CN108828407A - Double circuits on same tower mixed power transmission line fault locating method - Google Patents
Double circuits on same tower mixed power transmission line fault locating method Download PDFInfo
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- CN108828407A CN108828407A CN201810695571.XA CN201810695571A CN108828407A CN 108828407 A CN108828407 A CN 108828407A CN 201810695571 A CN201810695571 A CN 201810695571A CN 108828407 A CN108828407 A CN 108828407A
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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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- 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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- Locating Faults (AREA)
Abstract
The present invention provides a kind of double circuits on same tower mixed power transmission line fault locating method, has been put forward for the first time double back mixed power transmission line fault locating method, gives fault location apart from expression formula.This method only needs to obtain each side current data of double back mixed power transmission line, and the solution of abort situation can be realized using known joint line basic parameter.The Fault Locating Method positioning accuracy is excellent, can overcome the influence of transition resistance and changes of operating modes, the double circuits on same tower mixed power transmission line within Concentrated city hundred kilometers.
Description
Technical field
The present invention relates to power system automation technology field, especially a kind of power transmission line fault locating method.
Background technique
The appearance of fault locator greatly reduces the labor intensity of power-line patrolling staff, and accurately failure is fixed
Position result is conducive to quickly repair route and restore electricity in time.As power grid scale is increasing, transmission line structure is from biography
It unites the more complicated of single change, is mainly reflected in same bar, more times, multiple-limb, blend etc..Line construction changes
Afterwards, biggish position error will necessarily be generated using uniline localization method, conventional method is no longer applicable in.Therefore, it is necessary to grind
Study carefully the Fault Locating Method of complicated line construction.
Summary of the invention
The purpose of the present invention is overcoming the deficiencies in the prior art, a kind of double circuits on same tower mixed power transmission line is provided
Fault Locating Method, positioning principle is simple, can easily provide fault location result expression；The technical side that the present invention uses
Case is：
A kind of double circuits on same tower mixed power transmission line fault locating method, using the positive sequence of double circuits on same tower mixed power transmission line,
Negative phase-sequence or zero sequence equivalent circuit are analyzed, and calculate short trouble by each side current data of double circuits on same tower mixed power transmission line
Point to transmission line of electricity wherein side fault location distance x.
Specifically, double circuits on same tower mixed power transmission line includes I loop line, II loop line；I loop line and II loop line include α, β two
A section；Wherein α section is different with the type of β section transmission line of electricity；
Double circuits on same tower mixed power transmission line is connected between the side plant stand M and the side N, and the tie point of α section and β section is P；α
Section line length is lα, unit length impedance Zα, β section line length is lβ, unit length impedance Zβ, the side M power supply EM, the side N
Power supply EN；
When short trouble occurs for double circuits on same tower mixed power transmission line, abort situation may be on α section or β section；
Using positive sequence Equivalent Circuit；The fault location distance for remembering short circuit trouble point F to the side M is x, as follows in two kinds of situation：
1) when short trouble occurs on α section；
I loop line M side forward-order current is IΙM1, I loop line N side forward-order current is IΙN1, II loop line M side forward-order current is IΙΙM1,
II loop line N side forward-order current is IΙΙN1, M side bus positive sequence voltage UM1, N side bus positive sequence voltage UN1；
In positive sequence equivalent circuit, the pressure drop of the two sides M, N is calculated separately to I, II loop line, then is had：
Collated, solution obtains fault location distance x:
2) when short trouble occurs on β section；
In positive sequence equivalent circuit, the pressure drop of the two sides M, N is calculated separately to I, II loop line, then is had：
Collated, solution obtains fault location distance x:
To sum up, fault location distance x：
Further, α section uses overhead line, and β section uses cable.
The advantage of the invention is that：
1) a kind of outstanding double circuits on same tower mixed power transmission line fault locating method is proposed.
2) joint line model can accurately indicate cable run and overhead transmission line.
3) positioning principle is simple, the difficulty without pseudo- root and complicated equation solution, and gives fault location result expression.
4) localization method is only related with essential parameter of circuit and two sides current data, can be by adjusting in line protective devices
Functional module realize the application of localization method.
5) it can be suitably used for the double back mixed power transmission line within hundred kilometers.
Detailed description of the invention
Fig. 1 is double circuits on same tower mixed power transmission line schematic diagram of the invention.
Fig. 2 is positive sequence equivalent circuit when short trouble occurs for α section of the invention.
Fig. 3 is positive sequence equivalent circuit when short trouble occurs for β section of the invention.
Fig. 4 is positioning flow figure of the invention.
Specific embodiment
Below with reference to specific drawings and examples, the invention will be further described.
Double circuits on same tower mixed power transmission line is as shown in Figure 1, include I loop line, II loop line；I loop line and II loop line include α, β
Two sections；Wherein α section is different with the type of β section transmission line of electricity；For example, α section uses overhead line, β section is using electricity
Cable, cable can usually be embedded to underground, have insulating layer；Otherwise it can also be with；
Double circuits on same tower mixed power transmission line is connected between the side plant stand M and the side N, and the tie point of α section and β section is P；α
Section line length is lα, unit length impedance Zα, β section line length is lβ, unit length impedance Zβ, the side M power supply EM, the side N
Power supply EN；
When short trouble occurs for double circuits on same tower mixed power transmission line, abort situation may be on α section or β section；
During the Equivalent Circuit of common-tower double-circuit lines failure calculates, positive sequence, negative phase-sequence, zero sequence equivalent circuit localization and expression having the same
Formula, using positive sequence Equivalent Circuit；The fault location distance for remembering fault point F to the side M is x, is discussed in two kinds of situation such as
Under：
1) when short trouble occurs on α section；
As shown in Figure 2；I loop line M side forward-order current is IΙM1, I loop line N side forward-order current is IΙN1, II side loop line M positive sequence electricity
Stream is IΙΙM1, II loop line N side forward-order current is IΙΙN1, M side bus positive sequence voltage UM1, N side bus positive sequence voltage UN1；
In positive sequence equivalent circuit, the pressure drop of the two sides M, N is calculated separately to I, II loop line, then is had：
Collated, solution obtains fault location distance x:
2) when short trouble occurs on β section；
As shown in Figure 3；
In positive sequence equivalent circuit, the pressure drop of the two sides M, N is calculated separately to I, II loop line, then is had：
Collated, solution obtains fault location distance x:
To sum up, fault location distance x：
The program flow diagram of the localization method is as shown in figure 4, specific step is as follows：
1, short trouble occurs for double circuits on same tower mixed power transmission line, and finder starts；
2, mixed power transmission line basic parameter l is inputtedα、Zα、lβ、Zβ；
3, electric current I is obtained from the protective device at the corresponding interval of faulty lineΙM、IΙΙM、IΙN、IΙΙN, and calculate it respectively just
Order components IΙM1、IΙΙM1、IΙN1、IΙΙN1；
4, it is calculated according to localization and expression formula (5), acquires the distance x of fault point F to the side M；
5, it exports x and shows；
5, terminate.
So far, double circuits on same tower mixed power transmission line fault location is achieved.
The Fault Locating Method positioning accuracy is excellent, can overcome the influence of transition resistance and changes of operating modes, be suitable for
Double circuits on same tower mixed power transmission line in Concentrated city within hundred kilometers.
It should be noted last that the above specific embodiment is only used to illustrate the technical scheme of the present invention and not to limit it,
Although being described the invention in detail referring to example, those skilled in the art should understand that, it can be to the present invention
Technical solution be modified or replaced equivalently, without departing from the spirit and scope of the technical solution of the present invention, should all cover
In the scope of the claims of the present invention.
Claims (3)
1. a kind of double circuits on same tower mixed power transmission line fault locating method, which is characterized in that
It is analyzed using the positive sequence of double circuits on same tower mixed power transmission line, negative phase-sequence or zero sequence equivalent circuit, it is mixed by double circuits on same tower
Close the fault location distance x that each side current data of transmission line of electricity calculates short circuit trouble point to transmission line of electricity wherein side.
2. double circuits on same tower mixed power transmission line fault locating method as described in claim 1, which is characterized in that
Double circuits on same tower mixed power transmission line includes I loop line, II loop line；I loop line and II loop line include two sections of α, β；Wherein α
Section is different with the type of β section transmission line of electricity；
Double circuits on same tower mixed power transmission line is connected between the side plant stand M and the side N, and the tie point of α section and β section is P；α section
Line length is lα, unit length impedance Zα, β section line length is lβ, unit length impedance Zβ, the side M power supply EM, the side N power supply
EN；
When short trouble occurs for double circuits on same tower mixed power transmission line, abort situation may be on α section or β section；Using
Positive sequence Equivalent Circuit；The fault location distance for remembering short circuit trouble point F to the side M is x, as follows in two kinds of situation：
1) when short trouble occurs on α section；
I loop line M side forward-order current is IΙM1, I loop line N side forward-order current is IΙN1, II loop line M side forward-order current is IΙΙM1, II loop line
The side N forward-order current is IΙΙN1, M side bus positive sequence voltage UM1, N side bus positive sequence voltage UN1；
In positive sequence equivalent circuit, the pressure drop of the two sides M, N is calculated separately to I, II loop line, then is had：
Collated, solution obtains fault location distance x:
2) when short trouble occurs on β section；
In positive sequence equivalent circuit, the pressure drop of the two sides M, N is calculated separately to I, II loop line, then is had：
Collated, solution obtains fault location distance x:
To sum up, fault location distance x：
3. double circuits on same tower mixed power transmission line fault locating method as claimed in claim 2, which is characterized in that
α section uses overhead line, and β section uses cable.
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| CN201810695571.XA CN108828407B (en) | 2018-06-29 | 2018-06-29 | Fault positioning method for double-circuit mixed transmission line on same pole |
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|---|---|---|---|
| CN201810695571.XA CN108828407B (en) | 2018-06-29 | 2018-06-29 | Fault positioning method for double-circuit mixed transmission line on same pole |
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| CN108828407B CN108828407B (en) | 2020-10-23 |
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Citations (5)
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|---|---|---|---|---|
| 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 |
| CN102914726A (en) * | 2012-11-07 | 2013-02-06 | 华北电力大学（保定） | Fault positioning method for common-tower double-circuit line |
| CN107167707A (en) * | 2017-06-08 | 2017-09-15 | 国网江苏省电力公司无锡供电公司 | A kind of double circuit lines distance-finding method and device based on unknown parameters |
| CN107229001A (en) * | 2017-06-05 | 2017-10-03 | 天津大学 | The mixed line fault localization method quickly recognized based on fault zone |
| CN108008251A (en) * | 2017-11-29 | 2018-05-08 | 国网江苏省电力公司无锡供电公司 | The fault distance-finding method of mixed power transmission line unknown parameters |
-
2018
- 2018-06-29 CN CN201810695571.XA patent/CN108828407B/en active Active
Patent Citations (5)
| 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 |
| CN102914726A (en) * | 2012-11-07 | 2013-02-06 | 华北电力大学（保定） | Fault positioning method for common-tower double-circuit line |
| CN107229001A (en) * | 2017-06-05 | 2017-10-03 | 天津大学 | The mixed line fault localization method quickly recognized based on fault zone |
| CN107167707A (en) * | 2017-06-08 | 2017-09-15 | 国网江苏省电力公司无锡供电公司 | A kind of double circuit lines distance-finding method and device based on unknown parameters |
| CN108008251A (en) * | 2017-11-29 | 2018-05-08 | 国网江苏省电力公司无锡供电公司 | The fault distance-finding method of mixed power transmission line unknown parameters |
Non-Patent Citations (1)
| Title |
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| 李澄 等: "不受线路参数变化影响的故障测距原理研究", 《江苏电机工程》 * |
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