CN109142967A - A kind of change time limit distance protection distance measuring method and device for power network line - Google Patents

A kind of change time limit distance protection distance measuring method and device for power network line Download PDF

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Publication number
CN109142967A
CN109142967A CN201810784885.7A CN201810784885A CN109142967A CN 109142967 A CN109142967 A CN 109142967A CN 201810784885 A CN201810784885 A CN 201810784885A CN 109142967 A CN109142967 A CN 109142967A
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distance protection
value
sections
zdfni
criterion
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CN109142967B (en
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周泽昕
李天华
曹虹
郭雅蓉
杜丁香
王兴国
程琪
王德林
吕鹏飞
刘宇
张志�
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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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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/088—Aspects of digital computing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

The present invention provides a kind of change time limit distance protection distance measuring method and device for power network line, it passes through the reactance line criterion in the case of different faults first, using the definite value of each distance protection section as its initial adjusting impedance value, determine the distance protection section for carrying out subsequent reactance line criterion, then the adjusting impedance value for carrying out the distance protection section reactance next time line criterion is determined according to the calculation formula of determining distance protection section adjusting impedance value, by repeatedly recycling, determine final adjusting impedance value, it is finally determined according to distance calculation formula and becomes the distance between fault point and protection installation place in time limit distance protection.It is of the present invention to become time limit distance protection distance measuring method and device when the failure of power network line occurs in distance protection segment limit for power network line, fault point can be accurately positioned, error is in 1e-3.

Description

A kind of change time limit distance protection distance measuring method and device for power network line
Technical field
The present invention relates to relay protection fields, and more particularly, to a kind of change time limit distance for power network line Protect distance measuring method and device.
Background technique
Adaptive setting and correct definite value are to ensure that protective relaying device is brought into normal play the necessary condition of performance, at present power grid Relay protection setting include route protection, bus protection, tranformer protection, breaker protection, failure protection overvoltage and remote Jump protection etc..Wherein, setting valve of most of protections in capital construction investment is adapted to the variation of power grid part, generally will not frequency Numerous change definite value.And the cooperating apart from back-up protection apart from back-up protection needs and adjacent lines of route protection, in grid line The cut-offfing of road, it is newly-built during, need to recalculate line related definite value, and be issued to related substation's change definite value.It is real On border, the inconsistency of construction project plan and implementation, the definite value for needing to change can't one-time-reach-place, will cause more toward contact Definite value loses cooperation during changing.
Become time limit distance protection and utilizes relevant parameter of the distance protection in route fault actions, such as fault point and guarantor The distance between shield installation place, line voltage distribution and electric current of acquisition etc., in addition relevant information off-line, such as each distance protection section Impedance definite value and line length etc., calculate operation time limit automatically, can be realized adjacent lines distance protection operation time limit oneself Dynamic cooperation.Therefore, in becoming time limit distance protection, accurate the distance between the fault point and protection installation place of measuring is becoming with regard to becoming A key point of protection act calculation of time accuracy is influenced in time limit distance protection.
Summary of the invention
In order to solve the accurate measurement Guangdong power system point of prior art shortage in becoming time limit distance protection and protection peace The technical issues of method and apparatus of distance between dress, the present invention provides a kind of change time limit distances for power network line Protect distance measuring method and device.Change time limit distance protection distance measuring method of the present invention for power network line includes:
Determine that line fault is single-phase fault or phase-to phase fault；
When line fault is single-phase fault, according to faulted phase voltageFaulted phase currentAdjust impedance value ZZDFNi(1)And zero-sequence current i0It determines whether the m-i distance protection section since i sections of distance protection meets respectively to have been established Earthing reactance line criterion F1i(1)With null sequence reactor criterion F2i(1), and if only if the m-i since i sections of distance protection away from All meet respective established earthing reactance line criterion F1 from protection sectioni(1)With null sequence reactor criterion F2i(1)When, it is opened from j=2 Begin, according to i sections of distance protection established earthing reactance line criterion F1i(j)With null sequence reactor criterion F2i(j), i sections of distance protection Definite value ZZDiAnd -1 adjusting impedance value Z of jthZDFNi(j-1)Calculate the adjusting impedance value Z of distance protection i sections of jth timeZDFNi(j), Wherein, 1≤i < m, 2≤j < n, m are the natural number greater than 3, and n is the natural number greater than 10；
When line fault is phase-to phase fault, according to failure voltage between phasesFailure three-phase currentIt is hindered with adjusting Anti- value ZZDFNi(1)Determine whether the m-i distance protection section since i sections of distance protection meets respective established alternate reactance Line criterion F3i(1), all meet and if only if the m-i distance protection section since i sections of distance protection respectively established alternate Reactance line criterion F3i(1)When, since j=2, according to i sections of distance protection established alternate reactance line criterion F3i(j), distance protect The definite value Z of i sections of shieldZDiWith -1 adjusting impedance value Z of jthZDFNi(j-1)Calculate the adjusting impedance value of distance protection i sections of jth time ZZDFNi(j), wherein 1≤i < m, 2≤j < n, m are the natural number greater than 3, and n is the natural number greater than 10；
According to one sub-value B of impedance, the voltage transformer no-load voltage ratio N of pre-set every kilometer of installation place of protectionpt, Current Mutual Inductance Device no-load voltage ratio NctAnd the adjusting impedance value Z of i sections of the distance protection as j=n-1ZDFNi(n-1)Calculate line fault point and protection peace Distance C at dress.
Further, determining that line fault includes: before being single-phase fault or phase-to phase fault
Acquisition becomes the instantaneous value of two sub-value of three-phase voltage and electric current of time limit distance protection installation place；
Three-phase voltage fundamental phasors value is determined according to the instantaneous value of two sub-value of the three-phase voltage of the acquisition and electric currentWith current first harmonics phasor value
According to the current first harmonics phasor value for becoming time limit distance protection installation placeCalculate zero-sequence current
The respective definite value Z of m-1 distance protection section of installation place will be protectedZDiImpedance value Z is adjusted respectively as itZDFNi(j) Value in j=1, wherein 1≤i < m, m are the natural number greater than 3；
One sub-value B of impedance, the voltage transformer no-load voltage ratio N of every kilometer of installation place of protection are setptWith current transformer ratio Nct Value；
The earthing reactance line criterion, null sequence reactor criterion and alternate reactance line criterion of each distance protection section are established, In:
The formula of earthing reactance line criterion are as follows:
The formula of null sequence reactor criterion are as follows:
The formula of alternate reactance line criterion are as follows:
In formula, K is pre-set zero-utility theory,It is faulted phase voltage, value is the voltage fundamental of failure phase Phasor value,It is failure voltage between phases, value is the difference of the alternate voltage fundamental phasor value of failure,It is faulted phase current, Its value is the current first harmonics phasor value of failure phase,It is failure three-phase current, value is the alternate current first harmonics phasor of failure The difference of value,It is zero-sequence current, ZZDFNi(j)It is the adjusting impedance of distance protection i sections of jth time, wherein 1≤i < m, 2≤j < n, m are Natural number greater than 3, n are the natural number greater than 10.
Further, when line fault is single-phase fault, according to faulted phase voltageFaulted phase currentAdjusting resistance Anti- value ZZDFNi(1)And zero-sequence currentDetermine whether the m-i distance protection section since i sections of distance protection meets respectively self The earthing reactance line criterion F1 of foundationi(1)With null sequence reactor criterion F2i(1), and if only if the m-i since i sections of distance protection A distance protection section all meets respective established earthing reactance line criterion F1i(1)With null sequence reactor criterion F2i(1)When, from j= 2 start, according to i sections of distance protection established earthing reactance line criterion F1i(j)With null sequence reactor criterion F2i(j), distance protection I sections of definite value ZZDiAnd -1 adjusting impedance value Z of jthZDFNi(j-1)Calculate the adjusting impedance value of distance protection i sections of jth time ZZDFNi(j)Include:
By faulted phase voltageFaulted phase currentAnd the adjusting impedance value Z determinedZDFNi(1)And zero-sequence currentPoint Not Dai Ru earthing reactance line criterion formula F 1i(1)With the formula F 2 of null sequence reactor criterioni(1), when not being from i sections of distance protection M-i distance protection section of beginning is all satisfied 90 °≤F1i(1)≤ 270 ° and 90 °≤F2i(1)At≤270 °, ranging terminates；
When the m-i distance protection section since i sections of distance protection is all satisfied 90 °≤F1i(1)≤ 270 ° and 90 °≤F2i(1) At≤270 °, since j=2, according to i sections of distance protection established earthing reactance line criterion F1i(j)Sentence with null sequence reactor According to F2i(j), i sections of distance protection of definite value ZZDiAnd -1 adjusting impedance value Z of jthZDFNi(j-1)Calculate distance protection i sections of jth time Adjusting impedance value ZZDFNi(j), formula are as follows:
As 90 °≤F1 of i sections of distance protection satisfactionsi(j-1)≤ 270 ° and 90 °≤F2i(j-1)At≤270 °,
ZZDFNi(j)=ZZDFNi(j-1)-0.5j-1*ZZDi
90 °≤F1 is unsatisfactory for when i sections of distance protectioni(j-1)≤ 270 ° or 90 °≤F2i(j-1)At≤270 °,
ZZDFNi(j)=ZZDFNi(j-1)+0.5j-1*ZZDi
In formula, 1≤i < m, 2≤j < n, m are the natural number greater than 3, and n is the natural number greater than 10.
Further, when line fault is phase-to phase fault, according to failure voltage between phasesFailure three-phase current With adjusting impedance value ZZDFNi(1)It is respectively established to determine whether the m-i distance protection section since i sections of distance protection meets Alternate reactance line criterion F3i(1), all meet and if only if the m-i distance protection section since i sections of distance protection respectively built Vertical alternate reactance line criterion F3i(1)When, since j=2, according to i sections of distance protection established alternate reactance line criterions F3i(j), i sections of distance protection of definite value ZZDiWith -1 adjusting impedance value Z of jthZDFNi(j-1)Calculate the whole of distance protection i sections of jth time Constant impedance value ZZDFNi(j)Include:
By failure voltage between phasesFailure three-phase currentWith adjusting impedance value ZZDFNi(1)Alternate reactance is substituted into respectively Line criterion F3i(1), when not being that m-i distance protection section since i sections of distance protection is all satisfied 90 °≤F3i(1)≤ 270 ° and 90°≤F3i(1)At≤270 °, ranging terminates；
When the m-i distance protection section since i sections of distance protection is all satisfied 90 °≤F3i(1)At≤270 °, opened from j=2 Begin, according to i sections of distance protection established alternate reactance line criterion F3i(j)I sections of distance protection of definite value ZZDiAnd jth -1 time Adjust impedance value ZZDFNi(j-1)Calculate the adjusting impedance value Z of distance protection i sections of jth timeZDFNi(j), formula are as follows:
As 90 °≤F3 of i sections of distance protection satisfactionsi(j-1)At≤270 °,
ZZDFNi(j)=ZZDFNi(j-1)-0.5j-1*ZZDi
90 °≤F3 is unsatisfactory for when i sections of distance protectioni(j-1)At≤270 °,
ZZDFNi(j)=ZZDFNi(j-1)+0.5j-1*ZZDi
In formula, 1≤i < m, 2≤j < n, m are the natural number greater than 3, and n is the natural number greater than 10.
Further, according to the one sub-value B of impedance of pre-set every kilometer of installation place of protection, voltage transformer no-load voltage ratio Npt, current transformer ratio NctAnd the adjusting impedance value Z of i sections of the distance protection as j=n-1ZDFNi(n-1)Calculate route event The formula of barrier point and the distance C of protection installation place are as follows:
C=(ZZDFNi(n-1)×(Npt/Nct))/B
In formula, B is the setting value of one sub-value of impedance of every kilometer of installation place of protection, NptIt is voltage transformer no-load voltage ratio, NctIt is Current transformer ratio, ZZDFNi(n-1)It is i sections of the distance protection adjusting impedance value Z in j=n-1ZDFNi(n-1)。
According to another aspect of the present invention, the present invention provides a kind of change time limit distance protection ranging dress for power network line It sets, described device includes:
Fault type determination unit is used to determine that line fault to be single-phase fault or phase-to phase fault；
Third computing unit is used for when line fault is single-phase fault, according to faulted phase voltageFailure is mutually electric StreamAdjust impedance value ZZDFNi(1)And zero-sequence currentDetermining the m-i distance protection section since i sections of distance protection is It is no to meet respectively established earthing reactance line criterion F1i(1)With null sequence reactor criterion F2i(1), and if only if from distance protection i The m-i distance protection section that section starts all meets respective established earthing reactance line criterion F1i(1)With null sequence reactor criterion F2i(1)When, since j=2, according to i sections of distance protection established earthing reactance line criterion F1i(j)With null sequence reactor criterion F2i(j), i sections of distance protection of definite value ZZDiAnd -1 adjusting impedance value Z of jthZDFNi(j-1)Calculate distance protection i sections of jth time Adjust impedance value ZZDFNi(j), wherein 1≤i < m, 2≤j < n, m are the natural number greater than 3, and n is the natural number greater than 10；
4th computing unit is used for when line fault is phase-to phase fault, according to failure voltage between phasesFailure phase Between electric currentWith adjusting impedance value ZZDFNi(1)Determine whether the m-i distance protection section since i sections of distance protection meets respectively From established alternate reactance line criterion F3i(1), and if only if the m-i distance protection Duan Douman since i sections of distance protection The respective established alternate reactance line criterion F3 of footi(1)When, since j=2, according to i sections of distance protection established alternate electricity Anti- line criterion F3i(j), i sections of distance protection of definite value ZZDiWith -1 adjusting impedance value Z of jthZDFNi(j-1)Calculate distance protection i section the J adjusting impedance value ZZDFNi(j), wherein 1≤i < m, 2≤j < n, m are the natural number greater than 3, and n is the natural number greater than 10；
5th computing unit is used for mutual according to one sub-value B of impedance, the voltage of pre-set every kilometer of installation place of protection Sensor no-load voltage ratio Npt, current transformer ratio NctAnd the adjusting impedance value Z of i sections of the distance protection as j=n-1ZDFNi(n-1)Meter It calculates line fault point and protects the distance C of installation place.
Further, described device further include:
Data acquisition unit is used to acquire the wink for becoming two sub-value of three-phase voltage and electric current of time limit distance protection installation place Duration；
First computing unit is used to determine three-phase according to the instantaneous value of two sub-value of three-phase voltage and electric current of the acquisition Voltage fundamental phasor valueWith current first harmonics phasor valueAnd according to change time limit distance protection Two sub-value of current first harmonics phasor of installation placeCalculate zero-sequence current
Second computing unit is used to protect the respective definite value Z of m-1 distance protection section of installation placeZDiRespectively as It adjusts impedance value ZZDFNi(j)Value in j=1, wherein 1≤i < m, m are the natural number greater than 3；
Parameter set unit is used to be arranged one sub-value B of impedance, the voltage transformer no-load voltage ratio N of every kilometer of installation place of protectionpt With current transformer ratio NctValue, and establish earthing reactance line criterion, the null sequence reactor criterion of each distance protection section With alternate reactance line criterion, in which:
The formula of earthing reactance line criterion are as follows:
The formula of null sequence reactor criterion are as follows:
The formula of alternate reactance line criterion are as follows:
In formula, K is pre-set zero-utility theory,It is faulted phase voltage, value is the voltage fundamental of failure phase Phasor value,It is failure voltage between phases, value is the difference of the alternate voltage fundamental phasor value of failure,It is faulted phase current, Its value is the current first harmonics phasor value of failure phase,It is failure three-phase current, value is the alternate current first harmonics phasor of failure The difference of value,It is zero-sequence current, ZZDFNi(j)It is the adjusting impedance of distance protection i sections of jth time, wherein 1≤i < m, 2≤j < n, m For the natural number greater than 3, n is the natural number greater than 10.
Further, the third computing unit is when line fault is single-phase fault, according to faulted phase voltageTherefore Hinder phase currentAdjust impedance value ZZDFNi(1)And zero-sequence currentDetermine that the m-i distance since i sections of distance protection is protected Whether shield section meets respective established earthing reactance line criterion F1i(1)With null sequence reactor criterion F2i(1), and if only if from away from M-i distance protection section of i sections from protection beginnings all meets respective established earthing reactance line criterion F1i(1)And zero-sequence reactance Line criterion F2i(1)When, since j=2, according to i sections of distance protection established earthing reactance line criterion F1i(j)And zero-sequence reactance Line criterion F2i(j), i sections of distance protection of definite value ZZDiAnd -1 adjusting impedance value Z of jthZDFNi(j-1)Calculate distance protection i section the J adjusting impedance value ZZDFNi(j)Include:
By faulted phase voltageFaulted phase currentAnd the adjusting impedance value Z determinedZDFNi(1)And zero-sequence currentPoint Not Dai Ru earthing reactance line criterion formula F 1i(1)With the formula F 2 of null sequence reactor criterioni(1), when not being from i sections of distance protection M-i distance protection section of beginning is all satisfied 90 °≤F1i(1)≤ 270 ° and 90 °≤F2i(1)At≤270 °, ranging terminates；
When the m-i distance protection section since i sections of distance protection is all satisfied 90 °≤F1i(1)≤ 270 ° and 90 °≤F2i(1) At≤270 °, since j=2, according to i sections of distance protection established earthing reactance line criterion F1i(j)Sentence with null sequence reactor According to F2i(j), i sections of distance protection of definite value ZZDiAnd -1 adjusting impedance value Z of jthZDFNi(j-1)Calculate distance protection j sections of jth time Adjusting impedance value ZZDFNi(j), formula are as follows:
As 90 °≤F1 of i sections of distance protection satisfactionsi(j-1)≤ 270 ° and 90 °≤F2i(j-1)At≤270 °,
ZZDFNi(j)=ZZDFNi(j-1)-0.5j-1*ZZDi
90 °≤F1 is unsatisfactory for when i sections of distance protectioni(j-1)≤ 270 ° or 90 °≤F2i(j-1)At≤270 °,
ZZDFNi(j)=ZZDFNi(j-1)+0.5j-1*ZZDi
In formula, 1≤i < m, 2≤j < n, m are the natural number greater than 3, and n is the natural number greater than 10.
Further, the 4th computing unit is phase-to phase fault in line fault, according to failure voltage between phasesTherefore Hinder three-phase currentWith adjusting impedance value ZZDFNi(1)Determine whether the m-i distance protection section since i sections of distance protection be full The respective established alternate reactance line criterion F3 of footi(1), and if only if the m-i distance protection section since i sections of distance protection All meet respectively established alternate reactance line criterion F3i(1)When, since j=2, according to i sections of established phases of distance protection Between reactance line criterion F3i(j), i sections of distance protection of definite value ZZDiWith -1 adjusting impedance value Z of jthZDFNi(j-1)Calculate distance protection i The adjusting impedance value Z of section jth timeZDFNi(j)Include:
By failure voltage between phasesFailure three-phase currentWith adjusting impedance value ZZDFNi(1)Alternate reactance is substituted into respectively Line criterion F3i(1), when not being that m-i distance protection section since i sections of distance protection is all satisfied 90 °≤F3i(1)≤ 270 ° and 90°≤F3i(1)At≤270 °, ranging terminates；
When the m-i distance protection section since i sections of distance protection is all satisfied 90 °≤F3i(1)At≤270 °, opened from j=2 Begin, according to i sections of distance protection established alternate reactance line criterion F3i(j)I sections of distance protection of definite value ZZDiAnd jth -1 time Adjust impedance value ZZDFNi(j-1)Calculate the adjusting impedance value Z of distance protection i sections of jth timeZDFNi(j), formula are as follows:
As 90 °≤F3 of i sections of distance protection satisfactionsi(j-1)At≤270 °,
ZZDFNi(j)=ZZDFNi(j-1)-0.5j-1*ZZDi
90 °≤F3 is unsatisfactory for when i sections of distance protectioni(j-1)At≤270 °,
ZZDFNi(j)=ZZDFNi(j-1)+0.5j-1*ZZDi
In formula, 1≤i < m, 2≤j < n, m are the natural number greater than 3, and n is the natural number greater than 10.
Further, the 5th computing unit according to it is pre-set protection every kilometer of installation place one sub-value B of impedance, Voltage transformer no-load voltage ratio Npt, current transformer ratio NctAnd the adjusting impedance value of i sections of the distance protection as j=n-1 ZZDFNi(n-1)It calculates line fault point and protects the formula of the distance C of installation place are as follows:
C=(ZZDFNi(n-1)×(Npt/Nct))/B
In formula, B is the setting value of one sub-value of impedance of every kilometer of installation place of protection, NptIt is voltage transformer no-load voltage ratio, NctIt is Current transformer ratio, ZZDFNi(n-1)It is i sections of the distance protection adjusting impedance value Z in j=n-1ZDFNi(n-1)。
The change time limit distance protection distance measuring method and device for power network line that technical solution of the present invention provides are logical first The reactance line criterion in the case of different faults is crossed, using the definite value of each distance protection section as its initial adjusting impedance value, is determined The distance protection section of subsequent reactance line criterion is carried out, then the calculation formula according to determining distance protection section adjusting impedance value is true Surely the adjusting impedance value for carrying out the distance protection section reactance next time line criterion determines final adjusting impedance by repeatedly recycling Value finally determines according to distance calculation formula and becomes the distance between fault point and protection installation place in time limit distance protection.This hair Bright become time limit distance protection distance measuring method and the device for power network line occurs in the failure of power network line in distance When protecting in segment limit, fault point can be accurately positioned, error is in 1e-3.
Detailed description of the invention
By reference to the following drawings, exemplary embodiments of the present invention can be more fully understood by:
Fig. 1 is the stream according to the change time limit distance protection distance measuring method for power network line of the preferred embodiment for the present invention Cheng Tu；
Fig. 2 is the knot according to the change time limit distance protection range unit for power network line of the preferred embodiment for the present invention Structure schematic diagram；
Fig. 3 is the change time limit distance protection ranging side for power network line according to presently preferred embodiment The flow chart of method.
Specific embodiment
Exemplary embodiments of the present invention are introduced referring now to the drawings, however, the present invention can use many different shapes Formula is implemented, and is not limited to the embodiment described herein, and to provide these embodiments be at large and fully disclose The present invention, and the scope of the present invention is sufficiently conveyed to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements use identical attached Icon note.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has person of ordinary skill in the field It is common to understand meaning.Further it will be understood that with the term that usually used dictionary limits, should be understood as and its The context of related fields has consistent meaning, and is not construed as Utopian or too formal meaning.
Embodiment one
Fig. 1 is the stream according to the change time limit distance protection distance measuring method for power network line of the preferred embodiment for the present invention Cheng Tu.As shown in Figure 1, the change time limit distance protection distance measuring method 100 of the present invention for power network line is opened from step 101 Begin.
In step 101, acquisition becomes the instantaneous value of two sub-value of three-phase voltage and electric current of time limit distance protection installation place.
In step 102, three-phase voltage fundamental wave is determined according to the instantaneous value of two sub-value of the three-phase voltage of the acquisition and electric current Phasor valueWith current first harmonics phasor valueAnd according to change time limit distance protection installation place Two sub-value of current first harmonics phasorCalculate zero-sequence currentWherein, the three-phase voltage fundamental phasors value and three-phase Current first harmonics phasor value is to be calculated by the instantaneous value of two sub-value of three-phase voltage and electric current to acquisition using fourier algorithm It arrives.Calculate zero-sequence currentFormula are as follows:
In step 103, the respective definite value Z of m-1 distance protection section of installation place will be protectedZDiRespectively as its adjusting resistance Anti- value ZZDFNi(j)Value in j=1, wherein 1≤i < m, m are the natural number greater than 3；
In step 104, one sub-value B of impedance, the voltage transformer no-load voltage ratio N of every kilometer of installation place of setting protectionptIt is mutual with electric current Sensor no-load voltage ratio NctValue, and establish earthing reactance line criterion, null sequence reactor criterion and the alternate electricity of each distance protection section Anti- line criterion, in which:
The formula of earthing reactance line criterion are as follows:
The formula of null sequence reactor criterion are as follows:
The formula of alternate reactance line criterion are as follows:
In formula, K is pre-set zero-utility theory,It is faulted phase voltage, value is the voltage fundamental of failure phase Phasor value,It is failure voltage between phases, value is the difference of the alternate voltage fundamental phasor value of failure,It is faulted phase current, Its value is the current first harmonics phasor value of failure phase,It is failure three-phase current, value is the alternate current first harmonics phasor of failure The difference of value,It is zero-sequence current, ZZDFNi(j)It is the adjusting impedance of distance protection i sections of jth time, wherein 1≤i < m, 2≤j < n, m For the natural number greater than 3, n is the natural number greater than 10；
In step 105, determine that line fault is single-phase fault or phase-to phase fault；
In step 106, when line fault is single-phase fault, according to faulted phase voltageFaulted phase currentAdjusting Impedance value ZZDFNi(1)And zero-sequence currentDetermine whether the m-i distance protection section since i sections of distance protection meets respectively Established earthing reactance line criterion F1i(1)With null sequence reactor criterion F2i(1), and if only if the m- since i sections of distance protection I distance protection section all meets respective established earthing reactance line criterion F1i(1)With null sequence reactor criterion F2i(1)When, from j =2 start, according to i sections of distance protection established earthing reactance line criterion F1i(j)With null sequence reactor criterion F2i(j), distance protect The definite value Z of i sections of shieldZDiAnd -1 adjusting impedance value Z of jthZDFNi(j-1)Calculate the adjusting impedance value of distance protection i sections of jth time ZZDFNi(j), wherein 1≤i < m, 2≤j < n, m are the natural number greater than 3, and n is the natural number greater than 10；
In step 107, when line fault is phase-to phase fault, according to failure voltage between phasesFailure three-phase current With adjusting impedance value ZZDFNi(1)It is respectively established to determine whether the m-i distance protection section since i sections of distance protection meets Alternate reactance line criterion F3i(1), all meet and if only if the m-i distance protection section since i sections of distance protection respectively built Vertical alternate reactance line criterion F3i(1)When, since j=2, according to i sections of distance protection established alternate reactance line criterions F3i(j), i sections of distance protection of definite value ZZDiWith -1 adjusting impedance value Z of jthZDFNi(j-1)Calculate the whole of distance protection i sections of jth time Constant impedance value ZZDFNi(j), wherein 1≤i < m, 2≤j < n, m are the natural number greater than 3, and n is the natural number greater than 10；
In step 108, according to the one sub-value B of impedance of pre-set every kilometer of installation place of protection, voltage transformer no-load voltage ratio Npt, current transformer ratio NctAnd the adjusting impedance value Z of i sections of the distance protection as j=n-1ZDFNi(n-1)Calculate route event The distance C of barrier point and protection installation place.
Preferably, when line fault is single-phase fault, according to faulted phase voltageFaulted phase currentAdjust impedance Value ZZDFNi(1)And zero-sequence currentIt is respectively built to determine whether the m-i distance protection section since i sections of distance protection meets Vertical earthing reactance line criterion F1i(1)With null sequence reactor criterion F2i(1), and if only if m-i since i sections of distance protection Distance protection section all meets respective established earthing reactance line criterion F1i(1)With null sequence reactor criterion F2i(1)When, from j=2 Start, according to i sections of distance protection established earthing reactance line criterion F1i(j)With null sequence reactor criterion F2i(j), distance protection i The definite value Z of sectionZDiAnd -1 adjusting impedance value Z of jthZDFNi(j-1)Calculate the adjusting impedance value of distance protection i sections of jth time ZZDFNi(j)Include:
By faulted phase voltageFaulted phase currentAnd the adjusting impedance value Z determinedZDFNi(1)And zero-sequence currentPoint Not Dai Ru earthing reactance line criterion formula F 1i(1)With the formula F 2 of null sequence reactor criterioni(1), when not being from i sections of distance protection M-i distance protection section of beginning is all satisfied 90 °≤F1i(1)≤ 270 ° and 90 °≤F2i(1)At≤270 °, ranging terminates；
When the m-i distance protection section since i sections of distance protection is all satisfied 90 °≤F1i(1)≤ 270 ° and 90 °≤F2i(1) At≤270 °, since j=2, according to i sections of distance protection established earthing reactance line criterion F1i(j)Sentence with null sequence reactor According to F2i(j), i sections of distance protection of definite value ZZDiAnd -1 adjusting impedance value Z of jthZDFNi(j-1)Calculate distance protection i sections of jth time Adjusting impedance value ZZDFNi(j)Formula are as follows:
As 90 °≤F1 of i sections of distance protection satisfactionsi(j-1)≤ 270 ° and 90 °≤F2i(j-1)At≤270 °,
ZZDFNi(j)=ZZDFNi(j-1)-0.5j-1*ZZDi
90 °≤F1 is unsatisfactory for when i sections of distance protectioni(j-1)≤ 270 ° or 90 °≤F2i(j-1)At≤270 °,
ZZDFNi(j)=ZZDFNi(j-1)+0.5j-1*ZZDi
In formula, 1≤i < m, 2≤j < n, m are the natural number greater than 3, and n is the natural number greater than 10.
Preferably, when line fault is phase-to phase fault, according to failure voltage between phasesFailure three-phase currentWith Adjust impedance value ZZDFNi(1)Determine whether the m-i distance protection section since i sections of distance protection meets respective established phase Between reactance line criterion F3i(1), all meet and if only if the m-i distance protection section since i sections of distance protection and respectively have been established Alternate reactance line criterion F3i(1)When, since j=2, according to i sections of distance protection established alternate reactance line criterion F3i(j)、 I sections of distance protection of definite value ZZDiWith -1 adjusting impedance value Z of jthZDFNi(j-1)Calculate the adjusting impedance of distance protection i sections of jth time Value ZZDFNi(j)Include:
By failure voltage between phasesFailure three-phase currentWith adjusting impedance value ZZDFNi(1)Alternate reactance is substituted into respectively Line criterion F3i(1), when not being that m-i distance protection section since i sections of distance protection is all satisfied 90 °≤F3i(1)≤ 270 ° and 90°≤F3i(1)At≤270 °, ranging terminates；
When the m-i distance protection section since i sections of distance protection is all satisfied 90 °≤F3i(1)At≤270 °, opened from j=2 Begin, according to i sections of distance protection established alternate reactance line criterion F3i(j)I sections of distance protection of definite value ZZDiAnd jth -1 time Adjust impedance value ZZDFNi(j-1)Calculate the adjusting impedance value Z of distance protection i sections of jth timeZDFNi(j)Formula are as follows:
As 90 °≤F3 of i sections of distance protection satisfactionsi(j-1)At≤270 °,
ZZDFNi(j)=ZZDFNi(j-1)-0.5j-1*ZZDi
90 °≤F3 is unsatisfactory for when i sections of distance protectioni(j-1)At≤270 °,
ZZDFNi(j)=ZZDFNi(j-1)+0.5j-1*ZZDi
In formula, 1≤i < m, 2≤j < n, m are the natural number greater than 3, and n is the natural number greater than 10.
Preferably, according to one sub-value B of impedance, the voltage transformer no-load voltage ratio N of pre-set every kilometer of installation place of protectionpt、 Current transformer ratio NctAnd the adjusting impedance value Z of i sections of the distance protection as j=n-1ZDFNi(n-1)Calculate line fault point With the formula of the distance C of protection installation place are as follows:
C=(ZZDFNi(n-1)×(Npt/Nct))/B
In formula, B is the setting value of one sub-value of impedance of every kilometer of installation place of protection, NptIt is voltage transformer no-load voltage ratio, NctIt is Current transformer ratio, ZZDFNi(n-1)It is i sections of the distance protection adjusting impedance value Z in j=n-1ZDFNi(n-1)。
Fig. 2 is the knot according to the change time limit distance protection range unit for power network line of the preferred embodiment for the present invention Structure schematic diagram.As shown in Fig. 2, the change time limit distance protection range unit 200 of the present invention for power network line includes:
Data acquisition unit 201 is used to acquire two sub-value of three-phase voltage and electric current for becoming time limit distance protection installation place Instantaneous value.
First computing unit 202 is used to be determined according to the instantaneous value of two sub-value of three-phase voltage and electric current of the acquisition Three-phase voltage fundamental phasors valueWith current first harmonics phasor valueAnd according to change time limit distance Protect two sub-value of current first harmonics phasor of installation placeCalculate zero-sequence currentWherein, the three-phase voltage fundamental wave Phasor value and three-phase current fundamental phasors value are the instantaneous values by two sub-value of three-phase voltage and electric current to acquisition using Fourier Leaf algorithm is calculated.Calculate zero-sequence currentFormula are as follows:
Second computing unit 203 is used to protect the respective definite value Z of m-1 distance protection section of installation placeZDiRespectively Impedance value Z is adjusted as itZDFNi(j)Value in j=1, wherein 1≤i < m, m are the natural number greater than 3.
Parameter set unit 204 is used to be arranged the one sub-value B of impedance of every kilometer of installation place of protection, voltage transformer becomes Compare NptWith current transformer ratio NctValue, and establish the earthing reactance line criterion of each distance protection section, null sequence reactor Criterion and alternate reactance line criterion, in which:
The formula of earthing reactance line criterion are as follows:
The formula of null sequence reactor criterion are as follows:
The formula of alternate reactance line criterion are as follows:
In formula, K is pre-set zero-utility theory,It is faulted phase voltage, value is the voltage fundamental of failure phase Phasor value,It is failure voltage between phases, value is the difference of the alternate voltage fundamental phasor value of failure,It is faulted phase current, Its value is the current first harmonics phasor value of failure phase,It is failure three-phase current, value is the alternate current first harmonics phasor value of failure Difference, be failure voltage between phases, be faulted phase current, be failure three-phase current,It is zero-sequence current, ZZDFNi(i)It is distance protection The adjusting impedance of i sections of i-ths, wherein 1≤i < m, 2≤i < n, m are the natural number greater than 3, n is the natural number greater than 10.
Fault type determination unit 205 is used to determine that line fault to be single-phase fault or phase-to phase fault；
Third computing unit 206 is used for when line fault is single-phase fault, according to faulted phase voltageFailure phase Electric currentAdjust impedance value ZZDFNi(1)And zero-sequence currentDetermine the m-i distance protection section since i sections of distance protection Whether respective established earthing reactance line criterion F1 is meti(1)With null sequence reactor criterion F2i(1), protected and if only if from distance M-i distance protection section of i sections of beginnings of shield all meets respective established earthing reactance line criterion F1i(1)Sentence with null sequence reactor According to F2i(1)When, since j=2, according to i sections of distance protection established earthing reactance line criterion F1i(j)Sentence with null sequence reactor According to F2i(j), i sections of distance protection of definite value ZZDiAnd -1 adjusting impedance value Z of jthZDFNi(j-1)Calculate distance protection i sections of jth time Adjusting impedance value ZZDFNi(j), wherein 1≤i < m, 2≤j < n, m are the natural number greater than 3, and n is the natural number greater than 10；
4th computing unit 207 is used for when line fault is phase-to phase fault, according to failure voltage between phasesTherefore Hinder three-phase currentWith adjusting impedance value ZZDFNi(1)Determine whether the m-i distance protection section since i sections of distance protection be full The respective established alternate reactance line criterion F3 of footi(1), and if only if the m-i distance protection section since i sections of distance protection All meet respectively established alternate reactance line criterion F3i(1)When, since j=2, according to i sections of established phases of distance protection Between reactance line criterion F3i(j), i sections of distance protection of definite value ZZDiWith -1 adjusting impedance value Z of jthZDFNi(j-1)Calculate distance protection i The adjusting impedance value Z of section jth timeZDFNi(j), wherein 1≤i < m, 2≤j < n, m are the natural number greater than 3, and n is oneself greater than 10 So number；
5th computing unit 208 is used for one sub-value B of impedance, electricity according to pre-set every kilometer of installation place of protection Press mutual inductor ratio Npt, current transformer ratio NctAnd the adjusting impedance value of i sections of the distance protection as j=n-1 ZZDFNi(n-1)It calculates line fault point and protects the distance C of installation place.
Preferably, the third computing unit 206 is when line fault is single-phase fault, according to faulted phase voltageTherefore Hinder phase currentAdjust impedance value ZZDFNi(1)And zero-sequence current i0Determine the m-i distance protection since i sections of distance protection Whether section meets respective established earthing reactance line criterion F1i(1)With null sequence reactor criterion F2i(1), and if only if from distance M-i distance protection section of i sections of beginnings of protection all meets respective established earthing reactance line criterion F1i(1)And null sequence reactor Criterion F2i(1)When, since j=2, according to i sections of distance protection established earthing reactance line criterion F1i(j)And null sequence reactor Criterion F2i(j), i sections of distance protection of definite value ZZDiAnd -1 adjusting impedance value Z of jthZDFNi(j-1)Calculate distance protection i sections of jth Secondary adjusting impedance value ZZDFNi(j)Include:
By faulted phase voltageFaulted phase currentAnd the adjusting impedance value Z determinedZDFNi(1)And zero-sequence currentPoint Not Dai Ru earthing reactance line criterion formula F 1i(1)With the formula F 2 of null sequence reactor criterioni(1), when not being from i sections of distance protection M-i distance protection section of beginning is all satisfied 90 °≤F1i(1)≤ 270 ° and 90 °≤F2i(1)At≤270 °, ranging terminates；
When the m-i distance protection section since i sections of distance protection is all satisfied 90 °≤F1i(1)≤ 270 ° and 90 °≤F2i(1) At≤270 °, since j=2, according to i sections of distance protection established earthing reactance line criterion F1i(j)Sentence with null sequence reactor According to F2i(j), i sections of distance protection of definite value ZZDiAnd -1 adjusting impedance value Z of jthZDFNi(j-1)Calculate distance protection i sections of jth time Adjusting impedance value ZZDFNi(j)Formula are as follows:
As 90 °≤F1 of i sections of distance protection satisfactionsi(j-1)≤ 270 ° and 90 °≤F2i(j-1)At≤270 °,
ZZDFNi(j)=ZZDFNi(j-1)-0.5j-1*ZZDi
90 °≤F1 is unsatisfactory for when i sections of distance protectioni(j-1)≤ 270 ° or 90 °≤F2i(j-1)At≤270 °,
ZZDFNi(j)=ZZDFNi(j-1)+0.5j-1*ZZDi
In formula, 1≤i < m, 2≤j < n, m are the natural number greater than 3, and n is the natural number greater than 10.
Preferably, the 4th computing unit 207 is phase-to phase fault in line fault, according to failure voltage between phases Failure three-phase currentWith adjusting impedance value ZZDFNi(1)Whether the determining m-i distance protection section since i sections of distance protection Meet respectively established alternate reactance line criterion F3i(1), and if only if the m-i distance protection since i sections of distance protection Section all meets respectively established alternate reactance line criterion F3i(1)When, it is established according to i sections of distance protection since j=2 Alternate reactance line criterion F3i(j), i sections of distance protection of definite value ZZDiWith -1 adjusting impedance value Z of jthZDFNi(j-1)Distance is calculated to protect The adjusting impedance value Z of shield i sections of jth timeZDFNi(j)Include:
By failure voltage between phasesFailure three-phase currentWith adjusting impedance value ZZDFNi(1)Alternate reactance is substituted into respectively Line criterion F3i(1), when not being that m-i distance protection section since i sections of distance protection is all satisfied 90 °≤F3i(1)≤ 270 ° and 90°≤F3i(1)At≤270 °, ranging terminates；
When the m-i distance protection section since i sections of distance protection is all satisfied 90 °≤F3i(1)At≤270 °, opened from j=2 Begin, according to i sections of distance protection established alternate reactance line criterion F3i(j)I sections of distance protection of definite value ZZDiAnd jth -1 time Adjust impedance value ZZDFNi(j-1)Calculate the adjusting impedance value Z of distance protection i sections of jth timeZDFNi(j)Formula are as follows:
As 90 °≤F3 of i sections of distance protection satisfactionsi(j-1)At≤270 °,
ZZDFNi(j)=ZZDFNi(j-1)-0.5j-1*ZZDi
90 °≤F3 is unsatisfactory for when i sections of distance protectioni(j-1)At≤270 °,
ZZDFNi(j)=ZZDFNi(j-1)+0.5j-1*ZZDi
In formula, 1≤i < m, 2≤j < n, m are the natural number greater than 3, and n is the natural number greater than 10.
Preferably, the 5th computing unit 208 is according to pre-set one sub-value of impedance for protecting every kilometer of installation place B, voltage transformer no-load voltage ratio Npt, current transformer ratio NctAnd the adjusting impedance value of i sections of the distance protection as j=n-1 ZZDFNi(n-1)It calculates line fault point and protects the formula of the distance C of installation place are as follows:
C=(ZZDFNi(n-1)×(Npt/Nct))/B
In formula, B is the setting value of one sub-value of impedance of every kilometer of installation place of protection, NptIt is voltage transformer no-load voltage ratio, NctIt is Current transformer ratio, ZZDFNi(n-1)It is i sections of the distance protection adjusting impedance value Z in j=n-1ZDFNi(n-1)。
Embodiment two
Fig. 3 is the change time limit distance protection ranging side for power network line according to presently preferred embodiment The flow chart of method.In the preferred embodiment, 3 distance protection sections are shared.As shown in figure 3, of the present invention for electricity The change time limit distance protection distance measuring method 300 on cable road is since step 301.
In step 301, acquisition becomes the instantaneous value of two sub-value of three-phase voltage and electric current of time limit distance protection installation place.
In step 302, three-phase voltage fundamental wave is determined according to the instantaneous value of two sub-value of the three-phase voltage of the acquisition and electric current Phasor valueWith current first harmonics phasor valueAnd according to change time limit distance protection installation place Current first harmonics phasor valueCalculate zero-sequence currentWherein, wherein the three-phase voltage fundamental phasors value and Three-phase current fundamental phasors value is the instantaneous value by two sub-value of three-phase voltage and electric current to acquisition using fourier algorithm meter It obtains.Calculate zero-sequence currentFormula are as follows:
In step 303, the respective definite value Z of 3 distance protection sections of installation place will be protectedZDiImpedance is adjusted respectively as it Value ZZDFNi(j)Value in j=1, wherein 1≤i < 4；
In step 304, one sub-value B of impedance, the voltage transformer no-load voltage ratio N of every kilometer of installation place of setting protectionptIt is mutual with electric current Sensor no-load voltage ratio NctValue, and establish the earthing reactance line criterion, null sequence reactor criterion and alternate reactance of 3 distance protection sections Line criterion, in which:
The formula of earthing reactance line criterion are as follows:
The formula of null sequence reactor criterion are as follows:
The formula of alternate reactance line criterion are as follows:
In formula, K is pre-set zero-utility theory,It is faulted phase voltage, value is the voltage fundamental of failure phase Phasor value,It is failure voltage between phases, value is the difference of the alternate voltage fundamental phasor value of failure,It is faulted phase current, Its value is the current first harmonics phasor value of failure phase,It is failure three-phase current, value is the alternate current first harmonics phasor of failure The difference of value,It is zero-sequence current, ZZDFNi(j)It is the adjusting impedance of distance protection i sections of jth time, wherein 1≤i < 4,2≤j < n, n are Natural number greater than 10；
In step 305, determine that line fault is single-phase fault or phase-to phase fault；
In step 306, when line fault is single-phase fault, when line fault is single-phase fault, by faulted phase voltageFaulted phase currentAnd the adjusting impedance value Z determinedZDFNi(1)And zero-sequence current3 distance protection sections are substituted into respectively Earthing reactance line criterion formula
With the formula of null sequence reactor criterion
When not being that 4-i distance protection section since i sections of distance protection is all satisfied 90 °≤F1i(1)≤ 270 ° and 90 °≤ F2i(1)At≤270 °, ranging terminates；
When the earthing reactance line criterion value and null sequence reactor criterion of 3 distance protection sections since 1 section of distance protection When value is between 90 ° and 270 °, since j=2, according to 1 section of distance protection established earthing reactance line criterion F11(j)With Null sequence reactor criterion F21(j), 1 section of distance protection of definite value ZZD1And -1 adjusting impedance value Z of jthZDFN1(j-1)Calculate distance Protect the adjusting impedance value Z of 1 section of jth timeZDFN1(j), its calculation formula is:
As 1 section of distance protection satisfaction, 90 °≤F11(j-1)≤ 270 ° and 90 °≤F21(j-1)At≤270 °,
ZZDFN1(j)=ZZDFN1(j-1)-0.5j-1*ZZD1
90 °≤F1 is unsatisfactory for when 1 section of distance protection1(j-1)≤ 270 ° or 90 °≤F21(j-1)At≤270 °,
ZZDFN1(j)=ZZDFN1(j-1)+0.5j-1*ZZD1
In formula, 2≤j < n, n are the natural number greater than 10.
Or when since 2 sections of distance protection ing earthing reactance line criterion value and null sequence reactor criterion value at 90 ° and When between 270 °, since j=2, according to 2 sections of distance protection established earthing reactance line criterion F12(j)And null sequence reactor Criterion F22(j), 2 sections of distance protection of definite value ZZD2And -1 adjusting impedance value Z of jthZDFN2(j-1)Calculate 2 sections of jth of distance protection Secondary adjusting impedance value ZZDFN2(j)Formula are as follows:
As 2 sections of distance protection satisfactions, 90 °≤F12(j-1)≤ 270 ° and 90 °≤F22(j-1)At≤270 °,
ZZDFN2(j)=ZZDFN2(j-1)-0.5j-1*ZZD2
90 °≤F1 is unsatisfactory for when 2 sections of distance protection2(j-1)≤ 270 ° or 90 °≤F22(j-1)At≤270 °,
ZZDFN2(j)=ZZDFN2(j-1)+0.5j-1*ZZD2
In formula, 2≤j < n, n are the natural number greater than 10.
Or only 3 sections of earthing reactance line criterion values of distance protection and null sequence reactor criterion value between 90 ° and 270 ° When, since j=2, according to 3 sections of distance protection established earthing reactance line criterion F13(j)With null sequence reactor criterion F23(j)、 3 sections of distance protection of definite value ZZD3And -1 adjusting impedance value Z of jthZDFN3(j-1)Calculate the adjusting resistance of 3 sections of jth of distance protection time Anti- value ZZDFN3(j)Formula are as follows:
As 3 sections of distance protection satisfactions, 90 °≤F13(j-1)≤ 270 ° and 90 °≤F23(j-1)At≤270 °,
ZZDFN3(j)=ZZDFN3(j-1)-0.5j-1*ZZD3
90 °≤F1 is unsatisfactory for when 3 sections of distance protection3(j-1)≤ 270 ° or 90 °≤F23(j-1)At≤270 °,
ZZDFN3(j)=ZZDFN3(j-1)+0.5j-1*ZZD3
In formula, 2≤j < n, n are the natural number greater than 10.
In step 307, when line fault is phase-to phase fault, by failure voltage between phasesFailure three-phase current With adjusting impedance value ZZDFNi(1)The formula of the alternate reactance line criterion of 3 distance protection sections is substituted into respectively:
When not being that 4-i distance protection section since i sections of distance protection is all satisfied 90 °≤F3i(1)≤ 270 ° and 90 °≤ F3i(1)At≤270 °, ranging terminates, wherein 1≤i < 4；
When 3 distance protection sections since 1 section of distance protection are all satisfied 90 °≤F3i(1)At≤270 °, opened from j=2 Begin, according to 1 section of distance protection established alternate reactance line criterion F31(j), 1 section of distance protection of definite value ZZD1And jth -1 time Adjust impedance value ZZDFNi(j-1)Calculate the adjusting impedance value Z of 1 section of jth of distance protection timeZDFNi(j), its calculation formula is:
As 1 section of distance protection satisfaction, 90 °≤F31(j-1)At≤270 °,
ZZDFN1(j)=ZZDFN1(j-1)-0.5j-1*ZZD1
90 °≤F3 is unsatisfactory for when 1 section of distance protection1(j-1)At≤270 °,
ZZDFN1(j)=ZZDFN1(j-1)+0.5j-1*ZZD1
2≤j < n in formula, n are the natural number greater than 10.
Or when 2 distance protection sections since 2 sections of distance protection are all satisfied 90 °≤F3i(1)At≤270 °, from j=2 Start, according to 2 sections of distance protection established alternate reactance line criterion F32(j), 2 sections of distance protection of definite value ZZD2And jth -1 Secondary adjusting impedance value ZZDFN2(j-1)Calculate the adjusting impedance value Z of 2 sections of jth of distance protection timeZDFN2(j), its calculation formula is:
As 2 sections of distance protection satisfactions, 90 °≤F32(j-1)At≤270 °,
ZZDFNi(j)=ZZDFNi(j-1)-0.5j-1*ZZDi
90 °≤F3 is unsatisfactory for when 2 sections of distance protection2(j-1)At≤270 °,
ZZDFN2(j)=ZZDFN2(j-1)+0.5j-1*ZZD2
In formula, 2≤j < n, n are the natural number greater than 10.
Or 90 °≤F3 of only 3 sections of distance protection satisfactions3(1)At≤270 °, since j=2, according to 3 sections of distance protection Established alternate reactance line criterion F33(j), 3 sections of distance protection of definite value ZZD3And -1 adjusting impedance value Z of jthZDFN3(j-1) Calculate the adjusting impedance value Z of 3 sections of jth of distance protection timeZDFN3(j), its calculation formula is:
As 3 sections of distance protection satisfactions, 90 °≤F33(j-1)At≤270 °,
ZZDFN3(j)=ZZDFN3(j-1)-0.5j-1*ZZD3
90 °≤F3 is unsatisfactory for when 3 sections of distance protection3(j-1)At≤270 °,
ZZDFN3(j)=ZZDFN3(j-1)+0.5j-1*ZZD3
In formula, 2≤j < n, n are the natural number greater than 10.
In step 308, according to the one sub-value B of impedance of pre-set every kilometer of installation place of protection, voltage transformer no-load voltage ratio Npt, current transformer ratio NctAnd the adjusting impedance value Z of i sections of the distance protection as j=n-1ZDFNi(n-1)Calculate route event The distance C of barrier point and protection installation place.
Preferably, according to one sub-value B of impedance, the voltage transformer no-load voltage ratio N of pre-set every kilometer of installation place of protectionpt、 Current transformer ratio NctAnd the adjusting impedance value Z of i sections of the distance protection as j=n-1ZDFNi(n-1)Calculate line fault point With the formula of the distance C of protection installation place are as follows:
C=(ZZDFNi(n-1)×(Npt/Nct))/B
In formula, B is the setting value of one sub-value of impedance of every kilometer of installation place of protection, NptIt is voltage transformer no-load voltage ratio, NctIt is Current transformer ratio, ZZDFNi(n-1)It is i sections of the distance protection adjusting impedance value Z in j=n-1ZDFNi(n-1)。
The structure and embodiment of the change time limit distance protection measuring device for power network line in this preferred embodiment It is identical in one, it no longer describes herein.
The present invention is described by reference to a small amount of embodiment.However, it is known in those skilled in the art, as Defined by subsidiary Patent right requirement, in addition to the present invention other embodiments disclosed above equally fall in it is of the invention In range.
Normally, all terms used in the claims are all solved according to them in the common meaning of technical field It releases, unless in addition clearly being defined wherein.All references " one/described/be somebody's turn to do [device, component etc.] " are all opened ground At least one example being construed in described device, component etc., unless otherwise expressly specified.Any method disclosed herein Step need not all be run with disclosed accurate sequence, unless explicitly stated otherwise.

Claims (10)

1. a kind of change time limit distance protection distance measuring method for power network line, which is characterized in that the described method includes:
Determine that line fault is single-phase fault or phase-to phase fault；
When line fault is single-phase fault, according to faulted phase voltageFaulted phase currentAdjust impedance value ZZDFNi(1)With And zero-sequence currentDetermine whether the m-i distance protection section definite value since i sections of distance protection meets the ground connection respectively established Reactance line criterion F1i(1)With null sequence reactor criterion F2i(1), and if only if the m-i distance protection since i sections of distance protection Section all meets the earthing reactance line criterion F1 respectively establishedi(1)With null sequence reactor criterion F2i(1)When, since j=2, according to away from From i sections of established earthing reactance line criterion F1 of protectioni(j)With null sequence reactor criterion F2i(j), i sections of distance protection of definite value ZZDi And -1 adjusting impedance value Z of jthZDFNi(j-1)Calculate the adjusting impedance value Z of distance protection i sections of jth timeZDFNi(j), wherein 1≤i < m, 2≤j < n, m are the natural number greater than 3, and n is the natural number greater than 10；
When line fault is phase-to phase fault, according to failure voltage between phasesFailure three-phase currentWith adjusting impedance value ZZDFNi(1)Determine whether the m-i distance protection section since i sections of distance protection meets respective established alternate reactance line and sentence According to F3i(1), all meet respective established alternate reactance and if only if the m-i distance protection section since i sections of distance protection Line criterion F3i(1)When, since j=2, according to i sections of distance protection established alternate reactance line criterion F3i(j), distance protection i The definite value Z of sectionZDiWith -1 adjusting impedance value Z of jthZDFNi(j-1)Calculate the adjusting impedance value Z of distance protection i sections of jth timeZDFNi(j), Wherein, 1≤i < m, 2≤j < n, m are the natural number greater than 3, and n is the natural number greater than 10；
According to one sub-value B of impedance, the voltage transformer no-load voltage ratio N of pre-set every kilometer of installation place of protectionpt, current transformer become Compare NctAnd the adjusting impedance value Z of i sections of the distance protection as j=n-1ZDFNi(n-1)Calculate line fault point and protection installation place Distance C.
2. the method according to claim 1, wherein determining that line fault is single-phase fault or phase-to phase fault Include: before
Acquisition becomes the instantaneous value of two sub-value of three-phase voltage and electric current of time limit distance protection installation place；
Three-phase voltage fundamental phasors value is determined according to the instantaneous value of two sub-value of the three-phase voltage of the acquisition and electric currentWith current first harmonics phasor valueAnd according to the electric current base for becoming time limit distance protection installation place Wave phasor valueCalculate zero-sequence currentAnd faulted phase voltage fundamental phasors are set and areIts value, which is equal to, to be occurred Faulted phase current fundametal compoment is arranged in the voltage fundamental phasor value of the phase of failureIts value is equal to the electric current of the phase to break down Fundamental phasors value；
The respective definite value Z of m-1 distance protection section of installation place will be protectedZDiImpedance value Z is adjusted respectively as itZDFNi(j)In j= Value when 1, wherein 1≤i < m, m are the natural number greater than 3；
One sub-value B of impedance, the voltage transformer no-load voltage ratio N of every kilometer of installation place of protection are setptWith current transformer ratio NctValue；
Establish the earthing reactance line criterion, null sequence reactor criterion and alternate reactance line criterion of each distance protection section, in which:
The formula of earthing reactance line criterion are as follows:
The formula of null sequence reactor criterion are as follows:
The formula of alternate reactance line criterion are as follows:
In formula, K is pre-set zero-utility theory,It is faulted phase voltage, value is the voltage fundamental phasor of failure phase Value,It is failure voltage between phases, value is the difference of the alternate voltage fundamental phasor value of failure,It is faulted phase current, value For the current first harmonics phasor value of failure phase,Failure three-phase current, value be the alternate current first harmonics phasor value of failure it Difference,It is zero-sequence current, ZZDFNi(j)It is the adjusting impedance of distance protection i sections of jth time, wherein 1≤i < m, 2≤j < n, m are big In 3 natural number, n is the natural number greater than 10.
3. according to the method described in claim 2, it is characterized in that, when line fault is single-phase fault, according to failure mutually electricity PressureFaulted phase currentAdjust impedance value ZZDFNi(1)And zero-sequence currentDetermine the m-i since i sections of distance protection Whether a distance protection section meets respective established earthing reactance line criterion F1i(1)With null sequence reactor criterion F2i(1), when and Only when the m-i distance protection section since i sections of distance protection all meets respective established earthing reactance line criterion F1i(1)With Null sequence reactor criterion F2i(1)When, since j=2, according to i sections of distance protection established earthing reactance line criterion F1i(j)With Null sequence reactor criterion F2i(j), i sections of distance protection of definite value ZZDiAnd -1 adjusting impedance value Z of jthZDFNi(j-1)Calculate distance The adjusting impedance value Z of protection i sections of jth timeZDFNi(j)Include:
By faulted phase voltageFaulted phase currentAnd the adjusting impedance value Z determinedZDFNi(1)And zero-sequence currentGeneration respectively Enter the formula F 1 of earthing reactance line criterioni(1)With the formula F 2 of null sequence reactor criterioni(1), when not being since i sections of distance protection M-i distance protection section be all satisfied 90 °≤F1i(1)≤ 270 ° and 90 °≤F2i(1)At≤270 °, ranging terminates；
When the m-i distance protection section since i sections of distance protection is all satisfied 90 °≤F1i(1)≤ 270 ° and 90 °≤F2i(1)≤ At 270 °, since j=2, according to i sections of distance protection established earthing reactance line criterion F1i(j)With null sequence reactor criterion F2i(j), i sections of distance protection of definite value ZZDiAnd -1 adjusting impedance value Z of jthZDFNi(j-1)Calculate distance protection i sections of jth time Adjust impedance value ZZDFNi(j), formula are as follows:
As 90 °≤F1 of i sections of distance protection satisfactionsi(j-1)≤ 270 ° and 90 °≤F2i(j-1)At≤270 °,
ZZDFNi(j)=ZZDFNi(j-1)-0.5j-1*ZZDi
90 °≤F1 is unsatisfactory for when i sections of distance protectioni(j-1)≤ 270 ° or 90 °≤F2i(j-1)At≤270 °,
ZZDFNi(j)=ZZDFNi(j-1)+0.5j-1*ZZDi
In formula, 1≤i < m, 2≤j < n, m are the natural number greater than 3, and n is the natural number greater than 10.
4. alternate according to failure according to the method described in claim 2, it is characterized in that, when line fault is phase-to phase fault VoltageFailure three-phase currentWith adjusting impedance value ZZDFNi(1)Determine that the m-i distance since i sections of distance protection is protected Whether shield section meets respective established alternate reactance line criterion F3i(1), and if only if m-i since i sections of distance protection Distance protection section all meets respective established alternate reactance line criterion F3i(1)When, since j=2, according to i sections of distance protection Established alternate reactance line criterion F3i(j), i sections of distance protection of definite value ZZDiWith -1 adjusting impedance value Z of jthZDFNi(j-1)Meter Calculate the adjusting impedance value Z of distance protection i sections of jth timeZDFNi(j)Include:
By failure voltage between phasesFailure three-phase currentWith adjusting impedance value ZZDFNi(1)Alternate reactance line is substituted into respectively to sentence According to F3i(1), when not being that m-i distance protection section since i sections of distance protection is all satisfied 90 °≤F3i(1)≤ 270 ° and 90 °≤ F3i(1)At≤270 °, ranging terminates；
When the m-i distance protection section since i sections of distance protection is all satisfied 90 °≤F3i(1)At≤270 °, since j=2, root According to i sections of distance protection established alternate reactance line criterion F3i(j)I sections of distance protection of definite value ZZDiAnd -1 adjusting of jth resistance Anti- value ZZDFNi(j-1)Calculate the adjusting impedance value Z of distance protection i sections of jth timeZDFNi(j), formula are as follows:
As 90 °≤F3 of i sections of distance protection satisfactionsi(j-1)At≤270 °,
ZZDFNi(j)=ZZDFNi(j-1)-0.5j-1*ZZDi
90 °≤F3 is unsatisfactory for when i sections of distance protectioni(j-1)At≤270 °,
ZZDFNi(j)=ZZDFNi(j-1)+0.5j-1*ZZDi
In formula, 1≤i < m, 2≤j < n, m are the natural number greater than 3, and n is the natural number greater than 10.
5. according to method described in claim 3 or 4, which is characterized in that according to pre-set every kilometer of installation place of protection One sub-value B of impedance, voltage transformer no-load voltage ratio Npt, current transformer ratio NctAnd i sections of the distance protection as j=n-1 Adjust impedance value ZZDFNi(n-1)It calculates line fault point and protects the formula of the distance C of installation place are as follows:
C=(ZZDFNi(n-1)×(Npt/Nct))/B
In formula, B is the setting value of one sub-value of impedance of every kilometer of installation place of protection, NptIt is voltage transformer no-load voltage ratio, NctIt is electric current Mutual inductor ratio, ZZDFNi(n-1)It is i sections of the distance protection adjusting impedance value Z in j=n-1ZDFNi(n-1)。
6. a kind of change time limit distance protection range unit for power network line, which is characterized in that described device includes:
Fault type determination unit is used to determine that line fault to be single-phase fault or phase-to phase fault；
Third computing unit is used for when line fault is single-phase fault, according to faulted phase voltageFaulted phase current Adjust impedance value ZZDFNi(1)And zero-sequence currentDetermine whether the m-i distance protection section since i sections of distance protection meets Respective established earthing reactance line criterion F1i(1)With null sequence reactor criterion F2i(1), and if only if since i sections of distance protection M-i distance protection section all meet respective established earthing reactance line criterion F1i(1)With null sequence reactor criterion F2i(1)When, Since j=2, according to i sections of distance protection established earthing reactance line criterion F1i(j)With null sequence reactor criterion F2i(j), away from Definite value Z of i sections from protectionZDiAnd -1 adjusting impedance value Z of jthZDFNi(j-1)Calculate the adjusting impedance of distance protection i sections of jth time Value ZZDFNi(j), wherein 1≤i < m, 2≤j < n, m are the natural number greater than 3, and n is the natural number greater than 10；
4th computing unit is used for when line fault is phase-to phase fault, according to failure voltage between phasesThe alternate electricity of failure StreamWith adjusting impedance value ZZDFNi(1)Determine whether the n-i distance protection section since i sections of distance protection meets respectively self The alternate reactance line criterion F3 establishedi(1), all meet respectively and if only if the m-i distance protection section since i sections of distance protection From established alternate reactance line criterion F3i(1)When, since j=2, according to i sections of distance protection established alternate reactance lines Criterion F3i(j), i sections of distance protection of definite value ZZDiWith -1 adjusting impedance value Z of jthZDFNi(j-1)Calculate distance protection i sections of jth time Adjusting impedance value ZZDFNi(j), wherein 1≤i < m, 2≤j < n, m are the natural number greater than 3, and n is the natural number greater than 10；
5th computing unit is used for one sub-value B of impedance, voltage transformer according to pre-set every kilometer of installation place of protection No-load voltage ratio Npt, current transformer ratio NctAnd the adjusting impedance value Z of i sections of the distance protection as j=n-1ZDFNi(n-1)Calculate line The distance C of road fault point and protection installation place.
7. device according to claim 6, which is characterized in that described device further include:
Data acquisition unit is used to acquire the instantaneous of two sub-value of three-phase voltage and electric current for becoming time limit distance protection installation place Value；
First computing unit is used to determine three-phase voltage according to the instantaneous value of two sub-value of three-phase voltage and electric current of the acquisition Fundamental phasors valueWith current first harmonics phasor valueAnd it is installed according to time limit distance protection is become Two sub-value of current first harmonics phasor at placeCalculate zero-sequence current
Second computing unit is used to protect the respective definite value Z of m-1 distance protection section of installation placeZDiIt is whole respectively as its Constant impedance value ZZDFNi(j)Value in j=1, wherein 1≤i < m, m are the natural number greater than 3；
Parameter set unit is used to be arranged one sub-value B of impedance, the voltage transformer no-load voltage ratio N of every kilometer of installation place of protectionptAnd electricity Current transformer no-load voltage ratio NctValue, and establish earthing reactance line criterion, null sequence reactor criterion and the phase of each distance protection section Between reactance line criterion, in which:
The formula of earthing reactance line criterion are as follows:
The formula of null sequence reactor criterion are as follows:
The formula of alternate reactance line criterion are as follows:
In formula, K is pre-set zero-utility theory,It is faulted phase voltage, value is the voltage fundamental phasor of failure phase Value,It is failure voltage between phases, value is the difference of the alternate voltage fundamental phasor value of failure,It is faulted phase current, value For the current first harmonics phasor value of failure phase,Failure three-phase current, value be the alternate current first harmonics phasor value of failure it Difference,It is zero-sequence current, ZZDFNi(j)It is the adjusting impedance of distance protection i sections of jth time, wherein 1≤i < m, 2≤j < n, m are big In 3 natural number, n is the natural number greater than 10.
8. device according to claim 7, which is characterized in that the third computing unit is single-phase fault in line fault When, according to faulted phase voltageFaulted phase currentAdjust impedance value ZZDFNi(1)And zero-sequence currentIt determines and is protected from distance Whether m-i distance protection section of i sections of beginnings of shield meets respective established earthing reactance line criterion F1i(1)And null sequence reactor Criterion F2i(1), all meet respectively established ground connection electricity and if only if the m-i distance protection section since i sections of distance protection Anti- line criterion F1i(1)With null sequence reactor criterion F2i(1)When, since j=2, according to i sections of distance protection established ground connection electricity Anti- line criterion F1i(j)With null sequence reactor criterion F2i(j), i sections of distance protection of definite value ZZDiAnd -1 adjusting impedance value of jth ZZDFNi(j-1)Calculate the adjusting impedance value Z of distance protection i sections of jth timeZDFNi(j)Include:
By faulted phase voltageFaulted phase currentAnd the adjusting impedance value Z determinedZDFNi(1)And zero-sequence currentGeneration respectively Enter the formula F 1 of earthing reactance line criterioni(1)With the formula F 2 of null sequence reactor criterioni(1), when not being since i sections of distance protection M-i distance protection section be all satisfied 90 °≤F1i(1)≤ 270 ° and 90 °≤F2i(1)At≤270 °, ranging terminates；
When the m-i distance protection section since i sections of distance protection is all satisfied 90 °≤F1i(1)≤ 270 ° and 90 °≤F2i(1)≤ At 270 °, since j=2, according to i sections of distance protection established earthing reactance line criterion F1i(j)With null sequence reactor criterion F2i(j), i sections of distance protection of definite value ZZDiAnd -1 adjusting impedance value Z of jthZDFNi(j-1)Calculate distance protection i sections of jth time Adjust impedance value ZZDFNi(j), formula are as follows:
As 90 °≤F1 of i sections of distance protection satisfactionsi(j-1)≤ 270 ° and 90 °≤F2i(j-1)At≤270 °,
ZZDFNi(j)=ZZDFNi(j-1)-0.5j-1*ZZDi
90 °≤F1 is unsatisfactory for when i sections of distance protectioni(j-1)≤ 270 ° or 90 °≤F2i(j-1)At≤270 °,
ZZDFNi(j)=ZZDFNi(j-1)+0.5j-1*ZZDi
In formula, 1≤i < m, 2≤j < n, m are the natural number greater than 3, and n is the natural number greater than 10.
9. device according to claim 7, which is characterized in that the 4th computing unit is alternate event in line fault Barrier, according to failure voltage between phasesFailure three-phase currentWith adjusting impedance value ZZDFNi(1)Determination is opened from i sections of distance protection Whether the m-i distance protection section of beginning meets respective established alternate reactance line criterion F3i(1), and if only if from distance protection M-i distance protection section of i sections of beginnings all meets respective established alternate reactance line criterion F3i(1)When, since j=2, root According to i sections of distance protection established alternate reactance line criterion F3i(j), i sections of distance protection of definite value ZZDiIt is hindered with -1 adjusting of jth Anti- value ZZDFNi(j-1)Calculate the adjusting impedance value Z of distance protection i sections of jth timeZDFNi(j)Include:
By failure voltage between phasesFailure three-phase currentWith adjusting impedance value ZZDFNi(1)Alternate reactance line is substituted into respectively to sentence According to F3i(1), when not being that m-i distance protection section since i sections of distance protection is all satisfied 90 °≤F3i(1)≤ 270 ° and 90 °≤ F3i(1)At≤270 °, ranging terminates；
When the m-i distance protection section since i sections of distance protection is all satisfied 90 °≤F3i(1)At≤270 °, since j=2, root According to i sections of distance protection established alternate reactance line criterion F3i(j)I sections of distance protection of definite value ZZDiAnd -1 adjusting of jth resistance Anti- value ZZDFNi(j-1)Calculate the adjusting impedance value Z of distance protection i sections of jth timeZDFNi(j)Formula are as follows:
As 90 °≤F3 of i sections of distance protection satisfactionsi(j-1)At≤270 °,
ZZDFNi(j)=ZZDFNi(j-1)-0.5j-1*ZZDi
90 °≤F3 is unsatisfactory for when i sections of distance protectioni(j-1)At≤270 °,
ZZDFNi(j)=ZZDFNi(j-1)+0.5j-1*ZZDi
In formula, 1≤i < m, 2≤j < n, m are the natural number greater than 3, and n is the natural number greater than 10.
10. according to device described in claim 8 or 9, which is characterized in that the 5th computing unit is according to pre-set Protect one sub-value B of impedance, the voltage transformer no-load voltage ratio N of every kilometer of installation placept, current transformer ratio NctAnd work as j=n-1 When i sections of distance protection of adjusting impedance value ZZDFNi(n-1)It calculates line fault point and protects the formula of the distance C of installation place are as follows:
C=(ZZDFNi(n-1)×(Npt/Nct))/B
In formula, B is the setting value of one sub-value of impedance of every kilometer of installation place of protection, NptIt is voltage transformer no-load voltage ratio, NctIt is electric current Mutual inductor ratio, ZZDFNi(n-1)It is i sections of the distance protection adjusting impedance value Z in j=n-1ZDFNi(n-1)。
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