CN1282876A - Method and equipment for positioning failure point on electric power transmission line - Google Patents

Method and equipment for positioning failure point on electric power transmission line Download PDF

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Publication number
CN1282876A
CN1282876A CN00124804A CN00124804A CN1282876A CN 1282876 A CN1282876 A CN 1282876A CN 00124804 A CN00124804 A CN 00124804A CN 00124804 A CN00124804 A CN 00124804A CN 1282876 A CN1282876 A CN 1282876A
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phase
fault
sampling
current
data
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CN1100997C (en
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罗承沐
苏进喜
解子凤
吴欣荣
陈铮
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Tsinghua University
Qinghua University
QINGHUA UNIV
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Tsinghua University
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    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS 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
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52Outage or fault management, e.g. fault detection or location

Abstract

A method for position the failure point on power transmission line includes acquiring data to obtain the voltage and current signals at both ends of the line to be protected; recording and transmitting the data to obtain the data needed for positioning failure point; and correct positioning the failure point. Its equipment is composed of secondary CT/PT converter. A/D sampling card, GPS timing card, and computers at primary and secondary stations. Its advantages are quick colculation, less colculated contents and high positioning speed.

Description

Failure point of power transmission line localization method and device
The present invention relates to a kind of failure point of power transmission line localization method and device, belong to the transmission facility technical field.
The research of localization of fault both at home and abroad divides from principle at present through long-term development, mainly can be divided into two big class one traveling wave method and impedance methods.Traveling wave method is the time of the capable ripple arrival of the high frequency transient of the approximate light velocity that send the trouble spot when utilizing measuring circuit fault two ends bus to calculate fault distance.Canada Harry Lee leader BritishColumbia Hydro power station developed Travelling Wave Fault Location device based on Global Positioning System (GPS) (hereinafter to be referred as GPS), successful operation is on the high-tension line of 500kV.Domestic Xi'an Communications University has become practical travelling wave ranging device with Shandong Ke Hui electric corporation cooperation research and development.Yet the extraction of the capable ripple of high frequency of butt joint dipped beam speed has very high requirement to hardware, and whole installation cost is higher.Simultaneously because the uncertainty that fault traveling wave takes place, fault traveling wave transmitted wave be difficult to discern and the frequency of parameter becomes and the influence factor of velocity of wave also makes the bearing accuracy of traveling wave method be affected easily, especially in China's electric system, extensively limit entering of high frequency carrier at substation bus bar outside installing trapper, this has simultaneously also stoped entering of the capable ripple of high frequency after the fault, and this makes the application of traveling wave method China electric system be subjected to very big restriction.
Impedance can be subdivided into single-ended method and both-end method according to obtaining the one-sided still difference of bilateral bus signal.The failure wave-recording instrument of domestic each company such as exploitations such as NARI, SiFang Electric Applicance with the fault location function module substantially all be to adopt the single-ended impedance method, single-ended method is because the defective on its principle, can't eliminate the influence of transition resistance, although the compensation after a series of hypothesis has remedied certain bearing accuracy, under the degradation failure condition, still can't satisfy requirement of engineering.The pseudo-root problem of fault transition resistance or peer-to-peer system impedance variation, transmission line of electricity asymmetry and range finding solution of equation etc. all can influence its precision in the localization of fault of reality.
The objective of the invention is at the electric system actual needs, propose a kind of quick, accurate, reliable line fault localization method, to satisfy transmission line malfunction location an urgent demand.The method is gathered the both-end data, and makes the two ends signal Synchronization by GPS, and is that succinct universal and uniform localization of fault equation is derived on the basis with the lumped parameter model, is not subjected to the influence of fault type, fault transition resistance size type.Fundamentally eliminate the influence of fault transition resistance based on the algorithm of the differential equation of both-end electric parameters, and calculate fast, operand is little, and speed is fast.Capacitance compensation has been carried out in influence for long power transmission line consideration line distribution capacitance simultaneously, makes it also reach higher positioning accuracy under long line.At the in esse double-circuit line situation of electric system, algorithm also has popularization, makes it have very strong application.Simultaneously, this localization method is considered the emergency measure of coming under the unexpected situation, and when both-end data sync or transmission went wrong, system can start single-ended algorithm automatically, provides positioning result, and was reliable and stable with what guarantee to move.A large amount of Digital Simulation and dynamic model experiments prove that this method has good bearing accuracy and very stable runnability, has wide practical use.
Failure point of power transmission line localization method and device comprise following each several part:
One, part of data acquisition one obtains the voltage and current signal at protected circuit two ends
(1) the three-phase high-voltage large current of transmission line of electricity bus primary side is transformed into the low voltage signal that can gather and measure after secondary CT/PT conversion.Obtaining corresponding digital signal through the A/D sampling preserves;
(2) the transmission line of electricity both sides utilize GPS (Global Positioning System (GPS)) to obtain the pulse per second (PPS) of error less than a microsecond, to obtain corresponding sampling pulse, as the trigger pulse of A/D data acquisition, make two side datas keep sample-synchronous behind frequency division;
(3) according to the current/voltage digital signal of A/D sampling gained, judge whether circuit breaks down,, then repeat process as the circuit non-fault.The basis for estimation whether fault takes place has following several:
I: utilize the electric current and voltage data computation of half cycle that the half-wave integration algorithm obtains sampling to obtain an effective value, and with its with start definite value and compare, if phase current or zero-sequence current are then thought and are broken down greater than setting definite value or phase voltage or residual voltage less than setting value;
II: the phase current values of the instantaneous moment that sampling is obtained, the corresponding current value of calculating negative-sequence current value, zero-sequence current value and the previous cycle corresponding point of gained are subtracted each other, if the gained result continuous 9 times greater than the setting definite value, then think and break down;
More than various criterions all with the form of logical OR synergy, any criterion starts, and thinks that then system breaks down.
Two, data recording and hop one obtain the localization of fault desired data
(1) as line failure, then begin to carry out failure wave-recording, note circuit both sides current and voltage data in the certain hour of fault front and back, note the moment that circuit both sides fault takes place simultaneously, write data file and preserve;
(2) after data recording finished, the data file that transmission line of electricity one side is noted was sent to the opposite side of circuit and preserves;
Three, fault location part one obtains accuracy position of fault point
Judge at the transmission line of electricity data receiver, see whether normally to have received the data file that the circuit opposite side is sent.Can be divided into following two kinds of situations:
(1) if do not receive the offside data file or the offside data file that received imperfect, then enable single-ended differential algorithm and carry out localization of fault, concrete grammar is:
I: utilize one-sided voltage and current signal, judge the line fault type.As the criterion of selecting the fault phase, the difference of establishing biphase current fault component amount is respectively poor (the also fault component of biphase current difference) that mainly adopt the biphase current fault component during judgement: I • ABg = ( I • A - I • B ) g , I • BCg = ( I • B - I • C ) g , I • CAg = ( I • C - I • A ) g , Then, satisfy following condition respectively for various fault types:
The criterion of singlephase earth fault is:
A phase ground connection: ( | I . ABg | > > | I . BCg | ) ∩ ( | I . CAg | > > | I . BCg | )
B phase ground connection: ( | I . ABg | > > | I . CAg | ) ∩ ( | I . BCg | > > | I . CAg | )
C phase ground connection: ( | I . CAg | > > | I . ABg | ) ∩ ( | I . CAg | > > | I . ABg | )
The criterion of phase-to phase fault is:
The AB phase to phase fault: ( | I . ABg | > | I . CAg | ) ∩ ( | I . ABg | > | I . BCg | )
The BC phase to phase fault: ( | I . BCg | > | I . ABg | ) ∩ ( | I . BCg | > | I . CAg | )
The CA phase to phase fault: ( | I . CAg | > | I . ABg | ) ∩ ( | I . CAg | > | I . BCg | )
Whether be whether earth fault can be according to having zero-sequence component to judge.
The criterion of three phase short circuit fault is: | I • ABg | ≈ | I • BCg | ≈ | I • CAg |
II: according to the different faults type, select for use corresponding ranging formula to calculate position of failure point, concrete formula is: the singlephase earth fault ranging formula is (is example with A phase ground connection): D = U a ( i ) i 12 ( i + 1 ) - U a ( i + 1 ) i 12 ( i ) r l i r ( i ) i 12 ( i + 1 ) + l 1 p ( i ) i 12 ( i + 1 ) - r l i r ( i + 1 ) i 12 ( i ) - l 1 p ( i + 1 ) i 12 ( i )
Wherein, each variable-definition is as follows: i r = i a + k r 3 i 0 p ( t ) = d ( i a + k l 3 i 0 ) dt i 12 = ( Δ i a - i 0 ) p ( t ) = d [ i a ( i + 1 ) + k i 3 i 0 ( i + 1 ) - i a ( i - 1 ) - k i 3 i 0 ( i - 1 ) ] 2 Δt , △ t is a sampling interval.
Two-phase phase-to phase fault (is example with AB two-phase phase-to phase fault): D = U ab ( i ) Δ i a ( i + 1 ) - U ab ( i + 1 ) Δ i a ( i ) r l i ab ( i ) Δ i a ( i + 1 ) - r l i ab ( i + 1 ) Δ i a ( i ) + l l Δ i a ( i + 1 ) p ( i ) - l l Δ i a ( i ) p ( i + 1 ) Wherein: p ( i ) = d [ i a ( i + 1 ) - i b ( i + 1 ) - i a ( i - 1 ) + i b ( i - 1 ) ] 2 Δt , △ t is a sampling interval.
Two phase ground (is example with the AB two phase ground) and three-phase fault D = U ab ( i ) r l i ab + l 1 i ab ( i + 1 ) - i ab ( i - 1 ) 2 Δt
In the last ranging formula:
r 1, l 1Unit positive sequence resistance and reactance for circuit
r s, l s, r m, l mFor the unit self-resistance of circuit with from reactance, mutual resistance and mutual reactance
R fBe short circuiting transfer resistance, i fFor flowing through the electric current of transition resistance
U a, U b, U c, i a, i b, i cFor installing the three-phase electricity tolerance that the installation place records
D is the distance of fault installation place to the trouble spot
(2) if data transmission is normal, then calls both-end synchronized sampling differential algorithm and position calculating, that is:
I: according to the time of failure that writes down in the data file of circuit both sides, adjust, obtain the synchronous both end voltage current data of any sampling instant by displacement;
II: be to eliminate the positioning error that secondary CT magnetic saturation influence brings, the magnetic saturation external characteristic curve according to secondary CT carries out the saturation compensation correction to three-phase current, obtains the actual primary side CT normal three-phase current size of coming out;
III: call the both-end ranging formula and calculate, obtain the trouble spot distance.Ranging formula is: x = - Σ m = a , b , c Σ k = 1 N A m ( k ) B m ( k ) Σ m = a , b , c Σ k = 1 N B m 2 ( k ) , X is the position of trouble spot.
Wherein: A m ( k ) = u mS ( k ) - u mR ( k ) - d Σ p = a , b , c [ r mp i pS ( k ) + l mp 2 · Δt [ i pS ( k + 1 ) - i pS ( k - 1 ) ] ] B m ( k ) = Σ p = a , b , c { r mp [ i pR ( k ) + i pS ( k ) ] + l mp 2 · Δt [ i pS ( k + 1 ) - i pS ( k - 1 ) ] + l mp 2 · Δt [ i pR ( k + 1 ) - i pR ( k - 1 ) ] }
S, R represent the two ends of circuit respectively, and wherein m is to a, b, and the c three-phase is all set up, and transmission line parameter is as follows:
The every phase self-resistance of unit length: r Aa, r Bb, r Cc
The every phase self-inductance of unit length: l Aa, l Bb, l Cc
The alternate mutual resistance of unit length: r Ab, r Ac, r Bc
The alternate mutual inductance of unit length: l Ab, l Ac, l Bv
u MS(k) and u MR(k) be transmission line of electricity S end and R end t=k Δ t (k=1,2, the phase voltage instantaneous sampling value in the time of ..N), equally, i MS(k) and i MR(k) be the electric current instantaneous sampling value, but the electric current and voltage sampled value of both sides must have simultaneity.M=a wherein, b, c, Δ t is a sampling interval, N is total sampling number.
Failure point of power transmission line locating device of the present invention comprises secondary CT/PT transducer, A/D sampling plate, GPS time service plate, master station computer and secondary station computing machine; Each is connected described two secondary CT/PT transducers with two sides of test line, is transformed into low voltage signal in order to the high-voltage large current with circuit two sides; Described A/D sampling plate is the multi-channel synchronous data acquisition card, in order to passing to master station computer and secondary station Computer Processing after the low voltage signal sampling; Described GPS time service plate links to each other with the A/D sampling plate, with the A/D converter that triggers the A/D sampling plate electric current and voltage is carried out synchronous acquisition in order to produce time clock; Described master station computer reads the data that the A/D sampling plate is gathered respectively with secondary station computing machine, and data are analyzed, handled, localization of fault and transmission.
Failure point of power transmission line localization method and device that the present invention proposes fundamentally eliminate the influence of fault transition resistance based on the algorithm of the differential equation of both-end electric parameters, and calculate fast, and operand is little, and speed is fast.Capacitance compensation has been carried out in influence for long power transmission line consideration line distribution capacitance simultaneously, makes it can be applied to long line location.This localization method has also been considered the emergency measure under the fortuitous event, and when both-end data sync or transmission went wrong, system can start single-ended algorithm, provides positioning result, and is reliable and stable with what guarantee to move.A large amount of Digital Simulation and dynamic model experiments prove that method and apparatus of the present invention has good bearing accuracy and very stable runnability, has wide practical use.
Description of drawings:
Fig. 1 is the structured flowchart of device of the present invention.
Introduce detailed content of the present invention below in detail.
First and second conversion
Secondary current mutual inductor and voltage transformer (VT) are to be used for the high-voltage large current of system's primary side is transformed into the low voltage signal that can gather and measure, are passed by Computer Processing by A/D sampling back.So progress of disease accuracy affects locating accuracy of secondary CT and PT.Because dynamic range of currents is bigger, so choosing of secondary CT will be satisfied following technical requirement:
(1) electric current is less under the nominal operation state, guarantee that it has higher conversion precision, and measuring error should be less than 0.5%.
(2) in Short-Circuit High Current and contain under the situation of DC component, transducer can not take place saturated.Waveform does not distort, and the error of 20 times of rated current should be less than 5%.
Two, data acquisition
Comprise two parts: A/D part and triggering part.
(1) the A/D sampling plate is a multi-channel synchronous data acquisition card.Its work characteristics is: 16 road input signals, synchronized sampling keeps, and can keep the locking phase relation of each road signal.Carry out under the situation of 16 tunnel signals collecting sampling rate 2.4KHz.A/D resolution is 12.The input of simulating signal difference, scope is-5V-+5V.Adopt high speed optoelectronic to isolate between digital circuit and the mimic channel, both guaranteed the safety of computer system, prevented the influence of digital circuit and computer switching power supply undesired signal again effectively the AD conversion accuracy.System synchronization can adopt inquiry mode, also can adopt interrupt mode.AD card and system interface mode are the PC bus.
(2) trigger pulse is provided by GPS time service plate.Gps receiver adopts the time service type UToncore of motorola inc, and it receives the 1PPS precision is positive and negative 50ns.GPS time service plate is used to extract the global unified time code information that gps receiver provides, and provides it to the markers of system as sampled data then.GPS time service plate is the PC bus, is used to produce assigned frequency and the time clock global standards clock synchronization.This plate produces pulsed frequency and reaches as high as 5KHz, and the synchronous clock pulse frequency of output can be set arbitrarily, and synchronization accuracy is better than 1 microsecond, in order to synchronous triggering A/D collection plate.
The synchronous working principle of data acquisition: GPS unit and data collecting card are designed to PC bus structure mode, are inserted in the isa bus slot of industrial computer base plate.Generation frequency in GPS unit is that the global unified time clock of 2.4K comes the A/D converter of triggering collection unit that electric current and voltage is carried out synchronous acquisition.The A/D capture card is equal interval sampling (ripple sample 48 points) weekly under the synchronizing pulse of GPS time service plate, then sampled data is stored in the data-carrier store of collecting unit, because the sampled data of every of collecting unit is one to one with the Synchronous Sampling Pulse that the GPS unit produces, thereby carry out simultaneously to the collection of electric current and voltage at the circuit two ends of feasible be separated by tens kilometers or up to a hundred kilometers.
Three, data processing localization part
(1) the both sides PC reads the data that A/D gathers with inquiry mode, and whether real-time judge have fault to take place, as breaks down, and then begins failure wave-recording, and current and voltage data before and after the record trouble, and the fault moment that provides of record GPS write data file.Secondary station PC begins to transmit data to main website, and the PC of main website begins received data file simultaneously.
Receive secondary station data when (2) PC of main website judges, as do not have normal reception, then only utilize this side one-terminal current voltage data, enable single-ended method localization of fault, obtain position of failure point.(location algorithm is seen below attached);
(3) as the secondary station of the normal reception data file of sending out, then:
I: the fault that is write down according to the both sides data file takes place to adjust and obtain synchronous corresponding both sides electric current and voltage data of any time constantly, is used for the synchronous location algorithm of both-end;
The saturated correction of II: CT:
Current transformer saturated is the problem that guarantees that the institute of fault localization accuracy must solution.When electric current or DC component were big greatly, secondary CT was saturated easily.In case it is saturated that CT takes place, the bus current that institute's conversion obtains can not actual response primary current size, so must compensate and correct.Bulk properties and external characteristic according to mutual inductor exist fixing relation (promptly can be converted into excitation curve by the volt-ampere curve of transformer iron core), the external characteristic curve data (volt-ampere curve) that at first the mutual inductor actual measurement is obtained is converted into the iron core excitation curve, backoff algorithm utilizes energy measurement obtains after the short circuit secondary current value to calculate the transient state magnetic flux of iron core, then according to the anti-exciting current value that causes the saturated error of mutual inductor transient state of releasing of excitation curve, at last the secondary saturation current is compensated, obtain actual current value and be used for location Calculation.
III: call the synchronous differential algorithm of both-end and calculate position of failure point.

Claims (2)

1, a kind of failure point of power transmission line localization method is characterized in that, this method comprises following each step:
(1) data acquisition is to obtain the voltage and current signal at protected circuit two ends:
1. the three-phase high-voltage large current of transmission line of electricity bus primary side is transformed into the low voltage signal that can gather and measure after secondary CT/PT conversion, obtains corresponding digital signal through the A/D sampling and preserves;
2. the transmission line of electricity both sides utilize GPS (Global Positioning System (GPS)) to obtain the pulse per second (PPS) of error less than a microsecond, to obtain corresponding sampling pulse, as the trigger pulse of A/D data acquisition, make two side datas keep sample-synchronous behind frequency division;
3. according to the current/voltage digital signal of A/D sampling gained, judge whether circuit breaks down, if the circuit non-fault then repeats above process, the basis for estimation whether fault takes place is:
I: utilize the electric current and voltage data computation of half cycle that the half-wave integration algorithm obtains sampling to obtain an effective value, and with its with start definite value and compare, if phase current or zero-sequence current are then thought and are broken down greater than setting definite value or phase voltage or residual voltage less than setting value; Or
II: the phase current values of the instantaneous moment that sampling is obtained, the corresponding current value of calculating negative-sequence current value, zero-sequence current value and the previous cycle corresponding point of gained are subtracted each other, if the gained result continuous 9 times greater than the setting definite value, then think and break down;
Above criterion is with the form synergy of logical OR, and any criterion starts, and thinks that then system breaks down;
(2) data recording and transmission are to obtain the localization of fault desired data;
1. if line failure then begins to carry out failure wave-recording, circuit both sides current and voltage data in the certain hour before and after the record trouble simultaneously the moment of record circuit both sides fault generation, writes data file and preserves;
2. after data recording finished, the data file that transmission line of electricity one side is noted was sent to the opposite side of circuit and preserves;
(3) localization of fault is to obtain accuracy position of fault point:
Judge at the transmission line of electricity data receiver whether normally receive the data file that the circuit opposite side is sent:
1. imperfect as if the offside data file that does not receive the offside data file or received, then to enable single-ended differential algorithm and carry out localization of fault, concrete grammar is:
I: utilize one-sided voltage and current signal, judge the line fault type, the difference that adopts the biphase current fault component during judgement is as the criterion of selecting the fault phase, and the difference of establishing biphase current fault component amount is respectively: I • ABg = ( I • A - I • B ) g , I • BCg = ( I • B - I • C ) g , I • CAg = ( I • C - I • A ) g , Then, satisfy following condition respectively for various fault types:
The criterion of singlephase earth fault is: A phase ground connection: ( | I . ABg | > > | I . BCg | ) ∩ ( | I . CAg | > > | I . BCg | ) B phase ground connection: ( | I . ABg | > > | I . CAg | ) ∩ ( | I . BCg | > > | I . CAg | ) C phase ground connection: ( | I . CAg | > > | I . ABg | ) ∩ ( | I . CAg | > > | I . ABg | )
The criterion of phase-to phase fault is:
The AB phase to phase fault: ( | I . ABg | > | I . CAg | ) ∩ ( | I . ABg | > | I . BCg | )
The BC phase to phase fault: ( | I . BCg | > | I . ABg | ) ∩ ( | I . BCg | > | I . CAg | )
The CA phase to phase fault: ( | I . CAg | > | I . ABg | ) ∩ ( | I . CAg | > | I . BCg | )
Whether be whether earth fault can be according to having zero-sequence component to judge;
The criterion of three phase short circuit fault is: | I • ABg | ≈ | I • BCg | ≈ | I • CAg |
II:, select for use corresponding ranging formula to calculate position of failure point according to the different faults type:
The singlephase earth fault ranging formula is: D = U a ( i ) i 12 ( i + 1 ) - U a ( i + 1 ) i 12 ( i ) r l i r ( i ) i 12 ( i + 1 ) + l 1 p ( i ) i 12 ( i + 1 ) - r l i r ( i + 1 ) i 12 ( i ) - l 1 p ( i + 1 ) i 12 ( i )
Wherein, each variable-definition is as follows: i r=i a+ K r3i o p ( t ) = d ( i a + k l 3 i 0 ) dt i 12 = ( Δ i a - i 0 ) p ( t ) = d [ i a ( i + 1 ) + k i 3 i 0 ( i + 1 ) - i a ( i - 1 ) - k i 3 i 0 ( i - 1 ) ] 2 Δt , △ t is a sampling interval.
The ranging formula of two-phase phase-to phase fault is: D = U ab ( i ) Δ i a ( i + 1 ) - U ab ( i + 1 ) Δ i a ( i ) r l i ab ( i ) Δ i a ( i + 1 ) - r 1 i ab ( i + 1 ) Δ i a ( i ) + l l Δ i a ( i + 1 ) p ( i ) - l l Δ i a ( i ) p ( i + 1 ) Wherein: p ( i ) = d [ i a ( i + 1 ) - i b ( i + 1 ) - i a ( i - 1 ) + i b ( i - 1 ) ] 2 Δt , △ t is a sampling interval.
The ranging formula of two phase ground and three-phase fault is: D = U ab ( i ) r l i ab ( i ) + l 1 i ab ( i + 1 ) - i ab ( i - 1 ) 2 Δt
In the above ranging formula: r 1, l 1Unit positive sequence resistance and reactance r for circuit s, l s, r m, l mFor the unit self-resistance of circuit with from reactance, mutual resistance and mutual reactance R fBe short circuiting transfer resistance, i fFor flowing through the electric current U of transition resistance a, U b, U c, i a, i b, i cThe three-phase electricity tolerance D that records for the device installation place is the distance of fault installation place to the trouble spot
2. if data transmission is normal, then calls both-end synchronized sampling differential algorithm and position calculating, that is:
I: according to the time of failure that writes down in the data file of circuit both sides, adjust, obtain the synchronous both end voltage current data of any sampling instant by displacement;
II: be to eliminate the positioning error that secondary CT magnetic saturation influence brings, the magnetic saturation external characteristic curve according to secondary CT carries out the saturation compensation correction to three-phase current, obtains the actual primary side CT normal three-phase current size of coming out;
III: call the both-end ranging formula and calculate, obtain the trouble spot distance, ranging formula is: x = Σ m = a , b , c Σ k = 1 N A m ( k ) B m ( k ) Σ m = a , b , c Σ k = 1 N B m 2 ( k ) , X is the position of trouble spot,
In the following formula: A m ( k ) = u mS ( k ) - u mR ( k ) - d Σ p = a , b , c [ r mp o pS ( k ) + l mp 2 · Δt [ i pS ( k + 1 ) - i pS ( k - 1 ) ] ] B m ( k ) = Σ p = a , b , c { r mp [ i pR ( k ) + i pS ( k ) ] + l mp 2 · Δt [ i pS ( k + 1 ) - i pS ( k - 1 ) ] + l mp 2 · Δt [ i pR ( k + 1 ) - i pR ( k - 1 ) ] }
S, R represent the two ends of circuit respectively, and wherein m is to a, b, and the c three-phase is all set up, and transmission line parameter is as follows:
The every phase self-resistance of unit length: r Aa, r Bb, r Cc
The every phase self-inductance of unit length: l Aa, l Bb, l Cc
The alternate mutual resistance of unit length: r Ab, r Ac, r Bc
The alternate mutual inductance of unit length: l Ab, l Ac, l Bc
u MS(k) and u MR(k) be transmission line of electricity S end and R end t=k Δ t (k=1,2, the phase voltage instantaneous sampling value in the time of ..N), equally, i MS(k) and i MR(k) be the electric current instantaneous sampling value, m=a wherein, b, c, Δ t is a sampling interval, N is total sampling number.
2, a kind of failure point of power transmission line locating device is characterized in that, this device comprises secondary CT/PT transducer, A/D sampling plate, GPS time service plate, master station computer and secondary station computing machine; Each is connected described two secondary CT/PT transducers with two sides of test line, is transformed into low voltage signal in order to the high-voltage large current with circuit two sides; Described A/D sampling plate is the multi-channel synchronous data acquisition card, in order to passing to master station computer and secondary station Computer Processing after the low voltage signal sampling; Described GPS time service plate links to each other with the A/D sampling plate, with the A/D converter that triggers the A/D sampling plate electric current and voltage is carried out synchronous acquisition in order to produce time clock; Described master station computer reads the data that the A/D sampling plate is gathered respectively with secondary station computing machine, and data are analyzed, handled, localization of fault and transmission.
CN00124804A 2000-09-15 2000-09-15 Method and equipment for positioning failure point on electric power transmission line Expired - Fee Related CN1100997C (en)

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CN104204824A (en) * 2011-11-28 2014-12-10 诺丁汉大学 Fault location in power distribution systems
CN104502788A (en) * 2015-01-09 2015-04-08 国网电力科学研究院武汉南瑞有限责任公司 Vehicle-mounted intelligent grounding detection system and grounding detection method
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CN100451887C (en) * 2006-07-25 2009-01-14 上海振华港口机械(集团)股份有限公司 Universal electric-controlled system fault locating method
CN101344567B (en) * 2007-05-18 2012-11-14 Abb技术有限公司 Method for determining location of phase-to-earth fault
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CN101779134B (en) * 2007-07-19 2013-02-20 Abb研究有限公司 Method for fault location in uncompensated power lines with two-end unsynchronized measurement
CN101413982B (en) * 2007-10-18 2011-07-20 深圳长城开发科技股份有限公司 Method and apparatus for detecting short circuit of current loop
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