CN111175609B - Power distribution network line fault positioning method and system - Google Patents

Power distribution network line fault positioning method and system Download PDF

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CN111175609B
CN111175609B CN202010081955.XA CN202010081955A CN111175609B CN 111175609 B CN111175609 B CN 111175609B CN 202010081955 A CN202010081955 A CN 202010081955A CN 111175609 B CN111175609 B CN 111175609B
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voltage signal
fault
pulse voltage
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partial discharge
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CN111175609A (en
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刘红文
赵现平
张春丽
王科
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Electric Power Research Institute of Yunnan Power Grid Co Ltd
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Electric Power Research Institute of Yunnan 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
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
    • G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
    • 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

In the power distribution network line fault positioning method and system provided by the application, when a single-phase earth fault and a latent fault occur in the power distribution network, a pulse voltage signal is generated, the partial discharge detection sensor closest to the fault point o firstly detects the pulse voltage signal, and then the moment t when the pulse signal is firstly detected is analyzedxAnd corresponding position x, finding out detection positions y and z at two sides of the position x, and detecting the moment t of the first pulse voltage signal relative to the power frequency voltage signal at the position yyThe moment t of the first pulse voltage signal relative to the power frequency voltage signal is detected at the position zzThen, judging that the fault point o is positioned between a position x and a position y or between the position x and the position z, and finally respectively calculating the specific position of the fault point o from the position x, namely completing the positioning of the fault; according to the method and the device, online distance measurement and fault location can be quickly and accurately realized, and the power supply reliability of the power grid is effectively improved.

Description

Power distribution network line fault positioning method and system
Technical Field
The application relates to the technical field of power grid fault detection, in particular to a power distribution network line fault positioning method and system.
Background
The distribution network is as the supply and demand tie of connecting transmission network and power consumer, has that line structure changes many, the characteristics that the fault situation is complicated, and line fault can seriously influence the safe and stable operation of electric wire netting, and the most common trouble of distribution lines is single-phase earth fault and latent fault, and accurate positioning trouble is the key technology that reduces the power off time and quickens power restoration, and how to improve fault location speed, reduce the fault location degree of difficulty is the problem that the field personnel await the solution urgently.
The current common fault location methods include: the first method comprises the following steps: acquiring a corresponding recording file directory from a terminal according to fault brief information by using a recording signal and fault brief information sent by a monitoring fault indicator, carrying out topology analysis on the recording file directory, searching a bus area to which a power grid line corresponding to a recording file belongs, calculating fault characteristic quantity of each line in the bus area, and regarding the line with the maximum unit difference current as a fault line; the second method comprises the following steps: each fault positioning terminal divides the power distribution network into sections, acquires data of each fault positioning terminal, processes current and voltage data collected by each terminal according to the recording data, and judges whether the power distribution network has a ground fault or not according to comparison of processing results of each terminal data.
However, the first method can only determine the line with the fault, and cannot determine the position of the fault; in the second method, only the section with the fault can be determined, if the range of the section obtained by fault location is required to be smaller, a plurality of fault location terminals are required to be built, and the position with the fault cannot be accurately determined.
Disclosure of Invention
The application provides a power distribution network line fault positioning method and system, which aim to solve the technical problem of accurately determining the position of a fault in a power distribution network.
In order to solve the technical problem, the embodiment of the application discloses the following technical scheme:
in a first aspect, the present application provides a method for locating a fault of a power distribution network line, where the method includes:
injecting a pulse voltage signal into the line by using a pulse signal generating device;
a partial discharge detection sensor is arranged at each position to be detected;
acquiring and storing the distance between any two positions to be detected and the propagation time of the pulse voltage signal between any two positions to be detected according to the pulse voltage signal detected by the partial discharge detection sensor;
when the power distribution network has a fault, the partial discharge detection sensor transmits a pulse voltage signal generated during the collected fault to the control center;
acquiring the moment t of generating a pulse voltage signal relative to a power frequency voltage signal when a fault is firstly acquiredxAnd a position x corresponding to the partial discharge detection sensor;
respectively obtaining a position y at one side of the position x and a moment t of detecting the first pulse voltage signal relative to the power frequency voltage signal at the position yyAnd the time t of detecting the first pulse voltage signal relative to the power frequency voltage signal at the position z and the position y which are positioned at the other side of the position xz；
According to tx、ty、tzThe time required for the propagation of the pulse voltage signal between the position x and the position y and between the position x and the position z is saved in advance, and the fault point o is judged to be positioned between the position x and the position y or between the position x and the position z;
and calculating the distance from the fault point o to the position x according to the distance between the position x and the position y and the distance between the position x and the position z which are stored in advance.
Optionally, a partial discharge detection sensor is disposed at each position to be detected, and the partial discharge detection sensor includes:
partial discharge detection sensors are respectively arranged at the k position and the k +1 position to be detected, and the partial discharge detection sensors are arranged along a three-phase line.
Optionally, the obtaining and storing the distance between any two positions to be measured and the propagation time of the pulse voltage signal between any two positions to be measured according to the pulse voltage signal detected by the partial discharge detection sensor includes:
the partial discharge detection sensor transmits the acquired pulse voltage signal to a control center;
the control center obtains the phase of the first pulse voltage signal relative to the power frequency voltage of the system
Figure BDA0002380627080000021
The first pulse voltage signal is a pulse voltage signal firstly acquired by a partial discharge detection sensor;
according to
Figure BDA0002380627080000022
Acquiring the propagation time of a pulse voltage signal between a position k and a position k + 1;
according to
Figure BDA0002380627080000023
Obtaining the distance L between the position k and the position k +1k(k+1)Where V is the speed at which the pulse signal propagates in the line, and V is 3 x 108m/s。
Optionally, when the distribution network breaks down, the partial discharge detection sensor transmits the pulse voltage signal generated when the collected fault occurs to the control center, including:
when a single-phase earth fault or a latent fault occurs in the power distribution network, a pulse voltage signal generated when the local discharge detection sensor detects the fault;
synchronizing clocks of all partial discharge detection sensors through a GPS;
recording pulse voltage signals and time generated when the partial discharge detection sensor detects a fault;
and the phase where the pulse voltage signal is the largest is the fault phase.
Optionally, the time t when the pulse voltage signal is generated when the fault is firstly acquired is obtainedxAnd a position x corresponding to the partial discharge detection sensor, including:
the partial discharge detection sensor closest to the fault point o firstly acquires a pulse voltage signal;
the position x is the closest position to the fault point o.
Optionally, said according to tx、ty、tzAnd judging whether the fault point o is located between the position x and the position y or between the position x and the position z by the time required for the pulse voltage signal to propagate between the position x and the position y and between the position x and the position z which are stored in advanceThe method comprises the following steps:
according to
Figure BDA0002380627080000024
Calculating the time difference delta t between the position x and the position y when the pulse signal is detectedyThe time difference Deltat between the detection of the pulse signal at the position x and the detection of the pulse signal at the position zz；
According to Δ ty、ΔtzThe propagation time T of the pulse signal between the position x and the position yxyThe propagation time T of the pulse signal between the position x and the position zxzJudging whether the fault point o is positioned between a position x and a position y or between the position x and the position z;
if Δ tz＝Txz，Δty≠TxyIf the fault point o is located between the position x and the position y;
if Δ ty＝Txy，Δtz≠TxzThen the fault point o is located between position x and position z.
Optionally, according to
Figure BDA0002380627080000025
Obtaining the propagation time T of the pulse voltage signal between the position x and the position yxy；
According to
Figure BDA0002380627080000026
Obtaining the propagation time T of the pulse signal between the position x and the position zxz。
Optionally, the calculating a distance from the fault point o to the position x according to a distance between the position x and the position y and a distance between the position x and the position z, which are pre-stored, includes:
when the fault point o is located between the position x and the position y
Figure BDA0002380627080000031
Obtain the distance from the fault point o to the position x
Figure BDA0002380627080000032
Wherein L isxyIs the distance between position x and position y;
when the fault point o is located between the position x and the position z
Figure BDA0002380627080000033
Obtain the distance from the fault point o to the position x
Figure BDA0002380627080000034
Wherein L isxzIs the distance between position x and position z.
Optionally, according to
Figure BDA0002380627080000035
Obtaining the distance between the position x and the position y, wherein V is the speed of the pulse signal propagating in the circuit, and V is 3 x 108m/s；
According to
Figure BDA0002380627080000036
Obtaining the distance between the position x and the position z, wherein V is the speed of the pulse signal propagating in the circuit, and V is 3 x 108m/s。
In a second aspect, based on the above method for locating a fault of a power distribution network line, the present application further provides a system for locating a fault of a power distribution network line, where the system includes:
the pulse signal generating device is used for injecting a pulse voltage signal into the circuit;
the partial discharge detection sensor is used for detecting a pulse voltage signal in a line and transmitting the pulse voltage signal to a control center;
the partial discharge detection sensor is used for transmitting the collected pulse voltage signal generated in the fault to the control center when the power distribution network is in fault;
the control center is used for acquiring and storing the distance between any two positions to be detected and the propagation time of the pulse voltage signal between any two positions to be detected according to the pulse voltage signal detected by the partial discharge detection sensor;
for obtaining the moment t at which a pulse voltage signal is generated when a fault is first acquiredxAnd locally putElectrically detecting a position x corresponding to the sensor;
for obtaining a position y on one side of the position x and a time t at which the first pulse voltage signal is detected at the position y, respectivelyyA position z on the other side of the position x and a time t when the first pulse voltage signal is detected at the position yz；
For according to tx、ty、tzThe time required for the propagation of the pulse voltage signal between the position x and the position y and between the position x and the position z is saved in advance, and the fault point o is judged to be positioned between the position x and the position y or between the position x and the position z;
and calculating the distance from the fault point o to the position x according to the distance between the position x and the position y and the distance between the position x and the position z which are stored in advance.
Compared with the prior art, the beneficial effect of this application is:
according to the technical scheme, in the power distribution network line fault positioning method and the power distribution network line fault positioning system provided by the application,
(1) the pulse signal generator is used for injecting pulse voltage signals into a line, the partial discharge detection sensors installed on a distribution line detect system voltage signals and transmit the signals to the control center, the control center analyzes the signals, online measurement is carried out according to the phase of a first pulse signal received by each sensor relative to system power frequency voltage, and the distance between the installation positions of any two partial discharge detection sensors and the time required for the pulse signals to propagate between any two partial discharge detection sensors are saved.
(2) When a single-phase earth fault and a latent fault occur in the power distribution network, a pulse voltage signal is generated, the partial discharge detection sensor closest to the fault point o firstly detects the pulse voltage signal, and then the moment t when the pulse signal is firstly detected relative to a power frequency voltage signal is analyzedxAnd corresponding position x, finding out detection positions y and z at two sides of the position x, and detecting the moment t of the first pulse voltage signal relative to the power frequency voltage signal at the position yyThe moment t of the first pulse voltage signal relative to the power frequency voltage signal is detected at the position zzThen according totx、ty、tzAnd judging whether the fault point o is positioned between the position x and the position y or between the position x and the position z by the time required for the propagation of the pulse voltage signals between the position x and the position y and between the position x and the position z, and finally calculating the distance from the fault point o to the position x by the distance between the position x and the position y and the distance between the position x and the position z which are stored in advance, thereby finishing the positioning of the fault.
According to the technical scheme, online distance measurement and fault location can be quickly and accurately realized, the operation and maintenance burden of operation and maintenance personnel is greatly reduced, the fault troubleshooting time is shortened, and the power supply reliability and the intelligent level of a power grid are effectively improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
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In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flowchart of a method for locating a fault of a power distribution network line according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a system phase corresponding to a pulse signal detected by a partial discharge detection sensor according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram illustrating an application principle of the power distribution network line fault location method provided in the embodiment of the present application;
fig. 4 is a schematic diagram illustrating another application principle of the power distribution network line fault location method provided in the embodiment of the present application;
fig. 5 is a schematic structural diagram of a power distribution network line fault location system according to an embodiment of the present disclosure;
the system comprises a power distribution network line 1, a coupling capacitor 2, a partial discharge detection sensor 3, a pulse signal generating device 4 and a control center 5.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the 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 application.
Referring to fig. 1, fig. 1 is a schematic flowchart illustrating a method for locating a fault of a power distribution network line according to an embodiment of the present invention. The method for locating the fault of the power distribution network line provided by the embodiment of the application is described below with reference to fig. 1.
As shown in fig. 1, the present application provides a method for locating a fault of a power distribution network line, where the method includes:
s110: and injecting a pulse voltage signal into the line by using a pulse signal generating device.
S120: and a partial discharge detection sensor is arranged at each position to be detected.
Selecting a position to be measured on the line, installing a partial discharge detection sensor at the position, wherein the position is numbered as k and is represented by the position k, and injecting a pulse signal into the line by using a pulse signal generating device;
and partial discharge detection sensors at the position k and the position k +1 collect system voltage signals and transmit the collected data to a control center.
S130: and acquiring and storing the distance between any two positions to be detected and the propagation time of the pulse voltage signal between any two positions to be detected according to the pulse voltage signal detected by the partial discharge detection sensor.
The partial discharge detection sensor transmits the acquired pulse voltage signal to a control center;
the control center obtains the phase of the first pulse voltage signal relative to the power frequency voltage of the system
Figure BDA0002380627080000041
The first pulse voltage signal is a pulse voltage signal firstly acquired by a partial discharge detection sensor;
according to the formula one:
Figure BDA0002380627080000051
acquiring the propagation time of a pulse voltage signal between a position k and a position k + 1;
according to the formula two:
Figure BDA0002380627080000052
obtaining the distance L between the position k and the position k +1k(k+1)Where V is the speed at which the pulse signal propagates in the line, and V is 3 x 108m/s。
By repeating the steps, the lengths of all sections on the line and the propagation time of the pulse signals on the sections can be calculated and saved.
S140: when the power distribution network breaks down, the partial discharge detection sensor transmits the pulse voltage signal generated during the collected faults to the control center.
When a single-phase earth fault and a latent fault occur in a power distribution network, a pulse signal is generated, when a partial discharge detection sensor detects the pulse signal, clock synchronization of each detection terminal is completed through a GPS, the time when each partial discharge detection sensor detects the pulse signal is recorded, the detected signal and the recorded time are sent to a control center, the control center judges a fault phase in a three-phase power grid according to received data, and the phase where the pulse signal is the largest is the fault phase.
S150: acquiring the moment t of generating a pulse voltage signal relative to a power frequency voltage signal when a fault is firstly acquiredxAnd a position x corresponding to the partial discharge detection sensor.
The partial discharge detection sensor closest to the fault point o firstly detects a fault signal, a data analysis module of the control center analyzes the signal, and the moment t when the pulse signal is firstly detected relative to the power frequency voltage signal is analyzedxAnd corresponding position x, finding out the detection positions y on two sides of the position x,z, and the time t at which the pulse signal is detected at the position yyTime t at which a pulse signal is detected at position zz。
S160: respectively obtaining a position y at one side of the position x and a moment t of detecting the first pulse voltage signal relative to the power frequency voltage signal at the position yyAnd the time t of detecting the first pulse voltage signal relative to the power frequency voltage signal at the position z and the position y which are positioned at the other side of the position xz。
In the above step, it may be determined that the fault point o is located near the position x, and the fault point o is located on the left side or the right side of the position x, so that the position y located on one side of the position x and the time t at which the first pulse voltage signal is detected at the position y relative to the power frequency voltage signal are respectively obtained in S160yAnd the time t of detecting the first pulse voltage signal relative to the power frequency voltage signal at the position z and the position y which are positioned at the other side of the position xz。
S170: according to tx、ty、tzAnd judging whether the fault point o is positioned between the position x and the position y or between the position x and the position z by the time required for the pulse voltage signal to propagate between the position x and the position y and between the position x and the position z, which are stored in advance.
According to the formula one in step S130, the propagation time T of the pulse signal between the position x and the position y can be calculatedxyThe propagation time T of the pulse signal between the position x and the position zxzThe method specifically comprises the following steps:
according to
Figure BDA0002380627080000053
Obtaining the propagation time T of the pulse voltage signal between the position x and the position yxy；
According to
Figure BDA0002380627080000054
Obtaining the propagation time T of the pulse signal between the position x and the position zxz。
Then, according to
Figure BDA0002380627080000055
Calculating the time difference delta t between the position x and the position y when the pulse signal is detectedyThe time difference Deltat between the detection of the pulse signal at the position x and the detection of the pulse signal at the position zz；
If Δ tz＝Txz，Δty≠TxyIf the fault point o is located between the position x and the position y;
if Δ ty＝Txy，Δtz≠TxzThen the fault point o is located between position x and position z.
The section in which the fault point o is located has now been determined, i.e. the fault point o is located between position x and position y or the fault point o is located between position x and position z.
S180: and calculating the distance from the fault point o to the position x according to the distance between the position x and the position y and the distance between the position x and the position z which are stored in advance.
The following two cases are classified according to the section where the fault point o is located:
the first method comprises the following steps: when the fault point o is located between the position x and the position y, specifically referring to fig. 3, fig. 3 shows a schematic diagram of a fault location principle when the fault point o is located between the position x and the position y, specifically including: according to
Figure BDA0002380627080000061
Obtain the distance from the fault point o to the position x
Figure BDA0002380627080000062
Wherein L isxyIs the distance between position x and position y.
Wherein L isxyCalculating according to the formula two in the step S130, specifically: according to
Figure BDA0002380627080000063
Obtaining the distance between the position x and the position y, wherein V is the speed of the pulse signal propagating in the circuit, and V is 3 x 108m/s。
The specific distance from the fault point o to the position x is obtained at this time, that is, the fault point o is located when the fault point o is located between the position x and the position y.
And the second method comprises the following steps: when the fault point o is located between the position x and the position z, specifically referring to fig. 4, fig. 4 shows a schematic diagram of a fault location principle when the fault point o is located between the position x and the position z, specifically including: according to
Figure BDA0002380627080000064
Obtain the distance from the fault point o to the position x
Figure BDA0002380627080000065
Wherein L isxzIs the distance between position x and position z.
Wherein L isxzCalculating according to the formula two in the step S130, specifically: according to
Figure BDA0002380627080000066
Obtaining the distance between the position x and the position z, wherein V is the speed of the pulse signal propagating in the circuit, and V is 3 x 108m/s。
The specific distance from the fault point o to the position x is obtained at this time, that is, the fault point o is located when the fault point o is located between the position x and the position z.
According to the technical scheme, in the power distribution network line fault positioning method provided by the application,
firstly, injecting a pulse voltage signal into a line by using a pulse signal generating device, detecting a system voltage signal by using partial discharge detection sensors installed on a distribution line, transmitting the system voltage signal to a control center, analyzing the signal by the control center, carrying out online measurement according to the phase of a first pulse signal received by each sensor relative to the system power frequency voltage, and storing the distance between the installation positions of any two partial discharge detection sensors and the time required for the pulse signal to propagate between any two partial discharge detection sensors.
When a single-phase earth fault and a latent fault occur in the power distribution network, a pulse voltage signal is generated, the partial discharge detection sensor closest to the fault point o firstly detects the pulse voltage signal, and then the moment t when the pulse signal is firstly detected relative to a power frequency voltage signal is analyzedxAnd corresponding position x, finding out detection positions y and z at two sides of the position x, and detecting the moment t of the first pulse voltage signal relative to the power frequency voltage signal at the position yyThe moment t of the first pulse voltage signal relative to the power frequency voltage signal is detected at the position zzThen according to tx、ty、tzAnd judging whether the fault point o is positioned between the position x and the position y or between the position x and the position z by the time required for the propagation of the pulse voltage signals between the position x and the position y and between the position x and the position z, and finally calculating the distance from the fault point o to the position x by the distance between the position x and the position y and the distance between the position x and the position z which are stored in advance, thereby finishing the positioning of the fault.
According to the technical scheme, online distance measurement and fault location can be quickly and accurately realized, the operation and maintenance burden of operation and maintenance personnel is greatly reduced, the fault troubleshooting time is shortened, and the power supply reliability and the intelligent level of a power grid are effectively improved.
In a second aspect, the present application is based on the foregoing power distribution network line fault location method, and also provides a power distribution network line fault location system, as shown in fig. 5, where the system includes:
the pulse signal generating device 4 is used for injecting a pulse voltage signal into the power distribution network line 1;
the power distribution network line 1 is sequentially provided with a coupling capacitor 2, a pulse signal generating device 4 and a partial discharge detection sensor 3.
The partial discharge detection sensor 3 is used for detecting a pulse voltage signal in the power distribution network line 1 and transmitting the pulse voltage signal to the control center 5;
the partial discharge detection sensor 3 is used for transmitting the collected pulse voltage signal generated in the fault to the control center 5 when the power distribution network has the fault;
the control center 5 is used for acquiring and storing the distance between any two positions to be detected and the propagation time of the pulse voltage signal between any two positions to be detected according to the pulse voltage signal detected by the partial discharge detection sensor 3;
for acquisition of the first acquisition faultTime t of pulse voltage signalxAnd a position x corresponding to the partial discharge detection sensor 3;
for obtaining a position y on one side of the position x and a time t at which the first pulse voltage signal is detected at the position y, respectivelyyA position z on the other side of the position x and a time t when the first pulse voltage signal is detected at the position yz；
For according to tx、ty、tzThe time required for the propagation of the pulse voltage signal between the position x and the position y and between the position x and the position z is saved in advance, and the fault point o is judged to be positioned between the position x and the position y or between the position x and the position z;
and calculating the distance from the fault point o to the position x according to the distance between the position x and the position y and the distance between the position x and the position z which are stored in advance.
Since the above embodiments are all described by referring to and combining with other embodiments, the same portions are provided between different embodiments, and the same and similar portions between the various embodiments in this specification may be referred to each other. And will not be described in detail herein.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
The above-described embodiments of the present application do not limit the scope of the present application.

Claims (9)

1. A power distribution network line fault locating method is characterized by comprising the following steps:
injecting a pulse voltage signal into the line by using a pulse signal generating device;
a partial discharge detection sensor is arranged at each position to be detected;
acquiring and storing the propagation time of the pulse voltage signal between any two positions to be detected and the distance between any two positions to be detected according to the pulse voltage signal detected by the partial discharge detection sensor;
when the power distribution network has a fault, the partial discharge detection sensor transmits a pulse voltage signal generated during the collected fault to the control center;
acquiring the moment t of generating a pulse voltage signal relative to a power frequency voltage signal when a fault is firstly acquiredxAnd a position x corresponding to the partial discharge detection sensor;
respectively obtaining a position y at one side of the position x and a moment t of detecting the first pulse voltage signal relative to the power frequency voltage signal at the position yyThe position z on the other side of the position x and the moment t of detecting the first pulse voltage signal relative to the power frequency voltage signal at the position zz；
According to the txThe t isyThe t iszThe time required for the pulse voltage signal to propagate between the position x and the position y and between the position x and the position z is saved in advance, and the fault point o is judged to be positioned in the interval between the position x and the position y or between the position x and the position z;
calculating the distance from the fault point o to the position x according to the distance between the position x and the position y and the distance between the position x and the position z which are stored in advance;
wherein, according to the partial discharge detection sensor detects the impulse voltage signal obtains and keeps the time of impulse voltage signal propagation between arbitrary two positions to be measured and the distance between arbitrary two positions to be measured, include:
the partial discharge detection sensor transmits the acquired pulse voltage signal to a control center;
the control center obtains the phase of the first pulse voltage signal relative to the power frequency voltage of the system
Figure FDA0003426102550000013
Wherein the first pulse voltage signal is collected by the partial discharge detection sensor firstThe pulse voltage signal;
according to
Figure FDA0003426102550000011
Acquiring the propagation time of a pulse voltage signal between a position k and a position k + 1;
according to
Figure FDA0003426102550000012
Obtaining the distance L between the position k and the position k +1k(k+1)Where V is the speed at which the pulse signal propagates in the line, and V is 3 x 108m/s。
2. The method for locating the line faults of the power distribution network according to claim 1, wherein a partial discharge detection sensor is arranged at each position to be detected, and the method comprises the following steps:
partial discharge detection sensors are respectively arranged at the k position and the k +1 position to be detected, and the partial discharge detection sensors are arranged along a three-phase line.
3. The method for locating the line fault of the power distribution network according to claim 1, wherein when the power distribution network has a fault, the partial discharge detection sensor transmits a pulse voltage signal generated when the fault is collected to a control center, and the method comprises the following steps:
when a single-phase earth fault or a latent fault occurs in the power distribution network, a pulse voltage signal generated when the local discharge detection sensor detects the fault;
synchronizing clocks of all partial discharge detection sensors through a GPS;
recording pulse voltage signals and time generated when the partial discharge detection sensor detects a fault;
and the phase where the pulse voltage signal is the largest is the fault phase.
4. The method according to claim 1, wherein the obtaining is performed by first acquiring a pulse voltage signal generated when a fault is detected, relative to a power frequency voltage signalTime txAnd a position x corresponding to the partial discharge detection sensor, including:
the partial discharge detection sensor closest to the fault point o firstly acquires a pulse voltage signal;
the position x is the closest position to the fault point o.
5. The method according to claim 1, wherein the method comprises the step of locating the fault according to the txThe t isyThe t iszAnd the time required for the propagation of the pre-stored pulse voltage signal between the position x and the position y and between the position x and the position z is used for judging that the fault point o is positioned between the position x and the position y or between the position x and the position z, and the method comprises the following steps:
according to
Figure FDA0003426102550000021
Calculating the time difference delta t between the position x and the position y when the pulse signal is detectedyThe time difference Deltat between the detection of the pulse signal at the position x and the detection of the pulse signal at the position zz；
According to Δ ty、ΔtzThe propagation time T of the pulse signal between the position x and the position yxyThe propagation time T of the pulse signal between the position x and the position zxzJudging whether the fault point o is located in a range between the position x and the position y or a range between the position x and the position z;
if Δ tz＝Txz，Δty≠TxyIf the fault point o is located between the position x and the position y;
if Δ ty＝Txy，Δtz≠TxzThen the fault point o is located between position x and position z.
6. The distribution network line fault location method of claim 1,
according to
Figure FDA0003426102550000022
Obtaining the propagation time T of the pulse voltage signal between the position x and the position yxy；
According to
Figure FDA0003426102550000023
Obtaining the propagation time T of the pulse signal between the position x and the position zxz。
7. The method for locating faults of power distribution network lines according to claim 1, wherein the step of calculating the distance from the fault point o to the position x according to the distance between the position x and the position y and the distance between the position x and the position z, which are stored in advance, comprises the following steps:
when the fault point o is located between the position x and the position y
Figure FDA0003426102550000024
Obtain the distance from the fault point o to the position x
Figure FDA0003426102550000025
Wherein L isxyIs the distance between position x and position y;
when the fault point o is located between the position x and the position z
Figure FDA0003426102550000026
Obtain the distance from the fault point o to the position x
Figure FDA0003426102550000027
Wherein L isxzIs the distance between position x and position z.
8. The distribution network line fault location method of claim 1,
according to
Figure FDA0003426102550000028
Obtaining the distance between the position x and the position y, wherein V is the speed of the pulse signal propagating in the circuit, and V is 3 x 108m/s；
According to
Figure FDA0003426102550000029
Obtaining the distance between the position x and the position z, wherein V is the speed of the pulse signal propagating in the circuit, and V is 3 x 108m/s。
9. A power distribution network line fault location system, the system comprising:
the pulse signal generating device is used for injecting a pulse voltage signal into the circuit;
the partial discharge detection sensor is used for detecting a pulse voltage signal in a line and transmitting the pulse voltage signal to a control center;
the partial discharge detection sensor is used for transmitting the collected pulse voltage signal generated in the fault to the control center when the power distribution network is in fault;
the control center is used for acquiring and storing the propagation time of the pulse voltage signal between any two positions to be detected and the distance between any two positions to be detected according to the pulse voltage signal detected by the partial discharge detection sensor; for obtaining the time t of generating pulse voltage signal relative to power frequency voltage signal when the first fault is collectedxAnd a position x corresponding to the partial discharge detection sensor;
used for respectively obtaining a position y at one side of the position x and a moment t of detecting the first pulse voltage signal relative to the power frequency voltage signal at the position yyAnd the time t of detecting the first pulse voltage signal relative to the power frequency pulse voltage signal at the position z and the position y which are positioned at the other side of the position xz；
For according to said txThe t isyThe t iszThe time required for the propagation of the pulse voltage signal between the position x and the position y and between the position x and the position z is saved in advance, and the fault point o is judged to be positioned between the position x and the position y or between the position x and the position z;
the distance between the fault point o and the position x is calculated according to the distance between the position x and the position y and the distance between the position x and the position z which are stored in advance;
wherein, according to the partial discharge detection sensor detects the impulse voltage signal obtains and keeps the time of impulse voltage signal propagation between arbitrary two positions to be measured and the distance between arbitrary two positions to be measured, include:
the partial discharge detection sensor transmits the acquired pulse voltage signal to a control center;
the control center obtains the phase of the first pulse voltage signal relative to the power frequency voltage of the system
Figure FDA0003426102550000033
The first pulse voltage signal is a pulse voltage signal firstly acquired by a partial discharge detection sensor;
according to
Figure FDA0003426102550000031
Acquiring the propagation time of a pulse voltage signal between a position k and a position k + 1;
according to
Figure FDA0003426102550000032
Obtaining the distance L between the position k and the position k +1k(k+1)Where V is the speed at which the pulse signal propagates in the line, and V is 3 x 108m/s。
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