CN111796161B - Fault detection system and fault detection method for overhead cable - Google Patents
Fault detection system and fault detection method for overhead cable Download PDFInfo
- Publication number
- CN111796161B CN111796161B CN202010464258.2A CN202010464258A CN111796161B CN 111796161 B CN111796161 B CN 111796161B CN 202010464258 A CN202010464258 A CN 202010464258A CN 111796161 B CN111796161 B CN 111796161B
- Authority
- CN
- China
- Prior art keywords
- group
- phase
- power monitoring
- monitoring devices
- time
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Locating Faults (AREA)
Abstract
The invention provides a fault detection system and a fault detection method for an overhead cable. The method can realize real-time monitoring of the overhead line. Thereby ensuring the reliability of detecting the operation of the overhead cable. The invention provides a fault detection system of an overhead cable, which comprises: a group of power utilization lines, a group of main overhead cables, a group of component support 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 bracket empty 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 with the three-phase main power supply cable. The detection controller is provided with a plurality of input ends and a plurality of output ends. And obtaining 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. And more particularly, to a fault detection system and a fault detection method for an overhead cable.
Background
In a 35KV overhead line power supply system, because of different neutral point grounding modes, when line disconnection faults occur, the influence on power supply of a power utilization unit is different. When the neutral point is grounded by adopting a small resistor, the circuit equipment can be rapidly broken to protect when single-phase grounding occurs. When the neutral point adopts a low-current grounding system or a broken line grounding fault occurs, the circuit 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 method can realize real-time monitoring of the overhead line. Thereby ensuring the reliability of detecting the operation of the overhead cable.
The invention provides a fault detection system of an overhead cable, which comprises: a group of power utilization lines, a group of main overhead cables, a group of component support 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 bracket empty 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 cables are respectively connected with the three-phase main power supply cable.
A set of power monitoring devices includes three power monitoring devices. Three electric power monitoring facilities set up respectively in three-phase branch power supply cable and can gather current three-phase induction current i of three-phase branch power supply cable A 、i B And i C Three-phase induced potential e A 、e B 、e C . The power monitoring device can output three-phase induction current i through an output line A 、i B 、i C Three-phase induced potential e A 、e B 、e C 。
The detection controller is provided with a plurality of input ends and a plurality of output ends. The input ends are respectively connected with the output lines of the three power monitoring devices and can receive the three-phase induction current i A 、i B 、i C Three-phase induced potential e A 、e B 、e C . The detection controller is used for detecting the three-phase induction current i A 、i B 、i C Three-phase induced potential e A 、e B 、e C And obtaining fault detection result information.
In another embodiment of the present invention, the detection controller respectively collects the first-time three-phase induction current i according to a set interval time A1 、i B1 、i C1 Three-phase induced potential e at first time A1 、e B1 、e C1 . And a second time three-phase induced current i A2 、i B2 、i C2 Second time three-phase induced potential e A2 、e B2 、e C2 。
According to the first time three-phase induction current i A1 、i B1 、i C1 Three-phase induced potential e at first time A1 、e B1 、e C1 And a second time three-phase induced current i A2 、i B2 、i C2 Second time three-phase induced potential e A2 、e B2 、e C2 Obtaining a single point detection gradient according to equation 1
Judging
If the fault information is larger than a set single point threshold value, the fault information is sent out.
In yet another embodiment of the present invention, further comprising: a wireless communication module and three GPS modules. The wireless communication module is arranged on the detection controller and can be in wireless bidirectional communication with the power monitoring device. The output ends of the three GPS modules are respectively connected with controllers of three power monitoring devices of the power monitoring device and can time the three power monitoring devices; the control ends of the three GPS modules are in wireless connection with the detection controller through the wireless communication module.
The detection controller sets the first detection time and the second detection time by setting the interval time. The detection controller obtains a first-time three-phase induction current i at a first detection time through the wireless communication module A1 、i B1 、i C1 Three-phase induced potential e at first time A1 、e B1 、e C1 . Simultaneously, the wireless communication module is used for respectively acquiring the first acquisition time of the three phases from the three GPS modules. The detection controller obtains a second-time three-phase induction current i at a second detection time through the wireless communication module A2 、i B2 、i C2 Second time three-phase induced potential e A2 、e B2 、e C2 . And simultaneously, respectively acquiring the three-phase 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, if not, the detection controller is switched on againRespectively collecting first-time three-phase induction current i at preset interval time A1 、i B1 、i C1 Three-phase induced potential e at first time A1 、e B1 、e C1 . And a second time three-phase induced current i A2 、i B2 、i C2 Second time three-phase induced potential e A2 、e B2 、e C2 . And meanwhile, the detection controller sends single-point acquisition abnormal prompt information.
In yet another embodiment of the present invention, the power monitoring devices are provided 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 position SA 、i SB 、i SC A first group of three-phase induced potentials e SA 、e SB 、e SC 。
The 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 utilization 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 position EA 、i EB 、i EC A first group of three-phase induced potentials e EA 、e EB 、e EC 。
The detection controller acquires the current first group of three-phase induction currents i from the first group of power monitoring equipment according to a multipoint acquisition time SA 、i SB 、i SC And a first set of three-phase induced potentials e SA 、e SB 、e SC A second group of three-phase induction currents i EA 、i EB 、i EC A first group of three-phase induced potentials e EA 、e EB 、e EC 。
According to a first set of three-phase induced currents i SA 、i SB 、i SC And a first set of three-phase induced potentials e SA 、e SB 、e SC A second group of three-phase induction currents i EA 、i EB 、i EC A first group of three-phase induced potentials e EA 、e EB 、e EC Acquiring a multi-point detection gradient ∈B2 through a formula 2:
judging
If the set multi-point threshold value is larger than the set multi-point threshold value, fault information is sent out.
In yet another embodiment of the present invention, further comprising: the GPS timing system comprises a first group of wireless communication modules, a second group of wireless communication modules, a first group of GPS timing modules and a second group of GPS timing modules.
The first group of wireless communication modules are respectively arranged on 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. 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.
The first group GPS time service module is connected with the three power monitoring devices in the first group of power monitoring devices and can time service 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 and can time service the three power monitoring devices in the second group of power monitoring devices.
In yet another embodiment of the present invention, the detection controller is acquiring a current first set of three-phase induced currents i SA 、i SB 、i SC And a first set of three-phase induced potentials e SA 、e SB 、e SC A first set of acquisition times is obtained. The detection controller acquires the current second group of three-phase induction current i EA 、i EB 、i EC A first group of three-phase induced potentials e EA 、e EB 、e EC A second set of acquisition times is acquired.
The output end of the detection controller is connected with the driving end of the first group of GPS time service modules and the driving end of 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 a first group of GPS timing instructions and a second group of GPS timing instructions to the output end.
And the first group GPS timing module timing three power monitoring devices in the first group of power monitoring devices according to the first group GPS timing instruction. And the second group GPS timing module timing three power monitoring devices in the second group of power monitoring devices according to the second group GPS timing instruction.
The invention also provides a fault detection method of the overhead cable, which is realized by a fault detection system of the overhead cable.
The fault detection system of the overhead cable includes: a group of power utilization lines, a group of main overhead cables, a group of component support 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 bracket empty 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 cables are respectively connected with the three-phase main power supply cable.
A set of power monitoring devices includes three power monitoring devices. Three electric power monitoring facilities set up respectively in three-phase branch power supply cable and can gather current three-phase induction current i of three-phase branch power supply cable A 、i B And i C Three-phase induced potential e A 、e B 、e C . The power monitoring device can output three-phase induction current i through an output line A 、i B 、i C Three-phase induced potential e A 、e B 、e C 。
The fault detection method of the overhead cable comprises the following steps: according to three-phase induction current i A 、i B 、i C Three-phase induced potential e A 、e B 、e C And obtaining fault detection result information.
In still another embodiment of the present invention, a fault detection method of an overhead cable further includes:
respectively collecting first-time three-phase induction current i according to a set interval time A1 、i B1 、i C1 Three-phase induced potential e at first time A1 、e B1 、e C1 . And a second time three-phase induced current i A2 、i B2 、i C2 Second time three-phase induced potential e A2 、e B2 、e C2 。
According to the first time three-phase induction current i A1 、i B1 、i C1 Three-phase induced potential e at first time A1 、e B1 、e C1 And a second time three-phase induced current i A2 、i B2 、i C2 Second time three-phase induced potential e A2 、e B2 、e C2 Obtaining a single point detection gradient according to equation 3
Judging
If the fault information is larger than a set single point threshold value, the fault information is sent out.
In yet another embodiment of the present invention, the power monitoring devices are provided as a first group of power monitoring devices and a second group of power monitoring devices.
First group of power monitoring devicesThe three 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 position SA 、i SB 、i SC A first group of three-phase induced potentials e SA 、e SB 、e SC 。
The 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 utilization 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 position EA 、i EB 、i EC A first group of three-phase induced potentials e EA 、e EB 、e EC 。
The fault detection method of the overhead cable further comprises the following steps:
acquiring a current first group of three-phase induction currents i from a first group of power monitoring equipment according to a multipoint acquisition time SA 、i SB 、i SC And a first set of three-phase induced potentials e SA 、e SB 、e SC A second group of three-phase induction currents i EA 、i EB 、i EC A first group of three-phase induced potentials e EA 、e EB 、e EC 。
According to a first set of three-phase induced currents i SA 、i SB 、i SC And a first set of three-phase induced potentials e SA 、e SB 、e SC A second group of three-phase induction currents i EA 、i EB 、i EC A first group of three-phase induced potentials e EA 、e EB 、e EC Acquisition of Multi-Point detection gradient by equation 4
Judging
If the set multi-point threshold value is larger than the set multi-point 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 set of GPS timing modules and a second set of GPS timing modules.
The fault detection method of the overhead cable further comprises the following steps:
acquiring a current first group of three-phase induction currents i SA 、i SB 、i SC And a first set of three-phase induced potentials e SA 、e SB 、e SC A first set of acquisition times is obtained. The detection controller acquires the current second group of three-phase induction current i EA 、i EB 、i EC A first group of three-phase induced potentials e EA 、e EB 、e EC A second set of acquisition times is acquired.
It is determined whether the first acquisition time matches the second set of acquisition times. If not, the detection controller sends a first group of GPS timing instructions and a second group of GPS timing instructions to the output end.
And the first group GPS timing module timing three power monitoring devices in the first group of power monitoring devices according to the first group GPS timing instruction.
And the second group GPS timing module timing three power monitoring devices in the second group of power monitoring devices according to the second group GPS timing instruction.
The above features, technical features, advantages and implementation manners will be further described below in a clear and understandable manner with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram illustrating a fault detection system for an overhead cable according to an embodiment of the present invention.
Fig. 2 is a schematic diagram illustrating the structure of a detection controller according to an embodiment of the present invention.
Fig. 3 is a schematic diagram illustrating a fault detection system for an overhead cable according to another embodiment of the present invention.
Fig. 4 is a schematic diagram illustrating a fault detection system for an overhead cable according to still another embodiment of the present invention.
FIG. 5 is a schematic view illustrating a fault detection system for an overhead cable according to still another embodiment of the present invention
Detailed Description
For a clearer understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described with reference to the drawings, in which like reference numerals refer to identical or structurally similar but functionally identical components throughout the separate views.
In this document, "schematic" means "serving as an example, instance, or illustration," and any illustrations, embodiments described herein as "schematic" should not be construed as a more preferred or advantageous solution. For simplicity of the drawing, only the portions related to the present exemplary embodiment are schematically shown in the drawings, and they do not represent actual structures and actual proportions thereof as products.
As shown in fig. 1, the present invention provides a fault detection system of an overhead cable, comprising: a set of power lines 30, a set of main overhead cables 10, a set of sub-rack overhead cables 20, a set 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 rack space cables 20 connects the three-phase main power supply cables 11, 12, 13 with the utility line 30. The branch overhead cable 20 has a set of three-phase branch power supply cables 21, 22, 23. The three-phase branch power supply cables 21, 22, 23 are connected to the three-phase main power supply cables 11, 12, 13, respectively, and the three-phase main power supply cables 11, 12, 13 can supply power to the three-phase branch power supply cables 21, 22, 23.
As shown in fig. 1, a set of power monitoring means includes three power monitoring devices 41, 42, 43. Three power monitoring devices 41, 42,43 are provided on the three-phase branch power supply cables 21, 22, 23, respectively, and are capable of collecting the current three-phase induced current i of the three-phase branch power supply cables 21, 22, 23 A 、i B And i C Three-phase induced potential e A 、e B 、e C . The power monitoring devices 41, 42, 43 are capable of outputting a three-phase induced current i via an output line A 、i B 、i C Three-phase induced potential e A 、e B 、e C 。
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 51 is connected to the output lines of the three power monitoring devices 41, 42, 43, respectively, and is capable of receiving a three-phase induced current i A 、i B 、i C Three-phase induced potential e A 、e B 、e C . The detection controller 50 senses the current i according to three phases A 、i B 、i C Three-phase induced potential e A 、e B 、e C And obtaining fault detection result information.
According to the invention, the current three-phase induction current and the three-phase induction potential in the three-phase branch power supply cable are obtained by arranging the induction current detection device on the three-phase branch power supply cable. And judging the power supply condition of the three-phase branch power supply cable by the current three-phase induced current and the three-phase induced potential change 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 line operation are ensured.
In another embodiment of the fault detection system for an overhead cable of the present invention, the detection controller 50 respectively acquires the first-time three-phase induced currents i according to a set interval time A1 、i B1 、i C1 Three-phase induced potential e at first time A1 、e B1 、e C1 . And a second time three-phase induced current i A2 、i B2 、i C2 Second time three-phase induced potential e A2 、e B2 、e C2 . The set interval time is 1 s-2 s.
According to the first time three-phase induction current i A1 、i B1 、i C1 Three-phase induced potential e at first time A1 、e B1 、e C1 And a second time three-phase induced current i A2 、i B2 、i C2 Second time three-phase induced potential e A2 、e B2 、e C2 Obtaining a single point detection gradient according to equation 1
Judging
If the fault information is larger than a set single point threshold value, the fault information is sent out. Normally, if a single point detection gradient +.>
Approximately 0, when broken or grounded, a maximum abrupt change in v B results, i.e., a single point detection gradient +.>
Is greater than a set single point threshold.
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 thus acquired at two acquisition times (within one interval time), respectively. By performing two-time collection of the induced current in the three-phase branch power supply cables 21, 22 and 23 and comparing the results of the two-time collection, 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 still another embodiment of the fault detection system for an overhead cable of the present invention, further includes: a 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 respectively connected with the controllers of the three power monitoring devices 41, 42, 43 of the power monitoring apparatus, and the three GPS modules 71, 72, 73 can time the three power monitoring devices 41, 42, 43. The control ends 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 the acquisition of the detection data and the accuracy of the detection 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 the first-time three-phase induction current i at the first detection time through the wireless communication module A1 、i B1 、i C1 Three-phase induced potential e at first time A1 、e B1 、e C1 . Simultaneously, the wireless communication module is used for respectively acquiring the first acquisition time of the three phases from the three GPS modules. The detection controller 50 obtains the second-time three-phase induction current i at the second detection time through the wireless communication module A2 、i B2 、i C2 Second time three-phase induced potential e A2 、e B2 、e C2 . And simultaneously, respectively acquiring the 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 acquisition interval time is the set interval time, if not, the detection controller 50 acquires the first time three-phase induction current i through the set interval time again A1 、i B1 、i C1 Three-phase induced potential e at first time A1 、e B1 、e C1 . And a second time three-phase induced current i A2 、i B2 、i C2 Second time three-phase induced potential e A2 、e B2 、e C2 . While the detection controller 50 transmits a single point acquisition anomaly prompt.
In yet another embodiment of the fault detection system for an overhead cable according to 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 apparatus 61 are provided at one first position 91 of the three-phase branch power supply cables 21, 22, 23, respectively. 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 means 61 are capable of capturing a first set of three-phase induced currents i of the three-phase branch power supply cables 21, 22, 23 at a first location 91 SA 、i SB 、i SC A first group of three-phase induced potentials e SA 、e SB 、e SC 。
As shown in fig. 4, three power monitoring devices 67, 68 and 69 in the second set of power monitoring apparatus 62 are provided at one second location 92 of the three-phase branch power supply cables 21, 22, 23, respectively. The second position 92 is a position near where the three-phase branch power supply cables 21, 22, 23 are connected to the power use line 30. Three power monitoring devices of the second set of power monitoring devices are capable of capturing a second set of three-phase induced currents i of the three-phase branch power supply cables 21, 22, 23 at a second location 92 EA 、i EB 、i EC A first group of three-phase induced potentials e EA 、e EB 、e EC 。
As shown in fig. 4, the detection controller 50 acquires a current first set of three-phase induced currents i from the first set of power monitoring devices according to a multi-point acquisition time SA 、i SB 、i SC And a first set of three-phase induced potentials e SA 、e SB 、e SC A second group of three-phase induction currents i EA 、i EB 、i EC A first group of three-phase induced potentials e EA 、e EB 、e EC 。
According to a first set of three-phase induced currents i SA 、i SB 、i SC And a first set of three-phase induced potentials e SA 、e SB 、e SC A second group of three-phase induction currents i EA 、i EB 、i EC A first group of three phasesInduced potential e EA 、e EB 、e EC Obtaining a multi-point detection gradient by equation 2
Judging
If the set multi-point threshold value is larger than the set multi-point threshold value, fault information is sent out.
In one embodiment of the present invention, the method implemented by the fault detection system for overhead cables of the present invention may be implemented by a three-phase synchronous measurement gradient method.
Aiming at single-phase broken wires of overhead insulated power wires, a broken wire head-to-tail gradient method is adopted to solve the problem. By installing at least two sets of monitoring systems at the wire branches and at the ends. If the branch fails, an alarm is displayed to the front end, and if the tail fails, an alarm is displayed to the rear end.
Let binary vectors Bs (Es (t), is (t)), be (Ee (t), ie (t)) represent the electric field and current values synchronously monitored at the branches and at the ends, respectively. Definition of the definition
▽B＝(Es(t)-Ee(t))i+(Is(t)-Ie(t))j
The gradient formula is a compound gradient formula of the head-to-tail electric field current. Setting:
then constructing an electric field current composite head-to-tail gradient as follows: see formulas 5.1-5.3
Normally, B is approximately 0, and there is a large abrupt change in B when the wire is broken or grounded.
Let alarm formula 5.4 be:
ΔE 2 +ΔI 2 ≥α (54)
alpha is an alarm threshold value. Wherein, the liquid crystal display device comprises a liquid crystal display device,
ΔE 2 ＝(e sA (t)-e eA (t)) 2 +(e sB (t)-e eB (t)) 2 +(e sC (t)-e eC (t)) 2
ΔI 2 ＝(i sA (t)-i eA (t)) 2 +(i sB (t)-i eB (t)) 2 +(i sC (t)-i eC (t)) 2
the three-phase synchronous measurement electric field and the current value of a single monitoring point can be constructed to be separated by 1 minute, and the synchronous gradient and the historical gradient change are adopted to inspect the broken line fault of the single-phase grounding fault. If the current of one phase is measured to be 0 at the same time, the other two phases are not zero. The zero phase is the broken phase when the ground electric field is considered.
The wire breakage or single-phase grounding judgment process comprises the following steps:
1.1, two sets of monitoring equipment are installed from beginning to end.
1.2, synchronizing two sets of data acquisition terminals by adopting a synchronization mode, and acquiring current and electric field data.
1.3, the synchronization technology can be realized by adopting a GPS time service module for synchronization.
1.4, calculating the second order modulus of formula (3).
1.5、ΔE 2 +ΔI 2 And if the voltage is more than or equal to alpha, judging that the disconnection or the grounding fault occurs.
1.6、ΔE 2 +ΔI 2 And < alpha, judging that no disconnection or ground fault occurs.
1.7 return to (2).
As shown in fig. 5, in still another embodiment of the present invention, further includes: a first set of wireless communication modules 74, 75 and 76, a second set of wireless communication modules 77, 78 and 79, a first set of GPS timing modules 81 and a second set of GPS timing modules 82.
As shown in fig. 5, a first group of wireless communication modules 74, 75, and 76 are provided to the three power monitoring devices 64, 65, and 66 in the first group of power monitoring apparatus 61, respectively, and enable wireless two-way communication of the three power monitoring devices 64, 65, and 66 in the first group of power monitoring apparatus 61 with the detection controller 50. The second group 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 bi-directionally with the detection controller 50.
As shown in fig. 5, the first group GPS timing module 81 connects the three power monitoring devices 67, 68, and 69 in the first group power monitoring apparatus 61 and is capable of timing the three power monitoring devices 67, 68, and 69 in the first group power monitoring apparatus 61. A second set of GPS timing modules 82 that connect the three power monitoring devices 67, 68, and 69 in the second set of power monitoring apparatus and are capable of timing the three power monitoring devices 67, 68, and 69 in the second set of power monitoring apparatus.
In yet another embodiment of the present invention, the detection controller 50 is acquiring a current first set of three-phase induced currents i SA 、i SB 、i SC And a first set of three-phase induced potentials e SA 、e SB 、e SC A first set of acquisition times is obtained. The detection controller 50 acquires the current second group of three-phase induction currents i EA 、i EB 、i EC A first group of three-phase induced potentials e EA 、e EB 、e EC A second set of acquisition times is acquired.
The output end 52 of the detection controller 50 is connected to the driving ends of the first set of GPS timing modules 81 and the second set of GPS timing 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 a first set of GPS timing instructions and a second set of GPS timing instructions to the output 52.
The first set of GPS timing module 81 timing three power monitoring devices in the first set of power monitoring devices 61 according to the first set of GPS timing instructions. The second set of GPS timing modules 82 time three power monitoring devices 67, 68, and 69 in the second set of power monitoring devices according to the second set of GPS timing instructions.
The invention also provides a fault detection method of the overhead cable, which is realized by a fault detection system of the overhead cable.
The fault detection system of the overhead cable includes: a set of power lines 30, a set of main overhead cables 10, a set of component 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 rack space cables 20 connects the three-phase main power supply cables 11, 12, 13 with the utility line 30. The branch overhead cable 20 has a set of three-phase branch power supply cables 21, 22, 23. The three-phase branch power supply cables 21, 22, 23 are connected to the three-phase main power supply cables 11, 12, 13, respectively.
A set of power monitoring devices includes three power monitoring devices. Three power monitoring devices are respectively arranged on the three-phase branch power supply cables 21, 22 and 23 and can collect the current three-phase induction current i of the three-phase branch power supply cables 21, 22 and 23 A 、i B And i C Three-phase induced potential e A 、e B 、e C . The power monitoring device can output three-phase induction current i through an output line A 、i B 、i C Three-phase induced potential e A 、e B 、e C 。
The fault detection method of the overhead cable comprises the following steps: according to three-phase induction current i A 、i B 、i C Three-phase induced potential e A 、e B 、e C And obtaining fault detection result information.
In still another embodiment of the present invention, a fault detection method of an overhead cable further includes:
respectively collecting first-time three-phase induction current i according to a set interval time A1 、i B1 、i C1 Three-phase induced potential e at first time A1 、e B1 、e C1 . And a second time three-phase induced current i A2 、i B2 、i C2 Second time three-phase induced potential e A2 、e B2 、e C2 。
According to the first time three-phase induction current i A1 、i B1 、i C1 Three-phase induced potential e at first time A1 、e B1 、e C1 And a second time three-phase induced current i A2 、i B2 、i C2 Second time three-phase induced potential e A2 、e B2 、e C2 Obtaining a single point detection gradient according to equation 3
Judging
If the fault information is larger than a set single point threshold value, the fault information is sent out.
In yet another embodiment of the present invention, the power monitoring devices are provided as a first set of power monitoring devices 61 and a second set of power monitoring devices 62.
Three power monitoring devices in the first set of power monitoring apparatus 61 are provided at one first location 91 of the three-phase branch power supply cables 21, 22, 23, respectively. 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. The three power monitoring devices of the first set of power monitoring means 61 are able to collect a first set of three-phase induced currents i of the three-phase branch power supply cables 21, 22, 23 at the first location 91 SA 、i SB 、i SC A first group of three-phase induced potentials e SA 、e SB 、e SC 。
Three power monitoring devices 67, 68 and 69 in the second group of power monitoring apparatus are provided to the three-phase branch power supply cable 21, respectively,22. 23, a second position 92. The second position 92 is a position near where the three-phase branch power supply cables 21, 22, 23 are connected to the power use line 30. The three power monitoring devices 67, 68 and 69 of the second set of power monitoring means are capable of capturing a second set of three-phase induced currents i of the three-phase branch power supply cables 21, 22, 23 at a second location 92 EA 、i EB 、i EC A first group of three-phase induced potentials e EA 、e EB 、e EC 。
The fault detection method of the overhead cable further comprises the following steps:
acquiring a current first group of three-phase induction currents i from a first group of power monitoring equipment according to a multipoint acquisition time SA 、i SB 、i SC And a first set of three-phase induced potentials e SA 、e SB 、e SC A second group of three-phase induction currents i EA 、i EB 、i EC A first group of three-phase induced potentials e EA 、e EB 、e EC 。
According to a first set of three-phase induced currents i SA 、i SB 、i SC And a first set of three-phase induced potentials e SA 、e SB 、e SC A second group of three-phase induction currents i EA 、i EB 、i EC A first group of three-phase induced potentials e EA 、e EB 、e EC Acquisition of Multi-Point detection gradient by equation 4
Judging
If the set multi-point threshold value is larger than the set multi-point 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 set of GPS timing modules 81 and a second set of GPS timing modules 82.
The fault detection method of the overhead cable further comprises the following steps:
acquiring a current first group of three-phase induction currents i SA 、i SB 、i SC And a first set of three-phase induced potentials e SA 、e SB 、e SC A first set of acquisition times is obtained. The detection controller 50 acquires the current second group of three-phase induction currents i EA 、i EB 、i EC A first group of three-phase induced potentials e EA 、e EB 、e EC A second set of acquisition times is acquired.
It is determined whether the first acquisition time matches the second set of acquisition times. If not, the detection controller 50 sends a first set of GPS timing instructions and a second set of GPS timing instructions to the output 52.
The first set of GPS timing module 81 timing three power monitoring devices in the first set of power monitoring devices 61 according to the first set of GPS timing instructions.
The second set of GPS timing modules 82 time three power monitoring devices 67, 68, and 69 in the second set of power monitoring devices according to the second set of GPS timing instructions.
It should be understood that although the present disclosure has been described in terms of various embodiments, not every embodiment is intended to include only a single embodiment, and that such descriptions are provided for clarity only, and that the disclosure is not limited to the embodiments shown and described herein, as such, may be suitably combined in any number of embodiments, as would be apparent to one of ordinary skill in the art.
The above list of detailed descriptions is only specific to practical embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the spirit of the present invention should be included in the scope of the present invention.
Claims (8)
1. A fault detection system for an overhead cable, comprising:
a set of electrical lines;
a set of main overhead cables having a set of three-phase main power supply cables;
a group of bracket empty cables which connect 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 cables are respectively connected with the three-phase main power supply cable;
a set of power monitoring devices comprising three power monitoring apparatuses; the three power monitoring devices are respectively arranged on the three-phase branch power supply cable and can collect the current three-phase induction current i of the three-phase branch power supply cable A 、i B And i C Three-phase induced potential e A 、e B 、e C The method comprises the steps of carrying out a first treatment on the surface of the The power monitoring device can output the three-phase induction current i through an output line A 、i B 、i C Three-phase induced potential e A 、e B 、e C The method comprises the steps of carrying out a first treatment on the surface of the And
a detection controller having a plurality of inputs and a plurality of outputs; the input ends are respectively connected with the output lines of the three power monitoring devices and can receive the three-phase induction current i A 、i B 、i C Three-phase induced potential e A 、e B 、e C The method comprises the steps of carrying out a first treatment on the surface of the The detection controller is used for detecting the three-phase induction current i A 、i B 、i C Three-phase induced potential e A 、e B 、e C Obtaining fault detection result information; the detection controller respectively collects three-phase induction currents i at the first time according to a set interval time A1 、i B1 、i C1 Three-phase induced potential e at first time A1 、e B1 、e C1 The method comprises the steps of carrying out a first treatment on the surface of the And a second time three-phase induced current i A2 、i B2 、i C2 Second time three-phase induced potential e A2 、e B2 、e C2 ；
According to the first time three-phase induction current i A1 、i B1 、i C1 Three-phase induced potential e at first time A1 、e B1 、e C1 And a second time of threePhase induced current i A2 、i B2 、i C2 Second time three-phase induced potential e A2 、e B2 、e C2 Obtaining a single point detection gradient according to equation 1
Judging the said
If the fault information is larger than a set single point threshold value, the fault information is sent out.
2. The fault detection system of claim 1, further comprising:
a wireless communication module provided to the detection controller and capable of wireless two-way communication with the power monitoring device; the output ends of the three GPS modules are respectively connected with controllers of three power monitoring devices of the power monitoring device and can time the three power monitoring devices; the control ends of the three GPS modules are in wireless connection with the detection controller through the wireless communication module;
the detection controller sets a first detection time and a second detection time through setting interval time;
the detection controller obtains the first-time three-phase induction current i at the first detection time through the wireless communication module A1 、i B1 、i C1 Three-phase induced potential e at first time A1 、e B1 、e C1 The method comprises the steps of carrying out a first treatment on the surface of the Simultaneously, the wireless communication module is used for respectively acquiring the first acquisition time of three phases from the three GPS modules;
the detection controller acquires the second-time three-phase induction current i at the second detection time through the wireless communication module A2 、i B2 、i C2 A second time three phaseInduced potential e A2 、e B2 、e C2 The method comprises the steps of carrying out a first treatment on the surface of the Simultaneously, respectively acquiring three-phase 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, if not, the detection controller acquires first time three-phase induction current i through the set interval time again A1 、i B1 、i C1 Three-phase induced potential e at first time A1 、e B1 、e C1 The method comprises the steps of carrying out a first treatment on the surface of the And a second time three-phase induced current i A2 、i B2 、i C2 Second time three-phase induced potential e A2 、e B2 、e C2 The method comprises the steps of carrying out a first treatment on the surface of the And the detection controller sends single-point acquisition abnormal prompt information.
3. The fault detection system of claim 1, wherein the power monitoring devices are configured as a first set of power monitoring devices and a second set 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 collect a first group of three-phase induction currents i of the three-phase branch power supply cable at a first position SA 、i SB 、i SC A first group of three-phase induced potentials e SA 、e SB 、e SC ；
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 of the three-phase branch power supply cable and the power utilization line; three power monitoring devices in the second group of power monitoring devices can collect the second group of the three-phase branch power supply cables at the second positionThree-phase induction current i EA 、i EB 、i EC A first group of three-phase induced potentials e EA 、e EB 、e EC ；
The detection controller acquires the current first group of three-phase induction current i from the first group of power monitoring equipment according to a multipoint acquisition time SA 、i SB 、i SC And a first set of three-phase induced potentials e SA 、e SB 、e SC The second group of three-phase induction currents i EA 、i EB 、i EC A first group of three-phase induced potentials e EA 、e EB 、e EC ；
According to the first group of three-phase induction currents i SA 、i SB 、i SC And a first set of three-phase induced potentials e SA 、e SB 、e SC The second group of three-phase induction currents i EA 、i EB 、i EC A first group of three-phase induced potentials e EA 、e EB 、e EC Obtaining a multi-point detection gradient by equation 2
Judging the said
If the set multi-point threshold value is larger than the set multi-point threshold value, fault information is sent out.
4. The fault detection system of claim 3, further comprising:
a first group of wireless communication modules which are respectively arranged on 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 provided to the three power monitoring devices in the second group of power monitoring apparatuses and capable of wireless bidirectional communication between the three power monitoring devices in the second group of power monitoring apparatuses and the detection controller;
a first set of GPS timing modules connected to and capable of timing three power monitoring devices in the first set of power monitoring devices;
and the second group GPS time service module is connected with and can time service the three power monitoring devices in the second group of power monitoring devices.
5. The fault detection system of claim 4, wherein the detection controller is configured to obtain the current first set of three-phase induced currents i SA 、i SB 、i SC And a first set of three-phase induced potentials e SA 、e SB 、e SC Acquiring a first group of acquisition time;
the detection controller acquires the current second group of three-phase induction currents i EA 、i EB 、i EC A first group of three-phase induced potentials e EA 、e EB 、e EC Acquiring a second set of acquisition times;
the output end of the detection controller is connected with the driving end of the first group of GPS time service modules and the driving end of the second group of GPS time service modules; the detection controller judges whether the first group of acquisition time is matched with the second group of acquisition time; if not, the detection controller sends a first group of GPS timing instructions and a second group of GPS timing instructions to the output end;
the first group GPS timing module timing three power monitoring devices in the first group of power monitoring devices according to the first group GPS timing instruction;
and the second group GPS timing module timing three power monitoring devices in the second group of power monitoring devices according to the second group GPS timing instruction.
6. The fault detection method of the overhead cable is characterized by being realized through a fault detection system of the overhead cable;
the fault detection system of the overhead cable includes:
a set of electrical lines;
a set of main overhead cables having a set of three-phase main power supply cables;
a group of bracket empty cables which connect 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 cables are respectively connected with the three-phase main power supply cable;
a set of power monitoring devices comprising three power monitoring apparatuses; the three power monitoring devices are respectively arranged on the three-phase branch power supply cable and can collect the current three-phase induction current i of the three-phase branch power supply cable A 、i B And i C Three-phase induced potential e A 、e B 、e C The method comprises the steps of carrying out a first treatment on the surface of the The power monitoring device can output the three-phase induction current i through an output line A 、i B 、i C Three-phase induced potential e A 、e B 、e C ；
The fault detection method of the overhead cable comprises the following steps: according to the three-phase induction current i A 、i B 、i C Three-phase induced potential e A 、e B 、e C Obtaining fault detection result information;
the fault detection method further comprises the following steps:
respectively collecting first-time three-phase induction current i according to a set interval time A1 、i B1 、i C1 Three-phase induced potential e at first time A1 、e B1 、e C1 The method comprises the steps of carrying out a first treatment on the surface of the And a second time three-phase induced current i A2 、i B2 、i C2 Second time three-phase induced potential e A2 、e B2 、e C2 ；
According to the first timeInter-three phase induced current i A1 、i B1 、i C1 Three-phase induced potential e at first time A1 、e B1 、e C1 And a second time three-phase induced current i A2 、i B2 、i C2 Second time three-phase induced potential e A2 、e B2 、e C2 Obtaining a single point detection gradient according to equation 3
Judging the said
If the fault information is larger than a set single point threshold value, the fault information is sent out.
7. The fault detection method of claim 6, 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 collect a first group of three-phase induction currents i of the three-phase branch power supply cable at a first position SA 、i SB 、i SC A first group of three-phase induced potentials e SA 、e SB 、e SC ；
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 utilization line; three power monitoring devices in the second set of power monitoring apparatus are capable ofA second group of three-phase induction currents i of the three-phase branch power supply cable at a second position can be collected EA 、i EB 、i EC A first group of three-phase induced potentials e EA 、e EB 、e EC ；
The fault detection method of the overhead cable further comprises the following steps:
acquiring a current first group of three-phase induction currents i from the first group of power monitoring equipment according to a multipoint acquisition time SA 、i SB 、i SC And a first set of three-phase induced potentials e SA 、e SB 、e SC The second group of three-phase induction currents i EA 、i EB 、i EC A first group of three-phase induced potentials e EA 、e EB 、e EC ；
According to the first group of three-phase induction currents i SA 、i SB 、i SC And a first set of three-phase induced potentials e SA 、e SB 、e SC The second group of three-phase induction currents i EA 、i EB 、i EC A first group of three-phase induced potentials e EA 、e EB 、e EC Acquisition of Multi-Point detection gradient by equation 4
Judging the said
If the set multi-point threshold value is larger than the set multi-point threshold value, fault information is sent out.
8. The fault detection method of claim 7, wherein the fault detection system of the overhead cable further comprises: a first group of GPS timing modules and a second group of GPS timing modules;
the fault detection method of the overhead cable further comprises the following steps:
acquiring the current first group of three-phase induction currents i SA 、i SB 、i SC And a first set of three-phase induced potentials e SA 、e SB 、e SC Acquiring a first group of acquisition time; the detection controller acquires the current second group of three-phase induction currents i EA 、i EB 、i EC A first group of three-phase induced potentials e EA 、e EB 、e EC Acquiring a second set of acquisition times;
judging whether the first group of acquisition time is matched with the second group of acquisition time; if not, the detection controller sends a first group of GPS timing instructions and a second group of GPS timing instructions to the output end;
the first group GPS timing module timing three power monitoring devices in the first group of power monitoring devices according to the first group GPS timing instruction;
and the second group GPS timing module timing three power monitoring devices in the second group of power monitoring devices according to the second group GPS timing instruction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010464258.2A CN111796161B (en) | 2020-05-27 | 2020-05-27 | Fault detection system and fault detection method for overhead cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010464258.2A CN111796161B (en) | 2020-05-27 | 2020-05-27 | Fault detection system and fault detection method for overhead cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111796161A CN111796161A (en) | 2020-10-20 |
| CN111796161B true CN111796161B (en) | 2023-06-13 |
Family
ID=72806317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010464258.2A Active CN111796161B (en) | 2020-05-27 | 2020-05-27 | Fault detection system and fault detection method for overhead cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111796161B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011151986A (en) * | 2010-01-22 | 2011-08-04 | Denso Corp | Abnormality diagnostic device for current sensor, and abnormality diagnostic device for sensor |
| 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 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8190299B2 (en) * | 2006-07-19 | 2012-05-29 | Rovnyak Steven M | Integrated and optimized distributed generation and interconnect system controller |
| WO2011156394A2 (en) * | 2010-06-07 | 2011-12-15 | Abb Research Ltd. | Systems and methods for classifying power line events |
-
2020
- 2020-05-27 CN CN202010464258.2A patent/CN111796161B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011151986A (en) * | 2010-01-22 | 2011-08-04 | Denso Corp | Abnormality diagnostic device for current sensor, and abnormality diagnostic device for sensor |
| 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 |
|---|
| Novel EPR-insulated DC cables for future multi-terminal MVDC integration;Mattewos Tefferi 等;《 IEEE Electrical Insulation Magazine》;20191031;第35卷(第5期);第20-27页 * |
| 架空柔性直流电网线路故障保护综述;杨赛昭 等;《中国电机工程学报》;20191120;第39卷(第22期);第6600-6616页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111796161A (en) | 2020-10-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2985613B1 (en) | Method and system for detecting and locating single-phase ground fault on low current grounded power-distribution network | |
| CN102590676B (en) | Device and method for detecting fault of direct current looped network of direct current power supply system | |
| CN103336218B (en) | A kind of mixed power transmission line shorted to earth fault reclosing criterion system | |
| CN107294071B (en) | The guard method of power distribution network small resistance grounding system and device | |
| CN106133534B (en) | The measurement method of the energy consumption of electric network branch and the measuring device for implementing the method | |
| CN102386678A (en) | Fault positioning monitoring system for distribution network | |
| CN111796161B (en) | Fault detection system and fault detection method for overhead cable | |
| CN103698651A (en) | Method and device for monitoring crossing of direct current insulated buses | |
| CN109298332A (en) | A kind of portable beaker characteristic test device | |
| CN104535906A (en) | Method for monitoring and positioning instant insulation faults of direct current system and device for implementing method | |
| CN106353646B (en) | A kind of Insulation monitoring control method based on high voltage direct current power supply system | |
| JP4592710B2 (en) | Accident location system | |
| KR20190075735A (en) | Device for diagnosing partial discharge of cable | |
| CN205016051U (en) | Substation equipment's temperature monitoring system | |
| CN209387822U (en) | A kind of portable beaker characteristic test device | |
| CN103915793A (en) | Signal monitoring anti-thunder distribution cabinet and implementation method | |
| CN203720293U (en) | Device used for monitoring DC insulation bus interaction | |
| CN108051693A (en) | A kind of method of the raising earth fault judgment accuracy based on TAS devices | |
| KR101919860B1 (en) | power monitoring system using information for power module | |
| CN114355104A (en) | Low-current grounding line selection method, system and device | |
| CN202793594U (en) | Temperature measuring equipment of cable joint of switch cabinet | |
| CN105988088A (en) | Method and system for detecting DC bus branch crossing | |
| JP2012242365A (en) | Ground fault detector of direct current electric line | |
| KR101873005B1 (en) | 3 Phase 4 Wires Zero Current Transformer for Detecting Insulation Resistance | |
| CN103320815B (en) | Cell insulation detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |