CN116859284A - Multi-point grounding on-line monitoring device, method and equipment for cable metal sheath - Google Patents
Multi-point grounding on-line monitoring device, method and equipment for cable metal sheath Download PDFInfo
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Abstract
The application discloses a multipoint grounding on-line monitoring device, method and equipment for a cable metal sheath, and belongs to the technical field of electric power facilities. The device comprises: the grounding current acquisition module is used for acquiring grounding current data; the data transmission module is used for transmitting the collected grounding current data to the monitoring terminal; the grounding current analysis module is used for determining whether the grounding current data are matched with a predetermined multipoint grounding current abnormality; if the two types of the metal sheaths are matched, determining that the metal sheath of the cable has multipoint grounding abnormality; and the maintenance alarm module is used for generating alarm information of the multipoint grounding abnormality. According to the technical scheme, the cable metal sheath can be monitored on line, the problem of multipoint earthing of the cable metal sheath can be found in time, maintenance warning is given rapidly, and the instantaneity and the efficiency of cable metal sheath maintenance are greatly improved.
Description
Technical Field
The application belongs to the technical field of electric power facilities, and particularly relates to a multipoint grounding on-line monitoring device, method and equipment for a cable metal sheath.
Background
In recent years, the use rate of the power cable is higher and higher, and the operation safety of the cable is related to whether the power supply of a power system is reliable or not.
However, because the laying environment is complex, the outer insulating layer of the cable metal sheath is often damaged by water erosion, chemical substance damage, termite erosion and the like, so that the cable metal sheath has the problem of multi-point grounding, and the current-carrying capacity of the cable is reduced, the heat loss is increased, and even the personal equipment safety is endangered.
At present, the multi-point grounding monitoring of the cable metal sheath mostly depends on periodic inspection by workers, or insulation experiments are carried out on the cable insulation layer according to preventive test rules to judge the service life of the cable. However, these methods cannot obtain real-time information, and may delay the rush repair time when a sudden accident occurs. Therefore, how to monitor the multipoint grounding condition of the cable metal sheath on line is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The embodiment of the application aims to provide a multipoint grounding on-line monitoring device, a multipoint grounding on-line monitoring method and multipoint grounding on-line monitoring equipment for a cable metal sheath, which can be used for monitoring the cable metal sheath on line, finding the multipoint grounding problem of the cable metal sheath in time and rapidly giving a maintenance alarm, thereby greatly improving the real-time performance and the efficiency of the maintenance of the cable metal sheath.
In a first aspect, an embodiment of the present application provides a multipoint earthing on-line monitoring device for a cable metal sheath, where the device includes:
the grounding current acquisition module is used for acquiring grounding current data;
the data transmission module is used for transmitting the collected grounding current data to the monitoring terminal;
the grounding current analysis module is used for determining whether the grounding current data are matched with a predetermined multipoint grounding current abnormality; if the two types of the metal sheaths are matched, determining that the metal sheath of the cable has multipoint grounding abnormality;
and the maintenance alarm module is used for generating alarm information of the multipoint grounding abnormality.
Further, the ground current analysis module is further configured to:
and under the condition that the rise amplitude of the grounding current data exceeds the preset fluctuation range of the average value of the historical grounding current data, starting a matching algorithm to match the grounding current data with the predetermined multipoint grounding current abnormality.
Further, the ground current analysis module is further configured to:
acquiring a multipoint grounding current abnormal curve, and drawing an actually measured grounding current curve based on the grounding current data;
and calculating the distance parameter and the shape parameter of the multipoint grounding current abnormal curve and the actually measured grounding current curve to reach preset conditions, and determining that the multipoint grounding abnormality exists in the metal sheath of the cable.
Further, the ground current analysis module is further configured to:
obtaining the difference characteristic of the actually measured grounding current curve relative to the multipoint grounding current abnormal curve;
if the first difference characteristic exists, determining that the occurrence of the multipoint earthing current abnormality of the cable is caused by the corrosion and water seepage abnormality of the insulating layer of the cable;
and if the second difference characteristic exists, determining that the occurrence of the cable multipoint grounding current abnormality is caused by the hard object wound abnormality of the insulating layer of the cable.
Further, the apparatus further comprises a gas detection module, the apparatus further comprising:
the temperature detection module is used for acquiring temperature data of the cable metal sheath;
correspondingly, the grounding current analysis module is further used for:
determining whether the ground current data matches a predetermined multipoint ground current anomaly if the temperature data meets a preset temperature increase condition; if the two types of the metal sheaths are matched, determining that the metal sheaths of the cables have multipoint grounding abnormality.
Further, the ground current analysis module is further configured to:
recording the abnormal times of the occurrence of the multipoint grounding abnormality;
and determining and constructing a cable service life determining model in advance according to the abnormal times, and determining the safety service life of the cable.
In a second aspect, an embodiment of the present application provides a method for online monitoring multipoint grounding of a cable metal sheath, where the method includes:
acquiring grounding current data through a grounding current acquisition module;
transmitting the collected grounding current data to a monitoring terminal through a data transmission module;
determining, by a ground current analysis module, whether the ground current data matches a predetermined multipoint ground current anomaly; if the two types of the metal sheaths are matched, determining that the metal sheath of the cable has multipoint grounding abnormality;
and generating alarm information of the multipoint grounding abnormality through a maintenance alarm module.
Further, the method for determining whether the ground current data matches a predetermined multipoint ground current anomaly by the ground current analysis module specifically includes:
and under the condition that the rise amplitude of the grounding current data exceeds the preset fluctuation range of the average value of the historical grounding current data, starting a matching algorithm to match the grounding current data with the predetermined multipoint grounding current abnormality.
Further, determining, by a ground current analysis module, whether the ground current data matches a predetermined multipoint ground current anomaly; if so, determining that the metal sheath of the cable has multipoint grounding abnormality, including:
Acquiring a multipoint grounding current abnormal curve, and drawing an actually measured grounding current curve based on the grounding current data;
and calculating the distance parameter and the shape parameter of the multipoint grounding current abnormal curve and the actually measured grounding current curve to reach preset conditions, and determining that the multipoint grounding abnormality exists in the metal sheath of the cable.
In a third aspect, an embodiment of the present application provides an electronic device, including a processor, a memory, and a program or instruction stored on the memory and executable on the processor, the program or instruction implementing the steps of the method according to the first aspect when executed by the processor.
In a fourth aspect, embodiments of the present application provide a readable storage medium having stored thereon a program or instructions which when executed by a processor perform the steps of the method according to the first aspect.
In a fifth aspect, an embodiment of the present application provides a chip, where the chip includes a processor and a communication interface, where the communication interface is coupled to the processor, and where the processor is configured to execute a program or instructions to implement a method according to the first aspect.
In the embodiment of the application, a worker inputs the possible multipoint grounding current abnormal situation and corresponding grounding current data to the monitoring terminal in advance. And in the process of cable operation, the grounding current acquisition module acquires grounding current data and sends the grounding current data to the monitoring terminal through the data transmission module, and then the grounding current analysis module matches the grounding current data with a preset multipoint grounding current abnormal condition, so that whether the multipoint grounding current abnormality exists in the cable metal sheath or not is determined. And then the maintenance warning module carries out fault warning on terminal equipment of the staff, and informs the staff that the multipoint grounding abnormality exists in the cable metal sheath and prompts the occurrence reason. Through the multipoint earthing on-line monitoring device of the cable metal sheath, the cable metal sheath can be monitored on line, the multipoint earthing problem of the cable metal sheath can be found in time, maintenance warning can be given rapidly, and the real-time performance and the efficiency of the maintenance of the cable metal sheath are greatly improved.
Drawings
Fig. 1 is a schematic structural diagram of a multipoint earthing on-line monitoring device for a cable metal sheath according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a multipoint earthing on-line monitoring device for a cable metal sheath according to a second embodiment of the present application;
fig. 3 is a schematic structural diagram of a multipoint earthing on-line monitoring device for a cable metal sheath according to a third embodiment of the present application;
fig. 4 is a schematic structural diagram of a multipoint earthing on-line monitoring device for a cable metal sheath according to a fourth embodiment of the present application;
fig. 5 is a schematic structural diagram of a multipoint earthing on-line monitoring device for a cable metal sheath according to a fifth embodiment of the present application;
fig. 6 is a schematic structural diagram of a multipoint earthing on-line monitoring device for a cable metal sheath according to a sixth embodiment of the present application;
fig. 7 is a flow chart of a multipoint earthing on-line monitoring method for a cable metal sheath according to a seventh embodiment of the application;
fig. 8 is a schematic structural diagram of an electronic device according to an eighth embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the following detailed description of specific embodiments of the present application is given with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the matters related to the present application are shown in the accompanying drawings. Before discussing exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart depicts operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently, or at the same time. Furthermore, the order of the operations may be rearranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figures. The processes may correspond to methods, functions, procedures, subroutines, and the like.
The technical solutions of the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which are obtained by a person skilled in the art based on the embodiments of the present application, fall within the scope of protection of the present application.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type, and are not limited to the number of objects, such as the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
The device, the method and the equipment for the multipoint earthing on-line monitoring of the cable metal sheath provided by the embodiment of the application are described in detail through specific embodiments and application scenes thereof by combining the attached drawings.
Example 1
Fig. 1 is a schematic structural diagram of a multipoint earthing on-line monitoring device for a cable metal sheath according to an embodiment of the present application. As shown in fig. 1, the method specifically comprises the following steps:
the ground current acquisition module 110 is configured to acquire ground current data;
the data transmission module 120 is configured to transmit the collected ground current data to the monitoring terminal;
a ground current analysis module 130 for determining whether the ground current data matches a predetermined multipoint ground current anomaly; if the two types of the metal sheaths are matched, determining that the metal sheath of the cable has multipoint grounding abnormality;
and the maintenance alarm module 140 is used for generating alarm information of the multipoint grounding abnormality.
The application scene of the scheme can be a scene that a monitoring terminal monitors the cable metal sheath on line and analyzes whether the cable metal sheath is in multipoint grounding fault and performs maintenance warning when the grounding current is abnormal. Specifically, monitoring of the ground current, analysis of whether a multipoint ground fault of the cable metal sheath occurs or not, and generation of a maintenance warning may be performed by the monitoring terminal. After the fault warning is carried out, a worker can quickly determine the reason for causing the abnormal grounding current, and a corresponding solution is formulated to reduce the loss caused by the cable fault.
In view of the foregoing, it can be appreciated that the execution subject of the present embodiment may be the above-mentioned monitoring terminal, for example, may be a smart phone, a tablet computer, a desktop computer, other multimedia interaction devices, and the like, which is not limited herein.
The grounding current collection module 110, which may be a current transformer, may be disposed in a cable sheath grounding box, and is configured to obtain a grounding current. The ground current may be a current flowing into the ground due to the presence of an induced electromotive force in the cable metal sheath. The grounding current data can comprise the time for collecting current, the magnitude of current value and the like. The mode of obtaining the grounding current can be based on the electromagnetic induction principle. Specifically, the current transformer consists of a closed iron core and windings, a primary winding of the current transformer is connected in series in a circuit of current to be measured, and when all the current of the circuit flows through the primary winding, a secondary winding connected in series in a measuring instrument and a protection loop can convert the primary current with larger value into a secondary current with smaller value through a certain transformation ratio so as to be detected by the measuring instrument.
The data transmission module 120, which may be a signal acquisition card, may be integrally configured with a terminal device, for example, a tablet computer, a desktop computer, other multimedia interaction devices, etc., and is configured to transmit the acquired ground current data to the monitoring terminal. Specifically, the ground current signal acquired by the ground current acquisition module 110 is transmitted to the data transmission module 120 through the signal cable. The signal conditioner in the signal acquisition card firstly filters and limits the grounding current signal, filters out the interference signal in the grounding current signal and enables the interference signal to reach the range of the signal acquisition card. And then the analog ground current signal is converted into ground current data which can be analyzed and processed by the monitoring terminal through analog-digital conversion.
The ground amperometric module 130 may be a programming of a monitoring terminal for determining whether a multipoint ground anomaly exists in a metallic sheath of a cable. The multipoint grounding abnormality can be caused by the fact that the protective layer of the cable is broken, the cable protective sleeve is pierced by an object or corroded in the use process of the cable due to the fact that the manufacturing and production process of the cable is not precise, so that the metal protective sleeve is exposed at multiple positions and directly contacts with the ground. The cable metal sheath multipoint grounding abnormality can cause the cable operation faults such as the reduction of the resistance of an insulating layer, the increase of current, short circuit, fire and the like. The predetermined multipoint earthing current abnormality may be earthing current data input by a worker in advance at the monitoring terminal when the multipoint earthing abnormality occurs in the cable, or earthing current data of the cable when the multipoint earthing abnormality is collected by the monitoring terminal through big data.
The method of matching the collected grounding current data with the predetermined multipoint grounding current abnormality may be by matching data such as a numerical value of the grounding current, a current waveform, a time curve of the grounding current, and the like. Specifically, when the grounding current analysis module receives grounding current data, the grounding current analysis module analyzes the data, draws a corresponding current waveform curve, compares the drawn current waveform curve with a preset multipoint grounding current abnormality, and can determine that the multipoint grounding abnormality occurs in the cable metal sheath when the two curves are similar.
The maintenance alarm module 140 may be a program design of the monitoring terminal for performing an abnormal alarm to the terminal device of the staff. Specifically, after the ground current analysis module 130 determines that the multipoint ground fault occurs, the monitoring terminal sends a fault prompt to the terminal device of the staff. The terminal equipment of the staff can be multimedia interaction equipment such as a smart phone, a tablet personal computer, a desktop computer and the like. The content of the alert information may include: the number of ground current values, whether or not a multipoint ground abnormality occurs, the number of times a multipoint ground abnormality occurs, and the like. For example, the grounding current value is 120A, and the analysis determines that the multipoint grounding abnormality occurs in the cable metal sheath. Up to now, this cable has occurred 2 times of multipoint ground anomalies and the like in total.
The technical scheme provided by the embodiment comprises the following steps: the grounding current acquisition module is used for acquiring grounding current data; the data transmission module is used for transmitting the collected grounding current data to the monitoring terminal; the grounding current analysis module is used for determining whether the grounding current data are matched with a predetermined multipoint grounding current abnormality; if the two types of the metal sheaths are matched, determining that the metal sheath of the cable has multipoint grounding abnormality; and the maintenance alarm module is used for generating alarm information of the multipoint grounding abnormality. By executing the technical scheme, the cable metal sheath can be monitored on line, the problem of multipoint grounding of the cable metal sheath can be found in time, maintenance warning can be given rapidly, and the real-time performance and the efficiency of cable metal sheath maintenance are greatly improved.
Example two
Fig. 2 is a schematic structural diagram of a multipoint earthing on-line monitoring device for a cable metal sheath according to a second embodiment of the present application. The scheme makes better improvement on the embodiment, and the specific improvement is as follows: the grounding current analysis module is specifically configured to: and under the condition that the rise amplitude of the grounding current data exceeds the preset fluctuation range of the average value of the historical grounding current data, starting a matching algorithm to match the grounding current data with the predetermined multipoint grounding current abnormality.
As shown in fig. 2, the method specifically includes the following steps:
the ground current acquisition module 110 is configured to acquire ground current data;
the data transmission module 120 is configured to transmit the collected ground current data to the monitoring terminal;
a ground current analysis module 130 for determining whether the ground current data matches a predetermined multipoint ground current anomaly; if the two types of the metal sheaths are matched, determining that the metal sheath of the cable has multipoint grounding abnormality;
and the maintenance alarm module 140 is used for generating alarm information of the multipoint grounding abnormality.
Wherein, the ground current analysis module 130 is further configured to: and under the condition that the rise amplitude of the grounding current data exceeds the preset fluctuation range of the average value of the historical grounding current data, starting a matching algorithm to match the grounding current data with the predetermined multipoint grounding current abnormality.
The historical ground current data average may be the average of the ground current data acquired within the first 5 minutes or 10 times. The rise amplitude of the ground current data may be a difference between the current obtained ground current value and the historical ground current data average. For example: the current obtained grounding current value is 0.95A, the average value of the historical grounding current data is 0.87A, and the rising amplitude of the grounding current data is as follows:
0.95A-0.87A＝0.08A；
the rise amplitude of the ground current data can be obtained using an algorithm similar to that described above. The preset fluctuation range can be the fluctuation range of the grounding current value for ensuring the normal operation of the cable, and can be input into the monitoring terminal in advance by a worker, or can be obtained by analyzing big data by the monitoring terminal. The matching algorithm may be a program algorithm that determines whether the ground current data matches a predetermined multi-point ground current anomaly.
The technical scheme has the advantages that the abnormal condition of the grounding current can be timely found when the grounding current is detected, the analysis of the multipoint grounding abnormality is rapidly carried out after the grounding current abnormality is determined, the abnormal condition of the cable can be timely found, the time is saved for the staff to check the abnormal reasons, and the detection efficiency is improved.
Example III
Fig. 3 is a schematic structural diagram of a multipoint earthing on-line monitoring device for a cable metal sheath according to a third embodiment of the present application. The scheme makes better improvement on the embodiment, and the specific improvement is as follows: the grounding current analysis module is specifically configured to: acquiring a multipoint grounding current abnormal curve, and drawing an actually measured grounding current curve based on the grounding current data; and calculating the distance parameter and the shape parameter of the multipoint grounding current abnormal curve and the actually measured grounding current curve to reach preset conditions, and determining that the multipoint grounding abnormality exists in the metal sheath of the cable.
As shown in fig. 3, the method specifically includes the following steps:
the ground current acquisition module 110 is configured to acquire ground current data;
the data transmission module 120 is configured to transmit the collected ground current data to the monitoring terminal;
a ground current analysis module 130 for determining whether the ground current data matches a predetermined multipoint ground current anomaly; if the two types of the metal sheaths are matched, determining that the metal sheath of the cable has multipoint grounding abnormality;
and the maintenance alarm module 140 is used for generating alarm information of the multipoint grounding abnormality.
Wherein, the ground current analysis module 130 is further configured to: and under the condition that the rise amplitude of the grounding current data exceeds the preset fluctuation range of the average value of the historical grounding current data, starting a matching algorithm to match the grounding current data with the predetermined multipoint grounding current abnormality.
The method for matching the grounding current data with the predetermined multipoint grounding current abnormality specifically comprises the following steps: acquiring a multipoint grounding current abnormal curve, and drawing an actually measured grounding current curve based on the grounding current data; and calculating the distance parameter and the shape parameter of the multipoint grounding current abnormal curve and the actually measured grounding current curve to reach preset conditions, and determining that the multipoint grounding abnormality exists in the metal sheath of the cable.
The multipoint earthing current abnormal curve may be a waveform curve of the earthing current when the multipoint earthing abnormality occurs. The mode of acquiring the multipoint earthing current abnormal curve may be a waveform curve of the earthing current when the multipoint earthing abnormality occurs through the big data collection history. The actually measured ground current curve may be a waveform curve of the currently acquired ground current. The mode of drawing the actually measured grounding current curve can be used for observing and analyzing the electric signal by using an oscilloscope, and drawing the graph of the electric signal. The distance parameter between the multipoint ground current abnormal curve and the actually measured ground current curve may be an average value of the spatial distances of the points corresponding to the two tracks, that is, the euclidean distance of the points corresponding to the two curves. In particular, the true distance of two points in space, or the natural length of a vector. The euclidean distance in two and three dimensions is the actual distance between two points. For example, one point coordinate on the multipoint earthing current abnormality curve is (x 1 ，y 1 ) The coordinates of the corresponding point on the measured ground current curve are (x 2 ，y 2 ) The euclidean distance between the two points is:
wherein ρ is the point (x 1 ，y 1 ) And point (x) 2 ，y 2 ) Euclidean distance between them. And the similarity of two curvesThen it can be obtained by:
where lat represents the latitude of the coordinate point and lng represents the longitude of the coordinate point. By adopting the algorithm, the similarity of the two curves calculated according to the distance parameter between the multipoint grounding current abnormal curve and the actually measured grounding current curve can be obtained. The calculation of the shape parameters of the multipoint ground current abnormal curve and the actually measured ground current curve may be the calculation of the hausdorff distance of the two curves, i.e. the maximum value of the closest points of the two curves. Specifically, the calculation mode of the hausdorff distance may be:
d H (tr 1 ，tr 2 )＝max{h(tr 1 ，tr 2 )，h(tr 2 ，tr 1 )}；
wherein h (tr 1 ，tr 2 ) Called point tr 1 To point tr 2 Is defined as the unidirectional hausdorff distance:
by adopting the algorithm, the similarity of the two curves calculated according to the shape parameters of the multipoint grounding current abnormal curve and the actually measured grounding current curve can be obtained. The preset condition may be a requirement for similarity between the multipoint ground current abnormal curve and the measured ground current curve. For example, when the similarity of the two curves reaches 80% and above, it is determined that there is a multipoint ground current abnormality.
The advantage that this scheme set up like this is, can be through comparing the unusual curve of more point ground connection electric current with the similarity of actual measurement ground connection electric current curve confirms whether there is the multipoint ground connection electric current unusual, and the judgement process is more rigorous reliable, avoids leading to the waste of manpower and materials because of judging the mistake.
Example IV
Fig. 4 is a schematic structural diagram of a multipoint earthing on-line monitoring device for a cable metal sheath according to a fourth embodiment of the present application. The scheme makes better improvement on the embodiment, and the specific improvement is as follows: the grounding current analysis module is further specifically configured to: obtaining the difference characteristic of the actually measured grounding current curve relative to the multipoint grounding current abnormal curve; if the first difference characteristic exists, determining that the occurrence of the multipoint earthing current abnormality of the cable is caused by the corrosion and water seepage abnormality of the insulating layer of the cable; and if the second difference characteristic exists, determining that the occurrence of the cable multipoint grounding current abnormality is caused by the hard object wound abnormality of the insulating layer of the cable.
As shown in fig. 4, the method specifically includes the following steps:
the ground current acquisition module 110 is configured to acquire ground current data;
the data transmission module 120 is configured to transmit the collected ground current data to the monitoring terminal;
A ground current analysis module 130 for determining whether the ground current data matches a predetermined multipoint ground current anomaly; if the two types of the metal sheaths are matched, determining that the metal sheath of the cable has multipoint grounding abnormality;
and the maintenance alarm module 140 is used for generating alarm information of the multipoint grounding abnormality.
Wherein, the ground current analysis module 130 is further configured to: and under the condition that the rise amplitude of the grounding current data exceeds the preset fluctuation range of the average value of the historical grounding current data, starting a matching algorithm to match the grounding current data with the predetermined multipoint grounding current abnormality.
The method for matching the grounding current data with the predetermined multipoint grounding current abnormality specifically comprises the following steps: acquiring a multipoint grounding current abnormal curve, and drawing an actually measured grounding current curve based on the grounding current data; and calculating the distance parameter and the shape parameter of the multipoint grounding current abnormal curve and the actually measured grounding current curve to reach preset conditions, and determining that the multipoint grounding abnormality exists in the metal sheath of the cable.
Wherein, after determining that the metal sheath of the cable has a multipoint grounding anomaly, the method further comprises: obtaining the difference characteristic of the actually measured grounding current curve relative to the multipoint grounding current abnormal curve; if the first difference characteristic exists, determining that the occurrence of the multipoint earthing current abnormality of the cable is caused by the corrosion and water seepage abnormality of the insulating layer of the cable; and if the second difference characteristic exists, determining that the occurrence of the cable multipoint grounding current abnormality is caused by the hard object wound abnormality of the insulating layer of the cable.
The difference feature may be a portion of the measured ground current curve having a low similarity to the multipoint ground current anomaly curve. The first difference characteristic may be a predetermined difference characteristic corresponding to a curve of the cable multipoint earthing current abnormality caused by the existence of erosion and water seepage abnormality in the insulating layer of the cable. For example, the difference characteristic of the curve of the cable multipoint earthing current abnormality caused by the erosion and water seepage abnormality of the insulating layer of the cable may be that the current gradually increases with time until reaching the current peak value of the multipoint earthing current abnormality curve, and the curve of the cable multipoint earthing current abnormality caused by the erosion and water seepage abnormality of the insulating layer of the cable wholly increases more smoothly. The second difference characteristic may be a predetermined difference characteristic corresponding to a curve of the cable multipoint earthing current abnormality caused by the hard object wound abnormality of the insulating layer of the cable. For example, the difference characteristic of the curve of the cable multipoint earthing current abnormality caused by the hard object wound abnormality of the insulating layer of the cable may be that the current rapidly rises in a molar period, the current peak of the multipoint earthing current abnormality curve is reached, the curve rising trend of the cable multipoint earthing current abnormality caused by the hard object wound abnormality of the insulating layer of the cable is relatively obvious, and the like.
The advantage that this scheme set up like this is, after confirming that there is cable multiple spot earth current unusual, can also analyze the reason that produces the unusual, is favorable to the staff to overhaul the cable, has improved maintenance efficiency.
Example five
Fig. 5 is a schematic structural diagram of a multipoint earthing on-line monitoring device for a cable metal sheath according to a fifth embodiment of the present application. The scheme makes better improvement on the embodiment, and the specific improvement is as follows: the apparatus further comprises: the temperature detection module is used for acquiring temperature data of the cable metal sheath;
correspondingly, the grounding current analysis module is specifically configured to: determining whether the ground current data matches a predetermined multipoint ground current anomaly if the temperature data meets a preset temperature increase condition; if the two types of the metal sheaths are matched, determining that the metal sheaths of the cables have multipoint grounding abnormality.
As shown in fig. 5, the method specifically includes the following steps:
the ground current acquisition module 110 is configured to acquire ground current data;
the data transmission module 120 is configured to transmit the collected ground current data to the monitoring terminal;
a ground current analysis module 130 for determining whether the ground current data matches a predetermined multipoint ground current anomaly; if the two types of the metal sheaths are matched, determining that the metal sheath of the cable has multipoint grounding abnormality;
A maintenance alarm module 140, configured to generate alarm information of the multipoint grounding abnormality;
and the temperature detection module 150 is used for acquiring temperature data of the cable metal sheath.
Wherein, the ground current analysis module 130 further comprises: determining whether the ground current data matches a predetermined multipoint ground current anomaly if the temperature data meets a preset temperature increase condition; if the two types of the metal sheaths are matched, determining that the metal sheaths of the cables have multipoint grounding abnormality.
The temperature detection module 150, which may be a temperature sensor, may be integrally provided with the ground current collection module 110, for obtaining temperature data of the cable metal sheath. The mode of acquiring the temperature data of the cable metal sheath can be acquired by utilizing the characteristic that the resistance value of the thermistor is reduced along with the temperature. Specifically, the thermistor can sense the temperature change of the cable metal sheath, the self resistance value is correspondingly changed, so that the current value of a circuit where the thermistor is located is affected, and then the temperature data of the cable metal sheath can be obtained by analyzing the corresponding change of the current value and the cable metal sheath temperature.
The preset temperature increase condition may be that when a multipoint earthing current abnormality occurs, a thermal effect of the current causes temperature increase, and when the detected temperature data reaches a temperature when the multipoint earthing current abnormality occurs, the earthing current data is matched with a predetermined multipoint earthing current abnormality, and whether the multipoint earthing current abnormality occurs is detected.
The scheme has the advantages that whether the multipoint grounding current is abnormal or not can be determined through detecting the temperature of the cable metal sheath, so that the judging result is more rigorous.
Example six
Fig. 6 is a schematic structural diagram of a multipoint earthing on-line monitoring device for a cable metal sheath according to a sixth embodiment of the present application. The scheme makes better improvement on the embodiment, and the specific improvement is as follows: the grounding current analysis module is further specifically configured to: recording the abnormal times of the occurrence of the multipoint grounding abnormality; and determining and constructing a cable service life determining model in advance according to the abnormal times, and determining the safety service life of the cable.
As shown in fig. 6, the method specifically includes the following steps:
the ground current acquisition module 110 is configured to acquire ground current data;
the data transmission module 120 is configured to transmit the collected ground current data to the monitoring terminal;
a ground current analysis module 130 for determining whether the ground current data matches a predetermined multipoint ground current anomaly; if the two types of the metal sheaths are matched, determining that the metal sheath of the cable has multipoint grounding abnormality;
and the maintenance alarm module 140 is used for generating alarm information of the multipoint grounding abnormality.
Wherein, the ground current analysis module 130 is further configured to: recording the abnormal times of the occurrence of the multipoint grounding abnormality; and determining and constructing a cable service life determining model in advance according to the abnormal times, and determining the safety service life of the cable.
The pre-constructed cable service life determining model can be a relationship model between the occurrence number of the multipoint grounding abnormal conditions and the service life of the cable, which is obtained by collecting the service life of the cable and the occurrence number of the multipoint grounding abnormal conditions and performing a great amount of related training by big data. The safe life of the cable can be obtained by inputting the number of abnormalities. For example, when the grounding current analysis module records that three multi-point grounding anomalies occur in the cable sheath at intervals of 7 years, 6 years and 4 years respectively, the multi-point grounding anomalies are input into a pre-built cable service life determining model, and the safety service life of the cable can be obtained to be 3.7 years.
The advantage that this scheme set up like this is, can obtain the safe life of cable through the number of times that the record multiple spot ground connection is unusual to take place, is favorable to in time overhauling and changing the cable that has the potential safety hazard, avoids the loss because of cable fault brings.
Example seven
Fig. 7 is a flow chart of a multipoint earthing on-line monitoring method for a cable metal sheath according to a seventh embodiment of the application. As shown in fig. 7, the method specifically comprises the following steps:
S701, acquiring grounding current data through a grounding current acquisition module;
s702, transmitting the collected grounding current data to a monitoring terminal through a data transmission module;
s703, determining whether the grounding current data is matched with a predetermined multipoint grounding current abnormality through a grounding current analysis module; if the two types of the metal sheaths are matched, determining that the metal sheath of the cable has multipoint grounding abnormality;
s704, generating alarm information of the multipoint grounding abnormality through a maintenance alarm module.
On the basis of the above technical solution, optionally, the method for determining, by a ground current analysis module, whether the ground current data matches with a predetermined multipoint ground current anomaly specifically includes:
and under the condition that the rise amplitude of the grounding current data exceeds the preset fluctuation range of the average value of the historical grounding current data, starting a matching algorithm to match the grounding current data with the predetermined multipoint grounding current abnormality.
On the basis of the above technical solution, optionally, after the matching algorithm is started, the method for matching the ground current data with the predetermined multipoint ground current abnormality specifically includes:
acquiring a multipoint grounding current abnormal curve, and drawing an actually measured grounding current curve based on the grounding current data;
And calculating the distance parameter and the shape parameter of the multipoint grounding current abnormal curve and the actually measured grounding current curve to reach preset conditions, and determining that the multipoint grounding abnormality exists in the metal sheath of the cable.
In this embodiment, the ground current data is obtained by the ground current acquisition module; transmitting the collected grounding current data to a monitoring terminal through a data transmission module; determining, by a ground current analysis module, whether the ground current data matches a predetermined multipoint ground current anomaly; if the two types of the metal sheaths are matched, determining that the metal sheath of the cable has multipoint grounding abnormality; and generating alarm information of the multipoint grounding abnormality through a maintenance alarm module. By the multipoint earthing on-line monitoring method for the cable metal sheath, the cable metal sheath can be monitored on line, the multipoint earthing problem of the cable metal sheath can be found in time, maintenance warning can be given rapidly, and the real-time performance and the efficiency of the maintenance of the cable metal sheath are greatly improved.
The multipoint earthing on-line monitoring method of the cable metal sheath provided by the embodiment of the application corresponds to the multipoint earthing on-line monitoring device of the cable metal sheath provided by the embodiment, has the same functional modules and beneficial effects, and is not repeated here for avoiding repetition.
Example eight
As shown in fig. 8, an embodiment of the present application further provides an electronic device 800, including a processor 801, a memory 802, and a program or an instruction stored in the memory 802 and capable of running on the processor 801, where the program or the instruction implements each process of the embodiment of the multipoint earthing online monitoring apparatus for a cable metal sheath when executed by the processor 801, and the process can achieve the same technical effect, and is not repeated herein.
The electronic device in the embodiment of the application includes the mobile electronic device and the non-mobile electronic device.
Example nine
The embodiment of the application also provides a readable storage medium, wherein the readable storage medium stores a program or an instruction, and the program or the instruction realizes each process of the embodiment of the multipoint earthing on-line monitoring device for the cable metal sheath when being executed by a processor, and can achieve the same technical effect, so that repetition is avoided and redundant description is omitted.
Wherein the processor is a processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium such as a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk or an optical disk, and the like.
Examples ten
The embodiment of the application further provides a chip, the chip comprises a processor and a communication interface, the communication interface is coupled with the processor, the processor is used for running programs or instructions, the processes of the embodiment of the multipoint earthing on-line monitoring device for the cable metal sheath can be realized, the same technical effects can be achieved, and the repetition is avoided, so that the description is omitted.
It should be understood that the chips referred to in the embodiments of the present application may also be referred to as system-on-chip chips, chip systems, or system-on-chip chips, etc.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a computer software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method according to the embodiments of the present application.
The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are to be protected by the present application.
The foregoing description is only of the preferred embodiments of the application and the technical principles employed. The present application is not limited to the specific embodiments described herein, but is capable of numerous modifications, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the application. Therefore, while the application has been described in connection with the above embodiments, the application is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit of the application, the scope of which is set forth in the following claims.
Claims (10)
1. A multipoint earthing on-line monitoring device for a cable metal sheath, characterized in that the device comprises:
the grounding current acquisition module is used for acquiring grounding current data;
the data transmission module is used for transmitting the collected grounding current data to the monitoring terminal;
the grounding current analysis module is used for determining whether the grounding current data are matched with a predetermined multipoint grounding current abnormality; if the two types of the metal sheaths are matched, determining that the metal sheath of the cable has multipoint grounding abnormality;
and the maintenance alarm module is used for generating alarm information of the multipoint grounding abnormality.
2. The multipoint earthing on-line monitoring apparatus of a cable metal sheath according to claim 1, wherein the earthing current analysis module is specifically configured to:
and under the condition that the rise amplitude of the grounding current data exceeds the preset fluctuation range of the average value of the historical grounding current data, starting a matching algorithm to match the grounding current data with the predetermined multipoint grounding current abnormality.
3. The multipoint earthing on-line monitoring apparatus of a cable metal sheath according to claim 2, wherein the earthing current analysis module is specifically configured to:
acquiring a multipoint grounding current abnormal curve, and drawing an actually measured grounding current curve based on the grounding current data;
and calculating the distance parameter and the shape parameter of the multipoint grounding current abnormal curve and the actually measured grounding current curve to reach preset conditions, and determining that the multipoint grounding abnormality exists in the metal sheath of the cable.
4. The multipoint earthing on-line monitoring apparatus of a cable metal sheath according to claim 3, wherein the earthing current analysis module is further specifically configured to:
obtaining the difference characteristic of the actually measured grounding current curve relative to the multipoint grounding current abnormal curve;
If the first difference characteristic exists, determining that the occurrence of the multipoint earthing current abnormality of the cable is caused by the corrosion and water seepage abnormality of the insulating layer of the cable;
and if the second difference characteristic exists, determining that the occurrence of the cable multipoint grounding current abnormality is caused by the hard object wound abnormality of the insulating layer of the cable.
5. The multipoint earthing on-line monitoring apparatus for a cable metal jacket according to claim 1, further comprising:
the temperature detection module is used for acquiring temperature data of the cable metal sheath;
correspondingly, the grounding current analysis module is specifically configured to:
determining whether the ground current data matches a predetermined multipoint ground current anomaly if the temperature data meets a preset temperature increase condition; if the two types of the metal sheaths are matched, determining that the metal sheaths of the cables have multipoint grounding abnormality.
6. The multipoint earthing on-line monitoring apparatus for a cable metal sheath according to claim 1, wherein the earthing current analysis module is further specifically configured to:
recording the abnormal times of the occurrence of the multipoint grounding abnormality;
and determining and constructing a cable service life determining model in advance according to the abnormal times, and determining the safety service life of the cable.
7. A method for on-line monitoring of multipoint earthing of a cable metal sheath, the method comprising:
acquiring grounding current data through a grounding current acquisition module;
transmitting the collected grounding current data to a monitoring terminal through a data transmission module;
determining, by a ground current analysis module, whether the ground current data matches a predetermined multipoint ground current anomaly; if the two types of the metal sheaths are matched, determining that the metal sheath of the cable has multipoint grounding abnormality;
and generating alarm information of the multipoint grounding abnormality through a maintenance alarm module.
8. The method of on-line monitoring of multipoint earthing of a cable metal jacket according to claim 7, wherein the determining, by an earthing current analysis module, whether the earthing current data matches a predetermined multipoint earthing current anomaly comprises:
and under the condition that the rise amplitude of the grounding current data exceeds the preset fluctuation range of the average value of the historical grounding current data, starting a matching algorithm to match the grounding current data with the predetermined multipoint grounding current abnormality.
9. The method of on-line monitoring of multipoint earthing of a cable metal jacket according to claim 8, wherein determining whether the earthing current data matches a predetermined multipoint earthing current anomaly by an earthing current analysis module; if so, determining that the metal sheath of the cable has multipoint grounding abnormality, including:
Acquiring a multipoint grounding current abnormal curve, and drawing an actually measured grounding current curve based on the grounding current data;
and calculating the distance parameter and the shape parameter of the multipoint grounding current abnormal curve and the actually measured grounding current curve to reach preset conditions, and determining that the multipoint grounding abnormality exists in the metal sheath of the cable.
10. An electronic device comprising a processor, a memory and a program or instruction stored on the memory and executable on the processor, the program or instruction when executed by the processor implementing the steps of the method for multipoint earthing on-line monitoring of a cable metal sheath according to any one of claims 7 to 9.
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| CN202310788024.7A CN116859284A (en) | 2023-06-29 | 2023-06-29 | Multi-point grounding on-line monitoring device, method and equipment for cable metal sheath |
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| CN202310788024.7A CN116859284A (en) | 2023-06-29 | 2023-06-29 | Multi-point grounding on-line monitoring device, method and equipment for cable metal sheath |
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