CN103151765B - Adaptive zero hour differential overcurrent protection method - Google Patents
Adaptive zero hour differential overcurrent protection method Download PDFInfo
- Publication number
- CN103151765B CN103151765B CN201310058237.0A CN201310058237A CN103151765B CN 103151765 B CN103151765 B CN 103151765B CN 201310058237 A CN201310058237 A CN 201310058237A CN 103151765 B CN103151765 B CN 103151765B
- Authority
- CN
- China
- Prior art keywords
- protective device
- higher level
- time limit
- adjacent
- adjacent protective
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of adaptive zero hour differential overcurrent protection method, it is characterized in that, for protective device each in electrical network arranges identical intrinsic time limit (t
i), by ethernet communication between each protective device; After certain protective device detects short circuit current, notify the adjacent protective device of higher level immediately, detect the notice whether had from the adjacent protective device of subordinate simultaneously; If have notice, then operation time limit is set as intrinsic time limit (t
i) add the scheduled time (Dt), to play backup protection effect; If do not have notice, then operation time limit is set as intrinsic time limit (t
i) to excise fault.Protective device has adaptive logic positioning function; after power network topology changes; each protective device communicates with the adjacent protective device of possible higher level of its internal record voluntarily; according to the state feeding back the adjacent protective device of higher level obtained; determine the adjacent protective device of the higher level of current reality; set up the superior and the subordinate's logical relation between each protective device thus, the change of Initial adaption power network topology.
Description
Technical field
The present invention relates to a kind of overcurrent protection method of electrical network, particularly a kind of adaptive zero hour differential overcurrent protection method.
Background technology
Power grid security, by many factors, breaks down unavoidably.When an error occurs, the exception generally along with electric current increases, and therefore overcurrent protection is that a kind of directly effective electric network fault detects and cutting method.Overcurrent protective device be a kind of starting current according to the protective device avoiding peak load operating current to adjust, it is inoperative when electrical network normally runs, and when a failure occurs it, can react on abnormal current and action.Generally, it can not only protect the total length of this circuit, can also protect the total length of adjacent lines, plays backup protection effect.
Traditional overcurrent protection method is time delay over-current protection, is first introduced it below.
The operation time limit of time delay over-current protection is adjusted according to optionally requiring.Optionally implication is: the fault in each section of line range should be excised by the protective device being responsible for this part of path in first action.For the single-side power radiation electric network shown in Fig. 1, work as d
1during point short circuit, protective device 1 ~ 5 all may start under the effect of short circuit current, but according to selectivity requirement, should only have protective device 1 action, excision fault, and protective device 2 ~ 5 should return immediately after failure removal.Selectivity requires by setting different operation time limits to realize for each protective device.
Protective device 1 is positioned at the least significant end of electrical network, as long as power consumption equipment breaks down, it just can instantaneous operation be excised, the t in Fig. 1
1for the intrinsic operate time of protective device itself.For higher level's protective device 2 of protective device 1, for ensureing d
1the selectivity of action during point short circuit, should adjust its operation time limit t
2>t
1.Introduce time delay Δ t, then the operation time limit of protective device 2 is
t
2=t
1+Δt
Work as d
2during point short circuit, protective device 2 will with t
2time limit excision fault, simultaneously for ensureing the selectivity of its higher level's protective device 3 action, must adjust again t
3>t
2, can establish
t
3=t
2+Δt
The rest may be inferred, protective device 4,5 ..., n operation time limit be respectively
t
4=t
3+Δt
t
5=t
4+Δt
t
n=t
n-1+Δt
The operation time limit of this protection and the size of short circuit current have nothing to do, and after adaptive setting, are ensured by the special time relay, are therefore called that time delay over-current is protected.Its shortcoming is that short circuit current is larger when fault is the closer to power end, and the time limit of protective device action excision fault is longer on the contrary.Intrinsic operation time limit as the circuit breaker of protective device is generally 0.2 ~ 0.3s, adds the operate time of other control apparatus, for ensureing the selectivity of protective device, and setting Δ t=0.5s.For electric network shown in Fig. 1, as the operation time limit t of protective device 1
1when being taken as 0.5s, the operation time limit t of protective device 2
2for 1s.The rest may be inferred, if during n=20, and operation time limit t
20for 10s, delayed 10s is namely needed to excise fault.So long short circuit current very easily damages protected power equipment, makes protective device lose protective effect.
For solving the problem; Normal practice is in electrical network, adopt three-stage protection device; namely adopt current quick-breaking and current quick-breaking of prescribing a time limit as the main protection of this circuit, to excise fault fast, and utilize overcurrent protection to be used as the backup protection of this circuit and neighbouring device.Although this protected mode solves time delay over-current protective device Problems existing, complex structure, the impact by power network wiring and power system operation mode is serious.Such as, its setting value must set by system maximum operational mode, and sensitivity then must adopt system minimum operational mode to verify, and this just makes it can not meet the requirement of sensitivity coefficient or protective device scope.
Summary of the invention
The object of the present invention is to provide a kind of adaptive zero hour differential overcurrent protection method; the method can make the protective device of electrical network least significant end identical with the operation time limit of the protective device near power end; and after power network topology changes; can when prosthetic be intervened; reconfigure voluntarily, set up the superior and the subordinate's logical relation between protective device.Both can avoid the shortcoming of time delay over-current protective device, reach again the effect of three-stage protection device, impair the dependency degree to power network wiring and power system operation mode simultaneously.
Adaptive zero hour differential overcurrent protection method of the present invention, comprises following steps:
(1) operation time limit of each protective device in electrical network is set to identical intrinsic time limit (t
i), there is communication connection between two adjacent protective devices;
(2) when protective device detects short circuit current; this protective device starts timing; and notify that the adjacent protective device of higher level has fault to occur; detect the corresponding notice whether had from the adjacent protective device of subordinate simultaneously; wherein; if the notice of the adjacent protective device of subordinate received by this protective device, then operation time limit is set as intrinsic time limit (t
i) add the scheduled time (Δ t); If do not had notice, then operation time limit is set as intrinsic time limit (t
i), and again notifying the adjacent protective device of higher level, fault occurs in the region of this protective device administration;
(3) receive higher level's protective device of again notifying using the backup protection equipment as this region, do not receive the protective device again notified and then recover normal;
Wherein, protective device has adaptive logic positioning function, and when power network topology changes, mutual the superior and the subordinate's logical relation set up voluntarily by each protective device.
Wherein, each protective device inside all have recorded the coded message of the adjacent protective device of higher level possible separately under various power network topology; after power network topology changes; each protective device communicates with the adjacent protective device of possible higher level of its internal record voluntarily; according to the state feeding back the adjacent protective device of higher level obtained; determine the adjacent protective device of the higher level of current reality, set up the superior and the subordinate's logical relation between each protective device thus.
Adaptive zero hour differential overcurrent protection method of the present invention overcomes the defect longer the closer to power end operation time limit that time delay over-current guard method exists; make when any position of the whole network is short-circuited; only use overcurrent protection just can excise fault in very short time; and automatically meet the cooperation of main protection and backup protection, reach the selectivity of defencive function and the best combination of quick-action.On the other hand, the method has configuration feature voluntarily, can the change of Initial adaption power network topology, and flexibility is strong, reduces labor management cost.In addition, the system configuration that the method manufactures is simple, and reliability is high, can be used in high voltage environment, realizes complicated defencive function.Such as in certain applications occasion, the complicated protection such as alternative differential protection and distance protection.
Accompanying drawing explanation
Fig. 1 is overcurrent protective device operation time limit setting schematic diagram in single-side power radiation network;
Fig. 2 is adaptive zero hour differential overcurrent protection device action time limit of the present invention setting schematic diagram;
Fig. 3 is variable certain the electric substation's electric power networks schematic diagram of power network topology;
Fig. 4 is the monitoring circuit breaker cellular construction block diagram realizing the inventive method employing.
Below in conjunction with accompanying drawing and operation principle, the present invention is described in further detail.
Embodiment
According to technique scheme, adaptive zero hour differential overcurrent protection method is that each protective device is all equipped with monitoring unit, carries out real time communication, as shown in phantom in Figure 2 between the protective device that all physics is directly connected by Ethernet.Its course of work is as follows:
Electric current in power circuit, voltage are input in microprocessor by collection of simulant signal and conditioning module.When circuit is short-circuited fault time, microprocessor starts timing, and notifies that higher level's circuit breakers of this circuit breaker has fault to occur by Ethernet, detects the notice whether having subordinate's circuit breakers simultaneously.If receive the notice of subordinate's circuit breakers, then operation time limit is set as t by microprocessor
i+ Δ t.If do not had notice, then operation time limit is set as t
i, and again notify its higher level's circuit breakers, the region that fault is administered at this circuit breaker.Notified higher level's circuit breaker, using the backup protection equipment as this region, is not received the higher level's circuit breakers again notified and is recovered normal.
For the electric network shown in Fig. 2, work as d
1during point short circuit, protective device 1 notifies that protective device 2 has fault to occur, and at protective device 2, operation time limit is set to t
1while+Δ t, protective device 1 will with t intrinsic operate time
1excision fault.If after protective device 1 action, failure removal, protective device 2 is just failure to actuate.Otherwise protective device 2 will with t
1the time limit action of+Δ t, excision fault.Similarly, d is worked as
2point short circuit, protective device 2, while notice protective device 3 has fault to occur, can detect the notice whether having protective device 1; If do not had notice, then protective device 2 will set intrinsic operation time limit is t
2, and again notify protective device 3; Notice received again by protective device 3 can be set to t by operation time limit automatically
2+ Δ t, using the backup protection equipment as C-D section.
In fig. 2, the intrinsic time limit of each protective device can be established equal.As concerning circuit breaker, t can be established
1=t
2=t
3=t
4=t
5=0.5s, Δ t=0.5s.Therefore, adaptive zero hour differential overcurrent protection method can make electrical network end identical with the operation time limit of the protective device near power end, and namely the operation time limit of each protective device is zero time difference.
Zero hour differential overcurrent protection method requires that in electrical network, each protective device logically has clear and definite relationship between superior and subordinate.So after power network topology changes the relationship between superior and subordinate change caused between protective device, original relay protective scheme is no longer applicable, and this just requires to give each protective device logic positioning function, the autonomous change adapting to power network topology.Be specifically described for certain the electric substation's electric power networks shown in Fig. 3 below.Comprise two power supplys, two transformers in this network, adopt one-sided power supply during normal work, so the various combination of power supply and transformer can produce 4 kinds of different network topologies, and wherein a kind of topology is that electric current flows into from end of incoming cables 1, and transformer 1 runs, and 2 is for subsequent use.In this case, node 6,7,12,14 place's circuit breaker is all disconnect, node 32-50 status equity, and being all in network least significant end, is secondly node 31(15-30) → 13 → 5 → 4(3-2) → 1, node 1 is near power end; For node 31, node 13 is its superior nodes.After employing transformer 2 replaces transformer 1, node 5,8,12,13 place's circuit breaker all disconnects; For node 31, node 14 becomes its superior node, and node 13 place circuit breaker no longer works, and relay protective scheme is originally no longer applicable.Because the topological structure of each electrical network is always limited; and for often kind of power network topology; each protective device has fixing higher level's protective device; so; can under each protective device be internally stored in all power network topologies; the coded message of higher level's protective device that this device is corresponding, for the node 31 in Fig. 3, recording its possible superior node is 13 and 14.When power network topology changes, after node 31 place protective device starts, sending status request information to possible superior node 13 and 14, according to obtaining feedback information, determining that the node of current " activity " is actual superior node.In like manner, the superior node of other node can be determined.The method does not require the Global Topological information of each protective device record electrical network, and only needs the coding recording the possible higher level's protective device be connected with self direct physical, and information storage is little.On the other hand, the method is only run once after power network topology changes, and information interaction times is few, and reliability is high.
Fig. 4 is the monitoring circuit breaker cellular construction block diagram realizing the inventive method, mainly comprises main controller module, communication module, collection of simulant signal and conditioning module, On-off signal output module, power module, temperature and real-time clock module and human-machine interface module etc.Main controller module adopts ARM microprocessor and complex programmable logic processing apparatus (CPLD) to control whole system as core controller.Wherein, ARM microprocessor primary responsibility processes input information, and outwards sends control command; CPLD is as infologic processor, primary responsibility ARM microprocessor and the information transmission between most of peripheral hardware and interface of external equipment and interface.Communication module comprises ethernet controller and interface, for the communication between each protective device.On-off signal output module mainly comprises On-off signal and circuit breaker output circuit, is responsible for obtaining On-off signal signal and outwards sending trip signal.
In software, the monitoring circuit breaker unit of the inventive method is with embedded real-time multi-task operating system VXworks for software platform, and design achieves bottom hardware driver, interrupt routine and top level application program.According to relay protection function demand and VXworks system features, task division is carried out to interrupt routine and application program, mainly comprised initiating task, protection task, monitor task, communication task, display task.
In communication protocol, communicated by Ethernet between protective device.For requirement of real time, adopt the communication protocol based on token.This agreement only allows the node having token to send data at synchronization, achieves point-to-point handshake communication and Web broadcast two kinds of data transfer modes, eliminates the randomness of transfer of data.According to this agreement, the maximum delay that data transmit equals the longest on network of token and travels round the time.Experiment test for two kinds of data transfer modes shows, real-time property all reaches goal-selling, practical requirement.
The advantage of the inventive method is as follows:
1.. overcome the defect longer the closer to power end operation time limit that time delay over-current guard method exists; make when any position of the whole network is short-circuited; only use overcurrent protection just can excise fault in very short time; and automatically meet the cooperation of main protection and backup protection, reach the selectivity of defencive function and the best combination of quick-action.
2.. have from main logic positioning function, can relationship between superior and subordinate automatically between configuration protection device, the change of Initial adaption power network topology, reduces manual intervention degree, applied range.
3.. system configuration is simple, flexibility is strong, reliability is high.
4.. can be used in high voltage environment, realize complicated defencive function.Such as in certain applications occasion, the complicated protection such as alternative differential protection and distance protection.
5.. realize simple, can be user and bring great convenience, for manufacturer brings huge economic benefit.
Claims (8)
1. an adaptive zero hour differential overcurrent protection method, comprises following steps:
(1) operation time limit of each protective device in electrical network is set to identical intrinsic time limit t
i, between two adjacent protective devices, there is communication connection;
(2) when certain protective device detects short circuit current; this protective device starts timing; and notify that the adjacent protective device of higher level has fault to occur; detect the corresponding notice whether had from the adjacent protective device of subordinate simultaneously; wherein; if the notice of the adjacent protective device of subordinate received by this protective device, then operation time limit is set as intrinsic time limit t
iadd scheduled time Dt; If do not had notice, then operation time limit is set as intrinsic time limit t
i, and again notifying the adjacent protective device of higher level, fault occurs in the region of this protective device administration;
(3) receive the adjacent protective device of the higher level again notified using the backup protection equipment as this region, do not receive the adjacent protective device of the higher level again notified and then recover normal;
Wherein, each protective device has adaptive logic positioning function, when power network topology changes, the superior and the subordinate's logical relation to each other set up voluntarily by each protective device, wherein, each protective device inside all have recorded the coded message of the adjacent protective device of higher level possible separately under various power network topology, after power network topology changes, each protective device, according to the coded message stored, sends status request information to the adjacent protective device of possible higher level; The protective device receiving request returns oneself state, if its current state is " activity ", then the protective device sent request determines that it is the actual adjacent protective device of higher level, sets up the superior and the subordinate's logical relation between each protective device thus.
2. method according to claim 1, is characterized in that, described protective device is circuit breaker.
3. method according to claim 2, it is characterized in that, be provided with monitoring unit in circuit breaker, have collection of simulant signal and conditioning module and microprocessor in monitoring unit, the electric current in power circuit, voltage are input in microprocessor by collection of simulant signal and conditioning module; When circuit is short-circuited fault time, microprocessor starts timing, and notifies the adjacent protective device of higher level of this protective device.
4. method according to claim 1, is characterized in that, described communication connection is that Ethernet connects.
5. method according to claim 4, described Ethernet adopts the agreement based on token, and synchronization only allows the protective device having token to send data.
6. be applied to a protective device adaptive logic localization method for power network topology, comprise the following steps:
(1) coded message of the adjacent protective device of each protective device internal record higher level that each protective device is possible under various power network topology in electrical network;
(2) after power network topology changes, each protective device, according to described coded message, sends status request information by communication connection to the adjacent protective device of possible higher level;
(3) according to feeding back, whether the adjacent protective device of higher level obtained is current is in " activity " state, and the adjacent protective device of the higher level of current reality determined by each protective device, sets up the superior and the subordinate's logical relation between each protective device thus.
7. method according to claim 6, described communication connection is Ethernet.
8. method according to claim 7, described Ethernet adopts the agreement based on token, and synchronization only allows the protective device having token to send data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310058237.0A CN103151765B (en) | 2013-02-25 | 2013-02-25 | Adaptive zero hour differential overcurrent protection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310058237.0A CN103151765B (en) | 2013-02-25 | 2013-02-25 | Adaptive zero hour differential overcurrent protection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103151765A CN103151765A (en) | 2013-06-12 |
| CN103151765B true CN103151765B (en) | 2015-09-30 |
Family
ID=48549696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310058237.0A Active CN103151765B (en) | 2013-02-25 | 2013-02-25 | Adaptive zero hour differential overcurrent protection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103151765B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104113048B (en) * | 2014-06-24 | 2017-11-10 | 中国石油化工股份有限公司 | A kind of power distribution network intelligent protection system |
| CN117081013A (en) * | 2023-08-24 | 2023-11-17 | 常熟理工学院 | Feedforward type overcurrent backup protection method and system for low-voltage distribution line |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3786311A (en) * | 1973-01-02 | 1974-01-15 | Gen Electric | Circuit breaker and static trip circuit therefor |
| CN1625009A (en) * | 2004-12-20 | 2005-06-08 | 西安交通大学 | Adaptive zero hour differential overcurrent protection method |
| CN102064536A (en) * | 2010-12-08 | 2011-05-18 | 河南省电力公司许昌供电公司 | Current protection method |
| CN102403792A (en) * | 2011-09-08 | 2012-04-04 | 天津理工大学 | Multi-Agent power grid self-adapting intelligent coordination protection control method and control system |
| CN102403718A (en) * | 2011-11-21 | 2012-04-04 | 武汉精伦软件有限公司 | Generating method for power grid topological relationship based on Arcgis |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101335609B (en) * | 2007-06-26 | 2011-08-10 | 华为技术有限公司 | Network time clock tracking method, network apparatus and network system |
-
2013
- 2013-02-25 CN CN201310058237.0A patent/CN103151765B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3786311A (en) * | 1973-01-02 | 1974-01-15 | Gen Electric | Circuit breaker and static trip circuit therefor |
| CN1625009A (en) * | 2004-12-20 | 2005-06-08 | 西安交通大学 | Adaptive zero hour differential overcurrent protection method |
| CN102064536A (en) * | 2010-12-08 | 2011-05-18 | 河南省电力公司许昌供电公司 | Current protection method |
| CN102403792A (en) * | 2011-09-08 | 2012-04-04 | 天津理工大学 | Multi-Agent power grid self-adapting intelligent coordination protection control method and control system |
| CN102403718A (en) * | 2011-11-21 | 2012-04-04 | 武汉精伦软件有限公司 | Generating method for power grid topological relationship based on Arcgis |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103151765A (en) | 2013-06-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10680430B2 (en) | Fault recovery systems and methods for electrical power distribution networks | |
| US9112381B2 (en) | Method and apparatus for managing the distribution of electrical energy in a power distribution grid | |
| CN101741139B (en) | Method and device thereof for detecting communication state of digital transformer substation | |
| CN105281435A (en) | Intelligent distribution network oriented distribution type fault detection and isolation system and working method | |
| CN204216675U (en) | Based on power distribution cabinet electric leakage monitoring and the guard system of CAN formula | |
| CN103457249B (en) | A kind of distributed longitudinal protection method of intelligent distribution network and system | |
| CN107612148B (en) | Distribution network overhead line fault self-healing method and system | |
| CN104412478A (en) | A power bay protection device and a method for protecting power bays | |
| CN114726097B (en) | Low-voltage intelligent circuit breaker device of double-core mode | |
| CN103023133A (en) | Dual power supply automatic changeover gear controller | |
| CN107785998B (en) | Monitoring method of distribution automation equipment in distribution system | |
| CN104701825A (en) | Quick protection method applicable to intelligent distribution network | |
| WO2023240954A1 (en) | Early warning method and device, and power supply and consumption system | |
| CN105488931A (en) | Warning signal generation device, base station power device, and base station power system | |
| CN203589833U (en) | Backup power automatic switching device | |
| CN103151765B (en) | Adaptive zero hour differential overcurrent protection method | |
| CN116582420A (en) | Submarine data center double-CPU redundancy system, control method and controller | |
| JP2018091828A (en) | System and method for synchronization of time source in protective zone of digital electric power substation | |
| CN108469557B (en) | High voltage direct current transmission device Fault Locating Method based on inverter differential protection | |
| CN104242461A (en) | Intelligent sectionalizer | |
| CN104682544A (en) | Spare power automatic switching method and device | |
| CN107257163B (en) | Method for determining network backup switch fault node | |
| CN203423539U (en) | Low-voltage power grid load and leak current integrated monitoring device | |
| CN102545378A (en) | Controller, load protection method, automatic transfer switching equipment and system | |
| CN202930897U (en) | Relay protection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |