CN104977499A - Small current grounding system single-phase grounding fault line selection method - Google Patents
Small current grounding system single-phase grounding fault line selection method Download PDFInfo
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Abstract
The present invention provides a small current grounding system single-phase grounding fault line selection method which comprises the steps of (1) building a power distribution network single-phase grounding fault line selection criterion set P, (2) analyzing the confidence level G corresponding to the line selection criterion in the criterion set P, (3) obtaining the fault characteristic of a single-phase grounding fault, (4) calculating the fault measure H of all power distribution network feeders corresponding to the line selection criterion according to the fault characteristic, and (5) determining a fault feeder. Compared with the prior art, the invention provides the small current grounding system single-phase grounding fault line selection method, the condition that a local fault characteristic is easily interfered by an environment and is affected by the precision of a measuring device is avoided, the problem of low credibility of single diagnostic criterion conclusion is overcome, the reliability and universality of the single-phase grounding fault line selection method are improved, and the method has a practical value.
Description
Technical field
The present invention relates to field of power, be specifically related to a kind of single-phase ground fault line selecting method of small-electric current grounding system.
Background technology
Power distribution network many employings small current neutral grounding mode, and singlephase earth fault is one of fault that wherein occurrence frequency is the highest.Due to the not direct ground connection of neutral point, the fault paths resistance value that singlephase earth fault is formed is larger, the fault signature caused is not obvious, simultaneously due to problems such as the interference of noise and the impacts of power distribution network operation conditions (as asymmetry), study widely for a long time although existing single-phase ground fault line selecting method of small-electric current grounding system have passed through, still Shortcomings in reliability and universality.
The electric parameters change that singlephase earth fault in power distribution network causes is faint; usually protection act can not be caused; and its power distribution network operational factor balance phenomenon caused easily is obscured mutually with power distribution network self three-phase imbalance operation characteristic, therefore singlephase earth fault is often missed and flase drop.In addition, under different fault close angles, transition resistance value and power distribution network operation conditions, the electric parameters that singlephase earth fault causes characterizes complicated various, and tradition characterizes based on local fault and is difficult to all realize reliable location to all situations of such fault with the method for diagnosing faults of single criterion.
Based on the difference of the characteristic quantity of institute's foundation, at present, fault line selection method for single-phase-to-ground fault can be divided three classes: signal injection method, steady-state quantity route selection method and transient route selection method.Wherein, signal injection method needs additional signal device, and Project Realization is complicated, steady-state quantity route selection method, and signals collecting is easy, but existing characteristics weak output signal, the problem that route selection result reliability is lower.And larger than steady-state value several times even tens times of the transient characteristic of transient route selection method institute foundation, and not by the impact of arc suppression coil, without the need to adding extras, therefore there is higher reliability and using value.But, in transient except fault-signal, also mix other polymorphic type signal, directly applied, easily cause erroneous judgement.
To sum up, existing fault line selection method for single-phase-to-ground fault is many to be characterized based on local fault, adopts single criterion to diagnose, therefore needs to provide a kind of single-phase ground fault line selecting method of small-electric current grounding system that can adapt to all kinds of operation of power networks situation.
Summary of the invention
In order to meet the needs of prior art, the invention provides a kind of single-phase ground fault line selecting method of small-electric current grounding system.
Technical scheme of the present invention is:
Described method comprises:
Step 1: build Single-phase Earth-fault Selection in Distribution Systems criterion set P={p
1, p
2..., p
i..., p
n, N is the number of route selection criterion;
Step 2: analyze the degree of confidence G={g that in described route selection criterion set P, route selection criterion is corresponding
1, g
2..., g
i..., g
n;
Step 3: the fault signature obtaining described singlephase earth fault, described fault signature comprises fault and moment, fault transient component, fault steady-state component and power distribution network three-phase imbalance operation component occurs;
Step 4: the fault measurement H={h calculating all distribution feeders corresponding to route selection criterion according to described fault signature
i1, h
i2..., h
ij..., h
iM, h
ijfor foundation route selection criterion p
ianalyze distribution feeder l
jthe probability of upper generation singlephase earth fault, M is the number of distribution feeder;
Step 5: according to the degree of confidence of route selection criterion and the probability of happening h={h of fault measurement calculating distribution feeder generation singlephase earth fault
1, h
2..., h
j..., h
m, then determine that the distribution feeder corresponding with probability of happening h maximal value is fault feeder.
Preferably, analyze the degree of confidence G that route selection criterion is corresponding in described step 2, comprising: determine each applicable elements of route selection criterion and the running environment of power distribution network, more described applicable elements and running environment, thus obtain degree of confidence corresponding to each route selection criterion;
Preferably, before obtaining the fault signature of singlephase earth fault in described step 3, comprising:
The busbar voltage of Real-Time Monitoring power distribution network, judges whether power distribution network breaks down: if the residual voltage U of bus
0>=kU
nthen power distribution network breaks down, and starts the fault signature gathering power distribution network; U
nfor the rated voltage of bus, k is voltage threshold coefficient;
Preferably, calculate the fault measurement H of distribution feeder in described step 4, comprising:
Step 4-1: the sequence number i=1 of setting failure line selection criterion;
Step 4-2: calculate route selection criterion p
ithe fault measurement h of corresponding all distribution feeders
ij;
Step 4-3: setting i=i+1;
Step 4-4: if described i < N+1, then return step 4-2, if described i=N+1, then performs step 5;
Preferably, calculate the probability of happening h of distribution feeder generation singlephase earth fault in described step 5, comprising:
Step 5-1: the sequence number j=1 of setting distribution feeder;
Step 5-2: calculate distribution feeder l
jthere is the probability of happening of singlephase earth fault
Step 5-3: setting j=j+1;
Step 5-4: if described j < M+1, then return step 5-2, if described j=M+1, then performs step 5-5;
Step 5-5: the maximal value max (h) obtaining the probability of happening h of distribution feeder generation singlephase earth fault, obtains fault feeder.
Compared with immediate prior art, excellent effect of the present invention is:
A kind of single-phase ground fault line selecting method of small-electric current grounding system provided by the invention, utilize multiclass fault signature, comprehensive many criterions conclusion, carry out singlephase earth fault diagnosis, on the one hand, avoid the situation generation that local fault feature is subject to environmental interference and measuring equipment Accuracy etc., on the other hand, overcome the credible low problem of single diagnosis criterion conclusion, simultaneously, take into full account the adaptability difference of all kinds of failure line selection criterion to different power distribution network operation conditions, improve reliability and the universality of fault line selection method for single-phase-to-ground fault, possesses practical value.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further described.
Fig. 1: a kind of single-phase ground fault line selecting method of small-electric current grounding system process flow diagram in the embodiment of the present invention;
Fig. 2: the small current neutral grounding power distribution network topological diagram comprising singlephase earth fault in the embodiment of the present invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
A kind of single-phase ground fault line selecting method of small-electric current grounding system provided by the invention, adopt Decision fusion technology, based on multiclass fault signature, consider that failure line selection criterion is to the adaptability difference of different power distribution network operation conditions, merge the diagnostic result of multiple route selection criterion, obtain well-determined failure line selection conclusion.
One, in the present embodiment, the step of fault-line selecting method as shown in Figure 1, is specially:
1, Single-phase Earth-fault Selection in Distribution Systems criterion set P is built
Route selection criterion set P={p
1, p
2..., p
i..., p
n, N is the number of route selection criterion, and wherein route selection criterion is the conventional route selection criterion of one-phase earthing failure in electric distribution network in electric system, chooses different route selection criterions according to different operating mode by technician.
2, the degree of confidence G that in described route selection criterion set P, route selection criterion is corresponding is analyzed
Degree of confidence G={g is analyzed in the present embodiment
1, g
2..., g
i..., g
ncomprise:
Determine each applicable elements of route selection criterion and the running environment of power distribution network, compare applicable elements and running environment, thus obtain degree of confidence corresponding to each route selection criterion.
3, the fault signature of singlephase earth fault is obtained
The busbar voltage of Real-Time Monitoring power distribution network, judges whether power distribution network breaks down: if the residual voltage U of bus
0>=kU
nthen power distribution network breaks down, and starts the fault signature gathering power distribution network, and in the present embodiment, fault signature comprises fault generation moment, fault transient component, fault steady-state component and power distribution network three-phase imbalance operation component.
U
nfor the rated voltage of bus, k is voltage threshold coefficient.
4, the fault measurement H of all distribution feeders corresponding to route selection criterion is calculated according to described fault signature
Fault measurement H={h
i1, h
i2..., h
ij..., h
iM, h
ijfor foundation route selection criterion p
ianalyze distribution feeder l
jthe probability of upper generation singlephase earth fault, M is distribution feeder number, and concrete calculation procedure is:
(1) the sequence number i=1 of failure line selection criterion is set;
(2) route selection criterion p is calculated
ithe fault measurement h of corresponding all distribution feeders
ij;
According to the different principle of each route selection criterion in the present embodiment, choose corresponding different calculation methods and calculate fault localization.
(3) i=i+1 is set;
(4) if i < is N+1, then return step (2) and continue to calculate as i=i+1, route selection criterion p
ithe fault measurement h of corresponding all distribution feeders
ij; If i=N+1, then perform next step, start the probability of happening calculating distribution feeder generation singlephase earth fault.
5, the probability of happening h of distribution feeder generation singlephase earth fault is calculated
Calculate the probability of happening h={h of distribution feeder generation singlephase earth fault according to the degree of confidence of route selection criterion and fault measurement in the present embodiment
1, h
2..., h
j..., h
m, then determine that the distribution feeder corresponding with probability of happening h maximal value is fault feeder.Concrete steps are:
(1) the sequence number j=1 of distribution feeder is set;
(2) distribution feeder l is calculated
jthere is the probability of happening of singlephase earth fault
(3) j=j+1 is set;
(4) if j < is M+1, then return step (2) and continue to calculate as j=j+1, distribution feeder l
jthere is the probability of happening h of singlephase earth fault
jif j=M+1, obtains the maximal value max (h) of the probability of happening h of distribution feeder generation singlephase earth fault, be then namely fault feeder with this corresponding distribution feeder of max (h).
Two, for power distribution network as shown in Figure 2, assuming that K switch closes, the process realizing single-phase grounding fault line selection in small current grounding is:
1, Single-phase Earth-fault Selection in Distribution Systems criterion set P={p is built
1, p
2, p
3, p
4, p
5}
Route selection criterion p
1for, the zero-sequence current at fault feeder top is contrary with the zero-sequence current direction at non-faulting feeder line top, and the former flows to bus from feeder line, and the latter flows to feeder line from bus.
Route selection criterion p
2for, the delayed residual voltage of zero-sequence current 90 ° at fault feeder top, the advanced residual voltage of zero-sequence current 90 ° at non-faulting feeder line top.
Route selection criterion p
3for, the zero-sequence current at fault feeder top is sayed maximum from amplitude, be the zero-sequence current sum at non-faulting feeder line top.
Route selection criterion p
4for, the homopolar power at fault feeder top is contrary with the zero sequence power direction at non-faulting feeder line top, and the former flows to bus from feeder line, and the latter flows to feeder line from bus.
Route selection criterion p
5for, the homopolar power at fault feeder top is sayed maximum from amplitude, be the homopolar power sum at non-faulting feeder line top.
2, the degree of confidence G that in described route selection criterion set P, route selection criterion is corresponding is analyzed
The acquisition precision of input signal in power distribution network shown in Fig. 2 that the applicable elements of route selection criterion is each route selection criterion; The running environment condition of power distribution network is the earthing mode of power distribution network, then the degree of confidence obtaining route selection criterion as shown in table 1 corresponding is:
Table 1
| Route selection criterion | p 1 | p 2 | p 3 | p 4 | p 5 |
| Degree of confidence | 0.9 | 0.6 | 0.8 | 0.9 | 0.8 |
3, the fault signature of singlephase earth fault is obtained
The busbar voltage of Real-Time Monitoring power distribution network, judges whether power distribution network breaks down: if the residual voltage U of bus
0>=0.35U
nthen power distribution network breaks down, and starts the fault signature gathering power distribution network.
4, the fault measurement H of all distribution feeders corresponding to route selection criterion is calculated according to fault signature
According to single-phase earth fault line selection criterion P={p
1, p
2, p
3, p
4, p
5diagnosis principle, generate each feeder line L={l under each route selection criterion as shown in table 2
1, l
2, l
3, l
4corresponding fault measurement H:
Table 2
5, the probability of happening h of distribution feeder generation singlephase earth fault is calculated
For distribution feeder L={l
1, l
2, l
3, l
4and route selection criterion P={p
1, p
2, p
3, p
4, p
520 fault measurements obtaining, in conjunction with each route selection criterion degree of confidence, carry out product and add and calculate, the probability of happening obtaining distribution feeder generation singlephase earth fault as shown in table 3 is:
Table 3
| Distribution feeder | l 1 | l 2 | l 3 | l 4 |
| Fault rate | 0.91 | 2.79 | 0.97 | 0.64 |
According to the result of calculation of table 3, distribution feeder l can be determined
2for fault feeder.
Finally should be noted that: described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the application's protection.
Claims (5)
1. a single-phase ground fault line selecting method of small-electric current grounding system, is characterized in that, described method comprises:
Step 1: build Single-phase Earth-fault Selection in Distribution Systems criterion set P={p
1, p
2..., p
i..., p
n, N is the number of route selection criterion;
Step 2: analyze the degree of confidence G={g that in described route selection criterion set P, route selection criterion is corresponding
1, g
2..., g
i..., g
n;
Step 3: the fault signature obtaining described singlephase earth fault, described fault signature comprises fault and moment, fault transient component, fault steady-state component and power distribution network three-phase imbalance operation component occurs;
Step 4: the fault measurement H={h calculating all distribution feeders corresponding to route selection criterion according to described fault signature
i1, h
i2..., h
ij..., h
iM, h
ijfor foundation route selection criterion p
ianalyze distribution feeder l
jthe probability of upper generation singlephase earth fault, M is the number of distribution feeder;
Step 5: according to the degree of confidence of route selection criterion and the probability of happening h={h of fault measurement calculating distribution feeder generation singlephase earth fault
1, h
2..., h
j..., h
m, determine that the distribution feeder corresponding with probability of happening h maximal value is fault feeder.
2. the method for claim 1, it is characterized in that, the degree of confidence G that route selection criterion is corresponding is analyzed in described step 2, comprise: determine each applicable elements of route selection criterion and the running environment of power distribution network, more described applicable elements and running environment, thus obtain degree of confidence corresponding to each route selection criterion.
3. the method for claim 1, is characterized in that, before obtaining the fault signature of singlephase earth fault, comprising in described step 3:
The busbar voltage of Real-Time Monitoring power distribution network, judges whether power distribution network breaks down: if the residual voltage U of bus
0>=kU
nthen power distribution network breaks down, and starts the fault signature gathering power distribution network; U
nfor the rated voltage of bus, k is voltage threshold coefficient.
4. the method for claim 1, is characterized in that, calculates the fault measurement H of distribution feeder, comprising in described step 4:
Step 4-1: the sequence number i=1 of setting failure line selection criterion;
Step 4-2: calculate route selection criterion p
ithe fault measurement h of corresponding all distribution feeders
ij;
Step 4-3: setting i=i+1;
Step 4-4: if described i < N+1, then return step 4-2, if described i=N+1, then performs step 5.
5. the method for claim 1, is characterized in that, calculates the probability of happening h of distribution feeder generation singlephase earth fault, comprising in described step 5:
Step 5-1: the sequence number j=1 of setting distribution feeder;
Step 5-2: calculate distribution feeder l
jthere is the probability of happening of singlephase earth fault
Step 5-3: setting j=j+1;
Step 5-4: if described j < M+1, then return step 5-2, if described j=M+1, then performs step 5-5;
Step 5-5: the maximal value max (h) obtaining the probability of happening h of distribution feeder generation singlephase earth fault, obtains fault feeder.
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| CN108120903B (en) * | 2018-02-05 | 2019-05-31 | 西南交通大学 | A kind of low-current single-phase earth fault line selection method based on pulse nerve membranous system |
| CN113311288A (en) * | 2021-05-11 | 2021-08-27 | 国网浙江省电力有限公司湖州供电公司 | Small current grounding fault searching and positioning method and system |
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