CN113900039A - Cable on-line monitoring method and device - Google Patents
Cable on-line monitoring method and device Download PDFInfo
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- CN113900039A CN113900039A CN202110961849.5A CN202110961849A CN113900039A CN 113900039 A CN113900039 A CN 113900039A CN 202110961849 A CN202110961849 A CN 202110961849A CN 113900039 A CN113900039 A CN 113900039A
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- 238000004590 computer program Methods 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 8
- 230000006870 function Effects 0.000 description 6
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/03—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
- G01S19/10—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing dedicated supplementary positioning signals
- G01S19/12—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing dedicated supplementary positioning signals wherein the cooperating elements are telecommunication base stations
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/42—Determining position
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention relates to a method and a device for on-line monitoring of a cable, wherein the method for on-line monitoring of the cable comprises the following steps: acquiring a waveform of current in a power supply cable, wherein the amplitude of the waveform is a current value; determining whether a transition exists in the waveform; and when the waveform has transition and the current value of the waveform after the transition is zero, determining that a short-circuit fault exists in the power supply cable, realizing fault monitoring and improving the operation and maintenance efficiency of the power system.
Description
Technical Field
The invention relates to the technical field of power supply cables, in particular to a method and equipment for online monitoring of a cable.
Background
When the power supply cable is in a phase short circuit or grounded, the fault protection of the whole line can be caused, for example, the electric brake is disconnected to stop power supply, and the production loss is caused. However, the location of the fault cannot be located in time, so that a large amount of manpower and material resources are required to be invested to patrol, locate and remove the fault.
Disclosure of Invention
The invention aims to provide a method and equipment for monitoring a cable on line, which are used for monitoring the fault of a power supply cable and improving the operation and maintenance efficiency of a power system.
In order to achieve the purpose, the invention adopts the technical scheme that:
in a first aspect, the present invention provides a method for on-line monitoring of a cable, the method comprising the steps of:
the method comprises the following steps: acquiring a waveform of current in a power supply cable, wherein the amplitude of the waveform is a current value;
step two: determining whether a transition exists in the waveform;
step three: determining that a short circuit fault exists in the power supply cable when a transition exists in the waveform and a current value of the waveform after the transition is zero.
Further, the second step includes:
determining the variation range of the amplitude of the waveform in a preset period;
determining that a transition exists in the waveform when the amplitude of the waveform exceeds the variation range.
Further, the amplitude of the waveform exceeds the variation range, including:
determining the maximum value and the minimum value of the amplitude corresponding to the variation range;
and when the amplitude of the waveform exceeds the maximum value or is smaller than a preset multiple of the minimum value, determining that the amplitude of the waveform exceeds the variation range.
Further, after the second step, the method further comprises:
determining that a transition of the waveform is a normal condition when there is a transition in the waveform and a current value of the waveform after the transition is not zero.
Further, the normal condition includes one of heavy load switching, inrush current or composite brake.
In a second aspect, the present invention further provides an apparatus for on-line monitoring of a cable, the apparatus comprising:
the power supply cable comprises a waveform acquisition module, a power supply module and a control module, wherein the waveform acquisition module is used for acquiring the waveform of current in the power supply cable, and the amplitude of the waveform is a current value;
a transition determination module to determine whether a transition exists in the waveform;
a fault determination module for determining that a short circuit fault exists in the power supply cable when a transition exists in the waveform and a current value of the waveform after the transition is zero.
In a third aspect, the present invention further provides an online cable monitoring unit, installed on a node on a power supply cable, including: a processor and a memory for storing a computer program which, when executed by the processor, implements a method of on-line cable monitoring according to any of the first aspects.
Further, the cable on-line monitoring unit further comprises: a communication module;
the communication module is used for sending fault information to a background terminal when the fault information that the current flowing through the node is in an overcurrent state is monitored;
the communication module is further used for sending the power failure information to the background terminal when the power failure information that the current flowing through the node is zero is monitored.
Further, the cable on-line monitoring unit further comprises: a positioning module;
the positioning module is used for acquiring the geographical position information of the node; the fault information and the power failure information both comprise geographical position information of the corresponding node.
In a fourth aspect, the invention also proposes a storage medium having stored thereon a computer program which, when executed by a processor, implements the method according to any one of the first aspects.
Compared with the prior art, the cable on-line monitoring method and the related equipment provided by the invention have the following advantages:
1. monitoring short-circuit faults, and adopting a current load self-adaptive judgment method based on waveform analysis;
2. the false alarm prevention function comprises false alarm for eliminating the following conditions:
load fluctuation anti-misoperation alarm
Error alarm is prevented in transformer no-load combined floodgate inrush current
Circuit sudden-closing load inrush current anti-error alarm
Switching heavy load anti-error alarm
Switching-on inrush current anti-error alarm during non-fault reclosing
3. The cable-type positioning device is installed on a cable, and positioning and data communication are carried out through a built-in positioning module and a communication module.
Drawings
Fig. 1 is a flowchart of a method for on-line monitoring of a cable according to embodiment 1 of the present invention;
fig. 2 is a waveform diagram of a normal current in a power supply cable according to embodiment 1 of the present invention;
fig. 3 is a waveform diagram of a current corresponding to an overcurrent fault occurring in a power supply cable according to embodiment 1 of the present invention;
fig. 4 is a schematic structural diagram of an apparatus for on-line cable monitoring according to embodiment 2 of the present invention;
fig. 5 is a schematic structural diagram of a cable online monitoring unit according to embodiment 3 of the present invention.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
The embodiment provides a cable online monitoring method which can be used for monitoring short-circuit faults of power supply cables. Furthermore, the method can be applied to a cable on-line monitoring unit, the cable on-line monitoring unit can be a terminal integrated with a micro-computing unit, and the cable on-line monitoring unit can be mounted on a power supply cable, namely, the power supply cable is mounted on the power supply cable, and the short-circuit fault of the power supply cable is directly monitored.
In addition, the cable on-line monitoring unit can also be integrated with a positioning module, a communication module and the like. The positioning module can use a chip compatible with a global satellite positioning system or a Beidou satellite positioning system; the communication module can use chips of 4G, 5G and the like for mobile communication, such as CAT4 or CAT1 chips.
Fig. 1 is a flowchart of a method for on-line monitoring of a cable according to embodiment 1 of the present invention;
fig. 2 is a waveform diagram of a normal current in a power supply cable according to embodiment 1 of the present invention; fig. 3 is a waveform diagram of a current corresponding to an overcurrent fault occurring in a power supply cable according to embodiment 1 of the present invention.
Referring to fig. 1, the method for monitoring a cable online according to this embodiment may include the following steps:
the method comprises the following steps: acquiring the waveform of the current in the power supply cable, wherein the amplitude of the waveform is a current value.
Generally, when a short-circuit fault occurs in a power supply cable, an overcurrent condition is easily caused in the current supply cable, that is, the current value is greatly increased. According to a traditional cable online monitoring method aiming at an overcurrent condition, a fixed threshold value can be set according to the change of a current value, and fault alarm is carried out when the current value exceeds the fixed threshold value.
Referring to fig. 2, the current waveform on the supply cable varies sinusoidally, and the amplitude of the waveform can approximately represent the current load. Further, the amplitude of the waveform on the power supply cable changes due to dynamic switching-in and switching-off of various loads on the power supply cable. Therefore, the traditional cable online monitoring method cannot make effective judgment on the conditions of large-load investment, composite brake, inrush current and the like, and has a high false alarm rate.
In this embodiment, a cable online monitoring method based on waveform analysis is adopted, and the method can be used for monitoring an overcurrent condition caused by a short-circuit fault and the like.
Specifically, the cable on-line monitoring unit is installed in a cable mode, and can monitor the waveform of current on the power supply cable in real time.
Step two: determining whether a transition of the waveform exists.
Referring to fig. 3, when a short-circuit fault occurs in a power supply cable, the amplitude of the current on the waveform acquired by the cable on-line monitoring unit is greatly increased, and the current is multiplied by the current load before the fault occurs. For example, the waveform corresponding to the a region in fig. 3 is a normal waveform that varies sinusoidally, and the waveform corresponding to the B region has a transition, so that it can be determined that there is a possibility of a short-circuit fault at a time point corresponding to the B region.
It should be noted that the waveform transition may also be caused by a large load switching, inrush current, or a composite brake, and therefore, it cannot be determined that the waveform transition corresponds to a short-circuit fault.
In this embodiment, the waveform may be sampled at a high speed, and analyzed to determine whether the waveform characteristics satisfy the transition condition. Specifically, whether the transition condition exists can be determined based on the current amplitude change amplitude under the operation load of the current supply cable. When a waveform has a transition, the waveform can be identified as a suspected waveform having a short-circuit fault.
In one embodiment, the range of variation of the amplitude of the waveform over a predetermined period (e.g., the period of one or more sine waves) may be determined; when the amplitude of the waveform is determined to exceed the variation range, the transition of the waveform is determined to exist.
Specifically, the maximum value and the minimum value of the amplitude corresponding to the variation range can be determined; when the amplitude of the waveform exceeds the maximum value or is smaller than a preset multiple (such as 3 times) of the minimum value, the amplitude of the waveform is determined to exceed the variation range, namely, the condition that the waveform has transition can be determined, and the waveform can be identified as a suspected waveform with a short-circuit fault.
In this embodiment, after the second step is executed, it may be determined whether the current value of the waveform after the transition is zero; and if the current value of the waveform after the transition is zero, executing a third step, otherwise, executing a fourth step.
Generally, in the case of a short-circuit fault, a short-circuit relay protection device is provided in a power supply cable, and is used for stopping power supply in time when a short-circuit fault occurs in a line, so as to prevent a load working on the power supply cable from being damaged due to overload operation caused by continuous overcurrent current.
Therefore, it is possible to determine whether or not the current value of the waveform after the transition is zero, that is, whether or not the power failure state occurs, and to determine whether or not the short-circuit failure has actually occurred.
In this embodiment, when determining whether the current value of the waveform after the transition is zero, the waveform of one or more sine wave periods after the transition may be intercepted as a basis for the determination. Specifically, when the amplitude of the intercepted waveform exists, the current value of the waveform is considered to be not zero, otherwise, the current value of the waveform is zero.
Step three: determining that a short circuit fault exists in the power supply cable when a transition exists in the waveform and a current value of the waveform after the transition is zero.
In this embodiment, when the short-circuit fault is accompanied by a power failure due to a protection measure of the relay protection device, the amplitude of the current flowing through the cable on-line monitoring unit on the power supply cable should become zero.
For example, in fig. 3, the waveform corresponding to the area a is a normal waveform that changes in a sinusoidal manner, the waveform corresponding to the area B transitions, and the current value of the waveform corresponding to the area C is zero, so that it can be determined that the cable online monitoring unit detects an overcurrent fault caused by a short circuit.
Step four: determining that a transition of the waveform is a normal condition when there is a transition in the waveform and a current value of the waveform after the transition is not zero.
In this embodiment, the transition of the waveform is a normal condition, and may include one of heavy load switching, inrush current, or compound brake.
Generally, for the conditions of heavy load switching, inrush current or compound brake, etc., the power failure action cannot occur in one or more sine wave periods (such as 20ms of one cycle) in the waveform obtained by the cable online monitoring unit, so as to eliminate interference. The condition of the transition can be attributed to one of heavy load switching, inrush current, or compound braking.
Therefore, the cable online monitoring method has a false alarm prevention function, and can include false alarms excluding the following conditions:
load fluctuation anti-misoperation alarm
Error alarm is prevented in transformer no-load combined floodgate inrush current
Circuit sudden-closing load inrush current anti-error alarm
Switching heavy load anti-error alarm
Switching-on inrush current anti-error alarm during non-fault reclosing
In addition, in this embodiment, the cable online monitoring method can determine whether a transition occurs, is a waveform-based analysis method, and has an advantage of being adaptive according to a current load.
Example 2
Fig. 4 is a schematic structural diagram of a device for online monitoring a cable according to embodiment 2 of the present invention. Referring to fig. 4, the apparatus for on-line monitoring of a cable may include: a waveform acquisition module 410, a transition determination module 420, and a fault determination module 430.
The waveform obtaining module 410 is configured to obtain a waveform of a current in a power supply cable, where an amplitude of the waveform is a current value;
a transition determination module 420 for determining whether a transition exists in the waveform;
a fault determination module 430 for determining that a short circuit fault exists in the power supply cable when a transition exists in the waveform and a current value of the waveform after the transition is zero.
In this embodiment, the device for online monitoring of a cable has a function of preventing false alarm, which may include false alarm excluding the following situations:
load fluctuation anti-misoperation alarm
Error alarm is prevented in transformer no-load combined floodgate inrush current
Circuit sudden-closing load inrush current anti-error alarm
Switching heavy load anti-error alarm
Switching-on inrush current anti-error alarm during non-fault reclosing
In addition, in this embodiment, the device for online monitoring of the cable can determine whether a transition occurs, and is a waveform-based analysis method, which has an advantage of being adaptive according to a current load.
On the basis of the above technical solution, the transition determining module 420 includes:
the transformation range determining unit is used for determining the variation range of the amplitude of the waveform in a preset period;
and the transition determining unit is used for determining that the waveform has transition when the amplitude of the waveform exceeds the variation range.
On the basis of the above technical solution, the transition determining unit is specifically configured to: determining the maximum value and the minimum value of the amplitude corresponding to the variation range; and when the amplitude of the waveform exceeds the maximum value or is smaller than a preset multiple of the minimum value, determining that the amplitude of the waveform exceeds the variation range.
On the basis of the above technical scheme, the device for monitoring the cable on line further comprises:
a normality determination module for determining that a transition of the waveform is a normal condition when there is a transition in the waveform and a current value of the waveform after the transition is not zero after the determination of whether there is a transition in the waveform.
On the basis of the technical scheme, the normal condition comprises one of heavy load switching, inrush current or composite brake.
Example 3
Fig. 5 is a schematic structural diagram of a cable online monitoring unit according to embodiment 3 of the present invention. Referring to fig. 5, in this embodiment, the cable on-line monitoring unit may be installed on a node on the power supply cable, and includes: a processor and a memory for storing a computer program which, when executed by the processor, implements the method of on-line cable monitoring described above.
On the basis of the above technical solution, the cable online monitoring unit may further include: a communication module;
the communication module is used for sending fault information to a background terminal when the fault information that the current flowing through the node is in an overcurrent state is monitored;
the communication module is further used for sending the power failure information to the background terminal when the power failure information that the current flowing through the node is zero is monitored.
The communication module can use 4G, 5G and other chips for mobile communication, such as CAT4 or CAT1 chips. The background terminal can be a server or an upper computer and is used for carrying out data communication and analysis with the cable online monitoring unit.
On the basis of the technical scheme, the cable on-line monitoring unit can be also provided with a positioning module; the positioning module is used for acquiring the geographic position of the node. The positioning module can use a chip compatible with a global positioning system or a Beidou satellite positioning system. The background terminal can receive the geographical position to determine the position of the node, so that maintenance personnel of the power supply cable can conveniently and quickly reach the position of the node.
On the basis of the technical scheme, the fault information and the power failure information can both comprise the geographical position information of the corresponding node.
Example 4
The present embodiment also provides a storage medium, on which a computer program is stored, which when executed by a processor implements the above-mentioned method for on-line cable monitoring.
Of course, the storage medium provided by the embodiment of the present invention contains computer-executable instructions, and the computer-executable instructions are not limited to the operations of the method for on-line cable monitoring described above, and may also perform related operations in the method for on-line cable monitoring provided by any embodiment of the present invention, and have corresponding functions and advantages.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk, or an optical disk of a computer, and includes several instructions to enable a computer device (which may be a robot, a personal computer, a server, or a network device) to perform the method for on-line cable monitoring according to any embodiment of the present invention.
It should be noted that, in the above device for monitoring a cable online, each unit and each module included in the device are only divided according to functional logic, but are not limited to the above division, as long as the corresponding function can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
Although the invention has been described in detail hereinabove by way of general description, specific embodiments and experiments, it will be apparent to those skilled in the art that many modifications and improvements can be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A method of on-line monitoring of a cable, the method comprising the steps of:
the method comprises the following steps: acquiring a waveform of current in a power supply cable, wherein the amplitude of the waveform is a current value;
step two: determining whether a transition exists in the waveform;
step three: determining that a short circuit fault exists in the power supply cable when a transition exists in the waveform and a current value of the waveform after the transition is zero.
2. The method according to claim 1, wherein the second step comprises:
determining the variation range of the amplitude of the waveform in a preset period;
determining that a transition exists in the waveform when the amplitude of the waveform exceeds the variation range.
3. The method of claim 2, wherein the amplitude of the waveform exceeds the range of variation, comprising:
determining the maximum value and the minimum value of the amplitude corresponding to the variation range;
and when the amplitude of the waveform exceeds the maximum value or is smaller than a preset multiple of the minimum value, determining that the amplitude of the waveform exceeds the variation range.
4. The method of claim 1, further comprising, after step two:
determining that a transition of the waveform is a normal condition when there is a transition in the waveform and a current value of the waveform after the transition is not zero.
5. The method of claim 4, wherein the normal condition comprises one of high load switching, inrush current, or compound braking.
6. An apparatus for on-line monitoring of a cable, the apparatus comprising:
the power supply cable comprises a waveform acquisition module, a power supply module and a control module, wherein the waveform acquisition module is used for acquiring the waveform of current in the power supply cable, and the amplitude of the waveform is a current value;
a transition determination module to determine whether a transition exists in the waveform;
a fault determination module for determining that a short circuit fault exists in the power supply cable when a transition exists in the waveform and a current value of the waveform after the transition is zero.
7. An on-line cable monitoring unit, mounted on a node on a power supply cable, comprising: a processor and a memory for storing a computer program which, when executed by the processor, carries out the method of on-line cable monitoring according to any one of claims 1 to 5.
8. The cable on-line monitoring unit of claim 7, further comprising: a communication module;
the communication module is used for sending fault information to a background terminal when the fault information that the current flowing through the node is in an overcurrent state is monitored;
the communication module is further used for sending the power failure information to the background terminal when the power failure information that the current flowing through the node is zero is monitored.
9. The cable on-line monitoring unit of claim 8, further comprising: a positioning module;
the positioning module is used for acquiring the geographical position information of the node; the fault information and the power failure information both comprise geographical position information of the corresponding node.
10. A storage medium on which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1 to 5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110961849.5A CN113900039A (en) | 2021-08-20 | 2021-08-20 | Cable on-line monitoring method and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110961849.5A CN113900039A (en) | 2021-08-20 | 2021-08-20 | Cable on-line monitoring method and device |
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| CN113900039A true CN113900039A (en) | 2022-01-07 |
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| CN103439625A (en) * | 2013-09-03 | 2013-12-11 | 北京豪锐达科技有限公司 | Cable system fault positioning and load monitoring method |
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| CN110780150A (en) * | 2019-10-21 | 2020-02-11 | 江苏轶一电力科技有限公司 | Transmission line fault positioning device and method based on transmission tower leakage current |
| CN212180940U (en) * | 2020-03-31 | 2020-12-18 | 国网辽宁省电力有限公司朝阳供电公司 | Distribution network looped netowrk cabinet cable run fault positioner |
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2021
- 2021-08-20 CN CN202110961849.5A patent/CN113900039A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103439625A (en) * | 2013-09-03 | 2013-12-11 | 北京豪锐达科技有限公司 | Cable system fault positioning and load monitoring method |
| CN105738775A (en) * | 2016-05-02 | 2016-07-06 | 国家电网公司 | Power distribution network fault analyzing and positioning system and power distribution network fault analyzing and positioning method |
| CN110596534A (en) * | 2019-09-18 | 2019-12-20 | 湖南农业大学 | Fault detection method and system of power internet of things and computer storage medium |
| CN110780150A (en) * | 2019-10-21 | 2020-02-11 | 江苏轶一电力科技有限公司 | Transmission line fault positioning device and method based on transmission tower leakage current |
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Application publication date: 20220107 |