CN111431057A - Integrated intelligent ring main unit system, intelligent power distribution network and fault positioning method - Google Patents
Integrated intelligent ring main unit system, intelligent power distribution network and fault positioning method Download PDFInfo
- Publication number
- CN111431057A CN111431057A CN202010336591.5A CN202010336591A CN111431057A CN 111431057 A CN111431057 A CN 111431057A CN 202010336591 A CN202010336591 A CN 202010336591A CN 111431057 A CN111431057 A CN 111431057A
- Authority
- CN
- China
- Prior art keywords
- ring main
- fault
- main unit
- intelligent
- unit
- 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.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/30—Cabinet-type casings; Parts thereof or accessories therefor
- H02B1/32—Mounting of devices therein
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
-
- 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
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
-
- 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)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention provides an integrated intelligent ring main unit system, an intelligent power distribution network and a fault positioning method, wherein the intelligent power distribution network comprises the intelligent ring main unit system, each interval unit of the system is provided with an independent DTU, primary equipment and secondary equipment are integrally installed, the DTUs can perform information interaction with adjacent DTUs and a power distribution main station, a feeder line section which detects fault current and does not detect the fault current at the downstream is a fault section, quick fault isolation is realized through tripping of a breaker, fault recovery at the upstream of the fault section is realized through reclosing of the breaker, and fault recovery at the downstream of the fault section is realized through closing an interconnection switch. The intelligent power distribution network fault location method is suitable for rapid fault location, fault isolation and fault recovery of the intelligent power distribution network with the high power supply capacity network frame, achieves a rapid self-healing function of the intelligent power distribution network, and improves power supply quality and power supply reliability.
Description
Technical Field
The invention relates to the technical field of ring main units and intelligent power distribution networks, in particular to an integrated intelligent ring main unit system suitable for an intelligent power grid, an intelligent power distribution network and a fault positioning method.
Background
With the continuous improvement of the quality of life of people and the continuous improvement of the demand for power supply reliability, the smart grid is rapidly developed. The intelligent power distribution network is directly oriented to users, has a complex structure and high failure rate, and is a main link influencing the power supply reliability of a power grid. In order to fully exert the advantages of the intelligent power distribution network and improve the power supply reliability, the power distribution network equipment is urgently needed to be upgraded. The ring main unit is a key device of the power distribution network, and the performance of the ring main unit directly influences the power supply reliability of the power distribution network. In order to meet the demand of an intelligent power distribution network, an intelligent ring main unit comes from the beginning, see documents Yao Guang, Fangjin, Zhangwei. an intelligent ring main unit design based on a distributed power distribution terminal, a communication power supply technology, 2019, 36 (3): 73,74. However, the intelligent ring main unit does not fully utilize the advantage of the high power supply capacity network frame of the intelligent power distribution network, cannot realize quick fault location and fault recovery, and cannot meet the quick self-healing requirement of the intelligent power distribution network. There is a need for an intelligent ring main unit capable of fully utilizing a high power supply capacity network frame to realize rapid fault location and fault recovery of an intelligent power distribution network.
Disclosure of Invention
The invention aims to overcome the defect that the traditional intelligent ring main unit cannot realize quick fault location and fault isolation of an intelligent power distribution network, and reduce the influence of faults on the power distribution network; the high power supply ability rack of unable make full use of intelligent power distribution network realizes the quick fault recovery of intelligent power distribution network, improves the power supply reliability. The invention provides an integrated intelligent ring main unit system suitable for an intelligent power distribution network, the intelligent power distribution network and a fault positioning method, which are used for realizing rapid fault positioning, fault isolation and fault recovery of the intelligent power distribution network and improving the power supply reliability of the power distribution network.
The technical scheme adopted for solving the technical problems is as follows: an integrated intelligent ring main unit system suitable for an intelligent power grid comprises at least one intelligent ring main unit, each intelligent ring main unit comprises a plurality of ring main unit interval units, each ring main unit interval unit consists of primary equipment and secondary equipment, each ring main unit interval unit is provided with an independent DTU, and the primary equipment and the secondary equipment are integrally designed and are independent of other ring main unit interval units; the primary equipment comprises a primary switch device, a current transformer, an operating mechanism and the like, wherein a ring main unit with the primary switch device as a load switch is called a load switch cabinet, and a ring main unit with the primary switch device as a circuit breaker is called a circuit breaker cabinet; the secondary equipment mainly comprises a Distribution Terminal Unit (DTU), a man-machine interface and the like. The DTU can carry out automatic switching-on and switching-off operation on the primary switching device through a control signal; the primary equipment is arranged on the primary loop, and the DTU can measure the current of the primary loop through the current transformer; information interaction can be carried out between DTUs of adjacent ring main unit interval units in the same intelligent ring main unit and between DTUs of adjacent ring main unit interval units in adjacent intelligent ring main units; when the primary switch device of the intelligent ring main unit is an interconnection switch, the intelligent ring main unit is called an interconnection switch cabinet, and the DTU of the ring main unit interval unit can also perform information interaction with the DTU of the interconnection switch cabinet; and fault positioning, fault isolation and fault recovery of the power distribution network are realized by the interval units of the ring main units in the power distribution network through information interaction of the DTUs.
An intelligent power distribution network comprises at least two feeder lines, wherein each feeder line is provided with a main station and the intelligent ring main unit system, the main station and the adjacent intelligent ring main units in the power distribution network perform information interaction through DTUs of ring main unit interval units, and the fault positioning, fault isolation and fault recovery of the power distribution network are realized; and the ring main unit interval units among different feeders carry out information interaction through the DTU of the interconnection switch cabinet unit.
Specifically, all the intelligent ring main units in each feeder line are circuit breaker units or load switch units, or part of the intelligent ring main units are circuit breaker units and part of the intelligent ring main units are load switch units.
The main website is the distribution network integrated monitoring system who installs at the transformer substation, the fault location of traditional distribution network, fault isolation and fault recovery are all realized by the main website, the electric information that each looped netowrk cabinet's terminal device uploaded the monitoring reaches the main website promptly, the main website carries out the analysis back to the data that each terminal device uploaded, at the operating condition of transformer substation dynamic display distribution network, and judge whether the trouble has taken place, if the trouble takes place, then send alarm signal, and give remote control command to the terminal device of looped netowrk cabinet, realize the fault location of distribution network, fault isolation and fault recovery. The master station in the intelligent power distribution network has the function of the traditional power distribution network master station, only the function of fault processing is handed to the intelligent power distribution terminal device with higher processing speed, and the fault processing of the master station is only used as a backup for the fault processing of the intelligent power distribution terminal device. The specific fault positioning method comprises the following steps:
a fault location method of an intelligent power distribution network is characterized in that a ring main unit interval unit of an intelligent ring main unit judges whether fault current flows through a local unit according to the primary loop current detected by a DTU (data transfer unit), and if the fault current flows through the local unit, fault information is sent to a ring main unit interval unit of an upstream intelligent ring main unit; if no fault current flows, no fault information is sent upstream. And the downstream feeder section of the ring main unit which does not receive the downstream fault information is a fault section, and the fault section information is sent to the downstream ring main unit, so that the fault location of the power distribution network is realized.
If the intelligent ring main unit is a circuit breaker main unit, after the local ring main unit interval unit detects fault current, fault information is sent to an upstream ring main unit interval unit of the local ring main unit, and a brake-separating and locking command is sent at the same time; if the intelligent ring main unit is a load switch cabinet, after the ring main unit interval unit detects fault current, a brake-separating locking command is not sent to an upstream ring main unit interval unit; no matter the circuit breaker cabinet or the load switch cabinet, the ring main unit sends an opening and locking command to the upstream ring main unit after receiving the opening and locking command of the downstream ring main unit.
If the intelligent ring main unit is a circuit breaker, when the ring main unit interval unit detects fault current and does not receive a downstream ring main unit opening and locking command, the circuit breaker unit sends a tripping command to a local circuit breaker to trip off a local switch; if the intelligent ring main unit is a load switch cabinet, when the ring main unit interval unit of the load switch cabinet detects fault current, the tripping command is not executed, and tripping is performed when no voltage or no current (no voltage or no current) is detected, so that fault isolation is realized.
If the intelligent ring main unit is a breaker main unit, after a ring main unit interval unit of the breaker main unit executes a tripping command, if a local ring main unit interval unit detects a fault and receives fault information of a downstream ring main unit interval unit, reclosing is executed after a certain time delay, the breaker is reclosed, and otherwise, reclosing is not executed; if the local intelligent ring main unit is a load switch cabinet, if the ring main unit interval unit of the load switch cabinet detects fault voltage and receives fault information of a downstream ring main unit interval unit, executing a closing command and re-closing, otherwise, not executing the closing command, thereby realizing fault recovery of the upstream of a fault section.
Furthermore, the intelligent ring main unit at the downstream of the fault section sends a closing command to the interconnection switch cabinet unit connected with the feeder line to execute closing, and the ring main unit between the ring main unit at the downstream of the fault section and the interconnection switch cabinet unit executes closing after detecting voltage, so that the fault recovery at the downstream of the fault section is realized.
Furthermore, the ring main unit interval unit of the intelligent ring main unit has an automatic fault-tolerant function for the fault current of the missing detection, if the fault current flows locally and the local ring main unit does not detect the fault current, but the downstream ring main unit detects the fault current and sends fault information to the unit, the unit judges that the missing detection occurs, judges that the fault current of the unit flows, and sends the fault information to the upstream ring main unit, thereby realizing the fault-tolerant function for the missing detection.
The ring main unit interval units of the intelligent ring main unit are all interconnected with the power distribution main station through the Ethernet, information interaction is carried out between the ring main unit interval units and the advanced measurement system AMI of the main station, and remote measurement, remote signaling and remote control functions of the ring main unit interval units are mainly realized through the Ethernet.
The invention has the beneficial effects that: the integrated intelligent ring main unit system, the intelligent power distribution network and the fault positioning method which are suitable for the intelligent power grid are suitable for the intelligent power distribution network, and under the condition that a power distribution master station does not participate, quick fault positioning, fault isolation and fault recovery of the intelligent power distribution network are achieved, and power distribution and supply reliability is improved.
Drawings
FIG. 1 is a block diagram of an intelligent ring main unit system according to the present invention;
FIG. 2 is a block diagram of the intelligent ring main unit according to the present invention;
fig. 3 is a schematic diagram of a scheme of an intelligent power distribution network using the intelligent ring main unit system according to the present invention.
Detailed Description
The present invention will now be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, and merely illustrates the basic structure of the present invention in a schematic manner, and therefore it shows only the constitution related to the present invention.
The invention provides an integrated intelligent ring main unit system suitable for an intelligent power grid, which is realized by the following technical scheme and comprises at least one intelligent ring main unit, wherein each intelligent ring main unit comprises a plurality of ring main unit interval units, and each ring main unit interval unit comprises primary equipment and secondary equipment.
Fig. 1 shows a block diagram of an intelligent ring main unit system according to the present invention. The intelligent ring main unit system in the figure comprises a power distribution main station and N intelligent ring main units, which are respectively represented by ring main units 1 to N, each intelligent ring main unit consists of a plurality of ring main unit interval units, each intelligent ring main unit consists of four ring main unit interval units in the embodiment, G1, G2, G3 and G4 are ring main unit interval units in the figure, and a DTU is a power distribution terminal unit. Each ring main unit interval unit consists of primary equipment and secondary equipment, each ring main unit interval unit is provided with an independent DTU, and the ring main unit interval units perform information interaction with other ring main unit interval units and a power distribution main station through the DTUs.
Fig. 2 shows a block diagram of a ring main unit interval unit structure of the present invention, which includes a DTU, a human-computer interface, a current transformer, a primary switch device and an operating mechanism, wherein the primary device is composed of the primary switch device, the current transformer, the operating mechanism, etc., the ring main unit in which the primary switch device is a load switch is called a load switch cabinet, and the ring main unit in which the primary switch device is a circuit breaker is called a circuit breaker cabinet; the secondary equipment mainly comprises a power distribution terminal unit DTU, a man-machine interface and the like. The DTU detects the current flowing through the interval unit of the ring main unit through a current transformer and judges whether the current is fault current or not; the DTU outputs an opening or closing control command to the primary switching device according to the working state of the intelligent power distribution network, so that automatic opening and closing of the primary switching device are realized; the DTU displays the working state through a display instrument in the man-machine interface, and realizes corresponding control commands or parameter configuration through a keyboard or a touch screen; the DTU utilizes the communication module inside to communicate with other ring main unit interval units and the power distribution main station through the Ethernet or the wireless network. The primary switching device can also carry out manual switching-off and switching-on operations through the operating mechanism.
As a further scheme, the intelligent power distribution network using the intelligent ring main unit system is further provided, the intelligent power distribution network comprises at least two feeders, each feeder is provided with a main station and the intelligent ring main unit system, the main station is a power distribution network comprehensive monitoring system installed in a transformer substation, different main stations are in parallel relation, and each main station manages an intelligent power distribution terminal device on the feeder of the transformer substation, namely, the terminal device of each intelligent ring main unit is only communicated with the main station of the transformer substation and is not contacted with other main stations. Of course, information interaction can be performed between the master station and the master station, and between the master station and the scheduling center. Information interaction is carried out between the main station and the adjacent intelligent ring main units and among the intelligent ring main units in the power distribution network through the DTUs of the ring main unit interval units, so that fault location, fault isolation and fault recovery of the power distribution network are realized.
Fig. 3 is a schematic diagram of a smart distribution network according to the present invention. The intelligent power distribution network who simplifies in this embodiment comprises 2 feeders, has all installed distribution main website and a plurality of intelligence looped netowrk cabinet on every feeder. In the figure, a main station 1 and a main station 2 are respectively a power distribution network comprehensive monitoring system installed in a transformer substation 1 and a transformer substation 2, Si (i =1,2,3.. eta.) is a primary switch device of a ring main unit, each ring main unit is provided with a primary switch device and a DTU, the primary switch device can be a circuit breaker or a load switch, when the power distribution network normally operates, a switch is in a closed state and is a section switch, and when the power distribution network normally operates, the switch is in an open state and is an interconnection switch, in the figure, S11 is the interconnection switch, and other switches are the section switches. Information interaction can be carried out among the DTUs and between the DTUs and the master station.
In order to specifically describe the technical implementation of the method for locating a fault in an intelligent ring main unit, the following takes the occurrence of a short-circuit fault at point k shown in fig. 3 as an example to describe in detail.
Without loss of generality, it is assumed that S1, S2, S3, S4, S11, S14, S15, S16, and S17 are circuit breakers, and the other switches S5, S6, S7, S8, S9, S10, S12, and S13 are load switches, that is, part of the intelligent ring main units are circuit breaker units, and part of the intelligent ring main units are load switch units. The interval units of the ring main units where the DTU2 and the DTU5 are located are connected with loads, fault current cannot be detected, and the detected fault current is load current output by the ring main units. Therefore, after a short-circuit fault occurs at point k, fault currents are detected by the DTU1, the DTU3, the DTU4 and the DTU6, and because S2 and S4 are circuit breakers and S5 and S7 are load switches, the DTU6 sends fault information to the DTU4, the DTU4 sends fault information to the DTU3, and the DTU3 sends fault information and a brake separating and locking command to the DTU 1. Because the DTU6 does not receive the fault information sent by the downstream DTU7, the DTU6 determines that the fault section is a section between the DTU6 and the DTU7, and the DTU6 sends the fault section information to the DTU7, thereby implementing fault section location. Although the DTUs 4 and 6 detect the fault current, the primary switch device of the ring main unit interval unit is a load switch and cannot cut off the short-circuit current, so the DTUs do not output the trip command, and the switches S5 and S7 do not trip. The DTU3 detects the fault current signal and does not receive the opening blocking signal of the downstream DTU4, and the local primary switching device is a breaker, so the DTU3 outputs a tripping command to trip the switch S4, which causes the switches S5, S6, S7, S8, S9 and S10 to power off and trip, thereby achieving fault isolation. Because the feeder section behind the DTU3 is not a faulty section, after a certain delay, a reclosing command is issued, causing the switch S4 to reclose. Since the feeder section behind the DTU4 is not a fault section, when the DTU4 detects a voltage, it outputs a close command to close the switch S5. Since the feeder section behind DTU6 is a faulty section, the close command is no longer output, leaving switch S7 in the open state. Since the faulty section is located in the feeder section in front of DTU7, after it is reliably switched off, a fault recovery command is issued to DTU10 of the tie switchgear unit connected to feeder 1, and then DTU10 issues a switch-on command, causing switch S11 to perform switch-on. And after the DTU9 and the DTU7 detect the voltage, closing commands are respectively sent out to close the switches S10 and S8, so that the fault recovery of the load at the downstream of the fault section is realized.
It is assumed that all switches are circuit breakers. After a short-circuit fault occurs at point k, the DTU1, the DTU3, the DTU4 and the DTU6 detect fault currents, the DTU6 detects the fault currents and does not receive fault current information of a downstream DTU, a tripping command is sent out, the switch S7 is tripped, fault positioning information is sent to the DTU7, meanwhile, the DTU6 sends fault information and a brake separating and locking command to the DTU4, and the DTU4 sends the fault information and the brake separating and locking command to the DTU 3. Since the faulty section is located in the feeder section in front of DTU7, after it is reliably switched off, a fault recovery command is issued to DTU10 of the tie switchgear unit connected to feeder 1, and then DTU10 issues a switch-on command, causing switch S11 to perform switch-on. And after the DTU9 and the DTU7 detect the voltage, closing commands are respectively sent out to close the switches S10 and S8, so that the fault recovery of the load at the downstream of the fault section is realized.
In light of the foregoing description of preferred embodiments in accordance with the invention, it is to be understood that numerous changes and modifications may be made by those skilled in the art without departing from the scope of the invention. The technical scope of the present invention is not limited to the contents of the specification, and must be determined according to the scope of the claims.
Claims (9)
1. The utility model provides an integration intelligence looped netowrk cabinet system which characterized in that: the intelligent ring main unit comprises at least one intelligent ring main unit, each intelligent ring main unit comprises a plurality of ring main unit interval units, each ring main unit interval unit comprises primary equipment and secondary equipment, and the primary equipment and the secondary equipment of each ring main unit interval unit are integrally designed and are independent of other ring main unit interval units; the primary equipment comprises a primary switch device, a current transformer and an operating mechanism, the secondary equipment comprises a DTU (data transfer unit) and a human-computer interface, and each ring main unit interval unit is provided with an independent DTU; the DTU can carry out automatic switching-on and switching-off operation on the primary switching device through a control signal, and can measure the current of a primary loop through a current transformer; information interaction can be carried out between the DTUs of the adjacent ring main unit interval units in the same intelligent ring main unit and between the DTUs of the adjacent ring main unit interval units in the adjacent intelligent ring main units.
2. The utility model provides a smart power distribution network which characterized in that: the intelligent ring main unit system comprises at least two feeder lines, wherein each feeder line is provided with a main station and the intelligent ring main unit system as claimed in claim 1, the main station and the adjacent intelligent ring main units as well as the intelligent ring main units in the power distribution network carry out information interaction through DTUs of ring main unit spacing units, and therefore fault location, fault isolation and fault recovery of the power distribution network are achieved; and the ring main unit interval units among different feeders carry out information interaction through the DTU of the interconnection switch cabinet unit.
3. The intelligent power distribution network of claim 2, wherein: all the intelligent ring main units in each feeder line are circuit breaker units or load switch cabinets, or part of the intelligent ring main units are circuit breaker units and part of the intelligent ring main units are load switch cabinets.
4. A fault positioning method for an intelligent power distribution network is characterized by comprising the following steps: the ring main unit interval unit judges whether fault current flows through the local ring main unit interval unit according to the primary loop current detected by the DTU, and when fault current flows through the local ring main unit interval unit, fault information is sent to an upstream ring main unit interval unit; when no fault current flows, no fault information is sent to an interval unit of an upstream ring main unit; and the downstream feeder section of the ring main unit interval unit which does not receive the downstream fault information is a fault section, and the ring main unit interval unit which does not receive the downstream fault information sends fault section information to the downstream ring main unit, so that the fault location of the power distribution network is realized.
5. The fault location method for the intelligent power distribution network according to claim 4, wherein: the ring main unit interval unit has an automatic fault-tolerant function on the fault current of the missed detection, when the local ring main unit interval unit flows through the fault current and the local ring main unit interval unit does not detect the fault current, but the downstream ring main unit interval unit detects the fault current and sends fault information to the local ring main unit interval unit, the local ring main unit interval unit judges that the missed detection occurs, judges that the fault current of the local ring main unit interval unit flows through, and sends the fault information to the upstream ring main unit interval unit, so that the fault-tolerant function of the missed detection is realized.
6. The fault location method for the intelligent power distribution network according to claim 4, wherein:
when the local intelligent ring main unit is a circuit breaker, the ring main unit interval unit sends fault information to an upstream ring main unit interval unit after detecting fault current, and simultaneously sends a brake-separating and locking command;
when the local intelligent ring main unit is a load switch cabinet, the ring main unit interval unit does not send fault information to the upstream ring main unit interval unit after detecting the fault current;
no matter the local intelligent ring main unit is a circuit breaker cabinet or a load switch cabinet, after the ring main unit interval unit receives the opening and locking command of the downstream ring main unit interval unit, the opening and locking command is sent to the upstream ring main unit interval unit.
7. The fault location method for the intelligent power distribution network according to claim 4, wherein:
when the local intelligent ring main unit is a circuit breaker main unit, the ring main unit interval unit of the circuit breaker main unit sends a tripping command to the local circuit breaker to trip off the local switch to realize fault isolation when the ring main unit interval unit detects fault current and does not receive a downstream ring main unit separating brake and locking command;
when the local intelligent ring main unit is a load switch cabinet, when the ring main unit interval unit of the load switch cabinet detects fault current, the tripping command is not executed, and tripping is performed when no voltage or current is detected, so that fault isolation is realized.
8. The fault location method for the intelligent power distribution network according to claim 4, wherein: when the local intelligent ring main unit is a circuit breaker unit, after the ring main unit interval unit executes a tripping command, if the local ring main unit interval unit detects a fault and receives fault information of a downstream ring main unit interval unit, reclosing is executed after a certain time delay, the circuit breaker is reclosed, and otherwise, reclosing is not executed;
when the local intelligent ring main unit is a load switch cabinet, after the voltage is detected by the ring main unit interval unit and fault information of the downstream unit is received during fault, a closing command is executed, and closing is performed again, otherwise, the closing command is not executed, so that fault recovery of the upstream of a fault section is realized.
9. The fault location method for the intelligent power distribution network according to claim 4, wherein: when the ring main unit interval unit at the downstream of the fault section sends a closing command to the connection switch cabinet unit connected with the feeder line, closing is executed; and when the voltage is detected by the ring main unit interval unit between the downstream ring main unit interval unit of the fault section and the interconnection switch cabinet unit, closing is executed, and the fault recovery of the downstream of the fault section is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010336591.5A CN111431057A (en) | 2020-04-26 | 2020-04-26 | Integrated intelligent ring main unit system, intelligent power distribution network and fault positioning method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010336591.5A CN111431057A (en) | 2020-04-26 | 2020-04-26 | Integrated intelligent ring main unit system, intelligent power distribution network and fault positioning method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111431057A true CN111431057A (en) | 2020-07-17 |
Family
ID=71556810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010336591.5A Pending CN111431057A (en) | 2020-04-26 | 2020-04-26 | Integrated intelligent ring main unit system, intelligent power distribution network and fault positioning method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111431057A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113923615A (en) * | 2021-10-12 | 2022-01-11 | 四川九州电子科技股份有限公司 | Automatic 5G DTU fault recovery method in Internet of things |
| CN114123485A (en) * | 2021-10-09 | 2022-03-01 | 珠海万力达电气自动化有限公司 | Novel distributed distribution network terminal device and fault recovery method thereof |
| CN114142447A (en) * | 2021-11-26 | 2022-03-04 | 贵州电网有限责任公司 | Method for realizing automatic power supply transfer of incomplete configuration intelligent distributed system |
| CN114236263A (en) * | 2021-11-12 | 2022-03-25 | 国网浙江省电力有限公司平湖市供电公司 | Networking looped netowrk cabinet fault indication system based on redundancy technique |
| CN116388185A (en) * | 2023-06-05 | 2023-07-04 | 昆明理工大学 | Active power distribution network fault processing and rapid self-healing method and system |
| CN117559661A (en) * | 2024-01-10 | 2024-02-13 | 共鸿电器有限公司 | Method, equipment and medium for fault breaking control of draw-out type switch cabinet |
| CN117826007A (en) * | 2024-03-06 | 2024-04-05 | 三峡金沙江川云水电开发有限公司 | Ring network fault detection system and method for direct current system |
-
2020
- 2020-04-26 CN CN202010336591.5A patent/CN111431057A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114123485A (en) * | 2021-10-09 | 2022-03-01 | 珠海万力达电气自动化有限公司 | Novel distributed distribution network terminal device and fault recovery method thereof |
| CN113923615A (en) * | 2021-10-12 | 2022-01-11 | 四川九州电子科技股份有限公司 | Automatic 5G DTU fault recovery method in Internet of things |
| CN113923615B (en) * | 2021-10-12 | 2023-06-02 | 四川九州电子科技股份有限公司 | Automatic recovery method for 5G DTU fault in Internet of things |
| CN114236263A (en) * | 2021-11-12 | 2022-03-25 | 国网浙江省电力有限公司平湖市供电公司 | Networking looped netowrk cabinet fault indication system based on redundancy technique |
| CN114142447A (en) * | 2021-11-26 | 2022-03-04 | 贵州电网有限责任公司 | Method for realizing automatic power supply transfer of incomplete configuration intelligent distributed system |
| CN114142447B (en) * | 2021-11-26 | 2023-11-28 | 贵州电网有限责任公司 | Method for realizing automatic power transfer of incompletely configured intelligent distributed system |
| CN116388185A (en) * | 2023-06-05 | 2023-07-04 | 昆明理工大学 | Active power distribution network fault processing and rapid self-healing method and system |
| CN116388185B (en) * | 2023-06-05 | 2023-09-12 | 昆明理工大学 | Active power distribution network fault processing and rapid self-healing method and system |
| CN117559661A (en) * | 2024-01-10 | 2024-02-13 | 共鸿电器有限公司 | Method, equipment and medium for fault breaking control of draw-out type switch cabinet |
| CN117559661B (en) * | 2024-01-10 | 2024-03-29 | 共鸿电器有限公司 | Method, equipment and medium for fault breaking control of draw-out type switch cabinet |
| CN117826007A (en) * | 2024-03-06 | 2024-04-05 | 三峡金沙江川云水电开发有限公司 | Ring network fault detection system and method for direct current system |
| CN117826007B (en) * | 2024-03-06 | 2024-05-17 | 三峡金沙江川云水电开发有限公司 | Ring network fault detection system and method for direct current system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111431057A (en) | Integrated intelligent ring main unit system, intelligent power distribution network and fault positioning method | |
| CN102270836B (en) | Wide-area over-current protection method and system for power distribution network | |
| WO2021139071A1 (en) | Smart outdoor switch cabinet, and closed-loop i-shaped power distribution network for same | |
| CN107069676A (en) | Power distribution network fault positioning and rapid isolation recovery control method | |
| CN103022994B (en) | Method for achieving fault isolation and recovery of power distribution network with permeability distribution type power supply | |
| CN110148930B (en) | Method for fault location and automatic topology identification in power distribution network | |
| CN102611082B (en) | Self-adaptive feeder neighborhood interactive fault-tolerant relay protection method for power distribution network | |
| CN105548801B (en) | Fault Locating Method suitable for power distribution network operation with closed ring | |
| CN108321774B (en) | A kind of distribution automation controls on the spot and central controlled combined optimization method | |
| CN101673965A (en) | Automatic switching control method for wide-area emergency power source of electric power system | |
| CN113346460A (en) | Regional backup protection method and system suitable for petal type power distribution network | |
| CN104319743B (en) | The method and apparatus of the main transformer high-pressure side Fast Operating Backup Protection based on station domain information | |
| CN209748268U (en) | intelligent traction substation area protection device | |
| CN212258111U (en) | Integrated intelligent ring main unit system and intelligent power distribution network | |
| CN113013851B (en) | Distributed intelligent power distribution automation system | |
| CN102005819A (en) | Fault isolation method of electric distribution network | |
| CN111817353B (en) | Power distribution network equipment fault processing method | |
| CN104701823A (en) | Networking intelligent switch protection system for feeders of power distribution networks | |
| CN110635562A (en) | Self-adaptive area spare power automatic switching device and self-adaptive area spare power automatic switching method | |
| CN107611939B (en) | Regional power supply looped network fault quick isolation and load transfer method | |
| CN202679073U (en) | HP-9000 type switching station fault processing system | |
| CN114784768A (en) | Over-current protection method for rail transit bidirectional power supply system | |
| CN201860172U (en) | Automatic looped network type distribution network based on reclosers | |
| CN111786383B (en) | Spare power automatic switching device and method for realizing mutual backup of multiple power incoming lines | |
| Zhou et al. | Research on Quick Distributed Feeder Automation for Fast Fault Isolation/Self-healing in Distribution Network |
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 |