CN105891669B - Line single phase grounding failure distance measuring method based on transition resistance actual measurement - Google Patents
Line single phase grounding failure distance measuring method based on transition resistance actual measurement Download PDFInfo
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- 230000005540 biological transmission Effects 0.000 claims abstract description 39
- 238000009434 installation Methods 0.000 claims abstract description 18
- 230000005611 electricity Effects 0.000 claims abstract description 15
- 230000001681 protective effect Effects 0.000 claims description 12
- 239000011800 void material Substances 0.000 claims description 3
- 230000001012 protector Effects 0.000 claims description 2
- 238000000819 phase cycle Methods 0.000 claims 1
- 230000004807 localization Effects 0.000 description 3
- 230000007257 malfunction Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
Abstract
The invention discloses a kind of line single phase grounding failure distance measuring methods based on transition resistance actual measurement.The method of the present invention measures the faulted phase voltage of line protection installation place first, faulted phase current, failure phase negative-sequence current and zero-sequence current, transmission line of electricity voltage is described using distributed parameter model, the physical characteristic of electric current transmission, the transition resistance of computing electric power line Single-phase Ground Connection Failure, using the transition resistance and transition resistance difference function values of every bit in linear search method successively computing electric power line, reach the precision ranging that this minimum characteristic realizes transmission line one-phase earth fault using the transition resistance difference function values at transmission line one-phase earth fault point, distribution capacity is eliminated in principle, the influence of the factors such as transition resistance and load current, with very high range accuracy.The method of the present invention is a kind of method of search type, and there is no the pseudo- root problem of the method for solving equation and the not convergence problems of iterative method, has very strong practicability.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System fields, concretely relate to a kind of based on transition resistance actual measurement
Line single phase grounding failure distance measuring method.
Background technique
Used in ranging electrical quantity divides, and the method for fault localization can be divided into two major classes: both-end distance measuring and single end distance measurement.
Two-terminal Fault Location method is the method for determining transmission line malfunction position using transmission line of electricity both ends electrical quantity, it is needed by logical
Road obtains opposite end electrical quantity, therefore, influence in actual use also vulnerable to both-end sampling value synchronization strong to the dependence in channel.
Single end distance measurement method is that a kind of method of transmission line malfunction position is determined merely with the voltage and current data of transmission line of electricity one end, by
An end data is only needed in it, without communication and data synchronizer, operating cost is low and algorithmic stability, therefore in mesolow line
It is widely applied in road.Currently, method of single end distance measurement is broadly divided into two classes, one kind is traveling wave method, and another kind of is impedance
Method.Traveling wave method carries out ranging using the transmission property of fault transient travelling wave, and precision is high, not by shadows such as the method for operation, excessive resistances
It rings, but very high to sample rate requirement, needs special wave recording device, do not obtain substantive application at present.Impedance method utilizes event
Voltage, the magnitude of current after barrier calculate the impedance of fault loop, carry out ranging, letter according to the line length characteristic directly proportional to impedance
It is single reliable, but the factors such as transition resistance, route non complete symmetry by failure are influenced.Due to being deposited along ultra-high-tension power transmission line
In biggish capacitance current, when high resistant short trouble in ultra-high-tension power transmission line generation, single-ended impedance method distance measurement result meeting
Substantial deviation true fault distance is not able to satisfy the application requirement at scene.Therefore, the single-ended impedance method modeled using lumped parameter
It is not directly applicable the fault localization of ultra-high-tension power transmission line.
The concern of numerous scholars is gradually caused using distributed parameter model research ultra-high-tension power transmission line one-end fault ranging.
" discussion of ultra-high-tension power transmission line single end distance measurement new principle " that the permanent rising sun, Zhang Baohui, Lv Zhi et al. are delivered is breathed out to build using distribution parameter
Mould, using single ended voltage electric current calculate along the adjust the distance norm distribution on the line of derivative of voltage carry out fault point and determine
Position.This method relates to a large amount of derivative operation and integral operation, and required operand is big, and algorithm complexity is not easy to realize.Lin Xiangning,
" the ratio phase formula single-phase fault single end distance measurement algorithm based on distributed parameter model " that yellow small echo et al. is delivered is built using distribution parameter
Mould carries out fault location according to the residual voltage of fault point and fault current same-phase feature.The method improve distribution capacity pair
The influence of single-ended impedance method fault localization, but in high resistance earthing fault, range error reaches -2.38%, and Error Absolute Value is greater than
1.5%, it is not able to satisfy the application requirement at scene.Wang Bin, Dong Xinzhou et al. deliver " UHV Long Transmission Line single-ended impedance method is single-phase
Earth fault distance measurement " it is modeled using distribution parameter, the phase angle of fault point voltage is estimated using the phase angle of negative-sequence current at observation point,
Then measurement impedance is calculated in fault point voltage instantaneous value zero passage point moment.This method is in medium or low resistance short trouble, due to edge
Line voltage decline is obvious, using error existing for negative-sequence current phase angle estimation fault point voltage phase angle at observation point to distance measurement result
It influences little；But in high resistant short trouble, due to each point voltage phase difference very little along route, negative-sequence current at observation point is utilized
Phase angle estimates that error existing for fault point voltage phase angle adds the influence of transient process, and this method range error is larger.
Summary of the invention
It is an object of the present invention to overcome the deficiencies of the prior art, and to provide a kind of with natural anti-distribution capacity shadow
Loud ability, the line single phase grounding failure distance measuring method based on transition resistance actual measurement of registration.
To complete above-mentioned purpose, the present invention adopts the following technical scheme:
Based on the line single phase grounding failure distance measuring method of transition resistance actual measurement, it is characterized by, including sequentially walk as follows
It is rapid:
(1) faulted phase voltage of protector measuring line protection installation placeFaulted phase currentFailure phase
Negative-sequence currentAnd zero-sequence currentWherein, φ=A, B, C phase；
(2) the transition resistance R of protective device computing electric power line Single-phase Ground Connection Failureφ:
Wherein, lsetFor protection seting range；Z0For the system zero sequence equivalent impedance of line protection installation place；γ1、
γ0Respectively electric transmission line positive sequence, zero sequence propagation coefficient；Zc1、Zc0Respectively electric transmission line positive sequence, zero sequence wave impedance；
For protection seting range lsetThe zero sequence compensation system at place
Number；
ForReal part；ForImaginary part；
ForReal part；ForVoid
Portion；ForReal part；ForImaginary part；
(3) it is l that protective device, which chooses fault distance initial value,x, calculate the l apart from line protection installation placexThe mistake of point
Cross resistance R (lx):
Wherein,For apart from line protection installation place
lxThe zero-utility theory of point；
(4) protective device calculates the l apart from line protection installation placexThe transition resistance difference function of point | R (lx)-Rφ|
Value；
(5) fault distance lxIt is incremented by with fixed step size △ l, return step (3) is successively on computing electric power line at every bit
Transition resistance difference function | R (lx)-Rφ| value, until transmission line of electricity overall length；Choose transition resistance difference function on transmission line of electricity | R
(lx)-Rφ| the minimum corresponding point of value is transmission line one-phase earth fault point.
The present invention compared with prior art, has following positive achievement:
The method of the present invention is modeled using distribution parameter, the transition resistance of computing electric power line Single-phase Ground Connection Failure, is used
Linear search method successively on computing electric power line every bit transition resistance and transition resistance difference function values；Using distribution parameter
Model describes the physical characteristic of transmission line of electricity, and the ability that there is natural anti-distribution capacity to influence is suitable for super-pressure, extra-high voltage
The accurate positioning of transmission line of alternation current singlephase earth fault.The method of the present invention uses linear search method successively computing electric power line
The transition resistance and transition resistance difference function values of upper every bit, it is poor using the transition resistance at transmission line one-phase earth fault point
Functional value reaches the precision ranging that this minimum characteristic realizes transmission line one-phase earth fault, and distribution electricity is eliminated in principle
The influence of the factors such as appearance, transition resistance and load current has very high range accuracy.The method of the present invention is a kind of search type
Method, there is no the pseudo- root problem of the method for solving equation and the not convergence problems of iterative method, have very strong practicability.
Detailed description of the invention
Fig. 1 is using multi-line power transmission system schematic of the invention.
Specific embodiment
Technical solution of the present invention is expressed in further detail below according to Figure of description.
Fig. 1 is using multi-line power transmission system schematic of the invention.CVT is voltage transformer in Fig. 1, CT is Current Mutual Inductance
Device.Current waveform of the protective device to the potential and current transformers CT of the voltage transformer CVT of line protection installation place
It is sampled to obtain voltage, current instantaneous value.
Protective device to sampling obtain voltage, current instantaneous value using Fourier algorithm computing electric power line protection installation
The faulted phase voltage at placeFaulted phase currentFailure phase negative-sequence currentAnd zero-sequence currentWherein, φ=A, B, C
Phase.
The transition resistance R of protective device computing electric power line Single-phase Ground Connection Failureφ:
Wherein, φ=A, B, C phase；lsetFor protection seting range；Z0For the system zero sequence etc. of line protection installation place
It is worth impedance；γ1、γ0Respectively electric transmission line positive sequence, zero sequence propagation coefficient；Zc1、Zc0Respectively electric transmission line positive sequence, zero sequence wave
Impedance；Ch () is hyperbolic cosine function；Sh () is hyperbolic sine function；
For protection seting range lsetThe zero sequence compensation system at place
Number；Th () is hyperbolic tangent function；ForReal part；ForVoid
Portion；
ForReal part；ForImaginary part；ForReal part；ForImaginary part.
It is l that protective device, which chooses fault distance initial value,x, calculate the l apart from line protection installation placexThe transition of point
Resistance R (lx):
Wherein,For apart from line protection installation place
The zero-utility theory of lx point；Z0For the system zero sequence equivalent impedance of line protection installation place；γ1、γ0Respectively transmit electricity
Route positive sequence, zero sequence propagation coefficient；Zc1、Zc0Respectively electric transmission line positive sequence, zero sequence wave impedance；Ch () is hyperbolic cosine letter
Number；Sh () is hyperbolic sine function；Th () is hyperbolic tangent function；φ=A, B, C phase.
Protective device calculates the l apart from line protection installation placexThe transition resistance difference function of point | R (lx)-Rφ| value.
Fault distance lxIt is incremented by with fixed step size △ l, successively the transition resistance difference letter on computing electric power line at every bit
Number | R (lx)-Rφ| value, until transmission line of electricity overall length.
Protective device chooses transition resistance difference function on transmission line of electricity | R (lx)-Rφ| the minimum corresponding point of value is power transmission line
Road Single-phase Ground Connection Failure.
The method of the present invention is a kind of method of search type, using every bit in linear search method successively computing electric power line
Transition resistance and transition resistance difference function values, reached using the transition resistance difference function values at transmission line one-phase earth fault point
The precision ranging of transmission line one-phase earth fault is realized to this minimum characteristic, and distribution capacity, transition electricity are eliminated in principle
The influence of the factors such as resistance and load current, has very high range accuracy.
The foregoing is merely preferred embodiments of the invention, but scope of protection of the present invention is not limited thereto, appoint
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of, all by what those familiar with the art
It is covered by the protection scope of the present invention.
Claims (1)
1. based on the line single phase grounding failure distance measuring method of transition resistance actual measurement, including following sequential steps:
(1) faulted phase voltage of protector measuring line protection installation placeFaulted phase currentFailure phase negative phase-sequence electricity
StreamAnd zero-sequence currentWherein, φ=A, B, C phase；
It is characterized by:
(2) the transition resistance R of protective device computing electric power line Single-phase Ground Connection Failureφ:
Wherein, lsetFor protection seting range；Z0For the system zero sequence equivalent impedance of line protection installation place；γ1、γ0Point
It Wei not electric transmission line positive sequence, zero sequence propagation coefficient；Zc1、Zc0Respectively electric transmission line positive sequence, zero sequence wave impedance；For protection seting range lsetThe zero-utility theory at place；ForReal part；ForImaginary part；
ForReal part；ForVoid
Portion；ForReal part；ForImaginary part；Ch () is hyperbolic cosine function；Sh () is hyperbolic sine letter
Number；
(3) it is l that protective device, which chooses fault distance initial value,x, calculate the l apart from line protection installation placexThe transition electricity of point
Hinder R (lx):
Wherein,For the l apart from line protection installation placexPoint
Zero-utility theory；Th () is hyperbolic tangent function；
(4) protective device calculates the l apart from line protection installation placexThe transition resistance difference function of point | R (lx)-Rφ| value；
(5) fault distance lxIt is incremented by with fixed step size Δ l, return step (3) the successively transition on computing electric power line at every bit
Resistance difference function | R (lx)-Rφ| value, until transmission line of electricity overall length；Choose transition resistance difference function on transmission line of electricity | R (lx)-Rφ|
The minimum corresponding point of value is transmission line one-phase earth fault point.
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Families Citing this family (8)
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| CN106841919B (en) * | 2017-01-25 | 2019-08-06 | 南京磐能电力科技股份有限公司 | The high-precision transmission line method of single end distance measurement calculated based on triangle |
| CN109459650B (en) * | 2018-11-09 | 2021-01-05 | 云南电网有限责任公司 | Ground fault transition resistance calculation method based on fusion of multiple ranging methods |
| CN111366812B (en) * | 2018-12-25 | 2022-04-01 | 深圳带路科技有限公司 | Dynamic capacity increasing method and detection device for high-voltage transmission line |
| CN112269144A (en) * | 2020-10-14 | 2021-01-26 | 西安热工研究院有限公司 | Line single-phase earth fault positioning method for wind power generation and transmission system |
| CN112531656B (en) * | 2020-11-20 | 2021-08-31 | 广东电网有限责任公司 | Relay protection system for high-resistance ground fault of power transmission line |
| CN112485601B (en) * | 2020-12-11 | 2023-08-25 | 国网四川省电力公司电力科学研究院 | Fault analysis method and system based on double-end line electrical quantity information |
| CN113064022B (en) * | 2021-03-12 | 2022-04-29 | 国网河南省电力公司电力科学研究院 | Line protection method based on transition resistance calculation |
| CN116930685B (en) * | 2023-09-18 | 2023-12-05 | 青岛鼎信通讯科技有限公司 | Single-end ranging method suitable for single-phase earth fault of power distribution network |
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