CN106908692A - A kind of transmission line one-phase earth fault self adaptation reclosing determination methods - Google Patents
A kind of transmission line one-phase earth fault self adaptation reclosing determination methods Download PDFInfo
- Publication number
- CN106908692A CN106908692A CN201710123414.7A CN201710123414A CN106908692A CN 106908692 A CN106908692 A CN 106908692A CN 201710123414 A CN201710123414 A CN 201710123414A CN 106908692 A CN106908692 A CN 106908692A
- Authority
- CN
- China
- Prior art keywords
- gamma
- sinh
- cosh
- phase
- sequence
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
A kind of transmission line one-phase earth fault self adaptation reclosing determination methods, two three-phase voltages and three-phase current at moment are gathered as input quantity in the side of transmission line of electricity;Using two voltages at moment, the corresponding positive and negative, residual voltage of Current calculation, the electric current phasor that measure;Based on Transmission Line Distributed Parameter model, respectively for two kinds of possible fault types of permanent singlephase earth fault and transient single-phase earth fault, set up equation and describe the voltage of transmission line of electricity both sides, current relationship, obtain two groups of Nonlinear System of Equations;With measuring point to the electrical source voltage of side system, equivalent system impedance, fault distance and transition resistance as unknown quantity, solve the Nonlinear System of Equations set up, draw respectively for two groups of fault localization results of Nonlinear System of Equations, and seek its ratio, ratio then judges to there occurs single-phase permanent earth fault, lock-reclosing lock function less than threshold value;Otherwise it is judged as there occurs single-phase instantaneity earth fault, implements reclosing.
Description
Technical field
The present invention relates to protecting electrical power system and control field, more particularly to a kind of transmission line one-phase earth fault is adaptive
Answer reclosing determination methods.
Technical background
Automatic reclosing technology obtains commonly used on 110kV above transmission lines of electricity, is connect for instantaneity
Earth fault can automatic recovery of power supply, but if permanent earth fault, implement reclosing power system will be produced
Secondary pulse, affects the stability of system.Therefore, self adaptation reclosing technology has obtained extensive concern.
Existing self adaptation reclosing technology is mainly using failure phase line after the circuit breaker trip of failure phase both sides due to non-
The fault signature that secondary arc current and Coupling Between Phases of failure phase line etc. are induced recognize whether stabilization ground connection branch
Road, so as to distinguish instantaneity earth fault or permanent earth fault.But because Coupling Between Phases or secondary arc current are produced
Fault signature it is more faint, it is permanent earth to identify whether just with the information after the circuit breaker trip of trouble point both sides
Failure success rate is not high, is not also widely used in power system at present.
National inventing patent《Transmission line one-phase earth fault method of single end distance measurement》, application number:201310415348.2.
Fault localization problem is switched into the identification problem to wire topologies, using transmission line of electricity occur singlephase earth fault after and
It is interrupted before both sides breaker does not trip, and after the failure phase circuit breaker trip of circuit both sides and during the first two of reclosing
The monitored equations of line of single-end electrical quantity description under face, information content is double, therefore, it is possible to accurately obtain fault distance, but simultaneously
Can not solve the problems, such as that self adaptation reclosing differentiates, the information based on discontinuity surface at two is found in research process, it is false respectively
If failure under two topological structures of instantaneity earth fault and permanent earth fault to attend as a nonvoting delegate equation group and calculating fault distance,
The error energy direct reaction of fault localization is out of order the difference of type, and its main cause is the fault branch of stabilization with the presence or absence of will
Stability of the failure phase line in 2 times voltages of moment is directly influenced, and the stability will result directly in the size of range error,
Therefore it is self adaptation reclosing algorithm that can further expand Fault Location Algorithm.
The content of the invention
The purpose of the present invention is the weak point for overcoming prior art, a kind of instantaneous single-phase earthing event of transmission line of electricity of proposition
Barrier self adaptation reclosing determination methods, it is self adaptation reclosing algorithm, the algorithm that can further expand Fault Location Algorithm
Based on single-end electrical quantity, do not influenceed by communication;Modeled using distributed constant, do not influenceed by capacitance current, not by transition
Resistance, load current, the influence of offside system impedance, with practical value very high.
In order to achieve the above object, the technical scheme is that:
A kind of instantaneous singlephase earth fault self adaptation reclosing determination methods of transmission line of electricity, comprise the following steps:
(1) defeated hypothesis electric line is M sides, the open circuit after transmission line of electricity either side, measurement faulty line singlephase earth fault
The moment is the three-phase voltage phasor U at moment 1 before the single-phase tripping operation of devicemfa、Umfb、UmfcWith three-phase current phasor Imfa、Imfb、Imfc, with
And the moment is the three-phase voltage phasor U at moment 2 before reclosing after measurement failure phase circuit breaker tripmha、Umhb、UmhcAnd electric current
Phasor Imha、Imhb、Imhc, above-mentioned measurement is used as input quantity;By following formula be calculated above-mentioned two moment corresponding positive sequence, negative phase-sequence,
Residual voltage phasor Umf1、Umf2、Umf0With electric current phasor Imf1、Imf2、Imf0, and Umh1、Umh2、Umh0With positive sequence, negative phase-sequence, zero sequence
Electric current phasor Imh1、Imh2、Imh0:
Wherein a=ej2π/3;
(2) electricity that equation describes transmission line of electricity both sides is set up using step (1) voltage for being calculated, current sequence components
Pressure, current relationship, obtain two groups of Nonlinear System of Equations:
Transmission line of electricity both sides voltage-current relationship equation group (1) described under permanent singlephase earth fault are:
Transmission line of electricity both sides voltage-current relationship equation group (2) under description transient single-phase earth fault are:
Wherein Unhy1、Unhy2、Unhy0、Inhy1、Inhy2、Inhy0Represent that 2 times hypothesis failures of moment are the event of permanent single-phase earthing
Under barrier, the positive sequence voltage of the circuit offside (N sides) being calculated based on equation group (1), negative sequence voltage, residual voltage, positive sequence electricity
Stream, negative-sequence current, zero-sequence current phasor;Unhs1、Unhs2、Unhs0、Inhs1、Inhs2、Inhs0Represent that 2 times hypothesis failures of moment are instantaneous
Under property singlephase earth fault, positive sequence voltage, negative sequence voltage, the zero sequence of the circuit offside (N sides) being calculated based on equation group (2)
Voltage, forward-order current, negative-sequence current, zero-sequence current phasor;L is transmission line length, γ1It is positive sequence propagation coefficient:γ0It is zero sequence propagation coefficient:Zc1It is positive sequence ripple
Impedance:R1、L1、G1、C1Respectively the positive sequence resistance of unit length circuit, inductance,
Conductance and capacitance;
Zc0It is zero sequence wave impedance:R0、L0、G0、C0Respectively unit length line
The zero sequence resistance on road, inductance, conductance and capacitance;
A is voltage Transfer coefficient matrices, and B is impedance matrix, and C is admittance matrix, and D is electric current Transfer coefficient matrices, specifically
It is defined as follows:
(3), two groups of sequence voltages of N sides three, electric current phasor U will be calculated in step (2)nhy1、Unhy2、Unhy0、Inhy1、
Inhy2、Inhy0And Unhs1、Unhs2、Unhs0、Inhs1、Inhs2、Inhs0Following formula is substituted into, calculating is respectively obtained based on failure permanently to connect
N sides three-phase voltage, electric current phasor U that earth fault is assumednhya、Unhyb、Unhyc、Inhya、Inhyb、Inhyc, and be instantaneous based on failure
Property earth fault assume N sides three-phase voltage, electric current phasor Unhsa、Unhsb、Unhsc、Inhsa、Inhsb、Inhsc:
(4) unknown quantity is set:System N sides potentials EN, positive sequence impedance ZN1,ZN0, fault resstance R, trouble point and system M sides it
Between distance account for the percentage x of line length;Assuming that failure is permanent singlephase earth fault, equation below group (3) is write out:
Wherein:ZsIt is system side self-impedanceZmIt is system side mutual impedance
The relevant parameter that will be measured in step (1)-(4) or be calculated, substitutes into (3), and by non-linear Complex in (3)
Group separates real part imaginary part, changes into the Nonlinear System of Equations of real number, the zero sequence impedance Z of given system N sidesN0, use improved height
This-Newton method Levenbery-Marquardt methods are solved, you can must assume that failure is the trouble point under permanent fault
With the percentage x that the distance between system M sides account for line lengthy;
(5) assume that failure is transient single-phase earth fault, write out equation below group (4):
The relevant parameter that will be measured in step (1)-(4) or be calculated, substitutes into (4), and by non-linear Complex in (4)
Group separates real part imaginary part, changes into the Nonlinear System of Equations of real number, the zero sequence impedance Z of given system N sidesN0, use improved height
This-Newton method method solved, you can must assume that failure is the distance between the trouble point under transient fault and system M sides
Account for the percentage x of line lengths;
6) ratio=is defined | xy-xs| × 100, instantaneity is (silent through small resistor at advance simulation calculation circuit proximal outlet
Recognize 10 ohm of value) singlephase earth fault occur when ratio values as threshold value;If the ratio values being actually calculated are small
Then judge to there occurs single-phase permanent earth fault, lock-reclosing lock function in threshold value;Otherwise it is judged as there occurs single-phase instantaneous
Property earth fault, implement reclosing.
The features of the present invention and effect:
Before present invention utilization is monitored after transmission line of electricity generation singlephase earth fault and both sides breaker does not trip,
And inscribed after the failure phase circuit breaker trip of circuit both sides and during the first two of reclosing, it is assumed that failure is permanently to connect
Earth fault and instantaneity earth fault, row write equation group and ask for fault distance deviation, and equation group is to transmission line of electricity physical fault shape
The description accuracy of state will be reacted directly into the deviation of fault distance solution, therefore instantaneity or permanent fault type identification
Accurately, and the method be based on single-end electrical quantity, do not influenceed by communication;The inventive method is modeled using distributed constant, is not distributed
The influence of capacitance current, is not influenceed, with practical value very high by transition resistance, load, offside system impedance.
Brief description of the drawings
Fig. 1 is a kind of traditional transmission system model of 220kV.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment one
A kind of traditional transmission system model of 220kV is as shown in figure 1, line length is 100km, line parameter circuit value value such as table 1
It is shown;System M sides potential is 220 ∠, 0 ° of kV;System M sides zero sequence impedance is 26.3 ∠, 90 ° of Ω;Positive sequence impedance is:29.3∠90°
Ω;System N sides potential is 220 ∠, 30 ° of kV;System N sides zero sequence impedance is 28.14 ∠, 86.74 ° of Ω;Positive sequence impedance is:32.0∠
78.4°Ω.System M sides are arranged on using the fault location device of the inventive method, voltage, electric current are respectively from line side voltage
Transformer, current transformer.Simulated fault type is A phase permanent earth faults, and failure occurs at system M side 50km,
The Ω of transition resistance 100.
The 220kV transmission line of electricity major parameters of table 1
Comprised the following steps that using the embodiment of the inventive method:
(1) in M side systems side, A, B, C the three-phase voltage phase after measurement faulty line singlephase earth fault before single-phase tripping operation
Amount Umfa、Umfb、UmfcWith electric current phasor Imfa、Imfb、Imfc, and A, B, C the three-phase voltage phase after single-phase tripping operation before reclosing
Amount Umha、Umhb、UmhcWith electric current phasor Imha、Imhb、ImhcAs input quantity:
After singlephase earth fault, before the single-phase tripping operation of breaker:
A phase voltages Umfa=-165.85-j 3.7579kV, B phase voltages Umfb=60.379+j 157.27kV
C phase voltages Umfc=105.98j 132.46kV
A phase currents Imfa=0.1139+j 0.48731kA, B phase currents Imfb=-0.079284-j 1.0397kA
C phase currents Imfc=-0.83508+j 0.57169kA
After the single-phase tripping operation of breaker, before reclosing:
A phase voltages Umha=1.6321-j 6.8967kV, B phase voltages Umhb=62.908+j 153.34kV
C phase voltages Umhc=108.51-j 136.39kV
A phase currents Imha=0kA, B phase currents Imhb=0.06361-j 0.9579kA
C phase currents Imhc=-0.69219+j 0.65348kA
By the positive sequence voltage phasor U before single-phase tripping operation after following formula calculating faulty line singlephase earth faultmf1, negative sequence voltage
Phasor Umf2, residual voltage phasor Umf0, forward-order current phasor Imf1, negative-sequence current phasor Imf2, zero-sequence current phasor Imf0, and be
Positive and negative, residual voltage phasor U of the system M sides before single-phase automation reclosing after the single-phase tripping operation in circuit both sidesmh1、Umh2、Umh0
And positive and negative, zero-sequence current phasor Imh1、Imh2、Imh0:
(2) it is calculated:
Positive sequence wave impedance Zc1:
Zero sequence wave impedance Zc0:
Positive sequence propagation coefficient γ1:
Zero sequence propagation coefficient γ0:
By step 1) two voltages at moment being calculated, current sequence components substitute into equation group (1), (2), obtain:
(3) by step 2) in be calculated two groups of sequence voltages of N sides three, electric current phasor Unhy1、Unhy2、Unhy0、Inhy1、Inhy2、
Inhy0And Unhs1、Unhs2、Unhs0、Inhs1、Inhs2、Inhs0Following formula is substituted into, it is permanent earth event to respectively obtain calculating based on failure
Hinder N sides three-phase voltage, the electric current phasor U for assumingnhya、Unhyb、Unhyc、Inhya、Inhyb、Inhyc, and based on failure for instantaneity connects
N sides three-phase voltage, electric current phasor U that earth fault is assumednhsa、Unhsb、Unhsc、Inhsa、Inhsb、Inhsc:
(4) unknown quantity is set:System N sides potentials EN, positive sequence impedance ZN1,ZN0, fault resstance R, trouble point and system M sides it
Between distance account for the percentage x of line length;The relevant parameter that will be measured in step (1)-(4) or be calculated, substitutes into formula
(3) real part imaginary part, and by nonlinear complex equations in (3) is separated, the Nonlinear System of Equations of real number, given system N sides is changed into
Zero sequence impedance ZN0=28.14 ∠ 86.7, are permanent fault using improve Gauss-Newton method method to be calculated hypothesis failure
Under the distance between trouble point and system M sides account for the percentage x of line lengthy=0.49994.
(5) unknown quantity is equally set:System N sides potentials EN, positive sequence impedance ZN1,ZN0, fault resstance R, trouble point and system M
The distance between side accounts for the percentage x of line length;The relevant parameter that will be measured in step (1)-(4) or be calculated, substitutes into
Formula (4), and nonlinear complex equations in (4) are separated into real part imaginary part, change into the Nonlinear System of Equations of real number, given system N
The zero sequence impedance Z of sideN0=28.14 ∠ 86.7, are instantaneity event using improve Gauss-Newton method method to be calculated hypothesis failure
The distance between trouble point and system M sides under barrier account for the percentage x of line lengths=0.50019.
(6) ratio=is calculated | xy-xs| × 100=0.025, instantaneity at advance simulation calculation circuit proximal outlet is passed through
Ratio values when small resistor (10 ohm of value of acquiescence) singlephase earth fault occurs are now actual to count for 0.9818 used as threshold value
Ratio values are calculated for 0.025 is less than threshold value, therefore failure judgement is permanent fault, it is misaligned.
Embodiment two
A kind of traditional transmission system model of 220kV is as shown in figure 1, line length is 100km, line parameter circuit value value such as table 1
It is shown;System M sides potential is 220 ∠, 0 ° of kV;System M sides zero sequence impedance is 26.3 ∠, 90 ° of Ω;Positive sequence impedance is:29.3∠90°
Ω;System N sides potential is 220 ∠, 30 ° of kV;System N sides zero sequence impedance is 28.14 ∠, 86.74 ° of Ω;Positive sequence impedance is:32.0∠
78.4°Ω.System M sides are arranged on using the fault location device of the inventive method, voltage, electric current are respectively from line side voltage
Transformer, current transformer.Simulated fault type is A phase instantaneity earth faults, and failure occurs at system M side 50km,
The Ω of transition resistance 100.
The 220kV transmission line of electricity major parameters of table 1
Comprised the following steps that using the embodiment of the inventive method:
1) in M side systems side, A, B, C the three-phase voltage phasor after measurement faulty line singlephase earth fault before single-phase tripping operation
Umfa、Umfb、UmfcWith electric current phasor Imfa、Imfb、Imfc, and A, B, C the three-phase voltage phasor after single-phase tripping operation before reclosing
Umha、Umhb、UmhcWith electric current phasor Imha、Imhb、ImhcAs input quantity:
After singlephase earth fault, before the single-phase tripping operation of breaker:
A phase voltages Umfa=-165.85-j 3.7579kV, B phase voltages Umfb=60.379+j 157.27kV
C phase voltages Umfc=105.98j 132.46kV
A phase currents Imfa=0.1139+j 0.48731kA, B phase currents Imfb=-0.079284-j 1.0397kA
C phase currents Imfc=-0.83508+j 0.57169kA
After the single-phase tripping operation of breaker, before reclosing:
A phase voltages Umha=24.112-j 2.1296kV, B phase voltages Umhb=62.889+j 153.34kV
C phase voltages Umhc=108.49-j 136.4kV
A phase currents Imha=0kA, B phase currents Imhb=0.063751-j 0.95851kA
C phase currents Imhc=-0.69204+j 0.65287kA
By the positive sequence voltage phasor U before single-phase tripping operation after following formula calculating faulty line singlephase earth faultmf1, negative sequence voltage
Phasor Umf2, residual voltage phasor Umf0, forward-order current phasor Imf1, negative-sequence current phasor Imf2, zero-sequence current phasor Imf0, and be
Positive and negative, residual voltage phasor U of the system M sides before single-phase automation reclosing after the single-phase tripping operation in circuit both sidesmh1、Umh2、Umh0
And positive and negative, zero-sequence current phasor Imh1、Imh2、Imh0:
2) it is calculated:
Positive sequence wave impedance Zc1:
Zero sequence wave impedance Zc0:
Positive sequence propagation coefficient γ1:
Zero sequence propagation coefficient γ0:
By step 1) two voltages at moment being calculated, current sequence components substitute into equation group (1), (2), obtain:
3) by step 2) in be calculated two groups of sequence voltages of N sides three, electric current phasor Unhy1、Unhy2、Unhy0、Inhy1、Inhy2、
Inhy0And Unhs1、Unhs2、Unhs0、Inhs1、Inhs2、Inhs0Following formula is substituted into, it is permanent earth event to respectively obtain calculating based on failure
Hinder N sides three-phase voltage, the electric current phasor U for assumingnhya、Unhyb、Unhyc、Inhya、Inhyb、Inhyc, and based on failure for instantaneity connects
N sides three-phase voltage, electric current phasor U that earth fault is assumednhsa、Unhsb、Unhsc、Inhsa、Inhsb、Inhsc:
4) unknown quantity is set:System N sides potentials EN, positive sequence impedance ZN1,ZN0, fault resstance R, trouble point and system M sides it
Between distance account for the percentage x of line length;The relevant parameter that will be measured in step (1)-(4) or be calculated, substitutes into formula
(3) real part imaginary part, and by nonlinear complex equations in (3) is separated, the Nonlinear System of Equations of real number, given system N sides is changed into
Zero sequence impedance ZN0=28.14 ∠ 86.7, are permanent fault using improve Gauss-Newton method method to be calculated hypothesis failure
Under the distance between trouble point and system M sides account for the percentage x of line lengthy=1.0891.
5) unknown quantity is equally set:System N sides potentials EN, positive sequence impedance ZN1,ZN0, fault resstance R, trouble point and system M
The distance between side accounts for the percentage x of line length;The relevant parameter that will be measured in step (1)-(4) or be calculated, substitutes into
Formula (4), and nonlinear complex equations in (4) are separated into real part imaginary part, change into the Nonlinear System of Equations of real number, given system N
The zero sequence impedance Z of sideN0=28.14 ∠ 86.7, are instantaneity event using improve Gauss-Newton method method to be calculated hypothesis failure
The distance between trouble point and system M sides under barrier account for the percentage x of line lengths=0.50006.
6) ratio=is calculated | xy-xs| × 100=58.904, instantaneity at advance simulation calculation circuit proximal outlet is passed through
Ratio values when small resistor (10 ohm of value of acquiescence) singlephase earth fault occurs are now actual to count for 0.9818 used as threshold value
Ratio values are calculated for 58.904 are much larger than threshold value, therefore failure judgement is transient fault, carries out reclosing.
Claims (1)
1. instantaneous singlephase earth fault self adaptation reclosing determination methods of a kind of transmission line of electricity, it is characterised in that including following step
Suddenly:
(1) defeated hypothesis electric line is M sides, the breaker list after transmission line of electricity either side, measurement faulty line singlephase earth fault
The moment is the three-phase voltage phasor U at moment 1 before mutually trippingmfa、Umfb、UmfcWith three-phase current phasor Imfa、Imfb、Imfc, and survey
The moment is the three-phase voltage phasor U at moment 2 before reclosing after amount failure phase circuit breaker tripmha、Umhb、UmhcAnd electric current phasor
Imha、Imhb、Imhc, above-mentioned measurement is used as input quantity;Above-mentioned two moment corresponding positive sequence, negative phase-sequence, zero sequence are calculated by following formula
Voltage phasor Umf1、Umf2、Umf0With electric current phasor Imf1、Imf2、Imf0, and Umh1、Umh2、Umh0With positive sequence, negative phase-sequence, zero-sequence current
Phasor Imh1、Imh2、Imh0:
Wherein a=ej2π/3;
(2) set up equation and describe the voltage of transmission line of electricity both sides, electricity using step (1) voltage for being calculated, current sequence components
Flow relation, obtains two groups of Nonlinear System of Equations:
Transmission line of electricity both sides voltage-current relationship equation group (1) described under permanent singlephase earth fault are:
Transmission line of electricity both sides voltage-current relationship equation group (2) under description transient single-phase earth fault are:
Wherein Unhy1、Unhy2、Unhy0、Inhy1、Inhy2、Inhy0Represent that moment 2 time assumes failures under permanent singlephase earth fault,
It is the positive sequence voltage of the circuit offside (N sides) being calculated based on equation group (1), negative sequence voltage, residual voltage, forward-order current, negative
Sequence electric current, zero-sequence current phasor;Unhs1、Unhs2、Unhs0、Inhs1、Inhs2、Inhs0Represent that 2 times hypothesis failures of moment are instantaneity list
Under phase earth fault, the positive sequence voltage of the circuit offside (N sides) being calculated based on equation group (2), negative sequence voltage, zero sequence electricity
Pressure, forward-order current, negative-sequence current, zero-sequence current phasor;L is transmission line length, γ1It is positive sequence propagation coefficient:γ0It is zero sequence propagation coefficient:
Zc1It is positive sequence wave impedance:R1、L1、G1、C1Respectively unit length circuit
Positive sequence resistance, inductance, conductance and capacitance;
Zc0It is zero sequence wave impedance:R0、L0、G0、C0Respectively unit length circuit
Zero sequence resistance, inductance, conductance and capacitance;
A is voltage Transfer coefficient matrices, and B is impedance matrix, and C is admittance matrix, and D is electric current Transfer coefficient matrices, is specifically defined
It is as follows:
(3), two groups of sequence voltages of N sides three, electric current phasor U will be calculated in step (2)nhy1、Unhy2、Unhy0、Inhy1、Inhy2、
Inhy0And Unhs1、Unhs2、Unhs0、Inhs1、Inhs2、Inhs0Following formula is substituted into, it is permanent earth event to respectively obtain calculating based on failure
Hinder N sides three-phase voltage, the electric current phasor U for assumingnhya、Unhyb、Unhyc、Inhya、Inhyb、Inhyc, and based on failure for instantaneity connects
N sides three-phase voltage, electric current phasor U that earth fault is assumednhsa、Unhsb、Unhsc、Inhsa、Inhsb、Inhsc:
(4) unknown quantity is set:System N sides potentials EN, positive sequence impedance ZN1,ZN0, fault resstance R, between trouble point and system M sides
Distance accounts for the percentage x of line length;Assuming that failure is permanent singlephase earth fault, equation below group (3) is write out:
Wherein:ZsIt is system side self-impedanceZmIt is system side mutual impedance
The relevant parameter that will be measured in step (1)-(4) or be calculated, is substituted into (3), and nonlinear complex equations in (3) are divided
From real part imaginary part, the Nonlinear System of Equations of real number, the zero sequence impedance Z of given system N sides are changed intoN0, use improved Gauss-ox
Method Levenbery-Marquardt methods are solved, you can must assume failure for the trouble point under permanent fault be
The distance between system M sides account for the percentage x of line lengthy;
(5) assume that failure is transient single-phase earth fault, write out equation below group (4):
The relevant parameter that will be measured in step (1)-(4) or be calculated, is substituted into (4), and nonlinear complex equations in (4) are divided
From real part imaginary part, the Nonlinear System of Equations of real number, the zero sequence impedance Z of given system N sides are changed intoN0, use improved Gauss-ox
Method method of pausing is solved, you can the line is busy for the distance between trouble point and system M sides under transient fault must to assume failure
The percentage x of road lengths;
6) ratio=is defined | xy-xs| × 100, through small resistor, (acquiescence takes instantaneity at advance simulation calculation circuit proximal outlet
10 ohm of value) singlephase earth fault occur when ratio values as threshold value;If the ratio values being actually calculated are less than threshold
Value then judges to there occurs single-phase permanent earth fault, lock-reclosing lock function;Otherwise it is judged as there occurs that single-phase instantaneity connects
Earth fault, implements reclosing.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201710123414.7A CN106908692B (en) | 2017-03-03 | 2017-03-03 | A kind of adaptive reclosing judgment method of transmission line one-phase earth fault |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201710123414.7A CN106908692B (en) | 2017-03-03 | 2017-03-03 | A kind of adaptive reclosing judgment method of transmission line one-phase earth fault |
Publications (2)
Publication Number | Publication Date |
---|---|
CN106908692A true CN106908692A (en) | 2017-06-30 |
CN106908692B CN106908692B (en) | 2019-05-07 |
Family
ID=59186670
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201710123414.7A Active CN106908692B (en) | 2017-03-03 | 2017-03-03 | A kind of adaptive reclosing judgment method of transmission line one-phase earth fault |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN106908692B (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107478958A (en) * | 2017-09-07 | 2017-12-15 | 国家电网公司 | A kind of method for identifying distribution line short circuit permanent fault and transient fault of being discharged using capacitor energy storage |
CN108306251A (en) * | 2018-02-05 | 2018-07-20 | 国网河南省电力公司新乡供电公司 | A kind of reclosing control method, system and a kind of reclosing control device |
CN110829388A (en) * | 2019-11-14 | 2020-02-21 | 国网湖南省电力有限公司 | Single-phase earth fault judgment method and reclosing method of double-fed wind power plant |
CN112578225A (en) * | 2020-12-07 | 2021-03-30 | 广东电网有限责任公司韶关供电局 | Method, device and system for determining single-phase earth fault point |
US11143715B2 (en) * | 2019-08-15 | 2021-10-12 | Schweitzer Engineering Laboratories, Inc. | Broken conductor detection in a multiple-phase electric power delivery system |
Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003222650A (en) * | 2002-01-30 | 2003-08-08 | Tohoku Electric Power Co Inc | Method and system for locating wiring failure point |
CN101242095A (en) * | 2008-02-03 | 2008-08-13 | 西安西瑞保护控制设备有限责任公司 | A permanent failure judgement method for power transmission line with parallel reactor |
CN101247040A (en) * | 2008-02-29 | 2008-08-20 | 西安交通大学 | Permanent fault discrimination method for electric power line with shunt reactor |
WO2011035215A1 (en) * | 2009-09-18 | 2011-03-24 | Schweitzer Engineering Laboratories, Inc. | Electrical power system phase and ground protection using an adaptive quadrilateral characteristic |
US20130329326A1 (en) * | 2009-07-17 | 2013-12-12 | Searete Llc | Systems and methods for grounding power line sections to clear faults |
CN103630798A (en) * | 2013-09-12 | 2014-03-12 | 清华大学 | Transmission line single-phase grounding fault single-end ranging method |
CN103777114A (en) * | 2014-01-26 | 2014-05-07 | 浙江大学 | Method for recognizing single-phase permanent fault of single-ended electric transmission line with paralleling reactor |
CN103809078A (en) * | 2014-01-26 | 2014-05-21 | 浙江大学 | Single-phase permanent fault identification method for electric transmission line with paralleling reactors at two ends of electric transmission line |
CN103954879A (en) * | 2014-05-09 | 2014-07-30 | 浙江大学 | Method for differentiating fault properties of same-rod double-circuit line with paralleling reactor |
CN104198889A (en) * | 2014-09-12 | 2014-12-10 | 清华大学 | Successive action based single-terminal location method for instant ground fault of high-voltage line |
CN105067951A (en) * | 2015-07-27 | 2015-11-18 | 清华大学 | Single-phase earth fault range finding method of T-connection lines based on multi-time-section information |
CN105826907A (en) * | 2016-05-11 | 2016-08-03 | 天津大学 | Three-phase permanent fault judgment method for hybrid power transmission line with shunt reactors |
-
2017
- 2017-03-03 CN CN201710123414.7A patent/CN106908692B/en active Active
Patent Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003222650A (en) * | 2002-01-30 | 2003-08-08 | Tohoku Electric Power Co Inc | Method and system for locating wiring failure point |
CN101242095A (en) * | 2008-02-03 | 2008-08-13 | 西安西瑞保护控制设备有限责任公司 | A permanent failure judgement method for power transmission line with parallel reactor |
CN101247040A (en) * | 2008-02-29 | 2008-08-20 | 西安交通大学 | Permanent fault discrimination method for electric power line with shunt reactor |
US20130329326A1 (en) * | 2009-07-17 | 2013-12-12 | Searete Llc | Systems and methods for grounding power line sections to clear faults |
WO2011035215A1 (en) * | 2009-09-18 | 2011-03-24 | Schweitzer Engineering Laboratories, Inc. | Electrical power system phase and ground protection using an adaptive quadrilateral characteristic |
CN103630798A (en) * | 2013-09-12 | 2014-03-12 | 清华大学 | Transmission line single-phase grounding fault single-end ranging method |
CN103777114A (en) * | 2014-01-26 | 2014-05-07 | 浙江大学 | Method for recognizing single-phase permanent fault of single-ended electric transmission line with paralleling reactor |
CN103809078A (en) * | 2014-01-26 | 2014-05-21 | 浙江大学 | Single-phase permanent fault identification method for electric transmission line with paralleling reactors at two ends of electric transmission line |
CN103954879A (en) * | 2014-05-09 | 2014-07-30 | 浙江大学 | Method for differentiating fault properties of same-rod double-circuit line with paralleling reactor |
CN104198889A (en) * | 2014-09-12 | 2014-12-10 | 清华大学 | Successive action based single-terminal location method for instant ground fault of high-voltage line |
CN105067951A (en) * | 2015-07-27 | 2015-11-18 | 清华大学 | Single-phase earth fault range finding method of T-connection lines based on multi-time-section information |
CN105826907A (en) * | 2016-05-11 | 2016-08-03 | 天津大学 | Three-phase permanent fault judgment method for hybrid power transmission line with shunt reactors |
Non-Patent Citations (1)
Title |
---|
耿建昭等: "利用单相跳闸后信息的输电线路单相接地单端精确测距方法", 《电工技术学报》 * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107478958A (en) * | 2017-09-07 | 2017-12-15 | 国家电网公司 | A kind of method for identifying distribution line short circuit permanent fault and transient fault of being discharged using capacitor energy storage |
CN108306251A (en) * | 2018-02-05 | 2018-07-20 | 国网河南省电力公司新乡供电公司 | A kind of reclosing control method, system and a kind of reclosing control device |
US11143715B2 (en) * | 2019-08-15 | 2021-10-12 | Schweitzer Engineering Laboratories, Inc. | Broken conductor detection in a multiple-phase electric power delivery system |
CN110829388A (en) * | 2019-11-14 | 2020-02-21 | 国网湖南省电力有限公司 | Single-phase earth fault judgment method and reclosing method of double-fed wind power plant |
CN110829388B (en) * | 2019-11-14 | 2021-10-26 | 国网湖南省电力有限公司 | Single-phase earth fault judgment method and reclosing method of double-fed wind power plant |
CN112578225A (en) * | 2020-12-07 | 2021-03-30 | 广东电网有限责任公司韶关供电局 | Method, device and system for determining single-phase earth fault point |
Also Published As
Publication number | Publication date |
---|---|
CN106908692B (en) | 2019-05-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN106908692A (en) | A kind of transmission line one-phase earth fault self adaptation reclosing determination methods | |
Liao et al. | Online optimal transmission line parameter estimation for relaying applications | |
Zheng et al. | A transient protection scheme for HVDC transmission line | |
CN102200563B (en) | Line single-phase earth fault single-terminal ranging method based on positioning function amplitude characteristics | |
CN100580470C (en) | Phase amount and zero sequence amount combined realization powerline both-end distance measuring method | |
CN105548819A (en) | High-voltage direct current transmission line internal fault and external fault identification method based on backward traveling waves | |
US20120095707A1 (en) | Method for Identifying Type of Fault on Power Line | |
CN105425109A (en) | Single-phase ground line selection method with function of accuracy improvement for small-current grounding system | |
CN102129014B (en) | Method for realizing line phase-to-phase fault single-end distance measurement by utilizing distribution parameter model | |
CN102590654B (en) | Element and method for discriminating fault electrode of DC transmission line | |
CN102129011B (en) | Single-ended interphase fault location method for distributed capacitance current and fault resistance resistant line | |
CN106501675B (en) | The wind farm grid-connected instantaneous singlephase earth fault method of single end distance measurement of transmission line of electricity | |
CN106385012B (en) | Feeder zero sequence current protection method and device | |
CN107315128A (en) | A kind of distributed earthing wire-selecting method and system based on GOOSE | |
CN105929302A (en) | Sequence component relation based range finding method for single-end fault of power transmission line | |
CN106655121A (en) | Low-impedance adaptive protection method of micro-grid bus | |
CN109100605A (en) | Utilize the single end positioning method of the high-tension cable singlephase earth fault of failure boundary condition | |
CN104198889B (en) | Successive action based single-terminal location method for instant ground fault of high-voltage line | |
CN107818202A (en) | A kind of intelligent substation isolator operation electromagnetic disturbance characteristic analysis method | |
Taheri et al. | Single-end current-based algorithm for fault location in series capacitor compensated transmission lines | |
CN105842582B (en) | Flexible direct current circuit fault distance measurement based on EMTR | |
CN107508265A (en) | Small resistance grounding system high resistance earthing protecting method and system | |
CN104505813B (en) | A kind of electric transmission line longitudinal protection method for carrying out Simulation after test using instantaneous power under Bei Jielong circuit models | |
CN106253244A (en) | A kind of based on electric current from the sense of current longitudinal protection method of structure reference quantity | |
CN104237677A (en) | Zero-sequence parameter on-line identification method for 200 kV or more single-circuit power transmission lines |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
GR01 | Patent grant | ||
GR01 | Patent grant |