CN107271842A - A kind of parallel erected on same tower double-circuit line Fault Locating Method based on positive-sequence component in the same direction - Google Patents
A kind of parallel erected on same tower double-circuit line Fault Locating Method based on positive-sequence component in the same direction Download PDFInfo
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- CN107271842A CN107271842A CN201710413795.2A CN201710413795A CN107271842A CN 107271842 A CN107271842 A CN 107271842A CN 201710413795 A CN201710413795 A CN 201710413795A CN 107271842 A CN107271842 A CN 107271842A
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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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Abstract
The present invention relates to a kind of parallel erected on same tower double-circuit line Fault Locating Method based on positive-sequence component in the same direction; it is characterized in that; the six-phase voltage amount and the magnitude of current at parallel erected on same tower double-circuit line system two ends after occurring first with the electric power mutual-inductor collection failure of protection installation place; then six sequence decouplings are carried out to the fundametal compoment at double-circuit line two ends using six-sequence component; fault localization function finally is constructed using positive-sequence component in the same direction, fault location is carried out according to the phase characteristic of range function.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System field, concretely relate to a kind of based on positive-sequence component in the same direction
Parallel erected on same tower double-circuit line Fault Locating Method.
Background technology
With the development and the continuous expansion of net capacity of power technology, the remote trans-regional transmission of electricity of Large Copacity turns into electricity
The developing direction that can be conveyed.Parallel erected on same tower double-circuit line is big with its conveying capacity, and low engineering cost, transmission line corridor is narrow, takes up an area face
Product is few, the advantage such as the construction period is short, is widely applied in actual motion and planning construction, and as super UHV transmission
Development trend.Due to the extensive use and the requirement of system safety and stability of double-circuit lines on the same pole, corresponding fault localization is ground
Study carefully and also have become hot issue of concern.After failure generation, fast and accurately fault localization is for timely repair line
Road, the reliability tool for reducing economic loss, restoring electricity as early as possible and improving power system are of great significance.
Parallel erected on same tower double-circuit line is close due to wire spacing, does not only exist alternate mutual inductance between two loop lines, also exists between line
Couple mutual inductance.In addition to occurring single line down except any loop line road, it also occur that as thunder and lightning and caused by the factor such as bar across
Line failure.The problems such as serious, fault type is various and complicated is coupled between line to bring to the fault location of parallel erected on same tower double-circuit line
Certain difficulty, it is impossible to simply the Fault Locating Method of single back line is applied in double-circuit line.
Existing double-circuit line Fault Location Algorithm is mainly included by principle point：Intelligentized method, travelling wave ranging method and event
Hinder analytic approach.Manual intelligent method carries out fault localization using the advanced achievements of related discipline, but complete not enough in principle
It is kind and ripe, at present still in the exploratory stage.Travelling wave ranging method carries out ranging using the transmission property of fault transient travelling wave, no
Influenceed by circuit types, impedance ground, system oscillation and both sides systematic parameter, but need to configure special high-speed sampling equipment,
Its hardware is put into and cost is larger, technical sophistication.Fault analytical method utilizes the electricity measured when system relevant parameter and line fault
Pressure, electric current, obtain fault distance by analysis and calculating, can be divided into one-terminal data again according to information source different faults analytic approach
Method and both-end amount method.One-terminal data method utilizes line one-end electrical quantity ranging, is transmitted without communication equipment to client information, but difficult
To eliminate the influence of system impedance and transition resistance to algorithm, range accuracy can not meet requirement.Both-end amount method is from principle on gram
Above-mentioned drawback has been taken, but calculating process is typically more complicated, it is necessary to be iterated search and pseudo- root identification, and amount of calculation is larger.
The content of the invention
The purpose of the present invention is to overcome the deficiencies in the prior art double there is provided a kind of parallel erected on same tower based on positive-sequence component in the same direction
Loop line road Fault Locating Method.
A kind of parallel erected on same tower double-circuit line Fault Locating Method based on positive-sequence component in the same direction, it is characterised in that sharp first
With protection installation place electric power mutual-inductor collection failure occur after parallel erected on same tower double-circuit line system two ends six-phase voltage amount and
The magnitude of current, then carries out six sequence decouplings using six-sequence component to the fundametal compoment at double-circuit line two ends, finally using in the same direction just
Order components construct fault localization function, and fault location is carried out according to the phase characteristic of range function.Comprise the following steps that：
(1) parallel erected on same tower double-circuit line system two after occurring first with the electric power mutual-inductor collection failure of protection installation place
The six-phase voltage amount at endWith six phase current amountsWherein I represents the first loop line, and II represents the second loop line, φ
For A phases or B phases or C phases；
(2) the six phase electrical quantity at double-circuit line two ends are converted into six independent sequences point using Metzler matrix given below
Amount：T1 positive-sequence components in the same direction, T2 negative sequence components in the same direction, T0 zero-sequence components in the same direction, the reverse positive-sequence components of F1, F2 reverse negative phase-sequences point
Amount, the reverse zero-sequence components of F0.
In formula A=ej120°°
(3) the positive sequence voltage amount in the same direction of circuit N-terminal is utilizedForward-order current amount in the same directionCalculate the in the same direction of circuit M ends
Positive sequence electrical quantityCalculating formula is as follows：
In formula,For circuit positive sequence transmission in the same direction,For circuit positive sequence wave impedance in the same direction, Z1For
Circuit unit length positive sequence impedance in the same direction, Y1For the positive sequence admittance in the same direction of circuit unit length, lMNFor double-circuit line MN length.
(4) range function is calculatedWherein lMfFor trouble point to M ends
Distance.
(5) distance for utilizing (4) to calculate trouble point to M ends isWherein β is circuit positive sequence in the same direction
Transmission γT1Imaginary part, angle () is takes phase function.
Beneficial effects of the present invention：
(1) positive sequence network in the same direction after being decomposed using six-sequence component carries out ranging, is not influenceed by mutual inductance between parallel lines,
Failure can be also positioned without mutual inductance parameter between line；By positive-sequence component in the same direction, to be present in parallel erected on same tower double-circuit line institute faulty
During the whole failure of type, location algorithm can be accurately positioned to any failure.
(2) carry out ranging using the linear phase characteristic of range function, occur without pseudo- root from principle, distance measurement result not by
The influence of the factors such as transition resistance, system impedance, load current.
(3) principle is simple, directly obtains abort situation according to the phase characteristic of range function, it is not necessary to be iterated search
Recognized with pseudo- root, required operand is small, range accuracy is high.
Brief description of the drawings
Fig. 1 parallel erected on same tower double-circuit line schematic diagrames
Fig. 2 double-circuit lines positive sequence network schematic diagram in the same direction
The implication of each label in accompanying drawing and in word：
For m ends electrical source voltage,For n ends electrical source voltage；
For the positive sequence voltage amount in the same direction of circuit M sides；
For the forward-order current amount in the same direction of circuit M sides；
For the positive sequence voltage amount in the same direction of circuit N sides；
For the forward-order current amount in the same direction of circuit N sides；
For forward-order current amount in the same direction from circuit M effluents to trouble point；
For forward-order current amount in the same direction from circuit N effluents to trouble point；
For trouble point positive sequence voltage amount in the same direction；
For the positive-sequence component in the same direction of fault current.
Embodiment
The content of the invention of the present invention is done below according to Figure of description and further calculates statement in detail.
Fig. 1 is the parallel erected on same tower double-circuit line schematic diagram of the application present invention.Due to being coupled between parallel erected on same tower double loop route
Seriously, therefore first using six-sequence component the double loop that there is mutual inductance between alternate mutual inductance and line be decoupled into six it is separate
Sequence net.Positive-sequence component in the same direction is present in all fault types in double loop, therefore the present invention is carried out using positive sequence net in the same direction
Fault localization, Fig. 2 is the double loop positive sequence network in the same direction after failure occurs.
When parallel erected on same tower double loop system breaks down in f points, according to long-line equation, the positive sequence in the same direction at the f of trouble point
Voltage and the forward-order current in the same direction of N sides inflow trouble point are respectively：
Wherein,WithThe respectively positive sequence voltage amount in the same direction and forward-order current amount in the same direction of circuit N sides；For failure
Point positive sequence voltage amount in the same direction；For forward-order current amount in the same direction from circuit N effluents to trouble point；γT1And ZcT1Respectively in the same direction just
Sequence transmission and wave impedance.
As shown in Figure 1：
WhereinFor forward-order current amount in the same direction from circuit M effluents to trouble point；For the positive sequence in the same direction point of fault current
Amount.
The positive sequence voltage actual value formula in the same direction at M ends is：
Formula (1) and formula (2) are substituted into formula (3) to obtain：
Wherein,For the actual positive sequence voltage amount in the same direction at circuit M ends；For according to long-line equation by N-terminal in the same direction just
The M ends positive sequence voltage amount in the same direction that order components are derived；lMfAnd lNfRespectively circuit M ends and N-terminal is to the distance of trouble point, lMf+lNf
=lMN。
Obtained by formula (3) and formula (4)：
Line side flows to the forward-order current actual value formula in the same direction at M ends such as shown in (6)：
Formula (1) and formula (2) are substituted into formula (6) to obtain:
Wherein,The actual forward-order current amount in the same direction at M ends is flowed to for line side；To be same by N-terminal according to long-line equation
The M ends forward-order current amount in the same direction derived to positive-sequence component.
Have again at M ends：
Formula (8) is substituted into formula (7) and arranged：
The function expression of following representing fault electric current can be write out using formula (5) and formula (9)：
One fault localization function is constructed according to formula (5) and formula (9), formula (11) is seen.
Wherein, lMfFor positive number,WithThe respectively positive sequence voltage amount in the same direction and forward-order current amount in the same direction of circuit M sides.WithElectric expression formula be respectively：
The transmission of high-tension overhead line can be written asWherein r0、
L0、C0The respectively resistance value of circuit unit length, inductance value and capacitance, α is attenuation constant, and β is phase coefficient.
With abs [f (lMf)] and angle [f (lMf)] represent the amplitude and phase angle of range function respectively, then range function
Amplitude and phase angle can further abbreviation into formula (12) and the real number expression-form of formula (13).
Because the line resistance value of ultra-high-tension power transmission line is very small, i.e. attenuation constant α value very little is close to zero, therefore profit
It is that formula (12) carries out ranging and can bring certain error with the amplitude characteristic of range function.In order to avoid by transmission institute
The measurement error caused, the present invention carries out fault localization, i.e. ranging letter using the phase characteristic of range function is formula (13)
Number angle values are directly proportional to fault distance.
Utilize (13) to obtain the distance at trouble point to M ends to be
Claims (1)
1. a kind of parallel erected on same tower double-circuit line Fault Locating Method based on positive-sequence component in the same direction, it is characterised in that first with
Protect the six-phase voltage amount and electricity at parallel erected on same tower double-circuit line system two ends after the electric power mutual-inductor collection failure generation of installation place
Flow, then carries out six sequence decouplings to the fundametal compoment at double-circuit line two ends using six-sequence component, finally utilizes positive sequence in the same direction
Component construction fault localization function, fault location is carried out according to the phase characteristic of range function.Step is as follows：
(1) parallel erected on same tower double-circuit line system two ends after occurring first with the electric power mutual-inductor collection failure of protection installation place
Six-phase voltage amountWith six phase current amountsWherein I represents the first loop line, and II represents the second loop line, and φ is A phases
Or B phases or C phases；
(2) the six phase electrical quantity at double-circuit line two ends are converted into six independent order components using Metzler matrix given below：T1
Positive-sequence component in the same direction, T2 negative sequence components in the same direction, T0 zero-sequence components in the same direction, the reverse positive-sequence components of F1, the reverse negative sequence components of F2, F0 is anti-
To zero-sequence component；
In formula A=ej120°；
(3) the positive sequence voltage amount in the same direction of circuit N-terminal is utilizedForward-order current amount in the same directionCalculate the positive sequence in the same direction at circuit M ends
Electrical quantityCalculating formula is as follows：
In formula,For circuit positive sequence transmission in the same direction,For circuit positive sequence wave impedance in the same direction, Z1For circuit
Unit length positive sequence impedance in the same direction, Y1For the positive sequence admittance in the same direction of circuit unit length, lMNFor double-circuit line MN length；
(4) range function is calculatedWherein lMfFor the distance of trouble point to M ends；
(5) distance for utilizing (4) to calculate trouble point to M ends isWherein β is circuit positive sequence transmission in the same direction
Constant γT1Imaginary part, angle () is takes phase function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710413795.2A CN107271842B (en) | 2017-06-05 | 2017-06-05 | same-tower parallel-frame double-circuit line fault positioning method based on same-direction positive sequence component |
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| CN201710413795.2A CN107271842B (en) | 2017-06-05 | 2017-06-05 | same-tower parallel-frame double-circuit line fault positioning method based on same-direction positive sequence component |
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| CN107271842B CN107271842B (en) | 2019-12-10 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108092245A (en) * | 2018-01-09 | 2018-05-29 | 国网江苏省电力有限公司无锡供电分公司 | A kind of high voltage transmission line line protection device and method |
| CN108362978A (en) * | 2018-03-08 | 2018-08-03 | 国网山东省电力公司滨州供电公司 | A kind of T-type power transmission line fault locating method based on range function phase characteristic |
| CN109655710A (en) * | 2018-12-03 | 2019-04-19 | 国网江苏省电力有限公司检修分公司 | Double circuits on same tower transmission line of electricity both ends measure the bearing calibration of phasor, apparatus and system |
| CN109839569A (en) * | 2019-02-27 | 2019-06-04 | 燕山大学 | A kind of double circuit lines distance measuring method and system based on six-sequence component |
| CN110361632A (en) * | 2019-08-05 | 2019-10-22 | 大唐水电科学技术研究院有限公司 | A kind of part coupling asynchronous fault distance-finding method of double-circuit line on same pole |
| CN112363009A (en) * | 2020-10-14 | 2021-02-12 | 中国电力科学研究院有限公司 | Single-ended fault location method and system for same-tower line grounding fault |
| CN112684374A (en) * | 2020-11-11 | 2021-04-20 | 大唐水电科学技术研究院有限公司 | Fault analysis method for same-phase overline disconnection of four circuit lines on same tower |
| CN115267641A (en) * | 2022-09-22 | 2022-11-01 | 武汉格蓝若智能技术有限公司 | Method and system for identifying error abnormity of current transformer in same-tower double-circuit power transmission line |
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| CA2752363A1 (en) * | 2010-09-16 | 2012-03-16 | Schweitzer Engineering Laboratories, Inc. | Fault location in a non-homogeneous electric power line |
| CN102914726A (en) * | 2012-11-07 | 2013-02-06 | 华北电力大学（保定） | Fault positioning method for common-tower double-circuit line |
| CN105929302A (en) * | 2016-04-13 | 2016-09-07 | 上海交通大学 | Sequence component relation based range finding method for single-end fault of power transmission line |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2752363A1 (en) * | 2010-09-16 | 2012-03-16 | Schweitzer Engineering Laboratories, Inc. | Fault location in a non-homogeneous electric power line |
| CN102914726A (en) * | 2012-11-07 | 2013-02-06 | 华北电力大学（保定） | Fault positioning method for common-tower double-circuit line |
| CN105929302A (en) * | 2016-04-13 | 2016-09-07 | 上海交通大学 | Sequence component relation based range finding method for single-end fault of power transmission line |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108092245A (en) * | 2018-01-09 | 2018-05-29 | 国网江苏省电力有限公司无锡供电分公司 | A kind of high voltage transmission line line protection device and method |
| CN108092245B (en) * | 2018-01-09 | 2023-07-21 | 国网江苏省电力有限公司无锡供电分公司 | High-voltage transmission line protection device and method |
| CN108362978A (en) * | 2018-03-08 | 2018-08-03 | 国网山东省电力公司滨州供电公司 | A kind of T-type power transmission line fault locating method based on range function phase characteristic |
| CN109655710A (en) * | 2018-12-03 | 2019-04-19 | 国网江苏省电力有限公司检修分公司 | Double circuits on same tower transmission line of electricity both ends measure the bearing calibration of phasor, apparatus and system |
| CN109655710B (en) * | 2018-12-03 | 2020-12-01 | 国网江苏省电力有限公司检修分公司 | Correction method, device and system for phasor measurement at two ends of same-pole double-circuit transmission line |
| CN109839569A (en) * | 2019-02-27 | 2019-06-04 | 燕山大学 | A kind of double circuit lines distance measuring method and system based on six-sequence component |
| CN110361632A (en) * | 2019-08-05 | 2019-10-22 | 大唐水电科学技术研究院有限公司 | A kind of part coupling asynchronous fault distance-finding method of double-circuit line on same pole |
| CN112363009A (en) * | 2020-10-14 | 2021-02-12 | 中国电力科学研究院有限公司 | Single-ended fault location method and system for same-tower line grounding fault |
| CN112363009B (en) * | 2020-10-14 | 2023-12-01 | 中国电力科学研究院有限公司 | Single-ended fault location method and system for same-tower line ground fault |
| CN112684374A (en) * | 2020-11-11 | 2021-04-20 | 大唐水电科学技术研究院有限公司 | Fault analysis method for same-phase overline disconnection of four circuit lines on same tower |
| CN115267641A (en) * | 2022-09-22 | 2022-11-01 | 武汉格蓝若智能技术有限公司 | Method and system for identifying error abnormity of current transformer in same-tower double-circuit power transmission line |
| CN115267641B (en) * | 2022-09-22 | 2023-01-17 | 武汉格蓝若智能技术有限公司 | Method and system for identifying error abnormity of current transformer in same-tower double-circuit power transmission line |
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