CN109470992A - A kind of line fault of electrical power system recognition methods and device - Google Patents
A kind of line fault of electrical power system recognition methods and device Download PDFInfo
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- CN109470992A CN109470992A CN201811266570.XA CN201811266570A CN109470992A CN 109470992 A CN109470992 A CN 109470992A CN 201811266570 A CN201811266570 A CN 201811266570A CN 109470992 A CN109470992 A CN 109470992A
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000001052 transient effect Effects 0.000 claims abstract description 161
- 238000010276 construction Methods 0.000 abstract description 3
- 230000004888 barrier function Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 206010001541 Akinesia Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
Abstract
The present invention provides a kind of line fault of electrical power system recognition methods and device, and method includes the difference of any two-phase transient current in the three-phase transient current and three-phase transient current for obtain analog line；Fault identification preset value is determined according to the difference of two-phase transient current any in the three-phase transient current and three-phase transient current of the analog line；The difference of two-phase transient current any in the three-phase transient current and three-phase transient current of route to be identified is compared with corresponding fault identification preset value respectively, to realize the fault identification to the route to be identified；The recognition speed compared with using instantaneous current value criterion merely is fast using biphase current difference and three-phase instantaneous current value as fault identification criterion by the present invention；The criterions such as current slope, curvature are not introduced in recognition methods, recognition result is influenced small by harmonic wave interference；Not comprising complicated algorithm, calculates simply, be convenient for engineering construction.
Description
Technical field
The invention belongs to electric power system faults to identify field, and in particular to a kind of line fault of electrical power system recognition methods and
Device.
Background technique
As modern power systems continue to develop, the short circuit current level in power grids at different levels constantly increases, and line short can
It can cause to seriously endanger, even more than circuit breaker interrupting capacity, cause hardly imaginable consequence.Improve voltage class, using string
Although the conventional currents restriction technologies such as connection reactance can inhibit the short circuit current of system to a certain extent, all can be to the normal of system
Operation adversely affects.Become the new way for solving short circuit current excessive problem using fault current limiter, its main feature is that
Zero impedance or Low ESR are presented when power grid operates normally, impedance increases rapidly when short trouble occurs for power grid, reaches quick
The purpose of limiting short-circuit current.After short trouble occurs, for limiting short-circuit current, need to put into the shortest possible time
Fault current limiter, so rapidly and accurately identifying that short trouble is the key factor of fault current limiter using effect
One of.
Requirement according to electric system to fault current limiter, when single-phase fault occurs for route, faulted phase current limit
Device processed must act, non-faulting phase current limiter akinesia；When multiphase failure occurs for route, three-phase current limiter must be moved
Make.Therefore, fault-signal method for quickly identifying needs accurately and quickly to judge whether line fault occurs, and whether certain is mutually single-phase
The non-faulting phase of failure.Currently, many to the fault-signal fast recognition technology research of fault current limiter both at home and abroad: using
It is most common method that current instantaneous value, which carries out identification, but recognition speed is not fast enough；It is carried out using current slope or waveform curvature
Identification, fast speed, but influence from harmonic is larger, need to configure filter, calculates more complex；Electric current definite integral has very strong anti-dry
Immunity, Resonance Wave Composition influences very little on it in line current, but identifies sometimes fast and sometimes slow, can be used as a kind of standby recognition methods.Though
There are many method for quickly identifying of right fault current, but how quickly, accurately and reliably identification fault current is still a needs
The problem of extensively and profoundly studying.
Summary of the invention
A kind of line fault of electrical power system recognition methods provided by the invention and device, it is therefore an objective to according to two-phase transient current
Difference and three-phase instantaneous current value judge the fault condition of route.
To achieve the above object, the invention adopts the following technical scheme:
The present invention provides a kind of line fault of electrical power system recognition methods, it is improved in that the described method includes:
Obtain the difference of any two-phase transient current in the three-phase transient current and three-phase transient current of analog line；
According to the difference of two-phase transient current any in the three-phase transient current and three-phase transient current of the analog line
Determine fault identification preset value；
The difference of two-phase transient current any in the three-phase transient current and three-phase transient current of route to be identified is distinguished
It is compared with corresponding fault identification preset value, to realize the fault identification to the route to be identified.
Preferably, any two-phase is instantaneous in the three-phase transient current and three-phase transient current according to the analog line
The difference of electric current determines fault identification preset value, comprising:
Determine that Fisrt fault identifies preset value according to the three-phase transient current of the analog line；
Determine that the second failure is known according to the difference of two-phase transient current any in the three-phase transient current of the analog line
Other preset value.
Further, the Fisrt fault identification preset value is that non-faulting phase when single-phase fault occurs for the analog line
Transient current peak value.
Further, the second fault identification preset value is the maximum value in following values:
When single-phase fault occurs for the analog line, in analog line in the transient current difference of two non-faulting phases most
Big value；
The analog line carries busy hour, the maximum value in analog line three-phase in two-phase transient current difference；
Maximum value outside the analog line when breaker actuation, in analog line three-phase in two-phase transient current difference.
Preferably, in the three-phase transient current and three-phase transient current by route to be identified two-phase transient current difference
Value is compared with corresponding fault identification preset value respectively, to realize the identification to the line fault situation to be identified.
When meeting following either condition, then line failure to be identified is judged:
The phase transient current of the route to be identified is greater than the Fisrt fault and identifies preset value；
The phase transient current of the route to be identified is all larger than the second event with the difference of other two-phase transient current respectively
Barrier identification preset value；
The other two-phase transient current of the route to be identified is all larger than the Fisrt fault identification preset value；
The route to be identified this be mutually greater than with the transient current difference of certain other phase the second fault identification preset value and
Third phase transient current is greater than the Fisrt fault and identifies preset value；
Wherein, the line failure to be identified include this mutually occur two-phase in single-phase fault or three-phase break down or
Three-phase breaks down.
The present invention provides a kind of line fault of electrical power system identification device, it is improved in that described device includes:
Preset value determining module, any two-phase in the three-phase transient current and three-phase transient current for obtaining analog line
The difference of transient current, and it is instantaneously electric according to two-phase any in the three-phase transient current and three-phase transient current of the analog line
The difference of stream determines fault identification preset value；
Fault identification module, for two-phase wink any in the three-phase transient current and three-phase transient current by route to be identified
When electric current difference be compared respectively with corresponding fault identification preset value, the failure of the route to be identified is known with realizing
Not.
Preferably, the preset value determining module is used for:
Determine that Fisrt fault identifies preset value according to the three-phase transient current of the analog line；
Determine that the second failure is known according to the difference of two-phase transient current any in the three-phase transient current of the analog line
Other preset value.
Further, the Fisrt fault identification preset value is that non-faulting phase when single-phase fault occurs for the analog line
Transient current peak value.
Further, the second fault identification preset value is the maximum value in following values:
When single-phase fault occurs for the analog line, in analog line in the transient current difference of two non-faulting phases most
Big value；
The analog line carries busy hour, the maximum value in analog line three-phase in two-phase transient current difference；
Maximum value outside the analog line when breaker actuation, in analog line three-phase in two-phase transient current difference.
Preferably, the fault identification module is used for: when meeting following condition, then judging that event occurs for route to be identified
Barrier:
The phase transient current of the route to be identified is greater than the Fisrt fault and identifies preset value；
The phase transient current of the route to be identified is all larger than the second event with the difference of other two-phase transient current respectively
Barrier identification preset value；
The other two-phase transient current of the route to be identified is all larger than the Fisrt fault identification preset value；
The route to be identified this be mutually greater than with the transient current difference of certain other phase the second fault identification preset value and
Third phase transient current is greater than the Fisrt fault and identifies preset value；
Wherein, the line failure to be identified include this mutually occur two-phase in single-phase fault or three-phase break down or
Three-phase breaks down.
Compared with the nearest prior art, technical solution provided by the invention has following excellent effect
A kind of line fault of electrical power system recognition methods provided by the invention and device, the three-phase of route to be identified is instantaneous
The difference of two-phase transient current is compared with corresponding fault identification preset value respectively in electric current and three-phase transient current, with reality
Now to the fault identification of the route to be identified, using biphase current difference and three-phase instantaneous current value as fault identification criterion and list
It is pure fast compared to recognition speed using instantaneous current value criterion；Do not introduce the criterions such as current slope, curvature in method, recognition result by
Harmonic wave interference influences small；Not comprising complicated algorithm, calculates simply, be convenient for engineering construction.
Detailed description of the invention
Fig. 1 is line fault recognition methods flow chart of the present invention；
Fig. 2 is simulation circuit structure figure of the embodiment of the present invention；
Fig. 3 is line fault identification device structure chart of the present invention.
Specific embodiment
Below with reference to embodiment, the invention will be described in further detail.
As shown in Figure 1, the present invention provides a kind of line fault of electrical power system recognition methods, method includes:
Step 1, the difference for obtaining any two-phase transient current in the three-phase transient current and three-phase transient current of analog line
Value；
Step 2, according to two-phase transient current any in the three-phase transient current and three-phase transient current of the analog line
Difference determine fault identification preset value；
Step 3, by the difference of two-phase transient current any in the three-phase transient current and three-phase transient current of route to be identified
Value is compared with corresponding fault identification preset value respectively, to realize the fault identification to the route to be identified.
In the line fault recognition methods, step 1 specifically:
Simulation circuit structure figure of the embodiment of the present invention as shown in Figure 2, ea、eb、ecWith e 'a、e′b、e′cFor three phase mains, R
+ R ' and L+L ' is respectively the resistance and inductance of every phase, ia、ibAnd icRespectively three-phase current obtains analog line from Fig. 2
The difference of any two-phase transient current in three-phase transient current and three-phase transient current.
In step 2 specifically:
Determine that Fisrt fault identifies preset value according to the three-phase transient current of the analog line；
Determine that the second failure is known according to the difference of two-phase transient current any in the three-phase transient current of the analog line
Other preset value.
Wherein, non-faulting phase is instantaneous when the Fisrt fault identification preset value is analog line generation single-phase fault
Current peak；
The second fault identification preset value is the maximum value in following values:
When single-phase fault occurs for the analog line, in analog line in the transient current difference of two non-faulting phases most
Big value；
The analog line carries busy hour, the maximum value in analog line three-phase in two-phase transient current difference；
Maximum value outside the analog line when breaker actuation, in analog line three-phase in two-phase transient current difference.
Fault identification principle of the present invention are as follows:
Three-phase current is respectively ia、ibAnd ic, when short trouble occurs for A phase, according to principle of stacking, there is ia=ia0+ia1、
ib=ib0+ib1And ic=ic0+ic1, wherein ia0、ib0And ic0Respectively system stable operation when three-phase current, ia1、ib1With
ic1The three short circuit current component being respectively superimposed after singlephase earth fault.
Due to the symmetry of Three-phase Power Systems, after single-phase fault occurs for A phase, B, C superimposed short circuit current is equal, i.e.,
ib1=ic1, at this time the difference of B, C phase current be
In formula, three-phase current virtual value when I is system stable operation, ω is that system runs angular frequency,For at the beginning of A phase current
Phase.
It can be seen that in the symmetrical situation of Three-phase Power Systems, when A phase single phase ground fault failure, although B, C
Phase current has been superimposed short circuit current, but the current difference of the two is unaffected, and still maintains standard sine wave.And for single-phase
In failure when the current difference and multiphase failure of failure phase and non-faulting phase two-phase current difference, peak value can be greater than steady-state operation
When peak value the fault condition of electric system therefore can be judged with biphase current difference.
Step 3 specifically:
According to the comparison result and/or institute of the three-phase transient current of the route to be identified and Fisrt fault identification preset value
The difference of any two-phase transient current in the three-phase transient current of route to be identified is stated compared with the second fault identification preset value
As a result judge the fault condition of the route to be identified.
Specific recognition methods includes: in step 3
When meeting following either condition, then line failure to be identified is judged:
The phase transient current of the route to be identified is greater than the Fisrt fault and identifies preset value；
The phase transient current of the route to be identified is all larger than the second event with the difference of other two-phase transient current respectively
Barrier identification preset value；
The other two-phase transient current of the route to be identified is all larger than the Fisrt fault identification preset value；
The route to be identified this be mutually greater than with the transient current difference of certain other phase the second fault identification preset value and
Third phase transient current is greater than the Fisrt fault and identifies preset value；
Wherein, the line failure to be identified include this mutually occur two-phase in single-phase fault or three-phase break down or
Three-phase breaks down.
The present invention provides specific embodiment (for the A phase in three-phase circuit) according to the above technical scheme:
Fisrt fault is identified into preset value Iset1It is set as the wink that two non-faulting phases when single-phase fault occur for analog line
When current maxima；By the second fault identification preset value Iset2It is set as analog line and two non-faulting phases when single-phase fault occurs
Transient current maximum value in difference, maximum in two-phase transient current difference in analog line carrying busy hour three-phase
Maximum value outside value and the route when breaker actuation in this route three-phase in two-phase transient current maximum value in difference three.
Judgment method includes:
When meeting following condition, then multiphase failure or A phase singlephase earth fault occur for route to be identified:
|ia| > Iset1；
|ia-ib| > Iset2And | ic-ia| > Iset2；
When meeting following either condition, then judge that multiphase failure occurs for route to be identified:
|ib| > Iset1And | ic| > Iset1；
|ib| > Iset1And | ic-ia| > Iset2, or | ic| > Iset1And | ia-ib| > Iset2；
In above 4 conditions, any one condition is set up, and can determine whether that A phase singlephase earth fault or ABC three-phase occur for route
Middle two-phase breaks down or ABC three-phase breaks down.
As shown in figure 3, the present invention provides a kind of line fault of electrical power system identification device, device includes:
Preset value determining module, any two-phase in the three-phase transient current and three-phase transient current for obtaining analog line
The difference of transient current, and it is instantaneously electric according to two-phase any in the three-phase transient current and three-phase transient current of the analog line
The difference of stream determines fault identification preset value；
Fault identification module, for two-phase wink any in the three-phase transient current and three-phase transient current by route to be identified
When electric current difference be compared respectively with corresponding fault identification preset value, the failure of the route to be identified is known with realizing
Not.
Preset value determining module in device is used for:
Determine that Fisrt fault identifies preset value according to the three-phase transient current of the analog line；
Determine that the second failure is known according to the difference of two-phase transient current any in the three-phase transient current of the analog line
Other preset value.
Wherein, non-faulting phase is instantaneous when the Fisrt fault identification preset value is analog line generation single-phase fault
Current peak；
The second fault identification preset value is the maximum value in following values:
When single-phase fault occurs for the analog line, in analog line in the transient current difference of two non-faulting phases most
Big value；
The analog line carries busy hour, the maximum value in analog line three-phase in two-phase transient current difference；
Maximum value outside the analog line when breaker actuation, in analog line three-phase in two-phase transient current difference.
Fault identification module in device is specifically used for:
According to the comparison result and/or institute of the three-phase transient current of the route to be identified and Fisrt fault identification preset value
The difference of any two-phase transient current in the three-phase transient current of route to be identified is stated compared with the second fault identification preset value
As a result judge the fault condition of the route to be identified.
Fault identification module recognition method is, when meeting following either condition, then judges line failure:
The phase transient current of the route to be identified is greater than the Fisrt fault and identifies preset value；
The phase transient current of the route to be identified is all larger than the second event with the difference of other two-phase transient current respectively
Barrier identification preset value；
The other two-phase transient current of the route to be identified is all larger than the Fisrt fault identification preset value；
The route to be identified this be mutually greater than with the transient current difference of certain other phase the second fault identification preset value and
Third phase transient current is greater than the Fisrt fault and identifies preset value；
Wherein, the line failure to be identified include this mutually occur two-phase in single-phase fault or three-phase break down or
Three-phase breaks down.
In conclusion a kind of line fault of electrical power system recognition methods provided by the invention and device, by route to be identified
Three-phase transient current and three-phase transient current in two-phase transient current difference respectively with corresponding fault identification preset value into
Row compares, to realize the fault identification to the route to be identified；Using biphase current difference and three-phase instantaneous current value as failure
Identical criterion recognition speed compared with using instantaneous current value criterion merely is fast；Current slope, curvature etc. are not introduced in method to sentence
According to being influenced by harmonic wave interference small；Not comprising complicated algorithm, calculates simply, be convenient for engineering construction.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, institute
The those of ordinary skill in category field is although should be understood with reference to the above embodiments: still can be to a specific embodiment of the invention
It is modified or replaced equivalently, these are without departing from any modification of spirit and scope of the invention or equivalent replacement, in Shen
Within claims of the invention that please be pending.
Claims (10)
1. a kind of line fault of electrical power system recognition methods, which is characterized in that the described method includes:
Obtain the difference of any two-phase transient current in the three-phase transient current and three-phase transient current of analog line；
It is determined according to the difference of two-phase transient current any in the three-phase transient current and three-phase transient current of the analog line
Fault identification preset value；
By the difference of two-phase transient current any in the three-phase transient current and three-phase transient current of route to be identified respectively with phase
The fault identification preset value answered is compared, to realize the fault identification to the route to be identified.
2. the method as described in claim 1, which is characterized in that described according to the three-phase transient current of the analog line and three
The difference of any two-phase transient current determines fault identification preset value in phase transient current, comprising:
Determine that Fisrt fault identifies preset value according to the three-phase transient current of the analog line；
Determine that the second fault identification is pre- according to the difference of two-phase transient current any in the three-phase transient current of the analog line
If value.
3. method according to claim 2, which is characterized in that the Fisrt fault identification preset value is analog line hair
When raw single-phase fault, the transient current peak value of non-faulting phase.
4. method according to claim 2, which is characterized in that the second fault identification preset value is the maximum in following values
Value:
Maximum when single-phase fault occurs for the analog line, in analog line in the transient current difference of two non-faulting phases
Value；
The analog line carries busy hour, the maximum value in analog line three-phase in any two-phase transient current difference；
Maximum value outside the analog line when breaker actuation, in analog line three-phase in any two-phase transient current difference.
5. method according to claim 2, which is characterized in that described by the three-phase transient current of route to be identified and three-phase wink
When electric current in the difference of two-phase transient current be compared respectively with corresponding fault identification preset value, to realize to described wait know
The identification of other line fault situation, comprising:
When meeting following either condition, then line failure to be identified is judged:
One phase transient current of the route to be identified is greater than the Fisrt fault and identifies preset value；
One phase transient current of the route to be identified is all larger than the knowledge of the second failure with the difference of other two-phase transient current respectively
Other preset value；
The other two-phase transient current of the route to be identified is all larger than the Fisrt fault identification preset value；
One phase of the route to be identified and the transient current difference of a phase in other two-phase are greater than the second fault identification preset value
And in addition another phase transient current is greater than Fisrt fault identification preset value in two-phase；
Wherein, the line failure to be identified includes that this mutually occurs two-phase in single-phase fault or three-phase and breaks down or three-phase
Break down.
6. a kind of line fault of electrical power system identification device, which is characterized in that described device includes:
Preset value determining module, any two-phase is instantaneous in the three-phase transient current and three-phase transient current for obtaining analog line
The difference of electric current, and according to two-phase transient current any in the three-phase transient current and three-phase transient current of the analog line
Difference determines fault identification preset value；
Fault identification module, it is instantaneously electric for two-phase any in the three-phase transient current and three-phase transient current by route to be identified
The difference of stream is compared with corresponding fault identification preset value respectively, to realize the fault identification to the route to be identified.
7. device as claimed in claim 6, which is characterized in that the preset value determining module is used for:
Determine that Fisrt fault identifies preset value according to the three-phase transient current of the analog line；
Determine that the second fault identification is pre- according to the difference of two-phase transient current any in the three-phase transient current of the analog line
If value.
8. the method for claim 7, which is characterized in that the Fisrt fault identification preset value is analog line hair
The transient current peak value of non-faulting phase when raw single-phase fault.
9. the method for claim 7, which is characterized in that the second fault identification preset value is the maximum in following values
Value:
Maximum when single-phase fault occurs for the analog line, in analog line in the transient current difference of two non-faulting phases
Value；
The analog line carries busy hour, the maximum value in analog line three-phase in any two-phase transient current difference；
Maximum value outside the analog line when breaker actuation, in analog line three-phase in any two-phase transient current difference.
10. the method for claim 7, which is characterized in that the failure feelings of fault identification module route for identification
Condition:
When meeting following either condition, then line failure to be identified is judged:
The phase transient current of the route to be identified is greater than the Fisrt fault and identifies preset value；
The phase transient current of the route to be identified is all larger than the knowledge of the second failure with the difference of other two-phase transient current respectively
Other preset value；
The other two-phase transient current of the route to be identified is all larger than the Fisrt fault identification preset value；
This of the route to be identified is mutually greater than the second fault identification preset value and third with the transient current difference of certain other phase
Phase transient current is greater than Fisrt fault identification and pre-sets；
Wherein, the line failure to be identified includes that this mutually occurs two-phase in single-phase fault or three-phase and breaks down or three-phase
Break down.
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| 胡婷;游大海;金明亮;: "一种电流突变量选相元件三相短路判据的探讨", 电力自动化设备, vol. 26, no. 10, pages 107 - 109 * |
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