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
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Abstract
本发明公开了一种基于动态数据窗输电线路相间故障方向判别方法。本发明方法测量输电线路保护安装处的各采样时刻的故障相间电压采样值、故障相间电流采样值和故障相间负序电压采样值，计算动态数据窗长度，利用一个动态数据窗长度的故障相间电气量采样值计算输电线路相间短路故障方向判据是否成立，若成立，则判断输电线路正方向发生相间短路故障。本发明方法只需用到小于1/4周期数据窗的故障相间电气量采样值参与运算，算法原理简单，程序实现容易，所需数据窗少，计算量小，运算速度快。本发明方法判别结果不受电力系统运行方式、故障位置、过渡电阻和负荷电流等因素的影响，能准确判别输电线路相间短路故障的故障方向。
The invention discloses a method for discriminating the fault direction between phases of a transmission line based on a dynamic data window. The method of the invention measures the sampled value of the fault phase voltage, the fault phase current and the fault phase negative sequence voltage sampling value at each sampling time at the installation place of the transmission line protection, calculates the length of the dynamic data window, and utilizes a fault phase electrical fault with a dynamic data window length Calculate the phase-to-phase short-circuit fault direction criterion of the transmission line based on the sampled values of the transmission line. The method of the invention only needs to use the sampling value of the faulty phase-to-phase electric quantity less than 1/4 cycle data window to participate in the calculation, the algorithm principle is simple, the program is easy to realize, the required data window is small, the calculation amount is small, and the calculation speed is fast. The identification result of the method of the invention is not affected by factors such as power system operation mode, fault location, transition resistance and load current, and can accurately determine the fault direction of the phase-to-phase short-circuit fault of the transmission line.
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.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 | A method for determining the direction of a single-phase-to-ground fault in a transmission line based on a 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 |
| CN117907750A (en) * | 2024-02-08 | 2024-04-19 | 云南电网有限责任公司电力科学研究院 | Distribution network fault positioning method, device, equipment and medium based on distribution transformer terminal |
| CN119482931A (en) * | 2024-11-04 | 2025-02-18 | 国网山东省电力公司威海供电公司 | Low voltage area topology identification method based on adaptive sliding window |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1652424A (en) * | 2005-01-13 | 2005-08-10 | 天津大学 | Inter-turn short-circuit protection method for shunt reactor of ultra-high 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 |
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| 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 |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1652424A (en) * | 2005-01-13 | 2005-08-10 | 天津大学 | Inter-turn short-circuit protection method for shunt reactor of ultra-high 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 |
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