control assembly (8) comprises a controller, a sensor group and a wireless module, wherein the controller receives monitoring information of the plug-in interface II (11) and combines the information monitored by the sensor group to transmit the information to the analyzer (12) through the wireless module;
the front end of the hand-held part (1) is bent downwards and is continuously bent backwards to horizontally extend to form a monitoring head, and a monitoring port (3) which vertically penetrates through a semicircle is reserved on the monitoring head; the inner cavity of the hand-held part (1) is provided with a plurality of reinforcing ribs.
2. The split contact type cable leakage current monitor as defined in claim 1, wherein the monitoring assembly (4) comprises a monitoring coil (41) and a housing (42) protecting the monitoring coil (41), wherein:
the monitoring coil (41) can generate an alternating magnetic field around the monitoring coil under the action of alternating current, the alternating magnetic field acts on the electrified cable in real time, the cable is continuously scanned, and whether the cable is abnormal or not is monitored in real time.
3. The split contact type cable leakage current monitor according to claim 1, wherein the plug board (10) is located in the main body part (5) when contracted, the plug board (10) at the end part of the plug board is butted to the hand-held part (1) when extended, and the connection of data is ensured through the plug interface i (2) and the plug interface ii (11); the inner wall of the plug interface I (2) is in contact connection with the surface of the plug interface II (11), and the width dimension of the plug interface II (11) is larger than the maximum outer diameter of the plug interface I (2).
4. The split contact type cable leakage current monitor as claimed in claim 1 or 2, wherein the monitoring assembly (4) is provided with a through hole for connecting the plug-in interface i (2); the housing (42) of the monitoring assembly (4) comprises four side walls and a bottom, the side walls and the bottom forming a cavity suitable for the placement of the monitoring coil (41).
5. The split contact type cable leakage current monitor according to claim 1, wherein the monitor is connected to an analyzer (12) through a wireless module, and the analyzer (12) adopts a B/S architecture, and comprises an information correction unit, a history data storage unit, an information prediction unit, and a leakage level management unit, wherein:
the information correction unit is used for receiving information acquired by the perception monitor, and accurately giving an early warning instruction through identifying the magnitude of leakage current in the information, so that the perception monitor is ensured to accurately acquire the information of the leakage current;
the historical data storage unit is used for deleting the information of which the leakage current is not in accordance with the requirement, reserving and collecting the information in accordance with the requirement, and forming a collection set, so that the follow-up prediction and management are facilitated;
the information prediction unit is used for calling the historical data storage unit, predicting the change rate of the leakage current in the information, and predicting the time for future leakage level of the leakage current by combining the time evolution;
and the leakage level management unit is used for recording all leakage levels of each leakage current, forming corresponding characteristics and recording the corresponding characteristics on the original picture, so that the learning of the visual neural network is facilitated.
6. A method of monitoring a split contact cable leakage current monitor as claimed in any one of claims 1 to 5, comprising the steps of:
s1: and (3) correction acquisition of a monitor: after the monitor collects information, the leakage current is corrected through the analyzer (12), the analyzer (12) corrects the collected different frequencies and gain characteristics, and the monitoring coil (41) collects small coil output signals tightly coupled with the cable and provides phase references for receiving so as to assist the normal operation of monitoring parameters;
s2: preprocessing the acquired information: the leakage current in the corrected information is kept uniform, so that the leakage current can be conveniently compared with historical data; firstly, carrying out Fourier transform to obtain leakage current; determining a frequency band interval according to the sampling frequency and the sampling time of the leakage current information, and carrying out frequency band division on the leakage current frequency domain current according to the frequency band interval; extracting leakage current time domain characteristic quantity of the frequency band signal;
s3: quantitative analysis of historical information data: the information change of the same cable in different historical periods is utilized to obtain the leakage current change rate, and the accuracy of the cable leakage grade in the predicted information is:
the information collected by the analyzer (12) is recorded with historical data of different leakage grades, the current evolution of a certain leakage grade into the current of the next leakage grade is determined in the preprocessed information, and after the current conforming to the leakage grade is captured, the evolution time of the reference information is overlapped, so that the leakage current change rate is obtained;
s4, determining a leakage level set: the analyzer (12) performs segmentation processing on the quantitatively analyzed information, so as to identify one or more cables in the information, and sets one or more leakage levels for one or more leakage currents on the information; forming one or more leakage levels into a set for training a neural network that evaluates the information leakage levels; and forming one or more features of the leakage level based on the neural network and noting the features on the relevant information.
7. The split contact type cable leakage current monitor and monitoring method according to claim 6, wherein the step S3 is characterized in that the historical information data is quantitatively analyzed, the leakage grades are classified, and the calculation of weighted average assignment is performed respectively; meanwhile, the leakage grade is assigned according to the leakage case statistics condition of the cable, and the calculation of the leakage grade of a certain cable is realized according to the following formula:
wherein: roC Total (S) For the total leakage class value of the entire cable,for the summation of the aged leakage level values,for the summation of the poor contact leakage class values, +.>For the summation of the fracture leakage class values,summing leakage class values for failure cases;
alpha is an ageing leakage factor determination value, beta is a poor contact leakage factor determination value, and gamma is a breaking leakage factor determination value;
n is the number of factors in the single cable leakage composite factor classification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210889114.0A CN115267600B (en) | 2022-07-27 | 2022-07-27 | Split contact type cable leakage current monitor and monitoring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210889114.0A CN115267600B (en) | 2022-07-27 | 2022-07-27 | Split contact type cable leakage current monitor and monitoring method |
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