CN109521326A - A kind of Earth design method based on distribution circuit electric voltage distribution curve - Google Patents
A kind of Earth design method based on distribution circuit electric voltage distribution curve Download PDFInfo
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- CN109521326A CN109521326A CN201811362524.XA CN201811362524A CN109521326A CN 109521326 A CN109521326 A CN 109521326A CN 201811362524 A CN201811362524 A CN 201811362524A CN 109521326 A CN109521326 A CN 109521326A
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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
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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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
Abstract
The invention discloses a kind of Earth design methods based on distribution circuit electric voltage distribution curve, this method are as follows: voltage distribution curves are drawn according to the distance of distribution circuit electric voltage monitoring point distance line starting point and voltage value, according to certain time interval, compare the deviation of current voltage distribution curve and reference voltage distribution curve, if deviation amplitude is greater than setting value, then it is assumed that ground fault occurs for distribution line.The present invention enormously simplifies fault monitoring device, and ground fault identifies and positions simpler, efficiently solves the problems, such as that equipment investment amount existing in the prior art is big, distribution line ground fault identifies and positions difficulty.
Description
Technical field
The invention belongs to Earth design monitoring technical fields, and in particular to one kind is bent based on distribution circuit electric voltage distribution
The Earth design method of line.
Background technique
The monitoring and positioning of distribution line ground fault are a great problem of electric system for a long time, traditional method
It is to install a large amount of devices additional in distrbution network, is such as mounted on the low current wiring line selection apparatus of substation, is mounted on distribution line
On earth-fault indicator etc..These methods can partially solve the problems, such as the identification of distribution line ground fault, however because of palpus
A large amount of human and material resources and maintenance cost are put into, fails to implement in full in distribution network construction, distribution network line Earth design
Difficult problem will long-term existence.
Summary of the invention
Technical problem solved by the present invention is providing a kind of Earth design based on distribution circuit electric voltage distribution curve
Method, to solve, equipment investment amount existing in the prior art is big, distribution line ground fault identifies and positions difficult problem.
The technical scheme adopted by the invention is as follows: a kind of Earth design side based on distribution circuit electric voltage distribution curve
Method, method includes the following steps:
Step 1, the geographic paths according to distribution line are that unit draws abscissa according to kilometer；Voltage according to distribution line
Grade draws ordinate as unit of kilovolt；
Step 2, using the starting point of distribution line as abscissa zero point, the voltage transformer of each monitoring point is apart from starting point on route
Distance is abscissa value, using the line voltage value of each monitoring point voltage measuring transformer as ordinate value, draws coordinate points, with
This connects each coordinate points and forms voltage distribution curves, takes song on the basis of the voltage distribution curves of distribution line normal operating condition
Line；
Step 3, with 1 minute for time interval, it is bent that voltage's distribiuting is drawn according to the voltage value of distribution circuit electric voltage transformer test
Line then determines that small current neutral grounding occurs for distribution line when finding that voltage distribution curves deviate datum curve and amplitude is greater than 2kV
Failure, ground fault section are direct in maximum two monitoring points of the slope of curve.
According to the slope of voltage distribution curves, the position section that ground fault occurs is determined, ground fault occurs in slope
Between maximum two test points.
Earth fault type is differentiated according to deviation amplitude, is then determined as indirect earthed failure if general deviation；If tight
Weight deviation, i.e. voltage value are then judged to being directly grounded failure close to zero.
Beneficial effects of the present invention: compared with prior art, the present invention is according to distribution circuit electric voltage monitoring point distance line
The distance and voltage value of starting point draw voltage distribution curves and compare current voltage distribution curve and base according to certain time interval
The deviation of quasi- voltage distribution curves, if deviation amplitude is greater than setting value, then it is assumed that ground fault occurs for distribution line, and the present invention is big
Fault monitoring device is simplified greatly, and ground fault identifies and positions more simply, efficiently solves equipment existing in the prior art
Input amount is big, distribution line ground fault identifies and positions difficult problem.
Detailed description of the invention
Fig. 1 is reference voltage distribution curve schematic diagram of the present invention；
Fig. 2 is the indirect earthed false voltage distribution curve schematic diagram of present example；
Fig. 3 is that present example is directly grounded false voltage distribution curve schematic diagram；
Fig. 4 is ground fault identification process figure of the present invention.
Specific embodiment
With reference to the accompanying drawing and the present invention is described further in specific embodiment.
Embodiment 1: as Figure 1-Figure 4, a kind of Earth design method based on distribution circuit electric voltage distribution curve,
Method includes the following steps:
Step 1, the geographic paths according to distribution line are that unit draws abscissa according to kilometer；Voltage according to distribution line
Grade draws ordinate as unit of kilovolt；
Step 2, using the starting point of distribution line as abscissa zero point, the voltage transformer of each monitoring point is apart from starting point on route
Distance is abscissa value, using the line voltage value of each monitoring point voltage measuring transformer as ordinate value, draws coordinate points, with
This connects each coordinate points and forms voltage distribution curves, takes song on the basis of the voltage distribution curves of distribution line normal operating condition
Line；
Step 3, with 1 minute for time interval, it is bent that voltage's distribiuting is drawn according to the voltage value of distribution circuit electric voltage transformer test
Line then determines that small current neutral grounding occurs for distribution line when finding that voltage distribution curves deviate datum curve and amplitude is greater than 2kV
Failure, ground fault section are direct in maximum two monitoring points of the slope of curve.
According to the slope of voltage distribution curves, the position section that ground fault occurs is determined, ground fault occurs in slope
Between maximum two test points.
Earth fault type is differentiated according to deviation amplitude, is then determined as indirect earthed failure if general deviation；If tight
Weight deviation, i.e. voltage value are then judged to being directly grounded failure close to zero.
The voltage distribution curves of attached drawing 2 and attached drawing 3 are deviated with reference voltage curve, from line after B point in attached drawing 2
Road voltage value illustrates that route is grounded between 5kV and 7kV, and output causes line voltage distribution to reduce earth-current, but is grounded electricity
Resistance less, belongs to indirect earthed failure.Suddenly decline in attached drawing 3 from line voltage distribution after B point and close to zero, illustrates that route connects
Ground resistance very little, belongs to and is directly grounded failure.
Maximum slope in voltage distribution curves between B point and C point, tends towards stability later, illustrates to occur between this two o'clock
Ground fault leads to C point voltage dip.
Example that the above description is merely a specific embodiment, scope of protection of the present invention is not limited thereto.It is ripe
It knows the those skilled in the art in the technical scope disclosed by the present invention, change or replacement mode can be easily found, these
It should be covered by the protection scope of the present invention.For this purpose, protection scope of the present invention should be with the protection model of the claim
Subject to enclosing.
Claims (3)
1. a kind of Earth design method based on distribution circuit electric voltage distribution curve, it is characterised in that: this method include with
Lower step:
Step 1, the geographic paths according to distribution line are that unit draws abscissa according to kilometer；Voltage according to distribution line
Grade draws ordinate as unit of kilovolt；
Step 2, using the starting point of distribution line as abscissa zero point, the voltage transformer of each monitoring point is apart from starting point on route
Distance is abscissa value, using the line voltage value of each monitoring point voltage measuring transformer as ordinate value, draws coordinate points, with
This connects each coordinate points and forms voltage distribution curves, takes song on the basis of the voltage distribution curves of distribution line normal operating condition
Line；
Step 3, with 1 minute for time interval, it is bent that voltage's distribiuting is drawn according to the voltage value of distribution circuit electric voltage transformer test
Line then determines that small current neutral grounding occurs for distribution line when finding that voltage distribution curves deviate datum curve and amplitude is greater than 2kV
Failure, ground fault section are direct in maximum two monitoring points of the slope of curve.
2. a kind of Earth design method based on distribution circuit electric voltage distribution curve according to claim 1, special
Sign is: according to the slope of voltage distribution curves, determine the position section that ground fault occurs, ground fault occur slope most
Between two big test points.
3. a kind of Earth design method based on distribution circuit electric voltage distribution curve according to claim 1, special
Sign is: differentiating earth fault type according to deviation amplitude, is then determined as indirect earthed failure if general deviation；If serious
Deviation, i.e. voltage value are then judged to being directly grounded failure close to zero.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811362524.XA CN109521326B (en) | 2018-11-15 | 2018-11-15 | Ground fault positioning method based on voltage distribution curve of distribution line |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811362524.XA CN109521326B (en) | 2018-11-15 | 2018-11-15 | Ground fault positioning method based on voltage distribution curve of distribution line |
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| CN109521326A true CN109521326A (en) | 2019-03-26 |
| CN109521326B CN109521326B (en) | 2020-11-13 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110244107A (en) * | 2019-07-05 | 2019-09-17 | 杭州西湖电子研究所 | A kind of wide area end shield earth current two-dimensional map expression |
| CN111323731A (en) * | 2020-03-30 | 2020-06-23 | 珠海优特电力科技股份有限公司 | Method and device for detecting fault of grounding device and storage medium |
| CN111413591A (en) * | 2020-04-29 | 2020-07-14 | 华中科技大学 | Fault positioning method and device based on voltage fault component distribution characteristics |
| CN111426913A (en) * | 2020-04-17 | 2020-07-17 | 南方电网科学研究院有限责任公司 | Fault positioning method and system based on positive sequence voltage distribution characteristics |
| CN111736039A (en) * | 2020-08-21 | 2020-10-02 | 武汉品迅科技有限公司 | Distribution line fault positioning method and system |
| CN113238120A (en) * | 2021-05-18 | 2021-08-10 | 国网河北省电力有限公司电力科学研究院 | Power distribution network fault position determining method based on photovoltaic power station and terminal equipment |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110244107A (en) * | 2019-07-05 | 2019-09-17 | 杭州西湖电子研究所 | A kind of wide area end shield earth current two-dimensional map expression |
| CN110244107B (en) * | 2019-07-05 | 2021-12-07 | 杭州西湖电子研究所 | Wide-area end screen grounding current two-dimensional map expression method |
| CN111323731A (en) * | 2020-03-30 | 2020-06-23 | 珠海优特电力科技股份有限公司 | Method and device for detecting fault of grounding device and storage medium |
| CN111426913A (en) * | 2020-04-17 | 2020-07-17 | 南方电网科学研究院有限责任公司 | Fault positioning method and system based on positive sequence voltage distribution characteristics |
| CN111426913B (en) * | 2020-04-17 | 2021-07-27 | 南方电网科学研究院有限责任公司 | Fault positioning method and system based on positive sequence voltage distribution characteristics |
| CN111413591A (en) * | 2020-04-29 | 2020-07-14 | 华中科技大学 | Fault positioning method and device based on voltage fault component distribution characteristics |
| CN111413591B (en) * | 2020-04-29 | 2021-10-08 | 华中科技大学 | Fault positioning method and device based on voltage fault component distribution characteristics |
| CN111736039A (en) * | 2020-08-21 | 2020-10-02 | 武汉品迅科技有限公司 | Distribution line fault positioning method and system |
| CN111736039B (en) * | 2020-08-21 | 2020-11-13 | 武汉品迅科技有限公司 | Distribution line fault positioning method and system |
| CN113238120A (en) * | 2021-05-18 | 2021-08-10 | 国网河北省电力有限公司电力科学研究院 | Power distribution network fault position determining method based on photovoltaic power station and terminal equipment |
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