CN110703042A - Low-voltage transformer district circuit fault positioning system based on intelligent circuit breaker - Google Patents
Low-voltage transformer district circuit fault positioning system based on intelligent circuit breaker Download PDFInfo
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- CN110703042A CN110703042A CN201911018817.0A CN201911018817A CN110703042A CN 110703042 A CN110703042 A CN 110703042A CN 201911018817 A CN201911018817 A CN 201911018817A CN 110703042 A CN110703042 A CN 110703042A
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- fault
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- circuit breaker
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The invention provides a low-voltage transformer area line fault positioning system based on an intelligent circuit breaker, which comprises a low-voltage transformer area power distribution network and a monitoring center, wherein the monitoring center is connected with the low-voltage transformer area power distribution network; the intelligent circuit breaker has selectivity when meeting electrical faults, and can freely set tripping time or select different tripping times; the intelligent circuit breakers are used for setting the local-level circuit breaker close to a fault point to preferentially trip and open the brake when a line fault occurs between the two levels of intelligent circuit breakers, and sending fault information to the monitoring center; the monitoring center is used for acquiring fault point information through the intelligent distribution transformer terminal TTU, sending an instruction to control the upper and lower intelligent circuit breakers of the fault point to be switched off, and simultaneously controlling the connection switch to be switched on to supply power to a fault-free area and isolate the fault area. The invention can realize the fault location of the distribution line of the national power grid public transformer area, isolate the fault point of the area, recover power supply outside the isolated area, improve the fault response speed, minimize the fault influence, reasonably put the equipment into operation and reduce the equipment loss.
Description
Technical Field
The invention belongs to the technical field of power equipment, and particularly relates to a low-voltage transformer area line fault positioning system based on an intelligent circuit breaker.
Background
Along with the development of society, the electric wire netting lays the scope more and more extensively, and the difficult problem that the grid fault is frequent complicated, and when the electric wire netting broke down, the monitoring center can only know the grid fault according to resident or the feedback of power consumption unit, can not know the fault condition in time, influences the reliability of power supply to if the grid fault only relies on artifical investigation one by one, maintenance, work load is too big.
At present, the line fault positioning technology of the medium-voltage side and the high-voltage side is mature, but the low-voltage side is in a blank state, all lines are powered off after a fault occurs, the influence is very large, the reaction time is slow after the fault occurs, and the fault condition can be mastered only by waiting for reporting the field condition.
In view of this, a method capable of detecting a low-voltage power grid fault is urgently needed, and the method can send fault information to a monitoring center in time, and can perform self-study and judgment according to a control command sent by the monitoring center, so as to achieve the purposes of intelligent detection and intelligent control.
Disclosure of Invention
The invention aims to provide a low-voltage transformer area line fault positioning system based on an intelligent circuit breaker, so as to solve the technical problem.
The invention provides a low-voltage transformer area line fault positioning system based on intelligent circuit breakers, which comprises a low-voltage transformer area distribution network and a monitoring center, wherein the low-voltage transformer area distribution network comprises a plurality of distribution transformers, each distribution transformer is connected with at least one branch line, the branch line is provided with a plurality of intelligent circuit breakers, and the tail ends of the branch lines are connected through interconnection switches;
each intelligent circuit breaker is connected with a topology recognition device LTU, and the topology recognition device LTU is used for reading current and voltage information acquired by the intelligent circuit breaker, obtaining physical position and hierarchical relation information of each node through analysis and calculation, and reporting the information to the monitoring center;
the intelligent circuit breaker has the functions of overload protection, short-circuit protection, leakage protection, overvoltage/undervoltage protection, over-temperature protection, fault alarm and remote control on-off; the intelligent circuit breaker has selectivity when encountering electrical faults, and can freely set tripping time or select different tripping times;
the intelligent circuit breakers are used for setting the circuit breaker of the current level close to a fault point to be tripped and separated when a line fault occurs between the intelligent circuit breakers of the two levels, and sending fault information to the monitoring center;
the monitoring center is used for acquiring fault point information through the TTU, sending an instruction to control the opening of the upper and lower intelligent circuit breakers of the fault point, and meanwhile controlling the connection switch to be switched on, supplying power to a fault-free area and isolating the fault area.
Further, the topology identification device LTU is electrically connected with the intelligent circuit breaker through RS 485.
Furthermore, a dual-power automatic transfer switch is arranged between the two distribution transformers and used for automatically switching a power supply to another distribution transformer when a certain distribution transformer fails so as to normally supply power to a power grid.
Compared with the prior art, the invention has the beneficial effects that:
the invention can realize the fault location of the distribution line of the national power grid public transformer area, isolate the fault point of the area, recover power supply outside the isolated area, improve the fault response speed, minimize the fault influence, reasonably put the equipment into operation and reduce the equipment loss.
Drawings
Fig. 1 is a schematic structural diagram of a low-voltage transformer area line fault positioning system based on an intelligent circuit breaker;
FIG. 2 is a schematic diagram of a fault condition in an embodiment of the invention;
fig. 3 is a schematic diagram of a fault condition two in the embodiment of the present invention.
Detailed Description
The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that functional, methodological, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.
Referring to fig. 1, the embodiment provides a low-voltage transformer area line fault positioning system based on an intelligent circuit breaker, which specifically includes a low-voltage transformer area distribution network composed of a distribution transformer 1, a distribution transformer 2, first to ninth intelligent circuit breakers 1 to 9, first to ninth topology identification devices LTU1 to LTU9, a dual-power automatic transfer switch, a first interconnection switch 1, a second interconnection switch 2, and a third interconnection switch 3. The first topology identification device LTU1 to the ninth topology identification device LTU9 are electrically connected with the first intelligent circuit breaker 1 to the ninth intelligent circuit breaker 9 through RS485 respectively, current and voltage information acquired by the first intelligent circuit breaker 1 to the ninth intelligent circuit breaker 9 is read, physical positions and hierarchical relations of nodes are obtained through analysis and calculation, outgoing lines, line branch structures and hierarchical relations of all lines of the whole low-voltage distribution network are displayed, automatic identification of physical topology of the low-voltage distribution network is achieved, data are reported finally, the data are reported to a monitoring center through an intelligent distribution terminal TTU of a power grid department, and visualization of the topology structure is achieved in the monitoring center.
In the figure, only 2 distribution transformers, 9 intelligent circuit breakers, 9 topology recognition devices LTU, 3 interconnection switches and 1 dual-power automatic transfer switch are shown. In theory, the power equipment can be infinitely expanded. The invention still belongs to the protection scope of the invention without changing the idea of the invention.
Referring to fig. 2, the first to ninth intelligent circuit breakers 1 to 9 are all intelligent circuit breakers having functions of overload protection, short-circuit protection, leakage protection, overvoltage/undervoltage protection, over-temperature protection, fault alarm, and remote control switching on and off. In addition, the first to ninth smart breakers 1 to 9 are selective breakers, and trip times may be freely set or breakers of different trip times may be selected. When a line breaks down, the tripping time of the circuit breaker close to a fault point is shorter than that of the circuit breaker far away from the fault point, so that the circuit breaker of the current level is tripped preferentially, and the circuit breaker is prevented from tripping and separating. For example, when the fault point 1 occurs between the fifth intelligent circuit breaker 5 and the sixth intelligent circuit breaker 6, since the trip time of the fifth intelligent circuit breaker 5 is shorter than the trip time of the fourth intelligent circuit breaker 4, the fifth intelligent circuit breaker 5 is preferentially opened, and the fourth intelligent circuit breaker 4 is not opened when the trip time is long. After the fifth intelligent circuit breaker 5 is opened, fault information is reported to a monitoring center through an intelligent distribution transformer terminal TTU, and the monitoring center remotely opens the fifth intelligent circuit breaker 5 and the sixth intelligent circuit breaker 6 through remote operation to ensure that the fifth intelligent circuit breaker 5 completely processes an opening state; meanwhile, the interconnection switch 1 and the interconnection switch 2 are switched on, and the load equipment of the fourth intelligent circuit breaker 4 and the load equipment of the sixth intelligent circuit breaker 6 still normally supply power at the moment. The fault location of the distribution line of the low-voltage power grid public transformation station area is realized through the principle, the fault point 1 of the station area is isolated, and the power can be normally supplied outside the isolation area.
When the fault point 1 occurs elsewhere, the operating principle is still in accordance with the method described above.
Referring to fig. 3, when one of the distribution transformer 1 or the distribution transformer 2 fails, the dual power automatic transfer switch can be rapidly switched to the other distribution transformer to supply power, and the two transformers are mutually primary and standby, so that normal power supply is realized when the transformer side fails. For example, when the distribution transformer 2 has the fault point 2, the dual-power automatic transfer switch is quickly switched to the distribution transformer 1, and at the moment, the distribution transformer 1 supplies power to the power grid normally, so that the power grid operates normally, and meanwhile, the distribution transformer 2 is subjected to fault maintenance. After the fault is eliminated, the distribution transformer 1 and the distribution transformer 2 are main and standby distribution transformers.
By the low-voltage transformer area line fault positioning system, when a line fault occurs between two levels of intelligent circuit breakers, the circuit breaker close to a fault point is preferentially tripped and separated, and fault information is reported. The monitoring center obtains fault point information through the intelligent distribution transformer terminal TTU, researches and judges the fault point, sends out instructions to control the upper and lower intelligent circuit breakers of the fault point to be switched off, and simultaneously switches on the interconnection switch to supply power to a fault-free area so as to realize fault area isolation.
When the main power supply distribution transformer fails, the dual-power automatic transfer switch rapidly switches the circuit, the main power supply distribution transformer is disconnected, and the other standby power supply distribution transformer is connected for power supply. The two transformers are mutually used as main and standby transformers, and normal electricity utilization can be achieved when the transformer side fails.
The low-voltage transformer area line fault positioning system is used for urban public transformer substations and can ensure the stability of power consumption of users. The urban power demand is high in stability, the power of shops, office buildings and the like cannot be cut off for a long time, and normal power utilization of users outside a fault area can be guaranteed through the system. In addition, the system can also be used for a special transformer to reduce the area of the electric paralysis and reduce the loss; the intelligent circuit breaker terminal is deployed in the low-voltage transformer area, the JP cabinet, each branch box and the household meter box, so that the fault quick feedback of the branch line can be realized, the fault can be automatically isolated, and the influence is reduced to the minimum.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (3)
1. A low-voltage transformer area line fault positioning system based on intelligent circuit breakers is characterized by comprising a low-voltage transformer area distribution network and a monitoring center, wherein the low-voltage transformer area distribution network comprises a plurality of distribution transformers, each distribution transformer is connected with at least one branch line, the branch lines are provided with a plurality of intelligent circuit breakers, and the tail ends of the branch lines are connected through interconnection switches;
each intelligent circuit breaker is connected with a topology recognition device LTU, and the topology recognition device LTU is used for reading current and voltage information acquired by the intelligent circuit breaker, obtaining physical position and hierarchical relation information of each node through analysis and calculation, and reporting the information to the monitoring center;
the intelligent circuit breaker has the functions of overload protection, short-circuit protection, leakage protection, overvoltage/undervoltage protection, over-temperature protection, fault alarm and remote control on-off; the intelligent circuit breaker has selectivity when encountering electrical faults, and can freely set tripping time or select different tripping times;
the intelligent circuit breakers are used for setting the circuit breaker of the current level close to a fault point to be tripped and separated when a line fault occurs between the intelligent circuit breakers of the two levels, and sending fault information to the monitoring center;
the monitoring center is used for acquiring fault point information through the TTU, sending an instruction to control the opening of the upper and lower intelligent circuit breakers of the fault point, and meanwhile controlling the connection switch to be switched on, supplying power to a fault-free area and isolating the fault area.
2. A low voltage transformer district line fault location system based on intelligent circuit breakers according to claim 1, characterized in that the topology identification means LTU is electrically connected to the intelligent circuit breaker by RS 485.
3. The system for locating line faults in a low-voltage transformer area based on an intelligent circuit breaker as claimed in claim 1, wherein a dual power automatic transfer switch is arranged between two distribution transformers and used for automatically switching a power supply to another distribution transformer when a certain distribution transformer fails so as to supply power to a power grid normally.
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| CN201911018817.0A CN110703042A (en) | 2019-10-24 | 2019-10-24 | Low-voltage transformer district circuit fault positioning system based on intelligent circuit breaker |
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| CN201911018817.0A CN110703042A (en) | 2019-10-24 | 2019-10-24 | Low-voltage transformer district circuit fault positioning system based on intelligent circuit breaker |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111342427A (en) * | 2020-02-28 | 2020-06-26 | 上海良信电器股份有限公司 | Topology identification method of circuit breaker and circuit breaker |
| CN111371063A (en) * | 2020-02-28 | 2020-07-03 | 上海良信电器股份有限公司 | Circuit breaker, and method and device for automatically adapting to topological signals |
| CN112162174A (en) * | 2020-09-03 | 2021-01-01 | 国电南瑞科技股份有限公司 | Distribution room fault positioning method and system based on marketing and distribution integration |
| CN112421614A (en) * | 2020-11-05 | 2021-02-26 | 江苏其厚智能电气设备有限公司 | Power distribution station self-healing control system and method based on local communication and topology identification |
| CN112952998A (en) * | 2021-01-19 | 2021-06-11 | 贵州电网有限责任公司 | Distribution network circuit fault positioning protection method based on transformer metering technology |
| CN113285432A (en) * | 2021-07-26 | 2021-08-20 | 广东电网有限责任公司东莞供电局 | Automatic device and protection method for relay protection of power system |
| CN114184888A (en) * | 2021-11-30 | 2022-03-15 | 贵州电网有限责任公司 | Fault positioning method for dual-power supply line |
| CN114256819A (en) * | 2021-12-21 | 2022-03-29 | 青岛鼎信通讯股份有限公司 | Terminal-based self-healing control method for transformer area |
| CN115102144A (en) * | 2022-08-25 | 2022-09-23 | 长春工程学院 | Small current grounding system fault protection device and method |
| CN116937488A (en) * | 2023-09-19 | 2023-10-24 | 青岛鼎信通讯科技有限公司 | Intelligent circuit breaker system and fault processing method for power distribution network |
| CN112162174B (en) * | 2020-09-03 | 2024-04-26 | 国电南瑞科技股份有限公司 | Station area fault positioning method and system based on marketing and distribution integration |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111371063B (en) * | 2020-02-28 | 2022-06-03 | 上海良信电器股份有限公司 | Circuit breaker, and method and device for automatically adapting to topological signals |
| CN111371063A (en) * | 2020-02-28 | 2020-07-03 | 上海良信电器股份有限公司 | Circuit breaker, and method and device for automatically adapting to topological signals |
| CN111342427A (en) * | 2020-02-28 | 2020-06-26 | 上海良信电器股份有限公司 | Topology identification method of circuit breaker and circuit breaker |
| CN111342427B (en) * | 2020-02-28 | 2022-08-02 | 上海良信电器股份有限公司 | Topology identification method of circuit breaker and circuit breaker |
| CN112162174A (en) * | 2020-09-03 | 2021-01-01 | 国电南瑞科技股份有限公司 | Distribution room fault positioning method and system based on marketing and distribution integration |
| CN112162174B (en) * | 2020-09-03 | 2024-04-26 | 国电南瑞科技股份有限公司 | Station area fault positioning method and system based on marketing and distribution integration |
| CN112421614A (en) * | 2020-11-05 | 2021-02-26 | 江苏其厚智能电气设备有限公司 | Power distribution station self-healing control system and method based on local communication and topology identification |
| CN112952998A (en) * | 2021-01-19 | 2021-06-11 | 贵州电网有限责任公司 | Distribution network circuit fault positioning protection method based on transformer metering technology |
| CN112952998B (en) * | 2021-01-19 | 2023-05-16 | 贵州电网有限责任公司 | Distribution network circuit fault positioning protection method based on station transformer metering technology |
| CN113285432A (en) * | 2021-07-26 | 2021-08-20 | 广东电网有限责任公司东莞供电局 | Automatic device and protection method for relay protection of power system |
| CN114184888A (en) * | 2021-11-30 | 2022-03-15 | 贵州电网有限责任公司 | Fault positioning method for dual-power supply line |
| CN114256819A (en) * | 2021-12-21 | 2022-03-29 | 青岛鼎信通讯股份有限公司 | Terminal-based self-healing control method for transformer area |
| CN114256819B (en) * | 2021-12-21 | 2023-08-08 | 青岛鼎信通讯股份有限公司 | Terminal-based self-healing control method for platform area |
| CN115102144A (en) * | 2022-08-25 | 2022-09-23 | 长春工程学院 | Small current grounding system fault protection device and method |
| CN115102144B (en) * | 2022-08-25 | 2022-11-11 | 长春工程学院 | Small current grounding system fault protection device and method |
| CN116937488A (en) * | 2023-09-19 | 2023-10-24 | 青岛鼎信通讯科技有限公司 | Intelligent circuit breaker system and fault processing method for power distribution network |
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Application publication date: 20200117 |