CN104901292B - Power distribution network current protection system and method - Google Patents
Power distribution network current protection system and method Download PDFInfo
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- CN104901292B CN104901292B CN201510337303.7A CN201510337303A CN104901292B CN 104901292 B CN104901292 B CN 104901292B CN 201510337303 A CN201510337303 A CN 201510337303A CN 104901292 B CN104901292 B CN 104901292B
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Abstract
A kind of power distribution network current protection system and method; the system includes failure data acquisition module, local protection module, neighborhood information interactive module and Fault Identification module, and wherein failure data acquisition module is used to gather the fault current information for protecting installation place and on-load switch on feeder line after a failure；Local protection module is used to judge whether local overcurrent protection acts；Neighborhood information interactive module is used to gather the superior and the subordinate's protection, the protection act information and breaker actuation information of back side protection, and on-load switch fault current information is converted into III section overcurrent protection action messages；The information that Fault Identification module is used to obtain neighborhood information interactive module forms protection act criterion, cuts off failure.Using the power distribution network current protection system and method for the present invention, the problem of can solve the problem that relay fail after distributed power source access power distribution network, while reduce the power failure range caused by failure and ensure distributed power source continued power.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System field, especially relates to power distribution network current protection technology.
Background technology
For the Chinese most distribution system in town and country still based on radial chain structure, the network of this structure has many
Advantage, for example wiring is reliable, protection seting is easy, dilatation is simple etc..However as the continuous propulsion of intelligent grid pace of construction,
The a large amount of feed-ins of new energy, the access of distributed power source (Distributed Generator, DG) and microgrid, network reconfiguration with from
Regulation technology day, crescent was beneficial, and China's distribution net work structure is increasingly complicated, and the method for operation is also more flexible and changeable.
Under this new situation, traditional power distribution network relay protection be difficult in adapt to such complexity electric network composition and
The changeable method of operation, its matching principle and adjusts work and also becomes more complicated and difficult, is mainly reflected in following side
Face.
1) implementation of power distribution network reconfiguration and self-regulation technology so that Complicated Distribution Network is relative to conventional electrical distribution network operation mode
More changeable, there is also the topological forms such as more segmentations more contact, ring connections, and this causes the three-stage electricity commonly used in traditional distribution
Stream protection is difficult to clear and definite protection domain, is cooperated between protection also more complicated, while can also cause back-up protection delay long
The problems such as.
2) distributed power source access power distribution network after, make power distribution network trend be distributed there occurs larger change with short-circuit current level
Change.The different running statuses of distributed power source may cause the direction of tide of higher level's circuit to change, and cause higher level's route protection
Malfunction；The introducing of distributed power source changes the short-circuit current level of node near distributed power source, when failure occurs due to dividing
Cloth power supply helps increasing or shunting action, and flowing through the fault current of protection device may increase or reduce, and it will change protection
Protection domain and sensitivity, make protection be possible to lose selectivity, also asked to the superior and the subordinate's mating band of each circuit relay protection
Topic.
In the prior art, the associated solutions of power distribution network relay protection are included：It is more based on time differential power distribution network
Level protection cooperation, the mode that the power distribution network multi-stage protection based on unilateral information coordinates and the two is combined.Former fit system
Need the long period to cut off failure in backbone failure, system power supply safety may be influenceed；Easily there is tripping operation of bypassing the immediate leadership in the latter
Phenomenon.
The content of the invention
In view of this, the purpose of the present invention be intended to overcome distribution protection scheme back-up protection in the prior art delay compared with
It is long, power failure range is big, false protection and the problem of tripping, proposes a kind of power distribution network current protection system and method, reduce therefore
Hinder power failure range and ensure distributed power source continued power.
In order to realize this purpose, the technical scheme that the present invention takes is as follows：
A kind of power distribution network current protection system, the system include failure data acquisition module, the local guarantor being sequentially connected
Module, neighborhood information interactive module and Fault Identification module are protected, wherein,
Failure data acquisition module is used to gather the fault current for protecting installation place and on-load switch on feeder line after a failure
Information, the information of collection is sent to local protection module；
Local protection module is used to judge whether local overcurrent protection acts according to fault current information, and protection is dynamic
Make information, the fault current information of on-load switch is sent to neighborhood information interactive module；
Neighborhood information interactive module is used to gather the superior and the subordinate's protection, the protection act information of back side protection and breaker actuation
Information, and on-load switch fault current information is converted into III section overcurrent protection action messages；
The information that Fault Identification module is used to obtain neighborhood information interactive module forms protection act criterion, excision event
Barrier.
Wherein described local protection module includes positive protection module and reverse protection module, wherein,
The differential mistake of three-level that positive protection module is made up of two backbones switch of outlet switch, achievable Graded coordination
Current protection is formed；
Reverse protection module is by the distributed power source upstream switch of feeder terminal, the upstream switch two of achievable Graded coordination
The differential overcurrent protection of level is formed.
The overcurrent protection of outlet switch and trunk wiretap and the III sections that nearer user's switch time delay is zero second are excessively electric
Flow conservation of nature and form the differential overcurrent protection of two level
And the positive protection module is configured to：Feeder terminal protection is protected as the third level, and configuration delay is zero second
III section overcurrent protections, the switch among backbone are protected as the second level, and configuration delay is excessively electric for the III sections of the first delay
Stream protection, outlet switch are protected as the first order, and configuration delay is the 3rd for the III sections overcurrent protection of the second delay and delay
The I section overcurrent protections of delay.
And the reverse protection module is configured to：The distributed power source upstream switch of feeder line head end is protected as the second level,
Configuration delay is the III section overcurrent protections of the 4th delay, and the distributed power source upstream switch of feeder terminal is as first order guarantor
Shield, the I section overcurrent protections that configuration delay is the III sections overcurrent protection of the 5th delay and delay is the 6th delay.
The protection act criterion of the Fault Identification module composition includes protection accelerated motion criterion, and the protection accelerates dynamic
It is as criterion：
Work as S1+S2+S3>Acted when 0,
Work as S1+S2+S3It is failure to actuate when=0,
Work as S1+S2+S3<Locking when 0, wherein,
S1、S2、S3Criterion one, two, three is represented,
A represents overcurrent protection outlet action,
Subscript III represents three sections of overcurrent protections,
Subscript 0 represents protection of interest,
Subscript C represents offside protection,
Subscript D represents back side protection,
Subscript L represents subordinate's protection,
Subscript 0B represents the branched line protection of protection of interest,
Subscript LB represents the branched line protection of subordinate's circuit.
The protection act criterion of the Fault Identification module composition includes breaker fail protection criterion, and the breaker loses
Clever Protection criteria is：
The branched line overcurrent protection outlet action of subordinate's circuit, breaker are motionless
When making, accelerate tripping circuit breakers,
The outlet of subordinate's circuit overcurrent protection acts, and when breaker is failure to actuate, accelerates to jump
Open circuit breakers,
Wherein A represents overcurrent protection outlet action,
B represents breaker outlet action,
Subscript III represents three sections of overcurrent protections,
Subscript L represents subordinate's protection,
Subscript LB represents the branched line protection of subordinate's circuit.
A kind of power distribution network current protection method, methods described include step：
A, the fault current information that installation place and on-load switch are protected on feeder line is gathered after a failure；
B, judge whether local overcurrent protection acts according to fault current information；
C, the superior and the subordinate's protection, the protection act information and breaker actuation information of back side protection are gathered；
D, the superior and the subordinate are protected, the protection act information of back side protection and breaker actuation information composition protection act are sentenced
According to excision failure.
In the step B of methods described, judge whether local overcurrent protection is acted including just according to fault current information
To protection and reverse protection, wherein,
Forward direction is protected：Protected by the use of feeder terminal protection as the third level, the III section overcurrent that configuration delay is zero second
Protection, to be protected by the use of the switch among backbone as the second level, configuration delay is the III section overcurrent protections of the first delay,
Protected by the use of outlet switch as the first order, configuration delay is the 3rd to prolong for the III sections overcurrent protection of the second delay and delay
When I section overcurrent protections；
Reverse protection is：Protected by the use of the distributed power source upstream switch of feeder line head end as the second level, configuration delay is
The III section overcurrent protections of 4th delay, are protected by the use of the distributed power source upstream switch of feeder terminal as the first order, configuration
It is the 6th I section overcurrent protections being delayed to be delayed as the III sections overcurrent protection of the 5th delay and delay.
Forming protection act criterion in step D includes composition protection accelerated motion criterion, and the protection accelerated motion is sentenced
According to for：
Work as S1+S2+S3>Acted when 0,
Work as S1+S2+S3It is failure to actuate when=0,
Work as S1+S2+S3<Locking when 0, wherein,
S1、S2、S3Criterion one, two, three is represented,
A represents overcurrent protection outlet action,
Subscript III represents three sections of overcurrent protections,
Subscript 0 represents protection of interest,
Subscript C represents offside protection,
Subscript D represents back side protection,
Subscript L represents subordinate's protection,
Subscript 0B represents the branched line protection of protection of interest,
Subscript LB represents the branched line protection of subordinate's circuit.
And protection act criterion is formed in step D and is protected including forming breaker fail protection criterion, the breaker failure
Protecting criterion is：
The branched line overcurrent protection outlet action of subordinate's circuit, breaker are motionless
When making, accelerate tripping circuit breakers,
The outlet of subordinate's circuit overcurrent protection acts, and when breaker is failure to actuate, accelerates to jump
Open circuit breakers,
Wherein A represents overcurrent protection outlet action,
B represents breaker outlet action,
Subscript III represents three sections of overcurrent protections,
Subscript L represents subordinate's protection,
Subscript LB represents the branched line protection of subordinate's circuit.
By using the power distribution network current protection system and method for the present invention, it can solve the problem that distributed power source accesses power distribution network
Afterwards the problem of relay fail, while reduce the power failure range caused by failure and ensure distributed power source continued power.Neighborhood
Information exchange function forms protection act criterion and accelerates back-up protection, prevents fault state from deteriorating, safeguards system securely and reliably supplies
Electricity.Protection act criterion utilizes redundancy in the power distribution network current protection system and method for the present invention, has necessarily fault-tolerant
Property, it is ensured that reliably cut off failure.
Brief description of the drawings
Fig. 1 is the structural representation of power distribution network current protection system in the specific embodiment of the invention.
Fig. 2 is a kind of circuit diagram of typical distribution net in the specific embodiment of the invention.
Fig. 3 is the differentiation result of protection accelerated motion criterion when different typical faults occurring in embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawings, the present invention is elaborated.
The detailed example embodiment of following discloses.However, concrete structure disclosed herein and function detail merely for the sake of
The purpose of example embodiment is described.
It should be appreciated, however, that the present invention is not limited to disclosed particular exemplary embodiment, but covering falls into disclosure model
Enclose interior all modifications, equivalent and alternative.In the description to whole accompanying drawings, identical reference represents identical member
Part.
It will also be appreciated that term "and/or" includes any of one or more related list items as used in this
With all combinations.It will further be appreciated that when part or unit are referred to as " connecting " or during " coupled " to another part or unit, it
Miscellaneous part or unit are can be directly connected or coupled to, or there may also be intermediate member or unit.In addition, for describing
Between part or unit other words of relation should understand in the same fashion (for example, " between " to " directly between ",
" adjacent " is to " direct neighbor " etc.).
First, the implication of the symbol of outlet in this patent is described collectively：
S1、S2、S3Criterion one, two, three is represented,
A represents overcurrent protection outlet action,
B represents breaker outlet action,
Subscript III represents three sections of overcurrent protections,
Subscript 0 represents protection of interest,
Subscript C represents offside protection,
Subscript D represents back side protection,
Subscript L represents subordinate's protection,
Subscript 0B represents the branched line protection of protection of interest,
Subscript LB represents the branched line protection of subordinate's circuit.
Fig. 1 is the structural representation of power distribution network current protection system in the specific embodiment of the invention.As shown in figure 1, institute
State failure data acquisition module, local protection module, the neighborhood information interaction that power distribution network current protection system includes being sequentially connected
Module and Fault Identification module, wherein,
Failure data acquisition module is used to gather the fault current for protecting installation place and on-load switch on feeder line after a failure
Information, the information of collection is sent to local protection module；
Local protection module is used to judge whether local overcurrent protection acts according to fault current information, and protection is dynamic
Make information, the fault current information of on-load switch is sent to neighborhood information interactive module；
Neighborhood information interactive module is used to gather the superior and the subordinate's protection, the protection act information of back side protection and breaker actuation
Information, and on-load switch fault current information is converted into III section overcurrent protection action messages；
The information that Fault Identification module is used to obtain neighborhood information interactive module forms protection act criterion, excision event
Barrier.
Therefore, power distribution network current protection system of the invention can utilize the action message of adjacent protection, and breaker
Action message, more complete protection is formed to distribution network system.
Fig. 2 is a kind of circuit diagram of typical distribution net in the specific embodiment of the invention.Because distribution feeder is shorter, hair
The short circuit current difference of each position is little during raw failure.For example, it is short that two-phase occurs under maximum operational mode in AC feeder line sections
Current quick during road at outlet switch can act, and electric current speed during line to line fault at outlet switch occurs for AC sections downstream
Disconnected protection will not act, i.e., AC sections are not suitable for the overcurrent protection of configuration cascaded coordination.
Therefore, in a detailed embodiment, the local protection module includes positive protection module and reverse protection
Module, wherein the three-level that positive protection module is made up of two backbones switch of outlet switch, achievable Graded coordination is differential
Overcurrent protection is formed；Reverse protection module by feeder terminal distributed power source upstream switch, can be achieved Graded coordination it is upper
The differential overcurrent protection of trip switch two-stage is formed.
Specifically, local protection module includes positive protection module, by the forward direction of outlet switch 1, trunk wiretap 3,4
The differential overcurrent protection of three-level is formed.In addition, local protection module includes reverse protection module, it is made up of protection 6, protection 7
The reverse differential overcurrent protection of two level is formed.
At the same time, user's switch is provided with the III section overcurrent protections that delay is zero second, outlet switch and backbone
The delay overcurrent protection of switch forms the protection of two-stage Graded coordination with nearer user's switch naturally.Electricity was configured in Fig. 2
The feeder switch of stream protection cooperation is represented with rectangle, and the feeder switch for not configuring current protection cooperation is represented using circle.
Especially, the positive protection module is configured to：Feeder terminal protection is protected as the third level, and configuration delay is zero
Second III section overcurrent protections, the switch among backbone protects as the second level, and configuration delay is the first III sections being delayed
Overcurrent protection, outlet switch are protected as the first order, and configuration delay is for the III sections overcurrent protection of the second delay and delay
The I section overcurrent protections of 3rd delay.
In addition, the reverse protection module is configured to：The distributed power source upstream switch of feeder line head end is protected as the second level
Shield, configuration delay are the III section overcurrent protections of the 4th delay, and the distributed power source upstream switch of feeder terminal is as the first order
Protection, the I section overcurrent protections that configuration delay is the III sections overcurrent protection of the 5th delay and delay is the 6th delay.
The above first is delayed to be set to the 6th delay according to factors such as system response requirements, such as in a specific implementation
In mode, first delay is 0.2 second, the second delay is 0.4 second, the 3rd delay is 0.2 second, and the 4th delay is 0.2 second, the
Five delays are 0.2 second for 0.4 second and the 6th delay.
With reference to illustrating in Fig. 2, when failure occurs at F1, cut off by the no-delay overcurrent protection of protection 8
Failure, cut off when protecting 8 failure by outlet switch 1 and protection 7 as back-up protection, while ensure CE section normal power supplies.When event
Barrier occurs in F2, is cut off within 0.2 second by protection 1 and the delay of protection 7.Failure occurs in F3, is cut within 0.2 second by the delay of protection 3 and 6
Remove, if 3 failures of protection will be delayed 0.4 second by protection 1 as back-up protection cuts off failure.
Multi-stage protection cooperation is difficult to because distribution line is shorter, traditional protection needs to cut off largely negative when cutting off failure
Lotus.As failure occurs in F3, conventional current protection scheme is disconnected by switch 3, and now load below C points is all removed.
And configured in the power distribution network over-current protection system of the present invention using positive protection module and reverse protection module, by
After this realizes directional over current-based-protection, failure F3 is by protection 3 and the isolation of protection 6, it is ensured that below node E load and distribution
Power supply DG2 is not removed.Therefore, directional over current-based-protection not only ensures the matching relationship of branch switch and trunk wiretap,
And power failure range is effectively reduced, reach the purpose of fast and reliable excision failure.
On the other hand, the access of distributed power source can influence the distribution of distribution network failure electric current, draw and help increasing former according to outer
Reason, the short circuit current of distributed power source DG nodes upstream will reduce during line fault, distributed power source DG nodes downstream it is short
Road electric current can increase.Distributed power source is to short circuit current under different faults position and the different distributions formula power supply DG methods of operation
Influence different.
Because photovoltaic and wind-force distributed power supply DG randomness and intermittence are larger, calculated according to some method of operation
Setting valve may not adapt to the change of fault current, so as to false protection and misaction occur.In addition, it is distributed
Power supply DG fault currents current value after step-up transformer becomes very little, and part distributed power source is due to itself overcurrent protection
Device can not continue to provide short circuit current, it is difficult to be judged according to distributed power source fault current.Therefore, it is of the invention to match somebody with somebody
Power network current protection system and method proposes protection accelerated motion criterion, is protected according to the superior and the subordinate, the protection of back side protection is moved
Make information and breaker actuation information composition protection act criterion, it is ensured that effectively reliable excision failure.
Specifically, the overcurrent protection scheme based on local information is closed for the cooperation of guarantee trunk wiretap and branch switch
System, failure occur the quick-action deficiency in backbone, especially need to be cut off by back-up protection when an error occurs.For example, failure
When point F2 is located closer to C, 1 delay fast tripping protection akinesia is protected, it is necessary to by overcurrent protection under the longer time limit
Excision, interior transformer or bus safety of standing may be influenceed, equally protects during 3 failure and such case also occurs.
The power distribution network current protection system and method for the present invention is quick excision failure, is carried for all protections on backbone
The protection accelerated motion criterion based on neighborhood information interaction is gone out.Configure directional over current-based-protection dress on the nodes first
Put, the superior and the subordinate's protection is combined by Feeder Terminal Unit (Feeder Terminal Unit, FTU), the protection of back side protection is moved
Make information and breaker actuation information, troubles inside the sample space is positioned, quickly cut off failure.
Specifically, the protection accelerated motion criterion is：
Work as S1+S2+S3>Acted when 0,
Work as S1+S2+S3It is failure to actuate when=0,
Work as S1+S2+S3<Locking when 0.
Such as when protection 1 be protection of interest, and failure occurs in F2, the overcurrent protection outlet of protection 1,7 acts,
The overcurrent protection outlet of protection 3,8 is failure to actuate, therefore is had Therefore there is S1=
1, S3=1, i.e. S1+S2+S3>0, therefore protect 1 accelerated motion excision failure.And when only configuring the overcurrent protection of local information,
Need to be by protecting 1 delaying current fast tripping protection to be cut off after 0.2s or overcurrent protection 0.4s, therefore the protection of the present invention accelerates to move
Make the shortcomings that criterion can make up local current protection quick-action deficiency.Meanwhile adjacent protection information is made full use of, formation is multiple to be sentenced
According to, be mutually redundant, even if some mistake of the information collected or missing part information can also accurate judgement, therefore have
Certain fault-tolerance, reliability are higher.
When failure occurs in F4, for protection 3, its subordinate's route protection outlet action, there is S1+S2+S3<0, protection 3 is closed
Lock, occur so as to avoid the situation for tripping operation of bypassing the immediate leadership.It has been presented in Fig. 3 different typical fault positions in the specific embodiment of the invention
Put the judged result of lower protection accelerated motion criterion.
The Wide-area Measurement Information for being used to protect accelerated motion criterion in the present invention is all switching value, and the scope of Wide-area Measurement Information is only
It is limited to adjacent node, therefore transinformation is little.According to existing communication condition, it is believed that it is fixed that its actuation time is less than band
The current quick of delay, as long as setting valve meets electric current instant protection setting valve and when delay just action, if delay
Period fault current, which disappears, then to be returned, therefore does not interfere with the independence of local current protection.
In addition, the protection act criterion of Fault Identification module composition also includes breaker fail protection criterion, the open circuit
Device failure protection criterion is：
The branched line overcurrent protection outlet action of subordinate's circuit, breaker are motionless
When making, accelerate tripping circuit breakers,
The outlet of subordinate's circuit overcurrent protection acts, and when breaker is failure to actuate, accelerates to jump
Open circuit breakers.
The breaker fail protection criterion explanation：If protection exit information and circuit-breaker status are inconsistent, then it is assumed that should
Breaker failure, therefore accelerate the tripping breaker adjacent with failure breaker, remote back-up protection is returned in time, is realized and is passed
The function of system breaker fail protection, and acceleration disturbance is cut off.
It is adapted with power distribution network current protection system of the present invention, also disclosing one kind in the present invention also embodiment matches somebody with somebody
Power network current guard method, methods described include step：
A, the fault current information that installation place and on-load switch are protected on feeder line is gathered after a failure；
B, judge whether local overcurrent protection acts according to fault current information；
C, the superior and the subordinate's protection, the protection act information and breaker actuation information of back side protection are gathered；
D, the superior and the subordinate are protected, the protection act information of back side protection and breaker actuation information composition protection act are sentenced
According to excision failure.
In the power distribution network current protection method step B of embodiment, local mistake is judged according to fault current information
Whether current protection is acted including forward direction protection and reverse protection, wherein,
Forward direction is protected：Protected by the use of feeder terminal protection as the third level, the III section overcurrent that configuration delay is zero second
Protection, to be protected by the use of the switch among backbone as the second level, configuration delay is the III section overcurrent protections of the first delay,
Protected by the use of outlet switch as the first order, configuration delay is the 3rd to prolong for the III sections overcurrent protection of the second delay and delay
When I section overcurrent protections.
Reverse protection is：Protected by the use of the distributed power source upstream switch of feeder line head end as the second level, configuration delay is
The III section overcurrent protections of 4th delay, are protected by the use of the distributed power source upstream switch of feeder terminal as the first order, configuration
It is the 6th I section overcurrent protections being delayed to be delayed as the III sections overcurrent protection of the 5th delay and delay.
In addition, in the power distribution network current protection method step D of embodiment, composition protection act criterion includes group
Into protection accelerated motion criterion, the protection accelerated motion criterion is：
Work as S1+S2+S3>Acted when 0,
Work as S1+S2+S3It is failure to actuate when=0,
Work as S1+S2+S3<Locking when 0.
In addition, protection act criterion is formed in step D includes composition breaker fail protection criterion, the breaker failure
Protection criteria is：
The branched line overcurrent protection outlet action of subordinate's circuit, breaker are motionless
When making, accelerate tripping circuit breakers,
The outlet of subordinate's circuit overcurrent protection acts, and when breaker is failure to actuate, accelerates to jump
Open circuit breakers.
Therefore, power distribution network current protection system proposed by the invention and its method, main protection are configured with double-ended current amount
Differential current protection, effectively solve the problems, such as relay fail after distributed power source access power distribution network, while reduce fault outage
Scope and ensure distributed power source continued power.Neighborhood information interaction forms protection act criterion and accelerates back-up protection, prevents event
Barrier situation deteriorates, and safeguards system is securely and reliably powered.Protection act criterion make use of redundancy, have certain fault-tolerance, really
Protect reliable excision failure.
It should be noted that above-mentioned embodiment is only the preferable embodiment of the present invention, it is impossible to is understood as to this
The limitation of invention distance protection scope, under the premise of without departing from present inventive concept, to any minor variations for being done of the present invention with
Modification belongs to the distance protection scope of the present invention.
Claims (8)
1. a kind of power distribution network current protection system, the system includes failure data acquisition module, the local protection being sequentially connected
Module, neighborhood information interactive module and Fault Identification module, wherein,
Failure data acquisition module is used to gather the fault current information for protecting installation place and on-load switch on feeder line after a failure,
The information of collection is sent to local protection module；
Local protection module is used to judge whether local overcurrent protection acts according to fault current information, and protection act is believed
Breath, the fault current information of on-load switch are sent to neighborhood information interactive module；
Neighborhood information interactive module is used to gather the superior and the subordinate's protection, the protection act information of back side protection and breaker actuation letter
Breath, and on-load switch fault current information is converted into III section overcurrent protection action messages；
The information that Fault Identification module is used to obtain neighborhood information interactive module forms protection act criterion, cuts off failure；
The local protection module includes positive protection module and reverse protection module, wherein,
The differential overcurrent of three-level that positive protection module is made up of two backbones switch of outlet switch, achievable Graded coordination
Protection structure；
Reverse protection module is by the distributed power source upstream switch of feeder terminal, the upstream switch two level level of achievable Graded coordination
Poor overcurrent protection is formed；
The III section over current protections that the overcurrent protection of outlet switch and trunk wiretap is zero second with nearer user's switch time delay
Protect the differential overcurrent protection of self-assembling formation two level.
2. according to the power distribution network current protection system described in claim 1, it is characterised in that the positive protection module configuration
For：Feeder terminal protection is protected as the third level, the III section overcurrent protections that configuration delay is zero second, opening among backbone
To close and protected as the second level, configuration is delayed to be protected for the III section overcurrent protections of the first delay, outlet switch as the first order,
The I section overcurrent protections that configuration delay is the III sections overcurrent protection of the second delay and delay is the 3rd delay.
3. according to the power distribution network current protection system described in claim 1, it is characterised in that the reverse protection module configuration
For：The distributed power source upstream switch of feeder line head end is protected as the second level, and configuration delay is the 4th III section overcurrent being delayed
Protection, the distributed power source upstream switch of feeder terminal are protected as the first order, and configuration delay is excessively electric for the III sections of the 5th delay
Stream protection and delay are the 6th I section overcurrent protections being delayed.
4. according to the power distribution network current protection system described in claim 1, it is characterised in that the Fault Identification module composition
Protection act criterion include protection accelerated motion criterion, it is described protection accelerated motion criterion be：
Work as S1+S2+S3Acted during ＞ 0,
Work as S1+S2+S3It is failure to actuate when=0,
Work as S1+S2+S3Locking during ＜ 0, wherein,
S1、S2、S3Criterion one, two, three is represented,
A represents overcurrent protection outlet action,
Subscript III represents three sections of overcurrent protections,
Subscript 0 represents protection of interest,
Subscript C represents offside protection,
Subscript D represents back side protection,
Subscript L represents subordinate's protection,
Subscript 0B represents the branched line protection of protection of interest,
Subscript LB represents the branched line protection of subordinate's circuit.
5. according to the power distribution network current protection system described in claim 1, it is characterised in that the Fault Identification module composition
Protection act criterion include breaker fail protection criterion, the breaker fail protection criterion is：
The branched line overcurrent protection outlet action of subordinate's circuit, when breaker is failure to actuate,
Accelerate tripping circuit breakers,
The outlet of subordinate's circuit overcurrent protection acts, and when breaker is failure to actuate, accelerates tripping phase
Adjacent breaker,
Wherein A represents overcurrent protection outlet action,
B represents breaker outlet action,
Subscript III represents three sections of overcurrent protections,
Subscript L represents subordinate's protection,
Subscript LB represents the branched line protection of subordinate's circuit.
6. a kind of power distribution network current protection method, methods described includes step：
A, the fault current information that installation place and on-load switch are protected on feeder line is gathered after a failure；
B, judge whether local overcurrent protection acts according to fault current information；
C, the superior and the subordinate's protection, the protection act information and breaker actuation information of back side protection are gathered；
D, the superior and the subordinate are protected, the protection act information of back side protection and breaker actuation information composition protection act criterion, cut
Except failure；
In the step B of methods described, judge whether local overcurrent protection acts according to fault current information and protected including forward direction
And reverse protection, wherein,
Forward direction is protected：Protected by the use of feeder terminal protection as the third level, the III section over current protections that configuration delay is zero second
Shield, protected by the use of the switch among backbone as the second level, configuration is delayed as the III section overcurrent protections of the first delay, profit
Protected by the use of outlet switch as the first order, configuration delay is the 3rd delay for the III sections overcurrent protection of the second delay and delay
I section overcurrent protections；
Reverse protection is：Protected by the use of the distributed power source upstream switch of feeder line head end as the second level, configuration delay is the 4th
The III section overcurrent protections of delay, protected by the use of the distributed power source upstream switch of feeder terminal as the first order, configuration delay
III sections overcurrent protection and delay for the 5th delay are the I section overcurrent protections of the 6th delay.
7. according to the power distribution network current protection method described in claim 6, it is characterised in that form protection act in step D
Criterion includes composition protection accelerated motion criterion, and the protection accelerated motion criterion is：
Work as S1+S2+S3Acted during ＞ 0,
Work as S1+S2+S3It is failure to actuate when=0,
Work as S1+S2+S3Locking during ＜ 0, wherein,
S1、S2、S3Criterion one, two, three is represented,
A represents overcurrent protection outlet action,
Subscript III represents three sections of overcurrent protections,
Subscript 0 represents protection of interest,
Subscript C represents offside protection,
Subscript D represents back side protection,
Subscript L represents subordinate's protection,
Subscript 0B represents the branched line protection of protection of interest,
Subscript LB represents the branched line protection of subordinate's circuit.
8. according to the power distribution network current protection method described in claim 6, it is characterised in that form protection act in step D
Criterion includes composition breaker fail protection criterion, and the breaker fail protection criterion is：
The branched line overcurrent protection outlet action of subordinate's circuit, when breaker is failure to actuate,
Accelerate tripping circuit breakers,
The outlet of subordinate's circuit overcurrent protection acts, and when breaker is failure to actuate, accelerates tripping phase
Adjacent breaker,
Wherein A represents overcurrent protection outlet action,
B represents breaker outlet action,
Subscript III represents three sections of overcurrent protections,
Subscript L represents subordinate's protection,
Subscript LB represents the branched line protection of subordinate's circuit.
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| CN105977937B (en) * | 2016-06-14 | 2018-04-10 | 华北电力大学 | The power distribution network area protection system and method for a kind of logic-based amount information |
| CN106655124A (en) * | 2016-12-30 | 2017-05-10 | 南华大学 | Failure protection algorithm and apparatus for line circuit breaker |
| CN106849034A (en) * | 2017-03-14 | 2017-06-13 | 国网江苏省电力公司苏州供电公司 | Overcurrent protection method and device based on power distribution network operation with closed ring mode |
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