CN103779847B - Based on the guard method of SV network samples common-tower double-circuit lines single-phase earthing voltage ratio phase - Google Patents
Based on the guard method of SV network samples common-tower double-circuit lines single-phase earthing voltage ratio phase Download PDFInfo
- Publication number
- CN103779847B CN103779847B CN201410053655.5A CN201410053655A CN103779847B CN 103779847 B CN103779847 B CN 103779847B CN 201410053655 A CN201410053655 A CN 201410053655A CN 103779847 B CN103779847 B CN 103779847B
- Authority
- CN
- China
- Prior art keywords
- phase
- line road
- loop line
- protection
- zero
- 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.)
- Active
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of based on the guard method of SV network samples common-tower double-circuit lines single-phase earthing voltage ratio phase, measure I loop line road faulted phase voltage, I loop line road faulted phase current, I loop line road zero-sequence current, other two normal phases voltages of I loop line road, the II loop line road zero-sequence current of common-tower double-circuit lines protection installation place; Faulted phase voltage when utilizing normal phase voltage calculation I loop line road, I loop line road two normally to run; calculate the faulted phase voltage at protection seting scope place, I loop line road; judge that the phase angle of faulted phase voltage when faulted phase voltage leading I loop line road at protection seting scope place, I loop line road is normally run drops on (-90 °; 90 °) whether set up in scope; if set up; then judge single phase ground fault to occur, the circuit breaker at two ends, protective device tripping I loop line road within the scope of the protection seting of I loop line road.To this invention removes between line zero-sequence mutual inductance impedance to the impact of Perfomance of protective relaying, not misoperation, have the ability of very strong anti-transition resistance and load current impact.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System field, specifically relate to a kind of based on the guard method of SV network samples common-tower double-circuit lines single-phase earthing voltage ratio phase.
Background technology
Impedance distance protection is positioned at protection zone according to measurement impedance size faults distance length is still positioned at outside protection zone to distinguish fault point.Impedance distance protection due to by power system operation mode and structural change little, the electric parameters for computation and measurement impedance is total failure component, is applicable to the line protection of the whole failure process of circuit.
Conventional transmission lines road single-phase earthing distance protection hypothesis single phase ground fault is metallic short circuit fault; by the ratio calculation measurement impedance of faulted phase voltage and faulted phase current, and the distance carrying out faults point according to measurement impedance size is to determine whether send action trip signal.In fact, in electric power system, except the metallic earthing short trouble of arteface, the transition resistance of actual transmission line one-phase earth fault point is also non-vanishing, and the additional impedance that transition resistance produces can have a strong impact on the performance of impedance distance protection.If the additional impedance that transition resistance produces is resistance sense, then impedance distance protection tripping when easily causing single phase ground fault in protection zone; If the additional impedance that transition resistance produces be capacitance-resistance, then impedance distance protection generation steady-state when easily causing single phase ground fault outside protection zone.
Operating characteristics round edge circle of existing transmission line single-phase earthing distance protection is through the origin of coordinates; because the origin of coordinates is positioned on operating characteristics round edge circle; during protection forward outlet single-phase grounding fault there is dead band in protection; and along with transition resistance and load current increase, protection forward outlet dead band is larger.Because the origin of coordinates is positioned on operating characteristics round edge circle, there is the possibility of malfunction in protection in the other direction outlet single-phase grounding fault, and transition resistance is larger, protection easier misoperation during protection opposite direction outlet single-phase grounding fault.
Owing to there is very strong zero-sequence mutual inductance between analyses for double circuits on same tower line, based on traditional transformer station of cable secondary circuit, single-phase earthing distance protection cannot obtain the zero-sequence current on another loop line road, the impact of zero-sequence mutual inductance between line cannot be eliminated in algorithm model, by the impact of zero-sequence mutual inductance between line, when traditional single phase ground distance protection is applied to analyses for double circuits on same tower, its protection range will expand greatly, at protection seting scope place usually there is steady-state in fault, make easily misoperation to occur during protection external area error, easily cause the large transfer of trend, cause large area blackout to occur.
Summary of the invention
The object of the invention is to the deficiency overcoming prior art existence; unprotect dead band when a kind of protection forward outlet single back line single phase ground fault is provided; not misoperation during protection opposite direction outlet single back line single phase ground fault; without the need to remembering voltage before line fault; keep loop without the need to arranging voltage before line fault, operating characteristics the whole failure process of double-circuit line generation single back line single phase ground fault be all transient state operating characteristics based on the guard method of SV network samples common-tower double-circuit lines single-phase earthing voltage ratio phase.
The technical solution adopted for the present invention to solve the technical problems is: based on the guard method of SV network samples common-tower double-circuit lines single-phase earthing voltage ratio phase, comprise following sequential steps:
(1) the I loop line road faulted phase voltage of protector measuring common-tower double-circuit lines protection installation place
, I loop line road faulted phase current
with I loop line road zero-sequence current
, measure other two normal phases voltages of I loop line road
; Measure the II loop line road zero-sequence current of common-tower double-circuit lines protection installation place
; Wherein, φ α β=ACB, BAC, CBA phase;
(2) protective device calculates φ phase voltage when I loop line road is normally run
wherein, φ α β=ACB, BAC, CBA phase;
(3) protective device calculates the φ phase voltage at protection seting scope place, I loop line road
wherein, x
setfor I loop line road protection seting scope; z
i1, z
i0be respectively unit length I loop line road positive sequence impedance, zero sequence impedance; z
m0for the zero-sequence mutual inductance impedance between unit length I loop line road and unit length II loop line road;
(4) protective device judges the φ phase voltage at protection seting scope place, I loop line road
φ phase voltage when leading I loop line road is normally run
phase angle
drop in (-90 °, 90 °) scope and whether set up, if set up, then judge φ phase earth fault to occur, the circuit breaker at two ends, protective device tripping I loop line road within the scope of the protection seting of I loop line road.
The invention has the beneficial effects as follows:
First the inventive method measures the common-tower double-circuit lines protection I loop line road faulted phase voltage of installation place, I loop line road faulted phase current and I loop line road zero-sequence current, measure other two normal phases voltages of I loop line road, measure the II loop line road zero-sequence current of common-tower double-circuit lines protection installation place; Faulted phase voltage when utilizing normal phase voltage calculation I loop line road, I loop line road two normally to run; calculate the faulted phase voltage at protection seting scope place, I loop line road; then judge that the phase angle of faulted phase voltage when faulted phase voltage leading I loop line road at protection seting scope place, I loop line road is normally run drops on (-90 °; 90 °) whether set up in scope; if set up; then judge single phase ground fault to occur, the circuit breaker at two ends, protective device tripping I loop line road within the scope of the protection seting of I loop line road.The inventive method obtains another loop line road zero-sequence current based on SV network samples, takes into account the impact of another loop line road zero-sequence current in algorithm model, principle to eliminate between line zero-sequence mutual inductance impedance to the impact of Perfomance of protective relaying.The inventive method operating characteristics circle is through third quadrant; the origin of coordinates is positioned at operating characteristics circle; therefore the inventive method unprotect dead band when protection exit single back line single phase ground fault, not misoperation during protection opposite direction outlet single back line single phase ground fault.The inventive method is without the need to remembering voltage before line fault, and relaying protection hardware keeps loop without the need to arranging voltage before line fault.The inventive method operating characteristics is all transient state operating characteristics in the whole failure process of double-circuit line generation single back line single phase ground fault, has the ability of very strong anti-transition resistance and load current impact.
Accompanying drawing explanation
Fig. 1 is application common-tower double-circuit lines transmission system schematic diagram of the present invention.
Embodiment
According to Figure of description, technical scheme of the present invention is expressed in further detail below.
Fig. 1 is application common-tower double-circuit lines transmission system schematic diagram of the present invention.In Fig. 1, CVT is voltage transformer, CT is current transformer.In intelligent substation; SV network communication networking is carried out to sampled digital signal transmission channel; after the ac analog that merge cells Real-time Collection voltage transformer CVT summation current transformer CT exports; the ac analog that the voltage transformer CVT summation current transformer CT collected exports is changed into sampled digital signal by merge cells; be transferred to interchanger through optical-fibre communications, and then be transferred to the relay protection of transmission line device of application the inventive method through optical-fibre communications.
Protective relaying device measures the I loop line road faulted phase voltage of common-tower double-circuit lines protection installation place
i loop line road faulted phase current
with I loop line road zero-sequence current
measure other two normal phases voltages of I loop line road
based on the II loop line road zero-sequence current measuring common-tower double-circuit lines protection installation place during SV network implementation
; Wherein, φ α β=ACB, BAC, CBA phase, that is, when φ=A phase time, α=C phase, β=B phase; When φ=B phase time, α=A phase, β=C phase; When φ=C phase time, α=B phase, β=A phase.Above-mentioned I loop line road refers to a loop line road of fault in common-tower double-circuit lines, II loop line road to refer in common-tower double-circuit lines normal run another loop line road.
Faulted phase voltage when protective relaying device utilizes normal phase voltage calculation I loop line road, I loop line road two normally to run, namely utilizes I loop line road two normal phase voltage
calculate φ phase voltage when I loop line road is normally run
wherein, φ α β=ACB, BAC, CBA phase, that is, when φ=A phase time, α=C phase, β=B phase; When φ=B phase time, α=A phase, β=C phase; When φ=C phase time, α=B phase, β=A phase.
Protective relaying device calculates the φ phase voltage at protection seting scope place, I loop line road
wherein, x
setfor I loop line road protection seting scope; z
i1, z
i0be respectively unit length I loop line road positive sequence impedance, zero sequence impedance; z
m0for the zero-sequence mutual inductance impedance between unit length I loop line road and unit length II loop line road.
Protective relaying device judges the φ phase voltage at protection seting scope place, I loop line road
φ phase voltage when leading I loop line road is normally run
phase angle
drop in operating characteristics region (-90 °, 90 °) scope and whether set up, if set up, then judge φ phase earth fault to occur, the circuit breaker at two ends, protective relaying device tripping I loop line road within the scope of the protection seting of I loop line road.
The inventive method obtains another loop line road zero-sequence current based on SV network samples, takes into account the impact of another loop line road zero-sequence current in algorithm model, principle to eliminate between line zero-sequence mutual inductance impedance to the impact of Perfomance of protective relaying.
The inventive method operating characteristics circle is through third quadrant; the origin of coordinates is positioned at operating characteristics circle; therefore the inventive method unprotect dead band when protection exit single back line single phase ground fault, not misoperation during protection opposite direction outlet single back line single phase ground fault.
The inventive method is without the need to remembering voltage before line fault, and relaying protection hardware keeps loop without the need to arranging voltage before line fault.
The inventive method operating characteristics is all transient state operating characteristics in the whole failure process of double-circuit line generation single back line single phase ground fault, has the ability of very strong anti-transition resistance and load current impact.
The foregoing is only 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 change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.
Claims (1)
1., based on the guard method of SV network samples common-tower double-circuit lines single-phase earthing voltage ratio phase, it is characterized in that, comprise following sequential steps:
(1) the I loop line road faulted phase voltage of protector measuring common-tower double-circuit lines protection installation place
i loop line road faulted phase current
with I loop line road zero-sequence current
measure other two normal phases voltages of I loop line road
measure the II loop line road zero-sequence current of common-tower double-circuit lines protection installation place
wherein, φ α β=ACB, BAC, CBA phase, that is, when φ=A phase time, α=C phase, β=B phase; When φ=B phase time, α=A phase, β=C phase; When φ=C phase time, α=B phase, β=A phase;
(2) protective device calculates φ phase voltage when I loop line road is normally run
wherein, φ α β=ACB, BAC, CBA phase;
(3) protective device calculates the φ phase voltage at protection seting scope place, I loop line road
wherein, x
setfor I loop line road protection seting scope; z
i1, z
i0be respectively unit length I loop line road positive sequence impedance, zero sequence impedance; z
m0for the zero-sequence mutual inductance impedance between unit length I loop line road and unit length II loop line road;
(4) protective device judges the φ phase voltage at protection seting scope place, I loop line road
φ phase voltage when leading I loop line road is normally run
phase angle
drop in operating characteristics region (-90 °, 90 °) scope and whether set up, if set up, then judge φ phase earth fault to occur, the circuit breaker at two ends, protective device tripping I loop line road within the scope of the protection seting of I loop line road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410053655.5A CN103779847B (en) | 2014-02-18 | 2014-02-18 | Based on the guard method of SV network samples common-tower double-circuit lines single-phase earthing voltage ratio phase |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410053655.5A CN103779847B (en) | 2014-02-18 | 2014-02-18 | Based on the guard method of SV network samples common-tower double-circuit lines single-phase earthing voltage ratio phase |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103779847A CN103779847A (en) | 2014-05-07 |
| CN103779847B true CN103779847B (en) | 2016-04-06 |
Family
ID=50571817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410053655.5A Active CN103779847B (en) | 2014-02-18 | 2014-02-18 | Based on the guard method of SV network samples common-tower double-circuit lines single-phase earthing voltage ratio phase |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103779847B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104052035B (en) * | 2014-07-09 | 2017-02-15 | 国家电网公司 | Same-tower double-circuit line single-phase grounded reactance relay |
| CN104090213A (en) * | 2014-07-25 | 2014-10-08 | 国家电网公司 | Double-circuit-line non-same-name phase overline ground fault positioning method |
| CN104953566A (en) * | 2015-06-17 | 2015-09-30 | 国家电网公司 | Voltage protection method for non-homonymic phase overline grounding fault of double-circuit line with full transient action characteristic |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101593964A (en) * | 2009-06-30 | 2009-12-02 | 许继电气股份有限公司 | The method for longitudinal zero-sequence power direction protection of double-circuit lines on the same pole |
| CN101813736A (en) * | 2009-04-15 | 2010-08-25 | 河南省电力公司 | Distance protection measurement method of double-circuit line on the same pole |
| CN102023275A (en) * | 2010-09-27 | 2011-04-20 | 华北电力大学 | Circuit single-end ranging method based on phase aberration characteristic of positioning function |
-
2014
- 2014-02-18 CN CN201410053655.5A patent/CN103779847B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813736A (en) * | 2009-04-15 | 2010-08-25 | 河南省电力公司 | Distance protection measurement method of double-circuit line on the same pole |
| CN101593964A (en) * | 2009-06-30 | 2009-12-02 | 许继电气股份有限公司 | The method for longitudinal zero-sequence power direction protection of double-circuit lines on the same pole |
| CN102023275A (en) * | 2010-09-27 | 2011-04-20 | 华北电力大学 | Circuit single-end ranging method based on phase aberration characteristic of positioning function |
Non-Patent Citations (2)
| Title |
|---|
| 利用单端电流的同杆双回线准确故障定位研究;所南加乐;《中国电机工程学报》;20051231;第25卷(第23期);第25-30页 * |
| 基于单端单回线电气量的同杆双回线单相接地距离保护;毕天姝;《电力系统自动化》;20130410;第37卷(第7期);第88-93页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103779847A (en) | 2014-05-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103728532A (en) | Power distribution network single-phase grounding fault judging and locating method | |
| CN109861180A (en) | Anti- section switch dead-zone fault bus differential protection is latched prepared auto restart guard method | |
| CN103219711B (en) | A kind of analyses for double circuits on same tower earth fault distance protecting method | |
| CN101800441B (en) | Method for processing boundary information deficiency of centralized protector of digitalized converting station | |
| CN109936121A (en) | 110kV single-trunk segmental wiring bus differential protection is latched prepared auto restart guard method | |
| CN104577999A (en) | Bus protection method and system based on transient-state zero-sequence current characteristic | |
| CN107317308A (en) | The adaptive locking prepared auto restart guard method of sectionalized single busbar connection 110kV bus differential protections | |
| CN102629755B (en) | Power transmission line backup protection method based on wide area information | |
| CN103633630A (en) | Protection method for identifying fault braches based on zero-sequence active ratio | |
| CN103954879A (en) | Method for differentiating fault properties of same-rod double-circuit line with paralleling reactor | |
| CN103779847B (en) | Based on the guard method of SV network samples common-tower double-circuit lines single-phase earthing voltage ratio phase | |
| CN202586308U (en) | Comprehensive grounding protective device for microcomputer | |
| CN109980615A (en) | Eliminate section switch and busbar breaker dead-zone fault relay protecting method | |
| CN103887771A (en) | Method for identifying fault branches on basis of zero and negative sequence integrated current | |
| CN101958579A (en) | Method of treating information loss in centralized protection device of digitalized substation | |
| CN107230970A (en) | A kind of singlephase earth fault processing method of the feeder automation of type on the spot | |
| CN103296658B (en) | Based on the line interphase fault relay protection method of distribution parameter measurement impedance magnitude-phase characteristics | |
| CN105866619B (en) | Based on distribution parameter zero sequence impedance amplitude characteristic circuit high resistant earth-fault detecting method | |
| CN104052033B (en) | A kind of guard method based on zero-sequence current correlation coefficient identification fault branch | |
| CN103779850B (en) | Based on directly adopting straight jumping communication mode double-circuit line single-phase earthing distance protecting method | |
| CN103296646B (en) | Distributed constant is utilized to realize line single-phase earth fault distance protection method | |
| CN109861181A (en) | A kind of relay protecting method for eliminating segmentation and busbar breaker dead-zone fault | |
| CN104078953A (en) | Power transmission line interphase arc light voltage protection method | |
| CN113346462B (en) | Petal type power distribution network contact line protection method based on predicted voltage amplitude | |
| CN104332973A (en) | Line interphase short circuit fault relay protection method through fault active power |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100031 West Chang'an Avenue, Xicheng District, Xicheng District, Beijing Co-patentee after: STATE GRID FUJIAN ELECTRIC POWER Co.,Ltd. Patentee after: STATE GRID CORPORATION OF CHINA Co-patentee after: STATE GRID PUTIAN ELECTRIC POWER SUPPLY Co. Address before: 100031 West Chang'an Avenue, Xicheng District, Xicheng District, Beijing Co-patentee before: STATE GRID FUJIAN ELECTRIC POWER Co.,Ltd. Patentee before: State Grid Corporation of China Co-patentee before: STATE GRID PUTIAN ELECTRIC POWER SUPPLY Co. |
|
| CP01 | Change in the name or title of a patent holder | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20181204 Address after: 351100 No. 999, South Garden Road, Xia Lin Street, Chengxiang District, Putian, Fujian Co-patentee after: STATE GRID FUJIAN ELECTRIC POWER Co.,Ltd. Patentee after: STATE GRID PUTIAN ELECTRIC POWER SUPPLY Co. Co-patentee after: STATE GRID CORPORATION OF CHINA Address before: 100031 West Chang'an Avenue, Xicheng District, Xicheng District, Beijing Co-patentee before: STATE GRID FUJIAN ELECTRIC POWER Co.,Ltd. Patentee before: State Grid Corporation of China Co-patentee before: STATE GRID PUTIAN ELECTRIC POWER SUPPLY Co. |
|
| TR01 | Transfer of patent right |