CN103293433A - Transition resistance and load current influence resisting line inter-phase fault single-terminal location method - Google Patents
Transition resistance and load current influence resisting line inter-phase fault single-terminal location method Download PDFInfo
- Publication number
- CN103293433A CN103293433A CN2013101858890A CN201310185889A CN103293433A CN 103293433 A CN103293433 A CN 103293433A CN 2013101858890 A CN2013101858890 A CN 2013101858890A CN 201310185889 A CN201310185889 A CN 201310185889A CN 103293433 A CN103293433 A CN 103293433A
- Authority
- CN
- China
- Prior art keywords
- phase
- fault
- inter
- line protection
- transmission line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Locating Faults (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a transition resistance and load current influence resisting line inter-phase fault single-terminal location method. The transition resistance and load current influence resisting line inter-phase fault single-terminal location method includes computing the line distance from a power transmission line protection setting range to an inter-phase short-circuit fault point by the aid of fault inter-phase voltages, fault inter-phase currents and fault inter-phase negative-sequence currents at a power transmission line protection mounting position; subtracting the line distance from the power transmission line protection setting range to the inter-phase short-circuit fault point from the power transmission line protection setting range to obtain the fault distance from the power transmission line protection mounting position to the inter-phase short-circuit fault point. The transition resistance and load current influence resisting line inter-phase fault single-terminal location method has the advantages that power transmission line inter-phase fault single-terminal location is implemented by the aid of single-terminal electric quantities, and the location precision is unaffected by transition resistance or load currents and is high; a searching mode is adopted in the method, the problem of false roots of an equation solving method and the problem of incapability of realizing convergence of an iterative method are solved, and the practicality is high.
Description
Technical field
The present invention relates to the relay protection of power system technical field, specifically relate to the circuit phase-to phase fault method of single end distance measurement of a kind of anti-transition resistance and load current influence.
Background technology
The transmission line of electricity one-end fault ranging method only utilizes transmission line of electricity one end electric parameters to carry out localization of fault, need not communication and data sync equipment, and operating cost is low and algorithm stable, obtains widespread use in high, normal, basic pressure transmission line.At present, method of single end distance measurement mainly is divided into traveling wave method and impedance method.Traveling wave method utilizes the transmission character of fault transient travelling wave to carry out one-end fault ranging, and the precision height is not influenced by the method for operation, excessive resistance etc., but very high to the sampling rate requirement, needs special wave recording device, application cost height.Impedance method utilizes voltage, the magnitude of current after the fault to calculate the fault loop impedance, carry out one-end fault ranging according to the characteristic that line length is directly proportional with impedance, algorithm is simple and reliable, but it is serious that distance accuracy is subjected to factor affecting such as transition resistance and load current, when especially transition resistance is big, impedance method range finding result understands substantial deviation true fault distance, even appearance range finding failure, can't provide reliable reference frame for the transmission line malfunction line walking, be unfavorable for that transmission line malfunction searches fast, gets rid of, influence electrical network to the normal power supply of load.
Summary of the invention
The objective of the invention is to overcome the deficiency that prior art exists, the circuit phase-to phase fault method of single end distance measurement of a kind of anti-transition resistance and load current influence is provided.
The circuit phase-to phase fault method of single end distance measurement of anti-transition resistance and load current influence is characterized in that, comprises following sequential steps:
(1) the fault voltage between phases of protector measuring line protection installation place
, the fault three-phase current
Alternate negative-sequence current with fault
, as input quantity; Wherein, Φ Φ=AB, BC, CA phase;
(2) protective device computing electric power line protection setting range place arrives the circuit distance, delta x of phase fault point:
Wherein, z
1Be unit length transmission line of electricity positive sequence impedance; x
SetBe the line protection setting range; β=Arg (z
1) be unit length transmission line of electricity positive sequence impedance z
1Phase angle;
For
Leading
Angle;
For
Leading
Angle; Φ Φ=AB, BC, CA phase;
(3) protective device utilizes line protection setting range x
SetDeduct line protection setting range place and obtain the line protection installation place to the fault distance x of phase fault point to the circuit distance, delta x of phase fault point:
The present invention has following positive achievement compared with prior art:
The inventive method at first utilizes the alternate negative-sequence current computing electric power line with fault of fault voltage between phases, the fault three-phase current of line protection installation place protection setting range place to the circuit distance of phase fault point, utilizes the line protection setting range to deduct line protection setting range place then and arrives the fault distance of phase fault point to the circuit of phase fault point apart from obtaining the line protection installation place.The inventive method utilizes single-end electrical quantity to realize the single end distance measurement of transmission line of electricity phase-to phase fault, and distance accuracy is not subjected to the influence of transition resistance and load current, has very high distance accuracy.The inventive method is a kind of method of search type, does not have the pseudo-root problem of the method for solving equation and the not convergence problem of process of iteration, has very strong practicality.
Description of drawings
Fig. 1 is for using circuit transmission system synoptic diagram of the present invention.
Embodiment
Below in conjunction with embodiment technical scheme of the present invention is done further detailed presentations.
Fig. 1 is for using circuit transmission system synoptic diagram of the present invention.CVT is that voltage transformer (VT), CT are current transformer among Fig. 1.Protective device is sampled to the current waveform of the voltage and current mutual inductor CT of the voltage transformer (VT) CVT of line protection installation place and is obtained voltage, current instantaneous value, and protective device utilizes the fault voltage between phases of Fourier algorithm computing electric power line protection installation place to its voltage that collects, current instantaneous value then
, the fault three-phase current
Alternate negative-sequence current with fault
, as input quantity; Wherein, Φ Φ=AB, BC, CA phase.
Protective device computing electric power line protection setting range place arrives the circuit distance, delta x of phase fault point:
Wherein, z
1Be unit length transmission line of electricity positive sequence impedance; x
SetBe the line protection setting range; β=Arg (z
1) be unit length transmission line of electricity positive sequence impedance z
1Phase angle;
For
Leading
Angle;
For
Leading
Angle; Φ Φ=AB, BC, CA phase.
Protective device utilizes line protection setting range x
SetDeduct line protection setting range place and obtain the line protection installation place to the fault distance x of phase fault point to the circuit distance, delta x of phase fault point:
The inventive method utilizes single-end electrical quantity to realize the single end distance measurement of transmission line of electricity phase-to phase fault, and distance accuracy is not subjected to the influence of transition resistance and load current, has very high distance accuracy.The inventive method is a kind of method of search type, does not have the pseudo-root problem of the method for solving equation and the not convergence problem of process of iteration, has very strong practicality.
The above only is preferred embodiment of the present invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses, the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (1)
1. the circuit phase-to phase fault method of single end distance measurement of an anti-transition resistance and load current influence is characterized in that, comprises following sequential steps:
(1) the fault voltage between phases of protector measuring line protection installation place
, the fault three-phase current
Alternate negative-sequence current with fault
, as input quantity; Wherein, Φ Φ=AB, BC, CA phase;
(2) protective device computing electric power line protection setting range place arrives the circuit distance, delta x of phase fault point:
Wherein, z
1Be unit length transmission line of electricity positive sequence impedance; x
SetBe the line protection setting range; β=Arg (z
1) be unit length transmission line of electricity positive sequence impedance z
1Phase angle;
For
Leading
Angle;
For
Leading
Angle; Φ Φ=AB, BC, CA phase;
(3) protective device utilizes line protection setting range x
SetDeduct line protection setting range place and obtain the line protection installation place to the fault distance x of phase fault point to the circuit distance, delta x of phase fault point:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101858890A CN103293433A (en) | 2013-05-19 | 2013-05-19 | Transition resistance and load current influence resisting line inter-phase fault single-terminal location method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101858890A CN103293433A (en) | 2013-05-19 | 2013-05-19 | Transition resistance and load current influence resisting line inter-phase fault single-terminal location method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103293433A true CN103293433A (en) | 2013-09-11 |
Family
ID=49094641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013101858890A Pending CN103293433A (en) | 2013-05-19 | 2013-05-19 | Transition resistance and load current influence resisting line inter-phase fault single-terminal location method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103293433A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103760470A (en) * | 2014-02-18 | 2014-04-30 | 国家电网公司 | Electric transmission line inter-phase short circuit fault direction discriminating method based on discrete sampled values |
| CN104953565A (en) * | 2015-06-17 | 2015-09-30 | 国家电网公司 | Relay protection method based on transition resistance actually measured line interphase fault |
| CN104090200B (en) * | 2014-07-15 | 2016-08-24 | 国家电网公司 | Double-circuit line non-same famous prime minister's cross-line earth fault single-ended amplitude distance-finding method |
| CN106680733A (en) * | 2016-12-02 | 2017-05-17 | 华北电力大学 | Two-terminal flexible direct-current system fault ranging method based on single terminal voltage oscillation characteristics |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040032265A1 (en) * | 2002-06-14 | 2004-02-19 | Progress Energy Service Company | Double-ended distance-to-fault location system using time-synchronized positive-or negative-sequence quantities |
| CN101672883A (en) * | 2009-08-20 | 2010-03-17 | 北京四方继保自动化股份有限公司 | Overhead and cable mixed power transmission line fault locating method and device |
| CN102253315A (en) * | 2011-06-28 | 2011-11-23 | 中电普瑞科技有限公司 | Fault location method based on single-terminal location |
| CN102707197A (en) * | 2012-06-11 | 2012-10-03 | 福建省电力有限公司检修分公司 | Distance measuring method and type diagnostic method of single-phase grounding fault of electric transmission line |
| CN103091605A (en) * | 2013-01-31 | 2013-05-08 | 福建省电力有限公司 | Method using dynamic extraction coefficient to realize line inter-phase single-terminal fault location |
| CN103107524A (en) * | 2013-01-31 | 2013-05-15 | 福建省电力有限公司 | Electric transmission line phase fault relay protection method |
-
2013
- 2013-05-19 CN CN2013101858890A patent/CN103293433A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040032265A1 (en) * | 2002-06-14 | 2004-02-19 | Progress Energy Service Company | Double-ended distance-to-fault location system using time-synchronized positive-or negative-sequence quantities |
| CN101672883A (en) * | 2009-08-20 | 2010-03-17 | 北京四方继保自动化股份有限公司 | Overhead and cable mixed power transmission line fault locating method and device |
| CN102253315A (en) * | 2011-06-28 | 2011-11-23 | 中电普瑞科技有限公司 | Fault location method based on single-terminal location |
| CN102707197A (en) * | 2012-06-11 | 2012-10-03 | 福建省电力有限公司检修分公司 | Distance measuring method and type diagnostic method of single-phase grounding fault of electric transmission line |
| CN103091605A (en) * | 2013-01-31 | 2013-05-08 | 福建省电力有限公司 | Method using dynamic extraction coefficient to realize line inter-phase single-terminal fault location |
| CN103107524A (en) * | 2013-01-31 | 2013-05-15 | 福建省电力有限公司 | Electric transmission line phase fault relay protection method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103760470A (en) * | 2014-02-18 | 2014-04-30 | 国家电网公司 | Electric transmission line inter-phase short circuit fault direction discriminating method based on discrete sampled values |
| CN104090200B (en) * | 2014-07-15 | 2016-08-24 | 国家电网公司 | Double-circuit line non-same famous prime minister's cross-line earth fault single-ended amplitude distance-finding method |
| CN104953565A (en) * | 2015-06-17 | 2015-09-30 | 国家电网公司 | Relay protection method based on transition resistance actually measured line interphase fault |
| CN106680733A (en) * | 2016-12-02 | 2017-05-17 | 华北电力大学 | Two-terminal flexible direct-current system fault ranging method based on single terminal voltage oscillation characteristics |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103293439B (en) | Based on distribution parameter measurement impedance magnitude characteristic line single-phase earth fault single-terminal location method | |
| CN104965151B (en) | A kind of fault distance-finding method based on fault point voltage Sudden Changing Rate | |
| CN106501675B (en) | The wind farm grid-connected instantaneous singlephase earth fault method of single end distance measurement of transmission line of electricity | |
| CN103219711B (en) | A kind of analyses for double circuits on same tower earth fault distance protecting method | |
| CN104020395A (en) | Method for accurately measuring distance of single-phase earth fault for small current grounding system | |
| CN103207354A (en) | Maximum line selection coefficient principle based single-phase earth fault line selection method for power distribution network | |
| CN103245878A (en) | Single-end distance measurement method for electric transmission line single-phase earth fault | |
| CN103293433A (en) | Transition resistance and load current influence resisting line inter-phase fault single-terminal location method | |
| CN103293445A (en) | Line inter-phase fault single-terminal location method implemented by aid of measured impedance amplitude characteristics of distributed parameters | |
| CN103293441B (en) | Distribution parameter is utilized to realize line single-phase earth fault single-terminal location method | |
| CN103245877B (en) | Method for ranging single-phase earth fault of line by using single-end electric quantity | |
| CN103323739B (en) | Based on distribution parameter measurement impedance magnitude characteristic circuit inter-phase fault single-end ranging | |
| CN103245887B (en) | Lumped parameter is utilized to realize circuit inter-phase fault single-end ranging | |
| CN103207353B (en) | Based on the line inter-phase fault distance measurement method of dis-crete sample values | |
| CN103293444A (en) | Transition resistance and load current influence resisting line single-phase earth fault single-terminal location method | |
| CN103278742A (en) | Line single-phase earthing fault single-end ranging method realized by utilizing voltage drop imaginary part characteristics | |
| CN103267929B (en) | Voltage drop imaginary part characteristic is utilized to realize circuit inter-phase fault single-end ranging | |
| CN103091605B (en) | Method using dynamic extraction coefficient to realize line inter-phase single-terminal fault location | |
| CN103245876A (en) | Method for realizing line interphase fault single-ended distance measurement by means of real part characteristics of voltage drop | |
| CN103245890A (en) | Line single-phase ground fault single-terminal location method capable of preventing influences of both transitional resistance and load current | |
| CN103163427A (en) | Method for realizing line single-phase earth fault single-terminal fault locating by using real part of voltage drop along line | |
| CN103293440A (en) | Line single-phase earth fault single-terminal ranging method implemented by aid of sequence components | |
| CN103217630A (en) | Method of achieving single-phase ground fault single-end distance measurement of line by means of voltage drop real part characteristics | |
| CN104764977A (en) | Phase characteristic line phase-to-phase fault single-ended positioning method based on impedance positioning functions | |
| CN103777116A (en) | Line interphase fault positioning method by using phase step characteristics between voltages before and after fault |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20130911 |
|
| RJ01 | Rejection of invention patent application after publication |