CN105929302A - Sequence component relation based range finding method for single-end fault of power transmission line - Google Patents
Sequence component relation based range finding method for single-end fault of power transmission line Download PDFInfo
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- CN105929302A CN105929302A CN201610227274.3A CN201610227274A CN105929302A CN 105929302 A CN105929302 A CN 105929302A CN 201610227274 A CN201610227274 A CN 201610227274A CN 105929302 A CN105929302 A CN 105929302A
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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
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Abstract
The invention relates to a sequence component relation based range finding method for a single-end fault of a power transmission line. A replay protector is used to determine a fault type, the sequence component relation in positive, negative and zero-sequence network is determined according to the fault type, sequence electrical quantities at the measuring end are used to calculate sequence electric quantities at the fault point, and the sequence electric quantities of the fault point are substituted into the sequence component relation to solve a fault distance. The method can be used to overcome the problems that data is asynchronous and false root exists, and maintains high range finding precision.
Description
Technical field
The present invention relates to the technology of a kind of field of relay protection in power, specifically a kind of based on order components relation
Transmission line of electricity one-end fault ranging method.
Background technology
Ultra-high-tension power transmission line is the lifeblood of power system, while undertaking important transmission of electricity task, is again power system
In be highly prone to fault impact a ring.Power supply is caused to stop if transmission line malfunction can not excise in time, power system
The development of stable operation or even national economy all can be severely impacted.
The fault localization of transmission line of electricity is the important step that maintenance line is stable.Existing conventional distance-finding method includes impedance
Method, traveling wave method and fault analytical method.Relative to other two kinds of methods, impedance method is easy and simple to handle, and cost is relatively low, receives more
Favor.Impedance method can be divided into single-ended method and two kinds of methods of both-end method according to the Data Position used.Wherein both-end method due to
Need to utilize dual ended data to synchronize, communication system is proposed higher requirement, adds the cost of fault localization.And single-ended method
Have only to this side data and can complete range finding, be not required to data syn-chronization, cost can be significantly reduced.
Symmetrical component method is a kind of basic skills analyzing balanced system asymmetric operation state in electrician.It is widely used in
Three-phase alternating current systematic parameter is symmetrical, the asymmetric electric parameters of operation conditions calculates.During owing to breaking down, system is generally in not
Symmetrical operation state, symmetrical component method has broad application prospects in fault localization.
Summary of the invention
The present invention is directed to deficiencies of the prior art, propose a kind of transmission line of electricity based on order components relation single-ended
Fault distance-finding method, is judged the fault type occurred, determines in positive and negative, zero sequence according to fault type by protective relaying device
Order components relation in network, utilizes each sequence electrical component measuring end to calculate fault point each sequence electrical component, by trouble point
Locate each order components to substitute into order components relation and can solve and obtain fault distance.The present invention is overcoming communication issue, data are asynchronous,
Relatively costly, there is the problems such as pseudo-root while, maintain accurate range accuracy.
The present invention is achieved by the following technical solutions:
The present invention utilize measure end measurement to electric parameters be calculated each order components of trouble point, filled by relay protection
Put and judge that the fault type that obtains obtains corresponding trouble point order components relation and is calculated fault distance, it is achieved single-ended impedance is surveyed
Away from.
The present invention specifically includes:
Step one, when breaking down in ultra-high-tension power transmission line range measurement end M point somewhere, protective relaying device action, and
Record fault type now；
Described fault type includes: single-line to ground fault, two-phase phase fault, two-phase grounding fault and three-phase shortcircuit,
Step 2, each phase voltage at M point can be recorded by mutual-inductance apparatusWith each phase current Each sequence voltage at M point is can be calculated through symmetrical component methodWith each sequence electric current
Particularly as follows:Wherein: α=ej120°。
Step 3, obtain each sequence voltage of fault point according to order components network calculationsWith each sequence electric current Particularly as follows:
Wherein: Zc0、Zc1With
γ0、γ1Being respectively circuit zero sequence, positive sequence or negative phase-sequence wave impedance and propagation coefficient, x represents actual fault distance.
Step 4, divided by the sequence of fault point corresponding to fault type according to being calculated each sequence voltage and each sequence electric current
Magnitude relation is calculated the transcendental equation containing x, is obtained the numerical approximation solution of x by the method for search finding, is measured
Fault distance.
The order components relation of the fault point that described fault type is corresponding includes: single-line to ground fault:
Two-phase phase fault:Two-phase grounding fault:Three
Short circuit mutually:
Technique effect
Present invention utilizes when ultra-high-tension power transmission line breaks down, also exist certain between the order components of fault point
Phase relation, this relation only fault point set up.And during fault generation, electrical component positive and negative, zero sequence often has aobvious
The change write, this measurement making order components and calculating ensure that certain precision.Finally use search to ask when solving equation
The mode solved, reason has two: the one equation is transcendental equation, it is impossible to try to achieve analytic solutions, and numerical solution solves existence necessarily
Difficulty；Its two search finding can be effectively prevented from pseudo-root problem.
The present invention is merely with single-end electrical quantity, it is not necessary to low with to end communication and equipment cost and have stronger robustness,
Affected less by transition resistance, fault initial angle and two end system merit angular differences, it is possible to avoid tradition distance-finding method there may be
Pseudo-root problem, ensure that certain range accuracy simultaneously.
Accompanying drawing explanation
Fig. 1 is ultra-high-tension power transmission line fault schematic diagram of the present invention；
In figure:For measuring end system electromotive force,For peer-to-peer system electromotive force；
Fig. 2 is the schematic diagram of each sequence network in fault；
In figure: ZMi、ZNiRepresent each sequence impedance of two side systems, Z respectivelyLiRepresenting circuit unit length impedance, l represents line
Road total length, x represents the distance of trouble point and M side, RFRepresent fault resistance,Represent each sequence electric current at M side bus,
Represent each sequence electric current flowing through transition resistance.Above-mentioned i=0,1,2 represents zero sequence, positive sequence and negative phase-sequence respectively.Note for above-mentioned resistance
For Kang, negative sequence impedance is equal with positive sequence impedance.
Fig. 3 is transmission line of electricity one-end fault ranging method schematic flow sheet based on order components relation；
Fig. 4 is embodiment transmission line of electricity schematic diagram；
Figure is one or three end systems, emulation being assumed, fault occurs on 220km circuit all the time, right side dual system is done
Imitate and process for triangular web.
Detailed description of the invention
As it is shown on figure 3, be the present embodiment 230kV transmission line of alternation current model, total track length 220km.Embodiment is as follows:
1) utilize PSCAD to build model, it is emulated.
2) at spacing M point 10.0km, 100.0km of MN, it is respectively provided with four kinds of faults.In fault, alternate transition resistance is
10 Ω, earth resistance is 100 Ω.
Table 1.230kV transmission line of alternation current model fault localization result
Above-mentioned be embodied as can by those skilled in the art on the premise of without departing substantially from the principle of the invention and objective with difference
Mode it is carried out local directed complete set, protection scope of the present invention is as the criterion with claims and is not embodied as institute by above-mentioned
Limit, each implementation in the range of it is all by the constraint of the present invention.
Claims (4)
1. a transmission line of electricity one-end fault ranging method based on order components relation, it is characterised in that utilize and measure end measurement
To electric parameters be calculated each order components of trouble point, judge that the fault type obtained obtains accordingly by protective relaying device
Trouble point order components relation be calculated fault distance, it is achieved single-ended impedance find range.
Distance-finding method the most according to claim 1, is characterized in that, specifically includes following steps:
Step one, when breaking down in ultra-high-tension power transmission line range measurement end M point somewhere, protective relaying device action, and record
Under fault type now；
Step 2, each phase voltage at M point can be recorded by mutual-inductance apparatusWith each phase current
Each sequence voltage at M point is can be calculated through symmetrical component methodWith each sequence electric currentParticularly as follows:Wherein: α=ej120°。
Step 3, obtain each sequence voltage of fault point according to order components network calculationsWith each sequence electric current Particularly as follows: Wherein: Zc0、Zc1And γ0、γ1
Being respectively circuit zero sequence, positive sequence or negative phase-sequence wave impedance and propagation coefficient, x represents actual fault distance；
Step 4, basis are calculated each sequence voltage and pass through the order components pass of fault point corresponding to fault type with each sequence electric current
System is calculated the transcendental equation containing x, is obtained the numerical approximation solution of x by the method for search finding, is measured event
Barrier distance.
Distance-finding method the most according to claim 1, is characterized in that, described fault type includes: single-line to ground fault, two
Phase phase fault, two-phase grounding fault and three-phase shortcircuit.
4., according to the distance-finding method described in claim 1 or 3, it is characterized in that, the fault point that described fault type is corresponding
Order components relation includes: single-line to ground fault:Two-phase phase fault:
Two-phase grounding fault:Three-phase shortcircuit:
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| CN201610227274.3A CN105929302B (en) | 2016-04-13 | 2016-04-13 | Transmission line of electricity one-end fault ranging method based on order components relationship |
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| CN105929302B CN105929302B (en) | 2019-06-18 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271841A (en) * | 2017-05-27 | 2017-10-20 | 天津大学 | The T-shaped fault positioning method for transmission line of common-tower double-return based on forward-order current difference |
| CN107271842A (en) * | 2017-06-05 | 2017-10-20 | 天津大学 | A kind of parallel erected on same tower double-circuit line Fault Locating Method based on positive-sequence component in the same direction |
| CN107942197A (en) * | 2017-11-17 | 2018-04-20 | 国网四川省电力公司达州供电公司 | A kind of transmission line of electricity one-end fault ranging method |
| CN109100605A (en) * | 2018-10-23 | 2018-12-28 | 国网江苏省电力有限公司徐州供电分公司 | Utilize the single end positioning method of the high-tension cable singlephase earth fault of failure boundary condition |
| CN109142974A (en) * | 2018-08-31 | 2019-01-04 | 天津大学 | A kind of alternating current circuit one-end fault ranging method suitable for flexible direct current feed-in |
| CN111781468A (en) * | 2020-07-15 | 2020-10-16 | 国网宁夏电力有限公司营销服务中心(国网宁夏电力有限公司计量中心) | T-shaped high-voltage transmission line asynchronous fault distance measurement method and system |
| 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 |
| CN115469194A (en) * | 2022-11-14 | 2022-12-13 | 天津滨电电力工程有限公司 | Single-phase earth fault distance measurement method based on n-type equivalent circuit model single-end quantity |
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| CN101825678A (en) * | 2010-04-23 | 2010-09-08 | 华南理工大学 | Parameter adaptive failure distance measurement method for transmission line with four-circuit on single tower |
| JP2012198134A (en) * | 2011-03-22 | 2012-10-18 | Chugoku Electric Power Co Inc:The | Fault point locating device and program |
| CN103149502A (en) * | 2013-02-20 | 2013-06-12 | 保定浪拜迪电气股份有限公司 | Fault distance measuring and calculating method for power transmission line based on synchronous sampling device |
| CN103293440A (en) * | 2013-05-19 | 2013-09-11 | 国家电网公司 | Line single-phase earth fault single-terminal ranging method implemented by aid of sequence components |
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| CN101825678A (en) * | 2010-04-23 | 2010-09-08 | 华南理工大学 | Parameter adaptive failure distance measurement method for transmission line with four-circuit on single tower |
| JP2012198134A (en) * | 2011-03-22 | 2012-10-18 | Chugoku Electric Power Co Inc:The | Fault point locating device and program |
| CN103149502A (en) * | 2013-02-20 | 2013-06-12 | 保定浪拜迪电气股份有限公司 | Fault distance measuring and calculating method for power transmission line based on synchronous sampling device |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271841A (en) * | 2017-05-27 | 2017-10-20 | 天津大学 | The T-shaped fault positioning method for transmission line of common-tower double-return based on forward-order current difference |
| CN107271841B (en) * | 2017-05-27 | 2019-12-10 | 天津大学 | Same-tower double-circuit T-shaped power transmission line fault location method based on positive sequence current difference |
| CN107271842A (en) * | 2017-06-05 | 2017-10-20 | 天津大学 | A kind of parallel erected on same tower double-circuit line Fault Locating Method based on positive-sequence component in the same direction |
| CN107271842B (en) * | 2017-06-05 | 2019-12-10 | 天津大学 | same-tower parallel-frame double-circuit line fault positioning method based on same-direction positive sequence component |
| CN107942197A (en) * | 2017-11-17 | 2018-04-20 | 国网四川省电力公司达州供电公司 | A kind of transmission line of electricity one-end fault ranging method |
| CN109142974A (en) * | 2018-08-31 | 2019-01-04 | 天津大学 | A kind of alternating current circuit one-end fault ranging method suitable for flexible direct current feed-in |
| CN109100605A (en) * | 2018-10-23 | 2018-12-28 | 国网江苏省电力有限公司徐州供电分公司 | Utilize the single end positioning method of the high-tension cable singlephase earth fault of failure boundary condition |
| CN111781468A (en) * | 2020-07-15 | 2020-10-16 | 国网宁夏电力有限公司营销服务中心(国网宁夏电力有限公司计量中心) | T-shaped high-voltage transmission line asynchronous fault distance measurement method and system |
| CN111781468B (en) * | 2020-07-15 | 2022-11-22 | 国网宁夏电力有限公司营销服务中心(国网宁夏电力有限公司计量中心) | Asynchronous fault distance measurement method and system for T-shaped high-voltage transmission line |
| 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 |
| CN115469194A (en) * | 2022-11-14 | 2022-12-13 | 天津滨电电力工程有限公司 | Single-phase earth fault distance measurement method based on n-type equivalent circuit model single-end quantity |
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