CN107064749A - A kind of Fault Locating Method of complicated distribution line - Google Patents
A kind of Fault Locating Method of complicated distribution line Download PDFInfo
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- CN107064749A CN107064749A CN201710469887.2A CN201710469887A CN107064749A CN 107064749 A CN107064749 A CN 107064749A CN 201710469887 A CN201710469887 A CN 201710469887A CN 107064749 A CN107064749 A CN 107064749A
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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
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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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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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Locating Faults (AREA)
Abstract
The invention discloses a kind of Fault Locating Method of complicated distribution line, including：Step one, mathematical modeling is carried out to distribution line, sets up T nodes, the virtual T nodes that the actual T nodes and different line parameter circuit values section that the tie point that T nodes include actual branch circuit is set up are set up；Step 2, utilizes each plant stand mode information of database purchase power network, system equivalent impedance and distribution line parameter information；Step 3, according to possible position of the electric circle localization of faults of fault current, systematic parameter and each T nodes on main line；Any determined specifically to be likely to occur on bar branched line by branched line impedance parameter.The present invention, which is realized, only relies on system equivalent impedance, the virtual T nodal analysis methods of circuit just achievable distribution network line fault precise positioning, greatly improve distribution line line walking efficiency, enrich distribution scheduling instruction, shorten the failure line walking time, to improving Reliability of Power Supplying Net Work, distribution potential safety hazard is reduced significant.
Description
Technical field
The present invention relates to the FLT field of distribution line, more particularly to a kind of failure of complicated distribution line are fixed
Position method, is a kind of fast fault locating method for mixing model circuit and the complicated circuit of multidrop line.
Background technology
Power distribution network safe operation and user benefit are closely bound up, and healthy and strong intelligent distribution network is nowadays power network development trend, such as
What ensures power distribution network safe and reliable operation, and reducing power distribution network power off time turns into current electric grid important topic.Distribution network failure stops
Electricity is key factor of the line walking time length as influence power recovery after the main cause of power distribution network power loss, failure, this
System aims at failure and quick and precisely positioned, to ensure that electric power is reliably supplied.
Due to device attribute reason, mid ＆ low-voltage line turns into the main body that area power grid failure occurs, wherein 10kV distribution wires
Road failure proportion is up to more than 90%.Conventional line walking mode is directly assigned scheduling according to faulty line by dispatcher and referred to
Order, line management unit is to carry out all fronts without purpose for whole piece circuit to make an inspection tour, and wastes substantial amounts of manpower and materials.Especially work as
Relatively long distance circuit if being maked an inspection tour since circuit head end, will take considerable time close to during the generation short circuit of end, postpone failure solution
Time certainly, and then the power recovery time is postponed, increase loss electricity reduces power consumer satisfaction.And current, network distribution device
Major part can not provide fault location information, even if can provide, and also only be the rough calculation for main line, and the degree of accuracy is not enough
A large amount of moneys are expended to support the aid decision of scheduling, and fault location hardware unit is largely installed in complicated distribution line
This, the application of this method has stronger realistic meaning.
The content of the invention
The purpose of the present invention be exactly in order to solve the above problems there is provided a kind of Fault Locating Method of complicated distribution line,
The accurate method for providing location information, simple, intuitive, are calculated fast when can be broken down on the complicated distribution line of multiple-limb
It is fast accurate, it is practical.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of Fault Locating Method of complicated distribution line, comprises the following steps：
Step one, mathematical modeling is carried out to distribution line, sets up T nodes, T nodes include the tie point of actual branch circuit
The virtual T nodes that the actual T nodes set up and different line parameter circuit values section are set up；
Step 2, is believed using each plant stand mode information of database purchase power network, system equivalent impedance and distribution line parameter
Breath；
Step 3, according to the electric circle localization of faults of fault current, systematic parameter and each T nodes on main line
Possible position；Any determined specifically to be likely to occur on bar branched line by branched line impedance parameter.
System side equivalence plant stand parameter includes three kinds of normal operating mode, maximum operational mode and minimum operational mode, just
Based on the normal method of operation, supplemented by maximum operational mode and minimum operational mode.
In the step 3, before the trouble point determined is calculated and closest T nodes are failure boundary T nodes,
Branched line on main line before failure boundary T nodes is the branch line set that possible break down.
When having two branched lines before failure boundary T nodes, if two branched line impedance parameters are equal, and positioning meter
When the geographical length of the circuit that calculates is less than branch's line length, then its fault location point is：Abort situation is the failure calculated
One in the abort situation that point position and two branched lines are calculated, and position location in two branch lines is from failure side
The distance of boundary's T nodes is equal.
When having two branched lines before failure boundary T nodes, if the unit impedance parameter of branch line 1 is less than branch line 2, and
The geographical length of circuit that both location Calculations go out is respectively less than respective line length, then its fault location point is：In branch line 1
Position location is from the position location for being more than branch line 2 with a distance from failure boundary T nodes, and abort situation is the trouble point position calculated
Put one in the abort situation calculated with two branched lines.
When having two branched lines before virtual T nodes, if the unit impedance parameter of branch line 1 is more than branch line 2, and branch
The geographical length of circuit that the location Calculation of line 1 goes out is less than its line length, and the geographical length of the circuit that the location Calculation of branch line 2 goes out is more than
During its line length, its fault location point is：The collection for the abort situation that the position of failure point calculated is calculated with branch line 1
Close, abort situation is one of the two positions.
Beneficial effects of the present invention：
The present invention, which is realized, only relies on system equivalent impedance, the virtual T nodal analysis methods of circuit just achievable distribution network line
Failure precise positioning, greatly improves distribution line line walking efficiency, distribution scheduling instruction is enriched, when shortening failure line walking
Between, to improving Reliability of Power Supplying Net Work, reduce distribution potential safety hazard significant.
Brief description of the drawings
Fig. 1 is the virtual T nodes schematic diagram of new distribution line fault localization method.
Fig. 2 is new distribution line fault localization method fault location principle schematic.
In figure：1st, the equivalent plant stand of system side；2nd, T nodes；3rd, distribution main line；4th, the equivalent plant stand of load side；5th, branch line；
6th, the electric center of circle；7th, branched line position of failure point；8th, main line position of failure point.
Embodiment
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
A kind of Fault Locating Method of complicated distribution line, with reference to shown in Fig. 1-Fig. 2, comprises the following steps：
Step one, mathematical modeling is carried out to distribution line, mathematical modeling is carried out to distribution line, T nodes, T nodes is set up
The virtual T nodes that the actual T nodes and different line parameter circuit values section that tie point including actual branch circuit is set up are set up；Such as Fig. 1
Shown, system side equivalence plant stand 1 is connected with the equivalent plant stand 4 of load side by distribution main line 3, and distribution main line 3 is provided with 3
Branch line 5 (branch line 1, branch line 2, branch line 3) and 3 T nodes 2 (T1, T2, T3)；
Step 2, is believed using each plant stand mode information of database purchase power network, system equivalent impedance and distribution line parameter
Breath；
Step 3, using T nodes as fault location border, each T node is represented using transformer station as the electric center of circle 6, is become
Power station, can according to the electric circle of fault current, systematic parameter and each T nodes to the electric circle that T nodes electrical distance is radius
Trouble point position on main line, i.e. abort situation is calculated necessarily to occur after which T node, the localization of faults with it is virtual
After the position relationship of T nodes, all branched lines before this T node are trouble point set of fingers that may be present, and are had
Which bar branched line body is likely to occur on, on which position of this branched line, is determined by branched line impedance parameter,
The possibility set of position occurs using this position relationship failure judgement.
System side equivalence plant stand parameter includes three kinds of normal operating mode, maximum operational mode and minimum operational mode, just
Based on the normal method of operation, supplemented by maximum operational mode and minimum operational mode.
In the step 3, before the trouble point determined is calculated and the nearest virtual T nodes of positional distance are failure side
Branched line before boundary's T nodes, failure boundary T nodes is possibly realized the branch line set broken down, according to branched line
Impedance parameter determines the possibility of fault location.
When having two branched lines before failure boundary T nodes, if two branched line impedance parameters are equal, and positioning meter
When the geographical length (non-electrical distance) of the circuit that calculates is less than branch's line length, then its fault location point is：The master calculated
The set for the abort situation that line position of failure point and two branched lines are calculated, and position location in two branch lines is from T
The distance of node is equal.I.e. abort situation may be one of three positions.
When having two branched lines before virtual T nodes, if the unit impedance parameter of branch line 1 is less than branch line 2, and both
The geographical length of circuit that location Calculation goes out is respectively less than respective line length, then its fault location point is：The main line event calculated
The set for the abort situation that barrier point position and two branched lines are calculated, and position location in branch line 1 from T nodes away from
May be one of three positions from the position location more than branch line 2, i.e. abort situation.
When having two branched lines before virtual T nodes, if the unit impedance parameter of branch line 1 is more than branch line 2, and branch
The geographical length of circuit that the location Calculation of line 1 goes out is less than its line length, and the geographical length of the circuit that the location Calculation of branch line 2 goes out is more than
During its line length, its fault location point is：The abort situation that the main line position of failure point calculated is calculated with branch line 1
Set, i.e. abort situation may be one of the two positions.
The accurate model of distribution line that reference picture 1 is set up based on T nodes, all parameters related to positioning of circuit
All accurately it is added among model.T nodes in addition to the actual T nodes that branched line is implicitly present in reality, in addition to
The virtual T nodes set up in the separation of different line type number sections, expand T node extensions.The system side equivalence parameter of plant stand 1 is examined
Consider three kinds of normal operating mode, maximum operational mode and minimum operational mode, normal to run based on hairdo, minimax mode is
It is auxiliary.
This method positioning principle is as shown in Figure 2.This distance-finding method positioning key point is to calculate trouble point and each virtual T nodes
Relative position relation, this relation will define may generation branched line scope.If as illustrated, main line trouble point position
8 generations are put after the virtual T nodes T2 of main line, the branch line 1 before this T node is possibly realized generation with branch line 2
The branched line position of failure point 7 of failure is gathered, according to each parameter situation of branch line, it may occur however that a variety of positioning may.
If two branch line parameter is equal, and position length is less than branch's line length, then its fault location point is K1-
Shown in 1 and K2-1；
If the unit impedance parameter of branch line 1 is less than branch line 2, and both position lengths are respectively less than respective line length, that
Its fault location point is shown in K1-2 and K2-2；
If the unit impedance parameter of branch line 1 is more than branch line 2, and the position length of branch line 1 is less than its line length, branch
When the position length of line 2 is more than its line length, its fault location point is that K2-3 is not actually existed shown in K1-3 and K2-3.Its
Remaining possible positioning scenarios essence herewith three class, can the rest may be inferred.
Fault location under normal operating mode is main body positioning result, is accurate to main line and each possible branch all the way
Certain point, main as accident line walking instructs result.This method considers system and line parameter circuit value error, and positioning result is taken
Rational redundancy processing, it is ensured that positioning result is more effective.
Fault location result is used as aid decision under maximum, minimum operational mode, it is contemplated that system is can energy limit mode
Under fault coverage, a point mode considers accident border T nodes, adapts to all kinds of fault state, in the current side of operation of uncertain system
It can also provide and be accurately positioned in the case of formula, but fault location scope is larger, but for relative whole piece circuit, can still carry significantly
High faulty line line walking efficiency.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, not to present invention protection model
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need to pay various modifications or deform still within protection scope of the present invention that creative work can make.
Claims (6)
1. a kind of Fault Locating Method of complicated distribution line, it is characterized in that, comprise the following steps：
Step one, mathematical modeling is carried out to distribution line, sets up T nodes, the tie point that T nodes include actual branch circuit is set up
Actual T nodes and different line parameter circuit values section set up virtual T nodes；
Step 2, utilizes each plant stand mode information of database purchase power network, system equivalent impedance and distribution line parameter information；
Step 3, according to possibility of the electric circle localization of faults of fault current, systematic parameter and each T nodes on main line
Position；Any determined specifically to be likely to occur on bar branched line by branched line impedance parameter.
2. a kind of Fault Locating Method of complicated distribution line as claimed in claim 1, it is characterized in that, system side equivalence plant stand ginseng
Number includes three kinds of normal operating mode, maximum operational mode and minimum operational mode, based on normal operating mode, maximum operation side
Supplemented by formula and minimum operational mode.
3. a kind of Fault Locating Method of complicated distribution line as claimed in claim 1, it is characterized in that, in the step 3,
Before calculating the trouble point determined and closest T nodes be on failure boundary T nodes, main line failure boundary T nodes it
Preceding branched line is the branch line set that possible break down.
4. a kind of Fault Locating Method of complicated distribution line as claimed in claim 3, it is characterized in that, failure boundary T nodes it
Before when having two branched lines, if two branched line impedance parameters are equal, and the geographical length of circuit that location Calculation goes out is less than
During branch's line length, then its fault location point is：Abort situation is the position of failure point and two branched line meters calculated
Position location in one in the abort situation calculated, and two branch lines is equal from a distance from failure boundary T nodes.
5. a kind of Fault Locating Method of complicated distribution line as claimed in claim 3, it is characterized in that, failure boundary T nodes it
Before when having two branched lines, if the unit impedance parameter of branch line 1 is less than branch line 2, and both location Calculations circuit for going out
Reason length is respectively less than respective line length, then its fault location point is：Saved from failure boundary T position location in branch line 1
The distance of point is more than the position location of branch line 2, and abort situation is that the position of failure point and two branched lines calculated is calculated
One in the abort situation gone out.
6. a kind of Fault Locating Method of complicated distribution line as claimed in claim 3, it is characterized in that, have before virtual T nodes
During two branched lines, if the unit impedance parameter of branch line 1 is more than branch line 2, and the circuit that the location Calculation of branch line 1 goes out is geographical
Length is less than its line length, when the geographical length of the circuit that the location Calculation of branch line 2 goes out is more than its line length, its fault location
Put and be：The set for the abort situation that the position of failure point that calculates is calculated with branch line 1, abort situation be the two positions it
One.
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| CN201710469887.2A CN107064749A (en) | 2017-06-20 | 2017-06-20 | A kind of Fault Locating Method of complicated distribution line |
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| CN201710469887.2A CN107064749A (en) | 2017-06-20 | 2017-06-20 | A kind of Fault Locating Method of complicated distribution line |
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Cited By (6)
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| CN109655718A (en) * | 2019-02-25 | 2019-04-19 | 广东工业大学 | A kind of electrical power distribution network fault location method |
| CN110244182A (en) * | 2019-06-28 | 2019-09-17 | 国电南瑞南京控制系统有限公司 | A kind of Fault Locating Method and system suitable for electric railway multipoint line |
| CN110726904A (en) * | 2019-09-27 | 2020-01-24 | 广西电网有限责任公司电力科学研究院 | Method for accurately positioning fault point based on distributed T-order power transmission circuit |
| CN110850228A (en) * | 2019-11-04 | 2020-02-28 | 国网江苏省电力有限公司泰州供电分公司 | Low-voltage transformer area fault positioning method based on equivalent impedance characteristics of phase change switch |
| CN111157839A (en) * | 2019-12-10 | 2020-05-15 | 重庆邮电大学 | Low-voltage power grid fault positioning method based on chaotic signals |
| CN114660414A (en) * | 2022-03-31 | 2022-06-24 | 云南电网有限责任公司电力科学研究院 | Multi-port medium-voltage distribution network fault positioning method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109655718A (en) * | 2019-02-25 | 2019-04-19 | 广东工业大学 | A kind of electrical power distribution network fault location method |
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| CN110850228A (en) * | 2019-11-04 | 2020-02-28 | 国网江苏省电力有限公司泰州供电分公司 | Low-voltage transformer area fault positioning method based on equivalent impedance characteristics of phase change switch |
| CN111157839A (en) * | 2019-12-10 | 2020-05-15 | 重庆邮电大学 | Low-voltage power grid fault positioning method based on chaotic signals |
| CN114660414A (en) * | 2022-03-31 | 2022-06-24 | 云南电网有限责任公司电力科学研究院 | Multi-port medium-voltage distribution network fault positioning method and device |
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