CN113030634A - Ground fault positioning method based on network unit host - Google Patents
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- 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
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- 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
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Abstract
The embodiment of the application provides a ground fault positioning method based on a network unit host, which comprises the steps of obtaining zero sequence voltage, zero sequence current amplitude and phase difference on a terminal; selecting the phase difference values of a plurality of calculation periods to be arithmetically averaged, and uploading the arithmetically averaged value of the obtained phase difference values to a network unit host; and the network unit host judges whether the single-phase earth fault occurs or not based on whether the difference between the phase angle difference data and the phase angle difference data uploaded by other hosts exceeds a fixed value or not for the received arithmetic mean value of the phase angle difference values uploaded by the plurality of terminals. For the whole power distribution network, the system is used as a distributed operation subsystem to independently operate and manage the power distribution network automation in the system, can quickly process faults occurring in the local area, and does not depend on the whole power distribution network. For the inside of the system, the network communication time delay is much smaller, and by means of the intelligent comprehensive protection system, the collection and unified processing of the terminal acquisition data can be realized, so that the accurate judgment of the single-phase earth fault is realized.
Description
Technical Field
The application belongs to the field of power maintenance, and particularly relates to a ground fault positioning method based on a network unit host.
Background
At present, the power distribution network in urban areas of China mostly adopts the form of underground cables or overhead insulated conductors, and the probability of short circuit and single-phase earth fault of lines is relatively low. In rural areas and mountain areas, due to economic considerations, the line is still paved mainly by using an overhead bare conductor mode, at ordinary times, due to various natural or artificial reasons and the like, single-phase grounding accidents are more, particularly in mountain areas, under the weather conditions of wind and snow in winter or thunderstorm in summer, the single-phase grounding condition of the line is easy to happen in succession, partial single-phase grounding can be further deteriorated to be a short-circuit fault, the severe weather conditions are not suitable for outgoing inspection and maintenance when the fault happens, and the maintenance can be started only by stopping power of the whole line and waiting for the weather to be changed.
For single-phase earth faults, because the power distribution network line in China adopts a low-current earth operation mode, the operation condition of the power distribution network system is complex and changeable, the electrical characteristic quantity of the fault is not obvious when the single-phase earth fault occurs in the system, the judgment of the fault line and the position is difficult, and the single-phase earth fault of the power distribution network of the low-current earth system becomes one of the difficult problems which puzzle the operation of the power distribution network in China for many years. If a reliable single-phase earth fault judgment method can be found and applied to a line switch, the switch close to a fault section on a line can make an accurate response when the system has a single-phase earth fault, and the power supply reliability of a power distribution network can be greatly improved.
Terminals such as intelligent switches installed on lines can only collect and process the electrical information quantity of the installation positions of the terminals, and the terminals often only can rely on the collected information when fault judgment is carried out. If the information collected by other terminals at different positions can be obtained, the judgment can be more accurate through a comparison mode, the data of a plurality of terminals are concentrated to one position, and a small network terminal mode of a network unit host-a power distribution station terminal can be adopted. In the traditional centralized feeder automation, a plurality of power stations are used as an automatic whole to operate in a unified and coordinated mode, the number of terminals to be managed by a main station is large, network and terminal information involved in a fault to be processed is complicated, the processing rule is complex and is easy to make mistakes, and the adjustment rule and parameter difficulty is large after the topology of the system structure is changed. And the system highly depends on a perfect communication system, the control requirement cannot be met when the communication time delay is too high, and the whole system is paralyzed when a problem occurs in a communication key node.
Disclosure of Invention
The embodiment of the application provides a method for positioning the ground fault based on the network unit host, which greatly shortens the power failure time of a user, reduces the loss caused by power failure and makes up the defects of a low-current grounding operation mode.
Specifically, the method for positioning a ground fault based on a network unit host provided in the embodiment of the present application includes:
acquiring zero-sequence voltage and zero-sequence current on an outgoing line of a terminal;
obtaining the amplitude and phase difference of zero-sequence voltage and zero-sequence current on a terminal;
selecting the phase difference values of a plurality of calculation periods to be arithmetically averaged, and uploading the arithmetically averaged value of the obtained phase difference values to a network unit host;
and the network unit host judges whether the single-phase earth fault occurs or not based on whether the difference between the phase angle difference data and the phase angle difference data uploaded by other hosts exceeds a fixed value or not for the received arithmetic mean value of the phase angle difference values uploaded by the plurality of terminals.
Optionally, the obtaining of the zero-sequence voltage, the zero-sequence current amplitude and the phase difference at the terminal includes:
if the zero sequence voltage of the system is monitored to be increased to exceed U0setJudging whether the zero sequence current amplitude value exceeds the design value I0set；
When the zero sequence current amplitude value is checked whether to exceed the design value I0setAnd then, calculating the amplitude and the phase difference of the stabilized zero sequence voltage and the stabilized zero sequence current.
Optionally, the determining, by the network unit host, whether a single-phase ground fault occurs based on whether a difference between the phase angle difference data and the phase angle difference data uploaded by the other hosts exceeds a predetermined value for the arithmetic average of the received phase difference values uploaded by the multiple terminals includes:
for the phase difference value data uploaded by all bus outgoing line terminals, the network unit host firstly selects terminal data installed at the head end of the outgoing line according to the installation position of the terminal for comparison, and if the difference between the phase angle difference data uploaded by a certain terminal host and the phase angle difference data uploaded by other hosts exceeds a fixed value delta thetasetAnd judging that the outgoing line has single-phase earth fault.
Optionally, the determining, by the network unit host, whether a single-phase ground fault occurs based on whether a difference between the phase angle difference data and the phase angle difference data uploaded by other hosts exceeds a predetermined value with respect to the arithmetic mean of the received phase angle differences uploaded by the multiple terminals further includes:
comparing the data uploaded by all the terminals on the failed outgoing line, and if the difference of the uploaded phase angle data of the two adjacent terminals exceeds delta thetasetAnd judging that the single-phase earth fault occurs between the two terminals, and determining the line section with the fault.
Optionally, the method further includes:
calculating the difference value of the starting phase angle of the terminal except that the zero sequence voltage reaches a set value U when the starting condition is met0setZero sequence current also reaches the set value I0set. Wherein U is0set＝500～2000，I0set＝2～5。
Optionally, the method further includes:
and using the arithmetic mean value of the phase angle difference values of the zero-sequence voltage and the zero-sequence current in a plurality of power frequency periods after the fault occurs for diagnosis. The calculation of the arithmetic mean value is that the phase angle difference value of a single period is calculated firstly, then the arithmetic mean calculation is carried out on the difference values calculated in a plurality of periods, and the calculation sequence cannot be reversed.
Optionally, the method further includes:
and respectively judging the interval positions of the fault outgoing line and the fault on the outgoing line, wherein the adopted data sets are different, the former is the data of all received first terminals of the outgoing line, and the latter is the data of all the terminals on one outgoing line. The flow execution sequence is to judge the line first and then judge the interval.
Optionally, the method further includes:
the constant value Delta thetasetThe value is 10 to 20 degrees.
Has the advantages that:
the advantages of the network unit host judgment and the intelligent terminal acquisition are combined, the characteristic that the zero sequence current direction of a fault line in a neutral point ungrounded system is opposite to that of a non-fault line, the zero sequence current direction of the fault line in the neutral point arc suppression line grounded system is influenced by the resistive component of the arc suppression line, and the zero sequence current direction of the fault line has a certain included angle difference with the non-fault line is utilized, single-phase grounding fault judgment is carried out, the accuracy is high, and the fault area can be judged quickly.
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In order to more clearly illustrate the technical solutions of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic flowchart of a method for positioning a ground fault based on a network unit host according to an embodiment of the present disclosure.
Detailed Description
To make the structure and advantages of the present application clearer, the structure of the present application will be further described with reference to the accompanying drawings.
In order to overcome the defects, according to the topological characteristics of a power distribution network system, the power distribution network is divided into a plurality of small network units, such as two substation circuits, namely a hand-pull loop circuit, the middle of the two substation circuits is connected by a plurality of switching stations in a connected mode, and the two substation circuits are disconnected at the connecting switches in an open-loop operation state during normal operation. In the small system, a set of intelligent terminals matched with each switch, a communication manager matched with each switching station, and a distributed distribution network intelligent integrated protection system formed by a network unit host deployed in one switching station, matched optical fibers and a wireless communication system are established to automatically manage and operate the fault in the small system. The scheme is a small subsystem which runs in a distributed mode for the whole power distribution network, the automation of the power distribution network in the subsystem is managed in an independent running mode, faults occurring in the local area can be processed quickly, the whole power distribution network is not depended on, and the distributed feeder automation system has the advantage of low dependence on communication. The small system is a centralized automatic system, network communication time delay is much smaller, and the centralized automatic system has the advantages of rapid fault processing and less switching times. By means of the intelligent comprehensive protection system, the collected data of the terminal can be uniformly processed, and then the accurate judgment of the single-phase earth fault is realized.
Specifically, as shown in fig. 1, the method for locating a ground fault based on a network unit host provided in the embodiment of the present application includes:
11. acquiring zero-sequence voltage and zero-sequence current on an outgoing line of a terminal;
12. obtaining the amplitude and phase difference of zero-sequence voltage and zero-sequence current on a terminal;
13. selecting the phase difference values of a plurality of calculation periods to be arithmetically averaged, and uploading the arithmetically averaged value of the obtained phase difference values to a network unit host;
14. and the network unit host judges whether the single-phase earth fault occurs or not based on whether the difference between the phase angle difference data and the phase angle difference data uploaded by other hosts exceeds a fixed value or not for the received arithmetic mean value of the phase angle difference values uploaded by the plurality of terminals.
In implementation, the data processing specific implementation software flow of the terminal is as follows:
the single-phase earth fault line selection diagnostic equipment monitors zero sequence voltage and zero sequence current at an installation position at any time, and starts a data analysis process when detecting that the zero sequence voltage value is greater than U0set and the zero sequence current value is greater than I0 set.
And secondly, calculating the phase angle difference value of the zero-sequence voltage and the zero-sequence current in a single power frequency period in a steady state after the fault.
And thirdly, calculating the average value of the phase angle difference values of the zero-sequence voltage and the current in a plurality of power frequency periods after the fault.
And fourthly, uploading the difference average value to a network unit host.
The data processing specific implementation software flow of the network center host computer is as follows:
1) and obtaining the phase angle difference data uploaded by all the terminals.
2) And analyzing the data of all the terminals at the head end of the outgoing line, wherein if the difference value between the data uploaded by one terminal and the data uploaded by other terminals exceeds a set value. The single-phase earth fault occurs on the outgoing line of the terminal.
3) If a line with a fault is found in the previous step, analyzing and processing the data uploaded by all the terminals on the line, if the difference between the data uploaded by two adjacent terminals exceeds a set value, indicating that the fault occurs between the terminals, otherwise, indicating that the fault occurs at one of the last terminals, namely the tail end of the line.
Optionally, the obtaining of the zero-sequence voltage, the zero-sequence current amplitude and the phase difference at the terminal includes:
if the zero sequence voltage of the system is monitored to be increased to exceed U0setJudging whether the zero sequence current amplitude value exceeds the design value I0set；
When the zero sequence current amplitude value is checked whether to exceed the design value I0setAnd then, calculating the amplitude and the phase difference of the stabilized zero sequence voltage and the stabilized zero sequence current.
The invention adopts the mode of combining the network unit host and the terminal of the power distribution station, the terminal collects the zero sequence voltage and the zero sequence current on the outgoing line of the power distribution station, and when the zero sequence voltage of the system is monitored to be increased to exceed U0setChecking whether the zero sequence current amplitude exceeds the design value I0setAnd if so, starting to calculate the amplitude and the phase difference of the stabilized zero-sequence voltage and zero-sequence current, and taking the phase difference values of a plurality of calculation periods as arithmetic mean. And uploading the obtained phase difference value to a network unit host, and carrying out comparative analysis processing on the received data uploaded by the plurality of terminals by the network unit host. The method comprises the following two steps: 1) for the phase difference value data uploaded by all bus outgoing line terminals, the network unit host firstly selects terminal data installed at the head end of the outgoing line according to the installation position of the terminal for comparison, and if the difference between the phase angle difference data uploaded by a certain terminal host and the phase angle difference data uploaded by other hosts exceeds a fixed value delta thetasetAnd judging that the outgoing line has single-phase earth fault. 2) Comparing the data uploaded by all the terminals on the failed outgoing line, and if the difference of the uploaded phase angle data of the two adjacent terminals exceeds delta thetasetThen, it is determined that a single-phase earth fault has occurred between the two terminals, thereby determining the line in which the fault has occurredAn interval.
Optionally, the determining, by the network unit host, whether a single-phase ground fault occurs based on whether a difference between the phase angle difference data and the phase angle difference data uploaded by the other hosts exceeds a predetermined value for the arithmetic average of the received phase difference values uploaded by the multiple terminals includes:
for the phase difference value data uploaded by all bus outgoing line terminals, the network unit host firstly selects terminal data installed at the head end of the outgoing line according to the installation position of the terminal for comparison, and if the difference between the phase angle difference data uploaded by a certain terminal host and the phase angle difference data uploaded by other hosts exceeds a fixed value delta thetasetIf yes, judging that the outgoing line has single-phase earth fault; or
Comparing the data uploaded by all the terminals on the failed outgoing line, and if the difference of the uploaded phase angle data of the two adjacent terminals exceeds delta thetasetAnd judging that the single-phase earth fault occurs between the two terminals, and determining the line section with the fault.
In the implementation, the equipment installed on the line or the distribution station collects the zero sequence current and the zero sequence voltage at the installation position and continuously calculates the effective value U of the zero sequence current and the zero sequence voltage0RMSAnd I0RMS. When U is detected0RMSAnd I0RMSExceeds a set value U0setAnd I0SetThen (c) is performed.
I.e. U0RMS>U0setAnd I0RMS>I0setWhen the temperature of the water is higher than the set temperature,
and performing DFT (fast Fourier transform) on the zero-sequence current and the zero-sequence voltage after the fault, and calculating to obtain a zero-sequence voltage and zero-sequence current phase angle of a power frequency cycle as shown in the following formula.
θU0i＝DFT(U0(i))，θI0i＝DFT(I0(i))。
Calculating the difference value delta theta between zero-sequence current and zero-sequence voltage in a power frequency periodi，Δθi＝θU0i-θI0i。
And calculating an arithmetic mean value delta theta of the difference value of the zero-sequence voltage and the zero-sequence current obtained by calculating a plurality of power frequency periods.
And the terminal uploads the calculated arithmetic mean value of the phase angle difference to a host computer of the network unit.
The network unit host computer receives all the zero sequence phase angle difference values sent by the managed terminal and records the difference values as delta thetaTiRecording the phase angle difference value of each outgoing line sent back by the first terminal as delta thetaT1iI is 1 to m, and if there is i, j satisfies
|ΔθT1j-ΔθT1i|>ΔθsetAnd if i is 1 to m and i is not equal to j, the j-th outgoing line is a line with a single-phase ground fault.
If the fault outgoing line is judged in the previous step, the next fault interval judgment is carried out, and the network unit host sequentially records all the terminals on the fault outgoing line j judged in the previous step as delta thetaTjiI is 1 to p, and if there is i, k satisfies | Δ θ |Tjk-ΔθTj(k+1)|>ΔθsetThen, it indicates that a fault occurs between the k-th and k + 1-th terminals, and if no i-k satisfies the above condition, it indicates that a fault occurs at the end of the line.
Optionally, the method further includes:
calculating the difference value of the starting phase angle of the terminal except that the zero sequence voltage reaches a set value U when the starting condition is met0setZero sequence current also reaches the set value I0set. Wherein U is0set＝500～2000，I0set＝2～5。
Optionally, the method further includes:
and using the arithmetic mean value of the phase angle difference values of the zero-sequence voltage and the zero-sequence current in a plurality of power frequency periods after the fault occurs for diagnosis. The calculation of the arithmetic mean value is that the phase angle difference value of a single period is calculated firstly, then the arithmetic mean calculation is carried out on the difference values calculated in a plurality of periods, and the calculation sequence cannot be reversed.
Optionally, the method further includes:
and respectively judging the interval positions of the fault outgoing line and the fault on the outgoing line, wherein the adopted data sets are different, the former is the data of all received first terminals of the outgoing line, and the latter is the data of all the terminals on one outgoing line. The flow execution sequence is to judge the line first and then judge the interval.
Optionally, the method further includes:
the constant value Delta thetasetThe value is 10 to 20 degrees.
The technology can quickly realize fault location, not only can greatly improve the automation degree of the power distribution network, but also can greatly shorten the power failure time of a user, reduce the loss caused by power failure, make up for the defects of a low-current grounding operation mode, and have good social and economic benefits.
The invention utilizes the characteristic that the included angle between the zero sequence voltage and the zero sequence current of the outgoing line of the single-phase earth fault of the small current earth system is different, and uploads the zero sequence voltage current phase angle difference acquired by intelligent terminals installed at different positions to a network unit host computer for analysis and processing, thereby determining the fault outgoing line and the fault interval.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (8)
1. A method for positioning a ground fault based on a network unit host, the method comprising:
acquiring zero-sequence voltage and zero-sequence current on an outgoing line of a terminal;
obtaining the amplitude and phase difference of zero-sequence voltage and zero-sequence current on a terminal;
selecting the phase difference values of a plurality of calculation periods to be arithmetically averaged, and uploading the arithmetically averaged value of the obtained phase difference values to a network unit host;
and the network unit host judges whether the single-phase earth fault occurs or not based on whether the difference between the phase angle difference data and the phase angle difference data uploaded by other hosts exceeds a fixed value or not for the received arithmetic mean value of the phase angle difference values uploaded by the plurality of terminals.
2. The method of claim 1, wherein obtaining the magnitude and phase difference between the zero-sequence voltage and the zero-sequence current at the terminal comprises:
if the zero sequence voltage of the system is monitored to be increased to exceed U0setJudging whether the zero sequence current amplitude value exceeds the design value I0set；
When the zero sequence current amplitude value is checked whether to exceed the design value I0setAnd then, calculating the amplitude and the phase difference of the stabilized zero sequence voltage and the stabilized zero sequence current.
3. The method as claimed in claim 1, wherein the method for determining whether a single-phase ground fault occurs based on whether the difference between the phase angle difference data and the phase angle difference data uploaded by other hosts exceeds a predetermined value for the arithmetic mean of the received phase angle difference values uploaded by the plurality of terminals by the network unit host comprises:
for the phase difference value data uploaded by all bus outgoing line terminals, the network unit host firstly selects terminal data installed at the head end of the outgoing line according to the installation position of the terminal for comparison, and if the difference between the phase angle difference data uploaded by a certain terminal host and the phase angle difference data uploaded by other hosts exceeds a fixed value delta thetasetAnd judging that the outgoing line has single-phase earth fault.
4. The method as claimed in claim 1 or 3, wherein the method for locating a ground fault based on a network unit host determines whether a single-phase ground fault occurs based on whether the difference between the phase angle difference data and the phase angle difference data uploaded by other hosts exceeds a predetermined value for the arithmetic mean of the phase angle difference values uploaded by the plurality of terminals received by the network unit host, further comprising:
comparing the data uploaded by all the terminals on the failed outgoing line, and if the difference of the uploaded phase angle data of the two adjacent terminals exceeds delta thetasetIf the single-phase grounding occurs between the two terminals, it is determined that the single-phase grounding occurs between the two terminalsAnd determining a fault line section.
5. The network element host based ground fault location method of claim 1, further comprising:
calculating the difference value of the starting phase angle of the terminal except that the zero sequence voltage reaches a set value U when the starting condition is met0setZero sequence current also reaches the set value I0set(ii) a Wherein U is0set＝500～2000，I0set＝2～5。
6. The method of claim 1, further comprising:
using the arithmetic mean value of the phase angle difference values of the zero-sequence voltage and the zero-sequence current in a plurality of power frequency periods after the fault occurs for diagnosis;
the calculation of the arithmetic mean value is that the phase angle difference value of a single period is calculated firstly, then the arithmetic mean calculation is carried out on the difference values calculated in a plurality of periods, and the calculation sequence cannot be reversed.
7. The method of claim 1, further comprising:
and respectively judging the interval positions of the fault outgoing line and the fault on the outgoing line.
8. The method of claim 1, further comprising:
the constant value Delta thetasetThe value is 10 to 20 degrees.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113567811A (en) * | 2021-08-13 | 2021-10-29 | 广东电网有限责任公司 | Distribution line single-phase fault detection method and related device |
| CN113702692A (en) * | 2021-07-20 | 2021-11-26 | 中国电力科学研究院有限公司 | Method and device for synchronously monitoring current data of power distribution Internet of things |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI20031546A0 (en) * | 2003-10-22 | 2003-10-22 | Abb Oy | Method and apparatus for identifying an intermittent earth fault in an electrical distribution network |
| CN103728532A (en) * | 2013-12-26 | 2014-04-16 | 长园深瑞继保自动化有限公司 | Power distribution network single-phase grounding fault judging and locating method |
| CN104101812A (en) * | 2013-04-09 | 2014-10-15 | 北京映翰通网络技术股份有限公司 | Single-phase grounding fault detection and positioning method and system for low-current grounding power distribution network |
| US20140309953A1 (en) * | 2013-04-10 | 2014-10-16 | Mitsubishi Electric Research Laboratories, Inc. | Method for Locating of Single-Phase-to-Ground Faults of Ungrounded Power Distribution Systems |
| CN208369312U (en) * | 2018-05-21 | 2019-01-11 | 浙江中新电力发展集团有限公司萧山科技分公司 | The distributed DTU terminal of accurate detection singlephase earth fault |
| WO2019075671A1 (en) * | 2017-10-18 | 2019-04-25 | 中国电力科学研究院有限公司 | Fault detection method and device for highly-trusted power distribution network, and storage medium |
| US20190137556A1 (en) * | 2015-09-09 | 2019-05-09 | Beijing Inhand Networks Technology Co., Ltd. | Method and system for detecting and locating single-phase ground fault on low current grounded power-distribution network |
| RU2734164C1 (en) * | 2019-11-07 | 2020-10-13 | Федеральное государственное автономное образовательное учреждение высшего образования "Уральский федеральный университет имени первого Президента России Б.Н. Ельцина" | Method of detecting single-phase earth faults in distribution network connections |
| CN111983509A (en) * | 2020-07-14 | 2020-11-24 | 国网上海市电力公司 | Distributed line fault detection method and device |
-
2021
- 2021-01-27 CN CN202110108592.9A patent/CN113030634B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI20031546A0 (en) * | 2003-10-22 | 2003-10-22 | Abb Oy | Method and apparatus for identifying an intermittent earth fault in an electrical distribution network |
| CN104101812A (en) * | 2013-04-09 | 2014-10-15 | 北京映翰通网络技术股份有限公司 | Single-phase grounding fault detection and positioning method and system for low-current grounding power distribution network |
| US20140309953A1 (en) * | 2013-04-10 | 2014-10-16 | Mitsubishi Electric Research Laboratories, Inc. | Method for Locating of Single-Phase-to-Ground Faults of Ungrounded Power Distribution Systems |
| CN103728532A (en) * | 2013-12-26 | 2014-04-16 | 长园深瑞继保自动化有限公司 | Power distribution network single-phase grounding fault judging and locating method |
| US20190137556A1 (en) * | 2015-09-09 | 2019-05-09 | Beijing Inhand Networks Technology Co., Ltd. | Method and system for detecting and locating single-phase ground fault on low current grounded power-distribution network |
| WO2019075671A1 (en) * | 2017-10-18 | 2019-04-25 | 中国电力科学研究院有限公司 | Fault detection method and device for highly-trusted power distribution network, and storage medium |
| CN208369312U (en) * | 2018-05-21 | 2019-01-11 | 浙江中新电力发展集团有限公司萧山科技分公司 | The distributed DTU terminal of accurate detection singlephase earth fault |
| RU2734164C1 (en) * | 2019-11-07 | 2020-10-13 | Федеральное государственное автономное образовательное учреждение высшего образования "Уральский федеральный университет имени первого Президента России Б.Н. Ельцина" | Method of detecting single-phase earth faults in distribution network connections |
| CN111983509A (en) * | 2020-07-14 | 2020-11-24 | 国网上海市电力公司 | Distributed line fault detection method and device |
Non-Patent Citations (2)
| Title |
|---|
| ZHENG QI 等: "Research on Algorithm for Single-Phase-to-Earth Fault Section Location in Medium Voltage Distribution", 《2012 ASIA-PACIFIC POWER AND ENERGY ENGINEERING CONFERENCE》, pages 1 - 5 * |
| 齐郑 等: "配电网单相接地故障区段定位矩阵算法的研究", 《电力***保护与控制》, vol. 38, no. 20, pages 159 - 163 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113702692A (en) * | 2021-07-20 | 2021-11-26 | 中国电力科学研究院有限公司 | Method and device for synchronously monitoring current data of power distribution Internet of things |
| CN113567811A (en) * | 2021-08-13 | 2021-10-29 | 广东电网有限责任公司 | Distribution line single-phase fault detection method and related device |
| CN113567811B (en) * | 2021-08-13 | 2023-02-17 | 广东电网有限责任公司 | Distribution line single-phase fault detection method and related device |
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