CN102279345A - Comprehensive phase selecting method for common-tower parallel transmission lines - Google Patents
Comprehensive phase selecting method for common-tower parallel transmission lines Download PDFInfo
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Abstract
The invention relates to the technical field of relay protection and relates to a comprehensive phase selecting method for common-tower parallel transmission lines. The method comprises the following steps of: eliminating mutual inductance current among phasors by using a six sequence component theory; distinguishing a ground fault from a non-ground fault according to a converted six sequence component and selecting a failed phase by the following steps; distinguishing a non-homonymous phase cross country fault, a single-line fault and a homonymous phase line fault according to the current magnitude characteristics of the single-line fault, the non-homonymous phase cross country fault and the homonymous phase line fault; specific to the single-line fault, selecting a failed line from two lines by judging whether the phase angles of homodromous positive and negative zero-sequence components surpassing inverse positive and negative zero-sequence components are 0 or 180 degrees, and selecting a phase according to a negative-sequence zero-sequence current phase selecting principle; and judging the fault types of homonymous phase and non-homonymous phase cross country faults. According to the method, the defect of incomplete phase selecting function even wrong phase selection of other conventional phase selecting methods applied to parallel transmission lines can be overcome.
Description
Technical field
The present invention relates to the relay protection field of electric system, particularly the fault phase-selecting method of same tower in the power transmission network and frame double back transmission line.
Background technology
Advantages such as the common-tower double-return line has small investment, save soil and unit corridor, transmission capacity is big are used widely in the power transmission network of China 220kV and above electric pressure at present.The fault of common-tower double-return line is very complicated, sees from failure mode to have 120 kinds, comprises 22 kinds of single line downs, 98 kinds of cross line faults.According to the requirement of dualization of main protection, the common-tower double-return line is except the two cover phase-splitting longitudinal differential protections outlet in parallel of single loop line electric weight is used in installing, and the main protection that also needs to install second principle is as vertical connection distance or direction etc.In addition, also need to adopt syllogic distance and zero-sequenceprotection in support.And the second principle main protection and back-up protection itself all do not possess phase-selecting function, and independent phase selection element need be set in protection, when breaking down on the circuit, and the separate common actions result who depends on measuring sensor in phase selection element and the protection of the tripping operation of protection.Because the common-tower double-return line not only has mutual inductance between phase and phase, adjacent line-to-line is wired mutual inductance also, makes its fault characteristic and single loop line differ widely.Therefore, realize choosing tripping operation mutually, the phase selection element to protection has proposed high requirement undoubtedly.
The facies principle that selects commonly used mainly contains two classes, and the choosing of sudden change amount is selected mutually with stable state fault amount mutually.Phase current difference sudden change amount is selected facies principle
[1-2]Come the failure judgement type by the sudden change numerical quantity before and after three phase current difference faults relatively, be usually used in the single back line as phase selection element, its acting characteristic that is used for the common-tower double-return line needs research.Document [3] has provided a kind of difference of phase currents that uses in conjunction with zero-sequence current phase-selecting method relatively, and property class patibhaga-nimitta difference between current sudden change amount is selected phase.Stable state fault amount is selected facies principle to mainly contain impedance and is selected phase, and voltage selects phase, and the choosing of preface electric current equates.Phase is selected in impedance
[2]Confirm the fault phase according to impedor measurement result, under most of faults of single loop line, can correctly select phase, but be subjected to the influence of trouble spot transition resistance bigger; To adopt the method for calculating 6 impedance measurement elements simultaneously to come the failure judgement phase when being applied to the common-tower double-return line, can correctly select phase when generally speaking cross line fault taking place, but calculated amount is too big, and can't declare outlet cross line fault type (this moment, two-phase or three-phase voltage were zero).Voltage selects phase
[2,4]It can't distinguish phase-to phase fault or the cross line fault in single loop line when being used for the common-tower double-return line.Sequence voltage selects phase
[5]Adopt the relative phase relation of voltage preface component to select phase, have the advantage that the zero sequence negative-sequence current selects phase, have the shortcoming of aforesaid voltage phase selection element too.The zero sequence negative-sequence current selects phase
[6～7]Be the facies principle that selects that adopts fault current preface component relative phase relation, have the advantage that the influence that is subjected to the fault transition resistance is less and not influenced by load current, can falsely drop phase but be used for the common-tower double-return line.
In sum, by the fault signature of common-tower double-return line is analyzed, invention is applicable to that the phase new departure that selects of common-tower double-return line has important significance for theories and practical value.
List of references
[1] Ge Yaozhong, novel relay protection and fault localization philosophy and technique, Xi'an: publishing house of Xi'an Communications University, 1996
[2] Zhu Shengshi, high-voltage fence Principles of Relay Protection and technology, Beijing: China Electric Power Publishing House, 1995
[3] Suo Nanjiale, Liu Dong, parallel lines on same tower transmission line of electricity cross line fault recognition component, Automation of Electric Systems, 2007 the 31st the 1st phases of volume, January 10
[4] Yu Bo, Yang Qixun, the research of double-circuit lines on the same pole protection phase selection element, Proceedings of the CSEE, the 23rd the 4th phase of volume, in April, 2003
[5] Wu Zaiqian, the research Institutes Of Technology Of Taiyuan master's degree opinion of 220kV double-circuit line on same pole relay protective plan, 2004.5
[6] Tang Baofeng, transmission line malfunction select phase Study on new method North China Electric Power University master thesis 2004.12
[7] Lin Xiangning, Liu Pei, Yang Chunming etc., based on the fault preface component phase selection element of correlation analysis, Proceedings of the CSEE, 2002,22 (5):
Summary of the invention
This technical barrier of fault choosing phase at the common-tower double-return line; the present invention proposes that a kind of phase-selecting function is perfect, the phase-selecting method of quick action; for providing with back-up protection, second main protection of common-tower double-return line effectively selects scheme mutually, for the safe and stable operation that guarantees power transmission network provides technical support.Technical scheme of the present invention is as follows:
A kind of comprehensive phase-selecting method that is used for tower and frame double loop, adopt following phase-selecting method when double loop breaks down:
(1) utilizes mutual inductance electric current between six each phasor of preface component method cancellation, obtain
With
Six preface components, T
0, T
1And T
2Represent same zero sequence respectively, with positive sequence with the negative phase-sequence amount; F
0, F
1And F
2Represent anti-zero sequence, preface and anti-negative phase-sequence amount anyway respectively;
(2) foundation
Amplitude whether be zero to distinguish earth fault and earth-free fault, when
The width of cloth is the zero earth fault that is judged to; Otherwise be judged to earth-free fault, in earth fault and earth-free fault, select the fault phase according to following step 3-6 respectively;
(3) according to the feature I of single line down
F1≠ 0, non-feature I with famous prime minister's cross line fault
F0≠ 0 and with the feature I of famous prime minister's cross line fault
F1=0, distinguish non-with famous prime minister's cross line fault, single line down and phase line fault of the same name;
(4) for single line down (as IAG), earlier the phase angle that is ahead of reverse positive and negative zero-sequence component according in the same way positive and negative zero-sequence component is 0 ° or being 180 ° selects fault wire from two circuits; After correct route selection, select facies principle to select phase according to negative phase-sequence, zero-sequence current, select the operation condition of phase as follows:
The time, select the A phase,
The time, select the B phase,
The time, select the C phase;
(5) for cross line fault (as IBCIIBC), as arg (T with the famous prime minister
2/ T
1) value be positioned at 0 °, 120 ° in the time of on-120 ° of symmetrical triangles, is single with famous prime minister's cross line fault; As arg (T
2/ T
1) value be positioned at-60 °, 60 °, in the time of on 180 ° of symmetrical triangles, for two with famous prime minister's cross line fault; Otherwise, be full phase cross line fault;
(6) for non-cross line fault (as IBCIIB),, then be judged to symmetrical cross line fault if voltage between phases reduces simultaneously with the famous prime minister; Otherwise, judge asymmetric cross line fault takes place, afterwards, select phase according to the following steps:
For asymmetric cross line fault, if two line phase to phase fault, according to
The relation that two values satisfy separately i.e. table 1, determines the fault phase; For the heterogeneous fault of two lines, utilize
Two values combine, and promptly table 2 is judged fault mutually respectively on which bar circuit.For symmetrical cross line fault,, utilize according to table 3, table 4 and table 5
The fault phase is selected in two amount combinations of difference in four amounts.
The cross line fault of table 1 liang line two-phase
The asymmetric cross line fault of table 2 liang line three-phase
The symmetrical cross line fault of table 3 liang line three-phase
The cross line fault of table 4 liang line four phases
The cross line fault of table 5 liang line five phases
Beneficial effect of the present invention is as follows:
1, this phase-selecting method theoretical foundation is solid, reliable, calculates six preface components and finishes in 15ms, and reaction velocity is fast.Select facies principle relatively with other, improve a lot on the performance, can remedy other phase-selecting method phase-selecting functions of being applied at present on the double loop not comprehensively even falsely drop the drawback of phase, for the common-tower double-return circuit provides a kind of practicable phase-selecting method.
2, this phase-selecting method is a kernel with six preface component methods,, zero-sequence current phase selection element negative in conjunction with having utilized and low-voltage phase selection element.Because having merged three kinds selects facies principle, three kinds of elements are got up according to certain logic organic assembling, than only adopting a kind of facies principle that selects selecting greatly raising in the phase accuracy.
3, no matter for to single line down, with famous prime minister's cross line fault right and wrong phase cross line fault of the same name also, the desirable phase effect that selects is arranged in theory all.Even fault occurs on the little transposition circuit, still very little to the influence of phase relation between six preface components, thereby this phase-selecting method has very strong adaptive faculty to the line parameter circuit value balance.
Description of drawings
Accompanying drawing 1 double loop system schematic.
Accompanying drawing 2 is non-to select phase with famous prime minister's cross line fault, and (a) non-asymmetric cross line fault with the famous prime minister selects phase; (b) non-symmetrical cross line fault with the famous prime minister selects phase.
Embodiment
Route selection principle of the present invention at first is described below.
For the common-tower double-return wire system shown in the accompanying drawing 1, can carry out fault analysis to it with six preface component methods, its essence is exactly the alternate mutual inductance of mutual inductance and single loop line between the line of decoupling zero double loop.Formula (1) is the transformation matrix between six-phase system and the six preface component systems
[1]
The essence of this step is that six phase currents are divided into two parts: three with vector (amount of passing through) and three reverse amounts (circulation).Because three with 120 ° of vectorial electric current mutual deviations, the induced potential that produces in reverse amount loop is cancelled each other, and the induced potential that the loop is measured in three each leisures of the oppositely amount of passing through electric current that have the loop of one's own is in the same way also cancelled out each other, therefore together, oppositely measuring has not had mutual inductance between the loop, constitute two independently three-phase systems thus.
Utilize the s-matrix of formula (2) respectively same, anti-phase amount to be carried out the symmetrical components conversion respectively again, the mutual inductance between the same three-phase system of cancellation has just formed six preface components.
A=e wherein
J120 °
With the decoupling zero total transform of M=P*S (formula (4)) expression, then flow through each phase current of double loop from six-phase system to six preface systems
With each phase voltage on the double loop M end bus
Transformation for mula as shown in Equation (4)
In the formula,
The same phasor of expression of leftover bits and pieces marker tape T, T
0, T
1And T
2Represent same zero sequence respectively, with positive sequence with the negative phase-sequence amount; F
0, F
1And F
2Represent anti-zero sequence, preface and anti-negative phase-sequence amount anyway respectively.Represent the amount of passing through between two loop lines with preface amount T, inverted sequence amount F represents the circulation between two loop lines.Obtain three after the conversion with phasor T
0, T
1And T
2With three anti-phase amount F
0, F
1And F
2Between do not had mutual inductance, formed six preface components of symmetry.
Have only when fault ground,
Non-vanishing, utilize whether its amplitude is zero can earlier the ground connection and the earth-free fault distinguish of double-circuit line on same pole being come.
In earth-free fault, the common trait of single line down is I
F1≠ 0; Non-common trait with famous prime minister's cross line fault is I
F0≠ 0; Common trait with famous prime minister's cross line fault is I
F1=0.So, can tell three major types type in the earth fault according to these characteristic areas.In like manner, can distinguish three major types type in the earth fault.
When determining to be single line down, accurately route selection is a key point of further selecting phase.When fault is IA-G, by analysis as can be known: the phase angle that positive and negative zero-sequence component in the same way is ahead of reverse positive and negative zero-sequence component is 0 °, i.e. arg (I
F1,2,0/ I
T1,2,0)=0 °; In like manner, at the B or the C of I loop line earth fault taking place mutually, when line to line fault ground connection, two-phase phase fault and three phase short circuit fault perhaps take place, above conclusion is arranged all.When the II loop line broke down, the phase angle that negative phase-sequence in the same way or zero-sequence component are ahead of reverse negative phase-sequence or zero-sequence component was 180 °.This feature can realize correct route selection just.After correct route selection, the negative phase-sequence zero-sequence current that directly is invoked at maturation application in the three-phase system selects facies principle
[4,6]Select phase, select the operation equation of phase as follows
The time, select A phase (5)
The time, select C phase (7)
When determining when being cross line fault with the famous prime minister, it should be noted that if that take place is IAIIA, IBIIB and ICIIC fault, then the six preface component phase features seen of protection are with just often identical.In fact, these 3 kinds of faults do not influence the operation of circuit, thereby can not consider in choosing mutually.With famous prime minister's earth-free fault, only there are two kinds of fault types: two with famous prime minister's cross line fault such as IBCIIBC and full cross line fault IABCIIABC mutually; With famous prime minister's earth fault, then there is single same famous prime minister, two with famous prime minister and complete three kinds of fault types of ground connection mutually.Theoretical analysis result shows: as arg (T
2/ T
1) value be positioned at 0 °, 120 ° in the time of on-120 ° of symmetrical triangles, is single with famous prime minister's cross line fault; As arg (T
2/ T
1) value be positioned at-60 °, 60 °, in the time of on 180 ° of symmetrical triangles, for two with famous prime minister's cross line fault; Otherwise, be full phase cross line fault.Because above feature is evenly distributed,, guarantee correctly to select phase so each judgment value is set allowance ± 30 ° in a week.
When determining right and wrong,, then protect the voltage between phases U of installation place if what take place is symmetrical cross line fault (being the separate ABC three-phase that comprised of cross line fault, as IAIIBC, IABIIBC, IABCIIC, ICIIAB etc.) with famous prime minister's cross line fault
AB, U
BC, U
CA, reduce simultaneously and approximately equal, and when asymmetric cross line fault took place, these 3 magnitudes of voltage differing bigger, the amplitude minimum of fault phase utilizes this feature can go out to distinguish symmetrical cross line fault and asymmetric cross line fault.For asymmetric cross line fault, if two line phase to phase fault, according to
The relation that two values satisfy separately i.e. table 1, determines the fault phase; For the heterogeneous fault of two lines, utilize
Two values combine, and promptly table 2 is judged fault mutually respectively on which bar circuit.For symmetrical cross line fault,, utilize according to table 3, table 4 and table 5
The fault phase is selected in two amount combinations of difference in four amounts.
Accompanying drawing 2 is described as follows: if U
AB=U
BC=U
CASatisfy, be judged to symmetrical cross line fault; If do not satisfy, be judged to asymmetric cross line fault.In asymmetric cross line fault, see three voltage U earlier
AB, U
BC, U
CA, whose minimum, asymmetric fault is exactly those two phases at minimum voltage place mutually, during the two line phase to phase fault listed according to table 1 again
Two relations that amount should satisfy are separately judged two faults mutually respectively on which bar circuit, as
And
Judge that then the fault that takes place is IBIIA; If the condition of table 1 does not all satisfy, what then judge whether to take place according to table 2 is two line three-phase faults, as
And
Judge that then the fault that takes place is IBCIIB.In symmetrical cross line fault, phase-selecting method is identical, for example as
And
Judge that then the fault that takes place is IABIIC, or the like.
As follows to selection method step of the present invention below:
When 1, double loop broke down, the Metzler matrix that utilizes formula (3) carried out conversion to each phase current of double loop, obtains not existing to each other six preface current weights of mutual inductance
With
2, foundation
Amplitude whether be zero to distinguish earth fault and earth-free fault.When
The width of cloth is the zero earth fault that is judged to; Otherwise be judged to earth-free fault.
3, no matter being ground connection or earth-free fault, all is to utilize I
F1And I
F0Amplitude Characteristics distinguish non-with famous prime minister's cross line fault, single line down and phase line fault of the same name.
4, for single line down, earlier the phase angle that is ahead of reverse positive and negative zero-sequence component according in the same way positive and negative zero-sequence component is 0 ° or being 180 ° selects fault wire from two circuits; After correct route selection, the negative phase-sequence, the zero-sequence current that directly are invoked at maturation application in the three-phase system select facies principle to select phase.
5, for famous prime minister's cross line fault the time, as arg (T
2/ T
1) value be positioned at 0 °, 120 ° in the time of on-120 ° of symmetrical triangles, is single with famous prime minister's cross line fault; As arg (T
2/ T
1) value be positioned at-60 °, 60 °, in the time of on 180 ° of symmetrical triangles, for two with famous prime minister's cross line fault; Otherwise, be full phase cross line fault.
6, non-cross line fault with the famous prime minister utilizes the step of accompanying drawing 2 to realize selecting phase.
Claims (1)
1. comprehensive phase-selecting method that is used for tower and frame double loop, adopt following phase-selecting method when double loop breaks down:
(1) utilizes mutual inductance electric current between six each phasor of preface component method cancellation, obtain
With
Six preface components, T
0, T
1And T
2Represent same zero sequence respectively, with positive sequence with the negative phase-sequence amount; F
0, F
1And F
2Represent anti-zero sequence, preface and anti-negative phase-sequence amount anyway respectively;
(2) foundation
Amplitude whether be zero to distinguish earth fault and earth-free fault, when
The width of cloth is the zero earth fault that is judged to; Otherwise be judged to earth-free fault, in earth fault and earth-free fault, select the fault phase according to following step 3-6 respectively;
(3) according to the feature I of single line down
F1≠ 0, non-feature I with famous prime minister's cross line fault
F0≠ 0 and with the feature I of famous prime minister's cross line fault
F1=0, distinguish non-with famous prime minister's cross line fault, single line down and phase line fault of the same name;
(4) for single line down (as IAG), earlier the phase angle that is ahead of reverse positive and negative zero-sequence component according in the same way positive and negative zero-sequence component is 0 ° or being 180 ° selects fault wire from two circuits; After correct route selection, select facies principle to select phase according to negative phase-sequence, zero-sequence current, select the operation condition of phase as follows:
The time, select the A phase,
The time, select the B phase,
The time, select the C phase;
(5) for cross line fault (as IBCIIBC), as arg (T with the famous prime minister
2/ T
1) value be positioned at 0 °, 120 ° in the time of on-120 ° of symmetrical triangles, is single with famous prime minister's cross line fault; As arg (T
2/ T
1) value be positioned at-60 °, 60 °, in the time of on 180 ° of symmetrical triangles, for two with famous prime minister's cross line fault; Otherwise, be full phase cross line fault;
(6) for non-cross line fault (as IBCIIB),, then be judged to symmetrical cross line fault if ask that mutually voltage reduces simultaneously with the famous prime minister; Otherwise, judge asymmetric cross line fault takes place, afterwards, select phase according to the following steps:
For asymmetric cross line fault, if two line phase to phase fault, according to
The relation that two values satisfy separately i.e. table 1, determines the fault phase; For the heterogeneous fault of two lines, utilize
Two values combine, and promptly table 2 is judged fault mutually respectively on which bar circuit; For symmetrical cross line fault,, utilize according to table 3, table 4 and table 5
The fault phase is selected in two amount combinations of difference in four amounts.
The cross line fault of table 1 liang line two-phase
The asymmetric cross line fault of table 2 liang line three-phase
The symmetrical cross line fault of table 3 liang line three-phase
The cross line fault of table 4 liang line four phases
The cross line fault of table 5 liang line five phases
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| CN103207346A (en) * | 2013-03-13 | 2013-07-17 | 福建省电力有限公司 | Power transmission line fault phase selection method |
| CN103779850A (en) * | 2014-02-18 | 2014-05-07 | 国家电网公司 | Double-circuit line single-phase grounding distance protection method based on direct-mining direct-jumping communication mode |
| CN103869221A (en) * | 2014-02-21 | 2014-06-18 | 国家电网公司 | SV network sampling-based double-circuit line single-phase earth fault distance measurement method |
| CN104111407A (en) * | 2014-07-09 | 2014-10-22 | 华中科技大学 | Fault detection method based on impedance ratio same-tower power transmission line transverse differential protection |
| CN104237741A (en) * | 2014-09-28 | 2014-12-24 | 中国南方电网有限责任公司 | Intelligent station domain information based double-circuit line fault phase selection method |
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| CN106124927A (en) * | 2016-06-20 | 2016-11-16 | 山东大学 | The asynchronous fault distance-finding method of double-circuit lines on the same pole containing series compensation |
| CN104155572B (en) * | 2014-07-15 | 2017-02-22 | 华南理工大学 | Fault line selection method for same-tower double-circuit direct current transmission line |
| CN106569093A (en) * | 2016-11-02 | 2017-04-19 | 南方电网科学研究院有限责任公司 | Fault discrimination method for same-tower multi-loop power transmission line |
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| 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 |
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| CN103779850B (en) * | 2014-02-18 | 2016-04-06 | 国家电网公司 | Based on directly adopting straight jumping communication mode double-circuit line single-phase earthing distance protecting method |
| CN103869221B (en) * | 2014-02-21 | 2016-04-20 | 国家电网公司 | Based on the double-circuit line singlephase earth fault distance measurement method of SV network samples |
| CN103869221A (en) * | 2014-02-21 | 2014-06-18 | 国家电网公司 | SV network sampling-based double-circuit line single-phase earth fault distance measurement method |
| CN104111407A (en) * | 2014-07-09 | 2014-10-22 | 华中科技大学 | Fault detection method based on impedance ratio same-tower power transmission line transverse differential protection |
| CN104155572B (en) * | 2014-07-15 | 2017-02-22 | 华南理工大学 | Fault line selection method for same-tower double-circuit direct current transmission line |
| CN104237741A (en) * | 2014-09-28 | 2014-12-24 | 中国南方电网有限责任公司 | Intelligent station domain information based double-circuit line fault phase selection method |
| CN106814282B (en) * | 2015-11-27 | 2020-01-17 | 中国电力科学研究院 | Phase selection method for double circuit lines on same pole |
| CN106814282A (en) * | 2015-11-27 | 2017-06-09 | 中国电力科学研究院 | A kind of double-circuit line on same pole phase-selecting 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 |
| CN105891579A (en) * | 2016-03-29 | 2016-08-24 | 国网福建省电力有限公司 | Method of realizing synchronization of sampling values of double circuit lines on the same tower by using fault opposite negative phase-sequence current phase characteristics |
| CN105738769A (en) * | 2016-03-31 | 2016-07-06 | 山东大学 | Series-compensation double-circuit line fault locating method based on distributed parameter model |
| CN105738769B (en) * | 2016-03-31 | 2018-10-09 | 山东大学 | Series compensation double line down localization method based on distributed parameter model |
| CN106124927A (en) * | 2016-06-20 | 2016-11-16 | 山东大学 | The asynchronous fault distance-finding method of double-circuit lines on the same pole containing series compensation |
| CN106569093A (en) * | 2016-11-02 | 2017-04-19 | 南方电网科学研究院有限责任公司 | Fault discrimination method for same-tower multi-loop power transmission line |
| CN107015115A (en) * | 2017-04-13 | 2017-08-04 | 南京电力工程设计有限公司 | A kind of fault distance-finding method of same tower double back transmission line |
| CN107271845A (en) * | 2017-06-20 | 2017-10-20 | 广东电网有限责任公司中山供电局 | A kind of online distance-finding method of protection fault information management system |
| CN109814002A (en) * | 2019-03-12 | 2019-05-28 | 中国电力科学研究院有限公司 | A kind of method and system obtaining multiple-loop line transmission system fault severity level |
| CN109814001A (en) * | 2019-03-12 | 2019-05-28 | 中国电力科学研究院有限公司 | A kind of method and system obtaining multiple-loop line transmission system fault severity level |
| CN109814001B (en) * | 2019-03-12 | 2023-06-16 | 中国电力科学研究院有限公司 | Method and system for obtaining fault severity of same-tower multi-circuit power transmission system |
| CN110133452A (en) * | 2019-07-01 | 2019-08-16 | 华北电力大学 | Mixed pressure based on waveform correlation coefficient and jump-value of current is the same as tower fault phase-selecting method |
| CN110133452B (en) * | 2019-07-01 | 2020-03-10 | 华北电力大学 | Mixed-voltage same-tower fault phase selection method based on waveform correlation coefficient and current mutation quantity |
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