CN112271711A - Distributed fault protection method and device for transformer substation - Google Patents
Distributed fault protection method and device for transformer substation Download PDFInfo
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
- H02J13/00017—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus using optical fiber
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00019—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using optical means
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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
- 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
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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
- Y04S10/16—Electric power substations
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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
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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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
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
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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
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
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- Engineering & Computer Science (AREA)
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- Computer Networks & Wireless Communication (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention relates to a distributed fault protection method and a distributed fault protection device for a transformer substation.
Description
Technical Field
The invention relates to the field related to substation fault monitoring, in particular to a distributed fault protection method and device for a substation.
Background
With the continuous construction of power distribution networks, the problems of numerous types, wide distribution range and the like of the power distribution automation terminals, numerous versions of terminal communication protocols, poor compatibility, complex operation and maintenance work and the like are gradually highlighted; at present, when equipment is maintained, manual judgment can be carried out only through field investigation afterwards, the skill level and the maintenance experience of personnel are mainly relied on, a maintenance aid decision-making technology is lacked, and a scientific basis is provided for making a correct and effective maintenance scheme.
The intelligent distribution is decentralized, and the intelligent terminals of the ring network switches make decisions without intervention of a master station, so that fault location, isolation and power restoration of the distribution line are cooperatively completed. The current mainstream technology is that fault detection information is exchanged between intelligent terminals of adjacent switches to realize the positioning and isolation of a fault section; and the intelligent terminal at the interconnection switch makes a power supply recovery decision and control on a non-fault section downstream of the fault point. Intelligent distributed feeder automation is also called network protection. Each switch for executing the strategy is required to be in the same ring network line, and only one interconnection switch is required, namely the simplest single ring network connection is realized. Because the management requirement of a transformer substation is greatly different from that of a distribution network, a transformer substation switch is difficult to communicate with a line switch and execute a network protection strategy, so that the first switch on a line is often used as a first switch in the intelligent distribution mode, and the first switch and other switches behind the first switch form a domain which can communicate with each other and execute the same strategy.
Disclosure of Invention
Based on the above situation in the prior art, the invention aims to provide a distributed fault protection method and device for a transformer substation aiming at an intelligent distributed transformer substation, so as to realize decentralization of the transformer substation, realize rapid fault positioning, isolation and power supply switching of the transformer substation, and greatly improve the fault response speed and accuracy of the intelligent distributed transformer substation.
In order to achieve the above object, according to an aspect of the present invention, there is provided a substation distributed fault protection method, including the steps of:
a plurality of switches and interval units corresponding to the switches are configured in each switch station;
when a line has a fault, an interval unit corresponding to a fault point switch detects fault information and sends a switch control action signal;
transmitting the fault information to a corresponding switch interval unit of a next-stage switch station until the interval unit of the switch is communicated;
and the interconnection switch carries out switching-on power supply or switching-off switching-on operation according to the transmitted fault information.
Further, the faults comprise substation outlet faults, bus faults in the switching station, line faults between the switching stations, boundary line faults and line faults near a contact point.
Furthermore, when the outgoing line fault of the transformer substation occurs, the first switch loses voltage and delays opening, and fault isolation is triggered.
Further, when a bus fault occurs in the switchyard, the corresponding section switch in the switchyard is tripped in an overcurrent mode.
Furthermore, when a line fault occurs between the switching stations, the difference current of the corresponding sectional switch in each of the two adjacent switching stations trips.
Furthermore, when a demarcation line fault occurs, the sectional switches in the corresponding switch stations automatically isolate the fault.
Further, when a line fault occurs near the tie point, the sectionalizing switches and tie switches in the adjacent switchyard are differential-current tripped.
Furthermore, when the outgoing line fault of the transformer substation, the bus fault in the switching station and the line fault between the switching stations occur, the interconnection switch performs switching on and switching off power supply.
Further, when a line fault near the interconnection point occurs, the interconnection switch performs closing and locking operations.
According to another aspect of the invention, the distributed fault protection device for the transformer substation is provided, and comprises a configuration module, a switch action control module, a fault information transmission module and a power conversion and supply control module; the configuration module configures a plurality of switches and interval units corresponding to the switches for each switching station;
when a line fails, the switch action control module detects fault information by the interval unit corresponding to the fault point switch and sends a switch control action signal;
the fault information transmission module transmits the fault information to a corresponding switch interval unit of a next-stage switch station until the fault information is communicated with the interval unit of the switch;
and the switching power supply control module controls the interconnection switch to carry out switching on and switching off power supply or switching off and switching on operation according to the transmitted fault information.
In summary, the distributed fault protection method and device for the transformer substation provided by the invention have the advantages that the interval units corresponding to the switches are configured in each switch station, the fault closing control of the switches and the transmission of fault information between the switch stations are realized through the interval units, the decentralization of the transformer substation is realized, the rapid fault positioning, isolation and power supply switching of the transformer substation are realized, and the fault response speed and accuracy of the intelligent distributed transformer substation are greatly improved.
Drawings
Fig. 1 is a total station equipment deployment overall architecture diagram of an intelligent distributed power station;
FIG. 2 is a flow chart of a distributed fault protection method of a substation of the present invention;
fig. 3 is a schematic diagram of the intelligent distributed fault isolation and power restoration circuit of the present invention.
Fig. 4 is a schematic overall configuration diagram of the substation distributed fault protection device of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Fig. 1 shows an overall architecture diagram of a total station deployment of an intelligent distributed power station, which generally takes a first switch on a line as a head switch, and the head switch and other switches behind the head switch form a domain which can communicate with each other and execute the same strategy. In each switch station, a spacing unit is arranged for each switch, the ring main unit ring network incoming and outgoing line switch spacing unit of each switch station is connected with an adjacent station by adopting optical fibers to realize optical fiber differential protection, a station terminal in the switch station is connected to a switch by adopting Ethernet, bus intelligent distribution logic judgment is carried out by adopting a peer-to-peer communication mode, regional autonomy is realized, and a control command is issued to realize bus protection and power supply recovery. The fault protection types of the transformer substation comprise optical difference protection, bus protection and surface protection. The optical differential protection is a line protection between two points, and protects the whole length of a line. The surface protection is to judge the fault section according to the fault information of a plurality of switches in the network. The bus protection needs the matching of fault information of a plurality of switch points at a bus outlet in the switch cabinet, and the insulation is carried out by the surface protection with a plurality of points and variable points. The surface protection is an intelligent distributed mode, an intelligent distributed Goose release subscription mode of a south network MN side discrimination method is completely adopted, and originally, each section switch needs to be configured with a left-side switch signal and a right-side switch signal to determine whether a fault point is on the left side or the right side of the section switch. And an optical difference intelligent distribution mode is adopted, each section switch only needs to be configured into a first switch mode (only needs to be configured with M or N single side), and because the first switch only communicates with a lower switch, only the single side fault of the switch needs to be judged, the other side of the original south network intelligent distribution mode is given to the tripping-back first switch of the transformer substation to be subjected to voltage-loss brake-separating, and the other side is completely given to optical difference protection to complete the removal and isolation. The sectional switch determines a fault section by collecting 'node fault' information of other sectional switches in the single-side switch cabinet. Such as: detecting self faults and receiving fault information of a sectional switch node, wherein the faults are not outside the switch station; if only self faults are detected, the switch is considered as a preceding stage of a fault point of a bus in the switching station, and overcurrent tripping of the switch is carried out; if only one-side overcurrent is detected, the switch is considered to be the rear stage of a bus fault point in the switching station, and the switch is isolated and jumped. For the power supply recovery operation requiring reverse power supply by other stations, the power supply needs to be transmitted through an optical fiber between the switching stations: two signals of switch tripping rejection and fault isolation success are transmitted in a Goose communication message in the switch station: node failure, switch bounce rejection, failure isolation success and node locking.
Besides transmitting sampling point signals for judging faults, the optical fiber also needs to transmit intelligent distribution digital signals for the whole line. The method is used for intelligent distributed logic signal transmission between stations. Used for transmitting the information of 'switch actuation' and 'fault isolation success' of adjacent switchyard. If a switch-according-motion signal of an adjacent switch station is received, the section switch connected with the adjacent station and the local station needs to be tripped off, so that large-area power failure caused by protection failure is reduced. And if the fault isolation success signal is received, the signal is forwarded until the signal is forwarded to the interconnection switch, and the closing is informed to recover power supply. The interval unit performs line protection (single line) and intelligent distribution in the cabinet performs area protection (interval unit signals perform logic judgment).
1. Fault location
The minimum communication quantity is met, and each switch on the line can judge the fault section only by communicating with the left and right adjacent switches. Through communication between the switches, the fault current + the fault current on two adjacent sides- > is not in the protection section of the switch, the protection does not act, and only the backup mode is started. The current of the switch is + the current of the adjacent two switches is only one side of the switch- > the fault is in the protection section of the switch; no fault current of the switch, only one side of the adjacent two-side switch has fault current, and the fault is in an isolation section of the switch.
2. Fault isolation
After the fault is positioned, the switches on the two sides of the fault point respectively start a fault removal program and an isolation program, and an upstream switch of the fault point trips to send a fault removal success mark; trip of the downstream switch at the fault point-a transfer power request is issued.
3. Transfer power supply
And the interconnection switch receives the power supply transfer request, starts a power supply transfer program, namely, switches on the switch, and completes power supply transfer.
The communication between the switches and the left and right adjacent switches solves the problem of local distributed fault location and isolation, the total duration of the whole program is formed by the communication time, the intelligent terminal program calculation time and the opening time of the breaker, the conventional equipment can be basically completed within 200 milliseconds, if the quick-break setting time of the substation outlet switch is 300 milliseconds, the substation outlet switch does not operate, the fault of the line is isolated, the upstream area of the line fault point can be uninterrupted, the power supply of the downstream area is recovered within hundreds of milliseconds, and other users hardly feel the fault, except the fault area, the fault is removed and isolated. Therefore, the power supply reliability is very high, reaching the millisecond level. Such feeder automation is often called intelligent distributed fast-moving. If the section switch of the line adopts a load switch, the logic needs to wait for the tripping of the substation outlet breaker and then execute the strategy, the network reconstruction is carried out after the switch is detected to be non-voltage, the reconstruction time is not different from the quick-acting type, and the substation outlet breaker is reclosed after waiting for several seconds to recover the line power supply. The strategy is generally called as an intelligent distributed slow-moving type, also called as a 'cooperation type', and 'one-time reclosing based on peer-to-peer communication', and the like, and the basic principles are consistent. The power supply reliability of the automation strategy is also high, in seconds.
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings. According to an embodiment of the present invention, there is provided a substation distributed fault protection method, a flowchart of which is shown in fig. 2, and the method includes the steps of:
a plurality of switches and interval units corresponding to the switches are configured in each switch station;
when a line has a fault, an interval unit corresponding to a fault point switch detects fault information and sends a switch control action signal;
transmitting the fault information to a corresponding switch interval unit of a next-stage switch station until the interval unit of the switch is communicated;
and the interconnection switch carries out switching-on power supply or switching-off switching-on operation according to the transmitted fault information.
The faults comprise substation outgoing line faults, bus faults in the switching station, line faults between the switching stations, boundary line faults and line faults near a contact point.
Fig. 3 shows a schematic diagram of a line for intelligent distributed fault isolation and power restoration, and details of various types of fault protection steps are described below with reference to fig. 3.
F1 substation outlet fault: the first switch CB201 is subjected to voltage loss and delay switching-off, a fault isolation success signal is triggered, and the signal is transmitted to a CB303 interconnection switch step by step to switch on and switch off power supply through an optical fiber signal and goes … …;
f2 bus fault in station: the CB102 interval unit detects a node fault signal, other nodes have no fault, the CB102 overcurrent trip and other section switches are isolated and tripped, the fault is isolated successfully through an optical fiber signal, and the Goose is switched, and … … is transmitted to the CB303 contact switch step by step to switch on and supply power.
F3 interstation line fault: the differential current signals detected by the optical difference of the DTU spacing units CB206 and CB207 automatically trip, and the fault isolation is successfully transmitted to the CB303 interconnection switch step by step through each step of switching Goose and … … to switch on and supply power.
F4 interstation line fault: similar to the F3 failure point.
F5 demarcation line fault: the DTU interval unit CB210 self-isolates the fault and sends a lockout signal to terminate the sectionalizing switch logic process.
Line fault near F6 contact point: the optical difference of the DTU interval units CB111 and CB304 detects that the differential current signal automatically trips, and the CB304 is positioned at a separation position and is a communication switch to be locked and closed.
According to another aspect of the invention, a substation distributed fault protection device is provided, and the overall composition schematic diagram of the substation distributed fault protection device is shown in fig. 4, and the fault protection device comprises a configuration module, a switch action control module, a fault information transmission module and a power supply conversion control module.
The configuration module is used for configuring a plurality of switches and interval units corresponding to the switches in each switch station;
when a line fails, the switch action control module detects fault information by the interval unit corresponding to the fault point switch and sends a switch control action signal;
the fault information transmission module transmits the fault information to a corresponding switch interval unit of a next-stage switch station until the fault information is communicated with the interval unit of the switch;
and the switching power supply control module controls the interconnection switch to carry out switching on and switching off power supply or switching off and switching on operation according to the transmitted fault information.
In summary, the invention relates to a distributed fault protection method and device for a transformer substation, wherein a spacing unit corresponding to a switch is configured in each switching station, fault closing control of the switch and transmission of fault information between the switching stations are realized through the spacing unit, decentralized of the transformer substation is realized, and rapid fault positioning, isolation and power supply switching of the transformer substation are realized, so that the fault response speed and accuracy of the intelligent distributed transformer substation are greatly improved.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. A distributed fault protection method for a transformer substation is characterized by comprising the following steps:
a plurality of switches and interval units corresponding to the switches are configured in each switch station;
when a line has a fault, an interval unit corresponding to a fault point switch detects fault information and sends a switch control action signal;
transmitting the fault information to a corresponding switch interval unit of a next-stage switch station until the interval unit of the switch is communicated;
and the interconnection switch carries out switching-on power supply or switching-off switching-on operation according to the transmitted fault information.
2. The fault protection method of claim 1, wherein the faults include substation outlet faults, bus faults within switchyard, line faults between switchyards, demarcation line faults, and line faults near a tie point.
3. The fault protection method according to claim 2, wherein when a substation outlet fault occurs, the first switch loses voltage and delays opening to trigger fault isolation.
4. A fault protection method according to claim 3, characterized in that when a bus fault occurs in a switchyard, the corresponding section switch in the switchyard is over-current tripped.
5. The fault protection method according to claim 4, wherein when a line fault between switching stations occurs, the respective corresponding sectionalizing switches in two adjacent switching stations are differential-current tripped.
6. The fault protection method of claim 5, wherein when a demarcation line fault occurs, a sectionalizer within a corresponding switchyard isolates the fault by itself.
7. The fault protection method of claim 6, wherein when a line fault occurs near a tie point, sectionalizing switches and tie switches in adjacent switchyards are differential tripped.
8. The fault protection method according to claim 7, wherein the interconnection switch performs switching on and switching off power supply when a substation outlet fault, a bus fault in a switching station, and a line fault between switching stations occur.
9. The fault protection method according to claim 8, wherein the tie switch performs a closing operation when a line fault near a tie point occurs.
10. A distributed fault protection device of a transformer substation is characterized by comprising a configuration module, a switch action control module, a fault information transmission module and a power conversion and supply control module; wherein the content of the first and second substances,
the configuration module is used for configuring a plurality of switches and interval units corresponding to the switches in each switch station;
when a line fails, the switch action control module detects fault information by the interval unit corresponding to the fault point switch and sends a switch control action signal;
the fault information transmission module transmits the fault information to a corresponding switch interval unit of a next-stage switch station until the fault information is communicated with the interval unit of the switch;
and the switching power supply control module controls the interconnection switch to carry out switching on and switching off power supply or switching off and switching on operation according to the transmitted fault information.
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