CN108872784A - A kind of fault line selection method for single-phase-to-ground fault based on zero-sequence current dynamic change characterization - Google Patents
A kind of fault line selection method for single-phase-to-ground fault based on zero-sequence current dynamic change characterization Download PDFInfo
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- CN108872784A CN108872784A CN201810527192.XA CN201810527192A CN108872784A CN 108872784 A CN108872784 A CN 108872784A CN 201810527192 A CN201810527192 A CN 201810527192A CN 108872784 A CN108872784 A CN 108872784A
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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
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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
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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Abstract
The present invention relates to non-effective earthing distribution network technologies, more particularly to a kind of fault line selection method for single-phase-to-ground fault based on zero-sequence current dynamic change characterization, overcompensation degree is initially formed as each feeder line zero-sequence current dynamic change sequence under the conditions of p1,0 ,-p2 three, then the degree of correlation between each feeder line zero-sequence current dynamic change sequence is sought using correlation coefficient process, is faulty line with the smallest feeder line of the sum of other feeder line degrees of correlation.The feeder line of singlephase earth fault occurs for reliably determining through grounding through arc power distribution network for the selection method, to overcome the problems, such as to adjust arc suppression coil to improve remnant current increment method earth fault line selection Reliability of Microprocessor.
Description
Technical field
The invention belongs to non-effective earthing distribution network technology field, more particularly to one kind are special based on zero-sequence current dynamic change
The fault line selection method for single-phase-to-ground fault of sign.
Background technique
Existing non-effective earthing wire selection method for power distribution network single phase earthing failure can substantially be divided according to it using the difference of information
For 2 classes：First is that the fault-line selecting method based on additional Injection Signal；Second is that electrical quantity when using singlephase earth fault changes spy
Sign carries out failure line selection, can be divided into failure line selection method based on failure steady-state component again, based on the failure of fault transient component
Route selection method and faulty line selection method.From the point of view of practical experiences, the remnant current increment method wound based on failure steady-state component
The used compensativity of the property made land productivity adjusts this dynamic process and realizes failure line selection, can select under the conditions of the earth-fault current of very little
Be out of order feeder line, and effect of field application is good.Its basic principle is to change the overcompensation of arc suppression coil under singlephase earth fault state
Degree changes arc suppression coil series and parallel compensated resistance, then compares zero-sequence current variable quantity in each feeder line and realizes failure line selection.
However, how to adjust arc suppression coil to further increase the Reliability of Microprocessor of remnant current increment method earth fault line selection
Aspect is not built consensus yet at present.A kind of thinking thinks that, in undercompensation region, remnant current increment method earth fault line selection can not be just
Positive motion is made, and proposes to realize failure line selection by switching system earthing mode；Another thinking thinks, to extract fault feeder and non-event
Hinder zero-sequence current feature difference in feeder line, overcompensation degree should be made to be adjusted to p0 by-p0；Thinking also thinks the tune of overcompensation degree
Section have no it is specifically limited, only need to by arc suppression coil adjust one grade or several grades.
Summary of the invention
The object of the present invention is to provide a kind of can reliably determine, and singlephase earth fault occurs through grounding through arc power distribution network
Feeder line selection method.
To achieve the above object, the technical solution adopted by the present invention is that：It is a kind of based on zero-sequence current dynamic change characterization
Fault line selection method for single-phase-to-ground fault, including be initially formed overcompensation degree and moved for each feeder line zero-sequence current under the conditions of p1,0 ,-p2 three
Then state change sequence seeks the degree of correlation between each feeder line zero-sequence current dynamic change sequence using correlation coefficient process, with it
The smallest feeder line of the sum of his the feeder line degree of correlation is faulty line；Steps are as follows：
Step 1, adjusting arc suppression coil make power distribution network overcompensation degree become 0 from p1, measure each feeder line under overcompensation degree p1
Zero-sequence current measures each feeder line zero-sequence current under overcompensation degree 0；
Step 2, adjusting arc suppression coil make power distribution network overcompensation degree become-p2 from 0, measure each feedback under overcompensation degree-p2
Line zero-sequence current；
Step 3, formation overcompensation degree are p1,0, each feeder line zero-sequence current dynamic change sequence under the conditions of-p2 three；
Step 4 seeks the degree of correlation between each feeder line zero-sequence current dynamic change sequence using correlation coefficient process, with other
The smallest feeder line of the sum of the feeder line degree of correlation is selected faulty line.
In the above-mentioned fault line selection method for single-phase-to-ground fault based on zero-sequence current dynamic change characterization, mistake described in step 3
Compensativity be p1,0, each feeder line zero-sequence current dynamic change sequence is under the conditions of-p2 three：
1) non-fault line i zero-sequence current dynamic change sequencing theory value is：
2) faulty line n zero-sequence current dynamic change sequencing theory value is：
Wherein, EAPotential when mutually being operated normally for failure；For the sum of feeder line direct-to-ground capacitance all on bus；
CiFor feeder line i direct-to-ground capacitance；RfFor fault resistance；ω is power frequency angular frequency.
In the above-mentioned fault line selection method for single-phase-to-ground fault based on zero-sequence current dynamic change characterization, the realization of step 4
Include the following steps：
1. passing through feeder line i zero-sequence current dynamic change sequence SiWith feeder line j zero-sequence current dynamic change sequence SjBetween phase
Guan DuFind out the degree of correlation between each feeder line zero-sequence current dynamic change sequence；
2. passing through the sum of feeder line i and other feeder line degrees of correlationThe sum of find out with other feeder line degrees of correlation
The smallest feeder line is as selected faulty line.
Beneficial effects of the present invention are：The reliability of remnant current increment method single-phase earth fault line selection is improved, it can reliably really
The fixed feeder line that singlephase earth fault occurs through grounding through arc power distribution network.
Detailed description of the invention
Fig. 1 is fault line selection method for single-phase-to-ground fault stream of the one embodiment of the invention based on zero-sequence current dynamic change characterization
Cheng Tu；
Fig. 2 is the typical power distribution network schematic diagram through grounding through arc of one embodiment of the invention.
Specific embodiment
Embodiments of the present invention are described in detail with reference to the accompanying drawing.
Embodiment 1, the present embodiment provides a kind of single-phase earth fault line selection sides based on zero-sequence current dynamic change characterization
Method is deposited for reliably determining the feeder line that singlephase earth fault occurs through grounding through arc power distribution network with overcoming in background technique
The problem of.It is initially formed overcompensation degree for each feeder line zero-sequence current dynamic change sequence under the conditions of p1,0 ,-p2 three, then
The degree of correlation between each feeder line zero-sequence current dynamic change sequence is sought using correlation coefficient process, the sum of with other feeder line degrees of correlation
The smallest feeder line is faulty line.
When it is implemented, as shown in Figure 1, first, adjust arc suppression coil power distribution network overcompensation degree made to become 0 from p1, measurement
Each feeder line zero-sequence current under overcompensation degree p1 measures each feeder line zero-sequence current under overcompensation degree 0.
In grounded distribution system, single-phase (A phase) ground fault occurs for feeder line n.It is formed accordingly based on symmetrical component method
Sequence diagrams, if X0C、X1C、X2CThe respectively capacitance to earth of distribution line zero sequence, positive sequence, negative phase-sequence, ZT1、ZT2Respectively transformer
Positive and negative sequence equivalent impedance, ZS0、ZS1、ZS2Respectively system side zero sequence, positive and negative and negative phase-sequence equivalent impedance, ESFor system side power generation
Machine equivalence potential (only positive-sequence component), L are the inductance value of arc suppression coil, RfIt is grounded transition resistance for fault point,Respectively fault point zero sequence, positive sequence and negative sequence voltage source,Respectively corresponding zero sequence,
Positive and negative and negative-sequence current.Ignore the impedance of distribution line itself, is then by the positive sequence, negative phase-sequence, zero-sequence current of fault point
The characteristics of according to resonance grounding distribution system, Z0>>Z1, Z0>>Z2, therefore formula (1) can be reduced to
Defining overcompensation degree p is：
The zero-sequence current expression formula of non-fault line i and faulty line n can be obtained respectively as shown in formula (4) and formula (5).
The zero-sequence current expression formula of non-fault line i and faulty line n can be obtained respectively as shown in formula (4) and formula (5).
At overcompensation degree p1, the zero-sequence current of non-fault line i and faulty line n are respectively shown in following (6) and (7).
Under overcompensation degree 0, the zero-sequence current of non-fault line i and faulty line n are respectively shown in following (8) and (9).
Second, adjusting arc suppression coil makes power distribution network overcompensation degree become-p2 from 0, measures each feeder line under overcompensation degree-p2
Zero-sequence current.
At overcompensation degree-p2, following (10) and (11) institute of zero-sequence current difference of non-fault line i and faulty line n
Show.
Third forms overcompensation degree as each feeder line zero-sequence current dynamic change sequence under the conditions of p1,0 ,-p2 three.
Zero-sequence current according to above-mentioned solution, for non-fault line i, under the conditions of overcompensation degree p1,0 ,-p2 three
Dynamic change sequence is：
For faulty line n, zero-sequence current dynamic change sequence under the conditions of overcompensation degree p1,0 ,-p2 three is：
4th, the degree of correlation between each feeder line zero-sequence current dynamic change sequence is sought using correlation coefficient process, with other
The smallest feeder line of the sum of the feeder line degree of correlation is faulty line.
I feeder line zero-sequence current dynamic change sequence S is sought using following formula (12)iBecome with j feeder line zero-sequence current dynamic
Change sequence SjBetween the degree of correlation：
The sum of feeder line i and other feeder line degrees of correlation are found out using following formula (13)：
Each feed line value the sum of related to other feeder lines is ranked up, with the smallest feedback of the sum of other feeder line degrees of correlation
Line can be identified as faulty line.
Embodiment 2, certain typical power distribution network through grounding through arc are as shown in Fig. 2, the model is the distribution of a 10kV
Net feeder system, feeder line are made of overhead line and cable, and outlet shares 6, and wherein route 1 is overhead line-cable mixed connection line
Road is made of 20km overhead transmission line and 10km cable；Route 2, route 3 and route 4 are cable run, remaining is overhead transmission line.
(1) overhead transmission line parameter：r0=0.23 Ω/km, r1=0.096 Ω/km；l0=3.66mH/km, l1=1.22mH/km；c0=
0.007 μ F/km, c1=0.011 μ F/km.(2) cable-line parameter：r0=0.34 Ω/km, r1=0.11 Ω/km；l0=
1.54mH/km l1=0.52mH/km；c0=0.19 μ F/km, c1=0.29 μ F/km.
Assuming that feeder line 5 has occurred through transition resistance RfThe singlephase earth fault of=1000 Ω, then to determine faulty line,
Including detailed process as described below：
Step 1, adjusting arc suppression coil makes power distribution network overcompensation degree become 0 from p1, measures each feeder line under overcompensation degree p1
Zero-sequence current measures each feeder line zero-sequence current under overcompensation degree 0.
Step 2, adjusting arc suppression coil makes power distribution network overcompensation degree become-p1 from 0, measures each feedback under overcompensation degree-p1
Line zero-sequence current.
3rd Walk forms overcompensation degree as each feeder line zero-sequence current dynamic change sequence under the conditions of p1,0 ,-p1 three.
It can thus be concluded that the zero-sequence current dynamic change sequence of 6 feeder lines is respectively out：
S1=[2.90,3.71,2.52]
S2=[0.80,1.02,0.69]
S3=[2.66,3.41,2.33]
S4=[8.04,10.30,7.00]
S5=[1.31,0.10,1.41]
S6=[0.15,0.18,0.13]
4th Walk seeks the degree of correlation between each feeder line zero-sequence current dynamic change sequence using correlation coefficient process, with other
The smallest feeder line of the sum of the feeder line degree of correlation is faulty line.
RS1,S2=1.00
RS1,S3=1.00
RS1,S4=1.00
RS1,S5=0.75
RS1,S6=1.00
RS2,S3=1.00
RS2,S4=1.00
RS2,S5=0.75
RS2,S6=1.00
RS3,S4=1.00
RS3,S5=0.75
RS3,S6=1.00
RS4,S5=0.75
RS4,S6=1.00
RS5,S6=0.77
Find out the sum of each feeder line i and other feeder line degrees of correlation：
R∑1=4.75
R∑2=4.75
R∑3=4.75
R∑4=4.75
R∑5=3.77
R∑6=4.77
Find out the minimum value with the sum of other feeder line degrees of correlation, as R∑5, therefore, it is judged as that feeder line 5 is fault feeder.
It should be understood that the part that this specification does not elaborate belongs to the prior art.
Although being described in conjunction with the accompanying a specific embodiment of the invention above, those of ordinary skill in the art should
Understand, these are merely examples, various deformation or modification can be made to these embodiments, without departing from original of the invention
Reason and essence.The scope of the present invention is only limited by the claims that follow.
Claims (3)
1. a kind of fault line selection method for single-phase-to-ground fault based on zero-sequence current dynamic change characterization, characterized in that including shape first
It is p1,0, each feeder line zero-sequence current dynamic change sequence under the conditions of-p2 three at overcompensation degree, is then asked using correlation coefficient process
The degree of correlation between each feeder line zero-sequence current dynamic change sequence is taken, is event with the smallest feeder line of the sum of other feeder line degrees of correlation
Hinder route；Steps are as follows：
Step 1, adjusting arc suppression coil make power distribution network overcompensation degree become 0 from p1, measure each feeder line zero sequence under overcompensation degree p1
Electric current measures each feeder line zero-sequence current under overcompensation degree 0；
Step 2, adjusting arc suppression coil make power distribution network overcompensation degree become-p2 from 0, measure each feeder line zero under overcompensation degree-p2
Sequence electric current；
Step 3, formation overcompensation degree are p1,0, each feeder line zero-sequence current dynamic change sequence under the conditions of-p2 three；
Step 4 seeks the degree of correlation between each feeder line zero-sequence current dynamic change sequence using correlation coefficient process, with other feeder lines
The smallest feeder line of the sum of degree of correlation is selected faulty line.
2. the fault line selection method for single-phase-to-ground fault as described in claim 1 based on zero-sequence current dynamic change characterization, feature
Be, overcompensation degree described in step 3 be p1,0, each feeder line zero-sequence current dynamic change sequence is under the conditions of-p2 three：
1) non-fault line i zero-sequence current dynamic change sequencing theory value is：
2) faulty line n zero-sequence current dynamic change sequencing theory value is：
Wherein, EAPotential when mutually being operated normally for failure；For the sum of feeder line direct-to-ground capacitance all on bus；CiFor
Feeder line i direct-to-ground capacitance；RfFor fault resistance；ω is power frequency angular frequency.
3. the fault line selection method for single-phase-to-ground fault as described in claim 1 based on zero-sequence current dynamic change characterization, feature
It is that the realization of step 4 includes the following steps：
1. passing through feeder line i zero-sequence current dynamic change sequence SiWith feeder line j zero-sequence current dynamic change sequence SjBetween the degree of correlationFind out the degree of correlation between each feeder line zero-sequence current dynamic change sequence；
2. passing through the sum of feeder line i and other feeder line degrees of correlationIt finds out the smallest with the sum of other feeder line degrees of correlation
Feeder line is as selected faulty line.
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| CN113949319A (en) * | 2021-09-23 | 2022-01-18 | 华中科技大学 | Generator stator single-phase earth fault arc extinction method and system |
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| CN113949319A (en) * | 2021-09-23 | 2022-01-18 | 华中科技大学 | Generator stator single-phase earth fault arc extinction method and system |
| CN113949319B (en) * | 2021-09-23 | 2023-11-14 | 华中科技大学 | Single-phase earth fault arc extinction method and system for generator stator |
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