CN113203915A - Multi-source information fusion power distribution network single-phase line fault analysis method - Google Patents
Multi-source information fusion power distribution network single-phase line fault analysis method Download PDFInfo
- Publication number
- CN113203915A CN113203915A CN202110410008.5A CN202110410008A CN113203915A CN 113203915 A CN113203915 A CN 113203915A CN 202110410008 A CN202110410008 A CN 202110410008A CN 113203915 A CN113203915 A CN 113203915A
- Authority
- CN
- China
- Prior art keywords
- phase
- fault
- monitoring terminal
- line
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
-
- 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
Abstract
The invention discloses a multisource information fusion power distribution network single-phase line fault analysis method which is used for rapidly identifying and positioning single-phase faults of a power distribution network and comprises the following steps: s1, identifying the single-phase fault, specifically comprising: s11, acquiring line voltage and phase voltage at each monitoring terminal in the power distribution network in real time; s12, judging whether the bus to which the monitoring terminal belongs has a single-phase disconnection fault or a single-phase grounding disconnection fault; s2, positioning the single-phase fault, specifically comprising: s21, positioning the single-phase disconnection fault; and S22, positioning the single-phase earth disconnection fault. The method and the device realize accurate and rapid identification of different single-phase line faults and positioning of fault occurrence sections, and provide effective support for fault repair.
Description
Technical Field
The invention relates to the technical field of power system fault analysis methods, in particular to a multi-source information fusion power distribution network single-phase line fault analysis method.
Background
In common faults of 10kV power distribution networks in China, the single-phase line fault accounts for over 70 percent; the single-phase earth disconnection fault is the most common fault, and the non-fault phase voltage is increased after the single-phase earth disconnection fault occurs, so that a series fault is easily formed, and potential safety hazards are caused; although the single-phase line break fault has low occurrence frequency, the single-phase line break fault is easy to cause equipment damage, fire disasters and even serious consequences of personal electric shock casualty accidents. Therefore, single-phase faults and types of the power distribution network need to be quickly identified and distinguished and positioned so as to take measures to control and repair in time and avoid serious accidents.
Disclosure of Invention
In view of this, a multi-source information fusion power distribution network single-phase line fault analysis method capable of rapidly identifying and locating a power distribution network single-phase fault is needed.
A multi-source information fusion power distribution network single-phase line fault analysis method comprises the following steps:
s1, identifying single-phase faults;
s11, acquiring line voltage and phase voltage at each monitoring terminal on each bus in the power distribution network in real time;
s12, when the amplitude of any two line voltages at a certain monitoring terminal is abnormal and the amplitude of the remaining line voltage is normal, judging that the bus to which the monitoring terminal belongs has a single-phase line break fault, and the common phase of the two line voltages with abnormal amplitudes is a line break phase;
when the amplitudes of three line voltages at a certain monitoring terminal are normal and one phase voltage is reduced to 0, judging that a single-phase earth disconnection fault occurs on a bus to which the monitoring terminal belongs and the phase with the phase voltage of 0 is an earth fault phase;
s2, positioning the single-phase fault;
s21, positioning the bus with the single-phase disconnection fault by adopting the following steps;
s210, for a bus with a single-phase line break fault, taking a monitoring terminal with abnormal line voltage as a starting point, tracing upstream along the bus until a monitoring terminal with normal three-phase line voltage is found, taking the monitoring terminal with normal three-phase line voltage as the starting point, and taking the monitoring terminal with abnormal line voltage as a section of a terminal point, wherein the section is a single-phase line break fault section;
s211, acquiring open-circuit phase voltages at the starting point and the ending point of the single-phase open-circuit fault section;
if the phase voltage of the broken line at the starting point is lower than 10% of a normal value, judging that the single-phase broken line power supply side earth fault occurs in the single-phase broken line fault section; if the phase voltage of the broken line at the end point is lower than 10% of the normal value, judging that the single-phase broken line load side ground fault occurs in the single-phase fault section; otherwise, judging that the single-phase disconnection ungrounded fault occurs in the single-phase fault section;
s22, positioning the bus with the single-phase earth disconnection fault by adopting the following steps:
s220, checking the time when the voltage of the phase with the ground fault at each monitoring terminal on the bus is reduced to 0, and acquiring a three-phase current waveform 200ms after the time;
s221, performing band-pass filtering on the three-phase current waveform to obtain three-phase current waveform components within a characteristic frequency range of 140Hz to 160 Hz;
s222, when the amplitude of the earth fault phase current component at a certain monitoring terminal is more than or equal to 3 times of the sum of the amplitudes of the non-fault phase current components, judging that the single-phase earth non-disconnection fault occurs at the downstream of the monitoring terminal; when the earth fault phase current component amplitude values are smaller than the non-fault phase current sharing amplitude value, judging that the single-phase earth non-disconnection fault occurs at the upstream of the monitoring terminal or other buses;
and S223, if the upstream monitoring terminal of a certain section is judged to have the single-phase earth disconnection fault at the downstream of the monitoring terminal, and the downstream monitoring terminal is judged to have the single-phase earth disconnection fault at the upstream of the monitoring terminal or on other buses, the single-phase earth disconnection fault in the section is judged.
Preferably, in step S12, the line voltage amplitude is abnormal, and the line voltage amplitude is reduced to 50% of the normal value.
According to the multi-source information power distribution network single-phase line fault analysis method, voltage and current data are monitored in real time on the basis of a plurality of monitoring terminals which extend and are distributed on a bus in the existing power distribution network, the characteristics of changes of line voltage, phase voltage and phase current after single-phase line breakage are utilized, and voltage and current information of multiple places and multiple periods is fused, so that accurate and rapid identification of different single-phase line faults and positioning of fault occurrence sections are realized, and effective support is provided for fault repair.
Drawings
Fig. 1 is a schematic diagram of a conventional 10kV distribution network monitoring terminal in the invention.
FIG. 2 is a flow chart of the present invention.
Detailed Description
The technical solutions and effects of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings of the present invention.
Referring to fig. 1, in a conventional 10kV distribution network, a plurality of monitoring terminals are generally distributed on a main line along a line in an extending manner, a 10kV/220V distribution transformer is equipped at the end of a 10kV branch line, and the monitoring terminals can monitor local voltage and current data in real time. Referring to fig. 2, a method for analyzing a single-phase line fault of a multi-source information fusion power distribution network includes the following steps:
s1, identifying single-phase faults;
s11, acquiring line voltage and phase voltage at each monitoring terminal on each bus in the power distribution network in real time;
s12, when the amplitude of any two line voltages at a certain monitoring terminal is abnormal and the amplitude of the remaining line voltage is normal, judging that the bus to which the monitoring terminal belongs has a single-phase line break fault, and the common phase of the two line voltages with abnormal amplitudes is a line break phase;
when the amplitudes of three line voltages at a certain monitoring terminal are normal and one phase voltage is reduced to 0, judging that a single-phase earth disconnection fault occurs on a bus to which the monitoring terminal belongs and the phase with the phase voltage of 0 is an earth fault phase;
s2, positioning the single-phase fault;
s21, positioning the bus with the single-phase disconnection fault by adopting the following steps;
s210, for a bus with a single-phase line break fault, taking a monitoring terminal with abnormal line voltage as a starting point, tracing upstream along the bus until a monitoring terminal with normal three-phase line voltage is found, taking the monitoring terminal with normal three-phase line voltage as the starting point, and taking the monitoring terminal with abnormal line voltage as a section of a terminal point, wherein the section is a single-phase line break fault section;
s211, acquiring open-circuit phase voltages at the starting point and the ending point of the single-phase open-circuit fault section;
if the phase voltage of the broken line at the starting point is lower than 10% of a normal value, judging that the single-phase broken line power supply side earth fault occurs in the single-phase broken line fault section; if the phase voltage of the broken line at the end point is lower than 10% of the normal value, judging that the single-phase broken line load side ground fault occurs in the single-phase fault section; otherwise, judging that the single-phase disconnection ungrounded fault occurs in the single-phase fault section;
s22, positioning the bus with the single-phase earth disconnection fault by adopting the following steps:
s220, checking the time when the voltage of the phase with the ground fault at each monitoring terminal on the bus is reduced to 0, and acquiring a three-phase current waveform 200ms after the time;
s221, performing band-pass filtering on the three-phase current waveform to obtain three-phase current waveform components within a characteristic frequency range of 140Hz to 160 Hz;
s222, when the amplitude of the earth fault phase current component at a certain monitoring terminal is more than or equal to 3 times of the sum of the amplitudes of the non-fault phase current components, judging that the single-phase earth non-disconnection fault occurs at the downstream of the monitoring terminal; when the earth fault phase current component amplitude values are smaller than the non-fault phase current sharing amplitude value, judging that the single-phase earth non-disconnection fault occurs at the upstream of the monitoring terminal or other buses;
and S223, if the upstream monitoring terminal of a certain section is judged to have the single-phase earth disconnection fault at the downstream of the monitoring terminal, and the downstream monitoring terminal is judged to have the single-phase earth disconnection fault at the upstream of the monitoring terminal or on other buses, the single-phase earth disconnection fault in the section is judged.
Further, in step S12, the line voltage amplitude is abnormal, and the line voltage amplitude is reduced to 50% of the normal value.
According to the multi-source information power distribution network single-phase line fault analysis method, voltage and current data are monitored in real time on the basis of a plurality of monitoring terminals which extend and are distributed on a bus in the existing power distribution network, the characteristics of changes of line voltage, phase voltage and phase current after single-phase line breakage are utilized, and voltage and current information of multiple places and multiple periods is fused, so that accurate and rapid identification of different single-phase line faults and positioning of fault occurrence sections are realized, and effective support is provided for fault repair.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (2)
1. A multi-source information fusion power distribution network single-phase line fault analysis method is characterized by comprising the following steps:
s1, identifying single-phase faults;
s11, acquiring line voltage and phase voltage at each monitoring terminal on each bus in the power distribution network in real time;
s12, when the amplitude of any two line voltages at a certain monitoring terminal is abnormal and the amplitude of the remaining line voltage is normal, judging that the bus to which the monitoring terminal belongs has a single-phase line break fault, and the common phase of the two line voltages with abnormal amplitudes is a line break phase;
when the amplitudes of three line voltages at a certain monitoring terminal are normal and one phase voltage is reduced to 0, judging that a single-phase earth disconnection fault occurs on a bus to which the monitoring terminal belongs and the phase with the phase voltage of 0 is an earth fault phase;
s2, positioning the single-phase fault;
s21, positioning the bus with the single-phase disconnection fault by adopting the following steps;
s210, for a bus with a single-phase line break fault, taking a monitoring terminal with abnormal line voltage as a starting point, tracing upstream along the bus until a monitoring terminal with normal three-phase line voltage is found, taking the monitoring terminal with normal three-phase line voltage as the starting point, and taking the monitoring terminal with abnormal line voltage as a section of a terminal point, wherein the section is a single-phase line break fault section;
s211, acquiring open-circuit phase voltages at the starting point and the ending point of the single-phase open-circuit fault section;
if the phase voltage of the broken line at the starting point is lower than 10% of a normal value, judging that the single-phase broken line power supply side earth fault occurs in the single-phase broken line fault section; if the phase voltage of the broken line at the end point is lower than 10% of the normal value, judging that the single-phase broken line load side ground fault occurs in the single-phase fault section; otherwise, judging that the single-phase disconnection ungrounded fault occurs in the single-phase fault section;
s22, positioning the bus with the single-phase earth disconnection fault by adopting the following steps:
s220, checking the time when the voltage of the phase with the ground fault at each monitoring terminal on the bus is reduced to 0, and acquiring a three-phase current waveform 200ms after the time;
s221, performing band-pass filtering on the three-phase current waveform to obtain three-phase current waveform components within a characteristic frequency range of 140Hz to 160 Hz;
s222, when the amplitude of the earth fault phase current component at a certain monitoring terminal is more than or equal to 3 times of the sum of the amplitudes of the non-fault phase current components, judging that the single-phase earth non-disconnection fault occurs at the downstream of the monitoring terminal; when the earth fault phase current component amplitude values are smaller than the non-fault phase current sharing amplitude value, judging that the single-phase earth non-disconnection fault occurs at the upstream of the monitoring terminal or other buses;
and S223, if the upstream monitoring terminal of a certain section is judged to have the single-phase earth disconnection fault at the downstream of the monitoring terminal, and the downstream monitoring terminal is judged to have the single-phase earth disconnection fault at the upstream of the monitoring terminal or on other buses, the single-phase earth disconnection fault in the section is judged.
2. The multi-source information fusion power distribution network single-phase line fault analysis method of claim 1, characterized in that:
in step S12, the line voltage amplitude is abnormal, and the line voltage amplitude is reduced to 50% of the normal value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110410008.5A CN113203915B (en) | 2021-04-16 | 2021-04-16 | Multi-source information fusion power distribution network single-phase line fault analysis method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110410008.5A CN113203915B (en) | 2021-04-16 | 2021-04-16 | Multi-source information fusion power distribution network single-phase line fault analysis method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113203915A true CN113203915A (en) | 2021-08-03 |
| CN113203915B CN113203915B (en) | 2022-10-28 |
Family
ID=77027230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110410008.5A Active CN113203915B (en) | 2021-04-16 | 2021-04-16 | Multi-source information fusion power distribution network single-phase line fault analysis method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113203915B (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103809070A (en) * | 2012-11-15 | 2014-05-21 | 施耐德电器工业公司 | Method and device for direction grounding fault detection on basis of three-phase current changes |
| CN105071362A (en) * | 2015-09-01 | 2015-11-18 | 武汉中原电子信息公司 | Novel distributed feed line automatic protection method applied to FTU |
| CN105866615A (en) * | 2016-06-16 | 2016-08-17 | 山东大学 | 10kV power distribution line disconnection fault judging method based on three-phase voltage current |
| CN106707084A (en) * | 2016-12-30 | 2017-05-24 | 武汉中原电子信息有限公司 | Method for judging single-phase grounding fault of small-current grounding system |
| CN108181553A (en) * | 2018-01-23 | 2018-06-19 | 中国石油大学(华东) | A kind of small current neutral grounding system single-phase wire break fault section location method based on line voltage variation characteristic |
| CN109324269A (en) * | 2018-12-18 | 2019-02-12 | 国网山东省电力公司电力科学研究院 | Power distribution network single-phase disconnection fault identification method based on distributed measurement |
| CN109782108A (en) * | 2019-01-31 | 2019-05-21 | 中国电力科学研究院有限公司 | A kind of single-phase grounded malfunction in grounded system of low current localization method and device |
| CN109870631A (en) * | 2019-03-05 | 2019-06-11 | 贵州电网有限责任公司 | A kind of distribution line nature of trouble confirmation method based on voltage relationship comparison |
| CN112136256A (en) * | 2018-05-18 | 2020-12-25 | Abb瑞士股份有限公司 | Method and apparatus for use in ground fault protection |
| CN112255499A (en) * | 2020-10-10 | 2021-01-22 | 重庆大学 | Phase current amplitude based power distribution network disconnection fault positioning and identifying method and system |
| CN112485588A (en) * | 2020-11-11 | 2021-03-12 | 云南电网有限责任公司临沧供电局 | Permanent high-resistance fault section positioning method based on cascade H-bridge control |
-
2021
- 2021-04-16 CN CN202110410008.5A patent/CN113203915B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103809070A (en) * | 2012-11-15 | 2014-05-21 | 施耐德电器工业公司 | Method and device for direction grounding fault detection on basis of three-phase current changes |
| CN105071362A (en) * | 2015-09-01 | 2015-11-18 | 武汉中原电子信息公司 | Novel distributed feed line automatic protection method applied to FTU |
| CN105866615A (en) * | 2016-06-16 | 2016-08-17 | 山东大学 | 10kV power distribution line disconnection fault judging method based on three-phase voltage current |
| CN106707084A (en) * | 2016-12-30 | 2017-05-24 | 武汉中原电子信息有限公司 | Method for judging single-phase grounding fault of small-current grounding system |
| CN108181553A (en) * | 2018-01-23 | 2018-06-19 | 中国石油大学(华东) | A kind of small current neutral grounding system single-phase wire break fault section location method based on line voltage variation characteristic |
| CN112136256A (en) * | 2018-05-18 | 2020-12-25 | Abb瑞士股份有限公司 | Method and apparatus for use in ground fault protection |
| CN109324269A (en) * | 2018-12-18 | 2019-02-12 | 国网山东省电力公司电力科学研究院 | Power distribution network single-phase disconnection fault identification method based on distributed measurement |
| CN109782108A (en) * | 2019-01-31 | 2019-05-21 | 中国电力科学研究院有限公司 | A kind of single-phase grounded malfunction in grounded system of low current localization method and device |
| CN109870631A (en) * | 2019-03-05 | 2019-06-11 | 贵州电网有限责任公司 | A kind of distribution line nature of trouble confirmation method based on voltage relationship comparison |
| CN112255499A (en) * | 2020-10-10 | 2021-01-22 | 重庆大学 | Phase current amplitude based power distribution network disconnection fault positioning and identifying method and system |
| CN112485588A (en) * | 2020-11-11 | 2021-03-12 | 云南电网有限责任公司临沧供电局 | Permanent high-resistance fault section positioning method based on cascade H-bridge control |
Non-Patent Citations (5)
| Title |
|---|
| JINRUI TANG ET AL: "Zero-Mode Current Distribution Analysis in Neutral Ungrounded Distribution Systems with Distributed Photovoltaic Generators under SPG Faults", 《2022 THE 4TH ASIA ENERGY AND ELECTRICAL ENGINEERING SYMPOSIUM》 * |
| 廖芳群等: "小电阻接地系统高灵敏性接地故障区段定位方法", 《电力系统保护与控制》 * |
| 张灿军等: "小电阻接地系统单相断线故障电压特征分析", 《供用电》 * |
| 王成楷，洪志章: "基于线电压判据的配电网单相断线故障定位方法", 《电气技术》 * |
| 谢德林: "《城乡电网建设改造新技术与新设备应用手册》", 30 November 1999 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113203915B (en) | 2022-10-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109633364B (en) | Mutual inductor winding and fuse fault assessment method, device and equipment | |
| CN102680854B (en) | Online monitoring method for covert faults and joint process defects of power cable | |
| CN108614180B (en) | Single-phase earth fault line searching method | |
| CN103323647A (en) | Device and method for monitoring classified insulation electromagnetic type PT primary side current | |
| CN109888733B (en) | Early warning type motor protection method and device | |
| CN105743072A (en) | High-voltage electric circuit protection system for electric motor train unit | |
| CN109831033A (en) | A kind of power supply line's early warning protection equipment and sectional monitoring early warning system | |
| CN105259488A (en) | 500kV high-voltage parallel electric reactor turn-to-turn insulation performance testing platform | |
| CN113203915B (en) | Multi-source information fusion power distribution network single-phase line fault analysis method | |
| CN107367701B (en) | Electrical fault simulation method for alternating current charging pile | |
| CN104502815A (en) | Testing device for non-linear resistor type resonance eliminator | |
| CN105182157A (en) | Neutral point multi-point grounding detection device based on high-accuracy detection current | |
| CN110927528A (en) | Transmission line fault simulation test device | |
| CN203811745U (en) | Disconnection detection device for resistor in resistor cabinet | |
| CN110857964A (en) | High-voltage interlocking loop, method for detecting electrical continuity fault by using high-voltage interlocking loop, computer storage medium and electric vehicle | |
| CN203720293U (en) | Device used for monitoring DC insulation bus interaction | |
| CN116381379A (en) | High-voltage cable online monitoring method and device based on running current and ground circulation | |
| CN105974229A (en) | Disconnection-free testing method for high voltage electric equipment in transformer substation | |
| CN205015427U (en) | Neutral point multipoint earthing detection device based on high accuracy testing electric current | |
| CN2722265Y (en) | DC grounding on-line tester | |
| CN112904150A (en) | System for recognizing and positioning high-voltage line disconnection fault based on low-voltage power distribution | |
| CN105911413A (en) | Elimination method for hidden dangers in transformer line fault | |
| Sivokobylenko et al. | Numerical simulation of transient ground faults in medium voltage networks | |
| CN111044810A (en) | Simulation test method for lightning stroke protection and wire breaking effect of ground fault processing device | |
| CN104505823A (en) | Method for power maintenance through transient power stop and transient stop selective reclosing circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |