CN101593964B - Method for longitudinal zero-sequence power direction protection of double circuit line on same pole - Google Patents
Method for longitudinal zero-sequence power direction protection of double circuit line on same pole Download PDFInfo
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- CN101593964B CN101593964B CN2009100653331A CN200910065333A CN101593964B CN 101593964 B CN101593964 B CN 101593964B CN 2009100653331 A CN2009100653331 A CN 2009100653331A CN 200910065333 A CN200910065333 A CN 200910065333A CN 101593964 B CN101593964 B CN 101593964B
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Abstract
The present invention discloses a method for longitudinal zero-sequence power direction protection of a double circuit line on a same pole, which comprises an own-side zero-sequence power direction criterion and an opposite-side zero-sequence power direction criterion, and the own-side zero-sequence power direction criterion is shown by a formula (I) while the opposite-side zero-sequence power direction criterion is shown by a formula (II), wherein 3I0M and 3I0N are zero-sequence currents of an M side and an N side of one loop, 3I0M' and 3I0N' are the zero-sequence currents of an M side and an N side of the other loop, 3UM0 and 3UN0 are bus zero-sequence voltages of an M side and an N side at a protective mounting part, Arg shows a subsequent phasor phase-taking angle, and K is a zero-sequence mutual inductance influence coefficient. By using the AND gate outputs of the two criterions, when the two formulae are satisfied at the same time, ground faults can be determined to appear in a protected area, and the criterions of the longitudinal zero-sequence power direction protection are acted.
Description
Technical field
The invention belongs to electricity field, be specifically related to a kind of method for longitudinal zero-sequence power direction protection of suitable double-circuit lines on the same pole.
Background technology
Double-circuit lines on the same pole because have that electric outgoing line corridor is narrow, transmission capacity is big, small investment, instant effect, can improve advantages such as power supply reliability, operation maintenance are simple, requirement such as can adapt to well that modern power systems is reliable, economy, transmission line capability are big has obtained using widely at present.Electrical link is not only arranged between double-circuit lines on the same pole; also there is the magnetic contact; exist bigger zero-sequence mutual inductance influence between the double-circuit lines on the same pole circuit; when a loop line wherein breaks down; also there is fault current to flow through in another loop line; the electric current and voltage of two loop lines interacts by mutual inductance; make residual voltage on the bus not only depend on the electric current of this line; also be subjected to the influence of another loop line electric current; this makes the protection problem of double-circuit lines on the same pole become complicated, the guard method that can not apply mechanically single back transmission line simply.
Because the influence of double loop zero-sequence mutual inductance can be flow through zero-sequence current in another loop line, the bus zero sequence residual voltage of protection installation place depended on the zero-sequence current in two loop lines when double-circuit line on same pole took place by the asymmetric ground connection of single loop line; When cross-line earth fault takes place, zero-sequence current is all arranged in two loop lines, the size and Orientation of zero-sequence current not only depends on fault type and system's zero-sequence impedance parameter, and is subjected to the influence of zero-sequence mutual inductance between two loop lines, the inconsistent phenomenon of zero-sequence current direction with single line down also might occur.The protection of vertical connection zero sequence direction is the most extensive and effectively one of the protection fast of present domestic use, plays an important role when faults such as developing fault, high resistance ground.Up to the present; the zero sequence power direction protection criterion of traditional double-circuit lines on the same pole is that the zero sequence power direction protection that will be used for single loop line is applied directly to double loop; and double loop is not done as a whole the configuration; when fault takes place; mutual inductance meeting between double loop causes electric current and voltage interaction between double loop; might cause the erroneous judgement or the tripping of zero sequence power direction protection criterion, zero sequence power direction protection criterion loses directivity.
Summary of the invention
At the deficiencies in the prior art, the technical problem to be solved in the present invention proposes a kind of method for longitudinal zero-sequence power direction protection of double-circuit lines on the same pole, to be applicable to the zero sequence power direction protection on double-circuit lines on the same pole road.
For solving the problems of the technologies described above, the present invention has adopted a kind of method for longitudinal zero-sequence power direction protection of double-circuit lines on the same pole, and this method comprises the steps:
(a) this side zero sequence power direction criterion part and offside zero sequence power direction criterion are set
This side zero sequence power direction criterion is:
In the formula, 3I
0MBe this loop line M side zero-sequence current,
Be another loop line M side zero-sequence current, 3U
M0Be the bus residual voltage of protection installation place M side, Arg represent to the back measure phase angle mutually, K is the zero-sequence mutual inductance influence coefficient;
Offside zero sequence power direction criterion is:
In the formula, 3I
0NBe this loop line N side zero-sequence current,
Be another loop line N side zero-sequence current, 3U
N0Be the bus residual voltage of protection installation place N side, Arg represent to the back measure phase angle mutually, K is the zero-sequence mutual inductance influence coefficient, zero-sequence mutual inductance influence coefficient value is
In the formula, Z
0Be the zero sequence impedance of circuit, Z
MBe mutual impedance between the double loop line;
(b) decision making according to criterion
When satisfying (1) formula with (2) formula simultaneously, promptly in the decidable protection zone earth fault has appearred, the action of zero sequence power direction protection criterion; If only satisfy (1) formula or only satisfy (2) formula, then be judged to another loop line earth fault or external area error, the protection criterion is failure to actuate.
The zero-sequence mutual inductance influence coefficient value of the method for longitudinal zero-sequence power direction protection that is applicable to double-circuit lines on the same pole that the present invention proposes is
In the formula, Z
0Be the zero sequence impedance of circuit, Z
MBe mutual impedance between the double loop line.
Compare with the method for longitudinal zero-sequence power direction protection of existing parallel lines on same tower double back transmission line, longitudinal zero-sequence power direction protection criterion of the present invention has following characteristics:
1, longitudinal zero-sequence power direction protection criterion of the present invention disposes double loop with an integral body; optical fiber communication by communication and circuit two ends electric parameters between line; the zero-sequence current of zero-sequence current, residual voltage and another loop line of protection circuit offside is introduced in the protective device; carry out the differentiation of double loop internal fault and external fault, thereby improved the accuracy that the longitudinal zero-sequence power direction protection criterion is differentiated.
2, longitudinal zero-sequence power direction protection criterion of the present invention has been considered the influence of the zero-sequence mutual inductance between double loop; introduced the zero-sequence current of another loop line; improved the accuracy that longitudinal zero-sequence power direction protection criterion when cross line fault occurring between double loop is judged, and the double-circuit line on same pole longitudinal zero-sequence power direction protection criterion of present employing single back line longitudinal zero-sequence power direction protection criterion is judged easily when different name phase cross-line earth fault occurring between double loop by accident.
3, the longitudinal zero-sequence power direction protection criterion of the present invention internal and external fault of identification protecting circuit correctly can also correctly be discerned simultaneously which line down of double-circuit line.
Description of drawings
System schematic when Fig. 1 is applied to normally move double loop inside I line-to-ground fault for longitudinal zero-sequence power direction protection criterion of the present invention;
System schematic when Fig. 2 is applied to normally move the inner IBIIC of generation of double loop cross-line earth fault for longitudinal zero-sequence power direction protection criterion of the present invention.
Embodiment
Among Fig. 1, when the inner I loop line of double-circuit lines on the same pole generation single phase ground fault, this moment, M side bus residual voltage was
In the formula:
Be M side bus residual voltage,
Be the M side zero-sequence current of circuit I,
Be earth point residual voltage, Z
0Be the circuit zero sequence impedance, α is that the short dot distance accounts for the ratio of length completely; N side bus residual voltage is
The zero-sequence current that II loop line both sides are flow through is
Therefore, for the loop line I, consider that the zero sequence impedance angle of the longitudinal zero-sequence power direction protection criterion of zero sequence mutual impedance influence between loop line II line is
The longitudinal zero-sequence power direction protection criterion at 1,2 places action in the loop line I.For the loop line II, consider that the zero sequence impedance angle of the longitudinal zero-sequence power direction protection criterion of zero sequence mutual impedance influence between loop line I line is
(when nearly M side generation earth fault)
Because the criterion of the longitudinal zero-sequence power direction protection criterion of loop line II can not satisfy simultaneously, the longitudinal zero-sequence power direction protection criterion at 3,4 places is failure to actuate in the loop line II.
Among Fig. 2, when the inner generation of double loop IBIIC cross-line earth fault, the algebraical sum of the residual voltage that the bus residual voltage of M side and N side produces when being IB generation single-phase earthing and IIC generation single phase ground fault.The bus residual voltage that IB produces when single-phase earthing takes place is respectively
The zero-sequence current that flows through in II loop line both sides is
The bus residual voltage that IIC produces when single phase ground fault takes place is respectively
The zero-sequence current that flows through in I loop line both sides is
Therefore, when the inner generation of double loop IBIIC cross-line earth fault, M side bus residual voltage is
In the formula,
Be the total residual voltage phasor in fault point.The zero-sequence current that 1 effluent is crossed in the I loop line is
The zero-sequence current that 2 effluents are crossed in the I loop line is
The zero-sequence current that 3 effluents are crossed in the II loop line is
The zero-sequence current that 4 effluents are crossed in the II loop line is
The bus residual voltage of M and N side is represented with the actual measurement zero-sequence current of circuit, after deriving, can be got
Can be got by above four formulas, the bus residual voltage of M and N side falls
And the bus residual voltage of M and N side falls also and can be expressed as
So the bus residual voltage of M and N side can be expressed as
Therefore, for the loop line I, consider that the zero sequence impedance angle of the longitudinal zero-sequence power direction protection criterion of zero sequence mutual impedance influence between loop line II line is
The longitudinal zero-sequence power direction protection criterion at 1,2 places action in the loop line I;
For the loop line II, consider that the zero sequence impedance angle of the longitudinal zero-sequence power direction protection criterion of zero sequence mutual impedance influence between loop line I line be (when near M side generation earth fault)
Because the criterion of the longitudinal zero-sequence power direction protection criterion of loop line II also can satisfy simultaneously, the longitudinal zero-sequence power direction protection criterion at 3,4 places is also moved in the loop line II.
Claims (1)
1. the method for longitudinal zero-sequence power direction protection of a double-circuit lines on the same pole is characterized in that, this method comprises the steps:
(a) this side zero sequence power direction criterion and offside zero sequence power direction criterion are set
This side zero sequence power direction criterion is:
In the formula, 3I
0MBe this loop line M side zero-sequence current,
Be another loop line M side zero-sequence current, 3U
M0Be the bus residual voltage of protection installation place M side, Arg represent to the back measure phase angle mutually, K is the zero-sequence mutual inductance influence coefficient, zero-sequence mutual inductance influence coefficient value is
In the formula, Z
0Be the zero sequence impedance of circuit, Z
MBe mutual impedance between the double loop line;
Offside zero sequence power direction criterion is:
In the formula, 3I
0NBe this loop line N side zero-sequence current,
Be another loop line N side zero-sequence current, 3U
N0Be the bus residual voltage of protection installation place N side, Arg represent to its back measure phase angle mutually, K is the zero-sequence mutual inductance influence coefficient;
(b) decision making according to criterion
When satisfying (1) formula with (2) formula simultaneously, promptly in the decidable protection zone earth fault has appearred, the action of zero sequence power direction protection criterion; If only satisfy (1) formula or only satisfy (2) formula, then be judged to another loop line earth fault or external area error, the protection criterion is failure to actuate.
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CN102427223B (en) * | 2011-10-21 | 2014-06-18 | 浙江省电力公司 | Method for judging lock by zero sequence voltage and current |
CN103235198B (en) * | 2013-04-14 | 2015-03-25 | 国家电网公司 | Method for determining phase sequence arrangement modes of conducting wires of same-tower double-circuit transmission lines |
CN103762574B (en) * | 2014-02-18 | 2016-06-29 | 国家电网公司 | The non-same famous prime minister's cross-line impedance ground distance protecting method of double-circuit line |
CN103760407B (en) * | 2014-02-18 | 2016-06-08 | 国家电网公司 | The non-same famous prime minister's cross-line earth fault voltage magnitude of double-circuit line and phase angle measurement method |
CN103779847B (en) * | 2014-02-18 | 2016-04-06 | 国家电网公司 | Based on the guard method of SV network samples common-tower double-circuit lines single-phase earthing voltage ratio phase |
CN103762560B (en) * | 2014-02-18 | 2016-08-24 | 国家电网公司 | The non-same famous prime minister's cross-line earthing reactance distance protecting method of double-circuit line |
CN103944151B (en) * | 2014-04-10 | 2016-09-14 | 昆明理工大学 | A kind of guard method of many times parallel circuit different name phase two points ground fault of isolated neutral system |
CN104052035B (en) * | 2014-07-09 | 2017-02-15 | 国家电网公司 | Same-tower double-circuit line single-phase grounded reactance relay |
CN107947129B (en) * | 2016-10-12 | 2020-01-17 | 国网西藏电力有限公司 | Zero sequence protection method |
CN106405335B (en) * | 2016-11-02 | 2019-02-05 | 华北电力大学 | The ground fault setting method of wind-powered electricity generation T link |
CN107979067B (en) * | 2017-10-20 | 2022-07-08 | 中国电力科学研究院有限公司 | Zero sequence current protection method and system |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101246190A (en) * | 2008-03-25 | 2008-08-20 | 江苏省电力试验研究院有限公司 | Idem lever multi-loop overhead transmission line zero sequence equivalent impedance computing method in different modes |
-
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CN101246190A (en) * | 2008-03-25 | 2008-08-20 | 江苏省电力试验研究院有限公司 | Idem lever multi-loop overhead transmission line zero sequence equivalent impedance computing method in different modes |
Non-Patent Citations (5)
Title |
---|
Jongepier,A.G. |
Jongepier,A.G.;Van der Sluis,L..Adaptive distance protection of a double-circuit line.《Power Delivery,IEEE Transactions on》.1994,第9卷(第3期),第1289-1297页. * |
Van der Sluis,L..Adaptive distance protection of a double-circuit line.《Power Delivery,IEEE Transactions on》.1994,第9卷(第3期),第1289-1297页. |
索南加乐等.基于故障类型的零序方向元件.《中国电机工程学报》.2007,第27卷(第1期),第25-30页. * |
肖伟强等.同杆线路零序互感对纵联距离保护的影响.《电力系统自动化》.2009,第33卷(第3期),第84-88页. * |
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