CN111796161A - Fault detection system and fault detection method for overhead cable - Google Patents
Fault detection system and fault detection method for overhead cable Download PDFInfo
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- CN111796161A CN111796161A CN202010464258.2A CN202010464258A CN111796161A CN 111796161 A CN111796161 A CN 111796161A CN 202010464258 A CN202010464258 A CN 202010464258A CN 111796161 A CN111796161 A CN 111796161A
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The invention provides a fault detection system and a fault detection method for an overhead cable. The real-time monitoring of the overhead line can be realized. Thereby ensuring the reliability of detecting the operation of the overhead cable. The invention provides a fault detection system for an overhead cable, which comprises: the system comprises a group of power utilization lines, a group of main overhead cables, a group of branch overhead cables, a group of power monitoring devices and a detection controller. A set of main overhead cables has a set of three-phase main power supply cables. A group of branch overhead cables are connected with the three-phase main power supply cable and the power utilization line. The branch overhead cable has a set of three-phase branch power supply cables connected to a three-phase main power supply cable. The detection controller is provided with a plurality of input ends and a plurality of output ends. And acquiring fault detection result information according to the three-phase induced current and the three-phase induced potential.
Description
Technical Field
The invention relates to the field of power detection and monitoring. In particular to a fault detection system and a fault detection method for an overhead cable.
Background
In a 35KV overhead line power supply system, due to different neutral point connection modes, when a line disconnection fault occurs, the influence on power supply of a power utilization unit is different. When the neutral point adopts the low resistance ground connection, when single-phase ground connection takes place, line equipment can break fast and protect. When the neutral point adopts a low-current grounding system or a broken line grounding fault occurs, the line can still continue to supply power within a set time range, and the power supply state of the circuit cannot be obtained in time, so that the production safety problem is solved.
Disclosure of Invention
The invention aims to provide a fault detection system and a fault detection method for an overhead cable. The real-time monitoring of the overhead line can be realized. Thereby ensuring the reliability of detecting the operation of the overhead cable.
The invention provides a fault detection system for an overhead cable, which comprises: the system comprises a group of power utilization lines, a group of main overhead cables, a group of branch overhead cables, a group of power monitoring devices and a detection controller.
A set of main overhead cables has a set of three-phase main power supply cables. A group of branch overhead cables are connected with the three-phase main power supply cable and the power utilization line. The branch overhead cable has a set of three-phase branch power supply cables. The three-phase branch power supply cable is respectively connected with the three-phase main power supply cable.
A group of power monitoring devices includes three power monitoring devices. The three power monitoring devices are respectively arranged on the three-phase branch power supply cable and can collect the current three-phase induced current i of the three-phase branch power supply cableA、iBAnd iCAnd three-phase induced potential eA、eB、eC. The power monitoring equipment can output three-phase induction current i through an output lineA、iB、iCAnd three-phase induced potential eA、eB、eC。
The detection controller is provided with a plurality of input ends and a plurality of output ends. The input end of the three-phase induction current I is respectively connected with the output lines of the three power monitoring devices and can receive the three-phase induction current iA、iB、iCAnd three-phase induced potential eA、eB、eC. The detection controller is used for detecting the three-phase induction current iA、iB、iCAnd three-phase induced potential eA、eB、eCAnd acquiring fault detection result information.
In another embodiment of the invention, the detection controller respectively collects the first time three-phase induced current i according to a set interval timeA1、iB1、iC1And a first time three-phase induced potential eA1、eB1、eC1. And a firstTwo-time three-phase induced current iA2、iB2、iC2And a second time three-phase induced potential eA2、eB2、eC2。
Three-phase induction current i according to first timeA1、iB1、iC1And a first time three-phase induced potential eA1、eB1、eC1And a second time three-phase induced current iA2、iB2、iC2And a second time three-phase induced potential eA2、eB2、eC2Obtaining single point detection gradient according to equation 1
Judgment of
If the threshold value is larger than a set single-point threshold value, fault information is sent out.
In still another embodiment of the present invention, the method further comprises: a wireless communication module and three GPS modules. The wireless communication module is arranged on the detection controller and can be in wireless two-way communication with the power monitoring device. The output ends of the three GPS modules are respectively connected with controllers of three electric power monitoring devices of the electric power monitoring device and can provide time for the three electric power monitoring devices; and the control ends of the three GPS modules are wirelessly connected with the detection controller through the wireless communication module.
The detection controller sets a first detection time and a second detection time by setting the interval time. The detection controller obtains a first-time three-phase induction current i through the wireless communication module at a first detection timeA1、iB1、iC1And a first time three-phase induced potential eA1、eB1、eC1. And simultaneously, acquiring three-phase first acquisition time from the three GPS modules through the wireless communication module. The detection controller detects the second detection timeAcquiring a second time three-phase induction current i through the wireless communication moduleA2、iB2、iC2And a second time three-phase induced potential eA2、eB2、eC2. And simultaneously, acquiring three-phase second acquisition time from the three GPS modules through the wireless communication module.
The detection controller acquires the acquisition interval time according to the first acquisition time and the second acquisition time. Judging whether the collection interval time is the set interval time, if not, respectively collecting the first time three-phase induced current i by the detection controller through the set interval time againA1、iB1、iC1And a first time three-phase induced potential eA1、eB1、eC1. And a second time three-phase induced current iA2、iB2、iC2And a second time three-phase induced potential eA2、eB2、eC2. And meanwhile, the detection controller sends a single-point acquisition abnormity prompt message.
In yet another embodiment of the present invention, the power monitoring devices are configured as a first group of power monitoring devices and a second group of power monitoring devices.
Three power monitoring devices in the first group of power monitoring devices are respectively arranged at a first position of the three-phase branch power supply cable. The first position is a position near where the three-phase branch power supply cable is connected with the three-phase main power supply cable. Three power monitoring devices in the first group of power monitoring devices can collect a first group of three-phase induced currents i of the three-phase branch power supply cable at a first positionSA、iSB、iSCAnd a first set of three-phase induced potentials eSA、eSB、eSC。
And three power monitoring devices in the second group of power monitoring devices are respectively arranged at a second position of the three-phase branch power supply cable. The second position is a position close to the connection of the three-phase branch power supply cable and the power line. Three power monitoring devices in the second group of power monitoring devices can collect a second group of three-phase induced currents i of the three-phase branch power supply cable at a second positionEA、iEB、iECAnd a first group of three-phase inductorsResponse potential eEA、eEB、eEC。
The detection controller acquires a current first group of three-phase induction current i from a first group of power monitoring equipment according to a multi-point acquisition timeSA、iSB、iSCAnd a first set of three-phase induced potentials eSA、eSB、eSCAnd a second set of three-phase induced currents iEA、iEB、iECAnd a first set of three-phase induced potentials eEA、eEB、eEC。
According to the first three-phase induction current iSA、iSB、iSCAnd a first set of three-phase induced potentials eSA、eSB、eSCAnd a second set of three-phase induced currents iEA、iEB、iECAnd a first set of three-phase induced potentials eEA、eEB、eECObtaining a multi-point detection gradient +B 2 by equation 2:
judgment of
If the threshold value is larger than a set multipoint threshold value, fault information is sent out.
In still another embodiment of the present invention, the method further includes: the GPS time service system comprises a first group of wireless communication modules, a second group of wireless communication modules, a first group of GPS time service modules and a second group of GPS time service modules.
The first group of wireless communication modules are respectively arranged on the three power monitoring devices in the first group of power monitoring devices and can enable the three power monitoring devices in the first group of power monitoring devices to wirelessly and bidirectionally communicate with the detection controller. And the second group of wireless communication modules are respectively arranged on the three power monitoring devices in the second group of power monitoring devices and can enable the three power monitoring devices in the second group of power monitoring devices to wirelessly and bidirectionally communicate with the detection controller.
And the first group of GPS time service modules are connected with the three power monitoring devices in the first group of power monitoring devices and can provide time for the three power monitoring devices in the first group of power monitoring devices. And the second group of GPS time service modules are connected with the three power monitoring devices in the second group of power monitoring devices and can provide time to the three power monitoring devices in the second group of power monitoring devices.
In another embodiment of the present invention, the detection controller obtains the current first three-phase induced current iSA、iSB、iSCAnd a first set of three-phase induced potentials eSA、eSB、eSCA first set of acquisition times is acquired. The detection controller acquires the current second three-phase induction current iEA、iEB、iECAnd a first set of three-phase induced potentials eEA、eEB、eECA second set of acquisition times is acquired.
The output end of the detection controller is connected with the driving ends of the first group of GPS time service modules and the second group of GPS time service modules. The detection controller determines whether the first acquisition time matches the second set of acquisition times. If not, the detection controller sends the first group of GPS time service instructions and the second group of GPS time service instructions to the output end.
The first group of GPS time service modules provide time to three electric power monitoring devices in the first group of electric power monitoring devices according to the first group of GPS time service instructions. And the second group of GPS time service modules provide time to three power monitoring devices in the second group of power monitoring devices according to the second group of GPS time service instructions.
The invention also provides a fault detection method of the overhead cable, which is realized by the fault detection system of the overhead cable.
A fault detection system for an overhead cable includes: the power utilization system comprises a group of power utilization lines, a group of main overhead cables, a group of branch overhead cables and a group of power monitoring devices.
A set of main overhead cables has a set of three-phase main power supply cables. A group of branch overhead cables are connected with the three-phase main power supply cable and the power utilization line. The branch overhead cable has a set of three-phase branch power supply cables. The three-phase branch power supply cable is respectively connected with the three-phase main power supply cable.
A group of power monitoring devices includes three power monitoring devices. The three power monitoring devices are respectively arranged on the three-phase branch power supply cable and can collect the current three-phase induced current i of the three-phase branch power supply cableA、iBAnd iCAnd three-phase induced potential eA、eB、eC. The power monitoring equipment can output three-phase induction current i through an output lineA、iB、iCAnd three-phase induced potential eA、eB、eC。
The fault detection method of the overhead cable comprises the following steps: according to three-phase induced current iA、iB、iCAnd three-phase induced potential eA、eB、eCAnd acquiring fault detection result information.
In yet another embodiment of the present invention, a method of fault detection of an overhead cable further comprises:
respectively collecting first time three-phase induction current i according to a set interval timeA1、iB1、iC1And a first time three-phase induced potential eA1、eB1、eC1. And a second time three-phase induced current iA2、iB2、iC2And a second time three-phase induced potential eA2、eB2、eC2。
Three-phase induction current i according to first timeA1、iB1、iC1And a first time three-phase induced potential eA1、eB1、eC1And a second time three-phase induced current iA2、iB2、iC2And a second time three-phase induced potential eA2、eB2、eC2Obtaining single point detection gradient according to equation 3
Judgment of
If the threshold value is larger than a set single-point threshold value, fault information is sent out.
In yet another embodiment of the present invention, the power monitoring devices are configured as a first group of power monitoring devices and a second group of power monitoring devices.
Three power monitoring devices in the first group of power monitoring devices are respectively arranged at a first position of the three-phase branch power supply cable. The first position is a position near where the three-phase branch power supply cable is connected with the three-phase main power supply cable. Three power monitoring devices in the first group of power monitoring devices can collect a first group of three-phase induced currents i of the three-phase branch power supply cable at a first positionSA、iSB、iSCAnd a first set of three-phase induced potentials eSA、eSB、eSC。
And three power monitoring devices in the second group of power monitoring devices are respectively arranged at a second position of the three-phase branch power supply cable. The second position is a position close to the connection of the three-phase branch power supply cable and the power line. Three power monitoring devices in the second group of power monitoring devices can collect a second group of three-phase induced currents i of the three-phase branch power supply cable at a second positionEA、iEB、iECAnd a first set of three-phase induced potentials eEA、eEB、eEC。
The fault detection method of the overhead cable further comprises the following steps:
acquiring a current first three-phase induction current i from a first group of power monitoring equipment according to a multi-point acquisition timeSA、iSB、iSCAnd a first set of three-phase induced potentials eSA、eSB、eSCAnd a second set of three-phase induced currents iEA、iEB、iECAnd a first set of three-phase induced potentials eEA、eEB、eEC。
According to the first three-phase induction current iSA、iSB、iSCAnd a first set of three-phase inductorsPotential eSA、eSB、eSCAnd a second set of three-phase induced currents iEA、iEB、iECAnd a first set of three-phase induced potentials eEA、eEB、eECObtaining a Multi-Point detection gradient by equation 4
Judgment of
If the threshold value is larger than a set multipoint threshold value, fault information is sent out.
In still another embodiment of the present invention, the fault detection system of the overhead cable further includes: the GPS time service system comprises a first group of GPS time service modules and a second group of GPS time service modules.
The fault detection method of the overhead cable further comprises the following steps:
obtaining a current first set of three-phase induced currents iSA、iSB、iSCAnd a first set of three-phase induced potentials eSA、eSB、eSCA first set of acquisition times is acquired. The detection controller acquires the current second three-phase induction current iEA、iEB、iECAnd a first set of three-phase induced potentials eEA、eEB、eECA second set of acquisition times is acquired.
And judging whether the first acquisition time is matched with the second group of acquisition time. If not, the detection controller sends the first group of GPS time service instructions and the second group of GPS time service instructions to the output end.
The first group of GPS time service modules provide time to three electric power monitoring devices in the first group of electric power monitoring devices according to the first group of GPS time service instructions.
And the second group of GPS time service modules provide time to three power monitoring devices in the second group of power monitoring devices according to the second group of GPS time service instructions.
The above features, technical features, advantages and modes of achieving them will be further described in a clear and understandable manner by referring to the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram for explaining a fault detection system for an overhead cable according to an embodiment of the present invention.
Fig. 2 is a schematic diagram for explaining a configuration of a detection controller according to an embodiment of the present invention.
Fig. 3 is a schematic diagram for explaining a fault detection system of an overhead cable according to another embodiment of the present invention.
Fig. 4 is a schematic diagram for explaining a fault detection system of an overhead cable according to still another embodiment of the present invention.
FIG. 5 is a schematic diagram illustrating a fault detection system for an overhead cable according to still another embodiment of the present invention
Detailed Description
In order to more clearly understand the technical features, objects and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings, in which the same reference numerals indicate the same or structurally similar but functionally identical elements.
"exemplary" means "serving as an example, instance, or illustration" herein, and any illustration, embodiment, or steps described as "exemplary" herein should not be construed as a preferred or advantageous alternative. For the sake of simplicity, the drawings only schematically show the parts relevant to the present exemplary embodiment, and they do not represent the actual structure and the true scale of the product.
As shown in fig. 1, the present invention provides a fault detection system for an overhead cable comprising: a group of power lines 30, a group of main overhead cables 10, a group of branch overhead cables 20, a group of power monitoring devices, and a detection controller 50.
As shown in fig. 1, a set of main overhead cables 10 has a set of three-phase main power supply cables 11, 12, 13. A set of branch overhead cables 20 connects the three-phase main power supply cables 11, 12, 13 with the power-using line 30. The branch overhead cable 20 has a set of three-phase branch power supply cables 21, 22, 23. Three-phase branch power supply cables 21, 22, and 23 are connected to three-phase main power supply cables 11, 12, and 13, respectively, and three-phase main power supply cables 11, 12, and 13 can supply power to three-phase branch power supply cables 21, 22, and 23.
As shown in fig. 1, a group of power monitoring devices comprises three power monitoring devices 41, 42, 43. The three power monitoring devices 41, 42, 43 are respectively disposed on the three-phase branch power supply cables 21, 22, 23 and can collect the current three-phase induced current i of the three-phase branch power supply cables 21, 22, 23A、iBAnd iCAnd three-phase induced potential eA、eB、eC. The power monitoring devices 41, 42, 43 are capable of outputting a three-phase induced current i through the output linesA、iB、iCAnd three-phase induced potential eA、eB、eC。
As shown in fig. 2, the detection controller 50 has a plurality of input terminals 51 and a plurality of output terminals 52. The input terminals 51 are respectively connected with the output lines of the three power monitoring devices 41, 42 and 43 and can receive the three-phase induction current iA、iB、iCAnd three-phase induced potential eA、eB、eC. The detection controller 50 detects the three-phase induced current iA、iB、iCAnd three-phase induced potential eA、eB、eCAnd acquiring fault detection result information.
According to the invention, the induced current detection device is arranged on the three-phase branch power supply cable, so that the current three-phase induced current and the current three-phase induced potential in the three-phase branch power supply cable are obtained. And judging the power supply condition of the three-phase branch power supply cable according to the current three-phase induced current and the change of the three-phase induced potential in the three-phase branch power supply cable. Therefore, the power supply condition of the three-phase branch power supply cable can be monitored in real time, and the safety and reliability of the operation of the circuit are ensured.
In another embodiment of the fault detection system for an overhead cable of the present invention, the detection controller 50 respectively collects the first time three-phase induced currents according to a set interval timeiA1、iB1、iC1And a first time three-phase induced potential eA1、eB1、eC1. And a second time three-phase induced current iA2、iB2、iC2And a second time three-phase induced potential eA2、eB2、eC2. The set interval time is 1s to 2 s.
Three-phase induction current i according to first timeA1、iB1、iC1And a first time three-phase induced potential eA1、eB1、eC1And a second time three-phase induced current iA2、iB2、iC2And a second time three-phase induced potential eA2、eB2、eC2Obtaining single point detection gradient according to equation 1
Judgment of
If the threshold value is larger than a set single-point threshold value, fault information is sent out. Normally, the gradient is detected if a single point is detected
Approximately 0, when either disconnected or grounded, a maximum sudden change in ^ B results, i.e., a one-point detection gradient
Greater than a set single point threshold.
Thus, by providing the power monitoring devices 41, 42, 43 at one fixed position of the set of three-phase branch power supply cables 21, 22, 23, the induced currents in the three-phase branch power supply cables 21, 22, 23 are respectively collected at two collection times (one interval time). By collecting the induced currents in the three-phase branch power supply cables 21, 22 and 23 twice and comparing the results of the two collections, whether the current working state of the three-phase branch power supply cables 21, 22 and 23 is a normal state or not is judged.
As shown in fig. 3, in another embodiment of the fault detection system for an overhead cable according to the present invention, the fault detection system further includes: one wireless communication module 60 and three GPS modules 71, 72, 73. The wireless communication module 60 is provided in the detection controller 50 and is capable of wireless bidirectional communication with the power monitoring devices 41, 42, 43. The output ends of the three GPS modules 71, 72, 73 are connected to controllers of the three power monitoring devices 41, 42, 43 of the power monitoring apparatus, respectively, and the three GPS modules 71, 72, 73 can give time to the three power monitoring devices 41, 42, 43. The control terminals of the three GPS modules 71, 72, 73 are wirelessly connected to the detection controller 50 through the wireless communication module 60.
Therefore, the detection data can be acquired in real time, and the real-time performance of acquiring the monitoring data and the monitoring accuracy are improved.
The detection controller 50 sets the first detection time and the second detection time by setting the interval time (e.g., 1s to 2 s). The detection controller 50 obtains a first-time three-phase induction current i through the wireless communication module at a first detection timeA1、iB1、iC1And a first time three-phase induced potential eA1、eB1、eC1. And simultaneously, acquiring three-phase first acquisition time from the three GPS modules through the wireless communication module. The detection controller 50 obtains the three-phase induced current i at the second time through the wireless communication module at the second detection timeA2、iB2、iC2And a second time three-phase induced potential eA2、eB2、eC2. And simultaneously, acquiring three-phase second acquisition time from the three GPS modules through the wireless communication module.
The detection controller 50 acquires the acquisition interval time according to the first acquisition time and the second acquisition time. Judging whether the collection interval time is the set interval time, if not, the detection controller 50 respectively collects the first time three-phase induced current i again through the set interval timeA1、iB1、iC1And a first time three-phase induced potential eA1、eB1、eC1. And a second timeThree-phase induced current iA2、iB2、iC2And a second time three-phase induced potential eA2、eB2、eC2. Meanwhile, the detection controller 50 sends a single-point acquisition abnormality prompt message.
In yet another embodiment of the overhead cable fault detection system of the present invention, as shown in fig. 4, the power monitoring devices are provided as a first group of power monitoring devices 61 and a second group of power monitoring devices 62.
As shown in fig. 4, three power monitoring devices 64, 65, and 66 in the first group of power monitoring apparatuses 61 are respectively provided at one first position 91 of the three-phase branch power supply cables 21, 22, and 23. The first position 91 is a position near where the three-phase branch power supply cables 21, 22, 23 are connected to the three-phase main power supply cables 11, 12, 13.
As shown in FIG. 4, the three power monitoring devices 64, 65, and 66 in the first set of power monitoring apparatus 61 are capable of collecting a first set of three-phase induced currents i of the three-phase branch power supply cables 21, 22, 23 at a first location 91SA、iSB、iSCAnd a first set of three-phase induced potentials eSA、eSB、eSC。
As shown in fig. 4, three power monitoring devices 67, 68, and 69 of the second group of power monitoring apparatuses 62 are respectively provided at one second position 92 of the three-phase branch power supply cables 21, 22, 23. The second position 92 is a position near the connection of the three-phase branch power supply cables 21, 22, 23 with the power using line 30. Three power monitoring devices of the second group of power monitoring devices are capable of acquiring a second group of three-phase induced currents i of the three-phase branch supply cables 21, 22, 23 in a second position 92EA、iEB、iECAnd a first set of three-phase induced potentials eEA、eEB、eEC。
As shown in FIG. 4, the detection controller 50 obtains a current first set of three-phase induced currents i from a first set of power monitoring devices according to a multi-point acquisition timeSA、iSB、iSCAnd a first set of three-phase induced potentials eSA、eSB、eSCAnd a second set of three-phase induced currents iEA、iEB、iECAnd a first set of three-phase induced potentials eEA、eEB、eEC。
According to the first three-phase induction current iSA、iSB、iSCAnd a first set of three-phase induced potentials eSA、eSB、eSCAnd a second set of three-phase induced currents iEA、iEB、iECAnd a first set of three-phase induced potentials eEA、eEB、eECObtaining a Multi-Point detection gradient by equation 2
Judgment of
If the threshold value is larger than a set multipoint threshold value, fault information is sent out.
In one embodiment of the present invention, the method implemented by the fault detection system for an overhead cable in the present invention can be implemented by a three-phase synchronous measurement gradient method.
Aiming at the single-phase disconnection of the overhead insulated power conductor, a disconnection head-tail gradient method is adopted to solve the problem. By installing at least two sets of monitoring systems at the wire branch and at the end. If the branch position reports a fault, an alarm is displayed to the front end, and if the tail end reports a fault, an alarm is displayed to the rear end.
Binary vectors Bs (Es (t), is (t)) and Be (Ee (t) and ie (t)) are respectively used for representing the electric field and the current value synchronously monitored at the branch and the tail end. Definition of
▽B＝(Es(t)-Ee(t))i+(Is(t)-Ie(t))j
Is a head-tail electric field current composite gradient formula. Setting:
then the composite head-to-tail gradient of the current of the electric field is constructed as follows: see the formula 5.1-5.3
Normally, B is approximately 0, with a large jump resulting when a line is broken or grounded.
Let alarm formula 5.4 be:
ΔE2+ΔI2≥α (54)
alpha is an alarm threshold value. Wherein the content of the first and second substances,
ΔE2＝(esA(t)-eeA(t))2+(esB(t)-eeB(t))2+(esC(t)-eeC(t))2
ΔI2＝(isA(t)-ieA(t))2+(isB(t)-ieB(t))2+(isC(t)-ieC(t))2
the three-phase synchronous measurement of the electric field and the current value at a single monitoring point can be constructed to be separated by 1 minute, and the disconnection fault of the single-phase earth fault can be inspected by adopting the synchronous gradient and the historical gradient change. If a certain phase current is measured to be 0 synchronously, other two phases are not zero. Considering the ground electric field, the zero phase is the broken line phase.
The process of judging broken line or single-phase grounding is as follows:
1.1, installing two sets of monitoring equipment from head to tail.
And 1.2, synchronizing the two sets of data acquisition terminals by adopting a synchronization mode to acquire current and electric field data.
1.3, the synchronization technology can be synchronously realized by adopting a GPS time service module.
1.4, calculating the second-order modulus of the formula (3).
1.5、ΔE2+ΔI2And if the alpha is larger than or equal to the alpha, judging that the line is broken or the ground fault occurs.
1.6、ΔE2+ΔI2If alpha is less than alpha, judging that no disconnection or grounding fault occurs.
1.7 Return to (2).
As shown in fig. 5, in still another embodiment of the present invention, the method further includes: a first group of wireless communication modules 74, 75 and 76, a second group of wireless communication modules 77, 78 and 79, a first group of GPS time service modules 81 and a second group of GPS time service modules 82.
As shown in fig. 5, a first group of wireless communication modules 74, 75, and 76, which are respectively provided to the three power monitoring devices 64, 65, and 66 in the first group of power monitoring apparatuses 61 and enable the three power monitoring devices 64, 65, and 66 in the first group of power monitoring apparatuses 61 to wirelessly communicate with the detection controller 50 in a bidirectional manner. The second group of wireless communication modules 77, 78, and 79 are provided to the three power monitoring devices 67, 68, and 69 in the second group of power monitoring apparatuses, respectively, and enable the three power monitoring devices 67, 68, and 69 in the second group of power monitoring apparatuses to wirelessly communicate bidirectionally with the detection controller 50.
As shown in FIG. 5, the first set of GPS timing module 81 is coupled to the three power monitoring devices 67, 68, and 69 of the first set of power monitoring devices 61 and is capable of timing the three power monitoring devices 67, 68, and 69 of the first set of power monitoring devices 61. And a second group GPS time service module 82 which is connected with the three power monitoring devices 67, 68 and 69 in the second group of power monitoring devices and can provide time to the three power monitoring devices 67, 68 and 69 in the second group of power monitoring devices.
In yet another embodiment of the present invention, the detection controller 50 obtains the current first three-phase induced current iSA、iSB、iSCAnd a first set of three-phase induced potentials eSA、eSB、eSCA first set of acquisition times is acquired. The detection controller 50 acquires the current second three-phase induction current iEA、iEB、iECAnd a first set of three-phase induced potentials eEA、eEB、eECA second set of acquisition times is acquired.
The output end 52 of the detection controller 50 is connected with the driving ends of the first group of GPS time service modules 81 and the second group of GPS time service modules 82. The detection controller 50 determines whether the first acquisition time matches the second set of acquisition times. If not, the detection controller 50 sends the first group of GPS time service instructions and the second group of GPS time service instructions to the output end 52.
The first group GPS time service module 81 provides time to three power monitoring devices in the first group power monitoring device 61 according to the first group GPS time service instruction. The second group GPS time service module 82 is used for supplying time to the three power monitoring devices 67, 68 and 69 in the second group of power monitoring devices according to the second group GPS time service instruction.
The invention also provides a fault detection method of the overhead cable, which is realized by the fault detection system of the overhead cable.
A fault detection system for an overhead cable includes: a set of power lines 30, a set of main overhead cables 10, a set of branch overhead cables 20, and a set of power monitoring devices.
A set of main overhead cables 10 has a set of three-phase main power supply cables 11, 12, 13. A set of branch overhead cables 20 connects the three-phase main power supply cables 11, 12, 13 with the power-using line 30. The branch overhead cable 20 has a set of three-phase branch power supply cables 21, 22, 23. Three-phase branch power supply cables 21, 22, and 23 are connected to three-phase main power supply cables 11, 12, and 13, respectively.
A group of power monitoring devices includes three power monitoring devices. The three power monitoring devices are respectively arranged on the three-phase branch power supply cables 21, 22 and 23 and can collect current three-phase induced currents i of the three-phase branch power supply cables 21, 22 and 23A、iBAnd iCAnd three-phase induced potential eA、eB、eC. The power monitoring equipment can output three-phase induction current i through an output lineA、iB、iCAnd three-phase induced potential eA、eB、eC。
The fault detection method of the overhead cable comprises the following steps: according to three-phase induced current iA、iB、iCAnd three-phase induced potential eA、eB、eCAnd acquiring fault detection result information.
In yet another embodiment of the present invention, a method of fault detection of an overhead cable further comprises:
respectively collecting first time three-phase induction current i according to a set interval timeA1、iB1、iC1And a first time three-phase induced potential eA1、eB1、eC1. And a second time three-phase induced current iA2、iB2、iC2And a second time three-phase induced potential eA2、eB2、eC2。
Three-phase induction current i according to first timeA1、iB1、iC1And a first time three-phase induced potential eA1、eB1、eC1And a second time three-phase induced current iA2、iB2、iC2And a second time three-phase induced potential eA2、eB2、eC2Obtaining single point detection gradient according to equation 3
Judgment of
If the threshold value is larger than a set single-point threshold value, fault information is sent out.
In yet another embodiment of the present invention, the power monitoring devices are configured as a first group of power monitoring devices 61 and a second group of power monitoring devices 62.
Three power monitoring devices of the first group of power monitoring apparatuses 61 are respectively arranged at one first position 91 of the three-phase branch power supply cables 21, 22, 23. The first position 91 is a position near where the three-phase branch power supply cables 21, 22, 23 are connected to the three-phase main power supply cables 11, 12, 13. Three power monitoring devices in the first group of power monitoring apparatuses 61 are capable of acquiring a first group of three-phase induced currents i of the three-phase branch power supply cables 21, 22, 23 at a first position 91SA、iSB、iSCAnd a first set of three-phase induced potentials eSA、eSB、eSC。
Three power monitoring devices 67, 68 and 69 of the second group of power monitoring apparatuses are respectively provided at one second position 92 of the three-phase branch power supply cables 21, 22, 23. The second position 92 is a position near the connection of the three-phase branch power supply cables 21, 22, 23 with the power using line 30. The three power monitoring devices 67, 68 and 69 of the second set of power monitoring apparatuses are capable of collecting a second set of three-phase induced currents i of the three-phase branch supply cables 21, 22, 23 in a second position 92EA、iEB、iECAnd a first set of three-phase induced potentials eEA、eEB、eEC。
The fault detection method of the overhead cable further comprises the following steps:
acquiring a current first three-phase induction current i from a first group of power monitoring equipment according to a multi-point acquisition timeSA、iSB、iSCAnd a first set of three-phase induced potentials eSA、eSB、eSCAnd a second set of three-phase induced currents iEA、iEB、iECAnd a first set of three-phase induced potentials eEA、eEB、eEC。
According to the first three-phase induction current iSA、iSB、iSCAnd a first set of three-phase induced potentials eSA、eSB、eSCAnd a second set of three-phase induced currents iEA、iEB、iECAnd a first set of three-phase induced potentials eEA、eEB、eECObtaining a Multi-Point detection gradient by equation 4
Judgment of
If the threshold value is larger than a set multipoint threshold value, fault information is sent out.
In still another embodiment of the present invention, the fault detection system of the overhead cable further includes: a first group of GPS time service modules 81 and a second group of GPS time service modules 82.
The fault detection method of the overhead cable further comprises the following steps:
obtaining a current first set of three-phase induced currents iSA、iSB、iSCAnd a first set of three-phase induced potentials eSA、eSB、eSCA first set of acquisition times is acquired. The detection controller 50 acquires the current second three-phase induction current iEA、iEB、iECAnd a first set of three-phase induced potentials eEA、eEB、eECA second set of acquisition times is acquired.
And judging whether the first acquisition time is matched with the second group of acquisition time. If not, the detection controller 50 sends the first group of GPS time service instructions and the second group of GPS time service instructions to the output end 52.
The first group GPS time service module 81 provides time to three power monitoring devices in the first group power monitoring device 61 according to the first group GPS time service instruction.
The second group GPS time service module 82 is used for supplying time to the three power monitoring devices 67, 68 and 69 in the second group of power monitoring devices according to the second group GPS time service instruction.
It should be understood that although the present description is described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein as a whole may be suitably combined to form other embodiments as will be appreciated by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. A fault detection system for an overhead cable, comprising:
a set of power lines;
a set of main overhead cables having a set of three-phase main power supply cables;
a group of branch overhead cables connecting the three-phase main power supply cable and the power consumption line; the branch overhead cable has a set of three-phase branch power supply cables; the three-phase branch power supply cable is respectively connected with the three-phase main power supply cable;
a set of power monitoring devices comprising three power monitoring devices; the three power monitoring devices are respectively arranged on the three-phase branch power supply cable and can collect the current three-phase induced current i of the three-phase branch power supply cableA、iBAnd iCAnd three-phase induced potential eA、eB、eC(ii) a The power monitoring equipment can output the three-phase induced current i through an output lineA、iB、iCAnd three-phase induced potential eA、eB、eC(ii) a And
a detection controller having a plurality of inputs and a plurality of outputs; the input end is respectively connected with the output lines of the three power monitoring devices and can receive the three-phase induced current iA、iB、iCAnd three-phase induced potential eA、eB、eC；
The detection controller is used for detecting the three-phase induction current iA、iB、iCAnd three-phase induced potential eA、eB、eCAnd acquiring fault detection result information.
2. The fault detection system of claim 1, wherein the detection controller respectively collects a first time three-phase induced current i according to the one set interval timeA1、iB1、iC1And first time three-phase inductionPotential eA1、eB1、eC1(ii) a And a second time three-phase induced current iA2、iB2、iC2And a second time three-phase induced potential eA2、eB2、eC2；
Three-phase induction current i according to the first timeA1、iB1、iC1And a first time three-phase induced potential eA1、eB1、eC1And a second time three-phase induced current iA2、iB2、iC2And a second time three-phase induced potential eA2、eB2、eC2Obtaining single point detection gradient according to equation 1
Judging that
If the threshold value is larger than a set single-point threshold value, fault information is sent out.
3. The fault detection system of claim 2, further comprising:
a wireless communication module disposed at the detection controller and capable of wireless bidirectional communication with the power monitoring device; the output ends of the three GPS modules are respectively connected with controllers of three electric power monitoring devices of the electric power monitoring device and can provide time for the three electric power monitoring devices; the control ends of the three GPS modules are wirelessly connected with the detection controller through the wireless communication module;
the detection controller sets first detection time and second detection time by setting interval time;
the detection controller obtains the first-time three-phase induced current through the wireless communication module at the first detection timeiA1、iB1、iC1And a first time three-phase induced potential eA1、eB1、eC1(ii) a Simultaneously, respectively acquiring three phases of first acquisition time from the three GPS modules through the wireless communication module;
the detection controller obtains the three-phase induced current i at the second time through the wireless communication module at the second detection timeA2、iB2、iC2And a second time three-phase induced potential eA2、eB2、eC2(ii) a Simultaneously, respectively acquiring three phases of second acquisition time from the three GPS modules through the wireless communication module;
the detection controller acquires acquisition interval time according to the first acquisition time and the second acquisition time; judging whether the acquisition interval time is the set interval time or not, if not, respectively acquiring the first time three-phase induced current i by the detection controller through the set interval time againA1、iB1、iC1And a first time three-phase induced potential eA1、eB1、eC1(ii) a And a second time three-phase induced current iA2、iB2、iC2And a second time three-phase induced potential eA2、eB2、eC2(ii) a And simultaneously, the detection controller sends single-point acquisition abnormity prompt information.
4. The fault detection system of claim 1, wherein the power monitoring devices are configured as a first group of power monitoring devices and a second group of power monitoring devices;
three power monitoring devices in the first group of power monitoring devices are respectively arranged at a first position of the three-phase branch power supply cable; the first position is a position close to the connection of the three-phase branch power supply cable and the three-phase main power supply cable; three power monitoring devices in the first group of power monitoring devices can acquire a first group of three-phase induced currents i of the three-phase branch power supply cable in a first positionSA、iSB、iSCAnd a first group of three-phase inductorsResponse potential eSA、eSB、eSC；
Three power monitoring devices in the first group of power monitoring devices are respectively arranged at a second position of the three-phase branch power supply cable; the second position is a position close to the connection between the three-phase branch power supply cable and the power circuit; three power monitoring devices in the second group of power monitoring devices can acquire a second group of three-phase induced current i of the three-phase branch power supply cable at a second positionEA、iEB、iECAnd a first set of three-phase induced potentials eEA、eEB、eEC。
The detection controller acquires a current first group of three-phase induction current i from the first group of power monitoring equipment according to a multi-point acquisition timeSA、iSB、iSCAnd a first set of three-phase induced potentials eSA、eSB、eSCAnd the second set of three-phase induced currents iEA、iEB、iECAnd a first set of three-phase induced potentials eEA、eEB、eEC；
According to the first three-phase induction current iSA、iSB、iSCAnd a first set of three-phase induced potentials eSA、eSB、eSCAnd the second set of three-phase induced currents iEA、iEB、iECAnd a first set of three-phase induced potentials eEA、eEB、eECObtaining a Multi-Point detection gradient by equation 2
Judging that
If the threshold value is larger than a set multipoint threshold value, fault information is sent out.
5. The fault detection system of claim 4, further comprising:
a first group of wireless communication modules, which are respectively arranged on the three power monitoring devices in the first group of power monitoring devices and can enable the three power monitoring devices in the first group of power monitoring devices to wirelessly and bidirectionally communicate with the detection controller;
a second group of wireless communication modules respectively arranged on three power monitoring devices in the second group of power monitoring devices and capable of enabling the three power monitoring devices in the second group of power monitoring devices to wirelessly and bidirectionally communicate with the detection controller;
the first group of GPS time service modules are connected with the three power monitoring devices in the first group of power monitoring devices and can provide time for the three power monitoring devices in the first group of power monitoring devices;
and the second group of GPS time service module is connected with the three power monitoring devices in the second group of power monitoring devices and can provide time for the three power monitoring devices in the second group of power monitoring devices.
6. The fault detection system of claim 5, wherein the detection controller is obtaining the current first set of three-phase sense currents iSA、iSB、iSCAnd a first set of three-phase induced potentials eSA、eSB、eSCAcquiring a first group of acquisition time;
the detection controller acquires the current second three-phase induction current iEA、iEB、iECAnd a first set of three-phase induced potentials eEA、eEB、eECAcquiring a second group of acquisition time;
the output end of the detection controller is connected with the driving ends of the first group of GPS time service modules and the second group of GPS time service modules; the detection controller judges whether the first acquisition time is matched with the second group of acquisition time; if not, the detection controller sends a first group of GPS time service instructions and a second group of GPS time service instructions to the output end;
the first group of GPS time service modules provide time to three electric power monitoring devices in the first group of electric power monitoring devices according to the first group of GPS time service instructions;
and the second group of GPS time service modules provide time to three electric power monitoring devices in the second group of electric power monitoring devices according to the second group of GPS time service instructions.
7. The fault detection method of the overhead cable is characterized by being realized by a fault detection system of the overhead cable;
the fault detection system of the overhead cable comprises:
a set of power lines;
a set of main overhead cables having a set of three-phase main power supply cables;
a group of branch overhead cables connecting the three-phase main power supply cable and the power consumption line; the branch overhead cable has a set of three-phase branch power supply cables; the three-phase branch power supply cable is respectively connected with the three-phase main power supply cable;
a set of power monitoring devices comprising three power monitoring devices; the three power monitoring devices are respectively arranged on the three-phase branch power supply cable and can collect the current three-phase induced current i of the three-phase branch power supply cableA、iBAnd iCAnd three-phase induced potential eA、eB、eC(ii) a The power monitoring equipment can output the three-phase induced current i through an output lineA、iB、iCAnd three-phase induced potential eA、eB、eC；
The fault detection method of the overhead cable comprises the following steps: according to the three-phase induced current iA、iB、iCAnd three-phase induced potential eA、eB、eCAnd acquiring fault detection result information.
8. The fault detection method of claim 7, further comprising:
respectively collecting first time three-phase induction current i according to the set interval timeA1、iB1、iC1And a first time three-phase induced potential eA1、eB1、eC1(ii) a And a second time three-phase induced current iA2、iB2、iC2And a second time three-phase induced potential eA2、eB2、eC2；
Three-phase induction current i according to the first timeA1、iB1、iC1And a first time three-phase induced potential eA1、eB1、eC1And a second time three-phase induced current iA2、iB2、iC2And a second time three-phase induced potential eA2、eB2、eC2Obtaining single point detection gradient according to equation 3
Judging that
If the threshold value is larger than a set single-point threshold value, fault information is sent out.
9. The fault detection method according to claim 1, wherein the power monitoring devices are configured as a first group of power monitoring devices and a second group of power monitoring devices;
three power monitoring devices in the first group of power monitoring devices are respectively arranged at a first position of the three-phase branch power supply cable; the first position is a position close to the connection of the three-phase branch power supply cable and the three-phase main power supply cable; the first groupThree power monitoring devices in the power monitoring device can acquire a first group of three-phase induced currents i of the three-phase branch power supply cable at a first positionSA、iSB、iSCAnd a first set of three-phase induced potentials eSA、eSB、eSC；
Three power monitoring devices in the second group of power monitoring devices are respectively arranged at a second position of the three-phase branch power supply cable; the second position is a position close to the connection between the three-phase branch power supply cable and the power circuit; three power monitoring devices in the second group of power monitoring devices can acquire a second group of three-phase induced current i of the three-phase branch power supply cable at a second positionEA、iEB、iECAnd a first set of three-phase induced potentials eEA、eEB、eEC。
The method for detecting the fault of the overhead cable further comprises the following steps:
acquiring a current first set of three-phase induced currents i from the first set of power monitoring devices according to a multi-point acquisition timeSA、iSB、iSCAnd a first set of three-phase induced potentials eSA、eSB、eSCAnd the second set of three-phase induced currents iEA、iEB、iECAnd a first set of three-phase induced potentials eEA、eEB、eEC；
According to the first three-phase induction current iSA、iSB、iSCAnd a first set of three-phase induced potentials eSA、eSB、eSCAnd the second set of three-phase induced currents iEA、iEB、iECAnd a first set of three-phase induced potentials eEA、eEB、eECObtaining a Multi-Point detection gradient by equation 4
Judging that
If the threshold value is larger than a set multipoint threshold value, fault information is sent out.
10. The fault detection method of claim 9, wherein the overhead cable fault detection system further comprises:
the GPS time service system comprises a first group of GPS time service modules and a second group of GPS time service modules;
the method for detecting the fault of the overhead cable further comprises the following steps:
obtaining the current first set of three-phase induced currents iSA、iSB、iSCAnd a first set of three-phase induced potentials eSA、eSB、eSCAcquiring a first group of acquisition time; the detection controller acquires the current second three-phase induction current iEA、iEB、iECAnd a first set of three-phase induced potentials eEA、eEB、eECAcquiring a second group of acquisition time;
judging whether the first acquisition time is matched with the second group of acquisition time; if not, the detection controller sends a first group of GPS time service instructions and a second group of GPS time service instructions to the output end;
the first group of GPS time service modules provide time to three electric power monitoring devices in the first group of electric power monitoring devices according to the first group of GPS time service instructions;
and the second group of GPS time service modules provide time to three electric power monitoring devices in the second group of electric power monitoring devices according to the second group of GPS time service instructions.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112526395A (en) * | 2020-11-30 | 2021-03-19 | 科大讯飞股份有限公司 | Vehicle-mounted display screen signal transmission detection device, method and system |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100185336A1 (en) * | 2006-07-19 | 2010-07-22 | Rovnyak Steven M | Integrated and optimized distributed generation and interconnect system controller |
| JP2011151986A (en) * | 2010-01-22 | 2011-08-04 | Denso Corp | Abnormality diagnostic device for current sensor, and abnormality diagnostic device for sensor |
| US20120004869A1 (en) * | 2010-06-07 | 2012-01-05 | Abb Research Ltd. | Systems and methods for power line event zone identification |
| CN103995214A (en) * | 2014-04-15 | 2014-08-20 | 刘骐畅 | Overhead line intelligent fault positioning processing system and method thereof |
| CN104764971A (en) * | 2015-03-18 | 2015-07-08 | 广东电网有限责任公司电力科学研究院 | Power distribution network overhead line single-phase grounding fault recognition positioning method and fault indicator |
| CN105067951A (en) * | 2015-07-27 | 2015-11-18 | 清华大学 | Single-phase earth fault range finding method of T-connection lines based on multi-time-section information |
| CN105510770A (en) * | 2015-12-04 | 2016-04-20 | 昆明理工大学 | Power transmission line one-terminal fault location method based on faulty traveling wave distribution characters along the line within two successive time windows |
| CN106707084A (en) * | 2016-12-30 | 2017-05-24 | 武汉中原电子信息有限公司 | Method for judging single-phase grounding fault of small-current grounding system |
| CN108562821A (en) * | 2018-05-08 | 2018-09-21 | 中国电力科学研究院有限公司 | A kind of method and system determining Single-phase Earth-fault Selection in Distribution Systems based on Softmax |
-
2020
- 2020-05-27 CN CN202010464258.2A patent/CN111796161B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100185336A1 (en) * | 2006-07-19 | 2010-07-22 | Rovnyak Steven M | Integrated and optimized distributed generation and interconnect system controller |
| JP2011151986A (en) * | 2010-01-22 | 2011-08-04 | Denso Corp | Abnormality diagnostic device for current sensor, and abnormality diagnostic device for sensor |
| US20120004869A1 (en) * | 2010-06-07 | 2012-01-05 | Abb Research Ltd. | Systems and methods for power line event zone identification |
| CN103995214A (en) * | 2014-04-15 | 2014-08-20 | 刘骐畅 | Overhead line intelligent fault positioning processing system and method thereof |
| CN104764971A (en) * | 2015-03-18 | 2015-07-08 | 广东电网有限责任公司电力科学研究院 | Power distribution network overhead line single-phase grounding fault recognition positioning method and fault indicator |
| CN105067951A (en) * | 2015-07-27 | 2015-11-18 | 清华大学 | Single-phase earth fault range finding method of T-connection lines based on multi-time-section information |
| CN105510770A (en) * | 2015-12-04 | 2016-04-20 | 昆明理工大学 | Power transmission line one-terminal fault location method based on faulty traveling wave distribution characters along the line within two successive time windows |
| CN106707084A (en) * | 2016-12-30 | 2017-05-24 | 武汉中原电子信息有限公司 | Method for judging single-phase grounding fault of small-current grounding system |
| CN108562821A (en) * | 2018-05-08 | 2018-09-21 | 中国电力科学研究院有限公司 | A kind of method and system determining Single-phase Earth-fault Selection in Distribution Systems based on Softmax |
Non-Patent Citations (2)
| Title |
|---|
| MATTEWOS TEFFERI 等: "Novel EPR-insulated DC cables for future multi-terminal MVDC integration", 《 IEEE ELECTRICAL INSULATION MAGAZINE》 * |
| 杨赛昭 等: "架空柔性直流电网线路故障保护综述", 《中国电机工程学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112526395A (en) * | 2020-11-30 | 2021-03-19 | 科大讯飞股份有限公司 | Vehicle-mounted display screen signal transmission detection device, method and system |
| CN112526395B (en) * | 2020-11-30 | 2023-11-17 | 科大讯飞股份有限公司 | Vehicle-mounted display screen signal transmission detection device, method and system |
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|---|---|
| CN111796161B (en) | 2023-06-13 |
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