CN109683062B - Fault indicator-based power distribution network overhead line fault positioning method - Google Patents
Fault indicator-based power distribution network overhead line fault positioning method Download PDFInfo
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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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- 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
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Abstract
A power distribution network overhead line positioning method based on a fault indicator comprises the following steps: (1) modeling a network of overhead primary equipment of a distribution network; (2) the fault indicator is used as secondary equipment and performs associated modeling with the primary equipment; (3) according to a conventional distribution network fault positioning method, when a fault occurs, the fault is positioned between adjacent switches; (4) if a fault indicator is installed between adjacent switches of the line, accurate positioning is carried out based on the fault indicator, and the fault is positioned between adjacent towers where the fault indicator is installed. The power distribution network overhead line accurate method based on the fault indicator solves the problem of how the fault indicator participates in power distribution network topology modeling as secondary equipment, realizes the problem of accurate fault positioning of the power distribution network overhead line based on the fault indicator, and is beneficial to application and popularization of the FA function of a power distribution automation system and improvement of power supply reliability of a power distribution network.
Description
Technical Field
The invention belongs to the technical field of power engineering, and relates to a power distribution network fault accurate positioning method.
Background
After the power distribution network breaks down, if the faults can be diagnosed and accurately positioned in time, the method has very important significance for quickly repairing the faults, shortening the fault processing time and improving the power supply reliability.
The diagnosis and positioning of the fault of the power distribution network can only be positioned before the adjacent switch generally at present. For overhead lines, if the number of segments is small, the distance between adjacent switches will also be relatively long, which virtually prolongs the troubleshooting and repair time.
Aiming at the problem that the segmentation few-fault positioning of the overhead line of the power distribution network is not accurate enough, the fault indicators are arranged on the electric poles in the adjacent switches, and the fault indicator can be used for positioning the electric poles between which the fault occurs, so that the fault is accurately positioned.
The problem to be solved is to realize that the fault indicator participates in the topological connection modeling of the power distribution network, so that the fault is accurately positioned.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: when a power distribution network has a fault, how to realize the accurate fault location of an overhead line through a fault indicator, wherein the fault location is between two adjacent telegraph poles provided with the fault indicators.
In order to achieve the above object, the present invention specifically adopts the following technical solutions.
A power distribution network overhead line fault positioning method based on a fault indicator is characterized by comprising the following steps: the fault indicator is installed on the overhead line of the power distribution network, and the fault indicator-based accurate positioning of the overhead line fault of the power distribution network is realized on the basis that the fault indicator participates in the topology modeling of the power distribution network.
A power distribution network overhead line fault positioning method based on a fault indicator is characterized by comprising the following steps:
(1) modeling a network of overhead primary equipment of a distribution network;
(2) installing at least one fault indicator on a power distribution network switch or a line tower between adjacent switches, wherein the fault indicator monitors the feeder current in real time;
(3) taking the fault indicator as secondary equipment, and performing associated modeling with the primary equipment; setting two attributes of 'main equipment' and 'auxiliary equipment' for each fault indicator to describe the corresponding relation and the installation position of the fault indicator and the primary equipment, wherein the two attributes of the 'main equipment' and the 'auxiliary equipment' of the fault indicator respectively correspond to the two related primary equipment; when the fault indicator is installed on a switch, the attribute value of the 'main equipment' fills in the corresponding switch ID, and the attribute of the 'auxiliary equipment' is null; if the fault indicator is installed on a tower of an adjacent feeder section, the two attributes of 'main equipment' and 'auxiliary equipment' respectively fill the IDs of the two adjacent feeder sections;
(4) when the distribution network has a fault, acquiring real-time currents at each switch and each fault indicator;
(5) and (4) based on the associated modeling in the step (3), carrying out fault search according to the real-time current after the fault occurs, and positioning the fault between adjacent towers with fault indicators or between the tower with the fault indicators and the switch.
The invention further discloses the following preferable technical scheme:
and (2) modeling the network of the distribution network overhead primary equipment in the step (1), and modeling the distribution network overhead line equipment and the network topology based on the standards of IEC61970 and IEC61968 to form the connection relation between the primary equipment.
In the step (5), a fault indicator installed between adjacent switches of the line, and the common connection point of the two feeders determined according to the attributes of the 'main equipment' and 'auxiliary equipment' of the fault indicator determined in the step (3) is the installation position of the fault indicator;
the mounting locations of the fault indicators are used to determine the topological relationship between the fault indicators and adjacent switches.
In the step (5), the judgment is carried out according to the topological relation between the equipment of which the current exceeds the fault fixed value after the fault and the equipment, and the fault is positioned between the adjacent fault indicators or between the fault indicators and the adjacent switches, so that the fault of the overhead line of the power distribution network is accurately positioned.
The invention has the beneficial effects that:
the method solves the problem of how the fault indicator participates in the topological modeling of the power distribution network as secondary equipment, realizes the problem of accurate fault positioning of the overhead power distribution network based on the fault indicator, and is beneficial to the application and popularization of the FA function of the power distribution automation system and the improvement of the power supply reliability of the power distribution network.
Drawings
Fig. 1 is an exemplary diagram of an overhead line wiring diagram of a power distribution network.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the drawings in the specification.
The invention discloses a power distribution network overhead line accurate method based on a fault indicator, which comprises the following steps:
(1) modeling a network of overhead primary equipment of a distribution network;
(2) installing at least one fault indicator on a power distribution network switch or a line tower between adjacent switches, wherein the fault indicator monitors the feeder current in real time;
(3) taking the fault indicator as secondary equipment, and performing associated modeling with the primary equipment; setting two attributes of 'main equipment' and 'auxiliary equipment' for each fault indicator to describe the corresponding relation and the installation position of the fault indicator and the primary equipment, wherein the two attributes of the 'main equipment' and the 'auxiliary equipment' of the fault indicator respectively correspond to the two related primary equipment; when the fault indicator is installed on a switch, the attribute value of the 'main equipment' fills in the corresponding switch ID, and the attribute of the 'auxiliary equipment' is null; if the fault indicator is installed on a tower of an adjacent feeder section, the two attributes of 'main equipment' and 'auxiliary equipment' respectively fill the IDs of the two adjacent feeder sections;
(4) when the distribution network has a fault, acquiring real-time currents at each switch and each fault indicator;
(5) and (4) based on the associated modeling in the step (3), carrying out fault search according to the real-time current after the fault occurs, and positioning the fault between adjacent towers with fault indicators or between the tower with the fault indicators and the switch.
The technical scheme of the invention is further described by taking a power distribution network overhead line wiring diagram shown in the attached figure 1 as an embodiment. The distribution network overhead line wiring diagram shown in fig. 1 is a feeder group consisting of 2 feeders connected together by tie switch SW 3. Wherein, CB1, CB2 are outlet switches of 2 feeder lines, SW1, SW2 are section switches, SW3 is a feeder line interconnection switch (the switch state is a branch position in normal operation), and F1, F2 and F3 are fault indicators installed between adjacent section switches SW1 and SW 2. FD1, FD2, … …, FD7 are 7 feeder segments and also represent the area consisting of adjacent switches, adjacent switches and fault indicators. Assuming a short-circuit fault in region FD4, the over-current signals are monitored by switches CB1 and SW1 and fault indicators F1 and F2 upstream of the fault.
The method for accurately positioning the power distribution network overhead line based on the fault indicator comprises the following specific steps:
(1) modeling a network of the overhead primary equipment of the distribution network: modeling switch devices such as outlet switches CB1 and CB2, section switches SW1 and SW2 and a feeder line tie switch SW3 of the feeder line, modeling 7 feeder line sections such as FD1, FD2, … … and FD7, and establishing a topological connection relation between the switch devices and the feeder line section devices based on a CIM standard of IEC 61970;
the topological connection relationships between the devices are shown in the following table.
(2) Installing at least one fault indicator on a line between switches or adjacent switches of the distribution network, the fault indicator monitoring feeder current in real time;
the fault indicator can detect the current magnitude and direction in real time.
(3) The fault indicator is used as a secondary device, and performs association modeling with the primary device: fault indicator F1 is installed between feeder segments FD2 and FD3, fault indicator F2 is installed between FD3 and FD4, and fault indicator F3 is installed between FD4 and FD 5. The fault indicator F1 has a primary device FD2 and a secondary device FD 3; the fault indicator F2 has a primary device FD3 and a secondary device FD 4; the primary device of the fault indicator F3 is FD4, and the secondary device is FD 5.
(4) When a fault occurs, the fault is located between adjacent switches: after the FD4 has short-circuit fault, switches CB1 and SW1 at the upstream of a fault point monitor overcurrent fault signals, and the fault is positioned to occur between adjacent switches SW1 and SW2 according to a conventional distribution network fault positioning method;
(5) if a fault indicator is installed between adjacent switches of the line, accurate positioning is carried out based on the fault indicator, and the fault is positioned between adjacent towers where the fault indicator is installed. After the short-circuit fault occurs in the FD4, it is located by step (3) that the fault occurs between the switch SW1 and the switch SW 2. Three fault indicators F1, F2 and F3 are installed between the SW1 and the SW2, and the installation of the F1 on the common connecting point CN5 of the FD2 and the FD3 can be determined according to the contents of the attributes of the 'main equipment' and the 'auxiliary equipment' of the fault indicators. It was also determined that F2 was installed on the common connection point CN6 of FD3 and FD4 and that F3 was installed on the common connection point CN6 of FD4 and FD 5. According to the topological connection relation between the feeder line section and the switch and between the feeder line section and the feeder line section, the following results are obtained through topological search: switches SW1 are adjacent to F1, F1 is adjacent to F2, F2 is adjacent to F3, and F3 is adjacent to switch SW 2. After FD4 has a fault, the switches CB1 and SW1 and fault indicators F1 and F2 at the upstream of the fault point can both monitor an overcurrent fault signal, the fault indicator is used as a switch, and the fault can be positioned between the fault indicators F2 and F3 by using the same conventional fault positioning method, so that the accurate fault positioning of the fault is realized.
The above-mentioned embodiment is only for illustrating one specific embodiment of the present invention, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, the specific implementation can be changed and modified within the technical idea and framework of the invention, which belong to the protection scope of the invention.
Claims (5)
1. A power distribution network overhead line fault positioning method based on a fault indicator is characterized by comprising the following steps:
(1) modeling a network of overhead primary equipment of a distribution network;
(2) installing at least one fault indicator on a power distribution network switch or a line tower between adjacent switches, wherein the fault indicator monitors the feeder current in real time;
(3) taking the fault indicator as secondary equipment, and performing associated modeling with the primary equipment; setting two attributes of 'main equipment' and 'auxiliary equipment' for each fault indicator to describe the corresponding relation and the installation position of the fault indicator and the primary equipment, wherein the two attributes of the 'main equipment' and the 'auxiliary equipment' of the fault indicator respectively correspond to the two related primary equipment; when the fault indicator is installed on a switch, the attribute value of the 'main equipment' fills in the corresponding switch ID, and the attribute of the 'auxiliary equipment' is null; if the fault indicator is installed on a tower of an adjacent feeder section, the two attributes of 'main equipment' and 'auxiliary equipment' respectively fill the IDs of the two adjacent feeder sections;
(4) when the distribution network has a fault, acquiring real-time currents at each switch and each fault indicator;
(5) and (4) based on the associated modeling in the step (3), carrying out fault search according to the real-time current after the fault occurs, and positioning the fault between adjacent towers with fault indicators or between the tower with the fault indicators and the switch.
2. The fault indicator-based power distribution network overhead line fault location method of claim 1, wherein:
and (2) modeling the network of the distribution network overhead primary equipment in the step (1), and modeling the distribution network overhead line equipment and the network topology based on the standards of IEC61970 and IEC61968 to form the connection relation between the primary equipment.
3. The fault indicator-based power distribution network overhead line fault location method according to claim 1 or 2, characterized in that:
in step (5), the fault indicator installed between adjacent switches of the line is determined according to the attribute values of the 'primary equipment' and 'secondary equipment' of the fault indicator determined in step (3), namely the common connection point of the two feeders determined by the attributes of the 'primary equipment' and 'secondary equipment' is the installation position of the fault indicator.
4. The fault indicator-based power distribution network overhead line fault location method of claim 3, wherein:
the mounting locations of the fault indicators are used to determine the topological relationship between the fault indicators and adjacent switches.
5. The fault indicator-based power distribution network overhead line fault location method of claim 4, wherein:
in the step (5), the judgment is carried out according to the topological relation between the equipment of which the current exceeds the fault fixed value after the fault and the equipment, and the fault is positioned between the adjacent fault indicators or between the fault indicators and the adjacent switches, so that the fault of the overhead line of the power distribution network is accurately positioned.
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