CN107942197A  A kind of transmission line of electricity oneend fault ranging method  Google Patents
A kind of transmission line of electricity oneend fault ranging method Download PDFInfo
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 CN107942197A CN107942197A CN201711148506.7A CN201711148506A CN107942197A CN 107942197 A CN107942197 A CN 107942197A CN 201711148506 A CN201711148506 A CN 201711148506A CN 107942197 A CN107942197 A CN 107942197A
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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

 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
 G01R31/50—Testing of electric apparatus, lines, cables or components for shortcircuits, continuity, leakage current or incorrect line connections
Abstract
The invention discloses a kind of transmission line of electricity oneend fault ranging method, the fault distancefinding method passes through phase component method, it is in quadratic function to set transmission line of electricity voltage change, and short circuit trouble point voltage and short circuit trouble point are calculated to the distance of head end by known transmission line of electricity head end voltage, electric current and unit impedometer.Short circuit trouble point can accurately be calculated when symmetrical shortcircuit and asymmetry short circuit fault occurs to diverse location in electric system, and range accuracy is high, can also accurately calculate the distant short dot distance of phenomenon of the failure.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System field, and in particular to a kind of transmission line of electricity oneend fault ranging side
Method.
Background technology
The electrical energy production and consumption system that electric system is made of links such as power generation, power transformation, transmission of electricity, distribution and electricity consumptions.
Its function is that the primary energy of nature is changed into electric energy by generation power device, then through defeated, transformer substation system and distribution
System supplies power to each load center, by various equipment reconverts into various forms of energy such as power, heat, light, is
Regional economy and people's lives service.But anything, all there are dual character, electric energy is also the same, if carried out to electric energy
Maloperation life or even life that either the electric power system fault as caused by external condition can be to user, staff cause
Serious threat.The size of short circuit current flow depends on electrical distance of the short dot away from power supply, for example, occurring in generator end short
Lu Shi, flows through the short circuit current flow maximum instantaneous value of generator up to 10~15 times of the rated current of generator, in the electricity of large capacity
In Force system, short circuit current flow may be up to tens thousand of amperes.Short circuit current flow will cause following serious consequence：Short circuit current flow often has
Electric arc produces, it can not only burn out fault element in itself, it is also possible to burns out surrounding devices and injury surrounding people.Huge is short
When road electric current passes through conductor, on the one hand conductor can be made largely to generate heat, cause conductor overheat or even melt, and insulation damages；Separately
On the one hand huge short circuit current flow will also produce very big electrodynamic action in conductor, conductor is deformed or is damaged.Short circuit is also same
Shi Yinqi system voltages are greatly lowered, and reduce more especially proximate to the voltage of shortcircuit point, so as to cause part
The power supply of user or whole users are destroyed.The reduction of network voltage, makes the normal work of power supply unit be damaged,
It may cause the product rejection or equipment damage of factory, such as motor overheating is damaged.Occurs short trouble in electric system
When, the suddenly change of system power distribution and the degradation of voltage may destroy the stability of each power plant parallel running,
Make whole system offtheline, at this moment the possible overload of some generators, therefore, it is necessary to cutout user.Voltage declines when shortcircuit
It is bigger, the duration is longer, and the possibility for destroying whole power system stability operation is bigger.
Wherein more serious electric power system fault is exactly the short circuit problem of electric system, from the actual motion of electric system
Situation sees, electric power system fault majority be as caused by short circuit, it is therefore one more deep except having to the short trouble of electric system
Understanding outside, it is necessary to the skilled shortcircuit ranging for grasping electric system calculates.In threephase system, it may occur however that short circuit have：
Threephase shortcircuit, line to line fault, line to line fault ground connection and singleline to ground fault.Therefore often occur on electric system power transmission line
Various short troubles, in trouble point, some phenomena of the failure are obvious, relatively good identification, and then phenomenon is less obvious for some failures,
Such as when singlephase earth fault occurs for isolated neutral system, since earth current is small, so the infringement caused by trouble point
Small, after protection cuts off this failure, trouble point is sometimes difficult to search, but this trouble point has occurred and that change due to insulating,
It is weaker for relatively whole circuit, it seem likely that being the spot of failure next time, therefore, there is still a need for looking for as early as possible
Arrive.For a long time, since fault localization precision is relatively low, the faulty line service restoration time is not only have impact on, is also run to circuit
Maintenance personnel's line inspection brings heavy burden.
The content of the invention
The technical problems to be solved by the invention are that existing fault localization precision is relatively low, not only have impact on faulty line power supply
Recovery time, also brings heavy burden to circuit operation maintenance personnel's line inspection, particularly with the distant feelings of phenomenon of the failure
Condition, trouble point is difficult to search, and it is an object of the present invention to provide a kind of transmission line of electricity oneend fault ranging method, to different in electric system
Position occurs that short circuit trouble point can accurately be calculated when symmetrical shortcircuit and asymmetry short circuit fault, and range accuracy is high, also may be used
To accurately calculate the distant short dot distance of phenomenon of the failure.
The present invention is achieved through the following technical solutions：
A kind of transmission line of electricity oneend fault ranging method, the fault distancefinding method set power transmission line by phase component method
Road voltage change is in quadratic function, and short circuit trouble point electricity is calculated by known transmission line of electricity head end voltage, electric current and unit impedometer
The distance of pressure and short circuit trouble point to head end.
The present invention is based on phase component method, in the case of known transmission line of electricity head end voltage, electric current and unit impedance, only needs
The voltage of short circuit trouble point is found, short dot then can be obtained by order components to the distance of head end.For failure electricity
Pressure, due to there are the influence of transition resistance etc., so needing to search out short dot voltage from head end, due to short dot voltage
It is minimum voltage, so the voltage found out can show similar quadratic function, present invention setting transmission line of electricity voltage change is in two
Secondary function, then quadratic function can be fault point voltage there are minimum point, thus can obtain trouble point to head end away from
From.Short trouble can accurately be calculated when symmetrical shortcircuit and asymmetry short circuit fault occurs to diverse location in electric system
Point, and range accuracy is high, can also accurately calculate the distant short dot distance of phenomenon of the failure.
Preferably, the fault distancefinding method is for the singleline to ground fault in threephase system, twophase grounding fault, twophase
Phase fault and threephase shortcircuit situation.
Improper connection (short circuit) occurs between phase and phase or between phase and ground (or neutral conductor) in operation for electric system
When the electric current that flows through be known as short circuit current flow.Occur in threephase system short circuit fundamental type have threephase shortcircuit, line to line fault,
Onephase shortcircuit current and two relative ground circuits.Threephase circuit when threephase shortcircuit is because of short circuit remains symmetrical, therefore is known as symmetrical
Short circuit；Other several short circuits make threephase circuit asymmetric, therefore referred to as unsymmetrical shortcircuit.In the power grid of neutralpoint solid ground
In, it is most using a short trouble relatively, accounts for the 90% of whole short troubles.In the electricity of neutral point indirect earthing
In power network, short trouble is mainly various phase faults.When generation is shortcircuit, due to power supply current supply circuit impedance reduction with
And transient process during suddenlyapplied short circuit, the electric current in shortcircuit loop is greatly increased, can exceed that the rated current in circuit is many
Times.Therefore selection calculates singleline to ground fault, twophase grounding fault, twophase phase fault and the threephase shortcircuit in threephase system
In the case of fault distance there is important actual application value.
Preferably, in the case of the singleline to ground fault, fault localization calculation formula is：
Wherein,It is the phase voltage of the head end of A phases,It is the phase voltage of the head end of B phases,It is the phase of the head end of C phases
Voltage,It is A phase short dot voltages,It is A phase phase currents,It is B phase phase currents,It is C phase phase currents, Z_{L}It is head end
To the unit impedance of short dot, Z_{L1}、Z_{L2}、Z_{L0}Represent positive sequence impedance, negative sequence impedance and zero sequence impedance successively respectively, L is two first
The distance between end, a operators, X is distance of the head end to short dot.
Calculating derivation is：
Due to
A phase phase voltages are just divided into positive sequence voltage firstNegative sequence voltageAnd residual voltage
And because
A phase phase currents are just divided into forwardorder currentNegativesequence currentAnd zerosequence current
There is Z again_{L}=Z_{L1}+Z_{L2}+Z_{L0} (13)
A phase phase of impedance is just divided into positive sequence impedance Z_{L1}, negative sequence impedance Z_{L2}And zero sequence impedance
Finally have
The voltage of A phase short dots is divided into positive sequence shortcircuit voltageNegative phasesequence shortcircuit voltageWith zero sequence short circuit electricity
Pressure
The derivation of equation：
Following formula is obtained according to the phase current of shortcircuit phase in threephase circuit and the relation of every phase phase current：
According to the circuit of each order components.It is recognized that the positive negative zero of positive and negative the zerosequence component voltage and head end of short dot
The equation that order components phase voltage and the positive negative zero of line impedance are formed with the positive negative zero of electric current.Then there is following formula：
It can be obtained by above equation：
Three above formula, which is added, to be obtained：
Finally being arranged by (21) and (24) to obtain：
Finally obtainWith X relational expressions, then according to quadratic function models, unit is passed through according to head end voltage and phase current
The minimum voltage found out between two head ends of impedance, that is,Last foundation formula (115) can be in the hope of short dot to head
The distance X at end.
Preferably, in the case of the twophase grounding fault, fault localization calculation formula is：
Wherein,It is the phase voltage of the head end of A phases,It is the phase voltage of the head end of B phases,It is the phase of the head end of C phases
Voltage,It is short dot voltage,It is A phase phase currents,It is B phase phase currents,It is C phase phase currents, Z_{L}
It is unit impedance of the head end to short dot, Z_{L1}、Z_{L2}、Z_{L0}Represent positive sequence impedance, negative sequence impedance and zero sequence impedance, L successively respectively
It is the distance between two head ends, a operators, X is distance of the head end to short dot.
Derivation is：
Due to
A phase phase voltages are just divided into positive sequence voltage firstNegative sequence voltageAnd residual voltage
And because
A phase phase currents are just divided into forwardorder currentNegativesequence currentAnd zerosequence current
Finally have
The voltage of B phase short dots is divided into positive sequence shortcircuit voltageNegative phasesequence shortcircuit voltageWith zero sequence short circuit electricity
Pressure
And because
B phase phase currents are just divided into forwardorder currentNegativesequence currentAnd zerosequence current
There is Z again_{L}=Z_{L1}+Z_{L2}+Z_{L0} (25)
Then since A phases with B phases have common short dot, then impedance is all divided into positive sequence impedance Z_{L1}, negative sequence impedance Z_{L2}With
Zero sequence impedance Z_{L0}
Finally because being that AB twophase grounding faults have common short dot then to release：
The voltage of AB line to line fault point is divided into positive sequence shortcircuit voltageWithNegative phasesequence shortcircuit voltageWithZero sequence shortcircuit voltageWith
The derivation of equation:
, with obtaining following formula per the relation of phase phase current, it is A phases first according to the phase current of shortcircuit phase in threephase circuit
Relational expression：
Similarly, then it can show that the relation formula of the shortcircuit order components electric current of B phases and every phase is as follows：
According to the circuit of each order components.It is recognized that the positive negative zero of positive and negative the zerosequence component voltage and head end of short dot
The equation that order components phase voltage and the positive negative zero of line impedance are formed with the positive negative zero of electric current.Be first A phases positive and negative zero sequence it is each
The relation of parameter.
Followed by the relation of the positive and negative zero sequence parameters of B phases.
It can be obtained by the various relational expressions of A phases：
Then arrangement identical with singlephase short circuit can obtain：
Then can be obtained by the relation formula of the parameters of B phases：
Arranged and can be obtained by same A phases：
Because：(26) therefore：Twophase is added and can be obtained by short dot voltageWith distance X relations
Merge：
Arrange：
：
Finally obtainWith X relational expressions, then according to quadratic function models, unit is passed through according to head end voltage and phase current
The minimum voltage found out between two head ends of impedance, that is,Last foundation formula (230) can be in the hope of short dot to head
The distance X at end.
Preferably, in the case of the twophase phase fault, fault localization calculation formula is：
Wherein,It is the phase voltage of the head end of A phases,It is the phase voltage of the head end of B phases,It is the phase of the head end of C phases
Voltage,It is A phase phase currents,It is B phase phase currents,It is C phase phase currents, Z_{L}It is unit impedance of the head end to short dot,
Z_{L1}、Z_{L2}、Z_{L0}Represent positive sequence impedance, negative sequence impedance and zero sequence impedance successively respectively, L is the distance between two head ends, a computings
Son, X are distance of the head end to short dot.
Derivation is：
Due to
A phase phase voltages are just divided into positive sequence voltage firstNegative sequence voltageAnd residual voltage
And because
A phase phase currents are just divided into forwardorder currentNegativesequence currentAnd zerosequence current
Finally have
C phase phase voltages are divided into positive sequence voltageNegative sequence voltageAnd residual voltage
And because
C phase phase currents are just divided into forwardorder currentNegativesequence currentAnd zerosequence current
There is Z again_{L}=Z_{L1}+Z_{L2}+Z_{L0} (35)
Then since the short dot of AC phases, then impedance are all divided into positive sequence impedance Z_{L1}, negative sequence impedance Z_{L2}With zero sequence impedance Z_{L0}
Finally because being that AC twophase phase faults have common short dot then to release：
The derivation of equation:
, with obtaining following formula per the relation of phase phase current, it is A phases first according to the phase current of shortcircuit phase in threephase circuit
Relational expression：
Similarly, then it can show that the relation formula of the shortcircuit order components electric current of C phases and every phase is as follows：
According to the circuit of each order components.It is recognized that the positive negative zero of positive and negative the zerosequence component voltage and head end of short dot
The equation that order components phase voltage and the positive negative zero of line impedance are formed with the positive negative zero of electric current.Be first A phases positive and negative zero sequence it is each
The relation of parameter.
Followed by the relation of the positive and negative zero sequence parameters of C phases.
It can be obtained by the various relational expressions of A phases：
Derived by the parameter of A phases
Then can be obtained by the various relational expressions of C phases：
Similarly being arranged with A phases to obtain：
AB twophases are added, principle is as twophase grounding fault, so being obtained after arranging：
The formula (327) is head end phase voltage and the relational expression of X, it is possible to can by head end voltage and phase current
Directly the distance X of short dot to head end is obtained.
Preferably, in the case of the threephase shortcircuit, fault localization calculation formula is：
Wherein,It is the phase voltage of the head end of A phases,It is the phase voltage of the head end of B phases,It is the phase of the head end of C phases
Voltage,It is A phase phase currents,It is B phase phase currents,It is C phase phase currents, Z_{L}It is unit impedance of the head end to short dot,
Z_{L1}、Z_{L2}、Z_{L0}Represent positive sequence impedance, negative sequence impedance and zero sequence impedance successively respectively, L is the distance between two head ends, a computings
Son, X are distance of the head end to short dot.
Derivation is：
Due to
A phase phase voltages are just divided into positive sequence voltage firstNegative sequence voltageAnd residual voltage
And because
A phase phase currents are just divided into forwardorder currentNegativesequence currentAnd zerosequence current
Then have
B phase phase voltages are divided into positive sequence voltageNegative sequence voltageAnd residual voltage
And because
B phase phase currents are just divided into forwardorder currentNegativesequence currentAnd zerosequence current
Finally have
C phase phase voltages are divided into positive sequence voltageNegative sequence voltageAnd residual voltage
And because
C phase phase currents are just divided into forwardorder currentNegativesequence currentAnd zerosequence current
There is Z again_{L}=Z_{L1}+Z_{L2}+Z_{L0} (47)
Then since ABC threephases have common short dot, then impedance is all divided into positive sequence impedance Z_{L1}, negative sequence impedance Z_{L2}With
Zero sequence impedance Z_{L0}
Finally because being that ABCA threephase shortcircuits have common short dot then to release：
The derivation of equation:
, with obtaining following formula per the relation of phase phase current, it is A phases first according to the phase current of shortcircuit phase in threephase circuit
Relational expression：
Similarly, then it can show that the relation formula of the shortcircuit order components electric current of B phases and every phase is as follows：
Similarly, then it can show that the relation formula of the shortcircuit order components electric current of C phases and every phase is as follows：
According to the circuit of each order components.It is recognized that the positive negative zero of positive and negative the zerosequence component voltage and head end of short dot
The equation that order components phase voltage and the positive negative zero of line impedance are formed with the positive negative zero of electric current.Be first A phases positive and negative zero sequence it is each
The relation of parameter.
Followed by the relation of the positive and negative zero sequence parameters of B phases.
It is finally the relation of the positive and negative zero sequence parameters of C phases.
The unknown quantity of each formula is calculated, can be obtained by the various relational expressions of A phases：
Derived by the parameter of A phases
Then can be obtained by the various relational expressions of C phases：
Similarly being arranged with A phases to obtain：
Then can be obtained by the various relational expressions of C phases：
Similarly being arranged with A phases to obtain：
ABC twophases are added, principle is as twophase phase fault, so being obtained after arranging：
The formula (439) is head end phase voltage and the relational expression of X, it is possible to can by head end voltage and phase current
Directly the distance X of short dot to head end is obtained.
Compared with prior art, the present invention have the following advantages and advantages：
The invention discloses a kind of transmission line of electricity oneend fault ranging method, and symmetrical shortcircuit occurs to diverse location in system
With can accurately measure and calculate short circuit trouble point during asymmetry short circuit fault.Four kinds of common typical shortcircuits of threephase circuit
Failure, such as singleline to ground fault, twophase grounding fault, twophase phase fault and threephase shortcircuit, the short circuit event different to these types
Computational methods, calculating process and the result of calculation of barrier point are described in detail, finally also to these four typical short circuit events
Barrier has made system emulation, so that fault location technology is more accurate.And line walking burden can be mitigated, accelerate circuit and recover
Power supply, reduce because power failure and caused by mixed economy lose.
Brief description of the drawings
Attached drawing described herein is used for providing further understanding the embodiment of the present invention, forms one of the application
Point, do not form the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is singlephase earth fault model structure schematic diagram of the present invention；
Fig. 2 is twophase grounding fault model structure schematic diagram of the present invention；
Fig. 3 is twophase phase fault model structure schematic diagram of the present invention；
Fig. 4 is threephase shortcircuit model structure schematic diagram of the present invention；
Fig. 5 is simulation system structure diagram of the present invention；
Fig. 6 is singlephase earth fault simulation result figure of the present invention；
Fig. 7 is double earthfault ranging simulation result figure of the present invention.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and attached drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation are only used for explaining the present invention, do not make
For limitation of the invention.
Embodiment 1
The present invention provides a kind of transmission line of electricity oneend fault ranging method, the fault distancefinding method passes through order components
Method, setting transmission line of electricity voltage change is in quadratic function, by known transmission line of electricity head end voltage, electric current and unit impedance computation
Go out short circuit trouble point voltage and short circuit trouble point to the distance of head end.The fault distancefinding method is used for the list in threephase system
Phase ground short circuit, twophase grounding fault, twophase phase fault and threephase shortcircuit situation.
(1) in the case of the singleline to ground fault, singlephase grounding fault model is as shown in Figure 1, fault localization calculates
Formula is：
Wherein,It is the phase voltage of the head end of A phases,It is the phase voltage of the head end of B phases,It is the phase of the head end of C phases
Voltage,It is A phase short dot voltages,It is A phase phase currents,It is B phase phase currents,It is C phase phase currents, Z_{L}It is head end
To the unit impedance of short dot, Z_{L1}、Z_{L2}、Z_{L0}Represent positive sequence impedance, negative sequence impedance and zero sequence impedance successively respectively, L is two first
The distance between end, a operators, X is distance of the head end to short dot.
(2) in the case of the twophase grounding fault, twophase short circuit and ground fault model is as shown in Fig. 2, fault localization calculates
Formula is：
Wherein,It is the phase voltage of the head end of A phases,It is the phase voltage of the head end of B phases,It is the phase of the head end of C phases
Voltage,It is short dot voltage,It is A phase phase currents,It is B phase phase currents,It is C phase phase currents, Z_{L}
It is unit impedance of the head end to short dot, Z_{L1}、Z_{L2}、Z_{L0}Represent positive sequence impedance, negative sequence impedance and zero sequence impedance, L successively respectively
It is the distance between two head ends, a operators, X is distance of the head end to short dot.
(3), in the case of the twophase phase fault, twophase phase fault model is as shown in figure 3, fault localization meter
Calculating formula is：
Wherein,It is the phase voltage of the head end of A phases,It is the phase voltage of the head end of B phases,It is the phase of the head end of C phases
Voltage,It is A phase phase currents,It is B phase phase currents,It is C phase phase currents, Z_{L}It is unit impedance of the head end to short dot,
Z_{L1}、Z_{L2}、Z_{L0}Represent positive sequence impedance, negative sequence impedance and zero sequence impedance successively respectively, L is the distance between two head ends, a computings
Son, X are distance of the head end to short dot.
(4), in the case of the threephase shortcircuit, three phase short circuit fault model is as shown in figure 4, fault localization calculation formula is：
Wherein,It is the phase voltage of the head end of A phases,It is the phase voltage of the head end of B phases,It is the phase of the head end of C phases
Voltage,It is A phase phase currents,It is B phase phase currents,It is C phase phase currents, Z_{L}It is unit impedance of the head end to short dot,
Z_{L1}、Z_{L2}、Z_{L0}Represent positive sequence impedance, negative sequence impedance and zero sequence impedance successively respectively, L is the distance between two head ends, a computings
Son, X are distance of the head end to short dot.
Embodiment 2
Based on embodiment 1, pass through the accuracy of analogue simulation oneend fault ranging：
(1) simulation model is established as shown in figure 5, including distributed parameter line module, system power supply module, threephase electricity is short out
Road faulty generators element and threephase voltagecurrent detection module.
For distributed parameter line module：Be on the parameter R, L, C of circuit it is equally distributed along circuit, generally cannot be as
The function of lumpedparameter element processing, some parameters or frequency.Power frequency positive sequence, zero sequence are only needed when research short circuit and trend
Parameter, they can find from handbook, or calculate.MATLAB simulation toolboxes provide the two of electric line
Kind of mathematical model, is the towering type chain model of lumped parameter and distributed constant Bei Jielong mathematical models respectively, the present invention using point
Cloth parameter Bei Jielong mathematical models.
For system power supply module：Singleended transmission line of electricity is the intermediate link of electric transmission network, is split according to electric network and managed
By theoretical with equivalent substitution, can by singleended transmission line of electricity it is discrete from whole network be out prominent principal element, will be singleended defeated
The parameter of electric line turns to the threephase voltage source of infinitely great capacity.Socalled infinite large copacity power supply refers to the electricity that internal impedance is zero
Source.When it is zero that the internal resistance of source, which resists, changed regardless of the electric current confessed, power source internal does not produce pressure drop, on power source bus
Output voltage remain unchanged.The capacity of practical power can not possibly be infinitely great, and unlimited large capacity mentioned here is a opposite
Capacity.
For threephase circuit short trouble generator element：It is special being built to earth point of MATLABI tool case offers
The realization means of mould, can select failure phase, trouble point resistance, failure to be mutually grounded, conversion time by the setting to its parameter
With measurement etc..
The present embodiment is emulated primarily directed to singlephase grounding fault and twophase short circuit and ground fault, detects both feelings
The accuracy of abovementioned calculation formula under condition.Because the number that this difference occurs is most.Especially singlephase grounding fault,
More than 80 percent is accounted in short trouble, therefore using oneend fault ranging as analogue simulation ranging emphasis.
(2) simulation calculation step：
By taking singlephase earth fault, double earthfault ranging as an example, after establishing singleended transmission line malfunction model, emulation
Calculation procedure is as follows：
Step 21, sets trouble point every 2km on the line, and fault resstance takes 20,100 and 500 respectively；
Step 22, according to the fault condition of setting, emulates to obtain circuit first, last both ends after failure occurs using MATLAB
The asynchronous phasor of threephase voltage, electric current；
Step 23, using symmetrical component method calculate be out of order after line oneend zero, positive and negative sequence component；
Step 24, is substituted into the relational expression of formula singlephase earth fault distance, asks for fault distance；
Step 24, range error are calculated as follows：
Range error=(calculating one physical fault distance of fault distance)/total line length * 100%.
(3) simulation result：
First, singlephase ground fault distance measuring simulation result is as shown in Fig. 6, table 1~3：
1 singlephase ground fault distance measuring result of table (transition resistance is 20 ohm)
2 singlephase ground fault distance measuring result of table (transition resistance is 100 ohm)
3 singlephase ground fault distance measuring result of table (transition resistance is 100 ohm)
Next is double earthfault ranging simulation result as shown in Fig. 7 and table 4：
Abovedescribed embodiment, has carried out the purpose of the present invention, technical solution and beneficial effect further
Describe in detail, it should be understood that the foregoing is merely the embodiment of the present invention, be not used to limit this hair
Bright protection domain, within the spirit and principles of the invention, any modification, equivalent substitution, improvement and etc. done should all
Within protection scope of the present invention.
Claims (6)
 A kind of 1. transmission line of electricity oneend fault ranging method, it is characterised in that the fault distancefinding method by phase component method, if It is in quadratic function to determine transmission line of electricity voltage change, and short circuit is calculated by known transmission line of electricity head end voltage, electric current and unit impedometer The distance of fault point voltage and short circuit trouble point to head end.
 A kind of 2. transmission line of electricity oneend fault ranging method according to claim 1, it is characterised in that the fault localization Method is used for singleline to ground fault, twophase grounding fault, twophase phase fault and threephase shortcircuit situation in threephase system.
 A kind of 3. transmission line of electricity oneend fault ranging method according to claim 2, it is characterised in that the singlephase earthing Under shortcircuit conditions, fault localization calculation formula is：<mrow> <msub> <mover> <mi>U</mi> <mo>&CenterDot;</mo> </mover> <mrow> <mi>A</mi> <mi>X</mi> </mrow> </msub> <mo>=</mo> <msub> <mover> <mi>U</mi> <mo>&CenterDot;</mo> </mover> <mi>A</mi> </msub> <mo></mo> <mfrac> <mn>1</mn> <mn>3</mn> </mfrac> <mi>X</mi> <mo>&lsqb;</mo> <mrow> <mo>(</mo> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>A</mi> </msub> <mo>+</mo> <mi>a</mi> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>B</mi> </msub> <mo>+</mo> <msup> <mi>a</mi> <mn>2</mn> </msup> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>C</mi> </msub> <mo>)</mo> </mrow> <msub> <mi>Z</mi> <mrow> <mi>L</mi> <mn>1</mn> </mrow> </msub> <mo>+</mo> <mrow> <mo>(</mo> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>A</mi> </msub> <mo>+</mo> <msup> <mi>a</mi> <mn>2</mn> </msup> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>B</mi> </msub> <mo>+</mo> <mi>a</mi> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>C</mi> </msub> <mo>)</mo> </mrow> <msub> <mi>Z</mi> <mrow> <mi>L</mi> <mn>2</mn> </mrow> </msub> <mo>+</mo> <mrow> <mo>(</mo> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>A</mi> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>B</mi> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>C</mi> </msub> <mo>)</mo> </mrow> <msub> <mi>Z</mi> <mrow> <mi>L</mi> <mn>0</mn> </mrow> </msub> <mo>&rsqb;</mo> </mrow>Wherein,It is the phase voltage of the head end of A phases,It is the phase voltage of the head end of B phases,It is the phase voltage of the head end of C phases,It is A phase short dot voltages,It is A phase phase currents,It is B phase phase currents,It is C phase phase currents, Z_{L}It is head end to short dot Unit impedance, Z_{L1}、Z_{L2}、Z_{L0}Represent positive sequence impedance, negative sequence impedance and zero sequence impedance successively respectively, L be between two head ends away from From a operators, X is distance of the head end to short dot.
 A kind of 4. transmission line of electricity oneend fault ranging method according to claim 1, it is characterised in that the two phase ground Under shortcircuit conditions, fault localization calculation formula is：<mrow> <msub> <mover> <mi>U</mi> <mo>&CenterDot;</mo> </mover> <mi>X</mi> </msub> <mo>=</mo> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> <mo>{</mo> <msub> <mover> <mi>U</mi> <mo>&CenterDot;</mo> </mover> <mi>A</mi> </msub> <mo>+</mo> <msub> <mover> <mi>U</mi> <mo>&CenterDot;</mo> </mover> <mi>B</mi> </msub> <mo>+</mo> <mfrac> <mn>1</mn> <mn>3</mn> </mfrac> <mi>X</mi> <mo>&lsqb;</mo> <mrow> <mo>(</mo> <mi>a</mi> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>A</mi> </msub> <mo>+</mo> <msup> <mi>a</mi> <mn>2</mn> </msup> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>B</mi> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>C</mi> </msub> <mo>)</mo> </mrow> <msub> <mi>Z</mi> <mrow> <mi>L</mi> <mn>1</mn> </mrow> </msub> <mo>+</mo> <mrow> <mo>(</mo> <msup> <mi>a</mi> <mn>2</mn> </msup> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>A</mi> </msub> <mo>+</mo> <mi>a</mi> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>B</mi> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>C</mi> </msub> <mo>)</mo> </mrow> <msub> <mi>Z</mi> <mrow> <mi>L</mi> <mn>2</mn> </mrow> </msub> <mo></mo> <mn>2</mn> <mrow> <mo>(</mo> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>A</mi> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>B</mi> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>C</mi> </msub> <mo>)</mo> </mrow> <msub> <mi>Z</mi> <mrow> <mi>L</mi> <mn>0</mn> </mrow> </msub> <mo>&rsqb;</mo> <mo>}</mo> </mrow>Wherein,It is the phase voltage of the head end of A phases,It is the phase voltage of the head end of B phases,It is the phase voltage of the head end of C phases,It is short dot voltage,It is A phase phase currents,It is B phase phase currents,It is C phase phase currents, Z_{L}It is head end To the unit impedance of short dot, Z_{L1}、Z_{L2}、Z_{L0}Represent that positive sequence impedance, negative sequence impedance and zero sequence impedance, L are two head ends successively respectively The distance between, a operators, X is distance of the head end to short dot.
 5. a kind of transmission line of electricity oneend fault ranging method according to claim 1, it is characterised in that the twophase is alternate Under shortcircuit conditions, fault localization calculation formula is：<mrow> <msub> <mover> <mi>U</mi> <mo>&CenterDot;</mo> </mover> <mi>A</mi> </msub> <mo>+</mo> <msub> <mover> <mi>U</mi> <mo>&CenterDot;</mo> </mover> <mi>C</mi> </msub> <mo>=</mo> <mfrac> <mn>1</mn> <mn>3</mn> </mfrac> <mi>X</mi> <mo>&lsqb;</mo> <mrow> <mo>(</mo> <mi>a</mi> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>A</mi> </msub> <mo>+</mo> <msup> <mi>a</mi> <mn>2</mn> </msup> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>C</mi> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>B</mi> </msub> <mo>)</mo> </mrow> <msub> <mi>Z</mi> <mrow> <mi>L</mi> <mn>1</mn> </mrow> </msub> <mo>+</mo> <mrow> <mo>(</mo> <msup> <mi>a</mi> <mn>2</mn> </msup> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>A</mi> </msub> <mo>+</mo> <mi>a</mi> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>C</mi> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>B</mi> </msub> <mo>)</mo> </mrow> <msub> <mi>Z</mi> <mrow> <mi>L</mi> <mn>2</mn> </mrow> </msub> <mo></mo> <mn>2</mn> <mrow> <mo>(</mo> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>A</mi> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>B</mi> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>C</mi> </msub> <mo>)</mo> </mrow> <msub> <mi>Z</mi> <mrow> <mi>L</mi> <mn>0</mn> </mrow> </msub> <mo>&rsqb;</mo> </mrow>Wherein,It is the phase voltage of the head end of A phases,It is the phase voltage of the head end of B phases,It is the phase voltage of the head end of C phases,It is A phase phase currents,It is B phase phase currents,It is C phase phase currents, Z_{L}It is unit impedance of the head end to short dot, Z_{L1}、Z_{L2}、 Z_{L0}Represent that positive sequence impedance, negative sequence impedance and zero sequence impedance, L are the distance between two head ends successively respectively, a operators, X is head end To the distance of short dot.
 A kind of 6. transmission line of electricity oneend fault ranging method according to claim 1, it is characterised in that the threephase shortcircuit In the case of, fault localization calculation formula is：<mrow> <msub> <mover> <mi>U</mi> <mo>&CenterDot;</mo> </mover> <mi>A</mi> </msub> <mo>+</mo> <msub> <mover> <mi>U</mi> <mo>&CenterDot;</mo> </mover> <mi>B</mi> </msub> <mo>+</mo> <msub> <mover> <mi>U</mi> <mo>&CenterDot;</mo> </mover> <mi>C</mi> </msub> <mo>=</mo> <mi>X</mi> <mrow> <mo>(</mo> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>A</mi> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>B</mi> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mi>C</mi> </msub> <mo>)</mo> </mrow> <msub> <mi>Z</mi> <mrow> <mi>L</mi> <mn>0</mn> </mrow> </msub> </mrow>Wherein,It is the phase voltage of the head end of A phases,It is the phase voltage of the head end of B phases,It is the phase voltage of the head end of C phases,It is A phase phase currents,It is B phase phase currents,It is C phase phase currents, Z_{L}It is unit impedance of the head end to short dot, Z_{L1}、Z_{L2}、 Z_{L0}Represent that positive sequence impedance, negative sequence impedance and zero sequence impedance, L are the distance between two head ends successively respectively, a operators, X is head end To the distance of short dot.
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