CN100463327C - High voltage circuit phase selection based on pallern identification - Google Patents
High voltage circuit phase selection based on pallern identification Download PDFInfo
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- CN100463327C CN100463327C CNB031144128A CN03114412A CN100463327C CN 100463327 C CN100463327 C CN 100463327C CN B031144128 A CNB031144128 A CN B031144128A CN 03114412 A CN03114412 A CN 03114412A CN 100463327 C CN100463327 C CN 100463327C
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Abstract
This invention discloses a method for selecting the phase of the high voltage power lines on the basis of the model distinguishing and is used for the phase selecting components during oscillation blocking. It is characterized in that the model distinguishing method is adopted to calculate respectively the distances and the three orders voltages at the failure sites under two failure models, which are the models of the single phase grounding and the double phases short circuiting grounding when a grounding failure occurs, determining the actual phases on which the failure occurs through judging whether or not the three orders voltage meet the boundary conditions under the corresponding failure.
Description
One, affiliated technical field
The present invention relates to the power system high tension power line protection, particularly a kind of high-tension line phase-selecting method based on Model Identification.
Two, background technology
At present in the domestic digital high-voltage line protection main adopt the choosing of sudden change amount mutually and the steady-state quantity choosing combine mutually, starting back choosing for the first time in protection is to adopt phase current difference sudden change amount to select phase mutually, owing to it is not subjected to the influence of load current, the very high phase precision of selecting is arranged; Phase selection element during the out-of-step blocking, owing to sudden change amount extraction difficulty adopts steady-state quantity to select phase, ordinary circumstance adopts the subregion combined impedance comparative approach of preface electric current to constitute.
Earth fault adopts relative phase zero, negative sequence component to concern that combined impedance selects phase in the choosing mutually of preface component, and earth-free fault adopts impedance to select phase.The choosing of preface component confirms according to negative phase-sequence under the different faults situation and zero-sequence current relative phase that mutually the division of phase region is as figure A.
By
Relation between relative phase and the fault type sees the above table; in the table; (2), (4), (6) are the separate phase region of single failure; directly confirm as corresponding phase-to phase fault; in (1), (3), (5) phase region comprises single-phase and alternate two kinds of fault types; because two kinds of fault types is separate always incoherent; adopt alternate impedance exclusive method; if promptly protector measuring to alternate resistance value in the alternate impedance ranges of adjusting; then confirm as is phase-to phase fault; otherwise, confirm as corresponding single phase ground fault.The reason that adopts alternate impedance exclusive method is to think that alternate impedance component is for phase to phase fault total energy precision maneuver.
At present, utilize the subregion of preface electric current and measure impedance ratio method, as (the list of references: Xu Zhenyu of the phase selection element during the out-of-step blocking; Yang Qixun; Liu Wanshun etc. a kind of preface component high-voltage line protection phase selection element. Proceedings of the CSEE, 1997,17 (3): 214~216).During the out-of-step blocking; measuring impedance (being non-fault phase especially) is subjected to the influence of system oscillation very big; the measurement impedance ratio can be falsely dropped single-phase earthing than this auxiliary element and be line to line fault earth fault; also the erroneous judgement of line to line fault ground connection can be single-phase earthing; the ability of its anti-transition resistance is also very poor, and this is the big hidden danger in the current ultra-high-tension power transmission line protection.
Three, summary of the invention
The objective of the invention is to, a kind of high-tension line phase-selecting method based on Model Identification is provided.
The technical scheme that realizes the high-tension line phase-selecting method of purpose Model Identification of the present invention is such: to single-phase earthing and two kinds of models of line to line fault ground connection take place, calculate distance and fault point three sequence voltages under these two kinds of fault models respectively, whether satisfy boundary condition under the corresponding failure by differentiating three sequence voltages, determine that with this physical fault is separate.May further comprise the steps:
1) known quantity is set
(1) measures three sequence voltages of protecting the installation place in real time
And electric current
Electric current flows to line direction for just with bus;
The reaction component X of the single phase impedance that (2) measures in real time
A, X
H, X
CThe reaction component X of the alternate impedance that protection measures in real time
BC, X
CA, X
AH
(3) positive sequence and the zero sequence impedance of establishing the circuit unit length is respectively z
1And z
0, the positive sequence and the zero sequence reactance of circuit unit length are respectively x
1And x
0
(4)
With
Be respectively fault point positive and negative and zero-sequence current over the ground;
2) the fault point three sequence voltage amounts of using in the Model Identification
(1) line to line fault ground connection model
Suppose that alternate earth fault takes place transmission line.Then Jia Ding alternate earth fault place three sequence voltages are respectively:
Wherein: x
IjExpression i, j two-phase phase measurements reactance value;
(2) single-phase earthing model
Suppose transmission line generation single phase ground fault.Then Jia Ding single phase ground fault point place three sequence voltages are respectively:
Wherein: X
iThe measurement reactance value of expression i phase;
(3) situation of two-phase phase fault
Make X
n=min{X
BC, X
CA, X
AB, X
d=mid{X
BC, X
CA, X
AB, X
x=max{X
BC, X
CA, X
AB}
DN:min{X
BC, X
CA, X
ABTwo corresponding fault phases;
DD:mid{X
BC, X
CA, X
ABTwo corresponding fault phases;
DX:max{X
BC, X
CA, X
ABTwo corresponding fault phases;
3) analyze judgement
(1) single-phase earthing:
(2) line to line fault ground connection:
No matter whether pass through transition resistance, have in the fault point this moment
Consider the nargin scope, thereby obtain such conclusion:
With
(3) two-phase phase fault:
Fault point positive-negative sequence voltage magnitude and phase place all equate; Consider nargin scope ε
1=0.5, ε
2=50 °, thus such conclusion obtained:
DN:min{X
BC, X
CA, X
ABTwo corresponding fault phases, | (U
1min-U
2min)/U
2min|<ε
1With
DD:mid{X
BC, X
CA, X
ABTwo corresponding fault phases, | (U
1mid-U
2mid)/U
2mid|<ε
1With
DX:max{X
BC, X
CA, X
ABTwo corresponding fault phases, | (U
1max-U
2max)/U
2max|<ε
1With
The high-tension line phase-selecting method of Model Identification of the present invention has solved the falsely drop phase problem of phase selection element under the power system oscillation situation in the past, has the ability of anti-high resistant, and is not subjected to the influence of braning factor and system operation mode fully.
Four, description of drawings
Figure A is the division figure of negative phase-sequence and zero-sequence current relative phase phase region;
Fig. 1 is single-phase earthing and line to line fault ground connection preface net figure;
Fig. 2 is the flow chart of this phase-selecting method, and wherein Fig. 2 is the main program of flow chart a), Fig. 2 b) be a subprogram (branch 1) of flow chart; Fig. 2 b) is another subprogram (branch 2) of flow chart;
Three sequence voltages at place, fault point when Fig. 4 is earth fault.Wherein (a) and (b) are single-phase earthing, (c), (d) be line to line fault ground connection; (a), (c) expression for protection installation side electrical source voltage, fault point voltage does not change direction, (b), (d) expression fault point voltage generation break-in.
Five, embodiment
For a more clear understanding of the present invention, the present invention is described in further detail below in conjunction with accompanying drawing.
According to technical scheme of the present invention,, can see in conjunction with Fig. 1:
(1) single-phase earthing: single-phase earthing has
Again
Obtain
Thereby such conclusion is arranged:
With
(2) line to line fault ground connection: no matter whether pass through transition resistance, have in the fault point this moment
Give certain nargin, thereby obtain such conclusion:
With
(3) two-phase phase fault: fault point positive-negative sequence voltage magnitude and phase place all equate with (2) similar conclusion is arranged.
Referring to accompanying drawing 2, ε in this flow chart
1=0.5, ε
2=50 °, s=-0.5+j0.866, s
2=-0.5-j0.866,
m
1=0.1~0.15, m
2=0.15~0.2; In the flow chart, voltage, current sequence components are that benchmark obtains with A mutually all.
(1) I
0/ I
1<m
1Illustrate that the zero-sequence current in the circuit is very little, earth fault does not take place.Zero-sequence current should not be zero when earth fault not taking place in theory, and the zero sequence unsymmetrical current when normally moving for the system of escaping in the circuit is given certain nargin scope.Same I
2/ I
1<m
2, illustrating that negative-sequence current is very little in the circuit, unbalanced fault does not take place in transmission line.
(2) if after the fault initiating element starts, satisfy top two conditions simultaneously, and system do not vibrate, then illustrative system generation three-phase shortcircuit; If system vibrates, then three-phase shortcircuit may take place in circuit, perhaps, other type fault and fault point takes place near oscillation center on the circuit, and the phase angle difference of circuit both sides equivalent source is near 180 degree simultaneously.
(3) at I
2, I
0All under the situation greater than threshold value, asymmetric earth fault has taken place in illustrative system.Can basis
With
Relative phase be divided into three districts of A, B, C (see figure 3): the A district comprises AG and two kinds of faults of BCG, and the B district comprises BG and two kinds of faults of CAG, and the C district comprises CG and two kinds of faults of ABG.
(4) the following describes, is the detailed process that example explanation is utilized pattern recognition difference single-phase earthing and two phase ground short circuit with AG, BCG.The phase angle of Arg (z) the vectorial z of expression on the X-Y coordinate plane.
(5) among Fig. 4 (a)~Fig. 4 (d), (a) and (b) are single phase ground fault, (c), (d) be the two-phase phase fault; (a), (c) expression for protection installation side electrical source voltage, the fault point positive sequence voltage does not change direction, (b), (d) expression fault point positive sequence voltage swings to.
(6) in the flow chart, have the positive-negative sequence voltage relative phase relation of protection installation place to determine two groups earlier: first group: (a), (d), second group: (b), (c); The former is opposite at protection installation place positive-negative sequence voltage direction, and the latter in the same way.Certainly; the situation of the positive-negative sequence voltage reversal of installation place also might appear protecting in Fig. 4 (b); as long as figure median generatrix M is moved right; but in this case; position with line to line fault earth fault voltage border condition flag is positioned at protection in the other direction; direction component is judged as in the other direction and breaks down, thereby can get rid of the generation of this kind phenomenon.Fig. 4 (d) also has similar situation.Utilize the positive-negative sequence voltage relative phase relation of protection installation place, be mainly used to the refinement flow process, make the scope of protection deferred action dwindle, that improves phase selection element selects the phase real-time.
(7) the following explanation with first group selected phase scheme (the second prescription case is similar), if X
BC<X
A, use the two phase ground model, among Fig. 4 (a), on the whole circuit between protection installation place and the single-phase earthing point, positive-negative sequence voltage
Between oppositely, simultaneously
With
Between amplitude differ greatlyyer; And among Fig. 4 (d),
Be the positive-negative sequence voltage at double earthfault point place fully, no matter whether transition resistance is arranged,
With
Between phase place and amplitude basic identical.Thereby can judge single-phase earthing and line to line fault ground connection.If X
A<X
BC, use the single-phase earthing model earlier, use X
AThe single phase ground fault point voltage that substitution obtains supposing is not if satisfy single phase ground fault point boundary condition
With
Illustrate that BCG takes place circuit; If satisfy the single-phase earthing model, use line to line fault ground connection model again, use X
BCSubstitution, after the substitution if do not satisfy line to line fault ground connection model, because front X
ASatisfy the single-phase earthing model after the substitution, so must be AG, if also satisfy the two phase ground model, phase is selected in time-delay so.Because it is less to satisfy single-phase and likelihood ratio line to line fault ground connection simultaneously, and vibration is when taking place in system, and the reactance value of non-fault phase (or alternate) is in continuous variation, just through always having a meeting not satisfy the boundary condition of own model correspondence after the time-delay.
(8) in the ordinary course of things, when phase fault (is example with BC) takes place, X under most of situation
BC<X
CA, X
BC<X
ABSo first uses X in the flow process
n=min{X
BC, X
CA, X
ABBe confirmed to be any two-phase generation phase fault; When circuit vibrates, the both sides phase angle difference is near 180 degree, and oscillation center and phase to phase fault point compare, and oscillation center has X during more near protective device
BCX
CAAnd X
BCX
ABSo, in flow chart, next use X
x=max{X
BC, X
CA, X
ABConfirm.
(9) in the FB(flow block) in the flow process in B district, C district, as long as multiply by corresponding angular transition factor s or s respectively with positive and negative sequence voltage vector
2Get final product.
The phase performance of selecting of new element has been passed through the power system digital simulation experiment, selects the phase result accurately and reliably, and the applicant will be used for digital computer line protective device very soon.
Adopt high-tension line phase-selecting method of the present invention, making new phase selection element avoid using is subjected to the far-reaching measurement impedance ratio of system oscillation to select the phase auxiliary element than this, solved the falsely drop phase problem of phase selection element under the power system oscillation situation in the past, simultaneously, this phase selection element has the ability of anti-high resistant, and is not subjected to the influence of braning factor and system operation mode fully.
Claims (1)
1. high-tension line phase-selecting method based on Model Identification, it is characterized in that, to single-phase earthing and two kinds of models of line to line fault ground connection take place, calculate distance and fault point three sequence voltages under these two kinds of fault models respectively, whether satisfy boundary condition under the corresponding failure by differentiating three sequence voltages, determine that physical fault is separate; May further comprise the steps:
1) known quantity is set
(1) measures three sequence voltages of protecting the installation place in real time
And electric current
, electric current flows to line direction for just with bus;
The reaction component X of the single phase impedance that (2) measures in real time
A, X
B, X
C, the reaction component X of the alternate impedance that protection measures in real time
BC, X
CA, X
AB
(3) positive sequence and the zero sequence impedance of establishing the circuit unit length is respectively z
1And z
0, the positive sequence and the zero sequence reactance of circuit unit length are respectively x
1And x
0
(4)
,
With
Be respectively fault point positive and negative and zero-sequence current over the ground;
2) the fault point three sequence voltage amounts of using in the Model Identification
(1) line to line fault ground connection model
Suppose that alternate earth fault takes place transmission line, then Jia Ding alternate earth fault place three sequence voltages are respectively:
Wherein: X
IjExpression i, j two-phase phase measurements reactance value;
(2) single-phase earthing model
Suppose transmission line generation single phase ground fault, then Jia Ding single phase ground fault point place three sequence voltages are respectively:
Wherein: X
iThe measurement reactance value of expression i phase;
(3) situation of two-phase phase fault
Make X
n=min{X
BC, X
CA, X
AB, X
d=mid{X
BC, X
CA, X
AB, X
x=max{X
BC, X
CA, X
AB}
、
、
、
、
、
、
DN:min{X
BC, X
CA, X
ABTwo corresponding fault phases;
DD:mid{X
BC, X
CA, X
ABTwo corresponding fault phases;
DX:max{X
BC, X
CA, X
ABTwo corresponding fault phases;
3) analyze judgement
(1) single-phase earthing:
(2) line to line fault ground connection:
No matter whether pass through transition resistance, have in the fault point this moment
Consider the nargin scope, thereby obtain such conclusion:
With
(3) two-phase phase fault:
Fault point positive-negative sequence voltage magnitude and phase place all equate; Consider nargin scope ε
1=0.5, ε
2=50 °, thus such conclusion obtained:
DN:min{X
BC, X
CA, X
ABTwo corresponding fault phases, | (U
1min-U
2min)/U
2min|<ε
1With
DD:mid{X
BC, X
CA, X
ABTwo corresponding fault phases, | (U
1mid-U
2mid)/U
2mid|<ε
1With
DX:max{X
BC, X
CA, X
ABTwo corresponding fault phases, | (U
1max-U
2max)/U
2max|<ε
1With
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CNB031144128A CN100463327C (en) | 2003-01-09 | 2003-01-09 | High voltage circuit phase selection based on pallern identification |
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CN100463327C true CN100463327C (en) | 2009-02-18 |
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Families Citing this family (7)
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CN100353635C (en) * | 2004-07-21 | 2007-12-05 | 烟台东方电子信息产业股份有限公司 | Faulty phase selection element for transmission line of electric system |
CN1948980B (en) * | 2006-11-04 | 2010-05-12 | 杨运富 | Remote short circuit multi-phase detecting method and detecting device thereof |
CN103176106B (en) * | 2013-03-01 | 2014-12-24 | 江苏镇安电力设备有限公司 | Neutral conductor matching IT (information technology) system single-phase earth fault phase selection method |
CN107024637A (en) * | 2016-01-29 | 2017-08-08 | 中国电力科学研究院 | A kind of double-circuit line on same pole phase-selecting method based on single loop line information |
CN105762774B (en) * | 2016-03-29 | 2018-09-25 | 国网福建省电力有限公司 | Line-to-ground fault phase-selecting method is realized using sequence current phase characteristic and sequence voltage phase characteristic |
CN105759170B (en) * | 2016-03-29 | 2019-02-22 | 国网福建省电力有限公司 | The transmission lines earth fault phase-selecting method that anti-transition resistance influences |
CN109884471B (en) * | 2019-03-22 | 2020-12-11 | 张安斌 | Phasor product active method for judging fault phase and selecting line |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1153414A (en) * | 1996-02-16 | 1997-07-02 | 骆德昌 | Variable value protection method and device for high-voltage transmission line |
JP2000050488A (en) * | 1998-07-28 | 2000-02-18 | Kansai Tech Corp | Method for discrimination cause of ground failure of high-voltage power distribution line |
CN1356752A (en) * | 2001-12-28 | 2002-07-03 | 清华大学 | Digital travelling wave protection method for power transmission line and its relay and protection system |
-
2003
- 2003-01-09 CN CNB031144128A patent/CN100463327C/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1153414A (en) * | 1996-02-16 | 1997-07-02 | 骆德昌 | Variable value protection method and device for high-voltage transmission line |
JP2000050488A (en) * | 1998-07-28 | 2000-02-18 | Kansai Tech Corp | Method for discrimination cause of ground failure of high-voltage power distribution line |
CN1356752A (en) * | 2001-12-28 | 2002-07-03 | 清华大学 | Digital travelling wave protection method for power transmission line and its relay and protection system |
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