CN108303615A - A kind of localization method of low voltage electric network leakage point of electricity - Google Patents
A kind of localization method of low voltage electric network leakage point of electricity Download PDFInfo
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- CN108303615A CN108303615A CN201711486334.4A CN201711486334A CN108303615A CN 108303615 A CN108303615 A CN 108303615A CN 201711486334 A CN201711486334 A CN 201711486334A CN 108303615 A CN108303615 A CN 108303615A
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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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- 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
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention relates to the technical fields of low voltage electric network, more particularly, to a kind of localization method of low voltage electric network leakage point of electricity.This method mainly passes through the leakage current measurement to low voltage electric network characteristic point, according to the value of characteristic point leakage current, judge that next characteristic point position and leakage point of electricity investigation range, effect are the ranges that shortening personnel investigate leakage point of electricity, investigation workload is reduced, electric leakage treatment effeciency is improved.Positioning for single leakage point of electricity finds leakage point of electricity using conventional method, and complete low voltage electric network of investigation is needed under extreme case.Using above method, effectively conventional earth leakage point investigation range can be foreshortened within L0, investigation range is substantially reduced.
Description
Technical field
The present invention relates to the technical fields of low voltage electric network, more particularly, to a kind of positioning side of low voltage electric network leakage point of electricity
Method.
Background technology
Rural area low voltage electric network is intricate, and geographical environment differs greatly, and load nature of electricity consumed is various, and many factors influence low
Voltage electric grid reliable operation.Electric leakage is relatively conventional low voltage electric network failure.Electric leakage refers to circuit, switch or electrical equipment insulation damage
It is bad, so that part phase line current is flowed back the phenomenon that be directly leaked to the earth without zero curve, the electric current for leaking into the earth claims residue
Electric current or leakage current.Grid power leakage easily causes the accidents such as personal electric shock, fire, therefore after low voltage electric network leaks electricity, it is necessary to
Leakage point of electricity is found out as early as possible, carries out repair process.
China 0.4kV low pressure rural power grids mainly use the tree-shaped single irradiation structure of single supply to power at this stage, for anti-leak-stopping
Prevent personnel's electric shock when electric, low voltage electric network outlet master switch generally carries creepage protection function.Human-body safety electric current is
10mA, 50mA or more are in peril of one's life, and general user's leakage switch leakage current protection definite value is 30mA, and low voltage electric network is always opened
Leakage current protection definite value is closed to be generally located between 100mA ~ 300mA.When circuit leaks electricity, there are two types of situations, a kind of
It is instantaneity electric leakage, the duration is shorter, generally can automatic recovery of power supply if leakage switch, which carries, overlaps function；It is another
It is permanently to leak electricity, leakage current keeps a larger value for a long time, if leakage current is no more than the protection definite value of master switch, leakage
Electric protective circuit breaker does not trip, low voltage electric network continuous service in the case where there is electric leakage, needs personnel to carry out electrification leakage point of electricity and searches
Positioning, processing electric leakage.The method that leakage point of electricity is searched in main electrification at present is that artificial all fronts are patrolled, and it is impaired whether observation circuit has
Ground connection, and whether test user's leakage switch is normal one by one, whether has electric leakage to user's downlead drive test amount using split-core type meter.Due to
General rural low voltage network supply district is larger, and circuit is long, and branch line is more, and above method needs to carry out entire low voltage electric network
All standing is investigated, and causing leakage point of electricity to be searched, time-consuming, and efficiency is low.
Invention content
The present invention is at least one defect overcome described in the above-mentioned prior art, provides a kind of determining for low voltage electric network leakage point of electricity
Position method, this method can effectively reduce the investigation range of low voltage electric network leakage point of electricity, reduce leak current fault and investigate the time.
In order to solve the above technical problems, technical scheme is as follows：A kind of localization method of low voltage electric network leakage point of electricity,
Include the following steps：
S01：In low-voltage circuit position, a measures leakage current value Ia using leakage detector, if measuring for the first time, position a is set as
Low-voltage circuit power supply point position；Judged according to Ia values；When Ia is less than threshold values In, it is determined as position a back segments circuit without electric leakage,
Terminate testing process；When Ia is more than threshold values In, it is determined as that position a back segment circuits have electric leakage；
S02：First line branch point front position b after place on line a measures leakage current value Ib；Sentenced according to Ib values
It is disconnected；When Ib be more than threshold values In, be determined as leakage point of electricity after the b of position；Step 1 and its subsequent step are repeated, to low after the b of position
Crimping road branch line carries out electric leakage point location one by one, and every road branch line starting point is set as new position a at this time；When Ib is less than valve
Value In is determined as leakage point of electricity between position a and position b；
S03：Judged according to the distance between position a and position b L；When position a and position b distances L is less than L0, adopt
Leakage point of electricity is found between position a and position b with conventional method, terminates testing process；When position a and position b distances L are more than
When L0, the leakage current value Im of the intermediate point m between position a and position b is measured；
S04：Judged according to Im values；When Im is more than threshold values In, m is set as new position by judgement leakage point of electricity between m and b
A is set, step 11 and later step are repeated；When Im is less than threshold values In, m is set as new position by judgement leakage point of electricity between a and m
B is set, step 11 and later step are repeated.
Further, the value of the leakage current Ia, Ib, Im are obtained by the leakage detector measurement of low-voltage overhead line road
, specific measurement method includes：It is respectively clamped into using the current sampling device of four tape insulation bars of leakage detector tested
In A, B, C three-phase wire and N phase zero curves in three-phase and four-line low-voltage circuit, the above four road alternating current instantaneous vector values are measured
IA, IB, IC, IN calculate leakage current IL=IA+IB+IC+IN according to Kirchhoff's current law (KCL).
The electric leakage threshold values In is determined according to the leakage detector precision and distribution line field conditions that measure electric leakage.It is excellent
Choosing, the In is set as common 1mA.
Further, the L0 is the range that leakage point of electricity is searched using traditional artificial observation method, and L0 values are by arranging
It looks into personnel to be obtained according to site environment and exclusion experience, does not make unified value usually.
Compared with prior art, advantageous effect is：Method is mainly by the leakage current survey to low voltage electric network characteristic point
Amount judges that next characteristic point position and leakage point of electricity investigation range, effect are shortening personnel rows according to the value of characteristic point leakage current
The range of leakage point of electricity is looked into, investigation workload is reduced, improves electric leakage treatment effeciency.Positioning for single leakage point of electricity, uses tradition
Method finds leakage point of electricity, and complete low voltage electric network of investigation is needed under extreme case.It, can be effectively conventional earth leakage using above method
Point investigation range foreshortens within L0, and investigation range is substantially reduced.
Description of the drawings
Fig. 1 is overall flow schematic diagram of the present invention.
Fig. 2 is step S01 electric leakages selection of measuring point exemplary plot of the present invention.
Fig. 3 is step S03 electric leakages selection of measuring point exemplary plot of the present invention.
Fig. 4 is step S04 electric leakages selection of measuring point exemplary plot of the present invention.
Fig. 5 is step S05 electric leakages selection of measuring point exemplary plot of the present invention.
Specific implementation mode
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；It is attached in order to more preferably illustrate the present embodiment
Scheme certain components to have omission, zoom in or out, does not represent the size of actual product；To those skilled in the art,
The omitting of some known structures and their instructions in the attached drawings are understandable.Being given for example only property of position relationship described in attached drawing
Illustrate, should not be understood as the limitation to this patent.
As shown in Figs. 1-5, a kind of localization method of low voltage electric network leakage point of electricity, includes the following steps：
S01：In low-voltage circuit position, a measures leakage current value Ia using leakage detector, if measuring for the first time, position a is set as
Low-voltage circuit power supply point position；Judged according to Ia values；When Ia is less than threshold values In, it is determined as position a back segments circuit without electric leakage,
Terminate testing process；When Ia is more than threshold values In, it is determined as that position a back segment circuits have electric leakage；
S02：First line branch point front position b after place on line a measures leakage current value Ib；Sentenced according to Ib values
It is disconnected；When Ib be more than threshold values In, be determined as leakage point of electricity after the b of position；Step 1 and its subsequent step are repeated, to low after the b of position
Crimping road branch line carries out electric leakage point location one by one, and every road branch line starting point is set as new position a at this time；When Ib is less than valve
Value In is determined as leakage point of electricity between position a and position b；
S03：Judged according to the distance between position a and position b L；When position a and position b distances L is less than L0, adopt
Leakage point of electricity is found between position a and position b with conventional method, terminates testing process；When position a and position b distances L are more than
When L0, the leakage current value Im of the intermediate point m between position a and position b is measured；
S04：Judged according to Im values；When Im is more than threshold values In, m is set as new position by judgement leakage point of electricity between m and b
A is set, step 11 and later step are repeated；When Im is less than threshold values In, m is set as new position by judgement leakage point of electricity between a and m
B is set, step 11 and later step are repeated.
Further, the value of the leakage current Ia, Ib, Im are obtained by the leakage detector measurement of low-voltage overhead line road
, specific measurement method includes：It is respectively clamped into using the current sampling device of four tape insulation bars of leakage detector tested
In A, B, C three-phase wire and N phase zero curves in three-phase and four-line low-voltage circuit, the above four road alternating current instantaneous vector values are measured
IA, IB, IC, IN calculate leakage current IL=IA+IB+IC+IN according to Kirchhoff's current law (KCL).
The electric leakage threshold values In is determined according to the leakage detector precision and distribution line field conditions that measure electric leakage.It is excellent
Choosing, the In is set as common 1mA.
Further, the L0 is the range that leakage point of electricity is searched using traditional artificial observation method, and L0 values are by arranging
It looks into personnel to be obtained according to site environment and exclusion experience, does not make unified value usually.
This method is mainly sentenced by the leakage current measurement to low voltage electric network characteristic point according to the value of characteristic point leakage current
Disconnected next characteristic point position and leakage point of electricity investigate range, and effect is the range that shortening personnel investigate leakage point of electricity, reduces investigation work
It measures, improves electric leakage treatment effeciency.Positioning for single leakage point of electricity finds leakage point of electricity, under extreme case using conventional method
Need complete low voltage electric network of investigation.Using above method, effectively conventional earth leakage point investigation range can be foreshortened within L0, arranged
Range is looked into be substantially reduced.
Above method is explained by taking general single radial line as an example, can be as according to actual motion environment and equipment
Make different variations in basis.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
All any modification, equivalent and improvement etc., should be included in the claims in the present invention made by within the spirit and principle of invention
Protection domain within.
Claims (5)
1. a kind of localization method of low voltage electric network leakage point of electricity, which is characterized in that include the following steps：
S01：In low-voltage circuit position, a measures leakage current value Ia using leakage detector, if measuring for the first time, position a is set as
Low-voltage circuit power supply point position；Judged according to Ia values；When Ia is less than threshold values In, it is determined as position a back segments circuit without electric leakage,
Terminate testing process；When Ia is more than threshold values In, it is determined as that position a back segment circuits have electric leakage；
S02：First line branch point front position b after place on line a measures leakage current value Ib；Sentenced according to Ib values
It is disconnected；When Ib be more than threshold values In, be determined as leakage point of electricity after the b of position；Step 1 and its subsequent step are repeated, to low after the b of position
Crimping road branch line carries out electric leakage point location one by one, and every road branch line starting point is set as new position a at this time；When Ib is less than valve
Value In is determined as leakage point of electricity between position a and position b；
S03：Judged according to the distance between position a and position b L；When position a and position b distances L is less than L0, adopt
Leakage point of electricity is found between position a and position b with conventional method, terminates testing process；When position a and position b distances L are more than
When L0, the leakage current value Im of the intermediate point m between position a and position b is measured；
S04：Judged according to Im values；When Im is more than threshold values In, m is set as new position by judgement leakage point of electricity between m and b
A is set, step 11 and later step are repeated；When Im is less than threshold values In, m is set as new position by judgement leakage point of electricity between a and m
B is set, step 11 and later step are repeated.
2. a kind of localization method of low voltage electric network leakage point of electricity according to claim 1, it is characterised in that：The leakage current
The value of Ia, Ib, Im show that specific measurement method includes by the leakage detector measurement of low-voltage overhead line road：Use leakage
The current sampling device of four tape insulation bars of electro-detection instrument is respectively clamped into A, B, C three-phase in tested three-phase and four-line low-voltage circuit
In electric wire and N phase zero curves, above four road alternating current instantaneous vector value IA, IB, IC, the IN are measured, it is fixed according to kirchhoff electric current
Rule, calculates leakage current IL=IA+IB+IC+IN.
3. a kind of localization method of low voltage electric network leakage point of electricity according to claim 2, it is characterised in that：The electric leakage valve
Value In is determined according to the leakage detector precision and distribution line field conditions that measure electric leakage.
4. a kind of localization method of low voltage electric network leakage point of electricity according to claim 3, it is characterised in that：The In settings
For 1mA.
5. a kind of localization method of low voltage electric network leakage point of electricity according to any one of claims 1-4, it is characterised in that：Institute
The L0 stated is the range that leakage point of electricity is searched using traditional artificial observation method, L0 values by investigation officer according to site environment and
Exclusion experience obtains.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711486334.4A CN108303615B (en) | 2017-12-29 | 2017-12-29 | Method for positioning leakage point of low-voltage power grid |
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| CN201711486334.4A CN108303615B (en) | 2017-12-29 | 2017-12-29 | Method for positioning leakage point of low-voltage power grid |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108983027A (en) * | 2018-07-26 | 2018-12-11 | 上海与德科技有限公司 | Electrical leakage detecting method, device, intelligent socket and storage medium |
| CN110441645A (en) * | 2019-08-14 | 2019-11-12 | 南京铁道职业技术学院 | A kind of industrial controlling electrical leakage detecting method and its regulating system |
| CN114184980A (en) * | 2021-12-10 | 2022-03-15 | 国网福建省电力有限公司南平供电公司 | Low-voltage leakage positioning equipment and online leakage evaluation method |
| CN114184981A (en) * | 2021-12-10 | 2022-03-15 | 国网福建省电力有限公司南平供电公司 | Low-voltage electric leakage positioning equipment and offline electric leakage evaluation method |
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| CN103576052A (en) * | 2012-08-02 | 2014-02-12 | 北京人民电器厂有限公司 | System and method for determining direct-current system fault branch circuits needing to be in in-series connection with alternating currents |
| CN103383417A (en) * | 2013-07-24 | 2013-11-06 | 中达电通股份有限公司 | Insulation monitoring method for switching type direct current system |
| CN103439627A (en) * | 2013-09-14 | 2013-12-11 | 株洲中车轨道交通装备有限公司 | Train power supply leakage current detecting system and method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108983027A (en) * | 2018-07-26 | 2018-12-11 | 上海与德科技有限公司 | Electrical leakage detecting method, device, intelligent socket and storage medium |
| CN110441645A (en) * | 2019-08-14 | 2019-11-12 | 南京铁道职业技术学院 | A kind of industrial controlling electrical leakage detecting method and its regulating system |
| CN114184980A (en) * | 2021-12-10 | 2022-03-15 | 国网福建省电力有限公司南平供电公司 | Low-voltage leakage positioning equipment and online leakage evaluation method |
| CN114184981A (en) * | 2021-12-10 | 2022-03-15 | 国网福建省电力有限公司南平供电公司 | Low-voltage electric leakage positioning equipment and offline electric leakage evaluation method |
| CN114184981B (en) * | 2021-12-10 | 2023-12-22 | 国网福建省电力有限公司南平供电公司 | Low-voltage electric leakage positioning equipment and off-line electric leakage assessment method |
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| CN108303615B (en) | 2020-02-04 |
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