CN109375035A - A kind of T link asymmetry ground fault section method of discrimination based on voltage's distribiuting along the line - Google Patents
A kind of T link asymmetry ground fault section method of discrimination based on voltage's distribiuting along the line Download PDFInfo
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- CN109375035A CN109375035A CN201811330104.3A CN201811330104A CN109375035A CN 109375035 A CN109375035 A CN 109375035A CN 201811330104 A CN201811330104 A CN 201811330104A CN 109375035 A CN109375035 A CN 109375035A
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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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
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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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
- G01R31/088—Aspects of digital computing
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- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention relates to a kind of T link asymmetry ground fault section method of discrimination based on voltage's distribiuting along the line, belongs to Relay Protection Technology in Power System field.When ground fault occurs for T link, measure three end residual voltage of T link and zero-sequence current, route T junction voltage is calculated to T contact by three end residual voltage of T link and zero-sequence current respectively, there are differences with the T junction voltage extrapolated side is perfected for the residual voltage of guilty culprit section and the calculated T junction voltage of zero-sequence current, and two are perfected side and calculate that gained T junction voltage value is identical respectively, with section where this Judging fault.For the present invention without detecting to wavefront, the initial phase angle of failure does not influence this method accuracy.
Description
Technical field
The present invention relates to a kind of T link asymmetry ground fault section method of discrimination based on voltage's distribiuting along the line belongs to
In Relay Protection Technology in Power System field.
Background technique
T link is a kind of common line connection of 110kV and following voltage class.This martingale is simple,
Speed of application is fast and can effectively reduce equipment investment and save transmission of electricity corridor land used.But the route generally has transmission of electricity function simultaneously
The high feature of rate, once line failure, it is possible to it causes mostly to have a power failure, and the presence of T contact will lead to track walker's hardly possible
Increase line walking blindness to judge fault section.And the special wiring form of T link causes fault distance-finding method to be difficult directly
Row fault localization is tapped into, impedance method fault localization can fail after T contact, and traveling wave method can be because of T contact bring wave impedance not
Continuously fault point back wave is caused to be difficult to differentiate.If can determine fault section before fault localization occurs, can exclude
The erroneous distance measurement that part impedance method and traveling wave method occur is as a result, the blindness of live track walker can also be reduced.
T link asymmetry ground fault section method of discrimination based on voltage's distribiuting along the line is sharp respectively according to telegraph equation
Calculate route T junction voltage with the surveyed residual voltage in three end of T link and zero-sequence current, the T junction voltage as obtained by calculating it
Between comparison in difference, realize fault section differentiate, without calculating line impedance, caught without to wavefront
It catches, required sample rate is low.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of, and the T link asymmetry based on voltage's distribiuting along the line is grounded event
Barrier section method of discrimination, with section where this Judging fault, the scene at present that overcomes lacks asking for T link fault section differentiation
Topic.
The technical scheme is that a kind of T link asymmetry ground fault section based on voltage's distribiuting along the line is sentenced
Other method measures three end residual voltage of T link and zero-sequence current, is connect respectively by T when ground fault occurs for T link
Three end residual voltage of route and zero-sequence current calculate route T junction voltage, the residual voltage of guilty culprit section and zero to T contact
There are differences with the T junction voltage extrapolated side is perfected for the calculated T junction voltage of sequence electric current, and two are perfected side and calculated respectively
Gained T junction voltage value is identical, with section where this Judging fault.
Specific steps are as follows:
(1) assume that three end of T link is respectively the end M, N-terminal, the end O, when T link breaks down, from three end of T link
Measure residual voltageAnd zero-sequence currentN, O；
(2) pass through T link using telegraph equationThe residual voltage and zero-sequence current at end calculate T junction voltage
In formula,For fromHold the line length of T contact, ZcFor surge impedance of a line, γ is line propagation constant；
(3) ifMeet following condition, then can determine that failure is located atEnd
In formula, μ=M, N, O, η=M, N, O,η ≠ μ,ε is discrimination threshold.
The beneficial effects of the present invention are:
1, for the present invention without detecting to wavefront, the initial phase angle of failure does not influence this method accuracy.
2, the present invention only needs residual voltage and electric current, calculates simple.
Detailed description of the invention
Fig. 1 is circuit model figure of the embodiment of the present invention；
Fig. 2 is the end circuit model figure M of embodiment of the present invention residual voltage figure；
Fig. 3 is the end circuit model figure M of embodiment of the present invention zero-sequence current figure；
Fig. 4 is circuit model figure N-terminal residual voltage figure of the embodiment of the present invention；
Fig. 5 is circuit model figure N-terminal zero-sequence current figure of the embodiment of the present invention；
Fig. 6 is the end circuit model figure O of embodiment of the present invention residual voltage figure；
Fig. 7 is the end circuit model figure O of embodiment of the present invention zero-sequence current figure；
Fig. 8 is flow chart of steps of the present invention.
Specific embodiment
With reference to the accompanying drawings and detailed description, the invention will be further described.
Embodiment 1: as shown in figs. 1-7, a kind of T link asymmetry ground fault section based on voltage's distribiuting along the line is sentenced
Other method measures three end residual voltage of T link and zero-sequence current, is connect respectively by T when ground fault occurs for T link
Three end residual voltage of route and zero-sequence current calculate route T junction voltage, the residual voltage of guilty culprit section and zero to T contact
There are differences with the T junction voltage extrapolated side is perfected for the calculated T junction voltage of sequence electric current, and two are perfected side and calculated respectively
Gained T junction voltage value is identical, with section where this Judging fault.
Specific steps are as follows:
(1) assume that three end of T link is respectively the end M, N-terminal, the end O, when T link breaks down, from three end of T link
Measure residual voltageAnd zero-sequence currentN, O；
(2) pass through T link using telegraph equationThe residual voltage and zero-sequence current at end calculate T junction voltage
In formula,For fromHold the line length of T contact, ZcFor surge impedance of a line, γ is line propagation constant；
(3) ifMeet following condition, then can determine that failure is located atEnd
In formula, μ=M, N, O, η=M, N, O,η ≠ μ,ε is discrimination threshold.
Embodiment 2: as shown in figs. 1-7, when T link occur ground fault when, measure three end residual voltage of T link and
Zero-sequence current calculates the voltage of route T contact by three end residual voltage of route and zero-sequence current respectively, if wherein one end calculates
Gained T junction voltage calculates that gained T junction voltage gap is larger with other both ends, and in addition both ends difference is smaller, then can determine that
The one end for having larger gap with other both ends is guilty culprit section.
Assuming that singlephase earth fault occurs on T link as shown in Figure 1, fault point is away from the end the M end 50km, M away from T contact
130km, N-terminal, away from T contact 20km, extract the three end residual voltage of route after failure occurs and zero sequence electricity away from the T contact end 60km, O
Flow data calculates T junction voltage by three end datas by sequentially calculating separately described in this patent, and acquired results are as shown in the table,
It can be determined that fault zone between the end M and T contact.
| |UMT-UNT| | |UMT-UOT| | |UNT-UOT| |
| 18.3 | 17.7 | 0.1 |
Table 1
In conjunction with attached drawing, the embodiment of the present invention is explained in detail above, but the present invention is not limited to above-mentioned
Embodiment within the knowledge of a person skilled in the art can also be before not departing from present inventive concept
Put that various changes can be made.
Claims (2)
1. a kind of T link asymmetry ground fault section method of discrimination based on voltage's distribiuting along the line, it is characterised in that: work as T
When ground fault occurs for link, three end residual voltage of T link and zero-sequence current are measured, passes through three end zero of T link respectively
To T contact calculating route T junction voltage, the residual voltage and zero-sequence current of guilty culprit section are calculated for sequence voltage and zero-sequence current
T junction voltage out with perfect the T junction voltage extrapolated side there are difference, and two perfect side calculates respectively obtained by T contact
Voltage value is identical, with section where this Judging fault.
2. the T link asymmetry ground fault section method of discrimination according to claim 1 based on voltage's distribiuting along the line,
It is characterized in that specific steps are as follows:
(1) assume that three end of T link is respectively the end M, N-terminal, the end O, when T link breaks down, from T link three-terminal p-n-p-n switch
To residual voltageAnd zero-sequence current
(2) pass through T link using telegraph equationThe residual voltage and zero-sequence current at end calculate T junction voltage
In formula,For fromHold the line length of T contact, ZcFor surge impedance of a line, γ is line propagation constant；
(3) ifMeet following condition, then can determine that failure is located atEnd
In formula, μ=M, N, O, η=M, N, O,η ≠ μ,ε is discrimination threshold.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811330104.3A CN109375035A (en) | 2018-11-09 | 2018-11-09 | A kind of T link asymmetry ground fault section method of discrimination based on voltage's distribiuting along the line |
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| CN201811330104.3A CN109375035A (en) | 2018-11-09 | 2018-11-09 | A kind of T link asymmetry ground fault section method of discrimination based on voltage's distribiuting along the line |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110082647A (en) * | 2019-05-30 | 2019-08-02 | 广州水沐青华科技有限公司 | Circuit fault distance measurement and computer readable storage medium based on phase angle curve along power-frequency voltage |
| CN111665419A (en) * | 2020-07-23 | 2020-09-15 | 云南电网有限责任公司红河供电局 | T-connection line fault single-terminal ranging method and system based on wave head symmetry |
| CN114002544A (en) * | 2021-10-11 | 2022-02-01 | 北京四方继保工程技术有限公司 | Method for positioning and ranging multi-terminal line protection fault |
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| CN110082647A (en) * | 2019-05-30 | 2019-08-02 | 广州水沐青华科技有限公司 | Circuit fault distance measurement and computer readable storage medium based on phase angle curve along power-frequency voltage |
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| CN114002544A (en) * | 2021-10-11 | 2022-02-01 | 北京四方继保工程技术有限公司 | Method for positioning and ranging multi-terminal line protection fault |
| CN114002544B (en) * | 2021-10-11 | 2024-03-08 | 北京四方继保工程技术有限公司 | Multi-terminal line protection fault positioning and ranging method |
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Application publication date: 20190222 |