CN111157835B - Power grid single-phase earth fault judgment method - Google Patents
Power grid single-phase earth fault judgment method Download PDFInfo
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- CN111157835B CN111157835B CN201811320971.9A CN201811320971A CN111157835B CN 111157835 B CN111157835 B CN 111157835B CN 201811320971 A CN201811320971 A CN 201811320971A CN 111157835 B CN111157835 B CN 111157835B
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention discloses a method for judging a single-phase earth fault of a power grid, which integrates independent single-phase earth fault and short-circuit fault alarm record information, analyzes fault waveform characteristics and relevance among the independent information and characteristics of disturbance waveforms such as line tripping and reclosing, and the like, forms fault overall event alarm information and pushes the fault overall event alarm information to operation and maintenance personnel, wherein the information content covers a fault generation stage, a fault development stage, a fault disposal stage and a power restoration stage, can provide powerful support for the operation and maintenance personnel to perform event full-period auxiliary decision making and timely check the fault information, and provides a data basis for advanced applications such as power failure time statistics, fault classification statistics and the like.
Description
Technical Field
The invention belongs to the technical field of power grid fault monitoring, and particularly relates to a power grid single-phase earth fault judgment method.
Background
According to statistics, more than 80% of the faults of the power distribution network are single-phase grounding faults, and diagnosis of the single-phase grounding faults is taken as a key concern item in 2015 by national power grid companies. An effective loop cannot be formed after the power distribution network is grounded in a single phase, the fault capacitance current is weak, and the fault representation information is not obvious particularly under the superposition influence of multiple factors such as over-compensation/under-compensation of an arc suppression coil, grounding transition resistance, three-phase imbalance of the power grid, function/precision limitation of a measuring device and the like. These problems affect fault location, fault isolation and fault recovery, and seriously threaten the reliability of the power distribution network.
In order to guarantee the operation stability of a power distribution network and improve the automation level of the power distribution network comprehensively in reliability, a large number of line fault positioning devices such as station terminals, feeder terminals and line fault positioning indicators have been developed for many years at home and abroad, wherein the recording type fault indicators can realize the display and analysis of single-phase earth fault waveforms, and can meet the requirements of operation and maintenance personnel on fault analysis in terms of functional application.
Disclosure of Invention
The invention provides the following technical scheme for solving the defects: the invention provides a method for judging a single-phase earth fault of a power grid, which comprises the following steps:
monitoring zero sequence voltage generated by a neutral grounding terminal of a power grid, and monitoring the duration of the zero sequence voltage when the zero sequence voltage larger than a preset zero sequence voltage threshold value is generated;
when the duration of the monitored zero sequence voltage is greater than a first time threshold, continuously monitoring whether the waveform of the zero sequence voltage continuously exists;
when the zero sequence voltage waveform does not exist continuously, monitoring whether the current of the load disappears;
if the current disappears, whether the relevant current suddenly increases before the current disappears is checked;
when relevant current surge is detected before the current disappears, the fault is judged to be line tripping caused by line short circuit, and whether the line load current is recovered within a preset second time threshold value is continuously monitored;
if the load current is not recovered within the second time threshold, inquiring whether other lines generate a zero sequence current sudden increase signal within the same time period;
if the signal that other lines generate the zero sequence current surge is inquired, the fault is judged to be line tripping caused by short circuit fault due to out-of-phase grounding, and the load current conditions of the line generating the signal of the zero sequence current surge and the current fault line are continuously monitored;
and if the load current of the two lines is recovered, the power supply is recovered, otherwise, the maintenance personnel is reminded to maintain.
In the step of monitoring the duration of the zero-sequence voltage, if the duration of the zero-sequence voltage is less than a preset first time threshold, the fault is determined to be an instantaneous single-phase earth fault, the zero-sequence voltage is continuously monitored, whether the situation that the zero-sequence voltage disappears after being greater than the zero-sequence voltage of the preset zero-sequence voltage threshold frequently occurs within a preset third time threshold interval or not occurs frequently, if the situation occurs frequently, the fault is determined to be a multiple instantaneous single-phase earth fault, and the fault content is broadcasted.
In the step of monitoring whether the current of the load disappears, if the current of the load does not disappear, whether the related current suddenly increases is checked, and if the related current does not suddenly increase, the unidirectional ground fault is determined to be relieved, and the event is broadcasted.
If relevant current of the sudden increase is monitored, whether other lines generate signals of the zero sequence current sudden increase in the same time period is checked, and if the signals of the zero sequence current sudden increase of the other lines exist, the fault is judged to be that the two lines are out of phase and grounded to cause short circuit and do not trip; if no signal of sudden increase of zero sequence current of other lines exists, the fault is judged to be line load overcurrent and not to be tripped; and after the fault is judged, broadcasting the event.
In the step of checking whether the relevant current suddenly increases before the current disappears, if the relevant current suddenly increases, the fault is judged to be the power failure of the brake, and the load current is continuously monitored.
And when the load current is continuously monitored, if the load current round of the line is obtained, the power supply is judged to be recovered, otherwise, a maintainer is reminded to maintain.
And in the step of monitoring whether the load current of the line recovers within a preset second time threshold, if the load current recovers, the line switch is judged to be reclosed, and the reclosing is successful.
In the step of inquiring whether other lines generate zero sequence current sudden-increase signals in the same time period, if the zero sequence current sudden-increase signals are not inquired, the line trip caused by the fact that the fault is a grounding fault and is derived to be a short-circuit fault is judged, and the load current is continuously monitored.
And if the load current of the line is recovered, judging that the power supply is recovered, and otherwise, reminding a maintainer to maintain.
The first time threshold value is set to be 5 minutes, the second time threshold value is set to be 3 seconds, the third time threshold value is set to be 2 hours, and the number of times of disappearance after the zero-sequence voltage with the zero-sequence voltage larger than the preset zero-sequence voltage threshold value frequently appears in the third time threshold value interval is set to be at least three times.
Compared with the prior art, the method for judging the single-phase earth fault of the power grid integrates the independent single-phase earth fault and short-circuit fault alarm record information, analyzes the fault waveform characteristics and the relevance among the independent information and the characteristics of disturbance waveforms such as line tripping and reclosing, forms fault overall event alarm information and pushes the fault overall event alarm information to operation and maintenance personnel, the information content covers a fault occurrence stage, a fault initiation stage, a fault disposal stage and a power restoration stage, powerful support can be provided for the operation and maintenance personnel to perform event full-cycle auxiliary decision and timely troubleshoot the fault information, and a data basis is provided for high-level applications such as power failure time statistics, fault classification statistics and the like.
Drawings
Fig. 1 is a schematic flow chart of a method for determining a single-phase earth fault of a power grid provided by the invention.
Fig. 2 is a logic schematic diagram of a method for judging a single-phase ground fault of a power grid according to the present invention.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may be embodied in many different forms than those herein set forth and should be readily appreciated by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Next, the present invention is described in detail by using schematic diagrams, and when the embodiments of the present invention are described in detail, the schematic diagrams are only examples for convenience of description, and the scope of protection of the present invention should not be limited herein.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic flow chart of a method for determining a single-phase ground fault of a power grid according to the present invention, and fig. 2 is a schematic logic diagram of the method for determining a single-phase ground fault of a power grid according to the present invention. The method for judging the single-phase earth fault of the power grid comprises the following steps:
s110: and monitoring the zero sequence voltage generated by the neutral grounding end of the power grid, and monitoring the duration of the zero sequence voltage when the zero sequence voltage larger than a preset zero sequence voltage threshold value is generated.
S120: and when the duration of the monitored zero sequence voltage is greater than the first time threshold, continuously monitoring whether the waveform of the zero sequence voltage exists continuously.
If the duration time of the zero sequence voltage is less than a preset first time threshold value, the fault is judged to be an instantaneous single-phase earth fault, the zero sequence voltage is continuously monitored, whether the situation that the zero sequence voltage disappears after being greater than the zero sequence voltage of the preset zero sequence voltage threshold value frequently occurs in a preset third time threshold value interval or not is judged, if the situation frequently occurs, the fault is judged to be a multiple instantaneous single-phase earth fault, and the fault content is broadcasted. The first time threshold is set to 5 minutes. The third time threshold is set to be 2 hours, and the number of times of disappearance after the zero-sequence voltage with the zero-sequence voltage larger than the preset zero-sequence voltage threshold frequently appears in the third time threshold interval is set to be at least three times.
S130: and when the zero sequence voltage waveform does not exist continuously, monitoring whether the current of the load disappears.
S140: if the current disappears, whether the relevant current suddenly increases before the current disappears is checked.
If the load current is monitored not to disappear, whether the relevant current suddenly increases or not is checked, if the relevant current suddenly increases does not exist, the unidirectional ground fault is judged to be relieved, and the event is broadcasted.
If the relevant current of the surge is monitored, whether other lines generate signals of zero sequence current surge in the same time period is checked, and if the signals of the zero sequence current surge of other lines exist, the fault is judged to be that two lines are out-of-phase grounded to cause short circuit and are not tripped; if no signal of sudden increase of zero sequence current of other lines exists, the fault is judged to be line load overcurrent and not to be tripped; and after the fault is judged, broadcasting the event.
S150: and when relevant current surge before the current disappears is detected, judging that the fault is line tripping caused by line short circuit, and continuously monitoring whether the line load current is recovered within a preset second time threshold value.
If no relevant current suddenly increases, the fault is judged to be the power failure of the brake pull, and the load current is continuously monitored.
And when the load current is continuously monitored, if the load current round of the line is obtained, judging that the power supply is recovered, and otherwise, reminding a maintainer to maintain.
S160: and if the load current is not recovered within the second time threshold, inquiring whether other lines generate a signal of zero sequence current surge within the same time period.
And if the load current is recovered, judging that the line switch is reclosed, and successfully reclosing. The second time threshold is set to 3 seconds.
S170: if the signal that other lines generate the zero sequence current surge is inquired, the fault is judged to be the line tripping caused by the short-circuit fault caused by the out-of-phase grounding, and the load current conditions of the line generating the signal of the zero sequence current surge and the current fault line are continuously monitored.
If the fault is not inquired, the fault is judged to be a line trip caused by the grounding fault and the short-circuit fault, and the load current is continuously monitored.
And if the load current of the line is recovered, judging that the power supply is recovered, otherwise, reminding a maintainer to maintain.
S180: and if the load current of the two lines is recovered, the power supply is recovered, otherwise, the maintenance personnel is reminded to maintain.
In order to guarantee the operation stability of a power distribution network and improve the automation level of the power distribution network comprehensively in reliability, a large number of line fault positioning devices such as station terminals, feeder terminals and line fault positioning indicators have been developed at home and abroad for many years, wherein the recording type fault indicators can realize the display and analysis of single-phase earth fault waveforms, and the requirements of operation and maintenance personnel on fault analysis can be met in terms of functional application.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention.
Claims (1)
1. A power grid single-phase earth fault judgment method is characterized by comprising the following steps:
monitoring zero sequence voltage generated by a neutral grounding end of a power grid, and monitoring the duration of the zero sequence voltage when the zero sequence voltage larger than a preset zero sequence voltage threshold value is generated;
when the duration of the monitored zero-sequence voltage is greater than a first time threshold, continuously monitoring whether the waveform of the zero-sequence voltage exists continuously;
when the zero sequence voltage waveform does not exist continuously, monitoring whether the current of the load disappears;
if the current disappears, whether the relevant current suddenly increases before the current disappears is checked;
when relevant current surge is detected before the current disappears, the fault is judged to be line tripping caused by line short circuit, and whether line load current recovers within a preset second time threshold value is continuously monitored;
if the load current is not recovered within the second time threshold, inquiring whether other lines generate a zero sequence current sudden increase signal within the same time period; if the signal that other lines generate zero sequence current surge is inquired, the fault is judged to be line tripping caused by short circuit fault due to out-of-phase grounding, and the load current conditions of the line generating the signal of zero sequence current surge and the current fault line are continuously monitored; if the load current of the two lines is recovered, the power supply is recovered, otherwise, the maintenance personnel is reminded to maintain; if the fault is not inquired, judging that the fault is a line trip caused by a grounding fault and a short-circuit fault, and continuously monitoring the load current; if the load current of the line is recovered, judging that the power supply is recovered, otherwise, reminding a maintainer to maintain;
in the step of monitoring the duration of the zero-sequence voltage, if the duration of the zero-sequence voltage is less than a preset first time threshold, determining that the fault is an instantaneous single-phase ground fault, continuing to monitor the zero-sequence voltage, and determining that the fault is a multiple instantaneous single-phase ground fault and broadcasting the content of the fault if the zero-sequence voltage disappears after the zero-sequence voltage of which the zero-sequence voltage is greater than the preset zero-sequence voltage threshold frequently appears within a preset third time threshold interval;
in the step of monitoring whether the current of the load disappears, if the current of the load does not disappear, whether relevant current suddenly increases is checked, if the relevant current without sudden increase does not exist, the unidirectional grounding fault is determined to be relieved, and an event is broadcasted; if the relevant current of the sudden increase is monitored, whether other lines generate a signal of the zero sequence current sudden increase or not in the same time period is checked, and if the signal of the zero sequence current sudden increase of the other lines exists, the fault is judged to be that two lines are grounded out of phase to cause short circuit and are not tripped; if no signal of sudden increase of zero sequence current of other lines exists, the fault is judged to be line load overcurrent and not to be tripped; after the fault is judged, broadcasting the event;
in the step of checking whether the relevant current suddenly increases before the current disappears, if the relevant current suddenly increases, the fault is judged to be the power failure of the brake pull, and the load current is continuously monitored; when the load current is continuously monitored, if the load current of the line is recovered, judging that the power supply is recovered, otherwise, reminding a maintainer to maintain; in the step of monitoring whether the load current of the line recovers within a preset second time threshold, if the load current recovers, the line switch is judged to be reclosed, and the reclosing is successful;
in the step of inquiring whether other lines generate a signal of zero sequence current sudden increase in the same time period;
the first time threshold value is set to be 5 minutes, the second time threshold value is set to be 3 seconds, the third time threshold value is set to be 2 hours, and the number of times of disappearance after the zero sequence voltage with the zero sequence voltage larger than the preset zero sequence voltage threshold value frequently appears in the third time threshold value interval is set to be at least three times.
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| CN113112191A (en) * | 2021-06-16 | 2021-07-13 | 广东电网有限责任公司湛江供电局 | Method and system for low-voltage fault power failure comprehensive management |
| CN114002540B (en) * | 2021-09-23 | 2024-05-28 | 南京国电南自电网自动化有限公司 | Power distribution network line development fault protection method and system |
| CN114089106B (en) * | 2021-11-16 | 2024-03-12 | 国网福建省电力有限公司电力科学研究院 | Single-phase earth fault anti-interference method for distribution automation equipment |
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