CN103545798A - Distance protection method of fault opening elements in swing block - Google Patents

Distance protection method of fault opening elements in swing block Download PDF

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CN103545798A
CN103545798A CN201310492175.4A CN201310492175A CN103545798A CN 103545798 A CN103545798 A CN 103545798A CN 201310492175 A CN201310492175 A CN 201310492175A CN 103545798 A CN103545798 A CN 103545798A
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distance protection
protection
voltage
meet
distance
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CN103545798B (en
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王兴国
杜丁香
周泽昕
李仲青
李伟
李肖
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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Abstract

The invention relates to a distance protection method of fault opening elements in swing block. The distance protection method includes collecting three phase current and three phase voltage at protective mounting place; judging if entering swing block state or not; if yes, then go to the last but one step; if not, then go to next step; if degree of asymmetry of current is equal to and greater than 0.65, switching on distance protection; if not, then go to next step; if any voltage at swing center meets delayed 200ms opening distance protection I section, then opening distance protection II section instantly; if not, then go to next step; if any voltage at swing center meets delayed 200ms opening distance protection I section, then opening distance protection II section instantly; if not, block distance protection; if any voltage at swing center is met, then delaying 150ms opening distance protection; if not, go to next step; if any voltage at swing center is met, then delaying 150ms opening distance protection; if not, block distance protection; sensitivity of fault opening elements in swing block is increased, and distance protection is capable of performing right action after going through larger transition resistance fault.

Description

The distance protecting method of fault opening element in a kind of out-of-step blocking
Technical field
The present invention relates to the guard method of field of relay protection in power, be specifically related to the distance protecting method of fault opening element in a kind of out-of-step blocking.
Background technology
Distance protection is widely used in different electric pressure electric power systems as the backup protection of transmission line, transformer.
While there is vibration in electric power system, measure impedance cyclic variation, there is the possibility of malfunction in distance protection, for distance protection I, II section, because operate time is shorter, microcomputer protecting device takes out-of-step blocking element to prevent distance protection I, the misoperation in oscillatory process of II section, for distance protection III section, because operate time is longer, rely on action delay to escape vibration, for breaking down again in out-of-step blocking process, utilize the fault opening element open distance protection I in out-of-step blocking, II section, fault opening element is divided into the open element of unbalanced fault and the open element of symmetric fault.
Conventional current asymmetry degree m, as the open element of unbalanced fault, utilizes voltage of oscillation center
Figure BDA0000398178980000011
as the open element of symmetric fault.For the open element of unbalanced fault, when circuit is during in heavy service, occur when great transition grounding through resistance fault, current asymmetry degree m does not satisfy condition, cannot open distance protection, cause the protection cannot correct operation.For the open element of symmetric fault, voltage of oscillation center
Figure BDA0000398178980000012
generally take two-part, have overlap action district between the two, the open hour are inconsistent, and when occurring three-phase through transition resistive short, the open hour are longer, the rapidity of impact protection.
In sum, in existing out-of-step blocking, fault opening element is through great transition Resistance Fault, three-phase during through transition Resistance Fault under reply heavy load, and sensitivity is lower, cannot open distance protection when serious, cause protection tripping.
Summary of the invention
For the deficiencies in the prior art; the distance protecting method that the object of this invention is to provide fault opening element in a kind of out-of-step blocking; the method improves the sensitivity of fault opening element in out-of-step blocking, makes distance protection can correct operation when compared with great transition Resistance Fault.
The object of the invention is to adopt following technical proposals to realize:
The invention provides the distance protecting method of fault opening element in a kind of out-of-step blocking, its improvements are, described method comprises the steps:
(1) gather protection installation place three-phase current and three-phase voltage;
(2) judge whether to enter out-of-step blocking state;
(3) if
Figure BDA0000398178980000021
the absolute value that is mutually the negative-sequence current of benchmark is less than negative-sequence current definite value
Figure BDA0000398178980000022
and
Figure BDA0000398178980000023
the absolute value that is mutually the zero-sequence current of benchmark is less than zero-sequence current definite value
Figure BDA0000398178980000024
go to step (7), otherwise, go to step (4);
(4) if current asymmetry degree m >=0.65, open distance protection; Otherwise, go to step (5);
(5) if voltage of oscillation center in arbitraryly meet
Figure BDA0000398178980000026
time delay 200ms open distance protection I section, instantaneous open distance protection II section; Otherwise, go to step (6);
(6) if voltage of oscillation center
Figure BDA0000398178980000027
in arbitraryly meet
Figure BDA0000398178980000028
time delay 200ms open distance protection I section, instantaneous open distance protection II section; If m < 0.65, and
Figure BDA0000398178980000029
all meet
Figure BDA00003981789800000210
locking distance protection;
(7) if voltage of oscillation center
Figure BDA00003981789800000211
in arbitraryly meet
Figure BDA00003981789800000212
time, the protection of time delay 150ms open distance; Otherwise, go to step (8);
(8) if voltage of oscillation center in arbitraryly meet time, the protection of time delay 150ms open distance; If
Figure BDA00003981789800000216
all meet locking distance protection.
Further, in described step (1), protection installation place three-phase current is respectively
Figure BDA00003981789800000218
with
Figure BDA00003981789800000233
three-phase voltage is respectively
Figure BDA00003981789800000219
with
Figure BDA00003981789800000232
Further, in described step (2), if distance protection does not enter out-of-step blocking, directly open distance protection, if distance protection enters out-of-step blocking, calculates
Figure BDA00003981789800000220
be the forward-order current of benchmark mutually
Figure BDA00003981789800000221
be the negative-sequence current of benchmark mutually
Figure BDA00003981789800000222
be the zero-sequence current of benchmark mutually
Figure BDA00003981789800000223
current asymmetry degree m and voltage of oscillation center
Figure BDA00003981789800000224
Figure BDA00003981789800000234
be respectively A, B, C.
Further, described current asymmetry degree
Figure BDA00003981789800000225
described voltage of oscillation center
Figure BDA00003981789800000226
in i be respectively A, B, C, AB, BC and CA;
Described voltage of oscillation center
Figure BDA00003981789800000227
in U ibe respectively U a, U b, U c, U aB, U bCand U cA, by following expression formula, represent respectively: U A = | U &CenterDot; A | , U B = | U &CenterDot; B | , U C = | U &CenterDot; C | , U AB = | U &CenterDot; A - U &CenterDot; B | , U BC = | U &CenterDot; B - U &CenterDot; C | With U CA = | U &CenterDot; C - U &CenterDot; A | ;
Described voltage of oscillation center
Figure BDA00003981789800000230
in
Figure BDA00003981789800000235
be respectively
Figure BDA00003981789800000231
by following expression formula, represent respectively:
Figure BDA0000398178980000032
Figure BDA0000398178980000033
for line impedance angle;
Figure BDA0000398178980000034
unit be perunit value, its fiducial value is respectively the effective value of phase voltage or line voltage.
Further, in described step (3), I wherein 2.setfor negative-sequence current definite value, for failure judgement, whether be unbalanced fault; I 0.setfor zero-sequence current definite value, for failure judgement, whether be earth fault.
Further, in described step (4), meet
Figure BDA0000398178980000035
with
Figure BDA0000398178980000036
one of the two, m>=0.65 is judged as circuit generation unbalanced fault simultaneously.
Further, in described step (5), meet
Figure BDA0000398178980000037
with
Figure BDA0000398178980000038
one of the two, and m < 0.65, and
Figure BDA0000398178980000039
in arbitraryly meet time delay 200ms open distance protection I section, instantaneous open distance protection II section;
Arbitrary satisfied
Figure BDA00003981789800000311
be expressed as: meet following expression formula
Figure BDA00003981789800000312
Figure BDA00003981789800000314
with
Figure BDA00003981789800000315
any one; Wherein pu represents perunit value.
Further, in described step (6), meet
Figure BDA00003981789800000316
with
Figure BDA00003981789800000317
one of the two, and m < 0.65, and
Figure BDA00003981789800000318
in arbitraryly meet
Figure BDA00003981789800000319
time delay 200ms open distance protection I section, instantaneous open distance protection II section;
Described arbitrary satisfied
Figure BDA00003981789800000320
be expressed as: meet following expression formula
Figure BDA00003981789800000321
Figure BDA00003981789800000322
with
Figure BDA00003981789800000323
in any one;
Describedly all meet
Figure BDA00003981789800000324
be expressed as:
Figure BDA00003981789800000325
Figure BDA00003981789800000326
with expression formula all meets;
Wherein pu represents perunit value.
Further, in described step (7), arbitrary satisfied
Figure BDA0000398178980000041
be expressed as: meet
Figure BDA0000398178980000042
Figure BDA0000398178980000043
with
Figure BDA0000398178980000044
in any one; Wherein pu represents perunit value.
Further, in described step (8), arbitrary satisfied be expressed as:
Figure BDA0000398178980000046
Figure BDA0000398178980000047
with
Figure BDA0000398178980000048
in any one;
Describedly all meet
Figure BDA0000398178980000049
be expressed as:
Figure BDA00003981789800000411
with
Figure BDA00003981789800000412
all meet;
Wherein pu represents perunit value.
Compared with the prior art, the beneficial effect that the present invention reaches is:
The distance protecting method of fault opening element in out-of-step blocking provided by the invention; by improving symmetric fault open condition; redesigned symmetric fault open zone; the open time delay of protection while having reduced symmetric fault; the sensitivity that improves the open element of symmetric fault in out-of-step blocking, is conducive to excise fast three phase short circuit fault, guarantees system stable operation; for the open element of unbalanced fault, utilize current asymmetry degree m and voltage of oscillation center
Figure BDA00003981789800000413
work in coordination, the open serious unbalanced fault of m,
Figure BDA00003981789800000414
open slight unbalanced fault can correctly opened distance protection when compared with great transition Resistance Fault, improves the resistance to transition ability of distance protection.
Accompanying drawing explanation
Fig. 1 is the flow chart of the distance protecting method of fault opening element in out-of-step blocking provided by the invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Protection device for installing in circuit on power system, function comprises main protection and backup protection, for 110kV and above route protection, adopt distance protection to protect in support, distance protection is affected by system oscillation, protection I need to adjust the distance, II section is taked out-of-step blocking measure, in order to tackle the distance protection of breaking down during out-of-step blocking, cannot move, need to configure the open element of out-of-step blocking, the open element of out-of-step blocking is divided into the open element of symmetric fault and the open element of unbalanced fault, the open element the present invention is directed in out-of-step blocking improves, performance when raising distance protection is broken down during out-of-step blocking, fault opening element distances guard method in a kind of out-of-step blocking is provided.
The flow chart of the method as shown in Figure 1, comprises the steps:
(1) gather protection installation place three-phase current and three-phase voltage: three-phase current is respectively
Figure BDA0000398178980000051
with
Figure BDA00003981789800000520
three-phase voltage is respectively
Figure BDA0000398178980000052
with
(2) judge whether to enter out-of-step blocking state:
If distance protection does not enter out-of-step blocking, directly open distance protection, if distance protection enters out-of-step blocking, the A of take is example mutually, calculating A is the forward-order current of benchmark mutually
Figure BDA0000398178980000053
a is the negative-sequence current of benchmark mutually
Figure BDA0000398178980000054
a is the zero-sequence current of benchmark mutually
Figure BDA0000398178980000055
current asymmetry degree m and voltage of oscillation center
Figure BDA0000398178980000056
Described current asymmetry degree
Figure BDA0000398178980000057
described voltage of oscillation center
Figure BDA0000398178980000058
in i be respectively A, B, C, AB, BC and CA;
Described voltage of oscillation center
Figure BDA0000398178980000059
in U ibe respectively U a, U b, U c, U aB, U bCand U cA, by following expression formula, represent respectively: U A = | U &CenterDot; A | , U B = | U &CenterDot; B | , U C = | U &CenterDot; C | , U AB = | U &CenterDot; A - U &CenterDot; B | , U BC = | U &CenterDot; B - U &CenterDot; C | With U CA = | U &CenterDot; C - U &CenterDot; A | ;
Described voltage of oscillation center
Figure BDA00003981789800000512
in
Figure BDA00003981789800000521
be respectively
Figure BDA00003981789800000513
by following expression formula, represent respectively:
Figure BDA00003981789800000515
for line impedance angle.
(3) if the absolute value that A is the negative-sequence current of benchmark is mutually less than negative-sequence current definite value
Figure BDA00003981789800000517
and A is that the absolute value of the zero-sequence current of benchmark is less than zero-sequence current definite value mutually
Figure BDA00003981789800000518
go to step (7), otherwise, go to step (4); I wherein 2.setfor negative-sequence current definite value, for failure judgement, whether be unbalanced fault; I 0.setfor zero-sequence current definite value, for failure judgement, whether be earth fault.
(4) if current asymmetry degree m>=0.65, open distance protection; Otherwise, go to step (5); Meet with
Figure BDA0000398178980000062
one of the two, m>=0.65 is judged as circuit generation unbalanced fault simultaneously.
(5) meet
Figure BDA0000398178980000063
with
Figure BDA00003981789800000631
one of the two, and m < 0.65, and in arbitraryly meet time delay 200ms open distance protection I section, instantaneous open distance protection II section; Otherwise, go to step (6);
Arbitrary satisfied
Figure BDA0000398178980000066
be expressed as: meet following expression formula
Figure BDA0000398178980000067
Figure BDA0000398178980000068
Figure BDA0000398178980000069
with
Figure BDA00003981789800000610
any one; Wherein pu represents perunit value.；
Arbitrary satisfied
Figure BDA00003981789800000611
be expressed as: meet following expression formula
Figure BDA00003981789800000612
Figure BDA00003981789800000613
Figure BDA00003981789800000614
with
Figure BDA00003981789800000615
any one; Wherein pu represents perunit value.
(6) meet with
Figure BDA00003981789800000632
one of the two, and m < 0.65, and
Figure BDA00003981789800000617
in arbitraryly meet
Figure BDA00003981789800000618
time delay 200ms open distance protection I section, instantaneous open distance protection II section;
If m < 0.65, and
Figure BDA00003981789800000619
all meet locking distance protection;
Described arbitrary satisfied
Figure BDA00003981789800000622
be expressed as: meet following expression formula
Figure BDA00003981789800000623
with in any one;
Describedly all meet
Figure BDA00003981789800000627
be expressed as:
Figure BDA00003981789800000628
Figure BDA00003981789800000629
with
Figure BDA00003981789800000630
expression formula all meets; Wherein pu represents perunit value.
(7) if
Figure BDA0000398178980000071
and
Figure BDA00003981789800000726
and voltage of oscillation center
Figure BDA0000398178980000072
in arbitraryly meet time, the protection of time delay 150ms open distance; Otherwise, go to step (8);
Arbitrary satisfied
Figure BDA0000398178980000074
be expressed as: meet
Figure BDA0000398178980000075
Figure BDA0000398178980000076
Figure BDA0000398178980000077
with
Figure BDA0000398178980000078
in any one; Wherein pu represents perunit value.
(8) if and
Figure BDA00003981789800000710
and voltage of oscillation center in arbitraryly meet time, the protection of time delay 150ms open distance; If
Figure BDA00003981789800000713
all meet
Figure BDA00003981789800000714
locking distance protection;
Arbitrary satisfied
Figure BDA00003981789800000715
be expressed as:
Figure BDA00003981789800000717
Figure BDA00003981789800000718
with
Figure BDA00003981789800000719
in any one;
Describedly all meet
Figure BDA00003981789800000720
be expressed as:
Figure BDA00003981789800000721
Figure BDA00003981789800000722
with
Figure BDA00003981789800000723
all meet;
Wherein pu represents perunit value.
The distance protecting method of fault opening element in out-of-step blocking provided by the invention; by improving symmetric fault open condition; redesigned symmetric fault open zone; the open time delay of protection while having reduced symmetric fault; the sensitivity that improves the open element of symmetric fault in out-of-step blocking, is conducive to excise fast three phase short circuit fault, guarantees system stable operation; for the open element of unbalanced fault, utilize current asymmetry degree m and voltage of oscillation center work in coordination, the open serious unbalanced fault of m,
Figure BDA00003981789800000725
open slightly unbalanced fault not can correctly opened distance protection when compared with great transition Resistance Fault, improves the resistance to transition ability of distance protection.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although the present invention is had been described in detail with reference to above-described embodiment, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not depart from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.

Claims (10)

1. a distance protecting method for fault opening element in out-of-step blocking, is characterized in that, described method comprises the steps:
(1) gather protection installation place three-phase current and three-phase voltage;
(2) judge whether to enter out-of-step blocking state;
(3) if
Figure FDA0000398178970000011
the absolute value that is mutually the negative-sequence current of benchmark is less than negative-sequence current definite value and
Figure FDA0000398178970000013
the absolute value that is mutually the zero-sequence current of benchmark is less than zero-sequence current definite value
Figure FDA0000398178970000014
go to step (7), otherwise, go to step (4);
(4) if current asymmetry degree m >=0.65, open distance protection; Otherwise, go to step (5);
(5) if voltage of oscillation center
Figure FDA0000398178970000015
in arbitraryly meet
Figure FDA0000398178970000016
time delay 200ms open distance protection I section, instantaneous open distance protection II section; Otherwise, go to step (6);
(6) if voltage of oscillation center in arbitraryly meet
Figure FDA0000398178970000018
time delay 200ms open distance protection I section, instantaneous open distance protection II section; If m < 0.65, and
Figure FDA0000398178970000019
all meet
Figure FDA00003981789700000110
locking distance protection;
(7) if voltage of oscillation center
Figure FDA00003981789700000111
in arbitraryly meet time, the protection of time delay 150ms open distance; Otherwise, go to step (8);
(8) if voltage of oscillation center
Figure FDA00003981789700000113
in arbitraryly meet
Figure FDA00003981789700000114
time, the protection of time delay 150ms open distance; If
Figure FDA00003981789700000115
all meet
Figure FDA00003981789700000116
locking distance protection.
2. distance protecting method as claimed in claim 1, is characterized in that, in described step (1), protection installation place three-phase current is respectively
Figure FDA00003981789700000117
with
Figure FDA00003981789700000128
three-phase voltage is respectively
Figure FDA00003981789700000118
with
Figure FDA00003981789700000129
3. distance protecting method as claimed in claim 1, is characterized in that, in described step (2), if distance protection does not enter out-of-step blocking, directly open distance protection, if distance protection enters out-of-step blocking, calculates be the forward-order current of benchmark mutually
Figure FDA00003981789700000120
Figure FDA00003981789700000121
be the negative-sequence current of benchmark mutually
Figure FDA00003981789700000122
be the zero-sequence current of benchmark mutually
Figure FDA00003981789700000123
current asymmetry degree m and voltage of oscillation center
Figure FDA00003981789700000124
be respectively A, B, C.
4. distance protecting method as claimed in claim 3, is characterized in that, described current asymmetry degree
Figure FDA00003981789700000125
described voltage of oscillation center
Figure FDA00003981789700000126
in i be respectively A, B, C, AB, BC and CA;
Described voltage of oscillation center
Figure FDA00003981789700000127
in Ui be respectively U a, U b, U c, U aB, U bCand U cA, by following expression formula, represent respectively: U A = | U &CenterDot; A | , U B = | U &CenterDot; B | , U C = | U &CenterDot; C | , U AB = | U &CenterDot; A - U &CenterDot; B | , U BC = | U &CenterDot; B - U &CenterDot; C | With U CA = | U &CenterDot; C - U &CenterDot; A | ;
Described voltage of oscillation center in
Figure FDA0000398178970000024
be respectively
Figure FDA0000398178970000025
by following expression formula, represent respectively:
Figure FDA0000398178970000026
Figure FDA0000398178970000027
Figure FDA0000398178970000028
for line impedance angle;
Figure FDA00003981789700000226
unit be perunit value, its fiducial value is respectively the effective value of phase voltage or line voltage.
5. distance protecting method as claimed in claim 1, is characterized in that, in described step (3), and I wherein 2.setfor negative-sequence current definite value, for failure judgement, whether be unbalanced fault; I 0.setfor zero-sequence current definite value, for failure judgement, whether be earth fault.
6. distance protecting method as claimed in claim 1, is characterized in that, in described step (4), meets
Figure FDA0000398178970000029
with
Figure FDA00003981789700000210
one of the two, m>=0.65 is judged as circuit generation unbalanced fault simultaneously.
7. distance protecting method as claimed in claim 1, is characterized in that, in described step (5), meets
Figure FDA00003981789700000211
with
Figure FDA00003981789700000212
one of the two, and m < 0.65, and in arbitraryly meet
Figure FDA00003981789700000214
time delay 200ms open distance protection I section, instantaneous open distance protection II section;
Arbitrary satisfied
Figure FDA00003981789700000215
be expressed as: meet following expression formula
Figure FDA00003981789700000217
Figure FDA00003981789700000218
with
Figure FDA00003981789700000219
any one; Wherein pu represents perunit value.
8. distance protecting method as claimed in claim 1, is characterized in that, in described step (6), meets
Figure FDA00003981789700000220
with
Figure FDA00003981789700000221
one of the two, and m < 0.65, and
Figure FDA00003981789700000222
in arbitraryly meet
Figure FDA00003981789700000223
time delay 200ms open distance protection I section, instantaneous open distance protection II section;
Described arbitrary satisfied
Figure FDA00003981789700000224
be expressed as: meet following expression formula
Figure FDA00003981789700000225
Figure FDA0000398178970000031
with
Figure FDA0000398178970000032
in any one;
Describedly all meet
Figure FDA0000398178970000033
be expressed as:
Figure FDA0000398178970000035
with
Figure FDA0000398178970000036
expression formula all meets;
Wherein pu represents perunit value.
9. distance protecting method as claimed in claim 1, is characterized in that, in described step (7), arbitrary satisfied
Figure FDA0000398178970000037
be expressed as: meet
Figure FDA0000398178970000038
Figure FDA0000398178970000039
Figure FDA00003981789700000310
with
Figure FDA00003981789700000311
in any one; Wherein pu represents perunit value.
10. distance protecting method as claimed in claim 1, is characterized in that, in described step (8), arbitrary satisfied
Figure FDA00003981789700000312
be expressed as:
Figure FDA00003981789700000313
Figure FDA00003981789700000314
with
Figure FDA00003981789700000315
in any one;
Describedly all meet
Figure FDA00003981789700000316
be expressed as:
Figure FDA00003981789700000317
Figure FDA00003981789700000318
with
Figure FDA00003981789700000319
all meet;
Wherein pu represents perunit value.
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CN104332966A (en) * 2014-10-15 2015-02-04 国家电网公司 Distance protection analysis method based on two-dimensional plane
CN105071360A (en) * 2015-08-17 2015-11-18 中国电力科学研究院 Method for identifying adjacent line faults
CN105207176A (en) * 2015-08-17 2015-12-30 中国电力科学研究院 Line protection method
CN106253241A (en) * 2016-08-02 2016-12-21 华北电力大学 A kind of protection out-of-step blocking and open systems and control method thereof again
CN106329494A (en) * 2016-08-02 2017-01-11 华北电力大学 Oscillation center tracking and protection locking system and control method therefor

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