CN112485719A - Power distribution network transmission line ground fault detection method - Google Patents
Power distribution network transmission line ground fault detection method Download PDFInfo
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- CN112485719A CN112485719A CN202011489599.1A CN202011489599A CN112485719A CN 112485719 A CN112485719 A CN 112485719A CN 202011489599 A CN202011489599 A CN 202011489599A CN 112485719 A CN112485719 A CN 112485719A
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- ground fault
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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
- G01R31/50—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
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention relates to a method for detecting a power distribution network transmission line ground fault, which comprises the following steps: acquiring a three-phase current value in the power transmission line in real time; detecting the ground fault according to the sampled three-phase current, and obtaining a time point t corresponding to the moment when the ground fault is just detected; determining whether the single-phase ground fault or the two-phase ground fault is determined according to three phase current break variables and current amplitudes at the time t; and after the ground fault is determined, generating a fault alarm signal and sending the fault alarm signal to the intelligent terminal corresponding to the branch line through the wireless communication device. The invention can quickly and accurately determine the fault occurrence area and the fault occurrence time in time, thereby reducing the fault occurrence rate.
Description
Technical Field
The invention relates to a ground fault detection method, in particular to a power distribution network transmission line ground fault detection method.
Background
The transmission line is responsible for bearing electric energy transmission and distribution tasks, is an important component of the power grid, and has very important significance for the safety and stability of the whole power grid if the transmission line is operated safely and reliably. The real-time monitoring of the ground fault point at the ground fault position of the power transmission line is beneficial to timely mastering the influence condition of the ground fault on the thermal stability and dynamic stability of the power transmission line, and a reliable decision basis is provided for ensuring the line safety and the power grid stability.
Aiming at the phenomenon of the earth fault which often occurs in the power transmission line, if the load switch is manually pulled and then closed to search the earth point by the existing method during processing, a large workload is brought to inspection personnel, and the inspection personnel are required to have related experience of judging the fault and processing the fault mode. Therefore, the fast and effective identification of the grounding fault phase for subsequent fault handling is a problem that needs to be solved in the field.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the power distribution network transmission line ground fault detection method, which can quickly and effectively identify the ground fault phase and provide convenient conditions for subsequent fault treatment.
A power distribution network transmission line ground fault detection method comprises the following steps:
step 1, collecting three-phase current values in a power transmission line in real time;
step 2, detecting the ground fault according to the sampled three-phase current, and obtaining a time point t corresponding to the moment when the ground fault is just detected;
step 3, determining whether the single-phase ground fault or the two-phase ground fault is generated according to the three phase current abrupt change quantities and the current amplitude at the moment t;
and 4, after the earth fault is determined, generating a fault alarm signal and sending the fault alarm signal to the intelligent terminal corresponding to the branch line through the wireless communication device.
In step 3, the criterion of the fault starting is as follows: and detecting whether the current mutation quantity reaches a current mutation quantity fixed value threshold or whether the current amplitude reaches a current amplitude fixed value threshold, and if the detected current mutation quantity reaches the current mutation quantity fixed value threshold or the detected current amplitude reaches the current amplitude fixed value threshold, judging that the ground fault occurs.
In step 3, the upper limit setting interval of the current amplitude fixed value threshold is 1.0 to 1.5 times of the rated current value, and the lower limit setting interval is 0.1 to 0.3 times of the rated current value.
The invention has the technical effects and advantages that:
the invention improves the accuracy of line grounding fault judgment and shortens the fault searching time; the method has the advantages of reducing the daily maintenance workload of the distribution network line, improving the working efficiency, ensuring the reliable operation of the distribution network system, determining the fault occurrence area and the fault occurrence time quickly and accurately in time, reducing the fault occurrence rate and shortening the power failure maintenance time.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
A power distribution network transmission line ground fault detection method comprises the following steps:
step 1, collecting three-phase current values in a power transmission line in real time;
step 2, detecting the ground fault according to the sampled three-phase current, and obtaining a time point t corresponding to the moment when the ground fault is just detected;
step 3, determining whether the single-phase ground fault or the two-phase ground fault is generated according to the three phase current abrupt change quantities and the current amplitude at the moment t;
and 4, after the earth fault is determined, generating a fault alarm signal and sending the fault alarm signal to the intelligent terminal corresponding to the branch line through the wireless communication device.
In step 3, the criterion of the fault starting is as follows: and detecting whether the current mutation quantity reaches a current mutation quantity fixed value threshold or whether the current amplitude reaches a current amplitude fixed value threshold, and if the detected current mutation quantity reaches the current mutation quantity fixed value threshold or the detected current amplitude reaches the current amplitude fixed value threshold, judging that the ground fault occurs.
In step 3, the upper limit setting interval of the current amplitude fixed value threshold is 1.0 to 1.5 times of the rated current value, and the lower limit setting interval is 0.1 to 0.3 times of the rated current value.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. A power distribution network transmission line ground fault detection method is characterized by comprising the following steps:
step 1, collecting three-phase current values in a power transmission line in real time;
step 2, detecting the ground fault according to the sampled three-phase current, and obtaining a time point t corresponding to the moment when the ground fault is just detected;
step 3, determining whether the single-phase ground fault or the two-phase ground fault is generated according to the three phase current abrupt change quantities and the current amplitude at the moment t;
and 4, after the earth fault is determined, generating a fault alarm signal and sending the fault alarm signal to the intelligent terminal corresponding to the branch line through the wireless communication device.
2. The method for detecting the ground fault of the power transmission line of the power distribution network according to claim 1, wherein in the step 3, the criterion of fault starting is as follows: and detecting whether the current mutation quantity reaches a current mutation quantity fixed value threshold or whether the current amplitude reaches a current amplitude fixed value threshold, and if the detected current mutation quantity reaches the current mutation quantity fixed value threshold or the detected current amplitude reaches the current amplitude fixed value threshold, judging that the ground fault occurs.
3. The method according to claim 2, wherein in step 3, the upper limit setting interval of the current amplitude fixed threshold is 1.0 to 1.5 times of the rated current value, and the lower limit setting interval is 0.1 to 0.3 times of the rated current value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011489599.1A CN112485719A (en) | 2020-12-17 | 2020-12-17 | Power distribution network transmission line ground fault detection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011489599.1A CN112485719A (en) | 2020-12-17 | 2020-12-17 | Power distribution network transmission line ground fault detection method |
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| CN112485719A true CN112485719A (en) | 2021-03-12 |
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| CN202011489599.1A Pending CN112485719A (en) | 2020-12-17 | 2020-12-17 | Power distribution network transmission line ground fault detection method |
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Citations (8)
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| CN101813739A (en) * | 2010-04-14 | 2010-08-25 | 天津大学 | Adaptive three-phase symmetric fault phase selecting method for ultra high voltage transmission line |
| CN103439635A (en) * | 2013-09-06 | 2013-12-11 | 华北电力大学 | Electric power system wave-recoding file based fault detection method and system |
| 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 |
| CN104764971A (en) * | 2015-03-18 | 2015-07-08 | 广东电网有限责任公司电力科学研究院 | Power distribution network overhead line single-phase grounding fault recognition positioning method and fault indicator |
| US20160041216A1 (en) * | 2013-03-29 | 2016-02-11 | Beijing Inhand Networks Technology Co., Ltd. | Method and system for detecting and locating single-phase ground fault on low current grounded power-distribution network |
| CN106646139A (en) * | 2016-12-30 | 2017-05-10 | 华北电力大学 | Method for positioning faults of power distribution network based on amplitude analysis of three-phase current |
| CN111562465A (en) * | 2020-05-25 | 2020-08-21 | 国网上海市电力公司 | Fault recording-based high-voltage distribution network hybrid line fault location method |
| CN111579919A (en) * | 2020-04-14 | 2020-08-25 | 威胜电气有限公司 | Power distribution network single-phase earth fault detection method and system |
-
2020
- 2020-12-17 CN CN202011489599.1A patent/CN112485719A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813739A (en) * | 2010-04-14 | 2010-08-25 | 天津大学 | Adaptive three-phase symmetric fault phase selecting method for ultra high voltage transmission line |
| 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 |
| US20160041216A1 (en) * | 2013-03-29 | 2016-02-11 | Beijing Inhand Networks Technology Co., Ltd. | Method and system for detecting and locating single-phase ground fault on low current grounded power-distribution network |
| CN103439635A (en) * | 2013-09-06 | 2013-12-11 | 华北电力大学 | Electric power system wave-recoding file based fault detection method and system |
| CN104764971A (en) * | 2015-03-18 | 2015-07-08 | 广东电网有限责任公司电力科学研究院 | Power distribution network overhead line single-phase grounding fault recognition positioning method and fault indicator |
| CN106646139A (en) * | 2016-12-30 | 2017-05-10 | 华北电力大学 | Method for positioning faults of power distribution network based on amplitude analysis of three-phase current |
| CN111579919A (en) * | 2020-04-14 | 2020-08-25 | 威胜电气有限公司 | Power distribution network single-phase earth fault detection method and system |
| CN111562465A (en) * | 2020-05-25 | 2020-08-21 | 国网上海市电力公司 | Fault recording-based high-voltage distribution network hybrid line fault location method |
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Application publication date: 20210312 |