CN111679157A - Method for positioning single-phase disconnection and load side grounding fault section of neutral point ungrounded system - Google Patents

Method for positioning single-phase disconnection and load side grounding fault section of neutral point ungrounded system Download PDF

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Publication number
CN111679157A
CN111679157A CN202010759800.7A CN202010759800A CN111679157A CN 111679157 A CN111679157 A CN 111679157A CN 202010759800 A CN202010759800 A CN 202010759800A CN 111679157 A CN111679157 A CN 111679157A
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criterion
line
detection point
phase
side grounding
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董立明
于恒友
王干军
张宗熙
李简
谢东霖
于乔
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Guangdong Power Grid Co Ltd
Zhongshan Power Supply Bureau of Guangdong Power Grid Co Ltd
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Guangdong Power Grid Co Ltd
Zhongshan Power Supply Bureau of Guangdong Power Grid Co Ltd
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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
    • 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
    • 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
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • 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
    • G01R31/54—Testing for continuity
    • 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
    • G01R31/58—Testing of lines, cables or conductors

Abstract

The invention discloses a method for positioning a single-phase line break and load side grounding fault section of a neutral point ungrounded system, which comprises the following steps of: s1: acquiring voltage amplitude and phase information of each detection point of the power line, defining line voltage of each detection point, and defining comparison voltage; s2: respectively setting a first criterion, a second criterion and a third criterion; and S3, sequentially judging whether the line voltage at each detection point meets one of a first criterion, a second criterion and a third criterion from the bus outlet to the line tail end, if any criterion is met, determining that the single-phase disconnection and load side grounding fault occurs, and determining that the fault section is positioned between the detection point which meets the criterion for the first time and the last detection point, and if the detection points from the first section of the line to the line tail end do not meet the three criteria, determining that the line has no single-phase disconnection and load side grounding fault. The invention does not need to additionally add a detection instrument, has wider application range and stronger practicability.

Description

Method for positioning single-phase disconnection and load side grounding fault section of neutral point ungrounded system
Technical Field
The invention relates to the technical field of relay protection of a power distribution network, in particular to a method for positioning a single-phase disconnection and load side grounding fault section of a neutral point ungrounded system.
Background
In recent years, a disconnection fault has become a more common fault. After the insulated conductor is flashover due to lightning stroke and the like, electric arcs cannot freely move under the action of electrodynamic force and wind like on a bare conductor, and continuous arcing easily fuses arc points to cause disconnection. When the broken string droops to near ground, perhaps falls ground when forming high resistance earth fault because the effect of earth impedance and insulating crust, very easily causes people and animals around to electrocute and causes the incident, consequently, realizes the quick location of single-phase broken string trouble section, to improving the utilization ratio of joining in marriage the current distribution automation equipment of net, solves the broken string and falls to ground fault detection difficult problem, reduces the person and electrocutes the risk and has the significance.
The single-phase line break fault is divided into three types of fracture suspension, power supply side (before fracture) grounding and load side (after fracture) grounding. The existing single-phase broken line ungrounded fault section positioning method is mostly aimed at the type that a fracture is suspended, and the method for broken line and grounded faults is less: the single-phase line break fault area judgment method based on the load monitor has the advantages that a large amount of equipment is not installed in most domestic areas at present; the method for diagnosing the broken line fault by utilizing an intelligent algorithm and integrating various electric quantities such as voltage, current and the like is provided, but the practicability is yet to be further improved; and because the fault point grounding resistance is large and the fault current is weak, the applicability of the existing low-current grounding fault detection method needs to be further determined. Therefore, the diagnosis and positioning method for the single-phase disconnection fault on the load side provided by the patent utilizes a large number of on-site installed distribution network automation devices, does not need to add new instruments, can be realized only by utilizing voltage information, and well makes up the limitation of the existing method.
Disclosure of Invention
The invention provides a single-phase line break and load side grounding fault section positioning method for a neutral point ungrounded system, aiming at overcoming the defects of poor practicability and applicability of the single-phase line break fault area judgment method in the prior art.
The primary objective of the present invention is to solve the above technical problems, and the technical solution of the present invention is as follows:
a single-phase disconnection and load side grounding fault section positioning method of a neutral point ungrounded system comprises the following steps:
s1: acquiring voltage amplitude and phase information of each detection point of the power line, and defining line voltage of each detection point as follows:
Figure BDA0002612752450000021
defining the comparison voltage U at the same time1、U2、U3；
S2: respectively setting a first criterion, a second criterion and a third criterion;
and S3, sequentially judging whether the line voltage at each detection point meets one of a first criterion, a second criterion and a third criterion from the bus outlet to the line tail end, if any criterion is met, determining that the single-phase disconnection and load side grounding fault occurs, and determining that the fault section is positioned between the detection point which meets the criterion for the first time and the last detection point, and if the detection points from the first section of the line to the line tail end do not meet the three criteria, determining that the line has no single-phase disconnection and load side grounding fault.
In the present invention, the expression of the comparison voltage is as follows:
Figure BDA0002612752450000022
in the present invention, the first criterion is:
Figure BDA0002612752450000023
and theta1-θ2∈[0°～60°)。
In the present invention, the second criterion is:
Figure BDA0002612752450000024
and theta2-θ3∈[0°～60°)。
In the present invention, the third criterion is:
Figure BDA0002612752450000025
and theta3-θ1∈[0°～60°)。
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
according to the invention, the line voltage amplitude and the phase information of the detection point are obtained, the occurrence of the single-phase line break and load side earth fault is judged according to the preset criterion, and the fault section is determined.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Fig. 2 is a schematic diagram of a fault section location according to an embodiment of the present invention.
Fig. 3 is a diagram of a fault line and distribution points of a single-phase disconnection and load-side grounding of a system with a neutral point not grounded according to an embodiment of the present invention.
FIG. 4 shows Q in the detection system according to the embodiment of the present invention3And simulating a waveform diagram of the line voltage at the detection point.
FIG. 5 shows a diagram of Q in the system of the detection system according to the embodiment of the invention4Line voltage simulation wave at detection pointAnd (6) forming a graph.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Example 1
Fig. 1 to 5 are drawings of examples of the present invention, and the present invention will be further described with reference to fig. 1 to 5:
as shown in fig. 3, the detection system suitable for the present invention includes three parts: the system comprises detection equipment (assuming that detection devices are all FTUs) distributed at each detection point, a master station and a communication system for contacting the detection equipment and the master station. L is1、L2、L 33 outgoing lines of the bus, wherein the line lengths are respectively L1＝11km、L2＝9km、L3＝20km，L3The line fails. Q1、Q2、Q3、Q4For section switch, the section switch is respectively positioned at 0.5km,7km,14km and 20km from the bus of the fault line, and the section switch is positioned at the switch Q on the assumption that the A phase of the system is disconnected and F is set as a disconnection point3、Q4At fault line 3/4, i.e. 15km from the busbar. Setting relevant positive sequence parameters of the overhead line of the system as follows: z1＝(0.17+j0.38)Ω/km，b1J3.045) us/km. Zero sequence parameter is Z0＝(0.23+j1.72)Ω/km，b0J1.884 us/km. The loads are connected in a triangular mode, and the equivalent load impedance of each line is set to be ZBA＝500Ω；ZAC＝25000Ω；ZBCThe system is used for verifying the effectiveness of the method of the invention under the condition that one-phase load is lost is simulated as 500 omega.
The process of the embodiment of the invention is described with reference to the attached drawings 1-2, and specifically as follows:
step 1, acquiring voltage amplitude and phase information of each detection point of a power line, recording the detection point at a bus outlet as a detection point 1, recording adjacent detection points as detection points 2, sequentially adding the numbers of the detection points, recording a line tail end detection point as n, and in the example, the n is equal to 4;
step 2, using k to represent the position of the detection point, and defining each line voltage at the detection point k as
Figure BDA0002612752450000031
Figure BDA0002612752450000032
And defining a comparison voltage
Figure BDA0002612752450000033
Figure BDA0002612752450000034
The initialization k is 1, i.e. located at detection point 1, in the example at Q1At least one of (1) and (b);
step 3, the main station of the detection system collects the line voltage amplitude phase data at the detection point where k is 1, and if one of the three criteria is met, namely
The first criterion is as follows:
Figure BDA0002612752450000041
and theta1-θ2∈[0°～60°)，
The second criterion:
Figure BDA0002612752450000042
and theta2-θ3∈[0°～60°)，
The third criterion is as follows:
Figure BDA0002612752450000043
and theta3-θ1∈ [ 0-60 deg.), the fault section is considered as detection point 1, i.e. Q in the example1Previously, in the example Q1Under the condition of not meeting, so as to executeStep 4 is executed;
step 4, let k be k +1, that is, after the master station of the detection system has judged the situation of the detection point k-1, judge the situation of the downstream detection point, measure the voltage amplitude phase at the detection point k and calculate, in the specific embodiment, k is 2, and when 3, it does not meet the criterion in step 3, and at this time k is 2, and the criterion in step 3 is not met<4, automatically adding 1 to the k value, wherein k is 4, and performing Q3And Q4Section judgment: as shown in the simulation wave diagrams of the system of FIG. 4 and FIG. 5, the sampled value Q is obtained3To
Figure BDA0002612752450000044
Q4To
Figure BDA0002612752450000045
Calculated Q4Meets the third criterion ③
Figure BDA0002612752450000046
And theta3-θ1∈ [0 DEG-60 DEG ] and Q3Is not satisfied, thereby determining that a fault has occurred and the fault section is at Q3And Q4To (c) to (d);
and 5, if the condition that k is not more than or equal to n is not met, determining that no single-phase line break exists from the first section of the line to the tail end of the line and a load side earth fault occurs.
The main station of the detection system can report disconnection information in various forms, such as short message notification, isolate the fault section pair and maintain the fault section pair.
When the fault is in other sectors, the fault is in Q3、Q4The description is omitted.
The method is used for determining the single-phase disconnection and load side grounding fault and positioning the fault section by using the amplitude and phase characteristics of the line voltage at the downstream of the disconnection after the single-phase disconnection and load side grounding fault occurs.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (5)

1. A method for positioning a single-phase disconnection and load side grounding fault section of a neutral point ungrounded system is characterized by comprising the following steps of:
s1: acquiring voltage amplitude and phase information of each detection point of the power line, and defining line voltage of each detection point as follows:
Figure FDA0002612752440000011
defining the comparison voltage U at the same time1、U2、U3；
S2: respectively setting a first criterion, a second criterion and a third criterion;
and S3, sequentially judging whether the line voltage at each detection point meets one of a first criterion, a second criterion and a third criterion from the bus outlet to the line tail end, if any criterion is met, determining that the single-phase disconnection and load side grounding fault occurs, and determining that the fault section is positioned between the detection point which meets the criterion for the first time and the last detection point, and if the detection points from the first section of the line to the line tail end do not meet the three criteria, determining that the line has no single-phase disconnection and load side grounding fault.
2. The method for locating the single-phase disconnection and load-side grounding fault section of the non-grounding-point neutral system according to claim 1, wherein the expression of the comparison voltage is as follows:
Figure FDA0002612752440000012
3. the method for locating the single-phase disconnection and load-side grounding fault section of the non-grounding neutral point system according to claim 2, wherein the first criterion is as follows:
Figure FDA0002612752440000013
and theta1-θ2∈[0°～60°)。
4. The method for locating the single-phase disconnection and load-side grounding fault section of the non-grounding neutral point system according to claim 2, wherein the second criterion is as follows:
Figure FDA0002612752440000014
and theta2-θ3∈[0°～60°)。
5. The method for locating the single-phase disconnection and load-side grounding fault section of the neutral point ungrounded system according to claim 2, wherein the third criterion is as follows:
Figure FDA0002612752440000015
and theta3-θ1∈[0°～60°)。
CN202010759800.7A 2020-07-31 2020-07-31 Method for positioning single-phase disconnection and load side grounding fault section of neutral point ungrounded system Pending CN111679157A (en)

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CN112595923A (en) * 2020-11-24 2021-04-02 国网河南省电力公司电力科学研究院 Positioning method for single-phase disconnection fault section of ungrounded system of power distribution network
CN113484660A (en) * 2021-05-26 2021-10-08 贵州电网有限责任公司 10kV distribution line single-phase line break and ground crash fault identification method and system based on bus zero sequence voltage information
CN113484661A (en) * 2021-05-26 2021-10-08 贵州电网有限责任公司 10kV distribution line single-phase line break fault direction detection method and system based on line voltage change information
CN113567811A (en) * 2021-08-13 2021-10-29 广东电网有限责任公司 Distribution line single-phase fault detection method and related device

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CN112595923A (en) * 2020-11-24 2021-04-02 国网河南省电力公司电力科学研究院 Positioning method for single-phase disconnection fault section of ungrounded system of power distribution network
CN113484660A (en) * 2021-05-26 2021-10-08 贵州电网有限责任公司 10kV distribution line single-phase line break and ground crash fault identification method and system based on bus zero sequence voltage information
CN113484661A (en) * 2021-05-26 2021-10-08 贵州电网有限责任公司 10kV distribution line single-phase line break fault direction detection method and system based on line voltage change information
CN113567811A (en) * 2021-08-13 2021-10-29 广东电网有限责任公司 Distribution line single-phase fault detection method and related device
CN113567811B (en) * 2021-08-13 2023-02-17 广东电网有限责任公司 Distribution line single-phase fault detection method and related device

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