CN112557818A - Power distribution network fault positioning precision correction method - Google Patents
Power distribution network fault positioning precision correction method Download PDFInfo
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- CN112557818A CN112557818A CN202011365122.2A CN202011365122A CN112557818A CN 112557818 A CN112557818 A CN 112557818A CN 202011365122 A CN202011365122 A CN 202011365122A CN 112557818 A CN112557818 A CN 112557818A
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- distribution network
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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
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The invention relates to the technical field of power distribution network line fault positioning, in particular to a power distribution network fault positioning precision correction method, which comprises the following steps: s1, dividing the actual power line into three sections, wherein the first section and the third section are overhead lines, and the second section is an underground cable line; s2, preliminarily judging the position of the fault point; and S3, after the initial determination section of the fault point is judged, correcting the fault point according to different conditions. The method for correcting the fault positioning accuracy of the power distribution network corrects errors caused by traditional traveling wave distance measurement, is more favorable for the development requirement of quick power restoration, not only retains the convenience of traveling wave distance measurement, but also increases the accuracy of distance measurement.
Description
Technical Field
The invention relates to the technical field of power distribution network line fault positioning, in particular to a power distribution network fault positioning precision correction method.
Background
The dependence on electric power energy sources is higher and higher no matter in enterprise production or daily life. Once power is cut off, huge loss is caused to the whole society. Therefore, in order to reduce the power failure time and improve the power supply reliability, the power grid company increases the investment in human resources and capital. Among the reasons for the power failure of the power system, the failure of the distribution line accounts for 80% or more. The main reason is that distribution lines have the characteristics of many points, wide range, various equipment types, various load changes, complex distribution network topology and the like compared with transmission lines.
The traditional relay protection and manual line patrol fault diagnosis method is as follows: through artifical line of patrolling, after distribution line relay protection action promptly, lead to joining in marriage net feeder export circuit breaker tripping operation, later inform electric power line patrolling personnel along tripping operation distribution lines go to lean on artifical the attempt to seek trouble position, but such mode not only inefficiency but also some recessive faults are difficult to discover. Chinese patent CN209373028U discloses a traveling wave ranging equipment calibration apparatus and a self-checkable traveling wave ranging system, which improve the working efficiency, but the calculation method is not accurate enough, and no more powerful correction method is adopted to correct the position, which has many disadvantages.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the method for correcting the fault positioning precision of the power distribution network, which can effectively improve the accuracy of positioning the faults of the power distribution network facing the overhead line and underground cable mixed type power distribution network and has high precision.
In order to solve the technical problems, the invention provides the following technical scheme:
a method for correcting the fault positioning accuracy of a power distribution network comprises the following steps:
s1, dividing the actual power line into three sections, wherein the first section and the third section are overhead lines, and the second section is an underground cable line;
s2, preliminarily judging the position of the fault point;
and S3, after the initial determination section of the fault point is judged, correcting the fault point according to different conditions.
Further, the actual power line is defined in a related manner, first, two ends of the line are divided into an a end and a B end, a total length used by the actual power line from the a end to the B end is set to be L, and a transmission speed of the traveling wave in the overhead line is set to be Vj, so that during normal operation, Vj is L/tA-B, where tA-B is a time during which the traveling wave is transmitted from the a point and the traveling wave is received at the B point.
Further, a fault point is set to be F, when a fault occurs, the distance from the fault point F to the end A is a, the distance from the fault point F to the end B is B, traveling waves generated by the fault point F are transmitted to the end A and the end B respectively, the time transmitted to the end A is tA, and the time transmitted to the end B is tB.
Further, in step S1, the transmission times of the three lines are denoted as tI, tII, and tIII, respectively.
Further, in step S2, the magnitude relationship between tA and tI, and the magnitude relationship between tB and tli are determined, so as to preliminarily determine the position of the failure point F.
Further, in step S2, the determination method is: if tA < tI, then failure point F appears in the first segment; if tB < tIII, the fault point F appears in the third section; otherwise, it is determined that the failure point F occurs in the second segment.
Further, in step S3, the position of the failure point F is further corrected, and the distance B from the failure point to the B-end is: and b is L-tB Vj.
Further, in step S3, a sag factor is added for calculation during correction.
Further, the sag proportionality coefficient psi is calculated through the ground clearance of the actual overhead line.
Further, the distance B from the fault point to the B end is as follows: b ═ L-tB × (Vj) × (ψ).
Compared with the prior art, the invention has the following beneficial effects:
the traveling wave ranging method has the advantages that the disadvantages of traveling wave ranging in the power distribution network mixed line are compensated and corrected, the accuracy of positioning the power distribution network line fault facing the overhead line and underground cable mixed type is effectively improved, and the accuracy is high.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram illustrating a calculation of a method for correcting the fault location accuracy of a power distribution network according to the present invention;
fig. 2 is a schematic diagram of calculating sag coefficients of the power distribution network fault positioning accuracy correction method.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention comprises the following steps:
example 1:
a method for correcting the fault positioning accuracy of a power distribution network comprises the following steps:
s1, dividing the actual power line into three sections, wherein the first section and the third section are overhead lines, and the second section is an underground cable line;
s2, preliminarily judging the position of the fault point;
and S3, after the initial determination section of the fault point is judged, correcting the fault point according to different conditions.
As shown in fig. 1, the actual power line is defined by dividing two ends of the line into an a end and a B end, setting the total length of the actual power line from the a end to the B end to be L, and setting the transmission speed of the traveling wave in the overhead line to be Vj, when the overhead line normally operates, Vj is L/tA-B, where tA-B is the time for transmitting the traveling wave from the a point and receiving the traveling wave at the B point.
As shown in fig. 1, a fault point is set to be F, when a fault occurs, the distance from the fault point F to the end a is a, the distance from the fault point F to the end B is B, the traveling wave generated by the fault point F is transmitted to the end a and the end B respectively, the time transmitted to the end a is tA, and the time transmitted to the end B is tB.
As shown in fig. 1, in step S1, the transmission times of the three lines are denoted as tI, tII, and tIII, respectively.
In the present embodiment, in step S2, the magnitude relationship of tA and tI, and tB and tiil is determined, thereby preliminarily determining the position of the failure point F.
In this embodiment, in step S2, the method for determining is: if tA < tI, then failure point F appears in the first segment; if tB < tIII, the fault point F appears in the third section; otherwise, it is determined that the failure point F occurs in the second segment.
In this embodiment, in step S3, the position of the failure point F is further corrected, and the distance B from the failure point to the B end is: and b is L-tB Vj.
In this embodiment, in step S3, the sag factor is added to the correction to calculate the sag factor.
As shown in fig. 2, the sag proportionality coefficient ψ is calculated from the ground clearance of the actual overhead line, and there are:
f＝d1*cosα (1)
g＝d2*cosβ (2)
ψ＝(f+g)/(d1+d2) (3)
and (3) solving simultaneously according to the formulas (1), (2) and (3) to obtain the sag proportionality coefficient psi.
In this embodiment, the distance B from the fault point to the B end is: b ═ L-tB × (Vj) × (ψ).
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A power distribution network fault positioning precision correction method is characterized by comprising the following steps:
s1, dividing the actual power line into three sections, wherein the first section and the third section are overhead lines, and the second section is an underground cable line;
s2, preliminarily judging the position of the fault point;
and S3, after the initial determination section of the fault point is judged, correcting the fault point according to different conditions.
2. The method for correcting the fault location accuracy of the power distribution network according to claim 1, wherein the actual power line is defined in a related manner, the two ends of the line are divided into an end a and an end B, the total length of the actual power line from the end a to the end B is set to L, and the transmission speed of the traveling wave in the overhead line is set to Vj, so that during normal operation, Vj is L/tA-B, where tA-B is the time for transmitting the traveling wave from the point a and receiving the traveling wave at the point B.
3. The method for correcting the positioning accuracy of the faults of the power distribution network according to claim 2, wherein a fault point is set to be F, when a fault occurs, the distance from the fault point F to the end A is a, the distance from the fault point F to the end B is B, traveling waves generated by the fault point F are transmitted to the end A and the end B respectively, the time of transmitting the traveling waves to the end A is tA, and the time of transmitting the traveling waves to the end B is tB.
4. The method for correcting the fault location accuracy of the power distribution network according to claim 3, wherein in step S1, the transmission times of three lines are respectively represented as tI, tII and tIII.
5. The method for correcting the power distribution network fault location accuracy according to claim 4, wherein in step S2, the magnitude relationship between tA and tI, and the magnitude relationship between tB and tIII are determined, so as to preliminarily determine the position of the fault point F.
6. The method for correcting the power distribution network fault location accuracy according to claim 5, wherein in step S2, the method for determining is: if tA < tI, then failure point F appears in the first segment; if tB < tIII, the fault point F appears in the third section; otherwise, it is determined that the failure point F occurs in the second segment.
7. The method for correcting power distribution network fault location accuracy according to claim 6, wherein in step S3, the position of fault point F is further corrected, and the distance B from the fault point to the B end is: and b is L-tB Vj.
8. The method for correcting the power distribution network fault location accuracy according to claim 7, wherein in step S3, a sag factor is added for calculation during correction.
9. The method for correcting the power distribution network fault location accuracy according to claim 8, wherein the sag proportionality coefficient ψ is calculated from the ground clearance of an actual overhead line.
10. The method for correcting the power distribution network fault location accuracy according to claim 9, wherein the distance B from the fault point to the B-end is: b ═ L-tB × (Vj) × (ψ).
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| CN107636921A (en) * | 2015-05-05 | 2018-01-26 | Abb瑞士股份有限公司 | Method and apparatus for detecting failure in mixed configuration transmission line of electricity |
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