CN110672979B - Power distribution network line fault diagnosis system and method - Google Patents

Power distribution network line fault diagnosis system and method Download PDF

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Publication number
CN110672979B
CN110672979B CN201911001299.1A CN201911001299A CN110672979B CN 110672979 B CN110672979 B CN 110672979B CN 201911001299 A CN201911001299 A CN 201911001299A CN 110672979 B CN110672979 B CN 110672979B
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phase
power sensor
online power
distribution network
current value
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CN110672979A (en
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李�瑞
尚筱雅
王永祥
萧泽伦
蔡汝奋
古培瑄
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Dragon Totem Technology Hefei Co ltd
Hebei Jialai Construction Engineering Co.,Ltd.
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Guangzhou Maritime University
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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
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
    • 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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  • General Physics & Mathematics (AREA)
  • Locating Faults (AREA)

Abstract

The invention discloses a power distribution network line fault diagnosis system, which comprises: a plurality of groups of three-phase online power sensors and a master station; each group of three-phase online power sensors comprises an A-phase online power sensor, a B-phase online power sensor and a C-phase online power sensor, wherein the A-phase online power sensor is arranged in an A-phase power distribution network circuit; the B-phase online power sensor is arranged in a B-phase power distribution network line; the C-phase online power sensor is arranged in a C-phase power distribution network line; each group of three-phase online power sensors are deployed in a scattered and staggered manner; the B-phase online power sensor is in communication connection with the A-phase online power sensor and the C-phase online power sensor respectively; the B-phase online power sensor is in communication connection with the master station; the invention adopts a single-phase scattered and staggered deployment mode to configure the online power sensor in the power distribution network and analyze and judge the fault condition of the acquired current value, and provides a more accurate fault diagnosis method, thereby realizing accurate fault judgment and reducing equipment cost.

Description

Power distribution network line fault diagnosis system and method
Technical Field
The invention relates to the field of power grid fault diagnosis, in particular to a power distribution network line fault diagnosis system and method.
Background
The dependence on electric power energy sources is higher and higher no matter in enterprise production or daily life. Once power is cut off, huge loss is caused to the whole society. Therefore, in order to reduce the power failure time and improve the power supply reliability, the power grid company increases the investment in human resources and capital. Among the reasons for the power failure of the power system, the failure of the distribution line accounts for 80% or more. The main reason is that distribution lines have the characteristics of many points, wide range, various equipment types, various load changes, complex distribution network topology and the like compared with transmission lines.
Among them, technical research for fault diagnosis and location of distribution lines has been one of the main issues. The existing power distribution line has more fault diagnosis methods which are mainly divided into three types: 1) traditional relay protection is combined with manual line patrol; 2) a set of fault indicators; 3) a feeder automation terminal device.
The traditional relay protection and manual line patrol fault diagnosis method is as follows: through artifical line of patrolling, after distribution line relay protection action promptly, lead to joining in marriage net feeder export circuit breaker tripping operation, later inform electric power line patrolling personnel to lean on artifical attempt to seek trouble position along tripping operation distribution lines, its shortcoming mainly manifests: 1) the efficiency is low; 2) some latent faults are not easily discovered. Therefore, the power failure time is long in many times, and the factory production and the life quality of residents are affected. In recent years, with the continuous development of sensor technology and internet of things technology, advanced intelligent devices such as fault indicators and feeder automation terminals appear. The traditional fault indicator equipment has the advantages and the disadvantages of being prominent, and has the advantages of low cost and no need of power failure installation; the disadvantage is a slightly less accurate fault diagnosis. The feeder automation terminal equipment has the advantages of advanced sensor and relatively high fault judgment accuracy, but has high equipment cost and needs power failure in the installation process.
In summary, based on the wide territory, the complex terrain and the wide coverage area of the distribution line in China, the quantity of monitoring equipment for diagnosing and positioning the faults of the distribution network line is huge. Therefore, it is particularly urgent to find a fault diagnosis and positioning method suitable for distribution lines in China.
Disclosure of Invention
The invention provides a power distribution network line fault diagnosis system and method, which are used for configuring an online power sensor in a power distribution network in a single-phase scattered and staggered deployment mode and analyzing and judging the fault condition of the acquired current value so as to solve the technical problems of insufficient accuracy and high equipment cost of the traditional fault diagnosis, thereby providing a more accurate fault diagnosis method, further realizing accurate fault judgment and reducing the equipment cost.
In order to solve the above technical problem, an embodiment of the present invention provides a power distribution network line fault diagnosis system, including: a plurality of groups of three-phase online power sensors and a master station;
each group of three-phase online power sensors comprises an A-phase online power sensor, a B-phase online power sensor and a C-phase online power sensor, wherein the A-phase online power sensor is arranged in an A-phase power distribution network circuit; the phase B online power sensor is arranged in a phase B power distribution network line; the C-phase online power sensor is arranged in a C-phase power distribution network line; the A-phase online power sensor, the B-phase online power sensor and the C-phase online power sensor in each group of three-phase online power sensors are deployed in a scattered and staggered manner;
the phase B online power sensor is respectively in communication connection with the phase A online power sensor and the phase C online power sensor; the B-phase online power sensor is in communication connection with the master station;
the A-phase online power sensor, the B-phase online power sensor and the C-phase online power sensor are all used for collecting current values of respective single-phase lines and alarming current abnormal conditions caused by line short circuit conditions after collection points.
Preferably, the phase B online power sensor is wirelessly connected with the phase A online power sensor and the phase C online power sensor respectively; and the B-phase online power sensor is wirelessly connected with the master station.
The embodiment of the invention also provides a diagnosis method based on the power distribution network line fault diagnosis system, which comprises the following steps:
the method comprises the steps that A-phase current values of A-phase power distribution network lines are obtained through an A-phase online power sensor and are uploaded to a B-phase online power sensor;
acquiring a C-phase current value of a C-phase power distribution network line through a C-phase online power sensor and uploading the C-phase current value to a B-phase online power sensor;
acquiring a phase B current value of a phase B power distribution network line through a phase B online power sensor and receiving the phase A current value and the phase C current value;
adding the phase A current value, the phase B current value and the phase C current value to obtain a zero sequence current value;
the phase A current value, the phase B current value, the phase C current value and the zero sequence current value are sent to a main station through a phase B online power sensor;
and performing numerical analysis on the A-phase current value, the B-phase current value, the C-phase current value and the zero sequence current value through a main station, and performing fault judgment and positioning.
Preferably, the method for diagnosing the line fault of the power distribution network further comprises the following steps: presetting a preset phase current threshold and a preset zero sequence threshold of a single-phase line so as to judge and position the faults of the power distribution network line.
Preferably, the obtaining, by the phase a online power sensor, a phase a current value of the phase a power distribution network line and uploading the obtained phase a current value to the phase B online power sensor includes:
judging whether a data request signal sent by a B-phase online power sensor is received currently or not through the A-phase online power sensor, and if so, sending an A-phase current value of an A-phase power distribution network line to the B-phase online power sensor; if not, judging the current value of the current phase A and the threshold value of the preset phase current;
and when the A-phase current value is larger than a preset phase current threshold value, sending the A-phase current value of the A-phase power distribution network line to the B-phase online power sensor.
Preferably, the acquiring, by the C-phase online power sensor, a C-phase current value of the C-phase power distribution network line and uploading the C-phase current value to the B-phase online power sensor includes:
judging whether a data request signal sent by a B-phase online power sensor is received currently or not through a C-phase online power sensor, and if so, sending a C-phase current value of a C-phase power distribution network line to the B-phase online power sensor; if not, judging the current C-phase current value and the preset phase current threshold value;
and when the C-phase current value is larger than a preset phase current threshold value, sending the C-phase current value of the C-phase power distribution network line to the B-phase online power sensor.
Preferably, the acquiring, by a B-phase online power sensor, a B-phase current value of a B-phase power distribution network line and receiving the a-phase current value and the C-phase current value includes:
judging whether current data uploaded by the phase A online power sensor or the phase C online power sensor is currently received through the phase B online power sensor; if so, sending data request signals to other on-line power sensors of the group and collecting the data request signals; if not, judging the magnitude of the currently acquired B-phase current value of the B-phase power distribution network line and a preset phase current threshold value;
and when the phase B current value is larger than a preset phase current threshold value, sending a data request signal to other on-line power sensors of the group and collecting the data request signal.
As a preferred scheme, the performing numerical analysis on the a-phase current value, the B-phase current value, the C-phase current value and the zero-sequence current value through the master station to perform fault judgment and location includes:
judging whether current abnormal data sent by a B-phase online power sensor is received currently or not through a master station, and if so, judging the magnitude of a zero-sequence current value and a preset zero-sequence threshold value in the current abnormal data;
when the zero sequence current value is larger than a preset zero sequence threshold value, determining the current power distribution network line ground fault;
when the zero sequence current value is not greater than a preset zero sequence threshold value, determining the short circuit fault of the current power distribution network line;
and after the fault is determined, positioning the power distribution network line fault according to the A-phase current value, the B-phase current value and the C-phase current value.
As a preferred scheme, after the current power distribution network line ground fault is determined, the step of locating the power distribution network line fault includes:
comparing and judging according to the zero sequence current values uploaded by each group to obtain a primary position of a fault point between the two groups;
and carrying out transverse comparison according to the A, B, C three-phase currents uploaded by the two groups to obtain the specific position of the fault point.
As a preferred scheme, after determining the current short-circuit fault of the power distribution network line, the step of locating the power distribution network line fault includes:
comparing the A, B, C three-phase current uploaded by each group with a preset phase current threshold value, and determining a two-phase line exceeding the preset phase current threshold value so as to determine a primary position of a fault;
and judging the alarm condition of each online power sensor in the two-phase line to obtain the specific position of the fault point.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
according to the invention, the online power sensor is configured in the power distribution network in a single-phase scattered and staggered deployment mode, and the acquired current value is analyzed and judged for the fault condition, so that the technical problems of insufficient accuracy and high equipment cost of the traditional fault diagnosis are solved, and a more accurate fault diagnosis method is provided, thereby realizing accurate fault judgment and reducing equipment cost.
Drawings
FIG. 1: the invention is a schematic diagram of a distribution network line fault diagnosis system deployment structure;
FIG. 2: the data processing flow chart of the phase B online power sensor in the embodiment of the invention is shown;
FIG. 3: a flow chart of the data processing of the master station in the embodiment of the invention;
FIG. 4: the line ground fault positioning schematic diagram in the embodiment of the invention;
FIG. 5: the invention provides a line short-circuit fault location diagram in an embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of 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 invention.
Referring to fig. 1, a preferred embodiment of the present invention provides a power distribution network line fault diagnosis system, including: a plurality of groups of three-phase online power sensors and a master station;
each group of three-phase online power sensors comprises an A-phase online power sensor, a B-phase online power sensor and a C-phase online power sensor, wherein the A-phase online power sensor is arranged in an A-phase power distribution network circuit; the phase B online power sensor is arranged in a phase B power distribution network line; the C-phase online power sensor is arranged in a C-phase power distribution network line; the A-phase online power sensor, the B-phase online power sensor and the C-phase online power sensor in each group of three-phase online power sensors are deployed in a scattered and staggered manner;
the phase B online power sensor is respectively in communication connection with the phase A online power sensor and the phase C online power sensor; the B-phase online power sensor is in communication connection with the master station;
the A-phase online power sensor, the B-phase online power sensor and the C-phase online power sensor are all used for collecting current values of respective single-phase lines and alarming current abnormal conditions caused by line short circuit conditions after collection points.
In this embodiment, the phase B online power sensor is wirelessly connected to the phase a online power sensor and the phase C online power sensor, respectively; and the B-phase online power sensor is wirelessly connected with the master station.
Specifically, the power distribution network line fault diagnosis system provided by the invention is mainly realized based on four devices:
(1) phase a online power sensor 1: is responsible for collecting A phase circuit current data It1；
(2) Phase C online power sensor 2: is responsible for collecting C phase circuit current data It2；
(3) Phase B online power sensor 3: is responsible for collecting B phase circuit current data It3(ii) a Is responsible for collecting the current data I of the phase A and the phase C on-line power sensor through short-range wireless communicationt1And It2And adding A, B, C three-phase current data to form zero-sequence current It0And is responsible for communicating with sensors 1 and 2, collecting data collected by sensors 1 and 2, and converting A, B, C three-phase line current dataIt1、It2、It3And zero sequence current It0(zero sequence current can pass through I)t1、It2、It3Additive synthesis) to the primary station 4. In addition, it is also responsible for keeping A, B, C the synchronous sampling of the three-phase online power sensor;
(4) and (4) the master station: and the system is responsible for analyzing data collected by each group of online power sensors 3 and giving out fault judgment and positioning results.
The invention provides a novel on-line power sensor configuration and deployment scheme, and provides a matched power distribution network line fault diagnosis and positioning method based on the provided configuration and deployment scheme. The invention can meet the requirements of a distribution line fault diagnosis and positioning system, can greatly reduce the investment cost of system equipment, improves the economic benefit ratio of a power grid company, and is more suitable for the development current situation and the future development trend of the power system in China.
The embodiment of the invention also provides a diagnosis method based on the power distribution network line fault diagnosis system, which comprises the following steps:
s1, the phase A current value of the phase A power distribution network line is acquired through the phase A online power sensor and is uploaded to the phase B online power sensor; in this embodiment, the method for diagnosing a line fault of a power distribution network further includes: presetting a preset phase current threshold and a preset zero sequence threshold of a single-phase line so as to judge and position the faults of the power distribution network line. Wherein, ITPIs a preset phase current threshold. In this embodiment, the step S1 includes:
s11, judging whether a data request signal sent by a B-phase online power sensor is received currently through the A-phase online power sensor, and if so, sending an A-phase current value of an A-phase power distribution network line to the B-phase online power sensor; if not, judging the current value of the current phase A and the threshold value of the preset phase current;
and S12, when the A-phase current value is larger than the preset phase current threshold value, sending the A-phase current value of the A-phase power distribution network line to the B-phase online power sensor.
S2, acquiring a C-phase current value of a C-phase power distribution network line through the C-phase online power sensor, and uploading the C-phase current value to the B-phase online power sensor; in this embodiment, the step S2 includes:
s21, judging whether a data request signal sent by a B-phase online power sensor is received currently through the C-phase online power sensor, and if so, sending a C-phase current value of a C-phase power distribution network line to the B-phase online power sensor; if not, judging the current C-phase current value and the preset phase current threshold value;
and S22, when the C-phase current value is larger than the preset phase current threshold value, sending the C-phase current value of the C-phase power distribution network line to the B-phase online power sensor.
S3, acquiring a phase B current value of a phase B power distribution network line through a phase B online power sensor, and receiving the phase A current value and the phase C current value; as shown in fig. 2, in the present embodiment, the step S3 includes:
s31, judging whether current data uploaded by the phase A online power sensor or the phase C online power sensor is currently received through the phase B online power sensor; if so, sending data request signals to other on-line power sensors of the group and collecting the data request signals; if not, judging the magnitude of the currently acquired B-phase current value of the B-phase power distribution network line and a preset phase current threshold value;
and S32, when the phase-B current value is larger than the preset phase current threshold value, sending data request signals to other on-line power sensors in the group and collecting the data request signals.
S4, adding the phase A current value, the phase B current value and the phase C current value to obtain a zero-sequence current value;
s5, sending the A-phase current value, the B-phase current value, the C-phase current value and the zero-sequence current value to a main station through a B-phase online power sensor;
and S6, performing numerical analysis on the A-phase current value, the B-phase current value, the C-phase current value and the zero sequence current value through the main station, and performing fault judgment and positioning. As shown in fig. 3, in the present embodiment, the step S6 includes:
s61, judging whether current abnormal data sent by the B-phase online power sensor is received or not through the main station, and if so, judging the magnitude of a zero sequence current value and a preset zero sequence threshold value in the current abnormal data;
s62, when the zero sequence current value is larger than a preset zero sequence threshold value, determining the current power distribution network line ground fault;
s63, when the zero sequence current value is not greater than a preset zero sequence threshold value, determining the short circuit fault of the current power distribution network circuit;
and S64, after the fault is determined, positioning the power distribution network line fault according to the A-phase current value, the B-phase current value and the C-phase current value.
Wherein, It0_TIs a preset zero sequence threshold value.
In this embodiment, after determining the current power distribution network line ground fault, the step of locating the power distribution network line fault includes: comparing and judging according to the zero sequence current values uploaded by each group to obtain a primary position of a fault point between the two groups; and carrying out transverse comparison according to the A, B, C three-phase currents uploaded by the two groups to obtain the specific position of the fault point.
Specifically, the single-phase earth fault judgment and positioning method is described as follows: as shown in fig. 4, a phase a single-phase earth fault occurs at the position, and zero-sequence current I synthesized by the phase B online current sensors at the position #1 and the position #2t0_1And It0_2All exceed It0_TAnd the #3 position is located after the failure point, it can be first judged that the failure point is between the #2 position and the #3 position. In order to judge the position of the fault more accurately, the A, B, C three-phase currents at the positions of #2 and #3 are transversely compared (namely #2A phase and #3A phase, B, C phase and the like), so that the front and the back of the A-phase current at which the single phase is grounded are different, and the B, C-phase current is not different, so that the fault point between the lines at the positions of #2 and #3A phase can be judged.
In this embodiment, after determining the current short-circuit fault of the power distribution network, the step of locating the power distribution network fault includes: comparing the A, B, C three-phase current uploaded by each group with a preset phase current threshold value, and determining a two-phase line exceeding the preset phase current threshold value so as to determine a primary position of a fault; and judging the alarm condition of each online power sensor in the two-phase line to obtain the specific position of the fault point.
Specifically, the interphase short-circuit fault judging and positioning method is explained as follows: after A, B two-phase short circuit fault occurs at the position shown in FIG. 5, I collected by the B-phase online power sensor at the #1 positiont3Will exceed ITP(preset short-circuit fault current threshold, same below), #2 position I collected by phase A on-line power sensort1Will also exceed ITP(ii) a However, the sensor with the C-phase line does not have It2Over ITPThe phenomenon of (2) occurs. Therefore, the master station 4 can determine that the AB two-phase short circuit has occurred after receiving the information. In addition, the short-circuit alarm cannot be carried out (because the short-circuit alarm is carried out after the fault point) when the B-phase online power sensor at the #2 position collects current, and the A-phase online power sensor at the #2 position and the B-phase online power sensor at the #1 position carry out alarm. Therefore, it can be determined that the fault location is between the a-phase and B-phase sensors at the #2 location, based on the front-rear positional relationship of the single-phase fault-drop deployment. Thus, it can be seen that the fault location can be accurately diagnosed and judged although the equipment investment is reduced.
The invention aims to provide a novel power distribution network line fault diagnosis and positioning method based on uninterrupted power installation. The method has the main characteristics that the investment quantity of equipment is reduced and the cost of the existing diagnosis system is greatly saved on the premise of effectively guaranteeing the functions of fault diagnosis and positioning.
The invention has the advantages that:
(1) the mode of the 3A, B, C three-phase online power sensors provided by the invention is different from the traditional deployment mode in that the 3 online power sensors are not deployed at the same position, but are deployed in a single-phase, dispersed and staggered manner, so that the aim of greatly reducing the input cost is fulfilled under the condition of meeting the monitoring range of the same distribution line. As shown in fig. 1, by the deployment method provided by the invention, only 3 online power sensors are needed to complete deployment, so that the equipment investment cost can be greatly reduced;
(2) the invention not only provides the novel equipment deployment scheme, but also provides a matched fault diagnosis and positioning method. The equipment investment is reduced, and the reliability of fault diagnosis and positioning of the power distribution network line is guaranteed.
The above-mentioned embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, and it should be understood that the above-mentioned embodiments are only examples of the present invention and are not intended to limit the scope of the present invention. It should be understood that any modifications, equivalents, improvements and the like, which come within the spirit and principle of the invention, may occur to those skilled in the art and are intended to be included within the scope of the invention.

Claims (8)

1. A power distribution network line fault diagnostic system, comprising: a plurality of groups of three-phase online power sensors and a master station;
each group of three-phase online power sensors comprises an A-phase online power sensor, a B-phase online power sensor and a C-phase online power sensor, wherein the A-phase online power sensor is arranged in an A-phase power distribution network circuit; the phase B online power sensor is arranged in a phase B power distribution network line; the C-phase online power sensor is arranged in a C-phase power distribution network line; the A-phase online power sensor, the B-phase online power sensor and the C-phase online power sensor in each group of three-phase online power sensors are deployed in a scattered and staggered manner;
the phase B online power sensor is respectively in communication connection with the phase A online power sensor and the phase C online power sensor; the B-phase online power sensor is in communication connection with the master station;
the A-phase online power sensor, the B-phase online power sensor and the C-phase online power sensor are all used for acquiring current values of respective single-phase lines and alarming current abnormal conditions caused by line short circuit conditions occurring behind acquisition points;
the master station is used for:
judging whether current abnormal data sent by a B-phase online power sensor is received or not at present, and if so, judging the magnitude of a zero-sequence current value and a preset zero-sequence threshold value in the current abnormal data;
when the zero sequence current value is larger than a preset zero sequence threshold value, determining the current power distribution network line ground fault;
when the zero sequence current value is not greater than a preset zero sequence threshold value, determining the short circuit fault of the current power distribution network line;
after the fault is determined, comparing the A, B, C three-phase current uploaded by each group with a preset phase current threshold value, and determining a two-phase line exceeding the preset phase current threshold value so as to determine a primary position of the fault;
and judging the alarm condition of each online power sensor in the two-phase line to obtain the specific position of the fault point.
2. The power distribution network line fault diagnosis system of claim 1, wherein the phase B online power sensor is wirelessly connected with the phase a online power sensor and the phase C online power sensor, respectively; and the B-phase online power sensor is wirelessly connected with the master station.
3. A method for diagnosing a fault diagnosis system for a distribution network line according to any one of claims 1 and 2, comprising:
the method comprises the steps that A-phase current values of A-phase power distribution network lines are obtained through an A-phase online power sensor and are uploaded to a B-phase online power sensor;
acquiring a C-phase current value of a C-phase power distribution network line through a C-phase online power sensor and uploading the C-phase current value to a B-phase online power sensor;
acquiring a phase B current value of a phase B power distribution network line through a phase B online power sensor and receiving the phase A current value and the phase C current value;
adding the phase A current value, the phase B current value and the phase C current value to obtain a zero sequence current value;
the phase A current value, the phase B current value, the phase C current value and the zero sequence current value are sent to a main station through a phase B online power sensor;
judging whether current abnormal data sent by a B-phase online power sensor is received currently or not through a master station, and if so, judging the magnitude of a zero-sequence current value and a preset zero-sequence threshold value in the current abnormal data;
when the zero sequence current value is larger than a preset zero sequence threshold value, determining the current power distribution network line ground fault;
when the zero sequence current value is not greater than a preset zero sequence threshold value, determining the short circuit fault of the current power distribution network line;
after the fault is determined, positioning the power distribution network line fault according to the A-phase current value, the B-phase current value and the C-phase current value;
comparing the A, B, C three-phase current uploaded by each group with a preset phase current threshold value, and determining a two-phase line exceeding the preset phase current threshold value so as to determine a primary position of a fault;
and judging the alarm condition of each online power sensor in the two-phase line to obtain the specific position of the fault point.
4. The method for diagnosing a power distribution network line fault diagnostic system of claim 3, further comprising: presetting a preset phase current threshold and a preset zero sequence threshold of a single-phase line so as to judge and position the faults of the power distribution network line.
5. The method for diagnosing the system for diagnosing faults of the power distribution network lines as claimed in claim 4, wherein the step of obtaining the phase A current value of the phase A power distribution network line through the phase A online power sensor and uploading the phase A current value to the phase B online power sensor comprises the steps of:
judging whether a data request signal sent by a B-phase online power sensor is received currently or not through the A-phase online power sensor, and if so, sending an A-phase current value of an A-phase power distribution network line to the B-phase online power sensor; if not, judging the current value of the current phase A and the threshold value of the preset phase current;
and when the A-phase current value is larger than a preset phase current threshold value, sending the A-phase current value of the A-phase power distribution network line to the B-phase online power sensor.
6. The method for diagnosing the power distribution network line fault diagnosis system of claim 4, wherein the step of obtaining the C-phase current value of the C-phase power distribution network line through the C-phase online power sensor and uploading the C-phase current value to the B-phase online power sensor comprises the steps of:
judging whether a data request signal sent by a B-phase online power sensor is received currently or not through a C-phase online power sensor, and if so, sending a C-phase current value of a C-phase power distribution network line to the B-phase online power sensor; if not, judging the current C-phase current value and the preset phase current threshold value;
and when the C-phase current value is larger than a preset phase current threshold value, sending the C-phase current value of the C-phase power distribution network line to the B-phase online power sensor.
7. The method for diagnosing the power distribution network line fault diagnosis system according to claim 4, wherein the acquiring, by the B-phase online power sensor, the B-phase current value of the B-phase power distribution network line and receiving the a-phase current value and the C-phase current value includes:
judging whether current data uploaded by the phase A online power sensor or the phase C online power sensor is currently received through the phase B online power sensor; if so, sending data request signals to other on-line power sensors of the group and collecting the data request signals; if not, judging the magnitude of the currently acquired B-phase current value of the B-phase power distribution network line and a preset phase current threshold value;
and when the phase B current value is larger than a preset phase current threshold value, sending a data request signal to other on-line power sensors of the group and collecting the data request signal.
8. The method for diagnosing a distribution network line fault diagnosis system of claim 7, wherein the step of locating the distribution network line fault after determining the current distribution network line ground fault comprises:
comparing and judging according to the zero sequence current values uploaded by each group to obtain a primary position of a fault point between the two groups;
and carrying out transverse comparison according to the A, B, C three-phase currents uploaded by the two groups to obtain the specific position of the fault point.
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