CN104730415B - Circuit inter-phase fault single-end ranging based on impedance mapping function amplitude characteristic - Google Patents
Circuit inter-phase fault single-end ranging based on impedance mapping function amplitude characteristic Download PDFInfo
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Abstract
The invention discloses a kind of circuit inter-phase fault single-end ranging based on impedance mapping function amplitude characteristic.The inventive method measures line protection installation place failure voltage between phases, failure three-phase current and the alternate negative-sequence current of failure first; calculate border impedance; using the linear search method successively comprehensive impedance on computing electric power line at every bit; and then the impedance mapping function value on computing electric power line at every bit successively, it is fault distance then to choose distance of the point away from line protection installation place that impedance mapping function value reaches minimum on transmission line of electricity.The influence of transition resistance and load current and power system operation mode is eliminated in the inventive method principle, there is very high range accuracy, is adapted to carry out the single end distance measurement function of 500kV, 220kV and 110kV electric transmission line phase fault.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System field, concretely relates to one kind and is based on impedance mapping function
Amplitude characteristic circuit inter-phase fault single-end ranging.
Background technology
One-end fault ranging method carries out fault location merely with transmission line of electricity one end electrical quantity, same without communication and data
Equipment is walked, operating cost is low and algorithmic stability, and extensive use is obtained in transmission line of electricity.One-end fault ranging method is broadly divided into
Traveling wave method and impedance method.Traveling wave method carries out one-end fault ranging using the transmission property of fault transient travelling wave, and precision is high, is not transported
Line mode, excessive resistance etc. influence, but require sample rate very high, it is necessary to which special wave recording device, application cost are high.Impedance method
Fault loop impedance is calculated using the voltage after failure, the magnitude of current, is carried out according to the line length characteristic directly proportional to impedance single
Fault localization is held, simple and reliable, but fault localization precision is influenceed seriously by factors such as transition resistance and load currents, especially mistake
Cross resistance it is larger when, impedance method distance measurement result can substantial deviation true fault distance, or even failure ranging failure or failure
Distance measurement result exceeds total track length, can not provide accurate fault location information, causes failure line walking difficult, is unfavorable for power transmission line
Road quick elimination of fault and the fast quick-recovery of line powering.
The content of the invention
It is an object of the present invention to overcome the deficiencies of the prior art, and to provide one kind is special based on impedance mapping function amplitude
Property circuit inter-phase fault single-end ranging.This method utilizes the impedance mapping function value at electric transmission line phase fault point
Reach this minimum characteristic and realize the single-ended precision ranging of electric transmission line phase fault, transition resistance is eliminated in principle and is born
The influence of charged current and power system operation mode, there is very high range accuracy, be adapted to carry out 500kV, 220kV and
The single end distance measurement function of 110kV electric transmission line phase faults.
To complete above-mentioned purpose, the present invention adopts the following technical scheme that：
Circuit inter-phase fault single-end ranging based on impedance mapping function amplitude characteristic, it is characterised in that including such as
Lower step：
(1) the failure voltage between phases of protector measuring line protection installation placeThe alternate negative-sequence current of failureWith failure three-phase currentWherein, φ φ=AB, BC, CA phase；
(2) protection device calculates border impedanceWherein, z1 be unit length transmission line of electricity just
Sequence impedance；Imaginary part；Imaginary part；φ φ=AB, BC, CA phase；
(3) it is l that protection device, which chooses fault distance initial value,x, calculate the l apart from line protection installation placexThat puts is comprehensive
Close impedance Δ Z+z1lx；
(4) protection device calculates the l apart from line protection installation placexThe impedance mapping function value of point
(5) fault distance lxIt is incremented by with fixed step size Δ l, return to step (3), successively every l on computing electric power linexPoint
Impedance mapping function valueUntil transmission line of electricity total length；
(6) protection device chooses impedance mapping function value on transmission line of electricityPoint is away from defeated corresponding to minimum
The distance of electric line protection installation place is fault distance；Wherein, it is transmission line length that fixed step size Δ l, which takes 0.001l, l,.
The present invention compared with prior art, has following positive achievement：
The inventive method measures line protection installation place failure voltage between phases, failure three-phase current and failure phase first
Between negative-sequence current, calculate border impedance, using the linear search method successively comprehensive impedance on computing electric power line at every bit,
And then the impedance mapping function value on computing electric power line at every bit successively, then choose impedance mapping function on transmission line of electricity
Distance of the point away from line protection installation place that value reaches minimum is fault distance.The inventive method is built using lumped parameter
Mould, algorithm principle is simple, and it is easy that program is realized, amount of calculation is small, and fault localization speed is fast.The inventive method utilizes transmission line of electricity phase
Between impedance mapping function value at short circuit trouble point reach this minimum characteristic and realize the single-ended essence of electric transmission line phase fault
True ranging, the influence of transition resistance and load current and power system operation mode is eliminated in principle, there is very high ranging
Precision, it is adapted to carry out the single end distance measurement function of 500kV, 220kV and 110kV electric transmission line phase fault.
Brief description of the drawings
Fig. 1 is the multi-line power transmission system schematic of the application present invention.
Embodiment
Technical scheme is expressed in further detail below according to Figure of description.
Fig. 1 is the multi-line power transmission system schematic of the application present invention.In Fig. 1 PT be voltage transformer, CT be Current Mutual Inductance
Device.Current wave of the protection device to the voltage waveform summation current transformer CT of the voltage transformer pt of line protection installation place
Shape is sampled to obtain voltage, current instantaneous value, and utilizes the failure phase of Fourier algorithm computing electric power line protection installation place
Between voltageThe alternate negative-sequence current of failureWith failure three-phase currentWherein, φ φ=AB, BC, CA phase.
Protection device calculates border impedanceWherein, z1 hinders for unit length electric transmission line positive sequence
It is anti-；Imaginary part；Imaginary part；φ φ=AB, BC, CA phase.
It is l that protection device, which chooses fault distance initial value,x, calculate the l apart from line protection installation placexThe synthesis of point
Impedance Δ Z+z1lx。
Protection device calculates the l apart from line protection installation placexThe impedance mapping function value of point
Fault distance lxIt is incremented by with fixed step size Δ l, successively every l on computing electric power linexThe impedance mapping function value of pointUntil transmission line of electricity total length；Wherein, it is transmission line length that fixed step size Δ l, which takes 0.001l, l,.
In above-mentioned, fault distance lxIt is incremented by since 0 and with fixed step size Δ l, until transmission line of electricity total length terminates to complete
Every l on transmission line of electricityxImpedance mapping function value at point calculates.
Protection device chooses impedance mapping function value on transmission line of electricityPoint is away from transmission of electricity corresponding to minimum
The distance of route protection installation place is fault distance.
The inventive method is modeled using lumped parameter, and algorithm principle is simple, and it is easy that program is realized, amount of calculation is small, and failure is surveyed
It is fast away from speed, electric transmission line phase fault point position is quick and precisely positioned, is advantageous to rapidly removing faults and recovers circuit
Power supply.
The inventive method reaches this minimum spy using the impedance mapping function value at electric transmission line phase fault point
Property realizes the single-ended precision ranging of electric transmission line phase fault, and transition resistance and load current and power train are eliminated in principle
The influence for the method for operation of uniting, has very high range accuracy, it is alternate to be adapted to carry out 500kV, 220kV and 110kV transmission line of electricity
The single end distance measurement function of short trouble.
The preferred embodiment of the present invention is the foregoing is only, but protection scope of the present invention is not limited thereto, and is appointed
What those familiar with the art the invention discloses technical scope in, the change or replacement that can readily occur in, all
It should be included within the scope of the present invention.
Claims (1)
1. the circuit inter-phase fault single-end ranging based on impedance mapping function amplitude characteristic, it is characterised in that including as follows
Step：
(1) the failure voltage between phases of protector measuring line protection installation placeThe alternate negative-sequence current of failureWith
Failure three-phase currentWherein, φ φ=AB, BC, CA phase；
(2) protection device calculates border impedanceWherein, z1 hinders for unit length electric transmission line positive sequence
It is anti-；ForImaginary part；ForImaginary part；φ φ=AB, BC, CA phase；
(3) it is l that protection device, which chooses fault distance initial value,x, calculate the l apart from line protection installation placexThe comprehensive resistance of point
Anti- Δ Z+z1lx；
(4) protection device calculates the l apart from line protection installation placexThe impedance mapping function value of point
(5) fault distance lxIt is incremented by with fixed step size Δ l, return to step (3), successively every l on computing electric power linexThe resistance of point
Anti- mapping function valueUntil transmission line of electricity total length；
(6) protection device chooses impedance mapping function value on transmission line of electricityPoint is away from power transmission line corresponding to minimum
The distance of road protection installation place is fault distance；Wherein, it is transmission line length that fixed step size Δ l, which takes 0.001l, l,.
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| CN105242174B (en) * | 2015-09-14 | 2018-10-16 | 国网福建省电力有限公司 | Based on impedance mapping function amplitude characteristic line single phase grounding failure distance measuring method |
| CN108802561B (en) * | 2017-05-05 | 2021-05-28 | 南京南瑞继保电气有限公司 | Method for positioning out-of-step oscillation center position based on minimum measured impedance |
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