CN105203903B - Based on dynamic data window electric transmission line phase fault discriminating direction method - Google Patents
Based on dynamic data window electric transmission line phase fault discriminating direction method Download PDFInfo
- Publication number
- CN105203903B CN105203903B CN201510581604.4A CN201510581604A CN105203903B CN 105203903 B CN105203903 B CN 105203903B CN 201510581604 A CN201510581604 A CN 201510581604A CN 105203903 B CN105203903 B CN 105203903B
- Authority
- CN
- China
- Prior art keywords
- transmission line
- failure
- data window
- alternate
- sampled value
- 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
- 230000005540 biological transmission Effects 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005070 sampling Methods 0.000 claims abstract description 33
- 230000005611 electricity Effects 0.000 claims abstract description 18
- 238000009434 installation Methods 0.000 claims abstract description 7
- 230000001681 protective effect Effects 0.000 claims description 23
- 238000004364 calculation method Methods 0.000 abstract description 4
- 230000007704 transition Effects 0.000 abstract description 4
- 230000004888 barrier function Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Abstract
The invention discloses one kind being based on dynamic data window electric transmission line phase fault discriminating direction method.The method of the present invention measures failure voltage between phases sampled value, failure three-phase current sampled value and the alternate negative sequence voltage sampled value of failure of each sampling instant of line protection installation place; calculate dynamic data window length; it is whether true using the alternate electrical quantity sampling value computing electric power line phase fault direction criterion of the failure of a dynamic data window length; if so, then judge that phase fault occurs for transmission line of electricity positive direction.The method of the present invention need to only use electrical quantity sampling value alternate less than the failure of 1/4 cycle data window and participate in operation, and algorithm principle is simple, and program, which is realized, to be easy, and required data window is few, and calculation amount is small, and arithmetic speed is fast.The method of the present invention differentiates that result is not influenced by factors such as power system operation mode, abort situation, transition resistance and load currents, can accurately differentiate the fault direction of electric transmission line phase fault.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System fields, concretely relate to a kind of defeated based on dynamic data window
Electric line phase-to phase fault discriminating direction method.
Background technology
In actual electric network, fault point is likely located at transmission line of electricity negative direction, it is also possible to be located at transmission line of electricity positive direction.If therefore
Barrier point is located at transmission line of electricity negative direction, then protected circuit protective relaying device is failure to actuate, but is protected by the relay of adjacent lines
Protection unit is acted Fault Isolation.If fault point is located at transmission line of electricity positive direction, by the protective relaying device of protected circuit
Failure on protected circuit is isolated for action.Existing transmission line of electricity discriminating direction element mainly has zero sequence power direction first
Part, negative -sequence power direction element and zero-sequence direction component, negative-sequence direction component, zero sequence power direction element, negative -sequence power direction
Electrical quantity used in element and zero-sequence direction component, negative-sequence direction component algorithm is all phasor, needs the data window of a whole wave
Operation is participated in, is related to more complicated Fourier algorithm operation, therefore conventional transmission lines road discriminating direction element real-time is not strong.
If failure is located at protected circuit negative side proximally, phase current power frequency variation, negative-sequence current and zero-sequence current protection criterion
It can act rapidly, conventional transmission lines road discriminating direction element will be unable in time be latched protective relaying device at this time, cause to be protected
It protects circuit relay protection error action of device to make, causes fault coverage to expand, the stabilization of power grids is caused to impact, it is steady to be unfavorable for power grid security
Fixed operation.
Invention content
It is an object of the present invention to overcome the deficiencies of the prior art, and to provide one kind being based on dynamic data window transmission line of electricity
Phase-to phase fault discriminating direction method.The method of the present invention measures the alternate electricity of failure of each sampling instant of line protection installation place
Sampled value, failure three-phase current sampled value and the alternate negative sequence voltage sampled value of failure are pressed, dynamic data window length is calculated, utilizes one
The alternate electrical quantity sampling value computing electric power line phase fault direction criterion of failure of a dynamic data window length whether at
It is vertical, if so, then judge that phase fault occurs for transmission line of electricity positive direction.The method of the present invention need to only be used less than 1/4 period
The alternate electrical quantity sampling value of failure of data window participates in operation, and algorithm principle is simple, and program, which is realized, to be easy, and required data window is few,
Calculation amount is small, and arithmetic speed is fast.The method of the present invention differentiates result not by power system operation mode, abort situation, transition resistance
With the influence of the factors such as load current, the fault direction of electric transmission line phase fault can be accurately differentiated.
To complete above-mentioned purpose, the present invention adopts the following technical scheme that：
Based on dynamic data window electric transmission line phase fault discriminating direction method, which is characterized in that including sequentially walking as follows
Suddenly：
(1) protective device acquires the failure voltage between phases sampling of each sampling instant of line protection installation place in real time
Value, failure three-phase current sampled value and the alternate negative sequence voltage sampled value of failure；
(2) protective device calculates dynamic data window lengthWherein, z1Just for unit length transmission line of electricity
Sequence impedance；Arg(z1) it is unit length electric transmission line positive sequence impedance z1Phase angle；N is per cycle sampling number；
(3) protective device judgesIt is whether true, if so,
Then judge
It is whether true, if so, then protective device judges that phase fault occurs for transmission line of electricity positive direction；
(4) protective device judgesIt is whether true, if so,
Then judge
It is whether true, if so, then protective device judges that phase fault occurs for transmission line of electricity positive direction；
Wherein, uφφ(t)、uφφ(t- Δs t) is respectively the failure voltage between phases sampled value of t, t- Δ t sampling instants；uφφ2
(t-LΔt)、uφφ2(t-L Δ t- Δs t) is respectively that the alternate negative sequence voltage of failure of t-L Δ t, t-L Δ t- Δ t sampling instants is adopted
Sample value；iφφ(t)、iφφ(t-Δt)、iφφ(t-2 Δs t) is respectively the failure three-phase current of t, t- Δ t, t-2 Δ t sampling instants
Sampled value；Δ t is sampling interval duration；l1、r1Respectively unit length electric transmission line positive sequence inductance, positive sequence resistance；φ φ=
AB, BC, CA are alternate；|z1| it is unit length electric transmission line positive sequence impedance z1Amplitude.
The present invention compared with prior art, has following positive achievement：
The method of the present invention measures failure voltage between phases sampled value, the failure of each sampling instant of line protection installation place
Three-phase current sampled value and the alternate negative sequence voltage sampled value of failure calculate dynamic data window length, utilize a dynamic data window
Whether the alternate electrical quantity sampling value computing electric power line phase fault direction criterion of failure of length is true, if so, then
Judge that phase fault occurs for transmission line of electricity positive direction.The method of the present invention need to only use the failure less than 1/4 cycle data window
Alternate electrical quantity sampling value participates in operation, and algorithm principle is simple, and program, which is realized, to be easy, and required data window is few, and calculation amount is small, operation
Speed is fast.The method of the present invention differentiate result not by power system operation mode, abort situation, transition resistance and load current etc. because
The influence of element, can accurately differentiate the fault direction of electric transmission line phase fault.
Description of the drawings
Fig. 1 is the multi-line power transmission system schematic using the present invention.
Specific implementation mode
Technical scheme of the present invention is expressed in further detail below according to Figure of description.
Fig. 1 is the multi-line power transmission system schematic using the present invention.CVT is voltage transformer in Fig. 1, CT is Current Mutual Inductance
Device.Protective device acquires failure voltage between phases sampled value, the failure phase of each sampling instant of line protection installation place in real time
Between current sampling data and the alternate negative sequence voltage sampled value of failure.
Protective device unit of account length electric transmission line positive sequence impedance z1Phase angle Arg (z1)。
Protective device unit of account length electric transmission line positive sequence impedance z1Amplitude | z1|。
Protective device calculates dynamic data window lengthWherein, N is per cycle sampling number.
Protective device judgesIt is whether true, if so, then sentence
It is disconnected
It is whether true, if so, then protective device judges that phase fault occurs for transmission line of electricity positive direction.
Protective device judgesIt is whether true, if so, then sentence
It is disconnected
It is whether true, if so, then protective device judges that phase fault occurs for transmission line of electricity positive direction.
Wherein, uφφ(t)、uφφ(t- Δs t) is respectively the failure voltage between phases sampled value of t, t- Δ t sampling instants；uφφ2
(t-LΔt)、uφφ2(t-L Δ t- Δs t) is respectively that the alternate negative sequence voltage of failure of t-L Δ t, t-L Δ t- Δ t sampling instants is adopted
Sample value；iφφ(t)、iφφ(t-Δt)、iφφ(t-2 Δs t) is respectively the failure three-phase current of t, t- Δ t, t-2 Δ t sampling instants
Sampled value；Δ t is sampling interval duration；l1、r1Respectively unit length electric transmission line positive sequence inductance, positive sequence resistance；φ φ=
AB, BC, CA are alternate.
The method of the present invention measures failure voltage between phases sampled value, the failure of each sampling instant of line protection installation place
Three-phase current sampled value and the alternate negative sequence voltage sampled value of failure calculate dynamic data window length, utilize a dynamic data window
Whether the alternate electrical quantity sampling value computing electric power line phase fault direction criterion of failure of length is true, if so, then
Judge that phase fault occurs for transmission line of electricity positive direction.The method of the present invention need to only use the event less than 1/4 period short-data windows
Hinder alternate electrical quantity sampling value and participate in operation, algorithm principle is simple, realizes and is easy, and required data window is few, and calculation amount is small, operation speed
Degree is fast.The method of the present invention differentiates result not by factors such as power system operation mode, abort situation, transition resistance and load currents
Influence, can accurately differentiate the fault direction of electric transmission line phase fault.
The foregoing is merely the preferred embodiments of the present invention, but scope of protection of the present invention is not limited thereto, appoint
What those familiar with the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in, all
It is covered by the protection scope of the present invention.
Claims (1)
1. being based on dynamic data window electric transmission line phase fault discriminating direction method, step includes：
(1) protective device acquires the failure voltage between phases sampled value of each sampling instant of line protection installation place, event in real time
Hinder three-phase current sampled value and the alternate negative sequence voltage sampled value of failure, which is characterized in that further include following sequential steps：
(2) protective device calculates dynamic data window lengthWherein, z1It is hindered for unit length electric transmission line positive sequence
It is anti-；Arg(z1) it is unit length electric transmission line positive sequence impedance z1Phase angle；N is per cycle sampling number；
(3) protective device judgesIt is whether true, if so, then judgeIt is
No establishment, if so, then protective device judges that phase fault occurs for transmission line of electricity positive direction；
(4) protective device judgesIt is whether true, if so, then judgeIt is
No establishment, if so, then protective device judges that phase fault occurs for transmission line of electricity positive direction；
Wherein, uφφ(t)、uφφ(t- Δs t) is respectively the failure voltage between phases sampled value of t, t- Δ t sampling instants；uφφ2(t-LΔ
t)、uφφ2 (t-L Δ t- Δs t) is respectively the alternate negative sequence voltage sampled value of failure of t-L Δ t, t-L Δ t- Δ t sampling instants；
iφφ(t)、iφφ(t-Δt)、iφφ(t-2 Δs t) is respectively the failure three-phase current sampling of t, t- Δ t, t-2 Δ t sampling instants
Value；Δ t is sampling interval duration；l1、r1Respectively unit length electric transmission line positive sequence inductance, positive sequence resistance；φ φ are represented or AB
Alternate or BC is alternate or CA is alternate；|z1| it is unit length electric transmission line positive sequence impedance z1Amplitude.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510581604.4A CN105203903B (en) | 2015-09-14 | 2015-09-14 | Based on dynamic data window electric transmission line phase fault discriminating direction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510581604.4A CN105203903B (en) | 2015-09-14 | 2015-09-14 | Based on dynamic data window electric transmission line phase fault discriminating direction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105203903A CN105203903A (en) | 2015-12-30 |
| CN105203903B true CN105203903B (en) | 2018-11-06 |
Family
ID=54951685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510581604.4A Active CN105203903B (en) | 2015-09-14 | 2015-09-14 | Based on dynamic data window electric transmission line phase fault discriminating direction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105203903B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111896822B (en) * | 2020-06-22 | 2022-05-20 | 许继集团有限公司 | Alternating current analog quantity direction distinguishing method and device |
| CN111751672A (en) * | 2020-07-08 | 2020-10-09 | 国网福建省电力有限公司检修分公司 | Power transmission line single-phase earth fault direction discrimination method based on dynamic data window |
| CN114563620A (en) * | 2022-02-28 | 2022-05-31 | 周亚萍 | Circuit and method for identifying signal transmission direction of electric circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1652424A (en) * | 2005-01-13 | 2005-08-10 | 天津大学 | Protecting method for short-circuit between wire coils of parallel reactor of ultrahigh voltage transmission line |
| CN103219713A (en) * | 2013-04-15 | 2013-07-24 | 国家电网公司 | Electric transmission line phase fault distance protecting method |
| 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 |
| CN104078952A (en) * | 2014-07-16 | 2014-10-01 | 国家电网公司 | Line interphase fault voltage protection method based on along-line interphase voltage amplitude characteristics |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2560259A1 (en) * | 2011-08-16 | 2013-02-20 | ABB Technology AG | A method of distance protection of parallel transmission line |
-
2015
- 2015-09-14 CN CN201510581604.4A patent/CN105203903B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1652424A (en) * | 2005-01-13 | 2005-08-10 | 天津大学 | Protecting method for short-circuit between wire coils of parallel reactor of ultrahigh voltage transmission line |
| CN103219713A (en) * | 2013-04-15 | 2013-07-24 | 国家电网公司 | Electric transmission line phase fault distance protecting method |
| 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 |
| CN104078952A (en) * | 2014-07-16 | 2014-10-01 | 国家电网公司 | Line interphase fault voltage protection method based on along-line interphase voltage amplitude characteristics |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105203903A (en) | 2015-12-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104795801B (en) | A kind of breaker non-three phase method of discrimination and device based on voltage | |
| CN101806849B (en) | Fault pole selection method using polar wave waveform area specific value of extra-high voltage direct-current transmission | |
| CN104391221B (en) | A kind of fault phase-selecting method of utilization phase current gradient sum | |
| CN103760471A (en) | Electric transmission line single-phase earth fault direction discriminating method based on instantaneous sampled values | |
| CN107394757B (en) | A kind of preceding fault-free recognition methods of power distribution network phase-to phase fault coincidence | |
| CN105203903B (en) | Based on dynamic data window electric transmission line phase fault discriminating direction method | |
| CN105759170B (en) | The transmission lines earth fault phase-selecting method that anti-transition resistance influences | |
| CN103219713A (en) | Electric transmission line phase fault distance protecting method | |
| CN103227455A (en) | Single-phase line earth fault relay protection method based on fault impedance phase characteristic | |
| CN104635111B (en) | A kind of distribution network failure based on fault moment S-transformation spectral characteristic starts method | |
| CN103207353A (en) | Line inter-phase fault distance measuring method based on discrete sampling value | |
| CN103760470A (en) | Electric transmission line inter-phase short circuit fault direction discriminating method based on discrete sampled values | |
| CN104034966A (en) | Online measurement method of MYPTJ mining high voltage cable insulation resistance | |
| CN103760419A (en) | Phase angle measuring method of voltage and current of electric transmission line | |
| CN106340859A (en) | Half-wavelength AC transmission line single-end fast protection method | |
| CN203811747U (en) | A small current grounding line selection system | |
| CN103245823B (en) | Voltage at interphase short circuit fault point of power transmission line measuring method | |
| CN105403779A (en) | Direct current line fault recognition method based on polar line current gradient sum | |
| CN103227456A (en) | Single-phase earth fault distance protection method of power transmission line | |
| CN115267605A (en) | AC-DC hybrid power line fault signal monitoring method and system | |
| CN103336208B (en) | The method of AC/DC Power System self-adaptation 100Hz Protection criteria | |
| CN103149491B (en) | Electric transmission line interphase fault type diagnostic method | |
| CN111751672A (en) | Power transmission line single-phase earth fault direction discrimination method based on dynamic data window | |
| CN103219714A (en) | Line inter-phase fault relay protection method based on voltage drop phase characteristics | |
| CN103163425A (en) | Working criterion method for power frequency variation amplitude comparison line selection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |