CN105116290B - The localization method of single-phase grounded malfunction in grounded system of low current section - Google Patents
The localization method of single-phase grounded malfunction in grounded system of low current section Download PDFInfo
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- CN105116290B CN105116290B CN201510563630.4A CN201510563630A CN105116290B CN 105116290 B CN105116290 B CN 105116290B CN 201510563630 A CN201510563630 A CN 201510563630A CN 105116290 B CN105116290 B CN 105116290B
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Abstract
The invention discloses a kind of localization method of single-phase grounded malfunction in grounded system of low current section, faulty line has the characteristics of different zero-sequence current mutual relation of electric voltage from non-fault line when singlephase earth fault occurs using small current neutral grounding system, set is carried out to each Feeder Terminal Unit according to the phase relation of the zero-sequence current of current through line and residual voltage, and is uploaded to main website；Main website carries out logical operation further according to the state bit value of Feeder Terminal Unit, completes the selection to faulty line；Then by the detection to each Feeder Terminal Unit state bit value in faulty line, the judgement and selection to fault section are completed；With programming it is simple, easily realize, suitable for isolated neutral and by two kinds of methods of operation of grounding through arc the characteristics of.
Description
Technical field
It is particularly a kind of to be used to small current neutral grounding system occur the present invention relates to Power System Faults Detection technical field
The method that fault section is positioned during single-phase earthing.
Background technology
At present, China 35kV and following power distribution network use the method for operation of neutral non-effective grounding, i.e. neutral point mostly
Mode earth-free or by grounding through arc.For both modes of connection, when singlephase earth fault occurs for system due to
Earth point fault curre is small, and power system regulation can allow system to operate with failure 1 ~ 2h, to improve power supply reliability.But
It is that, because non-faulting phase voltage can rise to line voltage under such a method of operation, longtime running will endanger the dielectric level of circuit, also
It is possible to expand as phase fault, influences safe operation of power system.Therefore, faulty line, and isolated fault area are found as early as possible
Section is fixed a breakdown, significant to power system security stable operation.The route selection skill of singlephase earth fault occurs for power distribution network
Art is always study hotspot, but because Distributing network structure is increasingly sophisticated, the reasons such as current in the fault point is small, and singlephase earth fault is quickly accurate
True route selection problem fails to satisfactorily resolve always, and section positioning difficulty is bigger.
The content of the invention
The technical problem to be solved in the invention is to provide one kind and is directed to small current neutral grounding system, for single-phase connect occurs
The fault section on ground carries out method that is quick, being accurately positioned.
In order to solve the above technical problems, the technical solution used in the present invention is as follows.
The localization method of single-phase grounded malfunction in grounded system of low current section, the localization method are completed based on alignment system
The positioning of singlephase earth fault section, the alignment system includes main website and the Feeder Terminal Unit being arranged on each circuit, main
Stand and communicated between each Feeder Terminal Unit；The localization method specifically includes following steps：
A. when singlephase earth fault occurs for system a certain circuit, alignment system is triggered by residual voltage caused by ground connection
Proceed by the positioning of singlephase earth fault section；
B. each Feeder Terminal Unit detection flows through the zero-sequence current of itself and the phase relation of residual voltage to certainly on circuit
Body mode bit carries out set, and status bit message is transferred into main website；
C. main website is patrolled the status bit message of all Feeder Terminal Units on every circuit in units of every circuit
Volume and computing, select faulty line；
D. main website carries out inspection to the status bit message of each Feeder Terminal Unit on faulty line and selects fault section,
And export.
The localization method of above-mentioned single-phase grounded malfunction in grounded system of low current section, Feeder Terminal Unit is carried out in step B
The specific method of oneself state position position is：If one jiao of the advanced residual voltage of the zero-sequence current for flowing through Feeder Terminal Unit itself
Degree, and the angle is less than 90 degree, then the state position of the Feeder Terminal Unit is " 1 "；Under other situations, the line feed terminals are set
Standby state position is " 0 ".
The localization method of above-mentioned single-phase grounded malfunction in grounded system of low current section, main website carries out logical AND fortune in step C
During calculation, if logical AND result is 1, the circuit is non-fault line；If the circuit that logical AND result is 0 is faulty line.
The localization method of above-mentioned single-phase grounded malfunction in grounded system of low current section, step D specifically include herein below：
D1. when faulty line quantity is 1, each mode bit is as 1 Feeder Terminal Unit using in the faulty line
Benchmark Feeder Terminal Unit, its upstream Feeder Terminal Unit and downstream Feeder Terminal Unit are checked respectively, if removing benchmark
Outside Feeder Terminal Unit, the mode bit of other Feeder Terminal Units is 0, then the mode bit for correcting benchmark Feeder Terminal Unit is
0, illustrate that communication failure occurs for faulty line；If being unsatisfactory for above-mentioned condition, carry out step D3 and determine fault section；
D2. when faulty line quantity is more than 1, faulty line is checked one by one；Using mode bit in faulty line as 0 feeder line
Feeder Terminal Unit on the basis of terminal device, its upstream Feeder Terminal Unit and downstream Feeder Terminal Unit are examined respectively
Look into, if in addition to benchmark Feeder Terminal Unit, the mode bit of other Feeder Terminal Units is 1, then corrects benchmark line feed terminals and set
Standby mode bit is 1, illustrates that communication failure occurs for faulty line；If being unsatisfactory for above-mentioned condition, return to step C；
D3. main website since close to the bus bar side Feeder Terminal Unit to the state of each Feeder Terminal Unit on faulty line
Position information is checked, stops checking when checking the Feeder Terminal Unit that first mode bit is not zero, the line feed terminals
Section between equipment and previous Feeder Terminal Unit is singlephase earth fault section.
It is as follows as a result of above technical scheme, the invention technological progress.
The present invention takes full advantage of small current neutral grounding system and faulty line and non-fault line during singlephase earth fault occurs
The characteristics of with different zero-sequence current mutual relation of electric voltage, the quick and precisely positioning to singlephase earth fault section is completed, had
Have programming is simple, easily realize, suitable for isolated neutral and by two kinds of methods of operation of grounding through arc the characteristics of.This hair
Bright application, the workload manually patrolled is greatly reduced, improve the reliability of Operation of Electric Systems.The present invention is using rejecting
The algorithm of failure first and reject failure second algorithm can automatic identification judge caused by communication failure, and to erroneous judgement result
Automatically corrected, interference free performance and accuracy are higher.
Brief description of the drawings
Fig. 1 is that non-fault line during singlephase earth fault occurs for isolated neutral system and compensated distribution network
The phase diagram of zero-sequence current and residual voltage；
Fig. 2 is the phase that faulty line zero-sequence current and residual voltage during singlephase earth fault occur for isolated neutral system
Position graph of a relation；
Fig. 3 is that faulty line zero-sequence current and zero sequence during singlephase earth fault occur for neutral by arc extinction coil grounding system
The phase diagram of voltage；
Fig. 4 is the zero-sequence network figure of specific embodiment in the present invention；
Fig. 5 is the flow chart of the present invention；
Fig. 6 is step D of the present invention logic chart.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be described in further detail.
In small current neutral grounding system, the direction of circuit is flowed to as current reference positive direction using bus.For neutral point not
Earthed system, when singlephase earth fault occurs for system, the advanced angle of residual voltage one of zero-sequence current of non-fault line, the angle
Less than 90 degree, as shown in Figure 1；The zero-sequence current hysteresis angle of residual voltage one of faulty line, the angle are more than 90 degree, such as Fig. 2
It is shown.For the system of neutral by arc extinction coil grounding, when singlephase earth fault occurs for system, due to the compensation of arc suppression coil
Effect, the advanced angle of residual voltage one of zero-sequence current of faulty line, the angle are more than 90 degree, as shown in Figure 3；Non-fault line
Zero-sequence current and residual voltage the same isolated neutral system of relation.
The localization method of single-phase grounded malfunction in grounded system of low current section provided by the invention, completed based on alignment system
The positioning of singlephase earth fault section, alignment system include main website and the Feeder Terminal Unit that is arranged on each circuit, main website with
Communicated between each Feeder Terminal Unit.The phase that Feeder Terminal Unit in the present invention has residual voltage electric current differentiates work(
Can, and a status information position is included, for storing the information of zero-sequence current voltage phase difference after failure occurs.It is right that main website passes through
Feeder Terminal Unit state bit value on each bar circuit carries out selection of the logic and operation completion to fault section.
In the present embodiment, from neutral by arc extinction coil grounding small current neutral grounding system to the present invention fault section
Localization method is described in detail.Assuming that draw three outlets from system busbar：Outlet I, outlet II and outlet III, such as Fig. 4 institutes
Show.Device distribution on specially each circuit is：It is divided into 11 sections and 12 sections on the circuit of outlet I, 11 sections set feedback between bus
Line terminal equipment FTU11, Feeder Terminal Unit FTU is set between 11 sections and 12 sections12；It is divided into 21 sections, 22 sections on the circuit of outlet II
With 23 sections, 21 sections set Feeder Terminal Unit FTU between bus21, Feeder Terminal Unit is set between 21 sections and 22 sections
FTU22, Feeder Terminal Unit FTU is set between 22 sections and 23 sections23；It is divided into 31 sections, 232 sections and 33 sections on the circuit of outlet III, 31
Feeder Terminal Unit FTU is set between section and bus31, Feeder Terminal Unit FTU is set between 31 sections and 32 sections32, 32 sections and 33
Feeder Terminal Unit FTU is set between section33。
In this example, it is assumed that singlephase earth fault occurs for the 32nd section of circuit of outlet III, fault section is determined
The flow chart of position is as shown in figure 5, specifically include following steps：
A. when singlephase earth fault occurs for system a certain circuit, residual voltage U0 triggerings positioning system caused by ground connection is passed through
System proceeds by the positioning of singlephase earth fault section.
B. each Feeder Terminal Unit detection flows through the zero-sequence current I0 and residual voltage U0 of itself phase relation on circuit
Set is carried out to oneself state position, and status bit message is transferred to main website.
Feeder Terminal Unit carry out oneself state position position specific method be：Using bus flow to circuit as current reference just
Direction, detection flow through the zero-sequence current of each Feeder Terminal Unit and the phase relation of residual voltage；If flow through line feed terminals to set
The standby advanced angle of residual voltage one of zero-sequence current of itself, and the angle is less than 90 degree, then the state of the Feeder Terminal Unit
Position is " 1 "；Under other situations, i.e., zero-sequence current hysteresis residual voltage is more than 90 degree or advanced residual voltage is more than 90 degree,
The state position of the Feeder Terminal Unit is " 0 ".
In the present embodiment, after individual event earth fault occurs, the mode bit of final each Feeder Terminal Unit is as follows：In outlet I
Feeder Terminal Unit FTU11For 1, Feeder Terminal Unit FTU12For 1；Feeder Terminal Unit FTU in outlet II21For 1, feeder line is whole
End equipment FTU22For 1, Feeder Terminal Unit FTU23For 1；Feeder Terminal Unit FTU in outlet III31For 0, Feeder Terminal Unit
FTU32For 0, Feeder Terminal Unit FTU33For 1.
C. main website is according to the status bit message of each Feeder Terminal Unit of reception, in units of every circuit, to every line
The state bit value of all Feeder Terminal Units carries out logic and operation on road, if logical AND result is 1, the circuit is non-event
Hinder circuit；If the circuit that logic and operation result is 0 is faulty line, and records faulty line quantity n.
In the present embodiment, the result of each circuit logic and computing is：Outlet I is 1；Outlet II is 1；Outlet III is 0；So
Faulty line is outlet III, that is, completes small current neutral grounding system to occur the selection of single-phase fault circuit.
D. main website carries out inspection to the status bit message of each Feeder Terminal Unit on faulty line and selects fault section,
And export, the decision logic of fault section using following methods as shown in fig. 6, specifically carried out.
D1. when faulty line quantity n is 1, fault data is rejected using the algorithm of failure second is rejected.Reject failure second
Algorithm is：It is Feeder Terminal Unit on the basis of 1 Feeder Terminal Unit by each mode bit in the faulty line, to its upstream
Feeder Terminal Unit and downstream Feeder Terminal Unit are checked that, if in addition to benchmark Feeder Terminal Unit, other feeder lines are whole respectively
The mode bit of end equipment is 0, then the mode bit for correcting benchmark Feeder Terminal Unit is 0, illustrates that communication event occurs for faulty line
Barrier；If being unsatisfactory for above-mentioned condition, carry out step D3 and determine fault section.
D2. when faulty line quantity n is more than 1, faulty line is checked one by one, and event is rejected using the algorithm of failure first is rejected
Hinder data.It is Feeder Terminal Unit on the basis of 0 Feeder Terminal Unit by mode bit in faulty line, to its upstream line feed terminals
Equipment and downstream Feeder Terminal Unit checked respectively, if in addition to benchmark Feeder Terminal Unit, other Feeder Terminal Units
Mode bit is 1, then the mode bit for correcting benchmark Feeder Terminal Unit is 1, illustrates that communication failure occurs for faulty line；It is if discontented
Sufficient above-mentioned condition, then return to step C, until faulty line quantity n is 1.
D3. main website since close to the bus bar side Feeder Terminal Unit to the state of each Feeder Terminal Unit on faulty line
Position information is checked, stops checking when checking the Feeder Terminal Unit that first mode bit is not zero, the line feed terminals
Section between equipment and previous Feeder Terminal Unit is singlephase earth fault section.
In the present embodiment, faulty line quantity 1, i.e., only outlet III is faulty line, therefore first with rejecting failure the
Two algorithms are fixed a breakdown data.Due to the Feeder Terminal Unit FTU that mode bit is 133In the absence of downstream Feeder Terminal Unit, therefore
Section location algorithm can be used to carry out fault section in faulty line to be positioned.Specific implementation method is：Faulty line is gone out
The status bit message of each Feeder Terminal Unit on line III is checked that first Feeder Terminal Unit being not zero is that feeder line is whole
End equipment FTU33, so fault section is Feeder Terminal Unit FTU33With Feeder Terminal Unit FTU32Between 32 sections, that is, complete
Selection to fault section in faulty line.
Last main website exports fault section result again, i.e., singlephase earth fault occurs for the 32nd section of circuit in outlet III.
The specific embodiment of the present invention is above are only, but is originally not limited thereto, it is all that the present invention is carried out using this design
The change of unsubstantiality, belongs to the scope of protection of the invention.
Claims (3)
1. the localization method of single-phase grounded malfunction in grounded system of low current section, it is characterised in that the localization method is based on fixed
Position system completes the positioning of singlephase earth fault section, and the alignment system includes main website and the feeder line being arranged on each circuit is whole
End equipment, communicated between main website and each Feeder Terminal Unit；The localization method specifically includes following steps：
A. when singlephase earth fault occurs for system a certain circuit, alignment system is triggered by residual voltage caused by ground connection and started
Carry out the positioning of singlephase earth fault section；
B. each Feeder Terminal Unit detection flows through the zero-sequence current of itself and the phase relation of residual voltage to itself shape on circuit
State position carries out set, and status bit message is transferred into main website；
C. main website carries out logical AND in units of every circuit to the status bit message of all Feeder Terminal Units on every circuit
Computing, select faulty line；
D. main website carries out inspection to the status bit message of each Feeder Terminal Unit on faulty line and selects fault section, and defeated
Go out；Step D specifically includes herein below：
D1. when faulty line quantity is 1, on the basis of each mode bit in the faulty line is 1 Feeder Terminal Unit
Feeder Terminal Unit, its upstream Feeder Terminal Unit and downstream Feeder Terminal Unit are checked respectively, if removing benchmark feeder line
Outside terminal device, the mode bit of other Feeder Terminal Units is 0, then the mode bit for correcting benchmark Feeder Terminal Unit is 0, is said
Communication failure occurs for bright faulty line；If being unsatisfactory for above-mentioned condition, carry out step D3 and determine fault section；
D2. when faulty line quantity is more than 1, faulty line is checked one by one；Using mode bit in faulty line as 0 line feed terminals
Feeder Terminal Unit on the basis of equipment, its upstream Feeder Terminal Unit and downstream Feeder Terminal Unit are checked respectively, if
In addition to benchmark Feeder Terminal Unit, the mode bit of other Feeder Terminal Units is 1, then corrects the shape of benchmark Feeder Terminal Unit
State position is 1, illustrates that communication failure occurs for faulty line；If being unsatisfactory for above-mentioned condition, return to step C；
D3. main website is believed the mode bit of each Feeder Terminal Unit on faulty line since close to the bus bar side Feeder Terminal Unit
Breath is checked, stops checking when checking the Feeder Terminal Unit that first mode bit is not zero, the Feeder Terminal Unit
Section between previous Feeder Terminal Unit is singlephase earth fault section.
2. the localization method of single-phase grounded malfunction in grounded system of low current section according to claim 1, it is characterised in that
The specific method of Feeder Terminal Unit progress oneself state position position is in step B：If flow through Feeder Terminal Unit itself
The advanced angle of residual voltage one of zero-sequence current, and the angle is less than 90 degree, then the state position of the Feeder Terminal Unit is
“1”；Under other situations, the state position of the Feeder Terminal Unit is " 0 ".
3. the localization method of single-phase grounded malfunction in grounded system of low current section according to claim 2, it is characterised in that
When main website carries out logic and operation in step C, if logical AND result is 1, the circuit is non-fault line；If logical AND result
Circuit for 0 is faulty line.
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| CN201510563630.4A CN105116290B (en) | 2015-09-08 | 2015-09-08 | The localization method of single-phase grounded malfunction in grounded system of low current section |
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Families Citing this family (6)
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| CN106443292B (en) * | 2016-01-21 | 2019-10-29 | 张家港智电电工高技术研究所有限公司 | A kind of overhead transmission line single-phase earth fault detecting method based on zero sequence current measurement |
| CN107561406A (en) * | 2017-08-16 | 2018-01-09 | 杭州零尔电力科技有限公司 | It is a kind of based on fault line selection method for single-phase-to-ground fault of the multiterminal than width phase comparing method |
| CN108872783B (en) * | 2018-05-24 | 2020-10-09 | 国网浙江省电力有限公司电力科学研究院 | Single-phase earth fault section positioning method of resonance earthing system |
| CN108919056B (en) * | 2018-07-26 | 2020-10-16 | 云南电网有限责任公司电力科学研究院 | Fault phase judging method and device based on group angular difference |
| CN109507532A (en) * | 2018-11-22 | 2019-03-22 | 西安科技大学 | A kind of small current neutral grounding system Feeder Section Location |
| CN110261721B (en) * | 2019-08-06 | 2021-02-02 | 云南电网有限责任公司电力科学研究院 | Single-phase grounding judgment and phase judgment method in active compensation mode |
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