CN101710164A - Transmission line malfunction directional element - Google Patents
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Abstract
The invention provides a transmission line malfunction directional element, comprising a wavefront polarity acquisition unit 100, an initial polarity acquisition unit 200 and a comparison unit 300, wherein the wavefront polarity acquisition unit 100 is used for acquiring the wavefront polarity MMIalpha, MMIbeta and MMIgamma from three current modulus malfunction transient travelling wave of a transmission line; the initial polarity acquisition 200 unit is used for acquiring the initial polarity Salpha, Sbeta and Sgamma from power frequency components of the three current modulus malfunction transient travelling wave; and the comparison unit 300 is used for comparing the wavefront polarity MMIalpha, MMIbeta and MMIgamma of the three current modulus malfunction transient travelling waves with the initial polarity of the power frequency of the voltage malfunction transient travelling wave of the corresponding modulus respectively and determining the malfunction direction of the transmission line according to the judgment result, thus solving the problem that the travelling wave malfunction directional element and travelling wave directional protection capable of being applied in the actual power system can not be formed for a long time due to that the capacitor voltage transformer is unable to transmit the wavefront of the transient voltage malfunction travelling wave.
Description
Technical field
The present invention relates to relay protection of power system and fault detection technique field, relate in particular to the transmission line fault direction detection range.
Background technology
Ultra-high-tension power transmission line parameter particularly super, the extra-high voltage long distance transmission line has tangible distribution parameter feature.Traditional relay protection based on the power frequency electric parameters is subjected to the influence of factors such as transmission line of electricity distributed capacitance, current transformer be saturated, the accurately fault on the detection line.But in fact the fault transient travelling wave after the fault has comprised abundant failure message.Voltage failure transient state travelling wave wave head after the fault and current failure transient state travelling wave wave head signal are signals that spectral range is very wide, are the signal of a full frequency-domain in theory.As far back as the fifties in last century Chinese scholars just begin one's study based on the relay protection of fault transient travelling wave, and multiple traveling-wave protection principle and scheme have been proposed.But existing studies show that, the current transformer of using in the electric system is progress of disease fault current fault transient travelling wave effectively, widely used voltage transformer (VT)---capacitance type potential transformer in electric system 220kV and above electric pressure, the voltage signal of a very narrow frequency band about only can progress of disease electric system frequency of operation (50Hz or 60Hz), can not be effectively with the false voltage fault transient travelling wave wave head progress of disease of electric system primary side secondary side to mutual inductor.Therefore can't realize based on the fault direction detection and the direction protection of voltage failure transient state travelling wave and current failure transient state travelling wave that this also is for many years a technical matters that not have solution in the electric system traveling-wave protection research field.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of transmission line malfunction directional element, comprising: wave head polarity acquiring unit 100, obtain the wave head polarity MMI of each electric current modulus fault transient travelling wave of transmission line of electricity respectively
α, MMI
β, MMI
γInitial polarity acquiring unit 200 obtains the initial polarity S of power frequency component in each voltage modulus fault transient travelling wave of described transmission line of electricity respectively
α, S
β, S
γComparing unit 300 is with the wave head polarity MMI of described each electric current modulus fault transient travelling wave
α, MMI
β, MMI
γRespectively with the described voltage failure transient state travelling wave of corresponding modulus in the initial polarity of power frequency component compare, and determine the fault direction of described transmission line of electricity according to judged result.
In technique scheme, preferably, described wave head polarity acquiring unit 100: current sampling unit 102, under the normal operating condition of transmission line of electricity, electric current to described transmission line of electricity carries out real-time sampling and storage, and sampling rate is 400kHz, obtains the sampled value sequence of electric current; Current data processing unit 104 is at first when described transmission line of electricity breaks down, to the three-phase electricity flow valuve i that is gathered
a(n), i
b(n), i
c(n) carry out triumphant human relations Bel conversion, the three-phase current decoupling zero that has an electromagnetic coupled relation is three modulus current i independently
α(n), i
β(n), i
γ(n); Then to described three modulus current i
α(n), i
β(n), i
γ(n) carry out wavelet transformation, try to achieve corresponding wavelet conversion coefficient; Ask for the modulus maximum of described wavelet conversion coefficient at last respectively, and come to determine respectively the wave head polarity of described current failure transient state travelling wave according to the polarity of described modulus maximum.
In technique scheme, preferably, triumphant human relations Bel is transformed in described current data processing unit 104:
In described current data processing unit 104, the derived function that adopts three subcenter B-spline functions is as wavelet function.In described current data processing unit 104, the modulus maximum of described wavelet conversion coefficient is: for arbitrary given positive number ε, when | n-n
0| when＜ε satisfies, to n ≠ n arbitrarily
0If,
Set up, then think
Be the modulus maximum of described wavelet conversion coefficient, wherein n is a sampling sequence number, n
0Be the pairing sampling sequence number of modulus maximum,
Be described wavelet conversion coefficient, j is the yardstick of wavelet transformation.
In technique scheme, preferably, comprise in the described initial polarity acquiring unit 200:
Voltage sample unit 202 under the normal operating condition, carries out real-time sampling and storage to the voltage of described transmission line of electricity, and sampling rate is 20kHz, obtains the sampled value sequence of described voltage;
Voltage data processing unit 204 at first when described transmission line malfunction, extracts power frequency component u in each phase voltage fault transient travelling wave of described transmission line of electricity
Fttpa, u
Fttpb, u
FttpcFollow described power frequency component u to being extracted
Fttpa, u
Fttpb, u
FttpcCarry out triumphant human relations Bel conversion, the three-phase voltage decoupling zero that has an electromagnetic coupled relation is three modulus voltage u independently
Fttp α, u
Fttp β, u
Fttp γRespectively the starting stage sampled value of power frequency component in described three modulus current fault transient state travelling waves is sued for peace then; Determine the initial polarity of the power frequency component in the described voltage failure transient state travelling wave at last according to summed result.
In technique scheme, preferably, the described starting stage began to the time interval of schedule time end for the moment that arrives bus capacitor formula voltage transformer (VT) from described fault transient travelling wave after the described fault.
In technique scheme, preferably, the described schedule time is 2 milliseconds.
In technique scheme, preferably, use sign function to determine the initial polarity of the power frequency component in the described voltage failure transient state travelling wave in the described initial polarity acquiring unit 200.
In technique scheme, preferably, described comparing unit 300, the initial polarity of power frequency component is opposite in the described voltage failure transient state travelling wave of the wave head polarity of the arbitrary modulus in the wave head polarity of determining described each electric current modulus fault transient travelling wave and corresponding modulus, and then definite described transmission line malfunction is the forward fault.
In technique scheme, preferably, described comparing unit 300 when the wave head polarity of determining described each electric current modulus fault transient travelling wave is all identical with the initial polarity of power frequency component in the described voltage failure transient state travelling wave of corresponding modulus, determines that then described transmission line malfunction is a reverse fault.
Thereby; the present invention can not arrive the voltage failure transient state travelling wave wave head progress of disease of electric system primary side under the situation of capacitance type potential transformer secondary side effectively at capacitance type potential transformer; make full use of the effect of current failure transient state travelling wave in Power System Faults Detection; utilize that the power frequency component in the voltage failure transient state travelling wave comes the polarization current fault transient travelling wave after the available fault of capacitance type potential transformer secondary side; thereby determine fault direction; and then constitute a kind of transmission line fault direction discriminating element that can be practical, finally realize the transmission line travelling wave direction protection.
Though the wave head that capacitance type potential transformer can not progress of disease voltage failure transient state travelling wave; but after the fault in the voltage failure transient state travelling wave; the wave head that not only comprises the voltage failure transient state travelling wave; also comprised a large amount of power frequency components simultaneously; these power frequency components be can the progress of disease to the secondary side of capacitance type potential transformer; and the initial polarity of power frequency component is consistent in the wave head polarity of voltage failure transient state travelling wave and the voltage failure transient state travelling wave; so can be with the power frequency component initial polarity in the voltage fault transient travelling wave and the wave head polar organization polarity comparison expression fault direction detection element of current failure transient state travelling wave, thus solved for a long time since capacitance type potential transformer can not progress of disease voltage failure transient state travelling wave wave head and can't constitute the traveling wave fault direction detecting element that can be applicable to practical power systems and this difficult problem of row ripple direction protection.
Description of drawings
Fig. 1 is the structural drawing of transmission line malfunction directional element according to an embodiment of the invention;
Fig. 2 is the structural drawing of the wave head polarity acquiring unit 100 shown in Fig. 1;
Fig. 3 is the structural drawing of the initial polarity acquiring unit 200 shown in Fig. 1;
Fig. 4 is the schematic diagram of transmission line malfunction directional element according to a preferred embodiment of the present invention;
Fig. 5 is the criterion figure according to the forward fault in the transmission line malfunction directional element of the present invention; And
Fig. 6 is the criterion figure according to the reverse fault in the transmission line malfunction directional element of the present invention.
Embodiment
Fig. 1 shows the structural drawing of transmission line malfunction directional element according to an embodiment of the invention.This transmission line malfunction directional element comprises: wave head polarity acquiring unit 100, obtain the wave head polarity MMI of each electric current modulus fault transient travelling wave of transmission line of electricity respectively
α, MMI
β, MMI
γInitial polarity acquiring unit 200 obtains the initial polarity S of power frequency component in each voltage modulus fault transient travelling wave of described transmission line of electricity respectively
α, S
β, S
γComparing unit 300 is with the wave head polarity MMI of described each electric current modulus fault transient travelling wave
α, MMI
β, MMI
γRespectively with the described voltage failure transient state travelling wave of corresponding modulus in the initial polarity of power frequency component compare, and determine the fault direction of described transmission line of electricity according to judged result.
In technique scheme, preferably, as shown in Figure 2.Described wave head polarity acquiring unit 100 comprises: current sampling unit 102, under the normal operating condition of transmission line of electricity, the electric current of described transmission line of electricity is carried out real-time sampling and storage, and sampling rate is 400kHz, obtains the sampled value sequence of electric current; Current data processing unit 104, when being used for described transmission line of electricity and breaking down, three-phase electricity flow valuve i at first to being gathered
a(n), i
b(n), i
c(n) carry out triumphant human relations Bel conversion, the three-phase current decoupling zero that has an electromagnetic coupled relation is three modulus current i independently
α(n), i
β(n), i
γ(n); Then to described three modulus current i
α(n), i
β(n), i
γ(n) carry out wavelet transformation, try to achieve corresponding wavelet conversion coefficient; Ask for the modulus maximum of described wavelet conversion coefficient at last respectively, and come to determine respectively the wave head polarity of described current failure transient state travelling wave according to the polarity of described modulus maximum.
In technique scheme, preferably, described current data processing unit 104, the derived function that adopts three subcenter B-spline functions is as wavelet function.The modulus maximum of described wavelet conversion coefficient is: for arbitrary given positive number ε, when | n-n
0| when＜ε satisfies, to n ≠ n arbitrarily
0If,
Set up, then think
Be the modulus maximum of described wavelet conversion coefficient, wherein n is a sampling sequence number, n
0Be the pairing sampling sequence number of modulus maximum,
Be described wavelet conversion coefficient, j is the yardstick of wavelet transformation.
In technique scheme, preferably, described initial polarity acquiring unit 200 comprises:
Voltage sample unit 202 under the normal operating condition, carries out real-time sampling and storage to the voltage of described transmission line of electricity, and sampling rate is 20kHz, obtains the sampled value sequence of described voltage;
Voltage data processing unit 204 at first when described transmission line malfunction, extracts power frequency component u in each phase voltage fault transient travelling wave of described transmission line of electricity
Fttp α, u
Fttpb, u
TttpcFollow described power frequency component u to being extracted
Fttpa, u
Ffttpb, u
FfttpcCarry out triumphant human relations Bel conversion, the three-phase voltage decoupling zero that has an electromagnetic coupled relation is three modulus voltage u independently
Fttp α, u
Fttp β, u
Fttp γRespectively the starting stage sampled value of power frequency component in described three modulus current fault transient state travelling waves is sued for peace then; Determine the initial polarity of the power frequency component in the described voltage failure transient state travelling wave at last according to summed result.
In technique scheme, preferably, the described starting stage began to the time interval of schedule time end for the moment that arrives bus capacitor formula voltage transformer (VT) from described fault transient travelling wave after the described fault.
In technique scheme, preferably, the described schedule time is 2 milliseconds.
In technique scheme, preferably, described initial polarity acquiring unit 200 uses sign function to determine the initial polarity of the power frequency component in the described voltage failure transient state travelling wave.
In technique scheme, preferably, in described comparing unit 300, the initial polarity of power frequency component is opposite in the described voltage failure transient state travelling wave of the wave head polarity of the arbitrary modulus in the wave head polarity of determining described each electric current modulus fault transient travelling wave and corresponding modulus, and then definite described transmission line malfunction is the forward fault.
In technique scheme, preferably, in described comparing unit 300, when the wave head polarity of determining described each electric current modulus fault transient travelling wave is all identical with the initial polarity of power frequency component in the described voltage failure transient state travelling wave of corresponding modulus, determine that then described transmission line malfunction is a reverse fault.
Fig. 4 is the process flow diagram of transmission line malfunction directional element according to a preferred embodiment of the present invention.
The process flow diagram of preferential embodiment of the present invention may further comprise the steps as shown in Figure 4:
1) current failure transient state travelling wave wave head polarity obtains
1.1) under the normal operating condition, the electric current of transmission line of electricity is carried out real-time sampling and storage, sampling rate is 400kHz, obtains the sampled value sequence of electric current, when transmission line of electricity breaks down, three-phase electricity flow valuve i at first to gathering
a(n), i
b(n), i
c(n) carry out triumphant human relations Bel (Karenbauer) conversion, the three-phase current decoupling zero that has an electromagnetic coupled relation is three modulus current i independently
α(n), i
β(n), i
γ(n).
1.2) fault after-current fault transient travelling wave i to collecting
α(n), i
β(n), i
γ(n) carry out the wavelet conversion coefficient that wavelet transformation is tried to achieve each modulus electric current correspondence
In the present embodiment, wavelet function adopts the derived function of three subcenter B-spline functions as wavelet function.Wavelet coefficient sequence { h
k}
K ∈ Z, { g
k}
K ∈ ZFor:
{h
k}＝(0.125，0.375，0.375，0.125) (k＝-1，0，1，2)；
{g
k}＝(-2，2)(k＝0，1).
After adopting above-mentioned wavelet transformation, the small echo that the discrete signal i (n) of fault current can be decomposed into it approaches and wavelet transformation
In the formula
For the small echo of current signal i (n) approaches coefficient,
Wavelet conversion coefficient for current signal.
1.3) wavelet conversion coefficient of each modulus electric current is asked for modulus maximum MMI
α, MMI
β, MMI
γ
The modulus maximum of wavelet transformation is defined as:
To arbitrary given positive number ε＞0, when | n-n
0| when＜ε satisfies, to n ≠ n arbitrarily
0, have
Set up, then claim
Be the modulus maximum of wavelet conversion coefficient, the modulus maximum of wavelet conversion coefficient is actual to be the local maximum of wavelet conversion coefficient.The modulus maximum polarity of current signal wavelet transformation has just been represented the polarity of current failure transient state travelling wave wave head.
2) extraction of power frequency component in the voltage failure transient state travelling wave
2.1) under the normal operating condition, voltage to transmission line of electricity carries out real-time sampling and storage, sampling rate is 20kHz, obtain the sampled value sequence of voltage, when transmission line malfunction, deduct the voltage sample point u (n-N) of 2 times the previous power frequency period correspondence of fault with the voltage sample point u (n) after the fault, add the voltage sample point u (n-2N) of preceding two the power frequency period correspondences of fault, extract power frequency component u in each phase voltage fault transient travelling wave with following formula
Fttpa, u
Fttpb, u
Fttpc
u
fttpm(n)＝u
m(n)-2u
m(n-N)+u
m(n-2N)
U in the following formula
Fttpm(n) be the power frequency component discrete sampling point in the capable ripple of false voltage after the line fault, N is the sampling number of a power frequency period, N=400 in the present embodiment, and m represents a, b, c three-phase.
2.2) three-phase voltage value u to gathering
Fttpa, u
Fttpb, u
FttpcCarry out triumphant human relations Bel (Karenbauer) conversion, the three-phase voltage decoupling zero that has an electromagnetic coupled relation is three modulus voltage u independently
Fttp α, u
Fttp β, u
Fttp γ
2.3) with following formula the sampled value of power frequency component starting stage in the voltage failure transient state travelling wave is sued for peace.
K is the moment corresponding sampling points that fault transient travelling wave arrives bus capacitor formula voltage transformer (VT) place after the fault in the formula, k
2For with sampled point k
1Differ 2 milliseconds of corresponding sampling points.u
SummIn subscript sum represent the summation, second subscript m represented modulus α, beta, gamma, u
FttpmIn subscript fttp represent power frequency component in the fault transient travelling wave, subscript m is represented modulus α, beta, gamma.
2.4) try to achieve the initial polarity of power frequency component in the voltage failure transient state travelling wave with following formula.
S
m＝sgn(u
summ)
M represents modulus α, beta, gamma in the formula.
3) go the direction determining of ripple directional element
3.1) to obtaining current failure transient state travelling wave wave head polarity MMI
α, MMI
β, MMI
γInitial polarity S with power frequency component in the voltage failure transient state travelling wave
α, S
β, S
γCompare.The forward criterion of fault direction detection when the polarity of power frequency component in the polarity of arbitrary modulus current failure transient state travelling wave wave head and the corresponding modulus current fault transient state travelling wave is opposite, is judged to be the forward fault as shown in Figure 5.
3.2) the reverse criterion of fault direction detection as shown in Figure 6, when the initial polarity of power frequency component in the polarity of electric current modulus fault transient travelling wave wave head and the corresponding voltage modulus fault transient travelling wave is all identical, be judged to be reverse fault.
Thereby; the present invention can not arrive the voltage failure transient state travelling wave wave head progress of disease of electric system primary side under the situation of capacitance type potential transformer secondary side effectively at capacitance type potential transformer; make full use of the effect of current failure transient state travelling wave in Power System Faults Detection; utilize that the power frequency component in the voltage failure transient state travelling wave comes the polarization current fault transient travelling wave after the available fault of capacitance type potential transformer secondary side; thereby determine fault direction; and then constitute a kind of transmission line fault direction discriminating element that can be practical, finally realize the transmission line travelling wave direction protection.
Though the wave head that capacitance type potential transformer can not progress of disease voltage failure transient state travelling wave; but after the fault in the voltage failure transient state travelling wave; the wave head that not only comprises the voltage failure transient state travelling wave; also comprised a large amount of power frequency components simultaneously; these power frequency components be can the progress of disease to the secondary side of capacitance type potential transformer; and the initial polarity of power frequency component is consistent in the wave head polarity of voltage failure transient state travelling wave and the voltage failure transient state travelling wave; so can be with the power frequency component initial polarity of voltage fault transient travelling wave and the wave head polar organization polarity comparison expression malfunction directional element of current failure transient state travelling wave, thus solved for a long time since capacitance type potential transformer can not progress of disease voltage failure transient state travelling wave wave head and can't constitute the traveling wave fault direction detecting element that can be applicable to practical power systems and this difficult problem of row ripple direction protection.
The present invention at first utilizes wavelet transformation and modulus maximum algorithm thereof to extract the polarity of each electric current modulus fault transient travelling wave wave head after the fault, deduct the voltage sample point value of the previous power frequency period correspondence of fault of twice then with the voltage sample point value after the fault, add the voltage sample point value of preceding two the power frequency period correspondences of fault, extract power frequency component in each phase voltage fault transient travelling wave, and do phase-model transformation, try to achieve power frequency component in each voltage modulus fault transient travelling wave, and then the fault transient travelling wave after the fault of power frequency component in each voltage modulus fault transient travelling wave arrived sampled value summation in two milliseconds of time periods that moment of bus capacitor formula voltage transformer (VT) begins, and extract the initial polarity of the polarity of summed result as power frequency component in each voltage modulus fault transient travelling wave.And relatively in each voltage modulus fault transient travelling wave the polarity judging fault direction of the initial polarity of power frequency component and each electric current modulus fault transient travelling wave wave head be forward or oppositely.
The present invention has utilized " after the fault in the voltage failure transient state travelling wave polarity of the initial polarity of power frequency component and wave head consistent " this characteristic; with the initial polarity of the power frequency component in the voltage fault transient travelling wave and a kind of capable ripple directional element that can be applicable to electric system reality of wave head polar organization of current failure transient state travelling wave, in order to constitute the transmission line travelling wave direction protection.Overcome traditional capable ripple directional element because the effective progress of disease voltage failure transient state travelling wave wave head and can not be applied to this difficult problem of practical power systems of capacitance type potential transformer.This row ripple directional element quick action is not subjected to that current transformer is saturated to be influenced, and jam-tolerant transition resistance ability is strong, is not subjected to the influence of long line capacitance current, is suitable for constituting that high-tension line is particularly super, the vertical row ripple direction protection of extra high voltage line.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a transmission line malfunction directional element is characterized in that, comprising:
Wave head polarity acquiring unit obtains the wave head polarity MMI of each electric current modulus fault transient travelling wave of transmission line of electricity respectively
α, MMI
β, MMI
γ
The initial polarity acquiring unit obtains the initial polarity S of power frequency component in each voltage modulus fault transient travelling wave of described transmission line of electricity respectively
α, S
β, S
γ
Comparing unit is with the wave head polarity MMI of described each electric current modulus fault transient travelling wave
α, MMI
β, MMI
γRespectively with the described voltage failure transient state travelling wave of corresponding modulus in the initial polarity of power frequency component compare, and determine the fault direction of described transmission line of electricity according to judged result.
2. transmission line malfunction directional element according to claim 1 is characterized in that, described wave head polarity acquiring unit comprises:
Current sampling unit under the normal operating condition of transmission line of electricity, carries out real-time sampling and storage to the electric current of described transmission line of electricity, and sampling rate is 400kHz, obtains the sampled value sequence of electric current;
The current data processing unit is at first when described transmission line of electricity breaks down, to the three-phase electricity flow valuve i that is gathered
a(n), i
b(n), i
c(n) carry out triumphant human relations Bel conversion, the three-phase current decoupling zero that has an electromagnetic coupled relation is three modulus current i independently
α(n), i
β(n), i
γ(n); Then to described three modulus current i
α(n), i
β(n), i
γ(n) carry out wavelet transformation, try to achieve corresponding wavelet conversion coefficient; Ask for the modulus maximum of described wavelet conversion coefficient at last respectively, and the wave head polarity of coming to determine respectively described current failure transient state travelling wave according to the polarity of described modulus maximum.
3. transmission line malfunction directional element according to claim 1 and 2 is characterized in that, in described wavelet transform process, the derived function that adopts three subcenter B-spline functions is as wavelet function.
4. transmission line malfunction directional element according to claim 3 is characterized in that, the modulus maximum of described wavelet conversion coefficient is: for arbitrary given positive number ε, when | n-n
0| when＜ε satisfies, to n ≠ n arbitrarily
0If,
Set up, then think
Be the modulus maximum of described wavelet conversion coefficient, wherein n is a sampling sequence number, n
0Be the pairing sampling sequence number of modulus maximum,
Be described wavelet conversion coefficient, j represents the yardstick of wavelet transformation.
5. transmission line malfunction directional element according to claim 1 and 2 is characterized in that, comprises in described initial polarity acquiring unit:
The voltage sample unit under the normal operating condition, carries out real-time sampling and storage to the voltage of described transmission line of electricity, and sampling rate is 20kHz, obtains the sampled value sequence of described voltage;
The voltage data processing unit at first when described transmission line malfunction, extracts power frequency component u in each phase voltage fault transient travelling wave of described transmission line of electricity
Fttpa, u
Fttpb, u
FttpcFollow described power frequency component u to being extracted
Fttpa, u
Fttpb, u
FttpcCarry out triumphant human relations Bel conversion, the three-phase voltage decoupling zero that has an electromagnetic coupled relation is three modulus voltage u independently
Fttp α, u
Fttp β, u
Fttp γRespectively the starting stage value of power frequency component in described three modulus current fault transient state travelling waves is sued for peace then; Determine the initial polarity of the power frequency component in the described voltage failure transient state travelling wave at last according to summed result.
6. transmission line malfunction directional element according to claim 5 is characterized in that, the described starting stage began to the time interval of schedule time end for the moment that arrives bus capacitor formula voltage transformer (VT) from described fault transient travelling wave after the described fault.
7. transmission line malfunction directional element according to claim 6 is characterized in that, the described schedule time is 2 milliseconds.
8. transmission line malfunction directional element according to claim 5 is characterized in that, described initial polarity determining unit uses sign function to determine the initial polarity of the power frequency component in the described voltage failure transient state travelling wave.
9. transmission line malfunction directional element according to claim 1, it is characterized in that, the initial polarity of power frequency component is opposite in the wave head polarity of arbitrary modulus of described comparing unit in determining the wave head polarity of described each electric current modulus fault transient travelling wave and the described voltage failure transient state travelling wave of corresponding modulus, and then definite described transmission line malfunction is the forward fault.
10. transmission line malfunction directional element according to claim 1, it is characterized in that, described comparing unit determines that then described transmission line malfunction is a reverse fault when each modulus wave head polarity of determining described current failure transient state travelling wave is all identical with the initial polarity of power frequency component in the described voltage failure transient state travelling wave of corresponding modulus.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102122815A (en) * | 2011-02-28 | 2011-07-13 | 清华大学 | Ultra high-speed traveling wave direction pilot protection method, device and system for high voltage transmission line |
| CN104393581A (en) * | 2014-11-05 | 2015-03-04 | 昆明理工大学 | Triangle looped network transient state quantity unit protection method utilizing voltage and current abrupt change quantity wavelet coefficient correlation analysis |
| WO2017125145A1 (en) * | 2016-01-20 | 2017-07-27 | Abb Schweiz Ag | Fault detection of a transmission line |
| CN109725236A (en) * | 2019-02-26 | 2019-05-07 | 四川轻化工大学 | A kind of bus-bar fault area determination method based on power frequency quantity Polarity comparision |
| CN113447757A (en) * | 2021-05-24 | 2021-09-28 | 南方电网科学研究院有限责任公司 | Traveling wave fault detection method, equipment and medium for high-voltage transmission line |
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2009
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102122815A (en) * | 2011-02-28 | 2011-07-13 | 清华大学 | Ultra high-speed traveling wave direction pilot protection method, device and system for high voltage transmission line |
| CN104393581A (en) * | 2014-11-05 | 2015-03-04 | 昆明理工大学 | Triangle looped network transient state quantity unit protection method utilizing voltage and current abrupt change quantity wavelet coefficient correlation analysis |
| CN104393581B (en) * | 2014-11-05 | 2018-03-06 | 昆明理工大学 | A kind of triangle looped network transient cell protection method using voltage x current Sudden Changing Rate wavelet coefficient correlation analysis |
| WO2017125145A1 (en) * | 2016-01-20 | 2017-07-27 | Abb Schweiz Ag | Fault detection of a transmission line |
| CN108603909A (en) * | 2016-01-20 | 2018-09-28 | Abb瑞士股份有限公司 | The fault detect of transmission line |
| US10295586B2 (en) | 2016-01-20 | 2019-05-21 | Abb Schweiz Ag | Fault detection of a transmission line |
| CN108603909B (en) * | 2016-01-20 | 2021-11-26 | 日立能源瑞士股份公司 | Method and apparatus for detecting a fault of a transmission line in an electric power system |
| CN109725236A (en) * | 2019-02-26 | 2019-05-07 | 四川轻化工大学 | A kind of bus-bar fault area determination method based on power frequency quantity Polarity comparision |
| CN113447757A (en) * | 2021-05-24 | 2021-09-28 | 南方电网科学研究院有限责任公司 | Traveling wave fault detection method, equipment and medium for high-voltage transmission line |
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| CN101710164B (en) | 2011-11-30 |
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