CN111157915A - Cable leakage current detection method and device, storage medium and processor - Google Patents
Cable leakage current detection method and device, storage medium and processor Download PDFInfo
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- CN111157915A CN111157915A CN201911425486.2A CN201911425486A CN111157915A CN 111157915 A CN111157915 A CN 111157915A CN 201911425486 A CN201911425486 A CN 201911425486A CN 111157915 A CN111157915 A CN 111157915A
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Abstract
The invention discloses a cable leakage current detection method and device, a storage medium and a processor. Wherein, the method comprises the following steps: acquiring the current of a grounding wire at two ends of a section to be detected of the cable; and determining the leakage current value of the section to be detected of the cable according to the obtained current of the grounding wire. The invention solves the technical problem that the insulation detection of the cable is difficult in the related technology.
Description
Technical Field
The invention relates to the field of cables, in particular to a method and a device for detecting leakage current of a cable, a storage medium and a processor.
Background
The power cable has the advantages of small occupied area, convenience in erection and maintenance and the like, so that the power cable is more and more widely applied to a power system. However, due to the environment or the quality of the cable, the cable insulation damage happens sometimes, and insulation breakdown can be caused in serious cases, so that power failure accidents are caused. At present, the cable insulation detection technology is mainly offline maintenance and needs cable power-off, but the cable power-off brings inconvenience and huge economic loss to users. Moreover, the cable can be subjected to a pressurization experiment during maintenance, and the pressurization experiment can also aggravate insulation damage, even damage the original well-insulated cable, and shorten the service life of the cable.
Therefore, in the related art, it is difficult to perform insulation detection on the cable.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a method and a device for detecting cable leakage current, a storage medium and a processor, which are used for at least solving the technical problem that the insulation detection of a cable is difficult in the related technology.
According to an aspect of an embodiment of the present invention, there is provided a cable leakage current detection method including: acquiring the current of a grounding wire at two ends of a section to be detected of the cable; and determining the leakage current value of the section to be detected of the cable according to the obtained current of the grounding wire.
Optionally, under the condition that the metal protective sheath at the section both ends of waiting to detect is directly grounded to the cable, obtain the cable and wait to detect the earth connection electric current at section both ends and include: acquiring the current of the grounding wire of any phase at two ends of the section to be detected of the cable; according to the obtained current of the grounding wire, the step of determining the leakage current value of the section to be detected of the cable comprises the following steps: and subtracting the obtained current of the ground wire connected with the two ends of the section to be detected of the cable to obtain the phase leakage current value in the section to be detected of the cable.
Optionally, under the condition that one end of the section to be detected of the cable is directly grounded and the other end is grounded through the protector, determining the leakage current value of the section to be detected of the cable according to the obtained grounding line current comprises: and determining the current of the grounding wire on the direct grounding wire as the leakage current value of the section to be detected of the cable.
Optionally, under the condition that a through joint is installed at the middle position of the section to be detected of the cable and is directly grounded, determining the leakage current value of the section to be detected of the cable according to the obtained current of the grounding wire comprises: and determining the current of the grounding wire on the direct grounding wire of which the middle part is provided with the direct-through connector and is directly grounded as the leakage current value of the section to be detected of the cable.
Optionally, the section to be detected of the cable is divided into three subsections, the metal sheath at the terminal of the section to be detected of the cable is grounded through a direct grounding box, the metal sheath at the joint is connected to a connecting box through a coaxial cable and is in the connecting box under the condition that the metal sheath cross-connection transposition is completed, according to the obtained current of the grounding wire, the leakage current value of the section to be detected of the cable is determined to include: and obtaining the current of the grounding wire at two ends of any subsection in the three subsections, and determining the leakage current value of the subsection according to the current of the grounding wire at two ends of the subsection.
Optionally, the section to be detected of the cable is divided into three subsections, each subsection includes three phases of a, B, and C, the metal sheath at the terminal of the section to be detected of the cable is grounded through a direct grounding box, the metal sheath at the joint is connected to a connection box through a coaxial cable, and under the condition that the metal sheath cross interconnection transposition is completed in the connection box, according to the obtained current of the grounding wire, determining the leakage current value of the section to be detected of the cable includes: and obtaining the current value of the grounding wire at two ends of any phase of any subsection, and determining the leakage current value of the phase of the subsection according to the current values of the grounding wires at two ends of the phase of the subsection.
Optionally, the current of the ground wire at the two ends of the section to be detected of the cable is obtained through a current transformer.
According to another aspect of the embodiments of the present invention, there is also provided a cable leakage current detection apparatus, including: the acquisition module is used for acquiring the current of the grounding wires at two ends of the section to be detected of the cable; and the determining module is used for determining the leakage current value of the section to be detected of the cable according to the acquired current of the grounding wire.
According to a further aspect of the embodiments of the present invention, there is also provided a storage medium including a stored program, wherein when the program runs, a device in which the storage medium is located is controlled to execute any one of the above-mentioned cable leakage current detection methods.
According to still another aspect of the embodiments of the present invention, there is also provided a processor for executing a program, wherein the program executes to perform any one of the above-mentioned cable leakage current detection methods.
In the embodiment of the invention, the leakage current value of the section to be detected of the cable is determined according to the current of the grounding wires at the two ends of the section to be detected of the cable, and the leakage current value of the cable is determined according to the current of the grounding wires, so that the purpose of carrying out insulation detection on the cable without power failure is achieved, the technical effect of carrying out insulation detection on the cable on line is realized, and the technical problem that the insulation detection on the cable is difficult in the related technology is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a flow chart of a cable leakage current detection method according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of a cable termination direct ground and current sensor mounting location provided in accordance with an embodiment of the present invention;
FIG. 3 is a schematic illustration of leakage current and circulating current flow directions in a cable direct ground loop provided in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram of a cable provided in accordance with an embodiment of the present invention with one end directly grounded and the other end grounded through a protector;
FIG. 5 is a schematic diagram of a single point direct grounding condition provided at a central portion of a cable according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a three-port cross-connect of cables and a current sensor mounting arrangement in a ground box provided in accordance with an embodiment of the present invention;
FIG. 7 is a schematic diagram of a six-port cross-connect, and current sensor mounting arrangement in a grounded tank, in accordance with an embodiment of the invention;
fig. 8 is a block diagram of a cable leakage current detection apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above 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 is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In accordance with an embodiment of the present invention, there is provided a method embodiment of a cable leakage current detection method, it is noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system, such as a set of computer executable instructions, and that while a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than presented herein.
Fig. 1 is a flowchart of a cable leakage current detection method according to an embodiment of the present invention, as shown in fig. 1, the method including the steps of:
step S102, obtaining the current of the grounding wires at two ends of the section to be detected of the cable;
and step S104, determining the leakage current value of the section to be detected of the cable according to the obtained current of the grounding wire.
Through the steps, based on the flowing characteristics of induced sheath circulation currents and grounding currents in the grounding currents, the mode of determining the leakage current value of the section to be detected of the cable according to the grounding line currents at the two ends of the section to be detected of the cable is adopted, and the purpose of carrying out insulation detection on the cable without power failure is achieved by determining the leakage current value of the cable according to the grounding line currents, so that the technical effect of carrying out insulation detection on the cable on line is achieved, and the technical problem that the insulation detection on the cable is difficult in the related technology is solved.
As an alternative embodiment, when the ground line current at two ends of the section of the cable to be detected is obtained, the ground line current can be obtained in various ways. For example, the current of the ground wire at two ends of the section to be detected of the cable can be obtained through a current transformer. It should be noted that the current can be obtained by other methods, and since the method of obtaining the ground current by the current transformer is relatively direct, the detection efficiency can be improved to a certain extent.
As an alternative embodiment, when the leakage current value of the section to be detected of the cable is determined according to the obtained current of the grounding wire, various ways may also be used. For example, the leakage current value of the section to be detected of the cable can be determined by simply adding and subtracting the acquired grounding wire current. For example, the current value of the cable leakage current can be obtained by directly subtracting the current of two adjacent ground wires.
It should be noted that, when the cable leakage current detection method is adopted, the following different optional detection methods can be adopted according to the different line lengths of the cables to be detected and the different grounding conditions, which are respectively described below.
In addition, the method can be used for cables made of various types of materials, for example, cables made of Cross-linked Polyethylene (XLPE). In the embodiment of the present invention, an XLPE cable is taken as an example for description.
(1) Under the condition that the metal protective sheath at the section both ends of waiting to detect at the cable directly ground connection, it includes to obtain the earth connection electric current that the section both ends were waiting to detect at the cable: acquiring the current of a grounding wire of any phase at two ends of a section to be detected of the cable; according to the obtained current of the grounding wire, the step of determining the leakage current value of the section to be detected of the cable comprises the following steps: and subtracting the obtained current of the ground wire connected with the two ends of the section to be detected of the cable to obtain the value of the phase leakage current in the section to be detected of the cable. Briefly, when metal sheaths at two ends of a cable are directly grounded, six current transformers are installed on a grounding wire, and the current values measured by corresponding phase current sensors are subtracted to obtain the leakage current value of the phase cable. The following description is made with reference to the drawings.
When the metal sheaths at the two ends of the cable are directly grounded, and the cable utilizes a short cable line which is small in size, large in margin, small in load and only in a range of dozens of meters, the leakage current of the cable can be detected by adopting the following method. Fig. 2 is a schematic diagram of a direct grounding of a cable termination and a mounting position of a current sensor according to an embodiment of the present invention, as shown in fig. 2, a three-phase cable termination is grounded through a direct grounding box, and six current transformers are mounted on a grounding line, and the measured currents thereof are I1a、I1b、I1c、I2b、I2b、I2c。
The load current induces an induced voltage on the metal sheath and forms a closed loop with the ground to form a sheath loop current Ima、Imb、Imc. The leakage current I is formed by the current of the high-voltage cable core current flowing through the main insulation to the metal protective layerA、IB、IC. FIG. 3 is a schematic diagram of the leakage current and the circulation current flowing direction in the direct grounding loop of the cable according to the embodiment of the invention, as shown in FIG. 3, when the current transformer is used for measuring the current of the grounding sheath of the cable, the cable can be obtainedThe leakage current of the three phases is calculated as shown in equation one below.
(2) The one end direct ground connection of waiting to examine the section at the cable, under the other end passed through the protector ground connection's the condition, according to the earth connection electric current that obtains, confirms that the cable waits to examine section leakage current value and includes: and determining the current of the grounding wire on the direct grounding wire as the leakage current value of the section to be detected of the cable. In a simpler aspect, when one end of the cable is directly grounded through a single point and the other end of the cable is grounded through the protector, three current sensors are installed on the direct grounding line, and the current measured by the current sensors is the leakage current value of the cable. The following description is made with reference to the drawings.
When the length of the cable is generally less than 500m and the induced voltage value is within the safety limit range, one end of the cable can reasonably select the grounding protection box and the protection element, and the other end of the cable is directly grounded. Fig. 4 is a schematic view of a case where one end of a cable is directly grounded and the other end is grounded through a protector according to an embodiment of the present invention, as shown in fig. 4. This grounding method is often applied to a hybrid line mainly including an overhead line. When a single end of a high-voltage single-core cable is directly grounded, a loop cannot be formed between the single end of the high-voltage single-core cable and the ground, and only leakage current flows in a cable sheath, so that when the current is measured by a current transformer, the measured value is equal to the leakage current, and the calculation of the leakage current is shown in the following formula II in the grounding mode.
(3) Under the condition that the intermediate position installation through connection of the section of waiting to detect of cable directly connects ground connection, according to the earth connection electric current that obtains, confirm that the section of waiting to detect of cable leaks current value and include: and determining the current of the grounding wire on the direct grounding wire with the direct-through joint directly grounded in the middle as the leakage current value of the section to be detected of the cable. In a simple aspect, when the direct-through connector is installed at the middle part of the cable and is directly grounded, three current sensors are installed on the direct grounding line, and the current measured by the current sensors is the leakage current value of the cable. The following description is made with reference to the drawings.
When the length of the cable is 1000-1400 m, the middle part of the cable can be directly grounded, and a through connector can be arranged at the grounding point. Fig. 5 is a schematic diagram of a single-point direct grounding situation of a central portion of a cable according to an embodiment of the present invention, as shown in fig. 5, the single-point direct grounding manner of the central portion of the cable is equivalent to a series connection of two one-end grounding manners, so that only leakage current flows through a sheath of the cable, and metal shielding layers at two ends of the grounding point are half of power frequency induced voltage during normal operation.
Wherein, when the cable middle part is installed with a direct joint for direct grounding, the cable shielding layer is not required to be disconnected, so that the current I is measured by a current transformer1aNamely, the leakage current of the whole cable section is obtained, and the calculation formula of the leakage current is shown as the following formula three in the grounding mode.
(4) Waiting to examine the section of examining at the cable and being divided into three subsections, the section of examining terminal department metal sheath is examined to the cable is through direct grounding box ground connection, and joint department metal sheath is connected to the connecting box through coaxial cable and accomplishes the condition that metal sheath cross-connection transposed in the connecting box under, according to the earth connection electric current that obtains, confirms that the section of examining leakage current value includes to the cable: and obtaining the current of the grounding wire at two ends of any subsection in the three subsections, and determining the leakage current value of the subsection according to the current of the grounding wire at two ends of the subsection. Briefly, when the cable is divided into 3 subsections (1 unit), the metal sheath at the cable terminal is grounded through a direct grounding box, the metal sheath at the joint is connected to a junction box through a coaxial cable and the metal sheath cross-connection transposition is completed in the junction box. The leakage current value of each section of cable can be obtained by adding or subtracting the measurement values obtained by six current transformers arranged at the two ends of each subsection of the cable. The following description is made with reference to the drawings.
When a cable line is long, according to the design specification of a cable in GB50217-2007 power engineering, the normal induction voltage on the metal protective layer at the ungrounded end is not more than 50V, and when a safety measure capable of effectively preventing personnel from contacting the metal layer at will is taken, the normal induction voltage cannot exceed 300V. When the cable line is long and one end of the cable line is grounded, the cable line is divided into a plurality of appropriate units, the cable terminal is directly grounded, the insulation joints are crossed and interconnected and grounded through the protector, and the straight joint is directly grounded. Fig. 6 is a schematic diagram of a three-port cross-connection of a cable and a schematic diagram of a current sensor installation arrangement in a grounding box according to an embodiment of the present invention, as shown in fig. 6, when the cable is divided into 3 subsections (1 unit), each subsection is A, B, C phases respectively, a metal sheath at a cable terminal is grounded through a direct grounding box, a metal sheath at a joint is connected to a junction box through a coaxial cable, and a metal sheath cross-connection transposition is completed in the junction box.
For the situation of fig. 6, the calculation method of the leakage current between each section is shown as the following formula four, and the cable a is giveniLeakage current of phase, BiLeakage current of phase, CiThe leakage currents of the phases differ from each other by a vector difference (i ═ 1, 2, 3).
When the insulation is normal, leakage current IAi、IBi、ICiThe (i ═ 1, 2, 3) is still symmetrical after passing through a symmetrical impedance, so that the vector sum is 0, as shown in the following equation five.
According to the two formulas, a calculation formula of the leakage current of each subsection cable can be obtained, and the calculation formula is shown as the following formula six.
The magnitude of the leakage current of each subsection of the cable can be derived from the above equation by taking measurements from six current transformers mounted at the two ends of each subsection of the cable.
(5) The section of waiting to detect at the cable is divided into three subsections, and every subsection includes A respectively, B, C three-phase, and the section terminal department metal sheath that waits to detect of cable is through direct grounding box ground connection, and joint department metal sheath is connected to the connecting box through coaxial cable and accomplishes the condition that metal sheath alternately interconnects the transposition in the connecting box, according to the earth connection electric current that obtains, confirms that the section leakage current value that waits to detect of cable includes: and obtaining the current value of the grounding wire at two ends of any phase of any subsection, and determining the leakage current value of the phase of the subsection according to the current values of the grounding wires at two ends of the phase of the subsection. When the cable is divided into 3 subsections (1 unit), each subsection is A, B, C phases respectively, the metal sheath at the cable terminal is grounded through a direct grounding box, the metal sheath at the joint is connected to a six-port connecting box through a coaxial cable and the metal sheath cross-connection transposition is completed in the connecting box, and the metal sheath cross-connection transposition is realized by installing the metal sheath in the cable AiPhase, BiPhase, CiFrom the measurements taken by the two current transformers at the two ends of the phase (i ═ 1, 2, 3), cable a can be deducediPhase, BiPhase, CiMagnitude of phase (i ═ 1, 2, 3) leakage current. The following description is made with reference to the drawings.
When the cable is divided into 3 subsections (1 unit), each subsection is A, B, C phases respectively, the metal sheath at the cable terminal is grounded through a direct grounding box, the metal sheath at the joint is connected to a six-port connecting box through a coaxial cable, and the metal sheath cross-connection transposition is completed in the connecting box. Fig. 7 is a schematic diagram of a six-port cross-connect and current sensor mounting arrangement in a grounded tank according to an embodiment of the invention, and the leakage current is calculated for each subsection as shown in fig. 7 by the following equation seven.
By mounting on cable AiPhase, BiPhase, CiTwo current transformers at two ends of phase (i ═ 1, 2, 3)The obtained measured value can be used for deducing cable AiPhase, BiPhase, CiMagnitude of phase (i ═ 1, 2, 3) leakage current.
When the cable is divided into 3n sections (n units, n is more than or equal to 2), the cable terminal is directly grounded, the insulation joints are crossed and interconnected and grounded through the protector, and the straight joint is directly grounded. There are three types of units for long-distance cables, and since the measured value of the current transformer directly grounded by the through connector is the vector sum of the circulating currents of the unit sheaths on the two sides and the leakage currents, the leakage currents of the cables directly grounded at the two ends of the box can not be separated. But the leakage current of the cables between the cross-connect boxes can be calculated and the leakage current of the connecting wires at the cable termination junctions can also be calculated.
As an alternative embodiment, a cable leakage current detection apparatus is provided, and fig. 8 is a block diagram of a cable leakage current detection apparatus provided according to an embodiment of the present invention, as shown in fig. 8, the apparatus includes: an acquisition module 82 and a determination module 84, which are described below.
The acquisition module 82 is used for acquiring the current of the grounding wires at two ends of the section to be detected of the cable; and the determining module 84 is connected to the obtaining module 82 and is used for determining the leakage current value of the section to be detected of the cable according to the obtained grounding wire current.
As an alternative embodiment, a storage medium is further provided, where the storage medium includes a stored program, and the apparatus on which the storage medium is located is controlled to execute any of the above-mentioned cable leakage current detection methods when the program is executed.
As an alternative embodiment, a processor is further provided, and the processor is configured to execute a program, where the program executes any one of the above-mentioned cable leakage current detection methods when running.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method of detecting cable leakage current, comprising:
acquiring the current of a grounding wire at two ends of a section to be detected of the cable;
and determining the leakage current value of the section to be detected of the cable according to the obtained current of the grounding wire.
2. Method according to claim 1, characterized in that, in the case of direct grounding of the metallic sheaths at the two ends of the section of cable to be detected,
the earth connection electric current that obtains the cable and wait to detect the section both ends includes: acquiring the current of the grounding wire of any phase at two ends of the section to be detected of the cable;
according to the obtained current of the grounding wire, the step of determining the leakage current value of the section to be detected of the cable comprises the following steps: and subtracting the obtained current of the ground wire connected with the two ends of the section to be detected of the cable to obtain the phase leakage current value in the section to be detected of the cable.
3. The method as claimed in claim 1, wherein the determining the leakage current value of the section to be detected of the cable according to the obtained ground line current under the condition that one end of the section to be detected of the cable is directly grounded and the other end is grounded through a protector comprises:
and determining the current of the grounding wire on the direct grounding wire as the leakage current value of the section to be detected of the cable.
4. The method as claimed in claim 1, wherein the determining the leakage current value of the section to be detected of the cable according to the obtained ground line current in the case that the through connector is directly grounded at the middle position of the section to be detected of the cable comprises:
and determining the current of the grounding wire on the direct grounding wire of which the middle part is provided with the direct-through connector and is directly grounded as the leakage current value of the section to be detected of the cable.
5. The method as claimed in claim 1, wherein in the case that the section to be detected of the cable is divided into three subsections, the metal sheath at the terminal of the section to be detected of the cable is grounded through a direct grounding box, the metal sheath at the joint is connected to a connecting box through a coaxial cable, and the metal sheath cross-interconnection transposition is completed in the connecting box, the determining of the leakage current value of the section to be detected of the cable according to the obtained grounding wire current comprises:
and obtaining the current of the grounding wire at two ends of any subsection in the three subsections, and determining the leakage current value of the subsection according to the current of the grounding wire at two ends of the subsection.
6. The method according to claim 1, wherein in the case that the section to be detected of the cable is divided into three subsections, each subsection includes three phases of a, B and C, the metal sheath at the terminal of the section to be detected of the cable is grounded through a direct grounding box, the metal sheath at the joint is connected to a connection box through a coaxial cable, and the metal sheath cross interconnection transposition is completed in the connection box, the determining of the leakage current value of the section to be detected of the cable according to the obtained current of the grounding wire comprises:
and obtaining the current value of the grounding wire at two ends of any phase of any subsection, and determining the leakage current value of the phase of the subsection according to the current values of the grounding wires at two ends of the phase of the subsection.
7. The method according to any one of claims 1 to 6, characterized in that the earth line current is taken across the section of the cable to be detected by means of a current transformer.
8. A cable leakage current detection apparatus, comprising:
the acquisition module is used for acquiring the current of the grounding wires at two ends of the section to be detected of the cable;
and the determining module is used for determining the leakage current value of the section to be detected of the cable according to the acquired current of the grounding wire.
9. A storage medium, characterized in that the storage medium includes a stored program, wherein when the program is executed, a device in which the storage medium is located is controlled to execute the cable leakage current detection method according to any one of claims 1 to 7.
10. A processor, characterized in that the processor is configured to run a program, wherein the program is executed to perform the cable leakage current detection method according to any one of claims 1 to 7.
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| CN112946521A (en) * | 2021-02-04 | 2021-06-11 | 重庆景文源智科技有限公司 | Power distribution network cable leakage current online detection method and insulation state monitoring method |
| CN113109662A (en) * | 2021-03-03 | 2021-07-13 | 中国电力科学研究院有限公司 | Method and system for determining relative aging degree of cable based on interphase relative dielectric loss |
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