CN110416982A - A method of circuit breaker trip number is reduced using Fault Current Limiting Device - Google Patents
A method of circuit breaker trip number is reduced using Fault Current Limiting Device Download PDFInfo
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- CN110416982A CN110416982A CN201910714008.7A CN201910714008A CN110416982A CN 110416982 A CN110416982 A CN 110416982A CN 201910714008 A CN201910714008 A CN 201910714008A CN 110416982 A CN110416982 A CN 110416982A
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- fault
- breaker
- failure
- fault current
- limiting device
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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
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
A method of circuit breaker trip number is reduced using Fault Current Limiting Device, it is therefore an objective to be reduced breaker actuation number, be improved the power supply reliability and stability of AC system.When line failure, fault current limiter puts into operation, reduces fault current, but relative to electric current when operating normally, fault current is still larger, and after route protection starting, protective relaying device is delayed to the trip signal that breaker issues.If failure disappears in this section of delay time, protective relaying device no longer sends trip signal to breaker after delay；If failure still has after delay, then protective relaying device issues trip signal to breaker, realizes the isolation of failure.This method makes breaker in the case where power grid receiving fault current continues to run the transient fault to disappear in the time, without separating brake, closes a floodgate, reduces the loss of breaker, also avoids reclosing and gives system bring secondary pulse, improves the stability of system operation.
Description
Technical field
The invention belongs to field of relay protection in power, in particular to a kind of to reduce breaker using Fault Current Limiting Device
The method of tripping times achievees the purpose that fault current limiting using the Fault Current Limiting Device being installed at line outlet, avoids
A part of transient fault causes circuit breaker trip.
Background technique
Tight contact and power load recently as each bulk power grid increase, and power grid scale constantly expands, so that line
Road short circuit current level constantly increases.In order to limit line short circuit current, a kind of common method is to install current limliting on the line
Device.Current-limiting apparatus can limit capacity of short circuit, and mitigating fault current influences the dynamic of grid equipment, thermal stability, improve line
The ability of fault current impact is born on road, and the time ratio that when failure makes power grid can continue to operation does not install Fault Current Limiting Device
It is long.
The electric line of electric system is long-term exposed in external environment, is easy to happen by thunder and lightning, strong wind, birds and tree
Instantaneity short trouble caused by branch etc., so that inner breaker separating brake, combined floodgate in short-term, reduces the service life of breaker, reduce
Power supply reliability.And the line is busy 90% or more of road total failare for transient fault, and the duration is very of short duration, and several milliseconds to several seconds
Differ.
Therefore, in order to reduce transient fault circuit breaker trip number, and the failure current limit for being installed in route is made full use of
Device, improves power grid power supply reliability, and the present invention has studied the electric line troubleshooting strategy of config failure current-limiting apparatus.
Fault current limiter of the strategy using installing on the line limits capacity of short circuit when failure occurs, and reduces fault current to electricity
Net equipment influences, and improves fault ride-through of power grid ability.In generation duration short transient fault, delay relay protection dress
It sets and issues trip signal to breaker, avoid the transient fault to disappear in this section of delay time from causing breaker actuation, subtract
Few tripping is lost caused by breaker, increases the active time of breaker, also avoids influence of the reclosing to system.Due to disconnected
Road device does not trip, and route is still continuing to run, therefore the recovery time of system greatly shortens, the stability enhancing of system.
Summary of the invention
The present invention proposes a kind of using Fault Current Limiting Device for the line fault processing strategie of installing Fault Current Limiting Device
The method for reducing transient fault circuit breaker trip number.This method the purpose is to reduce breaker actuation number, improve exchange
The power supply reliability and stability of system.Its main feature is that fault current limiter puts into operation when line failure, reduce failure
Electric current, but relative to electric current when operating normally, fault current is still larger, after route protection starting, by protective relaying device
The trip signal delay issued to breaker.If failure disappears in this section of delay time, protective relaying device after delay
No longer trip signal is sent to breaker；If failure still has after delay, then protective relaying device is issued to breaker and is jumped
The isolation of failure is realized in lock order.
Realize that the technical solution of the object of the invention is as follows:
A method of circuit breaker trip number is reduced using Fault Current Limiting Device, comprising:
When line failure in electric system, the Fault Current Limiting Device being installed at line outlet is made to put into operation,
Fault current limiting；
According to fault degree criterion, the fault severity level occurred is judged, including
If fault degree criterion Judging fault degree is serious, circuit relay protection device is enabled to issue trip command to breaker
Isolated fault；
If fault degree criterion Judging fault degree is not serious, enables circuit relay protection device issue tripping to breaker and prolong
When order；
After delay time, according to fault detection criterion, judge whether failure still remains, including
If failure has disappeared, circuit relay protection device does not send trip command to breaker；
If failure still has, circuit relay protection device sends trip command isolated fault to breaker.
Further, the fault degree criterion is
Wherein, F1=0 indicates that fault degree is serious, and F1=1 indicates that fault degree is not serious；
IfFor the line fault electric current of Fault Current Limiting Device, Iset1The maximum short circuit that can be born for various kinds of equipment on route
Electric current, i.e. Iset1=min { Imax1,Imax2,Imax3... }, wherein Imax1、Imax2、Imax3... for various kinds of equipment difference on route
The maximum short circuit current that can be born.
Further, the fault detection criterion is
Wherein, F2=0 indicates that failure still has, and F2=1 indicates that failure has disappeared；
IfFor the line fault electric current of Fault Current Limiting Device, Iset2For setting valve,
Iset2=KIn, wherein K is nargin coefficient, K >=1；InFor route maximum overload electric current.
The beneficial effect of this method is, when electric system electric line breaks down, due to what is installed on route
Fault Current Limiting Device metering function, can effectively limit capacity of short circuit, and the time ratio that power grid can continue to operation does not have failure limit
It is long to flow device.And the line is busy 90% or more of road total failare for transient fault, and the duration is very of short duration, and several milliseconds to several seconds are not
Deng.This method makes breaker in the case where power grid receiving fault current continues to run the transient fault to disappear in the time, without dividing
Lock, combined floodgate reduce the loss of breaker, also avoid reclosing and give system bring secondary pulse, improve the steady of system operation
It is qualitative.
Detailed description of the invention
Fig. 1 is the flow chart that transient fault circuit breaker trip number strategy is reduced using Fault Current Limiting Device.
Fig. 2 is the power distribution network main wiring diagram containing 4 feeder lines.Wherein ground fault, Fault Current Limiting Device installation occur for feeder line 1
In feeder line exit, it is able to achieve the current limliting of any place's failure of this line.
Fig. 3 is breaker point/combined floodgate timing diagram when breaking down.
Fig. 4 is the logic chart for reducing circuit breaker trip number.
Specific embodiment
In order to reduce the number of transient fault breaker actuation, the stability of AC system, strategy of the invention are improved
Are as follows: when electric line breaks down, fault current limiter puts into operation, fault current limiting, if fault current is big, illustrates event
Barrier degree is serious, it is meant that this kind of failure is impacted bigger to power grid bring, it is necessary to which, as early as possible by Fault Isolation, therefore, route is protected
The delay Δ t not being set after shield starting issues trip signal, isolated fault directly to breaker by protective relaying device；If
Fault current is small, illustrates that fault degree is not serious, it is meant that grid equipment can be under fault current after reforwarding in electric system
Row for a period of time, gives breaker to issue trip signal, in this section of delay time after the delay Δ t that protective relaying device is set
Interior, if failure has disappeared, protective relaying device does not issue trip signal to breaker.This method avoid a part of instantaneous
Property failure cause breaker in short-term separating brake, close a floodgate, increase the active time of breaker, while avoiding reclosing to being
Bring of uniting impact, the stability enhancing of system.
The purpose of the present invention is realized by following technical measures:
In electric system electric line, the Fault Current Limiting Device installed using route reduces transient fault breaker
The strategy of action frequency includes following committed step as shown in Figure 1:
(1) in the power system, it when line failure, is installed in the Fault Current Limiting Device investment at line outlet and transports
Row, fault current limiting judge the fault severity level occurred according to fault degree criterion.
(2) if fault degree criterion Judging fault degree is not serious (F1=1), then by circuit relay protection device to disconnected
Road device issues trip signal delay Δ t, and the differentiation of fault detection criterion is carried out after delay time.
(3) if fault degree criterion Judging fault degree is serious (F1=0), then circuit relay protection device is without delay
Δ t directly issues trip signal, circuit breaker trip, isolated fault to breaker.
(4) after Judging fault degree is not serious, by pre-set delay Δ t, according to fault detection criterion, judgement
Whether failure still remains.If fault detection criterion Judging fault has disappeared (F2=1), illustrate that the failure is fault degree
Not serious and short duration transient fault, then circuit relay protection device does not send trip command to breaker, reduces
Transient fault circuit breaker trip number；If fault detection criterion Judging fault still has (F2=0), illustrate the failure
For the transient fault or permanent fault that fault degree is not serious and the duration is long, then circuit relay protection device is to disconnected
Road device sends trip command, circuit breaker trip, isolated fault.
Specifically:
1, fault degree criterion F1 is selected.To avoid serious failure to system shock, this method should be able to be quickly and easily
Differentiation is made to fault degree, judges whether protective device is delayed as quickly as possible and sends trip command to breaker.
As shown in Figure 2 for the alternating-current system structure containing four feeder lines.When ground fault occurs on feeder line 1,
After detecting failure, line fault current limiter puts into operation rapidly, limits capacity of short circuit.
The differentiation of fault degree can be quickly made when occurring in view of failure, as far as possible by the failure of seriousness quickly every
From the fault degree method of discrimination setting of the present embodiment are as follows: the electric current I that will be acquired at Fault Current Limiting DevicefWith the route of setting
The maximum short circuit current I that various kinds of equipment can be bornset1Carry out amplitude com parison, it may be assumed that
2, setting protective relaying device issues the delay Δ t of trip signal to breaker.It must be protected in the delay time
Card route various kinds of equipment is affected by faults less.If setting delay is excessive, the equipment damage in route may cause, to confession
Electricity generates extreme influence；If setting delay is too small, the metering function of Fault Current Limiting Device is not made full use of, when part continues
Between short, little to electric network influencing transient fault can make breaker in short-term separating brake, close a floodgate, increase the loss of breaker,
Also secondary pulse can be brought when reclosing to system, reduces the stability of route operation.
3, fault detection criterion F2 is selected.After the Δ t that is delayed, judge whether failure disappears.Will quickly to still have
Fault Isolation, the present embodiment fault detection criterion setting are as follows: the electric current I that will be acquired at Fault Current Limiting DevicefWith setting
Setting valve Iset2Carry out amplitude com parison, it may be assumed that
Wherein, Iset2=KIn(K≥1)。
According to fault degree method of discrimination above and fault detection method, the accident analysis that feeder line 1 occurs can be obtained respectively
Breaker point/combined floodgate timing is as shown in Figure 3 in the case of kind.Wherein HCB represents the state of breaker, and " 1 " indicates conducting, " 0 " table
Show disconnection.tfMoment, t occurs for failure0At the time of to detect feeder fault, t1、t2、t3And t4For the breaker open operation moment,
tr1With tr2For breaker Reclosing Instant, Δ t is the delay time that line protective devices send trip command to breaker, Δ tr
For the built-in electrical insulation intensity recovery time of breaker.For not serious failure (F1=1), in t1Moment delay circuit protection dress
It sets to breaker and sends trip command, after Δ t, if failure has disappeared (F2=1), breaker is non-shut-brake, otherwise t3When
Breaker open operation is carved, by dielectric recovery time Δ trAfterwards, in tr2Moment, breaker reclosing, if failure is instantaneity
Failure, then reclosing success；If failure is permanent fault, in t4Moment, breaker open operation, isolated fault.For serious
Failure (F1=0), in t1Moment breaker open operation, by dielectric recovery time Δ trAfterwards, in tr1Moment, open circuit are thought highly of
It closes a floodgate, if failure is transient fault, reclosing success；If failure is permanent fault, in t2Moment, breaker point
Lock, isolated fault.
By Fig. 3 (a) it is found that working as F1=1, when F2=1, illustrate that failure is the wink that fault degree is not serious and the duration is short
When property failure, then the breaker of transformer outlet has been at "on" position during failure.This illustrates that fault current limiter can
The outage capacity effectively occurred on limitation feeder line 1, maintains the quite high residual voltage of bus W, avoids the open circuit in the exit transformer T
Device tripping reduces the influence that 1 failure of feeder line operates normally feeder line to other, and the power supply of other feeder lines is not interrupted, and improves power supply
Reliability.Fig. 3 (b) and (c) are breaker point/combined floodgate timing diagram that fault degree is not serious and trouble duration is long, Fig. 3
(d) and (e) is the serious breaker of fault degree point/combined floodgate timing diagram.
The logic that transient fault tripping times are reduced in the present invention is as shown in Figure 4.When fault degree criterion is F1=1
When, after the trip command delay Δ t that protective relaying device is issued to breaker, carries out failure and whether disappear judgement.Work as failure
When detection criteria F2=1, illustrate that failure has disappeared and failure is duration short transient fault, breaker is non-shut-brake, female
Line W continues to power to other feeder lines.
Since the probability of transient fault in exchange electric line failure is up to 90%, the duration is very of short duration, several
Millisecond was differed by several seconds, it is seen that the present invention was mentioned reduces transient fault circuit breaker trip number using Fault Current Limiting Device
Method can reduce fault outage range, the greatly stability of guarantee power supply reliability and AC system.
The important technology of the measure requires as follows:
A, certain lower fault degree criterion for ease of description, is put into F1 generation table Fault Current Limiting Device herein, and enables F1
With following meaning:
" 1 " and " 0 " herein represents the state value under logical relation.Selection about fault degree criterion F1 is not clear
Limitation, but should be able to quickly make fault degree differentiation, be isolated big failure is endangered to power grid as early as possible.
For example, can choose fault degree distinguishing rule after current amplitude comparison method puts into operation for fault current limiter,
When criterion is " fault degree is not serious ", F1 is " 1 ":
If IfFor line fault electric current, Iset1It is each on route for the maximum short circuit current that various kinds of equipment on route can be born
The maximum short circuit current that equipment can be born is respectively Imax1、Imax2、Imax3……
Then Iset1Value meet following formula:
Iset1=min { Imax1,Imax2,Imax3,...}
F1 has following meaning:
B, delay time Δ t
Δ t indicates that protective relaying device issues the delay time of trip signal to breaker.About Δ t setting without clear
Limitation, but should ensure that grid equipment is influenced less in the delay time by failure.
For example, I can be usedset1To set delay time Δ t.If each equipment is in setting valve I on routeset1Under can be after reforwarding
The capable time is respectively Δ t1、Δt2、Δt3…
Then the value of Δ t meets following formula:
Δ t=min { Δ t1,Δt2,Δt3,...}
C, F2 representing fault detection criteria for ease of description, is used herein, and enables F2 that there is following meaning:
" 1 " and " 0 " herein represents the state value under logical relation.Selection about fault detection criterion F2 is not clear
Limitation, but generally alternating current circuit failure is required to remove within a few tens of milliseconds, so it should ensure that AC fault is removed quick
Property.
For example, can choose current amplitude comparison method for fault detection criterion, when criterion is " failure has disappeared ", F2
For " 1 ":
If setting valve Iset2For judging after the Δ t that is delayed, failure whether there is.If InFor route maximum overload electric current,
K is nargin coefficient (K >=1).
Then Iset2Value meet following formula:
Iset2=KIn
F2 has following meaning:
D, the installation position selection of line fault current-limiting apparatus
Make failure current limit range as big as possible under the premise of meeting the current limitation effect of current-limiting apparatus, line fault current-limiting apparatus
Often it is installed in route beginning.When any position of this route is broken down, current-limiting apparatus can quickly be put into, and play limitation event
Hinder the effect of electric current, maintain the quite high residual voltage of bus, reduces influence of the failure to adjacent lines, advantageously ensure that adjacent lines
Power supply reliability.
E, the control strategy of line fault current-limiting apparatus
Generally require control strategy simple, high reliablity.In order to play the effect of Fault Current Limiting Device, normally transported in route
When row, control strategy should be able to make current-limiting apparatus that Low ESR or zero impedance be presented, and almost without power consumption, the influence to system can
To ignore.After the failure occurred, it should be able to make current-limiting apparatus is non-delay in a very short period of time to automatically engage, be arrived in fault current
Effective limiting short-circuit current before up to first peak value.
Claims (3)
1. a kind of method for reducing circuit breaker trip number using Fault Current Limiting Device characterized by comprising
When line failure in electric system, the Fault Current Limiting Device being installed at line outlet is made to put into operation, limited
Fault current；
According to fault degree criterion, the fault severity level occurred is judged, including
If fault degree criterion Judging fault degree is serious, circuit relay protection device is enabled to issue trip command isolation to breaker
Failure；
If fault degree criterion Judging fault degree is not serious, circuit relay protection device is enabled to issue tripping delay life to breaker
It enables；After delay time, according to fault detection criterion, judge whether failure still remains, including
If failure has disappeared, circuit relay protection device does not send trip command to breaker；
If failure still has, circuit relay protection device sends trip command isolated fault to breaker.
2. a kind of method for reducing circuit breaker trip number using Fault Current Limiting Device as described in claim 1, feature exist
In: the fault degree criterion is
Wherein, F1=0 indicates that fault degree is serious, and F1=1 indicates that fault degree is not serious；
IfFor the line fault electric current of Fault Current Limiting Device, Iset1For the maximum short circuit current that various kinds of equipment on route can be born,
That is Iset1=min { Imax1,Imax2,Imax3... }, wherein Imax1、Imax2、Imax3... it can be born respectively for various kinds of equipment on route
Maximum short circuit current.
3. a kind of method for reducing circuit breaker trip number using Fault Current Limiting Device as described in claim 1, feature exist
In: the fault detection criterion is
Wherein, F2=0 indicates that failure still has, and F2=1 indicates that failure has disappeared；
IfFor the line fault electric current of Fault Current Limiting Device, Iset2For setting valve,
Iset2=KIn, wherein K is nargin coefficient, K >=1；InFor route maximum overload electric current.
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| CN201910714008.7A CN110416982A (en) | 2019-08-03 | 2019-08-03 | A method of circuit breaker trip number is reduced using Fault Current Limiting Device |
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| CN201910714008.7A CN110416982A (en) | 2019-08-03 | 2019-08-03 | A method of circuit breaker trip number is reduced using Fault Current Limiting Device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112180205A (en) * | 2020-08-28 | 2021-01-05 | 南京国电南自软件工程有限公司 | Intelligent distributed single-phase grounding line selection method and system for power distribution network |
| CN112180205B (en) * | 2020-08-28 | 2024-05-28 | 南京国电南自软件工程有限公司 | Intelligent distributed single-phase grounding line selection method and system for power distribution network |
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| CN107005042A (en) * | 2014-11-26 | 2017-08-01 | 西门子公司 | Configurable breaker |
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Application publication date: 20191105 |