CN111175611A - 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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Publication number
CN111175611A
CN111175611A CN202010081972.3A CN202010081972A CN111175611A CN 111175611 A CN111175611 A CN 111175611A CN 202010081972 A CN202010081972 A CN 202010081972A CN 111175611 A CN111175611 A CN 111175611A
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fault
distance
detected
distribution network
pulse voltage
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CN111175611B (en
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刘红文
张春丽
柴晨超
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

Abstract

In the power distribution network line fault positioning method and system provided by the application, when a power distribution network fails, a pulse voltage signal is generated, the apparent discharge amount detected by the partial discharge detection sensor closest to the fault point o is the largest, and then the detected maximum apparent discharge amount q is analyzedxAnd corresponding position x, finding the detection positions y and z on both sides of the position x, and the apparent discharge amount q detected at the position yyApparent amount of discharge q detected at position zzThen according to qx、qy、qzJudging whether the fault point o is located in the interval between the position x and the position y or the interval between the position x and the position z by the pre-stored distance between the position x and the position y of the pulse voltage signal and the attenuation coefficient in the propagation process between the position x and the position z; and calculating the distance from the fault point o to the position x according to the pre-stored distance between the position x and the position y and the distance between the position x and the position z, and finishing the positioning of the fault at the moment. The technical scheme can quickly and accurately realizeAnd realizing online distance measurement and fault location.

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, performing 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 a power distribution network line by using a pulse signal generating device;
a partial discharge detection sensor is arranged at each position to be detected;
respectively acquiring and storing the distance between any two positions to be detected and the attenuation coefficient of the pulse voltage signal in the propagation process of any two positions to be detected according to the phase and the apparent discharge amount of the pulse voltage signal detected by the partial discharge detection sensor;
when the power distribution network breaks down, the local discharge detection sensor transmits the acquired pulse voltage signals and the apparent discharge amount generated during the failure to the control center;
obtaining the maximum apparent discharge q in faultxAnd a position x corresponding to the partial discharge detection sensor;
respectively acquiring a position y on one side of the position x and an apparent discharge amount q detected at the position yyA position z on the other side of the position x and a time q at which the first pulse signal is detected at the position zz；
According to qx、qy、qzJudging whether the fault point o is located in the interval between the position x and the position y or the interval between the position x and the position z by using the prestored attenuation coefficient of the pulse voltage signal in the propagation process between the position x and the position y and 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 arranged at a position k-1, a position k and a position k +1 to be detected to collect system voltage signals, wherein the position k-1 and the position k +1 are positioned at two adjacent sides of the position k.
Optionally, the obtaining and storing the distance between any two positions to be measured and the attenuation coefficient of the pulse voltage signal in the propagation process of any two positions to be measured according to the phase and the apparent discharge amount of the pulse voltage signal detected by the partial discharge detection sensor respectively includes:
the partial discharge detection sensor transmits the acquired pulse voltage signal to a control center;
the control center acquires the phases of the corresponding system voltages when the partial discharge detection sensors at the position k-1, the position k and the position k +1 detect the pulse signals
Figure BDA0002380627020000021
Apparent discharge amount q detected by partial discharge detection sensors at position k-1, position k, and position k +1k-1、qk、qk+1；
According to
Figure BDA0002380627020000022
The distance L between the position k-1 and the position k is obtained(k-1)kA 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 V3 x 108m/s；
According to
Figure BDA0002380627020000023
Obtaining attenuation coefficient M of pulse signal from position k to position k-1k(k-1)Attenuation coefficient M of pulse signal propagating from position k to position k +1k(k+1)。
Optionally, when the distribution network breaks down, pulse voltage signal and apparent discharge amount that the partial discharge detection sensor produced when the trouble that will gather transmit control center, include:
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 apparent discharge amount 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 maximum apparent discharge amount q during the fault is obtainedxAnd a position x corresponding to the partial discharge detection sensor, including:
the apparent discharge amount collected by the partial discharge detection sensor closest to the fault point o is the largest;
the position x is the closest position to the fault point o.
Optionally, said is according to qx、qy、qzAnd the pre-stored distance between the position x and the position y of the pulse voltage signal and the attenuation coefficient in the propagation process between the position x and the position z are used for judging whether the fault point o is positioned in the interval between the position x and the position y or the interval between the position x and the position z, and the method comprises the following steps:
according to
Figure BDA0002380627020000024
Calculating the difference M of attenuation coefficients of the pulse signal in the propagation between the position x and the position yyAnd the difference M of attenuation coefficients of the pulse signal propagating between the position x and the position zzWherein L isxyIs the distance between position x and position y, LxzIs the distance between position x and position z, qxThe maximum apparent discharge quantity is acquired when a fault occurs;
according to My、MzThe attenuation coefficient M of the pulse signal pre-stored in the system from the position x to the position yxyAttenuation coefficient M for pulse signal propagating from position x to 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 My≠Mxy，Mz＝MxzIf the fault point o is located between the position x and the position y;
if M isy＝Mxy，Mz≠MxzThen the fault point o is located between position x and position z.
Optionally, according to
Figure BDA0002380627020000031
Obtaining the distance between the position x and the position y, wherein V is the propagation speed of the pulse signal in the line, and V is 3 x 108m/s；
According to
Figure BDA0002380627020000032
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。
Optionally, according to
Figure BDA0002380627020000033
Obtaining and pre-storing attenuation coefficient M of pulse signal from position x to position yxyWherein q isx1qy1Respectively the apparent discharge amount collected at the position x and the position y when a pulse voltage signal is injected into the circuit by using a pulse signal device;
according to
Figure BDA0002380627020000034
Obtaining and pre-storing attenuation coefficient M of pulse signal from position x to position yxyWherein q isx1qz1The apparent discharge amounts collected at the position x and the position z when the pulse voltage signal is injected into the line by the pulse signal device are respectively.
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 BDA0002380627020000035
Obtain the distance from the fault point o to the position x
Figure BDA0002380627020000036
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 BDA0002380627020000037
Obtain the distance from the fault point o to the position x
Figure BDA0002380627020000038
Wherein L isxzIs the distance between position x and position z.
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 a power distribution network line;
the partial discharge detection sensor is used for detecting a pulse voltage signal in a power distribution network line;
the local discharge detection sensor is used for transmitting the acquired pulse voltage signals and the apparent discharge amount generated in the fault to the control center when the power distribution network is in fault;
the control center is used for respectively acquiring and storing the distance between any two positions to be detected and the attenuation coefficient of the pulse voltage signal in the propagation process of any two positions to be detected according to the phase and the apparent discharge amount of the pulse voltage signal detected by the partial discharge detection sensor;
for obtaining maximum apparent discharge q in faultxAnd a position x corresponding to the partial discharge detection sensor;
for obtaining an apparent discharge amount q detected at a position y on one side of the position x and at the position y, respectivelyyA position z on the other side of the position x and a time q at which the first pulse signal is detected at the position zz；
For according to qx、qy、qzJudging whether the fault point o is located in the interval between the position x and the position y or the interval between the position x and the position z by using the prestored attenuation coefficient of the pulse voltage signal in the propagation process between the position x and the position y and 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 voltage signal is injected into a line by using a pulse signal generating device, the partial discharge detection sensors installed on the distribution line detect the voltage signal of the system and transmit the signal to a control center, and the control center analyzes the signal, acquires the distance between any two positions to be detected and the attenuation coefficient of the pulse voltage signal in the transmission process of any two positions to be detected on line according to the phase and the apparent discharge amount of the pulse signal received by each sensor and stores the distance between any two positions to be detected.
(2) When a single-phase earth fault and a latent fault occur in the power distribution network, a pulse voltage signal is generated, and the detected maximum apparent discharge amount q is analyzed on the premise that the apparent discharge amount detected by the partial discharge detection sensor closest to the fault point o is maximumxAnd corresponding position x, detecting positions y and z on both sides of the position x, and apparent discharge amount q detected at the position yyApparent amount of discharge q detected at position zzThen according to qx、qy、qzJudging whether the fault point o is located in the interval between the position x and the position y or the interval between the position x and the position z by using the prestored attenuation coefficient of the pulse voltage signal in the propagation process between the position x and the position y and 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, and finishing the positioning of the fault at this moment.
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.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings needed to be used in the embodiments are briefly described below, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without any inventive effort.
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 the variation of attenuation coefficient of an impulse signal during propagation according to an embodiment of the present application;
fig. 4 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. 5 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. 6 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 power distribution network 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-1, the position k and the position k +1 collect system voltage signals and transmit the collected data to a control center, wherein the position k-1 and the position k +1 are arranged at two sides of the position k and are adjacent to the position k.
S130: and respectively acquiring and storing the distance between any two positions to be detected and the attenuation coefficient of the pulse voltage signal in the propagation process of any two positions to be detected according to the phase and the apparent discharge amount of 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 acquires the phases of the corresponding system voltages when the partial discharge detection sensors at the position k-1, the position k and the position k +1 detect the pulse signals
Figure BDA0002380627020000051
Apparent discharge amount q detected by partial discharge detection sensors at position k-1, position k, and position k +1k-1、qk、qk+1(ii) a Fig. 2 is a schematic phase diagram of a system corresponding to the partial discharge detection sensor detecting the pulse signal in the embodiment of the present application.
Calculating the distanceFormula (II):
Figure BDA0002380627020000052
respectively obtaining the distance L between the position k-1 and the position k(k-1)kA distance L between the position k and the position k +1k(k+1)Where V is the speed of the pulse signal propagating in the line, and V-3 x 108m/s；
According to the attenuation coefficient calculation formula:
Figure BDA0002380627020000053
obtaining attenuation coefficient M of pulse signal propagating from position k to position k-1k(k-1)Attenuation coefficient M of pulse signal propagating from position k to position k +1k(k+1)Fig. 3 can be referred to as a schematic diagram of the change of the attenuation coefficient, and fig. 3 is a schematic diagram of the change of the attenuation coefficient of the pulse signal in the propagation process in the embodiment of the present application.
And repeating the steps, calculating the lengths of all sections on the line and the attenuation coefficient of the pulse signal propagating on the sections, and recording.
S140: when the power distribution network breaks down, the partial discharge detection sensor transmits the pulse voltage signals and the apparent discharge amount generated during the collected faults to the control center.
When the power distribution network has single-phase earth faults and latent faults, pulse signals are generated, when the local discharge detection sensor detects the pulse signals, the detected apparent discharge amount is recorded, the detected signals are transmitted to the control center, the control center judges fault phases in the three-phase power grid according to the received data, and the phase where the pulse signals are the largest is the fault phase.
S150: obtaining the maximum apparent discharge q in faultxAnd a position x corresponding to the partial discharge detection sensor.
And determining that the position x is the position closest to the fault point o based on the maximum apparent discharge amount acquired by the partial discharge detection sensor closest to the fault point o.
S160: respectively acquiring a position y on one side of the position x and an apparent discharge amount q detected at the position yyA position z on the other side of the position x and an apparent discharge amount q detected at the position zz。
The apparent discharge amount detected by the partial discharge detection sensor closest to the fault point is maximum, and a data analysis module of the control center analyzes the signal to analyze the detected maximum apparent discharge amount qxAnd corresponding position x, finding the detection positions y and z on both sides of the position x, and the apparent discharge amount q detected at the position yyApparent amount of discharge q detected at position zz。
S170: according to qx、qy、qzAnd judging whether the fault point o is positioned in the interval between the position x and the position y or the interval between the position x and the position z by the prestored distance between the position x and the position y of the pulse voltage signal and the attenuation coefficient in the propagation process between the position x and the position z.
According to
Figure BDA0002380627020000061
Calculating the difference M of attenuation coefficients of the pulse signal in the propagation between the position x and the position yyAnd the difference M of attenuation coefficients of the pulse signal propagating between the position x and the position zzWherein L isxyIs the distance between position x and position y, LxzIs the distance between position x and position z, qxThe maximum apparent discharge quantity is acquired when a fault occurs;
Myand MzIs based on the maximum apparent discharge amount q collected at the time of occurrence of the fault detected by the partial discharge detection sensor closest to the fault pointxAnd corresponding position x, finding detected positions y, z on both sides of the position x, and the apparent discharge amount q detected at the position yyApparent amount of discharge q detected at position zz。
And the attenuation coefficient M of the pulse signal pre-stored in the system from the position x to the position yxyAttenuation coefficient M of pulse signal propagating from position x to position zxzThe circuit is based on the apparent discharge amount acquired when a pulse signal is injected into a circuit by a pulse signal generating device.
According to My、MzThe attenuation coefficient M of the pulse signal pre-stored in the system from the position x to the position yxyAttenuation coefficient M for pulse signal propagating from position x to 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 My≠Mxy，Mz＝MxzIf the fault point o is located between the position x and the position y;
if M isy＝Mxy，Mz≠MxzThen the fault point o is located between position x and position z.
At this time, the section judgment of the fault point o is completed.
Wherein the distance L between the position x and the position y is calculated according to the distance calculation formula in the step S130xyAnd the distance between the position x and the position z is specifically as follows:
according to
Figure BDA0002380627020000062
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 BDA0002380627020000063
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。
Calculating the attenuation coefficient M of the pulse signal from the position x to the position y according to the attenuation coefficient calculation formula in the step S130xyAttenuation coefficient M for pulse signal propagating from position x to position zxzThe method specifically comprises the following steps:
according to
Figure BDA0002380627020000064
Obtaining and pre-storing attenuation coefficient M of pulse signal from position x to position yxyWherein q isx1qy1Respectively acquired at position x and position y when pulse voltage signal is injected into the line by pulse signal deviceApparent discharge amount;
according to
Figure BDA0002380627020000065
Obtaining and pre-storing attenuation coefficient M of pulse signal from position x to position yxyWherein q isx1qz1The apparent discharge amounts collected at the position x and the position z when the pulse voltage signal is injected into the line by the pulse signal device are respectively.
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.
When the fault point o is located between the position x and the position y
Figure RE-GDA0002445253910000071
Obtain the distance from the fault point o to the position x
Figure RE-GDA0002445253910000072
Wherein L isxyIs the distance between position x and position y; referring to fig. 4, a positioning process may be performed, and fig. 4 is a schematic diagram illustrating an application principle of the power distribution network line fault positioning method provided in the embodiment of the present application.
When the fault point o is located between the position x and the position z
Figure BDA0002380627020000071
Obtain the distance from the fault point o to the position x
Figure BDA0002380627020000072
Wherein L isxzFor the distance between the position x and the position z, the positioning process may refer to fig. 5, and fig. 5 is a schematic diagram of another application principle of the power distribution network line fault positioning method provided in the embodiment of the present application.
At this point, the accurate positioning of the fault point o is completed.
According to the technical scheme, in the power distribution network line fault positioning method provided by the application,
the pulse signal generating device is used for injecting pulse voltage signals into a line, partial discharge detection sensors installed on a distribution line detect the voltage signals of the system and transmit the signals to the control center, and the control center analyzes the signals, acquires the distance between any two positions to be detected and stores the attenuation coefficient of the pulse voltage signals in the transmission process of any two positions to be detected on line according to the phase and apparent discharge amount of the pulse signals received by each sensor.
When a single-phase earth fault and a latent fault occur in the power distribution network, a pulse voltage signal is generated, and the detected maximum apparent discharge amount q is analyzed on the premise that the apparent discharge amount detected by the partial discharge detection sensor closest to the fault point o is maximumxAnd corresponding position x, finding the detection positions y and z on both sides of the position x, and the apparent discharge amount q detected at the position yyApparent amount of discharge q detected at position zzThen according to qx、qy、qzJudging whether the fault point o is located in the interval between the position x and the position y or the interval between the position x and the position z by using the prestored attenuation coefficient of the pulse voltage signal in the propagation process between the position x and the position y and 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, and finishing the positioning of the fault at this moment.
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. 6, 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 pulse voltage signals in the power distribution network line;
when the power distribution network has a fault, the partial discharge detection sensor 3 transmits the acquired pulse voltage signals and the apparent discharge amount generated in the fault to the control center;
the control center 5 is used for respectively acquiring and storing the distance between any two positions to be detected and the attenuation coefficient of the pulse voltage signal in the propagation process of any two positions to be detected according to the phase and the apparent discharge amount of the pulse voltage signal detected by the partial discharge detection sensor 3;
for obtaining maximum apparent discharge q in faultxAnd a position x corresponding to the partial discharge detection sensor 3;
for obtaining an apparent discharge amount q detected at a position y on one side of the position x and at the position y, respectivelyyA position z on the other side of the position x and a time q at which the first pulse signal is detected at the position zz；
For according to qx、qy、qzJudging whether the fault point o is located in the interval between the position x and the position y or the interval between the position x and the position z by using the prestored attenuation coefficient of the pulse voltage signal in the propagation process between the position x and the position y and 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 (10)

1. A power distribution network line fault locating method is characterized by comprising the following steps:
injecting a pulse voltage signal into a power distribution network line by using a pulse signal generating device;
a partial discharge detection sensor is arranged at each position to be detected;
respectively acquiring and storing the distance between any two positions to be detected and the attenuation coefficient of the pulse voltage signal in the propagation process of any two positions to be detected according to the phase and the apparent discharge amount of the pulse voltage signal detected by the partial discharge detection sensor;
when the power distribution network breaks down, the local discharge detection sensor transmits the acquired pulse voltage signals and the apparent discharge amount generated during the failure to the control center;
obtaining the maximum apparent discharge q in faultxAnd a position x corresponding to the partial discharge detection sensor;
respectively acquiring a position y on one side of the position x and an apparent discharge amount q detected at the position yyA position z on the other side of the position x and an apparent discharge amount q detected at the position zz；
According to qx、qy、qzJudging whether the fault point o is located in the interval between the position x and the position y or the interval between the position x and the position z by using the prestored attenuation coefficient of the pulse voltage signal in the propagation process between the position x and the position y and 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.
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 arranged at a position k-1, a position k and a position k +1 to be detected to collect system voltage signals, wherein the position k-1 and the position k +1 are positioned at two adjacent sides of the position k.
3. The method for locating the line fault of the power distribution network according to claim 1, wherein the step of respectively obtaining and storing the distance between any two positions to be measured and the attenuation coefficient of the pulse voltage signal in the propagation process of any two positions to be measured according to the phase and the apparent discharge amount of the pulse voltage signal detected by the partial discharge detection sensor comprises:
the partial discharge detection sensor transmits the acquired pulse voltage signal to a control center;
the control center acquires the phases of the corresponding system voltages when the partial discharge detection sensors at the position k-1, the position k and the position k +1 detect the pulse signals
Figure FDA0002380627010000011
Apparent discharge amount q detected by partial discharge detection sensors at positions k-1, k and k +1k-1、qk、qk+1；
According to
Figure FDA0002380627010000012
Respectively obtaining the distance L between the position k-1 and the position k(k-1)kA 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；
According to
Figure FDA0002380627010000013
Obtaining attenuation coefficient M of pulse signal from position k to position k-1k(k-1)Attenuation coefficient M of pulse signal propagating from position k to position k +1k(k+1)。
4. 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 the collected pulse voltage signal and the apparent discharge amount generated in the fault to the 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 apparent discharge amount 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.
5. The method for locating the fault of the power distribution network line according to claim 1, wherein the maximum apparent discharge amount q when the fault occurs is obtainedxAnd a position x corresponding to the partial discharge detection sensor, including:
the apparent discharge amount collected by the partial discharge detection sensor closest to the fault point o is the largest;
the position x is the closest position to the fault point o.
6. The method according to claim 1, wherein the q is a function of the line fault locationx、qy、qzAnd the pre-stored distance between the position x and the position y of the pulse voltage signal and the attenuation coefficient in the propagation process between the position x and the position z judge that the fault point o is positioned in the interval between the position x and the position y or the interval between the position x and the position z, and the method comprises the following steps:
according to
Figure FDA0002380627010000021
Calculating the difference M of attenuation coefficients of the pulse signal in the propagation between the position x and the position yyAnd the difference M of attenuation coefficients of the pulse signal in propagation between the position x and the position zzWherein L isxyBetween position x and position yDistance of (D), LxzIs the distance between position x and position z, qxThe maximum apparent discharge quantity is acquired when a fault occurs;
according to My、MzThe attenuation coefficient M of the pulse signal pre-stored in the system from the position x to the position yxyAttenuation coefficient M for pulse signal propagating from position x to 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 My≠Mxy，Mz＝MxzIf the fault point o is located between the position x and the position y;
if M isy＝Mxy，Mz≠MxzThen the fault point o is located between position x and position z.
7. The distribution network line fault location method of claim 3,
according to
Figure FDA0002380627010000022
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 FDA0002380627010000023
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。
8. The distribution network line fault location method of claim 3,
according to
Figure FDA0002380627010000024
Obtaining and pre-storing attenuation coefficient M of pulse signal from position x to position yxyWherein q isx1qy1Respectively injecting pulse voltage signals into the line by means of pulse signal devicesThe apparent discharge amounts collected at the time position x and the position y;
according to
Figure FDA0002380627010000025
Obtaining and pre-storing attenuation coefficient M of pulse signal from position x to position yxyWherein q isx1qz1Respectively, the apparent discharge amounts collected at the position x and the position z when the pulse voltage signal is injected into the line by the pulse signal device.
9. 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 FDA0002380627010000031
Obtain the distance from the fault point o to the position x
Figure FDA0002380627010000032
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 FDA0002380627010000033
Obtain the distance from the fault point o to the position x
Figure FDA0002380627010000034
Wherein L isxzIs the distance between position x and position z.
10. 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 a power distribution network line;
the partial discharge detection sensor is used for detecting a pulse voltage signal in a power distribution network line;
the local discharge detection sensor is used for transmitting the acquired pulse voltage signals and the apparent discharge amount generated in the fault to the control center when the power distribution network is in fault;
the control center is used for respectively acquiring and storing the distance between any two positions to be detected and the attenuation coefficient of the pulse voltage signal in the propagation process of any two positions to be detected according to the phase and the apparent discharge amount of the pulse voltage signal detected by the partial discharge detection sensor;
for obtaining maximum apparent discharge q in faultxAnd a position x corresponding to the partial discharge detection sensor;
for obtaining an apparent discharge amount q detected at a position y on one side of the position x and at the position y, respectivelyyA position z located on the other side of the position x, and a time q at which the first pulse signal is detected at the position zz；
For according to qx、qy、qzJudging whether the fault point o is located in the interval between the position x and the position y or the interval between the position x and the position z by using the prestored attenuation coefficient of the pulse voltage signal in the propagation process between the position x and the position y and 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.
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