CN117723899A - Cable insulation detection method and system, cable detection device and electronic equipment - Google Patents
Cable insulation detection method and system, cable detection device and electronic equipment Download PDFInfo
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Abstract
The application relates to the technical field of power supply, in particular to a cable insulation detection method and system, a cable detection device and electronic equipment. The method comprises the following steps: acquiring ground circulation data of a three-phase ground wire; acquiring cable load current data of a cable body of a three-phase cable; according to the cable load current data and the three-phase induction current, obtaining three-phase leakage current; according to the three-phase leakage current and the power frequency alternating current voltage, a three-phase leakage resistor is obtained; and if the three-phase leakage resistance is smaller than the resistance threshold value, generating an alarm signal. When the three-phase cable insulation system is used, three-phase leakage current can be obtained through grounding circulation data and cable load current data, and then three-phase leakage resistance of the three-phase insulation layer is obtained through calculation, and if the three-phase leakage resistance is smaller than a preset resistance threshold value, the abnormal insulation performance of the three-phase insulation layer of the three-phase cable is indicated, so that digital automation of the three-phase cable insulation detection process is realized, defects of the cable with abnormal insulation performance can be timely and accurately arranged, and the power supply reliability is ensured.
Description
Technical Field
The application relates to the technical field of power supply, in particular to a cable insulation detection method and system, a cable detection device and electronic equipment.
Background
With the development of society, the cable lines gradually replace overhead lines, however, the cable lines are laid underground, and the operation environment is complex. Because the cable well is filled with water or has high humidity, the cable well can be immersed into the cable, so that the cable grounding wire is insulated and wet, the insulation performance is reduced, the insulation heating and the accelerated aging are realized, and finally the cable fault is caused. As the cable lines are gradually increased, cable faults caused by abnormal insulation of the grounding wires are also continuously increased, and the power supply safety of the cable is greatly reduced.
At present, operation stability of the cable is inspected by operation and maintenance personnel at irregular period, timeliness cannot be guaranteed by a manual inspection method, defects cannot be eliminated in time due to abnormal insulativity of the cable, and power supply quality is greatly reduced. How to digitally automate the detection process of the insulation performance of the three-phase cable, so that the fault can be eliminated in time is a technical problem to be solved in the field.
Disclosure of Invention
In view of the above, the application provides a cable insulation detection method and system, a cable detection device and electronic equipment, which can digitally automate the detection process of a three-phase cable grounding wire, so that the fault can be eliminated in time.
In a first aspect, the present application provides a cable insulation detection method, which is applied to a three-phase cable, where the three-phase cable includes a three-phase wire core, a three-phase insulation layer and a three-phase metal protection layer, the three-phase insulation layer is coated on the three-phase wire core, the three-phase metal protection layer is coated on the three-phase insulation layer, and the three-phase metal protection layer leads out a three-phase ground wire; the cable insulation detection method comprises the following steps: acquiring ground circulation data of a three-phase ground wire; the grounding loop data comprise three-phase induction currents of the three-phase metal protective layer and three-phase leakage currents of the three-phase insulating layer to the three-phase metal protective layer; acquiring cable load current data of a cable body of the three-phase cable; according to the cable load current data and the three-phase induction current, obtaining the three-phase leakage current; according to the three-phase leakage current and the power frequency alternating voltage, a three-phase leakage resistor is obtained; and if the three-phase leakage resistance is smaller than a resistance threshold value, generating an alarm signal.
When the three-phase cable insulation system is used, three-phase leakage current can be obtained through detecting the obtained ground circulation data and cable load current data, then three-phase leakage resistance of the three-phase insulation layer can be obtained through calculation, if the three-phase leakage resistance is smaller than a preset resistance threshold value, insulation performance abnormality of the three-phase insulation layer of the three-phase cable is indicated, digital automation of the three-phase cable insulation detection process is realized, defects of the cable with abnormal insulation performance can be timely and accurately arranged, and power supply reliability is guaranteed.
With reference to the first aspect, in one possible implementation manner, the three-phase cable includes a first cable, a second cable and a third cable, where the first cable includes a first core, a first insulating layer and a first metal sheath that are disposed from inside to outside, a first grounding wire is led out on the first metal sheath, the second cable includes a second core, a second insulating layer and a second metal sheath that are disposed from inside to outside, a second grounding wire is led out on the second metal sheath, and the third cable includes a third core, a third insulating layer and a third metal sheath that are disposed from inside to outside, and a third grounding wire is led out on the third metal sheath; the obtaining the ground loop data of the three-phase ground wire includes: acquiring first ground circulation data of the first ground wire; the first ground loop data includes a first induced current and a first leakage current; acquiring second ground circulation data of the second ground wire; the second ground loop data includes a second induced current and a second leakage current; and acquiring third ground circulating current data of the third ground wire; the third ground loop data includes a third induced current and a third leakage current.
With reference to the first aspect, in one possible implementation manner, the acquiring cable load current data of the cable body of the three-phase cable includes: acquiring first cable load current data of a first cable body of the first cable; acquiring second cable load current data of a second cable body of the second cable; and obtaining third cable load current data of a third cable body of the third cable.
With reference to the first aspect, in one possible implementation manner, the method further includes: obtaining a three-phase difference of the cable body of the three-phase cable according to the first cable load current data, the second cable load current data and the third cable load current data; wherein, according to the cable load current data and the three-phase induced current, obtaining the three-phase leakage current includes: and screening the first grounding circulation data, the second grounding circulation data and the third grounding circulation data according to the three-phase difference, and distinguishing to obtain the first leakage current, the second leakage current and the third leakage current.
With reference to the first aspect, in one possible implementation manner, the screening the first ground circulating current data, the second ground circulating current data, and the third ground circulating current data according to the three-phase difference, and resolving the first leakage current, the second leakage current, and the third leakage current includes: screening three groups of current data with phase differences conforming to the three-phase differences from the first grounding circulation data, the second grounding circulation data and the third grounding circulation data, and respectively serving as the first induced current, the second induced current and the third induced current; screening the first induced current from the first grounding loop data to obtain the first leakage current of the first insulating layer; screening the second induced current from the second grounding loop data to obtain the second leakage current of the second insulating layer; and screening the third ground loop data to obtain the third induced current, and then obtaining the third leakage current of the third insulating layer.
With reference to the first aspect, in one possible implementation manner, the obtaining a three-phase leakage resistor according to the three-phase leakage current and the power frequency ac voltage includes: dividing the power frequency alternating current voltage by the first leakage current to obtain a first leakage resistor; dividing the power frequency alternating current voltage by the second leakage current to obtain a second leakage resistor; and dividing the power frequency alternating current voltage by the third leakage current to obtain a third leakage resistor.
With reference to the first aspect, in one possible implementation manner, if the three-phase leakage resistance is smaller than a resistance threshold, generating the alarm signal includes: if the first leakage resistance is smaller than a first preset resistance threshold value, generating the alarm signal; or if the second leakage resistance is smaller than a second preset resistance threshold value, generating the alarm signal; or if the third leakage resistance is smaller than a third preset resistance threshold value, generating the alarm signal.
In a second aspect, the present application provides a cable insulation detection system, which is applied to a three-phase cable, where the three-phase cable includes a three-phase wire core, a three-phase insulation layer and a three-phase metal protection layer, the three-phase insulation layer is coated on the three-phase wire core, the three-phase metal protection layer is coated on the three-phase insulation layer, and the three-phase metal protection layer leads out a three-phase ground wire; wherein the cable insulation detection system comprises: the ground wire current detection module is configured to: acquiring ground circulation data of the three-phase ground wire; the grounding loop data comprise three-phase induction currents of the three-phase metal protective layer and three-phase leakage currents of the three-phase insulating layer to the three-phase metal protective layer; the cable body current detection module is configured to: acquiring cable load current data of a cable body of the three-phase cable; the leakage current calculation module is respectively in communication connection with the ground wire current detection module and the cable body current detection module, and is configured to: according to the cable load current data and the three-phase induction current, obtaining the three-phase leakage current; the leakage resistance calculation module is respectively in communication connection with the ground wire current detection module and the leakage current calculation module, and the leakage resistance calculation module is configured to: according to the three-phase leakage current and the power frequency alternating voltage, a three-phase leakage resistor is obtained; and an alarm module in communication with the leakage resistance calculation module, the alarm module configured to: and if the three-phase leakage resistance is smaller than a resistance threshold value, generating an alarm signal.
In a third aspect, the present application provides a cable detection device, which is applied to a three-phase cable, where the three-phase cable includes a three-phase wire core, a three-phase insulating layer, and a three-phase metal sheath, the three-phase insulating layer is coated on the three-phase wire core, the three-phase metal sheath is coated on the three-phase insulating layer, and the three-phase metal sheath leads out a three-phase ground wire; the cable detection device includes: the grounding wire alternating current mutual inductor is connected to the three-phase grounding wire and is used for detecting grounding circulation data of the three-phase grounding wire; the grounding loop data comprise three-phase induction currents of the three-phase metal protective layer and three-phase leakage currents of the three-phase insulating layer to the three-phase metal protective layer; the grounding wire alternating current mutual inductor is electrically connected with the grounding wire current detection module of the cable insulation detection system; the cable body alternating current mutual inductor is connected to the cable body of the three-phase cable and is used for detecting cable load current data of the cable body of the three-phase cable; the cable body alternating current mutual inductor is electrically connected with the cable body current detection module of the cable insulation detection system.
In a fourth aspect, the present application provides an electronic device, including: a processor; and a memory for storing the processor-executable instructions; wherein the processor is configured to perform the cable insulation detection method of any one of the preceding claims.
Drawings
Fig. 1 is a schematic diagram of method steps of a cable insulation detection method according to an embodiment of the present application.
Fig. 2 is a schematic diagram of method steps of a cable insulation detection method according to another embodiment of the present application.
Fig. 3 is a schematic diagram of method steps of a cable insulation detection method according to another embodiment of the present application.
Fig. 4 is a schematic diagram illustrating steps of a cable insulation detection method according to another embodiment of the present application.
Fig. 5 is a schematic diagram illustrating steps of a cable insulation detection method according to another embodiment of the present application.
Fig. 6 is a schematic diagram illustrating steps of a cable insulation detection method according to another embodiment of the present application.
Fig. 7 is a schematic diagram of method steps of a cable insulation detection method according to another embodiment of the present application.
Fig. 8 is a schematic system structure of a cable insulation detection system according to an embodiment of the present application.
Fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Fig. 10 is a schematic cross-sectional view of a three-phase cable used in the present application.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
An exemplary cable insulation detection method is as follows:
fig. 1 is a schematic diagram of method steps of a cable insulation detection method according to an embodiment of the present application. The application provides a cable insulation detection method, which is applied to a three-phase cable, wherein the three-phase cable comprises a three-phase wire core, a three-phase insulating layer and a three-phase metal protection layer, the three-phase wire core is coated with the three-phase insulating layer, the three-phase metal protection layer is coated with the three-phase insulating layer, and the three-phase metal protection layer is led out of a three-phase grounding wire. As shown in fig. 1, the cable insulation detection method includes:
and 110, acquiring ground circulation data of the three-phase ground wire.
In this step, ac transformer coils may be disposed on three ground wires corresponding to the three-phase cable, so as to detect and obtain ground circulation data of each ground wire. The grounding loop data comprises three-phase induction current of the three-phase metal protective layer and three-phase leakage current of the three-phase insulating layer leaked to the three-phase metal protective layer, but the three-phase induction current and the three-phase leakage current cannot be directly separated and distinguished.
And 120, acquiring cable load current data of a cable body of the three-phase cable.
In this step, ac transformer coils may be disposed on three cable lines of the three-phase cable so as to detect and obtain cable load current data of each cable.
And 130, obtaining three-phase leakage current according to the cable load current data and the three-phase induction current.
In this step, the three-phase induced current leaks from the three-phase insulating layer to the three-phase metal sheath, so that the magnitude of the three-phase induced current is substantially equal, the frequencies are the same, the phases are 120 ° different, and the phase difference of the phase angles of the three-phase induced currents is substantially the same as the phase difference of the phase angles of the cable load currents of the three-phase cable. The three-phase insulating layer is capacitive, so that the insulating performance of the three-phase insulating layer is reduced, the frequency of the three-phase leakage current is the same, the size is different, the phase is changed, the induced current in the grounding circulation detected on the three-phase grounding line is identified and separated by utilizing the phase difference of the phase angle of the detected cable load current, and the three-phase leakage current is left after the three-phase induced current with the same phase difference as the cable load current is removed.
And 140, obtaining the three-phase leakage resistor according to the three-phase leakage current and the power frequency alternating voltage.
In the step, the power frequency alternating voltage is divided by the three-phase leakage current, so that the three-phase leakage resistance of the three-phase insulating layer can be obtained.
And 150, if the three-phase leakage resistance is smaller than the resistance threshold value, generating an alarm signal.
When the method is applied, the three-phase leakage current can be obtained through detecting the obtained ground circulation data and the cable load current data, then the three-phase leakage resistance of the three-phase insulating layer can be obtained through calculation, if the three-phase leakage resistance is smaller than the preset resistance threshold value, the abnormal insulating performance of the three-phase insulating layer of the three-phase cable is indicated, the digital automation of the detecting process of the insulating performance of the three-phase cable is realized, the defect can be timely and accurately arranged on the cable with the abnormal insulating performance, and the power supply reliability is ensured.
Fig. 10 is a schematic cross-sectional view of a three-phase cable used in the present application. Referring to fig. 10, the three-phase cable includes a first cable 1, a second cable 2, and a third cable 3. The first cable 1 comprises a first wire core 101, a first insulating layer 102, a first metal protecting layer 103 and a first outer protecting layer 104 which are arranged from inside to outside, wherein a first grounding wire 105 is led out of the first metal protecting layer 103. The second cable 2 comprises a second wire core 201, a second insulating layer 202, a second metal protecting layer 203 and a second outer protecting layer 204, wherein the second wire core is arranged from inside to outside, and a second grounding wire 205 is led out from the second metal protecting layer 203. The third cable 3 comprises a third wire core 301, a third insulating layer 302, a third metal sheath 303 and a third outer sheath 304 which are arranged from inside to outside, and a third ground wire 305 is led out from the third metal sheath 303. In addition, a layer of cladding is generally provided outside the first cable 1, the second cable 2 and the third cable 3, and the first cable 1, the second cable 2 and the third cable 3 are wrapped for protection, and the cladding is not shown in the figure.
Fig. 2 is a schematic diagram of method steps of a cable insulation detection method according to another embodiment of the present application. In one embodiment, as shown in FIG. 2, step 110 includes:
step 111, first ground circulation data of the first ground line 105 is acquired.
In this step, the first ground loop data includes a first induced current and a first leakage current.
Step 112, obtaining second ground circulation data of the second ground line 205.
In this step, the second ground loop data includes a second induced current and a second leakage current.
Step 113, third ground circulation data of the third ground line 305 is acquired.
In this step, the third ground loop data includes a third induced current and a third leakage current.
Fig. 3 is a schematic diagram of method steps of a cable insulation detection method according to another embodiment of the present application. In one embodiment, as shown in FIG. 3, step 120 includes:
step 121, obtaining first cable load current data of a first cable body of a first cable.
In this step, an ac transformer is disposed on the first outer jacket 104, so as to obtain first cable load current data of the first cable body.
Step 122, obtaining second cable load current data of a second cable body of the second cable.
In this step, an ac transformer is disposed on the second outer jacket 204, so as to obtain second cable load current data of the second cable body.
And step 123, obtaining third cable load current data of a third cable body of the third cable.
In this step, an ac transformer is disposed on the third outer protective layer 304, so as to obtain third cable load current data of the third cable body.
Fig. 4 is a schematic diagram illustrating steps of a cable insulation detection method according to another embodiment of the present application. In one embodiment, as shown in fig. 4, the cable insulation detection method further includes:
and 160, obtaining a three-phase difference of the cable body of the three-phase cable according to the first cable load current data, the second cable load current data and the third cable load current data.
Wherein step 130 comprises:
and 131, screening the first ground circulation data, the second ground circulation data and the third ground circulation data according to the three-phase difference, and distinguishing to obtain a first leakage current, a second leakage current and a third leakage current.
In this embodiment, for example, if the three-phase difference of the cable body of the three-phase cable is 120 °, three sets of data with the same phase difference of 120 ° are screened from the first ground circulation data, the second ground circulation data, and the third ground circulation data, and the three sets of data are the first induced current, the second induced current, and the third induced current.
Fig. 5 is a schematic diagram illustrating steps of a cable insulation detection method according to another embodiment of the present application. In one embodiment, as shown in fig. 5, step 131 includes:
in step 1311, three sets of current data with phase differences corresponding to the three-phase differences are screened from the first ground circulation data, the second ground circulation data and the third ground circulation data, and are respectively used as the first induced current, the second induced current and the third induced current.
Step 1312, obtaining the first leakage current of the first insulating layer 102 after screening the first ground loop data to obtain the first induced current.
Step 1313, obtaining the second leakage current of the second insulating layer 202 after screening the second ground loop data to obtain the second induced current.
In step 1314, the third leakage current of the third insulating layer 302 is obtained after the third induced current is obtained by screening the third ground loop data.
Fig. 6 is a schematic diagram illustrating steps of a cable insulation detection method according to another embodiment of the present application. In one embodiment, as shown in fig. 6, step 140 includes:
step 141, dividing the power frequency alternating current voltage by the first leakage current to obtain a first leakage resistor.
Step 142, dividing the power frequency ac voltage by the second leakage current to obtain a second leakage resistance.
And step 143, dividing the power frequency alternating current voltage by the third leakage current to obtain a third leakage resistor.
Fig. 7 is a schematic diagram of method steps of a cable insulation detection method according to another embodiment of the present application. In one embodiment, as shown in FIG. 7, step 150 comprises:
and 151, if the first leakage resistance is smaller than a first preset resistance threshold value, generating an alarm signal. Or alternatively
Step 152, if the second leakage resistance is smaller than the second preset resistance threshold, generating an alarm signal. Or alternatively
Step 153, if the third leakage resistance is smaller than the third preset resistance threshold, generating an alarm signal.
In this embodiment, when one of the steps 151, 152 and 153 occurs, an alarm signal is generated to alarm.
An exemplary cable insulation detection system is as follows:
fig. 8 is a schematic system structure of a cable insulation detection system according to an embodiment of the present application. In a second aspect, the application provides a cable insulation detection system, is applied to the three-phase cable, and the three-phase cable includes three-phase sinle silk, three-phase insulating layer and three-phase metal sheath, and the cladding of three-phase insulating layer is on three-phase sinle silk, and the cladding of three-phase metal sheath is on three-phase insulating layer, and three-phase metal sheath draws out three-phase earth connection. As shown in fig. 8, the system includes a ground line current detection module 801, a cable body current detection module 802, a leakage current calculation module 803, a leakage resistance calculation module 804, and an alarm module 805.
The ground line current detection module 801 is configured to: acquiring ground circulation data of the three-phase ground wire; the grounding loop data comprises three-phase induction currents of the three-phase metal protective layer and three-phase leakage currents of the three-phase insulating layer to the three-phase metal protective layer.
The cable body current detection module 802 is configured to: acquiring cable load current data of a cable body of a three-phase cable;
the leakage current calculation module 803 is communicatively connected to the ground line current detection module 801 and the cable body current detection module 802, respectively, and the leakage current calculation module 803 is configured to: and obtaining three-phase leakage current according to the cable load current data and the three-phase induction current.
The leakage resistance calculation module 804 is communicatively connected to the ground line current detection module 801 and the leakage current calculation module 803, respectively, and the leakage resistance calculation module 804 is configured to: and obtaining the three-phase leakage resistor according to the three-phase leakage current and the power frequency alternating current voltage.
The alarm module 805 is communicatively connected to the leakage resistance calculation module 804, the alarm module 805 being configured to: and if the three-phase leakage resistance is smaller than the resistance threshold value, generating an alarm signal.
An exemplary cable detection device is as follows:
the application also provides a cable detection device, is applied to three-phase cable, and three-phase cable includes three-phase sinle silk, three-phase insulating layer and three-phase metal sheath, and the cladding of three-phase insulating layer is on three-phase sinle silk, and the cladding of three-phase metal sheath is on three-phase insulating layer, and three-phase earth connection is drawn forth to three-phase metal sheath. The cable detection device comprises a grounding wire alternating current mutual inductance device and a cable body alternating current mutual inductance device.
The grounding wire alternating current mutual inductor is connected to the three-phase grounding wire and used for detecting grounding circulation data of the three-phase grounding wire; the grounding loop data comprise three-phase induction currents of the three-phase metal protective layer and three-phase leakage currents of the three-phase insulating layer to the three-phase metal protective layer; the grounding wire alternating current mutual inductor is electrically connected with the grounding wire current detection module of the cable insulation detection system.
The cable body alternating current mutual inductor is connected to the cable body of the three-phase cable and is used for detecting cable load current data of the cable body of the three-phase cable; the cable body alternating current mutual inductor is electrically connected with the cable body current detection module of the cable insulation detection system.
Next, an electronic device according to an embodiment of the present application is described with reference to fig. 9. Fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
As shown in fig. 9, the electronic device 901 includes one or more processors 9011 and memory 9012.
The processor 9011 may be a Central Processing Unit (CPU) or other form of processing unit having data processing capabilities and/or instruction execution capabilities, and may control other components in the electronic device 901 to perform desired functions.
Memory 9012 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and/or non-volatile memory. The volatile memory may include, for example, random Access Memory (RAM) and/or cache memory (cache), and the like. The non-volatile memory may include, for example, read Only Memory (ROM), hard disk, flash memory, and the like. One or more computer program instructions may be stored on the computer readable storage medium that can be executed by the processor 9011 to implement the cable insulation detection method methods of the various embodiments of the present application described above, or other desired functions. Various contents such as a cable insulation detection method error parameter may also be stored in the computer-readable storage medium.
In one example, the electronic device 901 may further include: an input device 9013 and an output device 9014, which are interconnected by a bus system and/or other forms of connection mechanisms (not shown).
The input device 9013 may include, for example, a keyboard, mouse, joystick, touch screen, and the like.
The output device 9014 may output various information to the outside, including the determined exercise data, and the like. The output means 9014 may comprise, for example, a display, a communication network, a remote output device to which it is connected, and so forth.
Of course, only some of the components of the electronic device 901 relevant to the present application are shown in fig. 9 for simplicity, components such as buses, input/output interfaces, and the like being omitted. In addition, the electronic device 901 may include any other suitable components depending on the particular application.
In addition to the methods and apparatus described above, embodiments of the present application may also be a computer program product comprising computer program instructions which, when executed by a processor, cause the processor to perform the steps in the cable insulation detection method according to the various embodiments of the present application described in the present specification.
The computer program product may write program code for performing the operations of embodiments of the present application in any combination of one or more programming languages, including an object oriented programming language such as Java, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device, partly on a remote computing device, or entirely on the remote computing device or server.
Furthermore, embodiments of the present application may also be a computer-readable storage medium, having stored thereon computer program instructions, which when executed by a processor, cause the processor to perform the steps in the cable insulation detection method according to various embodiments of the present application.
The computer readable storage medium may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium may include, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium would include the following: an electrical connection having one or more wires, a portable disk, a hard disk, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The basic principles of the present application have been described above in connection with specific embodiments, however, it should be noted that the advantages, benefits, effects, etc. mentioned in the present application are merely examples and not limiting, and these advantages, benefits, effects, etc. are not to be considered as necessarily possessed by the various embodiments of the present application. Furthermore, the specific details disclosed herein are for purposes of illustration and understanding only, and are not intended to be limiting, as the application is not intended to be limited to the details disclosed herein as such.
The block diagrams of the devices, apparatuses, devices, systems referred to in this application are only illustrative examples and are not intended to require or imply that the connections, arrangements, configurations must be made in the manner shown in the block diagrams. As will be appreciated by one of skill in the art, the devices, apparatuses, devices, systems may be connected, arranged, configured in any manner. Words such as "including," "comprising," "having," and the like are words of openness and mean "including but not limited to," and are used interchangeably therewith. The terms "or" and "as used herein refer to and are used interchangeably with the term" and/or "unless the context clearly indicates otherwise. The term "such as" as used herein refers to, and is used interchangeably with, the phrase "such as, but not limited to.
It is also noted that in the apparatus, devices and methods of the present application, the components or steps may be disassembled and/or assembled. Such decomposition and/or recombination should be considered as equivalent to the present application.
The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the application. Thus, the present application is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing description of the preferred embodiments of the present invention is not intended to limit the invention to the precise form disclosed, and any modifications, equivalents, and alternatives falling within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The cable insulation detection method is characterized by being applied to a three-phase cable, wherein the three-phase cable comprises a three-phase wire core, a three-phase insulating layer and a three-phase metal protective layer, the three-phase insulating layer is coated on the three-phase wire core, the three-phase metal protective layer is coated on the three-phase insulating layer, and the three-phase metal protective layer is led out of a three-phase grounding wire; the cable insulation detection method comprises the following steps:
acquiring ground circulation data of the three-phase ground wire; the grounding loop data comprise three-phase induction currents of the three-phase metal protective layer and three-phase leakage currents of the three-phase insulating layer to the three-phase metal protective layer;
acquiring cable load current data of a cable body of the three-phase cable;
according to the cable load current data and the three-phase induction current, obtaining the three-phase leakage current;
according to the three-phase leakage current and the power frequency alternating voltage, a three-phase leakage resistor is obtained; and
and if the three-phase leakage resistance is smaller than a resistance threshold value, generating an alarm signal.
2. The cable insulation detection method according to claim 1, wherein the three-phase cable comprises a first cable, a second cable and a third cable, the first cable comprises a first wire core, a first insulating layer and a first metal protection layer which are arranged from inside to outside, a first grounding wire is led out from the first metal protection layer, the second cable comprises a second wire core, a second insulating layer and a second metal protection layer which are arranged from inside to outside, a second grounding wire is led out from the second metal protection layer, the third cable comprises a third wire core, a third insulating layer and a third metal protection layer which are arranged from inside to outside, and a third grounding wire is led out from the third metal protection layer; the obtaining the ground loop data of the three-phase ground wire includes:
acquiring first ground circulation data of the first ground wire; the first ground loop data includes a first induced current and a first leakage current;
acquiring second ground circulation data of the second ground wire; the second ground loop data includes a second induced current and a second leakage current; and
acquiring third ground circulation data of the third ground wire; the third ground loop data includes a third induced current and a third leakage current.
3. The cable insulation detection method according to claim 2, wherein the acquiring cable load current data of the cable body of the three-phase cable includes:
acquiring first cable load current data of a first cable body of the first cable;
acquiring second cable load current data of a second cable body of the second cable; and
and acquiring third cable load current data of a third cable body of the third cable.
4. A cable insulation detection method according to claim 3, further comprising:
obtaining a three-phase difference of the cable body of the three-phase cable according to the first cable load current data, the second cable load current data and the third cable load current data;
wherein, according to the cable load current data and the three-phase induced current, obtaining the three-phase leakage current includes:
and screening the first grounding circulation data, the second grounding circulation data and the third grounding circulation data according to the three-phase difference, and distinguishing to obtain the first leakage current, the second leakage current and the third leakage current.
5. The method according to claim 4, wherein the screening the first ground loop data, the second ground loop data, and the third ground loop data according to the three-phase difference to obtain the first leakage current, the second leakage current, and the third leakage current includes:
screening three groups of current data with phase differences conforming to the three-phase differences from the first grounding circulation data, the second grounding circulation data and the third grounding circulation data, and respectively serving as the first induced current, the second induced current and the third induced current;
screening the first induced current from the first grounding loop data to obtain the first leakage current of the first insulating layer;
screening the second induced current from the second grounding loop data to obtain the second leakage current of the second insulating layer; and
and screening the third induced current from the third grounding loop data to obtain the third leakage current of the third insulating layer.
6. The method of claim 5, wherein obtaining a three-phase leakage resistance from the three-phase leakage current and the power frequency ac voltage comprises:
dividing the power frequency alternating current voltage by the first leakage current to obtain a first leakage resistor;
dividing the power frequency alternating current voltage by the second leakage current to obtain a second leakage resistor; and
dividing the power frequency alternating current voltage by the third leakage current to obtain a third leakage resistor.
7. The method of claim 6, wherein generating an alarm signal if the three-phase leakage resistance is less than a resistance threshold comprises:
if the first leakage resistance is smaller than a first preset resistance threshold value, generating the alarm signal; or (b)
If the second leakage resistance is smaller than a second preset resistance threshold value, generating the alarm signal; or (b)
And if the third leakage resistance is smaller than a third preset resistance threshold value, generating the alarm signal.
8. A cable insulation detection system, comprising: the ground wire current detection module is configured to: acquiring ground circulation data of a three-phase ground wire; the grounding loop data comprise three-phase induction currents of the three-phase metal protective layer and three-phase leakage currents of the three-phase insulating layer to the three-phase metal protective layer; the cable body current detection module is configured to: acquiring cable load current data of a cable body of a three-phase cable; the leakage current calculation module is respectively in communication connection with the ground wire current detection module and the cable body current detection module, and is configured to: according to the cable load current data and the three-phase induction current, obtaining the three-phase leakage current; the leakage resistance calculation module is respectively in communication connection with the ground wire current detection module and the leakage current calculation module, and the leakage resistance calculation module is configured to: according to the three-phase leakage current and the power frequency alternating voltage, a three-phase leakage resistor is obtained; and an alarm module in communication with the leakage resistance calculation module, the alarm module configured to: and if the three-phase leakage resistance is smaller than a resistance threshold value, generating an alarm signal.
9. The cable detection device is characterized by being applied to a three-phase cable, wherein the three-phase cable comprises a three-phase wire core, a three-phase insulating layer and a three-phase metal protective layer, the three-phase insulating layer is coated on the three-phase wire core, the three-phase metal protective layer is coated on the three-phase insulating layer, and the three-phase metal protective layer is led out of a three-phase grounding wire; the cable detection device includes:
the grounding wire alternating current mutual inductor is connected to the three-phase grounding wire and is used for detecting grounding circulation data of the three-phase grounding wire; the grounding loop data comprise three-phase induction currents of the three-phase metal protective layer and three-phase leakage currents of the three-phase insulating layer to the three-phase metal protective layer; the ground wire alternating current transformer is electrically connected with the ground wire current detection module of the cable insulation detection system according to claim 8; and
the cable body alternating current mutual inductor is connected to the cable body of the three-phase cable and is used for detecting cable load current data of the cable body of the three-phase cable; the cable body ac transformer is electrically connected to the cable body current detection module of the cable insulation detection system of claim 8.
10. An electronic device, the electronic device comprising:
a processor; and
a memory for storing the processor-executable instructions;
wherein the processor is configured to perform the cable insulation detection method of any of the preceding claims 1 to 7.
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| CN202311639406.XA CN117723899A (en) | 2023-12-01 | 2023-12-01 | Cable insulation detection method and system, cable detection device and electronic equipment |
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| CN202311639406.XA CN117723899A (en) | 2023-12-01 | 2023-12-01 | Cable insulation detection method and system, cable detection device and electronic equipment |
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